Scanner head for optically scanning master documents line by line e.g. for fax machines and copiers

The invention relates to a device with which it is possible is an original optically scan to a datentechni cal image of the original with respect to brightness or color it To ask.

Devices for optical scanning of templates for order translation into electronic signals in a scan, ners used for example in so-called laser scanners Barcode detection, as from in cash for detecting Item numbers are used in swipe scanners such they are common in fax machines, in hand-held scanners and flat bed scanners as for receiving the reference and Abla ge of a data-related image of the template in computers for further processing of images, drawings or texts find the original use. Devices for optical Scanning of originals for in photocopiers Depicts the entire document on a photosensitive Trom mel used.

According to the multitude of technical refinements of Scanners, there are a number of common procedures to pick up the document. Two basic principles are as used in most categories, namely, scan the template using a focused beam of light, before preferably in the form of laser scanners, where the light beam mostly deflected by a rotating polygonal mirror so is that it sweeps the area to be scanned, and secondly, the optical pickup of artwork by a Kame ra, currently preferably a CCD camera. Solutions containing the realize second basic principle, can be divided into two Grup pen divided, the first of which characterized is that in an electronic video camera via an Op tik a two-dimensional image of the original on a FLAE chenbildsensor thrown and this means abge Electronics is scanned, whereby the brightness and color information so-called picture elements or pixels of the original corre accordingly the image elements of the sensor in rows and columns divided in series for further processing available Swimming is provided, while in the second group in an elec tronic line camera only a one-dimensional image of the Template, ie a line of template on a cast line sensor and this means abgeta Electronics is stet, whereby the brightness and color information of Picture elements or pixels of the template corresponding to the image elements of the sensor only in columns divided serially to further processing is provided, while the division into lines by a relative movement between Docu- ment and line camera must be made.

is the relative movement of the sensor line on the submission the hand-held scanner with a calm and uniform drawing of resting on the original hand-held scanner on the pros position reached. Here, a lighting sweeps in shape a narrow strip produced by light emitting diodes the submission, the reflected light from the original, the contains the color and brightness information is a fixed of the hand scanner mirrors and Lin Sen existing optical system projected on the CCD line sensor, so that it can evaluate a line of the original. A Folding the beam path with the optical system allows a relatively long line, for example, 43 inches long, on a depict relatively short sensor and small distance Schwan fluctuations compensate by relatively large depth of field. A when pulling the hand scanner to the template rolling roller helps firstly to a possible gradli Nigen and unverkanteten relative movement of the hand scanner to submit, on the other hand, the angle of rotation of the roller detected by incremental and evaluated. So can also the relative position of each detected line to the template be determined.

In Pass scanners, such as those frequently used in fax machines be that rolling on the master drum is driven industry ben, so that the relative movement by pulling through the Template is caused by the scanner.

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

For photocopiers there for imaging a template on a photosensitive drum preferably two proceedings reindeer, firstly a synchronous movement of template and drum in which schma a lengthwise of the template ler, the entire width of the original comprehensive streifenför Miger area of ​​the template on a narrow strip of can be imaged sharply cylinder, wherein the strip shaped region by the synchronous movement of template and cylinder scans the entire length of the document and on the circumference of the cylinder is ready, and secondly a Pick up the document on a system of two mirrors, where at the first level over the full length of the Vorla ge, the second mirror be only about half as long way moved, and the optical path is guided so that the distance between template and imaging optics for projecting the Prior location in synchronism with the linear movement of the Mirror rotating drum, measured along the Strahlenwe ges, remains constant and so the submission by a schma len, shifting over the length of the original strei fenförmigen area keen on the lateral surface of the drum is mapped.

also scanner having a cylindrical form are known to the Template require or force to the scanning of Artwork by rotation of illumination, imaging optics and Sensor in order to realize an axis.

In EP 0670555 A1 it is shown that also a Flächensen sor can be moved relative to a surface, and how then won the technical data image of the surface and ver can be worked. The movement out of a pin stalteten execution over the surface of the submission follows this by hand.

In EP 0164713 A1 it is shown how the distance of a Sensor line of a flat document to be scanned by can be kept constant, that a rolling body on template end of this distance embodying rod next the template on a plane parallel to this and at a distance of Rolling radius of the roller situated web is guided, while the other end of the rod of a linear guide up is and discharged. This is only a relatively manoeuvrable guides and large construction volume a good scan the template achievable if the use under a Füh is approximately ground possible, seen from the sensor line still lies beneath the surface of the document to be scanned, which excludes a scanning, in which the scanner on the Template should be placed.

The invention has the task in a small and cost manufacturable low, on a flat template in solid Po sition contained device, the surface of the template so on map a line sensor, that for each row presenting a sufficient for a sharp image kon stant distance between template and optics as well as between Op tik and line sensor is maintained. The rolling out Read the information of the line sensor is an in-line resolution data technical picture of the total provided for scanning range of Oberflä che the template for further processing put. The lighting should be such that from the surface a sufficiently bright, high contrast Image on the line sensor is formed, which does not by Refle early reflections of parts of the device or the surface of the Template is disrupted without the for housing Illumination and imaging optics necessary space the USAGE tion of a bulky body requires. Furthermore, to a realization of the invention, a price values ​​and allow robust mechanical construction.

The object is inventively achieved by a device dissolved according to claim. 1 preferred embodiments can be found in the dependent claims.

A particularly advantageous embodiment of the invention is as by accomplished by a line sensor, an imaging optical system and an illumination device in a fixed arrangement on combines an optical carrier to a mechanical part, which can be moved with respect to a template so that Points of the optical axis of the imaging optics to moving a V-shaped path so that the distance between Template and line sensor measured when scanning this along the optical axis remains substantially the same. Surprisingly, an almost equidistant scanning with such a device only in narrowly defined Selection of design parameter, such as length of four corner leg, distance from the template and the angles between the joint legs possible, with only minimal Departing extremely large errors.

Instead of a line sensor, a sensor drum can ge are selected, whose axis of rotation in relation to the imaging optics and illumination device in the optics carrier angeord fixed is net. Thus, the so-designed pickup for Photocopying machines with no moving template <b>10</b> turned be set to a design with a small footprint to enable.

In principle, an inventive device with Line arführungen be realized. Thus, a guide in the Plane of the original lie, the second in a to geneig th, preferably vertical plane. The movement of Points of the optical axis between the linear guides extends V-shape that the Linear guidance course line ar. The production of linear guides is however aufwen difficult to achieve dig, little game of guides and to overcome friction is relatively large. Thus, a particularly advantageous embodiment of the invention with the Use of an articulated quadrilateral reached its four Sides by two spherical bearings that in a housing Device is firmly positioned with respect to the template, by two mounted in these hinge bearings arms and an optical carrier on which the two arms in spherical bearings are stored are defined.

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

In comparison to the previously known solutions for flat Before lay the invention allows a particularly small achievement Designs to. So need scanner and photocopier with be Wegter optics, either by means of moving mirror systems or is realized by moving the imaging optics, significantly on the submission size beyond dimensions.

Dimensioning according to the invention the dimensions he permits a largely free down important Bezugsma SSE, as the distance of all parts of the template, the angle range for the relative inclination of the optical axis to the Template and the scanned width of paper, and he aims slight deviations of the look on the line sensor-focus line of the plane of the original and thus a low required depth. So can the inside diameter of the optics relatively large selected who the thereby generated by diffraction at the optical reduces blur the picture and that of the template Light beam imaged on the line sensor widened. This will allow more brightness on line sensor available.

This can be used, the scanning speed to increase and / or the illumination device with less operate light power.

A favorable configuration of the invention is characterized it sufficient that the time required for illumination light output by same optics that also the image of the original on the Sensor performs, is focused on the template. By an offset optical axis of the illumination beam and levels can be achieved that the illumination ray bundle impinges at an angle to the template, the results in that only backscattered but not reflektier TES light incident on the line sensor. Here, the educa Errei ment of a narrow, but at least the line length relevant light spot, a so-called light beam on the submission by suitable lenses or mirrors in the beam be achieved gear, for example, by cylindrical lenses or curved mirrors.

By suitable dimensioning can mirror the optics carrier be designed so that it does to a direction Template tapering box represents the Enclosure Lich its possible movements occupies a space not or at least not substantially wider than the Vorla is open and mechanically very stable.

it's manufacturing technology, particularly favorable when the Be lighting serving light sources, for example, one or several LEDs, together with the line sensor on ei ner circuit board can be mounted, for example, next to the line sensor.

