Objective for recording and reproducing optical information

[Detailed Description of the Invention]

The object of an invention (The use field on the 1!M east) This invention relates to optical disc Register and the object lens for playback, and the thing as for which an account wholesales with the light of Q A nose on the other hand and that performs Prostitution with the light of the wavelength of another side using the light of the wavelength of 2 Theory especially. (Conventional technology) After the object lens for former disks secures desired test working distance to a Scold sake for the drive Q load of a lens, it is amount of deafness psi small size as much as possible, and its thing cheap moreover is desirable, as generally known well. JP,58-72114,A is known as a lens devised for such the object. @ accomplish this lens from four lenses, and its lens full length is also long -- 1 wrinkles minor type -- a large elder brother -- there is also nothing -- there was a problem that many mouths which were ■, and numbers of 111 Formation sheets were by si% A spider. In recent years, the art of manufacturing an aspheric surface lens progresses and the sequence which carried out the real theory of the object lens for former disk playback with the Aspheric surface lens using mold glass is Wrestling(ed) by mold glass. (APP40pt, VOI, 22N116F, and 2413~2415) Since a spherical aberration can be easily amended by aspheric-surface-izing a Bending ?T side like the above-mentioned sequence again (1983), the sequence which reduced the composition number of sheets of the lens using this is also known. it carried out and accomplished, and conventionally, many of object lenses for optical discs have been developed in order to differ from the object for record, or the object for playback -- a sake -- general -- a chromatic aberration -- Hit in amendment -- it is not divided but the above-mentioned publicly known sequence is also a thing only for Hikaru Isshiki. Even if it records on one wavelength and tries to perform Prostitution on Bamboo grass and a method of pond ■ wavelength using the laser beam of the wavelength of 2 Yuzu using such an object lens, it is impossible to carry out former to ' in the same focal position. For this reason, slightly, by making one side or meat 10,000V wavelength ■ people A origin into emission but Is convergent light to spread, as spot A used rt Scope right, it was carrying out the object for facilities to it. however, focusing control 141 t'J h [ as opposed to / since it will shift in the focal position to the light of the wavelength of 2 yuzu citron - if an object lens is moved in the direction of a primary shaft to this Force stile and disk LD side deflection / disk 7■ deflection ] -- the range [ 15 ] is limited and a problem is rash practically. (Hazama point which an invention tends to solve) in order to flint fire the above-mentioned upsilon problem -- VC -- an object lens -- color rl'i L -- rubbing -- it is good. However, when one Well lens tends to amend a Paraxial axis top chromatic aberration like this invention, junction-oriented curvature becomes very strong and it is large caliber-ized '4r! It becomes [ carrying out or ] difficult. If bonded surface 0 curvature is made as much as possible into the method of a little dog comb in order to consider it as a large caliber, 8 Wisdom which use the very large thing of an Abbe number for the right lens to join, and use the very small thing of an Abbe number for a negative lens will arise, and will receive large restriction in the department of lens '@' which carries out the object for facilities. as opposed to the light which considers it as a large caliber and in which fc:lI&1 go is large as for an opening needle even if it carries out Extraction pressure of the Paraxial axis top chromatic aberration, while the bonded surface has been [ History ] a surface of a sphere -- wavelength 7 -- Pig iron -- the difference of the spherical aberration of light flux is large, and while saying that it does not mean that VC carried out Extraction pressure of the fine earth chromatic aberration, there is actually Zhao. Material ground of an invention (Means for A vote(ing) a problem) This invention