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:
Mar. 31, 1981
Filed:
Sep. 20, 1978
Applicant:
Inventor:
Norio Fukuoka, Hachioji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B / ; H03J / ;
U.S. Cl.
CPC ...
455159 ; 334 36 ;
Abstract
Disclosed is a tuning indicator circuit including a receiver in which an output signal voltage of a detector circuit of the receiver is compared with a reference voltage from a voltage divider by means of a voltage comparator, whereby a tuned or untuned state of the receiver will be detected. The tuned or untuned signal is applied to a light emitting diode driver circuit via an AND circuit, together with a light emitting diode driving signal from an oscillator. The driving circuit allows a light emitting element for power supply and tuning indication to be continuously on in a tuned state, and turns the element on and off in a untuned state with power on.