JPS6174445A - Optical picture reader - Google Patents

Abstract

PURPOSE:To improve the reliability of the titled reader by using a guide pin so as to incorporate a support supporting an RLA being an optical system and a support of an image sensor thereby applying position adjustment between the sensor and the optical system easily and accurately. CONSTITUTION:The RLA2 being an optical system of an optical reader is supported by an RLA support 4, an image sensor 6 is arranged in opposition to the RLA2 and the sensor 6 is supported to the image sensor support 12. A guide hole 10 is formed to four corners of a face of the support 4 opposed to the sensor 6 so as to be directed in the optical axis direction Y of the RLA2. Further, a slidable guide pin 14 mated to the hole 10 is provided to the support 12 and a reference face 16 of the sensor 6 of the support 12 is made a face X vertical in the optical axis direction. Further, a through-hole 18 penetrated from the reference face 16 to the opposite side is formed to the support 12 and a lead pin 8 of the sensor 6 is penetrated through the hole 18. Then the lead pin 8 is locked to the lock member 20 to adjust the position between the sensor 6 and the RLA2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical image reading device used in facsimile machines, copying machines, etc. The present invention relates to an optical image reading device that can perform image reading.

[Conventional technology]

An optical image reading device generally includes a light source for illuminating a document to be read, an image sensor serving as a photoelectric conversion means for reading, and an optical system for forming an image of the surface of the document on the image sensor.

In recent years, there has been an increasing demand for optical image reading devices to be smaller, lighter, and cheaper.

There is a strong demand for optical reading devices to be smaller, lighter, and lower in price, which are installed in printers such as 1 in 1 word des rosés and printers, and the printer also serves as a document reader. Therefore, instead of the spherical lens conventionally used as an optical system, there is a tendency to adopt a new rod lens array (hereinafter abbreviated as RLA) in which a plurality of light-converging glass fibers are arranged.

By the way, the image reading device installed in the above printer uses CCD or MOS Dio as an image sensor.
Since a primary element (line-like element) such as a d array is used, it is necessary to perform position adjustment for line alignment between the RLA and the image sensor and alignment according to the optical characteristics of the RLA.

FIG. 8 shows all adjustment elements related to position adjustment between the RLA of the optical image reading device and the image sensor. Here, 80 is an original to be read, 82 is an RLA), and 84 is an image sensor. Incidentally, the positions of the RLA 82 and the image sensor 84 whose positions have been adjusted need to be further adjusted with respect to the document 80 in the end.

By the way, as a result of the inventor's intensive studies, the adjustment elements y, It was found that adjustment had the greatest effect on image reading characteristics. In other words, if the adjustment of 7.1 and T is insufficient, the resolution will deteriorate (
MTF deterioration) occurs, making it impossible to read the original 80 faithfully to the image information. In addition, ψ also causes skew reading of the manuscript.

Therefore, the minimum is 71! and ψ adjustment is required.

FIG. 9 is a perspective view showing a conventional method for adjusting y, x, and ψ as described above.

That is, in the conventional optical image reading device, RLA82
A support 86 is fixed to the image sensor 84, and a support 88 is also fixed to the image sensor 84.
Conventionally, the optimum positional relationship was found by relative movement between the two, and then fixed with adhesive or the like. However, in order to make such an adjustment, it is necessary to provide an adjustment allowance between the supports 86 and 88, and therefore the adjustment is extremely troublesome. That is, in order to adjust one adjustment element, the image sensor-support 88 is
When it is moved in a predetermined direction relative to the support 86, other adjustment elements are likely to change due to this movement. For example yv4
If you try to adjust it, a shift in θ tends to occur, and
There is a problem in that adjustments regarding each adjustment element cannot be made independently, such as a tendency for deviations in ψ to occur when attempting to make adjustments. Also, such a so-called! In the case of 1, the position of the image sensor support 88 is adjusted without coming into close contact with the RLA support 86, so it is difficult to fix the image sensor while maintaining the adjusted positional relationship. There is.

The adjustment process described above is the cost of optical image reading devices.
It's easy and reliable because it has a big impact on the design! A four-way system is desired.

