摘要:
Powder of a semiconductor material and solvent are packed into a rubber tube and both ends of the rubber tube are fixed by fixing rings in a condition with sealing in the vertical direction effected by an upper cover and a lower cover. After this, the rubber tube is immersed in an oil bath and pressure is applied uniformly from the side faces to the semiconductor material within the rubber tube, using hydraulic pressure. An extrusion molding of rectangular shape and of smaller cross sectional area than before molding is formed by extrusion from an extrusion port of rectangular solid shape of a die (extrusion mold) in which pressure is applied in an extrusion direction D by a punch to a rectangular solid sintered body of thermoelectric semiconductor material.
摘要:
A method of fabricating a thermoelectric element of enhanced thermoelectric performance is provided by improving the preparation of thermoelectric material and employing hot plastic working in combination. The method comprises the step (a) of mixing and heat-melting a raw material of a predetermined composition; the step (b) of turning the heat-melted material 106 into microglobules by either of scattering and spraying, and then quenching the microglobules, thereby providing a globular powdery thermoelectric material; and the step (c) of plastically deforming the thermoelectric material in a hot condition, thereby to bring crystal grains of the thermoelectric material into a crystal orientation affording an excellent figure of merit.
摘要:
The present invention provides a novel thermoelectric semiconductor material having excellent thermoelectric property which is not lowered like a conventional PbTe-based or PbSnTe-based semiconductor material even if a strength is improved by sintering. The thermoelectric semiconductor material of the invention is characterized by having chemical formula AB2X4 (where, A is a simple substance or mixture of Pb, Sn and Ge (IV family elements), B is a simple substance or mixture of Bi and Sb (V family elements), and X is a simple substance or mixture of Te and Se (VI family elements). In this case, a spark plasma sintering device is used to apply a pulsed current through the powder material to cause an electrical discharge among particles of the powder to synthesize the compound AB2X4 having a uniform structure. And, the invention synthesizes a compound, which is to be a thermoelectric semiconductor material, so to have a uniform structure. Using a spark plasma sintering device, a pulsed current is applied to the powder material to cause an electrical discharge among particles of the powder to synthesize compound PbBi2Te4 having a uniform structure.
摘要:
The present invention provides a novel thermoelectric semiconductor material having excellent thermoelectric property which is not lowered like a conventional PbTe-based or PbSnTe-based semiconductor material even if a strength is improved by sintering. The thermoelectric semiconductor material of the invention is characterized by having chemical formula AB2X4 (where, A is a simple substance or mixture of Pb, Sn and Ge (IV family elements), B is a simple substance or mixture of Bi and Sb (V family elements), and X is a simple substance or mixture of Te and Se (VI family elements). In this case, a spark plasma sintering device is used to apply a pulsed current through the powder material to cause an electrical discharge among particles of the powder to synthesize the compound AB2X4 having a uniform structure. And, the invention synthesizes a compound, which is to be a thermoelectric semiconductor material, so to have a uniform structure. Using a spark plasma sintering device, a pulsed current is applied to the powder material to cause an electrical discharge among particles of the powder to synthesize compound PbBi2Te4 having a uniform structure.
摘要:
A lens unit has a lens frame configured to be mounted to an imaging device having an imaging element, a first optical system having a first optical axis supported by the lens frame, a second optical system having a second optical axis supported by the lens frame; and an adjustment mechanism configured to adjust a position of the first optical system and/or the second optical system in an optical axis direction with respect to the lens frame.
摘要:
An image blur correction device 400 includes a pitching movement frame 405, a yawing movement frame 408, and a third group frame 462. The pitching movement frame 405 supports a third lens group G3 included in an optical system for performing image blur correction. The yawing movement frame 408 supports the pitching movement frame 405 to be movable in the pitching direction perpendicularly intersecting a second optical axis A2, within a plane perpendicularly intersecting the second optical axis A2. The third group frame 462 supports the yawing movement frame 408 to be movable in the yawing direction along an arc whose center is a rotational axis A3, within a plane perpendicularly intersecting the second optical axis A2.
摘要:
The present invention aims to provide an imaging device and a camera realizing simultaneously a high magnification zoom lens system and the miniaturization of the device. The imaging device (2) includes a first lens group (G1), a second group frame unit (42), a first group frame unit (41), a motor unit (32), a third lens group (G3), and a CCD unit (33). The first lens group (G1) takes in a light flux incident along a first optical axis (A1). The second group frame unit (42) bends the light flux incident along the first optical axis (A1) to a direction along a second optical axis (A2). The first group frame unit (41) retains the first lens group (G1), and moves the first lens group (G1) in the direction along the first optical axis (A1). The motor unit (32) drives the first group frame unit (41). The first group frame unit (41) includes a driving frame (51) movable in the direction along the first optical axis (A1), and a first group frame retaining the first lens group (G1) and able to move in the direction along the first optical axis (A1) with respect to the driving frame (51).
摘要:
A magnetic recording and reproduction apparatus includes a main chassis having a rotatable head cylinder provided thereon; and a sub chassis on which a tape cassette is mountable. The sub chassis is movable with respect to the main chassis between a tape cassette mountable position and a tape pull-out completion position, and the tape cassette mountable position is a position at which the tape cassette is mountable on the sub chassis and the tape pull-out completion position is a position at which information recording to and information reproduction from the tape, which has been pulled out from the tape cassette and has been wound around the rotatable head cylinder, can be performed. A portion of the main chassis along a forward end thereof is cut out toward the rotatable head cylinder.
摘要:
A tape tension controlling mechanism of a magnetic recording/reproducing apparatus for controlling a tension of a magnetic tape includes: a reel bed; a reel bed drum; a tension post; a tension arm rotatably supported by a tension arm shaft; an urging element; a tension band having an engagement portion; and a band fixing screw having a threaded portion at one end thereof and a head portion at the other end, the band fixing screw further having, between the threaded portion and the head portion, an intermediate shaft portion for engagement with the engagement portion of the tension band, wherein a longitudinal center line of the intermediate shaft portion is shifted from the longitudinal center line of the threaded portion, and a pitch P of a thread of the threaded portion and a longitudinal length L of the intermediate shaft portion have a relationship of L>P/2.
摘要:
A torque limiter of the present invention includes: a first rotor and a second rotor; a magnet which is provided so as to be in contact with the first rotor; and a hysteresis board provided so as to be opposed to the magnet with a space therebetween, wherein the hysteresis board is integrally formed with the second rotor, and first and second washers are provided between the first and second rotors so as to be in contact with one another.