JPH03221029A - Fundus camera - Google Patents

Abstract

PURPOSE:To facilitate operation to regulate a quantity of light while ensuring safety by regulating a quantity of illuminating light from a light source for observation in each of normal photographing, visible fluorescent photographing, and infrared fluorescent photographing through a regulating member having a regulating region responding to each mode. CONSTITUTION:A variable resistor 31 is mounted as a member to regulate a quantity of observation light during observation in relation to infrared photographing and regulate a quantity of illuminating light for observation of a light source 1 for observation during normal photographing, e.g. monocolor photographing, normal color photographing, a variable resistor 32 during observation in relation to visible fluorescent photographing by injecting fluorescent sodium as a luminescent material for visible photographing, and a variable resistor 33 during observation in relation to infrared ray fluorescent photographing by injecting indocyaningreen as a fluorescent material. Number 34 shows the slide control member of a quantity of observation light regulating member during normal photographing, 35 shows that of a quantity of observation light regulating member during fluorescent photographing, and 36 shows that of a quantity of observation light regulating member during infrared fluorescent photographing. For example, the variable resistor 31 is connected to a power source E through a mode switch 37 during normal photographing, and when the mode switch is turned ON, the voltage of the power source E is applied.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a fundus that can perform normal photography such as black-and-white photography and ordinary color photography, visible fluorescence photography by injecting a fluorescent agent, and infrared fluorescence photography. Regarding the camera.

(Prior Art) Fundus cameras that can perform normal photography such as black-and-white photography and normal color photography, as well as visible fluorescence photography by injecting a fluorescent agent, are conventionally known.

This type of fundus camera includes an observation light source for projecting observation illumination light onto the fundus during observation prior to photographing. During observation, if the amount of light reflected from the fundus based on the observation illumination light is too small or too large, the contrast of the obtained fundus image decreases, making it difficult for the examiner to see the fundus image well. Therefore, one observation illumination light amount adjusting member is provided to adjust the light amount of the observation illumination light, and the light amount of the observation illumination light is adjusted so that the fundus image can be clearly viewed.

(Problem to be Solved by the Invention) However, in this type of fundus camera, when trying to adjust the light amount of the observation illumination light using one observation illumination light amount adjustment member, the amount of light required for observation related to normal photography is reduced. Since the amount of observation illumination light required during observation related to visible fluorescence photography is greater than the amount of observation illumination light, the light amount adjustment range of the observation illumination light amount adjustment member becomes significantly wider.

In other words, when the observation light amount adjustment member is set in the adjustment area of the observation light source during observation related to normal photography, and the observation related to normal photography is performed, and after the normal photography is performed, the observation related to visible fluorescence photography is performed. The observation illumination light amount adjustment member, which is set in the adjustment area for observation related to normal photography, must be moved largely toward the adjustment area for observation related to visible fluorescence photography, which is cumbersome to operate. The same applies to the reverse operation.

Recently, fundus cameras that can perform not only visible fluorescence photography but also infrared fluorescence photography (so-called ICG photography) have been proposed;
(If you try to adjust the light intensity of the observation illumination light with If you perform observation related to visible fluorescence photography or normal photography while the camera is set in the photography adjustment area, an excessive amount of observation illumination light will be irradiated onto the human eye, resulting in damage to the human eye or damage to the imaging camera. This may cause problems such as receiving.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a fundus oculi that can easily adjust the amount of observation illumination light during observation not only for normal photography, visible fluorescence photography, but also for infrared fluorescence photography, while ensuring safety. The purpose is to provide cameras.

(Means for Solving the Problems) In order to achieve the above-mentioned purpose, the fundus camera according to the present invention is capable of performing normal photography such as black and white photography or normal color photography, visible fluorescence photography by injecting a fluorescent agent, and fluorescence photography. Equipped with each photography mode of infrared fluorescence photography by injecting the agent, the amount of observation illumination from the observation light source when observing the photographed image in each photography is adjusted by the normal observation light amount adjustment area that corresponds to normal photography. It is characterized in that the adjustment is performed through a member, a visible fluorescence observation light amount adjustment member having an adjustment region corresponding to visible fluorescence photography, and an infrared fluorescence observation light amount adjustment member having an adjustment region corresponding to infrared fluorescence photography. .

