JPS63105738A - Timer imaging device for fluorescent eyeground photographing - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a timer imprinting device for fluorescent fundus photography.

(Prior Art) Fluorescence photography in a fundus camera involves injecting a fluorescent agent into the veins of a subject and photographing changes in the fluorescence image of the fundus after the injection.

Therefore, in conventional fundus cameras, a timer is started at the same time as the fluorescent agent is injected, and the elapsed time from the injection is recorded on the photographic film along with the fundus image.

However, in this conventional fundus camera, the elapsed time is digitally displayed in units of 1/10 seconds, so the smallest unit of time display numbers change while the shutter is open, and these numbers overlap and appear on the film surface. There was a problem that the elapsed time imprinted on the image may not be clearly readable.

(Object of the Invention) The present invention has been made in view of the problems of the prior art, and is a timer imprinting device that can clearly imprint the elapsed time after injection of a fluorescent agent during fluorescence photography. The purpose is to provide

(Structure of the Invention) Therefore, the present invention is characterized in that the digital display indicating the elapsed time is stopped in conjunction with the shutter release operation, and the elapsed time is clearly reflected.

(Effects of the Invention) According to the present invention, the timer display stops while the photographing shutter is open, and the advantage is that the elapsed time can always be clearly imprinted on the photographic film surface.

(Example) Hereinafter, a fluorescent 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 that faces 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 that can be freely inserted and removed onto the photographing optical axis 5 by a barrier filter drive device 19, and a photographing system. a focusing lens 24 that is slidable on the optical axis 5;
Imaging lens 26, flip-up reflector 28, timer device 29
, a first camera device 31, and a second camera device 32. The perforated oblique mirror 22 is arranged at a position conjugate with the circular slit plate 10 with respect to the relay lens 11. Objective lens 2
0 is positioned so that the perforated oblique mirror 22 and the pupil P of the eye E to be examined 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 .

When photographing with the first camera device 31, the flip-up reflector 28 is held at an insertion position obliquely disposed on the photographing optical axis 5 shown by a solid line, and when photographing with the second camera device 32, the photographing light shown by a dotted line is held. It is held at the detached position where it is detached from the shaft 5.

The timer device 29 is configured to form an image of the display device 50 on the first film 44 using the relay lenses 52, 54, 56, the reflecting mirror 58, and the flip-up reflecting mirror 28 at the insertion position. The timer device 29 also controls the relay lenses 52, 54 . when the flip reflector 28 is in the disengaged position.
60, the second film 42 by the reflecting mirror 58, 62, 64
configured to be imaged on.

The second camera device 32 includes a swinging mirror 70 that can be freely inserted and removed on the photographing optical axis 5, and a focus plate disposed on the reflection optical axis 72 of the swinging mirror 70 and at a position conjugate with the second film 42. 74, 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. Swinging mirror 70
oscillates between an insertion position shown by a solid line and a removal position shown by a dotted line. The first film 44 and the second film 42 are arranged so as to be conjugate with the imaging position 40 with respect to the focusing lens 24 and the imaging lens 26.

In the above configuration, during observation, the flip-up reflecting mirror 28 is at the detached position, the observation light source 16 emits light, the barrier filter 21 is detached from the photographing optical axis 5, and the swinging mirror 70 is at the insertion position. At this time, the display on the display device 50 can also be observed together with the fundus image.

On the other hand, when a fluorescent agent is injected into the subject and fluorescent photography is performed, the exciter filter 9 and the barrier filter 21 are inserted, and the first camera device 31 or the second camera neck 32 is selected. , accordingly the flip-up reflector 28
is held in the inserted or removed position. And a shutter (not shown) of either camera device 31 or 32
is released at predetermined time intervals, and the film 42 or 44 is released at predetermined time intervals.
In addition to the time display on the display device 50, a fluorescent image of the fundus of the eye is exposed.

Next, the timer device 29 will be explained. As shown in FIG. 2, the timer device 29 starts operating when the examiner turns on the timer switch 100 immediately after injecting the fluorescent agent into the subject. The ON signal of the timer switch 100 causes the CPU 102 to cause the timer 104 to start counting. On the other hand, the latest count of the timer 104 is always stored in the storage unit 106, and the display control unit 13 stores the count stored in the storage unit 106. An internal display 114 and an external display 1 for the examiner correspond to the values.
16 to digitally display the elapsed time. When the examiner releases the shutter 108, the light source generation control section 110 causes the strobe 112 to emit light, and at the same time, the CPU outputs a signal to the display control section 113 to stop the display. The time displayed on the cabinet internal display 114 and external display 116 is stopped at the time of light emission. When the release of the shutter 108 is completed, the stoppage of the display time is canceled and the internal display 1
14 and an external display 116 display the elapsed time in accordance with the count value stored in the storage unit 106.

As shown in FIG.
Place the timer switch 100 labeled rTIMEJ on the side of 02, and press 1; l: r above the numeric keypad 202.
cOUNTJ rTIMEJ' rDATAJ ``^S
An external display 116 labeled A/ISOJ is disposed, and a mode switch 118 for selecting a display mode of the external display 116 labeled rMODE J is disposed on the side of the external display 116. The timer switch 100 is
This is used to start counting the timer 104 as described above, and is pressed by the actor immediately after the fluorescent side is injected. The numeric keypad 202 is used to enter film sensitivity and shooting date manually. The internal display 114 and the external display 116 controlled by the display control unit 112 display the counts stored in the storage unit 106 as described above.
It is also possible to display the film speed and shooting date manually determined by .

[Brief explanation of the drawing]

Fig. 1 is an optical path diagram of a fundus camera equipped with a timer imprinting device for fluorescent fundus photography according to an embodiment of the present invention, Fig. 2 is a block diagram of the timer device, and Fig. 3 is a plan view of the operation panel. be. 1... Illumination system 2... Photography system 6... Photography light source 16... Observation light source 20... Objective lens 21... Barrier filter 29... Timer device 50... Display device 100. ...Timer switch 102...CPU 104...Timer 108...Shutter 110...Light source generation control section Fig. 2 Fig. 3

Claims (1)

[Scope of Claims] A timer imprinting device comprising a clock means, a display section for digitally displaying the elapsed time based on a signal from the clock means, and means for imprinting the display section onto the photographic film surface, 1. A timer imprinting device for fluorescent fundus photography, characterized in that a control section is provided for stopping the display on the display section for a predetermined period of time in conjunction with the photographing shutter release.