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. 27, 1993
Filed:
Mar. 30, 1990
Shigeto Kanda, Machida, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
There is disclosed an information recording disk, and a method and apparatus for information recording and reproduction, enabling secure tracking and full utilization of the recording capacity. For this purpose, a spiral or concentric track divided into plural sectors is provided with servo signals for detecting tracking error, by an integral number per sector, and the number is made different between the tracks in the radially inner area of the disk and those in the outer area. The disk is rotated at a constant angular velocity, and the tracking error is detected by the servo signals with a first clock signal of a constant frequency, while the information recording and/or reproduction is conducted with a second clock signal having a frequency higher for the tracks in the outer area of the disk.