JPS6028432B2 - Original reading optical block adjustment method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a manuscript processing method for adjusting the processing optical axis of a manuscript processing optical block used in a solid-state electronic scanning type manuscript processing section using a one-dimensional photodiode array. The present invention relates to an optical block adjustment method and apparatus.

In general, document handling units used in facsimile machines and the like are broadly classified into mechanical scanning systems and solid-state electronic scanning systems.

FIG. 1 is a basic configuration diagram of a document reading section using a solid-state electronic scanning method using a one-dimensional photodiode array.

In the figure, 1 is a document that travels in the direction of arrow a, 2 is a readout line that scans the width of the document, and two fluorescent lights 3 are arranged one behind the other on the output line 2. The crab light lamp 3 illuminates the original 1 including the readout line 2. Further, on the readout line 2, four photodiode arrays 5 are arranged, which divide the effective readout width 2 into four and condense the reflected light from each of them onto the light receiving element surface via the reduction lens 4. Each of the four combinations of the reduction lens 4 and the photodiode array 5 is used to provide the necessary effective width. Second
The figure is a perspective view specifically showing the optical block for removing mystery documents in the document reading section as described above in a conventional facsimile machine, and FIG. 3 is a sectional view of one of the blocks. Photodiode array - 4 sets (
The system is divided into four blocks (4 blocks) to maximize the effectiveness of discussions.

Each flock has a common base and is constructed in the same way. In the figure explaining one block here, 11 is the optical axis of the opening line, 12 is the reduction lens, and this vertical 4 lens 12 is the lens mount. The lens holder 13 is held in the V-shaped grooves 1 and 4 on the lens holder 13 by a lens holding fixture 15, and the lens mount 13 projects from the base 16. Further, on the readout line optical axis 11 on the rear side of the reduction lens 12, a photodiode array 17 is provided by being inserted into a socket 18, and the socket 18 is soldered to a substrate 19.
This board 19 is attached to the adjustment plate 20 with four setscrews 21.
It is fixed with adjustment plate 2 and L stand 22.
The L stand 22 is mounted on the base 16 and is held by a set screw 25 and a positioning rotation pin 26. In such a manuscript discussion optical block, the V-shaped groove 14 on the lens mount 13 is aligned with the output line optical axis 11.
In other words, the optical axis of the reduction lens 12 held in this V-shaped groove 14, that is, the output line optical fiber 11 can be obtained with high precision.

On the other hand, the position and orientation of the photodiode array 17 must be adjusted with respect to the output line optical axis 11. In this case, the photodiode array 17 is arranged in the x-axis direction shown by arrow a in FIG. 4, the y-axis direction shown by arrow b, the z-axis direction shown by arrow c, and the The position must be adjusted in the A rotational direction indicated by d and in the B rotational direction indicated by arrow e.Therefore, the above-mentioned manuscript discussion optical block is provided with an adjustment mechanism for this purpose.

That is, as shown in FIGS. 2 and 3 above, a conical roller 27 is provided below the adjustment plate 20, and this conical roller 27 connects the end of the adjustment screw 28 that passes through the vertical surface 23 of the L stand 22. installed on. therefore,
By moving the conical roller 27 back and forth using the adjustment screw 28, the pressure spring 29 is pressed to move the adjustment plate 20 up and down along the vertical plane 23, thereby changing the position of the photodiode array 17 in the Y direction. Adjust to. There are two sets of the rollers 27 and adjustment screws 28 on the left and right,
With this, position adjustment in the A rotation direction can also be performed. Further, a conical roller 30 is provided on one side of the adjustment plate 20, and this conical roller 30 is attached to the end of an adjustment screw (not shown).
Adjust the position in the x-axis direction in the same way using the and adjustment screws. Note that the pressing spring 29 is formed by conical rollers 27, 30.
It is provided to press down the adjustment plate 20 on the opposite side, and is attached to the L stand 22. This L stand 22 is fixed on the base 16 in the Z-axis direction by a positioning rotation pin 26, and therefore the photodiode array 17 is also fixed in the Z-axis direction. Therefore, the position adjustment in the vertical direction is performed by moving the reduction lens 12 along the V-shaped groove 14. Further, an adjustment screw 32 is screwed onto a tongue portion 31 protruding from the base 16 so as to push the rear end side of the L stand 22.
By rotating the L stand 22 around the positioning rotation pin 26, the position in the B rotation direction is adjusted. In this way, the photodiode array 17 is adjusted in five different positions. In the original reading optical block shown in FIGS. 2 and 3, the reduction lens 12 and the photodiode array 17 are 4 sets (4 blocks)
It is provided. Therefore, the above-mentioned adjustment is performed in order from the first block to the fourth block, and after adjustment, the adjustment plate 20 and L stand 22 are fixed with set screws 24 and 25. However, in such a manuscript discussion optical block, the position of the photodiode array 17 is adjusted in five different ways with high accuracy with respect to the output line optical column 11, so the adjustment mechanism is complex and requires a large number of parts. The number of points increased, and it became expensive.

