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. 21, 2003
Filed:
Apr. 24, 2001
Tokinori Furuichi, Yokohama, JP;
Yuji Hirai, Hiratsuka, JP;
Hiroyuki Hayashi, Hitachinaka, JP;
Gohshi Jin, Hitachinaka, JP;
Kazuhiro Oda, Hitachinaka, JP;
Naomi Nomura, Yokohama, JP;
Seiji Inaba, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The present invention provides a single information recording and reproducing apparatus that is used to record data to multiple disks that are to be recorded on using different wavelengths. More specifically, the present invention provides an apparatus that accurately discriminates disk types while preventing disk damage and accidental recording of data during the disk type discrimination operation. The disk type is determined using the intensity of light reflected from the disk. Information is encoded using an encoder corresponding to the disk type. The resulting signal is used to drive a laser corresponding to the disk type, and information is recorded.