JPS62296603A - Method and apparatus for expanding folded type parabolic antenna reflection mirror - Google Patents

Abstract

PURPOSE:To simplify the expanding mechanism and to improve the containing performance by adopting the constitution that the lengthwise direction of a split reflection mirror face does not pass the center of a central reflection mirror face and the folded reflection mirror face is expanded in said direction. CONSTITUTION:Each end of plural split reflection mirror faces 12 provided radially around a central mirror face 11 is supported freely turnably by a supporting shaft provided to the mirror face 11 in a direction at the circumferential ridge of the mirror face 11. The mirror face 12 is arranged radially in the oblique state so that the lengthwise direction of the mirror face 12 does not pass through the center of the mirror face 11 and its free end is supported by a hold means 15 provided to a hold base 14 while being folded. The mirror faces 12 are expanded, synchronizingly unidirectionally without mutual interference by a torque delivered to each supporting shaft around each supporting shaft through the release of the means 15. Thus, the expansion mechanism is simplified and the containing performance is improved.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention provides a plurality of divided reflective mirror parts disposed on the peripheral edge of a circular central reflective mirror part via support shafts. The present invention relates to an improvement in a method and device for deploying a parabolic antenna reflector, which is suitable for use on board an artificial satellite, and which can be deployed from a folded state to obtain a parabolic antenna reflective mirror surface.

[Conventional technology]

In recent years, the demand for communication systems using satellites has been increasing, and the development of large-capacity antenna systems has become urgent. In order to realize this large-capacity antenna system, it is necessary to have an antenna with a high external precision, a good fit, and a large diameter. Although the development of highly rigid composite materials has made it possible to significantly improve the external precision, there are certain constraints on the size of the antenna when used in space flight systems such as the space shuttle and the space shuttle. In order to overcome this restriction, the antenna can be folded during the launch stage and unfolded only after entering the orbit of the satellite.Such a deployable reflector has two There are two types: one is a net-type reflector, and the other is a solid-type reflector.Due to the structure of the former, it is difficult in principle to construct a highly accurate reflecting surface.

Furthermore, various forms of the latter solid form are known. For example, LSST 1st Anna
lTechnical Review ”Adva
nced Sunflower Antenna
”Concept Development 1979
．． 11. 7 to 8, and JP-A-58-25701 "Foldable Antenna Reflector".

In the former type, the parabolic reflecting surface is divided into segments of different shapes, so the deployment mechanism is complicated and the storage efficiency is not very good.

[Problem that the invention seeks to solve]

The latter "foldable antenna reflector" type antenna has good storage efficiency in principle and can achieve storage efficiency that exceeds the former, but it requires a complicated structure. That is, this type of antenna was
Referring to Japanese Patent No. 8-25701 and referring to FIGS. 15(a) to 15(c), a large number of folding segments (5) are provided around the center panel (3) so as to be freely unfoldable. Each of these segments (5)...
... are interconnected by a connecting bar (7) via pivots (6), (8), and when the reflector is expanded, the connecting bar (7) separates the individual folding segments (5). It is configured to guide and fix in the final position.

Therefore, if we look at the process from the folded state to the unfolded state of the folding segment (5), we can see in Figure 15 (
In the process of transitioning from the open state to the half-open state shown in FIG. 15 (b), these folded segments (5)...
- As the angle of inclination of these antennas with respect to the center gradually decreases from a large state, the distance between the folded segments (5) inevitably increases. The same applies to the process from the state shown in FIG. 15(B) to the fully open state shown in FIG. 15(C).

This means that each folding segment (5)
10. ..., as the state of FIG. 15(A) shifts to FIG. 15(B), the rotation around the axis in the substantially tangential direction to the outer circumference of the antenna and the rotation around the axis in the radial direction of the antenna. This method has drawbacks such as the fact that it requires independent rotational movements in two directions, and the mechanism for synchronizing these rotational movements becomes more complex.

[Means for solving problems]

The present invention improves the above-mentioned conventional drawbacks, and provides a method and device for deploying a folding parabolic antenna that has a relatively simple structure, good storage efficiency, and high reliability.

