JPH0724302U - Depression balance device for ophthalmologic equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an elevation balance device for an ophthalmologic apparatus capable of easily adjusting the amount of force without having to prepare a plurality of spring biasing devices having different amounts of force. [Structure] A spring bias for supporting a camera body 5 of a fundus camera on a movable base 2 so that the camera body 5 can be lifted and lowered, and a balance between the camera body 5 and a rotating arm 3 of the movable base 2 for lifting and lowering the camera body 5 against gravity. The device 6 is interposed. The spring urging device 6 has a urging force adjusting means 6a capable of increasing or decreasing the urging force according to the weight of an accessory such as the 35 mm camera 10 mounted on the camera body 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an elevation balance apparatus for an ophthalmologic apparatus that balances the weight of an optical apparatus body (movable part) that can be elevated or lowered in an ophthalmologic apparatus such as a fundus camera when performing an elevation operation.

[0002]

[Prior art]

 An example of an ophthalmologic apparatus equipped with this type of elevation / balance apparatus is a fundus camera as shown in FIG.

As shown in FIG. 4 (a), this fundus camera includes a fixed base 1, a movable base 2 mounted on the fixed base 1 so as to be movable back and forth, right and left, and a movable base 2. A rotating arm 3 mounted so as to be rotatable left and right, an arc-shaped guide bar 4 having a lower end fixed to the rotating arm 3, and a camera main body whose rear part is held by the arc-shaped guide bar 4 so as to be vertically movable ( It has an optical device body 5 and a spring urging device 6 (spring unit) interposed between the front part of the camera body 5 and the rear end of the rotating arm 3 as an elevation balance device.

As shown in FIG. 4 (b), the spring urging device 6 includes a bottomed first and second tubular body 7 and 8 whose open ends are slidably fitted to each other. , Has a spring 9 interposed between the cylindrical bodies 7 and 8. The upper end of the tubular body 7 is rotatably held by the camera body 5 by a pivot 7a, and the lower end of the tubular body 8 is rotatably held by the pivot arm 3 by a pivot 8a.

In such a fundus camera, accessories such as a 35 mm camera 10 or a polaroid camera or a TV camera (not shown) can be attached to the camera body 5 as needed and used.

[0006]

[Problems to be solved by the device]

 By the way, by attaching such an accessory to the camera body 5, the weight of the camera body 5 is increased, so that the weight balance of the camera body 5 by the spring urging device 6 changes. .

In order to solve this problem, conventionally, two types of spring urging devices 6 having different abilities are prepared, and each time an accessory is attached to or detached from the camera body 5, The spring urging device 6 was exchanged with one having a different ability to balance the elevation of the camera body 5.

However, in the method of replacing the spring urging device 6, the work of attaching and detaching the pivots 7a and 8a must be performed, and this work must be performed with the spring 9 compressed, which is very troublesome. There was a problem that it was costly.

There is also a problem that two types of spring urging devices 6 must be prepared and a storage place for the removed spring urging device must be secured.

Therefore, an object of the present invention is to provide an elevation balance device for an ophthalmologic apparatus capable of easily adjusting the amount of force without the need to prepare a plurality of spring urging devices having different amounts of force as in the prior art. To do.

[0011]

[Means for Solving the Problems]

 In order to achieve this object, the present invention supports an optical device body of an ophthalmologic apparatus so that the optical device body can be lifted up and down, and balances between the optical device body and the base with respect to the weight of the optical device body. In an elevation balance device for an ophthalmologic device having an urging device, the urging device has an urging force adjusting means capable of increasing or decreasing the urging force according to the weight of an accessory attached to the optical device body. The feature is that it is a down-and-up balance device.

Further, the urging device is configured such that the first and second cylinders whose open end sides are slidably fitted to each other and the first spring interposed between the end walls of the both cylinders. A rod which is movably held in one end wall of the two cylindrical bodies in the axial direction and is fixedly held in the end wall by a fixing means so as to be able to be released from the fixed state; and the one end wall and the rod tip. And a second spring interposed between the spring lock portion and the spring lock portion.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

First Embodiment FIG. 1 shows a first embodiment of the present invention.

As shown in FIG. 1 (a), this fundus camera includes a fixed base 1, a movable base 2 mounted on the fixed base 1 so as to be movable back and forth, right and left, and a movable base 2. A rotating arm 3 mounted so as to be rotatable left and right, an arc-shaped guide bar 4 having a lower end fixed to the rotating arm 3, and a camera main body whose rear part is held by the arc-shaped guide bar 4 so as to be vertically movable ( It has an optical device body 5 and a spring urging device 6 (spring unit) interposed between the front portion of the camera body 5 and the rear end portion of the rotating arm 3 as an elevation balance device.

