JPH0515499A - Three dimensional fundus oculi camera - Google Patents

Abstract

PURPOSE:To provide a three dimensional fundus oculi camera both the image forming optical systems of which can be focused onto a papilla only with out optical system focused onto the papilla when the papilla is photographed. CONSTITUTION:The three dimensional fundus oculi camera is provided, in which a reflected beam coming is through an objective lens 31 from an fundus oculi is divided into two via a two hole throttle plate 41 having two holes 41a and 4ab, so that the fundus oculi is photographed in three dimensions by the use of the divided beams, where the two hole throttle plate is installed in such a way that the two holes are vertically line up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic fundus camera for splitting a reflected light flux of the fundus incident through an objective lens into two through a two-hole diaphragm and stereoscopically photographing the fundus by the split light flux.

[0002]

2. Description of the Related Art Conventionally, a stereoscopic fundus camera shown in FIGS. 5 and 6 has been known. 5 and 6, 2 is an objective lens facing the eye 1 to be inspected, 3 is an observation optical system for observing the fundus 1b of the eye to be inspected through the objective lens 2, 4
Is an illumination optical system that illuminates the fundus 1b of the eye to be examined.

The observation optical system 3 divides the reflected light flux of the fundus passing through the objective lens 2 into two first and second combined optical systems 5 and 6 for stereoscopically photographing the fundus. It has a light beam splitter 7 leading to the image optical systems 5 and 6, and a pair of eyepiece optical systems 8a and 8b for stereoscopically observing the fundus. 9 is a beam splitter 7
The circular aperture stop is installed at a position conjugate with the pupil 1a in front of the circular aperture stop. The circular aperture stop 9 is provided with two apertures 9a and 9b at left and right symmetrical positions in the horizontal direction.

The first and second imaging optical systems 5 and 6 are composed of relay lenses 10a and 10b and image erecting prisms 11a and 11b.

The illumination optical system 4 includes a perforated mirror 12 having a long hole P, a relay lens 13, a reflection mirror 14, and
It comprises a relay lens 15, a ring aperture plate 16 arranged at a conjugate position with the pupil 1a, a condenser lens 17, and an illumination light source 18.

When the illumination light source 18 emits light, the illumination light flux passes through the condenser lens 17, the ring aperture plate 16, the relay lens 15, the reflection mirror 14, the relay lens 13, the perforated mirror 12 and the objective lens 2 to the fundus 1b. Illuminate. Then, the reflected light flux of the fundus 1b passes through the objective lens 2, the long hole P of the perforated mirror 12 and the circular aperture stop 9 and reaches the light flux splitter 7, where the reflected light flux is divided into two.

One of the two split light beams is imaged on the image pickup surface 19 via the first image forming optical system 5. The other luminous flux is
An image is formed on the imaging surface 19 via the second imaging optical system 6 and the fundus 1b is stereoscopically photographed.

On the other hand, since a part of the light flux passing through the relay lenses 10a and 10b of the first and second image forming optical systems 5 and 6 is guided to the eyepiece optical systems 8a and 8b by the half mirrors Ha and Hb, FIG. As shown in FIG. 2, the fundus 1b is projected onto the projection images 9a ′, 9a ′, 9b
It can be observed in a stereoscopic view from the position 9b '.

[0009]

When stereoscopically photographing the fundus, one of the eyepiece optical systems 8a, 8b is looked into and the fundus 1b is focused and photographed. However, Figure 7
As shown in, the nipple N is horizontally displaced from the center position Eo of the fundus 1b, so that the aperture 9 of the circular aperture stop 9
The distance L1 from the projected image 9a 'of a to the nipple N and the distance L2 from the projected image 9b' of the opening 9b to the nipple N are different. Therefore, when the nipple N is focused by the left eyepiece optical system 8a, the right imaging optics 6 is out of focus, and conversely, when the right eyepiece optical system 8b is focused on the nipple N. , The left side imaging optical system 5 is out of focus. Therefore, the nipple N on one side of the binocular fundus image captured by focusing on only one side becomes blurred,
There is a problem that the stereoscopic fundus image of the nipple N is blurred.

Further, in order to bring both the left and right imaging optical systems 5 and 6 into the in-focus state, it is necessary to alternately repeat the focusing several times, which is very troublesome. It was

Therefore, the present invention has been made in view of the above-mentioned problems, and an object thereof is to take both imaging optical systems to the nipple by simply focusing with one eyepiece optical system when photographing the nipple. An object is to provide a stereoscopic fundus camera capable of focusing.

[0012]

In order to achieve the above object, the present invention divides a reflected light flux of the fundus incident through an objective lens into two through a two-hole diaphragm plate having two holes, A stereoscopic bottom camera for stereoscopically photographing a fundus with the two-divided light flux, characterized in that the two-hole diaphragm plate is installed so that the two holes are arranged in a vertical direction.

[0013]

In the present invention, since the two-hole diaphragm plate is installed with the two holes aligned in the vertical direction, the projected images of the two holes and the distance to the papilla are the same.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a stereoscopic fundus camera according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the arrangement of the optical system of the fundus camera. In FIGS. 1 and 2, 30
Is a photographing system for photographing the fundus Er of the eye E, and 70 is the fundus Er.
Is an illumination optical system for illuminating.

The photographing system 30 includes an objective lens 31 facing the eye E to be inspected, a splitting optical system 40 for splitting a reflected light flux from the fundus Er that has passed through the objective lens 31, and a split light flux to stereoscopically form the fundus Er. It is composed of a stereoscopic photographing optical system 50 for photographing.

