JPS6231941B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevating and tilting device for an ophthalmological examination device,
It is particularly suitable as a rocking device for a fundus camera for observing or photographing the fundus.

Conventionally, devices have been commonly used in which a fundus camera is oscillated in the horizontal and vertical planes, or only in the vertical plane, centered around the iris of the subject. This is a necessary device to adjust the field of view to the peripheral area of the fundus when observing or photographing the fundus, but each time the field of view is reset to a different field of view, the distance between the subject's eyes and the objective lens of the camera body is adjusted. Since positioning and distance adjustment are performed, it is desirable to provide smooth operability without requiring much effort to swing the camera body so that more attention can be paid to positioning and distance adjustment. For this reason, when the device body swings by a predetermined amount, it is necessary to detect this and stop the driving of the drive means for swinging the device body.

The purpose of the present invention is to meet this type of need, and an example will be described below in which vertical swinging can be carried out quickly and effortlessly by means of an electric motor operated by hand or a foot switch.

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 by a bearing E ₃ so as to be rotatable and not in contact with each other, and the central axis of rotation of this bearing E ₃ passes through the center point P of the subject's iris. Here, the iris or its vicinity acts as the exit pupil during observation and photography, but regardless of the tilt angle of the optical axis of the imaging system, if the iris or its vicinity acts as the exit pupil, the corneal reflected light will flare, etc. It is known that this does not cause any inconvenience. 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. Figure 2 depicts the details of the swinging section, and Figure 3 shows its cross section. Number 2 is the mounting plate.
It is located inside the housing of the swinging unit, and is screwed to the support lever _E2 to support the fundus camera body. 3 is 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.
In particular, the arcuate grooves 3a and 3b of the swing arm 3 form an arc centered on the point P. Reference numerals 4, 5, and 6 denote roller bearings, which are supported on the mounting plate 2 by shafts 7, 8, and 9, and the peripheral surfaces of the rollers fit into the inner surfaces of the grooves 3a and 3b, so that the swing arm 3 is guided around point P and swings 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 a chain 10 as a long transmission body for being driven is arranged along the mounting surface. One way to fix the chain 10 is to screw the ends of the chain with screws 11, 11', etc., as shown in FIG. This chain 1
0 meshes with a sprocket 20 forming a part of the drive body, and 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 24b
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 more than a required 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 33 rotates together with the worm gear 32 to send the chain 10 meshing with the sprocket 20, and the swing 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 contacts the micro switch 39 and turns it off, cutting off the power supply circuit to the motor 21 as shown in FIG.
Stop 1.

With the above configuration, it is sufficient to have at least two roller bearings to guide and support the swinging arm. 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.

Furthermore, when observing the fundus, the examiner may observe the subject from the side of the camera body, so it is desirable that the swinging part attached to the body not protrude too much to the side of the fundus camera. Therefore, a small and powerful DC motor is used, and since the motor rotation speed is high, it is decelerated in two stages to obtain an appropriate rotation speed.

Furthermore, since the rotation of the motor is controlled by voltage, a certain arbitrary rotation speed can be obtained by changing the voltage. The voltage setting is performed when assembling the device, but in the case of fundus photography, which is mainly based on fluorescence photography, the swing speed must be set to an appropriate value to follow the blood flow in order to observe and photograph changes in blood flow over time. The voltage of the motor can be adjusted accordingly.

According to the present invention described above, when the device main body swings by a predetermined amount, the driving means for driving the device main body is stopped by detecting this, so that the swinging arm connected to the fundus camera main body is The object to be transported is provided in an arc shape, a drive wheel that meshes with the object is provided on the support base, and the drive wheel is rotated to swing the fundus camera body, so the absolute position of the drive wheel changes as the user moves up and down. The position does not change over time, and remains at a constant position, improving operability. Furthermore, when the fundus camera body swings by a predetermined amount, the elevating and elevating operations are ensured by the detection means that detects this and stops the driving of the drive wheel.

[Brief explanation of the drawing]

FIG. 1 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 an enlarged view of the chain attachment part.
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, 1
0 is a chain, 20 is a sprocket, and 21 is a DC motor.

Claims (1)

[Scope of Claims] 1. An ophthalmologic examination device capable of swinging an ophthalmologic examination device body including the objective optical system with respect to a support member of the ophthalmologic examination device body around a virtual point spaced a predetermined distance from the objective optical system. The swinging device includes: a swinging arm that is connected to the ophthalmological examination device main body and has an arc shape centered on the virtual point; a swinging arm support member to be coupled; a driven elongated transmission body provided in an arc shape along the swinging arm on a predetermined surface of the swinging arm;
a driving body that engages with the driven elongated transmission body and is provided on a support member of the ophthalmological examination device main body and swings the ophthalmological examination device main body, and the ophthalmological test device main body swings by a predetermined amount; 1. A swinging device for an ophthalmological examination instrument, characterized in that the swinging device is provided with a detection means for detecting and stopping the driving of the driving body. 2. The swinging device for an ophthalmological examination device according to claim 1, wherein the swinging arm support member is a plurality of bearings provided along the swinging arm. 3. The swinging device for ophthalmological examination equipment according to claim 1, wherein the driven long transmission body is a chain.