JP2004226455A - Camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera equipped with a flash light emitting device in which a xenon tube and a main capacitor can be downsized by improving the availability of flash light. <P>SOLUTION: A protector 5 and a reflector 7 are coated with fluorescent material 130. Fluorescence in a visible light region is generated by irradiating the material 130 which is coated on the reflector 7 as a substance urging to emit a fluorescence within the visible light region by irradiating the material 130 with the flash light outside the visible light region, out of the flash light radiated from the xenon tube 6. Then, light including the fluorescence is emitted as the flash light from the protector 5. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a camera that shoots a subject by emitting a flash.
[0002]
[Prior art]
Many cameras are provided with a flash light emitting device that emits flash light in order to give a sufficient amount of light to the photosensitive surface of the film or the image sensor when the field luminance is low.
[0003]
FIG. 1 is a view showing an appearance of a camera 1 provided with the flash light emitting device.
[0004]
As shown in FIG. 1, a release button 2 is provided on the upper surface of the camera body 1a, and a lens barrel 3 is provided near the center of the front surface of the camera body. A light emission window 4 is provided obliquely above the lens barrel 3, and a protector 5 is fitted into the light emission window 4. Inside the protector 5 is disposed an arc tube 6 that emits flash light toward the subject through the protector 5. FIG. 2 is a diagram showing the configuration of the light emitting section around the arc tube 6. In FIG. 2, a xenon tube is shown as the arc tube 6.
[0005]
As shown in FIG. 2, the xenon tube 6 has a cylindrical shape, and a reflector 7 curved along the longitudinal direction of the cylindrical xenon tube 6 is provided. The reflector 7 reflects the flash light toward the subject.
[0006]
The flash light emitted from the xenon tube 6 includes from ultraviolet light to infrared light, and is necessary for red light (hereinafter referred to as R light), green light (hereinafter referred to as G light), blue light (hereinafter referred to as “light”). A lot of light other than B light) is included. Actually, light having a wavelength in the visible light range, particularly R light, G light, and B light, may be used. If these three primary colors are additively mixed and emitted, light that appears to be white light to the naked eye is directed toward the subject. The signal processing for generating a color image based on the flash can be performed. In a digital camera or the like, various colors from black to white are obtained by mixing R light, G light, and B light constituting the three primary colors of light, and a color image is generated.
[0007]
This suggests that the flash light emitted from the xenon tube is sufficient in the visible light range, particularly only the R light, G light, and B light. If the flash light emitted from the xenon tube is R light, G light, This suggests that the use efficiency of the flash increases if it is mixed with the three colors of B light.
[0008]
By the way, in recent years, with the advent of light emitting diodes that emit B light, a movement to manufacture white light emitting diodes has become active. Other light emitting diodes include an R photodiode, a G photodiode, and the like. If a B photodiode is used, a white flash can be obtained by mixing the light emitting diodes.
[0009]
Some light emitting diodes that obtain such white light emit white light using yellow light (hereinafter referred to as Y light) that is a complementary color of R light and G light (see, for example, Patent Document 1). ).
[0010]
However, these light emitting diodes have low light emission energy and have not yet been used as a light emitting tube of a flash light emitting device in place of a light emitting tube such as a xenon tube.
[0011]
[Patent Document 1]
Japanese Patent No. 3087742
[0012]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a camera including a flash light emitting device that can improve the use efficiency of flash light and can reduce the size of an arc tube and the size of a main capacitor.
[0013]
[Means for Solving the Problems]
The flash light emitting device of the present invention that achieves the above object is a camera for photographing a subject,
Equipped with a flash light emitting device that emits a flash in synchronization with the shooting,
The flash light emitting device emits flash light upon receiving electric power, a reflector for reflecting forward the flash light excluding the flash light emitted forward from the light emitted from the light emitting tube, and the reflector And a protector that covers the front surface of the arc tube and the reflector and emits flash light emitted from the arc tube forward, and is reflected by the reflector and emitted forward from the protector. A material in which a fluorescent material that emits fluorescence having a wavelength in the visible light region is applied or added is disposed on the optical path of the flashlight.
