Tdk Corporation

Tsutomu Kotani

Minoru Takahashi

Hideki Hirata

Shiro Nakagawa

Giichi Shibuya

Yasufumi Takasugi

Noboru Uemura

Kazuki Suzawa

Takashi Namioka

Kazuo Fukunaga

Toshikazu Hosobuchi

Shinichi Endo

Motoyoshi Fujita

Toshiharu Kawano

Shunpei Saeki

Kazunori Mishima

Akikazu Kunuki

Kazuo Saitoh

Kazumi Kobayashi

It is an object of the present invention to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is warped. The apparatus for discriminating an optical recording medium according to the present invention includes a first electrode, a second electrode, an alternating current signal generation circuitfor applying an alternating current signal A to the first electrode, a detection circuitfor detecting the level of an alternating current signal B appearing at the second electrode, a supporting mechanismfor supporting the first electrodeand the second electrode, a driving mechanismfor vertically moving the supporting mechanism, and a control circuitfor controlling the operations of the alternating current signal generation circuitand the detection circuitand the driving mechanism

Apparatus for discriminating optical recording medium and method for discriminating optical recording medium

A stepping motor including a rotor having a plurality of magnetic poles, one stator base arranged near the rotor, a pair of magnetic yokes fixed on the stator base and arranged to face the magnetic poles of the rotor, a pair of excitation coils for exciting the pair of magnetic yokes respectively in response to drive pulses which have phase difference, and a pair of stator magnetic polar portions integrally formed with the stator base. The stepping motor is constructed to form magnetic paths together with the number of magnetic turns of the excitation coils without increasing the size of the magnetic yokes, thereby enhancing operations and reliability.

Stepping motor

PTC thermistor device

A humidity meter has a housing (1) which has a separated sensor room (5) recessed in said housing (1) for securing a humidity sensor assembly (3). The humidity meter also has an electronic circuit (2) mounted on a printed circuit board (21) fixed in said housing (1), for processing humidity signal supplied by said humidity sensor assembly (3). Some examples of the process are analog-digital conversion of measured humidity signal, visible indication on a display screen, and/or interface with external circuit. Said humidity sensor assembly (3) is removably fixed on said printed circuit board (21) which doubles as a bottom wall (53) of said sensor room (5).

Humidity meter

System for mounting a piezoelectric vibrator comprises an annular projected vibrator support (27) integrally formed with an insulating support (21), a piezoelectric vibrator (1) located on the annular vibrator support (27) and an elastic annular holder (22) having an essentially L-shaped section for holding down the periphery of the piezoelectric vibrator (1) fitted to the insulating support (21), a plurality of connecting electrode members (23,24) being mounted on the vibrator support (27) and each of the connecting electrode members (23,24) being pressed against the corresponding electrodes (2B,2A') of the piezoelectric vibrator (1).

Piezoelectric vibrator mounting system for a nebulizer

A magnetic head of a cassette tape recorder set is demagnetized by a demagnetizer mounted in a tape cassette housing. The demagnetizer has an erase head which faces with the magnetic head which is subject to a demagnetizing action, a pair of rotatable rings which engage with spindles of the tape recorder set, energizing means for energizing said erase head with AC decreasing current, and coupling means for coupling said rings for simultaneous rotation of the rings.

Demagnetizer for a magnetic head of a cassette tape recorder

A displacement sensor for an electrocardiograph attaches a permanent magnet chip directly on a living body, and movement or vibration of the living body is sensed by measuring flux by said magnet. The electrocardiograph has a magnet assembly having an adhesive film mounting a permanent magnet at the center of the film supported on a bottom ring which has a plurality of upright walls with jaws, for detachably engaging the magnet assembly with a sensor body. The sensor body has saturable inductors which are placed in flux by said magnet and are coupled with a process circuit having an astable multivibrator with a collector load by said saturable inductors and a low-pass filter connected to the output of the multivibrator. The magnet assembly is first adhered on a living body, then, the sensor body is engaged with the same by engaging said jaws with a projection on the sensor body, then, the process circuit provides an output signal reflecting the movement of a living body. Said jaw on the sensor body and/or the magnet assembly has a slanted surface for easy coupling and/or detachment of the sensor body and the magnet assembly. Said adhesive film is covered with a removable paper, which is removed when the device is used. The length between said permanent magnet and said saturable inductors is set a little longer than the desired length for operation, taking into consideration the convexed profile of a human body.

Electrocardiograph

A displacement sensor or an electrocardiogram attaches a permanent magnet chip directly on a living body, and movement or vibration of the living body is sensed by measuring flux by said magnet. The displacement sensor has a magnet assembly having an adhesive film mounting a permanent magnet at the center of the film supported on a bottom ring which has a plurality of upright walls with jaws, for detachably engaging the magnet assembly with a sensor body. The sensor body has saturable inductors which are placed in flux by said magnet and are coupled with a process circuit having an astable multivibrator with a collector load by said saturable inductors and a low-pass filter connected to the output of the multivibrator. The magnet assembly is first adhered on a living body, then, the sensor body is engaged with the same by engaging said jaws with a ring on the sensor body, then, the process circuit provides an output signal reflecting the movement of a living body.

Displacement sensor

Growing community of inventors

Tokyo, Japan

Tsutomu Kotani