Mirror curvature adjustment mechanism

Abstract

To suppress a local deformation and adjust the curvature of a mirror.SOLUTION: A mirror curvature adjustment mechanism 100 comprises a first rod set 110, a second rod set 120, and an actuator 130. In a plurality of rods 111, each other's one ends are fastened at a first fastening point 112 and the other ends are circumferentially arranged, with each of the other ends connected to a mirror 140. In a plurality of rods 121, each other's one ends are fastened at a second fastening point 122 and the other ends are circumferentially arranged, with each of the other ends connected to a mirror 140. The actuator 130 causes the position of the first fastening point 112 and / or the second fastening point 122 to change along the center axis of the mirror 140.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a mechanism for adjusting the curvature of a mirror. [Background technology]

[0002] A conventional curvature adjustment mechanism for a satellite-mounted mirror is composed of a central shaft equipped with an actuator and a rod connecting the central shaft to the outer periphery of the mirror. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] NASA JAMES WEBB SPACE TELESCOPE GODDARD SPACE FLIGHT CENTER “James Webb Space Telescope”. Webb's Launch GSFC / NASA. https: / / www.jwst.nasa.gov / , (Reference: 2021-12-24). Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional curvature adjustment mechanisms have the problem that local deformation remains in the center of the mirror when the mirror surface is adjusted to the desired curvature. This local deformation reduces the optical performance of the mirror.

[0005] The present disclosure aims to enable adjustment of the curvature of a mirror while suppressing local deformation. [Means for solving the problem]

[0006] The mirror curvature adjustment mechanism of the present disclosure includes: a first rod set consisting of a plurality of rods, each of which has one end fastened to the central axis of the mirror on the rear surface side of the mirror and the other end arranged circumferentially around an intersection of the central axis of the mirror and the rear surface of the mirror, and each of which has the other end coupled to the mirror; a second rod set consisting of a plurality of rods, one end of each of which is fastened to the central axis of the mirror on the rear surface side of the mirror, the other end of which is arranged circumferentially around the intersection point inside the circumference formed by the other end of the first rod set, and each of the other ends is coupled to the mirror; an actuator connected to the first rod set at a first fastening point where one end of the first rod set is fastened, and connected to the second rod set at a second fastening point where one end of the second rod set is fastened, and configured to change the position of at least one of the first fastening point and the second fastening point along the central axis of the mirror; Equipped with. [Effects of the Invention]

[0007] According to the present disclosure, the curvature of the mirror can be adjusted while suppressing local deformation. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a configuration diagram of a mirror curvature adjustment mechanism 100 according to the first embodiment. [Figure 2] FIG. 10 is a diagram illustrating the configuration of a conventional mirror curvature adjustment mechanism 190. [Figure 3] 10A and 10B are diagrams showing the results of curvature adjustment by a conventional mirror curvature adjustment mechanism 190. [Figure 4] 4A and 4B are diagrams showing the results of curvature adjustment by the mirror curvature adjustment mechanism 100 according to the first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the embodiments and drawings, the same or corresponding elements are denoted by the same reference numerals, and the description of elements denoted by the same reference numerals as elements already described will be omitted or simplified as appropriate.

[0010] Embodiment 1 The mirror curvature adjustment mechanism 100 will be described with reference to FIGS.

[0011] ***Configuration Description*** The configuration of the mirror curvature adjustment mechanism 100 will be described with reference to FIG. The mirror curvature adjustment mechanism 100 is a mechanism for adjusting the curvature of the mirror 140. The mirror 140 is, for example, a mirror mounted on an artificial satellite. In mirror 140, an axis passing through the center of the front surface and the center of back surface 141 is referred to as a central axis. Mirror 140 is, for example, a circular mirror.

[0012] The mirror curvature adjustment mechanism 100 includes a first rod set 110, a second rod set 120, and an actuator . The first rod group 110 , the second rod group 120 and the actuator 130 are provided on the rear surface 141 side of the mirror 140 .

[0013] The first rod set 110 is made up of a plurality of rods 111. For example, the first rod set 110 is made up of six rods 111. One end of each of the rods 111 is fastened to the central axis of the mirror 140. For example, six ends of six rods 111 are fastened to each other. The first fastening point 112 is a point on the central axis of the mirror 140 to which one end of the first rod set 110 is fastened.

[0014] The other ends of the multiple rods 111 are arranged circumferentially around the intersection of the central axis of the mirror 140 and the back surface 141 of the mirror 140. For example, six ends of six rods 111 are arranged circumferentially at equal intervals. The intersection of the central axis of the mirror 140 and the back surface 141 of the mirror 140 corresponds to the center of the back surface 141 of the mirror 140. The other ends of the rods 111 are coupled to the mirror 140. For example, the other ends of the rods 111 are coupled to the edge portion of the circular rear surface 141.

[0015] The second rod set 120 is made up of a plurality of rods 121. For example, the second rod set 120 is made up of six rods 121. One end of each of the rods 121 is fastened to the central axis of the mirror 140. For example, six ends of six rods 121 are fastened to each other. The second fastening point 122 is a point to which one end of the second rod set 120 is fastened on the central axis of the mirror 140. For example, the second fastening point 122 is located between the first fastening point 112 and the center of the mirror 140 on the rear surface 141 side of the mirror 140.

[0016] The other ends of the multiple rods 121 are arranged circumferentially around the intersection of the central axis of the mirror 140 and the rear surface 141 of the mirror 140. For example, six ends of six rods 121 are arranged circumferentially at equal intervals. The circumference formed by the other end of the second rod set 120 is located inside the circumference formed by the other end of the first rod set 110. For example, the end of each rod 121 is located on the back surface 141 side of the mirror 140, on a line segment connecting the center of the mirror 140 and the connecting end of the rod 111. The other ends of the rods 121 are coupled to the mirror 140 (the rear surface 141 thereof).

