Automatic focusing device

[Detailed Description of the Invention]

Use field 1 on [industry This invention relates to the automatic-focusing adjustment which enabled focal regulation also to the photographic subject which moves especially about the automatic-focusing adjustment in a camera.

[conventional technology and its problem 1 If it is in the camera provided with automatic-focusing regulation (Ore) 7 Orcas, following AF, and a brief sketch device, integrating with the photo acceptance unit for performing focus detection first, carrying out the A/D conversion of the data from this element, and inputting it into micro pair Eta -- this micro -- excrement -- pewter smell It is constituted so that the amount of defocusing to the photographic subject of * Taking lens may be calculated. And by driving a photographing lens based on the result of this focal detection operation, it is constituted so that a photographing lens may be moved to the focus position to a photographic subject. Therefore, since predetermined time will be needed by the time a photographing lens reaches the focus state from the time of starting a focal detection operation, a time lag arises. At this time - If the amount of defocusing of the photographing lens to a photographic subject changes with movements of 2 and a photographic subject from a camera, when movement of a photographing lens is completed by the above-mentioned time lag, a focus will shift to a photographic subject. Then, it is necessary to make AF possible also to the photographic subject which moves for example, and the above-mentioned ranging operation and drive control of a lens are repeated, and it is made to amend a lens position according to AF control by JP,60-214325,A in real time. However, the thing once arresting a photographic subject is only discussed here. That is, it is a precondition that it will be in a focus state to the photographic subject which moves, It is not argued how it changes into a focus state quickly to the photographic subject which is moving before describing the control which carries out the flattery drive of the lens so that a focus may be obtained to the photographic subject which moves after that, and reaching a focus state.

[Objects of the Invention] It is made in order that this invention may abolish the problem mentioned above, and it aims at providing the automatic-focusing tone line device which can acquire a focus state at high speed to the photographic subject which moves.

[Elements of the Invention] An automatic-focusing adjustment of this invention, A focus state to a photographic subject which should photo a photographing lens A focus detection means to detect, the amount calculating means of defocusing which computes the amount of defocusing of a photographing lens based on data from; focus detection means, a photographic subject speed transportation device which computes a photographic subject's movement speed based on data from :focus detection means, and the amount calculating means of; defocusing It is based on the calculated amount of defocusing, and movement speed of a photographic subject called for by a photographic subject speed calculating means, It has an anticipated amount calculating means which it is at the end time of an operation about next focal detection, and computes the amount of anticipation defocusing of a lens for a photographing lens to be in a focus state, and drives a photographing lens based on the computed amount of anticipation defocusing.

[example 1 Hereinafter, it explains concretely, referring to a drawing of attachment of an example of the present invention. Drawing 1 shows a block configuration of a camera, left-hand side of straight line A-A' in a figure shows interchangeable lens LZ, and right-hand side shows main part BD of a camera. It can join now together mechanistically with clutch 101,102, and both are by this clutch 101.102, respectively, When interchangeable lens LZ is mounted on main part BD of a camera, lens circuit 103 by the side of interchangeable lens LZ and reading circuit 104 by the side of main part BD of a camera are electrically connected by contact button JLI~JL5.JBI~JB5. At this camera system, an optical system is constituted so that a semi transmission part of a husband in reflective mirror 105 of main part BD of a camera may be passed, it may be reflected by submirror 106 and photographic subject light which passed a lens system of interchangeable lens LZ may be received by CCD series 107 in a focus inspection module. as a focus detection means for this CCD series 107 to measure the amount of defocusing to a photographic subject -- business -- it is that of nu1 Afterwards, and a plurality of charge conversion elements can be arranged in in the shape of an array, and a publicly known thing which took out a signal from each charge conversion element one by one can be used. Interface circuit 108 drives CCD series 107, takes in photographic subject data from CCD series 107, and sends out this taken-in data to controller 109. The amount 1delta1 of defocusing controller 109 indicates the amount of gaps of a lens from a focus position to be based on photographic subject data from CCD series 107, A signal with the defocusing direction which a lens position has shifted ahead, has shifted back, or (back bottle) shows the direction of a gap is computed. Motor Mol is driven based on these signals, and by being transmitted to transmission mechanism 112 via mechanism-slips 110. drive mechanism 111 and clutch 102.101, the rotation makes a lens system of interchangeable lens LZ get mixed up in an optical axis direction, and performs focal regulation. In order to monitor movement magnitude of a lens system at this time, encoder 113 is connected with drive mechanism 111 of main part BD of a camera, and a pulse of a number corresponding to drive quantity of a lens system is outputted from this encoder 113. When torque more than predetermined is added to a passive-movement part of interchangeable lens LZ, power of motor MO1 slips, and as for mechanism slips 110, excessive load is added to motor MO1. Here, it is to lens circuit 103 by the side of [ reading circuit 104 by the side of jar Body to ] an interchangeable lens, A reading start signal with which a power supply makes reading of data start via a clock pulse for a synchronization at the time of data transfer and terminal JB3-JL3 via terminal JB2-JL2 via terminal JB1-JLI is sent