JPH033555A - Position adjustment mechanism for picture reader - Google Patents

Abstract

PURPOSE:To minimize the position deviation even at the replacement of a photoelectric conversion element (CCD) by providing a positioning section of the CCD to an opening of a metallic plate and filling a adhering support resin agent to the gap between the surrounding of the CCD and the opening of the metallic plate. CONSTITUTION:A CCD 2 of a CCD unit 20 is inserted in a position hole 21g of nearly rectangular shape provided to a metallic plate 21, and subscanning direction reference ridges 21b, 21c and a main scanning direction reference ridge 21a are positioned accurately with respect to two mount holes 21e provided to the metallic plate 21 and picture element arrays of the CCD 2 are positioned with prescribed accuracy. Moreover, 2-liquid epoxy resin is injected and cured to the gap between the ceramic case of the CCD 2 and the positioning hole 21g to prevent the CCD 2 from being moved. Thus, even at the replacement of the CCD, deformation or distortion of the metallic plate is prevented and the position deviation is minimized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides photoelectric conversion of an original image by relatively moving an original image projected by an imaging lens and a photoelectric conversion element for reading the original image in the sub-scanning direction. The present invention relates to a position adjustment mechanism for an image reading device that reads images.

[Prior Art] In recent years, optical reading devices for document images have been widely used in office equipment such as copying machines and facsimile machines. The size of documents to be read in general is limited to a maximum of A3 size,
In certain fields such as industrial drawings, the target manuscript size is 841mm (JISAO size) to 3mm in width.
Some are larger, such as 6# (941m+) (ANSI E size). For such large documents, one photoelectric conversion element (hereinafter referred to as CCD) is required.
It is impossible to reduce and project an image and read it, and conventional reading devices for general office use cannot read with sufficient image density.

Therefore, an apparatus has been proposed in which a large document image is dividedly projected onto a plurality of CCDs using a plurality of imaging lenses, and the image is read in correspondence with each projected image.

[Problems to be Solved by the Invention] However, in such a split-type reading device, for example, the CCDs are positioned and arranged so that the main scanning direction of each CCD is completely aligned with the width direction of the document image. , it is impossible to photoelectrically read an am image unless the original image and the photoelectric conversion element are moved relative to each other in the sub-scanning direction. In particular, for high-density CCD linear sensors used when high-density reading is required, highly accurate position adjustment must be performed in relation to the projection magnification or reading overlap amount for each CCD, as well as temperature changes. .

Conventionally, Japanese Patent Application Laid-open No. 51-51217, Japanese Patent Application Laid-open No. 60
Although various CCD support structures have been proposed in Japanese Patent Publication No. 187174, Japanese Patent Publication No. 62-48940, and Japanese Patent Publication No. 62-268263, none of them sufficiently meet the above-mentioned requirements.

The present invention provides a CCD with sufficient mechanical strength.
The position of the image reading device allows for highly accurate positioning and minimizes positional deviation even when replacing the COD! The purpose is to provide a 181 adjustment mechanism.

[Means for Solving the Problem] In order to achieve the above object, the invention described in claim 1 projects a document image onto a photoelectric conversion element using an imaging lens, and combines the document image and the photoelectric conversion element. In the position adjustment mechanism of the image reading device, the photoelectric conversion element is loosely fitted into the opening of the metal plate, and the photoelectric conversion element is loosely fitted into the opening of the metal plate. The opening of the plate is provided with a positioning part for the photoelectric conversion element that comes into contact with the photoelectric conversion element as a reference position in the main scanning direction and the sub-scanning direction, and between the periphery of the photoelectric conversion element and the opening of the metal plate. The photoelectric conversion element is adhesively held by filling the portion with a resin agent.

Further, the invention described in claim 2 projects a document image onto a photoelectric conversion element using an imaging lens, and
In the position adjustment mechanism of the image reading device, in which the document image and the photoelectric conversion element are moved relative to each other in the sub-scanning direction to photoelectrically read the document image, the photoelectric conversion device is loosely fitted into the opening of the metal plate. At the same time, the opening of the metal plate is provided with a positioning part for the photoelectric conversion element that contacts the photoelectric conversion element as a reference position in the main scanning direction, the sub-scanning direction, and the optical axis direction of the imaging lens. and a portion between the periphery of the photoelectric conversion element and the opening of the metal plate is filled with a resin agent, whereby the photoelectric conversion element is adhesively held.

[Function] In the means described in claim 1 having such a configuration, the photoelectric conversion element is positioned at the reference position in the main scanning direction and the sub-scanning direction by the positioning section provided in the opening of the metal plate. is positioned, and this CCD is securely held by a resin agent.

In addition, in the means described in claim 2, which has a structural acid, photoelectric conversion is performed at reference positions in the main scanning direction, sub-scanning direction, and optical axis direction by the positioning part provided in the opening of the metal plate. This CCD
is ensured to be held in place by the resin.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, a document 12 is illuminated by a long illumination lamp 11, and an image on the document 12 is thereby formed in an exposure line 13 by three imaging lenses 4,
5.6, one-dimensional photoelectric conversion device (hereinafter referred to as CCD)
(abbreviated as )) is projected onto a pixel column of 1.2°3.

Each light beam 7°8.9 in the imaging lenses 4, 5.6 is transmitted to a predetermined area Q1□-'l in the exposure line 13.
23 are overlapped, and the CCDI, 2.
When the read signal according to No. 3 is output to a writing device (not shown), control is performed so that omissions, duplications, shifts, etc. do not occur at predetermined positions in each overlap area.

The document 12 is conveyed by a conveying means (not shown) along an exposure line 13 on a transparent flat glass plate from its leading edge to its trailing edge in the direction of the arrow shown in the figure at a speed corresponding to a predetermined reading speed. This allows all images of the document to be read.

Further, as shown in FIG. 2, the area Q2 on the exposure line 13 of the JM document 12 is 0.0.
It is reduced in size by 1102 times and is imaged on a pixel column of CCD2. The CCD 2 is a linear sensor having 5000 pixels of 7 μm×7 μm, and the length of one pixel row is set to 35+1111. Therefore, the length of the region Q2 is 317.
It will be made 5in. Here, the width on the exposure line 13 of the original 12, that is, the maximum reading width 2, is 914.4 nm.
Then, the amount of overlap on the exposure line 13 Q1□
-Q2. is 6.35 mm, and pixel row 2 of CCD 2
The upper diameter of a is 0.7 mm (100 pixels).

In this way, the image of the original 12 is converted into multiple CODs 1.

In order to read the image separately according to 2.3, each CCDI, the reading magnification 1 position of the read image in 2.3,
The range etc. needs to be positioned with a predetermined accuracy. Therefore, in this embodiment, as shown in FIG.
The position of 2 is movable for parallel fine adjustment in each direction: the X-axis direction which is the main scanning direction, the Y-axis direction which is the sub-scanning direction, and the X-axis direction which is the optical axis direction of the imaging lens 5. , can be rotated and moved around each of the X-axis direction, Y-axis direction, and X-axis direction for fine adjustment.

As shown in FIGS. 3, 4, and 5, the reading unit 15 has an imaging lens 5 with respect to the base 200.
A base plate 100 having a U-shaped cross section is mounted for parallel fine adjustment movement in the optical axis direction (X-axis direction). , and a rotary base plate 80 mounted for fine rotational adjustment around a conical shaft 94 having an axis in the sub-scanning direction; a shading correction plate 97 movably screwed to the
The optical center of the imaging lens 5 is screwed to approximately the center of the front side wall 80c of the rotary base plate 80 so as to allow fine rotational adjustment around a conical shaft 94 having an axis perpendicular to the optical axis and in the sub-scanning direction. A support shaft 64 is provided between the lens unit 300 and the right boss 81 and left boss 82 screwed to the lower parts of the right side wall 80a and left side wall 80b of the rotating base plate 80. , and a CCD base plate unit 30 mounted on the support shaft 64 so as to be finely adjustable in rotation and finely adjustable in the axial direction.