Also, basically, having such a complex and delicate adjustment mechanism has many negative aspects in terms of mass production and transportation of products such as facsimile machines, and especially the drawback that it takes a long time to adjust. be. In order to solve these problems, a document reading optical block 40 as shown in FIGS. 5 to 7 has been proposed.

That is, in FIGS. 5 to 7, reference numeral 41 indicates a readout line optical axis, and 42 indicates a base. Lens holder portions 43 are provided at four locations on the base 42 to protrude upward.

A through hole 44 is formed in the lens holder portion 43 in a direction parallel to and on the same plane as the readout line optical axis 41, and a reduction lens 45 is inserted into the through hole 44. In this case, the contraction lens 45 is fixed at a predetermined position within the through hole 44 by a set screw 46 screwed into the lens holder portion 43 . In addition, studs (protrusions) 471 to 473 are screwed onto the rear end surface of the lens holder portion 43 and positioned at each vertex of the triangle. Lens holder part 43
A photodiode array 48 is arranged on the rear side of each. In this case, the photodiode array 48 is directly attached to the wiring board 49 by soldering or the like. Further, holes 50, - 503 are bored in the wiring board 49 in correspondence with the studs 47, - 473, and these holes 50,
503 is formed to be larger than the diameter of the tips of the studs 471 to 473 by several tenths in order to enable slight movement of the wiring board 49, which will be described later. Then, this hole portion 50. ~503, insert the ends of studs 47 and ~473 into wiring board 49 and photodiode array.
48 is disposed on the rear side of each lens holder section 43, and then the wiring board 49 is slightly moved using a jig equipped with an adjustment mechanism to adjust the photo position relative to the optical axis of the reduction lens 45, that is, the exposure line optical fiber 41. Adjusting the position of the audio array 48 (
After adjusting the positions in the X-axis direction, Y-axis direction, Z-axis direction, A rotation direction, and B rotation direction shown in FIG. 4
9 is fixed to the lens holder section 43. In this case, solder 5
1 uses eutectic solder, which prevents the photodiode array 48 (wiring board 49) from shifting due to solder shrinkage during soldering. A suitable adhesive, thermosetting synthetic resin, etc. may be used instead of solder. The manuscript reading optical block configured as described above is
The base 42 is attached to a facsimile machine (not shown) using fixing screws 52 provided at both ends. In such a document reading optical block, the optical block itself has a complicated structure and does not have an adjustment mechanism that requires delicate adjustment and special care in handling.The structure is simplified and is suitable for mass production. This is convenient in terms of transportation, and the position adjustment of the photodiode array is simplified, reducing adjustment time and improving reliability, allowing for highly accurate and stable manuscript discussion without deviation. It is.

An object of the present invention is to further enhance the advantages of the above-mentioned excellent original reading optical block, and to provide a document reading optical block adjustment method and method for accurately and quickly adjusting the reading optical axis of the original reading optical block. The purpose is to provide equipment. Next, the present invention will be explained with reference to the embodiments shown in FIGS. 8 and 9.

The original reading optical block adjusting device 60 shown in FIG.
The apparatus includes a main body 62 having an optical block support device 61 for supporting the document processing optical block 40 in a predetermined position as shown in FIGS. 5 and 6.

The main body 62 is composed of two plate members supported by four stays 63 in parallel and spaced apart. In this example, the optical block support device 61 is mounting surfaces 64 and 65 formed on a portion of the slope member of the main body 62. When the optical block 40 is mounted on the mounting surfaces 64 and 65 and fixed with a suitable device, the optical axis 41 of the optical block 40 becomes vertical. The main body 62 is also provided with a rotating drum 66 rotatable on a rotating pin shaft 67.

