Scanning head for scanning documents

Translation of description of equivalent WO 0002376 A1

Scanner head for scanning originals

The invention relates to a device with which it is possible to optically scan a document to create an image of the original technical data with respect to brightness or color can.

Devices for optical scanning of documents for conversion into electronic signals are used in so-called scanners, for example, in so-called laser scanners for bar code scanning, such as are used in cash for the acquisition of part numbers in swipe scanners, as are customary in fax machines, in hand-held scanners and flatbed scanners, such as those used for recording the reference and storage of data-related image of the template into computers for further processing of images, drawings or text of the document. Devices for optical scanning of documents are used in photocopiers for imaging the entire document on a photosensitive drum.

According to the number of technical configurations of scanners, there are a number of conventional methods for scanning the original. Two basic principles are used here mainly; first, the scanning of the original using a focused beam of light, preferably in the form of laser scanners, where the light beam is usually deflected by a rotating polygon mirror so that it sweeps the area to be scanned, and secondly, the optical pickup of artwork by a camera that is currently preferably a CCD camera. Solutions that realize the second basic principle, can be divided into two groups, the first of which is characterized in that thrown into an electronic video camera via an optical system, a two-dimensional image of the original on an area image sensor and this is scanned by electronics, whereby the brightness is and color information so-called picture elements or pixels of the template corresponding to the pixels of the sensor in rows and columns divided in series for further processing provided, while the second in - Group in an electronic line camera only a one-dimensional image of the original, so one line of the original, thrown on a line sensor and this is scanned by electronics, whereby the brightness and color information of picture elements or pixels of the template corresponding to the pixels of the sensor divided only into columns is placed in series with the further processing, while the classification must be made in line by a relative movement between the original and the line camera.

The relative movement of the sensor line on the template is achieved in the hand scanner by a quiet and uniform drawing of the resting on the original hand-held scanner on the submission. Here, a lighting sweeps in the form of a narrow generated by LED light strip the original, the reflected light from the document that contains the color and brightness information, is projected through an existing from fixed the hand scanner mirrors and lenses optics on the CCD line sensor, so that it can evaluate a line of the original. A folding the beam path with the optical allows a relatively long line, for example, 4 inches long, to map to a relatively short sensor and compensate for small variations in distance by relatively large depth of field. One is rolling on the presentation to the drawing of the hand scanner roller helps firstly to a possible straight and unverkante- th relative movement of the hand scanner to presentation, on the other hand the angle of rotation of the roller is detected and evaluated by incremental encoder. Thus, the relative position of each line entered on the document to be determined.

In Pass scanners, as they are often used in fax machines, the rolling on the master drum is driven, so that the relative movement is effected by pulling through the submission by the scanner.

In flatbed scanners, the template is the scanned page on a glass plate, while on the other side of the glass plate the hand scanner corresponding Unit from lighting, optics and CCD line sensor is moved straightly by a drive on a parallel to the glass plate guide.

For photocopiers there for imaging an original onto a photosensitive drum preferably two methods, namely, first, a synchronous movement of the original and the drum, in a lengthwise direction of the original narrow, the entire width of the original comprehensive strip-shaped area of ​​the template on a narrow strip of cylinder can be sharply imaged, wherein the strip-shaped region by the synchronous movement of the original and cylinder scans the entire length of the document and is displayed on the circumference of the cylinder, and secondly, a scan of the original with a system of two mirrors, wherein the first mirror moves over the full length of the original, the second mirror only about half as long way, and the optical path is guided so that the distance between the original and imaging optics for projecting the template to the synchronously rotating with the linear movement of the mirror barrel measured along the beam path, remains constant and so the submission by a narrow, over the length of the original shifting strip-shaped region is sharply imaged onto the outer surface of the drum.

also scanners that require or force to realize the scanning of the original by rotation of illumination, imaging optics and sensor about an axis of a cylindrical shape of the template are known.

In EP 0670555 Al shows that even an area sensor with respect to a surface can be moved and can be then recovered as data and processes the image of the technical surface. The movement of a pin configured as an execution on the surface of the original is carried out by hand.

