JPS5886139A - Eye bottom 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 The present invention provides a fundus camera equipped with an optical system for observing the anterior segment of the eye, an optical system for observing the fundus, and a reflector for switching these optical systems between a state of use and a state of non-use. In particular, it relates to lighting devices.

Figure 1 shows an example of a conventional fundus camera in this building. In the figure, 1 is the subject's eye, 2 is a fixed objective lens, 3 is a relay lens that can be moved slightly for focusing, and 4 is a film. 5 is a quick return optical path switching mirror,
6 is an eyepiece lens, 7 is a perforated reflector, 8Fi illumination system lens, 9 is a ring slit, 10 is an observation lamp for normal observation, 11 is a stroke tube, 12 is a beam splinter,
Reference numeral 13 indicates a lens for the anterior segment of the eye which, when inserted into the optical system, shortens the subject distance of the entire system and moves the focus lens to the vicinity of the anterior segment of the eye, and 14 indicates a lens that coincides with the optical axis of the imaging/observation optical system. A lens frame for the lens 13 is provided so as to be movable in a direction orthogonal to the optical axis so that the lens 13 can be inserted into the optical system; 15 is an anterior segment illumination fixed to the lens frame 14; 16 is a light shielding plate that is fixed to the lens frame 14 and can completely block the light beam from the observation lamp 10 only when the anterior segment lens 13 is inserted into the optical system; 17 is a housing; 18 is a housing With the housing hole drilled in 17,
The anterior ocular segment illumination light flux passes through this hole 18' and exits, and when the anterior ocular segment illumination lamp 15 moves from the position of the housing hole 18, the wall of the housing 17 blocks the anterior ocular segment illumination luminous flux. The effect will be explained on the 0th order. First, the lamps 10 and 15 are turned on and inserted into the lens frame 14 between the one-to-one lens 2 and the perforated reflector 7 as shown in the figure, then the illumination light beam from the lamp 15 passes through the entire housing hole 18 and reaches the anterior ocular segment. and even illuminates the vicinity of the eyelids.

An observer looking through the eyepiece lens 6 aligns the relay lenses and operates an operating mechanism (not shown) so that the pupil is located in the center of the observation field of view. % light shielding 17f11
6 blocks the illumination light flux from the observation lamp 10, and prevents this light flux from being reflected on the surface of the anterior segment lens 13, the angle ρ surface, etc., and making it difficult to see the field of view. Next, lens frame 1
When the anterior segment lens 13 is removed from the imaging/observation optical system by moving the lens 4, the luminous flux of the anterior segment illumination lamp 15 is blocked, and the luminous flux from the observation lamp 1o is blocked. The light is reflected by the reflecting mirror 7 and illuminates the fundus of the eye via the objective lens 2. The reflected light from the fundus passes through the objective lens 2° and tip adjustment lens 3, is reflected by the optical path switching mirror 5, enters the eyepiece lens 6, and is provided for observation. In addition, when photographing, a photographing switch (not shown) is pressed to cause the strobe tube 11 to emit light, and at the same time, the optical path switching mirror 5 flips up (9) or at the same time, the shunter opens and a beam of light enters the film surface 4.
Photography will take place.

Figure 2 shows an example of a conventional non-mydriatic fundus camera that illuminates with infrared light and receives the light with an infrared image pickup tube for observation. In the figure, F is a filter that allows only infrared light to pass;
Reference numeral 9 indicates an infrared camera tube for monitoring which is kept in operation at all times during use, and reference numeral 20 indicates a microsinch for detecting insertion or withdrawal of the anterior segment lens 13 into the optical system. Other elements similar to those shown in FIG. 1 are given the same reference numerals. In the illustrated state, the anterior segment lens 13 is retracted outside the optical system.

The observation lamp IO is turned on, and when only the illumination light beam is infrared, the infrared imaging tube 19 is activated, and conversely, the anterior segment illumination lamp 15 is turned off. Also, anterior segment lens +3
When the lens frame 14 is moved in order to be inserted into the optical system, the microsinch 20 is switched, the anterior segment illumination lamp 15 is turned on, and the observation lamp 10 is turned off.
There is no illumination flux for normal observation.

Two types of conventional examples of this comb-type fundus camera have been described above. In the conventional example described in connection with FIG. An anterior segment illumination lamp 15 like a frame 14 and a light shielding plate 16
There are disadvantages in that not only all the connecting members are required to integrally connect the two, but also space is required to move each of these members. Further, in the conventional example described in connection with FIG. 2, since the micro-sinch 20 is required, there is a drawback that adjustment thereof and wiring man-hours are required. Furthermore, all of these conventional systems have the disadvantage of requiring a dedicated light source for illuminating the anterior segment of the eye in addition to the light source for fundus observation.

In view of the above circumstances, the present invention provides a fundus camera in which light from the same light source can be used as both fundus illumination light and anterior segment illumination light by switching reflectors disposed within the optical system. First of all, this will be fully explained based on the first embodiment shown in FIGS. A relay lens that forms an image, 24 is a reflecting mirror 25
27 is a reflector that can be switched between a solid line position and a chain line position, 28 is an objective lens, 29 is an eye to be examined, 30 31 is a small-diameter reflecting mirror placed near the ring slit 26, 32 is a photographic lens, and 32.
33 is a reflecting mirror that can be switched between the solid line position and the chain line position;
34 is a film surface, 35 is an eyepiece lens, 36 is an optical system for observing the anterior segment of the eye, and 37 is a light source 21 for emitting an observation light and a reflecting mirror 27.
One end surface 37a is placed in a position where the light flux reaching the end point 27 is not interrupted, and is placed in a position where it can receive the reflected light from the reflected mirror 27 when the reflecting mirror 27 is switched to the chain line position. and the other end 37b disposed toward the anterior segment of the eye 29 to be examined. Note that the image of the ring slit 26 is transmitted through the objective lens 28 to the eye 29 to be examined.
The image is formed near the iris of the eye to illuminate the fundus of the eye.

