JPH06332077A - Picture reader - Google Patents

Abstract

PURPOSE:To easily adjust the fixed position of a lens unit in the direction of an optical axis by easily fixing the lens unit constituted of an image forming lens and a cylindrical housing storing the image forming lens at a specified position. CONSTITUTION:A lens unit fixing means 13 possesses a lens unit placing plate 47 where a lens unit supporting cut and removed part 51 having a pair of left and right side end faces 52 supporting the outer peripheral surface of the housing 46 and a positioning end face 53 perpendicular to the pair of the side end faces 52 is formed; a housing positioning means that makes one end face of the housing 46 abutting on the positioning end face 53 by pressing the other end face thereof; a leaf spring tightening band fixing the housing 46 on the lens unit placing plate 47; and a plate fixing means adjusting the position of the lens unit placing plate 47 in a back-and-forth direction and fixing it on a baseplate 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus capable of easily fixing an image forming lens to a base plate of a copying machine main body with a predetermined accuracy by a simple position adjusting operation. According to the present invention, a lens unit having an imaging lens that converges image reading light incident from the front toward a rear imaging position and a housing that houses the imaging lens is fixed to the base plate with a predetermined accuracy. Used when

[0002]

2. Description of the Related Art Conventionally, copying machines, image scanners,
In a facsimile machine or the like, an image forming lens is used for forming an image of a document at a position where an image sensor or a photoconductor is arranged.

FIG. 22 is a schematic vertical sectional view of an image reading apparatus of a digital copying machine to which the present invention is applied. FIG. 23 is an explanatory view of the operation of the image reading apparatus shown in FIG. 22, and is a plan view showing the optical path of the reflected light from the surface to be read of the document. Next, the outline of the image reading apparatus will be described with reference to FIG. Transparent platen glass 02 on which document 01 is placed
The image reading device 03, which is arranged below the image reading device, has a movable illumination unit 04 that illuminates the surface to be read 01a of the document 01. The illumination unit 04 includes a lamp 04a for illuminating the document and a first mirror. 04b are integrated with each other. Further, the image reading device 03 has a moving mirror unit 05 that moves at a speed half the moving speed of the illumination unit 04. The moving mirror unit 05 is composed of a second mirror 05a and a third mirror 05b. Further, the image reading device 03 reflects the image reading light reflected from the reading surface 01a of the original document 01 illuminated by the lamp 04a and further reflected by the mirrors 04b, 05a, 05b to a predetermined image forming position. It has an image forming lens 06 for forming an image and an image sensor 07 arranged at an image forming position of the image reading light.

Then, the illumination unit 04 moves in parallel to the document 01 on the platen glass 02 in the left-right direction in FIG. 22, and the moving mirror unit 05 is half the moving speed of the illumination unit 04. While moving at a speed of 1/2 distance, the reflected light of the document 01 illuminated by the lamp 04a is reflected by the mirrors 04b, 05a, 0.
5b and the imaging lens 06, and is converged on a plurality of photoelectric conversion elements (not shown) of the image sensor 07. The image reading signal obtained by the photoelectric conversion element of the image sensor 07 of the image reading device 03 is recorded after being digitized by an image processing unit (not shown) or an image output device (xerographic device, etc.) not shown. Is converted into a write drive signal (laser drive signal or the like).

In FIG. 23, the platen glass 02
The image of the upper original 01 is 1 / N by the imaging lens 06.
It is reduced to (magnification) and an image is formed on the image sensor 07. The image sensor 07 is attached to the main body of the copying machine via a sensor plate or the like. In that case, unless the image sensor 07 is accurately attached at a predetermined attachment position, a particularly good resolution MTF (Modulation Transfer Fu
The image sensor 07 must be accurately mounted at a predetermined mounting position for reasons such as the inability to obtain the nction characteristic.

For that purpose, it is necessary to adjust the mounting position of the image sensor with high accuracy and mount the image sensor as accurately as possible to the predetermined mounting position. Therefore, as shown in FIG. 24, the conventional image sensor has a position in the front-rear direction (X1-X2 direction), the left-right direction (Y1-Y2 direction), and the up-down direction (Z1-Z2 direction), as well as around the front-rear axis and in the vertical direction. I was adjusting the posture around the axis.

[0007]

In the image reading apparatus as described above, the imaging lens 06 used is usually cylindrical, and the imaging lens is inserted as shown in Japanese Utility Model Laid-Open No. 3-46275. Have a casing to secure
It was fixed by another processed sheet metal and fixing screws. However, in these conventional techniques, since the lens is moved and adjusted with respect to the fixing member in the optical axis direction, there is a problem that there is a slight misalignment when the lens is fixed after the position adjustment, and a positional deviation due to vibration or impact during transportation occurs. There was a problem that it was easy to do.

In view of the above circumstances, the present invention has the following contents. (O01) To make it possible to easily fix a lens unit composed of an imaging lens and a cylindrical housing accommodating the imaging lens at a predetermined position. (O02) To make it possible to easily adjust the fixed position of the lens unit in the optical axis direction.

[0009]

The present invention devised to solve the above problems will now be described. The elements of the present invention are to facilitate correspondence with the elements of the embodiments described later. Note that the reference numerals of the elements of the embodiments are enclosed in parentheses. It is to be noted that the reference numerals in parentheses connected with a + sign indicate that a combination of a plurality of elements of the embodiments corresponds to the element of the present invention. Further, the reason why the present invention is described in association with the reference numerals of the embodiments described later is to facilitate understanding of the present invention and not to limit the scope of the present invention to the embodiments.

In order to solve the above problems, the first of the present application
The image reading device of the invention includes a base plate (12) having an upper surface extending in the front-rear direction and the left-right direction, an imaging lens for converging image reading light incident from the front toward a rear imaging position, and the imaging lens. A lens unit (14) having a housing (46) for housing the
An image reading device comprising: 4) a lens unit fixing means for fixing the position on the base plate (12) so that the position can be adjusted. (Y01)
The housing (46) of the lens unit (14) has a cylindrical outer peripheral surface, (Y02) The lens unit fixing means (13) includes a pair of left and right side end surfaces (52) that support the outer peripheral surface of the housing (46). ) And a lens unit mounting plate (47) having a lens unit supporting cutting portion (51) having a positioning end surface (53) perpendicular to the pair of side end surfaces (52), and the housing (4).
6) a housing positioning means for pressing one end surface and contacting the other end surface with the positioning end surface (53); and a leaf spring for fixing the housing (46) to the lens unit mounting plate (47). The tightening band and the lens unit mounting plate (47) are attached to the base plate (12).
And plate fixing means for adjusting the position in the front-rear direction and fixing the plate.

An image reading apparatus according to a second invention of the present application is the image reading apparatus according to the first invention, characterized by having the following requirements: (Y03) The plate fixing means is the lens unit. A fixing plate for mounting the mounting plate (47) such that the left and right positions thereof cannot be adjusted and the front and rear positions thereof can be adjusted, and the lens unit mounting plate (47)
Means for guiding the back and forth direction on the base plate (12),
Means for fixing the fixing plate on the base plate (12).

An image reading apparatus of a third invention of the present application is the image reading apparatus of the first or the second invention, characterized in that the following requirements are satisfied: (Y04) The housing positioning means is A positioning plate (61) that can be brought into contact with the end surface of the housing (46) that is raised from the fixing plate and supported by the lens unit supporting cutout portion (51).

(Supplementary explanation of means for solving the problem)
In each of the inventions of the present application, the “plate fixing means for adjusting the position of the lens unit mounting plate (47) on the base plate (12) by adjusting the position in the front-rear direction” is a fixing plate (49). It is possible to adopt a method of directly fixing the lens unit mounting plate (47) on the base plate (12) without using it. In that case, the "housing positioning means for pressing one end surface of the housing (46) and bringing the other end surface into contact with the positioning end surface (53)" is provided on the lens unit mounting plate (47). It can be constituted by a screw or an elastic member.
When the screw is used, the tip of the screw can be configured to press one end surface of the housing (46).

[0014]

Next, the operation of the present invention having the above features will be described. In the image reading apparatus of the first invention of the present application having the above-mentioned features, the housing (46) of the lens unit (14) has a cylindrical outer peripheral surface. The lens unit supporting plate (47) includes a pair of left and right side end surfaces (52) for supporting the outer peripheral surface of the housing (46) and the pair of side end surfaces (52) in the lens unit supporting cutout portion (51). It has a vertical positioning end face (53). The housing (46) of the lens unit (14) is supported by the pair of left and right side end faces (52) of the lens unit supporting cutout portion (51), and the lens unit (14) is supported by the housing positioning means. The end face is pressed, and the other end face is the positioning end face (53).
To abut. In this state, the lens unit (1
The housing (46) of 4) is fixed to the lens unit mounting plate (47) by a tightening band made of a leaf spring. The lens unit fixing means (13) has plate fixing means, and the plate fixing means fixes the lens unit mounting plate (47) on the base plate (12) by adjusting the position in the front-rear direction. That is, the lens unit (14) includes a lens unit fixing means (1
By 3), the position is fixedly adjustable on the base plate (12) having the upper surface extending in the front-rear direction and the left-right direction.

As described above, the housing (46) of the lens unit (14) fixed at a predetermined position on the base plate (12) through the lens unit mounting plate (47).
The imaging lens housed inside converges the image reading light incident from the front toward the rear imaging position. An image sensor (23), a photoreceptor for forming a latent image, or the like is arranged at the image forming position.

The position of the image sensor (23) arranged at the image forming position or the photosensitive member for forming a latent image is changed by the error of the mounting position of each member when the constituent members are exchanged. The position where the image reading light converges on the image sensor (23) or the surface of the photoconductor may deviate from a predetermined position. When the converging position of the image reading light deviates back and forth from each photoelectric conversion element (23i) of the image sensor (23), the lens unit mounting plate (47) is fixed to the base plate (12) by the plate fixing means. ) Adjust the position in the front-back direction and fix it on top.