[0014]
According to the camera of the present invention, the flash light emitted from the arc tube is applied to the fluorescent material on the optical path of the flash light. For this reason, the flash including the fluorescence emitted from the fluorescent material is emitted from the protector. Since the fluorescent material emits fluorescence having a wavelength in the visible light range, the light emitted from the protector is light whose amount of light in the visible light range is increased. At this time, light having a wavelength outside the visible light region greatly contributes to the fluorescence action, as if the light outside the visible light region is converted into light having a wavelength within the visible light region. As a result, the amount of light emitted from the arc tube increases in the visible light region, and the light whose amount of light outside the visible region decreases is emitted as a flash light from the protector, so that the utilization efficiency of the arc tube is increased.
[0015]
As a result, it is possible to reduce the electric power of the arc tube and the capacity of the main capacitor.
[0016]
The fluorescent material is preferably composed mainly of yttrium aluminum garnet.
[0017]
When the above-mentioned fluorescent material containing yttrium aluminum garnet as a main component is used, the wavelength of light emitted by the fluorescent action becomes light in a wavelength band of 470 nm to 650 nm. Then, light from the blue wavelength band (440 nm to 500 nm) to the red wavelength band (610 nm to 700 nm) is emitted by the fluorescence, and the light whose amount of light in the visible light region has increased by the amount of the fluorescence becomes a flash. It is emitted from the protector.
[0018]
Thus, when light having an increased amount of light having a wavelength in the visible light region becomes a flash light and emitted from the protector, the light amounts of R light, G light, and B light in the visible light region increase, which are necessary for photographing. A flash with an increased amount of light is emitted toward the subject. As described above, when the light emission distribution of the arc tube itself is converted into the light emission distribution including the fluorescence, the utilization efficiency of the arc tube is increased.
[0019]
The fluorescent material may be applied anywhere as long as it is in the path from the arc tube to the protector, and may be applied on the surface of the reflector or the surface of the arc tube. The surface of the protector may be used. In addition, a fluorescent material may be applied to the protector, the reflector, and the arc tube, but it is also possible to use a material made of a material in which a fluorescent material is added to the arc tube and the protector. At this time, it is not necessary to apply a fluorescent material, and an arc tube or a protector made of a material to which the fluorescent material is added may be used as it is. At this time, there is an effect that the assembling work of the flash light emitting device is reduced by the amount of the application process.
[0020]
When applying the flash light emitting device to this camera,
An image sensor that captures a subject image and generates image data;
A white balance adjustment circuit that adjusts the white balance including the fluorescence emitted by the fluorescent material at the time of flash emission shooting in which flash light is emitted from the flash light emitting device in synchronization with shooting, and the white balance adjustment circuit Therefore, it is desirable to adjust the white balance including the fluorescence emitted by the fluorescent material during flash photography.
[0021]
When the flash light emitting device is applied to a camera, the light emission distribution characteristic of the flash light emitted from the protector at the time of flash light emission changes to the one including the fluorescence. Adjust the white balance.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
The configuration of a digital camera that is an embodiment of the present invention will be described below. The appearance of this digital camera is the same as that shown in FIG. FIG. 3 is a block diagram showing the configuration of the digital camera.
[0023]
The configuration of this camera will be briefly described with reference to FIG.
[0024]
The camera 100 is controlled by a main CPU 101, and the main CPU 101 controls the operation of the entire camera according to a program procedure stored in a ROM (not shown). A RAM (not shown) stores variables indicating the progress of the processing of the camera according to the processing when the entire camera is controlled according to the procedure of the program. Further, the camera 100 is provided with a flash memory 102 in which correction data for white balance adjustment described later is stored.
[0025]
First, the flow of image data when shooting is performed by the camera 100 will be described.
[0026]
The camera 100 includes an image sensor 103 that captures a subject image, and a lens 104 for forming a subject image on the image sensor 103 is built in the lens barrel. A diaphragm 105 is provided between the image sensor 103 and the lens 104, and the opening of the diaphragm 105 is adjusted based on an instruction from the main CPU 101.
[0027]
After the aperture of the diaphragm is adjusted by the main CPU 101, a subject image is formed on the photographing element 103 by the lens 104, and image data based on the formed subject image is generated by the imaging element 103.
[0028]
A timing signal is supplied to the image sensor 103 from a timing generator 106 controlled by the main CPU 101, and image data based on the subject image formed in the image sensor 103 by the timing signal is read to the analog signal processing unit 107. It is.
