JP4911476B2 - Telescope primary mirror unit - Google Patents

Description

  The present invention relates to a telescope main mirror unit device used in a telescope device, and can suppress thermal deformation of a support structure unit that supports a main reflecting mirror and a sub-reflecting mirror, and can reduce a pointing direction error of the telescope accompanying thermal deformation. The present invention relates to a telescope main mirror unit that can be used.

  In the field of astronomy these days, there is an increasing demand for receiving observation waves from distant celestial bodies with higher accuracy and higher resolution. For this reason, higher accuracy is required for the reflecting mirror performance of the telescope and the directivity performance of the telescope. On the other hand, the telescope is required to have a large aperture, and the entire telescope device is becoming larger and heavier. Yes.

  In the telescope device that is thus increased in size, for example, the heat input condition at each part in the device differs depending on the sunlight. For this reason, temperature distribution is generated in the telescope device, complicated thermal deformation occurs, and the directivity direction is shifted. Further, the entire apparatus is deformed by wind pressure, and an error occurs in the directivity direction, making it difficult to obtain the required high directivity performance.

  As a conventional technique for reducing the thermal deformation and eliminating the pointing error, for example, there is a structure disclosed in Patent Document 1 that suppresses the thermal deformation of the structural member due to direct sunlight. By applying this structure to the rotating structure portion of the antenna device, thermal deformation due to solar radiation of the rotating structure portion can be suppressed.

  Briefly, in the structure of Patent Document 1, the outer periphery of a structural member is covered with a cover at an interval with respect to the outer peripheral surface, and a plurality of cover sections forming the cover are bundled with bands and reinforced with ribs. ing. The amount of heat generated by solar radiation to the cover is transmitted to the air between the structural member and the cover, but since this amount of heat is small, the thermal deformation of the structural member can be suppressed, and the antenna The influence on the pointing accuracy can be reduced.

Japanese Patent Laid-Open No. 3-42902

  As described above, in the structure for suppressing thermal deformation disclosed in Patent Document 1, a cover is provided for each structural member. However, a portion where the number of structural members increases, for example, a large telescope device However, in the support truss structure or the like configured on the back of the main reflector, there are cases where the number of members ranges from several tens to one hundred or more, and there is a problem that the number of parts of the cover to be attached increases.

  In addition, there are mounting points of the main reflector panel everywhere on the surface of the support truss structure of the main reflector, which complicates the structure for mounting the cover so as not to mechanically interfere with the mounting point. It was.

  Furthermore, in the structure for suppressing thermal deformation disclosed in Patent Document 1, the amount of heat due to solar radiation to the cover is transmitted through the air between the structural member and the cover, and the amount of heat transmitted is small. However, if the temperature of the cover part changes, the temperature of the structural member also changes accordingly, so if the heat input distribution due to solar radiation is not uniform when viewed on the entire structural member, local temperature changes of the structural member May occur and may thermally deform locally.

  For example, in the support truss structure that supports the main reflector as described above from the back side, the overall size of the support truss structure is large, and depending on the solar radiation conditions, the part directly receiving solar radiation and the main reflector and support truss structure A shadowed part is generated by the central structure. For this reason, the distribution of heat input occurs, and the support truss structure is locally thermally deformed, so that the surface accuracy of the main reflector panel deteriorates, and further, the pointing direction error of the telescope occurs. was there.

  The present invention has been made to solve the above-described problems, and reduces the thermal deformation of the support structure part that supports the main reflecting mirror and the sub-reflecting mirror, and suppresses the pointing direction error of the telescope. An object of the present invention is to obtain a telescope main mirror unit that receives observation waves from an observation source such as the above.

  The telescope main mirror unit according to the first aspect of the present invention is provided with a main reflecting mirror that reflects an observation wave from an observation source and the main reflecting mirror, and condenses the reflected wave of the main reflecting mirror. A sub-reflecting mirror that reflects to the observation device, a support structure that supports the main reflecting mirror from the back surface, a center hub provided at the center of the back surface of the main reflecting mirror, and the main reflecting mirror from the center hub A support structure having a plurality of pipe members provided radially extending to the peripheral edge of the main reflector, a cover for covering the support structure from the back side of the main reflector, and an end opening of the pipe member. A first blower that causes the air to flow into the space surrounded by the cover and the main reflecting mirror through the pipe of the pipe member.