(Function) According to the fundus camera according to the present invention, when observing an image to be photographed in normal photography such as black-and-white photography or ordinary color photography, the amount of observation illumination light from the observation light source is adjusted by using the normal observation light amount adjustment member. Adjust. Further, when observing an image to be photographed in visible fluorescence photography with a fluorescent agent injected, the amount of observation illumination light from the observation light source is adjusted using the observation light adjustment member during visible fluorescence.

Furthermore, when observing an image to be photographed in infrared fluorescence photography with a fluorescent agent injected, the amount of observation illumination light from the observation light source is adjusted using an infrared fluorescence observation light amount adjustment member.

(Example) Hereinafter, an example of a fundus camera according to the present invention will be described with reference to the drawings.

In FIG. 1, A is an illumination system that illuminates the fundus of the eye to be examined;
B is a photographing system for photographing the fundus of the eye to be examined.

The optical system A1B is housed in an apparatus main body (not shown) installed on a pedestal that can be moved back and forth and left and right with respect to the base.

The illumination system A has a light source 1 for observation. In the case of observation related to normal photography such as black and white photography or color photography, the observation illumination light emitted from the observation light source 1 passes through a condenser lens 2 and an infrared filter 3 that cuts visible light and transmits only infrared light. The light is reflected by the diagonal half mirror 4 and illuminates the ring-shaped diaphragm 5.

Note that the adjustment of the amount of observation illumination light from the observation light source 1 will be described later.

The illumination system A is provided with a photographing light source 6.

This photographing light source 6 is connected to a photographing switch 105 shown in FIG.
It emits light when you operate it. The light from the photographing light source 6 passes through the condenser lens 7 and the diagonal half mirror 4 and illuminates the ring-shaped diaphragm 5. The light transmitted through the ring-shaped diaphragm 5 passes through the relay lens 21 , the oblique mirror 22 , and the relay lens 8 to the objective lens 1 facing the eye 11 to be examined.
The perforated mirror 9 obliquely installed on the optical axis of 0 is reached, and this perforated mirror 9
The light is reflected in the direction of the objective lens 1O, passes through the objective lens 1O, and illuminates the fundus 11a of the eye 11 to be examined.

The luminous flux reflected by the fundus 11a of the eye 11 to be examined passes through the objective lens 10. The objective lens 10 passes through the hole 9a of the perforated mirror 9.
The fundus image is formed on the surface of the film 14 by the focusing lens 12 and the imaging lens 13 provided on the front axis of the optical axis. In front of the film 14, a quick return roller 15 is provided so that it can be inserted into and removed from the optical path of the photographing system B, and is placed at the position shown by the solid line during observation and retracted to the position shown by the broken line during photography. There is.

During observation related to normal photography such as black-and-white photography and color photography, and during observation related to visible fluorescence photography and infrared fluorescence photography, which will be described later, the light flux from the fundus 11a is reflected upward by the quick return mirror 15 and passes through the field lens 16. A fundus image is formed above. This fundus image is relayed onto the photocathode of the imaging tube 19 by the oblique mirror 17 and the relay lens 18 and formed into an image. The photoelectric signal from the image pickup tube 19 is input to a monitor television 20, and a fundus image 20a is displayed on the screen of the monitor television 20.

The observation light source 1 is connected to variable resistors 31, 32, and 33. The maximum resistance value R2 of the variable resistor 32 is set smaller than the minimum resistance value R2 of the variable resistor 31, and the maximum resistance value R4 of the variable resistor 33 is set smaller than the minimum resistance value R2 of the variable resistor 31.
(See FIG. 2).