In the image reading apparatus of the second invention of the present application having the above-mentioned characteristics, the lens unit mounting plate (4
7) is mounted on the fixing plate (49) of the plate fixing means such that the left and right positions cannot be adjusted and the front and rear positions can be adjusted, and is guided in the front and rear direction on the base plate (12). Then, the fixing plate (49) is fixed at a predetermined position on the base plate (12). Therefore, the lens unit mounting plate (47) is fixed by the fixing plate (49) at a predetermined position in the left-right direction on the base plate (12) by adjusting the position in the front-rear direction.
Therefore, the lens unit mounting plate (47)
The lens unit (14) fixed on the base plate (1)
2) The position in the front-rear direction is adjusted and fixed to a predetermined position in the left-right direction above.

In the image reading apparatus of the third invention of the present application having the above-mentioned characteristics, the lens unit mounting plate (4
The positioning plate (6) raised from the fixing plate (49) is provided on the end face of the housing (46) supported by the lens unit supporting cutting portion (51) of (7).
1) abut. Excision part for lens unit support (51)
The housing (46) is positioned by sandwiching the front and rear end surfaces of the lens unit (14) by the positioning end surface (53) and the positioning plate (61).

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the image reading apparatus of the present invention will be described below with reference to the drawings, but the present invention is not limited to the embodiments. In the description of the drawings in this specification, "forward" means the direction of arrow X1 in the drawing,
"Backward" means the direction of arrow X2 (see FIG. 1) in the figure. Further, "left" means the arrow Y1 direction in the drawings (see FIGS. 1 and 2), and "right" means the arrow Y2 direction in the drawings. Furthermore, "upper" means the Z1 direction in the figure, and "lower" means the Z2 direction in the figure. Furthermore, in the figure, "." In "○" means an arrow pointing from the back side of the paper to the front side.
What has "X" written inside means an arrow from the front to the back of the paper. A plane perpendicular to the Z axis is defined as an XY plane, where the X1 direction is the X axis, the Y1 direction is the Y axis, and the Z1 direction is the Z axis.

(Embodiment 1) First, an outline of an embodiment of the image reading apparatus will be described with reference to FIG. 1, and then the embodiment will be described in detail with reference to FIG. FIG. 1 is a vertical sectional view of an image reading apparatus of a digital copying machine to which the present invention is applied. In FIG. 1, the copying machine includes an image input terminal IIT (hereinafter also simply referred to as “ITT”) arranged at an upper part thereof and an image output terminal IOT (hereinafter simply referred to as “ITT”) arranged below the image input terminal IIT. I
OT ”). IIT is a part provided with a document image reading element such as an exposure optical system and an image sensor, and IOT is a part for outputting a document image read by the IIT.

The IIT is provided with a frame (hereinafter referred to as "IIT frame") F that supports the document image reading element. At the upper end of the IIT frame F, a platen glass 2 on which the document 1 is placed is provided. The IIT
The frame F is composed of a pair of guide rails (not shown) extending in the front-rear direction (X1-X2 direction) arranged at both ends in the left-right direction (direction perpendicular to the paper surface, that is, Y1-Y2 direction). An illumination unit guide rail (not shown) and a mirror unit guide rail (not shown) are respectively supported. The illumination unit 3 guided by the illumination unit guide rail (not shown) has a light source 4 and a first mirror 6, and scans the surface to be read of the original 1 along the lower surface of the platen glass 2. While moving back and forth (X1-X2 direction). The mirror unit 7 guided by the mirror unit guide rail (not shown) has a second mirror 8 and a third mirror 9, and the mirror unit 7 is moved in the front-rear direction at a speed (1/2) of the speed of the lighting unit 3. Moves back and forth in the (X1-X2 direction).

The IIT frame F has a left-right direction (Y1
A base plate fixing member 11 is provided at each end of the base plate fixing member 11, and a base plate 12 is fixed to the base plate fixing member 11 so that the position in the front-back direction can be adjusted. The base plate 12
On the upper surface, the lens unit fixing means 1 is provided at an intermediate portion in the front-rear direction.
The lens unit 14 is fixed by 3 so that its position can be adjusted. A light shielding plate 15 is supported on the upper surface of the base plate 12, and the light shielding plate 15 is arranged close to the rear end surface of the lens unit 14. An assembly mounting plate supporting device 16 is supported on the upper surface of the base plate 12 at its rear end. The assembly mounting plate supporting device 16 has a rotating plate 17 and a vertical position adjusting means 18 whose positions can be adjusted around a vertical rotation fulcrum.
The vertical position adjusting means 18 is a means for supporting the rotating plate 17 so as to adjust the vertical position of the assembly mounting plate 19 and the left and right inclination postures thereof, and the position adjusting screw 18a and the compression spring described in detail later. 18b. A sensor assembly 21 is mounted on the assembly mounting plate 19. Sensor assembly 21
Is a substrate supporting plate 22 mounted on the assembly mounting plate supporting device 16, a sensor substrate 24 on which an image sensor 23 having a large number of photoelectric conversion elements arranged in the left-right direction is mounted, and the substrate supporting plate. It has a plate / plate connecting means 25 for connecting the plate 22 and the sensor substrate 24 in a positionally adjustable manner.

The assembly mounting plate supporting device 16
Is for focusing the original image reading light reflected from the original 1 through the mirrors 6, 8 and 9 and further through the imaging lens of the lens unit 14 onto the photoelectric conversion element of the image sensor 23. In addition, it has a function of adjusting the position and orientation of the sensor substrate 24. The image sensor 23 converts the formed image into an electric signal and reads it. The read image signal is supplied via a signal line 27 connected to the sensor substrate 24 to a device for forming an electrostatic image under the copying machine, that is, an IOT (image output terminal). Also, the base plate 12
A light-shielding cover 28 is fixed on the upper side, and a light-passing window 28a is formed on the front surface (surface on the X1 side) of the light-shielding cover 28. The light-shielding cover 28 is made of a conductive material having a shielding function, and is arranged so as to cover the periphery of the sensor substrate 24. The light shielding cover 28 is grounded by a ground wire 29.

Next, referring to FIGS. 2 to 13, the first embodiment is described.
Will be described in detail. 2 is an exploded perspective view of a main part of this embodiment, FIG. 3 is a plan view of the first embodiment, and FIG. 4 is a lens unit fixing means 13 and a lens unit 1 shown in FIGS.
4 is an enlarged view of FIG. 4, FIG. 5 is an exploded perspective view of the lens unit fixing means 13 and the lens unit 14 shown in FIG. 4, and FIG. 6 is an explanatory view of the lens unit mounting plate of the lens unit fixing means 13 shown in FIG. FIG. 7 is a plan view of a fixing plate of the lens unit fixing means 13 shown in FIG.
FIG. 8 is an explanatory view of an assembly mounting plate supported by the assembly mounting plate supporting device of the first embodiment and a sensor assembly mounted on the assembly mounting plate, and FIG. 8A is a rear view.
B is a side view, FIG. 9 is a sectional view taken along the line IX-IX of FIG. 8A, FIG. 10 is a sectional view taken along the line XX of FIG. 8A, FIG. 11 is an explanatory view of a rocking preventive device, and FIG. A8 XIA-XIA
FIG. 11B is an enlarged view of the main part of FIG. 11A, and FIG.
1C is a view showing a state different from FIG. 11B, FIG. 12 is an explanatory view of the rotary plate 17 of the assembly mounting plate supporting device 16 of the first embodiment, and FIG. 12A is a top view.
B is a rear view, FIG. 13 is an explanatory view of a rotational position adjusting cam C used for adjusting the rotational position of the rotary plate 17,
13A is a perspective view of the rotational position adjusting cam C, FIG. 13B is a plan view for explaining the operation thereof, and FIG.
14 is a cross-sectional view taken along line XIIIC-XIIIC of FIG. 14, FIG. 14 is an explanatory view of the assembly mounting plate 19 of the first embodiment, FIG. 14A is a top view, FIG. 14B is a rear view, and FIG. 16 are explanatory views of the substrate support plate 22 of the sensor assembly 21, FIG. 16A is a top view, and FIG. 16B is a rear view.

In FIGS. 2 and 3, the base plate 12 has mounting screw through holes 31 formed in the front and rear at both left and right ends (both ends in the Y1-Y2 direction) of the base plate 12. The mounting screw through hole 31 is a hole through which a mounting screw (not shown) for fixing the base plate 12 to the base plate fixing member 11 (see FIG. 1) penetrates. The mounting screw through hole 31 is formed in a long hole so that the position in the front-back direction with respect to the base plate fixing member 11 can be adjusted. Further, the base plate 12 is provided with two cover mounting screw holes 32 for fixing the light shielding cover 28. A pair of unit guide projections 33 for guiding the lens unit fixing means 13 in the front-back direction and a pair of unit fixing screw holes 3 for fixing the lens unit fixing means 13 at predetermined positions are formed on the base plate 12.
4 are provided. Further, when the lens unit fixing means 13 is placed on the base plate 12, constituent elements (tightening bands 48 described later) protruding below the lens unit fixing means 13 are provided on the base plate 12. A pair of escape holes 36 are formed so as not to interfere with each other.

In FIG. 2, the base plate 12 is provided with a pair of light-shield plate guide protrusions 37 for guiding the light-shield plate 15 in the front-rear direction and a pair of light-shield plate fixing screw holes 38 for fixing the light-shield plate 15 at a predetermined position. It is provided. The pair of light-shielding plate guide projections 37 are formed by half blanking (a step of stopping the punching step in the middle). Further, the center portions of the front end edge and the rear end edge of the base plate 12 in the left-right direction are bent downward to increase the rigidity. Further, a small stud support portion 3 protruding rearward is provided at a substantially central portion of the rear end of the base plate 12.
9 is provided. A rotation stud 41 as a rotation fulcrum projects upward from the stud support portion 39. A rectangular rocking prevention hole 42 is formed slightly forward of the stud support portion 39.