In EP 0164713 AI is shown how the distance of a line sensor can be kept constant by a flat document to be scanned, characterized in that a rolling body at the original end of this distance embodying rod is guided next to the template on a plane parallel to this, and located at a distance of rolling radius of the roller track, while the other end of the rod up of a linear guide and is discharged. Thus a good sampling of the template is accessible only by relatively elaborate guides and large construction volume, if the use under a guideway is possible that still behind is seen by the sensor line (below) the surface of the document to be scanned, which is a scanning excludes, in which the scanner is to be placed on the template.

The invention has the task so map the surface of the template on a line sensor in a small and inexpensive to produce, situated on a flat template in a fixed position device that one and for each line of the template for a sharp image sufficiently constant distance between template is respected optics and between optics and sensor lines. The continuous reading of the information of the line sensor should provide a resolution in line data technical picture of the overall provided for scanning area of ​​the surface of the document for further processing. The Lichtfuhrung should be such that a sufficiently bright and high-contrast image on the line sensor is formed from the surface, which is not disturbed by reflections from components of the unit or the surface of the template without the for accommodating illumination and imaging optics necessary space the use of a bulky body requires. Furthermore, to allow an inexpensive and robust mechanical construction, a realization of the invention.

According to the invention, the object is achieved by a device according to claim. 1 Preferred embodiments are disclosed in the dependent claims.

A particularly advantageous embodiment of the invention is achieved by a line sensor, an imaging optical system and an illumination device combined in fixed arrangement on an optical carrier to a mechanical part, so that with respect to a template can be moved so that points of the optical axis of the imaging optics move on a v-shaped path, so that the distance between the original and the line sensor in sampling measured along the optical axis remains substantially the same. Surprisingly, an almost equidistant scanning with such a device only in narrowly defined range of dimensioning parameters, such as length of square leg, distance from the template and the angles between the hinge legs possible with extremely large errors occur in even the slightest deviation.

Instead of a line sensor, a sensor drum can be selected, whose rotation axis is fixed in the optical carrier with respect to imaging optics and illumination device. To the thus-designed pickup can also be used for photocopying machines with no moving template 10 to allow a design with a small footprint.

In principle, an inventive device can be realized with linear guides. Such a guide may lie in the plane of the original, the second in a thereto inclined, preferably perpendicular plane. The motion of the points of the optical axis between the linear guides extending v-shape that the Linear Guides naturally linear. The production of linear guides is expensive, difficult to achieve small game of the guides and to overcome friction is relatively large. So a particularly advantageous embodiment of the invention is achieved with the use of an articulated quadrilateral whose four sides by two spherical bearings that are permanently positioned in a housing of the device with respect to the template, by two mounted in these hinge bearings arms and by an optical carrier on which the are two arms are mounted in spherical bearings, defined.

During the assurance attainable in a four-bar linkage motion control can be simulated by other mechanical solutions, for example by shaped paths for the two pivot points or other points of the movable optics carrier, so the results Using four rotary bearings in the joints, a very low-cost solution with high precision and stability with low mechanical friction.

Compared to the previously known solutions for flat templates, the invention allows for a particularly achieving smaller designs. So need scanner and photocopier with moving optics, which is implemented either by means of moving mirror systems or by moving the imaging optics, significantly higher than the original size beyond dimensions.

Dimensioning according to the invention of dimensions permits largely free down important reference dimensions, such as the distance of all parts of the template, the angular range of the relative inclination of the optical axis to the original and the scanned width of paper, and achieved low variation of the appearance on the line sensor sharply defined lines of the plane of the template, and thus a low required depth. So the inside diameter of the optics can be chosen relatively large, whereby the uncertainty generated by diffraction at the appearance of the image decreases and widens the beam imaged by the template on the line sensor. This will allow more brightness on line sensor available. This can be used to increase the scanning speed and / or to operate the lighting device with a lower light output.

A favorable configuration of the invention is achieved by providing the necessary illumination to light output is focused by the same optical system, which makes the image of the original onto the sensor, on the template. By an offset optical axis of the illumination beam and mirror can be obtained that^' the illumination beam strikes the original at an angle, which results in that only back-scattered, but not reflected light strikes on the line sensor. In this case, the achievement of a narrow, but at least the line length reaching the light spot, a so-called Lightbar, be reached on the submission by suitable lenses or mirrors in the beam path, for example, cylindrical lenses or curved mirrors.