V object lens is a junction lens consisting of both the convex lenses by the side of an object, and the negative lens pasted together to that Is side, and the point made into those for That Q Swallowing surface meeting ball is Q% of Gorge size Trace. And when it of nupd and a negative lens is set to nund for the Abbe number in d line of both convex lenses, it is 10<To d-nu nd. ...... It is required to fill (1). Further rl: Peak curvature half A np of the field by the side of the object of a positive lens: The refractive index of a positive lens f: The focal length of yarn doubling ■ fulfilling conditions -- A -- better -- There. History -- right lens upsilon refraction \np satisfying The just -- the side -- better -- There. For <rp above-mentioned upsilon -- like -- Si Not stingy in a A match l1ILIv[iIl rate -- To -- if it levels to formation of ' Large diameter, or upsilon which becomes difficult, and it aspheric-surface-izes and Kneaded kneaded curvature is weakened from an optic axis with Vibration 8i side V peak Concavity r A comb -- K -- therefore, large caliber-ization can be measured. simultaneous -- 1 -- A of a wavelength VC According to spherical aberration can be decreased by this. Article f'F(]) it -- they are the conditions about the right lens at this time, and the difference of a negative lens O Abbe number. Although the restriction about an Abbe number is sharply eased from thing K for which Contact aspheric-surface-izes a field, if the minimum of this condition is surpassed, in Trouble wK, amendment of a fine earth chromatic aberration will become. In account A of a former disk, and the object lens for Nyu, 9 Ball curvature difference is satisfactorily Stoppage(ed) with common knowledge ■, and there are 8 expenses which press down an axial aberration in a diffraction limit. boil the manufacture division of an optical system, etc. -- it is desirable for the Si incidence light to amend a sine condition satisfactorily also by a I was stubborn. case, to a primary shaft, so that there may be little degradation of performance. In this invention, aspheric-surface-izing the object side upsilon side of a right lens and the house side upsilon side of a negative lens can perform sine condition ■ amendment with surface-of-a-sphere Redness. It is set [ amending by page / 0th / aspheric surface-ization, or ] to Trouble #IA in this which surpasses a condition (2) ■ maximum at this time, and generating of top Revenue of To become weary and for outsides in field 0 curvature by the side of the object of a right lens wears and spreads. Conversely, when a minimum is surpassed and curvature becomes strong, the coma aberration 0 Frankness student of turning inward is remarkable, and it is an outgoing vessel to Supplement this by aspheric surface-ization. In any case, a sine condition will get worse, and it will use as an object lens for optical disc record playback, and it will be a Not at all lens. It is expressed with a following formula when a lens is considered to be a light-gage lens from voice and amendment Treaty of Paraxial axial inclusion to the refracting power of a right lens. On the other hand, the peak curvature radius of 1 side 7 field of a right lens is set to r2, and it is refracting power KpFi lens ' of a right lens! It is expressed with a following formula as an I-light-gage lens. % = (n, -1) (MohL) ...... (b) S r2 (a) following formula To present from (1) type -- things -- Idemizu To 0, i.e., - ("'p 1) L, -- 11 whose 1 and af power"'"* To 7 and curvature of the field by the side of the object of a right lens are the differences of the peak curvature of a near field It will become large. 