JPH0626539B2 - Fine adjustment mechanism of optical device - Google Patents

Description

The present invention relates to a fine adjustment mechanism for an optical device, and more specifically, an optical device such as a fundus camera is mounted on a movable base, and the movable base is used as a base of the optical device. The present invention relates to a fine adjustment mechanism of an optical device that can be finely moved with respect to a table.

[Prior Art] Conventionally, such a fine adjustment mechanism is described in US Pat. No. 4,365,521. In this device, when mounting the optical device on the base, a so-called Goldman type system is adopted, and two positions in front of the moving base on which the optical device is placed and an operation member connected to the moving base are used. The optical device is supported on the base by the three points of the spherical foot. When slightly moving the optical device with respect to the base, the movable member of the optical device is horizontally moved by rotating the operating member and rotating the spherical foot with respect to the base.

[Problems to be Solved by the Invention] In such a conventional device, the spherical foot portion of the operating member is in point contact with the friction plate of the base, and the friction force with the friction plate is the weight of the optical device. However, there is a problem in durability such as abrasion, and it is necessary to strictly examine the material.
Further, when the operation member is operated and the optical device is shaken to the left or right during the minute movement, the center of gravity of the optical device is set to 3 of the above-mentioned three points of support.
In some cases, it may come out of the triangle connecting the points, and the load applied to the spherical foot portion changes (becomes lighter). Therefore, there is a problem that the frictional force is insufficient and slipping occurs.

Therefore, the present invention has been made to solve the above-mentioned conventional drawbacks, and provides a fine adjustment mechanism for an optical device that can stably move the optical device in the left-right and front-rear directions when the optical device slightly moves. The purpose is to do.

[Means for Solving the Problems] The present invention has been made to solve the above problems, and includes an optical device, a movable base that can move horizontally with respect to a base, and a predetermined point. A fine adjustment of an optical device which has an operating member rotatable in all directions in the center, and moves the movable table with respect to the base by the interaction between the operating member and the base generated by the rotation of the operating member. In the mechanism, between the lower end of the operating member and the base, the lower end of the operating member is accommodated and engaged, and a friction plate having a substantially concave shape is interposed which is in contact with the base by the flat surface of the lower surface thereof. It was adopted.

[Operation] With the above configuration, the friction plate is interposed between the lower end of the operation member and the base, and during the horizontal fine adjustment of the moving table, the friction force between the friction plate and the base causes the friction plate to move between the lower end of the operation member and the base. The positional relationship is fixed, and the driving force for slightly moving the movable table with respect to the base is generated by the rotation of the operation member.

[Embodiment] The present invention will be described in detail below based on an embodiment shown in the drawings.

An optical device, for example a slit lamp device, is shown in FIGS. 1 and 2. A reference numeral 10 in FIG. 1 is a microscope, which is mounted on a horizontal moving table 11 which can move horizontally with respect to a substrate 12. An illumination device 13 for performing slit illumination and laser irradiation is mounted on the horizontal moving table 11 so as to be rotatable with respect to the microscope 10 about an axis A, and the illumination light flux obtained from the illumination device is The lesioned area of the eye 19 of the subject who is seated with his / her face resting on the chin stand 17 and the knee pad 18 is irradiated via the scan mirror 16. The reflected light from the subject's eye 19 enters the microscope through the objective lens system 20 and is observed by the examiner 21 or photographed by a camera (a camera is not shown).

The horizontal moving table 11 moves via a plurality of rollers 14a along two rails 14 (one rail is shown in FIG. 2) extending in the front-back direction (X direction) with respect to the eye 19 to be inspected. It is configured to be able to. Further, the front-rear rail 14 can slide along the left-right direction (Y direction) rail 15 fixed to the base via a plurality of rollers 15a. The microscope 10 and the illuminating device 13 placed on the substrate 12 are X, Y
You can move in any direction.

In this way, the slit lamp can mainly perform a large movement (coarse movement) such as when changing the object to be inspected from the left eye to the right eye. On the other hand, it is necessary to perform front-back, left-right direction adjustment and focusing around the cornea, iris, crystalline lens, etc. For this purpose, an operation member 25 composed of a joystick or the like is provided on the horizontal movement table, which allows fine adjustment. Is done.

The detailed structure of the operating member 25 is shown in FIG. The operating member 25 has a hollow cylindrical handle 26, and an inner lever 27 is housed in the hollow portion. A cover 35 is fixed to an upper portion of the inner lever 27, and an operation lever 36 projects from an opening 35 a of the cover 35. Inside the inner lever 27, the operation lever 3
A detection circuit 36 'for detecting the operation amount of 6 and a cord 37 for guiding an electric signal are stored.

The lower portion of the handle 26 has a ring 31, a cylindrical portion 32,
It is connected to a well-known cruciform joint (universal joint) composed of the shaft pin 30a and the like, and the operating member 25 is moved in the X and Y directions about the shaft pin 30a and a shaft pin (not shown) arranged perpendicularly thereto. It can be rotated.

