JPH06237335A - Adjustment mechanism for position of image sensor in original reader - Google Patents

Abstract

PURPOSE:To obtain the image sensor position adjustment device in which the position of an image sensor is unchanged at position adjustment of an adjustment mount plate with the image sensor mounted thereto and at its fixing state, the effect of a deflection by a tightening force is not much given onto the image sensor when the base of the adjustment mount plate with the image sensor mounted thereon is fixed to the equipment base by a fixing means and the turning of other adjustment cam is regulated when the one adjustment cam of the two adjustment cams used to adjust the fixing position of the adjustment mount plate with the image sensor mounted thereon is turned. CONSTITUTION:A base of an adjustment mount plate 74 with an image sensor 27 mounted thereon is provided with a part extended to both left and right sides with respect to an image sensor mount section. Furthermore, a fixed part of the adjustment mount plate formed to the base of the adjustment mount plate with the image sensor mounted thereon is provided on an extension line of a light receiving face of the image sensor. Moreover, a regulation means regulating individually two adjustment cams 77, 78 used to adjust the fixing position of the adjustment mount plate with the image sensor mounted thereon is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens position adjusting mechanism in a document reading device used in digital copying machines, facsimiles, scanners and the like.

[0002]

2. Description of the Related Art Conventionally, a document reading apparatus used in a digital copying machine, a facsimile or the like illuminates a document by relatively moving the document and a light source, and reflects light from the document on an image sensor by a lens. I am reading the original image.

An example of such a document reading device will be described with reference to FIG.

An optical system 2 for scanning and illuminating a document G placed on a document placing plate 11 which is a transparent plate is arranged in a main body 1 of the document reading device. The optical system 2 includes an illumination lamp 21 as a light source, a reflector 22, mirrors 23 and 24,
25, a lens 26, and an image sensor 27. The image sensor 27 is, for example, CC
A D type image sensor, a MOS type image sensor or the like is used. Then, the illumination lamp 21, the reflector 22 and the mirror 23 are integrally moved at a predetermined speed in the direction of the arrow A, and the mirrors 24 and 25 are integrally moved to the illumination lamp 21.
The original G placed on the original placing plate 11 is illuminated by moving the original G in the same direction at a speed half the moving speed, and the reflected light from the original G is reflected by the mirrors 23, 24, 25 ,. The light is guided to the image sensor 27 (shown by the optical path C in FIG. 7) through the lens 26.

In such a document reading device, in order for the image sensor 27 to correctly read the document, it is necessary that the image forming position of the lens 26 and the light receiving area of the image sensor 27 are exactly coincident with each other. Therefore, conventionally, the position of the image sensor and the position of the lens are adjusted while checking the original image received by the image sensor.

A conventionally used image sensor position adjusting mechanism is formed by a base 41 placed on the apparatus base 10 and a substantially vertical standing from the base 41 as shown in FIGS. 5 and 6. The adjustment mounting plate 40 including the mounting portion 42 for mounting the image sensor 27 via the height adjusting plate 43 is
It is configured to be movable, and after adjusting the position of the adjusting mounting plate 40 by the adjusting means, the base portion 41 of the adjusting mounting plate 40 is fixed to the base 10 by fixing means such as screws. The adjusting means may be, for example, JP-A-3-2.
Adjustment cams such as those shown in the 20858 publication are commonly used.

[0007]

Since the base portion 41 of the adjustment mounting plate 40 is formed so as to extend only on one side of the upright mounting portion 42, the base portion 41 of the adjustment mounting plate 40 shown in FIG. As shown in FIG. 5, when the base portion 41 is moved and adjusted between the holding plate 44 attached to the base plate 10, there is a slight gap between the holding plate 44 and the base portion 41. Therefore, as shown in FIG. The image sensor 27 side is tilted downward. After adjusting in this state, screw 45 as shown in FIG.
When fixed by, the inclination is corrected, and the positional relationship between the image sensor 27 and the time of adjustment is not changed, and readjustment is required.

Further, the fixing position of the base portion 41 by the screw 45 for fixing the adjustment mounting plate 40 is determined by the image sensor 27.
Since the configuration is far away from the extension line of the light receiving surface S of, the influence of the bending of the base portion 41 due to the tightening force of the screw 45 has a great effect on the image sensor 27, and the positional relationship with the adjustment time may not change. , Readjustment is required.

Further, since the adjusting cam, which is the position adjusting means of the adjusting mounting plate 40, is not provided with means for restricting the rotation thereof, the focus left / right difference adjustment and the image sensor 27 are performed.
In a device provided with two adjustment cams for adjusting the width direction of the above, when one of the adjustment cams is rotated, the other adjustment cam may also be rotated, which requires readjustment.