out, respectively. Serial data is sent out via terminal JL4-JB4 in reading circuit 104 from lens circuit 103, and terminal JB51-JL5 is a common earthing terminal in a desk. If a reading start signal is sent out to 1 This and lens circuit 103 at first, synchronizing with a clock pulse, reading circuit 104 will be sent out for data of lens circuit 103. Reading circuit 104 changes serial data inputted into parallel data KL based on the same clock pulse as a clock pulse outputted to a terminal and lens circuit 103, and sends them out to controller 109. controller 109 boils the number N of pulses which should calculate the amount 1delta1 of defocusing based on data K of reading circuit 104 from data of a photographic subject image from interchange 7 A Durable circuit 108, and should be detected by encoder 113 -- 1 -- it computes according to the operation of 1delta1. Controller 109 makes a clockwise rotation or a counterclockwise rotation rotate motor N401 through motor driver 114 according to a signal of the defocusing direction for which it asked from data of a photographic subject image. When a pulse equal to the calculated value N is inputted into controller 109 from encoder 113, it judges that a lens system for focal regulation moved only movement magnitude deltad to a focus position, and stops rotation of motor Mol. If a focus suits by such focal regulation, a predetermined signal will be sent out from controller 109 to display circuit 115, and a focus display and a display of distance to a photographic subject will be made. Although outline operation of a camera was explained above next, a control action in controller 109 is explained in detail using Drawing 2. The same numerals are attached about the same portion as Drawing 1. 109 is a microcomputer (it is called a microcomputer below) which makes operation in a Hunt roller mentioned already, and 121 is, While opening and closing a shutter according to a start of exposure, and an end, it is an exposure control circuit which controls by extracting as a mirror rise of reflective mirror 105 according to a mirror rise signal. 122 is a light measurement circuit, Denaltar-izes a signal according to a photographic subject's luminosity, and sends it out to microcomputer 109. 123 is a film sensitivity automatic reading circuit which reads film sensitivity with which it loaded, and read film sensitivity is taken into microcomputer 109. 124 drives motor MO2 with a signal from microcomputer 109, it is a 1 Roll up a piece 1 piece winding-up circuit about a film, 125 is an exposure setting circuit which sets up shutter speed and an iris diaphragm value, and a preset value is taken into microcomputer 109. 107 It is the CCD series which carried out Ha previous statement, and a photographic subject's picture information is taken into microcomputer 109 via interchange 7 Aid circuit 108. 114 is a motor driver who controls motor MO1 for focal regulation, and 113 is an encoder which outputs drive quantity of motor Mol as the number of pulses. 103 and 104 are a lens circuit and a reading circuit, and 115-1 Azo 115-2 is a display circuit which displays distance in a focal detection state and the photographic subject Lord, respectively. Sl is a switch set to ON by the 1st step of pushing of a Release button which is not illustrated, and microcomputer 109 will be in an ON state by ON of this switch S1, and it will perform the below-mentioned AF flow. S2 is a switch set to ON by the 2nd step of pushing of the Release button, and performs 70- of Release of the Yo 1 after-mentioned to ON of this switch S2. It is a switch set to ON by the completion of a mirror rise of S and a Is a reflection mirror, and if churn of the release member which is not illustrated is carried out, it will become switch S and Is OFF. S4 is a photography mode change switch for switching continuation photography mode and 1 piece photography mode, and is a switch which is set to ON at the time of S, Is, and the completion of exposure, and is come by off by 1 piece winding-up completion of a film. A primary side of each of above switch 81~S, is grounded, and the pull-up of the secondary side connected to microcomputer 109 is carried out to voltage V via resistance R, respectively. Next, a control action of a camera by the above-mentioned composition is explained according to 70-chart. By the 1st step of pushing of Release, if switch S1 is set to ON, microcomputer 109 will perform a flow chart shown in Drawing 3. First, various flags are reset at Step S1, and in order to know time in each operation at Step S2, 7 Lee Ranta Yma in microcomputer 109 starts. To and the amount conversion factor of deliveries which expresses movement magnitude of an optical axis direction of a lens to Was granted number of rotations with Step S3 to a focal length of a lens required for AP, a Open aperture value, and a lens from lens circuit 103 through reading circuit 104, Data of data Dk+ for changing into open F value A O6 of a lens, the amount of deliveries of a lens, and an actual distance, etc. is taken into microcomputer 109. At the following step S4, an iris diaphragm value, shutter speed, etc. which were set up are read from exposure setting circuit 125, and AF operation which makes a lens drive to a focus position by focus detection operation which is mentioned below, and this operation result is performed at the following step S5. In Step S6, a light measurement result by light measurement circuit 122 is taken in, and film sensitivity is taken in by film sensitivity reading circuit 123 at Step S7. In Step S8, after an exposure operation for exposure is performed by the above input data, it returns to Step S3 and makes loop operation by it. Drawing 4 shows a routine of AFi of 11 works in the above-mentioned step S5. First, integration of photographic subject light is performed by CCD series 107 via interface circuit 108 at Step 3401. Data of a photographic subject which integrated the following step 5402 to CCD series 107 is extracted for every pixel (this operation is called data dumping), and it is taken into microcomputer 109 after an A/D conversion is carried out in interface circuit 108. In Step 5403, an operation of focus detection by the photographic subject's data being also is performed. Since detailed explanation with an optical system as which photographic subject light is inputted, and a focus detection operation is unnecessary here, it omits, but it is described by