JP2001245099A - Color image pickup device and picture reader using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image pickup device which prevents degradation in the picture quality due to chromatic aberrations. SOLUTION: A red line 11, a green line 12, and a blue line 13 in an image pickup device 1 are arranged stepwise. Thus the distance from a light source to the light reception face of the red line 11, that to the light reception face of the green line 12, and that to the light reception face of the blue line 13 are different from one another. An unequality LB<LG<LR holds where LR is the distance from the light source to the light reception face of the red line 11 and LG is that to the light reception face of the green line 12 and LB is that to the light reception face of the blue line 13. Therefore the lines of imaging devices corresponding to respective colors are arranged in the image forming positions of respective colors independently of the chromatic aberrations of the lens. Consequently, since the image forming position of each color is on the light reception face of the image pickup device 1 though the image forming position of condensed light is different by the chromatic aberrations of the lens, the resolution of the image pickup device 1 is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color image pickup device that converts light from a light source into an electric signal and outputs the electric signal, and an image reading device using the same.

[0002]

2. Description of the Related Art For example, an image reading device such as a scanner is provided with an image pickup device such as an optical sensor. The imaging device includes a plurality of imaging elements, each of which receives light emitted from a light source and reflected on or transmitted through the original, and outputs an electric signal according to the amount of received light. That is, the received light is converted into an electric signal and output.

The above-described image pickup apparatus outputs an electric signal in accordance with the amount of light received, and reads the intensity of light from a document, and outputs the intensity of the light as the density of an image. Therefore, the read image is output as monochrome image data in principle, and if no other means is provided, a color image cannot be read.

Therefore, when reading a color image, a color filter of, for example, any one of red, green and blue is arranged on the light receiving surface side of the image sensor. This color filter transmits only light of any of red, green and blue colors. A color image can be obtained by synthesizing the image data output from the image sensor that has received the light of any one of these colors.

[0005]

For example, in the case of an image reading apparatus capable of reading a color image, in general, light from a document is condensed by a condensing means such as a condensing lens and is incident on an image pickup apparatus. Therefore, the document 100, the lens 200, and the imaging device 300 are arranged in a positional relationship as shown in FIG. That is, the distance from the center of the lens 200 to the imaging device 300 is constant regardless of the color of light incident on the imaging device 300.

However, the wavelength of light passing through the lens 200 differs depending on the color, and chromatic aberration occurs due to the characteristics of the lens 200. That is, as shown in FIG. 10, the light passing through the lens 200 has different colors, that is, red light, green light, or blue light, and the focus position and the imaging positions FR, FG, and FB are different.

For this reason, as shown in FIG.
When the distance from 0 to the imaging device 300 is constant, for example, if the imaging device 300 is arranged at the green light imaging position FG, the red light imaging position FR and the blue light imaging position FB are set to the imaging device. There is a problem that it deviates from the light receiving surface of the light receiving surface 300.

In particular, in recent years, since the resolution of an image pickup apparatus has been improved, there is a possibility that the image quality of an image to be read may be deteriorated even if the image forming position is slightly shifted. As a means for avoiding the influence of chromatic aberration, a method of moving the lens or the imaging device to adjust the imaging position to the imaging device by the color of light, or a method of employing an achromatic lens or an aspherical lens with reduced occurrence of chromatic aberration, and the like. is there.

However, in the method of adjusting the image forming position to the image pickup device for each color, it is necessary to move the lens or the image pickup device precisely, so that the structure of the image reading device becomes complicated and the manufacturing cost increases. There is. Therefore, it is only used in some high-end image reading devices. Further, even when an achromatic lens or an aspherical lens is employed, since such lenses are expensive, there is a problem that the manufacturing cost increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an image pickup apparatus capable of preventing a decrease in image quality due to chromatic aberration. Another object of the present invention is to provide an image reading apparatus capable of improving resolution without increasing manufacturing cost.