The present invention has been made in view of the above points, and the first technical problem is that the position of the image sensor changes when the position of the adjustment mounting plate on which the image sensor is mounted is adjusted and when it is fixed. An object of the present invention is to provide an image sensor position adjusting mechanism in a document reading device that does not do so.

A second technical problem of the present invention is that when the base portion of the adjustment mounting plate on which the image sensor is mounted is fixed to the apparatus base by a fixing means such as a screw, the influence of the bending due to the tightening force is influenced by the image sensor. An object of the present invention is to provide an image sensor position adjusting mechanism in a document reading device that does not significantly affect the image reading position.

A third technical object of the present invention is to adjust one of a focus left / right adjustment cam for adjusting the fixed position of the adjustment mounting plate on which the image sensor is mounted and an adjustment cam in the width direction of the image sensor. It is an object of the present invention to provide an image sensor position adjusting mechanism in a document reading apparatus that regulates the other rotation when rotated.

[0013]

In order to achieve the above-mentioned first technical object, according to the present invention, an original is illuminated and scanned,
A document reading device in which reflected light from the document is guided to an image sensor by a lens, the base being adjusted and fixed on a device base, and the image sensor formed standing upright substantially vertically from the base. Image sensor position in a document reading device having an adjustment mounting plate having a mounting portion to be mounted, adjusting means for adjusting the fixing position of the adjustment mounting plate, and fixing means for fixing the adjustment mounting plate to the base. In the adjusting mechanism, there is provided an image sensor position adjusting mechanism in a document reading apparatus, wherein the bases of the adjusting mounting plates are formed on both sides of the mounting portion.

In order to achieve the above second technical problem,
According to the present invention, there is provided a document reading device in which a document is illuminated and scanned, and reflected light from the document is guided to an image sensor by a lens, the base being adjusted and fixed on the device base, and the base being substantially fixed from the base. An adjustment mounting plate having a mounting portion for vertically mounting the image sensor, adjusting means for adjusting a fixing position of the adjustment mounting plate, and fixing for fixing the adjustment mounting plate to the base. In the image sensor position adjusting mechanism in the original reading device including the means, the adjusting mounting plate has a fixing portion provided by the fixing means on an extension line of a light receiving surface of the image sensor. An image sensor position adjusting mechanism in is provided.

In order to achieve the above-mentioned third technical problem,
According to the present invention, there is provided a document reading device in which a document is illuminated and scanned, and reflected light from the document is guided to an image sensor by a lens, the base being adjusted and fixed on the device base, and the base being substantially fixed from the base. An adjustment mounting plate having a mounting portion for vertically mounting the image sensor, adjusting means for adjusting a fixing position of the adjustment mounting plate, and fixing for fixing the adjustment mounting plate to the base. In the image sensor position adjusting mechanism in the document reading apparatus having the means, the adjusting means fits the eccentric cam shaft that fits in the elongated hole formed in the adjustment mounting plate and the hole formed in the base. Two adjusting cams each having a rotating shaft, an eccentric cam shaft, and an operating portion that rotates the rotating shaft, and a restricting unit that restricts each rotating of the adjusting cam. In the characteristic document reading device Mejisensa position adjusting mechanism is provided.

[0016]

In the image sensor position adjusting mechanism according to the present invention, since the base of the adjustment mounting plate is formed on both sides of the mounting portion on which the image sensor is mounted, the image is adjusted when the position of the adjustment mounting plate is adjusted and when it is fixed. The position of the sensor does not change.

Further, in the image sensor position adjusting mechanism according to the present invention, since the fixing portion of the adjusting mounting plate on which the image sensor is mounted is provided on the extension line of the light receiving surface of the image sensor, the fixing means is tightened. The influence of bending due to the force does not significantly affect the image sensor.

Further, the image sensor position adjusting mechanism according to the present invention is provided with the restricting means for restricting the rotation of the two adjusting cams for adjusting the fixed position of the adjusting mounting plate on which the image sensor is mounted. When the adjusting cam is rotated, the other adjusting cam is prevented from rotating.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description will be given below with reference to the accompanying drawings showing a preferred embodiment of an image sensor position adjusting mechanism in a document reading apparatus constructed according to the present invention.

