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. 31, 1990
Filed:
Jun. 10, 1988
Applicant:
Inventors:
Assignee:
Onkyo Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323902 ; 323282 ; 323284 ; 341144 ; 363 21 ;
Abstract
A constant-voltage power supply circuit having a light-emitting element and a photosensitive element optically coupled with each other and a driving power source for driving the light emitting element, the circuit using an output voltage of the photosensitive element as a reference voltage; and an amplifier circuit using a constant current converted from the reference voltage of the constant-voltage power supply circuit; and a DA converter adapted for delivering binary digital signals to the constant-voltage power supply circuit.