JPH04192660A - Veneer type color image reader - Google Patents

Abstract

PURPOSE:To allow the focusing to all color components in the same manner by changing the voltages to be impressed to piezo elements at every reading of the original images of the respective color components to move a solid-state image pickup element and placing respective photodetector to the image plane for each of the respective color components. CONSTITUTION:The piezo elements 1, 3 change the lengths thereof by the voltages to be impressed thereto and stretch along the optical axis 5 direction of an optical lens 4. Then, the planes 31 formed by the respective blue photodetector 40, green photodetector 42 and red photodetector 44 of CCDs 30 are moved to desired positions perpendicularly to an optical axis 5 and along the optical axis 5 by respectively changing the voltages to be impressed to the piezo elements 1, 3 and can be stopped. The voltages to be impressed to the piezo elements 1, 3 are controlled by a control circuit 50. The compact device is obtd. in this way and the deviations between the image planes of the respective color components and the respective photodetector are absorbed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a single-chip color image reading device such as a color scanner, and in particular, to a single-panel color image reading device such as a color scanner, and in particular, to a color filter having blue (B), green (G), and red (R) color filters. The present invention relates to a device equipped with a solid-state image sensor such as a COD.

[Conventional technology] FIG. 7 shows a conventional three-plate color image reading device.

A document image of light corresponding to the transmitted-illuminated color document 2 is formed by the optical lens 4, and the color separation prism 102, color filter 1041, . A color separation optical system such as 104G and 104R separates the BGR into each color component. Then, the document image of the color-separated light of each color component is received for each color component by light receiving sections (not shown) of CCDs 106a, 106G, and 106R as solid-state image sensors.

In the second three-plate color image reading device, CCD 106B
, 106G, and 106R are divided into three parts,
Each CCD 106g, 106G, 106R can be individually adjusted and fixed at a desired position along the optical axis 108B, 108G, 108R of each color component.
Therefore, even if the image plane for each color component formed by the original image is formed at a different position due to the chromatic aberration of the optical lens 4, each CCD 106. .

The light receiving parts of 106a and 106R are arranged at the image plane F for each color component.
It can be placed in BO+F GO+F RO. This allows all color components to be focused in the same way.

On the other hand, color solid-state imaging devices such as CCDs having BGR color filters have recently been developed. This CCD is the 6th
As shown in the figure.

In this CCD 30, a window is opened in the light shielding film 32, as shown in FIG. 6(1). A blue filter 34 that transmits blue component light, a green filter 36 that transmits green component light, and a red filter 38 that transmits red component light are formed in this window.

Below each color filter 34, 36, 38, a blue light receiving section 40, a green light receiving section 42, and a red light receiving section 44 are formed on the same plane. The light transmitted through the transparent cover 46 is separated into each color component by each color filter 34, 36, 38.

In the case of the CCD 30 which reads images as points, Fig. 6 (2)
As shown in FIG.
2 and one red light receiving section 44 are provided.

The CCD 30 that reads images as lines is shown in Figure 6 (3).
As shown in the figure, a plurality of blue light receiving sections 40, green light receiving sections 42, and red light receiving sections 44 are provided in three lines. In the CCD 30 that reads images as a surface, as shown in FIG. 6(4), a plurality of blue light receiving sections 40, green light receiving sections 42, and red light receiving sections 44 are provided alternately with a predetermined regularity. .

A conventional single-plate color image reading device equipped with this CCD 30 is shown in FIG. 8, and parts corresponding to those in FIG. 7 are given the same reference numerals.

An original image of light corresponding to the color original 2 that has been transmitted and illuminated is formed by an optical lens 4 . Color separation is performed using a blue filter 34, a green filter 36, and a red filter 3 of the CCD 30.
It will be held at 8. Image plane F of each color component formed in the original image
The plane 31 formed by the blue light receiving section 40, the green light receiving section 42, and the red light receiving section 44 is made to match. As a result, the blue light receiving section 40, the green light receiving section 42, and the red light receiving section 44 are placed on the image plane F. Then, the color-separated original image of light of each color component is received by the blue light receiving section 40, green light receiving section 42, and red light receiving section 44 of the CCD 30 for each color component.

In this way, when a color image reading device is configured using the CCD 30, each color is separated into each color component by each color filter 34, 36, 38, so the color separation prism 1 shown in FIG.
02, color filter 104. , 104G, 104R, etc. are not required separately. Also, one CCD
It only takes 30. Therefore, a very compact color image reading device can be realized.

