JPH077604A - Device and method for automatically adjusting position of picture reader - Google Patents

Abstract

PURPOSE:To obtain high position adjustment precision without being influenced by deformation and distortion at the time of positioning a small, light and flexible solid-state image pickup element substrate. CONSTITUTION:The automatic position adjustment device of a picture reader consists of more than one adjustment rods 5 for adjusting a position in a direction orthogonal to the optical axis of the image pickup element substrate 1 and an inclination around the optical axis, more than one shift tables 51-53 shifting the adjustment rods 5 in the direction of the optical axis, a shift table 56 shifting the adjustment rods 5 in the direction of the optical axis, more than one screw fasteners 6 which screw-fasten the image pickup element substrate 1, a shift table 61 shifting the screw fasteners 6 in the direction of the optical axis and a control means controlling the operation of the shift tables and the screw fasteners 6. The control means is provided with a means for unfastening the screw of the image pickup element substrate 1 prior to the adjustment of the position by the shift of the adjustment rods 5 for the control means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic position adjusting device and a position adjusting method for an image reading device, and more particularly to an automatic position adjusting device and a position adjusting method for an image reading device which reads an original image using a solid-state image pickup device. It is a thing.

[0002]

2. Description of the Related Art Image reading apparatuses used in digital copying machines and the like often use a method of reading an original image by projecting it on a solid-state image pickup device such as a CCD sensor by an imaging lens. In such a system, since the reduction ratio by the lens is usually set to about 1/4 to 1/10, it is necessary to adjust the position of the solid-state image sensor with high accuracy. The displacement of the solid-state image sensor when releasing the tool is required to be several tens of μm or less.

Conventionally, in general, the solid-state image pickup device substrate is temporarily tightened with respect to the base plate and its relative position is adjusted to reduce the positional deviation of the screw during the final tightening.

However, in such a method of temporarily tightening and adjusting the position, there is a problem that the solid-state image pickup device substrate is deformed by a force applied from the adjusting jig, and a position shift occurs when the adjusting jig is released.

Therefore, the rigidity of the image reading apparatus is increased so that the solid-state image pickup device substrate is not deformed during position adjustment.
It has been proposed to prevent displacement when releasing the adjustment jig. In Japanese Patent Laid-Open No. 3355/1993, the support structure of the solid-state image pickup device is devised to increase its rigidity and prevent its deformation and distortion.

[0006]

However, in such a method, the support structure of the solid-state image pickup device becomes complicated and large, which hinders downsizing, weight reduction and cost reduction of the image reading apparatus.

The present invention has been made in view of such a situation, and an object thereof is to position a compact, lightweight and flexible solid-state image pickup device substrate in which an image signal processing circuit board and a solid-state image pickup device are integrated. At times, it is an object of the present invention to provide an automatic position adjusting device and a position adjusting method that can obtain high position adjusting accuracy without being affected by deformation and distortion.

[0008]

SUMMARY OF THE INVENTION An automatic position adjusting device for an image reading apparatus according to the present invention for achieving the above-mentioned object includes a position in a direction orthogonal to an optical axis of an image pickup device substrate or a tilt around the optical axis. One or more adjusting rods for making adjustments, and one or more moving means for moving the adjusting rods in a direction orthogonal to the optical axis;
Moving means for moving the adjusting rod in the optical axis direction, one or more screw fastening means for fastening the image pickup device substrate with screws, moving means for moving the screw fastening means in the optical axis direction, and these moving means and In an automatic position adjusting device for an image reading apparatus, which comprises a control means for controlling the operation of the screw fastening means, the control means includes means for loosening the screw fastening of the image pickup element substrate prior to the position adjustment by the movement of the adjustment rod. It is characterized by having.

In this case, it is preferable that the control means further comprises means for engaging the adjusting rod with the image pickup element substrate only when the position is adjusted by moving the adjusting rod.

Further, according to the position adjusting method of the image reading device of the present invention, one or more adjusting rods are moved in the optical axis direction of the image pickup device substrate of the image reading device to be engaged with the image pickup device substrate, Loosen the screw to fasten, move the adjustment rod in the direction orthogonal to the optical axis to adjust the position of the imaging element substrate in the direction orthogonal to the optical axis or the inclination around the optical axis, and then tighten the screw. The method is characterized by temporarily tightening, further moving the adjusting rod in a direction opposite to the optical axis direction, and finally tightening the screw after the adjustment is completed.