A particularly compact design can be achieved if folded the beam path between the optics and sensor lines becomes. For example, conventional line sensors Gehäuseab dimensions of 20 mm by 40 mm. With a line length of at for example 20 mm is thus the line sensor twice as long, so that when a non-folded optical path has a thickness of the housing of about 40 mm results. A reduction of the Dimensions of the line sensor is only to a limited extent, because thus the sensor surfaces are smaller and neces quired light quantity and image sharpness would increase.

In the folded beam path can also be the lighting ray bundles are included, so that the illumination device serving light sources continue alongside the Zeilensen sor can be arranged. However, it is also possible for the to choose reflecting mirror so narrow that the Be leuchtungsstrahlbündel laterally past it goes, so to not folded to impinge on the optics runs.

More favorable design possibilities invention Devices can be taken from the figures and the table will.

The figures show

<b>Fig.</b> 1: Overview of the geometrical arrangement;

<b>Fig.</b> 2: V-shaped web;

<b>Fig.</b> 3: Location of the position that keen on the sensor is ready;

<b>Fig.</b> 4: Arrangement with folded optical path;

<b>Fig.</b> 5: Overview with folded optical path;

<b>Fig.</b> 6: representation of geometric optics;

<b>Fig.</b> 7: Representation of the curve L3 in m Dependence on L1 m;

<b>Fig.</b> 8: section perpendicular to the plane of the <b>Fig.</b> 1;

<b>Fig.</b> 9: lighting through optics tretendem Light beam using mirrors;

<b>Fig.</b> 10: change in the scanning angle.

<b>Fig.</b> 1 shows a particularly advantageous embodiment of the He making using a four-bar linkage in schemati cal representation and an arbitrary position.

The four-bar linkage <b>28</b> lies in the plane of representation. Thus satisfies a description of the geometry in two-dimensional Cartesian coordinates X and Y. are Accordingly, the Points Pn, where n = 0, 1, ..., 9 the reference numerals <b>0</b>. <b>1</b>, ..., <b>9</b> Trains arranged and have the X coordinates and the Y-Pnx Koordi naten Pny. The articulated quadrilateral comprises the two with respect to the template <b>10</b> fixed pivot points <b>1</b> and <b>2</b> and bewegli chen pivot points <b>3</b> and <b>4</b>, The distance<b>21</b> the points <b>1</b> and <b>3</b> with L1, the distance <b>22</b> the points <b>2</b> and <b>4</b> with L2, the distance <b>23</b> the points <b>3</b> and <b>4</b> with L3 and the distance <b>24</b> of the Points <b>1</b> and <b>4</b> denoted by L4. The axes of rotation of the joint quadrilateral <b>28</b> located in the hinge points <b>1</b> to <b>4</b> and are to the plane at right angles. Similarly ago are location <b>10</b>Whose lines and the line sensor <b>13</b> perpendicular arranged to the plane.

To simplify the mathematical representation are without Limiting the generality of the reference point <b>0</b> the Koordi natensystems (X, Y) arbitrarily in the middle between the with respect to the template fixed pivot points <b>1</b> with Koordi ordinates (P1x, P1y = 0) and <b>2</b> with coordinates (P2x = -P1x, P2Y = 0) and the X axis <b>29</b> the coordinate system of arbitrariness Lich by points <b>1</b> and <b>2</b> placed.

The midpoint of the segment of hinge point <b>3</b> after joint Point <b>4</b> is a point <b>6</b>, The template further point the distance <b>31</b>, Also referred to as L5 to this route in point <b>6</b> is a point <b>7</b> named. Point<b>7</b> represents the Point is, of the outgoing light within the Lichtbün dels <b>19</b>. <b>20</b> with the optical axis <b>25</b> through the lens <b>11</b> on the line sensor <b>13</b> is focused.

The optics <b>11</b> facing scanned page of the document <b>10</b> is parallel to the X axis <b>29</b> out of the coordinate system directed; the middle line of the document has the position<b>5</b>, optics <b>11</b> and line sensor <b>13</b> have regard to the route of point <b>3</b> by point <b>4</b> a fixed position, are to the center vertical this route is centrally and at right angles assigns. The coordinates of the points n where n = (0, 1, 2, ...) are in the illustration (Pnx, Pny), where the Pnx X-coordinate and the Y coordinate Pny in the coordinate system represent.