FIG. 1 is a plan view showing an embodiment of an image sensor position adjusting mechanism according to the present invention, and FIG. 2 is A in FIG.
FIG. 3 is a perspective view of the image sensor position adjusting mechanism according to the present invention, and FIG. 4 is an exploded perspective view of the image sensor position adjusting mechanism according to the present invention. In the figure, 6 is a lens position adjusting mechanism, and 7 is an image sensor position adjusting mechanism arranged behind the lens position adjusting mechanism 6. The lens position adjusting mechanism 6 includes a lens moving mounting base 60 on which the lens 26 is mounted, and the lens moving mounting base 60.
1, fixing means such as screws 67 and 68 for fixing the lens moving mount 60, an adjusting screw 69 for adjusting the position between the lens moving mount 60 in the left-right direction in FIG. 1, that is, the image sensor 27, the lens moving mount 60 and the base 10. Bracket 10 provided
2 and a return spring 70 stretched between the two. The lens moving mount 60 includes a lens mounting portion 61 which is formed in the central portion and on which the lens 26 is mounted, and elongated holes 6 which are formed on both sides of the lens mounting portion 61 in parallel with each other.
2, 63, hollow portions 64 and 65 provided between the lens mounting portion 61 and the long holes 62 and 63, respectively, and a position regulating portion 66 formed on one side portion. Are integrally molded by. In the lens moving mount 60 configured as described above, the lens 26 is mounted on the lens mounting portion 61, and one end of the lens 26 is covered with the clip 71.
The lens 26 is placed and fixed by tightening and fixing the clip 71 with screws 72 and 73. In addition, the lens moving mount 60 is inserted through the elongated holes 62 and 63 and the base 1
Screw 6 to be screwed into a screw hole (not shown) provided in No. 0.
It is fixed to the base 10 by fixing means such as 7, 68. The adjusting screw 69 is screwed into a screw hole (not shown) formed in the bracket 102 provided on the base 10, and the tip of the adjusting screw 69 abuts on the position restricting portion 66 formed on the lens moving mount 60. The position of the lens moving mount 60 is adjusted by rotating this and moving its tip forward and backward with respect to the position restricting portion 66.

Next, the image sensor position adjusting mechanism 7 will be described. The image sensor 27 is attached to the sensor attachment plate 71 of the image sensor adjustment mechanism 7.
Image sensor 2 mounted on the sensor mounting plate 71
7 is fitted into a hole 722 formed in the sensor holder 72, and is attached to the height adjusting plate 73 by screws 90 and 91 together with the sensor mounting plate 76 and the sensor holder 72. The height adjusting plate 73 has mounting portions 731 and 732 formed at both end portions and bent in the horizontal direction, a window portion 735 formed in the central portion, and a cutout portion 7 formed in the central portion of the upper end.
36 and is attached to the adjustment attachment plate 74 as described later. The adjustment mounting plate 74 includes a base portion 75 that is adjusted and fixed on the device base 10, and a mounting portion 76 that is formed to stand substantially vertically from the base portion 75. The base 75
Is a portion 75 that extends to the left and right with respect to the mounting portion 76.
2, 753 and 751 are provided. In addition, the base 75 is
An elongated hole 754 that is vertically long in FIG. 1 is provided at one end thereof.
However, at the other end, a long hole 75 that is long in the left-right direction in FIG.
5 is formed. Further, the elongated hole 7 is formed in the base 75.
54 on the outside of 54 and hole 7 on the outside of the slot 755.
57 is formed. The hole 756 and the hole 757 are provided on the extension line S of the light receiving surface 271 of the image sensor 27 as shown in FIG. The mounting portion 76 has mounting portions 761 and 762 that are horizontally bent at both ends thereof.
A window portion 766 formed in the central portion, and an elongated hole 768 formed in a bent portion 767 formed in the lower central portion. The mounting portion 76 of the adjustment mounting plate 74 configured as described above
The mounting portions 731 and 732 of the height adjusting plate 73 are placed on the upper surfaces of the first and second 762 via the coil springs 81 and 82, respectively.
Holes 733, 73 formed in the mounting portions 731, 732, respectively
4 and the coil springs 81 and 82 are inserted, and the adjusting screw 8
8 and 89 are arranged, and the adjusting screws 88 and 89 are respectively screwed into screw holes 763 and 764 formed in the mounting portions 761 and 762 of the adjusting mounting plate 74, respectively. Is adjusted and attached to the adjustment attachment plate 74.
Reference numeral 83 in the figure is a bent portion 767 of the adjustment mounting plate 74.
The adjustment mounting plate 7 is provided with a pin that is inserted through the elongated hole 768 formed in the base plate and the hole 107 formed in the device base plate 10.
4 or the center of rotation of the image sensor 27. 84, 8
5 are screw holes 103, 10 formed in the device base 10 by inserting holes 756, 757 formed in the base 75 of the plain mounting washers 86, 87 and the adjustment mounting plate 74, respectively.
The adjusting and mounting plate 74 is fastened and fixed to the device base 10 with screws, which are fixing means screwed into the respective parts 4. The diameters of the holes 756 and 757 formed in the base portion 75 of the adjustment mounting plate 74 are considerably larger than the diameters of the screws 84 and 85. When the screws 84 and 85 are loosened, the adjustment mounting plate 74 is released.
Can be moved and adjusted. Reference numeral 77 denotes a focus left / right difference adjusting cam which is provided by being inserted through an elongated hole 754 formed in the base portion 75 of the adjustment mounting plate 74, and which is inserted through the hole 105 formed in the device base 10 and has its tip at the end of the device. Foundation 10
The adjusting means is constituted by engaging with a hole 792 formed in the leaf spring 79 arranged on the lower surface of the. Reference numeral 78 denotes an adjustment cam which is provided by inserting it into an elongated hole 755 formed in the base portion 75 of the adjustment mounting plate 74 and which adjusts the width direction of the image sensor.
The hole 106 formed in the device base 10 is inserted, and the tip end thereof is engaged with the hole 802 formed in the leaf spring 80 arranged on the lower surface of the device base 10 to form an adjusting means. Since both the adjusting means have the same structure, the adjusting means constituted by the adjusting cam 78 will be described in detail with reference to FIG. The adjusting cam 78 is composed of an actuating portion 781, an eccentric cam shaft 782, a rotating shaft 783 and a locking portion 784, and is integrally molded of synthetic resin. In the adjusting cam 78 configured in this way, the eccentric cam shaft 782 is provided in the elongated hole 7 formed in the base portion 75 of the adjusting mounting plate 74.
55, the rotary shaft 783 is inserted through the hole 106 formed in the device base 10 and the hole 802 formed in the leaf spring 80, and the locking portion 784 is engaged with the lower surface of the leaf spring 80. By assembling, the adjusting means is constructed.