[Problems to be Solved by the Invention] However, the conventional single-plate color image reading device using the CCD 30 has the following problems.

If the optical lens 4 has chromatic aberration, as shown in FIG.
An image plane FBO for the B color component and an image plane F for the G color component are located at different positions on the optical axis 5. 0 and an image plane FRO of the R color component. Therefore, if there is chromatic aberration, no matter where the CCD 30 is placed, each image plane F BOI F G
A misalignment occurred between the ot F RO and each of the light receiving sections 40, 42, and 44, and it was not possible to focus all the color components in the same way.

The present invention solves the above-mentioned technical problems, is compact,
Moreover, it is an object of the present invention to provide a single-plate color image reading device that can absorb the misalignment between the image plane of each color component and each light receiving section.

[Means for Solving the Problems] In order to solve the above-mentioned technical problems, the present invention has the following configuration.

That is, the single-plate color image reading device of claim (1) includes a blue filter that transmits blue component light, a green filter that transmits green component light, and a red filter that transmits red component light, and the same Equipped with a color solid-state image sensor formed on a flat surface and having a blue light receiving section, a green light receiving section, and a red light receiving section that receive light of each color component that has passed through blue, green, and red color filters, it can handle color originals. The image of the original is focused on the optical axis of an optical lens, and each light receiving section reads the original image for each color component.A piezo element is installed to move the color solid-state image sensor, and the original image of each color component is read. Single-chip color image reading according to claim 2, characterized in that during reading, the color solid-state image sensor is moved by changing the voltage applied to the piezo element, and each light receiving section is placed on an image plane for each color component. The device includes a blue filter that transmits blue component light, a green filter that transmits green component light, a red filter that transmits red component light, and blue, green, and red color filters that are formed on the same plane. Equipped with a color solid-state image sensor that has a blue light receiving section, a green light receiving section, and a red light receiving section that respectively receive the transmitted light of each color component, and the document image with light corresponding to the color document is placed on the optical axis of the optical lens. In a device that forms an image and reads the original image for each color component at each light receiving section, a piezo element is installed to move the color solid-state image sensor, and the voltage applied to the piezo element is changed each time the original image of each color component is read. Single-chip color image reading according to claim 3, characterized in that the color solid-state image sensor is moved and each light receiving section is placed on a displacement plane for each color component that is shifted by a predetermined distance from the image plane for each color component. The device is defined by the claim (
1) or (2) is characterized in that the plane formed by each light receiving section is tilted at a predetermined angle with respect to the image plane.

[In the single-panel color image reading device of claim (1),
Equipped with a color solid-state image sensor. This color solid-state image sensor is formed on the same plane as a blue filter that transmits blue component light, a green filter that transmits green component light, and a red filter that transmits red component light, and
It has a blue light receiving section, a green light receiving section, and a red light receiving section that respectively receive light of each color component transmitted through each color filter of blue, green, and red. A document image of light corresponding to a color document is formed on the optical axis of an optical lens, and each light receiving section reads the document image for each color component.

A piezo element for moving the color solid-state image sensor is also provided. Each time a document image of each color component is read, the voltage applied to the piezo element is changed to move the color solid-state image sensor. Each light receiving section is placed on the image plane for each color component.

Therefore, even if the optical lens has chromatic aberration, the misalignment between each image plane of each color component and each light receiving section of the color solid-state image sensor can be absorbed, and all color components can be focused in the same way. In addition, the color solid-state image sensor is equipped with a BGR color filter, so there is no need for a separate color separation prism or color filter.
A very compact color image reading device can be realized with only one color solid-state image sensor.

In the single-panel color image reading device according to claim (2),
Equipped with a color solid-state image sensor. This color solid-state image sensor is formed on the same plane as a blue filter that transmits blue component light, a green filter that transmits green component light, and a red filter that transmits red component light, and
It has a blue light receiving section, a green light receiving section, and a red light receiving section that respectively receive light of each color component transmitted through each color filter of blue, green, and red. A document image of light corresponding to a color document is formed on the optical axis of an optical lens, and each light receiving section reads the document image for each color component.

A piezo element is provided to move the color solid-state image sensor. Each time a document image of each color component is read, the voltage applied to the piezo element is changed to move the color solid-state image sensor. Each light receiving section is placed on a displacement plane that is displaced by a predetermined distance from the image plane for each color component.

