JPH08248302A - Automatic focus detector - Google Patents

Abstract

PURPOSE: To provide an automatic focus detector capable of efficiently detecting the high frequency component of the color component of a specimen having various color information and having improved focusing accuracy. CONSTITUTION: This focus detector is provided with a light source 1 for detecting a focus, an illumination optical system illuminating the specimen 2 with light from the light source, an image-formation optical system dividing the reflected light from the specimen into two luminous fluxes having the difference of an optical path and forming either luminous flux into an image at a 1st image-formation position (a) and the other luminous flux into an image at a 2nd image-formation position (b), a color photoelectric conversion element 10 arranged between two positions (a) and (b) and outputting color component signals R, G and B respectively corresponding to three color components red, green and blue respectively included in the two luminous fluxes, and an RGB adder circuit adding the color component signals R, G and B. Thus, contrast concerning the three color components is detected even in the case of the specimen having various color information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic focus detection device that can be used in optical instruments such as microscopes.

[0002]

2. Description of the Related Art As a conventional automatic focus detection device, for example, one shown in FIG. 10 is known. This automatic focus detection device is of a so-called image extraction system, and is a light source (a light source for focus detection that also serves as a light source for illumination for observation) 1 and irradiation for irradiating the object 2 with light from the light source 1. Optical system,
The reflected light from the test object 2 is divided into two light beams having an optical path difference, one of the two light beams is imaged at the first image forming position a, and the other of the two light beams is formed at the first image forming position a. Is arranged between the first image forming position a and the second image forming position b and the image forming optical system for forming an image at the second image forming position b which is shifted in the optical axis direction. And a monochrome photoelectric conversion element 3 for detecting a signal for detecting a focused state.

The light from the light source 1 is collected by the collector lens 4,
The inspection object 2 is irradiated with light through the relay lens 5, the half mirror 6 and the objective lens 7. The reflected light from the object 2 is
After passing through the objective lens 7, the half mirror 6 and the half prism 8, the half prism 9 has an optical path difference 2
The light is split into one light beam, and one of the two light beams is imaged at the first imaging position a and the other is imaged at the second imaging position b. Since the monochrome photoelectric conversion element 3 is irradiated with two light fluxes having an optical path difference, each of the photoelectric conversion elements 3 includes a high-frequency component (light information representing the contrast of each light flux imaged on the photoelectric conversion element). Signals 3A, 3B
(See FIG. 11) is output in time series (sequentially). The signal 3A corresponds to one luminous flux, and the signal 3B corresponds to the other luminous flux.

When the object to be inspected 2 is at the in-focus position, AB =
0 (A: distance between first imaging position a and light receiving surface of photoelectric conversion element 3, B: distance between second imaging position b and light receiving surface)
If the position of the photoelectric conversion element 3 is adjusted so that
At the focus position, the high frequency components of the signals 3A and 3B are equal. When the object 2 deviates from the in-focus position, a difference occurs in the high frequency components of the signals 3A and 3B according to the amount of deviation (for example, the signal waveform of the signal 3A shown in FIG. 11 is small (flat)).
And the signal waveform of the signal 3B becomes large or changes in the opposite way), so that the difference between them becomes 0, the object 2 and the objective in the optical axis direction of the imaging optical system The automatic focusing operation is performed by controlling the relative position with the lens 7.

[0005]

However, in the above-mentioned prior art, since two light beams obtained by branching the reflected light from the object to be inspected 2 are received by one monochrome photoelectric conversion element 3, they are shown in FIG. With the spectral sensitivity characteristic of such a monochrome photoelectric conversion element (the spectral sensitivity characteristic of a monochrome CCD is shown as an example in the same figure), for a test object having color information, the contrast relating to that color information can be detected efficiently. There is a problem that it is difficult.

That is, for an object having three color information (color components) of red, green, and blue, a monochrome image of the object is detected by the monochrome photoelectric conversion element 3 (see FIG. 7A). ) Is detected, the level of the output signal obtained for each of the two light beams incident on the photoelectric conversion element 3 naturally depends on the spectral sensitivity characteristic shown in FIG. Therefore, if the two light fluxes respectively include three color components of red, green, and blue having substantially equal light amounts as shown in FIG. Since the three color components have boundaries and strong contrast is generated at the boundaries, the high frequency components at the boundaries should be sufficiently detected as shown in FIG. 7C. However, since it is difficult for the monochrome photoelectric conversion element to detect the contrast relating to the color components, it is not possible to efficiently detect the high frequency component (of each color component) at the boundary portion. The image of the test object in FIG. 7A uses green, red, and blue arranged in order to facilitate understanding.

The present invention has been made in view of the above circumstances, and its problem is that even for an object having various color information, the high frequency component of the color component can be efficiently detected, and the focus is focused. An object is to provide an automatic focus detection device with improved accuracy.

[0008]

In order to solve the above-mentioned problems, the automatic focus detection device according to the invention of claim 1 comprises a light source,
An irradiation optical system that irradiates the object with the light from the light source, and the reflected light from the object is divided into two light beams having an optical path difference, and one of the two light beams is placed at a first imaging position. An image forming optical system for forming an image and forming an image of the other of the two light beams at a second image forming position deviated in the optical axis direction with respect to the first image forming position, the first image forming position and the first image forming position. In the automatic focus detection device, the photoelectric conversion means is disposed between the two image forming positions, and the photoelectric conversion means detects a signal for receiving the two light beams and detecting a focus state. An addition for outputting color component signals respectively corresponding to three color components of red, green and blue contained in two light fluxes, and adding each of the color component signals for each light flux Equipped with means.

In the automatic focus detection device according to the present invention, the photoelectric conversion means is a color photoelectric conversion element.

According to a third aspect of the present invention, there is provided an automatic focus detection device, which comprises an optical dividing means for dividing each light flux into three color components of red, green and blue before being received by the photoelectric conversion means. The photoelectric conversion means is composed of three monochrome photoelectric conversion elements that individually receive the three color components divided by the optical division means.

[0011]

In the automatic focus detection device according to claim 1, the photoelectric conversion means outputs color component signals respectively corresponding to three color components of red, green and blue contained in the two light fluxes,
Moreover, since the adding means adds each of the color component signals for each light flux, the contrasts of the three color components of red, green, and blue contained in the two light fluxes are also obtained for the object having various color information. Can be detected,
It is possible to efficiently detect the high frequency component at the boundary of each color component.

In the automatic focus detection device according to the second aspect, the color components corresponding to the three color components of red, green and blue respectively contained in the two light beams received by the color photoelectric conversion element are output and added. Since the means adds each of the color component signals for each light flux, the contrasts of the three color components of red, green and blue contained in the two light fluxes are detected even for the object having various color information. Therefore, the high frequency component at the boundary of each color component can be efficiently detected. Further, it is only necessary to use a color photoelectric conversion element as the photoelectric conversion means, and there is no need to change the optical system.

In the automatic focus detection device according to claim 3, 2
One light beam is divided into three color components of red, green and blue by the optical dividing means, and the divided light beams of the three color components are respectively received by the three monochrome photoelectric conversion elements. Therefore, each monochrome photoelectric conversion is performed. The element outputs a color component signal corresponding to one corresponding color component, and the adding means adds the three color component signals for each light flux. As a result, it is possible to detect the contrasts of the three color components of red, green, and blue contained in the two light fluxes even with respect to the test object having various color information, and the high-frequency component at the boundary of each color component is detected. Can be efficiently detected.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In the description of each embodiment, the same portions are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 shows an optical system of an automatic focus detection device according to the first embodiment of the present invention. In the description of the first embodiment, the same parts as those of the conventional automatic focus detection device shown in FIG. 10 are designated by the same reference numerals, and the duplicated description will be omitted.

As shown in FIG. 1, the automatic focus detection device according to the first embodiment is divided by the half prism 9 and contained in two light beams having an optical path difference, respectively, red (R) and green (G). , And the color component signals R, G, and B respectively corresponding to the three color components of blue (B) are time-divisionally output for each light flux (that is, the color component signals R, G, and G obtained from one light flux). B and the color component signals R, G, B obtained from the other light flux are sequentially output) Color photoelectric conversion element 10
And an RGB adder circuit 11 (see FIG. 2) that adds two sets of color component signals R, G, and B that are time-divisionally output from the color photoelectric conversion element 10 and sequentially outputs two added signals. It is different from the conventional automatic focus detection device shown in FIG. The color photoelectric conversion element 10
For example, a color CCD having the spectral sensitivity characteristic shown in FIG. 8 is used. The color photoelectric conversion element according to the present embodiment is configured by attaching a filter that allows only the red component, a filter that allows only the blue component, and a filter that allows only the green component to be attached to the light receiving surface of the monochrome photoelectric conversion element.

