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. 22, 1988
Filed:
Oct. 06, 1986
Yoshikiyo Konno, Tokorozawa, JP;
Takashi Suzuki, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A device for controlling the movement of a focal point of a light beam for detecting recorded information on a recording medium, comprises a focus actuator connected to a focal lens for focusing the light beam on the recording medium, a drive amplifier for generating a drive current of the focus actuator, a photo detector for generating a focus error signal, a starting signal generating means for generating a starting signal, and a switching means for selectively applying either the focus error signal or the starting signal to the drive amplifier. The circuit construction and the stability of the operating characteristic are simplified by using a ramp signal whose level increases with time, as the starting signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile