JPH10173867A - Image reading device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a dynamic range and a video rate, to increase the balck/ white reading speed and to improve the picture quality in a color reading mode by placing plural dot sequential CCD sensors in parallel to each other in the vertical scanning direction and adding together various color signals. SOLUTION: The photosensitive pixel strings 1 and 2 have the dot sequential types which include the photosensitive pixels consisting of the photoelectric conversion means and the color filters provided on those pixels by on-chip or bonding. The vertical transfer gates 3 to 6 are placed at both sides of the strings 1 and 2 respectively and select the electric charge of RGB colors to transfer them to the registers 7 to 13. A memory register 7 stores the electric charge of RG colors by an amount equal to two lines and vertically transfers the electric charge to the CCD registers 9 and 10 after delaying the charge. A memory register 8 stores the electric charge of a B color by an amount equal to two lines and transfers the electric charge to a CCD register 11 after delaying the charge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus including a light source for illuminating a document, an image forming lens, and a solid-state imaging device for performing photoelectric conversion.

[0002]

2. Description of the Related Art FIG. 9 is a diagram showing a schematic configuration of an image reading device using a reduced CCD sensor, and FIG. 10 is a schematic configuration of an image reading device using a three-line CCD sensor. FIG. 11 shows a dot sequential CCD.
FIG. 2 is a diagram illustrating a schematic configuration of an image reading apparatus using a sensor. In an image reading apparatus using a reduction type CCD sensor, as shown in FIG. 52, scanning is performed by the second and third reflecting mirrors 53 of the half-rate mirror, and the image is read by being reduced-projected onto the reduction-type CCD sensor 55 through the imaging lens 54. In such an image reading apparatus, for example, the pixel pitch of the sensor is 14 μm, and the document reading resolution is 16 dots / m.
m, the projection magnification of the lens is 0.224 times (= 0.014 ×
16). Since the conventional three-line CCD sensor has the R, G, and B photosensitive pixel rows arranged in parallel, different positions on the document surface are read as shown in FIG. 9B. Become. Therefore, assuming that the interval between the photosensitive pixel rows of the sensor is 168 μm, a different position shifted by 0.75 mm (= 0.168 / 0.224) on the document surface is read.

In the scanning by the full-rate mirror 52 and the half-rate mirror 53, since the lens 54 / sensor 55 system is scanned relative to the read original at a constant speed, information at different positions on the original surface can be obtained. Are read by the three-line CCD sensor 55 as data at different reading times. Therefore, the registration correction can be performed by applying a line-by-line delay to the sensor output using the line FIFO in the color registration correction memory.

As a conventional solid-state imaging device for reading a color original, a device in which a color filter is on-chip or bonded to photosensitive pixels of a CCD or MOS sensor is often used. Especially at present, as shown in FIG.
Are arranged in parallel in the sub-scanning direction (line-sequentially) in the sub-scanning direction, and two C pixels sandwiching the vertical transfer shift gates 62B, 62G, 62R on both sides for one color.
The mainstream is a three-line type CCD sensor having CD registers 63B, 63G, and 63R, which is driven in parallel and has high speed. In this parallel driving, the vertical transfer pulse generation circuit 69 causes the vertical transfer shift gates 62B, 62G, 62
R is controlled to divide the charges into even-numbered pixels and odd-numbered pixels, respectively, so that the two CCD registers 63B, 63G, 63R on both sides are separated.
After the vertical transfer, the horizontal transfer pulse generation circuit 68 controls the two CCD registers 63B, 63G, and 63R to perform horizontal transfer, thereby reading out the respective charges in series. Then, output amplifiers 64B, 64G, 6
4R, the signals of two columns for each color are synthesized by the multiplexers 65B, 65G, 65R, and the A / D conversion circuit 66 for each color.
A / D conversion is performed at B, 66G, and 66R, and image data of, for example, 256 gradations of 8 bits is taken into the image processing unit 67.

