JPH024642Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an ophthalmologic apparatus equipped with a fundus camera for observing and photographing the fundus and external eye of an eye to be examined.

(Prior Art) When observing or photographing the fundus of the examined eye using a fundus camera, the optical system of the examined eyeball is included, so depending on the degree of myopia or hyperopia of the examined eye, the optical system of the fundus camera may be The system is configured to focus on the fundus of the eye by adjusting the diopter to the minus or plus side, centering on the zero) diopter, but it is useful for observing and photographing not only the fundus of the subject's eye but also the vicinity of the outer eye. The important role played by the government is also being recognized and played.

In this case, the distance between the eye to be examined and the objective lens of the fundus camera, that is, the working distance, is made larger than when photographing the fundus, without passing through the ocular optical system of the eye to be examined, so that the image of the external part of the eye is appropriately large. The distance is adjusted so that the eye can be observed and photographed, but from the viewpoint of normal fundus observation and photographing, it is necessary to adjust the diopter (focusing) significantly to the plus side.

In order to avoid such large diopter adjustments, it is necessary to insert a correction lens to correct the diopter in a position that does not strain the optical space (between the perforated mirror and the focusing lens). In fact, there are many fundus cameras that have optical systems that incorporate such lenses.

When observing and photographing the fundus of the eye to be examined, the above-mentioned correction lens is removed from the optical path of the optical system of the fundus camera, and when observing and photographing the external part of the eye, the correction lens is inserted into the optical path and the working distance is set at a predetermined distance. If you adjust the diopter after moving the lens a distance away, you can focus with a small amount of adjustment.

(Problem to be solved) In the conventional fundus camera as mentioned above,
Moving the operating stand for alignment adjustment back and forth with respect to the eye to be examined, that is, expanding and contracting the working distance, and moving the correction lens in and out of the observation and photographing optical path of the fundus camera can be done by manually operating a dedicated operating unit separately. Therefore, the current situation is what is happening.

For example, after observing and photographing the fundus image of the subject's eye, the working distance is then extended to observe the image of the external part of the eye.
When trying to take a picture, the focus position is vastly different between the fundus and the outer part of the eye, so the examiner sees the blurred image and intuitively tries to operate the focus knob. After doing that operation, I realized that there was a dedicated correction lens, and I often ended up doing unnecessary operations.

Contrary to the above, when attempting to observe the fundus image by shortening the working distance after observing the external eye image, the user tends to perform the same wasteful operations as described above.
Although the manual operation of moving the correction lens in and out of the optical path is a relatively simple operation, in relation to the operation of the focus knob, it not only gives the impression of being psychologically complicated and troublesome, but also is wasteful. The drawback was that it was easy to operate.

(Means for Solving the Problems) In order to solve the above-mentioned conventional problems, the present invention supports a movable table movable in the horizontal direction on a pedestal, and a An ophthalmological apparatus equipped with a fundus camera, comprising: a detector for detecting forward and backward movement of the fundus camera facing the eye to be examined; and a correction mechanism including a correction optical system operated by a signal detected by the detector. It was adopted.

(Function) According to the above configuration, when the fundus camera is moved back and forth from observing and photographing the fundus of the eye to be examined to observing and photographing the external eye part, or in the reverse order, the correction optical system automatically operates. The examiner can see a focused image by simply adjusting the focus knob slightly.

(Example) The details of the present invention will be explained with reference to the drawings.

Figures 1 and 2 are optical path diagrams of the optical system of the fundus camera according to the present invention. Figure 1 shows the positional relationship of the focused state when observing and photographing the fundus of the eye to be examined. The objective lens 2 facing E is
They are located a distance a apart along the optical axis L1.

Behind the objective lens 2, a perforated mirror 3, a focusing lens 4, an imaging lens 5, and an oblique movable mirror 6 are arranged in order on the optical axis L1, and a film F is further arranged behind them. be.

A focusing glass 7 and a mirror 8 are arranged on the optical axis L2 of the movable mirror 6, which branches off from the point where it intersects with the optical axis L1, and on the optical axis L3, which is bent from the point where the mirror 8 intersects with the optical axis L2. An eyepiece lens 9 is arranged at.