The angle α between the distance of hinge point <b>2</b> by fulcrum <b>1</b> and the hinge point of <b>2</b> after fulcrum <b>4</b>, The angle γ between the track of fulcrum <b>1</b> by fulcrum <b>2</b> and the joint of Point <b>1</b> by fulcrum <b>4</b>, Is the angle between β the distance of hinge point <b>1</b> by fulcrum <b>4</b> and the of fulcrum <b>1</b> by fulcrum <b>3</b>, The angle ε of between the distance from pivot point <b>1</b> by fulcrum <b>2</b> and the hinge point of <b>3</b> by fulcrum <b>4</b>, therefore between the optical axis <b>25</b> of point <b>7</b> by point <b>6</b> and the perpendicular to the template <b>10</b>,

With the choice of length <b>21</b> (L1) equal length <b>22</b> let (L2) the coordinates and angles for example, depending α calculate speed from the angle:

P4x = P2x - L1. cos αP4Y = P2Y + L1. sin αL4 = ((P4Y - P1y)² + (P4x - P1x)²)^1/2s = 0.5. (L1 + L3 + L4)β =. 2 arctan ((((s -. L4) (s - L1)) / (s (s -. L3)))^1/2)γ = arctan ((P4Y - P1y) / (P4x - P1x))P3x = P1x + L1. cos (β + γ)P3Y = P1y + L1. sin (β + γ)P6x = 0.5. (P3x + P4x)P6y = 0.5. (P3Y + P4Y)P7x = P6x + L5. (P3Y - P4Y) / L3P7y = P6y + L5. (P4x - P3x) / L3ε = arctan ((P4Y - P3Y) / (P4x - P3x))

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

An exemplary embodiment of the invention for P5y = 64 represented, with all dimensions exemplified in Millime may be you. To obtain a different size can All dimensions proportionally enlarged by the same factor or be reduced. L1 and L2 are thus usually so selected such that the hinge points 1 and 2 behind the pre location are so P1y and P2Y are not greater than p5y.

For scanned width to about 80 mm is an execution with the data P2 = (24.80, 0.00), L1 = L2 = L3 = 32.00, P5 = (00:00, 64.00) favorable with respect to mechanical stability. There he adopt L5 = 94.77.

In Table 1, the angle α are values ​​for certain resulting profit figures shown, the resolu- sung the representation of the values ​​in the table at the Koor coordinates of the point <b>7</b> 1/100 mm was chosen during the coordinates of the other points with 1 mm resolution are provided to roughly the position of the points to describe.

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

<b>Fig.</b> 2 shows the V-shaped profile of the point <b>6</b> in front standing dimensioning, but in another dimension rod as <b>Fig.</b> 1. Would the optical axis, the centers position of the line sensor <b>13</b> selected, so would the Ausdeh tion of the V-shaped web is less in the X direction, in Y direction pronounced.

<b>Fig.</b> 3 shows the resulting path of the point <b>7</b>, the ideally would on a straight line, with the Y coordi th are shown ten times too high, because otherwise viewed with respect to the Y-coordinate of the point <b>5</b> resulting devia tions would hardly be seen in FIG.

In one embodiment of the invention is achieved, a Core sampling with very high precision Illustration of template <b>10</b> on the line sensor <b>13</b> and egg take part in such area, at the subsequent border area with lower demands on the precision of the imaging template <b>10</b> on the line sensor <b>13</b> to realize where the edge region at the scan to acquire coarser Structures of the template <b>10</b>As edge detection or Description of the template coarsely coded data is used, sampled during the core area with full resolution becomes. In the illustrated example, the core region includes an area for P7x from -32.2 mm to +32.2 mm with P2Y of -64.11 -64.00 Mm to mm, while the edge area a 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 the SEM is the case for positioning the template <b>10</b> authoritative position of the point <b>5</b> optimally at P5x from 64.05 mm to 64.06 mm, whereby the distance of the point <b>7</b> of the presentation <b>10</b> in the core area less than 0.06 mm remains and Chebyshev characteristics, including during it does not exceed 0:16 mm in the edge region.

