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:
Aug. 25, 2009
Filed:
Jan. 24, 2006
Junsaku Nakajima, Kashihara, JP;
Hitoshi Takeuchi, Kitakatsuragi-Gun, JP;
Masaru Nomura, Nabari, JP;
Kenji Ohta, Kitakatsuragi-Gun, JP;
Junsaku Nakajima, Kashihara, JP;
Hitoshi Takeuchi, Kitakatsuragi-Gun, JP;
Masaru Nomura, Nabari, JP;
Kenji Ohta, Kitakatsuragi-Gun, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An optical disk has a lead-in region provided at the inner circumference side and a user region provided at the outer circumference side. Pit stringof pits of different depths is formed in the lead in region. Light beam reflected from the pit string is detected by detector and TPP and RF signals are output by differential amplifier and addition amplifier. A ternary signal is restored from pits based on the TPP and RF signals. Information is recorded by pits of the same depth in the user region. Recording information in the depth direction in the lead-in region increases the recording capacity thereof. The information recorded in the depth direction in the lead-in region cannot be transferred to a user region of another optical disk.