[0011]

According to the present invention, before moving the image pickup device substrate based on the adjustment command, the screw fastening means is used to loosen the screw fastening of the image pickup device substrate, and after the adjustment is completed, the screws are temporarily tightened. It is possible to prevent deformation and distortion in the alignment direction of the element substrate. In addition, the adjustment rod is inserted before loosening the screw tightening and removed after temporarily tightening the screw, so alignment, focus, and magnification measurement can be performed without being affected by deformation and distortion in the optical axis direction. Can be done.

[0012]

Embodiments of an automatic position adjusting device and a position adjusting method for an image reading apparatus according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view of an image reading apparatus which is an example of an object to be adjusted.
This is the same as the image sensor assembly proposed in Japanese Patent Application Laid-Open No. 93866/1992 and Japanese Patent Application Laid-Open No. 4-252656, which is mounted in a reading optical system after adjusting its position within a predetermined accuracy. First, the configuration of the image reading apparatus 10 will be described. A solid-state image sensor 11 including a CCD sensor is attached to the center of the front surface of the solid-state image sensor substrate 1, and the substrate 1
A signal cable 14 connected to the solid-state image sensor 11 is projected from the back surface of the. At two places on the left and right of the solid-state image sensor substrate 1,
A fastening screw through hole 13 for fastening the substrate 1 to the substrate receiving shaft 24 with a fastening screw 3 described later is provided, and the fastening screw through hole 13 is larger than the diameter of the fastening screw 3. It has a diameter through hole. The board 1 is provided at two positions on the left and right in the vicinity of the fastening screw through-holes 13 and is provided with position adjusting screws 2 to be described later.
The position adjusting hole 12 into which the book adjusting rod 5 is inserted is penetrated. On the other hand, the solid-state imaging device substrate 1 has two substrate receiving shafts 2
Substrate receiving shaft sliding holes 22 are formed at two positions corresponding to the fastening screw through holes 13 of the substrate 1 in the base plate 2 mounted via Position reference holes 21 into which the position reference pins 4 to be described later are inserted are provided at two positions on the right and left sides of the position reference holes.

A substrate receiving shaft 24 connecting the solid-state image pickup device substrate 1 and the base plate 2 has a fastening screw 3 at the end on the substrate 11 side.
Is provided, and a male screw to which a board receiving shaft position adjusting nut 25 is screwed is provided on the opposite side through the board receiving shaft sliding hole 22 at the end on the base plate 2 side. Is a board receiving shaft slide hole 22 of the base plate 2 through a board receiving shaft position adjusting spring 23.
And the nut 25 is screwed on the opposite side of the base plate 2. One end of the spring 23 contacts the base plate 2 portion around the sliding hole 22, and the other end thereof contacts the substrate receiving shaft 24.
Therefore, regardless of the screwing position of the nut 25, the base plate 2 engaging surface of the nut 25 is used as a reference to push the substrate receiving shaft 24 forward. On the other hand, the solid-state imaging device substrate 1 is attached to the base plate 2 via the substrate receiving shaft 24 by screwing the fastening screw 3 inserted into the fastening screw through hole 13 into the female screw of the substrate receiving shaft 24. Before the fastening screw 3 is completely tightened, the diameter of the fastening screw through hole 13 is formed larger than the diameter of the fastening screw 3,
The position can be adjusted in the direction along the surface of the substrate 1.

Since the image reading device 10 is constructed in this manner, the distance between the solid-state image pickup device 11 and the base plate 2 (in the optical axis direction) can be adjusted by adjusting the screwing positions of the left and right board receiving shaft position adjusting nuts 25. Position) and the tilt angle of its normal to the optical axis can be adjusted. In addition, before the fastening screw 3 is completely fastened, the adjustment rod 5 is inserted into the position adjustment hole 12 of the substrate 1 and moved and adjusted in the direction perpendicular to the optical axis, so that the solid state with respect to the base plate 2 is fixed. It is possible to adjust the position of the image pickup device 11 in a direction perpendicular to the optical axis and adjust the rotational position around the optical axis.

FIG. 2 is an external perspective view of the automatic position adjusting device 100 according to the present invention with the image reading device 10 of FIG. 1 attached. The automatic position adjusting device 100 roughly divides the position reference pin 4 into the position reference hole 21 of the base plate 2 to hold the image reading device 10 at the reference position, and the image forming lens 7 reads the adjustment chart 8 from the image. The adjustment jig 5 is inserted into the projection jig 81 for projecting onto the solid-state image pickup device 11 of the apparatus 10 and the position adjusting hole 12 of the solid-state image pickup device substrate 1, and the adjustment rod 5 is moved and adjusted in the direction perpendicular to the optical axis.
A position adjusting jig 82 for adjusting the screwing position of the board receiving shaft position adjusting nut 25, and temporary tightening and loosening of the fastening screw 3.
It comprises a fastening jig 83 for controlling the final fastening and a control device whose block diagram is shown in FIG.

