JPH0594810U - Lens optical axis tilt adjustment mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] The amount of tilt of the lens holder is detected, and the optical axis of the lens is adjusted easily and accurately. [Structure] A lens holder 1 to which a lens holder 6 is attached is attached to a main body 2 by a shaft 3 so as to be rotatable in a direction of an arrow b. The lens holder 1 is attached to the lens holder 1 by an arrow b.
A tilt adjusting screw 5 is provided which rotates in the direction and is positioned at a position where the tilt of the optical axis of the lens is adjusted. In the main body 2,
Attach the distance measuring element 9. The tip of the distance measuring element 9 contacts the holder reference surface 1a of the lens holder 1 and causes the lens holder 1 to follow the inclination. As a result, the holder reference surface 1
The distance between a and the main body 2 is measured, and the amount of tilt of the lens holder 1 is obtained from the difference between the reference distance L measured in advance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens optical axis tilt adjusting mechanism capable of detecting the tilt of a lens optical axis by a simple means.

[0002]

[Prior Art]

 Generally, when performing a basic experiment in a laboratory or switching an intermediate lens in an optical measuring instrument such as an interferometer, or when using an optical detector, regularly adjust the optical axis, replace the detecting lens, and compare and evaluate the lenses. In some cases, it may be necessary to adjust the tilt of the optical axis. Conventionally, in order to adjust the tilt of the optical axis, for example, in Japanese Utility Model Laid-Open No. 56-58613, a holder holding a lens is provided so as to be tiltable in one direction, and the holder can be tilted by an adjusting screw. An optical axis adjusting mechanism has been proposed.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional mechanism, although the tilt of the optical axis can be adjusted, if the optical axis deviates from the initial setting, numerical data such as how much the optical axis was tilted and how much it was I couldn't get it. In addition, once an object that was set correctly was misaligned, the work could be a major task, such as removing the surrounding cover and installing an autocollimator in order to restore the original. Further, there is a problem that the adjustment may have to rely on a skilled worker.

The present invention has been made in view of the above-mentioned problems of the prior art. A mechanism for detecting the tilt of the lens holding body is provided so that the tilt of the lens holding body can be obtained numerically. It is an object of the present invention to provide an optical axis tilt adjusting mechanism for a lens, which can adjust the optical axis accurately.

[0005]

In order to achieve the above object, the present invention provides a lens having a lens holder for holding a lens, which is tiltable, and an adjusting means for tilting and positioning the lens holder. The optical axis tilt adjusting mechanism of the above is configured to include a detecting means for measuring the tilt amount of the lens holder, and the optical axis of the lens can be adjusted easily and accurately by obtaining the tilt amount of the lens holder as a numerical value. I chose

[0006]

Embodiment 1 FIG. 1 is a perspective view showing Embodiment 1 of an optical axis tilt adjusting mechanism for a lens according to the present invention, and FIG. 2 is a sectional view of FIG. 1 seen from the direction of arrow A. In the figure, reference numeral 1 denotes a lens holder, and the lower portion of the lens holder 1 is rotatably held by a main body 2 via a shaft 3 and is tiltable in the b direction about the shaft 3. Has been. An arm 4 is integrally formed on the back side of the upper part of the lens holder 1, and an inclination adjusting screw 5 is screwed onto the tip of the arm 4. The tip of the tilt adjusting screw 5 is provided so as to come into contact with the main body 2, and by rotating the screw 5, the lens holder 1 is rotated about the shaft 3.

A lens holder 6 for mounting a lens is attached to the center of the surface of the lens holder 1. The front surface of the lens holder 6 is formed as a lens holder reference surface 6a, and this lens holder reference surface 6a is formed on the back surface of the lens holder 1 formed as the holder reference surface 1a of the tilt detecting means of the lens holder 1. It is formed in parallel with. The lens holder 1, the main body 2 and the lens holder 6 are provided with holes 1b, 2a and 6b for passing light rays, respectively, and these holes 1b, 2a and 6b are arranged linearly. A distance gauge 9 such as a dial gauge for measuring the tilt amount of the lens holder is attached to the main body 2 which holds the lens holder 1, and the tip of the distance gauge 9 is attached to the holder reference surface 1a. The lens holder 1 is designed to follow the inclination of the lens holder 1 while being in contact with.

Next, the operation of the optical axis tilt adjusting mechanism of the lens configured as described above will be described. At the stage of installing the adjusting mechanism, the reference optical axis of the adjusting mechanism is set in advance by the master lens and the external optical axis adjuster, and the reference surface 1a of the holder in the distance measuring element 9 and the main body 2 at this time are set. The distance is set as the reference distance L and measured by the distance measuring element 9. In this state, when the tilt adjusting screw 5 screwed onto the tip of the arm 4 provided on the lens holder 1 is rotated in the direction of arrow a, the lens holder 1 rotates about the shaft 3 in the direction of arrow b. Then, the reference distance L changes. The changed distance is measured by the distance measuring element 9, and the tilt amount of the lens holder 1 with respect to the reference optical axis is detected from the difference between the measured value and the reference distance L. According to the present embodiment, it is possible to determine numerically how much the lens tilt is with respect to the preset reference optical axis, and the optical axis adjustment becomes easy.

[0009]

Second Embodiment FIG. 3 is a sectional view showing a second embodiment of the optical axis tilt adjusting mechanism for a lens according to the present invention. The present embodiment is configured so that the tilt of the lens holder 1 can be optically detected. The structure is the same as that of the first embodiment except the tilt detecting section, and the same parts are designated by the same reference numerals. The description is omitted. A mirror 10 for tilt detection is attached to the holder reference surface 1a of the lens holder 1 so that the light beam 11 projected on the mirror 10 can be reflected. The body 2 is provided with a passage hole 13 for projecting a light beam 11 from the outside onto the mirror 10 and guiding the reflected light 12 to the outside. A light beam generator (not shown) for generating and projecting the light beam 11 on the mirror 10 is always installed beside the adjusting mechanism, and an optical light receiving element for receiving the reflected light 12 ( (Not shown) is arranged in a predetermined range on the extension of the reflected light 12.

Next, the operation of the optical axis tilt adjusting mechanism of the lens configured as described above will be described. The reference optical axis of this adjusting mechanism is set by the same means as in the first embodiment, and the light receiving position on the optical light receiving element that receives the reflected light 12 by the mirror 10 at this time is measured in advance. In this state, when the tilt adjusting screw 5 provided on the arm 4 of the lens holder 1 is rotated in the direction of arrow a, the lens holder 1 is rotated around the shaft 3 in the direction of arrow b, and the mirror 10 and the lens holder 1 are rotated. The angle of reflection of the reflection 12 changes with the inclination of 1. At this time, by fixing the optical axis of the light beam 11 projected from the light beam generator to the mirror 10, the reflected light 12 has an angle twice the tilt angle of the lens holder 1 when the reference optical axis. Is reflected at the reflection angle added to the reflection angle. That is, the reflected light 12 is received by the optical light receiving element in a state in which the reflected light 12 is twice as inclined as the lens holder 1. The amount of tilt of the lens holder 1 with respect to the reference optical axis is detected by the difference between the measured value of the light receiving position of the reflected light 12 in the optical light receiving element and the measured value of the light receiving position of the reflected light 12 on the preset reference optical axis. According to the present embodiment, the amount of tilt of the lens holder 1 can be measured in contact, and by measuring the tilt of the lens holder 1 at twice the tilt amount, the amount of tilt of the lens holder 1 can be measured. Can be detected with high accuracy.

[0011]

Third Embodiment FIG. 4 is a sectional view showing a third embodiment of the optical axis tilt adjusting mechanism for a lens according to the present invention. In this embodiment, the optical axis tilt adjusting mechanism of the first embodiment is configured in the same manner as in the first embodiment except the tilt detecting portion of the lens holder 1, and the same parts are designated by the same reference numerals. The description is omitted. A light beam generator 15 is attached to the holder reference surface 1a of the lens holder 1. The light beam generator 15 is configured to project a light beam 16 perpendicular to the holder reference surface 1a of the lens holder 1 to the outside through a hole 17 provided in the main body 2. An optical light receiving element 18 for receiving the light beam 16 is installed on the extension of the light beam 16 outside the main body 2.

Next, the operation of the lens optical axis tilt adjusting mechanism having the above configuration will be described. The reference optical axis of the adjusting mechanism is set by the same means as in the first embodiment, and the light receiving position on the optical light receiving element 18 that has received the light beam 16 projected from the light beam generator 15 at this time is measured in advance. deep. In this state, when the tilt adjusting screw 5 is rotated in the direction of arrow a and the lens holder 1 is rotated about the axis 3 in the direction of arrow b and tilted, the light beam generator 15 projects the light on the optical light receiving element 18. The light ray 16 is also tilted, and the light receiving position of the light ray 16 changes. The tilt amount of the lens holder 1 is detected by the difference between the measured values of the light receiving position and the light receiving position on the reference optical axis. According to this embodiment, the light beam generator 15 is attached to the holding body reference surface 1a of the lens holding body 1 so as to emit the light ray 16 directly from the lens holding body 1. In addition, since the flatness of the holder reference surface 1a does not affect the measurement value of the optical light receiving element 18, the tilt amount of the lens holder 1 can be measured more accurately, so that the optical axis of higher accuracy can be obtained. Adjustment is possible.

In each of the above-described embodiments, the lens holder 1 is configured to rotate only in one direction (direction of arrow b) and the optical axis in that direction can be adjusted. The present invention is not limited to this, and the lens holder 1 of each embodiment may be provided with a plurality of mechanisms similar to those of the embodiments so that the optical axes can be adjusted in a plurality of directions.

[0014]

[Effect of the device]

 As described above, according to the optical axis tilt adjusting mechanism of the present invention, the tilt amount of the lens holding body that holds the lens with respect to the reference optical axis is detected by the detecting means, and the tilt is known as a numerical value. This makes it possible to easily and accurately adjust the tilt of the lens optical axis.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of an optical axis tilt adjusting mechanism for a lens according to the present invention.

FIG. 2 is a cross-sectional view as seen from the direction of arrow A in FIG.

FIG. 3 is a sectional view showing a second embodiment of an optical axis tilt adjusting mechanism for a lens according to the present invention.

FIG. 4 is a sectional view showing Embodiment 3 of the optical axis tilt adjusting mechanism of the lens according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens holder 2 Main body 3 Axis 5 Inclination adjusting screw 9 Distance measuring element 10 Mirror 11, 16 Light beam 12 Reflected light 15 Light beam generator 18 Optical light receiving element

Claims (1)

[Scope of utility model registration request] 1. An optical axis tilt adjusting mechanism for a lens, wherein a lens holding body for holding a lens is tiltably provided, and an adjusting means for tilting and positioning the lens holding body is provided. A mechanism for adjusting the optical axis tilt of the lens, which is characterized by being provided.