JP3036090B2 - Position adjustment method of reading sensor in image reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a reading sensor assembly constituted by fixing a sensor substrate, on which a reading sensor is directly mounted, within a predetermined precision with respect to a base plate in advance and then fixing the same. And a method for adjusting the position of a reading sensor in an image reading apparatus.

[0002]

2. Description of the Related Art Conventionally, digital copying machines, image scanners, facsimile machines and the like use a digital reading device for reading an image of a document by a reading sensor. In this digital reading device, for example, a CCD (Charge Coupled Device) is used as a reading sensor, and the density of a document image is converted into a level of an electric signal.

FIG. 18 is a diagram schematically showing an example of an optical system of an image scanner portion of a copying machine using a digital reading device. As shown in FIG. 18, in the optical system of the image scanner portion of the copying machine, reflected light from a document (not shown) placed on a document placing table 01 is reflected by mirrors 02, 03, 04 and an optical lens 05. An image is formed on the reading sensor 06. Then, the reading sensor 06 is extended in the main scanning direction, and the mirrors 02, 03, 04 and the optical lens 05 are moved in the sub-scanning direction while satisfying the imaging conditions while simultaneously scanning the lines of the original in the main scanning direction. To scan the entire surface of the document.

When such an optical system is developed on the same plane as shown in FIG. 19, the image of the original on the original table 01 is reduced to 1 / N (N: magnification) by the optical lens 05. An image is formed on the reading sensor 06. The reading sensor 06 is attached to the copying machine body via a sensor plate or the like. In this case, if the reading sensor 06 is not accurately attached to a predetermined attachment position, a particularly good resolution MTF is provided.
(Modulation Transfer Function) The reading of the original image may not be accurately performed due to reasons such as the inability to obtain the characteristics, and the reading sensor 06 must be accurately mounted at a predetermined mounting position.

For this purpose, it is necessary to adjust the mounting position of the reading sensor 06 with high precision, and to mount the reading sensor 06 at the predetermined mounting position as accurately as possible. A conventional read sensor mounting position adjusting device mounts a sensor substrate on which a read sensor is mounted on an adjustment base plate, and attaches the adjustment base plate to two sensor middle plates on a sensor plate fixed to the copying machine body. Via a three-dimensional direction and a rotational direction thereof. Then, the position adjustment is performed by moving the adjustment base plate and the adjustment middle plate in each direction by the respective adjustment screws. When actually adjusting the position, the reference pattern is read by the reading sensor, the video signal from the reading sensor is supplied to the oscilloscope, and the waveform of the video signal is checked while finely adjusting each adjustment part. The reading sensor is positioned with respect to the surface reference position.

However, this position adjusting device has a problem that the structure is complicated, the number of parts is large, the cost is high, and the adjusting method is complicated, so that it takes a long time to adjust. In particular, the position adjustment is usually performed at the time of shipment at the factory, but it is necessary to adjust the position also at the sales destination. Therefore, the position adjustment device as described above should sufficiently cope with such position adjustment of the sales destination. Can not.

In view of this, a sensor substrate to which a reading sensor is directly attached is fixed after a sub-adjustment of the position within a predetermined accuracy with respect to the base plate in advance to form a reading sensor assembly. An image reading apparatus that solves the above-mentioned problem by attaching the position to a reading optical system so as to be adjustable is proposed in Japanese Utility Model Laid-Open Publication No. Hei 2-2-1. According to this image reading device, when the reading sensor or the sensor substrate fails at the sales destination, the reading sensor can be attached with high accuracy only by replacing the reading sensor assembly.

[0008]

However, in the image reading apparatus disclosed in this publication, the adjustment of the reading sensor in the optical axis direction is not performed in the assembly. When the sensor assembly is mounted, it must be performed by adjusting the position of the reading sensor assembly in the optical axis direction. For this reason, the mounting of the reading sensor assembly becomes troublesome, and in particular, it may take a long time to replace the reading sensor assembly at the sales destination.

Further, since the sub-adjustment of the position of the sensor substrate is usually performed using an optical lens, it depends on the performance of the optical lens. Thus, if the performance of the lenses used for the adjustment is different, the read sub-adjusted position sensor assembly will all have different performances.
For this reason, it is extremely difficult to adjust the performance of a large number of read sensor assemblies while reducing the variation in their performance. If the reading sensor is not adjusted with a predetermined accuracy, the performance of the lens such as the MTF greatly changes, for example, when the reading sensor assembly is attached or replaced at a sales destination. Therefore, when the reading sensor assembly is mounted or replaced, the read sensor assembly must be adjusted again, and the mounting and replacement of the reading sensor assembly cannot be easily performed.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to reduce the variation in adjustment of the reading sensor in the reading sensor assembly as much as possible and to provide a reading sensor assembly having substantially uniform performance. It is an object of the present invention to provide a method for adjusting the position of a reading sensor in an image reading apparatus capable of producing a large number of images.

[0011]

In order to solve the above-mentioned problems, the present invention is directed to a sensor board on which a reading sensor is mounted within a predetermined accuracy with respect to a reference of a base plate. The reading sensor assembly is configured by sub-adjusting the position of the reading sensor and mounting the reading sensor assembly on the base plate, and the reading sensor assembly is provided in the reading optical system. The sub-adjustment of the position is performed by using a jig lens having the same performance as the optical lens of the image reading apparatus. Since the adjustment is performed by the jig lens having the same performance as described above, the adjustment is simplified, the variation in the adjustment is reduced, and a large number of read sensor assemblies having substantially uniform performance can be manufactured.

According to a second aspect of the present invention, a plurality of jig lenses having the same performance are provided as jig lenses, and the sub-adjustment of the position of the sensor substrate is performed using the plurality of jig lenses. I have to. As a result, even more read sensor assemblies having substantially uniform performance can be manufactured.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of an image reading apparatus according to the present invention, and FIG. 2 is a side view of the embodiment. In this embodiment, a case where the present invention is applied to a color copying machine will be described as an example.

As shown in FIGS. 1 and 2, a reading sensor 2 and an optical lens 3 are provided on a base plate 1, and this base plate 1 is composed of a pair of frames 4 extending parallel to the sub-scanning direction of the main body of the color copier. , 5 and is adjusted in the sub-scanning direction, that is, in the optical axis direction (x-axis direction) by screws (not shown) penetrating two pairs of long holes 6, 7, 8, 9 provided on both side edges. It is designed to be attached as possible.

As shown in FIG. 3, the reading sensor 2 has pixel rows 2a, 2b and 2c formed by color filters having respective spectral sensitivities of red (R), green (G) and blue (B). The sensor is formed as a three-line sensor, and is attached to the sensor substrate 10 as shown in FIGS. The sensor substrate 10 is composed of two mounting screws 11 and 12, adjustment stud screws 13 and 14, and mounting adjustment nut 15,
A reading sensor assembly 18 is configured by being attached to a mounting base plate 17 by 16. The mounting of the sensor substrate 10 and the mounting base plate 17 will be described in more detail. As shown in FIG. 6, the sensor substrate 10 has a mounting screw 11 penetrating therethrough and having a diameter larger than the outer diameter of the mounting screw 11. Hole 19 and FIG.
As shown in the figure, holes 20 and 21 for position adjustment are respectively formed. Although not shown, a hole similar to the hole 19 through which the mounting screw 12 penetrates is formed in the sensor substrate 10.

