JPH10271274A - Picture reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relax the dimension tolerance of fitting parts at the periphery of a close contact image sensor and to reduce cost by providing a position adjusting means which adjusts the position of the close contact image sensor for a white platen roller. SOLUTION: Brackets are provided for both sides of a sensor frame 8 for the image sensor 11 and a pair of positioning spacers 18 for adjusting the positions of the close contact image sensor and positioning it are arranged on outer sides of the respective brackets. A pressurizing spring 13 presses the close contact image sensor 11 to the white platen roller 12 along the direction of an arrow 15 with prescribed load. A shubpressurizing spring 14 presses a positioning spacer 18 in the direction of an arrow 16 so that it is abutted on the projecting abutting part 25 formed on a sheet chassis 23 with prescribed load. The positions of fitting screws 18b are adjusted along the hole 18a of the positioning spacers 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus capable of adjusting the position of a contact image sensor,
The present invention relates to a scanner device using a facsimile, a contact image sensor, or an image reading device capable of accurately adjusting the position of a contact image sensor mounted on a copying machine or the like.

[0002]

2. Description of the Related Art In an image reading apparatus, light emitted from a light source in a contact image sensor is applied to a document on a white platen roller, and light reflected by the document is converged on a line sensor in the contact image sensor. Thus, the image information is photoelectrically converted and the image information is read as an electric signal. Hereinafter, the optical path from the light emitted from the light source to the original reflected on the white platen roller and incident on the line sensor is referred to as a sub-scanning line.

In positioning the positions of a light source and a line sensor along a predetermined sub-scanning line inside a contact image sensor, as described in Japanese Patent Application Laid-Open No. 5-75785, The light source is brought into contact with a reference portion of the sensor frame, which is a casing of the above, so that the relative position between the light source and the line sensor is aligned within a predetermined tolerance.

When a contact image sensor is mounted as a unit on an image reading apparatus, it is necessary to align a sub-scanning line of the contact image sensor with an external white platen roller. That is,
It is necessary to align the position of the line sensor in the contact image sensor with the white platen roller. For this reason, the dimensional tolerance of the mounting parts around the close contact image sensor is strict, the mounting position accuracy of the close contact image sensor is secured, and the close contact image sensor is accurately positioned on the white platen roller.

[0005]

However, as described above, if the dimensional tolerances of the mounting parts around the close contact image sensor are to be strict, the costs such as the parts processing cost of the mounting parts and the die cost will increase. There is something to do.

Further, when the dimensional tolerance of the mounting component cannot be ensured, there is a case where the image quality is inevitably divided.

Further, if there is a change in design specifications such as image reading timing, in order to secure the positioning accuracy of the contact image sensor, it is necessary to deflect the shape of the component or add a new component. There is also a case where the allowable margin is insufficient for the dimensional variation.

Further, when the contact image sensor is attached at an angle, there is a possibility that unstable behavior may occur during document conveyance or the like, and stable image reading may be hindered.

SUMMARY OF THE INVENTION An object of the present invention is to address the above-mentioned circumstances. By adjusting the position of the contact image sensor, the dimensional tolerance of the mounting parts around the contact image sensor is relaxed, and the parts and metal parts are adjusted. An object of the present invention is to provide an image reading apparatus that reduces costs such as mold costs.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a light emitted from a light source in a contact image sensor is radiated to a document on a white platen roller, and reflected light is reflected on the original. An image reading device that converges the image sensor as a line sensor in the contact image sensor, photoelectrically converts the image information as an electric signal, and includes a position adjusting unit that adjusts the position of the contact image sensor with respect to the white platen roller. It is characterized by the following.

According to the first aspect of the invention, by adjusting the position of the contact image sensor, the sub-scanning line of the contact image sensor can be easily and accurately aligned with the white platen roller. Therefore, the dimensional tolerance of the mounting parts around the contact image sensor can be relaxed, and the cost of parts and molds can be reduced.

According to a second aspect of the present invention, in the first aspect of the invention, the position adjusting means has a positioning spacer for supporting a sensor frame of the contact image sensor and adjusting a position of the contact image sensor. It is characterized by doing. .

