JPH08327913A - Angle detector - Google Patents

Abstract

PURPOSE: To obtain an detector which is capable of suppressing the deformation of a disk in spite of the occurrence of deformation at a revolving shaft and does not affect angle detection even when the angle detection is affected by its own weight of the disk by supporting the disk by means of plural supporting rods which are erected at the revolving shaft and have elasticity. CONSTITUTION: This angle detector is attached to an altitude shaft 1, which is a turning shaft, by fixing the rear surface of a tape carrier 3, which is a disk, to the end faces of 8 elastic links 20, which are supporting rods erected at equal intervals in the radial direction on the outer end face 1c of the flange part 1a of this altitude shaft 1. The respective links 20 are so arranged as to align the direction where the elastic links are elastically deformed in the radial direction of the tape carrier 3. The type carrier 3 is fixed to the end faces of these links. The stress of the altitude shaft 1 acts on the tape carrier 3 and the elastic links 20 when the altitude shaft 1 is deformed in the radial direction but the rigidity of the thin parts of the elastic links 20 is low and therefore, the elastic links 20 existing in the positions where the altitude shaft 1 is strained are deformed in the thin parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting an angle of an altitude axis of an optical infrared telescope, for example.

[0002]

2. Description of the Related Art FIG. 10 is a front view showing a conventional angle detecting device. 11 is a sectional view taken along the line XI-XI of FIG. Altitude axis 1 used for large optical infrared telescopes
Rotates as the vertical angle of the telescope changes,
The angle needs to be detected accurately. In the drawing, the altitude shaft 1 which is a rotary shaft having a substantially cylindrical shape and a flange portion 1a at one end is arranged with its axis substantially horizontal, and is substantially 90 degrees apart in the circumferential direction on the lower side of the cylindrical side surface. Placed 2
It is supported by individual hydrostatic bearings 2.

The angle detecting device 8 is a disk carrier having a diameter slightly larger than the diameter of the flange portion 1a of the altitude axis 1 and having a substantially thin plate ring shape, and the scanning head 6.
It consists of and. The tape carrier 3 has a concave portion 3a formed along a circular edge portion, and a side face 4 in the concave portion 3a facing the center of the tape carrier 3 has a scale (not shown) for reading a rotation angle. The tape 5 having the above-mentioned shape is attached over the entire circumference. In the recess 3a, a plurality of scanning heads 6 which are reading devices supported by a frame or the like (not shown) are arranged at equal intervals in the circumferential direction and face the tape 5.

In the angle detecting device 8, the back surface of the tape carrier 3 is provided on the outer end surface 1c of the flange portion 1a of the altitude shaft 1 at the end surfaces of eight links 7 which are support rods provided upright at equal intervals in the radial direction. , Fixedly attached.

In the conventional angle detecting device having such a structure, the rotation angle of the altitude shaft 1 supported by the hydrostatic bearing 2 is the scanning head 6 facing the tape 5 attached to the tape carrier 3. Read by.

[0006]

The altitude shaft 1 is supported by two hydrostatic bearings 2. Since the altitude shaft 1 has a substantially cylindrical shape, the altitude shaft 1 rotates when the altitude shaft 1 rotates. Due to its own weight, the periphery of the hydrostatic bearing 2 is slightly distorted. On the other hand, the conventional angle detecting device has the outer end surface 1 of the flange portion 1a of the altitude axis 1.
Since the back surface of the tape carrier 3 is fixedly attached to the c by the link 7 having high rigidity, when the altitude axis 1 is distorted, the tape carrier 3 is deformed due to the distortion, and the angle detection by the scanning head 6 is performed. There was a problem affecting accuracy.

Further, when the weight of the tape carrier 3 is large and its influence cannot be ignored, that is, when the link 7 is bent and bent by the weight of the tape carrier 3, the tape carrier 3 is displaced so as to be tilted slightly downward. There is a problem that the angle detection accuracy of the scanning head 6 is affected.

The present invention has been made to solve the above problems, and can suppress the deformation of the tape carrier, which is a disc, even when the altitude axis, which is the rotation axis, is deformed. An object of the present invention is to obtain an angle detection device that does not affect angle detection even when it is affected by the weight of the carrier itself.

[0009]

In the angle detecting device according to the first aspect of the present invention, the disk is supported by a plurality of elastic supporting rods provided upright on the rotating shaft.

According to another aspect of the angle detecting device of the present invention, the intermediate portion of the supporting rod is thinned to form a thin portion.

In the angle detecting device of the third aspect, the thin portion is thin in the radial direction of the disk.

In the angle detecting device of the fourth aspect, the thin portion is thin in the tangential direction of the disk.

