JP2003087532A - One-dimensional image sensor device and image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-dimensional image sensor device and an image reader which can be highly evaluated in many more items than in the conventional manner. SOLUTION: This one-dimensional image sensor device has a plurality of photodetector arrays where a plurality of photodetectors for photoelectric conversion of reflected light from an original are arranged in a horizontal scanning direction. The light receiving area of photodetectors of at least one photodetector array is different from the light receiving area of photodetectors of the other photodetector arrays. This image reader has the one-dimensional image sensor device having photodetectors for monochrome and color. The image reader outputs not only a color signal but also a monochrome signal in a color mode for reading a color original. The image reader preferably has a color signal correction circuit for using information of the monochrome signal to make the color signal to be a signal of high quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-dimensional image sensor device and an image reading device, for example, a copying machine corresponding to a color original, an image processing compound machine (having a printer function, a FAX function, a copying machine function, etc.), The present invention can be applied to an apparatus having an image reading configuration such as an image scanner.

[0002]

2. Description of the Related Art A conventional one-dimensional image sensor device shown in FIG. 30 (hereinafter referred to as a three-line CCD device) or a one-dimensional image sensor device shown in FIG. Equipment (hereinafter 4 line C
CD device) was applied.

In FIG. 30, a 3-line CCD device 1-
Reference numeral 3 denotes a photoelectric conversion structure for each of the three primary colors R, G, and B, and each photoelectric conversion structure is the photodiode array 2 respectively.
R, 2G, 2B and two (2 channels) shift gates 3RO and 3RE, 3GO and 3GE, 3BO and 3
BE and two (2 channels) CCD analog shift registers 4RO and 4RE, 4GO and 4GE, 4BO
And 4BE and two (2 channels) reset gates 5RO and 5RE, 5GO and 5GE, 5BO and 5B.
E, and two (2 channels) clamp circuits 6RO and 6RE, 6GO and 6GE, 6BO and 6BE, and two (2 channels) amplifiers 7RO and 7RE, 7GO and 7GE, 7BO and 7BE. .

The constituent elements of the channel having the suffix "O" are the photodiode array 2
R, 2G, and 2B are for processing the accumulated charges of the odd-numbered photodiodes, and the constituent elements of the channel to which “E” is added at the end of the reference numeral are the even-numbered photodiode arrays 2R, 2G, and 2B. It is intended to process the accumulated charges of the photodiode.

Each photodiode array 2R, 2G, 2
Although not shown in the drawing, the reflected light from the original document when white light is applied to the original document arrives at B through the color filters for the primary colors in charge. Each of the photodiode arrays 2R, 2G, 2B has a predetermined number of photodiodes arranged in the main scanning direction, and accumulates charges (photoelectric conversion) according to the amount of received light.
It is a thing. Photodiode array 2R, 2G, 2B
The light receiving areas of the respective photodiodes constituting the above are all the same.

Each photodiode array 2R, 2G, 2
The accumulated charges of B are gate control signals SH-R, SH-G,
The corresponding CCD analog shift register 4R is opened via the corresponding shift gates 3RO, 3RE, 3GO, 3GE, 3BO, 3BE which are opened according to SH-B.
O, 4RE, 4GO, 4GE, 4BO, 4BE.

Each CCD analog shift register 4RO,
Charges stored in the photodiode arrays 2R, 2G, and 2B are transferred to 4RE, 4GO, 4GE, 4BO, and 4BE at a predetermined timing. CCD analog shift registers 4RO, 4RE, 4GO, 4GE, 4BO, 4BE
Outputs the transferred accumulated charges as a serial signal (one-dimensional image signal) according to the clock signal. At this time, the reset gates 5RO and 5R are arranged so that the signal of each photodiode (pixel) does not affect other pixels.
The signal of the next pixel is output after reset processing via E, 5GO, 5GE, 5BO, and 5BE. After that, each clamp circuit 6RO, 6RE, 6GO, 6GE,
It is clamped by 6BO and 6BE, and further the corresponding amplifiers 7RO, 7RE, 7GO, 7GE, 7BO and 7
The signal is amplified by BE and output.

In FIG. 31, which is the same as FIG. 30 and shows the same parts as the corresponding parts, the four-line CCD device 1 is shown.
-4 has a photoelectric conversion configuration for monochrome (B / W) in addition to the photoelectric conversion configuration for each of the three primary colors R, G, and B.

In the case of this conventional example, the photoelectric conversion structure for the three primary colors R, G, and B is a one-channel structure, and the photoelectric conversion structure for monochrome is a two-channel structure.

Except for the difference in the number of channels, the constituent elements of each photoelectric conversion structure are the above-mentioned 3-line CCD device 1.
It is similar to the case of -3.

Also in the 4-line CCD device 1-4, the photodiode arrays 2R, 2G, 2B, 2B /
The light receiving areas of the photodiodes forming W are all the same.

By the way, in a copier or the like that supports color originals, the original reading modes include a color mode for reading a color original and a monochrome mode for reading a monochrome original.

In the copying machine to which the above-mentioned three-line CCD device 1-3 is applied, the subsequent processing is performed in both the color mode and the monochrome mode by using the outputs from the photoelectric conversion structure of the three primary colors R, G and B. There is. That is, in the monochrome mode, the obtained three primary color signals (R, G, B outputs)
Monochrome signals are synthesized and obtained from, and the subsequent processing is performed.

On the other hand, the 4-line CCD device 1-4
In the copying machine to which is applied, the subsequent processing is performed by using the output from the photoelectric conversion configuration of the three primary colors R, G, and B in the color mode, and the subsequent processing is performed by using the output from the monochrome photoelectric conversion configuration in the monochrome mode. It is processing.

[0015]

However, the conventional one-dimensional image sensor device and the image reading device to which the conventional one-dimensional image sensor device is applied have the following problems.

In the 3-line CCD device 1-3,
The light receiving area of each photodiode is made large in consideration of the light attenuation in the color filter that selects the R, G, and B light components. Therefore, the 3-line CCD device 1-3 becomes large and the cost is high.

In the image reading apparatus to which the 3-line CCD device 1-3 is applied, in the monochrome mode, the monochrome signals are synthesized from the three primary color signals (R, G, B outputs), and therefore, the color filters of the respective color filters are used. Due to variations in characteristics,
In some cases, the monochrome gradation of the original was correct and the resulting monochrome signal did not appear. Even in the color mode, color image quality may be deteriorated (chromatic aberration) due to variations in the characteristics of each color filter.

Further, when the image reading device to which the 3-line CCD device 1-3 is applied performs the reading operation while the original document is running, the distance between the R, G, and B photodiode arrays is equal to the received light. Since the area is large, the area is large, and there is a risk that the image quality will be slightly deteriorated at the wavy or wrinkled portions of the document. That is, the through-pass read characteristic has some problems.

Considering that the conventional 4-line CCD device 1-4 has a monochrome (B / W) photoelectric conversion structure in addition to the photoelectric conversion structure for each of the three primary colors R, G and B,
The light receiving area of each photodiode is considerably reduced (for example, 1 / th of that of the conventional 3-line CCD device 1-3).
4) As a result, the overall configuration of the 4-line CCD device 1-3 is small and inexpensive.

However, since the light receiving area of the photodiode is small, there is a problem that the image quality in the color mode is somewhat deteriorated due to the light attenuation in the color filter.

In order to avoid this, it is necessary to make the reading speed in the sub-scanning direction in the color mode slower than the reading speed in the sub-scanning direction in the monochrome mode, and it takes a long time to read the color original document. The problem arises that
In addition, if a variable speed drive motor is used as a drive motor for moving the document or the irradiation optical unit (white light source, mirror, etc.) in the sub-scanning direction, it must be compatible with two speeds in the sub-scanning direction. There is also the problem of not becoming.

Further, the image reading device to which the 4-line CCD device 1-4 is applied has a problem that the color through-pass read characteristic is considerably inferior because the light receiving area of the photodiode is small as described above.

The present invention has been made in view of the above points, and a plurality of one-dimensional image sensor devices such as size and cost, monochrome image quality, color image quality, speed in the sub-scanning direction in color mode, through-pass read characteristics, etc. The present invention aims to provide a one-dimensional image sensor device and an image reading device that can improve the evaluation of more items than the conventional ones.

[0024]

In order to solve such a problem, the first aspect of the present invention has a plurality of light receiving element arrays in which a plurality of light receiving elements for photoelectrically converting reflected light from a document are arranged in the main scanning direction. In a one-dimensional image sensor device for serially outputting an electric signal by photoelectric conversion of all or some of the light receiving element arrays, the light receiving area of the light receiving element of at least one of the light receiving element arrays is different from the other light receiving element array Is different from the light receiving area of the light receiving element of.

The second aspect of the present invention is an image having the one-dimensional image sensor device of the first aspect of the present invention, which has a monochrome light receiving element array and a plurality of color light receiving element arrays for different color components. The reading device is characterized in that, in a color mode for reading a color original, a monochrome signal is output from the one-dimensional image sensor device in addition to the color signal. Here, it is preferable to have a color signal correction circuit that improves the image quality of the color signal by using the information of the monochrome signal.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION (A) First Embodiment Hereinafter, a first embodiment of a one-dimensional image sensor device and an image reading device according to the present invention will be described in detail with reference to the drawings.

(A-1) Configuration of the First Embodiment FIG. 1 is a block diagram showing the configuration of the image reading apparatus of the first embodiment.

In FIG. 1, the image reading apparatus 10 according to the first embodiment includes a one-dimensional image sensor device 11-1 according to the first embodiment, an analog processing circuit 12, and an analog / digital conversion circuit (A / D conversion circuit). ) 13, a shading correction circuit 14, an interline correction circuit 15, a color signal correction circuit 16, a page memory 17, an output image processing circuit 18,
Timing generation circuit 19, control unit (CPU) 20, memory 21, control panel 22, mechanism drive circuit 23
And a white lamp 24 and the like.

The control unit (CPU) 20 controls the entire image reading apparatus 10 according to programs and data stored in the memory 21 and using the memory 21 as a working memory.

The control panel 22 provides the control unit 20 with information input by the user such as an operation mode such as a color mode or a monochrome mode and the number of prints. The mechanical system drive circuit 23 drives a moving mechanism in the sub-scanning direction under the control of the control unit 20. The white lamp 24 illuminates the document with white light under the control of the control unit 20.