[Means for solving problems]

According to the present invention, in order to solve the above-mentioned various problems, an image sensor support is provided that is slidable in the optical axis direction of the optical system with respect to the optical system support. The support has a reference plane perpendicular to the optical axis formed at a position facing the optical system, and has a notch or hole for allowing a part of the image sensor to pass through, and has a notch or hole on the reference plane. An image sensor is disposed, a part of which extends through the image sensor support, and a member for bringing the image sensor into close contact with and locking the image sensor on the reference surface. An optical image reading device is provided.

[Example] Hereinafter, specific examples of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing a part of a first embodiment of an optical image reading device according to the present invention, and FIG.
It is an I-U sectional view.

In these figures, 2 is an optical system RLA;
The RLA 2 is fixedly attached to a support 4. On the other hand, 6 is an image sensor/cer disposed opposite to RLA 2, 8 is a lead pin which is an extension of the image sensor/cer, and a read image electrical signal that has been photoelectrically converted is outputted through the lead pin 8.

Guide holes 10 are formed in the RLA support 4 at four corners of the surface facing the image sensor 6. The guide hole 10
is formed to point exactly in the optical axis direction of RLA 2, that is, in the X direction. 12 is an image sensor support body;
A guide pin 14 that fits into the guide hole 10 and is slidable is attached to the support body 12 . The image sensor 6 mounting surface 16 of the image sensor support 12 is RL
A plane perpendicular to the optical axis direction of 2 (hereinafter referred to as "reference plane")
It becomes. Two through-hole portions 18 are formed in the support body 12, penetrating from the reference surface 14 to the opposite surface 17. The through-hole portion 18 can receive the leaf pin 8 of the image sensor 6 with a sufficient margin, so that the image sensor 6 can move within an appropriate range on the reference plane 14. Image sensor-reference plane 16 of support 12
A surface 17 on the opposite side is formed parallel to the reference surface 16, and a locking plate 20 for locking the lead pin 8 of the image sensor 6 is disposed on the surface 17. It is fixed to the locking plate 20 with adhesive or the like.

This locking is performed while the image sensor 6 is in close contact with the reference surface 16 of the support 12. This locking plate 2
It is preferable to use a wiring board for extracting a read image electrical signal from the image sensor 6 as the wiring board 20. In this case, the beam dowel 8 and the wiring board 20 are fixed by soldering.

In the image reading apparatus of this embodiment, the positional adjustment between the RLA 2 and the image sensor 6 is performed as follows.

(1) Adjustment in the X direction The image sensor is adjusted in the guide hole 10 of the RLA support 4.
Slide the guide pin 14 of the support body 12 in the X direction. During this sliding, other adjustment elements remain unchanged.

(2) Adjustment image sensor 6 in the X direction and ψ direction and the locking plate 20 fixed thereto
and are moved relative to the image sensor support 12. This movement is performed simultaneously in the X direction and the ψ direction while the image sensor 6 is in close contact with the reference surface of the support 12. The through hole portion 18 provided in the support body 12 is formed with a relatively large margin, so that adjustment by this movement is possible.

Note that this movement allows adjustment in two directions as well.

After the position is adjusted as described above, the RLA support 4 and the guide pin 14 are fixed by applying adhesive around the guide hole 100, and the adhesive is injected into the through hole portion 18. The lead pin 8 of the image sensor 6 and the image sensor support 12 are fixed by K.

FIG. 3 is a partially cutaway perspective view showing a part of the second embodiment of the optical image reading device according to the present invention), and FIG.
It is a V-IV sectional view. In these drawings, the same reference numerals are given to the same members as in FIGS. 1 and 2.

In this embodiment, the shapes of the RLA support 4 and the image sensor support 12 are different from those of the first embodiment. That is, the RLA support 4 has a large recess formed in the center of the surface facing the image sensor 6, and the side wall 10' of the recess is similar to that of the first embodiment. It has the same effect as the guide hole 10. That is, on the periphery of the image sensor support 12, there is a protrusion 14 having a shape that matches the side wall 10' of the recess of the R1, A support 4.
' is formed, and the protrusion 14' has the same function as the idle pin 14 in the first embodiment.

According to the device of this embodiment, since the RLA support 4 and the image sensor support 12 have a large sliding contact area, adjustment in the X direction becomes easier.

Furthermore, according to the device of this embodiment, the image sensor-support body 1
Since light is shielded by the protrusion 14' on the periphery of 2,
It is possible to prevent external light from entering the image sensor 6.

FIG. 5 is a schematic perspective view showing an example of the usage state of the optical image reading device according to the present invention, FIG. 6 is a partially cutaway enlarged perspective view thereof, and FIG. ■-■ It is a sectional view.

This example shows an example in which an optical image reading device is mounted on the carriage of a thermal transfer serial printer device used as an output device for a word processor.

In the figure, reference numeral 50 denotes a platen roller of the printer), and recording paper or an original to be read 52 is wound around the platen roller F-50. 54 is a recording paper or manuscript 52
This is a paper press roller for pressing the paper against the platen roller 50. On the other hand, 56 is a carriage guide fixed to the main body of the printer in parallel with the platen roller 50.A carriage 58 is attached to the guide 56, and the carriage 58 is moved by an appropriate driving means. is caused to reciprocate along the id 56. The carriage 58 is provided with a thermal drawer 0 at a position facing the platen roller 50, and an inkliden cassette 62 is placed on the carriage 58.

The ink ribbon 64 in the cassette 62 is wound around the thermal roller passing between the drawer 0 and the platen roller 50.

An optical image reading device 66 according to the present invention is mounted on the carriage 58. The image reading device 66 includes the RLA 2 and the image sensor 6, as described in detail in the above embodiment, and further includes a linear light source 68 made of an LED or the like. The RLA 2, the image sensor 6, and the light source 68 are entirely covered by a light-shielding hood 70, but an opening 72 is formed in the light-shielding hood 70 at a position facing the platen roller 50.

Thus, in this example, when used as a word processor printer, the recording paper is wound around the platen roller 50, the carriage 58 is moved along the guide 56, and the thermal head is moved while the ink cartridge 64 is running. 60 is activated, and when used as a one-sided image reader, the original to be read is wound around the platen roller 50 and the original to be read is illuminated by the light source 68 through the opening bottom part 72, and the carriage 58 is moved along the guide 56. While moving the document, the RLA 2 forms an image of the document surface on the image sensor 6.

〔Effect of the invention〕

According to the optical image reading device of the present invention as described above, RL
The position between A and the image sensor can be easily and accurately adjusted, improving reliability and reducing costs.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of the apparatus of the present invention, and FIG. 2 is a cross-sectional view taken along the line 1--2. FIG. 3 is a partially cutaway perspective view of the apparatus of the present invention, and FIG. 4 is a cross-sectional view taken along the line 1--2. FIG. 5 is a perspective view showing the usage state of the device of the present invention, and FIG.
The figure is an enlarged view of a partially cutaway part, and Figure 7 is its ■-
■It is a sectional view. FIG. 8 is a perspective view showing position adjustment elements between the RLA and the image sensor), and FIG. 9 is a perspective view of a conventional optical image reading device. 2: RLA, 4: RLA support, 6: Image sensor, 8 Ni lead pin, 12: Image sensor
Support body, 16: Reference surface, 20: Locking member. Figure 1 Figure 2

Claims (3)

[Claims] (1) In an optical image reading device having an image sensor and an optical system for forming an image of the document surface on the image sensor, the image sensor is slidable in the optical axis direction of the optical system with respect to the optical system support. A support is provided, and the image sensor support has a reference plane perpendicular to the optical axis formed at a position facing the optical system, and a cutout or hole for allowing a part of the image sensor to pass through. an image sensor is disposed on the reference surface, a part of which extends through the image sensor support, and the extended portion has an image sensor in close contact with the reference surface. An optical image reading device characterized in that a member for locking is attached. (2) The optical image reading device according to item 1, wherein the support penetrating extension portion of the image sensor is a lead pin, and the locking member is a wiring board for extracting a read image electric signal from the image sensor. (3) The optical image reading device according to item 1, wherein the sliding portion of the image sensor support with the optical system support also serves as a means for blocking external light from reaching the image sensor.