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:
Oct. 12, 1976
Filed:
Jul. 10, 1975
Yasuhiro Yamada, Neyagawa, JA;
Kazuyoshi Tsukamoto, Hirakata, JA;
Yoshiaki Sakauchi, Tenri, JA;
Kazufumi Ushijima, Hirakata, JA;
Sanyo Electric Co., Ltd., Osaka, JA;
Abstract
An automatic tuning apparatus comprising a tuner having a tank circuit employing a voltage controlled variable capacitance diode as a circuit element, which diode is supplied in the reverse direction with a scanning control voltage from a solid state potential memory device, which control voltage is varied under the control of a scanning voltage control circuit to scan the frequencies in the frequency band by the tuner and is set by a scan stop signal obtained from the tuner as a result of tuning of the tuner to a certain frequency, and a pair of manual switches for upward and downward scanning, a first flip-flop to be reset by the closing of either manual switch and to be set by the scan stop signal, a second flip-flop to be set and reset by the closing of the downward and upward scanning switches, respectively, a third flip-flop to be set and reset by the closing of both manual switches and caused to be reversed in the storing state thereof when the scanning voltage reaches the maximum or minimum value thereof, the said scanning voltage control circuit being controlled by the logical combination of the storing state of these flip-flops such that the frequency is scanned gradually in the direction as selected by the manual switch but rapidly in the direction not selected by the switch.