As shown in FIG. 1 (b), the spring urging device 6 includes a bottomed first and second cylindrical body 7 and 8 whose open ends are slidably fitted to each other. , And has a first spring 9 interposed between the cylindrical bodies 7 and 8. The upper end of the cylindrical body 7 is rotatably held by the camera body 5 by the pivot 7a, and the lower end of the cylindrical body 8 is rotatably held by the pivot arm 3 by the pivot 8a. Reference numeral 5a is a camera mount of the camera body 5, 10 is a 35 mm camera mounted on the camera mount 5a, 8b is an end wall of the cylindrical body 8, and 8c is a tapered engagement recess provided on the end wall 8b.

Further, the spring biasing device 6 includes a shaft hole 7c provided in the center of the end wall 7b of the cylindrical body 7 and a rod 11 having one end 11a held in the shaft hole 7c so as to be movable in the axial direction. Have. The end wall 7b is formed with a shaft hole 7c and a screw hole 7d opening to the peripheral surface of the cylindrical body 7, and an engaging hole 11b is formed at one end 11a of the rod 11.

Moreover, the spring urging device 6 serves as the urging force adjusting means 6a and is screwed into the screw hole 7d and the shaft portion 12a is fitted into the engaging hole 11b of the rod 11 to fix the rod 11 to the end wall 7b. Which is interposed between the screw 12 (fixing means) and the spring locking flange (spring locking portion) 11d provided on the end wall 7b of the cylindrical body 7 and the other end 11c of the rod 11. It has two springs 13. The flange 11d has a tapered engagement portion 11e.

Next, the operation of the elevation balance device having such a configuration will be described.

In such a fundus camera, accessories such as a 35 mm camera 10 or a polaroid camera or a TV camera (not shown) can be attached to the camera body 5 as needed and used.

Now, in a state where the 35 mm camera 10 is not attached to the camera body 5, when the elevation of the camera body 5 is balanced by the first spring 9 shown in FIG. When the 35 mm camera 10 is mounted on the camera mount 5a of FIG. 1A as shown in FIG. 1A, the weight of the camera body 5 increases and the elevation balance of the camera body 5 changes.

In this case, the shaft 12a of the screw 12 is disengaged from the engaging hole 11b of the rod 11 by extracting the screw 12 from the screw hole 7d with a tool (not shown), and the engaging portion 11e of the rod 11 is removed. The spring force of the second spring 13 engages with the engaging recessed portion 8c of the tubular body 8 to exert the spring force of the spring 13 between the end walls 7b and 8b of the tubular bodies 7 and 8.

As a result, the spring forces of the springs 9 and 13 act simultaneously between the cylinders 7 and 8, and the spring urging force of the spring urging device 6, that is, the force (force amount) for extending the cylinders 9 and 13 together. Therefore, the elevation of the camera body 5 is balanced.

When the 35 mm camera 10 is removed from the camera body 5, the screw 12 is screwed into the screw hole 7d, and the shaft portion 12a of the screw 12 is fitted into the engaging hole 11b of the rod 11. It suffices that only the spring force of the spring 9 acts as an extension force between the cylindrical bodies 7 and 8. In this case, the screw 12 is attached by reducing the cylinders 7 and 8 together. Further, in order to prevent the engagement hole 11b of the rod 11 and the screw hole 7d from being displaced, a detent means or other detent means composed of a key groove and a key or the like between the one end 11a of the rod 11 and the shaft hole 7c. Shall be provided.

Second Embodiment FIG. 2 shows an example in which a contact position adjusting mechanism 20 for adjusting the contact height position of the rod 11 is provided on the end wall 8b of the cylindrical body 8 in the first embodiment. It is a thing.

In the present embodiment, a holding hole 8d is provided at the center of the end wall 8b, and one end of a screw shaft 21 coaxial with the tubular body 8 is inserted into the holding hole 8d and is provided in the middle part of the screw shaft 21. The flange 21a is brought into contact with the end wall 8b, and the flange 21a is rotatably held by a holding plate 23 fixed to the end wall 8b with a screw 22.

The screw shaft 21 is provided with a screw portion 21b and a worm screw portion 21c above and below the flange 21a, and a cylinder 24 is screwed into the screw portion 21b, and a key groove 24a of the cylinder 24 is inserted into the key groove 24a. A protrusion 23b provided on a cylindrical portion 23a integral with the holding plate 23 is engaged with the cylindrical plate 23a to prevent the cylindrical body 24 from rotating in the circumferential direction.

Further, the end wall 8 b is formed with a screw hole 25 that opens to the peripheral surface, and a worm screw 26 is rotatably inserted into the screw hole 25. Meshes with. The flange 26a of the worm screw 26 cannot be removed by a pressing plate 28 fixed to the cylindrical body 8 with a screw 27. A tapered engagement recess 24b is provided on the upper wall of the cylindrical body 24.

