Abstract: A spacecraft includes: a main-reflection unit configured to reflect and emit a radio wave outside, a sub-reflection unit configured to face the main-reflection unit, a radiator arranged to face the sub-reflection unit and configured to radiate the radio wave in a direction of the sub-reflection unit, a main body configured to be able to accommodate at least one part of the sub-reflection unit therein, and a delivery device connected to the sub-reflection unit and configured to deliver the sub-reflection unit, at least one part of which is accommodated in the main body, to a position where the sub-reflection unit is able to reflect the radio wave radiated from the radiator to the main-reflection unit and cause the main-reflection unit to radiate the radio wave outside.

Abstract: Spacecraft and antenna apparatus that can be more easily deployed from a stored state can include: a main-reflection unit including a plurality of ribs formed to be deployable in a stored state in which the ribs are folded and a sheet body provided between a plurality of the ribs and configured to be capable of reflecting a radio wave radiated from a radiator and emitting the radio wave outside, and a restriction member configured to restrict deployment of the plurality of ribs in the stored state, and release the restriction by operation of a restriction release member different from the main-reflection unit.

Abstract: [Problem] To provide a spacecraft having a more effective arrangement of amplifiers. [Solution] Provided is a spacecraft comprising: a main body having a housing space for housing an electronic device within; an oscillator configured to output a radio wave including a frequency in a predetermined frequency band; an amplifier disposed on an exterior of the main body so as to be exposed to space and configured to amplify the power of the radio wave output by the oscillator; and an antenna, disposed on the exterior of the main body, for emitting the radio wave to the outside at the power amplified by the amplifier.

Abstract: Deployable reflectors and antennas and spacecraft using such reflectors are disclosed. An example disclosed reflector includes: a hub having a cross-section formed in a circular, elliptical or polygonal shape; a plurality of ribs, each rib having an inner side surface facing an outer peripheral side of the hub when folded, and an outer side surface that is a surface opposite to the inner side surface, the plurality of ribs being folded to be wound around an outer periphery of the hub such that the inner side surface of each rib and the outer side surface of its adjacent rib partially face each other or the outer side surface of each rib and the inner side surface of its adjacent rib partially face each other, each rib being deployed in a parabolic shape; and a sheet installed across each of the plurality of ribs and capable of reflecting radio waves.

Abstract: Antenna apparatus and spacecraft to be deployed in a more easily stored state are disclosed. In an example of the disclosed technology, and antenna apparatus includes: a main-reflection unit including a plurality of ribs formed to be deployable in a stored state in which the ribs are folded and a sheet body provided between a plurality of the ribs and configured to be capable of reflecting a radio wave radiated from a radiator and emitting the radio wave outside, and a restriction member configured to restrict deployment of the plurality of ribs in the stored state, and release the restriction by operation of a restriction release member different from the main-reflection unit.

Abstract: Antenna apparatus and spacecraft to be deployed in a more compactly stored state are disclosed. In an example of the disclosed technology, a spacecraft includes: a main-reflection unit configured to reflect and emit a radio wave outside, a sub-reflection unit configured to face the main-reflection unit, a radiator arranged to face the sub-reflection unit and configured to radiate the radio wave in a direction of the sub-reflection unit, a main body configured to be able to accommodate at least one part of the sub-reflection unit therein, and a delivery device connected to the sub-reflection unit and configured to deliver the sub-reflection unit, at least one part of which is accommodated in the main body, to a position where the sub-reflection unit is able to reflect the radio wave radiated from the radiator to the main-reflection unit and cause the main-reflection unit to radiate the radio wave outside.

Abstract: An expandable antenna includes: a plurality of ribs arranged with a regulated angular pitch at an outer circumferential portion of a hub; and a metal mesh installed between the plurality of adjacent ribs, wherein each of the plurality of ribs is formed in a horizontally elongated thin flat plate shape with elasticity, and a segment to which the metal mesh is attached is formed in a parabolic shape. A flat plane of each of the plurality of ribs is arranged so as to be substantially parallel to a central axis of the hub. The object of the present invention is to provide the expandable antenna which can be easily expanded in outer space with a simple structure and can realize a desired shape after expansion.

Abstract: Deployable reflectors and antennas and spacecraft using such reflectors are disclosed. An example disclosed reflector includes: a hub having a cross-section formed in a circular, elliptical or polygonal shape; a plurality of ribs, each rib having an inner side surface facing an outer peripheral side of the hub when folded, and an outer side surface that is a surface opposite to the inner side surface, the plurality of ribs being folded to be wound around an outer periphery of the hub such that the inner side surface of each rib and the outer side surface of its adjacent rib partially face each other or the outer side surface of each rib and the inner side surface of its adjacent rib partially face each other, each rib being deployed in a parabolic shape; and a sheet installed across each of the plurality of ribs and capable of reflecting radio waves.

Abstract: An expandable antenna includes: a plurality of ribs arranged with a regulated angular pitch at an outer circumferential portion of a hub; and a metal mesh installed between the plurality of adjacent ribs, wherein each of the plurality of ribs is formed in a horizontally elongated thin flat plate shape with elasticity, and a segment to which the metal mesh is attached is formed in a parabolic shape. A flat plane of each of the plurality of ribs is arranged so as to be substantially parallel to a central axis of the hub. The object of the present invention is to provide the expandable antenna which can be easily expanded in outer space with a simple structure and can realize a desired shape after expansion.

Abstract: A process for making a coil having no bobbin comprises the steps of connecting one end of an electrical conductor to a coil making jig, rotating the jig to wind the electrical conductor thereon while applying a tension to the conductor as the coil is being formed, and removing the coil from the jig, the tension on outer windings of the coil being greater than that on inner windings thereof. Accordingly, the outer winding provides a high pressure against the inner winding such that a high friction is produced between the adjacent windings, whereby the windings of the coil do not subsequently separate from each other.

Abstract: Disclosed is a coil device having feeders which are connected to a power source and which are adapted to supply electric current, a coil conductor section which is connected at both ends to these feeders and wound into a coil in a position adjacent to the feeders, and dents formed in at least one of the coil conductors of the coil conductor section at positions in the vicinity of the feeders in such a manner as to generate current loops which cancel the error magnetic field generated by the error magnetic field current loop of the feeders.

Abstract: The coil arrangement of a nuclear fusion apparatus according to the present invention comprises a return conductor divided into two lines, one of which is connected to resistance-inductance adjuster. The resistance-inductance adjuster is adapted to adjust the current distribution, thereby considerably reducing the error magnetic field generated to improve the characteristic of plasma confinement.

Abstract: A coil arrangement for a nuclear fusion apparatus comprises a return conductor radially penetrating through a coil at a portion having a transition between turns and a feed conductor symmetrically arranged with regard to the axis of the return conductor. The coil arrangement practically reduces current loops generated by the transition current, thereby practically reducing the generation of the error magnetic fields and, therefore, better confining the plasma.

Abstract: A poloidal coil arrangement for a nuclear fushion apparatus comprises at least two poloidal coil sections each including a plurality of conductor turns, and a plurality of bridging joining members for electrically and metallurgically joining the turn ends of the conductor turns to form a plurality of complete turns. The joining members have end surfaces shaped such that the joining members can be supported by the end surfaces of the conductor turns. The length in the circumferential direction of the top side of each joining member is nearly equal to or shorter than the length in the circumferential direction of the opposing lower side of the upper joining member located above that joining member.

Abstract: The present invention relates to a toroidal coil apparatus including a plurality of coil support frames which contain coils having wedge-like coupling portions at the inner end portions thereof, reinforcing members which are provided at portions off the straight portions of the coil support frames and in the vicinity thereof, the reinforcing members having keyways and spaces to couple and fasten said coil support frames together, keys that are inserted in the keyways of the reinforcing members to couple the coil support frames together, and bolts that are screwed into the reinforcing members at the portions thereof backed by spaces to rigidly secure the coil support frames.

Abstract: A toroidal coil apparatus which includes a plurality of coil support frames which contain coils and which are radially arranged with wedge surfaces of wedge-like coupling portions juxtaposed to each other at the inner end portions thereof, flanges formed along straight portions of said support frames inside the torus, bands that engage across a predetermined number of said flanges to fasten said support frames which are neighboring to one another, thereby to constitute blocks; and coupling members which are arranged inside the torus and which firmly couple the blocks together.

Abstract: A large diameter, high current capacity, superconductive solenoid coil is formed by winding a conductor around a cylindrical mandrel 2, and then encasing the outer surface of the coil 1 with a support cylinder comprising an assembly of cylinder sectors 11 rigidly joined together along axial seam lines. The joining of the sectors may be implemented by welding, and heat shielding strips 13 may be disposed in recesses 15 in the sectors to prevent thermal damage to the coil insulation 14 during the welding. The support cylinder serves to absorb heat generated during the operation of the coil, and to withstand the outwardly directed electromagnetic forces developed. The mandrel is removed after the cylinder sectors are joined.

Abstract: A semiconductor memory device composed of bipolar transistors is disclosed. A read/write control circuit includes a voltage producing section which produces a reading-out voltage used for reading out the data stored in the selected memory cell. The voltage producing section includes a first transistor of an emitter follower type as its output stage, and the data-read operation is thus attained in a high speed. The voltage producing section further includes a diode whose ON voltage is substantially equal to that of a clamping diode provided in a memory cell and a second transistor having an emitter resistor and a collector resistor and supplying the collector resistor with a current determined by the ON voltage of the diode and the emitter resistor. The potential at the collector of the second transistor is applied to the first transistor.