[0011]

According to a first aspect of the present invention, there is provided a color image pickup apparatus comprising a plurality of image pickup devices, wherein a light receiving surface of the image pickup device has a mutual position different in a light receiving direction depending on a color of light received. It is arranged with a step. Therefore, when a light condensing unit such as a lens is disposed between the light source and the light receiving surface, it is possible to prevent the influence of chromatic aberration caused by the light converging unit. Therefore, even if the colors are different, the image forming position can be set to the light receiving surface of the image sensor,
It is possible to prevent a decrease in image quality due to chromatic aberration.

According to the color image pickup apparatus of the present invention, a plurality of image pickup devices are arranged on a straight line in the first direction, and the image pickup device rows are arranged in a second direction perpendicular to the first direction.
It is arranged in multiple directions. Therefore, for example, it can be used as a line sensor of an image reading apparatus that reads a document line by line.

According to the color image pickup apparatus of the present invention, the image pickup element row is a red element row for receiving red light;
It is composed of a green element row for receiving green light and a blue element row for receiving blue light. That is, an image sensor row is arranged for each color to receive light.

According to the color image pickup apparatus of the present invention, the distances from the light sources arranged at the predetermined positions to the respective light receiving surfaces of the red, green and blue image sensor rows are different. I have. The red image sensor array has the largest distance, and the blue image sensor array has the smallest distance. Due to the effect of chromatic aberration, red light having a longer wavelength forms an image at a position farther from the light source, and blue light having a shorter wavelength forms an image at a position closer to the light source. Therefore, the light receiving surface of each image sensor array can be arranged at an image forming position of each color. Therefore, the influence of chromatic aberration can be prevented, and the deterioration of image quality due to chromatic aberration can be prevented.

According to the color imaging device of the present invention, the red, green and blue element rows are arranged in a stepped manner. Therefore, the distance from the light source to the light receiving surface of each image sensor array can be changed. Also, when molding the substrate on which the image sensor is mounted,
For example, each element row can be easily formed in a step shape by etching or the like. Therefore, it is possible to form the position of the light receiving surface of the image sensor array that differs depending on the color of the received light at low cost.

According to the color imaging apparatus of the present invention, the light receiving surface of each element row is arranged so as to be concavely curved in the first direction. That is, the distance from the light source to the light receiving surface is larger in the central part than in both ends in the first direction of each element row. Therefore, for example, when the light collecting means is arranged between the light source and the light receiving surface, it is possible to prevent the influence of distortion caused by the spherical surface of the light collecting means. Light from the light source passing through the condenser lens is perpendicularly incident on the image sensor.
Therefore, it is possible to prevent the image quality from deteriorating due to the distortion and the occurrence of color unevenness due to the difference in the incident angle.

According to the color image pickup apparatus of the present invention, the first light condensing means is arranged on the light receiving surface side of the image pickup device. The first light condensing means has a different focal length depending on the color of light to be condensed. Therefore, it is possible to prevent the influence of chromatic aberration due to another light condensing unit disposed between the light source and the first light condensing unit. Therefore, even if the colors are different, the image forming position can be set on the light receiving surface of the image pickup device, and the deterioration of the image quality due to chromatic aberration can be prevented.

According to the color image pickup apparatus of the present invention, the first light condensing means is colored. By coloring the first light collecting means in the same color as the color filter, the color filter can be eliminated. Therefore, it is not necessary to dispose the color filter and the first light condensing unit on the light receiving surface side of the imaging device, and the manufacturing process can be omitted.

According to an eleventh aspect of the present invention, there is provided the color image pickup device according to any one of the first to tenth aspects. Therefore, even when the second condensing unit is arranged in the optical path from the light source to the imaging device, it is possible to prevent the influence of chromatic aberration caused by the second condensing unit. Further, there is no need to move the color image pickup device or use an achromatic lens or an aspherical lens as the second focusing means. Therefore, the resolution can be improved without increasing the manufacturing cost.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention; (First Embodiment) FIG. 1 shows a color imaging apparatus (hereinafter simply referred to as "imaging apparatus") according to a first embodiment of the present invention.

