JPS6226082Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an elevation and depression swinging device for an ophthalmoscopy device.
In particular, the present invention relates to a rocking device for a fundus camera for observing or photographing the fundus.

It has been known to observe and photograph the peripheral part of the fundus by swinging a fundus camera in the horizontal and vertical planes around the subject's pupil.

The present invention aims to provide a novel device for freely swinging the fundus camera body within a vertical plane.

Examples will be described below with reference to the drawings.

In FIG. 1, X represents the subject and Y represents the examiner. In addition, 1 is the fundus camera body, and the observation and photographing system is housed inside the housing.
is an objective lens barrel, and 1b is a finder.
Next, A is a stage, B is a slide table that can be moved in parallel to stage A, back and forth, left and right, and C is a
This is a vertical drive unit that is fixed to the slide stand and moves the camera body 1 in the vertical direction. D is a swinging part whose structure will be explained in detail later, and is connected to the camera body 1. Next, E ₁ is a support bar fixed to the vertical drive unit C, E ₂ is another support bar fixed to the swinging unit D, and both support bars E ₁ and E ₂ are support members for the fundus camera body. and are connected to each other by a bearing E ₃ so as to be free to rotate and not to come into contact with each other, and the central axis of rotation of this bearing E ₃ passes through the center point P of the iris surface of the subject. Here, the iris or its vicinity becomes the active surface of the exit pupil during observation and photography, and regardless of the inclination of the optical axis of the imaging system, if the iris or its vicinity becomes the exit pupil, the corneal reflected light will flare. It is known that no significant inconvenience will occur.

Therefore, even when the camera body is swung in a vertical plane by the oscillating portion D, it is swung so that the point P becomes the center. FIG. 2 depicts details of the swinging section, and FIG. 3 shows its cross section. Reference number 2 is a mounting plate, which is located inside the housing of the swinging part and is screwed to the support lever _E2 . Reference numeral 3 denotes a swinging arm, which is screwed to the side plate 1' of the camera body and has the cross-sectional shape shown in Figure 3, especially the arcuate groove 3a of the swinging arm.
and 3b form an arc centered on point P.
4, 5, and 6 are roller bearings, respectively, and shafts 7,
8 and 9 on the mounting plate 2, and the peripheral surface of the roller fits into the inner surface of the grooves 3a and 3b, so that
The swinging arm 3 swings while being guided around the point P without wobbling.

Here, the roller bearings 4, 5, and 6 function as swing arm support members that swingably support the swing arm 3.

Furthermore, 3c is a chain mounting surface, and this surface also forms an arc centered on point P, and the chain 10 as a driven elongated transmission body is arranged along the mounting surface. To fix the chain 10, as shown in Figure 4, the end of the chain 10 is secured with screws 11 to 1.
One method is to tighten it with screws 1. This chain 10 is connected to a sprocket 2 forming part of a driving body.
The drive system of the sprocket 20 will be described below.

Reference numeral 21 denotes a DC motor, which is fixed to the mounting plate 2 via a holding plate 22. 23 is a worm, and 24 is a rotating shaft of the worm. This shaft 24 is supported by bearings 25a and 25b fixed to the mounting plate 2, and is connected to the drive shaft of the motor 21 via a coupling 26. 27 is the worm gear and worm 2
3 and is also fixed to the rotating shaft 28. 29
Bearings a and 29b support the shaft 28, and these bearings 29a and 29b are screwed to the mounting plate 2 through a retaining plate 30. 31 is another worm, rotating shaft 2
It is pinned to 8. Further, numeral 32 in FIG. 3 is a worm gear, which is threadedly engaged with the worm 31, and 33 is a rotation shaft of the worm gear 32. The rotating shaft 32 has the aforementioned sprocket 20 fixed thereto, and is supported by bearings 34a and 35b.
is fixed to the mounting plate 2 by the retainer plate 35, and the bearing 34b
is fixed to the mounting plate 2 by another retaining plate 36.

Next, reference numeral 37 in FIG. 2 is a switch changeover lever, which is fixed to the center of the swing arm 3. Reference numerals 38 and 39 are micro switches, respectively, and when the optical axis of the objective lens 1a is tilted vertically by the same angle with respect to the horizontal direction, the lever 37 is activated by the micro switch 38 or 3.
9, and the fixing members 40
Alternatively, it is fixed to the mounting plate 2 by 41.

Figure 5 shows how the electrical circuit is connected.
Reference numeral 42 denotes a direction changeover switch, which may be a manual changeover type, or may be configured as a seesaw switch so that it can be operated by foot. 43 is a DC power supply.

Assume that in the above-described configuration, the direction changeover switch 42 is operated to select, for example, upward as the rocking direction, as shown in FIG. At this time, if the switch changeover lever 37 in FIG. 2 is located between the microswitches 38 and 39, both microswitches are electrically connected, and the motor 21 is activated and rotates in a predetermined direction. Then, the coupling 2 is attached to the rotating shaft of the motor 21.
The shaft 24 connected at 6 rotates, and the worm 23 rotates. The worm gear 27 that is screwed into the worm 23 is driven, and the rotating shaft 28 rotates and the worm 31 rotates, so the worm gear 32 rotates. Therefore, the sprocket 20 connected by the shaft 38 rotates together with the worm gear 32 to send the chain 10 meshing with the sprocket 20, and the swinging arm 33 has the inner surfaces of the grooves 3a and 3b aligned with the roller 4,
5 and 6 are rotated and moved, and the camera body 1 swings so that the objective lens faces upward.

However, when the swing arm 33 swings beyond a certain level, the switching lever 37 comes into contact with the micro switch 39 and turns it off, cutting off the power supply circuit to the motor 21 as shown in FIG. to stop.

With the above configuration, it is sufficient to have at least two roller bearings to guide and support the swinging arm. At least three bearings are provided to limit rattling, and one of these three bearings can be adjusted in position in the radial direction of the swing arc.

According to the present invention, the fundus camera body can be rocked extremely smoothly, which has the effect of improving operability during observation and photography.

In particular, according to the present invention, the absolute position of the drive vehicle does not change with the elevation/elevation operation, and remains at a constant position, thereby improving operability.

[Brief explanation of drawings]

The first side is a perspective view showing the appearance of the embodiment. FIG. 2 is a longitudinal sectional view of the embodiment. FIG. 3 is a sectional view taken along the - section in FIG. 2. Figure 4 is a large diagram of the chain mounting area.
FIG. 5, FIG. 6, and FIG. 7 are electrical circuit diagrams, respectively. In the figure, 1 is the fundus camera body, 2 is the mounting plate, 3 is the swing arm, 7, 8, 9 are roller bearings,
10 is a chain, 20 is a sprocket, and 21 is a DC motor.

Claims (1)

[Claims for Utility Model Registration] 1. A swingable fundus camera that is capable of swinging a fundus camera body including the objective optical system relative to a supporting member of the fundus camera body around a virtual point spaced a predetermined distance from the objective optical system. The swinging device includes: an arc-shaped swinging arm that is coupled to the fundus camera body and centered on the virtual point; and a swinging arm that swingably supports the swinging arm and is coupled to a support member of the fundus camera body. an arm support member; an elongated driven transmission body provided in an arc shape along the swinging arm on a predetermined surface of the swinging arm; A rocking device for a fundus camera, comprising a driving body provided on a support member. 2. The rocking device for a fundus camera according to claim 1, wherein the rocking arm support member is a plurality of bearings provided along the rocking arm. 3. The rocking device for a fundus camera according to claim 1, wherein the driven elongated transmission body is a chain.