By suitable mirror dimensions of the optics carrier can be formed so that it has a down taper is box towards the template, which occupies a space and its potential movement, which is not, or at least not much wider than the original and mechanically very stable.

there when the lighting serving light sources, for example, one or more light emitting diodes, can be installed together with the line sensor on a circuit board, for example, next to the line sensor.'s manufacturing technology, especially low

A particularly compact design can be achieved if the beam path between the optical system and line sensor is folded. For example, conventional line sensors housing dimensions of 10 mm by 40 mm. With a line length of 20 mm for example, so the line sensor is twice as long, so that when a non-folded optical path, a thickness of the case of more than 40 mm results. A reduction of the dimensions of the line sensor is only to a limited extent in order to smooth the sensor surfaces are smaller and would take necessary amounts of light and image sharpness.

In the folded beam path can also be the light beam to be included so that the serving for illumination light sources may continue to be placed next to the line sensor. However, it is also possible to choose the reflecting mirror so narrow that the light beam laterally thereon passes so extends not folded until it impinges on the optics.

More favorable design possibilities erfmdungsgemäßer devices can the figures and table below. show he figures

Figure 1: Overview of the geometrical arrangement;

Figure 2: v-shaped path;

Figure 3: Location of the position, which is sharply imaged on the sensor; Figure 4: Arrangement with folded optical path;

Figure 5: Overview with folded optical path;

Figure 6: Representation of geometrical optics;

Figure 7: Representation of the curve in L3m

Depending on Lim; Figure 8: section perpendicular to the plane of Figure 1; Figure 9: lighting through optics tretendem

Light beam using mirrors; Figure 10: Change the scan angle.

Figure 1 shows a particularly advantageous embodiment of the invention using a four-bar linkage in a schematic view and an arbitrary position.

The four-bar linkage 28 lies in the plane of representation. Thus, a description of the geometry in two-dimensional Cartesian coordinates X and Y. Accordingly, sufficient are the points Pn, where n = 0, l, ..., 9 the reference numerals 0,1, ..., 9, and assigned to have the X coordinates Pnx and the Y coordinate Pny. The articulated quadrilateral comprises the two with respect to the template 10 fixed hinge points 1 and 2 and the movable pivot points 3 and 4. The distance 21 of the points 1 and 3 is connected to Ll, the distance 22 of the points 2 and 4 with L2, the distance 23 of the points 3 and 4 with L3 and the distance of the points 24 1 and 4 denoted by L4. The axes of rotation of the four-bar linkage 28 are located in the joint points 1 to 4 and are to the plane at right angles. Similarly, the napkin 10, the rows and the line sensor 13 are arranged perpendicular to the display plane.

To simplify the mathematical representation are without limiting the generality of the reference point 0 of the coordinate system (X, Y) at random in the middle between the reference to the presentation fixed pivot points 1 with coordinates (Plx, Ply = 0) and 2 with the coordinates (P2x = -Plx, P2Y = 0) and the X-axis of the coordinate system 29 arbitrarily designated by the points 1 and 2. FIG.

The midpoint of the distance from hinge point 3 to the hinge point 4 is designated as point 6, which is the original point closer to the distance 31, also referred to as L5 to that route in point 6 as point 7th 7 illustrates point represents the point of the outgoing light within the light beam 19, 20 with the optical axis 25 is focused by the optics 11 on the line sensor. 13

The optics 11 facing scanned page of the template 10 is aligned parallel to the X-axis 29 of the coordinate system, the middle line of the document has the position 5. optics 11 and line sensor 13 have with respect to the distance from point 3 to point 4 a fixed position, are arranged centrally and at right angles to the median perpendicular this route. The coordinates of the points n where n = (0, l, 2, ...) are in the representation with (Prix, Pny), where Pnx representing the X coordinate and the Y coordinate Pny in the coordinate system.

