JPH0133044Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a fine adjustment device for an optical instrument that allows the main body of the optical instrument to be slightly moved in the horizontal direction (back and forth and left and right) by tilting an operating lever. It is something.

Prior Art 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 eye of the subject, so the camera body is mounted on a base so that it can be moved and adjusted. There is. Moreover, this movement adjustment is performed by coarsely moving the camera body and then finely moving it.

Conventionally, such a movement adjustment device for a fundus camera consists of a slider equipped with a camera body that is slidably mounted on a base, an operating lever that is attached to the slider so that it can be tilted in any direction, and a slider that includes a camera body that is slidably mounted on the slider. A contact surface that comes into contact with the top surface of the base is provided at the lower end, and by tilting the operating lever, the slider can be moved in any direction on the base using the frictional force between the top surface of the base and the contact surface. There is something that makes it move slightly.

In this fundus camera, the movement of the camera body can be adjusted by coarsely moving the slider directly in the horizontal direction to roughly align the position, and then tilting the control lever to slightly move the camera body in the horizontal direction.

By the way, during coarse movement of the slider mentioned above, the contact surface and the top surface of the base move relative to each other, so
The smaller the coefficient of friction between the contact surface and the upper surface of the base, the better. On the other hand, it is necessary to reliably perform fine adjustment of the slider by the tilting operation of the operating lever, and for this purpose, the higher the coefficient of friction between the contact surface and the upper surface of the base, the better.

Therefore, it is desirable to be able to satisfy both of these requirements at the same time, but since the friction coefficient of the contact surface of the aforementioned operating lever is uniform, it has been impossible to satisfy both requirements at the same time.

Purpose of the invention Therefore, this invention can reduce the coefficient of friction between the contact surface and the top surface on the base side during coarse movement of the slider, and reduce the coefficient of friction between the contact surface and the top surface on the base side when adjusting the fine movement of the slider by tilting the operating lever. It is an object of the present invention to provide a fine adjustment device for an optical instrument that can increase the coefficient of friction between the two.

Structure of the invention In order to achieve this purpose, this invention sets the friction coefficient of one part of the spherical contact surface provided on the operating lever to be larger than the friction coefficient of the other part, so that the slider cannot be operated during coarse movement. By tilting the lever, the part of the contact surface with low frictional resistance comes into contact with the top surface of the base side, and when adjusting the slider's fine movement by tilting the lever, the part of the contact surface with high frictional resistance comes into contact with the top surface of the base side. The present invention is characterized in that it is a fine adjustment device for an optical instrument.

Example This 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.

A column 10 is held at the front of the slider 6 so as to be movable up and down, and a camera body 11 as an optical instrument body is attached to the upper end of the column 10.

Further, the slider 6 is formed with a chamber 12 that opens at the lower end, and this chamber 12 is closed by a bottom plate 13 fixed to the lower end of the slider 6. A stepped hole 14 is bored in the rear portion of the bottom plate 13, and a lower end portion of a lever support cylinder 15 is fitted and fixed into the stepped hole 14. The upper end of this lever support cylinder 15 passes through an insertion hole 16 formed in the upper wall 6a of the slider 6 and projects upward. A cylindrical vertical movement operating handle 17 is rotatably held on the outer periphery of the upper end of this lever support cylinder 15 via a bearing 18, and is located in the chamber 12 on the outer periphery of the lower end of the vertical movement operating handle 17. A pulley 19 is provided integrally. This pulley 19 is linked via a belt 20 to a pulley (not shown) that is integrated with a threaded cylinder (not shown). This threaded cylinder is provided parallel to the column 10 and rotatably held by the slider 6, and a male screw fixed to the column 10 is screwed into this threaded cylinder. By this,
By rotating the vertical movement operation handle 17, the column 10 and the camera body 11 can be slightly moved in the vertical direction.

Inside the lever support cylinder 15, there are provided a tapered hole 15a whose diameter gradually decreases toward the bottom, and a small diameter hole 15b and a large diameter hole 15c successively connected to the lower end of the taper hole 15a. It is being A ball receiving ring 21 is fitted into the upper end of the small diameter hole 15b, and a ball push ring 22 as a ball receiver is screwed into the upper end of the large diameter hole 15c. 2
2, a spherical portion 24 provided at the intermediate portion of a joystick lever 23 serving as an operating lever is rotatably held. The upper part of the joystate lever 23 projects upward from the operating handle 17, and the lower end thereof is located within the large diameter hole 15c. Moreover, a hemispherical contact portion 25 is integrally provided at the lower end of this joy states lever 23, and this contact portion 25 has a hemispherical contact surface 2.
6 is provided. As shown in FIG. 4, this contact surface 26 consists of a rough surface portion 26a provided on the center side and a smooth surface portion 26b provided on the peripheral edge, and is in contact with the upper surface of the sliding plate 27 fixed on the base 3.