That is, to explain with reference to FIGS. 1 to 14, at the peripheral edge of the central reflective mirror surface section (11), a plurality of divided reflective mirror surface sections (12) are provided radially around the central reflective mirror surface section (11). )... each one end of which is a support shaft (13)... provided on the central reflective mirror surface portion (11).
... are rotatably supported in one direction by..., and the longitudinal direction of the plurality of divided reflecting mirror sections (12) extends from the center of the central reflecting mirror section (11). 6 are arranged radially in an oblique state so as not to pass through, and from the folded state of the plurality of divided reflecting mirror parts (12), each of the above-mentioned support shafts (13)... By deploying synchronously in one direction using . . . as a fulcrum, these split reflecting mirror portions (12) can be deployed without interfering with each other.

and a central reflective mirror surface portion (11), and a plurality of divided reflective mirror surface portions (12) provided radially around the central reflective mirror surface portion (11) at its peripheral portion;
A holding base part (14) for holding the divided reflective mirror part, which is provided to protrude in front of the center of the central reflective mirror part (11), and each of the divided reflective mirror parts (12)... Each free end side is pivotally supported so as to be rotatable in one direction, and these divided reflecting mirror surfaces (1
2) The longitudinal direction of the center reflecting mirror surface portion (1
Support shafts (13) are distributed at equal pitches in an oblique direction that does not pass through the center of 1), and with these support shafts (13) as fulcrums, Holding means <15) for holding each divided reflective mirror surface section (12) on the holding base section (14), and divided reflective mirror surface section (12) that is expanded by releasing the holding means (15). )... is provided with a first synchronization release means (16) for synchronizing the development of all the divided reflective mirror sections (12)... be.

The first synchronization release means (16) also includes first and second pulleys (24) and (25) interlocked with the spindle (13) of the split reflecting mirror surface section (12), and the first synchronization release means (16). Bunily (24) and the other split reflecting mirror part (12) adjacent to
), or a belt (26) that connects the second pulley (25) of
) and an intermediate gear (29) that connects the gear (27) that is interlocked with the gear (27) and the gear (28) of the other adjacent divided reflective mirror section (12).
It is also possible to have a configuration including the following.

Further, the holding means (15) holds the split reflecting mirror surface portion (1
2) 80. In order to engage and hold the free end side of the . Fitting tool (18) and these engaging tools (18)
Each catcher holds the first wire (19) in a state in which the engaging part (18a) holds the free end side of the split reflective mirror part (12) while pulling the first wire (19).
(17) and these multiple catchers (17)...
...a second wire (20) that extends continuously between the two and is indirectly connected to the first wire (19), and at one end (20a) of the second wire (20), a wire holder (21) having a function of holding and releasing the wire;
A fixture (23) is provided for fixing the other end (20b) of the second wire (20) through a tensile member (22) that acts to tension the second wire (20), When the holding of the second wire (20) is released, the second wire (20) is released due to the action of the tension member (22).
wire (20) is pulled, and at the same time, the tension of each of the first wires (19), which was in a tensioned state, is released, and the respective divided reflective mirror portions (of each of the engagement tools (18) 12) are released at the same time.

Furthermore, the neck portion (3
0a) is rotatable and one end is pivotally supported on the outer circumference side end of this ridgeline part (12a), and the sliding member (30) is adjacent to the direction opposite to the deployment direction of the divided reflective mirror part (12). The middle part loosely fits into the sliding member (30) of the adjacent divided reflective mirror surface part (12), and the other end fits into the sliding member (30) of the divided reflective mirror surface part (12) that is in contact with the divided reflective mirror surface part (12).
Engagement tool (18) for the hold handle held at the same time
and a biasing means such as a spring (32) that biases the respective links (31) to rotate in the deployment direction of the split reflective mirror portion (12). By releasing the holding means (15), the holding of the one end of each link (31) is released, and the respective balls are simultaneously expanded by the expanding force of the respective intervening mirror surface portions (12). Glue 7, (31) and Yawadare. 49 parts flour. . ),)Yugan,.

A second synchronization release means plate is provided for synchronously deploying each of the divided reflective mirror surface parts (12) by braking the divided reflective mirror surface parts (12).

[For production]

However, the split reflecting mirror section (
12)...1. ... is in the completely folded state as shown in Fig. 3 (a), the holding means (1
When the hold in 5) is released, the split reflecting mirror surface part (12)
... is deployed and driven in one direction using its support shaft (I3) as a fulcrum.

