JPS60825B2 - Image sensor adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image sensor adjustment mechanism in a facsimile machine.

In general, a transmission system in a facsimile machine illuminates an image on a document 1 for each scanning line, as shown in FIG. 1, and images the image on an image sensor 3 using a lens 2.

In order to accurately form an image on the image sensor 3, the positional relationship between the original 1, the lens 2, and the image sensor 3 must be accurate, and as shown in FIG.
It is necessary to adjust the movement in three axial directions. Conventionally, there are various adjustment mechanisms for this purpose; examples include Japanese Patent Publication No. 55-36228 and Japanese Patent Publication No. 55-1809.
This is shown in Publication No. 6. However, conventional devices, including those described in this publication, ``make such adjustments built into the main body of the facsimile, and the adjustment mechanism is complex and the adjustment work is troublesome. The present invention is based on these points, and can be adjusted as a single unit before being incorporated into the facsimile main body.
The object of the present invention is to obtain an image sensor adjustment mechanism that can simplify adjustment work.

An embodiment of the present invention will be explained based on FIGS. 2 to 7.

First, the image sensor 4 is fixed to a PC board 5, which serves as a holding plate, via a socket 6. This PC board 5 is attached to a die-cast lens block 8 having a lens 7 attached to the front side and a square hole large enough to accommodate the image sensor 4 at the rear side, and an adjustment mechanism 9 for fixing the attachment. is provided. First, PC board 5
position it near both ends of the image sensor 4 and
A round hole 10 is formed that coincides with the axial direction, and correspondingly screw holes 11 are formed in the vertical mounting pieces 8a on both sides of the back surface of the lens block 8. A screw 12 is provided together with a washer 13 and a washer 14 to fix the PC board 5 by screwing into the screw hole 11 through this round hole 10. This screw 12 is responsible for adjustment in the x-axis direction, and the round hole 10 is wider than the screw 12. Further, a long notch 15 is formed in the PC board 5 so as to be located above the round hole 10 and parallel to the X-axis direction of the image sensor 4. A corresponding screw hole 16 is also formed in the mounting piece 8a of the lens block 8. Furthermore, a screw 17 is provided which is screwed into the screw hole 16 through the elongated hole 15 to fix the PC board to the lens block 8. Here, this screw 17 is not directly attached, but is inserted through a washer 19 into a hollow adjustment knob 18 having a screw hole in the center, and an eccentric bush 20 is attached to the front surface of this adjustment knob 18. are integrally formed. The diameter of the eccentric bushing 20 and the width of the elongated hole 15 are formed to match. Here, an indicator piece 21 is formed on the outer periphery of the adjustment knob 18 to indicate the maximum position D of the offset bushing 20. Furthermore, in the facsimile main body, a die-cast scanner base 22 that forms an optical path for guiding light from the document side to the lens 7 is fixed to the main body frame, and the terminal end of this scanner base 22 is used as a main body support part 23. has been done.

A positioning receiving part 25 having a screw hole 24 is formed in this main body support part 23, and a stopper piece 26 for regulating the X-axis direction and a stopper pin 27 for regulating the Z-axis direction are provided in a part of the positioning receiving part 25. It is being On the other hand, a horizontal mounting piece 28 is formed on the bottom surface of the lens block 8 to be fixed to the positioning receiving portion 25, and an adjustment mechanism 29 for fixing the mounting piece 28 is provided. Further, an elongated hole 30 is formed in the mounting piece 28 along the Z-axis direction and corresponds to the screw hole 24, and a screw 31 that is screwed into the screw hole 24 through this elongated hole 30 is provided together with a washer 32. ing. Further, a screw hole 33 is formed in the negative side of the lens block 8, and a positioning lever 34 is attached to the lens block 8 with a screw 36 via a washer 35. This positioning lever 34 has an elongated hole 37 formed therein so that it can be adjusted in the Z direction, and has a bent piece 39 on the tip side that comes into contact with the stopper pin 27. Here, the green side of the mounting piece 28 on the positioning lever 34 side is the stopper piece 2.
6 serves as a reference surface 39 in the X-axis direction, and the bottom surface of the mounting piece 28 serves as a reference surface 40 in the Y-axis direction. The center of the lens 7 is set to coincide with the center of the optical path. The adjustment and assembly of such horizontal assembly will be explained.

First, the PC board 5 is temporarily fixed to the lens block 8 using screws 12 and 17. In this state, the PC board 15 can be freely displaced with respect to the steel block 8. Therefore, first, movement adjustment in the Y-axis direction is performed. This adjustment is performed by rotating the left and right adjustment knobs 18 so that the reading line of the image sensor 4 is parallel to the reference plane 40 and coincides with the center of the lens 7. That is,
As shown in FIG. 6, by rotating the adjustment knob 18, the eccentric bushing 20 also rotates, so that the PC board 5 is inserted into the lens through the elongated hole 15 whose diameter and width match the eccentric bushing 20. It will be vertically displaced with respect to block 8 ~
The image sensor 4 attached to this PC board 5 can be adjusted in the Y-axis direction. At this time, since the screws 12 are temporarily fastened through the wide round holes 10, there is no problem with the displacement of the PC board 5. Since an indicator piece 21 indicating the maximum eccentric position of the eccentric bushing 20 which is not visible from the operating side is formed, it serves as an indicator indicating the direction when deflecting the PC board 5 upward or downward, making it easy to perform. After completing the adjustment in the Y-axis direction using the adjustment knob 18, the position in the Y-axis direction is determined by tightening the screw 17.This allows the center line (horizontal) of the lens 7 and the image sensor 4 to be aligned. The cutting line will match.Next, adjust the movement in the x-axis direction.

