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:
Jul. 23, 1996
Filed:
May. 15, 1995
Takayuki Nomoto, Tokorozawa, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
Disclosed is an optical disk having at least one pit in each of unit areas continuously provided in a circumferential direction of the disk, said pit having a depth of at least one of n depths (n: an integer equal to or greater than 2). Also disclosed is an information reproducing method of reproducing pit information from such an optical disk. This method comprises the steps of irradiating a read beam having frequency components of n wavelengths corresponding to four times the n depths to a row of the unit areas, and acquiring pit information based on an intensity distribution in a plane perpendicular to the optical axis of a reflected beam from the row of unit areas.