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:
May. 09, 1995
Filed:
Dec. 14, 1993
Applicant:
Inventors:
Kunihiko Shimada, Tsurugashima, JP;
Shuichi Yanagisawa, Tsurugashima, JP;
Satoru Tanaka, Tsurugashima, JP;
Assignee:
Pioneer Electronic Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ; G11B / ;
U.S. Cl.
CPC ...
3692752 ; 3692753 ;
Abstract
A recordable optical disk is provided with: a disk substrate having a recording surface; a track portion, which is coaxially or spirally arranged on the recording surface, and to which the information is recorded by irradiating a light beam modulated in correspondence with the information, thereonto; and an interval portion disposed on the recording surface between adjacent turns of the track portion on the recording surface. The reflection coefficient of the interval portion is higher than the reflection coefficient of the track portion.