Further, the automatic focus detection apparatus according to the first embodiment is a signal processing circuit for processing the color component signals R, G, B output from the color photoelectric conversion element 10 (see FIG. 2).
It has.

This signal processing circuit, as shown in FIG.
The RGB addition circuit 11 and a DC offset removal circuit 1 for removing a DC component from the output signal of the RGB addition circuit 11.
2, an amplifier 13 that amplifies the output signal of the DC offset removal circuit 12, and a bandpass filter 14 that extracts a high frequency component from the output signal of the amplifier 13. Further, the signal processing circuit will be described later with reference to the absolute value circuit 15 that detects the absolute value of the output signal of the bandpass filter 14, the integrator 16 that integrates the output signal of the absolute value circuit 15, and the integrated value by the integrator 16. Timing control circuit 18
A sample and hold circuit 17 which holds the signal at a timing controlled by and outputs a signal representing the held integral value.
a, 17b, and a timing control circuit 18 for controlling the operation timing of the color photoelectric conversion element 10, the integrator 16, and the sample hold circuits 17a, 17b.

The integrator 16 outputs one of the two signals sequentially output from the absolute value circuit 15 (a signal corresponding to the one light beam) and the other signal (a signal corresponding to the other light beam).
And are integrated at the timing controlled by the timing control circuit 18, and two signals respectively representing the integrated values are sequentially output.

The sample hold circuits 17a and 17b are
At the timings controlled by the timing control circuit 18, the integrated values of the one signal and the other signal sequentially output from the integrator 16 are held and the signals representing the values are output. .

Further, the signal processing circuit compares the output signals of the sample and hold circuits 17a and 17b and represents the difference between them (a signal representing the amount of deviation of the object 2 from the in-focus position).
, A focusing motor 21 for controlling the relative position of the object 2 and the objective lens 7 in the optical axis direction, and an output signal from the differential amplifier 19 for controlling the focusing motor 21. And a motor control circuit 20.

In the present invention, it will be described that the RGB addition circuit 11 is provided and each color component signal R, G, B is added. The actual image of the object to be inspected is comparatively few in which green, red, and blue are arranged as shown in FIG. 7A, and the ratio of each color information occupying the light flux also varies. That is, a plurality of color component signals R, G, B are mixed in the light flux. For example, even if focus detection is performed using only the red color component signal among the color component signals R, G, and B, not only accurate focus detection cannot be performed using only the red color component signal R, but the light flux This is because focus detection cannot be performed if there is almost no red color information. Therefore, an RGB adder circuit is provided for accurate focus detection without being affected by the ratio of the color information contained in the light flux.

Next, the operation of the automatic focus detection device according to the first embodiment having the above construction will be described.

When two light fluxes having an optical path difference branched by the half prism 9 are applied to the color photoelectric conversion element 10, the color photoelectric conversion element 10 is divided into two by the spectral sensitivity characteristic of the color CCD shown in FIG. Color component signals R, G, and B respectively corresponding to three color components of red (R), green (G), and blue (B) contained in one of the light fluxes, and red (R included in the other of the two light fluxes ), Green (G), and blue (B) color component signals R, G, and B respectively corresponding to three color components are output in a time division manner. Two sets of color component signals R, G, B output from the color photoelectric conversion element 10 in a time division manner are RG.
The B addition circuits 11 are respectively input and added. As a result, the RGB addition circuit 11 sequentially outputs two addition signals obtained by adding the two sets of color component signals R, G, and B.

