The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 1992
Filed:
Jan. 31, 1991
Yukio Idaka, Kadoma, JP;
Shuichiroh Yamaguchi, Kadoma, JP;
Hisakazu Miyajima, Kadoma, JP;
Takeshi Matsumoto, Kadoma, JP;
Yasunori Miyamoto, Kadoma, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
A semiconductor relay circuit includes a MOS FET receiving a photovoltaic output generated across a photovoltaic diode array. The photovoltaic diode array is responsive to a light signal from a light-emitting element. A cross gate and source electrodes of a MOS FET is connected a control circuit which is at a high impedance state during the generation of the photovoltaic output but to be at a low impedance state upon disappearance of the output. Additionally, resistors are inserted in series respectively in each of current, one path flowing from the photovoltaic diode array across the gate and source electrodes of the MOS FET and the other path flowing a discharge current from a capacity across the gate and source electrodes of the MOS FET to the control circuit, whereby the setting of rise and fall of circuit output signals can be made easier.