JP2691356B2 - Fundus camera - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fundus camera, and more particularly, to a means for increasing the amount of light flux for photographing in fluorescence photographing as compared with general photographing. Regarding fundus camera.

(Prior Art) In a conventional fundus camera, an illumination light is projected onto a fundus of the eye to be examined through a ring-shaped peripheral region of a pupil of the eye to be examined by a ring-shaped diaphragm disposed at a position conjugate with an anterior segment of the eye to be examined, By removing and observing the fundus of the eye to be inspected through the central region of the eye, harmful reflected light from the cornea and the like is removed.

By the way, in these conventional fundus cameras, it is known that fundus illumination is performed with light in a specific wavelength range, and a blood vessel image generated by fluorescence emitted from a blood vessel of a subject injected with a fluorescent contrast agent is also observed and photographed. There is.

However, in the conventional fundus camera of this type, the light from the illumination light source is projected onto the fundus through a fluorescent exciter filter that transmits only light in a specific wavelength range, and as a result, a weak fluorescent light flux emitted from a fundus blood vessel is blocked. Since the light is passed through a filter and then is incident on the film for photography, the light amount at the time of observation and photography must be considerably higher than that at the time of general photography. Therefore, when these filters are inserted, the photographer increases the power supply voltage of the illumination light source for observation and photography, or removes the light shield inserted in the illumination system from the optical path, and The amount of light is increased to compensate for the shortage of the amount of light flux for photographing.

(Problems to be Solved by the Invention) However, the operation of increasing the light amount of the illumination light flux imposes a burden on the subject, and there is a limit to increase the light emission amount of the light source, and the light amount is insufficient. In some cases, it could not be supplemented. In particular, in the case of so-called instant camera fluorescence photography that can process light-sensitive materials in a short time, the screen size must be larger than that of 35 mm camera fluorescence photography, or because sensitized development is impossible, It was a win because the amount of illumination light per unit area was insufficient.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a fundus camera that can efficiently perform general photography and fluorescence photography with a simple operation and obtain a clear photography result.

(Means for Solving the Problem) In order to achieve the above object, the fundus camera of the present invention includes an illumination system that illuminates the fundus of the eye to be inspected with illumination light and an imaging system that images the fundus of the eye to be inspected. However, in the fundus camera for performing general photography and fluorescence photography by the photography system, it is characterized in that the aperture of the photography diaphragm provided in the photography system in fluorescence photography is made larger than in general photography.

(Example) Hereinafter, a fundus camera of an example of the present invention will be described with reference to the drawings. In FIG. 1, the fundus camera is an optical system 10
0, a photographing camera detection unit 200, an operation / display unit 300, a calculation control unit 400, and an interlocking linkage 500.

First, the optical system 100 will be described. The optical system 100 includes an illumination system 1 and a photographing / observation system 41.

<Illumination system> The illumination system 1 is arranged in front of the light source lamp 2 for observation, the condenser lens 3, the half mirror 4, and the condenser lens 3, and reflects only infrared light of the white light emitted from the light source lamp 2. An infrared cut filter 5, an exciter filter 6, an illumination diaphragm 12, a partial mirror 14, a reflecting mirror 16, and a relay lens 18 are sequentially arranged on the optical axis 8.

The exciter filter 6 is composed of 6a for visible fluorescence and 6b for infrared fluorescence. Exciter filter 6a for visible light
Is a filter that extracts the fluorescence excitation wavelength of 518 nm from the white light, and the exciter filter for infrared fluorescence 6b is a filter that extracts the fluorescence excitation wavelength of 750 nm from the white light. The exciter filters 6a and 6b are selectively inserted into and removed from the optical path according to the photographing mode. That is,
In visible light shooting mode, exciter filter 6a
Both 6 and 6b are out of the optical path. Next, in the visible fluorescence imaging mode, the visible fluorescence exciter filter 6a is inserted in the optical path. Finally, in the infrared fluorescence photographing mode, the infrared fluorescence exciter filter 6b is inserted in the optical path.

The infrared cut filter 5 is an exciter filter for visible fluorescence when the exciter filter 6b for infrared fluorescence is inserted into the optical path and is removed from the optical path in conjunction with this.
When 6a is inserted in the optical path, and when both exciter filters 6 are separated from the optical path, they are inserted in the optical path.

On the incident optical axis 20 of the half mirror 4, a condenser lens 24 and a flash tube 22 for photographing are arranged.
A first photoelectric converter 23 for measuring the amount of emitted light is arranged near 22. A second photoelectric converter 10 for measuring the amount of emitted light is also arranged near the light source lamp 2. Further, a condenser lens 32 and an infrared sensor 34 are arranged on the reflection optical axis 30 of the partial mirror 14. This infrared sensor 34 and the first photoelectric converter
The 23 and the second photoelectric converter 10 will be touched again in <Operation control section> which will be described later.

The light source lamp 2 is near the front focal point of the condenser lens 3, and the flash tube 22 is the condenser lens 24.
It is located near the front focal point. The illumination diaphragm 12, which will be described later in detail, is arranged at a position conjugate with the perforated mirror 40, which will be described later, with respect to the relay lens 18. Lighting system 1
Further includes a perforated mirror 40 of the imaging / observation system 41 and an objective lens 42, and illuminates the fundus F of the eye E to be inspected.

In the illumination diaphragm 12 described above, a ring slit plate 54 having a center hole 50 and a ring slit 52, and a circular hole diaphragm plate 58 having a circular hole 56 having a diameter substantially equal to the outer diameter of the ring slit 52 selectively emit light. It is configured to be inserted on the shaft 8. That is, in the visible light photographing mode, the ring slit plate 54 is inserted in the light path, and in the visible fluorescence photographing mode and the infrared fluorescence photographing mode, the circular aperture plate 58 is inserted in the light path at the time of photographing.

The partial mirror 14 is defined to have a size sufficient to allow the light flux passing through the center hole 50 of the ring slit plate 54 of the illumination diaphragm 12 to enter without being blocked.

<Photographing / observing system> The photographing / observing system 41 includes an objective lens 42, a perforated mirror 40, a photographing diaphragm 71, a barrier filter 74, a focusing lens 76, and an imaging lens 78 on an optical axis 70 passing through the optical examination eye E. , A first quick return mirror 80, and a 35 mm camera 82 are sequentially arranged. A second quick return mirror 86 is arranged on the reflection optical axis 84 of the first quick return mirror 80, and an instant camera 88 is arranged in front of it on a position conjugate with the 35 mm camera 82. Further, the TV camera 90 (the photographing surface of the TV camera 90) is arranged on the optical axis 84 and at a position conjugate with the instant camera 88 and the 35 mm camera 82. The output of the TV camera 90 is connected to the monitor TV 92. The perforated mirror 40 and the anterior segment of the fundus E of the eye to be inspected are arranged at positions substantially conjugate with the objective lens 42.

As shown in FIG. 2, the photographing diaphragm 71 has four circular aperture diaphragms 71a, 71b, 71c which are formed in a disc 72 and have different diameters.
And 71d. These circular aperture diaphragms are brought to a position on the optical axis 70 conjugate with the anterior segment of the eye E to be inspected with respect to the objective lens 42 by the operation of the rotary solenoid 73 attached to the center of the disc 72. The circular aperture stop is 71a, 71
The diameter is increased in the order of c, 71d, and 71b, but the reason is as described below.

In the case of shooting with the instant camera 88, it is inserted into the optical path when shooting with the instant camera 88 in order to compensate for the shortage of the amount of illumination light per unit area caused by the larger screen size than in the case of shooting with the 35 mm camera 82. The diameter of the circular aperture stop 71d must be larger than that of the circular aperture stop 71c that is inserted into the optical path when shooting with a 35 mm camera. That is, 71c <71d.

The TV camera 90 uses the light source lamp 2 which is a light source for observation both in fluorescence imaging and visible light imaging. On the other hand, the 35 mm camera and the instant camera 88 use the flash tube 22 for photographing at the time of fluorescence photographing. By the way, the white lamp 2, which is a visible light source, emits a smaller amount of light than the light source for photographing using the flash tube 22. Therefore, the aperture of the TV camera fluorescence photographing diaphragm 71b must be larger than that of the instant camera fluorescence photographing diaphragm 71d. That is, 71d <71b.