As shown in FIGS. 7 and 8, a hole 22 for transmitting an optical image from the optical lens 3 is formed substantially in the center of the mounting base plate 17, and a stud fitting mounting hole is provided. 23 and 24 are provided. Studs 25 and 26 are fitted and fixed in the stud fitting mounting holes 23 and 24, respectively. As shown in detail in FIG. 6, the stud 25 is formed in a cylindrical shape having a hole 27 through which the adjusting stud screw 13 slidably passes, and a flange 28 is formed on the outer periphery thereof. One surface of the flange 28 is in contact with the inner surface of the mounting base plate 17, and the stud 25 is fixed to the mounting base plate 17. The stud 26 is similar to the stud 25. Further, the mounting base plate 17 has through holes 3 for mounting screws 30, 31 (shown in FIG. 1) for mounting the mounting base plate 17 to the third adjustment plate 29 as described later.
2, 33 are drilled, and holes 34,
35 are provided.

Further, a flange 36 is formed at an upper end edge of the mounting base plate 17, and the rigidity of the mounting base plate 17 is increased by the flange 36. As shown in FIG. It extends so as to cover a part between the plate 17 and the sensor substrate 10, thereby preventing disturbance light and foreign substances such as dust from entering the reading sensor 2.

In order to assemble the reading sensor assembly 18, first, in FIG. 6, the adjustment stud screw is mounted with the spring 37 contracted between the flange 28 of the stud 25 and the head 13 a of the adjustment stud screw 13. 1
3 is passed through the hole 27 of the stud 25, and is attached to the stud 25 by the attachment adjusting nut 15. Similarly,
The other adjustment stud screw 14 also has a spring 37 interposed between it and the stud 26 so that the mounting adjustment nut 16
To stud 26. Next, the mounting screw 11 is passed through the hole 19 of the sensor substrate 10 to which the reading sensor 2 is mounted, and the head 13 of the adjustment stud screw 13 is
The sensor substrate 10 is connected to the adjusting stud screws 13 and 14 by screwing the mounting screws 12 into the heads of the adjusting stud screws 14 in the same manner as the female screws formed in the female screw holes formed in the sensor a. Attach.

In this case, before the sensor substrate 10 is fixed to the adjustment stud screws 13 and 14, the position of the sensor substrate 10 is adjusted in advance.
As shown in FIG. 9, a jig lens 3a is prepared. As the jig lens 3a, the same lens as the optical lens 3 or a lens having the same performance as the optical lens 3 is used. That is, in FIG. 10, when the distance between the document table 53 and the jig lens 3a is m, and the distance between the jig lens 3a and the sensor surface 2a of the reading sensor 2 is n, the ratio of m: n is The same jig lens 3a as that of the optical lens 3 is manufactured. Then, as shown in FIG. 9, light from the jig lens 3a is received by each of the line sensors 2a, 2b, 2c for each of R, G, and B, and the output of these line sensors 2a, 2b, 2c is output to an oscilloscope ( (Not shown).

In adjusting the position of the sensor substrate 10, first, the skew adjustment of the sensor substrate 10 is performed. That is, the reference of the mounting base plate 17 (for example, the through holes 32 and 33)
16), the relative position of the sensor substrate 10 in a direction other than the optical axis direction (x-axis direction), that is, the y-axis direction and the z-axis direction in FIG. After that, the sensor substrate 10 is fixed to the adjustment stud screws 13 and 14.
This position adjustment is performed by using a sub-adjustment jig disclosed in Japanese Utility Model Laid-Open Publication No. Hei 2- (1995), and fitting the sub-adjustment jig pins into the position adjustment holes 20, 21, 34, and 35 to disclose the position adjustment. It can be done with the adjustment method that is being done. Therefore, description of the position adjustment is omitted.

