JPH0644903B2 - Fundus camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fundus camera.

(Prior art) When performing fluorescence photography with a fundus camera, insert an exciter filter into the illumination system, insert a barrier filter into the photography system, and set the illumination conditions different from those for general photography. There is a need. On the other hand, when both filters are inserted in the optical path, it is difficult to observe the fundus image due to insufficient light quantity.If the fundus image is adjusted before or during continuous shooting, remove the barrier filter. Adjustments need to be made. As described above, in fluorescence photography, complicated operations such as insertion of both filters at the time of photography, removal of the barrier filter at the time of observation, and setting of the fluorescence photography mode are required.

Therefore, in the conventional fundus camera, the exciter filter and the barrier filter are electrically inserted and removed to facilitate this photographing operation, and both filters are inserted into the optical path in conjunction with the shutter release operation. A device has been proposed.

However, even in the fundus camera configured as described above, not only the fluorescence photographing mode setting switch is required separately from the insertion / removal switches of both filters, but also a switch for removing the barrier filter after photographing is necessary. However, there is a drawback in that the operation of these switches is complicated, and there is a high possibility that shooting may fail or the shooting timing may be missed due to an inappropriate exposure amount.

(Object of the Invention) The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide a fundus camera capable of fluorescent photography without failure by simple switch operation.

(Structure of the Invention) The present invention, which achieves the above-mentioned object, is a fundus camera having an illumination system for projecting illumination light onto a fundus of a subject's eye, and an imaging system for photographing the fundus of the subject's eye. A first operation switch for inserting and removing the exciter filter, a second operation switch for inserting and removing the barrier filter in the optical path of the photographing system, and whether or not to remove at least one of the two filters after photographing And a filter drive control unit capable of selecting the.

(Effects of the Invention) According to the present invention, it is possible to automatically set the fluorescence photographing mode simply by inserting at least one filter into the optical path by inserting / removing each of the exciter filter and the barrier filter. In this case, by simply turning on the shutter release, both filters are automatically inserted in the optical path, and proper photography can be performed according to the set fluorescence photography mode. Further, if the advance filter detachment switch is turned on, the barrier filter is detached every time one photographing is completed, and the fundus image can be clearly observed between photographing and the focused state can be confirmed. Has the effect.

(Embodiment) A fundus camera according to an embodiment of the present invention will be described below 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 which is orthogonal to the illumination system 1 and faces the eye E to be inspected.

The illumination system 1 is configured by sequentially arranging a photographing optical axis 6 on an illumination optical axis 4, a condenser lens 8 positioned so that the photographing optical axis 6 is at a front focal point, a ring slit plate 10, and a relay lens 11. . Further, a semitransparent mirror 12 is obliquely provided between the condenser lens 8 and the ring-shaped slit plate 10, and an observation light source 16 is provided on an incident optical axis 14 of the semitransparent mirror 12.
The condenser lens 8 is arranged so that the observation light source 16 is at the front focal point.

The photographing system 2 includes an objective lens 20, a perforated obliquely mounted mirror 22, a barrier filter driving device 19 in order from the eye E side to be photographed on the photographing optical axis 6, and a barrier filter 21 which can be freely inserted and removed on the photographing optical axis 6 and photographing. A focusing lens 24 that can slide on the optical axis 6,
It includes 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 eye E to be examined are conjugated. The image of the fundus F of the eye to be examined is formed at 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 into and removed from the photographic optical axis 6, and a focusing plate disposed on the reflective optical axis 72 of the oscillating mirror 70 and at a position conjugate with the film 42. 7
4, a reflecting mirror 76, and an eyepiece lens 78. The focusing screen 74 has a convex surface on one side and has a light collecting function. The oscillating mirror 70 oscillates between an insertion position indicated by a solid line and a detached position indicated 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 having the above-described configuration will be described 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. An insertion / removal switch 104, a filter removal switch 106 for selecting whether or not to remove at least one of the filters 9 and 21 from the optical axes 4 and 6 after photographing,
The shutter release button 108 is connected.

The CPU 100 is for performing arithmetic processing for control described below, and includes an exciter filter drive control unit 110 for controlling the exciter filter driving device 7 and a barrier filter for controlling the barrier filter driving device 19. It is connected to the drive control unit 112 and a mode control unit 114 that selects a general photographing mode or a fluorescent photographing mode. The mode control unit 114 controls the light emission of the observation light source control unit 116 that controls the emission of the tungsten lamp that is the observation light source 16 and the xenon lamp that is the photographing optical axis 6 through the photographing light source control unit 120, and also releases the shutter. It is connected to the photographing control unit 118 that controls.

Next, the operation of the control system that is arithmetically processed by the CPU 100 will be described with reference to the flow chart shown in FIG. In step 201, it is determined whether or not the exciter filter insertion / removal filter 102 or the barrier filter insertion / removal switch 104 is pressed. It is set by switching to the fluorescence mode in advance so as to increase. Further, the amount of illumination light for observation is also increased at the same time. If it is determined in step 201 that the switch has not been pressed, the process proceeds to step 204 to set a general photographing mode in which the illumination light amount for observation and photographing is not switched.

When the setting of the fluorescence mode in step 202 is completed, the process proceeds to step 206, and it is determined whether or not the shutter release button 108 has been pressed. If the shutter release button 108 has been pressed, the process proceeds to step 208, and if not, the process waits until it is pressed. Step two
In 08, it is determined whether or not the exciter filter 9 and the barrier filter 21 are inserted, and if they are inserted, the process proceeds to step 210, the shutter is released, and the xenon lamp is set to the fluorescence mode. Use to light up and shoot. Step two
If it is determined in 08 that one of the filters 9 or 21 is not inserted, the process proceeds to step 212 to drive the exciter filter driving device 7 and the barrier filter driving device 19 to insert the filters 9 and 21 and step 210. Go to.

When the photographing is completed, the routine proceeds to step 214, where it is judged if the filter removal switch 106 is pushed. When it is determined that the filter release switch 106 has been pressed,
When the barrier filter driving device 19 is driven and the barrier filter 21 is detached, the fundus observation focusing is enabled, and if not pressed, the control ends as it is.

[Brief description of drawings]

FIG. 1 is an optical diagram of a fundus camera of 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 flow chart showing the operation of the control system. E ... Eye to be inspected 1 ... Illumination system 2 ... Imaging system 6 ... Imaging optical axis 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 …… Filter insertion / removal switch 108 …… Shutter release button

Claims (1)

[Claims] 1. A fundus camera having 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, wherein an exciter filter for inserting and removing an exciter filter in 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 photographing system, and a filter drive control capable of selecting whether or not to separate at least one of the filters after photographing. A fundus camera having a portion.