As described above, from the objective lens 2 through the movable mirror 6,
Everything up to the eyepiece lens 9 constitutes an observation optical system.

Furthermore, the optical axis of the movable mirror 6 indicated by a broken line is
When it is in a position retracted from the optical path of L1, from the objective lens 2 to the imaging lens 5, the film F
Together with this, they constitute photographic optics.

On the other hand, on the optical axis L4 that intersects with the optical axis L1 passing through the center of the perforated mirror 3, from the side farther from the perforated mirror 3, an illumination lamp 11, a first condenser lens 12, a strobe lamp 13, and a second condenser lens are arranged. 14, a ring slit 15, a first relay lens 16, a reflection removing plate 17 made of a transparent material such as glass with a small black dot in the center, and a second relay lens 18 are arranged so as to be located therein.

The illumination optical system includes the above-described illumination lamp 11 to the second relay lens 18, the perforated mirror 3, and the objective lens 2.

When the illumination lamp 11 is turned on, the light passes through the lenses 12 and 14 and illuminates the ring slit 15.
The light is transmitted through the lens 16, the sunspot plate 17, the lens 18, and the perforated mirror 3, and reflected by the objective lens 2 to form an image of the ring slit 15 on the external eye of the eye E to be examined.

The illumination light passes through the pupil of the eye to be examined, diverges, and illuminates the fundus of the eye. The path of the illumination light is indicated by a dashed line in the figure.

Figure 2 shows the positional relationship of the focused state when observing and photographing the external eye part of the subject's eye.
The distance between and the objective lens 2, that is, the working distance, is a+b
In addition, a correction lens 10 enters the optical path between the perforated mirror 3 and the focusing lens 4, and the objective lens 2 and the focusing lens of the optical system for observing and photographing the fundus of the eye to be examined described above. 4. Construct a combined optical system together with the imaging lens 5 to correct the focal length of the extraocular segment of the eye to be examined.

The objective lens 2 is separated by a distance b from the eye E to be examined, and the correction lens 10 is located on the optical axis.
Other than entering the optical path of L1, the arrangement of the optical system is the same as that used when observing and photographing the fundus of the subject's eye as shown in FIG.

FIG. 3A is a side view showing the entire ophthalmological apparatus including the operating stand of the present invention, in which the fundus camera 1 has an optical axis L1.
At the top, the objective lens barrel 19 holding the objective lens 2 described above faces the eye E to be examined. By operating the focusing knob 20, the focusing lens 4 described above can be moved in the direction of the optical axis L1 and the focus can be adjusted.

Eyepiece lens barrel 21 with built-in eyepiece lens 9
The diopter of the focusing glass 7 can be adjusted by rotating it.

A film chamber 22 containing a film F is installed behind the optical axis L1.

A support post 23 is fixed to the bottom of the fundus camera 1, and is fitted into a support support 25C installed on the movable table 25, and is operated by operating the up and down handle 25d.
The support 23 moves up and down, and the fundus camera 1 is integrated with it.
It will also move up and down.

A control lever 27 equipped with a release switch 27a is attached to the movable table 25, and by tilting the lever 27, the movable table 25 and the fundus camera 1 held integrally therewith can be adjusted to move back and forth and left and right. It is configured as follows.

As shown in FIG. 3B, linear motion rails 24a and 24b are fixedly mounted on the frame 24 in parallel to the optical axis L1, and an intermediate platform 26 is mounted on the linear motion rails 24a and 24b.
The linear motion rail 2 integrated with the movable table 25 is guided by
5a and 25b are configured to be movable in a direction perpendicular to the optical axis L1.

A lens support 30 holding the correction lens 10 shown in FIG.
A switch 32 for switching the operation of the rotary solenoid 29 is fixed to the switch piece 32a, and a protrusion 24c is formed on the pedestal 24 facing the switch piece 32a. As a result, when the movable base 25 moves and the switch piece 32a of the switch 32 that moves integrally with it rides on the protrusion 24c,
The switch 32 is configured to operate the rotary solenoid 29 when switched.

