JPH0450562B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fine adjustment device for an optical instrument, which allows the main body of the optical instrument to be slightly moved forward, backward, left, right, and up and down by tilting and rotating operations of an operating lever.

An example of this type of optical instrument is a fundus camera. In this fundus camera, it is necessary to align the optical axis of the lens of the camera body, which is the main body of the optical instrument, with the optical axis of the pupil of the subject's eye. It is mounted on a base (table) so that it can be moved and adjusted. Moreover, this movement adjustment is performed by coarsely moving the camera body and then finely moving it.

By the way, as a device for finely adjusting the camera body in the front, back, left, right, and up and down directions, a slider is slidably placed on a base.
The camera body is attached to this slider so that it can move up and down, and an operating lever is attached to this slider so that it can be tilted in any direction and rotated around the axis. It is conceivable that the camera body can be slightly moved up and down by rotating the operating lever about the axis.

On the other hand, in a fundus camera, the fundus is photographed after adjusting the movement of the camera body as described above, and it is desirable that this photographing be performed quickly.

It turns out that in order to achieve this desire, it is sufficient to attach a switch for photographing to the operating lever. However, since the operating lever is operated by tilting forward, backward, left, right, and rotating around its axis, if the switch and the electronic shutter circuit on the slider side are simply connected with lead wires, the lead wires will be twisted and disconnected. Furthermore, if the switch and the electronic shutter circuit are connected via a brush or the like, there is a problem that durability is lacking.

Therefore, the present invention has been developed to prevent the wires from being twisted and disconnected even if the switch and the electronic circuit such as the electronic shutter circuit are connected by wiring such as lead wires, and to make the connection highly durable. It is an object of the present invention to provide a fine adjustment device for an optical instrument that allows fine movement of the main body of the optical instrument in the same manner as in the prior art.

In order to achieve this object, the present invention includes a slider mounted on a base so as to be slidable, an optical instrument main body mounted on the slider so as to be movable up and down, and an operating lever mounted on the slider so as to be tiltable and axially movable. In a fine adjustment device for an optical instrument, the device is mounted so as to be rotatable around the circumference, the slider is slightly moved by tilting the operating lever, and the optical instrument main body can be slightly moved up and down by the rotating operation of the operating lever. , a through hole that is open at both ends is bored in the device lever, a center shaft is inserted into the through hole so as to be relatively rotatable, and the center shaft is engaged with the slider so as to be non-rotatable and tiltable around the axis; A fine adjustment device for an optical instrument, in which the operation part of a switch attached to the upper end of the center shaft is arranged at the upper end of the through hole, and a part of the wiring between the switch and the electronic circuit on the slider side is arranged inside the center shaft. It is characterized by the following.

The present invention will be explained below based on the drawings.

In FIGS. 1 and 2, reference numeral 1 represents a fundus camera as an optical instrument, and reference numeral 2 represents an eyeball of a subject.

The fundus camera 1 has a base 3, on which two rails 4, 4 are fixed in parallel with an interval. A plurality of conical projections 5 are provided on the rails 4, 4 at equal pitches in the longitudinal direction.
Further, a slider 6 is slidably mounted on the base 3. A horizontal guide shaft 7 passing through the front side of the slider 6 is rotatably held by the slider 6, and wheels 8,
8 is fixed. The wheels 8, 8 are placed on the rails 4, 4, and the engagement holes 9, which are formed at the same pitch as the projections 5, are formed on the circumferential surface of the wheels 8, 8.
A plurality of 9's are open. Note that the slider 6 is adapted to be slidably displaced in the lateral direction with respect to the lateral guide shaft 7.

The inside of the slider 6 is hollow as shown in FIGS. 3 and 4. A guide hole 10 extending in the vertical direction and a holding cylinder 11 projecting into the slider 6 are formed in the front part of the upper wall 6a of the slider 6 (FIG. 3). A guide shaft 12 is fitted into the guide hole 10 so as to be vertically movable, and a female threaded cylinder 13 extending vertically is loosely inserted into the holding cylinder 11 . The middle part of this female threaded cylinder 13 is a radial ball bearing 1
4, it is rotatably supported by the holding cylinder 11. Further, an outer flange 15 is provided to protrude from the outer periphery of the upper end of the female threaded cylinder 13, and an inner flange 16 is provided to protrude from the upper inner peripheral surface of the holding cylinder 11. A bearing 17 is interposed, and a gear 18 is provided on the outer periphery of the lower end of the female threaded cylinder 13.
are integrated. And female thread cylinder 13
A male screw 19 is screwed into the inside, and an elevating table 20 is fixed to the upper end of the male screw 19 and the upper end of the guide shaft 12, and a support 21 is installed on the elevating table 20. A fundus camera body 25 serving as an optical instrument body is fixed to the upper end of the support column 21 . In the figure, 2
6 is a lens barrel of the fundus camera body 25, 27 is a cover that covers the lifting platform 20, and the cover 27 is a cover that covers the slider 6.
Fixed on top.