A telescope main mirror unit apparatus according to a second aspect of the invention is the telescope main mirror unit apparatus according to the first aspect of the invention, comprising an air tank communicating with a pipe member connected to a center hub,
The first blower causes the air introduced from the end opening of the pipe member to flow into the air tank through a pipe of the pipe member, and further through the space surrounded by the cover and the main reflector. It is intended to be sent to the outside.

  A telescope main mirror device according to a third aspect of the invention is the telescope main mirror device according to the second aspect of the invention, wherein an air tank is provided in a ring shape around the central portion of the main reflector, A plurality of first blowers are juxtaposed in a ring shape along the peripheral side surface of the main reflecting mirror.

  According to a fourth aspect of the present invention, a telescope main mirror unit device is provided with a main reflecting mirror that reflects an observation wave from an observation source and the main reflecting mirror, and condenses the reflected wave of the main reflecting mirror. A sub-reflecting mirror that reflects to the observation device, a support structure that supports the main reflecting mirror from the back surface, a center hub provided at the center of the back surface of the main reflecting mirror, and the main reflecting mirror from the center hub A support structure portion having a plurality of pipe members provided radially extending to the peripheral edge portion, a cover covering the support structure portion from the back side of the main reflector, and a pipe member connected to the support structure portion The stay and the main reflection are formed through the stay portion supporting the sub-reflecting mirror and the air flowing from the end opening on the sub-reflecting mirror side of the pipe member of the stay portion through the pipe of the pipe member of the stay portion. The first flow into the space surrounded by the mirror It is obtained by a blower.

  According to the first to third aspects of the present invention, external air is introduced from the end of the pipe member of the support structure that supports the main reflector, and the space surrounded by the cover and the main reflector through the pipe. Therefore, the heat input to the pipe member of the support structure portion can be exhausted by the external air, and local thermal deformation of the support structure portion can be suppressed.

  According to the fourth aspect of the invention, the external air is caused to flow from the end of the pipe member of the stay portion that supports the sub-reflecting mirror, and then flows into the area surrounded by the cover portion and the main reflecting mirror through the pipe. The heat input to the pipe member of the stay portion can be exhausted by the external air, and local thermal deformation of the stay portion can be suppressed.

Embodiment 1 FIG.
FIG. 1 is a diagram showing an external appearance of a telescope device using a telescope main mirror unit device according to Embodiment 1 of the present invention, FIG. 1 (a) is a front view of the telescope device, and FIG. It is a side view of a telescope apparatus. In FIG. 1, the telescope device according to the first embodiment includes a main reflecting mirror 1, a sub-reflecting mirror 2, a support structure portion 3, a stay portion 4, an observation device 5, an elevation angle shaft portion 6, a yoke portion 7 and an apparatus mount 8. Prepare.

  The main reflecting mirror 1 is composed of a plurality of reflecting mirror panels, and reflects the observation wave from the observation source. The sub-reflecting mirror 2 further reflects the observation wave reflected by the main reflecting mirror 1 and condenses it on the central portion of the main reflecting mirror 1. The support structure 3 is provided on the back side of the main reflector 1 and supports the main reflector 1. The stay portion 4 supports the sub-reflecting mirror 2 at a position facing the mirror surface of the main reflecting mirror 1 as shown in FIG. The observation device 5 receives the observation waves collected by the sub-reflecting mirror 2 and performs observation.

  As shown in FIG. 1A, the elevation angle shaft portion 6 is supported by a front U-shaped yoke portion 7 so as to be rotatable around the elevation angle axis. The apparatus base 8 supports the yoke portion 7 so as to be rotatable around the azimuth axis. Here, the apparatus including the main reflector 1, the sub-reflector 2, the support structure 3, the stay 4, the observation device 5, the elevation angle shaft 6, and the blower described later with reference to FIGS. As shown in FIG. 1B, the telescope main mirror unit rotates about the elevation axis via the elevation angle shaft unit 6.