Therefore, even if the optical lens has chromatic aberration, the deviation between each deviation plane of each color component and each light receiving part of the color solid-state image sensor can be absorbed, and the focus can be blurred in the same way for all color components. In addition, since the color solid-state image sensor is equipped with a BGR color filter, there is no need for color separation brism or a separate color filter.
A very compact color image reading device can be realized with only one color solid-state image sensor.

In the single-panel color image reading device according to claim (3),
In the device according to claim (1) or (2), the plane formed by each light receiving portion is inclined at a predetermined angle with respect to the image plane.

Therefore, while taking measures against flare, it is possible to absorb the deviation caused by tilting and the deviation between each image plane or each deviation plane and each light receiving part due to chromatic aberration, and it is possible to focus all color components in the same way. It is possible to shift the Furthermore, a very compact color image reading device can be realized.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing a single-plate color image reading device according to an embodiment of the present invention, FIG. 1 (1) is a front view thereof, and FIG. 1 (2) is a right side view thereof. Portions corresponding to conventional image reading devices are given the same reference numerals.

This single-chip color image reading device uses a CCD 30 (see Fig. 6 (3)) that reads images as lines as a solid-state image sensor.
) is used.

A color original 2 such as a film is placed on the transparent original table 24.
is placed. The light source 8 is powered with a constant voltage and current, and projects a constant amount of white light onto the color original 2 in a line shape. The light transmitted through the color original 2 is imaged by the optical lens 4. Note that the optical lens 4 has chromatic aberration. Therefore, the image plane F is formed by the original image of the B color component.

and an image plane F formed by the original image of the G color component. 0 and the image plane FRO formed by the R color component original image are located at different positions on the optical axis 5. Note that these image planes F s o
+ F a o + F RO is perpendicular to the optical axis 5 . The document mounting table 24 is rotated by the motor 20.
It is moved in the sub-scanning direction shown by arrow 2G. therefore,
The entire color document 2 will be scanned,
A document image of each BGR color component can be obtained.

One end of a piezo element 1.3 is attached to both ends of the back surface of the CCD 30, respectively. The other end of the piezo element 1.3 is fixed to a frame (not shown). The piezo element 1.3 changes its length depending on the applied voltage,
It extends along the optical axis 5 direction of the optical lens 4. Therefore, by changing the voltage applied to each piezo element 1.3, each blue light receiving section 40. The plane 31 formed by the green light receiving section 42 and the red light receiving section 44 is perpendicular to the optical axis 5 and along the optical axis 5,
It can be moved to a desired position and stopped.

The voltage applied to the piezo elements 1 and 3 is controlled by a control circuit 5°.

FIG. 2 is a specific circuit diagram of the control circuit 50.

The bus 52 includes a CPU 54, a ROM 56, a 5. / Kur,.

A block memory 58 and D/A converters 60 and 62 are connected. The lookup memory 58 stores in advance a lookup table 64 for just focus and a looka knob table 66 for out of focus.

In lookup table 64, address At.

A2 has piezo elements 1.3 when reading the original image of the B color component.
, and the plane 31 becomes the image plane F, respectively. Data D1 and D2 are stored respectively (see FIG. 1). Addresses A, , A4 store data D, , D, respectively, which extend the piezo elements 1.3 and make the plane 31 coincide with the image plane Fao when reading the original image of the G color component (the first (see figure).

At addresses A, , A, and l, when reading an image of the R color component, the piezo elements 1.3 are each extended to change the plane 31 to the image plane F.
Data D, , Ds matched with RO are stored respectively (see FIG. 1).

Also, in the lookup table 66, address A
v, Aa are piezo elements 1 when reading the original image of the B color component.
．． Data D that extends each of the planes 3 and 3 to match the plane 31 with the slip plane F II shifted by a predetermined distance from the image plane FBO.
7. D, is stored (see Figure 1). Address A
,,,A,. Data D11. is used to stretch the piezo elements 1.3 and align the plane 31 with the deviation plane FGI which is a predetermined distance from the image plane Fao when reading the original image of the G color component. DIO is stored (see Figure 1).

Adrek △1. , 4, and 2 include data D, 1°D12 for stretching the piezo elements 1 and 3 and aligning the plane 31 with the shifted plane F0 shifted by a predetermined distance from the image plane FRO when reading the original image of the R color component. is stored (see Figure 1). This lookup table 66 includes the color original 2
This is used when the area is formed of halftone dots, etc. This is because when you focus, the halftone dots are read and reproduced as they are. If the image is out of focus, the halftone dots will not be clearly reproduced, and a better original image will be obtained.