JP,59-126517,A in detail. In the following step 5404, a useless preliminary operation of imitation amendment is performed so that it may mention below. In Step 5405, the amount of defocusing and its direction calculate with data from the CCD series 107, and a judgment of whether detection of the amount of defocusing is possible is made from the operation result. A photographic subject image is fading greatly, or if it is the Rochon trust, it will progress to Step 5406 as detection being impossible. In Step 5406, when focal detection is impossible, in order to look for a portion in which focal detection is possible, it is judged whether operation (it is this below a Lohung scan and A callJr:) to which a lens is moved was completed. When the Rochon scan is not performed, a Lohung scan is started at Step 5407. And if focal detection is impossible in addition even if this Rochon scan is repeated and a Lohung scan is completed, a blink display focal detection indicates an impossible purport to be to display circuit 115-1 at Step 8408 will be performed, and a return will be carried out to Step S6 in Drawing 3 after that. - A way, Step 5405! If judged with detection of Trowel and the amount of defocusing being possible, Lens drive quantity ERR (pulse count unit) calculates to the amount conversion factors of lens deliveries which are among the lens data taken in at the amount DF of defocusing computed by progressing to Step 5409, and Step S3 of Drawing 3. ERR=DF X K If that judgment which a lens is stopping at Step 5410 is made and it is under stop, If it is judged whether a lens is in a focus state at Step 5411 and a lens is in a focus position, after a focus display is made at Step 5412 in display circuit 115-1, a return will be carried out to 70- of Drawing 3, and it will progress to Step s6. - If a way and a lens do not focus, it will progress to Step 5413, and the defocusing direction for which it asked by this routine execution, If it was judged whether it is the defocusing direction and a counter direction which were called for in the last routine execution and the defocusing direction is reversed, If the lens drive direction which the amount of lens drive system Tsubatsu crash which causes an error at the time of lens drive reversal is amended, and he follows to Step 5424 is the direction, If it progresses to Step 5414, a judgment of whether there is any necessity for AF drive mode which carries out the below-mentioned imitation amendment is made and it is judged with imitation amendment mode, drive quantity of a lens will be amended as imitation amendment at Step 5415. At the following step 8416, a focus judging at the time of imitation mode is made, and if a focus state is judged here, it will progress to Step 5424, after focus expressing as Step 5417. On the other hand, if it is during a drive of a lens at Step 5410, it will progress to Step 5421, The defocusing direction also containing an amended part in Step 5415 called for this time is compared with the defocusing direction to last time, and if judged with a direction being reversed, a return will be carried out after a drive of a lens is stopped at Step 5423. It is because the reliability of a focal detection result will become low if a focal detection operation is done while moving a Holding on lens, although it also became [ the defocusing direction ] opposite to suspend a lens here. It progresses to Step 5422, a judgment of whether the same imitation amendment as the step 5414 is required is made, if the defocusing direction is not reversed, when imitation amendment is required, it progresses to Step 5415, but when unnecessary, it progresses to Step 5424. If it is judged with the calculated amount of Te ° focuses in Step 5424 whether a lens is Near zone near the focus and it is not Near zone, It is set so that a lens may drive at high speed by Step 5425, and if it is Near -/-A, it will be set so that a lens may drive at low speed at Step 8426. And at Step 5427, after a lens drives at set drive speed, a return is carried out, and a focus operation is performed henceforth [ Step S6 ]. Drawing 5 describes step 83~S6 in Drawing 3 in more detail, in order to explain imitation amendment. Time TMI of a free-run timer at the time of an integration start of CCD series 107 is read at Step 5501, and count value T1 of event counter EVTCNT for controlling lens drive quantity at the time of this integration start is read in Step 5502. Integration of CCD series 107 is performed at Step 5503. Integration finish time TM2 of CCD series 107 is read in 71 no-run timer at Step 5504, and count value T2 of event counter EVTCNT at this time is read at Step 5505. Then, at Step 5506.5507, as mentioned already, data dumping and a focus detection operation of CCD series 107 are performed. Okay. is spent for the above-mentioned step 3501~'s5507 accumulating, and being alike among time which this routine execution takes. Value MI of event counter EVTCNT for a lens drive in an integration central point that AF Sill-A was called for by execution is memorized by register R so that it may mention below, In Step 8508, event count value M I memorized by this register R is memorized as M I L by register R * which memorizes the last operation value. In Step 5509, time TMI in an integration central point is similarly memorized as TMIL by register which memorizes the last operation value. In Step 5510, the count value (T1+T2) / 2 which becomes an integration central point from count values TI and T2 of event counter EVTCNT at the time of an integration start obtained by this routine execution and an end of integration are computed, and register R newly memorizes as MI. In Step 5511, similarly, the time (TMI+TM2)/2 in an integration central point are computed from time T M 1 * T M 2 at the time of an integration start and an end of integration, and a register memorizes. In the following step, although lens drive quantity between these integration centers is computed from the last integration center, this calculation is explained using Drawing 14. A horizontal axis is time and let the vertical axis be a value of event counter EVTCNT. T1. and T12 are the count values of event counter EVTCNT in TMIIITMI□ at the time of integration 1 and a start of I2, respectively, T21 *T22 is integration finish time TM2, respectively.. It is a count value of event counter EVTCNT of TM2□, and T 3 and T 3□ is a count value of event counter EVTCNT of operation C made