JP2005328166A - Parabolic reflector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a parabolic reflector capable of forming a highly precise parabolic plane at expansion and downsizing the dimension in a contained state. <P>SOLUTION: The parabolic reflector includes: a center part 11 of nearly a circular shape; a ribbon part 12 expandable in spiral at an outer circumference of the center part 11; and a support structure 41 radially extended from the rear side of the center part 11 to support the ribbon part 12 after expansion from the rear side thereof, and the ribbon part 12 is made of a material for maintaining a curved face shape of the parabolic reflector even when the ribbon part 12 is wound from the outer circumference toward the center part 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a parabolic reflector, and more particularly to a parabolic reflector that can not only form a highly accurate parabolic surface when deployed, but also can reduce the size during storage.

  As a broadcasting satellite or communication satellite antenna, a parabolic antenna provided with a parabolic reflector is often applied to ensure directivity. However, the parabolic reflector needs to have a structure that can be folded into a small size so that it can be stored in the fairing of the rocket when launched by a rocket, and can be deployed in a correct parabolic shape when used in outer space.

  In addition, an assembly-type parabolic antenna is also used in an SNG (Satellite News Gathering) apparatus that transmits news from a site to a broadcasting station, a newspaper company, etc. via a satellite in order to facilitate transportation and storage.

  For this reason, various types have been proposed as foldable parabolic reflectors (see, for example, Non-Patent Document 1 and Non-Patent Document 2).

  The deployable reflector disclosed in Non-Patent Document 1 stretches a gold-plated molybdenum mesh on the top surface of a cylindrical truss structure, and stretches a net having Kepler triangles as basic segments on the top and bottom surfaces of the mesh, The upper and lower nets are tensioned with wires, and the upper surface has a parabolic shape.

As shown in FIG. 8, the parabolic reflector disclosed in Non-Patent Document 2 is made of a triaxial weave of carbon fiber, and by applying tension that attracts both ends of one diameter to about half of the diameter. It is possible to reduce. Release the tension during use to return the parabolic reflector to its original shape.
MW Thomson, “ASTROMESH Deployable Reflectors for Ku- and Ka-Band Commercial Satellite” 20th AIAA International Communication Satellite Systems, AIAA-2002-2003, 2002 LT Tan and S. Pellegrino “STIFFEND SPRINGBACK REFLECTORS” In Proc. 25th ESA Antenna Workshop on Satellite Antenna Technology, 18-20 September 2002, ESTEC, Noordwijk, The Netherland

  However, the parabolic reflector described in Non-Patent Document 1 has a problem that it cannot form a highly accurate parabolic surface when deployed.

  That is, in the parabolic reflector described in Non-Patent Document 1, since the parabolic surface is approximated by an aggregate of triangles, a regular error occurs in the parabolic surface. Therefore, when this parabolic reflector is used as a transmitting antenna, a grading lobe is generated at a specific position, and not only the radio wave intensity in a desired direction is reduced, but also a radio wave is radiated in an undesired direction. It will be.

  On the other hand, although the reflecting mirror described in Non-Patent Document 2 can obtain a highly accurate parabolic surface, it can be folded only within a range in which the carbon fiber exhibits a restoring force in order to maintain a developing force. There was a problem.

  The present invention has been made in order to solve the conventional problems, and provides a parabolic reflector that can not only form a highly accurate parabolic surface when deployed, but also can reduce the size during storage. With the goal.

  The parabolic reflector according to the present invention includes a substantially circular center portion, a ribbon portion that can be spirally developed on the outer periphery of the center portion, and a ribbon portion that extends radially from the back surface of the center portion and is unfolded from the back surface. A parabolic reflector including a supporting structure for supporting the structure, wherein the ribbon portion is made of a material that maintains the curved shape of the parabolic reflector even when the ribbon portion is wound from the outer periphery toward the central portion. doing.

  With this configuration, not only a highly accurate parabolic surface can be formed during deployment, but also the size during storage can be reduced.

  The parabolic reflector according to the present invention has a configuration in which the ribbon portion includes a fastener that engages with an inner member when the ribbon portion is unfolded.

  With this configuration, a highly accurate parabolic surface can be formed during deployment.

  In the parabolic reflector according to the present invention, the fastener slider travels on the fastener from the inside to the outside when the ribbon portion is unfolded, and from the outside to the inside when the ribbon portion is wound up. It has the structure which is a self-propelled type which drive | works a fastener.

  With this configuration, the ribbon portion can be automatically expanded and wound.

  In the parabolic reflector according to the present invention, the ribbon portion includes a fastener that engages with an inner member when the ribbon portion is unfolded, and the support structure is a notch formed in an element of the fastener when the fastener is engaged. It has the structure provided with the engaging part engaged with.

  With this configuration, the shape of the parabolic reflecting mirror surface can be maintained even when automatically developed.

  In the present invention, the parabolic reflector is constituted by a substantially circular center part and a ribbon part that can be spirally developed on the outer periphery of the center part. A parabolic reflector that can be reduced in size can be provided.

  Hereinafter, embodiments of a parabolic reflector according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the parabolic reflector 1 according to the present invention includes a substantially circular central portion 11 and a ribbon portion 12 that can be spirally developed on the outer periphery of the central portion 11.

  The ribbon portion 12 is made of a material that maintains the curved shape of the parabolic reflector 1 even when wound from the outer periphery toward the central portion 11.