Here, in the case of the first embodiment, the moving speed in the moving mechanism in the sub-scanning direction is the same in the color mode and the monochrome mode, and the mechanism system drive circuit 23.
Operates without distinguishing between the color mode and the monochrome mode.

Under the control of the control unit 20, the timing generation circuit 19 includes a one-dimensional image sensor device 11-1, an analog processing circuit 12, an analog / digital conversion circuit 13, a shading correction circuit 14, a line correction circuit 15, and a color. The timing signal is generated and given to the signal correction circuit 16 and the page memory 17.

The one-dimensional image sensor device 11-1 has a structure as shown in FIG. 2, and has one channel for each of the three primary colors R, G and B, and two channels for monochrome, totaling five channels, as will be described later. The read signal (analog signal) is obtained and output to the analog processing circuit 12.

Incidentally, according to the fact that the color mode and the monochrome mode are completely separated in terms of time,
The output lines of the three primary colors R, G, and B and the output line of monochrome are selected (switched) and input to the analog processing circuit, and a part of the processing system after the analog processing circuit is switched to the color mode and the monochrome mode. However, in the first embodiment, the 5-channel read signals (analog signals) from the one-dimensional image sensor device 11-1 are output to the analog processing circuit 12 in parallel.

The analog processing circuit 12 has a 5-channel structure and performs analog processing to convert a read signal (analog signal) from the one-dimensional image sensor device 11-1 into a signal suitable for conversion into a digital signal. The configuration of each channel is the same as the conventional one, such as coupling capacitor, CDS circuit (or sample hold circuit), gain amplifier, offset removal circuit, level shifting, noise component removal, amplification, etc. It is composed of each element of.

The analog / digital conversion circuit 13 converts the read signals of the three primary colors R, G, B output from the analog processing circuit 12 and the monochrome read signal into digital signals and gives them to the shading correction circuit 14. is there. The two monochrome channels (read signals) are the channels from the odd-numbered photodiodes of the photodiode array and the channels from the even-numbered photodiodes of the photodiode array, as will be described later. In the analog / digital conversion circuit 13, the read signals of the respective channels are converted into digital signals and then combined into one system of read signals.

The shading correction circuit 14 causes variations in sensitivity among the photodiodes and uneven illumination of the white lamp 24 (especially uneven illumination in the main scanning direction) with respect to digital read signals of the three primary colors R, G, B and monochrome. It is corrected and given to the interline correction circuit 15.

The interline correction circuit 15 includes three primary colors R, G,
In consideration of the difference in the positions of the B photodiode array and the monochrome photodiode array in the sub scanning direction, the three primary colors R, G, and The signal is converted into a signal when B and monochrome lines are combined and given to the color signal correction circuit 16.

Here, in the case of the first embodiment, the interline correction circuit 15 outputs color output (R output, G output, from the one-dimensional image sensor device 11-1) as described later.
While B output) is performed once (for one line), monochrome output (B / W output 1 and B / W output 2) is performed twice (for two lines), so that for color output Interpolation processing that doubles the number of lines (resolution) in the sub-scanning direction is also performed. This interpolation processing constitutes one of the features of the first embodiment. As this interpolation processing, for example, the average of the signals of the upper and lower two lines can be applied to the signal of the line at the intermediate position (virtual position).

The color signal correction circuit 16 is a circuit that constitutes one of the features of the first embodiment. That is, although the analog processing circuit 12, the analog / digital conversion circuit 13, the shading correction circuit 14, the line correction circuit 15 and the like are also provided in the conventional device, the color signal correction circuit 16 is provided in the first embodiment. It was first introduced with the device.

The color signal correction circuit 16 functions in the color mode, and utilizes the information of the monochrome output signal from the line correction circuit 15 to output the three primary colors R, G, from the line correction circuit 15. The output signal of B is converted into three primary color signals (color signals) with an increased resolution. For example, a 300-dpi signal is converted into a 600-dpi signal. The details of the color signal correction circuit 16 will be described later.

The page memory 17 stores the image signal of the read document. In the color mode, the image signal (color signal) processed by the color signal correction circuit 16 is stored. In the monochrome mode, the image signal (monochrome signal) output from the interline correction circuit 15 and directly passed through the color signal correction circuit 16 is stored.

The output image processing circuit 18 receives the image signal directly supplied from the color signal correction circuit 16 and the image signal once stored in the page memory 17 and read out from the page memory 17 by the image reading apparatus 10. The image processing is performed according to the output format from the. For example, when the image reading device 10 is provided in the image scanner, the image signal is processed so as to be given to an external personal computer or printer. Further, for example, when the image reading apparatus 10 is installed in a color-compatible copying machine, image processing that can drive an optical system that forms a latent image on the photosensitive drum is executed.

FIG. 2 is a block diagram showing the detailed structure of the one-dimensional image sensor device 11-1 of the first embodiment, which is the same as FIG. 30 and FIG. 31 according to the conventional example described above.
Corresponding parts are designated by the same reference numerals. The entire one-dimensional image sensor device 11 shown in FIG. 2 is realized as, for example, one chip.

In FIG. 2, the one-dimensional image sensor device 11-1 has a photoelectric conversion structure for each of the three primary colors R, G, B and a monochrome photoelectric conversion structure.

The photoelectric conversion configurations for the three primary colors R, G, B are respectively photodiode arrays 2R, 2G, 2B, shift gates 3R, 3G, 3B, CCD analog shift registers 4R, 4G, 4B, and reset gates. 5R, 5
G, 5B, clamp circuits 6R, 6G, 6B, and amplifiers 7R, 7G, 7B.

Further, the monochrome photoelectric conversion structure has a photodiode array 2B / W and two (2 channels).
Shift gates 3B / WO and 3B / WE and two Cs
CD analog shift register 4B / WO and 4B / WE
And two reset gates 5B / WO and 5B / WE
And two clamp circuits 6B / WO and 6B / WE,
It has two amplifiers 7B / WO and 7B / WE.

Shift gate 3B / WO, CCD analog shift register 4B / WO, reset gate 5B / W
O, the clamp circuit 6B / WO and the amplifier 7B / WO are
This is for processing the accumulated charges of the odd-numbered photodiodes in the photodiode array 2B / W, and includes the shift gate 3B / WE and the CCD analog shift register 4.
B / WE, reset gate 5B / WE, clamp circuit 6
The B / WE and the amplifier 7B / WE process the accumulated charges of the even-numbered photodiodes in the photodiode array 2B / W.

The functions of the photodiode array, the shift gate, the CCD analog shift register, the reset gate, the clamp circuit and the amplifier are the same as in the conventional case.

The photodiode arrays 2R, 2G, 2B for the three primary colors R, G, B and the photodiode array 2B / W for monochrome are arranged so that their positions in the main scanning direction are aligned and in the sub-scanning direction. As shown in FIG.
Each photodiode array 2R, 2G, 2B, 2B / W
Are arranged so that the distance between the center lines (shown by a chain line) is an integral multiple of the reading pitch.

The light-receiving surfaces of the photodiodes of the three primary color R, G, B photodiode arrays 2R, 2G, 2B and the monochrome photodiode array 2B / W are, for example, square.

In the case of the first embodiment, the three primary colors R,
The light receiving area of each photodiode of the monochrome photodiode array 2B / W is set to 1/4 of the light receiving area of each photodiode of the G and B photodiode arrays 2R, 2G, and 2B. The three primary colors R,
The light receiving areas of the photodiodes of the G and B photodiode arrays 2R, 2G, and 2B are the same. The light receiving surface of the photodiodes for the three primary colors R, G, and B is selected to have a length twice that in the main scanning direction and the sub scanning direction as compared with the light receiving surface of the monochrome photodiode. Therefore, the number of photodiodes in the monochrome photodiode array 2B / W is twice the number of photodiodes in the three primary color R, G, B photodiode arrays 2R, 2G, 2B.

Further, from the above-mentioned timing generation circuit 19, the one-dimensional image sensor device 11-1 of the first embodiment is used.
For example, the timing signals given to the following are as follows.

A shift gate 3R for the three primary colors R, G, B,
3G, 3B, the photodiode array 2R,
The shift command signals SH-R, SH-G, and SH-B for instructing to transfer the accumulated charges of 2G and 2B to the CCD analog shift registers 4R, 4G, and 4B are the same. On the other hand, the two monochrome shift gates 3B / WO and 3B / WE are commonly supplied, and the charges accumulated in the photodiode array 2B / W are transferred to the CCD analog shift registers 4B / WO and 4B / WE. The shift command signals SH-B / W for instructing that are the shift command signals SH-R, SH-G, S for the three primary colors described above.
It has a half cycle of H-B (see FIG. 7 described later).

On the other hand, the clock signal for serially taking out the accumulated charges from the CCD analog shift register is supplied to all CCD analog shift registers 4R,
It is common to 4G, 4B, 4B / WO and 4B / WE (see FIG. 7 described later).

The one-dimensional image sensor device 1 as described above
1-1 configuration and one-dimensional image sensor device 11-
1, the resolution of the monochrome output signal (B / W output 1 and B / W output 2) from the one-dimensional image sensor device 11-1 according to the first embodiment is set to the main scanning direction. In both the sub-scanning direction and the sub-scanning direction, the resolution of the output signal (R output, G output, B output) related to color is twice.

For example, the number of photodiodes (the number of pixels) of the monochrome photodiode array 2B / W is 750.
If the number is 0, as shown in the image diagram of FIG.
When the accumulated charges of the 1st to 3750th photodiodes are sequentially output as the R output, the G output, and the B output,
The B / W output 1 sequentially outputs the accumulated charges of the 1st, 3rd, ..., 7499th (odd-numbered) photodiodes, and the B / W output 2 outputs the 2, 4, ..., 7500th (even-numbered). The accumulated charges of the photodiodes in) are sequentially output in parallel. In addition, the shift command signal SH-B / W for monochrome is the shift command signal SH-R for three primary colors,
Since the cycle is 1/2 that of SH-G and SH-B,
When the B / W output 1 and the B / W output 2 are effective outputs of the accumulated charge, a cycle in which the R output, the G output, and the B output are not output also occurs.

