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:
Oct. 18, 2005
Filed:
Jan. 15, 2002
Junji Tanaka, Tokorozawa, JP;
Junji Tanaka, Tokorozawa, JP;
Pioneer Corporation, Tokyo-to, JP;
Abstract
When record information is recorded on a recording medium with recording control information pre-recorded thereon by forming pre-pits so that the recording control information will be used to control the recording of the record information to be recorded on the recording medium, a first light beam having first power and a second light beam having second power different from the first power are irradiated to the pre-pits on a time-shared basis according to the record information to generate read signals generated from electrical signals according to the amounts of reflected light of the respective beams so that the pre-pits will be detected from inputs of the read signals. In this configuration, the pre-pits are detected from only the read signals input during a period of irradiation of the second light beam.