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:
Jan. 29, 1991
Filed:
Sep. 26, 1989
Shigeru Aoi, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical information processing method comprises a step of recording and/or reproducing information by irradiating a light beam to a periodically relatively moving record medium, detecting focusing and/or tracking servo signals and driving auto-focusing and/or auto-tracking means in accordance with the detected servo signals, a step of storing detected servo signals of at least one period of the movement of the medium, and a step of stopping the irradiation of the light beam to the medium and driving the auto-focusing and/or auto-tracking means in accordance with the stored ervo signals. An optical information processing apparatus for embodying the above method comprises a device for irradiating a light beam to an optical information record medium, a device for periodically moving the record medium relative to the light beam, a device for detecting focusing and/or tracking servo signals from the light beam reflected by or transmitted through the medium, auto-focusing and/or auto-tracking device, a feedback circuit for feeding the detected servo signal back to the auto-focusing and/or auto-tracking device, a device for storing the detected servo signals of at least one period of movement of the medium, and control device for deactivating the feedback circuit and activating the auto-focusing and/or auto-tracking device in accordance with the signals stored in the storage device when the irradiation of the light beam to the medium is stopped.