According to another aspect of the angle detecting device of the present invention, the thin portion has a narrowed and narrowed shape over the entire circumference.

In the angle detecting device of the sixth aspect, the thin portion is formed at a plurality of locations.

In the angle detector of the seventh aspect, at least one of the plurality of support rods is a rigid support rod.

According to another aspect of the angle detecting device of the present invention, the disk is supported by a plurality of support rods which are erected on the rotating shaft and have rotatable joints at at least one position.

[0017]

In the angle detecting device according to the first aspect, the support rod absorbs the deformation of the rotating shaft and does not affect the disk.

In the angle detecting device of the second aspect, the support rod is partially thinned and elastically deforms at the thin portion.

In the angle detecting device of the third aspect, the support rod absorbs the radial deformation of the rotating shaft.

In the angle detecting device of the fourth aspect, the support rod absorbs the tangential deformation of the rotating shaft.

In the angle detecting device of the fifth aspect, the support rod absorbs the radial and tangential deformations of the rotating shaft.

In the angle detecting device of the fifth aspect, the support rod bends at a plurality of points.

In the angle detector of the sixth aspect, the rigid support rod does not bend.

In the angle detecting device of the seventh aspect, the support rod absorbs the deformation of the rotating shaft and does not affect the disk.

[0025]

【Example】

Example 1. FIG. 1 is a front view showing an embodiment of the angle detecting device of the present invention. FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is a diagram showing the shape of the link, and FIG. 4 is a diagram showing a state in which the link is deformed. Figure 10
The same or corresponding parts as those of the conventional angle detecting device shown in FIG. 11 are designated by the same reference numerals, and the description thereof will be omitted.

In the angle detecting device 8, as in the prior art, the back surface of the tape carrier 3 which is a disk is erected at equal intervals in the radial direction on the outer end surface 1c of the flange portion 1a of the altitude shaft 1 which is the rotating shaft. It is fixed to the end faces of eight elastic links 20 which are the supported rods and is attached to the altitude shaft 1. The tape carrier 3 is arranged perpendicular to the altitude axis 1.

The approximately central portion of the elastic link 20 having a substantially square rod shape is cut from both side surfaces into a semicircular cross section and partially thinned to form a thin portion 20a. Accordingly, the elastic link 20 can be elastically deformed at the thin portion 20a. Since the elastic link 20 is cut off only on two side surfaces, there is a direction with low rigidity, that is, a direction in which it elastically deforms, and a direction with large rigidity, that is, a direction in which it does not elastically deform (FIG. 3).

In this embodiment, the elastic links are arranged so that the elastically deforming direction of the elastic links 20 coincides with the radial direction of the tape carrier 3 (arrow A in FIG. 1), and the tape carrier 3 is attached to the end face thereof. Is fixed. When the altitude axis 1 is distorted in the radial direction, the stress acts on the tape carrier 3 and the elastic link 20, but since the thin portion 20a of the elastic link 20 has low rigidity, it is located in the distorted part of the altitude axis 1. The elastic link is deformed in the thin portion 20a (Fig. 4).

In the angle detecting device having such a structure, when the altitude shaft 1 rotates, even if deformation occurs around the hydrostatic bearing 2 of the altitude shaft 1 due to its own weight, the deformation is Since the thin portion 20a of the elastic link 20 is absorbed by the deformation, the deformation does not reach the tape carrier 3. Therefore, the accuracy required for angle detection can be guaranteed.

Example 2. FIG. 5 is a front view showing another embodiment of the angle detecting device of the present invention. In the first embodiment, the elastically deforming direction of the elastic link 20 is arranged so as to coincide with the radial direction of the tape carrier 3, but in the present embodiment, the elastically deforming direction coincides with the tangential direction of the tape carrier 3. Are arranged as shown in FIG. 5 (arrow B in FIG. 5).

In the angle detecting device having such a structure, even if the altitude shaft 1 is pressed by the hydrostatic bearing 2 and is deformed in the tangential direction, the tape carrier 3 is not deformed. Therefore, the accuracy required for angle detection can be guaranteed.

Example 3. FIG. 6 is a view showing the shape of an elastic link showing another embodiment of the angle detecting device of the present invention. In the first and second embodiments, the elastic link 20 in which one portion of the elastic link 20 is thin and the thin portion 20a is formed is used, but in this embodiment, the elastic link 21 is thinned in two portions. To use.