  As a material for manufacturing the parabolic reflector 1 according to the present invention, it is desirable to use a triaxial woven fabric of carbon fibers.

  FIG. 2 is a perspective view (a) during winding of the ribbon portion 12 of the parabolic reflector 1 according to the present invention, and a perspective view (b) when the winding is completed.

  As shown in FIG. 3, the ribbon portion 12 includes a fastener that engages with an inner member that is the central portion 11 or the inner ribbon portion 12 when the ribbon portion 12 is deployed.

  The fastener includes an inner element 14 that is attached to the central portion 11 or the inner ribbon portion 12 that is an inner member of the parabolic reflector 1 via an inner tape portion 13, and an outer portion that is attached to the ribbon portion 12 via an outer tape portion 15. The element 16 includes a slider 17 that engages or releases the inner element 14 and the outer element 16.

  When a power source such as a micromotor is mounted on the slider 17 of the fastener, and the slider 17 is unfolded from the parabolic reflector 1 when the ribbon portion 12 is unfolded, the ribbon portion 12 is wound around the fastener. If it is a self-propelled type that travels on the fastener from the outside to the inside, the deployment and winding of the ribbon portion 12 can be automated.

  As shown in the rear view of FIG. 4, the parabolic reflector 1 according to the present invention includes a support structure 41 that extends radially from the back surface of the central portion 11 and supports the ribbon portion 12 after deployment from the back surface. It is desirable to securely hold the shape of the parabolic reflector 1.

  The support structure 41 includes an expansion / contraction mechanism that extends to the outside of the central portion 11 when the ribbon portion 12 is expanded, and contracts within the central portion 11 when the ribbon portion 12 is wound. This is advantageous in reducing the size of the parabolic reflector 1 according to the present invention when not in use.

  The telescopic structure may be a folding structure such as a folding umbrella or a nested structure such as a rod antenna. Furthermore, it is desirable that the stretchable structure can be automatically stretched.

  In particular, when the fastener is a self-propelled type, it is desirable to adopt the following structure so as to automatically engage with the support structure 41 when the ribbon portion 12 is unfolded.

  That is, in the ribbon portion 12 of the parabolic reflector 1 according to the present invention, as shown in FIG. 5, the support structure 41 engages with a notch formed in the fastener element when the fastener is engaged. Is provided.

  6 is an enlarged view of the fastener portion, and FIG. 7 is an XX cross-sectional view.

  Engaging portions 42 are attached to the support structure 41 at a predetermined interval.

  The inner element 14 and the outer element 16 of the fastener are formed with an inner notch 141 and an outer notch 161 that form holes when they are engaged with each other at predetermined intervals.

  When the slider 17 travels in the direction of closing the fastener and the inner element 14 and the outer element 16 are engaged, the inner notch 141 and the outer notch 161 form a hole, and the engaging portion 42 is formed in the hole. Embrace. Since the top of the engaging portion 42 is large, the ribbon portion 12 is fixed to the support structure 41 when the fastener is closed.

  The slider 17 needs to have a structure that travels across the engaging portion 42.

  As described above, according to the parabolic reflector according to the present invention, the parabolic reflector is configured by the substantially circular central portion and the ribbon portion that can be spirally developed around the outer periphery of the central portion. In addition to forming an accurate parabolic surface, the size during storage can be reduced.

  As described above, the parabolic reflector according to the present invention is effective not only for forming a highly accurate parabolic surface when deployed, but also for reducing the size during storage, and is effective as a parabolic antenna or the like.

It is a front view of the parabolic reflector according to the present invention. It is a perspective view at the time of winding of the ribbon part of the parabolic reflector which concerns on this invention. It is an enlarged view of the fastener attached to the ribbon part of the parabolic reflector which concerns on this invention. It is a rear view of the parabolic reflector according to the present invention. It is a front view (the 2) of the parabolic reflector which concerns on this invention. It is an enlarged view (the 2) of the fastener attached to the ribbon part of the parabolic reflector which concerns on this invention. It is XX sectional drawing of the fastener attached to the ribbon part of the parabolic reflector which concerns on this invention. It is the front view and side view of the conventional parabolic reflector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Parabolic reflector 11 Center part 12 Ribbon part 13 Inner tape part 14 Inner element 15 Outer tape part 16 Outer element 17 Slider 41 Support structure

Claims (4)

Parabolic reflection including a substantially circular center portion, a ribbon portion that can be spirally developed on the outer periphery of the center portion, and a support structure that extends radially from the back surface of the center portion and supports the ribbon portion after deployment from the back surface. A mirror,
A parabolic reflector made of a material that maintains the curved shape of the parabolic reflector even when the ribbon portion is wound from the outer periphery toward the central portion. The parabolic reflector according to claim 1, wherein the ribbon portion includes a fastener that engages with an inner member when the ribbon portion is deployed. The slider of the fastener is a self-propelled type that travels on the fastener from the inside to the outside when the ribbon portion is unfolded, and travels on the fastener from the outside to the inside when winding the ribbon portion. The parabolic reflector according to claim 1. The ribbon portion includes a fastener that engages with an inner member when the ribbon portion is deployed,
The parabolic reflector according to claim 1, wherein the support structure includes an engaging portion that engages with a notch formed in an element of the fastener when the fastener is engaged.

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