Typical line sensors <b>13</b>Such as SONY ILX503A, have a line length of 2048 pixels, so-called Pixels, a pixel with a size of 14 microns and Grid spacing of 14 microns. When the line sensor to erfas send line length of a perpendicular to the plane <b>27</b> extending Line the original 20:48 mm, this results in up linear image by the optics <b>11</b> a necessary Magnification of 1.4 or one on the template <b>10</b> related pixel size of 10 microns by 10 microns with a grid distance of 10 microns.

The <b>Fig.</b> 4 provides a reference plane of the <b>Fig.</b> 1 senk right section in the points <b>6</b> and <b>7</b> a configuration of the invention. A comparatively long line sensor <b>13</b>Which in this example an external mechanical length of about 42 mm and a line length of 2048 by 14 microns, ie 28,672 mm has, can be accommodated as space saving. In the<b>Fig.</b> 4 is the light-sensitive part of the Zeilensen sors <b>13</b> shown. It is essential in relation to the template <b>10</b> lateral displacement of the optics <b>11</b> and the United use a mirror <b>12</b>, The dimensions shown he give when the optics <b>11</b> with a focal length of 12.5 mm, a diameter of 9.5 mm and a distance of principal planes <b>17</b>. <b>18</b> is used by 1.8 mm. The rays gear is shown in international customary manner. Ent Talking is in Horst Czichos (ed.): Cottage - The reason lay in engineering, 29th edition, Berlin et al .: Springer-Verlag, 1989, ISBN 3-540-19077-5, S. 220 ff to find.

In <b>Fig.</b> 5 is the view of the reference plane of the <b>Fig.</b> 1 with in <b>Fig.</b> 4 illustrated embodiment for a arbitrary angle α seen. By combining Displacement and rotation of the relative to the template <b>10</b> movable optical carrier with the optical parts <b>11</b>, Spie gel <b>12</b> and line sensor <b>13</b> is compared to a narrower parallel to the original guide this mechanism to achieve design of the entire scanner head without the angle between the template <b>10</b> and the optical axis <b>25</b> as far deviates from the right angle, as in pure Dre increase the optics if for this the axis of rotation not of the presentation <b>10</b> should be removed, as it arthrocentesis the th <b>3</b> and <b>4</b> or in its largest distance at α = 90 ° β + γ = 90 °.

In <b>Fig.</b> 5 is also shown that the mirror <b>12</b> trapeze is shaped, as the one for the Figure Line on the line sensor <b>13</b> effective light beam having to nehmendem distance from the optics <b>11</b> rejuvenated.

In the <b>Fig.</b> 4 and 5, is a relatively small focal length, based on the line length of 20:48 mm template, Darge provides. It can on the one hand the characterizing measures that laying down the points <b>1</b> to <b>7</b> lead, all in the same Ratio be reduced until the scanned Vorla this keeps to reach the maximum allowable distance between the original and the point <b>7</b> leads. Second the focal length of the optics <b>11</b> increased and the positioning ordination of optics <b>11</b>, Mirror <b>12</b> and line sensor <b>13</b> inventions be adjusted in accordance with training.

In <b>Fig.</b> 6, the optical terms used Darge provides. So the object to be imaged G is the Op tik <b>11</b> displayed in the image B, where the distance between the object G and the first principal plane <b>17</b> as a counter distance g, defined between the second principal plane <b>18</b> and the image B as image distance b and between the two principal planes <b>17</b> and <b>18</b> called the principal plane distance h becomes. For simplification, it takes between the two main flat <b>17</b> and <b>18</b> the beams as the optical axis paral lel constantly on, the line through the optical axis the two foci <b>8th</b> and <b>9</b> is looked at. When geo metric optics it does not come to the diameter of the Op tik <b>11</b> , so that the construction of the figure from the opposite stood for image displaying the Strahlenbün involved del has no importance. An illustration in the Gaussian sense geometrical optics provides an approximate consideration is sufficient to explain the invention, for PRÄZI sen calculation of optimal solutions but not sufficient is not because they, for example, diffraction effects taken into account, in which the diameter of the optic <b>11</b> a plays essential role.