The angle α between the distance of hinge point 2 by pivot point 1 and of hinge point 2 by pivot point 4, the angle γ is ß between the distance from pivot point 1 by pivot point 2 and of hinge point 1 to point of articulation 4, angle between the distance from pivot point 1 to point of articulation 4 and of fulcrum 1 to hinge point 3, the angle ε between the distance of hinge point 1 by pivot point 2 and of hinge point 3 to pivot point 4, thus also between the optical axis 25 from point 7 to point 6 and the perpendicular to the original 10th

With the choice of length 21 (Ll) equal length 22 (L2) can be the coordinates and angles for example, depending on the angle α calculated:

P4x = P2x - Ll * cos α

P4Y = P2Y + Ll * sin α L L44 == ((((PP44yy - PPllyy))²² ++ ((PP ^ 4x - Plx)² )^1/2) S = 0.5 * (Ll + L3 + L4) ß = 2 * arctan ((((s - L4) * (s - Ll)) / (s * (s - L3)))^{, / 2}) Γ = arctan ((P4Y - Ply) / (P4x - Plx))

P3x = Plx + Ll * cos (ß + γ)

P3Y = Ply + Ll * sin (ß + γ)

P6x = 0.5 * (+ P3x P4x)

P6y = 0.5 * (+ P3Y P4Y)

P7x = P6x + L5 * (P3Y - P4Y) / L3

P7y = P6y + L5 * (P4x - P3x) / L3 ε = arctan ((P4Y - P3Y) / (P4x - P3x))

The choice of the angle α as an independent variable is arbitrary.

An exemplary embodiment of the invention is shown for p5y = 64, all measurements can be in millimeters exemplary. To obtain a different size all sizes can proportionally increased by the same factor or reduced. Ll and L2 therefore be chosen as a rule so that the pivot points 1 and 2 does not lie behind the original so Ply and P2Y are not greater than p5y. For scanned width to about 80 mm is a version with the data P2 = (24.80, 0.00), L1 = L2 = L3 = 32.00, P5 = (00:00, 64.00) with respect to mechanical stability low. It arises L5 = 94.77.

In Table 1, the angle shown α resultant earnings figures for certain values, the resolution of the display of the values ​​in the table with the coordinates of the point 7 chosen to 1/100 mm, while the coordinates of the other points with 1mm resolution are given to describe the position of the points in approximately.

The optimization in the illustrated example of utilization of the depth of field of the imaging optics of +/- 0.11 mm and a width-to-use 70 mm corresponding to a region for P7x from -35 mm to +35 mm and for P7y from 64.11 mm to 63.89 mm performed been.

Figure 2 shows the v-shaped course of the point 6 in the above dimensions, but on a different scale than Figure 1. If selected on the optical axis, the center position of the line sensor 13, the extension of the v-shaped path in the X direction Währe low , in the Y direction more pronounced.

Figure 3 shows the resulting path of the point 7, which would ideally be on a straight line, the Y coordinates are shown ten times too high, because otherwise the opposite of the Y-coordinate of point 5 resulting discrepancies in the figure would be hardly recognizable.

In one embodiment of the invention is achieved to realize a core area of ​​the scan with very high precision of the image of the original 10 on the line sensor 13 and a to this area, at the subsequent border area with lower demands on the precision of the image of the original 10 on the line sensor 13 . wherein the edge region at the scan to acquire coarser structures of the template 10 as edge detection or to describe the template coarsely coded data is used as the core is sampled at full resolution. In the example shown, the core region includes an area for P7x from -32.2 mm to +32.2 mm with P2Y of - 64.11 mm to -64.00 mm, while the edge region an area for P7x from -35 mm to -32.2 mm and +32.2 mm to + 35 mm with P2Y of -64.00 mm comprises to -63.89 mm. In this case, for the placement of the original 10 authoritative position of point 5 is optimally at P5x from 64.05 mm to 64.06 mm, whereby the distance of the point 7 remains from the original 10 in the core area is smaller than 0.06 mm and Tscheby- scheff characteristic has while it does not exceed 0:16 mm in the edge region.

Typical line sensors 13, for example, SONY ILX503A, have a line length of 2048 Büdpunkten, called pixels, with a pixel size of 14 microns and a pitch of 14 microns. If to be detected by the line sensor line length of a perpendicular to the plane 27 extending line of the template is 20:48 mm, it follows with linear imaging through the lens 11 a necessary magnification of 1.4 or a related to the original 10 pixel size of 10 microns by 10 microns with a pitch of 10 microns.