after the integration, C2 finish time TM3., and TM3□, respectively. MI L and M I are the count values of an integration central point searched for from T1., T 2 and T 12, and T22, respectively. Here, they are T M 3 and = T M 1□. A value of event counter EVTCNT memorized by registers R and R', Count value T3 of event counter [ in / it is rewritten at the time of each end of an operation, and / finish time TM3□ of operation C2 ] EVTCNT .. l This, While event count value M I is memorized by register R, event count value MIL acquired by last operation C1 is memorized by register R *. This event count value is a value which changed into movement magnitude of Encog the amount of defocusing calculated by an operation, and shows a position which shows the amount of defocusing from a photographic subject image side in each integration central point. However, as shown in Drawing 14, when operation C1 is completed and integration ■2 of next time begins, discontinuity arises in an event count value. This is for rewriting an event count value by a focal detection result of integration by time TM3., and is based on a focal detection error. M A value of I L-M I will not show movement magnitude of an exact lens in integration 1 cycle. If a gap of this discontinuous part is set to DT, this value DT will be given by difference 5ERR-73 of value 5ERR by which an operation result was set to Encog as a moving number of a lens, and value T3 (2 T3I) of event counter EvTCNT in which a lens position at this time is shown at the time of an end of operation C3. From This hl This, movement magnitude IT■ of a lens within focal detection time of one cycle is obtained by deducting a value (!FI-DT) which subtracted Ml by above DT from above MIL. That is, it becomes I T J =M I L- (M I -DT). After an operation of above DT and ITI is performed in step 5S12-5513, value T3 of event counter EVTCNT at the time of this end of an operation is read at Step 5514. And time TM3 at the time of an end of an operation is read at Step 5515, and it progresses to Step S7 in Drawing 3 after that. Now, Drawings 6 and 7 are the flows which described a flow after a judgment under a lens stop in Step 5410 of the Drawing 4, and drive in detail. Drawing 6 shows 70-chart in a case of lens being under stop, and this mode is performed at the time at a time of performing a flow first, and the time of a focus check or a focus. In order that lens drive quantity ERR which it was judged, it progressed to Step 5602 when it was in a focus zone whether a lens is in a predetermined focus zone at present at Step 5601, and was calculated this time may use it at the time of next amendment, lens drive set value EVTCNT which was set as last lens drive quantity LERR, and was calculated this time -- the same -- 5EER -- a set -- h To. It is a focus display so that the defocusing direction called for at Step 5603 this time may be similarly rewritten with the last result and it may mention below at Step 5604, A display (it mentions below in detail) of distance to a photographic subject is made in display circuit 115-2, a return is carried out to Step S6 of Drawing 3 after that, and focus detection is repeated again. - If judged with outside of a focus zone at a way and Step 5601, it will progress to Step 5605, and if execution of the flow is the execution which the 1st time is judged and is the 1st time, it will progress to Step 3606 and an imitation flag will be reset. This imitation flag is used for a judgment of whether to go into imitation mode which performs amendment for improvement in conformity of focus detection. And a renewal flag of un-which forbids renewal of a count value of event counter EVTCNT at Step 5607 is reset, and an imitation amendment flag which makes an operation result obtained at the following step 5608 at the time of imitation mode amend one by one is reset by 0. At the time of next 70-execution, it progresses to step 5610.S611-5612 from Step 5605, and the last defocusing direction by an operation result and this defocusing direction are compared. If a direction is reversed, at Step 5613, a backlash of a lens drive system will be amended, it will progress to Step 3606 after that, and an imitation flag will be reset as initial setting. If this is in imitation mode, it means escaping from this mode. - If a way and the defocusing direction are the directions, it will progress to Step 5614 and a photographic subject's movement magnitude WR will be computed. Drawing 15 explains this calculating method. A vertical axis shows a focal position of a lens and a horizontal axis shows time. A in a figure shows a photographic subject which moves, B shows a lens driven so that the photographic subject may be followed, and a mutual distance interval in a simultaneous point shows the amount of defocusing. Amount DFc Have been determined [ in / it is in TM3 a time of operation C1 being completed now, and movement FVR of a photographic subject for one cycle between integration central points TMIL and TMI of integration ■2 / last / and this integration ■ can already be found, and / central point TMI of integration I, ] of defocusing. An equivalent of a lens at this time serves as LERR and ERR, respectively. The arising amount WR of defocusing make between central point TMIL of integration I2 and central points TMI of integration I, into one cycle, and according to movement of a photographic subject to this Open is WR=ERR 10 ITI-LERR from a figure. It asks by carrying out. ITI is the movement magnitude of a lens in this Open. A state of an imitation flag is judged at the following step 5615. going up to the 1st execution of this flow, as mentioned already if operation is explained according to a flow of this flow -- an imitation flag -- Lisez -- it is judged by that of h ing here where it progresses to Step 8616 from Step 5615 this time whether the photographic subject's movement magnitude WR is beyond predetermined value AB. In predetermined value AB described here, even if it does not carry out imitation amendment in consideration of width of a part for variation or a focus zone of an operation result, a range it is considered that is a focus zone is said. Although this predetermined value AB is good also as a fixed value, it may be made to change corresponding to focal detection time of one cycle, as shown below. When this is explained, since it changes with integration time, one cycle of a motion of a photographic subject is AB=AB