The CCD unit 20 is held in the CCD base plate unit 30, and a sealing member 310 having light-shielding properties, dust-proofing properties, and air permeability is installed between the CCD unit 20 and the lens unit 300. .

Further, as shown in FIGS. 14, 15, and 16, the base 200 is connected to the exposure line 13 of the original image.
The left support frame 230 is provided as an immovable member.
It is rotatably supported on the right support frame 231 via an upper left shaft 215 and a right main shaft 217. The rotation plane is set to a plane that includes the optical center of the imaging lens 5 and is perpendicular to the optical axis of the imaging lens 5, and the left main axis 215 and the right main axis 217 are in the main scanning direction of the CCD, that is, It has an axis in a direction parallel to the exposure line 13. Further, two stop shafts 214 are provided on both sides of the left main shaft 215 in the direction perpendicular to the axis, and when these stop shafts 214 are tightened or loosened by set screws 222 and 223, the base 200 is rotated. The movement can be fine-tuned.

The CCD 2 of the CCD unit 20 is fitted into a substantially rectangular positioning hole 21g provided in the metal plate 21, as shown in FIGS. 7 and 8. Three support pieces are formed at the edge of the positioning hole 21g to protrude inward, and a main scanning direction reference edge 21a and a sub-scanning direction reference edge 21a are formed at the tips of each of these support pieces. With respect to the direction reference edges 21b and 21c, the above C
The end face in the main scanning direction and the end face in the sub-scanning direction of the ceramic case of the CD 2 are held in contact with each other. Furthermore, the main scanning direction reference edge 21a and the sub-scanning direction reference edge 2 are connected to the two mounting holes 21e provided in the metal plate 21.
1b and 21c are accurately positioned, so that the pixel column 2a of the CCD 2 is positioned with a predetermined accuracy. At this time, the cover glass 2b of the CCD 2
and the upper surface of the metal plate 21 are positioned on the same plane. Furthermore, a two-component epoxy resin is injected and hardened into the gap between the ceramic case of the CCD 2 and the positioning hole 21g, so that the CCD 2 remains immovable.

Further, the COD control board PCB-122, which includes an amplification circuit for amplifying the image reading signal from the CCD 2,
It is held by soldering to two connecting pins 2c.

There are two connectors 23 on the COD control board PCB-122.
is soldered and consists of multiple lead wires.
Cables 24 are each detachably attached. C
Mounting hole 22 provided on OD control board PCB-122
A thermistor 25 for detecting the temperature of the CCD 2 is attached to the a, and the thermistor 25 is attached to the ceramic case of the CCD 2 and held in contact with the ceramic case using an epoxy resin.

Furthermore, the COD control board PCB-122 has a connector 23.
is soldered, and one end of a flat cable 24 is inserted into this connector 23. The other end of the flat cable 24 is connected to a COD control board PC.
It is inserted and connected to a connector 401 soldered to the B-2400 (see FIGS. 3 and 5). The CCD control board PCB-2400 constitutes the immediate control circuit of the CCD 2, and is larger than the CCD control board PCB-122 and is equipped with more control electronic components, so it generates heat. It's also big. Therefore, it is desirable that this COD control board PCB-2400 is installed as far away from the CCD 2 as possible. screw 404
By being locked by the CCD control board PCB-1
The heat generated by the CCD 22 is prevented from affecting the CCD 2.

The CCD control boards PCB- which are spaced apart from each other in this way
If the 122 CCD control board PCB-2400 is connected with the flat cable 24, it is conceivable that electrical noise will be picked up through the flat cable 24, making it impossible to output accurate signals corresponding to the original image. However, in this embodiment, as mentioned above, the CCD
The CCD control board PCB-122, which is directly connected to 2, has a read signal amplification function, thereby minimizing the influence of electrical noise. As a result, the flat cable 24 can be lengthened to a certain extent, which alleviates the positional restrictions on the COD control board PCB-2400, and at the same time, even if the position of the CCD 2 is adjusted over a relatively large range, unreasonable force is not applied to the CCD 2. Flat cable 24 and connector 2 without any load
3,401 can be eliminated.

9 and 10 show other mounting structures for the CCD 2. In other words, in the green part of the positioning hole 21g,
Main scanning direction reference edge 21a and sub scanning direction reference edge 21b
, 21c, there are three optical axis direction reference edges 21f, and C with respect to these optical axis direction references, Q21f.
The cover glass 2b of 0D2 is brought into contact and positioned. A two-component epoxy resin is injected and hardened into the gap 21d between the ceramic case of the CCD 2 and the positioning hole 21g, so that the CCD 2 remains immovable. In this way, positioning of the C0D2 with respect to the metal plate 21 in the optical axis direction can be facilitated.

Further, FIG. 11 shows another mounting structure for the CCD control board PCB-122. That is, CCD control board P
A socket 26 is connected to the CB-122 via a connecting pin 26a, and a connecting pin 2c of the CCD 2 is inserted into the socket 26. In this way, by inserting the connecting pin 2c of C0D2 into the socket 26, you can replace the CCD2 or
It is possible to easily and inexpensively replace the D control plate PC[3-122.

Next, the lens unit 300 will be explained with reference to FIGS. 13, 5, and 3. The lens holder 301 is formed of aluminum casting in the shape of a broken circuit, and the rear part 301b of the lens holder 301 has three protrusions 30.
1e is formed, and an attachment hole 303 to the rotating white plate 80 is also formed. The protruding tip plane portion of the convex portion 301e and the holder lower surface portion 301d are cut so as to have a perpendicular relationship, and further, based on these surfaces 301e and 301d, f<, 14,
A fitting hole 304 for accommodating the imaging lens 5 is formed penetrating toward the optical axis direction. In other words, the J-marked fitting hole 304
The axis of the holder bottom surface 301 of the lens holder 301
The surface angle with d and the parallelism with the flat surface of the protruding tip of the convex portion 301e are accurately positioned. The imaging lens 5 is fitted into the fitting hole 304 so as to be slid back and forth in the direction of its optical axis.

Further, a fitting hole 302 is formed in the rear part 301b of the lens holder 301, into which the outer circumference of the cylindrical female thread 95 is fitted. The above-mentioned cylindrical female thread 95 is.

The conical shaft 94 is locked to the front wall 80c of the rotating base plate 8o. At this time, the formation position of the fitting hole 302 is precisely set on the optical center of the imaging lens 5 in a direction perpendicular to the optical axis of the lens and perpendicular to the flat surface of the protruding end of the convex portion 301e. There is. On the other hand, a movable base plate 50 holding the CCD base plate unit 30 is rotatably and slidably supported on the support shaft 64, and the lens unit 300 can be rotated and adjusted around the fitting hole 302. After the holder lower surface 301d is set parallel to the support shaft 64, the rotating base plate 8 is fixed with three screws 309.
It is set to be locked at 0. This ensures the required perpendicular precision between the optical axis of the imaging lens 5 and the support shaft 64.

Further, the tip of the plate spring 325 screwed to the front part 301a of the lens holder 301 is connected to the imaging lens 5.
The imaging lens 5 is pressed against the upper edge of the lens 5, so that the imaging lens 5 is suppressed downward in the optical axis direction.

A fitting hole 305 is formed in the front part 301a of the lens holder 301 in a direction perpendicular to the lens optical axis.
A focus adjustment shaft 306 is rotatably fitted into the fitting hole 305 for finely adjusting and moving the imaging lens 5 in the optical axis direction for focusing and locking. Further, a screw hole 301f is formed in the front part 301a of the lens holder 301 so as to be perpendicular to the axis of the fitting hole 305, and a pressure rod 307 loosely fitted into the screw hole 301f is screwed into the screw hole 301f. 308, the focus adjustment shaft 306 is pressed in a direction perpendicular to the axis, thereby locking the focus adjustment shaft 306 at a predetermined position as described later. The pressure rod 307 is made of a hard resin with increased flexibility.