The rotating drum 66 supports a test chart 68 fixed to its surface in a plane substantially perpendicular to the optical axis 41 . Above the rotating drum 66, a main body 62 is provided.
Two illumination lights 69 mounted on the rotary drum 66 are provided to illuminate the surface of the test chart 68 on the rotating drum 66 from which it is read. The original reading optical block adjustment device further includes an adjustment device 70 provided on the main body 62. The adjustment device 7 supports a substrate holder 71 on it, and as will be described in detail later, the photodiode array 48 on the wiring board 49 supported by the substrate holder 71 is
The wiring board 49 is aligned with the discussion optical axis of the lens 45 of the optical block 40 so that proper discussion can be performed.
The position and posture of the lens 45 are finely adjusted with respect to the lens 45. For this purpose, the adjustment device 70 rotates the Z-axis rotation mechanism 7.
2. Z-axis fine movement mechanism 73, X-axis fine movement mechanism 74,
An axial fine movement mechanism 75 and a Y-axis rotation mechanism 76 are provided. All of these may be publicly known. Basic holder 7
1 supports a wiring board 49 at its tip. The supported wiring board 49 is positioned such that the projections 47 and 473 provided on the rear end surface of the lens holder portion 43 of the optical block 40 are loosely received in the holes 50 and 503 (see FIG. 7), respectively. is in Therefore, in this state, if the adjusting device 70 is operated to move the board holder 71, the wiring board 49 and therefore the lens 45 of the photodiode array 48 will be moved.
You can adjust the position in various ways. A lead wire 77 extending from the wiring board 49 is provided on the main body 62 and can be electrically connected to a connecting device 76 for supplying the read output of the photodiode array 48 on the wiring board 49 to the outside.

In the illustrated example, this connection device 78 is further connected to a sensor scan circuit 79. The cutout output is further displayed on an oscilloscope (not shown) via a head amplifier circuit 80. The test chart 68 used in the document processing optical block adjusting device 60 of the present invention can be easily and accurately adjusted by using a test chart 68 as shown in FIG.

The test chart 68 is a plate-like piece of paper or the like having approximately the same dimensions and shape as the original, and is black on a white background, with a plurality of focus and magnification adjustment lines 81 provided at intervals on one side, and a starting line. A linearity adjustment line 82 and a diagonal seam adjustment line 83 are drawn. These lines 81 and 82 extend in the direction of the rotary drum by a distance corresponding to the effective required reading width of the document. To adjust the original discussion optical block, a test chart 68 as described above is placed on the circumferential surface of the rotating drum 66 of the original discussion optical block adjustment device 60, and the optical block supporting device 61 of the optical block 40 to be adjusted is placed. Place it on top and secure it with bolts, etc. not shown.

At this time, the wiring board 49 is removed from the optical block 40. This wiring board 49 is then placed on the tip of the board holder 71 so that the holes 50 to 503 of the wiring board 49 can loosely receive the protrusions 47 to 473 of the optical block 40, respectively. A lead wire 77 extending from the wiring board 49 is electrically connected to a connecting device 78, and an output terminal (not shown) of the head amplifier circuit 80 is further connected to a suitable oscilloscope (not shown). First, one of the many lenses 45 of the optical block 40 is selected, and the test chart 68 is read using the photodiode array 48 for this lens.

At this time, the focus and magnification adjustment lines 81 are first read and the output is displayed on the oscilloscope. While watching this displayed read signal output, maximize the modulation depth.
At the same time, match the linearity and match the left and right signal outputs using the output signal. This adjustment is performed by rotation about the Y axis, ie, B rotation. Next, the output of the linearity adjustment line 82 is displayed on the oscilloscope using the same lens. While watching this display, adjust so that the output signal changes simultaneously from white to black level or from black to white level on the left and right sides within the effective reading width of the lens by fine movement in the Y-axis direction and A rotation around the Z-axis. Further, for the same lens, fine movement adjustment in the x bag direction is performed so that the straight line resulting from the discussion output of the vertical line 84 of the seam adjustment diagonal line 83 becomes the discussion start end for that lens. The negotiated optical axis adjustment for the first lens is now complete.