An essential advantage of the invention lies in that optics <b>11</b>, Mirror <b>12</b> and line sensor <b>13</b> in a rigid optics carrier <b>16</b> be mounted and adjusted, if necessary can, of in the hinge points <b>3</b> and <b>4</b> of the four- gon <b>28</b> respective axes is stored.

In <b>Fig.</b> 7 is the Bezier curve for determination of the measure L3 m, which for performing the method according to the invention to calculate the length <b>23</b>Called L3, is required, graphed. With the given data, the Determining in well-known fashion and mathematically be performed.

For a description of the inventive method basically Festge without loss of generality sets:

P1y = P2Y = P0y = 0P1x = -P2x with P2x &lt;0P5x = 0L1 = L2

It may at first the reference measurement <b>33</b>, Ge in formulas L0 called, are determined that the maximum extension Inventive device between template <b>10</b> and bar linkage <b>28</b> with respect to the Y-axis <b>30</b> the coordinates system corresponds.

It may be the distance of the origin p5y <b>0</b> and Thus the fixed pivot points <b>1</b> and <b>2</b> of the presentation <b>10</b> be selected, one of the template <b>10</b> close as possible Location gives a particularly wide scan field.

Thus, the lengths result <b>21</b> (L1), <b>22</b> (L2) of the first and second movable arm <b>14</b>. <b>15</b> to

L1 = L2 = L0 - p5y.

The possible scanning width of the Template <b>10</b> results by itself the members of the required accuracy of the maximum value Deflection of the point <b>7</b> in the X direction P7x (max), for the the distance from the template <b>10</b>So | P7y - p5y |, this is exactly accuracy corresponds to twice of P7x (max). P7x (max) can be estimated:

P7x (max) ≈ L0. (0.58333 - 0.175 p5y / L0 -.. 0:18 (p5y / L0) 2)

It may be the situation P1x, P2x of two fixed pivot points <b>1</b>. <b>2</b> of the four-bar linkage <b>28</b> to get voted. The larger the value P2x is selected, the higher the strength and Insensitivity to small deviations, the wider but also the required total for the establishment Extension in the direction of the X axis <b>29</b> the Koordinatensy stems. Furthermore, the following limit applies:

P2x (max) = L0. (1.16666 - p5y / L0)

The length <b>23</b>, In the formulas L3 called, of a third movable rectangle side corresponding optics carrier <b>16</b> is determined in the following steps:

<ul><li>a) Xx = P2x / L0</li><li>b) Vxx = 0.66585 - 4.2054. Xx + 5.6624. Xx2 - 3.8695. xx3</li><li>c) Vy = 0.19421 - 0.95048. Xx + 0.02057. Xx2 + 0.3072. xx3</li><li>d) V = 0.9264 +0.87303. Xx - 2.6595. Xx2 + 0.811. xx3</li><li>e) L1 = m (L1 / L0 + Vxx). V</li><li>f) In the points(-0.1625, 0.3)(-0.13125, 0.46458)(0.01146, 0.25625)(1.0, 0.2151)certain Bezier curve of the two dimensions L1 m, L3 m of belonging to L1 m value is determined L3 m.</li><li>g) L3 = L0. (L3 m - Vy)</li><li>h) be viewed by point with L3 <b>7</b> resulting Coordinate P7x, P7y for different angle α calculated, where appropriate, of to be considered for manufacturing tolerances the positions of the pivot points <b>1</b>. <b>2</b>. <b>5</b> and lengths <b>21</b>. <b>23</b>. <b>24</b> the movable linkage sides <b>14</b>. <b>15</b>. <b>16</b> of the four-bar linkage <b>28</b>And L3 slightly corrected as length <b>23</b> used.</li></ul>