The ROM 56 stores in advance a just-focus mode program and a defocus mode program, either of which is called up according to an operator's instructions.

If just focus mode is specified, CP
U54 first specifies address A1 and sends data Di to D/A converter 60 according to the just focus mode program stored in ROM 56.
Data D2 is sent to the D/A converter 62 by specifying the address A2. The D/A converters 60.62 convert the sent data DI and D2 into analog voltages, and output the converted voltages to the piezo elements 1.3. Therefore, the piezo elements 1 and 3 are each stretched,
The plane 31 coincides with the image plane Fno (see FIG. 3(1)). As a result, the blue light receiving section 40 is directed to the image plane F. , and receives one line of the original image of the B color component that is in focus. Therefore, at this time, image reading is performed by the blue light receiving section 40.

Next, the CPU 54 sequentially specifies addresses Ai, A, and data D3. D, the D/A converter 60, 6
Send each to 2. Therefore, the piezo elements 1.3 each extend, and the plane 31 coincides with the image plane Fco (the third
(See Figure (2)). As a result, the green light receiving section 42
It is placed on the image plane FGo and receives one line of the original image of the focused B color component.

Therefore, at this time, image reading is performed by the blue light receiving section 40.

Next, the CPU 54 sequentially specifies the addresses As and Aa to send the data D, , D, to the D/A converters 60 and 6.
Send each to 2. Therefore, the piezo elements 1.3 are each extended, and the plane 31 coincides with the image plane FIIO (see FIG. 3(3)). As a result, the red light receiving section 44 is placed on the image plane FRO and receives one line of the original image of the focused R color component.

Therefore, at this time, the red light receiving section 44 performs image reading.

Next, the motor 20 is driven to move the color original 2 by one line in the sub-operation direction 26, and the above-described operation is performed. This line sequential process of reading the document image for each color component of BGR one line at a time is repeated.

Therefore, the entire color document 2 is scanned, and a document image in which each BGR color component is in focus can be read for the entire color document 2.

In this embodiment, the CCD 30 is moved by the piezo elements 1 and 3, and each light receiving part 40, 42, 44 is moved to each image plane FIO+F.
I try to place each in Got F RO.

Therefore, even when there is monochromatic aberration, each image plane F,
. .

It is possible to absorb the misalignment between the FGot F RO and each of the light receiving sections 40, 42, and 44, and it is possible to focus all the color components in the same way. The CCD 30 is also provided with BGR color filters 34, 36, and 38 (see FIG. 6(1)). Therefore, a color separation prism or a color filter is not separately required, and a very compact color image reading device can be realized with a single C0D30 test.

Next, the blur mode will be explained. If the out-of-focus mode is instructed, the CPU 54
According to the program stored in M56, first address A, , A is specified and data D, , D,
is sent to the D/A converter 60.62. Therefore, the piezo elements 1 and 3 are each stretched, and the plane 31 is shifted from the plane F.
It coincides with Il+ (see Figure 3 (4)). As a result, the blue light receiving section 40 is placed on the shifted plane FB□ and receives one line of the original image of the B color component which is out of focus. Therefore, at this time, image reading is performed by the blue light receiving section 40.

Thereafter, in the same manner, the CCD 30 is placed on the shifted plane FGI, and the green light receiving section 42 receives light (see Fig. 3 (5).
), furthermore, the CCD 30 is placed on the grazing plane F II+, and the red light receiving section 44 receives light (see the third
(See Figure (6)).

In this way, the operation of reading the document image line-by-line is repeated.

In this embodiment, the CCD 30 is moved by the piezo element 1.3 so that each light receiving section 40, 42, 44 is placed on each shift plane F, 1°F GI+F R1. Therefore, even when there is chromatic aberration, each displacement plane F i
ll+F Gl+ F R1 and each light receiving section 40.42
．． 44 deviations can be absorbed, and all color components can be shifted in focus in the same way. Furthermore, a very compact color image reading device can be realized.

Note that in this embodiment, a CCD that reads images as lines is used.
30, but it was also implemented using a CCD 30 that reads images as points (see Figure 6 (2)) and a CCD 30 that reads images as a surface (see Figure 6 (4)). It's okay.

FIG. 4 is a diagram showing a single-plate color image reading device according to another embodiment of the present invention, and parts corresponding to those in the embodiment of FIG. 1 are given the same reference numerals.

In this embodiment, measures against flare light are taken.

