JPS6227816B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ophthalmological photographing device, and particularly to a device for performing stereoscopic photographing.

Although fundus photography is increasingly being used as a method for fundus examination, there is also an increasing demand for stereoscopic observation. Stereoscopic photography of the fundus involves moving the optical axis of the fundus camera to the left and right, centering on the visual axis, and taking a set of images of the fundus through the pupil of a desired eye to be examined.

In order to take such photographs, accurate positioning with respect to the eye to be examined is an important requirement in order to obtain photographs with good image quality and from which accurate measurements can be made. Furthermore, it is desirable to carry out left and right imaging before the condition of the eye to be examined changes much, and therefore it is important that left and right switching be performed quickly and smoothly.

The purpose of the present invention is to enable accurate and executable setting of the photographing optical axis for the eye to be examined for stereoscopic photography. means for regulating the movement range to a predetermined amount smaller than the specific movement range of the stage part (the range in which the stage part can move for normal left eye and right eye imaging), and a means for selecting activation or release of the regulating means. There is. An example will be described below.

Figure 1 is a side view of the fundus camera.
FIG. 2 is a view from above. In the figure, 1 is the fundus camera body, 1a is the objective lens barrel, 1
b is a film chamber. 2 is a stage on which the fundus camera body 1 is placed via a support. Reference numeral 3 denotes a fixed base that supports the stage 2 so that it can move freely in the front, rear, left and right directions. Reference numeral 4 denotes an operating stick, and when the operating stick 4 is tilted back and forth, the stage 2 moves forward and backward, and when it is tilted left and right, the stage 2 moves left and right. Furthermore, P is the subject and O is the operator.

The operator O moves the optical axis of the fundus camera body 1 by slightly tilting the operating stick 4 to the left and right, and sets two photographing positions in the pupil with the center separated by l as shown in Fig. 3. .

The configuration for setting this photographing position will be explained with reference to FIGS. 4 to 9.

FIG. 4 is an enlarged drawing of the main part, FIG. 5 is a sectional view taken along line AA, and FIG. 6 is a sectional view taken along line BB. The movable stage 2 and fixed base 3 in the figure are as described above, and a guide rail numbered 10 is screwed to the outer wall or internal tension of the stage 2. 11 is a slider, guide rail 10
It fits in and can be moved left and right. As shown in the cross section in FIG. 5, the guide rail 10 is recessed, and the sliding portion 11a of the slider 11
are combined. 11b is a rotating shaft portion with a male thread formed around it, and this male thread is connected to the lock knob 13.
As a result, when the lock knob 13 is turned to the left as shown in FIG. 8A, the lock knob 13 moves forward and tightens the rail 10 between the sliding portion 11a and the lock knob 13. The slider 11 can be fixed to the guide rail 10. Also, if you tilt it in the opposite direction, the tightening will be released (Figure B).

Next, reference numeral 12 denotes a guide pin attachment lever, one end of which is firmly coupled to the slider 11, and the other end of which the guide pin 14 is screwed in such a manner that it can be attached and removed. 1
Reference numeral 5 denotes a grooved plate for restricting movement, which is screwed to the fixed base, and this grooved plate 15 has a groove 15a in which the guide pin 14 engages. Since the groove 15a extends in the front-rear direction, it does not prevent the guide pin 14 from moving in the front-rear direction. In addition, since the diameter of the guide pin 14 is made smaller than the groove width, the slider 14 until the guide pin 14 hits the edge of the groove
1, that is, the stage 2 can be moved slightly in the left and right directions. 7A and 7B are for explaining the relationship between the diameter d of the guide pin 14 and the groove width L, and the length L
-d is the movable range of the slider 11.
Therefore, if L-d is set equal to l in Fig. 3, the optical axis spacing required for stereoscopic imaging can be achieved by simply moving the guide pin 14 within the groove and bringing the guide pin 14 into contact with both sides of the groove. This means that it is possible to set the . However, if the subject is an elderly person, it may not be possible to achieve sufficient mydriasis even if a mydriatic agent is instilled into the patient's eyes, so in that case, replace the guide pin 14 with another guide pin 14 with a slightly larger diameter. shall be replaced.