The output signal from the RGB addition circuit 11 is D
After the DC component is removed by the C offset removal circuit 12, it is amplified by the amplifier 13 and the high frequency component of this amplified signal is taken out by the bandpass filter 14.
Further, the absolute value of the high-frequency component signal output from the bandpass filter 14 is detected by the absolute value circuit 15. The integrator 16 controls the timing control circuit 18 to output one of the two signals (the signal corresponding to the one light beam) and the other signal (the signal corresponding to the other light beam) sequentially output from the absolute value circuit 15. The signals are integrated at controlled timings, and two signals respectively representing the integrated values are sequentially output. Sample and hold circuits 17a, 1
7b receives the one signal and the other signal sequentially output from the integrator 16 at timings controlled by the timing control circuit 18, respectively, holds the integrated value, and outputs a signal representing the value. To do.

The differential amplifier 19 is the sample hold circuit 1
A signal representing the difference between the two output signals from 7a and 17b (a signal representing the amount of deviation from the in-focus position of the object to be inspected 2) is output to the motor control circuit 20, and this control circuit 20 outputs the differential amplifier 1
A control signal corresponding to the output signal of 9 is output to the focusing motor 21. Then, the focusing motor 21 controls the relative position between the object 2 and the objective lens 7 in the optical axis direction of the imaging optical system according to the control signal from the motor control circuit 20.

That is, in the automatic focus detection apparatus according to the first embodiment having the above structure, the color photoelectric conversion element 10 is set so that AB = 0 when the object 2 is in the in-focus position.
If the position of is adjusted, two sets of signals R,
The high-frequency components of the two added signals obtained by adding G and B by the RGB addition circuit 11 are equal. When the DUT 2 deviates from the in-focus position, a difference occurs in the high frequency components of the two added signals depending on the amount of deviation, so that the difference becomes 0, that is, the output signal of the differential amplifier 19 The automatic focusing operation is performed by controlling the relative position between the object 2 and the objective lens 7 in the optical axis direction of the imaging optical system so as to be zero.

According to the first embodiment, the color photoelectric conversion element 10 has two sets of color component signals R corresponding to the three color components of red, green and blue contained in the two received light beams, respectively. G and B are output in a time division manner, and this 2
Since the RGB addition circuit 11 adds the sets of color component signals R, G, and B, the test object having various color information also relates to the three color components of red, green, and blue included in the two light fluxes, respectively. The contrast can be detected,
The high frequency component at the boundary of each color component can be efficiently detected as shown in FIG. Therefore, it is possible to efficiently detect the high-frequency components of the color components of the test object having various color information and improve the focusing accuracy.

Further, since it is only necessary to use the color photoelectric conversion element 10 as the photoelectric conversion means and there is no need to change the optical system at all, the manufacturing is easy and the structure is simple.

FIG. 3 shows an automatic focus detection device according to the second embodiment of the present invention.

In the automatic focus detection device of the second embodiment, the dichroic mirrors 41, 42 are provided before the reflected light from the object 2 to be detected is received by the monochrome photoelectric conversion elements 31, 32, 33 which are photoelectric conversion means. , 43 splits the light fluxes of the three color components of red, blue, and green, and splits the split light fluxes of the three color components into two light fluxes having optical path differences by the half prisms 51, 52, and 53, and outputs the monochrome photoelectric light. The conversion elements 31, 32, 33 are configured to receive light independently.

The dichroic mirror 41 reflects only light (R) having a certain wavelength or more (reflected light having a longer wavelength, that is, red component) (R) from the reflected light from the test object 2, and the dichroic mirror 42 uses the dichroic mirror 41. Light (B) having a certain wavelength or less (light having a shorter wavelength, that is, blue component) is reflected from the transmitted light, and the dichroic mirror 43 further transmits the light having the green component (G (G)). ) Is reflected.

In the second embodiment having such a structure,
The red component light (R) reflected by the dichroic mirror 41 is branched by the half prism 51 into two luminous fluxes having an optical path difference, and the two branched luminous fluxes of the red component are received by the monochrome photoelectric conversion element 31. by this,
The photoelectric conversion element 31 has two color component signals R corresponding to the red (R) color components respectively included in the two light fluxes.
Are output in a time division manner from the light receiving portion of each light flux.

The blue component light flux (B) reflected by the dichroic mirror 42 is branched by the half prism 52 into two light fluxes having an optical path difference, and the two branched blue light fluxes are received by the monochrome photoelectric conversion element 32. It As a result, the photoelectric conversion element 32 outputs two color component signals B corresponding to the blue (B) color components respectively included in the two light fluxes in a time division manner from the light receiving portions of the respective light fluxes.