However, in this type, an electric circuit for correcting a gap in the sub-scanning direction is indispensable, and an extra memory cost is required. In a copying machine or a flatbed type scanner, mechanical scanning is performed in the sub-scanning direction. In addition, image factors such as color misalignment are likely to occur due to external factors such as vibrations. When changing the scanning speed in 1% increments in reduced-size copying, there are many points where the gap amount of the CCD does not seem to be an integer. However, since the color to be interpolated is blurred by the low-pass effect at this time, a difference occurs in the MTF between the three colors, which also causes a defect in image quality such as color misregistration.

Therefore, attention has been paid to a dot-sequential CCD sensor in which RGB are repeatedly arranged in the main scanning direction as shown in FIG. This type uses the photosensitive pixel row 7
Since 1 is one row, the above-described problem does not occur.
However, on the other hand, there is a problem that high-speed reading is difficult. That is, the pixel size of one color is simply reduced to about 1/3 of that of the three-line type, and the signal output is reduced. Therefore, it is necessary to lengthen the reading cycle in order to secure the dynamic range. 3 CCs each
It is difficult to arrange a total of six CCD registers, two for each color, on each side of the pixel column, such as a three-line CCD sensor, so that the D registers 73B, 73G, 73R are distributed on both sides of the photosensitive pixel column 71. It is difficult to increase the video rate with two parallel outputs per color, and so on.

The above-mentioned three-line type CCD sensor, dot-sequential type C
Japanese Patent Application Laid-Open No. 7-4 / 1993 discloses a supplement to the advantages and disadvantages of a CD sensor.
No. 6371 discloses a CCD sensor of a three line-point sequential switching type. However, this type of CCD sensor is actually a two-line type CCD sensor having a gap because only the combination of G and R is dot-sequential and B is another line. Is not avoided at all, and the CCD register has a structure of only one color, which is not preferable because the above problem is not avoided.

In recent years, while OA devices such as copiers, scanners, and printers have become more colorized, there is a growing need for black and white because of their inexpensiveness. In this case, a black-and-white document is read at a high speed, and a color document is read with a focus on image quality at least slightly later, and the CCD sensor must be of a color type. Therefore, when reading in black and white, one color (usually G)
Except for the above, multi-color signals become unnecessary, and the extra CCD registers that are not used for the other two colors cannot be used.
There are also problems such as the video rate not increasing.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a dot sequential C type having excellent image quality and cost.
The objective of the present invention is to improve the dynamic range and the video rate without deteriorating the advantages of the CD sensor, and to achieve both high speed in black-and-white reading and high image quality in color reading.

For this purpose, the present invention provides a plurality of sets of a plurality of colors arranged in parallel in the sub-scanning direction for selectively passing an optical image of a document for each color component, with a plurality of sets being arranged as one set in the main scanning direction. A filter and a plurality of photoelectric conversion elements are arranged in a main scanning direction corresponding to respective colors of the plurality of color filters, and are arranged in a plurality of sub-scanning directions for receiving an optical image passing through the color filter and converting the optical image into an electric signal. And a signal synthesizing unit for synthesizing a set of electric signals of the same color component at the same position in the sub-scanning direction among the electric signals of the plurality of photoelectric conversion units. The plurality of color filters are characterized in that a phase of a set of a plurality of colors in the arrangement order is shifted in the main scanning direction.

In a document reading apparatus including a light source for illuminating a document, an imaging lens, and a solid-state image pickup device for performing photoelectric conversion, m (m ≧ 2) pixels are mainly used for n pixels (n ≧ 2) as one pixel. A first photosensitive pixel row and a second photosensitive pixel row having a color filter arranged in the scanning direction and a solid-state imaging device corresponding to n pixels and m pixels of the color filter and arranged in parallel in the sub-scanning direction. A vertical transfer shift gate group arranged for each pixel independently for each color on both sides in the sub-scanning direction of the two photosensitive pixel columns, and each of the two photosensitive pixel columns. A plurality of CCD register groups disposed on both sides in the sub-scanning direction with the vertical transfer shift gate group interposed therebetween; and a plurality of memory register groups disposed between the first photosensitive pixel column and the CCD registers on both sides. Be prepared It is characterized in that the.

