Nec Corporation

Hitachi-High-Technologies Corporation

Takaaki Hara

Yoshihiro Nagaoka

Hiroshi Moriya

Kiyotoshi Mori

Ayano Otsubo

Kiyoshi Satou

Shoji Tomita

Provided are: a flow path switching valve that reduces the pressure load in a contact surface outer peripheral section of the flow path switching valve and inhibits friction between constituent components; and a liquid chromatographic device using the flow path switching valve. The flow path switching valve is provided with a stator having a plurality of through holes and a seal having conduction grooves for causing the through holes to conduct. The seal has a first portion present vertically beneath a region comprising at least a surface of contact with the stator, and a second portion having lower rigidity than the first portion, on the outside of the first portion. Due to this configuration, it is possible to reduce the pressure load when a flow path of a liquid is switched under high-pressure conditions, and inhibit the phenomenon of friction itself.

Fluid switching valve and liquid chromatograph apparatus using the same

The CMOS integrated circuit includes an oscillator including a capacitor having a polysilicon gate of one of several transistors as an electrode thereof and a diffused resistor located adjacent to the polysilicon gate, a counter circuit for calculating a frequency of the oscillator, a power-supply voltage control circuit for selecting an optimal power-supply voltage for transistors in accordance with the frequency, and a power-supply circuit for generating the optimal power-supply voltage.

CMOS circuit for generating voltage related to transistor gate length

A temperature compensated oscillator and a temperature detector have a temperature sensor having a single case in which a pair of AT cut crystal resonator having substantially the same natural oscillation frequency and different cut angles from each other are accommodated. The crystal resonators each constitutes the resonance circuit of respective one of two oscillation circuits. A difference in frequency between the output frequencies of the oscillation circuits is representative of a detected temperature.

Temperature detector and a temperature compensated oscillator using the

A piezo-electric oscillator includes an oscillatory circuit including a piezo-electric resonator for generating an oscillatory signal, a buffer amplifying circuit for buffering and amplifying the oscillatory signal, the buffer amplifying circuit being connected serially with the oscillatory circuit, and a switching circuit for switching a power supply line. The switching circuit is connected in parallel with the buffer amplifying circuit and selectively short-circuits the buffer amplifying circuit in accordance with an output signal of the oscillatory circuit.

Growing community of inventors

Tokyo, Japan

Takaaki Hara