On the other hand, a groove 322 of a predetermined depth is formed in an annular shape on the outer periphery of the lens barrel 321 of the imaging lens 5.
A cylindrical eccentric cam 306a is formed at the rear end of the focus adjustment shaft 306, and this eccentric cam 306a is engaged in the groove 322. The eccentric cam 306a is formed to have a diameter of 81 TIIl, and the focus adjustment shaft 306
The main shaft 306c is eccentric by 1.5 volumes with respect to the axis of the main shaft 306c, and the length in the axial direction is set to be longer than the depth of the groove 322. focus! I! Main shaft 306c of i'll shaft 306
is formed into a cylindrical shape with a diameter of 12nu, and a conical portion 306d with an apex angle of 90° is formed on the opposite side of the eccentric cam 306c, and this conical portion 306d is connected to the small diameter shaft 3.
It is integrally connected to the auxiliary shaft 306f via 06e. The auxiliary shaft 306f is formed to have the same diameter as the main shaft 306c, and a slotted portion 306g into which a driver can be fitted is formed on the end face of the auxiliary shaft 306f. The above-mentioned pressure rod 307 is attached to the conical inclined side surface of the conical portion 306d.
A conical portion 307a formed at the tip is pressed against the conical portion 307a. The component forces P and P2 of the pressing force of the pressure rod 307 at these pressure contact points are directed in the axial direction and the direction perpendicular to the axis of the focus adjustment shaft 306, respectively.
The tip surface 30 of the eccentric cam 306a is
6b is pressed against the groove bottom surface 322a of the groove 322, so that the lens barrel 321 is pressed against the wall surface of the fitting hole 304 and maintained without play. In addition, the main axis 30 of the focus adjustment shaft 306 is
6c and the auxiliary shaft 306 are pressed against the wall surface of the fitting hole 305 and maintained without play, and rotation of the focus adjustment shaft 306 is braked by frictional force. At this time, the end surface 306b of the eccentric cam 306a exerts a pressing force on the groove bottom surface 322a, that is, the lens barrel 321
The frictional force between the fitting hole 304 and the fitting hole 304 is based on the pressing force from the set screw 308 against the pressure rod 307, but at least when the imaging lens 5 focuses the projected image on the CCD 2, the lens mirror The pressing force from the set screw 308 against the pressure rod 307 is adjusted to such an extent that the frictional force between the barrel 321 and the fitting hole 304 does not become greater than the pressing force exerted by the leaf spring 325 on the lens barrel 321.

To adjust the focus of the imaging lens 5, first, a driver is engaged with the slotted portion 306g and the focus adjustment shaft 306 is rotated. As a result, the eccentric cam 306a is eccentrically rotated, and the imaging lens 5 is moved in the optical axis direction, so that the CCD 2
The focus of the projected image is adjusted. At this time, the imaging lens 5 is prevented from rotating around the optical axis by the suppressing force of the leaf spring 325, and the groove 3
The groove side surface 322b of No. 22 is maintained in pressure contact with the cam surface of the eccentric cam 306a.

As a result, the imaging lens 5 is always movable for fine focusing adjustment in the most desirable direction for reading the original image, that is, in the direction to eliminate unilateral point blur in the main scanning direction, and at this time, in the optical axis direction. is maintained in a state of no play.

After the focusing is completed, the set screw 308 is further screwed in to increase the above-mentioned axial component force P□ and axis orthogonal component force P2, thereby causing the imaging lens 5 to be misaligned with respect to the lens holder 301. The focus adjustment shaft 306 is reliably locked and the rotation of the focus adjustment shaft 306 is restrained.

Next, regarding the CCD2 position adjustment mechanism, see Figures 3 and 4.
The explanation will be given based on FIG. 5, FIG. 12, FIG. 18, and FIG. 19.

First, in the tilt adjustment mechanism in the X-axis direction, which is the main scanning direction of the CCD 2, that is, the rotational fine adjustment mechanism around the Y-axis α, and the rotational fine-adjustment mechanism around the Z-axis Y, which is the optical axis direction of the imaging lens 5.
As described above, the CCD unit 20 having the metal plate 21 that holds C0D2 at a constant reference position is mounted on two circular pedestals 31d formed on the upper surface of the channel 31 corresponding to the two reference mounting holes 21e. It is fixed by screwing in a screw pin 32. This allows CCD
2 can be easily replaced within a positional deviation range of 200 to 300 μm.

The CCD control plate P (1:El-122) is positioned so as to protrude downward from a rectangular mounting hole 31a formed in the channel 31.

A substantially cylindrical horizontal shaft 33 is attached to the lower surface side of the right end portion of the channel 31 in the X-axis direction in FIG. 12 so as to extend in the Y-axis direction. This horizontal axis 33 is
Both end portions are cut out into a substantially semi-cylindrical shape, and the plane portions of the semi-cylindrical cutout portions 33C are brought into contact with the lower surface side of the channel 31 and tightened by countersunk screws 34.

Further, two conical portions 33a are formed at the center of the horizontal shaft 33 so as to face each other, and both of these conical portions 33a are inserted into a rectangular notch 31c formed in the channel 31. is housed in. On the other hand, on the upper surface side of the right end portion in FIG. 12 in the X-axis direction of the movable base plate 50, a vertical shaft 35 is erected in the Z-axis direction (optical axis direction).
A cylindrical portion 35a formed at the upper end portion of this vertical shaft 35
The lower outer circumferential edge of is in contact with the conical inclined side surfaces of two conical portions 33a formed on the horizontal shaft 33. As a result, the channel 31 including the CCD unit 20
The entire body is rotatable about a horizontal axis 33 and a vertical axis 35.

A square bar 38 is fastened to the left end portion of the channel 31 in the X-axis direction in FIG. They are screwed together. This iAa screw 39 passes through a large diameter hole (not shown) formed in the channel 31 and projects downward, and its spherical tip portion 39a faces the upper surface of the movable base plate 5o having a U-shaped cross section. 50
It is in contact with i.

On the other hand, stepped pins 36a and 36b are provided on the front wall 31e and rear wall 31f of the channel 31 in the Y-axis direction.
are respectively screwed in the vicinity of the square rod 38, and the upper ends of tension springs 37a and 37b are hung on these stepped pins 36a and 36b, respectively. The lower ends of the tension springs 37a and 37b are hung on stepped pins 54a and 54b screwed onto the front wall 50g and rear wall 50h of the movable base plate 50, respectively. These tension springs 37a and 37b
The square bar 38 extends obliquely at an angle of about 45 degrees with respect to the two axes (optical axis), and its tensile force causes the square bar 38 to
A component force is generated inside the vicinity that presses the channel 31 downward and to the right in FIG. Then, due to the rightward suppressing force by the tension springs 37a and 37b, the lower outer peripheral edge 35a of the cylindrical portion of the vertical shaft 35 is moved into the conical shape of the two conical portions 33a formed on the horizontal shaft 33. At the same time as being pressed against the inclined side surface,
The lower surfaces of the cylindrical portions 33b at both ends of the horizontal shaft 33 are brought into pressure contact with the upper surface 50a of the movable base plate 50 by the downward suppressing force exerted by the tension springs 37a and 37b. As a result, the entire channel 31 including the CCD unit 1-2o is held in a three-point supported state by the vertical shaft 35 and the movable base plate 50 via the horizontal shaft 33. Further, due to the downward suppressing force by the tension springs 37a and 37b, the spherical tip portion 39a of the adjustment screw 39 screwed onto the square rod 38 is pushed onto the upper surface of the movable base plate 5o.
It is designed to be pressed against 0i. therefore! l!
! By rotating the setting screw 39, the channel 31 is rotated about the horizontal axis 33 around the Y axis, that is, in the α direction, and is positioned.