As shown in FIG. 1, the image pickup apparatus 1 of the present embodiment
Has an image sensor array in which a plurality of image sensors are linearly arranged in the main scanning direction as the first direction. The imaging element array includes a red line 11 as a red element array into which red (R) light of the incident light is incident, a green line 12 as a green element array into which green (G) light is incident, And a blue line 13 as a blue element array on which blue (B) light is incident. As shown in FIG. 2, on the red line 11, the green line 12, and the blue line 13, a plurality of image sensors 110, 120, and 130 are linearly arranged in the main scanning direction. Image sensors 110, 120, 13
Reference numeral 0 denotes a photoelectric conversion element, which outputs an electric signal proportional to the amount of incident light. Thereby, the imaging devices 110 and 12
Light incident on 0 and 130 is converted into an electric signal. Red line 11, green line 12, and blue line 13
, Transfer gates 111, 121, and 131 and shift registers 112, 122, and 132 are arranged, respectively.

The electric charges accumulated in the image pickup devices 110, 120, and 130 of the red line 11, the green line 12, and the blue line 13 are transferred in synchronization with a drive signal generated at a predetermined interval. Are transferred to the shift registers 112, 122, and 132. When the charge transfer is completed, the red line 11 and the green line 1
The next reading process is performed on 2 and the blue line 13 to accumulate charges. Shift registers 112, 12
The electric charges transferred to the image sensors 2 and 132 are sequentially output from the output units 113, 123 and 133 for each image sensor.

As shown in FIG. 3, each of the image pickup devices 110, 1 for red line 11, green line 12, and blue line 13
Reference numerals 20 and 130 denote CCD (Charge Coupled) on the substrate 20.
Device) 114, 124, 134, photodiodes 115, 125, 135, color filters 116, 12
6, 136 and protective layers 117, 127, 137 are sequentially laminated. Note that the transfer gate and the shift register are not shown in FIG.

Photodiodes 115, 125, 135
Converts received light into electric charge. CCD 114, 12
4, 135 are photodiodes 115, 125, 13
The converted charge is accumulated in 5 and the accumulated electrons are emitted at a predetermined time. Thereby, the imaging devices 110, 120,
The light incident on 130 is output as an electric signal corresponding to the amount of light. Photodiodes 115, 125, 135
Is a light receiving surface on which light from the light source is incident.

Color filters 116, 126, 136
Are arranged on the light receiving surface side of the imaging elements 110, 120, and 130. The color filters 116, 126, and 136 are any of red, green, and blue colors, and transmit only light of the same color as their own color among light emitted from a light source (not shown). That is, the red filter transmits red light, the green filter transmits green light, and the blue filter transmits only blue light. Therefore, the light emitted from the light source is applied to the color filters 116, 126, 136.
, The red light enters the red line 11, the green light enters the green line 12, and the blue light enters the blue line 13.

The protective layers 117, 127, 137 are provided on the light source side of the color filters 116, 126, 136.
It is provided to protect the surfaces of the imaging elements 110, 120, and 130. The protective layers 117, 127, 137
Does not hinder the incidence of light from the light source.

The substrate 20 is formed such that the cross section perpendicular to the main scanning direction has a stepped shape. The step-shaped steps of the substrate 20 are easily formed by performing, for example, etching or the like when the substrate 20 is formed.

A red line 11, a green line 12, and a blue line 13 are formed on the substrate 20 formed in a stepped shape. Therefore, the red line 11,
The green line 12 and the blue line 13 are arranged stepwise. The distance from the bottom 20 a of the substrate 20 to the light receiving surface is the largest for the blue line 13, and decreases in the order of the green line 12 and the red line 11. Therefore, as shown in FIG. 4, the distance from the light source 30 to the light receiving surface of the red line 11 is LR, the distance from the light source 30 to the light receiving surface of the green line 12 is LG, and the distance from the light source 30 to the light receiving surface of the blue line 13 is Assuming that the distance is LB, LB <LG <LR.

By configuring the imaging device 1 as described above, a light source 30 is provided on the light source side of the imaging device 1 as shown in FIG.
When the lens 40 for condensing the light from the light source is disposed, the red line 11 and the green line 12 of the imaging device 1 are located at the image forming positions of the red, green, and blue lights which are different due to the chromatic aberration caused by the lens 40. , The light receiving surface of the blue line 13 is arranged. The distance from the bottom 20a of the substrate 20 to the red line 11, the green line 12, and the blue line 13 depends on the chromatic aberration characteristics of the lens 40 to be applied or the light source 3
It is determined by the optical path length from 0 to the imaging device 1.