The figure 4 represents a plane perpendicular to the reference plane of the Figure 1 section is in the points 6 and 7 an embodiment of the invention. A comparatively long line sensor 13 which, in this example an external mechanical length of about 42 mm and a line length of 2048 by 14 microns so has 28,672 mm, can be accommodated as space saving. 4 shows only the light-sensitive part of the line sensor 13 is shown. Much the side with respect to the model 10 displacement of the optics 11 and the use of a mirror is 12. The dimensions shown are obtained if the optics 11 with a focal length of 12.5 mm, a diameter of 9.5 mm and a distance between the main planes 17, 18 is used by 1.8 mm. The beam path is shown in international customary manner. The same is in Horst Czichos (ed.): Hovel - Fundamentals of Engineering Sciences, 29th edition, Berlin et al .: Springer-Verlag, 1989, ISBN 3-540-19077-5, p find 220 ff.

In Figure 5, the view can be seen on the reference plane of Figure 1 with the embodiment shown in Figure 4 for an arbitrary angle α. By combining displacement and rotation of the movable in relation to the original 10 optics carrier with parts optics 11, mirror 12 and line sensor 13 a narrower compared to a plane parallel to the document guide this mechanism design of the entire scanner head can be reached without the angle between the template 10 and the optical axis 25 as far from the right angle is as pure rotation of the optics, if for this the axis of rotation should not be further from the template 10 than the pivot points 3 and 4 in its greatest distance at α = 90 ° and ß + γ⁼⁼90^O are.

In figure 5 is also shown that the mirror 12 is trapezoidal, as the effective for the imaging of one line on the line sensor 13 light beam tapers with increasing distance from the optical eleventh

In the figures 4 and 5, is a relatively small focal length, based on the line length of 20:48 mm of the template shown. It can on the one hand the characteristic dimensions that lead to the definition of the points 1 to 7, are all reduced in the same proportion to the document to be scanned width leads to reach the maximum allowable distance between the original and the Section 7. Secondly, the focal length of the optical system 11 can be increased and the positioning of optics 11, mirror 12 and line sensor 13 invention are adapted training under.

In Figure 6, the optical terms used are shown. Thus, the object to be imaged G is imaged by the optical system 11 in the image B, whereby the distance between the object G and the first principal plane 17 as the object distance g, defined between the second main plane 18 and the image B as the image distance b and between the two Principal planes is designated 17 and 18 as a principal plane distance h. For simplification, it takes between the two main planes 17 and 18 of the beams as to the optical axis running parallel to, said optical axis than the straight line through the two focal points is regarded 8 and 9. FIG. In geometrical optics, it does not depend on the diameter of the optic 11 so that the construction of the figure from the object to image is the representation of the involved radiation beam irrelevant. An illustration in the Gaussian sense of geometrical optics represents an approximate consideration that is sufficient to explain the invention, for the precise calculation of optimal solutions but is not sufficient because it does not consider, for example diffraction effects, in which the diameter of the optic 11 plays an essential role.

An essential advantage of the invention is that optics 11, mirror 12 and the line sensor 13 is mounted in a rigid lens carrier 16 and, if appropriate, can be adjusted, which in the articulation points 3 and 4 of the four-bar linkage 28 the respective axes is stored.

In Figure 7, the Bezier curve for the determination of the measure L3m, which is needed for carrying out the method of the invention for calculating the length 23, called L3, represented graphically. With the given data to determine in a generally known manner can also be carried out mathematically.

For a description of the method is generally determined without loss of generality:

Ply = P2Y = P0y = 0 = Plx -P2x with P2x »0 P5x = 0 L1 = L2 It can first of all the reference measurement 33, referred to in the formulas LO, are set corresponding to the maximum extension of the device according to the invention between template 10 and bar linkage 28 with respect to the Y-axis 30 of the coordinate system.

There, the distance p5y of the origin 0 and thus the fixed pivot points 1 and 2 are selected from the original 10, one of the original 10 as close as possible location results in a particularly wide scan field.

Thus, the lengths give 21 (Ll), 22 (L2) of the first and second movable arm 14, 15 to

L1 = L2 = L0 - p5y.