The approximately central portion of the elastic link 21 having a substantially square rod shape is cut from two side surfaces in a semicircular cross section at two locations to be partially thinned to form thin portions 21a and 21b. As a result, the elastic link 21 has the thin portion 21.
Elastic deformation occurs at two points a and 21b. The elastic link 21 is arranged and installed such that the elastically deforming direction thereof coincides with the radial direction or the tangential direction of the tape carrier 3. In the case where there is only one portion that elastically deforms as in the first and second embodiments, the elastic link 20 is deformed as if it were broken at the thin portion 20a, so the elastic link 2
The both ends of 0 are not parallel to each other, and if the deformation amount is large, stress is transmitted to the tape carrier 3 and the tape carrier 3
, And the tape carrier 3 is distorted.

In the elastic link 21 of this embodiment, 2
Since the thin-walled portions 21a and 21b are deformed, the thin-walled portions 21a and 21b are bent in opposite directions at the same angle,
Both ends of the elastic link 21 can be kept parallel.

In the angle detecting device having such a structure, since the elastic link 21 can be deformed at two places, both ends of the elastic link 21 can be kept parallel to each other and the flatness of the tape carrier 3 is not impaired. The tape carrier 3 is not distorted. Therefore, the accuracy required for angle detection can be guaranteed.

Example 4. FIG. 7 is a view showing the shape of a link showing another embodiment of the angle detecting device of the present invention. The link 22 of this embodiment is composed of a main body 12 and members 9 and 10 rotatably fixed to both ends of the main body 12 by pins 11. That is, the link 22 is at two places,
It has rotatable joints 9a and 10a.

The link 22 is arranged and installed so that the direction of rotation of the link 22 coincides with the radial direction or the tangential direction of the tape carrier 3.

In the angle detecting device having such a structure, since the link 22 can be rotated at two places, both ends of the link 22 can be kept parallel, and the flatness of the tape carrier 3 is not impaired. The tape carrier 3 is not distorted. Therefore, the accuracy required for angle detection can be guaranteed.

Example 5. FIG. 8 is a view showing the shape of a link showing another embodiment of the angle detecting device of the present invention. The elastic link 23 of the present embodiment includes a foot portion 23d having a substantially thin plate shape, and a shaft portion 23c having a substantially columnar shape that is provided upright on the foot portion 23d. The approximately central portion of the shaft portion 23c has two portions where the meat is shaved over the entire circumference and is partially thin.
Therefore, the accuracy required for angle detection can be guaranteed.

Since the elastic link 23 is carved in the entire circumference at two locations, it is elastically deformed in either direction. Since the elastic link 23 absorbs the tangential and radial deformations of the altitude axis 1, the disk does not deform. Therefore, the accuracy required for angle detection can be guaranteed.

Example 6. In the fifth embodiment, the elastic link 23 is used to absorb the deformation of the altitude axis 1. However, when the tape carrier 3 has a large self-weight and its influence cannot be ignored, that is, the elastic link 23 bends due to the self-weight of the tape carrier 3. The elastic link 23 is also effective when it is bent. This embodiment shows an example in which the elastic link 23 is used when the weight of the tape carrier 3 is large and its influence cannot be ignored, and the configuration is the same as that of the fifth embodiment.

Since the elastic link 23 is carved in the entire circumference at two locations, it is elastically deformed in either direction. Further, since the elastic link 23 can be deformed at two locations, both ends of the link 23 can be kept parallel, the flatness of the tape carrier 3 is not impaired, and the tape carrier 3 is not distorted. Further, the tape carrier 3 is eccentrically displaced vertically downward due to its own weight but is not displaced so as to be inclined downward. Therefore, by adjusting the amount of eccentricity, the accuracy required for angle detection can be guaranteed.

Example 7. FIG. 9 is a sectional view showing another embodiment of the angle detecting device of the present invention. This embodiment is the fifth embodiment.
Similarly, a plurality of elastic links 23 are provided upright at equal intervals in the radial direction, and one of the plurality of links is a rigid link 13. The rigid link 13 has a flange portion 1a at the upper portion where the altitude axis 1 is not deformed.
The tape carrier 3 is fixed by standing on the outer end surface 1c.

In the fifth embodiment using the elastic link 23,
When the self-weight of the tape carrier 3 is large and its influence cannot be ignored, that is, when the elastic link 23 is bent and bent by the self-weight of the tape carrier 3, the surface of the tape carrier 3 is displaced so as to be slightly inclined downward.

However, in this embodiment, since the side portion located at the upper end of the vertically arranged tape carrier 3 is supported by the single rigid link 13, the surface of the tape carrier 3 is inclined slightly downward. It will not be displaced.