In the projection jig 81, the position reference pins 4 corresponding to the two position reference holes 21 of the base plate 2 of the image reading device 10 are projected from the front surface, and the pin 4 should be inserted into the reference hole 21. Thus, the image reading device 10 that is precisely adjusted in position is attached to the reference position. Then, the solid-state image pickup device 11 of the image reading apparatus 10 attached at the reference position is illuminated with an adjustment chart 8 having a pattern (not shown) serving as a reference for alignment, focus, and magnification measurement, and the pattern is formed by the imaging lens 7. An image is formed on the image pickup surface of the solid-state image pickup device 11.

The position adjusting jig 82 moves the adjusting rod 5 in the optical axis direction (X axis) of the image reading apparatus 10.
6, a Y table 51 for moving the adjusting rod 5 in the horizontal direction (Y axis) perpendicular to the optical axis, a Z table 52 for moving the adjusting rod 5 in the vertical direction (Z axis) perpendicular to the optical axis, and two G table 53 that tilts the adjusting rod 5 around the optical axis (G axis) is superposed, and also via an arm or the like not shown,
An L-axis rotation adjuster 54 for adjusting the screwing position of the board receiving shaft position adjusting nut 25 on the left side (L axis), and the right side (R axis)
Precision table 84 equipped with an R-axis rotation adjuster 55 for adjusting the screw-in position of the nut 25 for adjusting the board receiving shaft position of
The adjusting rod 5 is attached to the G table 53 via the adjusting rod pressing spring 57. .

The fastening jig 83 is capable of engaging with the fastening screw 3 and tightening or loosening it with a predetermined torque. As will be described later, the torque driver 6 for temporarily fastening, loosening and permanently fastening the fastening screw 3 is used. A torque driver moving table 61 is provided for moving the torque driver 6 along the axis (D axis) parallel to the optical axis to the engaging position of the fastening screw 3 and the origin position retracted from the engaging position.

Further, in the control device of FIG. 3, a microcomputer 88, a memory 89 connected thereto, which stores a predetermined control program and data, and a solid-state image pickup device 11 of the image reading device 10 for position adjustment are adjusted. A signal processing device 87 that receives a waveform signal obtained by imaging the chart 8 and processes the signal, a precision table controller 85 that drives and controls each table of the precision table 84 of the position adjustment jig 82, and a rotation adjuster, and , Fastening jig 83
The torque driver controller 86 controls the fastening of the left and right torque drivers 6, and controls the operation of the automatic position adjusting device of this embodiment as described later.

Before explaining the present invention, in order to facilitate understanding of the present invention, a procedure when a conventional position adjusting method is adopted in such a configuration is shown in FIGS. 1 to 3 and a control flow. This will be described with reference to the flowchart of FIG. First, as shown in FIGS. 1 to 3, the position reference pin 4 provided on the projection jig 81 is inserted into the position reference hole 21 of the base plate 2, and the image reading device 10 is mounted on the projection jig 81 by a method not shown. Attach and fix to. Then, in response to a command from the microcomputer 88, the X table 56 and the torque driver moving table 61 are moved to the adjusting position via the precision table controller 85 to insert the adjusting rod 5 into the position adjusting hole 12, and the torque driver 6 is set. Fastening screw 3
(The bit of the torque driver 6 and the screw head of the fastening screw 3 are aligned.) (Step ST in FIG. 6)
1).

Next, the fastening screw 3 is lightly tightened by the torque driver 6 to temporarily tighten the solid-state image pickup device substrate 1 to the substrate receiving shaft 24 (step ST2 in FIG. 6), and the position adjusting loop is entered.