Similarly, the light flux (G) of the green component reflected by the dichroic mirror 43 is branched by the half prism 53 into two light fluxes of the green component having an optical path difference, and the split light fluxes of the two green components are monochrome photoelectric. Conversion element 3
Light is received at 3. As a result, the photoelectric conversion element 33 is
The two color component signals G respectively corresponding to the green (G) color components respectively included in the two light fluxes are time-divisionally output from the light receiving portions of the respective light fluxes.

Then, the monochrome photoelectric conversion elements 31 to 33
The two color component signals respectively output in a time-division manner from are input to the RGB addition circuit 11 and added.
As a result, the RGB addition circuit 11 sequentially outputs two addition signals obtained by adding the two sets of color component signals R, G, and B, as in the first embodiment. The subsequent operation is the same as in the first embodiment.

FIG. 4 shows an automatic focus detection device according to the third embodiment of the present invention.

In the automatic focus detection device of the third embodiment, the reflected light from the object 2 to be detected is converted into monochrome photoelectric conversion elements 31, 3 and 3.
Before the light is received by 2 and 33 respectively, the half mirror 6
1, 62, 63 divide the light beam into three light beams, and a band-pass filter 71 that passes only the red component from the light beam reflected by the half mirror 61 makes a light beam containing a red component, and the light beam reflected by the half mirror 62 is blue. A light flux containing a blue component is produced by a bandpass filter 72 that passes only the component, and a light flux including the green component is produced by a bandpass filter 73 that passes only the green component from the light flux reflected by the half mirror 63. is there. Then, the light flux including the red component produced by the bandpass filter 71 proceeds to the half prism 51,
The light flux containing the blue component produced by the bandpass filter 72 travels to the half prism 52, and the light flux containing the green component produced by the bandpass filter 73 travels to the half prism 53.

FIG. 5 shows an automatic focus detection device according to the fourth embodiment of the present invention.

In the automatic focus detection device of the fourth embodiment, before the reflected light from the object to be inspected 2 is received by the monochrome photoelectric conversion element 34, the rotary bandpass filter 80 is used to detect red, green and blue. It is configured to be divided into light fluxes of one color component. That is, in this automatic focus detection device, in the first embodiment shown in FIG. 1, the rotary bandpass filter 80 is arranged in the optical path between the half prism 8 and the half prism 9, and the color photoelectric conversion element is used. A monochrome photoelectric conversion element 34 is used instead of 10.

The rotary bandpass filter 80, as shown in FIG. 6, is a bandpass filter 8 that passes only the red component.
Bandpass filter 80G that passes only 0R and the green component
And a bandpass filter 80B that allows only the blue component to pass therethrough. By rotating the rotary bandpass filter 80, the bandpass filter 80
A red component luminous flux is produced by R, a green component luminous flux is produced by the band pass filter 80G, and finally a blue component luminous flux is produced by the band pass filter 80B.
The light flux (R) of the three color components created in this way,
(G) and (B) are sequentially divided into two light beams by the half prism 9, and the two divided light beams of each color enter one monochrome photoelectric conversion element 34. The subsequent operation is the same as in the first embodiment.

In the fourth embodiment, the luminous fluxes (R), (G) and (B) of the three color components are formed in this order and enter the photoelectric conversion element 34.
It is necessary to store each signal output in the order of G and B.

According to the fourth embodiment described above, the second embodiment shown in FIG.
The configuration of the optical system is simpler than that of the embodiment and the third embodiment shown in FIG.

In each of the above-mentioned embodiments, two sets of color component signals R, G, output from the color photoelectric conversion element 10 are used.
When B is added by the RGB addition circuit 11, the S / N levels of the color component signals R, G, and B are different from each other. Therefore, three colors are used so that the S / N of the added signal becomes the best. Weighting according to the S / N level at the time of adding the component signals R, G, and B, and performing focus detection by the two signals obtained as a result, the high-frequency component of each color component is efficiently and the S / N is the highest. It can be detected in good condition.

