Abstract: A variable displacement type compressor has a supply passage for supplying refrigerant gas to a pressure control chamber, a release passage for releasing the refrigerant gas from the pressure control chamber, a first control valve for controlling the amount of the refrigerant gas flowing through the supply passage, a check valve provided between the first control valve and the pressure control chamber and preventing the refrigerant gas from flowing from the pressure control chamber to the first control valve by closing the supply passage and a second control valve for adjusting a cross-sectional area of the release passage from minimum to maximum. The second control valve has a back pressure chamber communicating with the supply passage, a valve chamber forming a part of the release passage and communicating with a suction-pressure region, a valve hole forming a part of the release passage and communicating with the valve chamber and a spool having a valve portion located in the valve chamber.

Abstract: An optical disc drive device has a metallic exterior casing and an internal unit to be housed in the exterior casing. The internal unit further includes an optical pickup unit for performing recording or reproduction of information signals on an optical disc, and a printed wiring substrate on which a connector electrically connected to the optical pickup unit and serving for transmission and reception of electrical signals from and to external electronic equipment is mounted. The exterior casing has an opening for allowing the connector to be exposed outside, the printed wiring substrate has a ground pattern formed to surround the connector, and a fringe portion of the opening of the exterior casing and the ground pattern are in electrical contact with each other. Thus, radiation noise from around wiring lines contained in the optical disc drive device or the like is reduced.

Abstract: An electronic device includes a metallic body, a circuit substrate having electronic components and wiring conductors, a heat conduction member that absorbs a heat generated by the electronic components, and a heat radiation member provided between the metallic body and the heat conduction member. The heat radiation member includes a heat introduction portion surface-contacted with the heat conduction member, a heat discharge portion surface-contacted with the metallic body, and a heat conduction portion that conducts the heat from the heat introduction portion to the heat discharge portion. The heat conduction portion is provided to be separated from the wiring conductors so as not to electromagnetically couple to the wiring conductors.

Abstract: An optical disc driving device has a metallic exterior casing and an internal unit to be housed in the exterior casing. The internal unit further includes an optical pickup unit for performing recording or reproduction of information signals on an optical disc, and a printed wiring substrate on which a connector electrically connected to the optical pickup unit and serving for transmission and reception of electrical signals from and to external electronic equipment via an external-connection cable is mounted. The exterior casing has an opening for allowing the connector project outside, and the connector is connected to the external-connection cable in a direction that orthogonally crosses with a projecting direction of the connector from the opening, and the external-connection cable extends from the connector along a surface of the exterior casing.

Abstract: An optical disc driving device has a metallic exterior casing composed of a first casing and a second casing and an internal unit to be housed in the exterior casing. The internal unit includes an optical pickup unit having an optical pickup part that moves in radial directions of an optical disc to perform recording or reproduction of information signals on the optical disc. At a portion where the optical pickup part moved radially outward of the optical disc makes a closest approach to, in either one of the first casing or the second casing opposed to the first casting, a protrusion for electrically connecting the first casing and the second casing to each other is provided.

Abstract: An optical disc driving device having a metallic exterior casing and an internal unit to be housed in the exterior casing, the internal unit further including an optical pickup unit for performing recording or reproduction of information signals on an optical disc, and a printed wiring substrate on which a connector electrically connected to the optical pickup unit and serving for transmission and reception of electrical signals from and to external electronic equipment via an external-connection cable is mounted, wherein the exterior casing has an opening for allowing the connector to be projected outside, the connector is so provided as to be connected to the external-connection cable in a direction that orthogonally crosses with a projecting direction of the connector from the opening, and the external-connection cable is so provided as to extend from the connector along a surface of the exterior casing.

Abstract: An optical disc driving device having a metallic exterior casing composed of a first casing and a second casing and an internal unit to be housed in the exterior casing, the internal unit including an optical pickup unit having an optical pickup part that moves in radial directions of an optical disc to perform recording or reproduction of information signals on the optical disc, wherein at a portion, which the optical pickup part moved radially outward of the optical disc makes a closest approach to, in either one of the first casing or the second casing opposed to the first casting, a protrusion for electrically connecting the first casing and the second casing to each other is provided.

Abstract: A variable displacement type compressor in which a discharge-pressure region, a suction-pressure region and a pressure control chamber are defined, has a tiltable swash plate and a piston reciprocated by the swash plate in the pressure control chamber. The inclination angle of the swash plate and the piston stroke are changed by adjustment of pressure in the pressure control chamber thereby to control the displacement of the compressor. The compressor further comprises a supply passage for supplying refrigerant gas from the discharge-pressure region to the pressure control chamber, a release passage for releasing the refrigerant gas from the pressure control chamber to the suction-pressure region, a first control valve for adjusting a cross-sectional area of the supply passage from the discharge-pressure region to the pressure control chamber and a second control valve for adjusting cross-sectional area of the release passage.

Abstract: A receptacle includes a signal terminal, a ground terminal, and a signal terminal. A second portion of the ground terminal is distanced from a first portion of the signal terminal in an extension direction. A third portion of the signal terminal is distanced from the first portion of the signal terminal in the extension direction.