Further, the vertical transfer shift gate group includes:
It is connected to control drive lines for n colors, and is configured to perform control independently for each color. At the time of reading a color original, a charge of one color common to the two photosensitive pixel rows is applied to the inner C pixels.
By controlling the transfer to the CD register, the charge of one common color is added, and the control is performed such that the charges of all the colors are transferred to the CCD register inside the two photosensitive pixel rows when reading a monochrome document. By doing so, the charges of all colors are added, and the plurality of CCD register groups are arranged for the respective photosensitive pixel columns outside the two photosensitive pixel columns, and between the two photosensitive pixel columns. When the pitch between the first photosensitive pixel row and the second photosensitive pixel row is set to p lines, the memory register group is located outside the first photosensitive pixel row and the outside. P × 2 lines are arranged between the CCD register row and p lines are arranged between the first photosensitive pixel row and the second photosensitive pixel row, and the color of the first photosensitive pixel row is arranged. Of the color of the second photosensitive pixel row It is characterized in that it has staggered beauty order phase.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an image reading apparatus according to the present invention.
2 to 6 are vertical transfer shift gates, 7 and 8 are memory registers, 9 to 13 are CCD registers, 14 and 15 are adders, 16 to 18 are output amplifiers, 19 to 21 are A / D converters, and 22 is An image processing unit, 23 indicates a horizontal transfer pulse generation circuit, and 24 indicates a vertical transfer pulse generation circuit.

In FIG. 1, photosensitive pixel rows 1 and 2 are dot-sequential type photosensitive pixel rows each having a photosensitive pixel composed of photoelectric conversion means and an on-chip or bonded color filter thereon. The pixel row 1 is arranged in parallel with the photosensitive pixel row 2 so as to precede the sub-scanning direction by a gap of p (for example, 2) lines. The filter arranges a plurality of pixels m (m ≧ 2) in the main scanning direction in a dot-sequential manner in a main scanning direction with a plurality of colors n (n ≧ 2), for example, three colors of RGB as one set of pixels. It is selectively passed every time. The photoelectric conversion means receives the optical image passed by the filter and converts it into an electric signal. Hereinafter, three of the plurality of colors n, B is the first color,
A description will be given based on an example in which the second color is G, the third color is R, and the gap (pitch) p between the photosensitive pixel rows 1 and 2 is two lines.

The vertical transfer shift gates 3 to 6 are gates disposed on both sides of the photosensitive pixel columns 1 and 2 for selecting charges of each color of RGB and transferring them to each of the registers 7 to 13. Is generated by the vertical transfer pulse generation circuit 24. The memory registers 7 and 8 accumulate charges transferred from the photosensitive pixel column 1 through the vertical transfer shift gates 3 and 4 to correct a two-line gap between the photosensitive pixel columns 1 and 2 arranged in parallel. The memory register 7 is set to RG2
After accumulating two lines of color electric charges and delaying them, they are vertically transferred to the CCD registers 9 and 10, respectively. The memory register 8 accumulates two lines of B1 electric charges and delays them. Transfer to

The above-mentioned mode is a color mode. In the black-and-white mode, in contrast to the color mode, charges of all colors are transferred from the photosensitive pixel row 1 through the vertical transfer shift gate 4 to the memory register 8 and added. . As described above, the memory register 7 stores the photosensitive pixel row 1 and the photosensitive pixel row 2
When the pitch between them is p lines, the charge for p × 2 lines is accumulated between the photosensitive pixel row 1 and the outer CCD registers 9 and 10, and the memory register 8
The charge for p lines is accumulated between the photosensitive pixel row 1 and the photosensitive pixel row 2.

