JPS6238135A - Eyeground camera for taking stereoscopic photograph - 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 an improvement in a fundus camera for stereoscopic photography that can obtain a stereoscopic photograph of a fundus image.

(Prior Art) Conventionally, in addition to normal imaging, fundus cameras have been used to actively analyze fundus lesions and their progress.
There is a desire to three-dimensionally photograph the curved surface and irregularities of the fundus, and in response to this demand, various fundus cameras for stereoscopic photography have been proposed that can obtain a three-dimensional photograph of the fundus image.

For example, an optical path splitting prism that divides the light beam reflected from the fundus into two is placed behind and near the perforated mirror for fundus illumination installed in the photographing system for photographing the formed image, and each light beam is In this system, two fundus images are simultaneously formed on a film by moving the fundus camera itself by a minute amount in parallel to the eye being examined, taking one fundus image at each position of movement, and creating one fundus image on a film. There is a method that forms a fundus image with a shifted image and obtains a stereoscopic photograph of the fundus image.

(Problem to be solved by the invention) However, the conventional fundus camera for stereoscopic photography, which divides the optical path into two to obtain a stereoscopic picture, is only for stereoscopic photography and cannot take pictures of normal fundus images. There is a problem. In addition, the fundus camera for stereoscopic photography, which obtains a stereoscopic photograph of the fundus image by moving the fundus camera itself by a small amount in parallel with the conventional eye to be examined, can also take normal fundus photographs in addition to stereoscopic photography. However, it has the disadvantage that the fundus camera itself must be moved relative to the subject's eye and a fundus image must be taken at each moving position, and two fundus images cannot be obtained at the same time. ,
There is a problem that the shooting operation is troublesome.

(Objective of the Invention) Therefore, an object of the present invention is to provide a stereoscopic camera that is capable of not only stereoscopic imaging but also normal imaging, and that allows two fundus images to be captured at the same time with good operability during stereoscopic imaging. An object of the present invention is to provide a fundus camera for photography.

(Means for Solving the Problems) A fundus camera for stereoscopic photography of the present invention achieves the above object.

an illumination system that illuminates the fundus of the eye to be examined; an imaging optical system having a first optical path that guides the fundus image of the eye to be examined to a first photographing means; an optical path splitting reflection member forming a second optical path leading to a second photographing means; provided in either the first optical path or the second optical path at a position substantially conjugate with the pupil of the eye to be examined; a light flux splitting member that divides into two the light flux from the fundus image formed by the imaging optical system; and a relay lens that forms two fundus images on one of the first and second photographing means based on the two light fluxes. It is in a place where it has

(Function) According to the present invention, normal fundus photography and stereoscopic photography can be performed by selectively switching the optical path depending on the photography, so that the desired photography can be carried out with a simple photography operation. It can be performed.

(Example) Hereinafter, an example of the fundus camera according to the present invention will be described with reference to the drawings.

In FIG. 1, 1 is an illumination system, 2 is an imaging optical system, 3 is a finder system, 4 is an eye to be examined, and 5 is the fundus of the eye 4 to be examined. The illumination system 1 includes an am light source 6, a first condenser lens 7, a photographing light source 8, a second condenser lens 9, a ring-shaped slit aperture 10, a total reflection mirror 11,
It is generally composed of a relay lens 12, and Q□ is the optical axis of the illumination system 1. The imaging optical system 2 includes an objective lens 13 and a perforated mirror 14.

It has a focusing lens 15 and an imaging lens 16, and Q2 is the optical axis of the imaging optical system 2. A switching mirror 17, a quick return mirror 18, and a film 19 are provided behind the imaging lens 16 of the imaging optical system 2. Here, the film 19 constitutes a part of a first photographing means for photographing a normal fundus image. The finder system 3 is composed of a quick return mirror 18, a field lens 20, a prism 21, and an eyepiece lens 22. The quick return mirror 18 is inserted into the optical path of the imaging optical system 2 during AM, and is inserted out of the optical path during shooting. It will be evacuated to

The observation light source 6 is lit for fit detection, the photographing light source 8 is lit for photographing, and the first condenser lens 7 is lit for I+! The second condenser lens 9 has the function of condensing the bright light at the time of detection.
has a function of condensing illumination light during photographing. At the time of w1 inspection,
Each illumination light during photographing passes through a ring-shaped slit aperture diaphragm 10 arranged at a position substantially conjugate with the pupil of the eye to be examined, and is reflected as ring-shaped slit light by a total reflection mirror 11, followed by a relay lens 12 and a perforated mirror 14. , are projected onto the fundus 5 of the eye 4 to be examined via the objective lens 13.

The switching mirror 17 is inserted into the first optical path formed by the imaging optical system 2 when taking a stereoscopic photograph, and is withdrawn from the first optical path when taking a normal photograph. This switching mirror 17 functions as an optical path splitting and reflecting member that forms a second optical path that guides the fundus image to the second photographing means 23 . The second photographing means 23 includes a lens 24, an aperture plate 25, a prism 26 for deflecting each of the two light beams divided by the aperture plate 25 inwardly with respect to the optical axis, and a fundus image from each of the two light beams. Relay lens 27.2 for forming
8 and a film 29, and is detachable from a lens barrel (not shown) that constitutes the imaging optical system 2.

Here, the second photographing means 23 is for performing stereoscopic photography, and the aperture plate 25 is provided on the second optical path at a position substantially conjugate with the pupil of the eye to be examined.

As shown in FIG. 2, this aperture plate 25 has small holes 30.
31 is formed. This aperture plate 25 functions as a light beam splitting member that divides the fundus image formed by the imaging optical system 2 into two.

3 and 4 show second and third embodiments of the fundus camera for stereoscopic photography according to the present invention, and the prism 26 in FIG. The prism 26 in FIG.
The light beams are reflected in opposite directions to separate films 32.
33.

(Effects of the Invention) As explained above, the fundus camera according to the present invention selectively switches the imaging optical path depending on the imaging, so it is possible to perform not only stereoscopic imaging but also normal imaging.
In addition, when taking stereoscopic shots, it is possible to improve operability and simultaneously use two
This has the effect of allowing two fundus images to be taken.

[Brief explanation of drawings]

FIG. 1 is an optical system path diagram showing the main part configuration of a fundus camera for stereoscopic photography according to the present invention, FIG. 2 is an enlarged plan view of the aperture plate shown in FIG. 1, and FIGS. 3 and 4 are FIG. 3 is a diagram illustrating a main optical system of second and third embodiments of a fundus camera for stereoscopic photography according to the present invention. 1... Illumination system 2... Imaging system 4... Eye to be examined 5... Fundus 10... Ring-shaped slit aperture diaphragm 15... Focusing lens 17... Switching mirror 19... Film 23... No. 2 Photographing means 25... Aperture plate 27... Relay lens Fig. 3 Fig. 4

Claims (1)

[Claims] (1) An illumination system that illuminates the fundus of the eye to be examined; an imaging optical system having a first optical path that guides the fundus image of the eye to be examined to a first photographing means; an optical path splitting reflection member forming a second optical path that guides the fundus image to a second photographing means; and an optical path splitting and reflecting member provided in either the first optical path or the second optical path at a position substantially conjugate with the pupil of the eye to be examined. a light flux splitting member that divides into two a light flux from a fundus image formed by the imaging optical system; and a light flux splitting member that forms two fundus images on one of the first and second photographing means based on the two light fluxes. A fundus camera for stereoscopic photography characterized by comprising a relay lens.