As described above, according to the imaging apparatus 1 of this embodiment, the distances from the light source 30 to the light receiving surface of the red line 11, the light receiving surface of the green line 12, and the light receiving surface of the blue line 13 are different. Have been. Therefore, regardless of the chromatic aberration of the lens 40, the line of the image sensor corresponding to each color can be arranged at the image forming position of each color.

Therefore, even when the image-forming positions of the condensed light due to the chromatic aberration of the lens 40 are different, the image-forming positions of the respective colors are on the light receiving surface of the image-capturing device 1, so that the resolution of the image-capturing device 1 can be improved. it can.

Next, an image reading apparatus equipped with the above-described imaging device 1 will be described. As shown in FIG. 6, the image reading device 5 includes a box-shaped housing 50. A document table 51 made of a transparent plate such as glass is provided above the housing 50. A carriage 53 is provided inside the housing 50 so as to be reciprocally movable in a sub-scanning direction parallel to the original 6 placed on the original table 51 by the driving device 52.

On the carriage 53, the light source 31 and the above-mentioned image pickup device 1 are mounted. Irradiation light from the light source 31 is reflected on the surface of the document 6 and is condensed on the image pickup apparatus 1 by a condensing lens 41 as second condensing means. The light source 31 is provided perpendicular to the moving direction of the carriage 53, that is, in the main scanning direction, and a fluorescent lamp or the like is used. A document guide 54 that positions the reading position of the document 6 and regulates the movement of the document 6 when reading the document is provided around the document table 51.

The image reading device 5 is provided with a control circuit 55 for controlling each part of the image reading device 5. The control circuit unit 55 includes a data creation unit 55 that creates image data from the electric signal output from the imaging device 1.
1. CPU 55 for controlling each part of the image reading device 5
2. A ROM 553 or the like in which a computer program for controlling each unit by the CPU 552 is stored.

The image reading device 5 is provided with an interface 56 for outputting the created digital data to an external personal computer (hereinafter, the personal computer is referred to as a "personal computer") 7.
The cable 56 for electrically connecting the image reading device 5 and the personal computer 7 is connected to the interface 56.

Next, the operation of the image reading device 5 will be described. The user places the document 6 on the document table 51 and reads the document 6 to the image reading device 5 via an application program for controlling the image reading device 5 such as TWAIN activated on the personal computer 7. Instruct to start.

When the user instructs to start reading the document 6, the CPU 552 turns on the light source 31. Then, the CPU 552 controls the driving device 52 to move the carriage 53 at a constant speed in the sub-scanning direction.
In the red line 11, the green line 12, and the blue line 13 of the image pickup apparatus 1, light from the original 6 is converted into electric charges and stored. The accumulated charges are transferred to a shift register by a drive signal generated every predetermined time, and image data for one line is sequentially output to a data creation unit 551 of the control circuit unit 55.

The data creation section 551 amplifies the analog electric signal output from the image pickup apparatus 1 and converts it into digital data by the A / D conversion section, and the shading correction section, the gamma correction section and other correction sections. Make various corrections. The shading correction unit corrects a variation in sensitivity of each element of the imaging apparatus and a variation in light amount of the light source in the main scanning direction by using data obtained by reading the white reference before starting reading. The gamma correction unit performs gamma correction using a predetermined gamma function, and converts the light amount signal output from the shading correction unit into an image signal. In other correction units,
Various conversions such as color correction, edge enhancement, and area enlargement / reduction are performed.

The digital data corrected by the data generator 551 is output to the personal computer 7 via the interface 56 and the cable 8. The original 6 is read by repeating the above processing while moving the carriage 53 in the sub-scanning direction at a constant speed.

According to the image reading device 5 according to the first embodiment, even when the condenser lens 41 is disposed between the light source 31 and the image pickup device 1, the light reception of the image pickup device 1 from the light source 31 is performed as described above. Since the distance to the surface differs depending on the color of the received light, the imaging device 1 is not affected by the chromatic aberration of the condenser lens 41. Therefore, the resolution of the imaging device 1 is improved, and the document reading performance of the image reading device 5 can be improved. Further, there is no need to drive the imaging device 1 or the condenser lens 41 or use an expensive lens. Therefore, the resolution can be improved without increasing the manufacturing cost of the image reading device 5.

