JP2014189145A - Dropping device and dropping method of space structure for revolving around the earth to the earth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dropping device (a method) capable of making a mission-finished space structure drop and disappear toward the earth in an early stage.SOLUTION: A thin film 11 and a convex tape 25 are wound around the central axis 21 inside a case 20 to be reduced and stored in a storage part. When space structure-dropping time arrives, the thin film 11 and the convex tape 25 are made to escape from the case 20 by a command from a command part, and the thin film 11 is largely spread and expanded in a space by extending the convex tape 25 by spring force of itself. Thus, an earth-revolving speed of the space structure is gradually reduced by gas resistance of a gas existing in the space in an extremely low concentration received by the thin film 11, and the space structure is dropped toward the earth and is made to burn up and disappear by frictional heat with the atmosphere in atmosphere entry time.

Description

  The present invention relates to an apparatus and a method for dropping a space structure on the earth for dropping a space structure that circulates in an orbit of outer space over the earth toward the earth at a desired time.

  Space structures such as artificial satellites (hereinafter also simply referred to as “satellite”) that are launched from the earth into space and orbit in the outer space of the earth continue to orbit the earth after the mission ends. For this reason, the number of satellites that have completed missions orbiting outer space over the earth has been increasing year by year, and in the future there is a risk of hindering the use of other satellites as space waste. However, a technique for dropping a satellite that has completed a mission to the earth and extinguishing it has not yet been established, and it is expected that the above-mentioned fear will increase in the future.

  Accordingly, an object of the present invention is to provide an apparatus and method for dropping a space structure onto the earth that can quickly drop a satellite that has completed a mission to the earth and extinguish it.

  More details are as follows. Since a satellite launch vehicle requires a large amount of fuel, it is necessary to reduce the size and weight of the satellite as much as possible, and it is natural to reduce the size and weight of the earth drop device installed in the satellite. Accordingly, an object of the present invention is to realize an apparatus and a method for dropping a space structure orbiting the earth that can be reduced in size and weight.

  In addition, since the device for falling to the earth is operated after the mission has been completed for a long time after launching the satellite, the satellite is dropped toward the earth, so even if many years have passed since the launch. High reliability that can be operated is required. Therefore, an object of the present invention is to realize an apparatus and a method for dropping a space structure orbiting the earth that can ensure such high reliability.

  An apparatus for dropping a space structure that orbits the earth according to claim 1 includes a reduced thin film and a deployment means for deploying the thin film, and operates the deployment means in response to a command from the commanding unit. It is characterized by being expanded and expanded in outer space.

  Preferably, in the apparatus for dropping a space structure orbiting the earth to the earth according to claim 2, the expanding means is a convex tape.

  In the method of dropping a space structure that orbits the earth according to claim 3, when it is time to drop the space structure, the thin film is expanded and expanded in space by a command from the command unit, The space structure is gradually lowered by the gas resistance of the thin gas in the outer space received by the thin film, causing the space structure to fall toward the earth, and the space structure is burned out by frictional heat with the atmosphere. It is characterized by being extinguished.

  According to a fourth aspect of the present invention, there is provided a device for dropping a space structure that circulates the earth onto the earth, a storage unit provided in the space structure, a central axis provided in the storage unit, and respective tip portions thereof are mutually connected. A thin film and a convex tape which are coupled and wound around a central axis and are stored in a reduced size inside the storage unit; and an escape means for allowing the thin film and the convex tape to escape from the storage unit. It also serves as an extension preventing means that prevents it from extending due to its own spring force, and the convex tape is extended by its own spring force by causing the thin film and the convex tape to escape from the storage portion by means of the escape means in response to a command from the command section. Thus, the thin film is expanded and expanded in outer space.

  Preferably, in the apparatus for dropping an earth structure around the earth to the earth according to claim 5, the escape means preferably urges the thin film and the convex tape to move in a direction to escape from the storage portion. It is an urging means.