According to the second aspect of the present invention, even when a general-purpose contact image sensor of a general-purpose type is used,
The position of the contact image sensor can be positioned with respect to the white platen roller along the sub-scanning line,
The position error of the sub-scanning line can be kept within a predetermined tolerance range.

According to a third aspect of the present invention, in the second aspect, the positioning spacer adjusts the position of the contact image sensor in a stepless manner.

According to the third aspect of the present invention, since the position of the contact image sensor is adjusted steplessly, it is possible to easily cope with a change in design specifications without changing parts, and to provide another configuration. It is possible to increase the allowable margin for the variation of the parts.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the positioning spacers are provided at both end portions of the sensor frame of the contact image sensor.

According to the fourth aspect of the present invention, even if the contact image sensor is inclined, adjustment can be made independently at both ends thereof, the inclination of the contact image sensor can be corrected, and the image sensor becomes unstable due to document conveyance or the like. And stable reading of an image can be performed.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image reading apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic sectional view of a facsimile provided with an image reading apparatus according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the facsimile shown in FIG.

This embodiment is an example in which an image reading apparatus provided with a mechanism for adjusting a contact image sensor is mounted on a facsimile. As shown in FIG. 1, the facsimile includes an image reading section 1 and a document separating section 2 as shown in FIG. , A document transport section 3, an image information recording section 4, a power supply section 5, a control section 6, and an operation section 7.

As shown in FIG. 2, the facsimile includes a panel 20 of the operation unit 7, a casing 21 of the main body,
It comprises a top cover 22, a sensor frame 8 for the contact image sensor 11, a sheet metal chassis 23, and a bottom cover 24.

Further, as shown in FIG.
Are a contact image sensor 11, a white platen roller 12, a pressure spring 13, and a sub-pressure spring 1.
4.

Further, as shown in FIGS. 3 and 4, brackets 9 and 10 are provided on both sides of the sensor frame 8 for the contact image sensor 11, and on both outer sides of the brackets 9 and 10, A pair of positioning spacers 18, 18 (position adjusting means) for adjusting and positioning the position of the contact image sensor 11 are arranged. By adjusting the positions of the mounting screws 18b, 18b along the elongated holes 18a formed in the positioning spacers 18, 18, the position of the contact image sensor 11 can be adjusted. In FIG. 4, A indicates the position of the sub-scanning line, B indicates the sub-scanning position, and C indicates the effective reading area.

Further, as shown in FIG. 5, a light source 11a and a line sensor 11b are accommodated in the contact image sensor 11, and the light emitted from the light source 11a is transmitted to a document on a white platen roller 12. (Not shown), the light reflected by the light is converged on the line sensor 11b, photoelectrically converted, and image information is read as an electric signal. The optical path from the light emitted from the light source 11a to the original (not shown) on the white platen roller 12 and incident on the line sensor 11b is a sub-scanning line.

The above-mentioned pressure spring 13 presses the contact image sensor 11 against the white platen roller 12 with a predetermined load in the direction of arrow 15 as shown in FIG. Pressure spring 1
4 is a protruding contact portion 25 formed on the sheet metal chassis 23.
The positioning spacer 18 is pressed in the direction of the arrow 16 with a predetermined load so as to contact the positioning spacer 18. In addition,
The pressure spring 13 and the sub-pressure spring 14 may be coil springs, but using a leaf spring is more advantageous in terms of space.

With this configuration, as shown in FIG. 5, when positioning the sub-scanning line of the contact image sensor 11 with respect to the white platen roller 12,
By adjusting the positions of the mounting screws 18b, 18b along the long holes 18a of the positioning spacers 18, 18, the sub-scanning line position of the contact image sensor 11 (that is, the position of the line sensor 11b) is adjusted. 1
1 is positioned with respect to the white platen roller 12. As described above, since the positioning can be performed easily and accurately, the dimensional tolerance of the mounting parts around the close contact image sensor 11 can be relaxed, and the cost of parts and molds can be reduced. The position error of the sub-scanning line is
It can be kept within a predetermined tolerance range. Further, since the position of the contact image sensor 11 is steplessly adjusted, it is possible to easily cope with a change in design specifications without changing parts, and to allow an allowable margin for variations in other components. Can be bigger. Further, as shown in FIGS. 3 and 4, two positioning spacers 18 are provided at both end portions of the contact image sensor 11, and two contact spacers corresponding to the two positioning spacers 18 are provided. Since the contact portions 25 and 25 are provided on the sheet metal chassis 23, even if the contact image sensor 11 is inclined, it can be adjusted independently at both ends thereof, the inclination of the contact image sensor 11 can be corrected, and the document is conveyed. Thus, stable reading of an image can be performed by preventing unstable behavior due to, for example, the above.