On the other hand, a shaft support 28 for supporting a shaft 28a is fixed to one side of the pedestal 24, a chin rest 28b on which the subject's chin is placed is adjustable up and down, and a forehead support 28c is attached.

Next, the operation of this embodiment configured as above will be explained.

First, the main switch of the electrical system (not shown)
is in the "on" state, and at the same time the illumination lamp 11 is turned on.
is turned on, and the fundus camera 1 is placed in an operational standby position.

Next, the control lever 27 is operated to move the fundus camera 1 back and forth, so that the objective lens 2 held in the lens barrel 19 faces the subject's eye E, and the fundus of the subject's eye is observed and photographed. If you intend to do so, the observation field and focusing range should be set so that they are approximately appropriate when the distance is a working distance a.
In addition, the switch piece 32a is in a position where it is not in contact with the protrusion 24c, so the rotary solenoid 29 is not activated, and the correction lens 10 is in a position where it is evacuated from the optical path of the optical axis L1 shown by the broken line in FIG. 3C. be.

Furthermore, finely adjust the focusing knob 20,
The examiner confirms through the eyepiece lens 9 that the object is in optimal focus.

In addition, when trying to observe and photograph the extraocular part of the subject's eye, the working distance is a + b as shown in Figure 2.
While operating the control lever 27, move the fundus camera 1 back and forth so that the eyepiece 9
When the working distance becomes appropriate, the switch piece 32a rides on the protrusion 24c, the rotary solenoid is activated, and the correction lens 10 enters the optical path shown by the solid line in FIG. 3C. Then, the observation field of the external eye and the focusing range are set to be approximately appropriate, and then, as in the case described above, the optimum focusing state is achieved by finely adjusting the focusing knob 20. Manipulate.

(Effects) As explained above, according to the present invention, a correction mechanism including a detector for detecting the back and forth movement of the fundus camera facing the eye to be examined and a correction optical system operated by the signal detected by the detector is provided. By moving the fundus camera back and forth using the control lever, the correction lens automatically moves in and out of the optical path for observation and photography, allowing you to easily adjust the posture for observation and photography of the fundus of the eye to be examined and its external parts. Switching can be performed easily and erroneous operations can be prevented.

[Brief explanation of the drawing]

Figure 1 is an optical path diagram of the fundus camera according to the present invention.
FIG. 2 is also a part of the optical path diagram, and shows the state of observation and photography of the extraocular part of the eye to be examined. Figure 3A is an overall side view of the present invention;
FIG. 3B is a partial view taken along arrow B in FIG. 3A, and FIG. 3C is a view taken along arrow AA in FIG. 3A. 1... Fundus camera, 2... Objective lens, 3...
Hole mirror, 4...Focusing lens, 5
...Imaging lens, 9...Eyepiece lens, 10...Correction lens, 11...Illumination lamp, 19...Objective lens barrel, 20...Focusing knob, 21...
...Eyepiece lens barrel, 24...Base, 25...Moving table, 27...Control lever, 29...Rotary solenoid, 32...Switch.

Claims (1)

[Claims for Utility Model Registration] 1. An ophthalmological apparatus comprising a horizontally movable movable table supported on a mount and a fundus camera supported on the movable table, the fundus facing the eye to be examined. An ophthalmologic apparatus comprising: a detector for detecting forward and backward movement of a camera; and a correction mechanism including a correction optical system operated by a signal detected by the detector. 2. The ophthalmological apparatus according to claim 1, wherein the correction optical system is attached to the correction mechanism so as to be able to enter and exit the optical path of the observation and photographing optical system of the fundus camera. . 3. Registration of a utility model characterized in that the correction optical system is configured to move out of the optical path by a signal detected by the detector when the fundus camera moves to a position for observing and photographing the fundus of the eye to be examined. The ophthalmological device according to claim 2. 4. A utility model characterized in that when the fundus camera moves to a position for observing and photographing the extraocular part of the eye to be examined, the correction optical system enters into the optical path based on the signal detected by the detector. An ophthalmological device according to registered claim 2.