JP2736779B2 - Fluorescence imaging device for fundus camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fluorescence photographing device for a fundus camera.

(Prior art) When performing fluorescence imaging with a fundus camera, unlike ordinary imaging, an exciter filter is inserted into the illumination system, and a barrier filter is inserted into the imaging system to set illumination conditions different from those for general imaging. It is necessary to do so, and a switch for inserting and removing both filters is provided. on the other hand,
In the case of fluorescence imaging, it is necessary to inject a fluorescent molding agent into the subject and to copy the elapsed time after the injection together with the fluorescent blood vessel image on the film surface, and to operate a timer for starting and stopping the timer. A switch is provided.

When performing fluorescence imaging with this type of fundus camera, after inserting both filters into the optical path by inserting and removing the two filters, a fluorescent agent is injected and a timer is started. To shoot.

(Problems to be Solved by the Invention) However, in this conventional fundus camera, one or both of the exciter filter and the barrier filter remain inserted in the optical path even if the timer is stopped and the fluorescence imaging is terminated. There is a risk of making an error that the photographer will shift to non-fluorescent general photographing without leaving the optical path from the optical path.

The present invention has been made in view of these drawbacks of the conventional fluorescence photographing apparatus of the fundus camera, and when the timer is stopped after the completion of the fluorescence photographing, the filter for the fluorescence photographing is automatically separated from the optical path, thereby causing an erroneous operation. It is an object of the present invention to provide a fluorescence photographing apparatus for a fundus camera which does not have a possibility of photographing by a camera.

(Constitution of the Invention) A fluorescence photographing apparatus for a fundus camera according to the present invention that achieves the above-mentioned object has an illumination system for projecting illumination light onto the fundus of the eye to be examined and a photographing system for photographing the fundus of the eye to be examined. In a fundus camera, a first operation switch for inserting and removing an exciter filter in an illumination system optical path, a second operation switch for inserting and removing a barrier filter in an imaging system optical path, and an elapsed time after injection of a fluorescent molding agent And a timer operation switch for starting and stopping the timer, so that the two filters can be separated out of the optical path in conjunction with the stop of the timer by the timer operation switch. Be composed.

(Effects of the Invention) According to the present invention, at the time of fluorescence imaging, both filters of the exciter filter barrier filter can be easily inserted into the optical path by the insertion / removal switch to perform imaging, and the fluorescence imaging is completed. When the timer is stopped, the two filters are automatically removed out of the optical path in conjunction with the stop of the timer, and the camera mistakenly shifts to the next general shooting with both filters inserted. Has the advantage that it can be effectively prevented from being performed.

Hereinafter, a fundus camera according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows an optical system of a fundus camera, which comprises an illumination system 1 and an imaging system 2 orthogonal to the illumination system 1 and facing the eye E to be examined.

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, and a relay lens on the illumination optical axis 4.
11 is arranged. Further, a semi-transmissive mirror 12 is inclined between the condenser lens 8 and the ring-shaped slit plate 10 so that the observation light source 16 and the observation light source 16 are on the front focal point on the incident optical axis 14 of the semi-transparent mirror 12. The positioned condenser lens 8 is arranged.

The photographing system 2 includes a barrier filter which can be inserted and removed on the photographing optical axis 6 by the objective lens 20, the perforated oblique mirror 22, and the barrier filter driving device 19 sequentially from the eye E on the photographing optical axis 6.
21, a focusing lens 24 slidable on the photographing optical axis 6, an imaging lens 26, and a camera device 30. The perforated mirror 22 is disposed 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 mirror 22 and the pupil P of the eye E are conjugate. An image of the fundus F of the subject's eye is formed on the image forming position 40 by the objective lens 20.

The camera device 30 includes a film 42, an oscillating mirror 70 that can be inserted and removed on the photographing optical axis 6, and a focusing screen disposed on a reflection optical axis 72 of the oscillating mirror 70 and at a position conjugate with the film 42. 74 and a reflector
76 and an eyepiece 78. The focusing screen 74 has a convex surface on one side, and has a light collecting function. The swing mirror 70 swings between an insertion position indicated by a solid line and a detached position indicated by a dotted line. The film 42 is disposed so as to be conjugate with the image forming position 40 with respect to the focusing lens 24 and the image forming lens 26.

Next, a control system for controlling the fundus camera having the above configuration,
Description will be made based on the block diagram shown in FIG. The CPU 100 that controls the entire control system includes an exciter filter insertion / removal switch 102 for inserting and removing the exciter filter 9 on the illumination optical axis 4, and a barrier filter for inserting and removing the barrier filter 21 on the photographing optical axis 6. Insertion / extraction switch
104 and a timer switch 106 for starting and stopping the timer are connected.

The CPU 100 is for performing arithmetic processing for control to be described later, and is an exciter filter drive control unit 110 for controlling the exciter filter drive device 7.
And a barrier filter driving control unit 112 for controlling the barrier filter driving device 19.

The CPU 100 is also connected to a timer 118, and starts counting the timer when the timer switch 106 is turned on, and starts the timer 118 when the timer switch 106 is turned off.
Is controlled to stop counting. This timer 118
Are displayed on the internal display 114 and the external display 116 by the display control unit 113, respectively. This internal display 1
The display result of 14 is printed on the film surface together with the fluorescent blood vessel image. The CPU 100 further outputs a control signal to the exciter filter drive control unit 110 and the barrier filter drive control unit 112 so that the exciter filter 9 and the barrier filter 21 are automatically separated from the optical path by the OFF signal of the timer switch 106. .

Next, the procedure of the fluorescence imaging will be described with reference to the flowchart shown in FIG. When performing fluorescence imaging, in step 201, both fluorescent filters are inserted into the optical path by the exciter filter insertion / removal switch 102 and the barrier filter insertion / removal switch 104. Then step 20
In step 2, the subject is injected with the fluorescent agent, and at the same time, the timer switch 106 is operated in step 203 to start counting the timer. In step 203, a series of fluorescence imaging is performed. When the fluorescent imaging is completed, the timer is stopped by operating the timer switch 106 in step 205. In conjunction with this, the two fluorescent filters inserted into the optical path are removed in step 205.

[Brief description of the drawings]

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 light emission photographing procedure. E: Eye to be inspected 1 ... Illumination system 2 ... Imaging system 6 ... Imaging light source 7 ... Exciter filter drive unit 9 ... Exciter filter 19 ... Barrier filter drive unit 21 ... Barrier filter 100 ... CPU 102 ... … Exciter filter insertion / removal switch 104 …… Barrier filter insertion / removal switch 106 …… Timer switch

Claims (1)

(57) [Claims] A fundus camera having an illumination system for projecting illumination light onto the fundus of the eye to be inspected and a photographing system for photographing the fundus of the eye to be inspected, for inserting and removing an exciter filter into an optical path of the illumination system. A first operation switch, a second operation switch for inserting and removing the barrier filter in the optical path of the imaging system, a timer for measuring the elapsed time after injection of the fluorescent molding agent, and for starting and stopping the timer A fluorescence operation device for a fundus camera, characterized in that the two filters are detachable out of the optical path in conjunction with the stop of the timer by the timer operation switch.