  FIG. 2 is a perspective view showing the main reflector and the support structure part of the telescope main mirror unit device in FIG. 1, and a part of the reflector panel of the main reflector 1 is removed to visually recognize the structure of the support structure part 3. It is described as possible. In FIG. 2, the center hub 9 of the support structure part 3 is provided in the center part of the back surface of the main reflective mirror 1, and the pipe members 10 and 11 are connected. In order to support the reflector panel of the main reflector 1 via these pipe members 10 and 11, the center hub 9 is made to have high rigidity.

  The pipe member 10 extends radially from the center hub 9 toward the peripheral edge of the main reflector 1, and the reflector panel of the main reflector 1 is attached along the pipe member 10. The panel member 11 is provided for each pipe member 10 and is connected to the center hub 9 so as to support the pipe member 10 from below. In the telescope main mirror unit apparatus, the main reflecting mirror 1 is attached to the support structure unit 3 having the center hub 9 at the bottom, and hereinafter, the mirror surface side of the main reflecting mirror 1 is set to the upper side and the back surface thereof. The description will be made appropriately with the side as the lower side.

  The side cover 12 is provided on the peripheral side surface of the main reflecting mirror 1, and the lower surface cover 13 covers the surface of the support structure 3 opposite to the main reflecting mirror 1. The partition wall 14 is provided at a substantially intermediate position between the adjacent pipe members 10 (or between the adjacent pipe members 11), and the main reflecting mirror 1, the lower surface cover 13, the adjacent pipe members 10, and the adjacent pipe members corresponding thereto. A space surrounded by 11 is partitioned.

Next, the structure of the telescope main mirror will be described.
FIG. 3 is a diagram showing the structure of the telescope main mirror unit device according to the first embodiment. A part of the main reflector 1 and the support structure unit 3 in FIG. The cross section at the time of cutting with the surface containing the mirror axis of the mirror 1 is shown. As shown in FIG. 3, the pipe members 10 and 11 are coupled to the center hub 9 along the reflector panel of the main reflector 1 and the lower surface cover 13, respectively.

  The center hub 9 is provided with an air tank 16, and the air tank 16 communicates with an end opening connected to the center hub 9 of the pipe members 10 and 11. Thereby, as shown by the arrow a in FIG. 3, the air in the pipes of the pipe members 10 and 11 can flow into the air tank 16.

  A blower 15 is attached to the air tank 16. The blower 15 sends the air in the air tank 16 toward the space surrounded by the side cover 12, the lower cover 13, and the main reflecting mirror 1 (blows in the direction of arrow A in the drawing). At this time, external air is taken in from the opening on the peripheral side of the main reflecting mirror 1 of the pipe members 10, 11 and flows into the air tank 16 through the pipes of the pipe members 10, 11.

  The air sent to the space surrounded by the side cover 12, the lower cover 13 and the main reflector 1 by the blower 15 is again discharged to the outside of the support structure 3 through the mesh provided on the side cover 12.

  As shown in FIG. 3, a blower 17 is provided between the back surface of the reflecting mirror panel of the main reflecting mirror 1 and the connecting portion of the pipe member 10 to the center hub 9, and this blower 17 indicates the arrow b in FIG. 3. You may comprise so that air may be discharged | emitted by the flow. By comprising in this way, the air which goes to the center part of the main reflective mirror 1 by the air blower 17 can be discharged | emitted without stagnation.

  Note that a gap is provided between the main reflecting mirror 1, the side cover 12, and the lower surface cover 13 at the peripheral edge of the main reflecting mirror 1. External air that has flowed in from the outside through this gap flows into the end openings of the pipe members 10 and 11 as shown by an arrow c in FIG. 3, and flows into the air tank 16 of the center hub 9 through the inside of the pipe. . Moreover, you may provide the edge part of the pipe members 10 and 11 so that it may protrude outside from the side cover 12. FIG.