Using the example of the interpretation of the scanner head with a Scan width of 60 mm, the process is following Darge provides. 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. L1 results to about 45 mm, Xx to 0.41667, Vxx to -0.38326, Vy -0.17603 And V to 0.88711. Thus L1 m calculated to 0.32534. In the Bezier curve can to L3 m to 0.2782 read off. L3 This results to 27.2538 mm. A Nachprü tion with fine optimization results for a scan width of 60 mm corresponding to a value for P7x of 30 mm maximum Difference | P7y - p5y | of 87.5 microns at a Ver shortening of L3 to 6:27 per thousand to 27,083 mm. This is Angle α to 92.1 degrees off controlled, the optical axis he reaches an inclination ε for submission <b>10</b> of 14.8 degrees. Thus is the optical axis in the peripheral regions through the point (<b>26</b>. <b>0</b>); the bearing of the second fixed pivot point<b>2</b> allowed ie not between the area of ​​the effective light beam rule <b>19</b> and <b>20</b> protrude. This can be achieved that, as in <b>Fig.</b> 5, the hinge points <b>1</b> and <b>2</b> sufficiently far from the source <b>10</b> removed, and / or be sufficiently positioned in the X direction, or characterized in that the movable linkage sides <b>14</b>. <b>15</b> in voting fork shape their fixed pivot points <b>1</b>. <b>2</b> sufficiently above and below the effective light beam possess.

In <b>Fig.</b> 8 is a section parallel in the Y-axis <b>30</b> and perpendicular to the reference plane <b>Fig.</b> 1 at an α of 90 degrees exemplified as the fixed hinge points <b>1</b>. <b>2</b> belonging stock for the first and second be movable quadrangle page <b>14</b>. <b>15</b> by molding the housing <b>34</b> and to the movable hinge points <b>3</b>. <b>4</b> belonging Bearing between the first and second bewegli chen arm <b>14</b>. <b>15</b> and the third movable rectangle side, the optics carrier <b>16</b> by a hinge pin <b>35</b> educated can be.

With a focal length of the optics <b>11</b> of 12.5 mm and a Magnification of 1.4 results in an object distance of 21:43 mm. At an effective diameter of the optic<b>11</b> from 8 mm results in an opening angle of a line from continuous effective light beam of arctan (0.5. 8 mm / 21:43 mm) = 10.6 degrees. The image distance is found to be 30 mm, the Publ opening angle corresponding to 7.6 degrees. With a maximum ε of 14.8 degrees thus remains on the object side, a Be range of 4.2 degrees freely, on the image side, a range of 19 degrees, so that the internal cross section of the housing <b>34</b> in the reference plane <b>Fig.</b> 1 with decreasing y coordinate not must increase, but to the optics <b>11</b> easily and thereafter may decrease significantly.

For the lighting is to ensure that the Winkelver change of the optical axis with respect to the template <b>10</b> of ± ε no substantial change of the original brightness and not through the lens <b>11</b> recorded reflection causes. For this purpose, the opening angle of the light beam of the keep lighting device small enough and the Light beam against the bill in a favorable Winkelbe rich to keep inclined.

In <b>Fig.</b> 9 is shown how a light beam for lighting tion, the optics <b>11</b> for focusing on the template shared, using a plurality of, in the illustrated Example two mirrors <b>37</b>. <b>38</b> can be performed. The drawn boundary <b>39</b> the light beam is a special to consider DERS wide beam including the tolerances of the mirror <b>37</b>. <b>38</b> is that in the by the maximum value of the angle ε of the optical axis <b>25</b> with respect to the template <b>10</b> caused maximum Nei pension of the optical axis <b>36</b> the light beam with respect to the template <b>10</b> upon reaching the template <b>10</b> by the light bunch is.

In <b>Fig.</b> 10 shows which angle range since union limits <b>19</b>. <b>20</b> the effective light beam of the template <b>10</b> through optics <b>11</b> the line sensor <b>13</b> in front Reaching the optics <b>11</b> cover. This area is of of the template <b>10</b> reflected radiation of light bundle of lighting in <b>Fig.</b> 8 kept.

It can be clearly seen that in a relatively large Diameter of the optic <b>11</b> Although a large angle of Strah treatment as an effective light beam is detected, but also the border the feasibility is achieved. In another Substituted design of the invention, the inside diameter of the optic <b>11</b> derogation determined by the circuit, for example in the form of a Rectangle, wherein the long side parallel to the row ver runs. This may in the<b>Fig.</b> 9 and 10 dargestell th light beams are narrowed and the Lichtbün del lighting steeper strike the template. at a diameter of the optic <b>11</b> of 8 mm results in an opti shear cross-section of 50 mm²In a rectangle of 8 mm. 4 mm a cross section of 32 mm², Ie from 64 percent at a Reduction in the angle by half, while at 4 mm Diameter would only have been 25 percent. As the border Narrowing should observe the diffraction limit will.