At this time, the stepped pins 36a and 36b.

Since it is located between the horizontal shaft 33 and the adjusting screw 39 and near the adjusting screw 39, the lower surface of the cylindrical portion 33b on both end sides of the horizontal shaft 33 is in contact with the upper surface 50a of the movable base plate 50. The two are urged to be pressed together more strongly, and the two are brought into close contact with each other without being separated. Further, the biasing force of the stepped pins 36a and 36b is
is set to such an extent that rotation around the vertical axis 35 is not prevented.

Furthermore, a spring hook portion 38g is formed to protrude from the left end portion of the channel 31 in the X-axis direction in FIG. It is being On the other hand, a square bar 51 is screwed and fixed to the side surface of the movable base plate 50, and the other end of the tension spring 40 is hung on a stepped pin 52 provided upright on the square bar 51. ing.

Due to the biasing force of the tension spring 40, the channel 31
The whole can be rotated toward the front about a vertical axis 35. Also, the screw hole 5 provided in the square bar 51
An adjustment screw 53 is screwed into 1a, and a spherical tip portion 53a of this adjustment screw 53 is in contact with the front side wall surface 31e of the channel 31 in the Y-axis direction. Therefore, by rotating the adjustment screw 53, the channel 31
is rotated about the vertical axis 35 around the Z axis, that is, in the γ direction, and positioned.

By the fine adjustment 111 structure having such a structure.

Inclination in the X-axis direction, which is the main scanning direction, that is, rotational fine adjustment in the α direction around the Y-axis, and Z, which is the optical axis direction of the imaging lens 5.
Fine rotation adjustment in the γ direction around the axis is performed accurately. That is, by first rotating the adjusting screw 39, the channel 31 is aligned with the horizontal axis 33 against the tension springs 37a and 37b.
The CCD 2 is rotated around the center, thereby positioning the CCD 2 in the α inclination direction. At this time, since the center of rotation and the adjustment position are spaced apart from each other, fine adjustments can be made without using a complicated VitJ such as a differential screw. Note that this: Incline 3A' due to A set screw 39! 3. sometimes channel 3
The spherical tip portion 53a of the adjustment screw 53 is slid while being in contact with the front side wall surface 31Q of the channel 31 in the Y-axis direction. Since the required accuracy is maintained, the channel 31 is hardly rotated around the vertical axis 35 by the sliding movement, and there is no problem in adjustment. Further, since the horizontal axis 33 is provided at a position sufficiently spaced from the CCD 2, the CCD 2 is hardly displaced in the X-axis direction, which is the main scanning direction, when adjusting the CCD 2 in the α tilt direction.

- By rotating the force adjustment screw 53, the channel 31 is rotated about the vertical axis 35 in the γ direction around the Z axis against the tension spring 40, and positioning is performed, and the exposure shown in FIG. The parallelism of the pixel row of the CCD 2 with respect to the line 13 is adjusted. Even in this case, since the rotation center position and the GTM action position are spaced apart, fine adjustments can be made without using a complicated mechanism such as a differential screw. Note that when adjusting the rotation using this adjustment screw 53, the upper surface 5 of the movable base plate 5o
The spherical tip portion 53a of the adjustment screw 39 is slid while being in contact with the top surface 5a of the movable base plate 50, and the cylindrical portion 33b of the horizontal shaft 33 is slid while being in contact with the top surface 5a of the movable base plate 50. However, since the perpendicularity of the upper surfaces 50i and 50a of the movable base plate 50 to the vertical axis 35 is maintained at the required precision, the channel 31 is rotated around the horizontal axis 33 by the above-mentioned sliding movement. There is almost no problem with adjustment. Furthermore, since the vertical axis 35 is provided at a position sufficiently separated from the CCD 2, the CCD 2 is rarely displaced in the X-axis direction, which is the main scanning direction, when adjusting the CCD 2 in the γ direction around the Z-axis. do not have.

Next, the position V1 adjustment of the CCD 2 in the Y-axis direction, which is the sub-scanning direction, and the X-axis direction, which is the main scanning direction, will be explained.

A square rod 55.57 is attached to the rear wall 50h of the movable base plate 50 in the Y-axis direction.

For these square bars 55.57! I! II screws 56°58 are threaded. The tip portions of the adjustment screws 56, 58 are formed into a spherical shape, and the spherical tip portions are brought into contact with the front wall 80c of the rotating base plate 8o.

On the other hand, the right side wall 50d of the movable base plate 50 in the X-axis direction
Fitting holes 50f are formed through the left side wall 50e and the left side wall 50e, and each of these fitting holes 50f connects to a right boss 81. It is fitted to a support shaft 64 that extends between the left boss 82 and the left boss 82 so as to be active and rotatable. Further, as particularly shown in FIG. 4, L-shaped plates 59 and 60 are screwed to the upper sides of the right side wall 50d and left side wall 50e, respectively. Holes 59a and 60a formed at the tips of these L-shaped plates 59 and 60
One ends of tension springs 61a and 61b are attached to. Further, as shown in FIGS. 3 and 4, a right lever 62 and a left lever 63 are rotatably mounted on the support shaft 64. Fitting holes 62a and 63a are formed in the right lever 62 and left lever 63, and the supporting shaft 64 is fitted into these fitting holes 62a and 63a. The right lever 62 and the left lever 63 are arranged on the outside of the right side wall 50d and left side g5oe of the movable base plate 50, respectively, and are inserted into elongated holes 62e formed in their upper arm parts 62d and 63d.
By engaging the locking screws 68 and 69 in G3e, the rotation of the right lever 62 and the left lever 63 with respect to the support shaft 64 is respectively restrained. Note that the locking screws 68 and 69 are attached to the rotating base plate 8.
They are screwed to the right side wall 80a and the left side wall 80b of 0 so as to penetrate in the X-axis direction.

Further, holes 62c and 63c are formed in the middle arm parts 62b and 63b which extend in a direction perpendicular to the upper arm parts 62d and 63d, that is, toward the front wall 80c of the rotating base plate 80. One ends of the aforementioned tension springs 61a and 61b are hung on 63c.

In the state shown in FIG. 4, the tension spring 61a
And Glb will be in an energized state.

The movable base plate 50 is about to be rotated clockwise by the biasing force of the tension springs 61a and 61b, but the spherical tip portions 56a and 58a of the adjustment screws 56.58 are on the front wall 80C of the rotary base plate 80. It is designed to be stopped by being pressed against it. The tension spring 61a is extended so that its biasing force generates component forces in the tangential direction and the normal direction around the support shaft 64, whereby the movable base plate 50 is urged against the support shaft 64. , will be held in a fixed position.

Further, as shown in FIG. 6, a lower arm portion 62f is formed below the right lever 62, and a bent portion provided on the lower arm portion 62f forms the right side wall 50d of the movable base plate 50.
is in contact with the lower edge of the

When the CCD unit 20 is rotated toward the front to the state shown in FIG. 6 for maintenance or replacement, the tension spring 61a, which is in a predetermined deenergized state, is held so as not to fall off. It has become so. Further, around the fitting holes 62a and 63a formed in the right lever 62 and the left lever 63, arcuate holes 62g+62h, 63g, and G3h are provided so as to face each other, and one of the arcuate holes 62g and 63
An adjustment screw 83 is passed through the hole g in a non-contact manner, and a locking screw 73 is inserted through the other arcuate holes 62h and 63b.