The possible scanning width of the template 10 is given by the members of the accuracy required maximum value of the deflection of the point 7 in the X direction P7x (max), for the distance from the template 10, so | P7y - p5y |, corresponding to this precision, to double of P7x (max). P7x (max) can be estimated:

P7x (max) "L0 * (0.58333 - 0.175 * p5y / L0 -0.18 * (p5y / L0)^Λ2)

It may be the situation Plx, P2x of two fixed pivot points 1, 2 of the four-bar linkage 28 can be selected. The larger the value P2x is selected, the higher the strength and Unempfmdlichkeit against small deviations, the wider but also the required total for the facility expansion in the X-axis 29 of the coordinate system. Furthermore, the following limit applies:

P2x (max) = L0 * (1.16666 - p5y / L0) The length 23, called in the formulas L3, the corresponding third movable rectangle side optics carrier 16 is determined in the following steps:

a) Xx = P2x / L0

b) Vxx = 0.66585 -4.2054 * Xx + 5.6624 * Xx^Λ2 -3.8695 * Xx^Λ3

c) Vy = 0.19421 -0.95048 * Xx + 0.02057 * Xx^Λ2 + 0.3072 * Xx^Λ3

d) V = 0.9264 +0.87303 * Xx -2.6595 * Xx^Λ2 +0811 * Xx^Λ3

e) Llm = (Ll / L0 + Vxx) * V

f) In the points

(-0.1625, 0.3)

(-0.13125, 0.46458)

(0.01146, 0.25625)

(1.0, 0.2151) given Bezier curve of the two dimensions Lim, L3m is determined the belonging to Lim value L3m.

g) L3 = L0 * (L3m - Vy)

h) with L3 in point 7 resulting coordinates P7x, P7y be calculated for different angles α, where appropriate, of to be considered manufacturing tolerances for the positions of the pivot points 1, 2, 5 and the lengths 21, 23, 24 of the movable linkage sides 14 , 15, 16 of the four-bar linkage 28, and L3 adjusted slightly as the length 23 is used. Using the example of the interpretation of the scanner head with a scan width of 60 mm, the process is illustrated below. L0 is selected with 60 mm, 25 mm and P2x with p5y with 15 mm. P2x (max) is found to be 55 mm, is so respected, P7x (max) to about 31.7 mm, so sufficient. Ll is found to be 45 mm, Xx to 0.41667, Vxx to - 0.38326, Vy to -0.17603 and V to 0.88711. Lim This is calculated to 0.32534. In the Bezier curve can be to read L3m to 0.2782. L3 This results to 27.2538 mm. An investigation with fine optimization results for a sample width of 60 mm corresponding to a value for P7x of 30 mm, a maximum difference | P7y - p5y | of 87.5 microns with a shortening of L3 to 6:27 per thousand to 27,083 mm. This angle α is modulated to 92.1 degrees, the optical axis reaches an inclination ε for submission 10 of 14.8 degrees. Thus, the optical axis in the peripheral regions through the point (26, 0), the bearing of the second fixed pivot point 2 must not therefore extend into the area of ​​the effective light beam 19 to 20 This can be achieved that can be seen the pivot points 1 and 2 at a sufficient distance as shown in Figure 5 of the template 10 and / or are sufficiently positioned in the X direction, or the fact that the movable linkage sides 14, 15 in the tuning fork shape their fixed pivot points 1, 2 sufficiently far above and hold below the effective light beam.

In Figure 8 is in a section parallel to the Y axis 30 and perpendicular exemplified to the reference plane of Figure 1 at an α of 90 degrees, as belonging to the fixed hinge points 1, 2 bearing for the first and second movable rectangle side 14, 15 can be formed by molding the housing 34 and belonging to the movable pivot points 3, 4 bearing between the first and second movable arm 14, 15 and the third movable rectangle side, the optics carrier 16 by a bearing pin 35th

With a focal length of the lens system 11 by 12.5 mm and a magnification of 1.4 results in an object distance of 21:43 mm. With an effective diameter of the optic 11 of 8 mm, an opening angle of light emanating from a line effective results Beam of arctan (0.5 * 8 mm / 21:43 mm) = 10.6 degrees. The image distance is found to be 30 mm, the opening angle corresponding to 7.6 degrees. With a maximum ε of 14.8 degrees so that a range of 4.2 degrees is on the object side freely, on the image side, a range of 19 degrees, so that the clear cross section of the housing 34 in the reference plane of Figure 1 with decreasing y coordinate must not increase but to the optic 11 can be easily and then decrease significantly.