Here, flare means that incident light corresponding to the highlight part of an image is reflected back and forth between the light receiving part of the solid-state image sensor and an optical system such as an optical lens, and a black image in the vicinity is read. This is when reflected light enters the light receiving section of the Therefore, it is not possible to obtain an image with clear outlines due to the flare light.

The plane 31 of the CCD 30 that reads the image as a line is the image plane F.
When tilted at a predetermined angle with respect to Mol F Got F RO, no round trip reflection occurs and each light receiving section 40.
42 and 44 will not receive reflected light, and flare countermeasures can be taken. However, if you tilt it at a certain angle,
Each light receiving section 40, 42, 44 is shifted from each image plane. Therefore, it is necessary to absorb the shift caused by tilting.

One end of a piezo element 1.3 is attached to both side ends of the CCD 30, respectively. The other end of the piezo element 1.3 is fixed to the frame. The piezo element 1.3 extends along the optical axis 5 of the optical lens 4 at a predetermined angle due to the applied voltage. Therefore, by changing the voltages applied to the piezo elements 1 and 3, each blue light receiving section 40 and green light receiving section 4 of the CCD 30 can be
2 and a plane 31 formed by the red light receiving section 44
can be moved to a desired position at a predetermined angle to the optical axis 5 and stopped.

If just focus mode is specified, CP
According to the just focus mode program stored in the ROM 56, U54 first selects addresses A, , A.
2 and sends data D1 and D2 to the D/A converters 60 and 62. Therefore, the piezo elements 1 and 3 are each extended, and the blue light receiving section 40 is placed on the image plane FBO. As a result, the blue light receiving section 40 receives one line of the original image of the focused B color component. Therefore, at this time, the blue light receiving section 40 performs image reading.

Thereafter, in the same manner, the green light receiving section 42 is located at the image plane F. .

Further, the red light receiving section 44 is placed on the image plane FRO, and the red light receiving section 44 receives light.

Next, the blur mode will be explained. When the blur mode is instructed, the CPU 54 reads the ROM 5.
According to the program stored in 6, address A? , A s and data Dv, D
s to the D/A converter 60.62. Therefore, the piezo elements 1 and 3 are each extended, and the blue light receiving section 40 is placed on the shifted plane FBI. As a result, the blue light receiving section 40 receives one line of the original image of the B color component which is out of focus. Therefore, at this time, image reading is performed by the blue light receiving section 40.

Thereafter, in the same manner, the green light receiving section 42 is shifted to the plane FGI.
The red light receiving section 44 is placed on the grazing plane FR1, and the red light receiving section 44 receives light.

In this way, the operation of reading the document image line-by-line is repeated.

In each of the above embodiments, the plane 31 is defined as each image plane F,...F00
rF While tilting at a predetermined angle with respect to RO, the CCD 30 is moved using the piezo elements 1 and 3, and each light receiving section 40.
゜44 for each image plane F lio + F co + F R
O or each shift plane FG1. I try to place it on FB□+F11. Therefore, it is possible to absorb deviations caused by tilting and chromatic aberration while taking measures against flare.

In this embodiment, the CCD 30 that reads images as lines is used to carry out the process, but the process may also be carried out using a CCD 30 that reads images as points (see FIG. 6 (2)). In addition, as shown in FIG.
Connect the CCD 30 and one end of the piezo element 1°3 to the plane 31.
is mounted so that it is tilted at a predetermined angle with respect to the image plane FBO + FGO + FRO, and the piezo elements 1 and 3 are aligned with the optical axis 5.
It may be made to stretch in the direction. Further, the optical lens 4 has no chromatic aberration, and each image plane F,. +FGO+FR
Even when O is the same, measures against flare light can be taken.

Note that in the above embodiment, the process was performed line-sequentially, but
Instead of line-sequential reading, the entire document image may be read in plane-sequential manner, in which each BGR color component is read.

Also, I tried to implement it using two piezo elements, but
It may be implemented using one piezo element or a plurality of three or more piezo elements.

Further, although the CCD is used as the color solid-state image sensor, other color solid-state image sensors such as RO3 may be used.

Further, the distance between the image plane F lo+F Got Flo and the deviation plane Fl11+F6□, FRI may be selected from various values.

Furthermore, although it has been made possible to select either one of the just-focus mode and blur mode, it is also possible to have only one of them.

Although the CCD 30 is shown to be located outside the BGR image plane and the deviation plane in FIG. 1.4.5 for convenience of explanation, it is actually located within the range of the BGR image plane and the deviation plane. The CCD 30 is finely driven within the range by a piezo element. Moreover, a preferable position is the FGo plane.