The CCD register 9 has R, CCD of the third color.
The G color of the second color is vertically transferred to the register 10 with a delay of two lines by passing through the memory register 7 from the photosensitive pixel row 1 respectively.
These charges are added to the second color adder 14 and the third color adder 1
5 is transferred horizontally. Similarly, charges of the second color G are transferred to the CCD register 12 and charges of the third color R are transferred to the CCD register 13 from the photosensitive pixel row 2 vertically.
13 horizontally transfers these charges to an adder 14 for the second color and an adder 15 for the third color. On the other hand, the CCD register 11
Is transferred vertically from the photosensitive pixel column 1 through the memory register 8 by a delay of two lines, and is simultaneously transferred vertically from the photosensitive pixel column 2 without delay. The B charges of both 1 and 2 are added. The CCD register 11 horizontally transfers this charge to the output amplifier 17 for the first color.

The above-described mode is a color mode. In the black-and-white mode, the charges of all the colors of the photosensitive pixel rows 1 and 2 are vertically transferred to the CCD register 11 and added. Reference numeral 11 horizontally transfers the charge to the output amplifier 17 for the first color as a black-and-white mode image signal. The horizontal transfer pulse generating circuit 23 generates transfer pulses for controlling these horizontal transfers.
It is.

Next, the basic operation of transferring charges from the photosensitive pixel row to the vertical transfer shift gate, the memory register, and the CCD register will be described. FIG. 2 is a diagram showing a cross section taken along line X2-X2 'in the CCD sensor shown in FIG.
As shown in FIG. 7, a memory register and a CCD register each formed of an N ^- doped layer are formed on a P layer formed on an N-type substrate. And the transfer of charge between these is
The charge transfer source is turned off and the charge transfer destination is turned on. The dotted line shows the potential state when the charge is on, and the solid line shows the potential state when the charge is off. For example, in FIG. 2, the charge of R in the photosensitive pixel row 1 is transferred to ST4 → ST6 → CCD register 9 of the memory register 7, and the charge of G is transferred to ST3 → ST5 → CCD register 10 of the memory register 7. Is done.

In order to transfer the charge of R in the photosensitive pixel row 1 to ST4 of the memory register 7, first, R of the vertical transfer shift gate 3 and ST3 of the memory register 7 are transferred.
Is turned on to transfer from the photosensitive pixel row 1 to ST3 of the memory register 7, and then ST3 is turned off and ST4 is turned on at the same time to turn on ST4 from ST3.
Transfer to When the charge of G in the photosensitive pixel row 1 is to be transferred to ST3 of the memory register 7, the G and ST3 of the vertical transfer shift gate 3 are turned on so that ST3 of the memory register 7 can be transferred from the photosensitive pixel row 1. Transfer to

Next, the operation in each of the color mode and the monochrome mode will be described. FIG. 3 is a diagram for explaining a charge transfer operation in each step in the color mode, FIG. 4 is a diagram for explaining a charge transfer operation in each step in the black and white mode, and FIG. FIG. 6 is a timing chart for explaining the operation in the mode, and FIG. 6 is a diagram showing a comparative example of the spectral energy of each color. First, in the case of the color mode, FIGS.
As shown in (A), a correction operation of a two-line gap between the photosensitive pixel rows 1 and 2 is performed in steps t0 to t4. At this time, since the photosensitive pixel rows 1 and 2 read information of different places, that is, the photosensitive pixel row 2 reads information two lines before the photosensitive pixel row 1, the preceding photosensitive pixel row 1 reads the information of the photosensitive pixel row 1. The charge at the time of reading the information at the same location as column 2 has already been transferred two lines earlier. For example, the B charge is ST2 of the memory register 8, the G charge is ST5 of the memory register 7, and the R charge is ST6 of the memory register 7.
Has been transferred to each.