[0045]

As described above, according to the automatic focus detection device of the first aspect of the present invention, the photoelectric conversion means has two elements.
Since the color component signals respectively corresponding to the three color components of red, green, and blue included in each light flux are output, and the adding means adds each of the color component signals for each light flux,
With respect to the test object having various color information, it is possible to detect the contrasts of the three color components of red, green, and blue contained in the two light fluxes, and efficiently detect the high-frequency components at the boundary of each color component. Can be detected.
Therefore, it is possible to efficiently detect the high-frequency components of the color components of the test object having various color information and improve the focusing accuracy.

According to the second aspect of the automatic focus detection device of the present invention, the color components respectively corresponding to the three color components of red, green and blue contained in the two light beams received by the color photoelectric conversion element are detected. Since the addition means adds the respective color component signals for each light flux, the three color components of red, green and blue included in the two light fluxes are also included in the test object having various color information. Contrast can be detected, and high frequency components at the boundary of each color component can be detected efficiently. Further, it is sufficient to use a color photoelectric conversion element as the photoelectric conversion means,
There is no need to change the optical system. Therefore, with a simple configuration, even for an object having various color information,
The high frequency component of the color component can be efficiently detected.

According to the automatic focus detection device of the third aspect of the invention, the two light beams are divided into three color components of red, green and blue by the optical dividing means, and the three divided light components are obtained. Since the light fluxes of the color components are respectively received by the three monochrome photoelectric conversion elements, each monochrome photoelectric conversion element outputs a signal divided into three color components, and the divided signals are added by the adding means. As a result, it is possible to detect the contrasts of the three color components of red, green, and blue contained in the two light fluxes even with respect to the test object having various color information, and the high-frequency component at the boundary of each color component is detected. Can be efficiently detected. Therefore, it is possible to efficiently detect the high frequency components of the color components of the test object having various color information.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an optical system of an automatic focus detection device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a signal processing circuit of the automatic focus detection device shown in FIG.

FIG. 3 is a schematic configuration diagram showing an optical system of an automatic focus detection device according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing an optical system of an automatic focus detection device according to a third embodiment of the present invention.

FIG. 5 is a schematic configuration diagram showing an optical system of an automatic focus detection device according to a fourth embodiment of the present invention.

6 is a plan view showing main components of the automatic focus detection device shown in FIG.

FIG. 7 is an explanatory diagram showing three color information and a signal level indicating a light amount of each color information.

FIG. 8 is a diagram showing a spectral sensitivity characteristic of a color photoelectric conversion element.

FIG. 9 is a diagram showing a spectral sensitivity characteristic of a monochrome CCD.

FIG. 10 is a schematic configuration diagram showing a conventional automatic focus detection device.

11 is a diagram showing signals obtained from a monochrome photoelectric conversion element in the automatic focus detection device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source 2 Test object 10 Color photoelectric conversion element 11a, 11b RGB addition circuit (addition means) 31-34 Monochrome photoelectric conversion element 41-43 Dichroic mirror (optical division means) 71-73 Band pass filter (optical division means) ) 80 rotary bandpass filter (optical dividing means)

Claims (3)

[Claims] 1. A light source, an irradiation optical system for irradiating a test object with light from the light source, and reflected light from the test object is divided into two light beams having an optical path difference. An image forming optical system that forms one image at a first image forming position and forms the other of the two light fluxes at a second image forming position that is displaced in the optical axis direction with respect to the first image forming position, An automatic focus detection device, which is arranged between a first image formation position and the second image formation position, and includes a photoelectric conversion unit that receives the two light beams and detects a signal for detecting a focus state. In the above, the photoelectric conversion means is configured to output color component signals respectively corresponding to three color components of red, green and blue contained in the two light fluxes, and each of the color component signals is output. It is characterized in that it is provided with an adding means for adding each of the light fluxes. Automatic and focus detection device. 2. The automatic focus detection device according to claim 1, wherein the photoelectric conversion means is a color photoelectric conversion element. 3. An optical dividing means for dividing each of the light fluxes into three color components of red, green and blue before being received by the photoelectric converting means, wherein the photoelectric converting means is the optical dividing means. 2. The automatic focus detection device according to claim 1, comprising three monochrome photoelectric conversion elements that independently receive the divided three color components.