Further, the handle 26 can be rotated, and the rotation is transmitted via the ring 31 and the cylindrical portion 32 to the idle gear 38 meshing with the cylindrical portion 32. This idle gear 3
8 is a vertical movement base 40 (FIG. 1) via a gear not shown.
The vertical movement base 40 and the microscope 10 and the illumination mechanism 13 mounted thereon can be vertically moved by rotating the handle 26.

A sleeve 40 is fixed to the horizontal moving table 11, and a sphere 41 is housed inside the sleeve. The sphere 41 has a hollowed central portion through which the inner lever 27 passes. As shown in detail in FIG. 3, the inner lever 27
A lower foot portion 42 having a flat surface 42a with an infinite radius of curvature is screwed to the lower portion of the. The lower leg portion 42 is housed in a friction dish 43 that frictionally engages with a friction plate 50 provided on the surface of the base plate 12. The surface 43a of the friction tray 43 that contacts the lower foot portion 42 has a special cam so that the distance L between the center O of the spherical body 41 and the contact point is always constant even if the operating lever 25 is displaced by an arbitrary angle θ. Forming a surface. It may also be practically constructed as a spherical surface of radius R.

A spring 44 is interposed between the spherical body 41 and the lower leg portion 42, and presses the spherical body 41 against the sleeve 40, and at the same time, the reaction force presses the friction plate 43 against the friction plate 50.
The sphere 41 and the inner lever 27 can move up and down in the axial direction within a restricted range by the pin 41a fixed to the sphere 41 being fitted into the vertical groove 27a formed in the inner lever 27. Is. The head of the pin 41a is the second
As shown in the figure, the vertical groove 4 formed in the sleeve 40.
0a, which prevents the inner lever 27 from rotating when the handle 26 is rotated.

Further, when the optical device is a laser coagulation device or the like, a braking device is provided which is adjusted by the lock tension adjusting knob 60 in order to apply braking to the rotational movement of the operating member. The adjustment knob 60 has a cam barrel 62 fixed to a rotatable ring 61. As shown in FIG. 5, an oblique cam groove 63 is formed in the cam cylinder 62, and a pin 65 with a roller 65 a fitted in a drive cylinder 64 is fitted into the cam groove 63. To do. The drive cylinder 64 is vertically guided by a guide cylinder 66 fixed to the sleeve 40, and a moving shaft 68 equipped with a limiting screw 67 moves at the center thereof. A friction piece 69 that comes into contact with the friction plate 50 of the base plate 12 is attached to the lower end of the moving shaft 68, and the moving shaft 68 is connected to the drive cylinder 6.
It is urged downward by a spring 70 in the unit 4.

Next, the operation of the fine adjustment mechanism and the braking device for the operating member in such a configuration will be described.

First, in the case of making a large movement (coarse movement) with respect to the eye 19 to be inspected, such as when changing the left eye to the right eye, an optical device such as a slit lamp is illustrated in FIG. 2 and FIG. 3 (A). As described above, the operation member 25 is placed upright and the entire optical device is moved. At this time, the friction plate 43 is moved by applying a force exceeding the frictional force between the friction plate 43 and the base friction plate 50. As a result, the movable table 11 moves along with the optical device to the rails 14,
5, the substrate 12 can be moved in the front-back and left-right directions (X, Y) depending on the frictional force.

Next, when finely moving the optical device during fine adjustment or focusing, the operating member 25 is rotated by θ as shown in FIG. 3 (B). By this rotation, the inner lever 27 of the operation member rotates around the spherical body 41. Friction plate 4
Since 3 is fixed by friction to the friction plate 50 of the base, the horizontal moving table 11 on which the optical device is mounted moves horizontally by a small amount S as shown in FIG. Since the horizontal moving table 11 is supported by the rail mechanisms 14 and 15, the height H of the spherical body 41 from the base is always constant. In the contact surface 43a of the friction plate 43, the distances L and L'between the axis C passing through the center of the spherical body 41 and the flat surface 42a of the lower leg 42 are substantially constant even if the operating member 25 rotates. It is formed on a spherical surface having such a curvature R. Further, the side surface of the lower leg portion 42 is also spherical, and its diameter φD is formed so that the lower leg portion 42 always fits in the friction dish without play even when the operating member 25 is rotated.

In this embodiment, the sphere 41 and the inner lever 27 are not directly connected to each other, but the lower leg portion 42 is pushed by the spring 44 and at the same time, the sphere 41 is pressed against the sleeve 40 by the reaction force thereof. This increases the frictional force between the substrate 12 and the substrate 12, and prevents the optical device from rolling due to an inadvertent external force even when the user releases the operating member 25.

In the embodiment described above, the contact surface 43a of the friction plate 43 is
Is a spherical surface having a curvature R, and the contact surface 4 of the lower foot portion 42
2a is a flat surface, on the contrary, the contact surface 42a has a curvature R
The contact surface 43a may be flat on the spherical surface.

Next, the operation of the braking device will be described. First, when the braking device is free, it is in the state shown in FIG. 4 (A), and the pin 65 planted in the drive cylinder is lifted by the cam barrel 62 to the position shown in A1 of FIG. On the other hand, the moving shaft 68 urged downward by the spring 70 is
The drive barrel 64 is supported by the limiting screw 67 and is lifted together with the drive barrel. As a result, a gap is created between the friction plate 50 and the friction piece 69, and the horizontal movement table is thus free to move.

