JPH0568109U - Deployable parabolic antenna - Google Patents

Abstract

(57) [Abstract] [Purpose] High storage efficiency and high pointing accuracy,
Also, an extremely lightweight large-diameter deployable parabolic antenna that has high reliability in deployment is obtained. [Structure] A plurality of hoops 1 that expand and maintain a shape and support a mesh mirror surface 4 and a mast 3 having an extension function that supports the hoops and a sub-reflector are mounted on a center hub 5.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a deployable parabolic antenna that simplifies the deploying mechanism and the extending mechanism to achieve a high degree of weight reduction, reliability improvement, and high storage capacity.

[0002]

[Prior Art]

 9 (a) and 9 (b) are diagrams showing a conventional deployable parabolic antenna shown in the journal "Large Space Systems Technology" (1981), in contrast to the deployable antenna, where 1 is a hoop. Reference numeral 2 is a wire that supports the hoop, 3 is an extending mast, 4 is a mesh mirror surface, and 14 is a wire that supports the mesh. FIG. 10 is a diagram showing a stored state, and FIGS. 11 (a) and 11 (b) and FIGS.

The conventional deployable parabolic antenna is configured as described above, and the retractable mast 3 that was constrained by the lock mechanism during storage not shown in FIG. 9 is unconstrained by a command from the ground. Begin extension. Then, the hoop 1 is similarly expanded, and the hoop 1 is supported by the wire 2 extending from the mast. The mesh mirror surface 4 maintains the shape as an antenna mirror surface by the hoop 1 and the wire 14 that supports the mesh.

[0004]

[Problems to be solved by the device]

 Since the conventional deployable antenna is configured as described above, if the size is increased in the future, the shape cannot be maintained unless the number of wires supporting the mesh is increased, and the wires do not get entangled. It is necessary to consider not to apply tension and to give tension, and a large hoop needs a large number of hoop deployment mechanisms, and various deployment mechanisms such as the mast extension mechanism are complicated. There was a problem such as becoming

The present invention has been made in order to solve the above-mentioned problems, and the cost extension, reliability improvement, weight reduction, and directivity can be achieved by simplifying the extension, deployment, and positioning mechanism of the mast. The objective is to obtain a deployable antenna with high accuracy.

[0006]

[Means for Solving the Problems]

 The deployable antenna according to the present invention deploys by injecting a gas and supports a plurality of hoops that support the mesh mirror surface while maintaining its shape through wires, and a mast that supports a power feeding unit or a sub-reflecting mirror. In addition, it uses a mast that converts the rotational force of the motor into an extension force by a gear and a pan tag, then extends it and positions it with a guide.

Further, a mast that extends by a thruster and is positioned by a guide is used as a mast that supports the power feeding portion or the sub-reflecting mirror.

[0008]

[Action]

 The deployable antenna in this invention deploys by injecting gas and uses multiple hoops that maintain their shape, eliminating the wires that support the mesh mirror surface, making the deploying mechanism of the hoop very simple. In addition, the mast that supports the power supply unit or the sub-reflector is a mast with a very simple structure in which the rotational force of the motor is converted into an extension force by the gear and pantograph and extended, and the guide is positioned. You can This makes it possible to obtain a deployable antenna that is extremely simple and has high reliability, pointing accuracy, and storability even if the antenna becomes large.

Further, the mast supporting the power feeding unit or the sub-reflecting mirror can be a mast having a very simple structure which is extended by the thruster and positioned by the guide. This makes it possible to obtain a deployable antenna that is very simple and has high reliability, pointing accuracy, and storability even if the antenna becomes large.

[0010]

【Example】

 Example 1. An embodiment of the present invention will be described below. Fig. 1 shows the state after deployment, Fig. 2 shows the state in which the mast has begun to extend from the stored state, and Fig. 3 shows the state during antenna deployment in which the hoop has also started to deploy at the same time as the mast. 4 is a sectional view of the extension mast, and FIG. 5 is a detailed view of the positioning guide. In the figure, 1 is a plurality of hoops that expand by gas injection to maintain their shape, 2 is a wire that supports the above hoops, 3 is a power supply unit or a support structure for a sub-reflector. There is an extension mast that supports the wire, 4 is a mirror mesh that forms the antenna mirror surface, 5 is a part of the mirror mesh and a center hub that supports the extension mast, and 6 is the extension energy of the extension mast. A motor to be supplied, 7 is a gear for transmitting the force of the motor 6, 8 is a pantograph for extending the extension mast 3 by the force from the gear 7, and 9 is a guide for positioning 3.

