JPH01300925A - Fundus camera of photofluorography - Google Patents

Abstract

PURPOSE:To concentrate attention on imaging operation without paying attention to the incremental/decremental operation of the quantity of illumination light, by automatically increasing the quantity of illumination light for photofluorography in connection with the timer operation necessarily performed at the time of photofluorogrpahy. CONSTITUTION:A CPU 100 is connected to an exciter filter driving control part 110 for controlling an exciter filter driving apparatus 7, a barrier filter driving control part 112 for controlling a barrier filter driving apparatus 19 and an imaging light source power setting part 122 for setting the wattage of an imaging light source 6. Further, the CPU 100 is connected to a timer 118 which in turn starts counting by the closing of a timer switch 106 necessarily operated at the time of photofluorography and stops counting by the opening of said switch 106. The emitting quantity of light from the imaging light source 6 is increased to a predetermined value in connection with the counting start operation of the timer 118.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fundus camera capable of taking fluorescent photographs.

(Prior technology) When performing fluorescence photography with a fundus camera, unlike general photography, an exhaust filter is inserted into the illumination system, and a barrier filter is inserted into the photography system to set lighting conditions different from those for general photography. Since it is necessary to take pictures with the camera in the same position, there are switches for inserting and removing both filters. On the other hand, in the case of fluorescence imaging, it is necessary to inject a fluorescent contrast agent into the subject and record the elapsed time after the injection on the film surface along with the fluorescent blood vessel image, and to start and stop the timer. A timer switch is provided for this purpose.

When performing fluorescence photography with this type of fundus camera,
After inserting both filters into the optical path using the insertion/removal switches for both filters, a fluorescent agent is injected, a timer starts counting, and multiple fluorescent blood vessel images are taken as time passes.

(Problem to be Solved by the Invention) However, in this conventional fundus camera capable of fluorescence photography, the amount of illumination light for fluorescence photography must generally be greater than the amount of illumination light for general photography. However, in conventional fundus cameras, the amount of illumination light for fluorescence photography has to be increased manually. Therefore, there is a risk that the user forgets to increase the amount of illumination light during fluorescence photography and remains in use for general photography, or that the amount of illumination light remains increased when returning to general photography after fluorescence photography.

The present invention was developed in view of these shortcomings of conventional fundus cameras capable of fluorescence photography, and the present invention automatically increases the amount of illumination light for fluorescence photography in conjunction with a timer operation that is always performed during fluorescence photography. To provide a fundus camera capable of fluorescent photography without the risk of photographing due to erroneous acquisition, such as fluorescent photography being performed with a small amount of illumination light for general photography or general photography being taken with an increased amount of illumination light. The purpose is to

(Structure of the Invention) The fundus camera capable of fluorescent photography of the present invention that achieves the above-mentioned object includes a timer for measuring the elapsed time after injection of a fluorescent contrast agent, and a timer for starting and stopping the time measurement of the timer. a timer operation switch for controlling the illumination system, a photographing light amount control means for controlling the amount of light emitted by the photographing light source of the illumination system, and a photographing light amount setting section for setting the photographing light amount in the photographing light amount control means; The photographing light amount setting section is configured to set the amount of light emitted by the illumination system to a predetermined value substantially in conjunction with the timing start operation of the timer operation switch.

(Effects of the Invention) According to the present invention, the amount of illumination light for fluorescence photography is increased only when the operator operates the timer operation switch to start timing, and - the timer operation is always performed for fundus photography. Therefore, the amount of illumination light is always automatically increased by a predetermined amount during fluorescent photography, and the amount of illumination light is not increased during general photography, so the operator does not have to be distracted by increasing or decreasing the amount of illumination light. This has the advantage of allowing you to concentrate on photographing operations.

(Example) Hereinafter, a fundus camera according to an example of the present invention will be described based on the drawings. FIG. 1 shows the optical system of the fundus camera, which consists of an illumination system 1 and an imaging system 2 facing the eye E at right angles thereto.

The illumination system 1 includes a photographing light source 6, a condenser lens 8 positioned so that the photographing light source 6 is at the front focal point, a ring-shaped slit plate 10, an exciter filter 9, and a relay lens 11 arranged in sequence on the illumination optical axis 4. It will be done. Further, a semi-transparent mirror 12 is obliquely installed between the condenser lens 8 and the ring-shaped slit plate 10, and the incident optical axis 1 of the semi-transparent mirror 12 is
4, an observation light source 16 and a condenser lens 18 positioned so that the observation light source 16 is at the front focal point are arranged.

The photographing system 2 includes an objective lens 20, a perforated oblique mirror 22, a barrier filter 21 which can be freely inserted and removed onto the photographing optical axis 6 by a barrier filter drive device 19, and a photographing system, which are arranged on the photographing optical axis 6 in order from the non-ophthalmometry E side. a focusing lens 24 that is slidable on the optical axis 6;
It consists of an imaging lens 26 and a camera device 30. The perforated oblique mirror 22 is arranged at a position conjugate with the ring-shaped slit plate 10 with respect to the relay lens 11 . The objective lens 20 is positioned so that the perforated oblique mirror 22 and the pupil P of the non-optometry patient E are conjugate. An image of the fundus F of the eye to be examined is formed at an imaging position 40 by the objective lens 20 .

