Hitachi Construction Machinery Co., Ltd.

Toshihiro Kimura

Yuichi Kunitomo

Yukio Arima

Ken Takeuchi

Tadatoshi Shimamura

Toshihiko Ishida

Tohru Miyata

Tetsuhiro Doi

Takeshi Nishiduka

A power supply device comprises a bidirectional voltage converter unit that performs voltage stepping up or voltage stepping down between a first terminal and a second terminal; a first switching unit that applies a DC voltage obtained from the first electric power supply source to the first terminal; a second switching unit that applies a DC voltage obtained from the second electric power supply source to the first terminal; a third switching unit that applies a DC voltage obtained from the first electric power supply source to the second terminal; an output unit that outputs a predetermined DC voltage from the second terminal; and a switching control unit that controls switching of the first switching unit, the second switching unit and the third switching unit.

Power supply device and construction machine

In an ultrasonic inspection and imaging instrument, a pulse generator and a burst wave generator are provided in association with the activation of an ultrasonic probe by the pulse generator and in response to a measurement value obtained from a signal reception circuit portion. A first gate position is obtained with regard to an inspection portion in a sample, and then a second gate position for a burst wave measurement is set by correcting the first gate position. The burst wave measurement is performed by activating the burst wave generator.

Ultrasonic inspection and imaging intstrument

Ultrasonic inspection and imaging instrument

Growing community of inventors

Ibaraki, Japan

Toshihiro Kimura