Next, the operation of the optical instrument 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 roughly moved directly back and forth and left and right to roughly align the position. At this time, the joy states lever 23 is tilted, and the sliding surface 26b of the contact portion 25 provided at the lower end of the lever comes into contact with the sliding plate 27, so that the contact surface 26 and the upper surface of the sliding plate 27, which is the upper surface on the base side. The coefficient of friction between the two is small. As a result, when coarsely moving the slider 6,
Since no large frictional force is generated between the contact surface 26 and the sliding plate 27, the slider 6 can be roughly moved with a light force.

After this coarse movement operation, Joy States Clever 2
3 is made to stand upright as shown in FIG. In this state, since the coefficient of friction between the contact surface 26 and the sliding plate 27 is large, a large frictional force is generated between them. Therefore, Joy States Clever 2
By tilting the slider 3 back and forth, left and right, the slider 6 can be slightly moved back and forth and left and right. On the other hand, by rotating the vertical movement operation handle 17, the camera body 11 is slightly moved in the vertical direction. Through such fine movement operations, the optical axis O of the fundus camera 1 can be adjusted.
By aligning the optical axis of the eyeball 2 of the subject's eye, adjustment of the movement of the fundus camera 1 is completed.

In the embodiments described above, the rough surface portion 26a is machined on the center side of the contact surface 26 to make the friction coefficient at the center larger than the friction coefficient at the periphery. , but is not necessarily limited to this. For example, as shown in FIG. 5, a circular recess 28 is formed on the center side of the lower surface of the contact portion 25, and a rubber 29 is attached to the circular recess 28, thereby forming a circular recess 28 on the center side of the contact surface 26'. The friction coefficient may be larger than that of the peripheral portion. In this case, the surface 29 of the rubber 29
a and the peripheral smooth surface portion 26b constitute a contact surface 26'.

Further, in the embodiment described above, the friction coefficient of the contact surface 26 is set in two stages, but it may be set in three or more stages, or it may be set so as to change continuously. .

Furthermore, although the friction coefficient at the center of the contact surface 26 is set to be larger than that at the periphery, depending on the nature of the device, a rough surface portion with a large friction coefficient may be provided in a portion of the contact surface 26 that is not near the center. You can also do it. An example of this case is, for example, when the joy stay lever 23 has to be installed at an angle with respect to the slider 6 due to design considerations.

Effects of the invention As explained above, this invention, by setting the friction coefficient of one part of the spherical contact surface provided on the operating lever to be larger than the friction coefficient of the other parts, allows the operating lever to move during coarse movement of the slider. The part of the contact surface with low frictional resistance is brought into contact with the top surface of the base side by tilting the control lever, and the part of the contact surface with high frictional resistance is brought into contact with the top surface of the base side when adjusting fine movement of the slider by tilting the control lever. This fine-adjustment device for optical instruments reduces the coefficient of friction between the contact surface and the upper surface of the base during coarse movement of the slider, allowing smooth coarse movement of the slider with a light force, and making it easier to move the operating lever. When adjusting the fine movement of the slider by tilting operation, the coefficient of friction between the contact surface and the upper surface on the base side is increased, so that the fine movement of the slider can be performed reliably and precisely.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the relationship between the fundus camera equipped with the fine adjustment device according to this invention and the subject's eye;
The figure is a side view of Fig. 1, Fig. 3 is a sectional view of the main part of this invention, Fig. 4 is a bottom view of the contact part of the joy states lever shown in Fig. 3, and Fig. 5 is another example of this invention. FIG. 2 is a cross-sectional view of main parts showing an example. 1... Fundus camera (optical instrument), 3... Base, 6
...Slider, 11...Camera body (optical instrument body),
23... Joy states lever (operation lever),
25... Contact portion, 26... Contact surface, 26a... Rough surface portion,
26b...Smooth surface part, 27...Sliding plate, 28...Circular recessed part, 29...Rubber.

Claims (1)

[Claims for Utility Model Registration] A slider including an optical instrument body is slidably mounted on a base, an operating lever is attached to the slider so as to be tiltable in any direction, and the lower end of the operating lever is attached to the By providing a spherical contact surface that comes into contact with the top surface of the base and tilting the operating lever, the slider can be moved arbitrarily on the base using the frictional force between the base side top surface and the contact surface. What is claimed is: 1. A fine adjustment device for an optical instrument, wherein a friction coefficient of a portion of the contact surface is made larger than a friction coefficient of another portion of the contact surface.