In the position adjustment loop, first, the adjustment chart 8 having a picture (not shown) serving as a reference for alignment, focus and magnification measurement is illuminated, and the picture is imaged on the solid-state image sensor 11 by the imaging lens 7. The waveform signal of the solid-state imaging device 11 is input to the signal processing device 87, and the measured values of alignment, focus, and magnification are calculated by the computer 88 (step ST3 in FIG. 6), and then these are calculated in step ST4 in FIG. Based on the measurement result, it is determined whether the measured value is within the target value. When it is not within the target value, the adjustment amounts for the Y axis, Z axis, G axis, L axis, and R axis are calculated (step ST5 in FIG. 6). When it is within the target value, the tightening screw 3 is strongly tightened to perform the final tightening (step ST9 in FIG. 6), and then the X-table 56 and the torque driver moving table are set in order to retract the adjusting rod 5 and the torque driver 6. 61 is moved to the origin position (step ST10 in FIG. 6).

In positioning the solid-state image pickup device substrate 1 based on the movement command for each adjustment axis, first, adjustment is performed for the L axis and the R axis. L-axis rotation adjuster 54, R-axis rotation adjuster 55
By adjusting the rotation amount of the board receiving shaft position adjusting nut 25 by the calculated value, the position of the solid-state imaging device 11 mounted on the solid-state imaging device substrate 1 in the optical axis direction and the inclination angle of the normal line to the optical axis are adjusted. It is adjusted (step ST6 in FIG. 6). Although the position of the solid-state image pickup device substrate 1 in the optical axis direction is changed by this adjustment, the X table 56 and the torque driver moving table 61 are kept so that the pressing force of the adjusting rod 5 and the torque driver 6 against the solid-state image pickup device substrate 1 is kept constant. After changing the position (adjustment position) of (step ST7 of FIG. 6), Y
The table 51, the Z table 52, and the G table 53 are moved by the calculated amounts to adjust the Y axis, the Z axis, and the G axis (step ST8 in FIG. 6).

When the alignment (Y axis, Z axis, G axis), focus (L axis, R axis) and magnification (L axis, R axis) are adjusted within the target value range (step ST4 in FIG. 6), the position After exiting the adjustment loop, the tightening screw 3 is strongly tightened to perform the final tightening (step ST9 in FIG. 6), and then the X table 56 and the torque driver moving table 61 are moved to retract the adjusting rod 5 and the torque driver 6. It is moved to the origin position (step ST10 in FIG. 6).

In the conventional position adjustment procedure described above,
Before entering the position adjustment loop, the solid-state imaging device substrate 1 is temporarily fastened to the substrate receiving shaft 24 (tightening with a small torque,
Make the position adjustable. ). This is because, as shown in the relationship between the screw tightening torque and the positional deviation amount in FIG. 4, the positional deviation when the fastening screw 3 is tightened almost occurs before the screw 3 is seated on the solid-state imaging device substrate 1, and Is a measure for reducing the positional deviation at the time of final tightening by utilizing the feature of being small. This method of adjustment in the temporarily tightened state is generally used, but in the case of a flexible and easily deformable target such as the solid-state imaging device substrate 1, bad side effects occur. That is, when the solid-state image sensor substrate 1 is temporarily fastened,
Since the adjustment is performed by moving in the directions of the axes Z, Z, and G, the solid-state image sensor substrate 1 is deformed due to the difference between the temporary fastening fixing force and the force of the adjusting rod 5 at the time of this position adjustment, and the position at the time of final fastening is adjusted. Although the displacement can be reduced, a large displacement occurs when the X table 56 and the torque driver moving table 61 are moved to the origin position, that is, when the adjusting rod 5 is pulled out from the position adjusting hole 12 of the solid-state image pickup device substrate 1. . In order to solve such a problem, conventionally, measures such as changing the support structure of the solid-state image sensor 11 or increasing the mechanical rigidity of the solid-state image sensor substrate 1 have been taken. The advantage of an image reading device with a small number is lost.

Therefore, in the present invention, the solid-state image pickup device substrate 1 and the like have a flexible structure.
It is intended to reduce the positional deviation of the image reading device 10 when the position adjustment is completed and the screw is fully tightened and the adjusting rod 5 and the torque driver 6 are retracted without being affected by the deformation of the component parts. Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3 and the flowchart of FIG. 5 showing a control flow.