In the deployable antenna according to the present invention, the extension mast 3 and the hoop 1 are held by a holding mechanism (not shown) when stored. By the command, the lock mechanism of the extension mast is first released, and the motor 6 starts rotating, and the force is transmitted to the pantograph 8 via the gear 7 and the extension mast 3 starts the extension as shown in FIG. . When the extension mast 3 is extended to some extent, the holding mechanism not shown in the figure is released by a command, the restraint of the hoop 1 is released, and gas is supplied to each mast 1 from a gas generation source not shown in the figure. A valve (not shown in the figure) for injecting is opened by a command, gas flows into the hoop 1, the hoop 1 starts to expand, and the specular mesh 4 attached to the hoop 1 also starts to expand. The expansion of the hoop is done by the gas pressure at which the gas is injected. The hoop 1 is unrolled by itself and is pulled up through the wire 2 as the extension mast 3 is extended at the same time when the hoop is opened. When the extension mast 3 is completely extended, the locking mechanism (not shown) locks the mast 3 in the extension state, and at the same time, the gas injection valve (not shown) is closed. The extension mast 3 is positioned between the lower and upper stages of the mast at the final stage of extension by a guide 9 composed of a taper and a fitting portion provided on the upper outer side of the lower stage of the mast and the inner lower end of the upper stage as shown in FIG. I do. A detailed view of the portion of the guide 9 of the mast 3 after completion of extension is shown in FIG. Also, with respect to each hoop 1, when the gas has been expanded to a predetermined size, the gas injection is stopped, and a valve (not shown) is closed to seal the gas in the hoop 1, Keep the shape. As a result, the expanded state as shown in FIG. 1 is reached.

Example 2. In the first embodiment, the motor 6 rotates and the pantograph 8 operates via the gear 7 to extend the mast 3. However, in the present embodiment, the same force is applied by the thruster 10 as shown in FIG. Can be expected to operate. A detailed view of the positioning guide 9 in this embodiment is shown in FIG.

[0013]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

By using a plurality of hoops that expand by injecting gas and maintain their shape, the mirror-like mesh is maintained to eliminate the mirror-supporting wire, and a simple deployment mechanism provides high storage. The mast is extended using a motor and an extension mechanism consisting of a gear and a pantograph, and the guide is used for positioning to reduce the weight of the extension mechanism, increase its reliability, and increase its position. As a result, it is possible to obtain high accuracy, and as a deployable antenna, it is possible to achieve high storability, high reliability, high pointing accuracy, weight reduction, and cost reduction.

Further, since the extension of the mast is performed by using the thruster and the positioning is performed by the guide, the extension mechanism can be reduced in weight, highly reliable, and highly accurate in position. As a deployable antenna, it has high storability. The advantages are that high reliability, high pointing accuracy, weight reduction, and cost reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a diagram showing a developed state of an embodiment of the present invention.

FIG. 2 is a view showing a state in which the extension mast of one embodiment of the present invention has started extension.

FIG. 3 is a view showing a hoop and an extending part of an extending mast according to an embodiment of the present invention.

FIG. 4 is a sectional view of the mast according to the first embodiment of the present invention.

FIG. 5 is a detailed view of a mast positioning guide according to the first embodiment of the present invention.

FIG. 6 is a sectional view of a mast according to a second embodiment of the present invention.

FIG. 7 is a detailed view of a mast positioning guide according to the second embodiment of the present invention.

FIG. 8 is a view showing a different embodiment of the present invention.

FIG. 9 is a diagram showing a developed state of a conventional example.

FIG. 10 is a diagram showing a stored state of a conventional example.

FIG. 11 is a diagram in the middle of development of a conventional example.

FIG. 12 is a diagram in the middle of development of a conventional example.

[Explanation of symbols]

 1 hoop 2 hoop support wire 3 mast 4 mesh mirror surface 5 center hub 6 motor 7 gear 8 pantograph 9 guide 10 thruster 11 sub-reflector 12 feeder 13 truss 14 mesh support wire

Claims (2)

[Scope of utility model registration request] 1. A plurality of hoops for expanding and maintaining a shape,
Deployed prior to the hoop, after deployment, a mast that supports the sub-reflector or the power supply, one end is fixed to the hoop, the other end is fixed to the mast, the wire that supports the hoop, the A deployable parabolic antenna comprising a motor for extending the mast, a gear and a pantograph for converting the rotational force of the motor into the extension force of the mast, a guide for positioning the mast, and a mesh mirror surface supported by the hoop. . 2. A plurality of hoops that expand and maintain a shape,
Deployed prior to the hoop, after deployment, a mast that supports the sub-reflector or the power supply, one end is fixed to the hoop, the other end is fixed to the mast, the wire that supports the hoop, the A deployable parabolic antenna comprising a thruster for extending the mast, a guide for positioning the mast, and a mesh mirror surface supported by the hoop.