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:
Aug. 01, 1989
Filed:
Jun. 17, 1986
Satoru Maeda, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kanagawa, JP;
Abstract
Pick-up control circuits for disc information reproducing apparatus. The apparatus includes a carriage, a source of a light beam mounted in the carriage, a focus lens for placing the light beam on a disc, the focus lens being mounted on a standard position in the carriage but movable by a prescribed range from the standard position, a circuit for detecting a tracking error signal responsive to a deviation of the light beam from a center of the track, a lens actuator for driving the focus lens to deviate from the standard position, a carriage actuator for driving the carriage to move in the radial direction in respect of the disc, a power source for applying a drive voltage to the carriage actuator, a switch connected between the power source and the carriage actuator, and a circuit for controlling the switch to apply the drive voltage intermittently to the carriage actuator, so that focus lens is moved to the standard position on or before reaching an end of the movable range.