Four types of photodiode arrays 2R, 2
The order of G, 2B, and 2B / W in the sub-scanning direction is arbitrary, but the monochrome photodiode array 2B / W is
Photodiode arrays 2R, 2 for three primary colors R, G, B
It is not between G and 2B but at the end (top or bottom in FIG. 2) that there are three outputs related to color (R output,
It is preferable in terms of the balance of G output and B output). Figure 2
Shows the case where the monochrome photodiode array 2B / W is at the bottom.

FIG. 5 is a block diagram showing a detailed configuration of the color signal correction circuit 16 which constitutes one of the characteristics of the first embodiment, and FIG. 6 is a block diagram showing this color signal correction circuit 16.
It is an outline explanatory view of the process of.

In FIG. 5, the color signal correction circuit 16
Is a CrCb calculation circuit 30 and an RGB resolution correction circuit 3
1, a parameter storage memory 32, two 1-pixel delay buffers 33 and 34, and a data selector 35.

Due to the function of the interline correction circuit 15 described above, the color signal correction circuit 16 has the monochrome pixel data K having the relationship shown in FIGS. 6A and 6B.
(I, j) and three primary color pixel data R (k, j), G
(K, j) and B (k, j) are input in a raster scan pattern for the original. Before this correction, the number of pixels in the sub-scanning direction is the same as that in monochrome and color, but the number of pixels in the main scanning direction is twice that in monochrome, so that there are three primary color pixel data R (k, j). , G (k, j), B
When (k, j) is input, K (2k, j) and K (2k + 1, j) are input for monochrome.

The CrCb calculation circuit 30 and the one-pixel delay buffer 33 are the YCrC shown in the equations (1) to (4).
b conversion is performed. That is, the luminance signal (Y),
The first color difference signal (Cr: RY component) and the second color difference signal (Cb: BY component) are converted.

Y (2k, j) = K (2k, j) (1) Y (2k + 1, j) = K (2k + 1, j) (2) Cr (k, j) = ar0R (k, j) + Ag0G (k, j) + ab0B (k, j) (3) Cb (k, j) = ar1R (k, j) + ag1G (k, j) + ab1B (k, j) (4) The monochrome signal K remains unchanged. Since it can be handled as the luminance signal Y, the input monochrome signal K (i, j) = K
The luminance signal Y (2k +
1, j) can be input to the RGB resolution correction circuit 31, and the input monochrome signal K (i, j) is 1
The luminance signal Y (2k, j) according to the equation (1) is RG by delaying it by one pixel period via the pixel delay buffer 33.
It can be input to the B resolution correction circuit 31.

As is well known, the first color difference signal (Cr: RY component) and the second color difference signal (Cb: BY component) are
Further, as shown in the equations (3) and (4), it can be formed from the signals of the three primary colors R, G, and B even if there is no luminance signal, and the CrCb calculation circuit 30 uses the parameter storage memory 32. The parameters ar0, ag0, ab0, stored in
The pixel data Cr (k, j) of the first color-difference signal and the pixel data Cb of the second color-difference signal are obtained by executing the operations of the expressions (3) and (4) using ar1, ag1, and ab1.
(K, j) is obtained and input to the RGB resolution correction circuit 31.

The RGB resolution correction circuit 31 uses the equation (5)-
RGB primary conversion according to the equation (10) is executed to increase the resolution (number of pixels) in the main scanning direction of the three primary colors R ′, G ′,
To get B '.

R ′ (2k, j) = K (2k, j) + br0Cr (k, j) (5) G ′ (2k, j) = K (2k, j) + br1Cr (k, j) + bb1Cr (k) , J) ... (6) B '(2k, j) = K (2k, j) + bb0Cr (k, j) ... (7) R' (2k + 1, j) = K (2k + 1, j) + br0Cr (k, j) ) ... (8) G '(2k + 1, j) = K (2k + 1, j) + br1Cr (k, j) + bb1Cr (k, j) ... (9) B' (2k + 1, j) = K (2k + 1, j) + bb0Cr (K, j) ... (10) As is well known, the luminance signal (Y = K), the first color difference signal (Cr) and the second color difference signal (Cb) are converted into the three primary color signals R ′, G ′, B. Can be converted to '. In the first embodiment, the number of pixels of the luminance signal (Y = K) in the main scanning direction is twice the number of pixels of the first color difference signal (Cr) and the second color difference signal (Cb) in the main scanning direction. Is used, the number of pixels in the main scanning direction in the converted three primary color signals R ′, G ′, and B ′ is set to be the same as the number of pixels in the luminance signal (Y = K) before conversion. .

The above equations (5) to (7) are equations for calculating the data of even-numbered pixel positions in the converted three primary color signals R ', G', B ', and the above equation (8). ~ (1
Equation (0) is an equation for calculating data of odd-numbered pixel positions in the converted three primary color signals R ′, G ′, and B ′.
The resolution correction circuit 31 calculates these equations (5) to (10) almost in parallel using the parameters br0, br1, bb0, bb1 stored in the parameter storage memory 32.

The RGB resolution correction circuit 31 uses the equation (5)-
The three primary color signals R ′ (2k, j), G ′ (2k, j), B ′ (2
k, j) is given as a first selection input to the data selector 35, and the three primary color signals R ′ (2k + 1, 2k + 1,
j), G '(2k + 1, j), B' (2k + 1, j)
Is delayed by one pixel period via the one-pixel delay buffer 34 and supplied to the data selector 35 as a second selection input. Note that, in FIG. 5, even in the color mode, the luminance signals, that is, the monochrome signals K (2k, j) and K (2
(k + 1, j) is output from the color signal correction circuit 16.

The data selector 35 outputs an odd / even identification signal (Od in FIG. 5) of the pixel position from the timing generation circuit 19.
d / Even pixel identification signal), R '(2k + 1, j), G' (2k + 1, j), B'at odd numbers.
(2k + 1, j) is selected, and R '(2k,
j), G '(2k, j) and B' (2k, j) are selected and output.

(A-2) Operation of the First Embodiment Next, the one-dimensional image sensor device 11 of the first embodiment.
-1 and the operation of the image reading apparatus 10 will be described. Hereinafter, the operation in the color mode will be mainly described.

In the image reading apparatus 10 shown in FIG. 1, when the control panel 22 gives an instruction to read an original in the color mode, the control unit 20 turns on the white lamp 24 or causes the drive circuit 23 to read the reading mechanism system. The one-dimensional image sensor device 11- indirectly or directly via the timing generation circuit 19
1. The electrical processing system such as the analog processing circuit 12, the analog / digital conversion circuit 13, the shading correction circuit 14, the line correction circuit 15, the color signal correction circuit 16 and the page memory 17 is activated.

The moving speed in the sub-scanning direction in the reading mechanism system is the same in the color mode as in the monochrome mode.

For the one-dimensional image sensor device 11-1, the timing generation circuit 19 shifts the shift command signal SH-R as shown in the timing charts of FIGS. 7 and 8.
SH-G, SH-B, SH-B / W, a clock signal, a reset signal, and a clamp signal are given.

In the one-dimensional image sensor device 11-1, the photodiode array 2 for the three primary colors R, G and B is used.
The charges accumulated by photoelectric conversion in R, 2G, and 2B are C according to the shift command signals SH-R, SH-G, and SH-B.
The photodiode array 2 is moved to the CD analog shift registers 4R, 4G, 4B, and according to the clock signal.
CCD analog shift registers 4R, 4G, and 4B within the period in which R, 2G, and 2B perform the next photoelectric conversion and charge accumulation.
Serial output from the reset gate 5R,
5G, 5B, clamp circuits 6R, 6G, 6B, amplifier 7
It is given to the analog processing circuit 12 through R, 7G, and 7B in order.

Here, as shown in FIG. 8, a reset signal is applied to the reset gates 5R, 5G, and 5B in the first half period of the significant pulse period of the clock signal, so that signals between pixels are reliably separated, and , Clamp circuit 6R, 6
A clamp signal is applied to G and 6B in the latter half period of the significant pulse period of the clock signal to clamp the read pixel signal.

On the other hand, the charge accumulated by photoelectric conversion in the monochrome photodiode array 2B / W is in accordance with the shift command signal SH-B / W, and each CCD analog shift register 4B for odd and even pixels. / W
O, 4B / WE, and serial output from each CCD analog shift register 4B / WO, 4B / WE during the next photoelectric conversion and charge accumulation period by the photodiode array 2B / W according to the clock signal. , And then reset gates 5B / WO and 5B / W, respectively
E, clamp circuit 6B / WO, 6B / WE, amplifier 7B
/ WO, 7B / WE in sequence, analog processing circuit 1
Given to 2.

Here, the shift command signal SH-B / W is
Shift command signals SH-R, SH-G, SH- for the three primary colors
Since the cycle is half that of B, as shown in FIG. 7, the monochrome output (B / W output 1 and B / W output 2) is output from the one-dimensional image sensor device 11-1. When only two lines are output in the scanning direction, color output (R, G, B outputs) is output by one line in the sub-scanning direction.

The output signals of the three primary colors R, G, B output from the one-dimensional image sensor device 11-1 and the monochrome two-channel signal as described above are level-shifted or noise-dependent in the analog processing circuit 12. After being removed or amplified, the analog / digital conversion circuit 13 converts the digital signal. The monochrome 2-channel signal is not only converted into a digital signal in the analog / digital conversion circuit 13, but also unified into a 1-channel signal. After that, the three primary colors R,
The G and B signals (digital signals) and the monochrome signals (digital signals) are supplied to the shading correction circuit 14.
Shading correction for uneven illumination is applied to the interline correction circuit 15.

The output signal from the shading correction circuit 14 is supplied to the interline correction circuit 15 for the three primary colors R, G, and
Considering the difference in position in the sub-scanning direction between the photodiode array for B and the photodiode array for monochrome, the signals when the lines of the three primary colors R, G, B and monochrome are aligned in the sub-scanning direction are considered. The converted color signals (R, G, B) are further converted into double-density signals in the sub-scanning direction and given to the color signal correction circuit 16.

As described above, the color signal correction circuit 16 performs YCrCb conversion on the input color signals (R, G, B) and the monochrome signal (K) and RGB inverse conversion processing on the converted signals. , The primary colors R, G, and B output signals from the interline correction circuit 15 have a higher resolution (doubled) in the sub-scanning direction.
G and B signals (color signals) are obtained.

Such a color signal is transmitted to the page memory 1
After being temporarily stored in 7, the image is read out or directly given to the output image processing circuit 18, subjected to image processing according to the output format, and output from the image reading apparatus 10.

The image reading operation in the monochrome mode is an operation in which only the processing system for the monochrome signal effectively functions even if the one-dimensional image sensor device 11-1 outputs the color signal.

(A-3) Effects of the First Embodiment According to the one-dimensional image sensor device 11-1 and the image reading device 10 to which the one-dimensional image sensor device 11-1 of the first embodiment is applied, the following effects can be obtained. .

In the one-dimensional image sensor device 11-1 of the first embodiment, even if the light attenuation in the color filter for selecting the R, G and B light components is taken into consideration, the light receiving area of each photodiode is Since it is made large, it can be expected that the gradation is good.

Even if the light receiving area of each color photodiode is large, the structure for taking out the accumulated charge of each color photodiode array is a one-channel structure, and the light receiving area of each monochrome photodiode is small. It can be expected that the one-dimensional image sensor device 11-1 is downsized and the cost is reduced.

Further, since the one-dimensional image sensor device 11-1 of the first embodiment has the monochrome photodiode array, the image quality in the monochrome mode is good.

Further, since the light receiving area of each color photodiode is large, the color image quality is deteriorated even if the speed in the sub-scanning direction in the color mode is made equal to the speed in the sub-scanning direction in the monochrome mode. Can be minimized. This (single speed) means that the moving mechanism in the sub-scanning direction and its drive circuit can be simplified.

The deterioration of image quality for the same speed is as follows.
Compensation can be performed by the correction processing by the line correction circuit 15 and the color signal correction circuit 16, and the color image quality can be made sufficient. In particular, the color signal correction circuit 16 has a novel idea of using information of a monochrome signal having a higher resolution for the correction of the color signal, and the image quality improvement by the correction is larger than that of the existing color signal correction technique.

Furthermore, since the light receiving area of each color photodiode is large and the correction processing is performed by the color signal correction circuit 16 described above, the improvement of the color through pass read characteristic can be expected.

(B) Second Embodiment Next, a second embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device according to the second embodiment will be described focusing on the differences from the first embodiment.

FIG. 9 is a block diagram showing the configuration of the one-dimensional image sensor device 11-2 according to the second embodiment, and the above-described FIG. 2 according to the one-dimensional image sensor device 11-1 according to the first embodiment. The same and corresponding parts are indicated by the same and corresponding symbols.

The position of the one-dimensional image sensor device 11-2 of the second embodiment with respect to the entire image reading device is the same as that of the one-dimensional image sensor device 11-1 of the first embodiment, as shown in FIG. It is the position shown in.

The constituent elements of the one-dimensional image sensor device 11-2 of the second embodiment are the elements of the first embodiment.
Similar to the elements that make up the three-dimensional image sensor device 11-1, but the light receiving surfaces of the photodiode arrays 2R, 2G, and 2B for the three primary colors R, G, and B, and the monochrome photodiodes. The relationship with the light receiving surface of each photodiode of the array 2B / W is different between the second embodiment and the first embodiment.

In the case of the second embodiment, the light-receiving surface of each photodiode of the monochrome photodiode array 2B / W has, for example, a square shape and three primary colors R,
The photodiodes of the G and B photodiode arrays 2R, 2G, and 2B have the same light receiving surface in the sub-scanning direction as the monochrome photodiode, and the main scanning direction in the monochrome scanning direction. It is twice as large as a photodiode. That is, the photodiodes for the three primary colors R, G, and B have a light-receiving area twice as large as that of the monochrome photodiode. Expressed from another perspective, the three primary colors R,
The number of photodiodes of the G and B photodiode arrays 2R, 2G, and 2B (the number of pixels in the main scanning direction) is half that of the monochrome photodiode array 2B / W.

In the second embodiment as well, 3
Photodiode arrays 2R, 2 for the primary colors R, G, B
G, 2B and monochrome photodiode array 2B
/ W are arranged such that their positions in the main scanning direction are aligned, and in the sub scanning direction, each photodiode array 2R,
The center lines of 2G, 2B, and 2B / W are arranged so that the distance between them is an integral multiple of the reading pitch (see FIG. 3).

FIG. 10 is a timing chart showing the operation of the one-dimensional image sensor device 11-2 of the second embodiment. Note that FIG. 10 shows a case where the number of photodiodes (the number of pixels in the main scanning direction) of the monochrome photodiode array 2B / W is 7,500.

From the timing generation circuit 19 (see FIG. 1), the one-dimensional image sensor device 11- of the second embodiment is
2 includes shift command signals SH- for the three primary colors R, G, and B.
The same R, SH-G, SH-B and the monochrome shift command signal SH-B / W are given. Further, from the timing generation circuit 19, all the CCD analog shift registers 4R, 4G, 4B, 4B are used as clock signals.
/ WO and 4B / WE are given in common.

In the case of the second embodiment, the one-dimensional image sensor device 11-2 is configured by the above-described configuration of the one-dimensional image sensor device 11-2 and the configuration of the timing signal given to the one-dimensional image sensor device 11-2. -2, the resolution of the monochrome output signals (B / W output 1 and B / W output 2) is 2 in the main scanning direction of the resolution of the color output signals (R output, G output, B output). Is doubled.

In the case of the second embodiment, processing for processing output signals (R output, G output, B output, B / W output 1 and B / W output 2) from the one-dimensional image sensor device 11-2. Among the system elements, the processing of the line correction circuit 15 is slightly different from that of the first embodiment, and the processing of the other circuits is almost the same as that of the first embodiment.

The interline correction circuit 15 uses the three primary colors R, G,
In consideration of the difference in the positions of the B photodiode array and the monochrome photodiode array in the sub scanning direction, the three primary colors R, G, and The signal is converted into a signal when B and monochrome lines are combined and given to the color signal correction circuit 16. In the case of the second embodiment, unlike the first embodiment, the inter-line correction circuit 15 does not execute an interpolation process for doubling the number of lines (resolution) in the sub-scanning direction for color output. .

The operation of the image reading apparatus of the second embodiment is that the one-dimensional image sensor apparatus 11-2 always outputs color and monochrome outputs in parallel, as is apparent from the above description of the configuration. It is the same as the first embodiment except that the inter-line correction circuit 15 does not execute the interpolation process for doubling the number of lines (resolution) in the sub-scanning direction, and therefore the description thereof is omitted.

Also according to the one-dimensional image sensor device 11-2 of the second embodiment and the image reading device to which the one-dimensional image sensor device 11-2 is applied,
The same effect as that of the first embodiment can be obtained.

In addition to this, since the light-receiving surface of each photodiode of the color photodiode array is short in the sub-scanning direction, it is expected that the one-dimensional image sensor device 11-2 will be further downsized and the cost will be reduced. Even in this case,
The color resolution in the main scanning direction is increased by the function of the color signal correction circuit 16.

(C) Third Embodiment Next, a third embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device of the third embodiment will be described focusing on the differences from the first embodiment.

FIG. 11 is a block diagram showing the structure of the one-dimensional image sensor device 11-3 of the third embodiment.
The same or corresponding portions as those in FIG. 2 described above according to the one-dimensional image sensor device 11-1 of the first embodiment are designated by the same or corresponding reference numerals.

The position of the one-dimensional image sensor device 11-3 of the third embodiment with respect to the entire image reading device is the same as that of the one-dimensional image sensor device 11-1 of the first embodiment, as shown in FIG. It is the position shown in.

The one-dimensional image sensor device 11-3 according to the third embodiment has a photodiode surface for each of the three primary colors R, G, B and a photodiode array 2R, 2G, 2B, and a monochrome photodiode. The relationship with the light-receiving surface of each photodiode of the array 2B / W is the same as in the first embodiment.

The one-dimensional image sensor device 11-3 according to the third embodiment is different from that according to the first embodiment in that the charge stored in the monochrome photodiode array 2B / W is output to the outside. is there.

That is, instead of the monochrome odd-numbered and even-numbered CCD analog shift registers 4B / WO and 4B / WE in the first embodiment, in the third embodiment, the photodiode array 2B / W is arranged. The CCD analog shift register 4B / WS to which the accumulated charge of the photodiode having the smaller order is transferred, and the CCD analog shift register to which the accumulated charge of the photodiode having the larger arrangement order in the photodiode array 2B / W is transferred. 4B / WB is provided, and these CCD analog shift registers 4B / WS and 4B / WS are provided.
A shift gate 3B / W for controlling transfer of accumulated charges of the photodiode array 2B / W to WB is provided.

The reset gate 5B / W is provided at the output stage of one CCD analog shift register 4B / WS.
S, a clamp circuit 6B / WS and an amplifier 7B / WS are provided, and the other CCD analog shift register 4B / W
The output stage of B is provided with a reset gate 5B / WB, a clamp circuit 6B / WB, and an amplifier 7B / WB.

As described above, the one-dimensional image sensor device 11-3 of the third embodiment is different from that of the first embodiment in the structure for outputting the charges accumulated in the monochrome photodiode array 2B / W to the outside. Although different, the read image signal processing system after the analog processing circuit 12 is almost the same as that of the first embodiment.

The monochrome outputs (B / W1 output and B / W output 2) from the one-dimensional image sensor device 11-3 of the third embodiment are ascending order and descending order as shown in FIG. Therefore, the process of integrating the two-channel monochrome signal converted into the digital signal by the analog / digital conversion circuit 13 into the one-channel monochrome signal is different from that of the first embodiment.

According to the one-dimensional image sensor device 11-3 of the third embodiment and the image reading device to which the one-dimensional image sensor device 11-3 is applied,
The same effect as that of the first embodiment can be obtained.

In addition to this, two CCD analog shift registers 4B / WS and 4B / WB and a shift gate 3 are provided.
Since the B / W is disposed only on one of the upper and lower sides of the photodiode array 2B / W, it is expected that the one-dimensional image sensor device 11-3 will be further downsized and the cost will be reduced.

(D) Fourth Embodiment Next, a fourth embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device of the fourth embodiment will be described focusing on the differences from the first embodiment.

FIG. 13 is a block diagram showing the structure of the one-dimensional image sensor device 11-4 of the fourth embodiment.
The same or corresponding portions as those in FIG. 2 described above according to the one-dimensional image sensor device 11-1 of the first embodiment are designated by the same or corresponding reference numerals.

The position of the one-dimensional image sensor device 11-4 of the fourth embodiment with respect to the entire image reading device is the same as that of the one-dimensional image sensor device 11-1 of the first embodiment, as shown in FIG. It is the position shown in.

The one-dimensional image sensor device 11-4 of the fourth embodiment is configured so that the photodiode arrays 2R, 2G, 2B for the three primary colors R, G, B have their light-receiving surfaces and the monochrome photodiodes. The relationship with the light-receiving surface of each photodiode of the array 2B / W is the same as in the first embodiment.

The one-dimensional image sensor device 11-4 according to the fourth embodiment is different from that according to the first embodiment in that the one-dimensional image sensor device 11-4 outputs the accumulated charges of the monochrome photodiode array 2B / W to the outside. is there.

In the case of the fourth embodiment, instead of the monochrome odd-numbered CCD analog shift register 4B / WO in the first embodiment, the accumulated charge of the smallest photodiode among the odd-numbered ones is transferred. CC to which the accumulated charges of the CCD analog shift register 4B / WOS and the photodiode of the largest of the odd number are transferred
A D analog shift register 4B / WOB is provided, and instead of the monochrome even-numbered CCD analog shift register 4B / WE in the first embodiment, the smallest photodiode of the even-numbered photodiodes is stored. CCD analog shift register 4B to which charges are transferred
/ WES and a CCD analog shift register 4B / WEB to which the accumulated charges of the even-numbered and largest photodiode are transferred.

The four CCD analog shift registers 4B / WOS, 4B / WOB, 4B / WES and 4B are used.
In response to the provision of / WEB, four reset gates 5B / WOS, 5B / WOB, 5B / WES and 5 are provided.
B / WEB and 4 clamp circuits 6B / WOS, 6B
/ WOB, 6B / WES and 6B / WEB and four amplifiers 7B / WOS, 7B / WOB, 7B / WES and 7
B / WEB is provided.

As described above, the one-dimensional image sensor device 11-4 according to the fourth embodiment has a structure for outputting the accumulated charges of the monochrome photodiode array 2B / W to the outside. Although it has a 4-channel configuration, the operation of the read image signal processing system after the analog processing circuit 12 is almost the same as that of the first embodiment.

Unlike the first embodiment, the analog processing circuit 12 and the analog / digital conversion circuit 13 have a 4-channel processing system for monochrome signals. In addition, the monochrome output (B / W1 output to B / W output 4) from the one-dimensional image sensor device 11-4 of the fourth embodiment is an odd ascending order and a descending order and an even ascending order as shown in FIG. Since it is in the descending order, the analog / digital conversion circuit 13 integrates the converted 4-channel monochrome signals into a 1-channel monochrome signal in consideration of the arrangement order.

Also according to the one-dimensional image sensor device 11-4 of the fourth embodiment and the image reading device to which the one-dimensional image sensor device 11-4 is applied,
The same effect as that of the first embodiment can be obtained.

(E) Fifth Embodiment Next, a fifth embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device of the fifth embodiment will be described focusing on the differences from the first and fourth embodiments.

FIG. 15 is a block diagram showing the structure of the one-dimensional image sensor device 11-5 of the fifth embodiment.
2 according to the first embodiment and FIG. 1 according to the fourth embodiment.
3 are designated by the same reference numerals.

The position of the one-dimensional image sensor device 11-5 of the fifth embodiment with respect to the entire image reading device is the same as that of the one-dimensional image sensor device 11-1 of the first embodiment, as shown in FIG. It is the position shown in.

The one-dimensional image sensor device 11-5 of the fifth embodiment has a photodiode surface for each of the three primary colors R, G, B of the photodiode array 2R, 2G, 2B, and a monochrome photodiode. The relationship with the light-receiving surface of each photodiode of the array 2B / W is the same as in the first embodiment.

Similarly to the fourth embodiment, the one-dimensional image sensor device 11-5 of the fifth embodiment has a configuration for outputting the accumulated charges of the monochrome photodiode array 2B / W to the outside. It has a 4-channel configuration.

The one-dimensional image sensor device 11-5 of the fifth embodiment has a structure for outputting the accumulated charges of the photodiode arrays 2R, 2G, 2B for the three primary colors R, G, B to the outside. The difference from the fourth embodiment is that a 2-channel configuration is applied. The applied 2-channel configuration is the photodiode array 2R, 2
This is not a two-channel configuration in which the odd and even numbers of G and 2B are divided, but a two-channel configuration in which the arrangement order is smaller or larger.

As CCD analog shift registers for the three primary colors R, G, and B, CCD analog shift registers 4RS, 4GS, and 4BS to which the accumulated charges of the photodiode having the smallest arrangement order are transferred, and the CCD analog shift registers having the largest arrangement order. CCD analog shift registers 4RB, 4GB, 4BB to which the charges accumulated in the photodiodes are transferred are provided, and the shift gates 3R, 3G, 3B operate in common for two channels.

Two CCDs for each of the three primary colors R, G, B
Analog shift register 4RS, 4GS, 4BS, 4R
Reset gates 5RS, 5GS, 5BS, 5RB, 5GB, 5BB corresponding to B, 4GB, and 4BB, respectively.
And clamp circuits 6RS, 6GS, 6BS, 6RB, 6
GB, 6BB and amplifiers 7RS, 7GS, 7BS, 7R
B, 7 GB, and 7BB are provided.

As described above, the one-dimensional image sensor device 11-5 according to the fifth embodiment has a structure for outputting the accumulated charges of the monochrome photodiode array 2B / W to the outside. Unlike the first embodiment, it has a four-channel configuration, and the configuration for outputting the charges accumulated in the photodiode arrays 2R, 2G, and 2B for the three primary colors R, G, and B to the outside has two channels. Although configured, the operation of the read image signal processing system after the analog processing circuit 12 is almost the same as that of the first embodiment.

Unlike the first embodiment, the analog processing circuit 12 and the analog / digital conversion circuit 13 have a 2-channel processing system for each of the signals of the three primary colors R, G, B, and for the monochrome signal. It has a 4-channel processing system. Further, since the output from the one-dimensional image sensor device 11-5 of the fifth embodiment is as shown in FIG. 16, the analog / digital conversion circuit 13 is
The converted 2-channel primary color signals are integrated into the 1-channel primary color signal in consideration of the arrangement order shown in FIG. 16, and the converted 4-channel monochrome signals are shown in FIG.
Considering the arrangement order shown in (1), they are integrated into one-channel monochrome signal.

Also according to the one-dimensional image sensor device 11-5 of the fifth embodiment and the image reading device to which the one-dimensional image sensor device 11-5 is applied,
The same effect as that of the first embodiment can be obtained.

In addition to this, since the reading from the one-dimensional image sensor device 11-5 is executed for a plurality of channels for each photodiode array, it is possible to expect a high reading speed.

(F) Sixth Embodiment Next, a sixth embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device of the sixth embodiment will be described focusing on the differences from the first embodiment.

FIG. 17 is a block diagram showing the structure of the one-dimensional image sensor device 11-6 of the sixth embodiment.
The same or corresponding portions as those in FIG. 2 according to the first embodiment are designated by the same or corresponding reference numerals.

The one-dimensional image sensor device 11-6 of the sixth embodiment is similar to the one-dimensional image sensor device 11-1 of the first embodiment in that the position of the image reading device with respect to the entire image reading device is the same as that of the above-described FIG. It is the position shown in.

The one-dimensional image sensor device 11-6 of the sixth embodiment is also the photodiode array for the three primary colors R, G, B, the light-receiving surface of each photodiode of the photodiode arrays 2R, 2G, 2B, and the monochrome photodiode. The relationship with the light-receiving surface of each photodiode of the array 2B / W is the same as in the first embodiment.

In the one-dimensional image sensor device 11-6 of the sixth embodiment, the structure for color (three primary colors R, G, B) and the structure for monochrome are independently formed on the same chip. Is.

The configuration for colors (three primary colors R, G, B) is
Since it is similar to the first embodiment, its description is omitted.

The monochrome structure is different from that of the first embodiment. That is, shift gate 3B / W, CCD
Analog shift register 4B / W, reset gate 5B
/ W, clamp circuit 6B / W and amplifier 7B / W are 1
It belongs to the channel.

Further, the clock (clock 1) to the monochrome CCD analog shift register 4B / W and the CCD analog shift register 4R for the three primary colors R, G and B,
The clock (clock 2) to 4G and 4B can be arbitrarily given independently from the outside (timing generation circuit 19) of the one-dimensional image sensor device 11-6.

Since the monochrome output has a one-channel configuration, the monochrome processing system in the analog processing circuit 12 and the analog / digital conversion circuit 13 need only be one channel, and the analog / digital conversion circuit 13 has a plurality of monochrome channels. There is also no processing to integrate.

In the one-dimensional image sensor device 11-6 of the sixth embodiment, the color (three primary colors R, G, B) configuration is independent of the monochrome configuration, so an image incorporating it is provided. The reader can be designed as desired.

For example, in the color mode, only the signals of the three primary colors R, G, B from the one-dimensional image sensor device 11-6 are processed, and in the monochrome mode, the monochrome signal from the one-dimensional image sensor device 11-6 is processed. It can also be configured to process only. In this case, the color signal correction circuit 16 is omitted.

Further, for example, as shown in FIG. 18, in the color mode, the reading speed of the signals of the three primary colors R, G, B in the main scanning direction is set to 1/2 of the reading speed of the monochrome signal in the main scanning direction. It can also be configured as follows. Here, depending on the selection of the clock cycle, the shading correction circuit 14 and the subsequent circuits can be configured exactly the same as in the first embodiment.

Further, for example, even in the color mode having the function of increasing the resolution of the color signal by using the information of the monochrome signal, first, only the monochrome signal is read and then the color signal (three primary color signals) is read. It is also possible to use a one-time reading method.

In the one-dimensional image sensor device 11-6 of the sixth embodiment, the configuration for color (three primary colors R, G, B) and the configuration for monochrome are independent. The degree of freedom can be increased. The same effect as that of the first embodiment can be obtained depending on the design contents.

(G) Seventh Embodiment Next, a seventh embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device according to the seventh embodiment will be described, focusing on the differences from the first embodiment.

