Hitachi, Ltd.

Other

Renesas Technology Corp.

Hitachi Chemical Company, Ltd.

Hitachi Maxell, Limited

Takehiro Ohkawa

Kazuo Kaneko

Kimiaki Ando

Hiroshi Yoshigi

Kazuki Watanabe

Masatoshi Ohtake

Kazunari Nakagawa

Takeshi Tottori

Kimio Kanda

Nobuo Hamamoto

Isao Ochiai

Tadashi Oonishi

Miki Yuyama

Yutaka Kinebuti

Provided is a portable information device having an RFID, the device being a device in which no effect is produced on original communication of the portable information device for which an EMC measure is taken, the device having good productivity, and the device keeping communication distance without damaging portability. A place where an antenna is set is located on the side of a battery cover of a battery receiving section to make the communication distance of an incorporated RFID long. A circuit configuration wherein a condenser for resonance is connected to both ends of the antenna coil and an IC is connected to an intermediate tap of the antenna coil is made so as to make it unnecessary that the resonance frequency of the RFID is individually adjusted and make the production of the RFID easy. A magnetic material sheet is arranged between the antenna coil and a battery to ensure a magnetic circuit for causing a magnetic flux from an external apparatus to pass through the antenna coil of the RFID and make the Q of the resonance circuit high.

Portable information device

An RFID which provides a wide working voltage range and general versatility at low cost, without the need for changing its internal circuit design due to external factors. In the RFID, there is provided an arrangement that a low impedance state is given when its internal data communication circuit is in a reset state.

RFID (radio frequency identification) and IC card

The pattern line width of a coil is partially widened in a predetermined dimension and wiring patterns of a coil on the surface side and a coil on the rear side are arranged so as not to be in overlapped positions. Consequently, a direct current resistance of the coil can be reduced and an adverse influence by a self resonance of the coil on a communication can be reduced.

Contactless IC card

A parallel radiation detector includes a plurality of radiation detecting elements, a plurality of preamplifiers for converting signals from the radiation detecting elements into voltage signals, a signal processing device for processing the voltage signals, a main control device for controlling the signal processing device to analyze the voltage signals, a display device for displaying analyzed results from the signal processing device, a storage device for storing signals, a plurality of a reset circuits corresponding to the plurality of preamplifiers, each reset circuit for generating a reset signal for returning the corresponding one of the preamplifiers to an initial state thereof when the voltage signal from the corresponding one of the preamplifiers reaches a predetermined voltage, and an inhibitor circuit for generating an inhibit signal for inhibiting the signal processing device from receiving and processing the voltage signals from the preamplifiers temporarily, based on the reset signal.

Parallel radiation detector

A contactless parallel data transfer device which is miniature, highly densed, and highly reliable having a coil block consisting of a first coil group installed in a portable memory and a coil block consisting of a second coil group installed in a data server for transferring access data in parallel between the portable memory (memory card, etc.) and the data server by contactless coupling, wherein the opposite coils of the first and second coil blocks are held close and opposite to each other on a contactless basis, and a parallel pulse group which is transferred in parallel between the both coil blocks is divided at least into a first parallel pulse group consisting of the first number of bits and a second parallel pulse group consisting of the second number of bits, and the parallel transfer timings of the both parallel pulse groups are different from each other, and an induced signal to the neighboring coils of each opposite coil pair of the first and second coil blocks is negated in the opposite phase.

Noise reduced contactless parallel data transfer device and method

Growing community of inventors

Kunitachi, Japan

Takehiro Ohkawa