A pair of left and right rotary plate fixing screw holes 43 are formed at intervals on the left and right sides of the rocking prevention hole 42. A circular cam shaft insertion hole 44 is formed at a position slightly rearward and rightward of the right rotary plate fixing screw hole 43.

Next, the lens unit fixing means 13 and the lens unit 14 will be described with reference to FIGS. 4 to 7, a lens unit 14 is a cylindrical housing 4 having a lens system (not shown) built therein.
Have six. The lens unit fixing means 13 includes a lens unit mounting plate 47 on which the lens unit 14 is mounted, a tightening band 48 for fixing the lens unit 14 to the lens unit mounting plate 47, and the lens unit mounting plate. It has a fixing plate 49 that supports 47 and is fixed to the base plate 12. The tightening band 48 is formed of a thin metal plate having elasticity, and notches 48a for locking are formed at both ends thereof.

In FIG. 5, the lens unit mounting plate 47 has a central portion bulging upward, and a lens unit supporting cutting portion 51 is formed in the central portion of the bulging portion. The pair of left and right side end surfaces 52 of the cut-out portion 51 for supporting the lens unit is the housing 4 of the lens unit 14.
6 has a function of supporting the cylindrical outer peripheral surface, and a rear end surface 53 perpendicular to the pair of left and right side end surfaces 52 has a lens unit 14
It is formed as a positioning end surface 53 that comes into contact with the rear end surface. Band locking holes 54 are formed on the left and right sides of the lens unit supporting cutout 51, respectively. The pair of left and right band locking holes 54 are provided with narrow locking portions 54a for locking the locking notches 48a of the tightening band 48. As shown in FIG. 4, the lens unit 14 is placed on the lens unit supporting cutout portion 51, and the tightening band 48 is wound from the outside of the lens unit 14 and the tip thereof is inserted into the band locking hole 54. To do. Next, when the locking notch 48a is locked to the narrow locking portion 54a of the band locking hole 54, the lens unit 14 is fixed to the lens unit mounting plate 47.

On the lens unit mounting plate 47, rectangular guided holes 56 extending forward and backward are formed at the front and rear positions of the band locking hole 54 on the left side. The pair of front and rear guided holes 56 correspond to the base plate 12 shown in FIG.
It is a hole that is guided back and forth by the pair of unit guide protrusions 33. Lens unit mounting plate 47
On the left side of the pair of guided holes 56, fixed plate guided holes 57 are formed. The fixed plate guided hole 57 is a hole that is guided by a guide protrusion (described later) on the fixing plate 49 when the lens unit mounting plate 47 is positioned and fixed to the fixing plate 49. Fixing screw through holes 58 are formed in the lens unit mounting plate 47 outside the pair of band locking holes 54, respectively. The fixing screw through hole 58 is provided with a screw 59 (see FIG. 3) for fixing the lens unit mounting plate 47 to the fixing plate 49.
(See) is a through hole.

In FIG. 5, the fixing plate 49 is provided.
Is a member fixed to the base plate 12 with the lens unit mounting plate 47 supported on the upper surface thereof.
A rising wall 61 as a positioning means is formed on the fixing plate 49. This rising wall 6
As shown in FIG. 4, the reference numeral 1 penetrates the lens unit supporting cutout portion 51 and extends upward. The rising wall 61 presses the front end surface of the housing 46 of the lens unit 14 supported by the lens unit supporting cutout portion 51, and the rear end surface of the housing 46 is moved to the positioning end surface 53.
It has the function of abutting against.

On the fixing plate 49, band tip escape holes 62 are formed on the left and right of the rising wall 61, respectively. The band end escape hole 62 is formed by the tightening band 4 described above.
It is a hole for preventing the tip of 8 from interfering with the fixing plate 49. In the fixing plate 49, elongated holes 63 extending in the front-rear direction are formed in front of and behind the left band tip escape hole 62, respectively. The pair of front and rear long holes 63 are formed at positions overlapping the guided holes 56 when the lens unit mounting plate 47 is fixed on the fixing plate 49, and are slightly wider than the guided holes 56. Is formed in. That is, the elongated hole 63 is a hole through which the pair of unit guide projections 33 on the base plate 12 pass, and the guided hole 56 is a hole that is guided back and forth by the unit guide projections 33.

The fixing plate 49 is provided with guide protrusions 64 on the left side of the pair of elongated holes 63. The pair of front and rear guide protrusions 64 is formed by half blanking (step of stopping the punching step). The guide protrusion 64 engages with the fixed plate guided hole 57 of the lens unit mounting plate 47 mounted on the fixing plate 49, so that the lens unit mounting plate 47 is fixed on the fixing plate 49. It is a protrusion for guiding back and forth. In the fixing plate 49, fixing screw holes 66 are formed outside the pair of left and right band escape holes 62, respectively. The fixing screw hole 66 is a hole into which a screw 59 (see FIG. 3) for fixing the lens unit mounting plate 47 to the fixing plate 49 is screwed.

On the fixing plate 49, rectangular fixing screw through holes 67 extending forward and backward are formed outside the pair of left and right fixing screw holes 66. The pair of left and right fixing screw through holes 67 are formed by the guided holes 56 that engage with the unit guide projections 33 on the base plate 12.
A lens unit mounting plate 47 that is guided back and forth on the base plate 12 and a fixing plate 49 that supports the lens unit mounting plate 47.
Is a hole that is used to lock in place. A screw 68 penetrating the fixing screw through hole 67 (see FIG. 3)
Are screwed into the unit fixing screw holes 34 (see FIG. 2) of the base plate 12.

The lens unit fixing means 3 is composed of the elements indicated by the reference numerals 47 to 68. Further, a fixing plate 49 for mounting the lens unit mounting plate 47 such that the left and right position adjustment is not possible and the front and rear position adjustment is possible,
Means 33 and 56 for guiding the lens unit mounting plate 47 in the front-back direction on the base plate 12, and means 34 (see FIG. 2) and 68 (refer to FIG. 3) for fixing the fixing plate 49 on the base plate 12. (Refer to FIG. 3), a plate fixing means for fixing the lens unit mounting plate 47 on the base plate 12 by adjusting the position in the front-rear direction is configured.

The light shield plate 15 shown in FIGS. 1, 2 and 3 includes a vertical wall 71 having a cutout portion 71a for passing light, and the vertical wall 7 described above.
It has a left side horizontal mounting portion 72 and a right side horizontal mounting portion 73 that horizontally extend rearward from the lower ends of the left and right end portions of 1. Screw through-holes 72a and 73a for fixing the light shielding plate 15 to the base plate 12 are formed in the front-rear center portions of the left side horizontal mounting portion 72 and the right side horizontal mounting portion 73, respectively. Each of the screw through holes 72a and 73a is a long hole extending in the front-rear direction. On both front and rear sides of the screw through hole 73a of the right horizontal mounting portion 73,
The guided long holes 73b, 73b are formed. The guided long holes 73b, 73b are holes for engaging with the pair of light shielding plate guide projections 37 on the base plate 12 and for guiding them back and forth. The light shielding plate 15 is guided in the front-rear direction by the pair of light shielding plate guide protrusions 37 on the base plate 12, and at a predetermined position, the screw through hole 73a.
And a screw hole 38 for fixing the light shielding plate (see FIG. 2)
It is adapted to be fixed to the base plate 12 by a screw (not shown) which is screwed into.

Next, the rotary plate 17 will be described mainly with reference to FIGS. 2, 3 and 12, the rotary plate 17 includes a vertical wall 74 and a left-side horizontal mounting portion 7 provided at the lower ends of the left and right ends of the vertical wall 74.
5 and the right horizontal mounting portion 76, and the lower horizontal wall 77 extending rearward (in the X2 direction) from the center portion in the left-right direction of the lower end of the vertical wall 74.
And an upper horizontal wall 78 extending forward (X1 direction) from the upper end of the vertical wall 74. The vertical wall 74 has a cutout portion 7 extending in the left-right direction (Y1-Y2 direction) in the central portion.
4a is formed. The central portion of the cutout portion 74a is a cutout portion for passing light, and both end portions are cutout portions for avoiding interference with a nut 83 (see FIG. 2, details will be described later) of the sensor assembly 21 described later. In addition, circular cutouts 74b are provided at both left and right ends of the vertical wall 74 to prevent interference with an assembly mounting screw 82 (see FIG. 2, details will be described later) for mounting the sensor assembly 21 on the assembly mounting plate 19. It is provided. Above the circular cutout 74b, a spring penetration cutout 74c is formed in the vertical wall 74 and the upper horizontal wall 78. The C-shaped spring 81 (see FIGS. 2 and 15; details will be described later) for pressing the front surface of the assembly mounting plate 19 to the rear surface (surface on the X2 side) of the spring penetrating cutting portion 77c rotating plate 17 is penetrated. It is a hole.

Further, the cutout portion 74a is formed on the vertical wall 74.
A horizontal fulcrum stud 79 extending rearward is provided at a position below the leftward portion of the. This fulcrum stud 79
Is the sensor assembly 2 with respect to the rotating plate 17.
It has a function as a plate left-right direction positioning means that supports the first substrate support plate 22 so that it cannot move left and right and can rotate and move up and down.

The vertical wall 74 of the rotary plate 17 is also used.
The left-side horizontal mounting portion 75 and the right-side horizontal mounting portion 76, which are respectively provided at the lower ends of the left and right ends of the, are portions supported on the base plate 12, and the rotary plate 17 is mounted on the base plate 12.
And screw through holes 75a and 76a for fixing the same to each other. Further, a cam fitting cutout portion 76b is formed on the right horizontal mounting portion 76.