First, the steps of moving the X table 56 and the torque driver moving table 61 to the adjusting position and temporarily fastening the solid-state image pickup device substrate 1 to the substrate receiving shaft 24 are shown in FIG. The method is the same. That is,
As shown in FIGS. 1 to 3, the position reference pin 4 provided in the projection jig 81 in the position reference hole 21 of the base plate 2
Is inserted, and the image reading device 10 is attached and fixed to the projection jig 81 by a method not shown. Then, the precision table controller 85 is instructed by the microcomputer 88.
The X-table 56 and the torque driver moving table 61 are moved to the adjusting position via the to insert the adjusting rod 5 into the position adjusting hole 12, and the torque driver 6 is engaged with the fastening screw 3 (of the torque driver 6). Bit and fastening screw 3
Align the screw heads of. ) (Step ST1 in FIG. 5). Next, the fastening screw 3 is lightly tightened by the torque driver 6 to temporarily tighten the solid-state imaging device substrate 1 to the substrate receiving shaft 24 (step ST2 in FIG. 5), and the position adjustment loop is entered.

Next, in step ST3 of FIG. 5, X
The table 56 is moved to the standby position and the adjusting rod 5 is pulled out from the position adjusting hole 12. This standby position is set at a position where the adjusting rod 5 is completely removed from the solid-state image sensor substrate 1.

Next, a position adjusting loop is entered, and the adjustment chart 8 having a picture (not shown) serving as a reference for alignment, focus and magnification measurement is illuminated, and the picture is imaged on the solid-state image sensor 11 by the imaging lens 7. . The waveform signal of the solid-state imaging device 11 is input to the signal processing device 87, and the computer 88 calculates alignment, focus, and magnification measurement values (step ST4 in FIG. 5), and then FIG.
In step ST5, it is determined based on these measurement results whether the measured value is within the target value. When it is not within the target value, the adjustment amounts for the Y axis, Z axis, G axis, L axis, and R axis are calculated (step ST6 in FIG. 5). When it is within the target value, the fastening screw 3 is strongly tightened to perform the final tightening (see FIG. 5).
Step ST13), and then the X table 56 and the torque driver moving table 61 are moved to the origin position in order to retract the adjusting rod 5 and the torque driver 6 (Step ST14 in FIG. 5).

The above is almost the same as the conventional method shown in FIG. 6, and the subsequent positioning method of the solid-state image pickup device substrate 1 is different from the conventional method. That is, in the positioning of the solid-state imaging device substrate 1 based on the movement command of each adjustment axis after the adjustment amount is calculated, first, the adjustment is performed with respect to the L axis and the R axis. L
The rotation amount of the board receiving shaft position adjusting nut 25 is adjusted by the shaft rotation adjuster 54 and the R axis rotation adjuster 55 by the calculated value,
Solid-state imaging device 11 mounted on solid-state imaging device substrate 1
The position in the optical axis direction and the tilt angle of the normal line with respect to the optical axis are adjusted (step ST7 in FIG. 5). Next, the X table 56 and the torque driver moving table 61 are moved to the adjusting position, the adjusting rod 5 is inserted into the position adjusting hole 12 (step ST8 in FIG. 5), and then the torque driver 6 is turned in the opposite direction and fastened. After loosening the screw 3 (step ST in FIG. 5
9), Y table 51, Z table 52, G table 5
3 is moved by the calculated amount to adjust the Y-axis, Z-axis, and G-axis (step ST10 in FIG. 5).

Thereafter, the fastening screw 3 is temporarily tightened again by the torque driver 6 (step ST11 in FIG. 5), and then the X table 56 is moved to the standby position to adjust the adjustment rod 5
Is removed from the position adjusting hole 12 (step ST1 in FIG. 5).
2).

When the alignment (Y-axis, Z-axis, G-axis), focus (L-axis, R-axis) and magnification (L-axis, R-axis) are adjusted within the target value range (step ST5 in FIG. 5), position After exiting the adjustment loop, the tightening screw 3 is strongly tightened to perform the final tightening (step ST13 in FIG. 5), and then the X table 56 and the torque driver moving table 61 are moved to retract the adjusting rod 5 and the torque driver 6. It is moved to the origin position (step ST14 in FIG. 5).

As described above, in the present invention, the Y axis and Z
Since the fastening screw 3 is temporarily loosened before the adjustment regarding the axis and the G axis is performed, the solid-state imaging device substrate 1 is not deformed in the alignment direction. Furthermore, adjusting rod 5
Is inserted into the position adjusting hole 12 only when adjusting the Y-axis, Z-axis, and G-axis, the alignment, focus, and magnification are not affected by the deformation of the solid-state imaging device substrate 1 in the optical axis direction. Can be measured and the target value can be determined. Further, since the solid-state image pickup device substrate 1 is temporarily tightened so that the position adjusting loop can be removed, the positional deviation of the fastening screw 3 at the time of final tightening is small (see FIG. 4). Therefore, according to the present invention, even when a flexible and lightweight solid-state image pickup device substrate is used, extremely high position adjustment accuracy can be obtained without being affected by deformation and distortion during positioning.