Next, the adjusting operation of the above-mentioned image sensor position adjusting mechanism will be described.

When adjusting the position of the image sensor 27, first, the screws 84 and 85 are loosened. Next, when adjusting the width direction of the image sensor 27, when the adjustment cam 78 is rotated, the eccentric cam shaft 782 causes the adjustment mounting plate 74 to move in the vertical direction in FIG. 1 to adjust it to a predetermined position. it can. When adjusting the left / right difference of the image sensor, when the adjustment cam 77 is rotated, the eccentric cam shaft 782 causes the adjustment mounting plate 74 to rotate about the pin 83, thereby adjusting the left / right difference of the focus. it can. The adjustment cams 77 and 78 are always pulled downward in FIG. 2 by the spring force of the leaf springs 79 and 80 as described above, and the lower surfaces of the eccentric cam shafts 772 and 782 are pressed against the base plate 10, Since the load due to the frictional force acts and the rotation is regulated, even if one is rotated, the other is not rotated during the above adjustment, and the adjustment of the image sensor 27 in the width direction and the image sensor 27 are performed. The focus left / right difference can be adjusted accurately and reliably. After the position of the image sensor 27 is adjusted in this manner, the screws 84 and 85 are retightened to securely fix the adjustment mounting plate 74 to the base plate 10, so that the position adjustment work of the image sensor can be performed. Complete. At the time of the above adjustment and tightening and fixing, the base portion 75 of the adjustment mounting plate 74 has portions 752, 7 extending to the left and right sides of the mounting portion 76.
Since 53 and 751 are provided, the positional relationship of the image sensor 27 does not change during adjustment and during fastening and fixing. Further, a hole 756 and a hole 757 which are formed in the base portion 75 of the adjustment mounting plate 74 and serve as a fixing portion of the adjustment mounting plate 74.
Is provided on the extension line S of the light receiving surface 271 of the image sensor 27, the influence of the bending of the base portion 75 due to the tightening force of the screws 84 and 85 which are inserted and tightened through the holes 756 and 757 is influenced by the image sensor. It does not have a large effect on.

[0024]

The image sensor position adjusting mechanism according to the present invention is configured as described above, and according to the first invention, the base portion of the adjusting mounting plate for mounting the image sensor is located on both left and right sides of the image sensor mounting portion. Since it has a portion extending to, the positional relationship of the image sensor does not change during adjustment and during fastening and fixing. Therefore, it is not necessary to readjust after the adjustment, and the adjustment work time can be shortened.

