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:
Apr. 11, 1978
Filed:
Oct. 19, 1976
Motoi Iyeta, Hamakita, JA;
Nippon Gakki Seizo Kabushiki Kaisha, Hamamatsu, JA;
Abstract
In a linear tracking pickup apparatus of a record player, a video disc player and the like wherein a pickup arm is swingably and pivotally supported on a gimbal support mechanism, a device for detecting an offset angle of the pickup arm comprising: a light-reflecting surface formed on a portion of a first frame as a part of the surface of this portion, which first frame being a portion of the gimbal support mechanism and swingable with the horizontal swing of the pickup arm; a light-emitting source fixed to a second frame, not swingable but only linearly movable, of the gimbal support mechanism so as to face the light-reflecting surface; and a photo-sensitive element fixed to the second frame for receiving the light rays reflected by the light-reflecting surface. This arrangement is free of any such eccentric load otherwise placed additionally on the pickup arm via its support mechanism on which a detector is to be mounted in the conventional art, and a desirable lateral balance of the pickup arm is maintained throughout the reproduction.