The split optical system 40 is arranged at a conjugate position with the pupil Ea of the eye E to be inspected, and the two holes 41a and 41b are arranged in the vertical direction and are symmetrical with respect to the optical axis 30a. Two-hole aperture plate 41 and this two-hole aperture plate 4
The image erecting Porro prism 42 divides the reflected light flux from the fundus Er that has passed through 1 into two so as to be aligned in the vertical direction.

The stereoscopic photographing optical system 50 includes first and second image forming optical systems 51a and 51b arranged side by side in the vertical direction, and a fundus E.
The first and second imaging optical systems 51a and 51b are composed of an observation optical system 60 for observing r
2a and 52b, imaging lenses 53a and 53b for forming a fundus image on the film F, and image erecting prisms 54a and 54b.

The observing optical system 60 is composed of a quick return mirror 61 that jumps up to the position of a broken line at the time of photographing, a reflecting mirror 62, an eyepiece 63, and the like.

The illumination optical system 70 has a perforated mirror 71 having a long hole P, a relay lens 72, and a reflection mirror 73.
A relay lens 74, a ring aperture plate 75 at a position conjugate with the pupil Ea, a half mirror 76, a condenser lens 77, a photographing light source 78, a relay lens 79,
It is composed of an observation light source 80 and the like.

At the time of observation, the illumination light of the observation light source 80 is
It is guided to the eye E through the condenser lens 79, the ring aperture plate 75, the relay lens 74, the total reflection mirror 73, the relay lens 72, the perforated mirror 71, and the objective lens 31, and illuminates the fundus Er of the eye E. To do. The illumination light becomes ring-shaped illumination light when passing through the pupil Ea of the eye E to be examined.

The light beam reflected from the fundus Er is reflected by the objective lens 3
1 is guided to the perforated mirror 71, passes through the long hole P, and reaches the splitting optical system 40. Here, the reflected light flux that has passed through the long hole P is split by the two-hole diaphragm 41 and the image erecting Porro prism 42 into two light fluxes aligned in the vertical direction. One of the split light fluxes reaches the examiner's eye 64 via the focusing lens 52a, the imaging lens 53a, the image erecting prism 54a, the quick return mirror 61, the reflecting mirror 62 and the eyepiece 63, and the fundus Er is detected. Is observed with a single eye.

Then, while observing the fundus Er, the focusing lens 52a is operated to adjust the focus.

As shown in FIGS. 3 and 4, when the nipple N of the fundus Er is photographed, the focus is adjusted to the nipple N of the fundus Er.

In this case, the two-hole aperture plate 4 of the split optical system 40
Since the first holes 41a, 41b are arranged in the vertical direction, the projected images 41a ', 41b' of the holes 41a, 41b are formed in the pupil Ea at the vertical position symmetrical with respect to the optical axis 30a, Distances L3, L4 between projected images 41a ', 41b' and teat N
Is L3 = L4. Therefore, since the focusing lens 52b is interlocked with the focusing lens 52a, not only the first imaging optical system 51a but also the second focusing optical system 51a is adjusted by adjusting the focus of the focusing lens 52a.
The imaging optical system 51b is also focused on the nipple N.

In this way, by simply adjusting the focusing lens 52a to bring the nipple N into focus, both the first and second image forming optical systems 51a and 51b are in focus, so that both images are formed as in the conventional case. It is not necessary to alternately operate the optical systems 51a and 51b to focus, and the focusing operation becomes very simple.

When a shutter switch (not shown) is pressed, the photographing light source 78 emits light to illuminate the fundus Er in the same manner as described above and the quick return mirror 6
1 jumps up to the broken line position, the shutter (not shown) provided in front of the film F is opened, and the papilla N is stereoscopically photographed in a focused state. One of them is not blurred.

[0028]

According to the present invention, the two-hole diaphragm is provided with
Since the two holes are arranged vertically, the projected images of the two holes and the distance to the nipple are the same. Therefore, if one of the imaging optical systems is focused on the nipple, the other The image optical system can also focus on the papilla, and the focusing operation is very easy, and even if only one is focused, one of the two fundus images will be blurred as in the past. Absent.

[Brief description of drawings]

FIG. 1 is a plan view showing the arrangement of an optical system of an embodiment of a fundus camera according to the present invention,

FIG. 2 is a side view showing the arrangement of the optical system of the fundus camera,

FIG. 3 is a cross-sectional view showing a positional relationship between a papilla and a projected image of a hole when the eye to be inspected is cut in a vertical plane.

FIG. 4 is a cross-sectional view showing a positional relationship between a papilla and a projected image of a hole when a subject's eye is cross-sectioned in a horizontal plane.

FIG. 5 is a side view showing an arrangement of optical systems of a conventional fundus camera,

FIG. 6 is a plan view showing the arrangement of the optical system of the fundus camera,

FIG. 7 is a cross-sectional view showing a positional relationship between a papilla and a projected image of an opening when the eye to be inspected has a cross section in a horizontal plane.

[Explanation of symbols]

 31 Objective lens 41 Two-hole diaphragm plate 41a, 41b hole

Claims (1)

Claim: What is claimed is: 1. A fundus reflected by a fundus incident through an objective lens is split into two parts through a two-hole diaphragm plate having two holes, and the fundus is stereoscopically photographed by the split two parts. A stereoscopic fundus camera, wherein the two-hole diaphragm plate is installed so that the two holes are arranged in a vertical direction.