  By circulating the external air in the support structure 3 in this manner, the external air always passes through the pipe members 10 and 11, and heat input to the pipe members 10 and 11 due to solar radiation or the like is used as a medium. Exhausted heat. Further, the heat transfer in the axial direction of the pipe members 10 and 11 can be improved by the circulation of the external air. Therefore, the local temperature rise of the pipe members 10 and 11 is suppressed, and thermal deformation can be reduced.

  As described above, FIG. 3 shows a cross section including the mirror axis of the main reflecting mirror 1, which can be said to be a cross section of a fan-shaped portion corresponding to a predetermined central angle θ from the central portion to the peripheral portion. . Further, as seen in FIG. 2, 24 pipe members 10 and 11 are provided from the center hub 9 so as to extend radially from the central portion to the peripheral portion of the main reflecting mirror 1, and the central angle θ = It can be considered that the fan-shaped portion of 15 ° is divided into 24 sections. In the fan-shaped section, the partition wall 14 is provided so that air does not flow in and out between adjacent sections.

  Further, when viewing FIG. 2 in three dimensions, the air tank 16 provided in the center hub 9 is provided in a ring shape around the central portion of the main reflecting mirror 1 (arranged in a ring shape around the central portion of the main reflecting mirror 1). Provided along one circumference of the center hub 9). Here, each air tank 16 forms an individual space corresponding to the fan sections of 24 sections (there is no air inflow / outflow between the air tanks 16).

  The blower 15 is provided for each air tank 16 on one surface of the air tank 16 (a surface on the outer peripheral side when viewed from the mirror axis of the main reflecting mirror 1). In addition, the blower 15 has 24 pieces along the peripheral side surface of the main reflector 1 of the air tank 16 provided in a ring shape around the mirror axis of the main reflector 1 (around the center of the main reflector 1). Are arranged side by side. At this time, the air blowing directions of the 24 blowers 15 are the peripheral edge side direction of the main reflecting mirror 1 (the direction of arrow A in FIG. 3).

  2 does not necessarily have to be divided by the number of pipe members 10 in FIG. 2, but several pieces are combined into one fan-shaped portion to reduce the number of divisions as a whole. You may do it.

  Further, when allowing the air to enter and exit between the compartments, the partition wall 14 may be omitted, and the air tank 16 may be configured as a common air tank for all the sections.

  As described above, according to the first embodiment, the pipe members 10 and 11 that support the main reflecting mirror 1 are provided so as to extend radially from the center hub 9 to the peripheral edge of the main reflecting mirror 1. Since the air blower 15 is provided for flowing the air introduced from the end openings of the pipes 10 and 11 into the space surrounded by the covers 12 and 13 and the main reflector 1 through the pipes of the pipe members 10 and 11, the main reflector 1 is provided. Since the external air that has flowed in through the supporting pipe members 10 and 11 circulates in the support structure portion 3 and is radiated as a medium, the heat of the support structure portion 3 that supports the main reflector 1 in the telescope main mirror portion. Deformation can be reduced. Thereby, the directivity direction error of the telescope accompanying thermal deformation of the support structure 3 can be suppressed.

Embodiment 2. FIG.
FIG. 4 is a diagram showing the structure of the telescope main mirror unit device according to the second embodiment of the present invention, and shows a cross section taken along a plane including the mirror axis of the main reflector 1 along the pipe members 10 and 11. Show. As shown in FIG. 4, in the second embodiment, a blower 18 is provided in the vicinity of the end of the pipe member constituting the stay portion 4 on the support structure portion 3 side. Further, both end portions of the pipe member constituting the stay portion 4 are opened on the sub-reflecting mirror 2 side and the support structure portion 3 side, respectively.

  The blower 18 sends out air in the direction indicated by the arrow B in FIG. 4 so that the air in the pipe member of the stay portion 4 is supplied to the side cover 12, the lower surface cover 13, and the main reflector of the support structure portion 3. 1 is sent out toward the space surrounded by the reflector panel. That is, as indicated by an arrow d in FIG. 4, the air flowing in from the end opening on the sub-reflecting mirror 2 side of the pipe member of the stay portion 4 passes through the pipe of the pipe member of the stay portion 4 and the support structure portion 3. To the above space.