Further, the lower horizontal wall 77 is shown in FIGS.
As can be seen from B, 10, and 11, they are provided slightly above the left and right horizontal mounting portions 75 and 76, and float from the upper surface of the base plate 12. A stud fitting hole 77a that fits into the rotation stud 41 on the base plate 12 is formed in a portion of the lower horizontal wall 77 on the left side of the central portion. Therefore, the rotary plate 17 is rotatable on the base plate 12 around the rotary stud 41 (that is, around the vertical axis).

The rotation position of the rotation plate 17 around the rotation stud 41 is determined by using the rotation position adjusting cam C shown in FIG. In FIG. 13A, the rotational position adjusting cam C is composed of a disk-shaped cam portion C1, an eccentric cam shaft C2 provided on the lower surface of the cam portion C1, and a plate-shaped knob C3 provided on the upper surface. There is. In FIGS. 13B and 13C, with the eccentric cam shaft C2 of the rotational position adjusting cam C fitted in the cam shaft insertion hole 44 on the base plate 12, the outer peripheral surface (cam surface) of the cam portion C1 is as described above. Right horizontal mounting part 76
Of the cam fitting cutout portion 76b. This Figure 1
In the state shown in FIG. 3B, when the knob C3 is turned, the right horizontal mounting portion 76 of the rotary plate 17 moves forward and backward (X1-X2 direction), so that the rotary plate 17 moves around the rotary stud 41 shown in FIG. Rotate. When the rotary plate 17 is in a predetermined rotation position, a screw (not shown) penetrating the screw through holes 75a and 76a is screwed into the rotary plate fixing screw hole 43 (see FIG. 2) of the base plate 12. The rotary plate 17 is fixed at a predetermined position on the base plate 12.

The lower horizontal wall 77 has the stud fitting hole 7
A rocking preventive hole 77b is formed at a position to the front of and to the left of 7a. As shown in FIG. 11, this rocking prevention hole 77b
Are arranged above the rocking prevention holes 42 of the base plate 12. Positioning screw holes 78a are provided at both left and right ends of the upper horizontal wall 78. The position adjusting screw hole 78a is a hole into which the position adjusting screw 18a is screwed. Resin is applied to either the outer side surface of the position adjusting screw 18a or the inner side surface of the position adjusting screw hole 78a so that when they are screwed together, no play occurs and rattling does not occur. ing.

The vertical position adjusting means 18 (see FIGS. 1, 9 and 1)
The assembly mounting plate 19, which is attached to the rotary plate 17 by means of a reference numeral 0), has a vertical wall 86 and an upper horizontal wall 87 extending forward (X1 direction) from the upper end of the vertical wall 86. The vertical wall 86 is provided with a cutout portion 86a for passing light in the central portion thereof, and a circular shape for avoiding interference with the nut 83 (see FIG. 2, details will be described later) of the sensor assembly 21 on both left and right sides thereof. The cutout portion 86b is provided. In addition, the vertical wall 86 includes the cutout portion 8
A cutout portion 86c is provided below the left end portion (end portion in the Y1 direction) of 6a. The cutout portion 86c is a groove extending vertically that is slightly wider than the outer diameter of the horizontal fulcrum stud 79 of the rotary plate 17.

The long holes 86d through which the C-shaped spring 81 (see FIG. 15) penetrates and the tips of the C-shaped spring 81 are respectively locked at the upper portions of the left and right ends of the vertical wall 86 of the assembly mounting plate 19. Small engaging holes 86e are provided adjacent to each other. Further, vertical positioning protrusions 86f projecting rearward are provided at the lower portions of both left and right ends of the vertical wall 86, and an assembly mounting screw hole 86g that is screwed into the assembly mounting screw 82 is provided. Also, the upper horizontal wall 8 of the assembly mounting plate 19
The position adjusting screw through holes 87a through which the position adjusting screw 18a of the vertical position adjusting means 18 penetrates are provided at both left and right ends of the 7, respectively. The position adjusting screw through hole 87a is formed as an elongated hole extending in the left-right direction. The position adjusting screw through hole 87a is formed by extending leftward and rightward so that the assembly mounting plate 19 is positioned in the leftward and rightward direction so that the cutting portion 8 that engages with the fulcrum stud 79 is formed.
It is done by 6c. The inside diameter D1 (see FIG. 11B) of the position adjusting screw through hole 87a in the front-rear direction is larger than the outside diameter d1 of the position adjusting screw 18a of the vertical position adjusting means 18 (see FIGS. 1 and 2). There is.

Position adjusting screw 18 of the vertical position adjusting means 18
a penetrates the position adjusting elongated hole 87a (see FIG. 9),
It penetrates through the coil-shaped compression spring 18b and is screwed into the position adjusting screw hole 78a (see FIG. 9). The tip of the position adjusting screw 18a extends below the position adjusting screw hole 78a, that is, below the upper horizontal wall 78 of the rotary plate 17. As can be seen from FIGS. 9 and 15, one end of the C-shaped spring 81 is engaged with the lower portion of the upper horizontal wall 78 of the position adjusting screw 18a, and the other end of the C-shaped spring 81 is The cut-out portion 74c for spring penetration of the vertical wall 74 and the long hole 86d of the vertical wall 86 are penetrated and the tip thereof is locked in the locking hole 86e. With this C-shaped spring 81,
Front of vertical wall 86 of assembly mounting plate 19 (X1
The side surface) is pressed against the rear surface of the vertical wall 74 of the rotating plate 17 and is held in a close contact state. The rotating plate 1
7, vertical position adjusting means 18, and rotating stud 41
The assembly mounting plate support device 16 is composed of the fulcrum stud 79 and the C-shaped spring 81.

The sensor assembly 21 mounted on the rear surface of the assembly mounting plate 19 (that is, the sensor assembly mounting surface) includes the assembly mounting plate 1
Substrate support plate 2 mounted at a predetermined position with respect to 9
2 and a sensor substrate 24 mounted at a predetermined position with respect to the substrate support plate 22. The substrate support plate 22 and the sensor substrate 24 of the sensor assembly 21 are assembled in advance with a predetermined accuracy using a jig for assembly, and when the substrate support plate 22 is mounted on the assembly mounting plate 19, The image sensor 23 supported by the sensor substrate 24 can be mounted on the assembly mounting plate 19 at a predetermined position. This will be described in detail below.

2 and 16, the sensor assembly 2
The first substrate support plate 22 has a vertical wall 91, and the upper end of the vertical wall 91 is bent backward for rigidity reinforcement. At the center of the vertical wall 91 of the substrate support plate 22, a cutout portion 91a for passing light is formed extending in the left-right direction. Cylindrical members 92 fitted in the stud fitting holes are fixed to the left and right outer sides of the cutout portion 91a, respectively. A pair of left and right rocking preventing projections 91b extending downward from the lower end of the vertical wall 91 are provided below the left end portion of the light passing cutout portion 91a. This rocking prevention protrusion 9
As shown in FIG. 11, 1b extends downward through the rocking prevention hole 77b. The reason for this will be described below.

That is, when the copying machine shown in FIG. 1 is subjected to rough handling and receives an impact, the rotary plate 17 is passed through the compression spring 18b of the vertical position adjusting means 18 (see FIG. 2). The assembly mounting plate 19, which is supported by, may swing together with the sensor assembly 21 mounted on the assembly mounting plate 19 in the direction indicated by the chain double-dashed line in FIG. If such swinging is large, the C-shaped spring 81 may be damaged or the position adjusting elongated hole 87a may be deformed, so it is necessary to prevent the swinging. The rocking prevention protrusion 91b and the rocking prevention hole 77b are rocking preventing means (77b + 91b) for preventing the large rocking.

A left-right positioning cutting portion 91c extending vertically is formed between the pair of left and right rocking preventing projections 91b. The left-right locating cutout portion 91c is a groove for engaging with the horizontal fulcrum stud 79 of the rotary plate 17 to perform left-right locating. Further, the left-right direction positioning cutout portion 91c is a guided groove which is vertically guided by being engaged with the fulcrum stud 79 penetrating the cutout portion 86c of the assembly mounting plate 19. From the fulcrum stud 79 and the left-right positioning cutting portion 91c, the plate left-right positioning means (79+
91c) is configured.

As described above, since the substrate support plate 22 of the sensor assembly 21 is positioned in the left-right direction by the fulcrum stud 79 of the rotating plate 17, the assembly mounting plate 19 is correctly positioned in the left-right direction with respect to the rotating plate 17. Without the rotating plate 17
The horizontal positioning of the substrate support plate 22 with respect to can be performed correctly. Substrate support plate 22
With the cutout portion 91c for positioning in the left-right direction engaged with the fulcrum stud 79, it is possible to rotate around the fulcrum stud 79 to adjust the left and right inclined postures.

Long holes 91d are formed in the upper portions of the left and right ends of the vertical wall 91 of the substrate support plate 22, respectively. As can be seen from FIGS. 9 and 15, the pair of left and right elongated holes 91 d are holes for avoiding interference with the C-shaped spring 81. Below the pair of long holes 91d, vertical positioning long holes 91e extending in the left-right direction are formed. The vertical positioning elongated hole 91e is a hole that engages with the vertical positioning projection 86f (see FIGS. 2 and 14) of the assembly mounting plate 19. The vertical positioning protrusions 86f and the vertical positioning elongated holes 91e constitute vertical positioning means (86f + 91e). The board support plate 22 is positioned in the left-right direction by engaging the left-right positioning cutout 91c with the fulcrum stud 79, and the vertical positioning slot 91e is formed in the positioning projection 86f. By engaging, the vertical positioning is performed.