and X (TMIL-TMI). It may express by carrying out. AB, Is a constant, and TMIL-TMI are the values calculated at Step 5508*5510 in Drawing 5, and TMIL-TMI is the time of one cycle from an integration center to the next integration center. Since WR/(TMrL-TMI) is inclination of a motion of a photographic subject, it is exactly having taken a value of a denominator into AB. now, a photographic subject's movement magnitude WR -- less than predetermined value AB -- be -- although it progresses to Ho step 5607, when movement magnitude WR is beyond the predetermined value AB, after being set to an imitation 7 Ragga bow at Step 5617, it progresses to Step 5607. Since imitation mode is set up with the set of an imitation flag at the time of 70-execution of next time in this case, it progresses to 8618 through Step 5601-5614.5615. A photographic subject's movement magnitude WR is measured with the predetermined value AB like Step 8616, if a photographic subject's movement magnitude WR is less than predetermined value AB, imitation amendment will progress to Step 5607 here, without being carried out, but when movement magnitude WR is more than predetermined value A8, it progresses to Step 5619. Here, the photographic subject's movement magnitude WR is measured with another, quite larger predetermined value AX than the predetermined value AB, if movement magnitude WR is less than AX, a renewal flag of un-will be reset at Step 5621, and an imitation amendment flag will be set at the following step 5622. On the other hand, when a photographic subject's movement magnitude WR is more than AX, at Step 5623, a renewal flag of un-is set, after that, it progresses to Step 8608 and an imitation amendment flag is reset. This 70- is a time of a photographic subject's movement magnitude WR carrying out large To hurt change, when direction of a camera changes into imitation mode, In this case, a counter value of updating To 8 Last time last time is left behind as it is, imitation amendment is also forbidden, AF control is made as it is also at the last count value, and for this reason, as for imitation amendment, the Iben Y counter EVTCNT is forbidden. Since a value which changed a lot is replaced as lens drive quantity LERR at the time of next 70-execution, Since a photographic subject's movement magnitude WR will not change a lot shortly if direction of a camera has changed at this time, it progresses to Step 5621-5622, and a renewal flag of un-is reset, and an imitation amendment flag is set. Thus, when the amount of defocusing changes a lot, an operation result at this time should be disregarded once, and AP-sub-control-do to Chi by the last data -- To -- if it is like and direction of a camera has changed also after that AP-sub-control-do to being also at lens drive quantity LERR which the above is large and changed henceforth by a photographic subject's movement magnitude WR becoming in less than AX, and progressing to Step 5621 shortly, -- To. After Step 8608 and step 5622, it progresses to Step 5624, this lens drive quantity ERR is replaced as last data LERR, and the defocusing direction called for this time is replaced as last direction at Step 5625. And if an imitation amendment flag is judged at Step 8626 and an imitation amendment flag is set to 1, calculation of imitation amendment explained in full detail at Step 5627 later will be made, and a value of lens drive quantity ERR will be amended. Therefore, in Step 5624, lens drive quantity ERR which has not carried out imitation amendment is memorized by last lens drive quantity LERR. Next, it is if that judgment which has come in the below-mentioned imitation focus zone at Step 5629 if set to an imitation 7 Ragga bow at Step 5628 is made and it has come in a focus zone, A focus display and a distance display are made at Step 5630, and it progresses to Step 5424 in Drawing 4 after that. - The above-mentioned imitation focus zone which he will follow to Step 5424 at Step 5629 if it is outside a focus zone when an imitation flag is reset at a way and Step 5628, Although it may not enter in a focus zone at the present end time of an operation, a zone which an effect of imitation amendment shows up in timing of this point, and becomes in a focus zone is said, and a focus display is made even if it is during a drive of a lens in this case. Drawing 8 writes the contents of calculation of imitation amendment in the above-mentioned step 5627 in detail, and illustrates this correcting method using Drawing 15. it is in TM3 a time of Act SFC, being completed now, and mentioned already -- as -- integration central point T~IIL of last integration I2 and this integration I3, Movement magnitude WR of a photographic subject for one cycle between TMI(s) can already be found, and defocusing fiDFc in central point TMI of integration ■, can be found. However, it is since a photographic subject has already moved since time TM I which calculated the amount DFc of defocusing in this time TM3 and a photographic subject moves further during a drive of a lens in next (7M3), It becomes meaningless even if it drives a lens by the amount DEc of defocusing by TM3 at this time. Then, next integration I and Act WC. Amending for the purpose of TM3' a time of the new amount DFd of defocusing being computed by End(ing) can call it efficient suitable amendment. For this reason, a photographic subject's amount X of relative displacement will be amended [ the ] between T M 3' from TMI at the time a time of being the actual amount DFc of defocusing. a time -- TMI from TMIL -- it can set -- a photographic subject -- inclination a which shows a photographic subject's movement speed in during this period if movement magnitude is set to WR 11R TMIL-THI Since come out and it is, it is the movement magnitude of a photographic subject from point in time TMI to time T M 3, If time TM3 to T M 3' carries out nearsightedness to 7M3-TM3'=TMIL-TMI, it will be the movement magnitude of a photographic subject in the meantime, Movement magnitude X of this called-for photographic subject is amended as WR at Step 5627-1, and at the following step 5627-2, as for movement magnitude X of a photographic subject in point in time TMI to a next door and the time TM3" Lord, lens drive quantity ERR is amended as it is also at this amendment value WR. Here, although a case where a lens catches up to a photographic subject which is moving is discussed, even if it is a case so that a photographic