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:
Feb. 23, 1999
Filed:
Mar. 13, 1996
Hisatoshi Baba, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical information recording and/or reproducing apparatus, for performing at least one of recording and reproduction of information as irradiating a recording medium with a light beam, includes an actuator for moving the light beam relative to the medium, a position detecting circuit for detecting a position of the actuator, a circuit for generating a relative position error signal of the light beam to the medium, a control loop for controlling the actuator in accordance with the relative position error signal, a filter for differentiating an output from the position detecting circuit, and an adder for adding an output from the filter to a signal in the control loop. Another optical information recording and/or reproducing apparatus includes an actuator for moving the light beam relative to the medium in a direction traversing the tracks of the medium, a velocity detecting circuit for detecting a velocity of the actuator and outputting a real velocity signal, a circuit for generating a target moving velocity of the light beam, a control loop for controlling the velocity of the actuator, based on the real velocity signal and target velocity signal, a filter for differentiating the real velocity signal, and an adder for adding an output from the filter to a signal in the control loop.