[0029]
The image sensor 103 has a large number of pixels arranged vertically and horizontally, and among these many pixels arranged vertically and horizontally, a drive signal (hereinafter referred to as an H signal) for sequentially reading out the charge of each pixel arrayed in the horizontal direction. And a vertical scanning register for supplying a drive signal (hereinafter referred to as a V signal) for sequentially reading out the charges of the pixels arranged in the vertical direction. By supplying a drive signal to one of the pixels from the vertical scanning register and the horizontal scanning register, the charges of the pixels arranged in the vertical and horizontal directions are sequentially read out as RGB signals. The driving signal that gives the reading timing of each pixel arranged in the horizontal direction is a two-phase signal of H1 signal and H2 signal, and the driving signal that gives the reading timing of each pixel arranged in the vertical direction is from V1 signal to V4 signal. It is a four-phase signal. Further, a reset signal RS is also supplied together with the H1 signal and the H2 signal in order to reset the state of the pixel once before reading out the charge of each pixel arranged in the horizontal direction and then accumulate the charge in each pixel.
[0030]
As described above, the image data is read from the image sensor 103 based on the H1 signal, the H2 signal, and the drive signals from the V1 signal to the V4 signal, and is supplied to the subsequent analog signal processing circuit 107. Here, since the release operation has not been performed, the image data corresponding to all the pixels of the image sensor 103 is read out without being read out.
[0031]
The read signal is supplied to the analog signal processing circuit 107, noise is reduced, and the RGB signal of the analog signal subjected to the noise reduction is supplied to the A / D conversion circuit. The A / D conversion circuit 108 converts the image data composed of RGB signals of analog signals into image data composed of RGB signals of digital signals, and the image data composed of RGB signals of the converted digital signals is further converted into digital signals in the subsequent stage. It is supplied to the processing unit 109. The digital signal processing unit 109 includes a video signal processing unit, an AF (Auto Focus) detection unit, a luminance detection unit, a white balance adjustment unit, and the like. The video signal processing unit converts image data composed of RGB signals into image data composed of YC signals. The luminance detection unit extracts a signal indicating luminance and contrast from the RGB signal. Further, the white balance adjustment unit adjusts the dynamic range of each of the R, G, and B signals.
[0032]
In FIG. 3, the white balance adjustment unit which is a characteristic part of the invention is taken out and described as the white balance adjustment circuit 110, and image data is exchanged with other signal processing units excluding the white balance. The white balance adjustment unit is described as follows.
[0033]
Signals converted from RGB signals to YC signals by the video signal processing unit in the digital signal processing unit 109 are stored in the memory 111, and image data in the memory 111 is supplied to the LCD controller 112, and the LCD of the LCD 112 is displayed. An image representing the subject image is displayed on panel 114.
[0034]
While the release operation is not performed, image data is read from the image sensor 103 at predetermined intervals, and an image representing a subject image is displayed on the LCD panel 114 as a through image. This LCD panel 114 is a touch panel type, and when a menu or the like is displayed, the menu can be selected by touching a selection item in the menu.
[0035]
Here, when the release button 2 (see FIG. 1) in the operation unit 2a is pressed, the image data generated by the image sensor 103 when the release operation is performed is recorded in the memory card 116. At this time, all pixel data is read out and compressed by the compression / decompression unit 115 before image data is recorded in the memory card 116. Further, it is configured to be reproducible. For example, when the mode is switched to the replay mode, the image data recorded on the memory card 116 is read and displayed on the LCD panel 114. At this time, the compressed and recorded image data is expanded by the compression / expansion unit 115 and then supplied to the LCD 113.
[0036]
The camera 100 is also equipped with a flash light emitting device 120 that emits a flash when the luminance detection unit described above has a low field luminance.
[0037]
The flash light emitting device 120 is provided with a xenon tube 6 as a light emitting tube. When a flash instruction is given from the main CPU 101, flash light is emitted from the xenon tube 6.
[0038]
FIG. 4 is a diagram showing the configuration of the flash light emitting device in FIG.
[0039]
As shown in FIG. 4, the flash light emitting device 120 includes a xenon tube 6, and various circuits for causing the xenon tube 6 to emit flash light are provided.