The fine adjustment mechanism having such a configuration allows precise position movement fine adjustment in the Y-axis direction, which is the sub-scanning direction. That is, by rotating the adjustment screws 56 and 58, the movable base plate 50 is rotated about the support shaft 64 against the tension springs 61a and 61b, thereby positioning the CCD 2 in the Y-axis direction. It has become. : When the rotation center position and the adjustment position n are spaced apart from each other compared to the distance between the rotation center position and the CCD 2, fine adjustments can be made without using a complicated mechanism such as a differential screw. To make someone do something...) I can do it. The movement adjustment operation in the sub-water survey direction using the adjustment screws 56 and 58 is performed using the support shaft 64.
This is done by rotating the CCD2 around the center.
is spaced apart from the support shaft 64, and the position! l! Since the amount of movement for 1 m is 1 to 2 IIn, the deviation in the inclination β direction of the CCD 2 in the sub-scanning direction is extremely small and there is no problem. Also, as in this example, the pixel dimensions are quite small (7μm x 7μm).
m) When a linear sensor is used, a slight inclination β of the pixel row in the sub-scanning direction does not pose any problem in reading the projected image. Rather, it is better to slightly tilt the CCD 2 in the sub-scanning direction with respect to the optical axis.
This is preferable because it is possible to avoid reprojection of the reflected image of the stepped image onto the pixel row.

Furthermore, fitting holes 81a and 82a are formed through the center portions of the right boss 81 and the left boss 82, which are screwed to the right side walls 80a and 80b of the rotating base plate 80, respectively. Both end portions of the support shaft 64 are fitted into the holes 81a and 82a, and are locked by set screws 81b and 82b.

Further, a compression spring 65 is fitted to the outside of the support 1Plh64. One end portion of the compression spring 65 is supported by the inner surface of the right drawing wall 50d of the movable base plate 50, and the other end portion of the compression spring 65 is fixed so as to pass through the support shaft 64. The movable base plate 50 is pressed to the pin 67 through a washer 66 and is locked, so that the movable base plate 50 is urged toward the right in FIG. 3, that is, toward the right boss 81. On the other hand, an adjusting screw 83 is screwed into the right boss 81 so as to pass through it by 1τ, and a spherical tip portion 83a of the adjusting screw 83 is in contact with the right side wall 50d of the movable base plate 50. Due to the movement force of the movable base plate 50 due to the compression spring 65, the right side wall 50 of the movable base plate 50
d is adapted to be pressed against the spherical tip portion 83a of the adjustment screw 83. Therefore, by rotating the adjustment screw 83, the movable base plate 5o is moved in the main scanning direction. The thread pitch of the adjustment screw 83 is 0.5
It is set to on, and the position of pixel row 2a of CCD 2!
To satisfy lH% accuracy of 63.5μm, adjust screw 8
3 with an accuracy of approximately 45°.
Adjustment operations can be performed very easily.

In the adjustment operation of the CCD 2 in the main scanning direction (X-axis direction) using the adjustment screw 83, the position of the CCD 2 is adjusted in the sub-scanning direction (Y-axis direction), the main scanning tilt direction (α direction), and the direction around the optical axis (γ direction). Alternatively, no deviation occurs in each of the Z-axis directions. This consists of the support shaft 64 and the imaging lens 5.
The groove is formed so that the perpendicularity to the optical axis of the image can be adjusted to an accuracy of ±1', and the parallelism of the support shaft 64 to the exposure line 13 of the original image is also maintained within an accuracy of ±1'. and that the movable base plate 50 is bent by the tension springs 61a and 61b.
The support shaft 64 is pressed in the radial direction by the urging force of !, and at the same time! I! 1ffi screw 5G.

This is because the position of the movable base plate 50 is maintained by the front wall 80c of the rotary base plate 80 via the movable base plate 58.

Further, as in this embodiment, the dimensions of the pixel row 2a of the CCD 2 (
35aa), the support shaft 64 is spaced sufficiently (180mm
), the positional accuracy of the right boss 81 and left boss 82 supporting the support @64 in the sub-scanning direction (Y-axis direction) is within the normal processing accuracy (for example, ±0.1 m).
m), the positional deviation in the sub-scanning direction (Y-axis direction) is about 2 μm for a position adjustment amount of 2 fields in the main-scanning direction X of the CCD 2, and there is no problem in adjustment.

Next, a method for adjusting the perpendicularity of the optical axis of the imaging lens 5 with respect to the original exposure surface shown in FIG. 1, that is, the plane for reading the original 12 with the exposure line 13 will be explained.

As shown in FIG. 3, FIG. 4, and FIG. A hole 96 is formed perpendicular to the axis, and this hole 96
A conical shaft 94 is fitted into the front wall 80c, and the conical shaft 94 is tightened by a cylindrical female screw 95 and fixed at right angles to the front wall 80c. Further, the rotating base plate 80 is arranged so as to face the front wall 100a of the base plate 100, which is formed in a U-shape in cross section. The large-diameter side of the conical shaft 94 passes through the circular arc hole portion 120a of the mating hole 120 (see FIG. 5(b)) and projects inside the base plate 100. At this time, the engagement hole 1
20 circular arc hole portions 120a are formed to be smaller than the maximum diameter of the conical portion of the conical shaft 94 and larger than the minimum diameter, and the conical inclined surface 94a of the conical shaft 94 is formed in the engagement hole 1.
20 is engaged with the circular arc hole portion 120a. As a result, the rotating base plate 80 is moved relative to the front wall 10°a of the base plate 100.
is designed to be rotatable around a conical shaft 94.

On the other hand, a pedestal 101 is welded to the right side portion in FIG. 3 of the front surface u 100 a of the pedestal F2100.

An adjustment screw 102 is screwed into a screw hole formed in this pedestal 101 so as to penetrate therethrough.

The spherical tip portion 102a of the adjusting screw 102 is in contact with the upper surface 90a of the square rod 9o that is welded to the right side wall 80a of the rotating table plate 80. Further, a stepped pin 9 is provided on the left side portion of the front wall 100a of the base plate 100 in FIG.
3 are erected, and stepped pins 91 are erected on the left side wall 80b of the rotating base plate 8o, and tension springs 92 are installed between the stepped pins 93 and the stepped pins 91. is spread across the board. As a result, the base plate 10
The rotating base plate 80 is connected to the conical shaft 94 with respect to the front wall 100a of
The third member is rotated counterclockwise around , and
The corner (
The upper surface 90a of the support 90 is the spherical tip portion 1 of the adjustment screw 102.
02a, and the rotating plywood 80 is restrained.

At this time, the conical shaft 94 is pressed downward perpendicularly to the conical shaft 94, but as described above, the conical inclined surface 94a of the conical shaft 94 By engaging with the conical shaft 94, the conical shaft 94 receives a component force directed to the left in FIG. 5, and this component force presses the rotating base plate 80 toward the base plate 100. Also, the base plate 1
On the front wall 100a of 00, three circular pedestals 100f are formed at equal intervals of approximately 120° on the circumference centered on the conical axis 94, and these circular pedestals 100
The outer surface of the front wall 80C of the rotating base plate 80 is brought into contact with the upper surface f, and the rotating base plate 80 is supported at three points, thereby allowing the rotating base plate 80 to rotate stably. There is. Further, on the front surface Q 80 c of the rotating base plate 80, three long holes 84, 85, 86 are formed at equal intervals of approximately 12° on the circumference around the conical shaft 94. long hole 8
Set screws 8G, 87°88 passing through holes 4, 85, and 86 are screwed onto the front wall 100a of the base plate 100 to fix the rotating base plate.

Therefore, if the adjusting screw 102 is rotated with the set screws 86, 87, and 88 loosened, the rotary base plate 80 will be rotated about the one conical axis 94, and the perpendicularity of the optical axis of the imaging lens 5 will be will be adjusted.

In adjusting the plane angle yA of the optical axis using the adjustment screw 102, the position of the CCD 2 is adjusted in the main scanning direction (X-axis direction), the sub-scanning direction (Y-axis direction), the main scanning tilt direction (α direction), and around the optical axis. There is no deviation in either the direction (γ direction) or the Z-axis direction. Moreover, the three-point support structure of the rotating base plate 8o prevents the rotating base plate 80 from deforming.