A lever insertion hole 28 is bored in the rear part of the upper wall 6a of the slider 6, and the upper end of a ball holder holding cylinder 29 is rotatably held in this lever insertion hole 28 via a bearing 30. An inner flange 31 is integrally provided at the upper end of the ball receiver holding tube 29, and a gear 32 is fixed to the lower end of the ball receiver holding tube 29 with screws 33. This gear 32 is gear 1
8 is engaged.

Further, a ball holder 34 is disposed within the ball holder holding cylinder 29. This ball receiver 34 includes a ring-shaped upper ball receiver member 35 having a tapered surface 35a that expands downward, and a tapered surface 36a that expands upward.
It is composed of a ring-shaped lower ball receiving member 36. A stepped portion 36b provided on the outer periphery of the lower ball bearing member 36 and a stepped portion 32a of the gear 32.
A spring 37 is interposed between the two. As a result, the lower ball receiving member 36 and the upper ball receiving member 35
are brought into elastic contact with each other, and the upper ball receiving member 35 is brought into elastic contact with the inner flange 31.

A pin insertion hole 38 is formed between the ball receiver members 35 and 36 as shown in FIG.
A base portion of a rotation regulating pin 39 is fitted into the base portion.
A portion of the flange 39a provided at the intermediate portion of the rotation regulating pin 39 is disposed between the ball receiver holding cylinder 29 and the lower ball receiver member 36, and is prevented from coming off from the hole 29a. The tip of the rotation regulating pin 39 projects into the ball receiver 34 . 40 is a ring-shaped cover that covers the peripheral edge of the bearing 30 and the ball receiver holding cylinder 29, and 41 is a screw that fixes the cover 40 to the slider 6.

The operating lever 42 extends from the center of the cover 40 to the ball holder 3.
The spherical portion 43 at the lower end of the operating lever 42 is rotatably held by the ball holder 34.
This spherical part 43 has a rotation regulating groove 44 extending vertically.
is formed, and the tip of the rotation restriction pin 39 is inserted into this rotation restriction groove 44 .

The operating lever 42 has a through hole 45 that is open at both ends, and a center shaft 46 is inserted into the through hole 45 . This center shaft 46 is rotatably held by the operating lever 42 via bearings 47 and 48. A spherical portion 49 located within the recess 43a of the spherical portion 43 is formed near the lower end of the center shaft 46, and a spherical portion 50 is formed at the lower end of the center shaft 46. Note that the centers of the spherical parts 43 and 49 coincide.

Reference numeral 51 denotes a plate disposed inside the slider 6, and the peripheral edge of the plate 51 is fixed to the lower part of the side wall of the slider 6. A cylindrical portion 50a extending into the recess 43a is integrally formed in the center of the plate 51, and a spherical portion 49 is inserted into the cylindrical portion 50a. Also, a rotation regulating pin 5 fixed to the cylindrical portion 50a
2 is inserted into a rotation regulating groove 53 formed in the spherical portion 49 and extending in the vertical direction.

A molded plate 5 is attached to the peripheral edge of the lower surface of the plate 51.
4 is fixed, and the plates 51, 5
A plate insertion space 55 is formed between the four. A peripheral portion of a friction fixing plate 56 is loosely fed into this plate insertion space 55. A protrusion 57 is provided in the center of the friction fixing plate 56 to protrude downward, and a ball receiving hole 58 is bored therein. This protrusion 57 protrudes downward from the hole 54a of the molding plate 54 and comes into contact with the base 3. A spherical portion 50 is provided in the ball receiving hole 58.
is inserted, and a low friction bearing material 59 is interposed between the peripheral edge of the friction fixing plate 56 and the plate 51. Further, a rotation restriction groove 60 extending in the vertical direction is opened in the ball receiving hole 58, and a rotation restriction pin 61 attached to the spherical portion 50 is inserted into the rotation restriction groove 60.

A cylindrical body 62 for holding a switch is disposed in the upper part of the operating lever 42 and is screwed onto the upper end of the center shaft 46 . A push button switch 65 is housed in a space 63 within the cylinder 62.

Moreover, the center shaft 46 has a hole 7 communicating with the space 63.
2 is formed. The lower end of this hole 72 opens laterally into the circumferential surface of the spherical portion at a position opposite to the rotation regulating groove 44 . Further, a notch 73 corresponding to the lower end opening of the hole 72 is formed in the upper part of the cylindrical portion 50a, and a flexible guide tube 74 is inserted into the lower end of the hole 72. Guide tube 74
The lower part of is disposed in the notch 73. A portion of the cord 75 as a wiring whose one end is connected to the push button switch 65 is disposed within the hole 72 and the tube 74, and a portion of the cord 75 disposed outside from the center shaft 46 is disposed along the plate 51. It is arranged as follows. Furthermore, the other end of the cord 75 is connected to a shutter circuit (not shown) that controls the shutter of the fundus camera body 25. The shutter circuit, which is such an electronic circuit, can be placed inside the slider 6 or inside the fundus camera body 25 on the slider 6 side.