As shown in FIG. 6, the positioning spacer 18 is brought into close contact with the positioning spacer 18 such that the position at a predetermined distance H from the end face falls within a predetermined standard width W of the adjustment reference of the sub-scanning line. Attach to sensor 11,
At this time, the width P2 of the long hole 18a and the two mounting screws 18b,
The relationship with the interval P1 between 18b is P2> P1 + W,
The end face of the positioning spacer 18 is located substantially at a distance D from the frame reference plane of the contact image sensor 11. Furthermore, as shown in FIG. 7, when the adjustment reference of the sub-scanning line of the contact image sensor 11 is positioned with respect to the white platen roller 12, the adjustment reference of the sub-scanning line is a predetermined distance from the frame reference surface of the contact image sensor 11. Position adjustment is performed so as to enter the distance X. Predetermined distance X
About the setting of the product standard and the contact image sensor 11
It is set arbitrarily in consideration of the positional variation of the single line sensor 11b.

The present invention is not limited to the above-described embodiment, but can be variously modified.

[0029]

According to the first aspect of the present invention, by adjusting the position of the contact image sensor, the sub-scanning line of the contact image sensor can be easily and accurately aligned with the white platen roller. Can be.
Therefore, the dimensional tolerance of the mounting parts around the contact image sensor can be relaxed, and the cost of parts and molds can be reduced.

According to the second aspect of the present invention, even when a general-purpose general-purpose contact image sensor is used,
The position of the contact image sensor can be positioned with respect to the white platen roller along the sub-scanning line by the positioning spacer, and the position error of the sub-scanning line is as follows.
It can be kept within a predetermined tolerance range.

According to the third aspect of the present invention, since the position of the contact image sensor is adjusted steplessly, it is possible to easily cope with a change in the design specification without changing the parts, and to change the design specifications. It is possible to increase the allowable margin for the variation of the components.

According to the fourth aspect of the present invention, even if the contact image sensor is tilted, adjustment can be made independently at both ends thereof, the inclination of the contact image sensor can be corrected, and an error due to document conveyance or the like can be prevented. A stable image can be read while preventing a stable behavior.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a facsimile provided with an image reading device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the facsimile shown in FIG. 1;

FIG. 3 is an enlarged perspective view of a main part of the sheet metal chassis shown in FIG. 2;

FIG. 4 is a perspective view of a contact image sensor.

FIG. 5 is an enlarged cross-sectional view of the image reading unit shown in FIG.

FIG. 6 is a side view of the contact image sensor and the positioning spacer.

FIG. 7 is a schematic diagram of a contact image sensor and a positioning spacer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image reading part 8 Sensor frame 11 Contact image sensor 11a Light source 11b Line sensor 18 Positioning spacer 23 Sheet metal chassis 25 Contact part

Claims (4)

[Claims] A light emitted from a light source in a contact image sensor is applied to a document on a white platen roller, and light reflected on the document is converged on a line sensor in the contact image sensor, and photoelectrically converted to convert image information. An image reading apparatus for reading as an electric signal, comprising: a position adjusting unit for adjusting a position of the contact image sensor with respect to the white platen roller. 2. The positioning device according to claim 1, further comprising a positioning spacer for supporting a sensor frame of the contact image sensor and adjusting a position of the contact image sensor.
The image reading device according to claim 1. 3. The image reading apparatus according to claim 2, wherein the positioning spacer adjusts the position of the contact image sensor steplessly. 4. The image reading apparatus according to claim 3, wherein the positioning spacers are provided on both side ends of the sensor frame of the contact image sensor.