For the lighting must be ensured that the angular displacement of the optical axis with respect to the submission of 10 ± ε no substantial change of the original brightness and not picked up by the optical system 11 causes reflection. For this purpose, the opening angle of the light beam of the illumination device is to maintain sufficiently small and to keep the light beam against the bill at a favorable angle range inclined.

In Figure 9 shows how a light beam for illuminating the shared optics 11 for focusing on the template, using a plurality of, two in the example shown, mirrors 37, 38 can be performed. The drawn boundary 39 of the light beam represents a particularly broad light beam including to consider position tolerances of the mirror 37, 38 is that in the ε by the maximum value of the angle of the optical axis with respect caused 25 to the template 10 maximum inclination of the optical axis 36 the light beam 10 is in relation to the template 10 when reaching the submission by the light beam.

In figure 10 is shown, which cover angle range, the lateral boundaries 19, 20 of the effective light beam from the original 10 via the optics 11 to line sensor 13 before reaching the optics 11th This area is kept free of the light reflected by the original 10 radiation of the beam of light in FIG. 8

It can clearly be seen that with a relatively large diameter of the optic 11 while a large angle of the radiation detected as an effective light beam, but also the border the feasibility is achieved. In another embodiment of the invention, the inside diameter of the optic 11 is deviating from the intended circuit, for example in the form of a rectangle, in which the long side is parallel to the line. Thus, the light beam shown in Figures 9 and 10 can be made narrower and impinging the beam of illumination steeper on the template. With a diameter of the optic 11 of 8 mm, an optical cross section of 50 mm results in²In a rectangle of 8 mm * 4 mm, a cross-section of 32 mm², That is from 64 percent at a reduction in the angle by half, while it would have been only 25 percent at 4 mm diameter. As limit of narrowing the diffraction limit should be observed.

Through proper selection of the inclination of the mirror 37 and 38 can be achieved, that the mirror can be arranged relatively close to the lateral boundaries 19, 20 of the effective light beam and thus the dimensions of the housing 34 in the X-axis 29 in the range between can be kept small template 10 and optics 11th

In order to generate the light beam of illumination are light emitting diodes, called LEDs, suitable. Using these on the original remote end of the optical system 11 with respect to the optical axis 25 of the optic 11 twisted and / or displaced optical axis 36, so you can by appropriate positioning of the LED and through the choice of focal length, position and orientation of a cylindrical lens in the beam path of the reach the light beam of illumination that the image of the light emitting surface of the LED on the template 10 illuminates the imaged line as a bright line or narrow beam. Using multiple LEDs can also be used with a common cylindrical lens to increase the intensity and / or to equalize.

The use illustrated in Figure 8 of two mirrors 37, 38 can be extended bilaterally symmetrical. In addition, the two mirrors 37, 38 on each of both sides are positioned and extended such that it can be a common component creased. This is achieved at the same time that the one entry of foreign light is largely suppressed in the optical range, that for the second in composite the two mirror combinations 37, 38 with a base and / or ceiling plate as a third movable rectangle side, can be designed as an optical carrier 16 in the form of a mechanically stable moving part.

In one embodiment, the mirror can also be curved 37.38, depending on the configuration even without a bend, but with shifting transition, so that only a mirror can be seen on each side. This can be dispensed with a cylindrical lens.

Comparing the results of the invention with conventional solutions, the result is compared to linearly moving optics a simplified mechanism with a reduction of the necessary housing width. Compared to pure rotational scanning with the same scanning angle and therefore a radius of about 100 mm a flat template can be used, while there, the deflection would no longer negligible with about 4 mm, and also achieved a significant reduction of body width and length since 10 are simultaneously performed inclination and displacement of the optics 11 during a scanning of the original.