  In the example shown in FIG. 4, the configuration in which the air is sent to the space surrounded by the side cover 12, the lower surface cover 13, and the main reflecting mirror 1 is shown. You may make it the structure which discharges the in-pipe air of the pipe member of the part 4 to the exterior from the discharge port of the lower surface cover 13. FIG.

  As described above, according to the second embodiment, the stay portion 4 that supports the sub-reflecting mirror 2 is constituted by a pipe member having one end connected to the support structure portion 3, and the sub-member of the pipe member of the stay portion 4 is subordinate. Since the air blower 18 is provided to flow the air that has flowed in from the end opening on the reflecting mirror 2 side into the space surrounded by the covers 12 and 13 and the main reflecting mirror 1 through the pipe of the pipe member of the stay portion 4, External air always passes through the pipe member of the stay part 4, and heat input to the stay part 4 by solar radiation or the like can be exhausted.

  Further, external air circulates in the support structure 3 through the stay portion 4 made of a pipe member that supports the sub-reflecting mirror, so that heat transfer in the axial direction of the pipe member of the stay portion 4 is also improved. Thereby, the local temperature rise of the pipe member of the stay part 4 is suppressed, and thermal deformation can be reduced.

It is a figure which shows the external appearance of the telescope apparatus using the telescope main mirror part apparatus by Embodiment 1 of this invention. It is a perspective view which shows the main reflective mirror and support structure part in FIG. It is a figure which shows the structure of the telescope main mirror part apparatus by Embodiment 1. FIG. It is a figure which shows the structure of the telescope main mirror part apparatus by Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Main reflecting mirror, 2 Sub reflecting mirror, 3 Support structure part, 4 Stay part, 5 Observation apparatus, 6 Elevation angle shaft part, 7 Yoke part, 8 Apparatus mount, 9 Center hub, 10, 11 Pipe member, 12 Side cover, 13 Bottom cover, 14 Bulkhead, 15, 17, 18 Blower, 16 Air tank.

Claims (4)

A main reflector that reflects the observation wave from the source;
A sub-reflecting mirror provided opposite to the main reflecting mirror, condensing the reflected wave of the main reflecting mirror and reflecting it to the observation device;
A support structure for supporting the main reflector from the back surface, a center hub provided at the center of the back surface of the main reflector, and extending radially from the center hub to the peripheral portion of the main reflector A support structure having a plurality of pipe members;
A cover that covers the support structure from the back side of the main reflector;
A telescope main mirror unit device comprising: a first blower that causes air introduced from an end opening of the pipe member to flow into a space surrounded by the cover and the main reflecting mirror through a pipe of the pipe member. An air tank communicating with the pipe member connected to the center hub is provided.
The first blower causes the air introduced from the end opening of the pipe member to flow into the air tank through a pipe of the pipe member, and further through the space surrounded by the cover and the main reflector. The telescope main mirror device according to claim 1, wherein the telescope main mirror device is sent to the outside of the telescope. The air tank is provided in a ring around the center of the main reflector,
3. The telescope main mirror unit according to claim 2, wherein a plurality of first fans are arranged in a ring shape along a peripheral side surface of the main reflector in the air tank. A main reflector that reflects the observation wave from the source;
A sub-reflecting mirror provided opposite to the main reflecting mirror, condensing the reflected wave of the main reflecting mirror and reflecting it to the observation device;
A support structure for supporting the main reflector from the back surface, a center hub provided at the center of the back surface of the main reflector, and extending radially from the center hub to the peripheral portion of the main reflector A support structure having a plurality of pipe members;
A cover that covers the support structure from the back side of the main reflector;
A stay member for supporting the sub-reflecting mirror, comprising a pipe member connected to the support structure;
A second blower for letting air that has flowed in from the end opening on the sub-reflector side of the pipe member of the stay portion to flow into the space surrounded by the cover and the main reflector through the pipe of the pipe member of the stay portion; Telescope main mirror unit device equipped with.

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