As shown in FIGS. 2 and 16B, the pair of vertical positioning long holes 91e are formed in the substrate support plate 22.
An assembly mounting screw through hole 91f is formed diagonally above. The inner diameter of the assembly mounting screw through hole 91e is formed larger than the outer diameter of the assembly mounting screw 82 (see FIGS. 2 and 9). Assembly mounting screw 8
No. 2 penetrates the assembly mounting screw through hole 91e and is screwed into the assembly mounting screw hole 86g.

An image sensor 23 is fixed to the front surface of a sensor substrate 24 connected to the substrate support plate 22 in a positionally adjustable manner, and a circuit for reading the amount of light detected by the image sensor 23 is provided on the rear surface. Has been formed.
Connecting screw through holes 24a are formed on the left and right of the image sensor 23 on the sensor substrate 24.

2, 10 and 11, the board / plate connecting means 25 for connecting the board supporting plate 22 and the sensor board 24 of the sensor assembly 21 has a pair of adjusting stud screws 93. A compression spring 94 is arranged on the outer periphery of the intermediate portion of the adjusting stud screw 93, and a tip screw portion 93a is formed at the tip thereof.
The tip screw portion 93 a of the adjusting stud screw 93 penetrates the tubular member 92 of the substrate support plate 22 and projects to the front of the substrate support plate 22. A nut 83 is screwed on the tip thread portion 93a of the adjusting stud screw 93. Further, a connecting screw hole 93c is formed in the head portion 93b of the adjusting stud screw 93. The board / plate connecting means 25 has a connecting screw 95 which is screwed into the connecting screw hole 93c. The connecting screw 95 penetrates the connecting screw through hole 24a of the sensor substrate 24 and is screwed into the connecting screw hole 93c.

The substrate / plate connecting means 25 is composed of the elements indicated by the reference numerals 83, 93 to 95. The sensor assembly 21 includes the substrate support plate 2
2, an image sensor 23, a sensor substrate 24, and a substrate / plate connecting means 25.

In FIG. 2, the light-shielding cover 28 fixed on the base plate 12 has a window 28a for light passage formed on the front surface. Further, horizontal fixing flanges are provided on the lower ends of the left and right ends of the light shielding cover 28, and fixing screw through holes 28b are formed in each fixing flange. The left fixing screw through hole 28b is a long hole extending leftward and rightward so that a manufacturing error in the interval between the left and right fixing screw through holes 28b can be compensated. A cover fixing screw (not shown) that penetrates each fixing screw through hole 28b of the light-shielding cover 28 is adapted to be screwed into a cover mounting screw hole 32 on the base plate 12.

As can be seen from FIGS. 1 and 2, the light-shielding cover 28 is fixed on the base plate 12, and the lens-unit fixing means 13, the lens unit 14, the light-shielding plate 15, and the assembly mounting plate support. Device (device in which an assembly mounting plate supporting device is configured from the rotating plate 17, the vertical position adjusting means 18, the rotating stud 41, the fulcrum stud 79, and the C-shaped spring 81), and assembly mounting It covers the plate 19, the sensor assembly 21, and the substrate / plate connecting means 25.

As can be seen from the above description, when the rotary plate 17 rotatable around the rotary stud 41 on the base plate 12 is fixed on the base plate 12, the fulcrum stud 79 on the rotary plate 17 is fixed. The position in the left-right direction is a fixed position with respect to the lens unit 14 fixed on the base plate 12. The assembly mounting plate 19 is supported on the rotary plate 17 by the vertical position adjusting means 18 such that the assembly mounting plate 19 can be adjusted in the horizontal tilting direction and the vertical position, and cannot be moved in the horizontal direction. As can be seen from FIGS. 2 and 3, the substrate support plate 22 of the sensor assembly 21 mounted on the assembly mounting plate 19 is
The vertical position is determined by the positioning protrusion 86f and the vertical positioning slot 91e engaged with the positioning projection 86f, and the horizontal position is determined by the fulcrum stud 79 and the horizontal positioning cutout portion 91c fitted thereto. It has become. Therefore, when the sensor assembly 21 is mounted on the assembly mounting plate 19, the horizontal position of the substrate support plate 22 of the sensor assembly 21 becomes a predetermined position with respect to the fulcrum stud 79.

The sensor assembly 21 comprises a substrate support plate 22, a sensor substrate 24 connected to the substrate support plate 22 at a predetermined position, and an image sensor 23 fixed to the sensor substrate 24. Has been done. Therefore, as described above, when the horizontal position of the substrate support plate 22 mounted on the assembly mounting plate 19 is determined with respect to the fulcrum stud 79, the horizontal position of the image sensor 23 also serves as a fulcrum. Determined for stud 79. Therefore, when the sensor assembly 21 is mounted on the assembly mounting plate 19 with the rotary plate 17 fixed on the base plate 12, the horizontal position of the image sensor 23 is on the base plate 12 unless there is a mounting error. The position is fixed with respect to the lens unit 14. That is, when the sensor assembly 21 is mounted on the assembly mounting plate 19, the horizontal position of the image sensor 23 with respect to the lens unit 14 is fixed within a mounting error range.

FIG. 17 is an explanatory view of the photoelectric conversion element 23i of the image sensor 23 of the sensor assembly 21,
FIG. 17A is an explanatory diagram of a state in which the reading range of the document and the position of the image sensor 23 in the left-right direction are arranged as set (state of manufacturing error 0), and FIG. 17B is the image sensor 2.
It is explanatory drawing of the state where the position of 3 was shifted to the right. The horizontal length L0 of the photoelectric conversion element 23i, on which the image reading light transmitted through the lens unit 14 converges, is the image reading element having a length L1 corresponding to the image reading width of the document having the largest reading size, and the left and right sides thereof. It is a length obtained by adding the margin elements of lengths L2 and L3 arranged on both sides. In FIG. 17A, when the sensor assembly 21 is mounted at a set position of the assembly mounting plate 19 with a mounting error of 0, the lengths of the left and right margin elements are set so that L2 and L3 are equal to each other. Has been done. In this case, the leftmost photoelectric conversion element of the large number of photoelectric conversion elements 23i is indicated by 23a, and the rightmost photoelectric conversion element is indicated by 23b. The photoelectric conversion element at the left end of the image reading element (the portion for reading the document having the maximum width) of the photoelectric conversion elements 23i is indicated by 23c.
The photoelectric conversion element at the right end is indicated by 23d.

In this embodiment, the maximum reading width of the original image is A3.
The length is set to 300 mm corresponding to the lateral width (297 mm), and it is determined that the range of 317.5 mm can be read in consideration of manufacturing error. Therefore, the number of effective pixels of the photoelectric conversion element 23i of the image sensor 23 is 5000
Pixels are formed within a range of length 35 mm (= L0). That is, the length L0 between the photoelectric conversion elements 23a and 23b at both ends of the photoelectric conversion element 23i is 35 mm. Then, the 317.5 mm wide original image is the
It is adapted to converge to 5000 pixels arranged within a width of 5 mm = L0. Further, the width at which the original image having the maximum reading width of 300 mm corresponding to the width of the A3 width is converged is 33.
And the length L1 between the photoelectric conversion elements 23c and 23d is 33.07 mm. In this case, (35-3
3.07) /2=0.964 (mm), that is, the margin pixel L
2 and L3 are set at 0.964 mm on each side. This margin pixel allows the image sensor 23 for the original image to
It is designed to absorb the positioning error in the left-right direction.

There is an error in the mounting position of the sensor assembly 21 to the assembly mounting plate, and the substrate support plate 22 of the sensor assembly 21 and the sensor substrate 2
4 or the mounting position between the sensor substrate 24 and the image sensor 23 has an error, the convergence position of the image reading light on the photoelectric conversion element 23i may be shifted to the left or right. . In this case, as shown in FIG. 17B,
The left margin element or the right margin element is used as an image reading element. In this case, the lengths L2 'and L3' of the margin elements 23i on the left and right sides of the image reading element having the length L1 are different. In the first embodiment, the length of the margin element is adjusted so that the image reading light does not deviate outward from the left and right end portions 23a and 23b of the photoelectric conversion element 23i even if a deviation in the left-right direction occurs due to each mounting error. L2 and L3 are set.

FIG. 18 is a diagram showing the positional relationship between the photoelectric conversion element 23i of the image sensor 23 and the fulcrum stud 79 in the horizontal direction and the vertical direction. Figure 18A shows X1
FIG. 18B is a diagram showing the positions of the substrate support plate 22 and the image sensor 23 with respect to the fulcrum stud 79 when viewed in the direction (front), and FIG. And FIG. 18C is a diagram showing a state when the image sensor 23 rotates by α from the state of FIG. 18B. When the mounting error is 0, as shown in FIG. 18B, the element 23c at one end (left end) of the image reading element is arranged at a position directly above the fulcrum stud 79. That is, the image at one end of the reading range of the document (that is, the image at the side registration position (reading reference position in the main scanning direction)) is located directly above the fulcrum stud 79 (that is, the image reading). Element 23
It is designed to be imaged in c). In addition, FIG.
The fulcrum stud 79 and the photoelectric conversion element 23i in the state of B
The distance between and is set to N. In addition, the first embodiment
Then, the value of N is set to 8.5 mm.

The substrate mounting plate 22 of the sensor assembly 21 is mounted on the assembly mounting plate 19, and then the assembly mounting plate 19 and the substrate supporting plate 22.
18C is adjusted by rotating the sensor assembly 21 (that is, the image sensor 23) from the state of FIG. 18B to the state of FIG. 18C. Then, as shown in FIGS. 18B and 18C, the image reading element 23c at the one end moves in the left-right direction by Nsinα. At this time, the image reading element 23c is ± N
Move in the vertical direction (Z1-Z2 direction) by (1-cosα) / cosα. At this time, it is the photoelectric conversion element disposed directly above the fulcrum stud 79 that has the smallest vertical movement amount among the photoelectric conversion elements 23i. Therefore, by setting the element 23c at one end of the image reading element (element for reading the original image in the photoelectric conversion element 23i) so as to be located directly above the fulcrum stud 79, It is possible to minimize the vertical movement of the image reading element 23c when adjusting the inclination posture of the sensor 23 in the left-right direction. in this case,
If the vertical position of the image reading element 23d at the other end is adjusted while the vertical position of the image reading element 23c at the one end is adjusted, the vertical movement of the image reading element 23c at the one end is small. The left-right orientation of the sensor 23 can be easily adjusted.