[0040]
The flash light emitting device 120 includes a xenon tube 6, a main capacitor MC for supplying electric power to the xenon tube 6, a trigger circuit 121 for exciting xenon gas filled in the xenon tube 6, A CPU 122 that issues a light emission instruction to the xenon tube 6 based on a signal from the main CPU 101, and a switching transistor IGBT for causing the xenon tube 6 to perform flash emission based on the light emission instruction from the CPU 122 are provided.
[0041]
The CPU 122 communicates with the main CPU 101, and a flash instruction is supplied via the communication path when it is determined that the main CPU 101 has low luminance. A DC / DC converter 123 for charging the main capacitor MC is also provided. The current is amplified by the step-up transformer of the DC / DC converter 123, and the amplified current is supplied to the main capacitor MC. Yes. When current is supplied to the main capacitor MC by the DC / DC converter 123 and charging is performed, a charge ON signal is supplied from the CPU 122 to the DC / DC converter 123 and charging is performed. Since the voltage of the main capacitor MC is detected by the voltage monitor circuit 124 formed of a resistance dividing circuit when charging is performed by the DC / DC converter 123, the voltage of the main capacitor MC detected by the voltage monitor circuit 124 is detected. Is detected by the CPU 122, a charge OFF signal is supplied from the CPU 122 to the DC / DC converter 123. When a signal indicating the voltage of the main capacitor MC is supplied from the voltage monitor 124 to the CPU 122, a signal converted into a digital signal by the AD unit is supplied. Further, the flash memory 128 stores data for correcting the light emission time according to the shooting situation.
[0042]
Further, the camera 100 is provided with a dimming circuit 125, and when the flash light is emitted, the phototransistor 126, which is a dimming sensor whose light emission amount reacts to the light of the flashlight, operates, and the current flowing through the phototransistor flows. A photometric quantity is detected by integrating with the integrating capacitor Ct. When the photometric circuit 125 determines that the detected photometric quantity has reached a predetermined value, the gate of the switching transistor IGBT is cut off.
[0043]
The characteristics of the present invention will be described with reference to a configuration around the xenon tube 6 incorporated in the flash light emitting device 120.
[0044]
FIG. 5 is a view of the configuration of the light emitting portion around the xenon tube 6 as viewed from the front, and FIG. .
[0045]
Here, as shown in FIG. 6, the fluorescent material 130 is applied to the protector 5, the xenon tube 6 and the reflector 7. Except for this point, the configuration is the same as that of FIG. The fluorescent material applied here is mainly composed of yttrium aluminum garnet (hereinafter YAG). This is an arrangement in which a fluorescent material 130 that emits fluorescence having a wavelength in the visible light region is applied on the optical path of the flash light emitted from the xenon tube 6 and reflected by the reflector 7 and emitted forward from the protector 5. It is to do. Further, since the fluorescent material is also applied to the protector, flash light directly emitted forward from the arc tube is always irradiated to the fluorescent material. By irradiating the fluorescent material 130 with flash light in this way, fluorescence having a wavelength (450 to 650 nm) in the visible light region is emitted from the fluorescent material 130. When this fluorescence is emitted, mainly light having a wavelength outside the visible light region largely contributes, and light having a wavelength outside the visible light region is converted into light having a wavelength within the visible light region.
[0046]
Here, the fluorescent paint is applied to both the protector 5 and the reflector 7, but a fluorescent material may be applied to either the protector 5 or the reflector 7. The fluorescent material may be applied to the tube surface of the xenon tube 6 or the fluorescent material may be applied to the inner surface of the xenon tube 6. The fluorescent material 130 is preferably applied uniformly to the surface of the protector 5 or the surface of the reflector 7.
[0047]
Further, when a material to which a fluorescent material is added is used as the material of the tube portion of the xenon tube, it is not necessary to apply the fluorescent material to the xenon tube. The same applies to the case where a material to which a fluorescent material is added is used as the protector material. In this case, it is not necessary to apply a fluorescent material to the surface of the xenon tube and the surface of the protector, and there is an effect that the assembling work becomes easy.