In addition, since the light emission amount of the light source lamp 2 is smaller than that of the flash tube 22, it is larger than the energy of visible fluorescence generated by the excitation wavelength contained in the white light emitted from the light source lamp, Visible light shooting diaphragm 71a
Must be smaller than the 35mm camera Fluorescent 71c. That is, 71a <71c.

As described above, the photographing modes include the visible light photographing mode, the visible fluorescence photographing mode, and the infrared fluorescence photographing mode.

In the visible light photographing mode, any one of the 35 mm camera 82, the instant camera 88 and the TV camera 90 is selected. In this mode, the circular aperture stop 71a is commonly used for the three cameras.

Also in the visible fluorescence photographing mode, any one of the 35 mm camera 82, the instant camera 88 and the TV camera 90 is selected. However, in this mode, when shooting, the circular aperture stop 71c for the 35mm camera 82, the circular aperture stop 71d for the instant camera 88, and the TV camera 90 are used.
For, a circular aperture stop 71b is used. In this mode, the circular aperture stop 71a is commonly used during focusing.

Finally, in the infrared shooting mode, the only camera that can be selected is the TV camera 90, not the 35mm camera 82 and the instant camera 90. In this mode, the circular aperture stop 71b is used in combination with the TV camera 90.

The barrier filter 74 is 74a for visible fluorescence.
And 74b for infrared fluorescence. The barrier filters 74a and 74b are interlocked with the exciter filters 6a and 6b,
It is configured so that it can be selectively inserted into and removed from the optical path. That is, in the visible light shooting mode, the barrier filter 74
Both a and 74b are out of the optical path. Next, in the visible light shooting mode, the barrier filter 74 for visible fluorescence is used.
a is inserted in the optical path. Finally, in the infrared fluorescence photographing mode, the infrared fluorescence barrier filter 74b is inserted in the optical path.

<Photographing camera detection unit> The photography camera detection unit 200 can be attached to the fundus camera.
Among the types of cameras, that is, the 35 mm camera 82, the instant camera 88, and the TV camera 90, the type of camera that is set to be photographable is detected. The shooting camera detection unit 200
In FIG. 3 mainly showing the configuration of the arithmetic / control unit 400, it is shown outside the rectangle represented by the broken line in a triple frame, and the details of its function will be apparent from the description of <arithmetic / control unit> described later. Becomes

<Operation / Display Unit> The operation / display unit 300 includes a shooting mode selector switch 301 for selecting one shooting mode from among visible light shooting mode, visible fluorescence shooting mode, and infrared fluorescence shooting mode.
Light quantity control knob with switch 302 for blinking the light source lamp 2 which is the light source for observation, light quantity control knob with switch for blinking the flash tube 22 for photographing which is the light source for photographing
322 and an infrared fluorescent exciter filter life indicator meter 330 for indicating deterioration of the infrared fluorescent exciter filter. The above various elements of the operation display are
In FIG. 3 mainly showing the configuration of the control unit 400, it is displayed outside the rectangle represented by the broken line in a double frame,
The details of the function will be clarified by the description of <arithmetic / control section> described later.

<Arithmetic and Control Unit> The arithmetic and control unit 400 includes the type of camera detected by the photographing camera detection unit 200 and the photographing mode selection switch 30 as shown in a rectangle indicated by a dotted line in FIG.
Corresponding to the proper amount of light emission of the flash tube 22 for photographing, which is determined by the photographing mode selected by 1 and one of the circular aperture diaphragms, which selects one of the circular aperture diaphragms, which is determined by the selected photographing mode and the detected photographing camera. Of the photographing reference value generating circuit 206 for generating the photographing reference value, the irradiation reference value generating circuit 208 for generating the irradiation reference value corresponding to the maximum irradiation allowable amount of the infrared fluorescence of the eye E, and the exciter filter 6b for infrared fluorescence. Reference transmittance signal generating circuit 210 for generating a reference transmittance signal serving as a reference for determining deterioration, first control circuit 2
12, second control circuit 214, first comparison circuit 216, second comparison circuit
218, the third comparison circuit 220, the storage device 222, and the dotted line and Included is an interlocking linkage drive circuit 224 for driving the interlocking linkage 500 labeled as.