FIG. 19 is a diagram showing the positional relationship between the photoelectric conversion element 23i of the image sensor 23 and the rotating stud 41 in the left-right direction and the front-rear direction. Figure 19A shows Z1
FIG. 19B is a diagram showing the positions of the sensor substrate 24 and the image sensor 23 with respect to the rotation stud 41 when viewed in the direction (downward). FIG. Rotating stud 41
And FIG. 19C is a diagram showing a state when the image sensor 23 rotates by β from the state of FIG. 19B. When the mounting error is 0, as shown in FIG. 19B, the element 23c at one end (left end) of the image reading element is arranged at a position directly behind the rotation stud 41. That is, the left and right positions of the rotation stud 41 and the fulcrum stud 79 are set to the same position. In addition, the photoelectric conversion element 23 in which the image at one end of the reading range of the document is located directly behind the rotation stud 41.
It is designed to form an image on i (that is, the image reading element 23c). The distance between the rotating stud 41 and the photoelectric conversion element 23i in the state of FIG. 19B is set to M. In the first embodiment, the value of M is 1 mm.
Is set to.

When the rotation position around the rotation plate 17 and the rotation stud 41 of the image sensor 23 is adjusted after the substrate support plate 22 of the sensor assembly 21 is attached to the assembly attachment plate 19, the rotation plate is changed from the state of FIG. 19B. 17 (that is, the image sensor 2
Consider the case where 3) is rotated by β around the rotation stud 41 to be in the state of FIG. 19C. Then, FIG. 19B, 1
As shown in FIG. 9C, the image reading element 23c at the one end is Msin
Move β left and right. At this time, the image reading element 23c moves in the front-back direction (Z1-Z2 directions) by ± M (1-cosα) / cosα. At this time, the photoelectric conversion element 23i having the smallest amount of movement in the front-rear direction is the photoelectric conversion element disposed directly behind the rotation stud 41. Therefore, by setting the element 23c at one end of the image reading element (element that actually reads the original image in the photoelectric conversion element 23i) to be directly behind the rotation stud 41, It is possible to minimize the movement of the image reading element 23c in the front-rear direction when the tilting posture of the image sensor 23 is adjusted in the front-rear direction. In this case, by adjusting the position of the image reading element 23c at the one end in the longitudinal direction while adjusting the position of the image reading element 23c at the other end in the longitudinal direction,
The front-back posture of the image sensor 23 can be easily adjusted.

Next, the reason why M = 1 mm is explained. If M = 0 in FIGS. 19B and 19C, the position of the image reading element 23c does not move in the front-rear direction when the attitude of the image sensor 23 in the front-rear direction is adjusted (adjustment about the vertical axis). Although it seems convenient, the actual rotation fulcrum deviates from the photoelectric conversion element 23i toward the lens unit 14 or on the opposite side in consideration of the manufacturing variations of the parts, so that rotation adjustment in the same direction about the vertical axis is performed. This is because it is considered that the direction of movement of the photoelectric conversion element 23c is not constant even if the above is performed.

(Operation of First Embodiment) Next, the operation of the first embodiment having the above-described structure will be described. The sensor assembly 21, which is a replacement part, needs to be configured by connecting the sensor substrate 24 on which the image sensor 23 is mounted to the substrate support plate 22 in a predetermined positional relationship. The position of the sensor substrate 24 with respect to the substrate support plate 22 of the sensor assembly 21 is combined in a predetermined positional relationship by using an assembling jig and an optical system. In the jig and the optical system,
The optical system and assembly mounting plate 19 shown in FIG.
The same member is used. Then, the substrate supporting plate 22 of the sensor assembly 21 is fixed to a predetermined position of a member similar to the assembly mounting plate of the jig in a state where the horizontal movement and the vertical movement are impossible. At this time, the mounting position of the substrate support plate 22 with respect to the jig has the same positional relationship as when the substrate support plate 22 is positioned and mounted in the vertical and horizontal directions with respect to the actual assembly mounting plate 19 of the copying machine.

Further, in the sensor assembly 21 fixed to the jig, the connecting position of the sensor substrate 24 on which the image sensor 23 is mounted with respect to the substrate support plate 22 has not been adjusted yet. The mounting position of the sensor substrate 24 with respect to the substrate support plate 22 is adjusted as follows. (Adjustment between front and back and vertical axis)
This is performed by tightening or loosening the nut 83 with respect to the tip screw portion 93a of the adjusting stud screw 93 of the board / plate connecting means 25.

(Adjustment of Vertical and Horizontal Positions and Inclined Posture about Front-Back Axis) These adjustments are made by passing through the connecting screw through hole 24a of the sensor substrate 24 and adjusting stud screw 9
This is performed by using a connecting screw 95 screwed into the connecting screw holes 93c of the three heads. That is, the inner diameter of the through hole 24a through which the connecting screw 95 penetrates is formed to be larger than the outer diameter of the connecting screw 95, and when the connecting screw 95 is loosened (not completely tightened), the sensor Board 24
Can be moved back and forth and left and right. Therefore, with the connecting screw 95 loosened, the position of the sensor substrate 24 with respect to the substrate support plate 22 (that is, the position of the image sensor 23 with respect to the substrate support plate 22) is tilted vertically and horizontally and around the longitudinal axis. Adjust your posture. Next, the connecting screw 95 is tightened. Each sensor assembly 21
In all, the position adjustment of the sensor substrate 24 with respect to the substrate support plate 22 (that is, the position adjustment of the image sensor 23 with respect to the substrate support plate 22) is performed as described above.

When the copying machine shown in FIG. 1 is shipped, the sensor assembly 21 in which the elements 22, 23, 24 and the like are assembled in a predetermined positional relationship is mounted on the assembly mounting plate 19 by an assembly mounting screw 82. To be done. In this case, the substrate support plate 22 having a predetermined positional relationship with the image sensor 23 is fixed to the assembly mounting plate 19 in a predetermined positional relationship. This will be described below. Assembly mounting plate 19
The position of the substrate support plate 22 of the sensor assembly 21 mounted on the vertical direction is determined by the positioning projection 86f and the vertical positioning slot 91e that engages with the positioning projection 86f. The position in the left-right direction is determined by the direction-positioning cutting portion 91c. The position of the assembly mounting plate 19 in the left-right direction is also determined by the fulcrum stud 79 and the left-right positioning cutout portion 91c fitted thereto.

Therefore, when the sensor assembly 21 is mounted on the assembly mounting plate 19, the vertical and horizontal positions of the substrate supporting plate 22 of the sensor assembly 21 with respect to the assembly mounting plate 19 are fixed in a predetermined positional relationship. In this case, the substrate support plate 22
Image sensor 2 fixed in a predetermined positional relationship with respect to
The position 3 is also fixed to the assembly mounting plate 19 in a predetermined positional relationship. That is, when the sensor assembly 21 is mounted on the assembly mounting plate 19, the image sensor 23 is fixed at a predetermined position with respect to the assembly mounting plate 19.

The positional relationship in the vertical and horizontal directions between the image sensor 23 fixed at a predetermined position with respect to the assembly mounting plate 19 and the lens unit 14 is a predetermined positional relationship. Position adjustment in the optical axis direction (front-back direction) is performed by moving the lens unit 14 back and forth. This will be described below. The position of the lens unit 14 in the left-right direction on the lens unit mounting plate 47 is determined by the pair of left and right side end surfaces 52 of the lens unit supporting cutting portion 51 of the lens unit mounting plate 47. In addition, the lens unit 14
The clamping band 48 is sandwiched between the rising wall 61 of the fixing plate 49 that contacts the front end surface of the housing 46 and the front-rear positioning end surface 53 that contacts the rear end surface.
It is fixed on the lens unit mounting plate 47 by.

The lens unit mounting plate 47 and the fixing plate 49 are a pair of front and rear guide protrusions 64 on the fixing plate 49 and the lens unit mounting plate 4.
The positional relationship in the left-right direction is determined by fitting the pair of front and rear guided holes 57 in FIG. The lens unit mounting plate 47 and the fixing plate 49 are connected by the screw 59 (see FIG. 3). When the lens unit mounting plate 47 and the fixing plate 49 are connected to each other, as shown in FIG. 4, the guided hole 56 of the lens unit mounting plate 47 and the elongated hole 63 of the fixing plate 49 are the same in the left-right direction. Will be placed in the position. Lens unit mounting plate 4 connected to the fixing plate 49
The guided holes 56 of No. 7 are fitted to the unit guide protrusions 33 on the base plate 12. As a result, the lens unit mounting plate 47 and the fixing plate 49 are supported on the base plate 12 so as not to be movable left and right and to be movable back and forth.

Therefore, the positions of the fixing plate 49 and the lens unit mounting plate 47 in the left-right direction on the base plate 12 are fixed, and the portion of the lens unit mounting plate 47 for supporting the lens unit 14 is fixed. The height from the base plate 12 (the vertical position) is also fixed. Therefore, the position of the lens unit 14 in the left-right direction on the base plate 12 and the height from the base plate 12 are always held at predetermined positions if manufacturing errors are ignored.