In the above example, the slider 11 was attached to the stage and the groove plate 15 was attached to the fixed base, but the attachment method may be reversed, or the groove plate may be provided on the mounting lever 12 and the guide pin 14 is installed on the fixed base. You can also set it up.

The operations for stereoscopic imaging will be explained below.

Move the fundus camera body to either the left or right eye of the subject's eye, and operate the operating rod 4 to move the stage 2 in the front-back direction so that the optical axis faces the right or left imaging position in Figure 3. . At this time, the lock knob 13 is in a state as shown in FIG. 8A, and a gap is created between the lock knob 13 and the rail 10 so that the slider 11 and the rail 10 are in a free state. As a result, the stage 2 moves along with the slider 11, the guide pin mounting lever 12, and the guide pin 14 in the left-right direction by the difference (L-d) between the groove of the groove plate 15 and the diameter d of the guide pin 14, as shown in FIG. 7B. The guide pin 14 moves, but after that the guide pin 14 moves to the groove plate 1.
5, the rail 10 will now move along the slider 11. Since the rail 10 is fixed to the stage 2, the stage 2 can move as a result.

Further, in the front-rear direction, the guide pin 14 is movable along the groove of the groove plate 15 in the direction of the arrow in FIG.
In this way, the optical axis of the fundus camera can be placed in front of one side of the imaging position of the subject's eye. Next, rotate the operating rod 4 to fix the stage 2, slide the slider 11 along the rail 10, and place the guide pin 14 on one side of the groove of the groove plate 15 as shown in FIG. 7B. As shown in Figure 8B, the lock knob 13 is rotated by the action of the screw, and the slider 11 and the lock knob 13 lock the rail 1.
0, the rail 10, slider 11, guide pin 12, lock knob 13, and guide pin 14 are all fixed to the stage 2. The amount of movement of the stage 2 is ultimately regulated by the guide pin 14 and the groove plate 15. By doing this, the stage 2 can only move by (L-d) in the left and right direction as shown in FIG.
In other words, by setting the distance l and L-d between the photographing positions in FIG. 3 to be equal, it is possible to restrict movement to only the necessary distance. Furthermore, even in this state, in order to maintain an accurate distance between the eye to be examined and the fundus camera, it is possible to move freely in the direction of the arrow as shown in Figure 5, making it possible to obtain clear photographs without flare etc. can. As described above, according to the present invention, it is possible to easily and quickly and accurately set the optical axis interval required for stereoscopic imaging using the selection means, and there is also an effect that the selection of the left eye and the right eye can be directly responded to.

[Brief explanation of the drawing]

Fig. 1 is a side view of the fundus camera, and Fig. 2 is its plan view. FIG. 3 is a diagram showing the relationship between the pupil and the stereoscopic imaging position. FIG. 4 is a plan view of the embodiment, FIGS. 5 and 6 are cross-sectional views, and FIGS. 7A and 7B are diagrams for explaining the relationship between the guide pin and the groove width. FIGS. 8A and 8B are partial plan views. In the figure, 1 is the fundus camera body, 2 is the stage, and 3
is a fixed base, 10 is a rail, 11 is a slider, 1
2 is a mounting lever, 13 is a lock knob, 14 is a guide pin, and 15 is a groove plate.

Claims (1)

[Claims] 1. A fundus camera body, a stage part on which the camera is placed, and a fixed base that movably supports the stage part, and a first camera body located in the left and right direction of the pupil of the eye to be examined.
In an ophthalmological photographing device that selectively extracts a fundus photographing light beam from a region and a second region, by substantially integrating with the fundus camera body, the movement range of the fundus camera body in the left and right direction can be changed from the first and second regions. A regulating means that can be regulated to a predetermined amount corresponding to the area, and regulation and release of the regulation of the regulating means are selected, and when release of regulation is selected, movement of the fundus camera body corresponding to left and right eye switching is enabled. An ophthalmological photographing device characterized by having a selection means.