As a result, these divided reflecting mirror portions (12)...
・will gradually develop as shown in Figures 3 (a) to (d). In other words, the split reflecting mirror section (12) held by the holding means (15) while folded in the open state shown in Fig. 6 is held by the ground station or artificial When a signal to the antenna is received from inside the satellite, the holding of the wire holder (2) by the wire holder (2) is released, and at the same time, this second wire (20) is released by the action of the tension spring (22). It is pulled considerably by. Then, the indirectly connected first wires (19) are pulled out in the direction of arrow a in FIG. The engagement state with respect to each split reflecting mirror surface portion (12) and link (31) is simultaneously released.

Next, the divided reflective mirror surface portion (12)... is the first
They are released synchronously by the synchronization release means shown in FIG. 1 (a) or (b).

That is, in the case shown in FIG. 11(a), the movement of the second pulley (25) in conjunction with the rotational movement of the spindle (13) of the split reflecting mirror section (12) causes the belt (26) to move. As a result of rotating the first pulley (24) of another divided reflective mirror surface section (12) adjacent to the divided reflective mirror surface section (
12)... develops synchronously. Furthermore, the 11th
According to what is shown in FIG.
) to the gear (28) on the other adjacent split reflecting mirror section (12). Therefore, one divided reflective mirror surface section (12) is connected to another divided reflective mirror surface section (12) adjacent to the divided reflective mirror surface section (12).
Expand in sync with.

On the other hand, on the free end side of the divided reflective mirror surface portions (12), the respective links (31) are released by releasing the holding means (15), and the respective divided reflective mirror surface portions ( 12) due to the deployment force via the support shaft (13), and at the same time due to the continuous geometric expansion due to the loose fit between each of the links (31) and each sliding member (30)... Due to mutual braking action of the divided reflective mirror surface parts (12), each of the divided reflective mirror surface parts (12)
) synchronously.

(Example) An example of the present invention shown in the drawings will be described below. As shown in FIGS. 11(a) and 11(b), the central reflective mirror surface (11) (hereinafter referred to as "mirror surface portion (11)") formed in a circular sawtooth shape has a central reflective surface (11) formed in the shape of a circular sawtooth. A total of 24 saw-toothed portions (11a) are provided at equal pitches. This sawtooth (
lla)..., respectively, have a split reflecting mirror section (12)... [hereinafter mirror section (12)...], which will be described later.
...] is provided with a support shaft (13) so that it can rotate using one end thereof as a fulcrum.

The support shaft (13)... is the mirror surface portion (11)
A mirror surface part (12) around an axis approximately tangential to the outer circumference of
. . . is provided so that its longitudinal direction does not pass through the center of the mirror surface portion (11) so that it can rotate.

That is, the mirror surface portions (12) are each provided radially with respect to the mirror surface portion (11) while having a predetermined inclination angle.

The mirror surface portion (12)... exhibits a cylindrical shape as shown in FIG. 3(A) before development. This diameter (dimension D) becomes smaller as the number of mirror surfaces (12) increases, and as the inclination angle α approaches 90a as shown in FIG. be able to.

Note that as the angle α approaches 90°, the height H of the columnar shape increases. (14) is the mirror surface part (12)
. . . is a holding stand provided to hold this in a folded state, and the legs (14a) (
14a), supported by (14a). As shown in FIGS. 4 to 6, each mirror surface portion (12) is located at the antenna center of its free end side ridgeline portion (12a) with respect to the holding base portion (14). The side end portions are held by engaging tools (18) provided around the holding base portion (14) in correspondence with each of the mirror portions (12). The engaging tool (18) is provided with a hook-shaped engaging portion (18a). This engaging portion (18a
) consists of a pin (12e) protruding from the ridgeline (12a) of the mirror surface (12) and a link (
31) The pin (12C) and the pin (31a) which are loosely fitted are held together by protruding from the end. When the catcher (17) is actuated and the tension of the first wire (19), which will be described later, is released, the engagement part (18a) is released, and at the same time, the engagement part (18a) is released from the engagement part (18a) and the pin (12c) (
31a) can also be released.