  According to a sixth aspect of the present invention, there is provided a device for dropping a space structure that circulates the earth onto the earth, a storage unit provided in the space structure, a central axis provided inside the storage unit, and respective tip portions of each other. A thin film and a convex tape which are coupled and wound around a central axis and are stored in a reduced size inside the storage portion, and a biasing means for biasing the thin film and the convex tape so as to move in a direction to escape from the storage portion. An escape means for preventing the thin film and the convex tape from escaping from the storage portion against the urging force of the urging means, and a release means for releasing the escape prevention state by the escape prevention means. The storage part also serves as an extension preventing means for preventing the convex tape from extending due to its own spring force, and the release means is operated by a command from the command part to release the escape prevention state. It allows the thin film and convex tape by escape from the housing portion by the urging force of the urging means, is characterized in that deploying the thin film in space by a spring force to be extended in the convex tape.

  Preferably, in the apparatus for dropping the earth structure orbiting the earth according to claim 7, the escape prevention means preferably includes a cover member for pressing the thin film and the convex tape from above, and a cover member for the biasing means. It comprises movement preventing means for preventing the thin film and the convex tape from moving in the escape direction due to the urging force.

  The apparatus for dropping a space structure that circulates around the earth according to claim 8 is preferably configured such that the movement preventing means is a plurality of chuck bodies and a plurality of chuck bodies provided on the cover member. The upper end of the central shaft is chucked by a chuck body to prevent the central shaft from moving in the direction of escape by the biasing means, and the release means is a string. Cutting means.

  The apparatus for dropping a space structure that circulates around the earth according to claim 9 is provided in a storage unit provided in the space structure, a central axis provided in the storage unit, and in the storage unit. A rotating body that is rotatably mounted on the central axis, a stopper that engages with a locking portion at the front end of the rotating body and prevents the rotating body from rotating inside the storage unit, and the respective front ends are mutually connected. A thin film and a convex tape which are combined and are wound around a central axis with a rotating body interposed therebetween and reduced, and a thin film, a rotating body and a convex tape which are stacked in order from the top inside the storage section Evacuation means comprising urging means for urging in the direction of escaping, escaping prevention means for preventing the thin film and the convex tape from escaping from the storage portion by the urging force of the urging means, and evacuation according to instructions from the command section Activating the prevention means Escape that releases the escape prevention state and causes the thin film and the convex tape to escape out of the storage part by the biasing force of the biasing means, and the convex tape expands straight into outer space by its own spring force that tries to stretch straight. And a preventive state releasing means.

  The apparatus for dropping an earth structure around the earth according to claim 10 is preferably a claw part in which the rotating body is a claw wheel and the engaging part is provided on an outer peripheral edge of the claw wheel. It is.

  The apparatus for dropping an earth structure around the earth according to claim 11 is preferably provided, wherein the escape prevention means is provided on a cover member for pressing a thin film wound around a central axis and a convex tape, and the cover member. A plurality of chuck bodies that chuck the upper end portion of the central shaft, and a string that holds the chuck body to hold the chucked state of the upper end portion of the central shaft by the chuck body, and cancels the escape prevention state. The means is a string cutting means.

  12. The apparatus for dropping a space structure orbiting the earth according to claim 12, wherein a plurality of the convex tapes are preferably fixed in a stacked manner at one fixed location. A device for dropping a space structure that orbits the earth.

  The space structure orbiting the earth structure orbiting the earth according to claim 13 orbits the earth by the apparatus for dropping the space structure orbiting the earth according to any one of claims 4 to 12. When it is time to drop the space structure onto the earth, the thin film and the convex tape are escaped from the storage portion by the escape means according to the command from the command section. The thin film expands and expands in outer space by stretching by its own spring force, and the earth structure's orbital velocity is gradually reduced by the gas resistance of the gas that exists thinly in the outer space that the thin film receives. The space structure is burned down and extinguished by frictional heat with the atmosphere.