subject may go in the move direction of a lens, the same control as Above is made. That is, in this example, the amount DF of defocusing computed is expressed like a lower type. DF=DF1+DF2-4TI = DF 1 + (v+-v2) -- however, the amount of defocusing of a photographing lens at the integration central time of integration performed before a DFI:focal detection operation here, DF2: Movement magnitude of a photographic subject on a focal plane of a photographing lens until a focal detection operation is completed from an integration central time, ITI: Movement magnitude of a photographing lens on a focal plane of a photographing lens until a focal detection operation is completed from an integration central time, vl: A photographic subject's movement speed, v2: Movement Speed of Photographing Lens, t: come out time until a focal detection operation is completed from an integration central time. Drawing 9 shows a display routine of Steps 5604 and 5630 in Drawing 6. What a rise count is carried out at the time of a delivery of a photographing lens, and a pulse from an encoder is rounded in the above-mentioned example, and is sometimes done for a down count, It is constituted so that a pulse count value according to the amount of deliveries of a lens may be acquired, and this count value is stored in a counter (LNSC). A count value by lens delivery 1 absolute counter LNSC for which it asked as mentioned above at Step 5901, and an aggregate value with drive quantity ERR of a lens are set to distance counter DSCN. This lens delivery 1 absolute counter LNSC is set to O when a lens is in ■ position, it is a counter counted in proportion to the amount of deliveries of a lens, therefore a count value corresponding to distance to a photographic subject is inputted into distance counter DSCH. A count value by the distance counter DSCN and distance conversion data Dk+ peculiar to a lens inputted from a lens are multiplied by Step 5902, and it is changed into data called parameter DSPS for a display. Although this data is not distance data, when this is sent out by device for a display, it becomes distance display data and a display of distance is made at Step 5903. It returns to Drawing 4 again and explains operation at the time of being judged with under a drive of a lens at Step 5410 in full detail with Drawing 7. In STELLA 7'3701~5703, if the drive direction of a lens is compared with the De 7 Ouka ON direction after movement magnitude amendment and a direction is reversed, it will progress to Step 5704 and an imitation flag will be reset. Since a lens caught up with a photographic subject during imitation operation and this meaning was passed as it was, it has canceled imitation mode. After a drive of a lens is stopped at the following step 5705, a return is carried out to Step S6 of Drawing 3, and a ranging operation is made again. - when the drive direction of last time [ direction / a way and / of a lens / drive ] was the same, it progressed to Step 8706 and a photographic subject's movement magnitude WR mentioned already -- as At zero-order step 8707 called for by ERR+I T I-LERR, But in imitation mode is judged by judgment of a flag, if it is among imitation mode, it will progress to Step 3708~5714, but since this portion is the same as Step 5618 or subsequent ones in the mode during a stop of Drawing 6, explanation is omitted. - When it is not in a way and imitation mode, it progresses to Step 5715, and predetermined value AA whose amount WR of move defocusing of a photographic subject is a little smaller than the predetermined value AB, and thick I are judged, If it progresses to Step 5712.S?14, a renewal flag of un-and an imitation amendment flag are reset and a method of - and a photographic subject's amount WR of move defocusing are beyond predetermined value AA, when small, An imitation flag is set at Step 8716 and reset of a renewal flag of un-and a set of an imitation amendment flag are made at Step 5711-5713 after that. This part is a different point during a stop from the mode, and during lens movement, in the mode, since high-speed control is required, an imitation amendment flag is set so that imitation amendment may be carried out immediately. It progresses to Step 5624 of Drawing 6 after Step 5713 and Step S?14. Drawing 10 writes Step 8424~5427 in Drawing 4 in detail. If a state of a renewal flag of un-is first judged at Step 51001 and a flag is reset, It progresses to Step 51002 and it is judged now whether it is during a drive of a lens, If it is under drive, at Step 51003, lens movement magnitude CTC (=MI-T3) from a photographic subject data taking-in-point in time to an end of an operation will be computed, and drive quantity ERR of a lens will be amended by Step 51004. That is, amendment of lens movement magnitude CTC used as a count error of a time of data input and a time of the ability of an end result of an operation to be found is performed, and it progresses to step 5ioos after that. If a lens is not driving [ be / it ], the step 51002.81003 will be skipped. Although drive count value ERR of a lens is contained in Near zone NZC at Step 51005, But is judged how, If it is in Near zone NZC, in order to raise focus accuracy at Step 51006, a drive of a lens is set to low speed, and newly calculated lens drive count value ERR is set to event counter EVTCNT. - If it is outside a way and the Near zone NZC, at Step 51007, high speed will be set and lens drive count value ERR will be set to event counter EVTCNT. In Step 31008, a count value of event counter E V T CNT is set as lens drive quantity 5ERR for offset calculation of the next event count. The following step sio. After energizing on a motor for AF drive in 9, a return is carried out to Step S6 of Drawing 3. Drawing 11 shows a interruption routine for controlling lens drive quantity, and whenever a pulse is outputted from an encoder with rotation of a motor, it performs this routine. first, step Sl 101 shows lens drive quantity -- event count value Power bow subtraction is carried out. In step 5lit2, if it is judged whether the event count value was set to O, and a drive of target lens drive quantity was completed and it is set to 0, the motor will be suspended at Step 51103 and a return will be carried out after that. A focus display will be made if an operation result after a return and under stop is in a focus zone. Drawing 12 shows a interruption routine which occurs during execution of AP