JP2600324Y2 - Fundus camera - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application] This invention is intended to observe and photograph the fundus of the subject's eye.
And the weight balance at the time of the elevation operation of the camera body to be used for shadow
And a fundus camera .

[0002]

2. Description of the Related Art As an ophthalmologic apparatus provided with this type of elevation balance device, there is, for example, a fundus camera as shown in FIG.

As shown in FIG. 4 (a), this fundus camera has 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 on the fixed base 1. A rotating arm 3 mounted 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 body (optical device) having a rear portion held by the arc-shaped guide bar 4 so as to be vertically movable. And a spring biasing device 6 (spring unit) interposed between the front portion of the camera body 5 and the rear end of the rotating arm 3 as a lifting balance device.

As shown in FIG. 4 (b), the spring biasing device 6 has first and second bottomed cylinders 7, 8 whose open ends are slidably fitted to each other. And a spring 9 interposed between the two cylindrical bodies 7 and 8. Note that the upper end of the cylinder 7 is a pivot 7a.
Thus, the lower end of the cylindrical body 8 is rotatably held by the rotating arm 3 by a pivot 8a.

[0005] In such a fundus camera,
35mm camera 10 or Polaroid camera or TV not shown
Accessories such as a camera can be attached to the camera body 5 as needed and used.

[0006]

By attaching such accessories to the camera body 5, the weight of the camera body 5 is changed by the spring biasing device 6 because the load on the camera body 5 increases. There is a problem of doing it.

In order to solve this problem, conventionally, two types of spring biasing devices 6 having different strengths are prepared, and each time an accessory is attached to or detached from the camera body 5, the spring biasing device 6 is provided. The biasing device 6 is replaced with a device having a different power to balance the elevation of the camera body 5.

However, in the method of replacing the spring biasing device 6, the work of attaching and detaching the pivots 7a and 8a must be performed, and this work must be performed in a state where the spring 9 is compressed. The problem is that
There was .

There are also problems that two types of spring biasing devices 6 must be prepared and that a storage space for the removed spring biasing device must be secured.

[0010] Accordingly, this invention does not need to be a conventional spring-loaded device, which is different from competent as of preparing a plurality, turtle
An attachment used to balance the weight when raising the body
It is an object of the present invention to provide a fundus camera capable of easily adjusting the power of a power device .

[0011]

In order to achieve this object, an invention according to claim 1 is directed to an arcuate guide bar extending vertically.
Is attached to the base, and the camera body is
Is held by the arc-shaped guide bar so that it can move up and down
And raise the camera body along the arc-shaped guide bar.
The upward / downward rose of the camera body with respect to gravity when moving down
A fundus camera equipped with a biasing device
The urging device is a fundus camera having an urging force adjusting means capable of increasing or decreasing the urging force according to the weight of an accessory attached to the camera body .

[0012] The invention of claim 2 provides the urging device.
But first, second open end side is slidably fitted to each other
And a first spring interposed between the end walls of the two cylindrical bodies, and a first spring held movably in the axial direction by one end wall of the two cylindrical bodies and fixed to the end walls by fixing means. It is characterized by having a rod fixedly held releasably, and a second spring interposed between the one end wall and a spring engaging portion at the tip of the rod.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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. 1A, the retinal camera has 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 rotating arm 3 mounted 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 body (optical device) having a rear portion held by the arc-shaped guide bar 4 so as to be vertically movable. And a spring biasing device 6 (spring unit) interposed between the front portion of the camera body 5 and the rear end of the rotating arm 3 as a lifting balance device.

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

The spring biasing device 6 is provided with an end wall 7 of the cylindrical body 7.
b, a shaft hole 7c provided at the center of the shaft b, and one end 1
1a has a rod 11 held movably in the axial direction. The end wall 7b is formed with a shaft hole 7c and a screw hole 7d opening on the peripheral surface of the cylinder 7, and the rod 11 is formed with an engagement hole 11b at one end 11a.

Further, the spring biasing device 6 serves as biasing force adjusting means 6a, which is screwed into the screw hole 7d and the shaft portion 12a is fitted into the engaging hole 11b of the rod 11, thereby fixing the rod 11 to the end wall 7b. Screw 12 (fixing means) and a 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 engaging portion 11e.

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

In such a fundus camera, an accessory 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, when the 35 mm camera 10 is not mounted on the camera body 5, when the camera body 5 is balanced in elevation by the first spring 9 shown in FIG. When the 35 mm camera 10 is mounted on the camera mount 5a as shown in FIG. 1A, the weight of the camera body 5 increases, and the vertical balance of the camera body 5 changes.

In this case, the screw 12 is pulled out from the screw hole 7d by a tool (not shown), whereby the shaft portion 12a of the screw 12 is removed from the engagement hole 11b of the rod 11, and the engagement portion 11e of the rod 11 is removed. The spring 13 is engaged with the engagement recess 8c of the cylinder 8 by the spring force of the second spring 13, and the spring force of the spring 13 acts between the end walls 7b, 8b of the cylinders 7, 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 (the amount of force) for extending the cylinders 9 and 13 is increased. As a result, the camera body 5 is balanced vertically.