As is clear from the above description, the base plate 12
The positions of the lens unit 14 above in the left-right direction and the vertical direction are fixed. Further, the position of the rotary plate 17 rotatable around the rotation stud 41 on the base plate 12 is also
The horizontal position is fixed. Then, the board support plate 22 whose lateral position is determined by the lateral positioning cutout portion 91c fitted to the fulcrum stud 79 of the rotary plate 17, and the image sensor 23 fixed at a predetermined position with respect to the board support plate 22. Is the base plate 1
The position in the left-right direction on 2 is fixed.

Therefore, when the sensor assembly 21 is mounted on the assembly mounting plate 19 supported by the rotary plate 17, the horizontal position of the image sensor 23 of the sensor assembly 21 corresponds to the position of the lens unit 14. Can be position. The left and right positions of the lens unit 14 and the image sensor 23 are arranged in correspondence with the left and right positions of the reading area of the largest original image. In this case, as shown in FIG. 17, the portion where the image reading light from the reading area of the original image is arranged in the central portion of the photoelectric conversion element 23i of the image sensor 23 (the photoelectric conversion element of the portion indicated by L1 in FIG. 17A). 23i
That is, when the image reading element is designed so as to converge on the image reading element, even if the horizontal position of the image sensor 23 with respect to the reading area (original arrangement portion) of the original image is biased to the left or right due to a manufacturing error, the image reading element Original images can be read by the margin elements on both sides. That is, according to the first embodiment, when the sensor assembly 21 is mounted on the assembly mounting plate 19, it is not necessary to adjust the position in the left-right direction.

In FIG. 3, the vertical axis of the sensor assembly 21 mounted on the assembly mounting plate 19 (Z1
The adjustment of the attitude around the −Z 2 axis) (that is, the adjustment of the attitude of the image sensor 23 around the vertical axis) is performed by the rotating plate 1.
7 is performed by adjusting the position around the rotating stud 41. This position adjustment is performed using the rotational position adjusting cam C shown in FIG. That is, the eccentric cam shaft C2 (see FIG. 13) is inserted into the cam shaft insertion hole 44 (see FIG. 3), and the outer peripheral surface (cam surface) of the cam portion C1 is cut off for cam fitting of the right horizontal mounting portion 76. Mate with the side edge of 76b. In this state, the knob C3 is turned to move the right horizontal mounting portion 76 of the rotary plate 17 back and forth, thereby rotating the rotary plate 17 around the rotation stud 41. When the rotary plate 17 is at a predetermined rotation position, a screw (not shown) that penetrates the screw through holes 75a and 76a (see FIGS. 12A and 2) is attached to the rotary plate fixing screw hole 43 (see FIG. 2) of the base plate 12. (Refer to), and then tighten
The rotating plate 17 is fixed at a predetermined position on the base plate 12.

The vertical position of the sensor assembly 21 and the tilted position around the fulcrum stud 79, that is, the left and right tilted positions are adjusted by rotating the position adjusting screw 18a of the vertical position adjusting means 18 (see FIG. 2). . That is,
When the position adjusting screw 18a is rotated and loosened, the assembly mounting plate 19 is raised by the coiled compression spring 18b, and when tightened, the assembly mounting plate 19 is moved.
Goes down. Therefore, the assembly mounting plate 19 can be raised or lowered by simultaneously loosening or tightening the pair of left and right position adjusting screws 18a. In addition, one of the left and right position adjusting screws 18
By rotating a or loosening one and tightening the other, the posture of the assembly mounting plate 19 in the left-right direction (the inclination around the fulcrum stud 79) can be adjusted. Since the sensor assembly 21 moves integrally with the assembly mounting plate 19, it is possible to adjust the vertical position of the image sensor 23 of the sensor assembly 21 and the tilted posture in the horizontal direction by the position adjusting screw 18a.

As can be seen from FIG. 18C, the lateral position of the photoelectric conversion element 23c is adjusted to Nsin by adjusting the tilted posture of the image sensor 23 around the fulcrum stud 79.
19C, the position of the photoelectric conversion element 23c in the left-right direction is moved in the left-right direction by Msinβ by adjusting the rotation posture around the rotation stud 41, as can be seen from FIG. 19C. However, the lateral displacement (error) of the photoelectric conversion element 23i caused by these movements and the lateral displacement (error) of the image sensor 23 relative to the original reading position on the original surface due to the manufacturing error are all shown in FIG.
It is absorbed by the margin elements provided on both sides of the photoelectric conversion element 23i shown in FIG.

As described above, the sensor assembly 21
Is mounted on the assembly mounting plate 19 of the copying machine, and the front and rear positions of the lens unit 14, the rotating position of the rotating plate 17, the vertical position of the assembly mounting plate 19 and the tilting direction in the horizontal direction are adjusted, and then the copying machine is shipped. To be done.

In the case where the shipped copying machine is roughly treated and is subjected to a shock or the like, the vertical position adjusting means 18 is used.
The assembly mounting plate 19 supported by the rotary plate 17 via the compression spring 18b (see FIG. 2) together with the sensor assembly 21 mounted on the assembly mounting plate 19 is moved in the direction indicated by the chain double-dashed line in FIG. When the rocking prevention projection 91b extends downward through the rocking prevention hole 77b as shown in FIG. 11, the rocking prevention projection 91b will be rocked. It abuts the rear edge of the rear end to prevent a large swing.

In FIG. 11B, each dimension is expressed as follows. t1: Thickness of the upper horizontal wall 87 of the assembly mounting plate D1: Inner diameter of the position adjusting elongated hole 87a formed in the upper horizontal wall 87 in the front-rear direction d1: The position adjusting elongated hole of the position adjusting screw 18a 87
a Outer diameter of the portion arranged inside a: K: distance between the rear surface of the substrate support plate 22 and the rear end surface of the swing prevention hole 77b r1: distance between the center of the long hole 87a for position adjustment and the rear surface of the substrate support plate r2 : Center of the long hole 87a for position adjustment and the lower horizontal wall 77
Distance from bottom

In this case, the assembly mounting plate 19 and the sensor assembly 2 mounted thereon due to the impact.
When 1 swings, the upper horizontal wall 87 of the assembly mounting plate 19 changes from the state of FIG. 11C to the state of FIG. 11D. In the state of FIG. 11D, the long hole 8 for position adjustment
The lower front end and the upper rear end of 7a are in contact with the outer peripheral surface of the position adjusting screw 18a. The swing angle of the assembly mounting plate 19 at this time is P. In the case of the first embodiment, if the assembly mounting plate 19 is swung by the swing angle P or more, the position adjusting elongated hole 87a may be damaged. Therefore, when the swing angle of the assembly mounting plate 19 is equal to or less than P, the rear surface of the substrate support plate 22 is engaged with the rear end surface of the swing prevention hole 77b so that the r
By setting the values of 1, r2 and K, the swing angle of the assembly mounting plate 19 can be reduced. In this case, since it is possible to prevent excessive swing due to the impact or the like, it is possible to prevent damage to the position adjusting elongated hole 87a or damage to the C-shaped spring 81.

While using the copying machine, the sensor assembly 2
If one fails, it will need to be replaced.
To replace the sensor assembly 21 in that case, the old sensor assembly 21 is removed from the assembly mounting plate 19 and the new sensor assembly 21 is mounted to the assembly mounting plate 19. It is not necessary to adjust the position of the sensor assembly 21 in the horizontal direction at that time for the reason described above. Further, at that time, the position adjustment of the sensor assembly 21 in the optical axis direction (X1-X2 direction), the position adjustment about the vertical axis, the vertical position adjustment, and the adjustment of the left and right tilted postures are performed.
Since it is carried out in the sensor assembly 21 mounted on the jig having the same structure as the image reading apparatus of the present embodiment, it is usually unnecessary to carry out.

Strictly speaking, an adjustment error in the sensor assembly 21 and a fulcrum stud 79 when the sensor assembly 21 is mounted on the assembly mounting plate.
Outer diameter and right-left positioning cutout portion 91 fitted to it
Due to the difference between the inner diameter of c and the outer diameter of the assembly mounting screw 82 and the inner diameter of the assembly mounting screw hole 86g with which the assembly mounting screw 82 is screwed, an error occurs in the mounting position of the sensor assembly 21. There is. However, in the present embodiment, those errors actually do not cause a problem, and the position adjustment does not usually need to be performed. However, when more strict adjustment is made according to the customer's request, it can be adjusted as follows. That is, the position of the sensor assembly 21 in the optical axis direction (X1-X2 direction) is adjusted by adjusting the position of the lens unit 14, the position around the vertical axis is adjusted by adjusting the rotational position of the rotary plate 17, and The vertical position adjustment and the left and right tilt posture adjustment are performed by adjusting the position adjusting screw 18a. Even when this strict adjustment is performed, the position adjustment of the image sensor 23 (position adjustment of the photoelectric conversion element 23i) is simple and easy because there are few adjustment items.

According to the first embodiment, since the lateral position of the sensor assembly 21 is determined by the fulcrum stud 79 of the rotary plate 17, even if there is an error in the mounting position of the assembly mounting plate 19 with respect to the rotary plate 17, it is affected. Not done.

20 and 21 are explanatory views of the second embodiment of the present invention. FIG. 20 is a diagram corresponding to FIG. 4 of the first embodiment,
FIG. 21 is a diagram corresponding to FIG. 5 of the second embodiment. In the second embodiment, the lens unit fixing means 13 and the light shielding plate 1 are used.
The structure is the same as that of the first embodiment except that the structure of 5 is different. In the second embodiment, the light shielding plate 15 is omitted, and instead, in the lens unit fixing means 13, the rising wall 61 of the fixing plate 49 that contacts the front end surface of the housing 46 is configured as a light shielding plate. That is, the rising wall 61 extends to the center of the rear surface of the lens unit 14, and a cut-off portion 61a for passing light is formed at a position corresponding to the center of the rear surface of the lens unit 14. In other respects, the image reading apparatus of the second embodiment has the same structure as the image reading apparatus of the first embodiment.
According to the second embodiment, since the light shielding plate 15 of the first embodiment can be omitted, the number of parts can be omitted. In addition, the number of man-hours required for manufacturing can be reduced.

