JPS63260531A - Eyeground camera - Google Patents

Abstract

(57) [Summary] 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 fundus camera, and particularly to a fundus camera having a focusing index projection system.

(Prior Art) As for fundus cameras, there are known fundus cameras that are provided with a focusing index projection system to facilitate focusing on the fundus. In this type of fundus camera, the focus state of the focusing index image projected onto the fundus is determined by a
The system then adjusts the focus on the fundus based on this focus state.

In addition to general color imaging, fundus cameras are configured to take fluorescent fundus images by inserting an exciter filter into the illumination system and a barrier filter into the observation imaging system. In this case, a fluorescent agent is injected into the subject, and a number of images are taken of changes in the fundus image after the fluorescent agent is injected.

By the way, when performing this fluorescence photography, the fluorescence blood vessel image can be seen faintly in the initial stage of fluorescent agent injection, and like a conventional fundus camera, the same index image for focusing as in general color photography is used. At this brightness, the focus index image becomes a hindrance, making it impossible to observe minute blood vessel images.

(Purpose of the Invention) The present invention aims to solve the problems of the conventional fundus camera.It is an object of the present invention to solve the problems of the conventional fundus camera. The present invention also aims to provide a fundus camera capable of projecting a focusing index that does not interfere with observation of minute blood vessel images during fluorescence photography.

(Structure of the Invention) In order to achieve the above object, the present invention provides an illumination system for illuminating the fundus of the eye to be examined, a WA imaging system for observing and photographing the fundus of the eye to be examined, and a focusing system on the fundus of the eye to be examined. a fundus camera i, which has an index projection system for projecting a target index image, and is configured to focus the observation and photographing system by observing the in-focus state of the focusing index image; The fundus camera is configured to reduce the brightness of the focus index image when observing and photographing a fluorescent image of the fundus of the eye to be examined.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 and FIG. 2 are diagrams showing one embodiment of the present invention.

First, to explain the configuration, Fig. 1 shows the optical system of the fundus camera.
It consists of a wA imaging system 2 facing the camera, and an index projection system 3 for projecting a focusing index.

This illumination system 1 includes a photographing light source 6. Condenser lens 8. A ring slit plate 10°, a relay lens 11, etc. are arranged. Further, a semi-transparent mirror 12 is obliquely installed between the condenser lens 8 and the ring slit plate IO, and an observation light source 16 is placed on the incident optical axis of the semi-transparent mirror 12.
A condenser lens 18 is arranged. Furthermore, an exciter filter 9 for fluorescence photography is removably arranged between the relay lens 11 and the ring slit plate 10. This exciter filter 9 is inserted into the optical path of the illumination system 1 only during fluorescence photography by an exciter filter drive device 7.

In the above configuration, this illumination system 1 transmits illumination light emitted from the observation light source 16 or the photographing light source 6 to the ring slit plate 10.
After transmitting the light, the light is reflected by the perforated oblique mirror 22 and guided to the eye E through the objective lens 20 to illuminate the fundus F.

On the other hand, the observation and photographing system 2 is for observing and photographing the image of the fundus F illuminated by the illumination system 1, and includes an objective lens 20 and an oblique mirror 2 with a hole along the observation and photographing optical axis 19.
29 Focusing lens 24. It has an imaging lens 26 and forms a fundus image on a film 28. At aa time, reversing mirror 3
0 is +! as shown by the solid line in the figure. ! The fundus image formed on the field lens 32, which is obliquely placed on the imaging optical axis 19, is viewed by the examiner using the reflecting mirror 34 and the eyepiece lens 36.
I2 is detected. Furthermore, a barrier filter 60 is removably disposed between the focusing lens 24 and a small mirror 52.52'' to be described later.
By the barrier filter drive device 66, a
It is inserted into the optical path of the imaging system 2.

The index projection system 3 also has a focusing index image 6 on the fundus F.
A light source 40.2 is arranged on the target projection optical axis 38. It has an index mask plate 462 having a slit-shaped opening to which a condenser lens 42 and a deflection prism 44 are bonded, a focusing lens 482, and a reflecting mirror 50. The light beam transmitted through the index mask plate 46 is directed to the deflection prism 4
4, the beam is separated into two beams with different directions, and then reflected by small mirrors 52 and 52' placed on both sides of the photographing optical axis 19 (arrayed in the direction perpendicular to the plane of the paper in the figure) and reflected by the objective. The six focusing lenses 48 that form the focusing index image 62 on the fundus F through the lens 20 move along the index projection optical axis 38 in conjunction with the movement of the focusing lens 24 of the a festival photographing system 2.
It is possible to move along.