[0017] The stiffness of the rods (111, 121) is greater than the stiffness of the mirror 140.

[0018] The actuator 130 is connected to the first rod set 110 at a first fastening point 112 and to the second rod set 120 at a second fastening point 122, and changes the position of at least one of the first fastening point 112 and the second fastening point 122 along the central axis of the mirror 140.

[0019] For example, the actuator 130 includes an actuator body, a first actuator rod, and a second actuator rod. The actuator body is disposed between the first fastening point 112 and the second fastening point 122 . The first actuator rod is disposed on the side of the first fastening point 112. One end of the first actuator rod is connected to the actuator body, and the other end is fastened to one end of the first rod set 110 at the first fastening point 112. The second actuator rod is disposed on the side of the second fastening point 122. One end of the second actuator rod is connected to the actuator body, and the other end is fastened to one end of the second rod set 120 at the second fastening point 122. The actuator body changes the length between the first fastening point 112 and the second fastening point 122 by moving the first actuator rod and the second actuator rod, respectively, along the central axis of the mirror 140 .

[0020] ***Feature Description*** The function of the mirror curvature adjustment mechanism 100 will now be described. The actuator 130 changes the distance between the first fastening point 112 and the second fastening point 122. This changes the respective positions of the first fastening point 112 and the second fastening point 122 on the central axis of the mirror 140. Because the rigidity of the rods (111, 121) is greater than the rigidity of the mirror 140, a force is transmitted to the mirror 140 via the rods (111, 121) as the positions of the first fastening point 112 and the second fastening point 122 change. As a result, the periphery of the center of the mirror 140 is pulled. Alternatively, the periphery of the center of the mirror 140 is compressed. As a result, the mirror 140 is deformed, and the curvature of the mirror 140 changes. That is, the actuator 130 can adjust the curvature of the mirror 140 .

[0021] ***Effects of the First Embodiment*** The effects of the first embodiment will be described with reference to FIGS. FIG. 2 shows a conventional mirror curvature adjustment mechanism 190. The mirror curvature adjustment mechanism 190 includes an actuator 191 and a rod set 192 . The rod set 192 is made up of a plurality of rods 193 . The fastening point 194 is a point at which one end point of each of the rods 193 is fastened to the central axis of the mirror 140 . Actuator 191 changes the length between the center of mirror 140 and fastening point 194. This transmits force to the center of mirror 140 and the circumferential edge of back surface 141 of mirror 140 via multiple rods 193. As a result, the curvature of mirror 140 changes.

[0022] 3 shows the results of curvature adjustment using the conventional mirror curvature adjustment mechanism 190. In the mirror 140, portions that are significantly different from the ideal curvature adjustment results are shown in black or white. The central portion of the mirror 140 is shown in white, and the area surrounding the central portion of the mirror 140 is shown in black, which means that a local deformation occurs in the central portion of the mirror 140. This result is due to the fact that the single rod of the actuator 191 adjusts the curvature of the central portion of the mirror 140 .

[0023] FIG. 4 shows the result of curvature adjustment by the mirror curvature adjustment mechanism 100 according to the first embodiment. The entire mirror 140 is uniformly displayed in a color between black and white. In other words, the curvature of the mirror 140 is ideally adjusted, and no local deformation occurs in the center of the mirror 140. This result is due to the effect that the first rod group 110 and the second rod group 120 distribute the tensile or compressive force to adjust the curvature of the mirror 140 .

[0024] ***Summary of the first embodiment*** Conventional curvature adjustment of satellite-mounted mirrors results in unintended local deformation in the central part of the mirror. In the first embodiment, the mounting structure of the actuator of the curvature adjustment mechanism is devised to suppress local deformation and to prevent deterioration of the optical performance of the mirror. The mirror curvature adjustment mechanism 100 uses an actuator 130 to tension or compress the periphery of the center of the mirror 140 rather than at the center of the mirror 140 via a first rod set 110 and a second rod set 120 .

[0025] ***Supplement to the first embodiment*** The first embodiment is an example of a preferred embodiment and is not intended to limit the technical scope of the present disclosure. [Explanation of symbols]

[0026] 100 mirror curvature adjustment mechanism, 110 first rod set, 111 rod, 112 first fastening point, 120 second rod set, 121 rod, 122 second fastening point, 130 actuator, 140 mirror, 141 back surface, 190 mirror curvature adjustment mechanism, 191 actuator, 192 rod set, 193 rod, 194 fastening point.

Claims

1. a first rod set consisting of a plurality of rods, each of which has one end fastened to the central axis of the mirror on the rear surface side of the mirror and the other end arranged circumferentially around an intersection of the central axis of the mirror and the rear surface of the mirror, and each of which has the other end coupled to the mirror; a second rod set consisting of a plurality of rods, one end of each of which is fastened to the central axis of the mirror on the rear surface side of the mirror, the other end of which is arranged circumferentially around the intersection point inside the circumference formed by the other end of each of the first rod set, and each of the other ends is coupled to the mirror; an actuator connected to the first rod set at a first fastening point where one end of the first rod set is fastened, and connected to the second rod set at a second fastening point where one end of the second rod set is fastened, and configured to change the position of at least one of the first fastening point and the second fastening point along the central axis of the mirror; Equipped with a mirror curvature adjustment mechanism.

2. the actuator changes the position of at least one of the first and second fastening points along the central axis of the mirror to change the length between the first and second fastening points; a change in length between the first and second fastening points tensions or compresses the mirror around its center; The periphery of the center of the mirror is stretched or compressed to adjust the curvature of the mirror. The mirror curvature adjustment mechanism according to claim 1 .

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