(Modifications) Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, but is within the scope of the gist of the present invention described in the claims. Thus, various changes can be made. A modified embodiment of the present invention is illustrated below.

(H01) The front-rear positioning end surface 53 of the housing 46 of the lens unit 14 is provided on the upper surface of the lens-unit mounting plate 47, instead of being provided on the lens-unit supporting cutout portion 51, as an abutting surface of another member. Can be used, and the front-back positioning end face 53 can be used.
Can also be arranged to abut the rear end surface of the housing instead of the front end surface. In this case, the rising wall 6
1 may be arranged on the front side of the housing 46. (H02) The rocking prevention device may employ various structures other than those shown in the embodiment as long as it has a function of preventing the assembly mounting plate 19 and the sensor assembly 21 mounted thereto from rocking. It is possible. For example, the rocking prevention protrusions 91b can be provided on the assembly mounting plate 19 instead of being provided on the substrate supporting plate 22, and the positions where they are provided can also be provided on both left and right end portions other than the lower end. Further, a member that engages with the rocking prevention protrusion to prevent the assembly mounting plate 19 from rocking has a shape other than the shape of the rocking prevention hole 77b (for example, the base plate 12).
It is possible to employ a member that is fixed to and that engages with the rocking prevention protrusion. (H03) Positioning of the sensor assembly 21 in the left-right direction may be performed using a positioning member provided on the assembly mounting plate 19 instead of using the fulcrum stud 79 provided on the rotating plate 17. (H04) In the plate lateral positioning means for supporting the substrate support plate 22 with respect to the rotary plate 17 by horizontal studs for fulcrum so as not to be able to move left and right and to be rotatable and vertically movable, the stud for fulcrum is provided on the rotary plate 17. Instead of providing it, it can be provided on the assembly mounting plate 19 which is positioned and fixed in the left-right direction with respect to the rotating plate 17. It is also possible to provide a fulcrum stud on the substrate support plate 22 and to provide a guide hole on the rotary plate 17 or the assembly mounting plate 19 for supporting the fulcrum stud so as not to be movable left and right and vertically. (H05) As a method of supporting the rotary plate 17 on the base plate 12 so that the rotational position around the rotation fulcrum can be adjusted, instead of providing the rotary stud 41 on the base plate 12, the rotary plate 17 is projected downward. It is also possible to provide a rotating stud for the rotation and a fitting hole on the base plate 12 into which the rotating stud is fitted.

[0091]

The image reading apparatus of the present invention described above can achieve the following effects (E01) and (E02). (E01) To make it possible to easily fix a lens unit composed of an imaging lens and a cylindrical housing that houses the imaging lens at a predetermined position. (E02) To make it possible to easily adjust the fixed position of the lens unit in the optical axis direction.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an image reading apparatus of a digital copying machine to which the present invention is applied.

FIG. 2 is an exploded perspective view of a main part of this embodiment.

FIG. 3 is a plan view of the same embodiment.

FIG. 4 is an enlarged view of the lens unit fixing means 13 and the lens unit 14 shown in FIGS.

5 is an exploded perspective view of the lens unit fixing means 13 and the lens unit 14 shown in FIG.

6 is an explanatory view of a lens unit mounting plate of the lens unit fixing means 13 shown in FIG.

FIG. 7 is a plan view of a fixing plate of the lens unit fixing means 13 shown in FIG.

8A and 8B are explanatory views of an assembly mounting plate supported by the assembly mounting plate supporting device of the embodiment and a sensor assembly mounted on the assembly mounting plate. FIG. 8A is a rear view and FIG. 8B is a side view.

9 is a sectional view taken along line IX-IX of FIG. 8A.

10 is a sectional view taken along line XX of FIG. 8A.

11 is an explanatory view of a rocking prevention device, and FIG.
11A is a sectional view taken along line XIA-XIA of FIG. A8, FIG. 11B is an enlarged view of a main part of FIG. 11A, and FIG. 11C is a diagram showing a state different from FIG. 11B.

12A and 12B are explanatory views of the rotary plate 17 of the assembly mounting plate supporting device of the embodiment, FIG. 12A is a top view, and FIG. 12B is a rear view.

FIG. 13 is an explanatory view of a rotational position adjusting cam C used for adjusting the rotational position of the rotary plate 17,
FIG. 13A is a perspective view of the rotational position adjusting cam C, and FIGS.
3C is an explanatory view of its action.

14A and 14B are explanatory views of the assembly mounting plate 19 of the embodiment, FIG. 14A is a top view, and FIG. 14B is a rear view.

FIG. 15 is a sectional view taken along line XV-XV of FIG.

16 is an explanatory view of the substrate support plate 22 of the sensor assembly 21, FIG. 16A is a top view, and FIG.
Is a rear view.

FIG. 17 is an explanatory diagram of a photoelectric conversion element 23i of the image sensor 23 of the sensor assembly 21,
FIG. 17A is an explanatory diagram of a state in which the reading range of the document and the position of the image sensor 23 in the left-right direction are arranged as set (state of manufacturing error 0), and FIG. 17B is the image sensor 2.
It is explanatory drawing of the state where the position of 3 was shifted to the right.

18 is a diagram showing a positional relationship between the photoelectric conversion element 23i of the image sensor 23 and a fulcrum stud 79 in the left-right direction and the up-down direction, and FIG. 18A shows X1.
FIG. 18B is a diagram showing the positions of the substrate support plate 22 and the image sensor 23 with respect to the fulcrum stud 79 when viewed in the direction (forward). FIG. 18B shows the image sensor 23 and the fulcrum stud 79 when the image sensor 23 is in the horizontal posture. FIG. 18C is a diagram showing a positional relationship, and FIG. 18C is a diagram showing a state when the image sensor 23 is rotated by α from the state of FIG. 18B.

FIG. 19 is a diagram showing a positional relationship between the photoelectric conversion element 23i of the image sensor 23 and the rotating stud 41 in the left-right direction and the front-rear direction. Figure 19A shows Z1
19B is a diagram showing the positions of the sensor substrate 24 and the image sensor 23 with respect to the rotation stud 41 when viewed in the direction (downward), and FIG. Stud 41
And FIG. 19C is a diagram showing a state when the image sensor 23 rotates by β from the state of FIG. 19B.

20 is an assembled perspective view of another embodiment of the lens unit fixing means 13 and the lens unit 14 shown in FIG.

FIG. 21 is an exploded perspective view of another embodiment of the lens unit fixing means 13 and the lens unit 14 shown in FIG.

FIG. 22 is a schematic vertical sectional view of an image reading apparatus of a digital copying machine to which the present invention is applied.

23 is an explanatory view of the operation of the image reading apparatus of FIG. 20, and is a plan view showing an optical path of reflected light from the surface to be read of the document.

FIG. 24 is an explanatory diagram of attitude adjustment items of the image sensor of the conventional image reading apparatus.

[Explanation of symbols]

12 ... Base plate, 13 ... Lens unit fixing means, 14 ... Lens unit, 17 ... Rotating plate, 18 ... Vertical position adjusting means, 18a ... Position adjusting screw, 18b ... Compression spring, 19
... Assembly mounting plate, 22 ... Substrate supporting plate,
23 ... Image sensor, 23i ... Photoelectric conversion element, 24 ...
Sensor substrate, 25 ... Plate connecting means, 41 ... Rotation fulcrum (rotation stud) 46 ... Housing, 47 ... Lens unit mounting plate, 51 ... Lens unit supporting cutout portion, 52 ... Side end surface, 53 ... Positioning end surface, 61 ... Positioning plate, 74 ... Vertical wall, 74a ... Light passing cutout section, 78 ... Upper horizontal wall, 78a ... Position adjusting screw hole, 7
9 ... fulcrum stud, 81 ... biasing means (C-shaped spring),
86 ... Vertical wall, 86a ... Light passing cutout part, 87 ... Upper horizontal wall, 87a ... Position adjusting screw through hole, 91a ... Light passing cutout part, (77b + 91b) ... Swinging means, (79 + 91)
c) ... Plate horizontal direction positioning means, (86f + 91
e) ... Vertical positioning means,

Claims (3)

[Claims] 1. A base plate having an upper surface extending in the front-rear direction and the left-right direction, an imaging lens for converging image reading light incident from the front toward a rear imaging position, and a housing for housing the imaging lens. An image reading apparatus comprising: a lens unit having the lens unit; and a lens unit fixing means for fixing the lens unit on the base plate in a positionally adjustable manner. An image reading apparatus having the following requirements: Y01) The housing of the lens unit has a cylindrical outer peripheral surface, (Y02) The lens unit fixing means includes a pair of left and right side end surfaces that support the outer peripheral surface of the housing, and positioning end surfaces perpendicular to the pair of side end surfaces. And a lens unit mounting plate having a cutout for supporting the lens unit formed thereon, and pressing the one end surface of the housing so that the other end surface is positioned above the position. Housing positioning means for abutting against the end face for determination, a tightening band made of a leaf spring for fixing the housing to the lens unit mounting plate, and a position in the front-back direction for mounting the lens unit mounting plate on the base plate. And a plate fixing means for adjusting and fixing. 2. The image reading device according to claim 1, wherein the plate fixing means is arranged so that the lens unit mounting plate cannot be adjusted in the left-right position and the front-back position can be adjusted. A fixing plate to be mounted, means for guiding the lens unit mounting plate in the front-rear direction on the base plate, and means for fixing the fixing plate on the base plate. 3. The image reading apparatus according to claim 1, wherein the housing positioning means is raised from the fixing plate to support the lens unit. The positioning plate is configured to come into contact with the end surface of the housing supported by the cutout portion.