According to the second aspect of the present invention, since the fixing portion formed on the base portion of the adjustment mounting plate on which the image sensor is mounted is provided on the extension line of the light receiving surface of the image sensor, the fixing means The influence of the bending of the base portion due to the tightening force does not significantly affect the image sensor. Therefore,
The positional relationship of the image sensor does not change between the adjustment and the fastening and the readjustment is not necessary after the adjustment, so that the adjustment work time can be shortened.

According to the third aspect of the present invention, the fixing position of the adjustment mounting plate on which the image sensor is mounted is adjusted.
Since the regulating means for regulating the rotation of each of the adjusting cams is provided, it is possible to prevent the other adjusting cam from rotating when rotating the one adjusting cam. Therefore, adjustment is easy and its accuracy is reliable, and there is no need to readjust after adjustment.
The adjustment work time can be shortened.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of an image sensor position adjusting mechanism according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a perspective view of the image sensor position adjusting mechanism in FIG. 1 of the present invention.

FIG. 4 is an exploded perspective view of the image sensor position adjusting mechanism in FIG. 1 of the present invention.

FIG. 5 is a sectional view of a main part of a conventional image sensor position adjusting mechanism.

FIG. 6 is a cross-sectional view of essential parts showing a fixed state of a conventional image sensor position adjusting mechanism.

FIG. 7 is a schematic cross-sectional view showing the internal structure of the document reading device.

[Explanation of symbols]

 2: Optical system 6: Lens position adjusting mechanism 7: Image sensor position adjusting mechanism 10: Device base 26: Lens 27: Image sensor 71: Sensor mounting plate 72: Sensor holder 73: Height adjusting plate 74: Adjustment mounting plate 75: Base 76: Mounting part 77: Adjustment cam 78: Adjustment cam 79: Leaf spring 80: Leaf spring 84: Screw 85: Screw 88: Adjusting screw 89: Adjusting screw 754: Long hole 755: Long hole

Claims (5)

[Claims] 1. A document reading device in which a document is illuminated and scanned, and reflected light from the document is guided to an image sensor by a lens, the base being adjusted and fixed on a device base, and substantially perpendicular to the base. An adjustment mounting plate having a mounting portion for standing up on the image sensor and mounting the image sensor, an adjusting means for adjusting a fixing position of the adjustment mounting plate, and a fixing means for fixing the adjustment mounting plate to the base. In the image sensor position adjusting mechanism in the original reading device having the following, the adjustment mounting plate has the bases formed on both sides of the mounting portion, The image sensor position adjusting mechanism in the original reading device. 2. The image sensor position adjusting mechanism in the document reading apparatus according to claim 1, wherein the adjusting mounting plate has a fixing portion provided by the fixing means on an extension line of a light receiving surface of the image sensor. 3. A document reading device in which a document is illuminated and scanned, and reflected light from the document is guided to an image sensor by a lens, the base being adjusted and fixed on a device base, and substantially perpendicular to the base. An adjustment mounting plate having a mounting portion for standing up on the image sensor and mounting the image sensor, an adjusting means for adjusting a fixing position of the adjustment mounting plate, and a fixing means for fixing the adjustment mounting plate to the base. In the image sensor position adjusting mechanism in the original reading device, the adjusting mounting plate is provided with a fixing portion by the fixing means on an extension line of a light receiving surface of the image sensor. Image sensor position adjustment mechanism. 4. A document reading device in which a document is illuminated and scanned, and reflected light from the document is guided to an image sensor by a lens, the base being adjusted and fixed on a device base, and substantially perpendicular to the base. An adjustment mounting plate having a mounting portion for standing up on the image sensor and mounting the image sensor, an adjusting means for adjusting a fixing position of the adjustment mounting plate, and a fixing means for fixing the adjustment mounting plate to the base. In the image sensor position adjusting mechanism in the original reading apparatus having :, the adjusting means includes an eccentric cam shaft that fits in an elongated hole formed in the adjustment mounting plate, and a rotating member that fits in the hole formed in the base. Two adjusting cams each having a moving shaft, an eccentric cam shaft, and an actuating portion for rotating the rotating shaft, and a restricting means for restricting each rotation of the adjusting cam. In the document scanning device Image sensor position adjustment mechanism. 5. The image sensor position adjusting mechanism in the document reading apparatus according to claim 4, wherein the restricting unit is a spring unit disposed between the adjusting cam and the apparatus base.