1r2 For (e) type left side's being positive, and carrying out the Ooguchi A-ization of a lens six so that this becomes large since right lenses are both convex lenses, even if it aspheric-surface-izes an inner Oil break side, axis top thickness of a lens must be enlarged -- operation Le congener -- short -- supposing that it is Kakunana -- the time of Enclose 0 This O -- Thing f4 -- the peak curvature of ■ side -- Something -- when it is going to lengthen operation extermination by force, there is no good Enclose exceeding a condition (2) ■ maximum. For this reason, satisfying Pregnancy( 3 is called for. (Collector row) Following present invention! My army which shows seven examples Peak curvature radii r2 of the object side upsilon music of r and Is RUNS are RUNS and @2 lens V Match lupsilon A point IIB Beef tears. ] Shell point curvature Afternoond of the music by the side of lJIg of r and Shisuke 2 lens, and d2ij -- respectively -- RUNS and 2nd lens upsilon axis top thickness nl and n2 ij -- the axis top thickness of refractive-index nud+ [ respectively as opposed to RUNS and the 830 flrrl wavelength light of the 2nd lens ], and an Abbe number dcVi cover glass [ in / in respectively nud2 / RUNS and d line of the 2nd lens ] (l(AtsubeTeIF'i64.1 [ in / in the refractive index to 3Q nm wavelength light / 1.50974 and d bag ] Te 6 Le) M of a cover crow is a rate of Connection party S.) WD is operation Dilian. Aspheric surface shape is a C(=T) KPostcode Circular force constant and A about] four-point curvature in Blood penis (XYZ) which set the X-axis as the optical axis direction by making Jh point of a field into the starting point. It is phi= Ri, when passing, setting A6 and What to P3 and making aspheric surface Furrow, Pl, P2, and P4 into the number of aspheric surface Should. - r - it comes out and can break by the aspheric surface expressed -- details (t: it is 7+ document (with no change by the contents) F A Q (s Calendar side 1f=Lo NA O, 5)) d= 0.2665 A M=OWD=04780 aspheric-surface coefficient and the number of Should The 1st page The 2nd page It is alike and is =-481258D-+-00. The 3rd page Example 2 f=1.o NA 0.50 d, Fo, 2666 The 1st page of the coefficient and Powerful number for M=OWD=0.4513 non-balls The 2nd Toward The 31111st One operation three f=1 *ONA 0.50 dc=0.2666 A M=OWD=0.4548 lack-of-ability side coefficient and What @ number The 1st Therefore The 2nd Therefore The 3rd Toward Example 4 f=1.ONA O,50 d♂0.2666 A M=OWD=0.4134 aspheric-surface coefficient and Power number]

Field The 2nd Therefore w43 page A2=-3J34016L-01P 2=6.0000 example 5f=1.o NA O, 50 d, =0.2665 A M=OWD=0.4189 aspheric-surface coefficient and number operation fMJ of Should 6 f= 1.0 NA 0.50d♂0.2667 A M=OWD=0.4050 aspheric-surface coefficient and number invention of Should 0 effect extraordinary KW called both convex lenses and a negative lens ■ junction lens as this invention shows that section in Drawing 1 -- the amount of small mu(s) which is composition [ 811 ], and also wears lens full length and it spreads as compared with short Nuclear and a publicly known lens -- To Si -- it can manufacture cheaply. And while keeping good lll1 Si clear also from a Yield difference figure who shows in Drawings 2 thru/or 7, a spherical aberration, and a sine condition, it is chromatic aberration 2! A lIl positive is performed and spatula of the spherical aberration by a color is also prevention at Gorges small. furthermore -- also being able to omit a mirror frame and forming the whole object lens including w! and a pipe into small at further, since it is 1 Reputation area of a junction lens -- a cost cut -- Be shy -- things are possible. It is Momentum explanation between 4 and figure 1j[IQ. The Disability+11o figure and Drawings 2 or 7 where Drawing 1 includes this invention theta object lens ■1 operation cover glass is Example 1 thru/or a Turnover seat figure of The center II, respectively. Drawing 1 Drawing 2 spherical aberration IL Chord f4 41 Confiscation X The * obtaining -- Thu 1 spherical aberration ■ Chord fl Jr8 Aberration 4 [A 1 -- the 5 1st sentence ball IIII Yield difference Sine condition J1 Confiscation difference pJL6 carrying out -- one spherical aberration it Chord f11 411" (1 carrying out Xl Roa [) -- 1 ball 1f11 Yield lambda-sine condition 11 oneself and Yield X hand Continued correction honor (method) % type % 1 Display of Incident Showa 59 Patent Application No. [ Two ] 123589, Title of Invention Those Who Do Optical Information Storage and Object Lens 3 Amendment for Reproduction Relation with an incident Applicant for a patent Living Place 1-26, Nishi-Shinjuku, Shinjuku-ku, Tokyo scent No. 2 name (127) Name Konishi 6 photograph Gyokuto, Inc. representative Ide blessing student 4 and representative Postcode105