JPS5829448A - 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 that performs alignment by switching to the anterior eye segment observation optical system by switching the optical path, and the above-mentioned optical path switching operation that must be performed every time the eye to be examined is changed. This is about a fundus camera that has become unnecessary.

When using a fundus camera, it is important to properly align the optical axis of the fundus camera's optical system with the center of the pupil of the subject's eye to prevent harmful reflected light from the subject's eye from entering the observation/photographing optical path. Therefore, a fundus camera was developed that was equipped with an anterior segment observation optical system for alignment and was able to observe the anterior segment image from the eyepiece for the observation optical system by switching the optical path. ing. However, since this alignment must be performed every time the eye to be examined changes, the optical path must also be switched to the anterior segment observation optical system each time, and this operation is extremely troublesome.

In view of the above problems, the present invention aims to provide a fundus camera that automatically switches the optical path to the anterior segment observation optical system every time the eye to be examined changes, thereby eliminating the need for this operation. However, this will be explained based on one embodiment illustrated below. Fig. 1 shows the overall configuration of a book and fundus camera, where 1 is an observation light source, 2 is a concave reflector, and 3 is a condenser. A light lens, 4 is a photographing light source placed at the imaging position by the condensing lens 3 of the observation light source 1, 5 is a condensing lens, and 6 is near the imaging position by the condensing lens 5 of the photographing light source 4. Arranged ring slits, 7 is a reflecting mirror, 8 is a relay lens,
9 is a reflecting mirror 7. Ring slit 6 by relay lens 8
An apertured reflector is placed at a position where the image of the eye is projected, and together with an objective lens (to be described later), these constitute a fundus illumination optical system.

10 is an objective lens, 11 is a relay lens, 12 is a flip-up mirror for switching the optical path in the direction of the eyepiece 16 during observation and in the direction of the video recording medium 14 during shooting, and 15 is a reflecting mirror. It constitutes the fundus observation/photography optical system. 16 is a light source for illuminating the anterior segment of the eye, 17 is a small objective lens, 18 is a reflector, 19 is a relay lens, and 20 is an observation lens.
A mirror 12 that is removably placed in the imaging optical path and is either withdrawn from the optical path during fundus observation and imaging, or is inserted into the optical path and flips up the light emitted from the anterior segment when observing the anterior segment of the eye.
These are flip-up mirrors 122, reflecting mirrors 15. Together with the eyepiece lens 15, it constitutes an anterior ocular segment observation optical system. Reference numeral 21 denotes a fundus camera body incorporating each of the optical systems described above, and 22 is mounted on a fixed base 26 so as to be movable back and forth and left and right, and the fundus camera body 21 is fixed to the upper surface of the base 26 via a support 24. A movable base, 25 is a joystick for moving the movable base fixed to the movable base 22, and 26 is a rear support fixed to the fixed base 23 to stably support the subject's jaw in a prescribed position. . 27 is a face detector fixed to the top of the chin rest 26 and is composed of a microswitch or the like that detects whether the subject's face is in a specified position by detecting the presence or absence of the chin; 28 is a fixed base; A sign 29 made of, for example, a belt-shaped mirror is fixed on the center line in the left and right direction on the upper surface of the movable base 26, and 29 is fixed on the center line in the left and right direction on the lower surface of the movable base 22, and momentarily receives the reflected light from the sign 28. A left/right movement detector (see Fig. 2) consisting of a reflective type 7 sensor, etc., detects passage of the movable base 22 through the center, that is, movement of the movable base from either the left or right side to the other (see Fig. 2); 3° is the fundus camera body 21 31 is a face detector 27, which is a manual self-resetting type optical path changeover switch that is fixed to the anterior eye segment observation optical system and the fundus observation/photography optical system, and instructs to change the optical path from one to the other. Left and right movement detector 29. A control circuit (FIG. 6) to which the optical path changeover switches 30 are connected, 32 is the control circuit 3
A power switch 66 connected to 1 is a switching mirror drive device (FIG. 6) which is connected to a control circuit 31 and inserts/removes the switching mirror 20 into the observation/photographing optical path in response to a signal from the control circuit 31. When there is an input from only the power switch 32 or from the power switch 32 and at least one of the face detector 27 and the left/right movement detector 29, the control circuit 31 operates the switching mirror drive device 53 to switch the mirror. 20 into the observation/photographing optical path, and when there is a human power from the optical path changeover switch 50, the changeover mirror drive device 36 is actuated to put the changeover mirror 20 in the opposite state to the previous state. , these constitute an optical path switching circuit.

