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:
Feb. 15, 1994
Filed:
Apr. 23, 1992
Shigemasa Kamimura, Chiba, JP;
Sony Corporation, Tokyo, JP;
Abstract
A predetermined rush current is set by a current setting switch (25). A digital-to-analog (D/A) converter (27) multiplies an attenuation curve signal input thereto from a read-only memory (ROM) (28) and the rush current thus set by the current setting switch (25) with each other and outputs a multiplied output to a D/A converter (29). The D/A converter (29) multiplies a signal input thereto from the D/A converter (27) and a sine wave signal read out from a ROM (30) and output a multiplied output to a field effect transistor (FET) (22) through an operational amplifier (24) to thereby control a degaussing current flowing through a degaussing coil (5). Therefore, a stable degaussing effect can be reproduced.