Therefore, the elastic link 23 has the height axis 1
Since the disk is not deformed and the surface of the tape carrier 3 is not displaced so as to be tilted slightly downward, the accuracy required for angle detection is improved. Can be guaranteed. When the weight of the tape carrier 3 is large, the rigid link 13 is increased in number by increasing the effect. Further, in this embodiment,
Although the example in which the elastic link 23 and the rigid link 13 are combined is shown, the effect can be expected by combining the link and the rigid link 13 shown in other embodiments.

[0047]

In the angle detecting device according to the first aspect of the present invention, since the disk is supported by the plurality of elastic support rods provided upright on the rotation shaft, the support rod prevents the rotation shaft from being deformed. Absorbs, does not affect the disk, even if the rotating shaft is deformed,
The angle detection device can accurately detect the angle.

In the angle detecting device according to the second aspect of the present invention, since the intermediate portion of the supporting rod is thinned to form the thin portion, a supporting rod capable of moderate elastic deformation can be easily prepared. it can.

In the angle detecting device of the third aspect, since the thin portion is thin in the radial direction of the disk,
The support rod absorbs the radial deformation of the rotating shaft. Therefore, even if the rotating shaft is deformed in the radial direction, the angle detection device can accurately detect the angle.

In the angle detecting device of the fourth aspect, since the thin portion is thin in the tangential direction of the disc,
The support rod absorbs the tangential deformation of the rotating shaft. Therefore, even if the rotating shaft is deformed in the tangential direction, the angle detecting device can accurately detect the angle.

In the angle detecting device according to the fifth aspect of the invention, since the thin wall portion has a narrowed and narrowed shape over the entire circumference, the support rod absorbs the tangential and radial deformations of the rotary shaft. Therefore, even if the rotating shaft is deformed in the radial direction and the tangential direction, the angle detection device can accurately detect the angle.

In the angle detecting device of the sixth aspect, since the thin portion is formed at a plurality of places, the support rod is bent at a plurality of places. Therefore, the flatness of the disk is not impaired, and the angle detection device can accurately detect the angle.

In the angle detecting device of the seventh aspect, at least one of the plurality of support rods is a rigid support rod, and the rigid support rod does not bend, so that the disk does not tilt downward, The angle detection device can accurately detect the angle.

In the angle detecting device of the eighth aspect, since the disc is supported by a plurality of support rods which are erected on the rotation shaft and have rotatable joints at at least one place, the support rods are By absorbing the deformation of the rotating shaft and not affecting the disk, the angle detecting device can accurately detect the angle even if the rotating shaft is deformed.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an angle detection device of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a diagram showing the shapes of the links in FIGS. 1 and 2.

FIG. 4 is a diagram showing a modified state of the link in FIG.

FIG. 5 is a front view showing another embodiment of the angle detection device of the present invention.

FIG. 6 is a view showing the shape of an elastic link showing another embodiment of the angle detecting device of the present invention.

FIG. 7 is a diagram showing a shape of a link showing another embodiment of the angle detecting device of the present invention.

FIG. 8 is a view showing a shape of a link showing another embodiment of the angle detecting device of the present invention.

FIG. 9 is a cross-sectional view showing another embodiment of the angle detection device of the present invention.

FIG. 10 is a front view showing a conventional angle detection device.

11 is a sectional view taken along the line XI-XI in FIG.

[Explanation of symbols]

1 altitude axis (rotation axis), 3 tape carrier (disk),
6 scanning heads (readers), 9a, 10a joints, 1
3 Rigid links (rigid support bars), 20, 21, 23
Elastic links (support bars), 20a, 21a, 21b, 23
a, 23b Thin portion.

Claims (8)

[Claims] 1. A disk, which is arranged perpendicularly to a rotation axis and has a scale formed along the circumference, and a reading device which is arranged so as to face the scale and reads the scale. In the angle detection device, the disc is supported by a plurality of elastic support rods provided upright on the rotation shaft. 2. The angle detecting device according to claim 1, wherein an intermediate portion of the support rod is thinned to form a thin portion. 3. The angle detecting device according to claim 2, wherein the thin portion is thin in the radial direction of the disk. 4. The angle detecting device according to claim 2, wherein the thin portion is thin in a tangential direction of the disk. 5. The thin portion is constricted around the entire circumference,
The angle detection device according to claim 2, wherein the angle detection device has a narrowed shape. 6. The angle detection device according to claim 2, wherein the thin portion is formed at a plurality of positions of the support rod. 7. At least one of the plurality of support rods.
The angle detection device according to claim 1, wherein the book is a rigid support rod. 8. A disk, which is arranged perpendicularly to the rotation axis and has a scale formed along the circumference, and a reading device which is arranged so as to face the scale and reads the scale. In the angle detection device, the disc includes a plurality of support rods that are erected on the rotation shaft and that have at least one rotatable joint.
An angle detection device characterized by being supported.