Abstract: An apparatus for generating SH waves comprises a casing, a rotor, stator, a flywheel connected to the rotor and a controller for controlling the rotation of the flywheel. The flywheel is first rotated at a predetermined speed, and then its rotation speed is decreased or increased continuously or intermittently, thereby to generate the SH wave onto an objective solid body.

Abstract: A semiconductor integrated circuit with a short turn-off time in which a high breakdown voltage semiconductor element and a Schottky barrier diode are fabricated into a semiconductor substrate, is disclosed. In the integrated circuit, within a semiconductor substrate of a first conductivity type, a diffusion layer with a low impurity concentration disposed deeply which is used as one layer of a high breakdown voltage semiconductor element formed by a high breakdown voltage process and a diffusion layer with a high impurity concentration disposed more shallowly than the diffusion layer with a low impurity concentration, are formed so as to partially couple with each other. The diffusion layer with the high impurity concentration is used for both the ohmic contact for the electrode of the diffusion layer with the low impurity concentration and for a guard ring for a Schottky barrier diode.

Abstract: A semiconductor speech path switch selectively connects a transmitting circuit which is connected with a row line to one of a plurality of receiving circuits which are respectively connected with associated column lines, the row lines and column lines forming a matrix of signal transmission lines. The switch includes a plurality of PNPN switching elements respectively connected across row and column lines of the matrix, a plurality of diodes for triggering the respective switching elements and a plurality of control gate lines connected with the diodes for triggering each switching element. Control signals are applied to input terminals of respective switching circuits to selectively energize the individual PNPN switching elements during the presence of a control signal supplied thereto. In the absence of the control signal, the control gate lines are shunted to ground to prevent cross-talk interference and erroneous triggering of non-selected PNPN switching elements.

Abstract: A cathode gate triggering method and system for speech path channel switches using m .times. n PNPN switches as switching elements, in which l .times. n PNPN switches in each switch array connected in common at the anode thereof are connected in multiple at the control gate thereof to substantially a single control gate common line through respective diodes, and a single constant-current regulated power supply capable of switching the output current thereof by being controlled by an external control source is connected to this control gate common line for supplying constant current to the control gate of each of the PNPN switches, so that uniform gate current can be supplied to each of the multiple connection stages, and each of the PNPN switches can be triggered in a stable and reliable manner.