FIG. 19 is a block diagram showing the structure of the one-dimensional image sensor device 11-7 of the seventh embodiment.
The same or corresponding portions as those in FIG. 2 according to the first embodiment are designated by the same or corresponding reference numerals.

The position of the one-dimensional image sensor device 11-7 of the seventh embodiment with respect to the entire image reading device is the same as that of the one-dimensional image sensor device 11-1 of the first embodiment, as shown in FIG. It is the position shown in.

In the one-dimensional image sensor device 11-7 of the seventh embodiment, the photodiode arrays 2R, 2G, 2B for the three primary colors R, G, B as well as the monochrome photodiode array 2B / W are The number of photodiodes (number of pixels) in the main scanning direction is the same, and the length of the light receiving surface of each photodiode in the main scanning direction is the same.

On the other hand, the lengths of the light receiving surfaces of the photodiodes in the four types of photodiode arrays 2R, 2G, 2B, and 2B / W in the sub-scanning direction are different.
That is, the length in the sub-scanning direction is selected according to the sensitivity of the light receiving surface (light receiving portion) of each photodiode, including the transmission characteristics of the color filter (not shown). Figure 1
In the example shown in FIG. 9, monochrome is not provided with a color filter, and thus monochrome has the highest sensitivity. Therefore, the length in the sub-scanning direction on the light-receiving surface of the monochrome photodiode is the shortest. The length in the sub-scanning direction is the shortest in the order of sensitivity (as an example), that is, green (G), red (R), and blue (B).

As described above, although the four types of photodiodes have different lengths in the sub-scanning direction, the one-dimensional image sensor device 11-7 of the seventh embodiment also has
In the sub-scanning direction, as shown in FIG. 20, the photodiodes 2R, 2G, 2B, and 2B / W are arranged such that the distance between the center lines (shown by the alternate long and short dash lines) of each photodiode array is an integral multiple of the reading pitch. ing.

In the one-dimensional image sensor device 11-7 of the seventh embodiment, the photodiode array (pixel number) of the photodiode arrays 2R, 2G, 2B for the three primary colors R, G, B is monochrome. Since it is equal to the number of photodiodes (the number of pixels) of the photodiode array 2B / W for monochrome, the photodiode array 2B / W for monochrome is used.
Similar to the output structure of the accumulated charge of, the output structure of the accumulated charges of the photodiode arrays 2R, 2G, and 2B for the three primary colors R, G, and B adopts the two-channel configuration for each odd-numbered and even-numbered photodiode. is doing.

That is, for each primary color signal, the two-channel shift gates 3RO, 3GO, 3BO, 3RE, 3
GE, 3BE, CCD analog shift register 4RO,
4GO, 4BO, 4RE, 4GE, 4BE, reset gates 5RO, 5GO, 5BO, 5RE, 5GE, 5B
E, clamp circuits 6RO, 6GO, 6BO, 6RE, 6
GE, 6BE, and amplifiers 7RO, 7GO, 7BO,
7RE, 7GE, and 7BE are provided.

FIG. 21 is a timing chart showing the operation of the one-dimensional image sensor device 11-7 of the seventh embodiment. The case where the number of pixels in the main scanning direction is 7500 is shown.

Gate control signals SH-R, SH-G for the three primary colors R, G, B, which are given from the timing generation circuit 19 (see FIG. 1) to the one-dimensional image sensor device 11-7.
SH-B is also a monochrome gate control signal SH-B / W.
Is the same, and as shown in FIG.
CD analog shift register 4RO, 4GO, 4BO,
The clocks for 4RE, 4GE, and 4BE are common.

Therefore, signals of two channels are output in parallel at the same timing for color and monochrome (B / W output 1, B / W output 2, R output 1, R output 2, G output 1, G output). 2, B output 1, B output 2).

In the image reading device to which the one-dimensional image sensor device 11-7 of the seventh embodiment is applied,
The operation of the read image signal processing system after the analog processing circuit 12 is almost the same as that of the first embodiment, except for the following points.

The analog processing circuit 12 and the analog / digital conversion circuit 13 have a 2-channel processing system for each of the signals of the three primary colors R, G, and B, and the analog / digital conversion circuit 13 has a converted 2-channel processing system. The primary color signals are integrated into one-channel primary color signal in consideration of the arrangement order shown in FIG. The processing on the monochrome signal in the analog processing circuit 12 and the analog / digital conversion circuit 13 is the same as that in the first embodiment.

In addition, the inter-line correction circuit 15 considers the difference in the positions of the photodiode arrays for the three primary colors R, G, B and the photodiode array for monochrome in the sub-scanning direction, and the shading correction circuit 14. The output signal from the one-dimensional image sensor device 11-7 is converted into a signal when the lines of the three primary colors R, G, B and the monochrome are matched in the sub-scanning direction, and is output. And the number of lines in the sub-scanning direction of the monochrome output match, the line-to-line correction circuit 15 determines the number of lines (resolution) in the sub-scanning direction for color output, unlike the first embodiment. The interpolation processing for doubling is not executed.

In the case of the seventh embodiment, the main scanning directions of color and monochrome at the stage of output from the line correction circuit 15 (the stage of output from the one-dimensional image sensor device 11-7, if traced back) Since the number of pixels in the sub-scanning direction is the same, the color signal correction circuit 16 is omitted.

Even if the light receiving area of the photodiode is changed depending on the light receiving component, the dynamic level (gradation) of the accumulated charge of the photodiode regarding color is considerably higher than the dynamic level of the accumulated charge (gradation) of the photodiode regarding monochrome. If small, analog /
The number of bits of the digital signal from the digital conversion circuit 13 may be changed between color and monochrome. For example, the analog / digital conversion circuit 13 uses the three primary colors R,
G and B are converted into 4-bit digital signals, and monochrome is converted into 8-bit digital signals.

As described above, when the number of bits of the digital signal differs between color and monochrome, the color signal correction circuit 16 having the structure shown in FIG. 23 can be applied. Note that, in FIG. 23, the same or corresponding portions as those in FIG. 5 according to the above-described first embodiment are denoted by the same or corresponding reference numerals. Further, FIG. 24 is an explanatory diagram of processing of the color signal correction circuit 16 shown in FIG.

The color signal correction circuit 16 shown in FIG.
It is a gradation correction circuit, not resolution, and performs correction for increasing the gradation of color signals by using the information of monochrome signals.

In FIG. 23, the color signal correction circuit 16
Is a CrCb calculation circuit 30 and an RGB resolution correction circuit 31.
And a parameter storage memory 32.

From the interline correction circuit 15 to the color signal correction circuit 16, 8-bit monochrome pixel data K (i,
j) and 4-bit 3-primary color pixel data R (k, j), G
(K, j) and B (k, j) are input in a raster scan pattern for the original.

The CrCb calculation circuit 30 inputs these four types of input pixel data and the parameters ar0, ag0, ab0, ar1, ag1, a stored in the parameter storage memory 32.
Using b1, YCrCb shown in equations (11) to (13)
After conversion, the 8-bit luminance signal (Y), the first color difference signal (Cr: RY component), and the second color difference signal (Cb:
(BY component).

Y (i, j) = K (i, j) (11) Cr (i, j) = ar0R (i, j) + ag0G (i, j) + ab0B (i, j) ... (12) Cb (K, j) = ar1R (i, j) + ag1G (i, j) + ab1B (i, j) (13) Further, the RGB resolution correction circuit 31 includes parameters br0, br1 stored in the parameter storage memory 32. , Bb
0 and bb1 are used to comply with the equations (14) to (16), R
An 8-bit three primary colors R ′, G ′, and B ′ having an increased gradation are obtained by executing the inverse GB conversion.

R ′ (i, j) = K (i, j) + br0Cr (i, j) (14) G ′ (i, j) = K (i, j) + br1Cr (k, j) + bb1Cr (k) , J) (15) B ′ (i, j) = K (i, j) + bb0Cr (i, j) (16) As is well known, the three primary color signals are the luminance signal (Y = K), The first color difference signal (Cr) and the second color difference signal (Cb) can be converted, and conversely, the luminance signal (Y = K), the first color difference signal (Cr), and the second color difference signal (Cb) are reversed. Can be converted into three primary color signals.

The color signal correction circuit 16 shown in FIG.
Converts a 4-bit 3-primary color signal into an 8-bit 3-primary color signal by sequentially performing YCrCb conversion and RGB reverse conversion.

According to the one-dimensional image sensor device 11-7 of the seventh embodiment and the image reading device to which the one-dimensional image sensor device 11-7 is applied,
The same effect as that of the first embodiment can be obtained.

The one-dimensional image sensor device 11-7
Although the miniaturization and cost reduction may be inferior to the first embodiment, a sufficient effect can be expected as compared with the conventional 3-line CCD device 1-3. Further, since the light receiving area of the photodiode is determined in consideration of the sensitivity of the photodiode for each primary color signal, further improvement in color image quality can be expected.

(H) Eighth Embodiment Next, an eighth embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device according to the eighth embodiment will be described, focusing on the differences from the seventh embodiment.

The structure of the one-dimensional image sensor device 11-8 of the eighth embodiment can also be represented by FIG. 19 used in the description of the seventh embodiment.

The difference from the seventh embodiment is that the length of the light receiving surface of the photodiode for each primary color signal in the sub-scanning direction is taken into consideration not only the sensitivity of the light receiving surface (light receiving portion) but also the following points. It is a point that has been selected.

In the case of the eighth embodiment, the gate control signal from the timing generation circuit 19 (see FIG. 1) is supplied every time the monochrome gate control signal SH-B / W is generated twice.
Gate control signals SH-R, SH-G, SH-B of three primary colors
Occurs once. That is, while the monochrome signal is obtained for two lines in the sub-scanning direction, the color signal is obtained for two lines in the sub-scanning direction.

The length in the sub-scanning direction of the light-receiving surface of the photodiode for each primary color signal is selected in consideration of such differences in photoelectric conversion and charge storage time.

When the number of lines (resolution) in the sub-scanning direction is different, it is conceivable that the inter-line correction circuit 15 performs conversion to double density in the sub-scanning direction. This eighth embodiment Then, the color signal correction circuit 16 performs conversion to double density in the sub-scanning direction. The color signal correction circuit 16 of the eighth embodiment uses the information of the monochrome signal to generate a color signal (three primary color signals).
It is intended to increase the resolution in the sub-scanning direction.

