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:
May. 27, 1980
Filed:
Sep. 18, 1978
Shizuo Inaba, Tokorozawa, JP;
Yoshihisa Hirota, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A tone arm drive device, comprises a tone arm drive mechanism driven by an electric motor rotatable in forward and reverse directions to vertically move and horizontally swing a tone arm. A first flip-flop circuit is triggered by signals instructing elevation and descent of said tone arm and a first logical gate generates an output of a logical product of a signal instructing a lowering position of the tone arm and an output signal of the first flip-flop circuit. A detecting circuit is employed to sense the upward movement limit point of said tone arm. A set-reset type flip-flop circuit receives an output from the first logical gate and an output of the detecting circuit as a 'set' input and a 'reset' input, respectively. A second logical gate is used for generating a logical product output of an output signal of the first flip-flop circuit and an output signal of the set-reset type flip-flop, with the output signal thereof being employed as a tone arm vertical movement control signal.