Since the fundus camera according to the present invention is configured as described above, when observing the fundus, the reflecting mirrors 27, 32 and 33 are both in the solid line position, and the illumination light emitted from the observation light source 21 is transmitted to the relay lens 22 and 24, reflecting mirrors 25 and 27, and glasses 27, 30 through the objective lens 28. 32 and 33,
The light reaches the observer's eye via the eyepiece 35. When photographing the fundus image, the first reflecting mirror 32 is switched to the chain line position and the fundus image is sent onto the entire film plane 34. In this case, the reflector 2
7 is at the solid line position tK, so the end surface 37a of the light guide 37
The light does not reach the area, so the anterior segment of the eye is not illuminated. Next, when observing the anterior segment of the eye, the reflector 27, 33 may be switched to the chain line position. That is, when the reflector 27, 33 is switched to the chain line position, an optical path passing through the optical system 36 for observing the anterior segment of the eye is formed, and the anterior segment of the eye and its surroundings can be observed.
In this case, the illumination light emitted from the observation light source 21Th passes through the relay lens i22 and the reflecting mirror 241, and then passes through the reflecting mirror 25.
7 and is reflected by the light guy end face 37.
The area around the anterior segment of the eye 29 to be examined is illuminated by the light #1 emitted from h. In this case, the other end surface 37b of the light guide 37 may be configured and arranged so as to illuminate the area around the anterior segment from a point near the objective lens 28, as shown in FIG. 3, or as shown in FIG. They may also be arranged in a ring shape around the entire circumference of the objective lens 28. Furthermore, the other end surface 37bk can be divided and arranged at several locations to obtain an illumination method that does not create shadows. FIG. 5 shows a second embodiment of the present invention.

In this embodiment, a reflector 38 is used instead of the light guy r37.
This example differs from the first example in that it uses .

Since other points are the same as in the first embodiment, the same elements as those in the first embodiment are denoted by the same reference numerals, and a description of their structure and operation will be omitted.

According to the configuration of the present invention described above, the brightness of the anterior eye illumination changes depending on the observation light source 21, but if you want to avoid this, you can move the reflectors 27 and 33 to the chain line position. The switching signal may be used to set the voltage applied to the observation light source 21 to a preset constant value so that the light source 21 always has a constant brightness.

As described above, according to the present invention, the light source for fundus observation can also be used as the light source for illuminating the anterior segment of the eye, so that the light source exclusively for illuminating the anterior segment as in the conventional fundus camera is not used as the light source for observation. Not only is it not necessary to provide a separate light shielding section 14f, which must shield one observation light when illuminating the anterior ocular segment, the fundus camera itself can be configured to be extremely small and compact. Furthermore, since the reflector for switching between the fundus observation optical path and the anterior segment observation optical path is also used as a scoop for switching between the fundus illumination optical path and the anterior segment illumination optical path, there is a moving light source and a light shielding member. This combination reduces the number of component parts and allows the nupaine inside the fundus camera body to be used more effectively. Furthermore, compared to conventional fundus cameras, this camera requires less adjustment and wiring, and since the light source does not move, there are fewer malfunctions such as lamp burnouts.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an example of a conventional fundus camera having an anterior segment illumination system. Fig. 2 is a cross-sectional view showing another conventional example.
The figure is a configuration diagram of a fourth embodiment of the fundus camera according to the present invention.
The figure is an enlarged perspective view showing an example of a configuration different from that shown in FIG. 3 of the exit end surface of the light guide, and FIG. 4 is a configuration diagram of main parts of another embodiment of the present invention. 21... Observation light source, 22.24... Relay lens. 25.27, 30, 32, 33.38...Reflector, 2
6... Ring slit, 28... Objective lens, 29
. . . Eye to be examined, 31 . 11 Figure 5 Figure 2 Procedural amendment (method) April 16, 1980 Commissioner of the Japan Patent Office Sir 1, Indication of the case Patent application No. 184744/1983 λ Name of the invention Fundus camera 3, Person making the amendment Patent applicant 2-43-2-54 Hatagaya, Shibuya-ku, Tokyo, Agent 5, Date of amendment order March 30, 1980 6, Brief description of the application to be amended and the drawings in the specification column. 7. Contents of amendment (1) Amend the application as attached. (2) Change “Fig. 4” on page 11, line 3 of the specification letter to “Fig.
"Fig." is corrected.

Claims (3)

[Claims] (1) A fundus camera equipped with an anterior segment observation optical system and a fundus observation optical system, characterized in that anterior segment illumination and fundus illumination are performed using the same light source. (2) In a fundus camera equipped with an optical system for observing the anterior segment of the eye, an optical system for observing the fundus, and a reflector for switching these optical systems into a used state and a non-used state, the anterior segment illumination and the fundus illumination are used. In addition, when the optical system for fundus observation is put into use by switching the reflector, the illumination light for the anterior segment of the eye is simultaneously blocked, and the optical system for observing the anterior segment of the eye is simultaneously blocked. A fundus camera characterized in that when the system is put into use, the fundus illumination light is simultaneously shut off. (3) In a fundus camera equipped with an optical system for observing the anterior segment of the eye and an optical system for observing the fundus, the same light source can be used for illuminating the anterior segment and the fundus, and the light source is used for illuminating the anterior segment and the fundus. 1. A fundus camera characterized in that, when the light source is switched to be used for the purpose, the light source is set to a predetermined brightness by a signal generated by the switch.