Therefore, in this state, the wiring board 49 is fixed to the protrusion 47 of the optical block 40 using solder or the like as described above. Next, to adjust the second lens, move the substrate holder 71
, repeat the adjustment made for the first lens for the second lens, and then adjust the diagonal line 83 for seam adjustment.
Similarly, while rotating the rotary drum 68 and moving the diagonal line 83, the order in which the signals and outputs change is observed, and the X enemy direction adjustment is performed.

This completes the adjustment of the second lens itself and the adjustment of the first lens. Therefore, in this state, the second lens is fixed with solder or the like as before. By performing the same adjustment as for the second lens one after another for the third lens and subsequent lenses, it is possible to adjust a large number of lenses 45 of the optical block 40 and to adjust the optical block 40 as a whole.

According to the original reading optical block adjustment method and device of the present invention, the structure is simple and inexpensive, and difficult optical adjustment of the optical block can be easily, quickly and accurately performed, and the adjusted original reading optical block can be mass-produced. can be realized.

[Brief explanation of the drawing]

Fig. 1 is a board configuration diagram of a manuscript discussion section using a solid-state electronic scanning system, Figs. 2 and 3 are perspective views and cross-sectional views of a conventional manuscript discussion optical block, and Fig. 4 is a photodiode array. Figures 5 to 7 for explaining the position adjustment of
The figures are views showing a manuscript processing optical block related to the present invention, in which Figure 5 is a perspective view, Figure 6 is a sectional view, Figure 7 is a back view of the wiring board section, and Figure 8 is a manuscript of the present invention. FIG. 9 is a schematic diagram of a discussion optical block adjustment device, and is a plan view showing an example of a test chart used in the present invention. 40... Optical block: 41... Optical axis; 45"""Lens;48""" Photo diode array; 49...... Wiring board; 60... Original preparation optical block adjustment device: 61...Optical block support device: 62...Main body; 66...
・Rotating drum; 68... Bust chart; 70...
...Adjustment device; 71...Substrate holder; 78...
・Connection device. Figure 1 Figure 3 Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1. At least one lens holder portion in which a through hole is formed.
A pace having a projection provided on the rear end surface of the lens holder part, a lens fitted into each of the through holes, and a wiring board that can be fixed to the projection and arranged on the rear side of each lens holder part. and a photodiode array that is directly attached to each of the wiring boards and arranged corresponding to the optical axis of the lens, in which the mechanism for adjusting the reading optical axis is described above. An adjustment device separate from the optical block is provided, the optical block is supported by the adjustment device, a test chart is supported at a predetermined distance from the optical block, and the test chart is photoelectrically converted by the photodiode array. reading,
The reading optical axis of the optical block is adjusted while displaying the reading output on the display device, and after this adjustment is completed, the wiring board is fixed to the protrusion by soldering, and after that, the optical block is adjusted as described above. A method for adjusting a document reading optical block, which is used after being removed from an apparatus. 2. Document reading according to claim 1, wherein the test chart has a plurality of focus and magnification adjustment lines provided at 1 mm intervals, readout line linearity adjustment lines, and readout seam adjustment oblique lines. Optical block adjustment method. 3 At least one lens holder portion in which a through hole is formed
A base having a protrusion on the rear end surface of the lens holder, a lens fitted into each of the through holes, and wiring that can be fixed to the protrusion and is disposed on the rear side of each lens holder. A document reading optical block adjustment device for adjusting the reading optical axis of a document reading optical block comprising a substrate and a photodiode array directly attached to each of the wiring boards and arranged corresponding to the optical axis of the lens. A main body, an optical block support device provided on the main body for supporting the optical block in a predetermined position, and a substantially optical axis of the optical block supported by the optical block support device. a rotating drum that supports a test chart in a perpendicular plane; a board holder provided on the main body that supports the wiring board so that the photodiode array is substantially aligned with the reading optical axis of the lens; and the board. the position and orientation of the wiring board with respect to the lens such that the photodiode array on the wiring board provided between the holder and the main body and supported by the board holder is aligned with the reading optical axis of the lens; and a connecting device for electrically connecting the photodiode array to a device for displaying the readout output of the photodiode array.