FIG. 25 is a block diagram showing the detailed structure of the color signal correction circuit 16 of the eighth embodiment, and FIG.
FIG. 3 is a schematic explanatory diagram of the processing of the color signal correction circuit 16. Note that, in FIG. 25, the same or corresponding portions as those in FIG. 5 according to the first embodiment are denoted by the same or corresponding reference numerals. In addition, the color signal correction circuit 1 of the eighth embodiment
It is assumed that the monochrome signal and the color signal having the same number of bits are input to the input terminal 6.

In FIG. 25, the color signal correction circuit 16 of the eighth embodiment has a CrCb calculation circuit 30, an RGB resolution correction circuit 31, a parameter storage memory 32, a line memory 36, and a data selector 35.

Here, the line-to-line correction circuit 15 of the eighth embodiment has the monochrome pixel data K having the relationship shown in FIGS. 26A and 26B with the color signal correction circuit 16.
(I, 2k) and K (i, 2k + 1) and the three primary color pixel data R (i, k), G (i, k), and B (i, k) are input in parallel. For monochrome pixel data, two lines of K (i, 2k) and K (i, 2k + 1)
Simultaneous input of line memory 1 in line correction circuit 15
Although FIG. 25 shows a case where the function of 5A is performed, the color signal correction circuit 16 is provided with a line memory corresponding thereto, and monochrome pixel data K (i, 2k) and K (i, 2k + 1) for two lines are obtained. You may get it.

The CrCb calculation circuit 30 inputs these four types of input pixel data and the parameters ar0, ag0, ab0, ar1, ag1, a stored in the parameter storage memory 32.
Using b1, YCrCb shown in equations (17) to (20)
It is a conversion.

Y (i, 2k) = K (i, 2k) (17) Y (i, 2k + 1) = K (i, 2k + 1) (18) Cr (i, k) = ar0R (i, k) + Ag0G (i, k) + ab0B (i, k) ... (19) Cb (i, k) = ar1R (i, k) + ag1G (i, k) + ab1B (i, k) ... (20) RGB resolution correction circuit 31 Is the parameter storage memory 3
Parameters br0, br1, bb0, bb1 stored in 2
Is used to perform RGB inverse conversion according to equations (21) to (26) to obtain three primary colors R ′, G ′, and B ′ with increased resolution (number of pixels) in the sub-scanning direction. is there.

R ′ (i, 2k) = K (i, 2k) + br0Cr (i, k) (21) G ′ (i, 2k) = K (i, 2k) + br1Cr (i, k) + bb1Cr (i) , K) (22) B '(i, 2k) = K (i, 2k) + bb0Cr (i, k) ... (23) R' (i, 2k + 1) = K (i, 2k + 1) + br0Cr (i, k) ) (24) G '(i, 2k + 1) = K (i, 2k + 1) + br1Cr (i, k) + bb1Cr (i, k) ... (25) B' (i, 2k + 1) = K (i, 2k + 1) + bb0Cr (I, k) (26) As is well known, the luminance signal (Y = K), the first color difference signal (Cr) and the second color difference signal (Cb) are converted into the three primary color signals R ′, G ′, B. Can be converted to '. In the eighth embodiment, the number of pixels of the luminance signal (Y = K) in the sub-scanning direction is twice the number of pixels of the first color difference signal (Cr) and the second color difference signal (Cb) in the main scanning direction. Is used, the number of pixels in the sub-scanning direction in the converted three primary color signals R ′, G ′, and B ′ is set to be the same as the number of pixels in the luminance signal (Y = K) before conversion. .

The equations (21) to (23) described above are equations for calculating the data of the pixel positions of the even lines in the converted three primary color signals R ', G', B ', and the equation (24) described above. ~ (26) is the converted three primary color signals R ', G', B '
3 is a calculation formula of data of pixel positions on odd lines in FIG.

The RGB resolution correction circuit 31 receives the three primary color signals R '(i, 2k) at the pixel positions of the obtained even lines,
G '(i, 2k) and B' (i, 2k) are given to the data selector 35 as a first selection input, and the obtained three primary color signals R '(i, 2k +) at the pixel positions of the odd lines are given.
1), G '(i, 2k + 1), B' (i, 2k + 1)
Is delayed by one sub-scanning period via the line memory 36 and supplied to the data selector 35 as a second selection input. Note that in FIG. 25, the luminance signal, that is, the monochrome signals K (i, 2k) and K (i,
2k + 1) is output from the color signal correction circuit 16.

The data selector 35 receives R '(i, 2k + 1), G for odd-numbered lines in response to the odd-even identification signal (expressed as Odd / Even line identification signal in FIG. 25) of the sub-scanning line from the timing generation circuit 19. '(I, 2k +
1), B '(i, 2k + 1) are selected, and R' (i, 2k), G '(i, 2k), B' (i, 2) are selected for even lines.
k) is selected and output.

Also according to the one-dimensional image sensor device 11-8 of the eighth embodiment and the image reading device to which the one-dimensional image sensor device 11-8 is applied,
The same effect as that of the first embodiment can be obtained.

(I) Ninth Embodiment Next, a ninth embodiment of the one-dimensional image sensor device and the image reading device according to the present invention will be briefly described with reference to the drawings. Hereinafter, the one-dimensional image sensor device and the image reading device according to the ninth embodiment will be described, focusing on the differences from the first embodiment.

FIG. 27 is a block diagram showing the structure of the one-dimensional image sensor device 11-9 of the ninth embodiment.
The same or corresponding portions as those in FIG. 2 according to the first embodiment are designated by the same or corresponding reference numerals.

The one-dimensional image sensor device 11-9 of the ninth embodiment also has the same position as that of the one-dimensional image sensor device 11-1 of the first embodiment as shown in FIG. It is the position shown in.

In the one-dimensional image sensor device 11-9 of the ninth embodiment, the number of photodiodes (number of pixels) of the photodiode arrays 2R, 2G, 2B for the three primary colors R, G, B in the main scanning direction is , The number of photodiodes (pixels) in the main scanning direction of the monochrome photodiode array 2B / W is set to 2/3, and therefore, the main scanning of the light receiving surface of the photodiodes for the three primary colors R, G, and B is performed. The length in the direction is 3/2 times the length in the main scanning direction of the light receiving surface of the monochrome photodiode. For example, in the main scanning direction, the color is 5000 pixels (400 dp
i), monochrome can be applied to an image reading apparatus having 7500 pixels (600 dpi).

Depending on the difference in the length in the main scanning direction of the light receiving surface of the photodiode for the three primary colors R, G, B and for monochrome, the photodiodes for the three primary colors R, G, B are also provided in the sub scanning direction. The light-receiving surface of is longer than that for monochrome.

The output structure of the accumulated charges of the photodiode array is the same for the three primary colors R, G, B and for monochrome.

That is, for each primary color signal and monochrome signal, the shift gates 3R, 3G, 3 for each channel are provided.
B, 3B / W, CCD analog shift register 4R, 4
G, 4B, 4B / W, reset gates 5R, 5G, 5
B, 5B / W, clamp circuits 6R, 6G, 6B, 6B /
W and amplifiers 7R, 7G, 7B, 7B / W are provided.

FIG. 28 is a timing chart showing the operation of the one-dimensional image sensor device 11-9 of the ninth embodiment.

Gate control signals SH-R, SH-G for the three primary colors R, G, B, which are given from the timing generation circuit 19 (see FIG. 1) to the one-dimensional image sensor device 11-9.
SH-B is also a monochrome gate control signal SH-B / W.
Is also the same, and as shown in FIG. 28, C
CD analog shift register 4RO, 4GO, 4BO,
The clocks for 4RE, 4GE, and 4BE are common. That is, the resolution in the main scanning direction (the number of pixels; the number of photodiodes) for the three primary colors R, G, B and monochrome
However, they are driven simultaneously.

As described above, the clocks are common for the three primary colors R, G, B and monochrome, but the reset gates 5R, 5G, 5B, 5B / W and the clamp circuits 6R, 6 are used.
By adjusting the control signals given to G, 6B, and 6B / W, the effective pixel area can be made different between the three primary colors R, G, and B and in other words, in other words, in accordance with the resolution. it can.

In the image reading device to which the one-dimensional image sensor device 11-9 of the ninth embodiment is applied,
The operation of the read image signal processing system after the analog processing circuit 12 is almost the same as that of the first embodiment, except for the following points.

The interline correction circuit 15 uses the three primary colors R, G,
In consideration of the difference in the positions of the B photodiode array and the monochrome photodiode array in the sub scanning direction, the three primary colors R, G, and The signal is converted into a signal when B and monochrome lines are matched, and is output. However, since the number of lines in the sub-scanning direction of the color output from the one-dimensional image sensor device 11-9 and the monochrome output are the same, Unlike the first embodiment, the line-to-line correction circuit 15 determines the number of lines (resolution) in the sub-scanning direction for color output.
Is not executed.

The color signal correction circuit 16 uses the information of the monochrome signal in the main scanning direction to determine the three primary colors R,
Increase the resolution of G and B signals. Also in this case, YCrC
The resolution is increased by sequentially performing b conversion and RGB reverse conversion,
Since the monochrome 3 pixel section and the color 2 pixel section match, they are taken into consideration when performing the RGB inverse conversion.

For example, Y as shown in FIG.
In case of (K), Cr, Cb, 3 for the pixel position of K1
The primary colors R1, G1, and B1 are obtained by inverse conversion with respect to K1, Cr1, and Cb1, and the three primary colors R2 for the pixel position of K2,
G2 and B2 are K2, (Cr1 + Cr2) / 2, (Cb
1 + Cb2) / 2 is obtained by inverse transformation, and the three primary colors R1, G1, and B1 for the pixel position of K3 are K3, Cr3,
It is obtained by the inverse transformation for Cb3.

According to the one-dimensional image sensor device 11-9 of the ninth embodiment and the image reading device to which the one-dimensional image sensor device 11-9 is applied,
The same effect as that of the first embodiment can be obtained.

(J) Other Embodiments In the above description, various modified embodiments have been mentioned.
Further, there may be modified embodiments as exemplified below.