In such a configuration, when the shaft portion 12a of the screw 12 is removed from the engaging hole 11b of the rod 11, the engaging portion 11e of the rod 11 is engaged with the cylindrical body 24 by the spring force of the spring 13. It will engage with the recess 24b.

When the screw shaft 21 is rotated by rotating the worm screw 26 with a tool (not shown), the screw shaft 21 is rotated by the worm screw portion 21c and the worm screw 26, and the tubular body 24 is moved to the key groove 24a. Also, due to the action of the protrusion 23b, the screw portion 21b does not rotate but is moved upward or downward by the action of the screw portion 21b.

By this operation, when the engaging portion 11e of the rod 11 is engaged with the engaging recess 24b of the cylindrical body 24 by the spring force of the spring 13, the initial spring force of the spring 13 is adjusted, The urging force (force amount) of the urging device 6 is finely adjusted.

[Third Embodiment] FIG. 3 shows a third embodiment of the present invention, in which a gas spring 30 (biasing device) used in place of the spring biasing device 6 in the first embodiment is shown. The gas pressure adjusting circuit and the like are shown.

In this embodiment, when the 35 mm camera 10 shown in FIG. 1 is mounted on the camera mount 5 a of the camera body 5, the control circuit on the camera body 5 side is connected to the electric connection terminal 5 b provided on the camera mount 5 a. The gas pressure of the gas spring 30 is adjusted by utilizing the input of a connection signal indicating that the 35 mm camera 10 is connected to the camera mount 5a at 31.

That is, when the 35 mm camera 10 is connected to the camera mount 5 a and the control circuit 31 receives a connection signal from the electrical connection terminal 5 b of the camera mount 5 a, the control circuit 31 receives the gas pressure adjusting device 32 (biasing force adjusting device). By controlling the operation of the device), the pressure gas from the gas pressure supply source 33 is supplied to the gas spring 30 via the gas supply hose 34, and the spring force (force amount) of the gas spring 30 is increased.

On the other hand, when the 35 mm camera 10 is removed from the camera mount 5 a, the control circuit 31 turns off the connection signal from the electrical connection terminal 5 b of the camera mount 5 a, and thus controls the operation of the gas pressure adjusting device 32. Then, a part of the pressure gas from the gas spring 30 is discharged to the atmosphere through the gas discharge hose 35, and the spring force (force) of the gas spring 30 is reduced.

[0036]

【effect】

 Since the present invention is configured as described above, it is not necessary to prepare a plurality of spring urging devices having different abilities as in the prior art, and the abilities can be easily adjusted.

[Brief description of drawings]

FIG. 1 (a) is a schematic side view of an ophthalmologic apparatus equipped with a supine balance device according to a first embodiment of the present invention, and FIG. 1 (b) is a sectional view of the supine balance device of FIG. 1 (a).

FIG. 2 is a cross-sectional view of essential parts showing a second embodiment of the elevation balance device of the present invention.

FIG. 3 is an explanatory view showing a third embodiment of the elevation balance device of the present invention.

FIG. 4A is a schematic side view of an ophthalmologic apparatus including the conventional elevation / balance apparatus, and FIG. 4B is a sectional view of the elevation / balance apparatus of FIG.

[Explanation of symbols]

 2 ... Movable base 3 ... Rotating arm 5 ... Camera body 6 ... Spring urging device 7 ... First cylinder 8 ... Second cylinder 9 ... First spring 10 ... 35 mm camera (accessory) 11 ... Rod 11d ... Spring locking flange (spring locking portion) 12 ... Screw (fixing means) 13 ... Second spring 30 ... Gas spring (biasing device) 32 ... Gas pressure adjusting device (biasing force adjusting device)

Claims (2)

[Scope of utility model registration request] 1. An ophthalmology apparatus comprising an urging device for supporting an optical device body of an ophthalmologic apparatus so that the optical device body can be lifted up and down, and a balance between the optical device body and the base for lifting and lowering the optical device body against gravity. In a device elevation balance device, the biasing device has a biasing force adjusting means capable of increasing and decreasing the biasing force in accordance with the weight of an accessory attached to the optical device body. . 2. The urging device includes first and second cylinders whose open end sides are slidably fitted to each other, and a first spring interposed between end walls of the cylinders. A rod movably held in one end wall of the two tubular bodies in the axial direction and fixedly held in the end wall by a fixing means so as to be able to release the fixation; and a spring engagement member between the one end wall and the rod tip. The elevation balance device for an ophthalmologic apparatus according to claim 1, further comprising a second spring interposed between the stopper and the stopper.