Furthermore, a filter portion 54 is provided between the index mask plate 46 and the condenser lens 42 for changing the color tone and brightness of the index projection light. This filter part 5
4 is provided with a green filter 56 and a neutral density filter 58, which can be selectively inserted into the optical path. When Q, green filter 5
6 is inserted into the optical path, and in the case of fluorescence photography, a neutral density filter 58 is inserted into the optical path.

This selection is configured to be automatically performed by driving the exciter filter 9 and the rear filter 60.

That is, the filter part 54 is driven by a filter part drive device 61 , and this filter part drive device 61 is electrically connected to the control section 64 . This control section 64 is also connected to a barrier filter drive device 66 and an exciter filter drive section 7, and drives each filter based on a signal from an operation switch 68. Then, when the fluorescence photography mode is set using the operation switch 68, the control unit 64
An exciter filter 9 is provided in the optical path of the illumination system 1, and
The barrier filter 60 is automatically inserted into the optical path of the observation photographing system 2, and the attenuating filter 58 of the filter portion 54 is inserted into the optical path of the index projection system 3. Further, when the color photographing mode is set by the operation switch 68, the exciter filter 9 and the barrier filter 60 are removed from each optical path by the control unit 64, and the green filter 56 of the filter part 54 is set to the index projection system. It is configured to be inserted into the optical path of No. 3.

With this configuration, during color photography, the green filter 56 is inserted into the optical path of the index projection system 3, so that a green focusing index image 62 is projected onto the fundus F and overlaps with the fundus image. As shown in Figure 2!
be noticed. In this case, the fundus image has a red tone;
The green focusing index image 62 is clearly identified.

In addition, in the case of fluorescence photography, a neutral density filter 58 is inserted in the optical path of the index projection system 3 instead of the green filter 56, and white light is illuminated on the fundus F, depending on the brightness during color photography. A dark focusing index image 62 is projected. During this fluorescent photography.

The fundus blood vessel image has a green tone, and the white light focusing index image 62 can be clearly identified, and the brightness is lower than when photographing in color, so it does not pose an obstacle to viewing the tingling and dark blood vessel image. .

As a result, the connection lens 3
6, as shown in FIG. 2, the fundus images are superimposed so that a focusing index image 62 can be clearly seen, and the focusing lens 24.48 When this adjustment is completed, the photographing light source 6 is turned on, and the reflecting mirror 30 is moved out of the optical path and removed to photograph the fundus image on the film 28. It is something to do.

(Effects of the Invention) According to the present invention described above, the brightness of the focusing index image is reduced when observing a fluorescent image of the fundus of the subject's eye and performing FJ photography, so that the focus is not adjusted during general color photography. The brightness of the focusing target image is reduced when the setting is set to a brightness sufficient to clearly distinguish the focusing target image, and when the fundus blood vessel image is dark during fluorescence imaging, especially in the early stages of fluorescent agent injection. The index image does not get in the way, and minute fluorescent blood vessel images can be easily visualized.

[Brief explanation of drawings]

Each figure shows an embodiment of the fundus camera of the present invention, with FIG. 1 showing an optical system of the fundus camera, and FIG. 2 showing a fundus image. 1...Illumination system 2...Observation photography system 3...
・Indicator projection system

Claims (2)

[Claims] (1) An illumination system for illuminating the fundus of the subject's eye, an observation and photographing system for observing and photographing the fundus of the subject's eye, and an index projection system for projecting a focusing index image onto the fundus of the subject's eye. and a fundus camera configured to focus the observation and photographing system by observing the in-focus state of the focus index image, when observing and photographing a fluorescent image of the fundus of the subject eye, the focus index image A fundus camera configured to reduce the brightness of the fundus camera. (2) An exciter filter is removably placed in the illumination optical path and a barrier filter is placed in the observation and photographing system optical path, and a focus index image is generated in conjunction with the insertion of at least one of the filters into the optical path. The fundus camera according to claim 1, wherein the fundus camera is configured to reduce the brightness of the fundus camera.