In the perpendicularity adjustment mechanism in the sub-scanning direction between the optical axis of the imaging lens 5 and the original image exposure surface, as shown in FIGS. 14, 15 and 16, the base plate 100
is the base 200. Although it is screwed to the front side wall 200a of
Three circular pedestals 203 are welded to the front wall 200a, and a left main shaft 215 and a right main shaft 217 are coaxially attached to a left side plate 213 and a right side plate 216, which are respectively welded to the left and right end portions in FIG. It is installed so that it is placed in the Two shafts 214 are provided at positions symmetrical to the left main shaft 215 on the left side plate 213 so that they are parallel to the left main shaft 215 and their axes are arranged on the same plane. Also, y′X draft exposure exposure line 1
3. The left support frame 230 is provided as an immovable member.
The base 200 is attached to the left main shaft 2 on the right support frame 231.
15 and a left support plate 218 and a right support plate 225 rotatably supported around the right main shaft 217 are welded, respectively.

A four part 218a is formed in the center part of the left support plate 218, and a bottom part 21 of the four part 218a is formed.
A bearing portion 218b having an arcuate cross section is recessed in the center portion of 8f. The left main shaft 21 is attached to this bearing portion 218b.
5 is fitted.

Further, the left main shaft 21 is located at the bottom surface 218f of the recess 218a.
A square bar 219 for positioning 5 is fixed by two setscrews 220. - Groove 21 on the right and left upper shafts 215
5a is formed in an annular shape, and when the square rod 219 comes into contact with the groove bottom 215b of this annular groove 215a, the left main shaft 215 is fixedly positioned in the left and right main axis direction, that is, the main scanning direction (X-axis direction). It is becoming regulated.

Also, a set screw 22 is screwed onto the square rod 219.
1 is pressed against the groove bottom 215b of the groove 215a.

Further, in the upper and lower end portions of the left support plate 218, recesses 1318c and 218d are provided to accommodate the shaft 214 in a loosely fitted state, and adjustment screws 222 and 223 are inserted to press the shaft 214. They are screwed onto the upper and lower end portions of the left support plate 218, respectively. By rotating the adjustment screws 222 and 223, the left support plate 218 is rotated about both main shafts.

Further, a bearing portion 225a having an arcuate cross section is recessed in the center portion of the right support plate 225.
A right main shaft 217 is fitted into the main shaft 217 . Also, the right support plate 22
5 has a square rod 22 for positioning the right main shaft 217.
6 is fixed by two set screws 226 , and the tip of the set screw 228 screwed onto the square bar 226 is pressed against the surface of the right main shaft 217 .

In FIG. 1S, the optical axis of the imaging lens 5 is the axis 214.
The imaging lens 5 is set parallel to the straight line connecting the axis of the left main axis 215 and the left main axis 215, and extends in the sub-scanning direction through the left main axis 215 and the right main axis 217.
The optical center of the imaging lens 5 is arranged, and the optical axis position of the imaging lens 5 is arranged near the left and right axes. In such a configuration, if the adjusting screws 222 and 223 are rotated, the optical axis of the imaging lens 5 is rotated integrally with the base 200, and the inclination in the sub-scanning direction (Y-axis direction) is adjusted. It will be fine-tuned. As a result, the perpendicularity between the optical axis of the imaging lens 5 and the exposure surface of the document in the sub-scanning direction can be finely adjusted. In such an adjustment operation, the imaging lens 5 does not shift in the main scanning direction (X @ force direction or the inclination direction (α direction) of the main scanning direction). After adjusting the inclination in the scanning direction, the upper screw 221.2
28 and adjusting screws 222, 223
is fixed in position, and therefore the position of the imaging lens 5 is fixed.

Next, the lens unit 300 and the CCD unit 20
The mechanism for adjusting the movement of the lens in the optical axis direction will be described below.

Next, the lens unit 300 and the CCD unit 2o
The mechanism for adjusting the movement of the lens in the optical axis direction will be described below.

In FIGS. 1, 2, 3, 4, and 14, the left support frame 230 and the right support frame 230 are provided as immovable members with respect to the exposure line 13 of the original image, as described above. With respect to the frame 231, the base 200 is aligned with the exposure line 1.
A left main shaft 215 and a right main shaft 2 which are parallel to and coaxial with 3.
This base 20 is rotatably supported by a base 17.
Hχ meeting holes 01 and 202 are formed in the upper wall 200b and lower wall 200c of 0, respectively, so as to face each other. These fitting holes 201 and 202 have an upper left shaft 23.
1 and the right main shaft 217 at right angles to both axes.
13 is inserted. On the other hand, the upper wall 1 of the base plate 100
00b and the lower wall 100c have the above-mentioned fitting holes 201.
, 202 are formed with elongated holes 111, 112 extending in the sub-scanning direction, and both upper and lower ends of the support shaft 113 are fitted into these elongated holes 111, 112. Also, the upper plate 100 of the support shaft 113
upper side wall 100b and lower side a1o.

Retaining rings 114 are respectively locked on the upper and lower sides of C, thereby securing the support shaft 11 together with the base plate 100.
3 is supported so as to be slidable in the optical axis direction of the imaging lens 5. At this time, the base plate 100 is moved in the sub-scanning direction (Y
It is movable in the main scanning direction (X-axis direction) and remains stationary in the main scanning direction (X-axis direction).

Furthermore, among the three circular pedestals 203 previously written on the front wall 200a of the base 200, two of the circular pedestals 203 are placed apart from each other by a predetermined distance on a line parallel to the axis of the support shaft 113. and the remaining one circular pedestal 20
3 is arranged on a line parallel to the axes of the left main shaft 215 and the upper right shaft 217. The surface portions of these three circular pedestals 203 are formed so as to be arranged in the same plane, and are each formed with a female thread portion 203b into which a screw 104, which will be described later, is screwed. On the other hand, in the front wall 100a of the base plate 100, there are three vertically long elongated holes 103 at positions corresponding to the three circular pedestals 203.
The screws 104 pass through each of these elongated holes 103. A compression spring 106 is attached to the outside of the screw 104, and this compression spring 106
A tube 105 is attached to the outside of the tube. compression spring 106
One end portion of the compression spring 106 is pressed against the screw head of the screw 104 through a washer 107, and the other end portion of the compression spring 106 is pressed against the base plate 100 through a washer 108. As a result, the base plate 100 is pressed toward the circular base 203, and the base plate 100 is moved along the support shaft 113 while being pressed against the circular base 203 by the urging force of the compression springs 106 at three locations. It is made slidable in the direction of the lens optical axis. At this time, the base plate 100 remains stationary in the sub-scanning direction.

Further, a square rod 109 is screwed to the right end of the upper wall 100b of the base plate 100 near the support shaft 113, and an adjustment screw 110 is screwed to pass through the square rod 109. Above yJ! 1! ! The spherical tip portion 110a of the screw 110 passes through a large diameter hole (not shown) formed in the base plate 10 and connects to the upper wall 20 of the base 200.
It is in contact with 0b.

In this embodiment, one base plate 100, a rotary base plate 80 attached thereto, and further a lens unit 300, a CCD unit 20, and a CCD unit 20 attached to the rotary base plate 80 are used.
Due to the weight of the CD base plate unit 30° support shaft 64, etc.
The force that presses and slides the base plate 100 downward along the support shaft 113 becomes greater than the frictional resistance force between the front wall 100a of the base plate 100 and the front surface 203a of the circular pedestal 203 due to the compression of the three compression springs 106. Therefore, no spring is used to press and bias the base plate 100 downward. However, if necessary, for example, the lower wall 1 of the base plate 100
A compression spring may be inserted between the supporting shaft 113 and the lower side W 200 c of the base 200.