Shooting mode selector switch 301 and shooting camera detector 200
Is connected to the shooting aperture selection circuit 204. The output of the photographing aperture selection circuit 204 is connected to the interlocking linkage drive circuit 224, and the interlocking linkage drive circuit 224 drives the interlocking linkage 500 so that the selected circular aperture photographing aperture (7
One of 1a, 71b, 71c and 71d)
To the position on the optical axis 71 (see FIG. 1).

Next, a sequence for selecting the photographing aperture will be described with reference to FIGS. 3 and 4. Shooting aperture selection circuit 204
Receives the output from the photographing mode selector switch 301, and if this is the visible light photographing mode, selects the visible light photographing diaphragm 71a regardless of the output signal from the photographing camera detection unit 200 which is another input. Then, this is inserted into the optical path, and this sequence ends.

When the input signal from the photographing mode selector switch 301 is not the visible light photographing mode but either the visible fluorescence photographing mode or the infrared fluorescence photographing mode, the input received from the photographing camera detection unit 200 which is another input. The signal determines the aperture to be selected. That is, the photographing camera detection unit 20
When the input signal from 0 indicates that the TV camera is set, the shooting aperture selection circuit 204 sets the TV
The camera fluorescence photographing diaphragm 71b is selected and inserted into the optical path, and this sequence ends.

If the input signal from the photographing camera detection unit 200 does not indicate that the TV camera is set, the process proceeds to the next step. That is, when the input signal from the photographing camera detection unit 200 indicates that the camera set at this time is a 35 mm camera, the photographing diaphragm selection circuit 204 selects the 35 mm camera fluorescence photographing diaphragm 71 c. This is inserted in the optical path, and this sequence ends.

When the set camera is not a 35mm camera,
The set camera is nothing but an instant camera. At this time, the photographing aperture selection circuit 204 selects the instant camera fluorescence photographing diaphragm 71d and inserts it into the optical path, and this sequence ends.

Returning to FIG. 3, the shooting mode selector switch 301 and the shooting camera detection unit 200 are connected to the shooting reference value generation circuit 206. The output of the photographing reference value generation circuit 206 is connected to the first comparison circuit 216, and the output of the first photoelectric converter 23 described above is connected to the first comparison circuit 216. The first comparison circuit 216 compares the output of the first photoelectric converter 23, which is proportional to the light emission amount of the flash tube 22, with the output of the photographing reference value generation circuit 206, and generates a difference between the two outputs. The first control circuit 212 adjusts the light emission amount of the photographing flash tube 22 so that the difference output becomes 0, and sets it to the light emission amount corresponding to the photographing reference value. The light amount adjustment within a predetermined range for each shooting reference value is performed by the flash tube light amount adjustment knob 322.

The infrared sensor 34 described above is connected to the light source lamp 2 via the second comparison circuit 218 and the second control circuit 214. The second comparison circuit 218 also includes an irradiation reference value generation circuit 2
08 output is connected. This irradiation reference value generation circuit 20
Reference numeral 8 supplies a reference value corresponding to the maximum irradiation amount of infrared light of the eye E to be inspected to the second comparison circuit 218. The irradiation reference value generated by the irradiation reference value generation circuit 208 is stored in advance in the storage device 222.
Shall be stored in memory. The second comparison circuit 218 compares the signal proportional to the infrared emission amount from the infrared sensor 34 with the reference signal from the irradiation reference value generation circuit 208, and the received light accumulation amount of the infrared sensor 34 is the maximum irradiation allowable amount. When it is determined that the light source lamp 2 has exceeded the limit, the second control circuit 214 controls to stop the lighting of the light source lamp 2 or to set the safe light amount. The light source lamp 2 blinks and the light amount is adjusted by the light source lamp light amount adjusting knob 302.

The output of the second photoelectric converter 10 described above is connected to the light quantity comparison circuit 220 which is the third comparison circuit. Further, the output of the reference transmittance signal generating circuit 210 and the output of the infrared sensor 34 are connected to the light quantity comparison circuit 220. In addition,
The reference transmittance generated by the reference transmittance signal generating circuit is stored in the storage device 222 in advance. Further, the output of the light quantity comparison circuit 220 is connected to the display meter 330. The light amount comparison circuit 220 compares the ratio between the output of the infrared sensor 34 and the output of the second photoelectric converter 10 that measures the light emission amount of the light source lamp 2 with the reference value that is the output of the reference transmittance signal generation circuit 210. However, when there is a difference of a predetermined value or more, it is determined that the infrared fluorescent exciter filter 6b has deteriorated and a deterioration signal is supplied to the display meter 330, and the display meter 330
Indicates that the exciter filter 6b for infrared fluorescence has deteriorated.