As described above, the first embodiment has been described with respect to an example in which a reflection original such as paper is used as the original. However, a transparent original such as a positive film or a negative film can be read by disposing a light source above the original. it can.

(Second Embodiment) FIG. 7 shows an imaging apparatus according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the second embodiment, as shown in FIG.
Lenses 118, 128, and 138 as first light condensing means are disposed closer to the light source than 15, 125, and 135. The lenses 118, 128, and 138 are arranged for each image sensor. These lenses 118, 128,
138 is colored in any of red, green or blue depending on the line to be arranged, and the color filter and the lens are integrated.

In the second embodiment, lenses 118, 128 and 138 are arranged instead of the protective layer. This lens 1
18, 128 and 138 have different focal lengths depending on the line to be arranged. That is, the lens 1 arranged on the red line 11, the green line 12, and the blue line 13
18, 128 and 138 have different focal lengths.

By arranging the lenses 118, 128, and 138 having different focal lengths on the light source side of the imaging device 2, the image forming position can be changed depending on the color of the light to be collected. Therefore, the red line 11, the green line 12, and the blue line 13 do not need to change the distance from the bottom 20a of the substrate 20 to the light receiving surface.

For example, when a condenser lens 41 for condensing light from the light source 31 is disposed closer to the light source 31 than the imaging device 2 as shown in FIG. 6, chromatic aberration is caused by the condenser lens 41. Due to the chromatic aberration caused by the condenser lens 41, the image forming positions of the red light, the green light and the blue light are respectively different. However, different imaging positions due to chromatic aberration are set to the lenses 118, 128,
138 corrects the photodiode 11
5, 125 and 135 on the side opposite to the substrate can be used as the imaging position.

Therefore, even when the condenser lens 41 is disposed on the light source side of the imaging device 2, the influence of chromatic aberration due to the condenser lens 41 can be reduced, and the resolution of the imaging device 2 can be increased.

As described above, in the second embodiment, the lenses 118, 12
Although an example in which 8, 138 are colored red, green, or blue has been described, the lens and the color filter may be formed separately. Further, a protective layer may be provided on the surfaces of the lenses 118, 128, and 138 on the light source side.

(Third Embodiment) FIG. 8 shows an imaging apparatus according to a third embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. As shown in FIG. 8, the light receiving surface of the imaging device 3 according to the third embodiment has a concave cross section in the main scanning direction. The light receiving surface is curved such that both end portions 3a and 3b of the imaging device are closest to the light source, and the central portion of the imaging device 3 is farthest from the light source. This is to prevent the influence of distortion in the main scanning direction due to the condenser lens 41 that occurs when the condenser lens 41 is disposed closer to the light source than the imaging device 3.

Since the surface of the condenser lens 41 is spherical,
Strictly speaking, the imaging position P is not on a straight line but on a curved curve as shown in FIG. That is, for example, as shown in FIG. 9, when the center of the imaging device 101 is adjusted to the image forming position, the both ends are slightly shifted from the image forming position. Therefore, if the resolution of the central portion of the imaging apparatus 101 is improved, the quality of the read image is reduced at the end in the main scanning direction due to the influence of the distortion. Further, when the light receiving surfaces of the imaging device 101 are arranged on a straight line, the angles of the incident light are different between the central portion and both end portions of the imaging device. Therefore, the amount of incident light is not constant, and color irregularities may occur in the read document.

These effects also occur in the sub-scanning direction, but are negligible because the length of the imaging device in the sub-scanning direction is extremely small as compared with the main scanning direction. As shown in FIG. 8, when the light receiving surface of the imaging device 3 is curved, the influence of distortion can be prevented. Further, since the light that has passed through the condenser lens 41 shown in FIG. 6 is perpendicularly incident on the light receiving surface, the amount of light incident on the imaging device 3 can be kept constant, and color unevenness can be prevented. be able to.