This adjustment is performed by shifting the PC board 5 in the left-right direction with respect to the lens block 8 so that the center of the reading line of the image sensor 4 coincides with the center of the lens 7 in relation to the reference plane 39. In other words, in the Y-axis direction adjustment fixed state described above, the left and right directions are not fixed, and the PC
The plate 5 can be displaced laterally through the outermost hole 15 using the eccentric bush 20 as a guide. At this time, the eccentric bushing 20 does not rotate because it is fixed by the screw 17 mentioned above, and the diameter of the bridge center push 20 and the width of the elongated hole 15 match, and this elongated hole 16 is adjusted in the Y-axis direction. Since it is parallel to the image sensor 4, the PC board 5 does not deviate in the Y direction, but only in the X axis direction. The amount of deviation of this PC board 5 is determined by the round hole 10' relative to the screw 12.
It is regulated by this. When the adjustment in the x-ball direction is completed through such operations, the position in the x-ball direction is determined by tightening the screw 12. This causes the center of the reading line of the image sensor 4 to coincide with the center of the lens 7. In this way, by attaching and fixing the PC board 5 to the lens block 8 while being adjusted by the adjustment mechanism 9, the positions in the X-axis direction and the Y-axis direction can be accurately determined before assembly to the facsimile main body. ．． That will happen.

Then, by fixing the lens block 8 to which the PC board 5 is fixed to the positioning receiving part 25 of the main body support part 23 with screws 31, rough attachment to the facsimile main body is performed.

At this time, the reference surface 39 is loosened against the stopper piece 26,
By placing the reference plane 40 on the positioning receiving part 25, the image sensor 4 and lens 7, which have been adjusted as described above, are correctly aligned in the X-axis direction and the Y-axis direction with the facsimile main body side. Further, the positional relationship between the document side and the lenses 7 in the Z-axis direction is determined by bringing the bent piece 38 of the positioning lever 34 into contact with the stopper pin 27. here,
To adjust the movement in the Z-axis direction, the positioning lever 34 is adjusted in the Z-axis direction by loosening the screw 36 before assembling the shutter block 8 into the facsimile main body due to the relationship between the position of the shutter 7 and the position of the stopper pin 27. By tightening the rear screw 36, the position in the Z-axis direction can be determined.
Even if the positioning lever 34 is displaced in the Z-axis direction in this way, there is no problem when fixing the positioning lever 34 to the positioning receiving part 25 with the screw 31 because the elongated hole 30 is used. Therefore, according to this embodiment, in a single unit consisting of the PC board 5 to which the image sensor 4 is fixed and the lens block 8 having the lenses 7,
Before attaching the silk to the facsimile main body, the position in all three axes of the It is easy to do as all you have to do is tighten it.

Furthermore, if it becomes necessary to make adjustments even after the facsimile is attached to the main body, the adjustments can be made in the same way as when the facsimile is attached alone. As described above, the present invention includes an adjustment mechanism that fixes the holding plate to which the image sensor is fixed to the lens block so as to be adjustable in the X and Y axis directions, and a mechanism that is provided on the lens block and sets the lens block to the main body support part. Since it is equipped with an adjustment mechanism that allows adjustment of the positioning receiver in the Z-axis direction, the adjustment mechanism can be used to adjust the positions of The position of the shaft in the three-way direction can be determined accurately, thereby simplifying the adjustment work and the assembly work to the facsimile main body.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a general imaging optical system, Fig. 2 is an exploded perspective view showing an embodiment of the present invention, Fig. 3 is a perspective view of a part of the system vertically, and Fig. 4 is Enlarged front view of the adjustment knob,
Fig. 5 is a longitudinal side view of the same; Fig. 6 is a front view in an unadjusted state, and Fig. 7 is a front view after adjustment. 4...Image sensor, 5...PC
Plate (retaining plate), 8...Lens block, 9...
Adjustment mechanism, 23... Body support part, 25...
...Positioning receiver "29...Adjustment mechanism. Room J"' Fig. Girder O Fig. Rare Fig. 0 Fig. J Korea LL Fig. J No. 5 Fig. J plan 6 Fig. Otsu Fig.

Claims (1)

[Claims] 1 While holding the holding plate to which the image sensor is fixed, face the image sensor against the lens block, move it in X and Y directions.
The lens block is provided with an adjusting mechanism for fixing the lens block so as to be adjustable in the axial direction, and an adjusting mechanism provided on the lens block and fixing the lens block as adjustable in the Z-axis direction with respect to a positioning receiver set on the main body support part. Features an image sensor adjustment mechanism.