The camera device 30 includes a film 42, a swinging mirror 70 that can be freely inserted and removed on the photographing optical axis 6, and a focusing plate disposed on the reflection optical axis 72 of the swinging mirror 70 at a position conjugate with the film 42. 7
4, a reflecting mirror 76, and an eyepiece lens 78. The focusing plate 74 has a convex surface on one side and has a light focusing function. The swinging mirror 70 swings between an insertion position shown by a solid line and a removal position shown by a dotted line. The film 42 is arranged so as to be conjugate with the imaging position 40 with respect to the focusing lens 24 and the imaging lens 26 .

Next, a control system for controlling the fundus camera configured as described above will be explained based on the block diagram shown in FIG. 2. The CPU 100 that controls the entire 1liJ system includes an exciter filter insertion/removal switch 102 for inserting and removing the exciter filter 9 onto the illumination optical axis 4, and an exciter filter insertion/removal switch 102 for inserting and removing the barrier filter 21 onto the photographing optical axis 6. a barrier filter insertion/removal switch 104; a fluorescence photography illumination light intensity setting dial 120 for specifying the illumination light intensity during fluorescence photography;
A timer switch 106 output for starting and stopping the timer is connected.

The CPU 100 is for performing arithmetic processing for control, which will be described later, and includes an exciter filter drive control section 110 for controlling the exciter filter drive device 7 and a barrier filter drive device 19 for controlling the exciter filter drive control section 110 . It is connected to a barrier filter drive control section 112 and a photographing light source power setting section 122 for setting the output power of the photographing light source 6.

The CPU 100 is also connected to a timer 118, and starts counting by the timer when the timer switch 106 is turned on, and when the timer switch 106 is turned off.
The timer 118 is controlled to stop counting. The counting result of this timer 118 is stored in the display control unit 11
3, the information is displayed on the internal display 114 and the external display 116, respectively. The display result of the internal display 114 is imprinted on the film surface together with the fluorescent blood vessel image.

The CPU 100 further controls the exciter filter drive control section 110 and the barrier filter drive control section 112 to automatically remove the exciter filter 9 and the barrier filter 21 from the optical path in response to an off signal from the timer switch 106. Output a signal.

Next, the procedure for photographing the fundus will be explained based on the flowchart shown in FIG. First, in step 200, the amount of illumination light for fluorescence photography is specified. This is a low output in general photography, but in fluorescence photography, the fluorescence photography illumination light amount designation dial 120 is adjusted so that the output is higher than that in general photography, taking into account light absorption by each filter.

Subsequently, in step 202, it is determined whether the photographing mode is fluorescent photography or general photography. When fluorescence photography is determined in step 202, the exciter filter insertion/removal switch 102 and the barrier filter insertion/removal switch 104
Both fluorescent filters 9 and 19 are inserted into the optical path. Next, in step 204, a fluorescent agent is injected into the subject, and at the same time or immediately after this, in step 206, the timer switch 106 is operated to start counting the timer.

In step 208, the photographing light source 6 is set to a predetermined output so as to have the light amount specified in step 200 in conjunction with the timer starting operation. Subsequently, in step 210, a series of fluorescence photographs are performed. When the fluorescence photography is completed, the illumination power supply unit is returned to outputting the light amount for general photography.

In step 216, the fluorescent filter 9.19 is removed from the optical path and all operations are completed.

When the general photographing mode is determined in step 202, the photographing light source 6 outputs a normally set output for general photographing, and general photographing is performed in step 108.

[Brief explanation of the drawing]

FIG. 1 is an optical diagram of a fundus camera according to an embodiment of the present invention, FIG. 2 is a block diagram of a control system of the embodiment shown in FIG. 1, and FIG. 3 is a flowchart showing a luminescence photographing procedure. E... Eye to be examined 1... Illumination system 2... Imaging system 6... Imaging light source 7... Exciting filter drive unit 9.・・・
... Exciter filter 19 ... Barrier filter drive section 21 ... Barrier filter 100 ... CPU 102 ... Exciter filter insertion/removal switch 104 ... ...Barrier filter insertion/removal switch 1
06... Timer switch

Claims (1)

[Claims] In a fundus camera capable of photographing fluorescence, which has an illumination system for projecting illumination light onto the fundus of the subject's eye and a photographing system for photographing fluorescence in the fundus of the subject's eye, elapsed time after injection of a fluorescent contrast agent. a timer for timing, a timer operation switch for starting and stopping timing of the timer, a photographing light amount control means for controlling the amount of light emitted by the photographing light source of the illumination system, and the photographing light amount control means for controlling the amount of light emitted from the photographing light source of the illumination system. and a photographing light amount setting section for setting a photographing light amount, and the photographing light amount setting section sets the light emission amount of the illumination system to a predetermined value in substantially interlocking with the timing start operation of the timer operation switch. A fundus camera capable of photographing fluorescence, characterized in that it is configured as follows.