When the 35 mm camera 10 is detached from the camera body 5, the screw 12 is screwed into the screw hole 7d, and the shaft 12a of the screw 12 is connected to the engaging hole 11 of the rod 11.
b, and only the spring force of the spring 9 is applied to the cylindrical bodies 7, 8
What is necessary is just to work as an extension force between them. In this case, the mounting of the screw 12 is performed by reducing the cylindrical bodies 7 and 8. Further, a rotation preventing means including a key groove and a key or another rotation preventing means between one end 11a of the rod 11 and the shaft hole 7c so that the engaging hole 11b of the rod 11 and the screw hole 7d do not shift. 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. Things.

In this embodiment, the holding hole 8 is formed at the center of the end wall 8b.
and a screw shaft 21 coaxial with the cylinder 8 is provided in the holding hole 8d.
Of the screw shaft 21, a flange 21a provided at an intermediate portion of the screw shaft 21 is brought into contact with the end wall 8b, and the end wall 8b
The flange 21a is rotatably held by a holding plate 23 fixed by screws 22.

The screw shaft 21 is provided with a screw portion 21b and a worm screw portion 21c above and below a flange 21a, respectively. A cylinder 24 is screwed to the screw portion 21b, and is held in a key groove 24a of the cylinder 24. A cylindrical portion 23a integral with the plate 23
Are engaged with each other to prevent the cylindrical body 24 from rotating in the circumferential direction.

A screw hole 25 is formed in the end wall 8b. The screw hole 25 is formed in the screw hole 25. The worm screw 26 is rotatably inserted into the screw hole 25. Is engaged. The flange 26a of the worm screw 26 is
The holding plate 28 fixed at 7 makes it impossible to come off. The upper wall of the cylindrical body 24 has a tapered engagement recess 2.
4b is provided.

In such a configuration, when the shaft portion 12a of the screw 12 is removed from the engagement hole 11b of the rod 11,
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.

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 cylinder 24 is turned into the key groove 24a.
And it is moved upward or downward by the action of the screw portion 21b without rotating by the action of the projection 23b.

By this operation, the engaging portion 11 of the rod 11
e is the engagement recess 24 of the cylindrical body 24 by the spring force of the spring 13.
In the state in which the spring 13 is engaged, the initial spring force of the spring 13 is adjusted, and the urging force (the amount of force) of the spring 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 and This shows a gas pressure adjusting circuit and the like.

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

That is, the control circuit 31 controls the 35 mm camera 10
When is connected to the camera mount 5a and receives a connection signal from the electrical connection terminal 5b of the camera mount 5a, the gas pressure adjusting device 32 (the urging force adjusting device) is operated and controlled, and Is supplied to the gas spring 30 via the gas supply hose 34 to increase the spring force (power) of the gas spring 30.

On the other hand, the control circuit 31
Is disconnected from the camera mount 5a, the connection signal from the electrical connection terminal 5b of the camera mount 5a is turned off. The gas is discharged to the atmosphere via the discharge hose 35, and the spring force (power) of the gas spring 30
Is to be reduced.

[0036]

The present invention is constructed as described above, so that it is not necessary to prepare a plurality of spring biasing devices having different powers as in the prior art, and the power can be easily adjusted.

[Brief description of the drawings]

FIG. 1A is a schematic side view of a fundus camera provided with an elevation balance device according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view of the elevation balance device of FIG.

FIG. 2 is a cross-sectional view of a principal part 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. 4 (a) shows an eye provided with this conventional elevation balance device.
FIG. 3B is a schematic side view of the bottom camera , and FIG. 4B is a cross-sectional view of the elevation balance device of FIG.

[Explanation of symbols]

 2 movable base 3 rotating arm 5 camera body 6 spring biasing 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)

(57) [Scope of request for utility model registration] An arcuate guide bar extending up and down is provided on a base.
The camera body is mounted along the arc-shaped guide bar
The arc-shaped guide bar is vertically movably held by the arc-shaped guide bar.
Move the camera body up and down along the arc-shaped guide bar
Balance of the camera body against gravity
The fundus camera cell biasing device is provided, the fundus camera the biasing device characterized by having a biasing force adjusting means capable increase or decrease the biasing force according to the weight of the accessory mounted on said camera body . 2. The urging device according to claim 1, wherein the first and second cylinders whose open ends are slidably fitted to each other and a first spring interposed between end walls of the cylinders. And a rod held axially movably on one end wall of the two cylindrical bodies and fixedly held on the end wall by fixing means so as to be releasable, and a spring member between the one end wall and the tip of the rod. The fundus camera according to claim 1, further comprising a second spring interposed between the stop portion and the stop portion.