Then, in step t1, by turning off ST2 of the memory register 8 and ST6 of the memory register 7, the charge of R of the photosensitive pixel row 1 is transferred to the CCD register 9 and the charge of B of the photosensitive pixel row 1 is stored. Charge the CCD register 1
Transfer to 1. In step t2, ST5 of the memory register 7 is turned off, and ST6 is turned on once and turned off again, whereby the G charges of the photosensitive pixel row 1 are transferred from the ST5 to ST6 to the CCD register 10. In steps t3 to t4, the charge one line before the photosensitive pixel column 1 is shifted. That is, photosensitive pixel row 1
From the ST4 to ST6 of the memory register 7.
Similarly, the charge of G is shifted from ST3 to ST5 of the memory register 7, and the charge of B is shifted from ST1 to ST2 of the memory register 8.

When the charge accumulation in the photosensitive pixel rows 1 and 2 is completed during the processing up to that time, the R of the transfer shift gates 3 and 6 (SH2G / R) is turned on in step t5, whereby the photosensitive pixel row 1 is turned on. R in the memory register 7
The charge of R of the photosensitive pixel row 2 is transferred to the CCD register 13 at T4.
To be transferred to At the same time, by turning on B of the vertical transfer shift gate 5 (SH1B / G / R) inside the photosensitive pixel row 2, the charge of B on the photosensitive pixel row 2 is transferred to the CCD register 1.
Transfer to 1. As a result, the CCD register 11 adds the charge of B of the photosensitive pixel row 1 transferred at step t1 to a simple double signal.

At step t6, the G of the outer transfer shift gates 3, 6 (SH2G / R) is turned on, so that the G charges of the photosensitive pixel row 1 are transferred to the S of the memory register 7.
The charge of G of the photosensitive pixel row 2 is transferred to the CCD register 12 to T3.
To be transferred to Then, by operating the main transfer clocks φ1 and φ2 from step t7, the charges of B are output after addition, and the charges of G and R are divided 4 before addition.
Retrieved on output. These are added to G by the adder 14 at the subsequent stage.
The electric charge of R is added to the electric charge of R by the adder 15 and output as a double signal.

In this case, as compared with the conventional apparatus, the spectral energy is 1 for B, 3 for G, and 2 for R in each photosensitive pixel row as shown in FIG. Is 1, while adding the charges of the photosensitive pixel rows 1 and 2, the doubled B is 2, G is 6, R
Becomes 4, and high-quality image reading can be realized at a high S / N with a wide dynamic range.

In the case of the black and white mode, the line correction between the photosensitive pixel rows 1 and 2 is performed by the memory register 8 through the inner vertical transfer shift gates 4 and 5 and transferred to the CCD register 11 so that each color is A signal obtained by adding all the charges is output. That is, as shown in FIG. 4 and FIG. 5B, the correction operation of the two-line gap is performed in steps t0 to t2. At this time, as in the case of the color mode,
In the photosensitive pixel rows 1 and 2, information of a different place is read, that is, the photosensitive pixel row 2 reads information two lines before the photosensitive pixel row 1, so that the preceding photosensitive pixel row 1 and the photosensitive pixel row 2 The charge at the time of reading the information at the same location has already been transferred two lines earlier. Therefore, of the charges of the photosensitive pixel column 1, charges that are two lines ahead are transferred to ST2 of the memory register 8, and charges that are one line ahead are transferred to ST1 of the memory register 8.

First, at step t1, by turning off ST2 of the memory register 8, the B / W (black and white) charge obtained by adding the BGR charge of the photosensitive pixel array 1 is transferred to the CCD.
Transfer to register 11. At step t2, by turning on ST2 and turning off ST1 of the memory register 8, the charge of ST1 of the memory register 8 is transferred to ST2. When the charge accumulation in the photosensitive pixel columns 1 and 2 is completed during the processing up to that time, in step t3, all of the inner transfer shift gates 4 and 5 (SH1B / G / R) are turned on, and the photosensitive pixels are turned on. All of the charges of each color in column 1 are transferred to ST1 of the memory register 8, and all of the charges of each color in photosensitive pixel column 2 are transferred to the CCD register 11. At this time, in the CCD register 11, all the charges of each color of the photosensitive pixel row 2 are added to the B / W (black and white) charge obtained by adding the BGR charge of the photosensitive pixel row 1 two lines ahead. Then, by operating the main transfer clocks φ1 and φ2 from step t4, all the charges are taken out of the output amplifier 17 as B / W charges after adding all the charges. In this case, as compared with the conventional device, the video output is 1, and the signal output adds each color as shown in FIG. 6C with respect to the conventional 3 shown in FIG. 6B. At the same time, since the photosensitive pixel rows 1 and 2 are further added, the signal amount becomes 12 and a signal amount four times as large as that of the related art can be obtained. Therefore, high-quality image reading at a high S / N with a wide dynamic range can be realized.

