JPS6315526B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horizontal compensation device for a measuring machine in which a horizontal compensation optical element is suspended and supported in a pendulum shape.

For example, level compensators are employed in measuring machines, such as automatic leveling instruments and transits, to automatically compensate for the tilt of the machine in its installed state, so that the line of sight is properly horizontally oriented. This horizontal compensator is configured to suspend a compensating optical element in a pendulum shape to obtain a horizontal direction based on the direction of gravity. Japanese Patent Publication No. 52-25104 shows a method for suspending this optical element, and this publication describes how to suspend the horizontal compensation optical element at a horizontally spaced position using two flexible synthetic resin tapes. A hanging invention is shown. In this case, the suspension tape requires a certain length to prevent creep due to load and to ensure the elongation necessary to absorb external impact force. However, in such a suspension method, external loads may cause torsional vibration in the optical element, and in order to prevent this, in the invention according to the above publication, the movement of the tape is restrained by contacting the side surface of the suspension tape. By providing the restraining member, the substantial hanging length of the tape is shortened and torsional rigidity is increased.

In general, when analyzing the vibration of an optical element in an optical compensator that has such a restraint member, two main vibrations occur: the main vibration in which the optical element swings back and forth in a pendulum shape using the restraint member as a fulcrum, and the optical element reciprocates around a vertical axis. torsional vibration resulting from the lateral displacement of the two suspension tapes in the restraint member;
There is a rolling vibration caused by a positional shift of one suspension tape in a restraining member. this house,
The main vibration is essential for horizontal compensation, but the torsional vibration causes an image shift of twice the vibration angle when a reflective optical element is used as the optical element. The invention disclosed in the above publication is effective in eliminating this torsional vibration. However, in recent years, prism optical elements have been used as optical elements in horizontal compensators, and in this case, the above-mentioned sideslip vibration and rolling vibration pose major problems.

As a measure to prevent such lateral shear vibrations and rolling vibrations, the angle at which the suspension tape that suspends the horizontal adaptive optical element is wrapped around the restraining member is increased.
It has been proposed to increase the frictional force of the suspension tape on the restraining member. However, this method has a large frictional force applied to the restraint member, so although it is effective in preventing sideslip vibration and rolling vibration,
If a leveling instrument, etc. is overturned or subjected to large vibrations, the restraining point on the restraining member of the suspension tape will shift, as in the past, and once this shift occurs, the frictional force will be large. for,
A major drawback is that the original purpose of the horizontal compensator cannot be achieved due to the phenomenon that the horizontal compensator does not return to its original reference position. In addition, the suspension tape for horizontal adaptive optics uses its own elasticity to prevent it from breaking even when an impact is applied to the optical element, and a certain length is required to increase its elasticity. , and the tape must also be able to slide in its length direction at the tape restraint point on the restraint member. However, in the above solution, the contact area of the tape with the restraint member is large, and the tension and frictional forces are also large, so that the tape cannot slide in its length direction at the restraint member contact point, and when an impact force is applied, the tape may be cut off.

The present invention aims to solve the above-mentioned problems in conventional horizontal compensation devices, and its structural feature is that horizontal compensation optical elements are arranged in a plurality of suspensions arranged at intervals in the horizontal direction. In a horizontal compensating device that is suspended by a string, and the hanging string is hung on a restraining member extending in the horizontal direction, a prevention means for preventing the hanging string from shifting laterally is provided near a contact portion between the hanging string and the restraining member. This is because it was established. Measures to prevent this include applying a resin material such as adhesive to the restraining member at the position where it contacts both sides in the width direction of the hanging string, providing a guide groove for the hanging string in the restraining member, and providing a guide groove for the hanging string in the restraining member. Possible configurations include a configuration in which a protrusion is provided for the suspension, a configuration in which the suspension string is lightly held down by an elastic member, etc. The present invention will be explained below based on examples.

