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:
Apr. 01, 1997
Filed:
Jan. 10, 1995
Katsumi Iijima, Yokohama, JP;
Shigeyuki Taniwa, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention realizes to increase a recording density in an optical information recording medium. The recording medium on which multi-value digital information is recorded includes a mark for forming an identification signal for identifying values of the multi-value digital signal from a reproduction signal obtained upon reproduction of the information recorded in the recording medium. An optically information recording/reproducing method according to the present invention has an information recording step and an information reproducing step. In the information recording step, a reference mark and multi-value digital information are recorded on the recording medium. The reference mark is to form an identification signal used for identifying values of the multi-value digital information from a reproduction signal optically detected from the recording medium. In the information reproducing step, the identification signal is formed from the reference mark and the values of the multi-value digital information is identified from the reproduction signal by the use of the identification signal, and thereby the multi-value digital information is reproduced.