FIG. 7 is a diagram showing another embodiment of the image reading apparatus according to the present invention, and FIG. 8 is a diagram for explaining an example of a composite signal of each color when the embodiment shown in FIG. 7 is adopted. .

In the embodiment shown in FIG. 7, the arrangement of the colors of the photosensitive pixel row 2 'is shifted from the photosensitive pixel row 1 in phase. For example, assuming that the first color is B, the second color is G, and the third color is R, the arrangement order of the colors of the photosensitive pixel row 1 is the same as the embodiment of FIG. , The second color G and the third color R are arranged, while the arrangement order of the colors of the photosensitive pixel row 2 ′ is arranged as the third color R, the first color B and the second color G. That is, the order of arrangement of the color of the photosensitive pixel row 1 is BGRBG.
When R ..., the color arrangement order of the photosensitive pixel row 2 'is RB
GRBG... Or GRBGGRB. That is, when viewed in a cross section in the sub-scanning direction, the colors of the photosensitive pixel rows 1 and 2 'are made different.

In the dot sequential CCD sensor, as described in the prior art, the resolution of each color pixel in the main scanning direction is fine, and there is a shift of 1/3 cycle, so that color moire may occur. . The moiré is usually cut by an optical low-pass filter or the like to avoid the problem. However, in the above-described embodiment, as shown in FIG.
At 2 ', pixels of the same color read different places in the main scanning direction and add them, so that the reading width is 1/3 to 2/3.
Averaged. Therefore, the same effect as that of the low-pass filter can be obtained in the main scanning direction by the integration effect, so that there is a merit that an optical low-pass filter becomes unnecessary.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, two photosensitive pixel columns are arranged in parallel. However, three photosensitive pixel columns may be arranged in parallel, and further, they may be arranged with their phases in the order of their colors shifted. Also,
The memory register may be omitted, and the signal of each photosensitive pixel row may be fetched into the image processing unit, where the gap line may be corrected using the FIFO. In this case, since the line correction is performed by the image processing unit, the interpolation processing according to the enlargement / reduction ratio can be performed similarly to the conventional three-line type CCD sensor.

[0032]

As is apparent from the above description, according to the present invention, a plurality of dot-sequential CCD sensors are arranged in parallel in the sub-scanning direction, and the signals of the respective colors are added.
The dynamic range and the video rate can be improved without deteriorating the advantages of the dot sequential CCD sensor having excellent image quality and cost. In addition, when reading a black-and-white document, high productivity can be realized by adding signals of all colors, and when reading a color document, high image quality can be maintained by adding the signals of each color. Machines and scanners can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an image reading apparatus according to the present invention.

FIG. 2 is a diagram showing a X2-X of the CCD sensor shown in FIG. 1;
It is a figure which shows the cross section of 2 '.

FIG. 3 is a diagram for explaining a charge transfer operation in each step in a color mode.

FIG. 4 is a diagram for explaining a charge transfer operation in each step in a monochrome mode.

FIG. 5 is a timing chart for explaining operations in a color mode and a monochrome mode.

FIG. 6 is a diagram illustrating a comparative example of spectral energy of each color.

FIG. 7 is a diagram showing another embodiment of the image reading apparatus according to the present invention.

8 is a diagram illustrating an example of a combined signal of each color when the embodiment illustrated in FIG. 7 is adopted.