Through proper selection of the inclination of the mirror <b>37</b> and <b>38</b> it can be achieved that the levels relatively close to the lateral boundaries <b>19</b>. <b>20</b> the effective Lichtbün dels can be arranged and thus the dimensions of the housing <b>34</b> in the direction of the X-axis <b>29</b> in the region between template <b>10</b> and optics <b>11</b> can be kept small.

In order to generate the light beam of the illumination light are emitting diodes, called LEDs, suitable. Uses man diese auf der vorlagenfernen Seite der Optik <b>11</b> with ge compared with the optical axis <b>25</b> optics <b>11</b> twisted and / or simultaneous optical axis <b>36</b>So you can through proper positioning of the LED and through the choice of focal wide, position and orientation of a cylindrical lens in reach the beam path of the beam of light, that the image of the light emitting surface of the LED on the template <b>10</b> as a bright line or narrow beam the ERS forming line illuminated. Using multiple LEDs can also with a common cylindrical lens to increase serve the light intensity and / or to equalize.

In the <b>Fig.</b> 8 illustrated using two mirrors <b>37</b>. <b>38</b> can be extended bilaterally symmetrical. additionally the two mirrors <b>37</b>. <b>38</b> on each of both Be th positioned and extended that from a can be common bruised component. This is simultaneously achieved in that for a penetration of Ambient light in the optical area under largely presses is that the second case of composite of the two mirrors combinations <b>37</b>. <b>38</b> with a base and / or cover plate the third movable rectangle side, optics carrier <b>16</b> in designed as a mechanically stable movable part can be.

In one embodiment, the mirrors <b>37</b>. <b>38</b> also ge be curved, depending on the configuration even without a Buckling, but with shifting transition, so that only a Mirror on each side can be seen. Thus a Zy cylinder lens omitted.

Comparing the results of the invention with recent Solutions are obtained compared to linear moving Op tik a simplified mechanism with a reduction of necessary housing width. Compared to pure Rotatori shear scan with the same scanning angle and therefore a Radius of about 100 mm, a planar template used who the while there deflection of about 4 mm no longer would be neglected, and also a significant Ver kleinerung the housing width and length can be obtained since during a scanning of the original <b>10</b> simultaneously Nei movement and displacement of the optics <b>11</b> be made.

LIST OF REFERENCE NUMBERS

<b>0</b>

Origin P0 (P0x, P0y)

<b>1</b>

(First) fixed pivot point P1 (P1x, P1y)

<b>2</b>

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

<b>3</b>

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

<b>4</b>

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

<b>5</b>

Center P5 (P5x, p5y) of the template

<b>10</b>

<b>6</b>

Center P6 (P6x, P6y) of the optics carrier

<b>16</b>

<b>7</b>

imaged point P7 (P7x, P7y)

<b>8th</b>

first focus of the optics

<b>11</b>

<b>9</b>

the second focus of the optics

<b>11</b>

<b>10</b>

template

<b>11</b>

optics

<b>12</b>

mirror

<b>13</b>

line sensor

<b>14</b>

first arm

<b>15</b>

second arm

<b>16</b>

optics carrier

<b>17</b>

first principal plane of the optic

<b>11</b>

<b>18</b>

second principal plane of the optic

<b>11</b>

<b>19</b>

.

<b>20</b>

lateral boundaries of the effective light beam

<b>21</b>

Length L1 of the first arm

<b>14</b>

<b>22</b>

Length L2 of the second arm

<b>15</b>

<b>23</b>

Length L3 of the optics carrier

<b>16</b>

<b>24</b>

V-shaped web

<b>25</b>

optical axis

<b>28</b>

bar linkage

<b>29</b>

X-axis of the coordinate system

<b>30</b>

Y-axis of the coordinate system

<b>31</b>

distance L5

<b>33</b>

Reference dimension L0

<b>34</b>

housing

<b>35</b>

bearing pin

<b>36</b>

optical axis of illumination

<b>37</b>

.

<b>38</b>

lighting levels

<b>39</b>

lateral boundaries of the light beam of the illumination