Table 1 :

P7x P7y P6x -P6y P4x -P4y P3x -P3y α ß γ ε

0.00 64.00 0 31 16 31 -16 31 74.0 37.0 37.0 0.0

3.15 64.00 1 31 17 31 -15 30 76.2 35.3 36.5 1.2

5.65 64.01 2 31 18 31 -14 30 77.9 34.0 36.1 2.2

7.46 64.02 3 31 19 31 -13 30 79.1 33.0 35.8 2.8

9.29 64.03 3 31 19 32 -13 30 80.3 32.0 35.5 3.5

10.41 64.04 4 30 20 32 -12 29 81.0 31.3 35.3 4.0

11.91 64.05 4 30 20 32 -12 29 82.0 30.5 35.1 4.6

13.06 64.06 5 30 21 32 -11 29 82.7 29.9 34.9 5.0

14.60 64.07 5 30 21 32 -11 29 83.6 29.0 34.6 5.6

15.77 64.08 6 30 22 32 -10 28 84.4 28.4 34.4 6.1

17.37 64.09 6 30 22 32 -10 28 85.3 27.5. 34.2 6.7

19.40 64.10 7 30 23 32 -9 28 86.5 26.3 33.8 7.5

25.42 64.11 9 29 25 32 -7 26 89.9 22.9 32.9 10.0

26.33 64.10 9 29 25 32 -6 26 90.4 22.3 32.7 10.4

27.26 64.09 10 29 25 32 -6 26 90.8 21.8 32.6 10.8

28.20 64.08 10 29 26 32 -6 26 91.3 21.3 32.4 11.2

28.68 64.07 10 29 26 32 -6 26 91.6 21.0 32.4 11.4

29.65 64.06 10 29 26 32 -5 25 92.0 20.4 32.2 11.8

30.14 64.05 10 29 26 32 -5 25 92.3 20.1 32.2 12.0

30.64 64.04 11 29 26 32 -5 25 92.5 19.9 32.1 12.2

31.14 64.02 11 29 26 32 -5 25 92.8 19.6 32.0 12.4

31.65 64.01 11 28 26 32 -5 25 93.0 19.3 31.9 12.7

32.16 64.00 11 28 27 32 -5 25 93.2 19.0 31.9 12.9

32.68 63.98 11 28 27 32 -4 25 93.5 18.7 31.8 13.1

33.21 63.97 11 28 27 32 -4 25 93.7 18.4 31.7 13.4

33.75 63.95 11 28 27 32 -4 24 94.0 18.0 31.6 13.6

34.29 63.93 12 28 27 32 -4 24 94.2 17.7 31.6 13.8

34.84 63.91 12 28 27 32 -4 24 94.4 17.4 31.5 14.1

35.39 63.88 12 28 27 32 -4 24 94.7 17.1 31.4 14.3

35.96 63.86 12 28 28 32 -3 24 94.9 16.7 31.3 14.6

36.54 63.83 12 28 28 32 -3 24 95.2 16.4 31.3 14.9

37.12 63.80 12 28 28 32 -3 23 95.4 16.1 31.2 15.1

37.72 63.76 13 28 28 32 -3 23 95.6 15.7 31.1 15.4

38.33 63.73 13 28 28 32 -3 23 95.9 15.3 31.0 15.7

38.95 63.69 13 27 28 32 -3 23 96.1 15.0 31.0 16.0

39.58 63.65 13 27 28 32 -2 23 96.4 14.6 30.9 16.3

40.23 63.60 13 27 28 32 -2 23 96.6 14.2 30.8 16.6

40.89 63.55 13 27 29 32 -2 22 96.8 13.8 30.7 16.9

41.57 63.49 13 27 29 32 -2 22 97.1 13.4 30.7 17.3 Bezugszeiehenliste

Origin PO (POx, POY)

(First) fixed pivot point Pl (Pl, Ply)

(Second) fixed pivot point P2 (P2x, P2Y)

(First) movable pivot point P3 (P3x, P3Y)

(Second) movable pivot point P4 (P4x, P4Y)

Center P5 (P5x, p5y) the template 10

Center P6 (P6x, P6y) of the optics carrier 16 imaged point P7 (P7x, P7y) first focus of the optics 11 second focus of the optics 11

template

optics

mirror

Line sensor first arm second arm

Optics carrier first principal plane of the optical system 11 second principal plane of the optical system 11 lateral boundaries of the effective light beam

Length Ll of the first arm 14

Length L2 of the second arm 15

Length L3 of the lens carrier 16 v-shaped path optical axis

bar linkage X-axis of the coordinate system Y-axis of the coordinate system reference measurement distance L5 L0 housing bearing pin optical axis of the illumination lighting Mirror lateral boundaries of the beam of light