As shown in FIG. 7, the first wire (19) has its terminal portion (19a) always stopped by a stopper portion (19b). In other words, the stopper portion (
19b) is the large diameter portion (20c) of the second wire (20), one end of which is held by the wire holder (21) and the other end of which is fixed to the fixture (23) via a tension member (22).
It is held in place so that it does not fall out. Then, by releasing the holding of the wire holder (21), the second wire (20
) in the direction of the arrow, the large diameter portion (20C)
moves to the point shown by the dotted line, whereby the holding by the large diameter portion (20C) of the stopper portion (19b) is released, and the first wire (19) moves in the direction of the arrow in FIG. Then, the engaging tool (18) is activated.

Next, the mirror surface part (12) released as described above...
... develops sequentially from the state shown in Fig. 4, but at this time, the first state shown in Figs. 11 (a) and (b)
In addition to the synchronization release means plate of 5. 9.10°12,1
It is developed synchronously by the second synchronization release means shown in FIG.

That is, when each of the mirror parts (12)... starts to expand, the links (31)...
As shown in Figure 2 (A) and Figure 13, the coil spring (
32), it attempts to rotate in the direction of the arrow. At this time, these links (31)...... are respectively connected to the sliding members (3) of the adjacent mirror portions (12)...
0)..., and the sliding member (30)... is such that its neck (30a) can freely rotate as described below. This structure allows the link (31) that attempts to slide on this sliding member (30) to slide freely.

However, as long as the direction of the link (31) is constant, the sliding member (30) cannot be slid against the link (31) due to its mechanism. In other words, each of the mirrored parts (12) cannot be deployed faster than the other mirrored parts (12). In other words, they develop synchronously. The sliding member (30) is shown in FIG. 9 (a).
, (b), the cylindrical part (30b) into which the link (31) is loosely fitted has an inner layer made of, for example, MoS, (
A bushing (30b') made of a coating of molybdenum disulfide (molybdenum disulfide) or a fluororesin is provided. Neck (30a
) is supported by a spherical bearing (30c), and this bearing (30c) is supported by a fixing member (1) embedded in the mirror surface (12).
2b).

In addition, instead of the sliding member (30), Fig. 10 (a)
.

As shown in (b), a sliding member (35) having a ball (35b) like a bearing without an inner ring in the inner layer and an outer ring (35a) for holding the ball may be used.

Alternatively, although not shown, it is also possible to use something like a self-aligning ball bearing in which the direction of the link (31) can be varied.

As shown in FIG. 13, the coil spring (32) is provided around the support shaft (31a) of the link (31), and this support shaft (31a) is located along the ridgeline of the mirror surface (12). The fixing member (12c) buried at the end of (12a)
) is fixed.

When the development of the mirror surface part (12) is completed,
As shown in FIG. 12(B), at the same time that each ridgeline portion (12a) of each mirror surface portion (12) is continuously connected, the support shaft (31a) of the link and the sliding member (30) Each of the held links (31) comes to fit approximately on the ridgeline (12a).

At this time, mutually adjacent mirror surfaces (12)...
As shown in FIG. 14, the latching mechanisms (33) maintain the mutual connection. This Latimo mechanism (33) is
One member is provided with a latch (33b) that can be closed easily by a spring (33a), and the other member is provided with a pin (33b).
33c), when the mirror surface portion (12) is at a predetermined position, this launch (33b) engages with the mirror surface portion (12) to lock both members, that is, the adjacent mirror surface portions to each other.

Note that the present invention is not limited to the above-described embodiments, and as shown by imaginary lines in FIG. A step motor (40) may be provided to expand the mirror portion.

In addition, at the time of completion of the expansion, the adjacent ridgeline portions of the mirror surface portions are adjusted as appropriate as shown in FIG. It is also possible to combine it with a mirror-finished part that is cut diagonally and has a ridge cut diagonally or at right angles.

〔Effect of the invention〕

According to the present invention described above, the longitudinal direction of the divided reflective mirror part does not pass through the center of the central reflective mirror part, but is tangential to the circular part of the central reflective mirror part, and is folded. Since the parabolic antenna reflecting mirror section is obtained by expanding the divided reflecting mirror section in this direction, this unfolding mechanism is extremely simplified. In other words, for one split reflecting mirror part, only one support axis in one direction is required, so as in the conventional type of this type, the longitudinal direction of the split reflecting mirror part is around the axis in the tangential direction of the antenna. and for those accompanied by two independent rotational movements of each rotation around the radial axis of the antenna,
The unfolding mechanism can be considerably simplified.

In addition, although there is a limit to the number of split reflecting mirror parts regarding the 0 dimension and 11 dimension in Figure 3 (A) in the so-called folded state, the more you increase the number, the more interference between the mirror parts (12) can be avoided. Furthermore, although there is a limit to the direction in which the mirror surface portion (12) is deployed (i.e., the direction perpendicular to the support axis (13)), it is possible to reduce the dimensions for the antenna center. The more the angle .alpha. in FIG. 1 is made as large as possible, the smaller the dimension of the mirror surface section (12) can be made. Therefore, the above and H dimensions can be appropriately selected taking into consideration the overall size of the antenna required for deployment, constraints on loading space for rockets, etc., and the center of the antenna can be Compared to the type in which the mirror surface portions (12) are provided radially as shown in FIG.

As described above, since these dimensions can be determined based on the correlation between the above-mentioned dimensions and the H dimension, it is possible to improve the storability in a rocket or the like.

Furthermore, according to the holding means according to the present invention, each mirror surface portion (
12) in a folded state, the position of each engagement tool (18) is determined by the position of the first wire (19) and the second wire (20).
), and when this tension is released, the engaging tool (18) automatically operates to achieve the purpose of holding the device until deployment, so the structure is simple and the operation is simple. becomes certain.

Further, the first synchronization release means (16) according to the present invention includes a boot IJ-
(24) and (25) are connected with a belt, or similarly gears (27) and (28) are connected through an intermediate gear (29), so the structure is extremely simple and the operation is easy. It is certain. This is effective for the support shaft (13) to generate and transmit the driving force for deploying the mirror surface section (12) itself.

Furthermore, the second synchronization release means (41) according to the present invention connects a link (31) pivotally supported at the end of the ridgeline of one mirror surface section (12) to this mirror surface section (12)... Another mirror surface part (12) adjacent to the direction opposite to the development direction of...
A swinging sliding member (
30) Since the configuration is such that the mirror portions (12) are loosely fitted into each other, each of the mirror portions (12) develops synchronously. That is, when the dimensions shown in FIG. 5 tend to increase gradually, the link (31)... is the sliding member (30)...0. It unfolds while sliding,
If the L dimension does not gradually increase, that is, if the deployment speed of only one mirror surface section becomes faster, the movement of the mirror surface section (12) is mechanically controlled by the sliding member (3).
Link (31)...,... via 0),...
Since it acts as a brake, a continuous geometric expansion is obtained, and as a result, synchronization can be achieved.

Since this is provided at the ridgeline portion of the mirror surface portion (12) where interference is likely to occur, it is quite effective, especially for items with a large folding density when folded according to the present invention. .

[Brief explanation of the drawing]

1 to 14 are diagrams showing one embodiment of the present invention, in which FIG. 1 is a plan view of the divided reflective mirror portion in an expanded state, and FIG. 2 is a side view of the expanded state in FIG. 1. Figures 3 (a) to 3 (d) are diagrams showing the movement of the split reflecting mirror section from the folded state to the unfolded state, Fig. 4 is a plan view of the parabolic antenna reflector in the folded state, and Fig. 5 is a ,
4 is an enlarged view of section A, FIG. 6 is an enlarged view of section B of FIG. 4, FIG. 7 is an enlarged sectional view taken along the line The enlarged sectional views taken along the lines ■ to ■ in the figure, Figures 9(a) and 9(b) are detailed views of section C in Figure 5, and FIG. 9(a) is an enlarged perspective view, and ) is a cross-sectional view along lines ■ to ■ in Figure 9 (a), and Figures 10 (a) and (b).
9A and 9B are views showing other embodiments corresponding to FIGS. 9A and 9B, respectively, and FIGS. 11A and 11B are enlarged views of main parts showing the first synchronization release means, respectively. FIG. 6 is a diagram showing different embodiments. FIGS. 12(a) and 12(b) are enlarged views of main parts showing the relationship between the movement of the split reflecting mirror part and the link in the second synchronization release means, and FIG. 13 is part D of FIG. 12(a). The enlarged view, FIG. 14, is an enlarged view of section E in FIG. 12(b), and FIGS. 15(a) to (c) are views showing the unfolding process of a conventional folding parabolic antenna reflector. (11)... Central reflective mirror surface section, (12)...
...Divided reflection mirror view, (12a)...Ridge line part, (13)...Spindle. (14)...Holding stand section, holder...Holding means.

Claims (7)

[Claims] (1) At the peripheral edge of the central reflective mirror surface section, one end of each of the plurality of divided reflective mirror surface sections provided radially around the central reflective mirror surface section is connected to each support provided on the back surface of the peripheral edge section of the central reflective mirror surface section. The plurality of divided reflective mirror parts are supported by a shaft so as to be rotatable in one direction.
They are arranged radially obliquely so that their longitudinal direction does not pass through the center of the central reflective mirror surface section, and with the plurality of divided reflective mirror surface sections folded, their free ends are provided on the holding base section. When the holding means is released, the plurality of divided reflective mirror parts are held by a rotational driving force that is mutually transmitted to each of the supporting shafts using each of the supporting shafts as a fulcrum. A method for deploying a folding parabolic antenna reflector, characterized in that the mirrors are deployed synchronously in one direction without interfering with each other. (2) a central reflective mirror surface portion, a plurality of divided reflective mirror surface portions provided radially around the central reflective mirror surface portion in this peripheral portion, and the divided reflective mirror surface portions provided to protrude in front of the center of the central reflective mirror surface portion; and a holding base for holding the part, and each of the divided reflective mirror parts is pivotally supported so that each free end thereof can rotate in one direction, and These split reflecting mirrors have supporting axes distributed at equal pitches in an oblique direction so that the split reflecting mirror does not pass through the center of the central reflecting mirror surface, and each split reflecting mirror is folded using these supporting axes as fulcrums. A holding means for holding the mirror part on the holding base part, and a synchronization release means for synchronizing the deployment of all the divided reflective mirror parts so as to synchronously deploy the divided reflective mirror parts by releasing the holding means. A device for deploying a folding parabolic antenna reflector. (3) The folding parabola according to claim 2, characterized in that the longitudinal direction of the divided reflective mirror surface portions is provided to rotate around an axis that is substantially tangential to the outer periphery of the central reflective mirror surface portion. Antenna reflector deployment device. (4) The holding means is a plurality of holding means provided corresponding to each divided reflective mirror surface portion at the peripheral edge of the holding base so as to engage the free end side of the divided reflective mirror surface portion in a folded state. a first wire that acts on each of the engagement parts so that the engagement parts of these engagement parts maintain the state in which the free end side of the split reflective mirror part is maintained; a second wire that continuously extends between the plurality of catchers and is indirectly connected to the first pull wire; A wire holder having a function of holding and releasing the wire at one end thereof, and a fixture that fixes the second wire through a tensioning member that acts to pull and tension the other end of the second wire, When the second wire is released from being held by the wire holder, the second wire is
wires are pulled, and at the same time, the tension of each of the first wires, which were in a tensioned state, is released, so that the engagement state of each engagement tool with each of the divided reflective mirror parts is simultaneously released. A folding parabolic antenna reflector unfolding device according to claim 2, characterized in that: (5) The synchronization release means is a belt that connects the first and second pulleys that are interlocked with the support shaft of the divided reflective mirror section and the second pulley of another divided reflective mirror section that is adjacent to the first pulley. 3. A folding parabolic antenna reflector deployment device according to claim 2, comprising: (6) The synchronization release means includes an intermediate gear that connects a gear interlocking with the support shaft of the divided reflective mirror surface section and a gear of another adjacent divided reflective mirror surface section. 2. A device for deploying a folding parabolic antenna reflector according to item 2. (7) The synchronization release means includes a sliding member whose neck is rotatable and which is fixed to the center of the free end side ridgeline of each divided reflective mirror surface, and whose one end is pivoted at the outer peripheral side end of this ridgeline. holding means whose intermediate portion loosely fits into a sliding member of an adjacent divided reflective mirror surface section in a direction opposite to the unfolding direction of the divided reflective mirror surface section, and whose other end simultaneously holds another divided reflective mirror surface section; comprising each link held by the engagement tool and a biasing means such as a spring that biases each link to rotate in the deployment direction of the split reflective mirror section;
By releasing the holding means, the holding of the one end of each link is released, and at the same time, each divided reflective mirror part is expanded by the deployment force, and the divided reflective mirror part is expanded by the loose fitting of each link and each sliding member. 3. The unfolding device for a folding parabolic antenna reflector according to claim 2, wherein each of the divided reflecting mirror surfaces is unfolded synchronously by mutual braking action.