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:
Jul. 10, 2001
Filed:
May. 23, 2000
Hiroyasu Torazawa, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An optical coupling semiconductor switching circuit to be coupled to a light emitting device for controlling electric circuits. The switching circuit includes a light detector generating voltage in response to light from the light emitting device and an impedance circuit having a first and a second output terminal. The impedance circuit is connected to the light detector and passes through a voltage input from the light detector to the output terminals with little loss. A plurality of switching devices are connected in parallel between the output. Each switching device includes at least a pair of transistors each having a gate connected to the first output terminal, and an optical rectifier that is activated by light from the light emitting device. The rectifier has a cathode connected to a source of each transistor and a anode connected to the second input terminal.