<Interlocking linkage> In Fig. 1, the dotted line The interlocking linkage 500 displayed as above is, as described in part with reference to FIG.
In response to the signal from 200, the shooting aperture (one of 71a, 71b, 71c and 71d) selected by the shooting aperture selection circuit 204 is inserted on the optical axis 70 via the interlocking linkage drive circuit 224. As shown in Table 1, the selection of the illumination diaphragm 12 (the ring slit plate 54 or the circular aperture diaphragm plate 58 is selected and inserted on the optical axis 8), the light of the exciter filter 6a for visible fluorescence and the exciter filter 6b for infrared fluorescence are selected. Insertion / removal of the axis 8; insertion / removal of the visible fluorescence barrier filter 74a and infrared fluorescence barrier filter 74b with respect to the optical axis 70; insertion / removal of the infrared transmission filter 5 with respect to the optical axis 8; and rotation of the quick return mirrors 80 and 88. The movement and the return are interlocked.

Next, the operation of the fundus camera having the above configuration will be described.

<Visible light shooting> By setting the shooting mode switch 301 to the “visible light shooting” position, the exciter filter for visible light 6a
And the infrared exciter filter 6b from the optical axis 8,
Further, the visible light barrier filter 74a and the infrared fluorescence barrier filter 74b are separated from the optical axis 70, and the visible light photographing diaphragm 71a is inserted on the optical axis 70, and the ring slit plate 54 is inserted on the optical axis 7. .

Then, the light source lamp 2 is turned on with a small amount of light, and the amount of light emission is increased by turning the amount-of-light adjustment knob 302, and focusing is performed while watching the image on the monitor TV 92. At this time, the quick return mirror 80 is in the position shown by the solid line in the figure, and the quick return mirror 86 is in the position shown by the dotted line in the figure. After focusing, the photographing flash tube 22 is turned on to perform photographing. However, TV
In the case of the camera 90, the light source lamp 2 used for focusing is used.

In the case of the 35 mm camera 82, the quick return mirror 80 is placed at the position indicated by the dotted line in the figure for shooting.

In the case of the instant camera 88, both the quick return mirror 80 and the quick return mirror 86 are placed at the positions shown by the solid lines in the figure for shooting.

In the case of the TV camera 92, the light source lamp 2 is turned on, the quick return mirror 80 is placed at the position shown by the solid line, and the quick return mirror 86 is placed at the position shown by the dotted line, and an image is taken.

<Visible Fluorescence Photography> By placing the photography mode selector switch 301 in the “visible fluorescence photography” position, the exciter filter 6a for visible fluorescence is inserted on the optical axis 8 and the barrier filter 74a for visible fluorescence is inserted on the optical axis 70. At the same time, the ring slit plate 54 of the illumination diaphragm 12 is inserted on the optical axis 8, and the quick return mirror 80
To the position shown by the solid line, and the quick return mirror
86 is placed at the position shown by the dotted line, the light source lamp 2 is turned on with a small amount of light, and focusing is performed while increasing the amount of emitted light and watching the image on the monitor TV 92.

After focusing, photographing is performed. In the case of the 35 mm camera and the instant camera 88, the photographing flash tube 22 is turned on, and in the case of the television camera 90, the light source lamp 2 is turned on to perform photographing.
Further, at the time of photographing, the ring slit plate 54, which was inserted on the optical axis 8 at the time of focusing, is removed from the position on the optical axis 8, and the circular aperture plate 58 is inserted on the optical axis 8. The visible fluorescence of 518 nm reflected from the anterior segment of the eye E enters the photographing / observation system 41. However, since all of the incident light is blocked by the visible fluorescence barrier filter 74a, nothing is taken for photographing. It has no effect.

35mm camera 82, 35mm camera fluorescent photography diaphragm 71
Using c, the quick return mirror 80 is moved from the position shown by the solid line to the position shown by the dotted line at the time of focusing and shooting is performed.

