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:
Nov. 10, 1998
Filed:
Oct. 08, 1996
Applicant:
Inventors:
Naoyasu Miyagawa, Kawanishi, JP;
Yoshito Aoki, Moriguchi, JP;
Takashi Ishida, Yawata, JP;
Shunji Ohara, Higashiosaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
3692752 ; 3692753 ;
Abstract
A read-only zone or control zone is formed in an optical information recording medium wherein information signal are formed in both grooves and lands. Grooves are not formed in the control zone or read-only zone, and read-only data such as control data, audio-video data, or computer data is pre-recorded as a sequence of pre-formed pits on the track center line. The track pitch of the pre-formed pit sequences in the control zone or read-only zone is equal to the groove pitch in the read-write zones.