In the third embodiment, the influence of distortion is prevented by curving the light receiving surface of the image pickup device 3. However, for example, when a lens is arranged on the light receiving surface side of the image pickup device as in the second embodiment, The influence of distortion can be prevented by changing the focal length of the lens from the center to the both ends of the imaging device.

As described above, in the embodiments of the present invention, the example in which the photodiode is applied to the imaging device has been described. However, the invention is not limited to the photodiode, and the phototransistor may be applied to the imaging device.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an imaging device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing an arrangement of an image pickup device of the image pickup apparatus according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating the imaging device according to the first embodiment of the present invention, and is a diagram illustrating a state of being cut along a plane perpendicular to a main scanning direction.

FIG. 4 is a schematic diagram illustrating a relationship between a distance between an imaging device and a light source according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram illustrating a positional relationship among an imaging device, a lens, and a light source according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram showing an image reading device provided with the imaging device according to the first embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating an imaging device according to a second embodiment of the present invention, and is a diagram illustrating a state of being cut along a plane perpendicular to a main scanning direction.

FIG. 8 is a schematic perspective view showing an imaging device according to a third embodiment of the present invention.

FIG. 9 is a diagram for explaining distortion caused by a lens.

FIG. 10 is a diagram for explaining the effect of chromatic aberration on a conventional imaging device.

[Explanation of symbols]

1, 2, 3 imaging device 5 image reading device 11 red line (red element line) 12 green line (green element line) 13 blue line (blue element line) 30, 31 light source 41 condensing lens (second condensing means) 110, 120, 130 Image sensor 118, 128, 138 Lens (first condensing unit, color filter)

Claims (11)

[Claims] 1. An image pickup device for receiving light, converting the received light into an electric signal and outputting the electric signal, wherein the light receiving surface of the image pickup device has different positions in the light receiving direction depending on the color of the light to be received. A color imaging device characterized by being arranged with a step as described above. 2. An image pickup device comprising: a plurality of image pickup elements arranged in a straight line in a first direction; wherein the image pickup element rows are positioned in a light receiving direction in a second direction perpendicular to the first direction. 2. The color image pickup apparatus according to claim 1, wherein steps are provided so as to be different from each other. 3. The image pickup element row includes a red element row that receives red light, a green element row that receives green light, and a blue element row that receives blue light. The color imaging device according to claim 2. 4. The light-receiving surface of the red element row, the light-receiving surface of the green element row, and the light-receiving surface of the blue element row have a distance from a light source disposed at a predetermined position to the red light element. If the distance from the light source to the light receiving surface of the green element row is LG, and the distance from the light source to the light receiving surface of the blue element row is LB, LB <LG <LR 4. The arrangement of claim 3, wherein
The color imaging device according to claim 1. 5. The color imaging device according to claim 4, wherein the red, green, and blue element rows are arranged in a stepped manner. 6. The light receiving surface of the red element line, the light receiving surface of the green element line, and the light receiving surface of the blue element line,
The color imaging device according to claim 4, wherein the color imaging device is arranged so as to be concavely curved in the direction. 7. A color filter that transmits only light of a predetermined color, and an image sensor that has the color filter disposed on a light receiving surface side, receives light transmitted through the color filter, converts the light into an electric signal, and outputs the electric signal. A first light condensing unit disposed on a light receiving surface side of the image sensor, condensing light on the image sensor, and having a different focal length depending on a color of the light to be condensed. . 8. The color imaging device according to claim 7, wherein said first light condensing means is colored. 9. The image pickup device according to claim 1, further comprising an image sensor array arranged in a straight line in a first direction, wherein a plurality of the image sensor arrays are arranged in a second direction perpendicular to the first direction. 9. The color imaging device according to claim 7, wherein: 10. A light-receiving surface of the image sensor array, wherein
The color imaging device according to claim 9, wherein the color imaging device is arranged so as to be concavely curved in the direction. 11. A light source for irradiating an original, and a light source for irradiating the original.
An image reading device, comprising: the color imaging device according to any one of Claims 0 to 0; and a second light collection unit that collects light from the light source onto the color imaging device.