[Effect of the invention] In the single-panel color image reading device of claim (1),
A color solid-state image sensor having a BGR color filter is provided, and a piezo element for moving the color solid-state image sensor is provided,
Each time an original image of each color component is read, the voltage applied to the piezo element is changed to move the color solid-state image sensor so that each light receiving section is placed on the image plane for each color component.

Therefore, even if the optical lens has chromatic aberration, the misalignment between each image plane of each color component and each light receiving section of the color solid-state image sensor can be absorbed, and all color components can be focused in the same way. In addition, since the color solid-state image sensor is equipped with a BGR color filter, there is no need for a separate color separation prism or color filter;
Only one color solid-state image sensor is required, and an extremely compact color image reading device can be realized.

In the single-panel color image reading device according to claim (2),
It is equipped with a color solid-state image sensor having a BGR color filter, and a Vieri element for moving the color solid-state image sensor. The solid-state image sensor is moved 1, and each light receiving section is placed on a shifted plane that is shifted a predetermined distance from the image plane for each color component.

(7) Therefore, even if the optical lens has chromatic aberration, it is possible to absorb the deviation between each deviation plane of each color component and each light receiving part of the color solid-state image sensor, and it is possible to blur the focus in the same way for each color component. Furthermore, since the color solid-state image sensor is equipped with a BGR color filter, there is no need for a separate color separation prism or color filter, and only one color solid-state image sensor is required, resulting in a very compact color image. A reading device can be realized.

In the single-panel color image reading device according to claim (3),
In the device according to claim (1) or (2), the plane formed by each light receiving portion is inclined at a predetermined angle with respect to the image plane.

Therefore, while taking measures against flare, it is possible to absorb the blur caused by tilting and the misalignment between each image plane or each misalignment plane and each light receiving part due to chromatic aberration, so that all color components can be focused in the same way, or , the focus can be shifted. Furthermore, a very compact color image reading device can be realized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a single-chip color image reading device according to an embodiment of the present invention, FIG. 2 is a specific circuit diagram of the control circuit 50, FIG. 3 is a diagram showing the operation, and FIG. 4 is a diagram showing the invention. FIG. 5 is a diagram showing a single-chip color image reading device according to another embodiment of the present invention, FIG. 6 is a diagram showing a CCD 30, and FIG. 8 is a diagram showing a conventional three-panel type color image reading device, and FIG. 8 is a diagram showing a conventional single-panel type color image reading device. 1.3...Piezo element 4...Optical l/lens...Optical axis 30...CCl':) 3J...Plane 34...Blue filter 36...Green filter 38...Red Filter 40... Blue light receiving section 42... Green light receiving section 44... Red light receiving section Fig+ F Got F RO"' Image plane F Ill,
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Claims (3)

[Claims] (1) A blue filter that transmits blue component light, a green filter that transmits green component light, a red filter that transmits red component light, and blue, green, and red color filters that are formed on the same plane. Equipped with a color solid-state image sensor that has a blue light receiving section, a green light receiving section, and a red light receiving section that respectively receive the transmitted light of each color component, and the document image with light corresponding to the color document is placed on the optical axis of the optical lens. In a single-chip color image reading device that forms an image and reads the document image for each color component at each light receiving section, a piezo element is installed to move the color solid-state image sensor, and a voltage is applied to the piezo element each time the document image of each color component is read. A single-chip color image reading device characterized in that a color solid-state image sensor is moved by changing voltage, and each light receiving section is placed on an image plane for each color component. (2) A blue filter that transmits blue component light, a green filter that transmits green component light, and a red filter that transmits red component light, as well as blue, green, and red color filters that are formed on the same plane. Equipped with a color solid-state image sensor that has a blue light receiving section, a green light receiving section, and a red light receiving section that respectively receive the transmitted light of each color component, and the document image with light corresponding to the color document is placed on the optical axis of the optical lens. In a single-chip color image reading device that forms an image and reads the document image for each color component at each light receiving section, a piezo element is installed to move the color solid-state image sensor, and a voltage is applied to the piezo element each time the document image of each color component is read. A single-chip color image reading device characterized in that a color solid-state image sensor is moved by changing a voltage, and each light receiving part is placed on a displacement plane for each color component that is shifted by a predetermined distance from an image plane for each color component. . (3) The single-plate color image reading device according to claim (1) or (2), characterized in that the plane formed by each light-receiving section is tilted at a predetermined angle with respect to the image plane. Device.