Since the fundus camera according to the present invention is constructed as described above, when the observer first turns on the power switch 32, the switching mirror 20 is inserted into the observation/photographing optical path by the action of the control circuit 61, and is placed in the eyepiece. Light emitted from the anterior segment of the eye is made to enter the lens 13. Therefore, the observer performs alignment for one eye of the subject. Next, when the observer presses the optical path switching switch 30, the switching mirror 20 is moved away from the observation/photographing optical path by the action of the control circuit 31, and the light emitted from the fundus is made to enter the eyepiece lens 13. Therefore, the observer adjusts the focus and determines the photographing range here.

Subsequently, the flip-up mirror 12 is flipped up so that the light emitted from the fundus enters the image recording medium 14, and the photographing light source 4 is turned on to photograph the fundus. Next, in order to observe the subject's other eye, when the observer grasps the joystick 25 and moves the fundus camera body 21 laterally together with the movable base 22, the central part of the movable base 22 passes from side to side. The movement detector 29 detects the movement, and this detection signal is input to the control circuit 311. Then, control circuit 3
1, the switching mirror 20 is switched again to the anterior eye observation side. Therefore, the observer can now perform alignment with respect to the other eye. Next, when the observer presses the optical path switching switch 30 again, the switching mirror 20 is switched to the fundus observation/photographing side in the same way as above, so the observer can now observe and photograph the fundus of the other eye. can. If you wish to readjust the alignment at this point, just press the optical path changeover switch 3a again, and this time the changeover mirror 20 will be switched to the anterior eye observation side, so readjust the alignment. It can be done. Thereafter, by further pressing the optical path switching switch 30, the switching mirror 20 is switched again to the fundus observation/photographing side. Next, after the observation and photographing of the fundus of the first subject is completed, when the second subject places his chin on the backrest 26, the presence of the chin is detected by the face detector 27, and this detection signal is detected. is input to the control circuit 61. Then,
The switching mirror 20 is switched to the anterior eye observation side by the action of the control circuit 31. Therefore, the observer can now perform alignment with respect to one eye of the second subject. In this way, a series of operations are performed using the five fundus cameras, that is, alignment and fundus C observation/photography.As mentioned above, the main fundus camera automatically switches the optical path to the anterior eye optical system each time the eye to be examined changes. Since this operation is now performed, this operation is no longer necessary, and the overall operability is greatly improved.

As described above, the fundus camera according to the present invention eliminates the need to switch the optical path to the anterior segment optical system each time the eye to be examined changes, and the overall operability is greatly improved. This is a very important advantage for this type of device.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment of a fundus camera according to the present invention, FIG. 2 is a rear view of the base portion of the above embodiment, and FIG. 3 is a block diagram of the optical path switching circuit of the above embodiment. 10...Objective lens z, 11...Relay lens, 12...Flip-up mirror, 13...
...eyepiece. 14...Video recording body, 15...Reflector, 16...
...Light source for anterior segment illumination, 17°°°° small objective lens, 18°°0 reflector, 19° relay lens, 2o.
... Switching mirror, 21 ... Fundus camera body, 22
...Movable base, 25...Fixed base, 24...
...Strut, 25...Joystick, 26...
Chin rest, 27...face detector, 28...marker, 29...left/right movement detector, 50...optical path changeover switch, 31...control circuit, 32... - Power switch, 63...Switching mirror drive device. Figure 1

Claims (1)

[Claims] In a fundus camera that performs alignment by switching to the anterior segment observation optical system by switching the optical path, there is a face detector that detects that the subject's face is in a specified position, and an optical system that detects that the subject's face is in a specified position. a left-right movement detector that detects movement in the left-right direction with respect to the face, a power switch, and an input from only the power switch or from the power switch and at least one of the face detector and the left-right movement detector; A fundus camera comprising: an optical path switching circuit that switches the optical path to the anterior segment observation optical system when