Next, the operation of an optical instrument equipped with a fine adjustment device having such a configuration will be explained.

The following procedure is used to align the optical axis O of the lens of the fundus camera 1 with the optical axis of the eyeball 2 of the subject. That is, first, the slider 6 is directly moved roughly back and forth and left and right. Thereafter, when the operating lever 42 is tilted to the left or right in FIG. 4, the operating lever 42 is tilted to the left or right about the spherical portion 43 as indicated by arrows L and R. At this time, the spherical part 49 rotates within the cylindrical part 50a, and the rotation regulating pins 52, 61 and the rotation regulating groove 53,
60 is relatively displaced up and down. Moreover, the protrusion 57 of the friction fixing plate 56 is frictionally fixed on the base 3 by the weight of the slider 3, and a bearing material 59 is interposed between the friction fixing plate 56 and the plate 51. Therefore, when the operating lever 42 is tilted to the left or right as described above, the plate 51
and the friction fixing plate 56 are relatively displaced to the left or right,
The slider 6 moves slightly to the left or right.

On the other hand, when the operating lever 42 is rotated around the axis, this rotation is transmitted to the gear 18 via the rotation regulating pin 39, the ball bearing holding cylinder 29, and the gear 32, and the female screw cylinder 13 integrated with the gear 18 is rotated.
As a result, the male screw 19 for lifting and lowering is connected to the female screw tube 1.
3, the lifting platform 20 is raised and lowered, and the fundus camera body 25 attached to this via the support 21 is slightly moved up and down. Moreover,
Since the center shaft 46 is prevented from rotating in the circumferential direction by the rotation restriction pin 52 and the rotation restriction groove 53,
Even if the operating lever 42 is operated to rotate around the axis, the center shaft 46 does not rotate around the axis.

After aligning the optical axis O of the fundus camera 1 with the optical axis of the eyeball 2 of the subject's eye through such coarse and fine movement operations, the push button switch 65 protruding from the top of the operating lever 42 is pressed. When it is operated and turned on, the shutter of the fundus camera body 25 is activated, and the fundus of the eyeball 2 is photographed.

As explained above, the present invention includes a slider placed on a base so as to be slidable, an optical instrument main body mounted on the slider so as to be movable up and down, and an operating lever on the slider that can be tilted in left and right directions. The optical instrument is mounted so as to be freely rotatable around an axis, and the slider can be slightly moved by tilting the operating lever, and the optical instrument body can be slightly moved up and down by the rotating operation of the operating lever. In the adjustment device, a through hole that is open at both ends is bored in the device lever, a center shaft is inserted into the through hole so as to be relatively rotatable, and the center shaft is engaged with the slider so as to be non-rotatable and tiltable around an axis. The operating part of the switch mounted on the upper end of the center shaft is arranged at the upper end of the through hole, and part of the wiring between the switch and the electronic circuit on the slider side is arranged inside the center shaft. Since it is a fine adjustment device, even if the switch is connected to an electronic circuit such as an electronic shutter circuit using wiring such as a lead wire, the wiring will not be twisted and disconnected, and the connection can be made with high durability. Moreover, the fine movement of the optical instrument body can be performed in the same way as in the past. Moreover, the switch can be operated immediately after operating the optical instrument body.

[Brief explanation of drawings]

FIG. 1 is a partial plan view of a fundus camera equipped with a fine adjustment device according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a sectional view taken along the line - in FIG. 1, and FIG. FIG. 2 is a sectional view taken along the - line in FIG. 1; 1... fundus camera (optical instrument), 3... base,
6...Slider, 25...Fundus camera body (optical instrument body), 42...Operation lever, 45...Through hole, 46...Center shaft, 65...Push button switch, 75
...Code (wiring).

Claims (1)

[Claims] 1. A slider is slidably mounted on a base, and an optical instrument body is mounted on the slider so as to be movable up and down,
An operating lever is attached to the slider so as to be tiltable and rotatable around an axis, and the slider is slightly moved by tilting the operating lever, and the optical instrument body is slightly moved up and down by the rotating operation of the operating lever. In the fine adjustment device for an optical instrument, the device lever is provided with a through hole that is open at both ends, and a center shaft is inserted into the through hole so as to be relatively rotatable;
The center shaft is unrotatably but tiltably engaged with the slider around the axis, and an operating portion of a switch attached to the upper end of the center shaft is disposed at the upper end of the through hole;
A fine adjustment device for an optical instrument, characterized in that a part of the wiring between the switch and the electronic circuit on the slider side is disposed within the center shaft.