[0048]
In this way, when the material with the fluorescent material 130 applied or added is disposed on the optical path of the flash light from when the flash light is emitted from the xenon tube 6 until it is emitted from the protector 5, the flash material 130 is irradiated with the flash light. As a result, a flash including the fluorescence emitted from the fluorescent material 130 in the flash emitted from the xenon tube 6 can be emitted from the protector 5. Here, since the fluorescent material containing YAG as a main component is used as the fluorescent material, the fluorescent wavelength band is 450 nm to 650 nm, and the flash light with the increased light amount in the visible light region of the wavelength band is emitted from the protector 5. Is done.
[0049]
In this way, light with a wavelength outside the visible light range is reduced and converted to light with a wavelength within the visible light range, and the amount of light in the visible light range increases, so if it is left outside the visible light range that was wasted radiation Can be used to promote the fluorescent action, and a flash with improved utilization efficiency can be directed toward the subject.
[0050]
When deploying a flash light emitting device that can irradiate the subject with a flash with improved utilization efficiency, the flash including the fluorescent light is emitted toward the subject, so the xenon is smaller than before. Even if a tube is used, the same flash as before can be obtained. If the xenon tube is downsized, the capacity of the capacitor that supplies power to the xenon tube can be reduced, and the entire flash light emitting device can be downsized. Furthermore, the camera in which this flash light emitting device is provided can also be reduced in size.
[0051]
However, when the flash including the fluorescence is emitted from the protector and irradiated toward the subject in this way, the light emission distribution characteristic of the flash is changed. When the light emission distribution characteristic of the flash changes in this way, a change appears in the color temperature. This color temperature is 6000 K for sunlight, 4500 K for room lights, and the mixing ratio of R light, G light, and B light is determined based on the color temperature, and the white color that is the reference color, that is, white The balance is adjusted.
[0052]
Therefore, when this flash light emitting device is applied to a digital camera, it is necessary to grasp in advance the change in color temperature accompanying the change in the light emission distribution characteristic of this flash light.
[0053]
FIG. 7 is a diagram showing a measurement system for measuring the color temperature of flash light emitted from a light emitting unit provided with a xenon tube coated with a fluorescent material, a reflector, and a protector.
[0054]
As shown in FIG. 7, the camera 100 is fixed to the tripod 50. A curtain 51 is stretched in front of the curtain 51, and flash emission is performed toward the curtain 51. The curtain 51 is provided with a color temperature sensor 52, and data indicating the color temperature detected by the color temperature sensor 52 is supplied to the color thermometer 53 to measure the color temperature.
[0055]
The measurement result of the color thermometer 53 is received by the personal computer 54, and the received color temperature data is written in the flash ROM 102 of the camera 100. Then, the gains of the R signal, the G signal, and the B signal of the image data composed of RGB are adjusted based on the color temperature written in the flash ROM 102 when the camera 100 performs shooting with flash. The white balance is adjusted and the color is adjusted.
[0056]
Here, the light emission distribution of a single xenon tube and what effect the light emission distribution has on the fluorescent material will be described with reference to FIG.
[0057]
FIG. 8 is a diagram showing the light emission distribution characteristics and the light emission distribution × luminosity exhibited by a single xenon tube. The horizontal axis indicates the wavelength, the left vertical axis indicates the relative light emission energy corresponding to the amount of emitted light, and the right vertical axis indicates the visibility.
[0058]
A curve A in FIG. 8 is a curve showing the light emission distribution of a single xenon tube, and a curve B in FIG. 8 is a curve showing the standard visibility. A curve C obtained by multiplying the curve A and the curve B is shown as the characteristic of the visibility of the xenon tube alone. Curves D and E in FIG. 8 are curves showing the light emission distribution characteristics of the flash when the amount of light in the visible light region is increased by fluorescence. Curves D and E show how much the emission distribution characteristics change when the thickness of the fluorescent material varies. Curve D shows the lower limit and curve E shows the upper limit. Further, in the figure, arrows are respectively shown with signs of B, G, and R from the shorter wavelength so that it can be understood which part of the wavelength band of the R light, G light, and B light is.
[0059]
As can be seen from FIG. 8, in the light emission distribution characteristics of the flash light so far, a brightness of about 0.4 is obtained as the visual sensitivity indicating the brightness of the flash light.
[0060]
This is an attempt to increase the relative light emission energy in the visible light region by converting the light emission distribution of the xenon tube itself with a fluorescent material.
[0061]
As can be seen from FIG. 8, curve D and curve E, which show the emission distribution characteristics including fluorescence, are less in the amount of light outside the visible light range than curve A, which is the emission distribution characteristic of the xenon tube alone, and in the visible light range. The amount of light having a wavelength is increased. Here, if the thickness of the fluorescent material can be made uniform, it is possible to increase the amount of light up to about 0.6 in terms of relative light emission energy. In addition, the brightness up to about 0.6 can be increased in terms of visibility.
[0062]
As described above, it is possible to irradiate the subject with brighter flashlight by changing the light emission distribution characteristics of the flashlight using the fluorescent action by the fluorescent material. In addition, light with a wavelength outside the visible light range is effectively used to increase the amount of light in the visible light range, so that the flash utilization efficiency is improved, and the xenon tube can be made smaller and the capacity of the main capacitor can be made smaller. it can. Further, even if the light emission power of the xenon tube is reduced, the same light emission distribution characteristics as before can be obtained, so that it is possible to use a xenon tube having a light emission power that is slightly smaller.
[0063]
In the above description, the example in which the fluorescent material is applied to the tube surface of the xenon tube 6 is described. However, instead of the application, a conductive resin having the fluorescent material may be wound around the xenon tube.
[0064]
FIG. 9 shows an example in which a conductive resin 6 a having a phosphor is wound around a xenon tube 6.
[0065]
In this way, there is an advantage that the thickness of the conductive resin 6a having a phosphor can be kept uniform and the operation is simplified.
[0066]
As described above, when the use efficiency of the flash light is increased, it is possible to reduce the size of the arc tube and the size of the main capacitor, thereby reducing the size of the entire flash light emitting device. In addition, the overall size of the flash light emitting device can be reduced, so that the size of the entire camera can be reduced.
[0067]
【The invention's effect】
As described above, according to the camera of the present invention, it is possible to provide a camera provided with a flash light emitting device that can improve the flash utilization efficiency, reduce the size of the xenon tube, and reduce the size of the main capacitor. Can do.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an appearance of a camera including a flash light emitting device.
2 is a view showing a xenon tube and a reflector disposed inside the light emitting window of FIG. 1; FIG.
FIG. 3 is a block diagram showing a configuration of a camera showing an embodiment of the present invention.
4 is a diagram showing a configuration of a flash light emitting device in FIG. 3. FIG.
FIG. 5 is a diagram showing a xenon tube and a reflector used in the flash light emitting device of the camera of the present embodiment.
6 is a cross-sectional view taken along the line AA in FIG.
7 is a diagram showing a measurement system for measuring a color temperature written in the flash memory 102 of FIG. 3. FIG.
FIG. 8 is a diagram showing a light emission distribution characteristic of a flash of a single xenon tube and a light emission distribution characteristic of a flash obtained by adding fluorescence.
FIG. 9 is another configuration example in which a phosphor is arranged in a flash path.
[Explanation of symbols]
1 Camera
1a Camera body
2 Release button
3 Lens barrel
4 Light emission window
5 Protector
6 Xenon tube
7 Reflector
100 cameras
101 CPU
102 flash memory
110 White balance adjustment circuit
120 Flash light emitting device

Claims (6)

In a camera that shoots a subject,
Equipped with a flash light emitting device that emits a flash in synchronization with the shooting,
The flash light emitting device emits a flash when supplied with electric power, a reflector for reflecting forward the flash excluding the flash emitted from the light emitted from the light emitting tube, and the light emission A protector that covers the front surface of the tube and the reflector and emits flash light emitted from the arc tube forward, and that is emitted from the arc tube and reflected by the reflector and emitted forward from the protector. What is claimed is: 1. A camera comprising a flashing light path on which a fluorescent material that emits fluorescence having a wavelength in a visible light range is applied or added. The camera according to claim 1, wherein the fluorescent material is yttrium aluminum garnet. The camera according to claim 1, wherein the fluorescent material is applied to the reflector. The camera according to claim 1, wherein the fluorescent material is applied or added to the arc tube. The camera according to claim 1, wherein the fluorescent material is applied or added to the protector. This camera
An image sensor that captures a subject image and generates image data;
2. A white balance adjustment circuit for adjusting white balance including fluorescence emitted by the fluorescent material at the time of flash emission imaging in which flash light is emitted from the flash light emitting device in synchronization with imaging. The listed camera.

Images