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. 12, 1993
Filed:
May. 28, 1991
Toshihiro Komaki, Saitama, JP;
Hideo Kudo, Saitama, JP;
Tomonori Ishizuki, Saitama, JP;
Ryoichi Hirota, Saitama, JP;
Masahiro Katsumura, Saitama, JP;
Seishi Maita, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
On the phase change optical information recording medium, a plurality of protection pits each smaller than one pit on the pre-pit region are provided over the entire data region of the recording film at least on its surface. Therefore, even when overwriting is repeatedly performed, the reproduced data waveform is distorted less frequently and data error is reduced. By forming the group of protection pits, the adhesive strength between the phase change recording film and the protective film can be increased, and the reliability of exfoliating strength can be improved.