The variable resistor 31 serves as a normal observation light amount adjustment member that adjusts the amount of observation illumination light from the observation light source 1 during observation related to normal photography such as black and white photography and ordinary color photography. Further, the variable resistor 32 is used as a visible fluorescence observation light amount adjustment member that adjusts the light amount of the observation illumination light of the observation light source 1 during observation regarding visible fluorescence photography in which sodium fluorescein is injected as a visible fluorescent material, for example. plays the role of Furthermore, the variable resistor 33 is
It plays a role as an infrared fluorescence observation light adjustment member that adjusts the light intensity of the observation illumination light of the observation light source 1 during observation related to infrared fluorescence photography using indocyanine green injected as an infrared fluorescent material. .

Reference numeral 34 designates a slide operation member as an observation light amount adjustment member during normal conditions, 35 represents a slide operation member as an observation light amount adjustment member during visible fluorescence, and 36 represents a slide operation member as an observation light amount adjustment member during infrared fluorescence. .

The variable resistor 31 is connected via the mode switch 37 for normal photography, the variable resistor 32 is connected to the mode switch 38 for visible fluorescence photography, and the variable resistor 33 is connected to the mode switch 39 for infrared fluorescence photography. , are connected to power supply E, respectively. When each mode switch 37, 38, 39 is turned on, the voltage of power source E is applied.

When the visible fluorescence photography mode switch 38 is turned on, the exciter filter 23 for visible fluorescence photography is inserted into the optical path of the illumination optical system A, and the barrier filter 24 for visible fluorescence photography is inserted into the photography optical system B. . Also, when the mode switch 39 for infrared fluorescence photography is turned on, the exciter filter 23 for visible fluorescence photography is switched on from the illumination optical system A.
At the same time, the barrier filter 24 for visible fluorescence photography is evacuated from the optical path of the photographing optical system B, and at the same time, an exciter filter and a barrier filter for infrared fluorescence (not shown) are inserted into those optical paths. Ru.

When the slide operation member 34 is operated in the direction of the arrow shown in FIG. 1 with the normal shooting mode switch 37 turned on,
The amount of observation illumination light changes within region X shown in FIG. Further, when the slide operation member 35 is operated in the direction of the arrow shown in FIG. 1 with the visible fluorescence photography mode switch 38 turned on, the amount of observation illumination light changes within the region X2 shown in FIG. 2.

Furthermore, when the slide operation member 36 is operated in the direction of the arrow shown in FIG. 1 with the mode switch 39 for infrared fluorescence photography turned on, the light amount of the observation illumination light changes to the area X shown in FIG.
Changes within 3.

Therefore, by providing a light amount adjustment member to correspond to the light amount adjustment during observation related to normal photography, observation related to visible fluorescence photography, and observation related to infrared fluorescence photography, the light amount adjustment can be performed in each photography state. This can be done in a corresponding manner and reliably, and for example, it is possible to avoid the occurrence of an unexpected excessive amount of observation illumination light being irradiated onto the human eye. In addition, its operation is easy.

(Effects) Since the fundus camera according to the present invention is configured as described above, while avoiding the dangers when adjusting the light amount,
This has the effect that the light bag adjustment operation of the amount of observation illumination light can be performed reliably and easily during observation not only for normal photography and visible fluorescence photography but also for infrared fluorescence photography.

[Brief explanation of drawings]

FIG. 1 is an optical diagram showing the overall configuration of a fundus camera according to the present invention, and FIG. 2 is a graph showing the correspondence between the amount of observation illumination light and the adjustment range. l...Observation light source 31.32.33...Variable resistor 34.35.36...Slide operation member Fig. 2 71, 1fttR1

Claims (1)

[Claims of Patents] Equipped with various photographing modes: normal photography for black-and-white photography or normal color photography, visible fluorescence photography by injecting a visible fluorescent agent, and infrared fluorescence photography by injecting an infrared fluorescent agent. , when observing an image to be photographed in each of the above-mentioned photographing operations, the amount of observation illumination light from the observation light source is controlled by a normal observation light amount adjustment member having an adjustment area corresponding to normal photography, and a visible fluorescence time adjustment member having an adjustment area corresponding to visible fluorescence photography. A fundus camera characterized in that adjustment is performed via an observation light amount adjustment member and an infrared fluorescence observation light amount adjustment member having an adjustment area corresponding to infrared fluorescence photography.