  According to the present invention, when the mission of the satellite is completed and a desired time has arrived, the thin film that has been reduced is widely deployed in outer space by the deploying means according to the command from the command unit, and the deployed thin film is By receiving the gas resistance of the gas that exists very thinly in space, the earth's orbiting speed of the satellite is gradually reduced, and the satellite can be dropped toward the earth at an early stage. Moreover, according to the present invention, it is possible to eliminate the need for a heavy actuator such as a motor, and it is possible to realize a device and method for dropping a space structure that circulates around the earth in a compact, lightweight and highly reliable manner. .

Explanatory drawing of the space structure orbiting the earth in one embodiment of the present invention External view of space structure in one embodiment of the present invention The top view of the expansion | deployment state of the thin film of the dropping apparatus of the space structure in one embodiment of this invention 1 is a partial exploded perspective view of a space structure dropping device according to an embodiment of the present invention. The internal top view of the dropping device of the space structure in one embodiment of the present invention The sectional side view in the state where the thin film of the dropping device of the space structure in one embodiment of the present invention was shrunk The sectional side view in the state where the thin film of the dropping device of the space structure in one embodiment of the present invention developed (A) (b) Partial expanded sectional view of the vicinity of the upper end of the central axis of the space structure dropping device in one embodiment of the present invention (A) (b) Partial explanatory drawing of the space structure dropping device in one embodiment of the present invention The perspective view of the convex tape in other embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a satellite 2 orbits in the orbit of outer space above the earth 1. The earth orbit speed of the satellite is, for example, about 7.9 km / second. The satellite 2 orbits the outer space about several hundred km above the earth 1, but a very thin gas exists in the outer space about several hundred km. The present invention has been made in view of the presence of this slight gas in outer space. The gas that exists thinly in outer space here means a substance that exists slightly in the state of gas molecules, atoms, etc. in outer space, and the drag that acts against the movement direction of the satellite by these gas resistance It shall be called.

The satellite 2 is equipped with a dropping device 10. As will be described later, the dropping device 10 stores a thin film 11 or a convex tape that is reduced by being folded around a central axis and wound around the central axis. The thin film 11 is transmitted from the command unit 3 on the earth. Expands into outer space with the command The satellite 2 orbits over the earth 1 in the state shown in FIG. 1A (a state in which the thin film is reduced and stored in the storage unit), and performs missions such as meteorological observation and geographic measurement. When the mission is completed and the satellite 2 is not required, the thin film 11 is instantly spread and deployed in outer space by the above command as shown in FIG. 1B. The shape and size of the thin film 11 in the unfolded state can be arbitrarily determined. For example, the vertical and horizontal dimensions are both 2 m and an area of about 4 m ² . Below, the case where a thin film is a square is taken for an example, and the detail of a mechanism is demonstrated.

  As shown in FIGS. 1B to 1E, the satellite 2 on which the thin film 11 is deployed orbits while orbiting in various attitudes. As described above, a slightly thin gas is present in the space where the satellite flies. Exists. For this reason, the thin film 11 during navigation receives a slight gas resistance, and the orbital speed of the satellite 2 gradually decreases, and finally begins to descend toward the earth due to gravity (see arrow Z). It burns out and disappears due to frictional heat with the atmosphere. Thereby, the satellite 2 is removed from outer space.

  The period from when the thin film 11 is deployed in outer space until it falls to the earth and burns out varies depending on the mass of the satellite, the altitude, the size of the thin film, etc. is there. Thin films are known (published in S. Nasir Adeli's article “Deployment System for the CubeSail Nano-Solar Sail Mission”, “Small Satrite Conference 2010, Logan, Utah, US”).

  However, the thin film according to this paper is related to the Solar Sail system, and in the space structure that flies from the earth to other celestial bodies such as Venus, the developed thin film depends on the light pressure of sunlight received from behind. It is for accelerating the navigation speed. In contrast, the thin film of the present invention, as will be described in detail later, is for reducing the earth's orbiting speed of the satellite, and its gist, purpose, and effect are completely different from those of this paper. As the material for the thin film, for example, a film obtained by vapor-depositing both sides of a polyimide film is desirable because it can secure resistance to oxygen at atoms and resistance to ultraviolet rays.

  Next, details of the dropping device 10 will be described. FIG. 2 shows the appearance of the satellite 2 and the drop device 10 mounted on the satellite 2. As shown in FIG. 2, the dropping device 10 is mounted at an appropriate place (one surface in this example) of the satellite 2, and a thin film (described later) housed in a reduced size is stored in the command unit 3 (see FIG. 1). Expands into outer space instantaneously by the command sent from FIG. 3 is a plan view of the developed state of the thin film 11. Small holes 11a are formed at the four corners for coupling to the tip of a convex tape (described later). An opening 11b for inserting a central axis (described later) is formed at the center.

  In FIG. 2, the dropping device 10 has two semi-disc-shaped chuck bodies 12. The chuck body 12 is provided on a disk-shaped cover member 31 divided into two. The number of chuck bodies is not limited to two, and a plurality of chuck bodies may be used. The two chuck bodies 12 are strongly clamped and joined so as to hug each other by a string 13, and are integrated into a disk-like body. The string 13 is tightly wound around the chuck body 12 around its circumference, and both ends thereof are coupled to pins 14 that are stop portions provided on the satellite 2. As the material of the string 13, for example, high-tensile-resistant ultrahigh molecular weight polyethylene can be applied.

  The two bonded chuck bodies 12 are firmly attached with a string 13 so that the upper end portion of the central shaft 21 provided in the bottomed cylindrical case 20 as a storage portion as shown in FIG. Chuck. As shown in FIG. 2, a heating wire 15 is in contact with the string 13 and wired. As will be described later, when a current flows through the heating wire 15 according to a command from the command unit 3, the string 13 is cut by the heat generation, and the chuck body 12 is released from the chucked state due to the tightness of the string 13 and away from each other. The slide is laterally separated (arrow L in FIG. 7), and the chuck (locked) state by the chuck body 12 at the upper end of the central shaft 21 is released as shown in FIG. Expand to expand.

  4 to 6, a central shaft 21 is erected at the center of the bottom surface inside the case 20. The lower end portion of the central shaft 21 is attached to the bottom surface of the case 20. A ratchet wheel 22 as a rotating body is rotatably mounted on the central shaft 21 via an attachment tube 26. As shown in FIG. 5, a plurality of claw portions 22 a as a locking portion formed on the outer peripheral edge of the tip of the claw wheel 22 are stoppers 23 (FIG. 4 is also shown in FIG. 4). And the horizontal rotation in the direction of the arrow M is prevented. The stopper 23 also serves as a slide guide when the claw wheel 22 slides and moves (moves upward) in a direction (upward in FIGS. 4, 6, and 7) to escape from the inside of the case 20 to the outside. The dropping device 10 includes a lid member (not shown) that is on the case 20 and covers the chuck body 12 and the cover member 31, and the chuck body 12 is suppressed from above by the lid member.

  As shown in FIG. 4, a plurality of convex tapes 25 (four in this embodiment, one in four at a phase of 90 degrees) are attached to the lower surface side of the ratchet wheel 22 and a mounting cylinder 26 and a disk. The tape is wound in a shape sandwiched between the convex tape guides 27 and stored in a reduced size. The base end portion of the convex tape 25 is fixed to the mounting cylinder 26. The mounting cylinder 26 is inserted into the central shaft 21. Further, a fitting body 28 into which the mounting cylinder 26 is fitted is provided on the upper surface side of the ratchet wheel 22, whereby the mounting cylinder 26, the ratchet wheel 22 and the fitting body 28 are integrated when the convex tape is extended. And can be rotated freely. On the other hand, the convex tape guide 27 is fixed to the case 20 (that is, the convex tape guide 27 does not rotate relative to the case 20), whereby the extending direction of the convex tape 25 is set to a predetermined value. It is possible to control the direction.

  The convex tape 25 is a tape-like thin and long plate having a strong spring property such as a steel plate, and is a well-known tape widely used as a tape measure or the like. The convex tape 25 which has been reduced by winding has a strong spring force that tends to extend straight. If necessary, a plurality of convex tapes 25 may be mounted one on top of each other. In this way, the convex tape 25 has a higher extension strength while maintaining the degree of freedom of deformation of each convex tape alone. Securement is possible.

  In FIG. 4, the thin film 11 is folded in a tape shape and wound around the upper surface of the claw wheel 22 while being reduced. Description of a method of folding the rectangular thin film 11 as shown in FIG. 3 into a tape shape as shown in FIG. 4 will be omitted. The convex tape 25 and the thin film 11 are disposed so as to be stacked one above the other with the claw wheel 22 interposed therebetween. As shown in FIGS. 4 and 6, the upper thin film 11 and the lower convex tape 25 are stacked with the claw wheel 22 interposed therebetween, wound around the central shaft 21 and housed in the case 20. In addition, the thin film 11 and the convex tape 25 can be accommodated in a small and compact shape which is reduced in size, whereby the dropping device 10 can be made compact and compact.

  Small holes 25a and 11a are formed at the tip of the four convex tapes 25 and the corner of the rectangular thin film 11, respectively (see FIGS. 3 and 4), and the small holes 25a and 11a are joined together. They are integrally connected by a string 29 as a part (see FIG. 6). In FIG. 4, the string 29 is omitted. Since the thin film 11 is wound around the fitting body 28 and the convex tape 25 is wound around the mounting cylinder 26 and stored in the case 20 in a contracted state, the wound convex tape 25 has its own strong spring force. It also serves as an anti-extension means for preventing straight extension.

  In FIG. 5, the four strips 29 are in contact with the tapered surface of the claw portion 22 a of the claw wheel 22. As will be described later, when the ratchet wheel 22 escapes out of the case 20 and its rotation prevention state (locked state) by the stopper 23 is released, the ratchet wheel 22 can rotate in the direction of arrow M, but the string 29 Has the flexibility not to disturb this rotation.

  FIG. 6 shows a state in which the thin film 11 and the convex tape 25 are stacked with the claw wheel 22 sandwiched from above and below, wound around the central shaft 21, reduced, and stored in the case 20. FIG. 7 shows a state in which the thin film 11 and the convex tape 25 have escaped from the case 20 and developed into outer space. 5 and 6, a plurality of spring materials 30 (four in the present embodiment) made of coil springs as biasing means are provided at equal intervals in the case 20. As shown in FIG. 6, the cover member 31 described above is provided on the thin film 11 as a pressing member. The cover member 31 strongly presses the spring material 30 composed of a coil spring as an urging means in a compressed state, and the string 13 keeps this compressed state (a state in which the upper end portion of the central shaft 21 is firmly chucked) as described above. The two chuck bodies 12 are firmly joined to each other and firmly fixed so as not to be separated from each other and locked.

  8A and 8B, a neck detail 21 a is formed at the upper end of the central shaft 21. An upper end and a lower end of the neck detail 21a are tapered surfaces b, and a tapered surface a formed on the front surface of the chuck body 12 is joined. When the joined state (chucked state, locked state) of the two chuck bodies 12 due to the tightness of the string 13 is released, the cover member 31 is lifted by the spring force F1 of the spring material 30 (at this time, the thin film 11 and the claw wheel 22). The convex tape 25 also rises integrally with the cover member 31), and the two chuck bodies 12 are laterally (on the upper end portion of the central shaft 21) by the lateral force F2 received by the tapered surface a from the tapered surface b. The direction in which the chuck (locked) state is released, that is, the direction in which the two chuck bodies 12 are separated from each other and in the direction indicated by the arrow L in FIG.

  As described above, FIG. 8A shows a state in which the two chuck bodies 12 are firmly attached by the string 13 and joined to each other (a state where the upper end portion of the central shaft 21 is locked). 8B shows a state where the string 13 is cut and the chuck body 12 is released from the chuck (locked) state of the upper end portion of the central shaft 21 and the cover member 31 is lifted by the spring force F1 of the spring material 30. FIG. Show. In FIG. 9A, the heating wire 15 is connected to the switch unit 38, the battery 39, and the control unit 40 provided in the satellite 2 through the switch unit 38.

  When a command to release the locked state, that is, a command to drop the satellite 2 to the earth, is transmitted from the command unit 3 of the space base on the earth, the switch unit 38 is turned on to the heating wire 15 that is a cutting means of the string 13 The electric current flows, and the string 13 is cut by the electric heat, and the state where the chuck body 12 is stuck by the string 13 (chuck state / lock state) is released. Then, the cover member 31 instantaneously rises in the direction of escaping from the case 20 (upward in FIGS. 6 and 7) by the spring force F <b> 1 that the spring material 30 extends from the pressing state shown in FIGS. 5 and 8A. Therefore, the heating wire 15 is operated by current flowing in response to a command from the command unit 3 (FIG. 1), thereby preventing the chucked state (the thin film 11, the claw wheel 22 and the convex tape 25 from escaping from the case 20). This is a releasing means for releasing the (prevented state).

  When the clamping state (chucked state / locked state) of the chuck body 12 by the string 13 is released, the cover member 31 instantaneously rises due to the spring force F1 that the spring material 30 extends, and FIG. 8 (b) and FIG. As shown in FIG. 7B, the tapered surfaces a of the front surfaces of the two chuck bodies 12 are moved away from each other by the force F2 in the expanding direction received from the tapered surface b of the neck detail 21a (FIG. 7, FIG. 8 (b), see arrow L in FIG. 9 (b)). As a result, the thin film 11, the ratchet wheel 22, the convex tape 25, and the cover member 31 are instantaneously raised integrally by the spring force F1 of the spring material 30, and jump out of the case 20 and out of the case 20 as shown in FIG. At the same time, the convex tape 25 released from the state confined in the case 20 is instantly extended into a straight straight line by its strong spring force.

  As a result, the thin film 11 in which the small holes 11a at the corners are coupled to the small holes 25a at the tip of the convex tape 25 by the thin strings 29 expands, and the space 11 expands greatly as shown in position B in FIG. Therefore, the lower convex tape 25 serves as a deployment means that escapes out of the case 20 and unfolds the thin film 11 immediately after the upper thin film 11 escapes from the case 20.

  If the thin film 11 is developed in this way, the earth orbit speed of the satellite 2 gradually decreases due to the gas resistance of a very thin gas existing in outer space, and finally falls gradually toward the ground due to gravity. As described with reference to FIG. 1, it is burned out and extinguished due to frictional heat with the atmosphere at the time of entry.

  As will be apparent from the above description, the lock means comprising the chuck body 12 and the string 13 to which the chuck body 12 is attached is such that the cover member 31 integrated with the thin film 11 and the convex tape 25 is moved upward by the spring force F1 of the spring material 30. It is a movement preventing means for preventing movement in the direction of escaping from the case 20. Further, the cover member 31 that presses the thin film 11 and the convex tape 25 from above and the above-mentioned movement preventing means are arranged so that the thin film 11 and the convex tape 25 escape from the inside of the case 20 to the outside of the case 20 against the spring force F1 of the spring material 30. It serves as an escape prevention means for preventing this. Further, the heating wire 15 serves as a release means for releasing the escape prevention state by a command transmitted from the command unit 3.

  The main point of the present invention is to spread a reduced thin film widely in space when the mission of a satellite orbiting the earth is completed and it is time to drop it onto the earth. And as this expansion | deployment means, it exists in using a convex tape desirably. Therefore, the present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the spirit of the invention. For example, the dimension in the developed state of the thin film, the planar shape, the number of convex tapes, the number of fixing points of the convex tapes, etc. can be arbitrarily determined. Further, as shown in FIG. 10, a plurality of convex tapes 25 (two in this example) may be stacked in accordance with a required deployment force per fixed portion, and the base end portion may be fixed to the mounting cylinder 26. A screw 37 can be applied as a fixing method. The convex tape 25 shown in FIG. 4 is also fixed to the mounting cylinder 26 with screws 37 in the same manner.

  Moreover, the string 13 can be cut | disconnected by the element etc. which heat | fever generate | occur | produces electrically like a resistance element and becomes high temperature, the cutter which protrudes and sunk with an electromagnet, etc. irrespective of the heating wire 15. Further, the small hole for coupling provided at the tip of the thin film or convex tape is not limited to the small hole, and any mechanism that can be coupled with a thin string or the like may be used.

  The chuck (locked) state release command may be transmitted from a timer as a command unit built in the satellite, or may be transmitted from another satellite as a command unit that flies relatively close. The rotating body is not limited to the ratchet wheel, but may be anything that can be locked to the stopper. However, if a claw wheel having a large number of claw portions on the outer peripheral edge is used, a desired tension is applied to the convex tape when the thin film is folded and wound into a tape shape as shown in FIG. 4 before launching the satellite. There is an advantage that it can be locked to the stopper 23 at a relatively arbitrary angle in the generated state. Further, if a large number of holes are formed within the range allowed for the mechanical strength of the case and the claw wheel, the weight can be further reduced.

  According to the present invention, it is possible to quickly drop and burn the space structure part where the mission is completed to the earth and eliminate the fact that it becomes garbage in outer space, so that it is particularly useful as a dropping device and dropping method for an artificial satellite.

1 Earth 2 Satellite (Space Structure)
3 Command section 10 Dropping device 11 Thin film 12 Chuck body 13 String 15 Heating wire (cutting means, releasing means)
20 Case (storage part)
21 Central axis 22 Claw wheel (rotating body)
22a Claw part 23 Stopper 25 Convex tape (deployment means)
29 Thin string (joint)
30 Spring material (biasing means)
31 Cover member

Claims (13)

  An earth of a space structure orbiting the earth, comprising a reduced thin film and a deploying means for deploying the thin film, and operating the deploying means in response to a command from the command section to expand the thin film into space. Fall device to the.   The apparatus according to claim 1, wherein the expansion means is a convex tape.   A method of dropping a space structure that orbits the earth according to claim 1 or 2 to the earth by a device for dropping the earth structure to the earth. The thin film is spread and expanded in outer space, the earth's orbital velocity of the space structure is gradually lowered by the gas resistance of the gas that is thinly received in the outer space, and the space structure is dropped toward the earth, A method of dropping a space structure to the earth that orbits the earth, characterized by burning and extinguishing the space structure by frictional heat.   The storage unit provided in the space structure, the central axis provided inside the storage unit, and the respective leading ends thereof are coupled to each other, wound around the central axis, and reduced and stored inside the storage unit. Thin film and convex tape, and an escape means for allowing the thin film and convex tape to escape from the storage portion. The storage portion also serves as an extension preventing means for preventing the convex tape from being stretched by its own spring force. The thin film and convex tape are escaped from the storage part by an escape means according to a command from the unit, and the convex tape is stretched by its own spring force, so that the thin film is expanded and expanded in outer space. A device for dropping space structures to the earth.   5. The space structure orbiting the earth according to claim 4, wherein the escape means is an urging means for urging the thin film and the convex tape so as to move in a direction of escaping from the storage portion. Fall device to the earth. The storage unit provided in the space structure, the central axis provided inside the storage unit, and the respective leading ends thereof are coupled to each other, wound around the central axis, and reduced and stored inside the storage unit. The thin film and the convex tape, and the thin film and the convex tape against the urging force of the urging means, the escaping means comprising the urging means for urging the thin film and the convex tape to move in the direction of escaping from the storage portion. An escape prevention means for preventing escape from the storage portion, and a release means for releasing the escape prevention state by the escape prevention means,
The storage part also serves as an extension preventing means for preventing the convex tape from extending due to its own spring force. By operating the release means in response to a command from the command part, the escape prevention state is released, so that the thin film and the convex The fall of the space structure that orbits the earth to the earth, which causes the tape to escape from the storage portion by the urging force of the urging means, and the thin film to be expanded into outer space by the spring force of the convex tape to extend. apparatus.   The escape prevention means comprises a cover member that presses the thin film and convex tape from above, and a movement prevention means that prevents the cover member from moving in the escape direction by the biasing force of the biasing means. The apparatus for dropping a space structure orbiting the earth according to claim 5 to the earth.   The movement preventing means is a plurality of chuck bodies and a plurality of chuck bodies provided on the cover member, and the upper end portion of the central shaft is chucked by the chuck body by clamping the chuck body with a string so that the central shaft is The space structure orbiting the earth according to claim 6 or 7, wherein the biasing means prevents movement in the direction of escape, and the release means is a string cutting means. A device for dropping objects to the earth.   A storage unit provided in the space structure, a central shaft provided inside the storage unit, a rotating body inside the storage unit that is rotatably mounted on the central axis, and a locking portion at the tip of the rotary body And a stopper that prevents the rotating body from rotating inside the storage portion by engaging with the rotator, and the respective tip portions are coupled to each other and wound around the central axis with the rotating body interposed therebetween, and reduced. An evacuation means comprising: a thin film and a convex tape; an urging means for urging the thin film and the rotating body in the storage portion, which are stacked in order from the top; The escape prevention means that prevents the thin film and the convex tape from escaping from the storage section due to the urging force, and the escape prevention means is operated by the command from the command section to release the escape prevention state, and the thin film is applied by the urging force of the urging means. And Convec Escape from the earth, characterized in that it has an escape prevention state release means that expands the thin film into outer space by its own spring force that causes the convex tape to straighten out by letting the tape escape from the storage section. A device that drops space structures onto the earth.   The earth of the space structure orbiting the earth according to claim 9, wherein the rotating body is a claw wheel, and the locking portion is a claw portion provided on an outer peripheral edge of the claw wheel. Fall device.   A cover member for pressing the thin film wound around the central axis and the convex tape; a plurality of chuck bodies provided on the cover member for chucking an upper end portion of the central axis; and the central axis by the chuck body The earth according to claim 9 or 10, comprising a string that clamps the chuck body so as to maintain the chucked state of the upper end of the earth, and the means for releasing the escape prevention state is a string cutting means. A device for dropping orbiting space structures onto the earth.   The apparatus according to any one of claims 4 to 11, wherein a plurality of the convex tapes are fixed by being overlapped at one fixed location. A method for dropping a space structure that orbits the earth by the apparatus for dropping the earth structure orbiting the earth according to any one of claims 4 to 12,
When it is time to drop the space structure, the thin film and the convex tape are escaped from the storage section by the command from the command section, and the convex tape is stretched by its own spring force so that the thin film is in space. The space structure is gradually lowered to the earth by the gas resistance of the gas that is thinly present in the outer space received by the thin film, and the space structure is dropped toward the earth. A method of dropping a space structure that orbits the Earth, characterized by burning and extinguishing the structure.

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