FIG. 9 is a diagram showing a schematic configuration of an image reading apparatus using a reduced CCD sensor.

FIG. 10 is a diagram showing a schematic configuration of an image reading apparatus using a three-line CCD sensor.

FIG. 11 is a diagram showing a schematic configuration of an image reading apparatus using a dot-sequential CCD sensor.

[Explanation of symbols]

1, 2,... Photosensitive pixel row, 2-6, vertical transfer shift gate,
7, 8: memory register, 9 to 13: CCD register, 14, 15: adder, 16 to 18: output amplifier, 1
9 to 21 A / D converter, 22 image processing unit, 23 horizontal transfer pulse generation circuit, 24 vertical transfer pulse generation circuit

Claims (9)

[Claims] A color filter arranged in parallel in a plurality of sub-scanning directions for selectively passing an optical image of a document for each color component; The photoelectric conversion elements are arranged in the main scanning direction corresponding to the respective colors of the plurality of color filters, and are arranged in parallel in the plurality of sub-scanning directions for receiving an optical image passing through the color filters and converting the optical image into an electric signal. Photoelectric conversion means;
An image reading apparatus comprising: a signal synthesizing unit that synthesizes a set of electric signals of the same color component at the same position in the sub-scanning direction among the electric signals of the plurality of photoelectric conversion units. 2. The original reading apparatus according to claim 1, wherein
An image reading apparatus, wherein the plurality of color filters are arranged such that a phase of a set of a plurality of colors is shifted in a main scanning direction. 3. A document reading apparatus comprising a light source for illuminating a document, an imaging lens, and a solid-state image pickup device for performing photoelectric conversion, wherein m (m ≧ 2) pixels are mainly provided with n colors (n ≧ 2) as one pixel. A first photosensitive pixel row and a second photosensitive pixel row having a color filter arranged in the scanning direction and a solid-state imaging device corresponding to n pixels and m pixels of the color filter and arranged in parallel in the sub-scanning direction. Two photosensitive pixel rows consisting of
A vertical transfer shift gate group arranged independently for all pixels on both sides in the sub-scanning direction of each of the two photosensitive pixel columns, and a vertical transfer shift gate group arranged on both sides of the two photosensitive pixel columns in the sub-scanning direction; A document reading apparatus, comprising: a plurality of CCD register groups disposed so as to sandwich the same; and a plurality of memory register groups disposed between the first photosensitive pixel row and the CCD registers on both sides. . 4. The original reading apparatus according to claim 3, wherein
The document reading apparatus according to claim 1, wherein the vertical transfer shift gate group is connected to control drive lines for n colors and configured to control independently for each color. 5. The document reading device according to claim 3, wherein
The vertical transfer shift gate group adds a common one-color charge by controlling to transfer a common one-color charge to the two photosensitive pixel rows to an inner CCD register when reading a color original. An original reading apparatus, comprising: 6. The original reading apparatus according to claim 3, wherein
The vertical transfer shift gate group controls the transfer of charges of all colors to the CCD registers inside the two photosensitive pixel rows when reading a monochrome document,
An original reading apparatus, which adds charges of all colors. 7. The document reading apparatus according to claim 3, wherein
The plurality of CCD register groups are arranged for each photosensitive pixel column outside the two photosensitive pixel columns, and
A document reading apparatus, wherein the document reading apparatus is commonly disposed between the two photosensitive pixel rows. 8. The document reading device according to claim 3, wherein
The memory register group, when the pitch between the first photosensitive pixel row and the second photosensitive pixel row is p lines,
P × 2 lines are arranged between the first photosensitive pixel row and the outer CCD register row, and p lines are arranged between the first photosensitive pixel row and the second photosensitive pixel row. A document reading device. 9. The original reading apparatus according to claim 3, wherein
A document reading apparatus, wherein the arrangement order of the colors of the second photosensitive pixel row is shifted from that of the first photosensitive pixel row.