Next, by rotating the adjustment knob 60, as shown in FIG. 5, the cam barrel 62 is rotated in the direction of the arrow, and the pin 65 engaged with the cam groove 63 comes to the position A2 to drive the barrel 64.
Is pushed down, the friction piece 69 starts to come into contact with the friction plate 50, as shown in FIG. 4 (B). further,
When the cam barrel 62 is rotated, the drive barrel 64 is pushed down, and the spring 70 pushes the moving shaft 68 to cause the friction plate 5 to move.
A braking force is generated between 0 and 0. This braking force increases in proportion to the depression, and can be arbitrarily adjusted until the locked state shown in FIG. 4 (C) is reached.

When the adjustment knob 60 is further rotated and the cam barrel 62 is rotated,
The stepped portion inside the drive cylinder directly presses the moving shaft 68 to bring it into a locked state. This state is shown in FIG. 4 (C), and the pin 65 is at the position A3 in FIG. In addition,
The guide cylinder 66 is fixed to the sleeve 40, and is fixed to the horizontal moving table 11 to be advantageous in assembly. Further, when the drive cylinder 64 is rotated, the pin 65 is rotated by the groove 6 of the guide cylinder 66.
It is prevented by engaging 6a. Further, since the pin 65 is provided with the roller 65a, the engaging operation with the cam groove 63 becomes smooth.

In the above-described embodiment, the cam groove 63 of the cam barrel 62 is a continuous surface, but a step may be provided to increase the braking force stepwise.

Such a braking device has a structure independent of the operation mechanism of the operation member, and the adjustment knob is arranged coaxially with the operation member in order to improve operability. This braking device is suitably used for braking and locking an optical device such as a laser coagulation device, which is likely to burn not only a lesion but also a normal part if the optical device is moved inadvertently.

EFFECTS OF THE INVENTION As described above, in the present invention, the lower end of the operating member is housed and engaged between the lower end of the operating member and the base, and the lower surface of the operating member contacts the base. , The friction plate between the friction plate and the base is used to fix the positional relationship between the lower end of the operation member and the base, and the rotation of the operation member is made by interposing a friction plate having a substantially concave shape. By this, a driving force for slightly moving the movable table with respect to the base is generated.

That is, since the friction plate interposed between the lower end of the operating member and the base is designed to come into surface contact with the base due to the flat surface, according to the present invention, the friction plate and the friction plate are adjusted during horizontal fine adjustment of the moving base. The positional relationship between the lower end of the operating member and the base is fixed by the frictional force between the bases, and a slight operating force is applied to the operating member to generate a driving force that causes the moving base to make a minute movement with respect to the base. On the other hand, since the friction plate and the base are not in point contact with each other during the horizontal coarse movement of the moving table, smooth horizontal coarse movement is possible, and the fine adjustment of the optical device can be moved stably back and forth and left and right. There is an excellent effect that can be.

[Brief description of drawings]

FIG. 1 is a side view showing the external appearance of the device of the present invention, FIG. 2 is a cross-sectional view showing the structure of the main part centering on the operating member, and FIGS. 3 (A) and 3 (B) when operating the operating member. 4 (A) to 4 (C) are sectional views showing a free state, a braking state, and a stopped state of the operating member by adjusting the lock tension adjusting knob, and FIG. It is explanatory drawing which shows the movement of the pin of FIG. 11 ... Horizontal moving base, 12 ... Substrate 25 ... Operating member, 43 ... Friction member 60 ... Lock tension adjusting knob

Claims (5)

[Claims] 1. An optical device is mounted on the base, which has a movable base horizontally movable with respect to a base, and an operating member rotatable in all directions around a predetermined point. In a fine adjustment mechanism of an optical device that moves a movable table with respect to a base by an interaction between the operation member and the base generated by motion, a lower end of the operation member is provided between a lower end of the operation member and the base. Through a friction plate having a substantially concave shape, which is in contact with the base due to the flat surface of the lower surface of the friction plate, and the friction between the friction plate and the base during fine adjustment of the horizontal movement of the moving table. The positional relationship between the lower end of the operating member and the base is fixed by the force, and the rotation of the operating member generates a driving force for slightly moving the moving base with respect to the base. Adjustment mechanism. 2. The contact surface between the operating member and the friction plate is formed so that the height of the turning point from the base is kept constant when the operating member is operated. The fine adjustment mechanism of the optical device according to item 1. 3. A contact surface of the friction plate with the operating member is a spherical surface having a predetermined curvature, and a contact surface of the operating member with the friction plate is a flat surface. Fine adjustment mechanism of the optical device described. 4. A contact surface of the operating member with the friction plate is a spherical surface having a predetermined curvature, and a contact surface of the friction plate with the operating member is a flat surface. Fine adjustment mechanism of the optical device described. 5. The optical device according to any one of claims 1 to 4, wherein an elastic member for applying a substantially constant load is provided on a friction dish that is in flat contact with the base. Fine adjustment mechanism.