routine of Drawing 3 when switch S2 is set to ON by pushing of Release. When it is judged whether it is in imitation mode with STELLA 7'51201 and an imitation flag is set, calculation of imitation amendment of lens drive quantity is made at Step 51202, and a lens drives based on these correction results to an exposure start. This amendment amends a part for a photographic subject to move also into a release time lag to an exposure start to event counter EVTCNT, after a Release signal enters. When an imitation amendment flag is reset, a drive of a lens is stopped at Step 51203. Although in inside of imitation mode this is controlled at low speed since a lens is approaching a photographic subject comparatively, Since short time will be taken and delay about a release time lag will arise at the maximum by the time it stops completely, even if it takes out a signal which is not in imitation mode and which stops a lens in profit with high speed, and this case if it is usually in the mode, a lens is stopped unless it is in imitation mode. Uni explains imitation amendment calculation in Release in the step 51202 using Drawing 13. In Step 51301, RT is Carelise time lag time peculiar to a camera, and is a - constant value. WR/(TMTL TMI) is the amount of defocusing by which a photographic subject of unit time this t This runs, Therefore, WR/(TMI L-TMI) and RT express the amount of imitation delay in a release time lag, In zero-order step 51302 which makes this value a photographic subject's amount WR of move defocusing, the calculated amount WR of defocusing is added and amended by faucet F value of the Iben counter EVTCNT. Now, it returns to Drawing 12 and a display which shows a focus state at Step 81204 is turned OFF. Then, a rise of reflective mirror 105 is started at Step 512O5, at the following step 81206, it extracts via exposure control circuit 121, and control is performed. At Step 51207, if it is judged whether a rise of the reflective mirror 105 was completed and it is completed, it will progress to Step 31208 and a drive of a lens will be stopped. Thus, a lens drive is continued in imitation mode until reflective mirror 105 goes up (i.e., until exposure is started). It is judged whether exposure was started at Step 51209 and ON and 1 exposure were completed by switch S5 at the following step 51210. If exposure is completed, a self-winding raising of a film will be started with switch 1211, and the reflective mirror 105 will descend at Step 51212 continuously. At Step 51212, it is switch S. If a judgment of how is made by The state and Shot mode is a continuous shooting mode, it will return to Step S3 in Drawing 3, and the same control as the following will be made. - If it is in a way and single copy mode, it will progress to a loop which repeats only light measurement of Steps 51214 and 51215, and will wait to carry out following Release operation or switch S1 Ore 7. As explained above, the amount of defocusing accompanying movement of a photographic subject in an end time of an operation of 1 This and next focus detection is calculated, and only the calculated amount of defocusing is as a target of imitation amendment of this end time of an operation having made it make a lens drive. Thus, in order to point-read a photographic subject's movement magnitude in operation 1 cycle, to carry out it and to amend it, efficient suitable amendment is made. Since a next operation result is obtained when a lens drive for amendment is completed, and the amount of defocusing of a lens is amendment, when an error serves as the maximum even when an error is after a lens drive, and it is updated, there is no possibility that accuracy of AF may fall. Next, the 2nd example of the present invention is described using Drawing 16. It controls by an example of this !jS2 to switch two sorts of driving speed which is [ what / has fixed driving speed of a lens ] mutually different in a lens in the 1st example mentioned above, and to drive. In this example, it is constituted so that lens driving speed may be switched according to size of drive quantity taken for a lens to arrive at a focus position, If the remaining lens movement magnitude is larger than the specified quantity within Near zone, lens driving speed will serve as LSD, and if it is below the specified quantity, lens driving speed will be set to LSD2 [ more nearly high-speed than LSD ]. Here, although a change of lens driving speed is controlled independently with imitation mode, if lens driving speed is set to LSD2 into imitation mode, a lens will be driven by driving speed LSD2 until movement of a focus position of a photographing lens catches up with movement of a photographic subject. That is, when imitation amendment is calculated and drive quantity of a lens is calculated, drive quantity ERR is NZC2 (here, since it became larger than NZC>NZC2>, lens driving speed is switched to LSD2 by the side of a high speed from LSD by the side of a low speed, and imitation is begun.). a case where it will not catch up with movement of a photographic subject by this if a lens is driven by driving speed LSD -- Yo 1 -- it can catch up with the photographic subject by driving a lens by quick driving speed LSD2. In Drawing 16, size distinction with drive quantity ERR and NZC2 is carried out at Step 51601. Here, if it becomes ERR>NZC2, it will progress to Step 51602 and will set lens driving speed to LSD2 by the side of a high speed. And in step Sl 603, although an imitation flag (imitation F) is set, it distinguishes whether it is no and inside of imitation mode distinguishes no. If it is among imitation mode (imitation F-1), it will progress to Step 31605, a speed lock flag (speed lock F) is set, and if it is not among imitation mode (imitation F= 0), it will progress to Step 51604 and will reset a speed lock flag. This is for making it not return to driving speed LSD by the side of a low speed again, even if lens drive quantity ERR becomes large into imitation mode, once it is set to driving speed LSD2. And from Step 51604 or 51605, it progresses to Step 51608, and drive quantity ERR is set to event counter EVTCNT, and it progresses to Step 51008. If lens drive quantity decreases in the following focal detection operation cycle and it is set to ERR<=NZC2, It progresses to Step 51606 from Step 51601, and it is distinguished whether a speed lock flag is set at Step 81606, If this speed lock 7 lug is set, it progresses to Step 81608 with