公开(公告)号：US4184086A

公开(公告)日：1980-01-15

申请号：US921951

申请日：1978-07-05

Applicant: Akio Sagawa ,  Masayoshi Suzuki ,  Tetsuo Ito

Inventor： Akio Sagawa ,  Masayoshi Suzuki ,  Tetsuo Ito

IPC: H02M1/06 ,  H01L29/74 ,  H03K5/04 ,  H03K17/0812 ,  H03K17/16 ,  H03K17/73 ,  H03K17/72

CPC classification number: H03K17/16 ,  H03K17/08124 ,  H03K5/04

Abstract: A semiconductor switch comprising a PNPN switch which has a four-layered PNPN structure with at least three PN-junctions, switching means for electrically short-circuiting a path between a P-type base and an N-type emitter of the PNPN switch when a transient voltage is applied between a P-type emitter and the N-type emitter of the PNPN switch, and drive means for driving the switching means, the drive means driving the switching means so that the path between the P-type base and the N-type emitter may be electrically short-circuited for a fixed time even after termination of the transient state, whereby any improper ignition of the PNPN switch is prevented even after the termination of the transient state.

Abstract translation: 一种半导体开关，包括具有至少三个PN结的四层PNPN结构的PNPN开关，当PNPN开关的P型基极和N型发射极之间的路径电气短路时， 在P型发射极和PNPN开关的N型发射极之间施加瞬时电压，以及用于驱动开关装置的驱动装置，驱动装置驱动开关装置，使得P型基极和N 即使在暂态状态结束之后，也可能固定时间内电气短路，从而即使在暂态状态结束后也防止了PNPN开关的任何不正确点火。

公开(公告)号：US4045767A

公开(公告)日：1977-08-30

申请号：US398474

申请日：1973-09-18

Applicant: Motohisa Nishihara ,  Tetsuo Ito

Inventor： Motohisa Nishihara ,  Tetsuo Ito

IPC: H04L27/26 ,  H04B11/00 ,  H04L27/30 ,  G01V1/00 ,  H04B13/00 ,  H04B15/00

CPC classification number: H04B11/00 ,  H04L27/30

Abstract: In an ultrasonic data communication system, each datum is represented by a specific ultrasonic wave signal composed of plural frequency components arranged according to a specific one of predetermined frequency permutations so that the data transmission time can be considerably reduced without the influence of reverberation.