Next, adjustment in the direction of the optical axis, that is, adjustment of the MTF is performed. In this case, the same color as the color of the line sensor 2b at the center (the G line sensor in the present embodiment) of the three line sensors constituting the reading sensor 2, that is, a jig for G in the present embodiment The position adjustment of the sensor substrate 10 in the optical axis direction is performed so that the center line sensor 2b is located at the peak position of the MTF characteristic curve of the lens 3a. Actually, in performing this adjustment, the attachment adjustment nuts 15 and 16 are appropriately rotated to make the reference of the attachment base plate 17 (for example, the outer surface 17a of the attachment base plate 17 can be used as the reference surface). ),
The position of the sensor substrate 10 in the optical axis direction (x-axis direction) is adjusted with a predetermined accuracy. In this case, since the adjustment is performed in the x-axis direction by the adjustment stud screws 13 and 14 and the mounting adjustment nuts 15 and 16, fine adjustment is possible. Then, the play between the stud 25 and the adjusting stud screw 13 is absorbed by the springs 37 and 38 and the loosening is prevented, and the position of the sensor substrate 10 in the optical axis direction is securely held at the adjusted position. You.

Thus, the sensor substrate 10 is mounted on the mounting base plate 1.
The reading sensor assembly 18 which is sub-adjusted in advance in the x-axis direction, the y-axis direction, and the z-axis direction with respect to the reference 7 is configured. Then, by performing skew adjustment first and then performing MTF adjustment in position adjustment, there is an advantage that the previously adjusted skew does not change even after MTF adjustment.

As another MTF adjustment, the position can be adjusted according to the MTF characteristics of the optical lens. As shown in FIG.
Has the highest peak value of the MTF curve of G,
Next, the peak value of the MTF curve of B is high, and the MTF of R is high.
The peak value of the curve has the lowest characteristic. The position of the line sensor of the same color as the color is adjusted to the peak position of the MTF curve of any one of these colors R, G, and B. Thereby, the MTF adjustment of the sensor substrate 10 becomes easy. In particular, the peak value of the G MTF curve is the highest,
That is, since the output is the largest, the G line sensor 2b
By adjusting the position of the sensor substrate in accordance with the position, the position adjustment becomes more accurate and easier,
Position adjustment accuracy is improved.

As described above, the use of the jig lens 3a makes the adjustment extremely easy, and has substantially uniform performance without unevenness in the adjustment. That is, in FIG. 10, the sensor surface of the reading sensor 2 of the mounting base plate 17 in FIG. Distance p from 2a
Can form a substantially constant reading sensor assembly 18 in large quantities. Then, by manufacturing a plurality of such jig lenses 3a, it is possible to form the read sensor assembly 18 having substantially uniform performance in a much larger and simpler manner.

In the present embodiment, an adjustment margin A is provided between the stud 25 and the adjustment stud screw 13 to enable position adjustment in the optical axis direction. In FIG. 6, the size e of the adjustment margin A is determined as follows. That is, a is a tolerance due to a manufacturing error of the plate thickness t ₁ of the mounting base plate 17, and b is a flange 2 of the studs 25 and 26.
8 tolerance from the mounting base plate 17 side due to a manufacturing error of length t ₂ to the substrate 10 side edge sensor for tolerances caused by manufacturing errors of the thickness t ₃ of the head 13a of the adjusting stud screw 13 c,
d from the surface of the sensor element of the reading sensor 2 to the sensor substrate 1
Assuming a tolerance due to a manufacturing error of the length t ₄ to 0, | a
+ B + c + d | ≦ e. That is,
Adjusting margin A is theoretically calculated tolerances due to manufacturing error of each member of the reading sensor assembly 18, it is set by adding a numerical spectral axis of the basic adjusting amount t ₅ obtained by calculation. By setting the adjustment margin in this way, it is possible to prevent problems such as inability to adjust or excessive adjustment. The studs 25 and 26 are provided by providing the adjustment margin A.
The play between the springs 37 and 38 is also absorbed by the springs 37 and 38, respectively.

Sensor substrate 10, ie, reading sensor 2
Sensor assembly 18 whose position has been pre-adjusted
Is a position adjusting and mounting device 39 as shown in FIGS.
Thus, the base plate 1 is attached to the base plate 1 so as to be position-adjustable in the y-axis direction, the z-axis direction, the rotation direction around the x-axis (shown in FIG. 17), and the rotation direction around the z-axis (the same). In that case, in the state where the reading sensor assembly 18 is adjusted and attached, the green G pixel row 2 of the reading sensor 2 is mounted.
b comes to be located exactly on the optical axis of the optical lens 3. As shown in FIGS. 12 and 13, the position adjusting / mounting device 39 includes a third position for mounting the reading sensor assembly 18.
An adjusting plate 29, a first adjusting plate 40 attached to the base plate 1, and a second adjusting plate 41 interposed between the first and third adjusting plates 40 and 29.
It has.

As shown in FIG. 1, the first adjustment plate 40
Is in the main scanning direction, ie, y, at the right end of the base plate 1.
The first adjustment plate 40 is provided with a pair of flange portions 40a, 40a formed at both ends thereof. The flange portions 40a, 40a are connected to the base plate 1 by a pair of screws 42, 42. Attached to. An elliptical adjustment hole 40b extending in the main scanning direction (y-axis direction) is formed in one flange portion 40a of the first adjustment plate 40 (shown clearly in FIG. 12). As clearly shown in FIG.
And an eccentric cam 43 is provided therethrough. A rotating shaft 43a of the eccentric cam 43 is rotatably supported by a bush 44 fitted and fixed in a hole of the base plate 1, and a part of the cam surface 43b has a hole of an adjusting hole 40b as shown in FIG. It comes into contact with the wall. Further, the eccentric cam 43 is provided at its upper end with a knob 43c for rotating the cam 43.

As shown in FIG. 1, the first adjusting plate 40 is rotatably supported on the base plate 1 at a substantially central support portion 40e. Therefore, knob 4
By rotating the eccentric cam 43 by pinching the 3c, the first adjustment plate 40 moves the cam surface 43 around the support portion 40e.
It turns by an angle corresponding to the turning amount of b. In this case, as shown in FIG. 12, the through hole 40c of the screw 42 in the flange portion 40a is formed in an oblong shape, and allows the first adjustment plate 40 to rotate. The contour curve of the cam surface 43b of the eccentric cam 43 is
It is preferable to set it appropriately in accordance with the required amount of rotation of the first adjustment plate 40.

A second adjustment plate 41 is fixed to the first adjustment plate 40. As shown in FIGS. 2 and 13, the fixing is performed by passing a pair of screws with spring washers 45, 45 through a pair of holes 41 a, 41 a formed in the second adjustment plate 41, and then fixing the first adjustment plate. 4
This is done by screwing it to zero. In that case, screw 4
A pair of holes 41a, 41a through which the holes 5, 45 penetrate are oblong holes extending in the main scanning direction (y-axis direction). As shown in FIGS. 1 and 12, the second adjustment plate 41 has a flange portion 41b extending in the sub-scanning direction x at an upper edge of one end thereof. , An oval adjustment hole 41c is formed. As clearly shown in FIG. 15, an eccentric cam 46 is provided through the adjustment hole 41c. This eccentric cam 4
6 is rotatably supported by a bush 47 fitted and fixed in a hole of the flange portion 40f of the first adjustment plate 40, and a part of the cam surface 46b is formed in the hole wall of the adjustment hole 41c. It comes into contact. Further, the eccentric cam 46 is provided at its upper end with a knob 46c for rotating the cam 46.

Therefore, by turning the eccentric cam 46 by pinching the knob 46c, the second adjustment plate 41 is moved in the main scanning direction (y-axis direction) by an amount corresponding to the amount of rotation of the cam surface.
To move to. In that case, the movement in the y-axis direction is allowed by the long hole 41a. Similarly, the contour curve of the cam surface 46b of the eccentric cam 46 is preferably set appropriately in accordance with the required movement amount of the second adjustment plate 40.

Further, the third adjustment plate 29 is fixed to the second adjustment plate 41. As shown in FIGS. 2 and 13, the fixing is performed by inserting a pair of screws 48, 29 into a pair of oval holes 29 a, 29 a formed in the third adjustment plate 29.
This is performed by screwing into the second adjustment plate 41 after passing through. In that case, a pair of holes 29a, 2
The gap between the screw 9a and the screws 48 is set to have a predetermined size. As will be described later, even if the third adjustment plate 29 is moved by the rotation of the eccentric cam 50, the screws 48 and 4 fixed to the second adjustment plate 41 are used.
Since the position of 8 does not change, this gap is needed to allow its movement. In that case, in order to secure a necessary gap, the dimension of the hole 29a becomes close to the bulk diameter of the screw 48, so that it is impossible to sufficiently fix it. Therefore, in this embodiment, as shown in FIGS. 2 and 13, the flat plates 49, 49 are arranged between the screws 48, 48 and the third adjusting plate 29, and how the eccentric cam 50 described later is turned. Even so, it can be stably fastened.

As shown in FIG. 16, the third adjusting plate 29 is provided with a circular adjusting hole 29b and an elliptical adjusting hole 29c extending in the main scanning direction. As shown in FIG. 5, a pair of eccentric cams 50 having the same shape are provided through these adjustment holes 29b and 29c. The rotation shaft 50a of the eccentric cam 50 is
The cam surface 50b is rotatably supported by a bush 51 fitted and fixed in the hole of the adjustment hole 26.
b, 29c. Further, the eccentric cam 50 is provided at its upper end with a knob 50c for rotating the cam 50. On the other hand, as shown in FIG. 16, a leaf spring 52 is provided between the pair of eccentric cams 50 and the third adjustment plate.

By rotating the eccentric cam 50 by pinching the knob 50c, the third adjustment plate 29 is moved in the main scanning direction (y-axis direction) and in the vertical direction (perpendicular to the paper) by an amount corresponding to the amount of rotation of each cam surface. (In the direction of rotation; z-axis direction) and rotate around the optical axis (x-axis).

As shown in FIG. 13, the third adjusting plate 2
9 is provided with a pair of half blanks 53 and 54 for positioning. These half blanks 53 and 54 are provided with position adjusting holes 34 and 3 of the mounting base plate 17 in the reading sensor assembly 18.
By fitting 5, the reading sensor assembly 18 is accurately positioned with respect to the third adjustment plate 29. In addition, the half blanking 53, 54 and the position adjusting holes 34, 35
Instead of positioning by the combination of the above, positioning may be performed by the combination of the positioning pin and the position adjusting hole. Further, a screw 45 is attached to the third adjustment plate 29.
Holes 29g, 29g into which a tool for turning the screw 45 is inserted are formed at positions corresponding to.

Further, as shown in FIG. 13, holes 40d, 41e, and 29e for transmitting the optical image from the optical lens 3 are provided at substantially the same positions in the first to third adjusting plates 40, 41, and 29, respectively. They are drilled in approximately the same size. The first to third adjustment plates 40, 41, 29 have flanges 40f, 41f,
29f are formed, and the rigidity of the first to third adjustment plates 40, 41, 29 is increased by these flanges.

On the other hand, as shown in FIG.
The optical lens 3 is attached by a support casing 55 at the center. The support casing 55 includes a lens housing portion 55a for housing and supporting the optical lens 3 and a pair of flange portions 55b, 55b extending from the housing portion 55a. In the flange portion 55b, relatively long oval holes 55c, 55c extending in the optical axis direction (x-axis direction) of the optical lens 3 are formed. The support casing 55 is fixed to the base plate 1 so that the position can be adjusted within the range of α in the optical axis (x-axis) direction by a pair of screws 56 passing through these holes 55c and 55c and being screwed to the base plate 1. You. The reading optical system other than the reading sensor 2 in the present embodiment can be constituted by a conventional general reading optical system shown in FIG.

In the above-described embodiment, the case where the present invention is applied to a color copying machine is described as an example. However, it goes without saying that the present invention can be applied to other image reading apparatuses. In the above-described embodiment, the reading sensor is constituted by a three-line sensor including R, G, and B line sensors. However, the present invention is directed to a reading sensor constituted by a single line sensor for black and white, for example. It goes without saying that the present invention can be applied to a sensor.

[0039]

As is apparent from the above description, according to the first aspect of the present invention, the position of the reading sensor in the reading sensor assembly is determined by using a jig lens having the same performance as the optical lens of the image reading apparatus. Since the sub-adjustment is performed, the adjustment is simplified, the variation in the adjustment is reduced, and a large number of read sensor assemblies having substantially uniform performance can be manufactured.

According to a second aspect of the present invention, a plurality of jig lenses having the same performance are provided as jig lenses, and sub-adjustment of the position of the sensor substrate is performed using the plurality of jig lenses. As a result, it is possible to produce even more read sensor assemblies having substantially uniform performance.

[Brief description of the drawings]

FIG. 1 is a plan view showing a mounting state of a reading sensor and an optical lens used in an embodiment of an image reading apparatus according to the present invention.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a diagram showing a three-line sensor which is a reading sensor of the embodiment.

FIG. 4 is a plan view of a reading sensor assembly according to the embodiment.

FIG. 5 is a side view of the reading sensor assembly according to the embodiment.

FIG. 6 is a partially enlarged sectional view taken along line IV-IV in FIG. 5;

FIG. 7 is a front view of a mounting base plate in the reading sensor assembly.

FIG. 8 is a bottom view of the mounting base plate.

FIG. 9 shows a jig lens and 3 used for position adjustment.
It is a figure showing the relation with a line sensor.

FIG. 10 is an expanded view of the optical system of the present embodiment.

FIG. 11 is a diagram illustrating MTF characteristics for each of R, G, and B of the optical lens.

FIG. 12 is a plan view of the position adjusting and mounting device.

FIG. 13 is a side view of the position adjusting and mounting device.

FIG. 14 is a sectional view showing the eccentric cam and taken along line XIV-XIV in FIG. 1;

FIG. 15 is a sectional view showing another eccentric cam, taken along line XV-XV in FIG. 1;

FIG. 16 shows still another eccentric cam, which is shown in FIG.
It is sectional drawing which follows the XVI line.

FIG. 17 is a diagram showing a position adjustment direction.

FIG. 18 is a schematic view showing an optical system in a conventional general image reading apparatus.

FIG. 19 is an expanded view of the optical system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base plate, 2 ... Reading sensor, 2a ... R line sensor, 2b ... G line sensor, 2c ... B line sensor, 3 ... Optical lens, 3a ... Jig lens, 1
0: sensor board, 13, 14: adjustment stud screw,
15, 16: mounting adjustment nut, 17: mounting base plate, 18
... reading sensor assembly, 25, 26 ... stud, 3
7, 38: spring, 39: position adjusting and mounting device, 5
3,54 ... Half punch

Claims (2)

(57) [Claims] 1. A reading sensor assembly comprising: a sensor substrate to which a reading sensor is mounted; and a sub-adjustment of a position within a predetermined accuracy with respect to a reference of a base plate in advance and mounting the sensor substrate to the base plate. In a method for adjusting the position of a reading sensor in an image reading device in which the reading sensor assembly is mounted in a reading optical system, sub-adjustment of the position is performed using a jig lens having the same performance as the optical lens of the image reading device. A position adjusting method of a reading sensor in an image reading apparatus, characterized in that the method described above is used. 2. The apparatus according to claim 1, wherein a plurality of jig lenses having the same performance are provided as the jig lenses, and the sub-adjustment of the position is performed using the plurality of jig lenses. Item 2. A method for adjusting the position of a reading sensor in the image reading device according to Item 1.