the present lens driving speed and a speed lock flag is not set conversely, it progresses to Step 51607, and lens driving speed is switched to LSD by the side of a low speed, and it progresses to Step 81608. A graph and 70 Drawings 17 and 18 indicate operation of the 3rd example of the present invention to be - It is CheerF. after going into imitation mode in this 3rd example -- a lens -- when a photographic subject separates from a focus position, lens driving speed is switched to LSD2 by the side of a high speed from LSD by the side of a low speed, lens driving speed is raised, and imitation performance is raised. Drawing 17 is a graph which shows change of pin 1 position of a photographing lens when a photographic subject has been approaching to a camera like Drawing 15. In Drawing 17, it is at the ActW and end time of C6, and suppose that it became imitation mode. Then, although a drive of a photographing lens by imitation mode comes to be controlled from integration I6, if it is judged that movement of a focus position of a photographing lens does not catch up with movement of a photographic subject according to operation C7, lens driving speed will be switched to LSD2 by the side of a high speed from LSI by the side of a low speed. Then, even when movement of a focus position does not catch up with movement of a photographic subject like dotted line illustration by lens driving speed continuing being LSD by the side of a low speed, it can catch up like solid line illustration by switching this to LSD2 by the side of a high speed. Operation in this case is explained using Drawing 18. Drawing 18 changes Step 51006 of Drawing 10. First, at Step 51801, it distinguishes whether an imitation flag (imitation F) is set, and it is investigated whether it is imitation mode. And it is if an imitation flag is not set and it does not go into imitation mode, It progresses to Step 81802 and sets lens driving speed to LSD by the side of a low speed, A 1st imitation flag (imitation 1timeF) which shows that it is in 1st imitation mode at Step 31803 is reset, After resetting a speed lock flag at Step 51807, event counter EVTCNTi Nice of the drive 1ERR is carried out at Step 51808, and it progresses to Step 31008. On the contrary, at Step 51801, an imitation flag is set, and if it is in imitation mode, it will be distinguished whether it progresses to Step 31804 and a 1st imitation flag is set. And if this 1st imitation flag is not set, it progresses to Step 31805, and lens driving speed is set to LSD by the side of a low speed, a 1st imitation flag is set at Step 51806, and it progresses to Step 81807. into imitation mode, a lens follows a photographic subject in footsteps by lens Drive speed 7iLSD by the side of a low speed -- Listen -- a case where it has increased conversely without the amount of To deal defocusing decreasing It progresses to Step 81809 from Step 51801.51804, and compares this drive quantity ERR with drive quantity 5ERR set to event counter EVTCNT last time. And it is since imitation Moh Y% Roughly also serves as ERR>SERR when a focus position of a lens does not approach a photographic subject, It progresses to Step 81810 at this time, and after setting lens driving speed to LSD2 by the side of a high speed and setting a speed lock flag at Step 51811, it progresses to Step 81808. Step 51811 is a useless step which drives a lens by this driving speed LSD2 until a focus position of a lens will catch up with a photographic subject, once lens driving speed is switched to LSD2 by the side of a high speed. When a focus position of a lens is approaching a photographic subject in the following focal detection operation cycle, since it is set to ERR<=5ERR at Step 31809, it progresses to Step 51812 and a speed lock flag is set, but non-But is distinguished. Here, if a speed lock flag is set, it will progress to Step 81810 and lens driving speed will serve as as [ LSD2 by the side of a high speed ], If a step S lock flag is not set, after progressing to Step 51813 and setting lens driving speed to LSD by the side of a low speed, it progresses to Step 31808. Since a change of this lens driving speed does not have countable influence to imitation amendment, it is not necessary to add amendment for Supplement to that imitation amendment further especially with a change of lens driving speed. In the above-mentioned example, it was constituted so that lens driving speed might be switched to two steps, but it cannot be overemphasized that it is not limited to this and lens driving speed may be switched more than a three-stage.

Effect 1 of [invention Since the amount of defocusing accompanying movement of a photographic subject in an end time of an operation of next focus detection is calculated and it was made only for the calculated amount of defocusing to make a lens drive as a target of imitation amendment of this end time of an operation in this invention, Efficient suitable amendment is made and a focus state can be acquired in a short time.

[Brief Description of the Drawings]

Drawings 1 are a figure showing one example of the block configuration of the camera to which the automatic-focusing adjustment of this invention is applied, and Drawing 2, The block diagram and Drawings 3 or 13 showing the control circuit in Drawing 1, The flow chart and Drawings 14 and 15 showing the control action in Drawing 1, A figure for the flow chart and Drawing 17 in which the figure used in order to explain a control action plainly, and Drawing 16 show the control action of the 2nd example of this invention to illustrate the 3rd example of this invention, and Drawing 18 are flow charts which show the control action of the 3rd example of this invention. 101.102 ... clutch, 103 ... lens circuit, 104 ... reading circuit, 105 ... reflective mirror, 107 ... CCD series, 108 ... interface circuit, 109 ... a micro -- excrement -- Pewter and 110 ... mechanism slips and 111 ... drive mechanism, 112 ... transmission mechanism, 113 ... encoder, 114 ... motor driver, 115 ... display circuit, 121 ... exposure control circuit, 122 ... light measurement circuit, 124 ... - piece winding-up circuit, 125 ... an exposure setting circuit, MOl, and MO2 ... Motor, S, and -S5 ... Switch. Applicant for a patent Minolta Camera Co., Ltd. representative Patent attorney Pale white Two-person figure 1 8 outside A -- A 1 11?X and 4 - -The 8-L old Sacrifice 5i From Procedure amendment letter August 14, Showa 61