It should be noted that it is better to control the left and right screws at the same time while keeping the tightening screw 3 loosening angle and the temporary tightening angle constant.
The positioning accuracy of the solid-state image sensor substrate 1 can be increased. Further, the two adjusting rods 5 may be independently controlled, or the two torque drivers 6 may be independently controlled.

The automatic position adjusting device and the position adjusting method for the image reading apparatus of the present invention have been described above based on the embodiments, but the present invention is not limited to these embodiments and various modifications can be made. Further, the image reading device for the object to be adjusted is also disclosed in Japanese Utility Model Application Laid-Open No. 2-93866 and Japanese Patent Application Laid-Open No. 4-252656.
The present invention can be applied not only to the image sensor assembly according to the related art, but also to various known image reading devices.

[0036]

As described above, according to the automatic position adjusting device and the position adjusting method of the image reading device of the present invention, when the screw is tightened after the position adjustment is completed, the image reading device having a flexible structure is fastened. Also, the positional deviation when releasing the adjustment jig can be made extremely small, and high position adjustment accuracy can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an image reading apparatus which is an example of an object to be adjusted according to the present invention.

FIG. 2 is an external perspective view of an automatic position adjusting device according to an embodiment of the present invention.

FIG. 3 is a block diagram of a control device that constitutes the automatic position adjusting device in FIG.

FIG. 4 is a graph showing the relationship between screw tightening torque and displacement.

FIG. 5 is a flowchart showing a position adjustment procedure of the present invention.

FIG. 6 is a flowchart showing a conventional position adjustment procedure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Solid-state image sensor substrate, 2 ... Base plate, 3 ... Fastening screw, 4 ... Position reference pin, 5 ... Adjustment rod, 6 ... Torque driver, 7 ... Imaging lens, 8 ... Adjustment chart, 10 ...
Image reading device, 11 ... Solid-state image sensor, 12 ... Position adjusting hole, 13 ... Fastening screw through hole, 14 ... Signal cable, 2
1 ... Position reference hole, 22 ... Board receiving shaft sliding hole, 23 ... Board receiving shaft position adjusting spring, 24 ... Board receiving shaft, 25 ... Board receiving shaft position adjusting nut, 51 ... Y table, 52 ... Z table , 53 ... G table, 54 ... L-axis rotation adjuster, 5
5 ... R-axis rotation adjuster, 56 ... X table, 57 ... Adjustment rod pressing spring, 61 ... Torque driver moving table, 81 ... Projection jig, 82 ... Position adjusting jig, 83 ... Fastening jig, 84 ... Precision table , 85 ... Precision table controller, 86 ... Torque driver controller, 87 ...
Signal processing device, 88 ... Microcomputer, 89 ... Memory, 100 ... Automatic position adjusting device

Claims (3)

[Claims] 1. An at least one adjusting rod for adjusting a position of an image pickup device substrate in a direction orthogonal to an optical axis or an inclination around the optical axis, and the adjusting rod is moved in a direction orthogonal to the optical axis. 1
The above moving means, the moving means for moving the adjusting rod in the optical axis direction, the one or more screw fastening means for fastening the image pickup device substrate with a screw, and the moving means for moving the screw fastening means in the optical axis direction. In the automatic position adjusting device of the image reading apparatus, which comprises a control means for controlling the movement of the moving means and the screw fastening means, the control means controls the position of the image pickup element substrate prior to the position adjustment by the movement of the adjusting rod. An automatic position adjusting device for an image reading device, comprising means for loosening screw fastening. 2. The image according to claim 1, wherein the control means further comprises means for engaging the adjusting rod with the image pickup element substrate only when the position is adjusted by moving the adjusting rod. Automatic position adjustment device for readers. 3. An image reading device, wherein one or more adjustment rods are moved in the optical axis direction of the image pickup device substrate to be engaged with the image pickup device substrate, and a screw for fastening the image pickup device substrate is loosened to move the adjustment rod to the optical axis. The position of the image pickup device substrate in the direction orthogonal to the optical axis or the inclination around the optical axis is adjusted by moving it in the direction orthogonal to the axis, then the screw is temporarily tightened, and the adjustment rod is further moved to the optical axis. A method for adjusting the position of an image reading apparatus, comprising moving the screw in a direction opposite to the above direction, and finally tightening the screw after the adjustment is completed.