In such a configuration, by rotating the adjustment screw 110, the base plate 100 is finely adjusted and moved along the support shaft 113 while in contact with the circular base 203. Therefore, by moving the adjusting screw 110 back and forth, the lens unit 300 and CCD unit 20 can be moved slightly in the direction of the lens optical axis without causing mutual positional deviation.
It will be moved by A. This allows fine adjustment of the distance between the exposure line 13 and the CCD 2, that is, the conjugate length (L in FIG. 2) at a predetermined projection magnification, to be easily and accurately performed. Moreover, during such adjustment, the imaging lens 5 and CCD 2 are adjusted in the main scanning direction (X-axis direction), sub-scanning direction (Y-axis direction), rotation direction around the lens optical axis (γ direction), and main scanning direction (X-axis direction), sub-scanning direction (Y-axis direction), Tilt direction of scanning direction (
There is no deviation in the direction of inclination (β direction) in the sub-scanning direction or the α direction.

Next, the light shielding and dustproof seal structure of the CCD 2 will be explained.

3 and 5, a seal body 31 is attached to the lower part 301d of the lens holder 301 of the lens unit 300.
0 is fitted with an upper plate 311 that is adhesively fixed.

The upper plate 311 is formed with a bent portion 311a for positioning in the main scanning direction and the sub-scanning direction. On the other hand, the lower side of the seal body 310 is bonded to a lower plate 312, and this lower plate 312 has notches 312a that engage with two countersunk screw pins 32 for screwing the CCD unit 1-20 into the channel 31. is formed. The above seal body 3
10 is mounted and positioned so as to shield the peripheral area outside the imaging optical path of the imaging lens 5 between the lens holder 301 and the metal plate 21 that adhesively holds the CCD 2.

The seal body 310 is made of a soft foamed resin having fine mesh and light-shielding properties and air permeability formed into a rectangular tube shape, and its elastic force allows the lens holder 301 and the metal plate 2 to be attached to each other.
1 through an upper plate 311 and a lower plate 312.

No gaps are formed between the upper plate 311 and the lens holder 301 and between the lower plate 312 and the metal plate 21. With such a seal body 310, the CCD 2
External light that would degrade the image reading signal of the C0D2 is blocked, and the adhesion of dirt, dust, etc. to the C0D2 is prevented.

Further, the sealing body 310 is made of a material and having a shape and dimensions that do not impair air permeability, so that the image reading function of the CCD 2 is sufficiently prevented from being inhibited or degraded. Furthermore, the hardness and size of the sealing body 310 prevent the lens holder 301 or the metal plate 21 from being deformed or misaligned with each other due to the elastic force of the sealing body 310.

In addition, the lens holder 301 and the scrap metal plate 21 are set to such an extent that they can be removed from between. Therefore, the upper plate 31
1 and a lower plate 312 are bonded vertically to each other.
10 can be easily attached and detached between the lens holder 301 and the scrap metal plate 21, and is reliably positioned by positioning means formed on the upper plate 311 and the lower plate 312. 301
When adjusting the position of the metal plate 21 relative to the lens holder 301, the mounting position does not shift, and the flexibility of the seal body 301 prevents excessive force from being applied to the lens holder 301 and the metal plate 21.

In the cooling system shown in FIG. 5(a), the air that is forced to be blown by a blower 206 is filtered by a dust filter 208 attached to a duct 207, and then filtered to the base. flowed into the stand 200,
From the square hole 205 of the base 200 to the square hole 100g of the base plate 100
The liquid passes through the square hole 80e of the rotary base plate 80 and is sprayed toward the seal body 310, the lower part of the CCD 2, and the PCB-122. The blowing action of the blower 206 is controlled based on a temperature detection signal of the CCD 2 emitted from a thermistor 25 that is in contact with and adhered to the back surface of the CCD 2 .

With such a cooling device of the COD unit 2o, C
This prevents expansion and deformation of the CCD 2 due to heat generation from the CD 2 itself or the PCB-122 soldered to the CCD 2.

This prevents image reading abnormalities from occurring and also prevents PCE
Malfunctions due to heat generated by the electronic components on the -122 are also prevented.

Although the CCD 2 installed in the document reading device is designed to prevent dust such as dust from adhering to the surface of the cover glass 2b, it may interfere with normal reading during long-term use. Since dirt and dust may adhere to the surface, it is desirable to clean it as necessary. Furthermore, it is desirable that the CCD 2 be constructed so that it can be easily replaced if it breaks down or its performance deteriorates for some reason.

Therefore, in this embodiment, the mounting member of the CCD 2 is rotatable in the sub-scanning direction, and a CCD unit 20 is formed in which the CCD 2 is integrally formed with a metal plate 21 which is a holding member thereof. A configuration is adopted in which it is retracted to the outside, which facilitates attachment and detachment to the member. In addition, when simply cleaning the CCD 2 without replacing it, the CCD unit 20 is configured to expose the CCD unit 20 at an angle to the front, thereby making the cleaning operation extremely easy. Furthermore, even when cleaning the CCD unit 20 or replacing the CCD unit 20, the position of the mounting member for the CCD 2 is configured to be accurately returned to its original position by the biasing force of an adjustment screw and a spring, and the dimensions of the CCD unit 20 are The structure is such that fine A adjustment due to the above variations can be made extremely easily.

That is, as shown in FIGS. 3, 4, and 6, the tip of the screw 68 screwed into the right side wall 80a of the rotating base plate 80 is connected to the upper arm 62d of the right lever 62. Although the right lever 62 is retracted to a position where it is difficult to escape from the elongated hole 62e, the right lever 62 is rotated around the support shaft 64 in the direction shown in Figure 6 by the biasing force of the tension spring 61a. A bent portion of the lower arm portion 62f of the lever 62 is brought into contact with the lower edge of the right side wall 50d of the movable base plate 50.

As a result, the movable base plate 50 and the support shaft 6 of the right lever 62
The relative position around 4 is made stable. Similarly, when the screw 69 screwed into the left side wall 80b is removed from the elongated hole 63e of the upper arm 63d of the left lever 63, the bent portion of the lower arm 63f of the left lever 63 is attached to the movable base plate 50.
The movable base plate 50 and the left lever 63 are brought into a stable relative position around the support shaft 64.

In this state, as shown in FIG.
The movable base plate 50 with the D unit 20 attached is attached to the right lever 6
2. It can be rotated integrally with the left lever 63 to the outside of the projection optical path of the imaging lens 5, but its rotation range is limited to the screws 73 and 74 screwed into the right boss 81 and left boss 82, respectively. In contrast, the arc hole 62 of the right lever 62
h and one end of the arcuate hole 63h of the left lever 63 are brought into contact with each other. In this state, the CCD unit 20 is exposed at the front of the apparatus, and cleaning of the CCD 2, replacement, and attachment/detachment of the CCD unit 20 are extremely easy. Also, in this state, the arcuate hole 62g of the right lever 62 does not come into contact with the adjustment screw 83 that cooperates with the compression spring 65 to position the movable base plate 50 on which the CCD unit 20 is mounted in the main scanning direction. The position and size of the arcuate hole 62g are set in such a manner that no excessive force is applied to the adjustment screw 83, causing its position to shift or deform. . At this time, the movable base plate 50
The holding member (channel 31 in FIG. 3) of the CD unit 20 is held in a completely unchanging state with respect to the movable base plate 50.

After completing the necessary work such as cleaning and replacing the CCD 2 and CCD unit 20, the movable base plate 50 is rotated back to its original position. That is, if the right lever 62 and the left lever 63 are locked in predetermined positions by screws 68 and 69, respectively, the tension springs 61a and 6
The movable base plate 50 is rotated around the support shaft 64 by the urging force of 1b, and at this time: the tips of the A setting screws 56 and 58 are brought into contact with the front wall 80c of the rotary base plate 80. The movable base plate 50 is returned to its original position in a state where it is accurately positioned. Also at this time, the movable base plate 5
The right side Q50d+J adjustment screw 83 of o is brought into contact with the original position, and the position in the main scanning direction is also accurately returned to the original position.