The image reading apparatus of each of the above embodiments shows the case where the moving speed in the sub-scanning direction is the same in both the color mode for reading a color original document and the monochrome mode for reading a monochrome original document. Can be applied. That is, the one-dimensional image sensor device of the present invention can be incorporated in an image reading device in which the moving speed in the sub-scanning direction is different between the color mode and the monochrome mode.

In each of the above embodiments, the one-dimensional image sensor device has the monochrome photodiode array. However, even if the monochrome photodiode array is not provided, the technical concept of the present invention will be described. Can be applied. For example, the light receiving area of the photodiodes of the three primary colors R, G, and B may be changed depending on the sensitivity or the like.

Furthermore, in the above description, the one-dimensional image sensor device is described as being composed of one chip, but it may be composed of a plurality of chips.

Furthermore, in each of the above embodiments,
Although a monochrome signal is output also in the color mode, only the signals of the three primary colors R, G and B may be output from the one-dimensional image sensor device in the color mode.

In the above description, the color signal correction circuit uses the information of the monochrome signal to perform resolution conversion in one of the main scanning direction and the sub scanning direction, but in the main scanning direction and the sub scanning direction. Both resolution conversions may be performed. For example, when the light receiving surface of the color photodiode is twice as large in the main scanning direction and the sub scanning direction as in the first embodiment, first, the information of the monochrome signal is supplied in the sub scanning direction. May be used for doubling the density, and then using the information of the monochrome signal in the main scanning direction.

Further, the information of the monochrome signal required by the color signal correction circuit may be obtained by a reading operation different from the reading operation for obtaining the color signal. In other words, the monochrome signal and the color signal may be separately obtained by reading the original twice.

Furthermore, in the above description, the color signal correction circuit has been shown to perform YCrCb conversion and RGB inverse conversion in order. However, the formula for YCrCb conversion and the formula for RGB inverse conversion are rearranged, and YCrCb conversion is performed. It is also possible to obtain an expression that integrates the conversion and the inverse RGB conversion, and according to that, perform the YCrCb conversion and the inverse RGB conversion integrally. In addition,
The color signal correction circuit may be configured by hardware or software.

The light receiving element that performs photoelectric conversion is not limited to the photodiode, and may be another photoelectric conversion element. The shift register is not limited to the CCD configuration.

Furthermore, the one-dimensional image sensor device of each of the above-described embodiments uses the three primary color signals (R,
Although G, B) are output, the present invention can be applied to those that output a combination of other color components such as yellow, cyan, and magenta.

[0218]

As described above, according to the present invention, the size and cost of the one-dimensional image sensor device, the monochrome image quality,
It is possible to realize a one-dimensional image sensor device and an image reading device that can improve the evaluation of a plurality of evaluation items such as color image quality, speed in the sub-scanning direction in the color mode, and through-pass read characteristics, which are higher than those of the related art.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an image reading apparatus according to a first embodiment.

FIG. 2 is a block diagram showing a detailed configuration of the one-dimensional image sensor device of the first embodiment.

FIG. 3 is an explanatory diagram of an arrangement position of each photodiode array in the sub-scanning direction of the one-dimensional image sensor device of the first embodiment.

FIG. 4 is a timing chart showing an outline of output from the one-dimensional image sensor device of the first embodiment.

FIG. 5 is a block diagram showing a configuration of a color signal correction circuit according to the first embodiment.

FIG. 6 is an explanatory diagram showing an outline of processing of a color signal correction circuit according to the first embodiment.

FIG. 7 is a timing chart (1) showing the operation of the one-dimensional image sensor device of the first embodiment.

FIG. 8 is a timing chart (2) showing the operation of the one-dimensional image sensor device of the first embodiment.

FIG. 9 is a block diagram showing a detailed configuration of a one-dimensional image sensor device according to a second embodiment.

FIG. 10 is a timing chart showing the operation of the one-dimensional image sensor device of the second embodiment.

FIG. 11 is a block diagram showing a detailed configuration of a one-dimensional image sensor device according to a third embodiment.

FIG. 12 is a timing chart showing an outline of output from the one-dimensional image sensor device of the third embodiment.

FIG. 13 is a block diagram showing a detailed configuration of a one-dimensional image sensor device according to a fourth embodiment.

FIG. 14 is a timing chart showing an outline of output from the one-dimensional image sensor device of the fourth embodiment.

FIG. 15 is a block diagram showing a detailed configuration of a one-dimensional image sensor device according to a fifth embodiment.

FIG. 16 is a timing chart showing an outline of output from the one-dimensional image sensor device of the fifth embodiment.

FIG. 17 is a block diagram showing a detailed configuration of a one-dimensional image sensor device of a sixth embodiment.

FIG. 18 is a timing chart showing an operation example of the one-dimensional image sensor device of the sixth embodiment.

FIG. 19 is a block diagram showing a detailed configuration of a one-dimensional image sensor device of a seventh embodiment.

FIG. 20 is an explanatory diagram of the arrangement position of each photodiode array in the sub-scanning direction of the one-dimensional image sensor device of the seventh embodiment.

FIG. 21 is a timing chart showing the operation of the one-dimensional image sensor device of the seventh embodiment.

FIG. 22 is a timing chart showing an outline of output from the one-dimensional image sensor device of the seventh embodiment.

FIG. 23 is a block diagram showing an example of a color signal correction circuit in an image reading device to which the one-dimensional image sensor device of the seventh embodiment is applied.

FIG. 24 is an explanatory diagram showing an outline of processing of the color signal correction circuit of FIG. 23.

FIG. 25 is a block diagram showing a color signal correction circuit according to an eighth embodiment.

FIG. 26 is an explanatory diagram showing an outline of processing of a color signal correction circuit according to an eighth embodiment.

FIG. 27 is a timing chart showing the operation of the one-dimensional image sensor device of the ninth embodiment.

FIG. 28 is a timing chart showing the operation of the one-dimensional image sensor device of the ninth embodiment.

FIG. 29 is an auxiliary explanatory diagram of the processing of the color signal correction circuit of the ninth embodiment.

FIG. 30 is a block diagram showing a first example of a conventional one-dimensional image sensor device.

FIG. 31 is a block diagram showing a second example of a conventional one-dimensional image sensor device.

[Explanation of symbols]

2 ... Photodiode array, 10 ... Image reading device, 11-1 to 11-9 ... One-dimensional image sensor device, 16 ... Color signal correction circuit.

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[Submission date] September 17, 2001 (2001.9.1)
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Continued front page    (72) Inventor Yoshikatsu Kamisuwa             70, Yanagimachi, Saiwai-ku, Kawasaki City, Kanagawa Prefecture             Ku Yanagimachi Office (72) Inventor Kunihiko Miura             70, Yanagimachi, Saiwai-ku, Kawasaki City, Kanagawa Prefecture             Ku Yanagimachi Office F-term (reference) 4M118 AA10 AB01 BA10 CA19 FA08                       GC08 GC09 GC15                 5B047 AA01 AB04 BB02 BC01 CA05                       CA06 CB17                 5C051 AA01 BA03 DA03 DB01 DE02                       DE19                 5C072 AA01 BA15 BA19 EA05 QA09                       UA13 UA17 UA18

Claims (15)

[Claims] 1. A plurality of light receiving element arrays in which a plurality of light receiving elements for photoelectrically converting reflected light from an original are arranged in the main scanning direction, and all or some of the light receiving element arrays are serially converted into electric signals by photoelectric conversion. In the one-dimensional image sensor device for outputting to, the light-receiving area of at least one light-receiving element array is different from the light-receiving area of the other light-receiving element array. . 2. The light receiving element of the light receiving element array having a light receiving area different from that of the other light receiving elements has a different length in the main scanning direction as compared with the light receiving elements of the other light receiving element arrays. The one-dimensional image sensor device according to item 1. 3. The light receiving element of the light receiving element array having a light receiving area different from that of the other light receiving elements has a different length in the sub-scanning direction as compared with other light receiving elements of the light receiving element array. The one-dimensional image sensor device according to item 1. 4. A light-receiving element of the above-mentioned light-receiving element array having a light-receiving area different from that of the other light-receiving elements has different lengths in the main scanning direction and the sub-scanning direction as compared with the light-receiving elements of the other light-receiving element array. The one-dimensional image sensor device according to claim 1. 5. The one-dimensional image sensor device according to claim 1, wherein the light receiving area of the light receiving element is determined according to the sensitivity of the light receiving element with respect to the light component in charge. 6. A light receiving element array for monochrome and a plurality of light receiving element arrays for different color components for color are provided.
Dimensional image sensor device. 7. The light receiving area of the light receiving element of the monochrome light receiving element array is different from the light receiving area of the light receiving element of each of the color light receiving element arrays.
The one-dimensional image sensor device according to item 1. 8. The one according to claim 6, wherein the number of light receiving elements of the monochrome light receiving element array is larger than the number of light receiving elements of the color light receiving element array. Dimensional image sensor device. 9. The one according to claim 8, wherein the number of light receiving elements of the monochrome light receiving element array is an integral multiple of the number of light receiving elements of the color light receiving element array. Dimensional image sensor device. 10. An output configuration capable of serially outputting, in parallel, an electrical signal obtained by photoelectric conversion of the light-receiving element array for monochrome and an electrical signal obtained by photoelectric conversion of the light-receiving element array for color. Claim 6 ~
9. The one-dimensional image sensor device according to any one of 9. 11. The method according to claim 6,
An image reading apparatus having a three-dimensional image sensor device, wherein the one-dimensional image sensor device outputs a monochrome signal in addition to a color signal in a color mode for reading a color original. 12. The image reading apparatus according to claim 11, further comprising a color signal correction circuit for improving the image quality of the color signal by using the information of the monochrome signal. 13. The image reading apparatus according to claim 12, wherein the color signal correction circuit performs correction for increasing resolution of a color signal in a main scanning direction and / or a sub scanning direction. 14. The color signal correction circuit performs correction for increasing the gradation of a color signal.
2. The image reading device described in 2. 15. The color signal comprises signals of three primary colors R, G and B, and the color signal correction circuit comprises three primary colors R, G and B.
G and B signals and monochrome signals are converted into data representing color characteristics, and RGB inverse conversion is performed to convert the converted data representing color characteristics into signals of the three primary colors R, G, and B again. 15. The image reading apparatus according to claim 12, wherein the image quality of the color signal is improved through the.