Abstract: A signal transmitter apparatus generates three phase-shifted signals by shifting three transmission signals by predetermined phase shift amounts so that the phase shift amounts of the transmission signals are different from each other by 120 degrees. The signal transmitter apparatus generates three combined transmission signals and outputs the three combined transmission signals to the three transmission conductors, respectively, by combining each of pairs of the phase-shifted signals such that an inverted signal of a first phase-shifted signal is combined with a second phase-shifted signal, when each of the pairs of the phase-shifted signals includes the first and second phase-shifted signals among the three phase-shifted signals and phase shift amounts of the first and second phase-shifted signals are different from each other by 120 degrees.

Abstract: Disclosed is an optical disc drive device having a metallic exterior casing and an internal unit to be housed in the exterior casing, the internal unit further including an optical pickup unit for performing recording or reproduction of information signals on an optical disc, and a printed wiring substrate on which a connector electrically connected to the optical pickup unit and serving for transmission and reception of electrical signals from and to external electronic equipment is mounted, wherein the exterior casing has an opening for allowing the connector to be exposed outside, the printed wiring substrate has a ground pattern formed to surround the connector, and a fringe portion of the opening of the exterior casing and the ground pattern are in electrical contact with each other. Thus, radiation noise from around wiring lines contained in the optical disc drive device or the like is reduced.

Abstract: A voltage memory stores a signal level of a transmission signal from a signal generator at a timing of a clock signal, and outputs the transmission signal. A voltage difference detector detects a signal level of a transmission signal at a timing subsequent to the timing and detects a first signal level difference between the signal level and the signal level from the voltage memory. A maximum value detector, a voltage difference detector and bias voltage sources delay the transmission signal so as to keep a rise time of the transmission signal substantially within a predetermined value range by adding capacitances corresponding to the first signal level differences from the voltage difference detectors to transmission lines.

Abstract: The present invention sufficiently reduces unwanted radiation in a plasma display panel (PDP) display device. The display device includes a PDP having a pair of electrodes, a first, a second, and a third conductive member, and a pair of driving circuits used to apply a voltage to their respective electrodes. Each conductive member has substantially the same width and height as the PDP, and the first, second, third conductive members are disposed on the rear surface of the PDP, in this order on the rear side of the PDP. The PDP and the conductive members are connected electrically to one another in the end portions of these elements, either directly or via the driving circuits, so that the direction of the current flowing in the PDP during driving and discharge coincides with the direction of the current flowing in the third conductive member, and is opposite from the direction of the current flowing in the first conductive member and the second conductive member.

Abstract: A plasma display device capable of reducing an electromagnetic interference wave due to a driving current flowing in a plasma display panel is provided. The plasma display device includes a plasma display panel having electrodes that are parallel to each other, a driver circuit board for applying a voltage to the electrodes, a chassis conductor holding the plasma display panel and to which a ground of the driver circuit board is connected, and a first additional conductor plate provided to the chassis conductor via an insulating layer and to which grounds of at least one circuit board in circuit boards other than the driver circuit board are attached.

Abstract: A receptacle includes a signal terminal, a ground terminal, and a signal terminal. A second portion of the ground terminal is distanced from a first portion of the signal terminal in an extension direction. A third portion of the signal terminal is distanced from the first portion of the signal terminal in the extension direction.

Abstract: A differential transmission line connector with little unwanted radiation noise is provided. A connector connects a differential transmission pattern for multiple transmission of a group of three differential signals and a differential transmission cable. The differential transmission pattern is provided with three signal lines, and the differential transmission cable also is provided with three signal lines. In a plane that is perpendicular to the longitudinal direction of the differential transmission pattern and the differential transmission cable, the signal lines are positioned at the apexes of an equilateral triangle.

Abstract: The present invention provides a shield structure for an electronic device allowing conductive members to be connected electrically to each other at low impedance while preventing the leakage of electromagnetic waves effectively. The first conductive member and the second conductive member for enclosing the electronic device respectively have laid portions that are laid one on the other and fastened to each other at plural positions by means of screw members. Through-holes into which the screw members are to be inserted are formed on both of the laid portions. Protruding portions, which protrude toward the laid portion of the second conductive member, each are formed between the adjacent through-holes on the laid portion of the first conductive member. The protruding portions each have a shape extending in the direction connecting the adjacent through-holes and bulging from both ends toward the center thereof in a smooth curve.

Abstract: In a receptacle, a ground terminal includes a bottom face connection portion connected to a bottom face of a terminal insulating board and a forward connection portion that is distanced from an opening. A signal terminal includes a top face connection portion connected to a top face on the opposite side of the bottom face connection portion and a rearward connection portion that is provided closer to the opening than the forward connection portion.

Abstract: A transmission cable that has three signal lines, and in which there is little unwanted radiation noise, is provided. In a section that is perpendicular to the longitudinal direction of the differential transmission cable, the distance between any two signal lines of the three signal lines is equal to a predetermined value. The differential transmission cable is twisted in its longitudinal direction. The differential transmission cable further includes a dielectric core line, and the signal lines are formed on the surface of the dielectric core line. In the differential transmission cable, the signal lines are formed in a helix in the longitudinal direction of the dielectric core line.

Abstract: A differential transmission line that has three or more signal lines and with which there is little unwanted radiation noise is provided. The differential transmission line 2 is provided with three signal lines 2a, 2b, and 2c that transmit differential signals from a differential driver IC1 to a differential receiver IC3, and the majority of the signal lines 2a, 2b, and 2c is provided in conductor layers T2 and T3 of a printed circuit board 4.