In the image reading device according to the embodiment of the present invention, a position adjustment mechanism that uses the steps of a screw is employed to adjust the position of the CCD with respect to the imaging lens, and the position of the imaging lens 5 and C0D2 with respect to the original image exposure surface. There is. That is, in this embodiment, a means for pressing the male thread and the female thread in the radial direction is used in order to prevent a slight ia failure due to play in the axial and radial directions of the screw.

As shown in FIGS. 17 and 18, the square bar 3
8 and the movable base plate 50 are urged toward each other by a tension spring or gravity, and an adjustment screw 39 is screwed into a female thread 38a formed in the square bar 38. The hemispherical tip portion 39a of this adjustment screw 39 is in contact with the upper surface 50i of the movable base plate 50.

The mutual positions of the square rod 38 and the movable base plate 50 are determined by the cooperation of tension springs or gravity. Also, a female thread 38 formed on the square bar 38
A female thread 73 is formed in a direction perpendicular to the screw axis of a, and has a diameter equal to or slightly smaller than the root diameter of this female screw 73, and a length approximately equal to the root diameter of the female screw 73. A cylindrical brake element 71 made of nylon is fitted into the female thread 73. A set screw 72 is screwed into the female thread 73 from behind the brake 71, and a planar tip 72a of the set screw 72 presses the brake 71.

The planar tip 72a of the set screw 72 is connected to the brake member 71.
When the set screw 72 is screwed in more strongly from the state in which it is in contact with the nylon brake 71, the distal end portion of the nylon split brake 71 is pressed against the adjustment screw 39 while undergoing compressive deformation, and the distal end portion 71a of the brake 71 is pressed against the adjustment screw 39. 39, and the peripheral surface 71b of this brake 71 in contact with the female thread 73 also undergoes plastic deformation so as to bite into the threads and valleys of the female thread 73. . In this state, the male thread of the adjusting screw 39 presses the female thread 38a in the radial direction, and the axial center of the adjusting screw 39 is maintained slightly deviated from the axial center of the female thread 38a, and the adjusting screw 3o itself rotates. The shaft center position can be rotated without shifting. Therefore, the tip 39a of the adjustment screw 39 is
It is not moved in the radial direction of the screw. Rotate the adjustment screw 39 having a male thread that engages with the female thread 38a.jJ
), the relative position of the square bar 38 and the movable base plate 50 is adjusted by the step of the 7A adjustment screw 39, but at this time, the movable base plate is The contact position of the tip end 39a of the adjusting screw 39 with respect to the upper surface 50i of the plate 50 is designed to remain in place.

Furthermore, when the nylon brake 71 is plastically deformed as described above, elastic stress is generated in itself, so the brake 71
1 and the setscrew 72 are prevented from unintentionally loosening. Further, the braking force applied to the adjusting screw 39 by the pressing force of the brake element 71 does not change regardless of whether the adjusting screw advances or retreats, and can be further adjusted as necessary.

In such a configuration, after the relative position between the movable base plate 50 and the square bar 38 is adjusted by moving the adjusting screw 39 back and forth, the set screw 72 is further screwed in, thereby further suppressing and deforming the brake element 71. Adjustment screw 39 is female thread 38
It is immovably locked with respect to a. In this case, the adjustment screw 39 will not be displaced from the female thread 38a by screwing in the set screw 72. Therefore, no other fastening means is required for locking the adjustment screw 39 to the female thread 38a.

If the adjusting screw 39 has been rotated for some reason and it becomes necessary to readjust the mutual positions of the movable base plate 50 and the square bar 38, loosen the set screw 72 slightly and adjust the position of the brake 71 relative to the adjusting screw 39. Reduce the pressing force. By doing this, the adjustment screw 39 can be rotated with its axial center position maintained at a predetermined position by the required pressing force, and there is no damage to the threaded portion of the adjustment screw 39. Also, no indentation is caused, and therefore the smooth rotation of the adjusting screw 39 is not hindered in any way.

Such an adjustment screw 39. Square bar 38, upper surface 501 of movable base plate 50. The position adjustment device constituted by the brake 71 and the set screw 72 is similarly employed in other position adjustment devices, that is, position adjustment devices using adjustment screws 53, 56, 58°, 102, 110, 83.

[Effects of the Invention] As described above, according to the present invention, the COD is positioned extremely accurately in the main scanning direction, the sub-scanning direction, and the optical axis direction with respect to the reference position of the metal plate, and the CCD is glued and attached. By stopping the COD, it is possible to hold the COD without causing deformation or distortion, and even when replacing the COD, the metal plate prevents deformation or distortion.Furthermore, the cooling effect of the metal plate makes it possible to hold the COD without causing deformation or distortion. It is also possible to prevent the temperature of COD from rising.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing the main parts of the optical system of an apparatus in an embodiment of the present invention, and Fig. 2 shows a set of imaging lenses and C
FIG. 3 is an explanatory front view showing a set of CCD reading units, and FIGS. 4 and 5 (a) show the CCD shown in FIG. 1. 5(b) is a front explanatory view showing the shape of the hole provided in the base plate; FIG. is C
FIG. 7 is a plan view showing the positioning and fixing structure of the CCD, and FIG. 8 is a cross-sectional view taken along line A-A' in FIG. 7. 9 is an explanatory plan view showing another embodiment of the COD positioning and fixing structure, FIG. 10 is an explanatory cross-sectional view taken along the line 13-B' in FIG. 9, and FIG.
Fig. 12 is an exploded perspective view showing the fine adjustment structure of the CCD, and Fig. 13 shows the focal point of the imaging lens and the gm installation. FIG. 14 is a front view showing the reading unit shown in FIG. 3 removed from the base; FIG. 15 is a longitudinal cross-sectional view showing the structure; FIG. 16 is a cross-sectional explanatory diagram along line BB' in FIG. 14.
17 and 18 are cross-sectional explanatory views taken along the line, and are cross-sectional explanatory views showing the locking structure of the adjustment screw. 1.2.3...CCD, 4,5.6...Imaging lens, 12...Original, 13...Exposure line, 15...
Reading unit, 2o... CCD unit, 21...
Metal plate, 21a...main scanning direction! ! i semi-green, 21b・
- Sub-scanning direction reference garlic, 21g...positioning hole. (Other names) Shape q Figure ``-β U40Kuni17 Figure δLoaP) 740 ? U7σ Figure 40KuJe mouth

Claims (1)

[Claims] 1. A document image is projected onto a photoelectric conversion element by an imaging lens, and the document image is read photoelectrically by relatively moving the document image and the photoelectric conversion element in a sub-scanning direction. In the position adjustment mechanism of the image reading device, the photoelectric conversion element is loosely fitted into the opening of the metal plate, and the photoelectric conversion element is fitted into the opening of the metal plate at reference positions in the main scanning direction and the sub-scanning direction. A positioning portion for the photoelectric conversion element that comes into contact with the conversion element is provided, and a portion between the periphery of the photoelectric conversion element and the opening of the metal plate is filled with a resin agent that adhesively holds the photoelectric conversion element. Characteristic position adjustment mechanism of image reading device. 2. The position of an image reading device that projects an original image onto a photoelectric conversion element using an imaging lens and moves the original image and the photoelectric conversion element relative to each other in the sub-scanning direction to photoelectrically read the original image. In the adjustment mechanism, the photoelectric conversion element is loosely fitted into the opening of the metal plate, and the opening of the metal plate has reference positions in the main scanning direction, the sub-scanning direction, and the optical axis direction of the imaging lens. A positioning portion for the photoelectric conversion element that comes into contact with the photoelectric conversion element is provided in the photoelectric conversion element, and a portion between the periphery of the photoelectric conversion element and the opening of the metal plate is filled with a resin that adhesively holds the photoelectric conversion element. A position adjustment mechanism for an image reading device, characterized by: