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:
Jun. 22, 1999
Filed:
Sep. 15, 1993
Fumihiko Yokogawa, Kawagoe, JP;
Pioneer Electronic Corporation, Tokyo-to, JP;
Abstract
There is disclosed a double density recording method for a constant angular velocity type optical disk in which a data information area for recording data information and a servo information area for recording servo control information are provided in recording tracks of the optical disk, pairs of wobble pits for tracking servo control being provided in a staggered form in the servo control area in such a manner that the center axes of the recording tracks are put between the respective pairs of wobble pits, the method being adapted to carry out a subtractive operation of reflected light signals from the respective wobble pits to generate a tracking error signal to thereby conduct a tracking servo control, and to record data information under such a tracking servo control, wherein the respective pair of wobble pits are provided in such a manner that they are shared as wobble pits of adjacent recording tracks, and the wobble pits are provided in a staggered form in a radial direction of the optical disk.