In the case of the instant camera 88, the instant camera fluorescence photographing diaphragm 71d is used, and the quick return mirror 86, which was at the position indicated by the dotted line at the time of focusing, is moved to the position indicated by the solid line, and photographing is performed.

In the case of the TV camera 90, the TV camera fluorescence photographing diaphragm 71b is used, and photographing is performed with the quick return mirrors 80 and 86 remaining in the in-focus position.

As described above, unlike the case of the visible light imaging described above, the circular aperture diaphragm plate 58 is used in place of the ring slit plate 54 necessary for removing the light reflected by the anterior segment of the eye E, and additionally visible Since the circular aperture stop 71c, 71d or 71b having a larger aperture diameter than the photographic stop 71a used for optical shooting is used, the light emission amount of the flash tube 22 for shooting or the light source lamp 2 should be used effectively. You can

<Infrared fluorescence shooting> By placing the shooting mode selector switch 301 in the position of “infrared fluorescence shooting”, the exciter filter 6b for infrared fluorescence shooting is placed on the optical axis 8 and the barrier filter for infrared fluorescence shooting 74
While inserting b on the optical axis 70, the ring slit plate 54 of the illumination diaphragm 12 is also inserted on the optical axis, and the diaphragm for TV camera fluorescence photography is inserted.
71b is inserted on the optical axis 70, the quick return mirror 80 is in the position shown by the solid line, and the quick return mirror 86
Is placed at the position indicated by the dotted line, the light source lamp 2 is turned on with a small amount of light, and the amount of light emitted is increased while focusing is performed while watching the image on the Seniter TV 92. After focusing, the ring slit plate 54 is removed from the position on the optical axis 8, and the circular aperture plate 58 is inserted on the optical axis 8 to perform photographing.

At this time, unlike the case of visible light imaging described above, the eye E
A circular aperture diaphragm 58 is used instead of the ring slit plate necessary for removing the light reflected by the anterior segment of the eye, and a circular aperture diaphragm having a larger aperture diameter than the photographic diaphragm 71a used during visible photography. Since 71b is used, the amount of light emitted from the light source lamp 2 can be effectively used. The infrared fluorescence reflected from the anterior segment of the subject's eye E enters the photographing / observation system 41, but since all of the incident light is blocked by the infrared fluorescence barrier filter 74b, nothing is taken for photographing. It has no effect.

Further, the amount of infrared light applied to the eye E is always detected by the infrared sensor 34, and when the second comparison circuit 218 determines that this amount exceeds the predetermined amount, the second control circuit 214 operates. Lighting of the light source lamp 2 is stopped,
Or set to a safe light level.

Further, when the ratio of the incident light amount and the emitted light amount of the infrared fluorescent exciter filter 6b becomes larger than a predetermined value and the infrared fluorescent exciter filter 6b is deteriorated by the light amount comparison circuit 220, the display meter 330 is displayed. Is displayed to the effect that the exciter filter 6b for infrared fluorescence has deteriorated.
Based on this display, the examiner can deal with this by exchanging the exciter filter 6b for infrared fluorescence with a regular one.

(Effects of the Invention) As described in detail above, the fundus camera of the present invention is configured so that the size of the photographing aperture can be changed according to the property of the photographing recording material at the time of fluorescent photographing, There is an advantage that a photographed image can be obtained efficiently by a simple operation and a clear photographed image can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a fundus camera of the present invention,
FIG. 2 is a plan view of the shooting diaphragm, FIG. 3 is a block diagram mainly showing the configuration of the arithmetic control unit, and FIG. 4 is a flow chart showing the order in which the shooting diaphragm is selected. 1 …… Illumination system 41 …… Shooting system 71 …… Shooting diaphragm 71a, 71b, 71c, 71d …… Shooting diaphragm aperture E …… Inspected eye F …… Ocular fundus

Claims (2)

(57) [Claims] 1. A fundus camera having an illumination system for irradiating the fundus of the eye to be inspected with illumination light and a photographing system for photographing the fundus of the eye to be inspected, and performing the general photographing and the fluorescence photographing by the photographing system. A fundus camera characterized in that an aperture of a photographing diaphragm provided in a photographing system is configured to be larger than that in general photographing. 2. The fundus camera according to claim 1, wherein the size of the aperture of the photographing diaphragm can be changed according to the type of the photographing recording member during fluorescence photographing.