1A and 1B show a first embodiment of the present invention, in which a horizontal compensator board 11 has a front protrusion 12 that functions as a restraining member. The horizontal adaptive optical element 10 is connected to the substrate 1 by a pair of suspension tapes 13.
It is suspended from 1. A metal fitting 14 for fixing one end of the suspension tape 13 is attached to the board 11 with a screw 15.
The suspension tape 13 is hung on the protrusion 12 at an angle θ with the substrate 11. In this example, in order to prevent the suspension tape 13 from moving laterally on the protrusion 12, the protrusion
2, the silicone rubber adhesive 16 is attached to the suspension tape 13
It is applied so as to slightly touch both sides 13a and 13b in the width direction. Since the suspension tape 13 suspends an optical element weighing several kilograms, when the tape itself stretches and moves in the direction of the arrow 17, the tape 13
Although it is possible to overcome the viscosity and adhesive holding force of the adhesive 16 and move, the lateral deviation in the directions of arrows 18 and 18' is
The viscosity and elasticity of the adhesive reliably prevents the tape from shifting laterally.

FIGS. 2A and 2B show a second embodiment of the present invention, in which an elastic member such as rubber is used to prevent the tape from shifting laterally. A U-shaped metal fitting 21 is attached to the restraining member portion 12 of the horizontal compensator with a screw 22, and a rubber 23 for compressing the suspension tape 13 is attached to the inner surface of this metal fitting 21.
In this embodiment, as in the previous example, the suspension tape 13 suspends a heavily loaded optical element in its longitudinal direction, so the moving force due to the elongation of the tape itself in the longitudinal direction is greater than the elastic frictional force of the rubber 23, and the optical element can be freely moved. Although it can be stretched, lateral displacement is prevented by the elastic frictional force of the rubber 23.

FIG. 3 shows a third embodiment of the present invention,
A groove 32 having approximately the same width as the suspension tape 13 is formed in the restraining member portion 12, and the suspension tape 13 is hung within this groove 32. The suspension tape 13 can be freely extended in the longitudinal direction by a suspended heavy-load optical element (not shown) due to the contact friction force caused by the contact between the edge of the groove 32 and the widthwise ends 13a, 13b of the tape. However, since it is restrained by the edge of the groove 32 in the lateral direction and cannot move, the tape is prevented from shifting laterally.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention, in which a protrusion 12 that functions as a restraining member is formed on a substrate 11 of the horizontal compensator, and a suspension tape 13 is hung thereon. It is being And board 1
1 has a protruding piece 41 fixed to it by a screw 42 to prevent the suspension tape 13 from shifting laterally.
In addition, the screw hole 43 of the protruding piece 41 is
It has a horizontal slot hole for adjustment.

As explained above, according to the present invention, there is provided a horizontal compensator that can prevent lateral displacement of the suspension tape while keeping the winding angle of the suspension tape as before, and thus does not cause lateral displacement vibration or rolling vibration. can be provided.

[Brief explanation of the drawing]

Fig. 1A is a side view showing one embodiment of the present invention, Fig. 1B is a front view thereof, Fig. 2A is a sectional view showing another embodiment of the invention, and Fig. 2B is a front view thereof. , 3rd
Figure A is a sectional view showing still another embodiment, Figure 3B
is a front view thereof, and FIG. 4 is a perspective view showing still another embodiment. 10... Horizontal adaptive optical element, 11... Substrate, 1
2...Protrusion portion, 13...Suspension tape, 16...Adhesive.

Claims (1)

[Scope of Claims] 1. A horizontal compensating optical element is suspended by a plurality of hanging strings spaced apart in the horizontal direction, and the hanging strings are connected to the horizontal compensating device hung on a restraining member extending in the horizontal direction. 1. A horizontal compensating device characterized in that the member is provided with a prevention means for preventing lateral displacement of the hanging string near a contact portion with the hanging string. 2. The horizontal compensating device according to claim 1, wherein the preventing means is an adhesive applied to the restraining member so as to substantially contact both sides of the suspension string in the width direction. 3 In claim 2, the adhesive is
A horizontal compensation device characterized by a silicone rubber adhesive. 4. The horizontal compensation device according to claim 1, wherein the prevention means is an elastic member that presses the suspension string. 5. The horizontal compensation device according to claim 1, wherein the prevention means is a guide groove formed in the restraint member. 6. The horizontal compensator according to claim 1, wherein the prevention means is a protruding member attached to a base plate of the compensator.