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:
Mar. 18, 2008
Filed:
Oct. 28, 2004
Takanori Kishida, Ogaki, JP;
Tsuyoshi Yamamoto, Ota, JP;
Katsumi Hattori, Kiryu, JP;
Masato Fuma, Ichinomiya, JP;
Hiroshi Watanabe, Gifu, JP;
Takanori Kishida, Ogaki, JP;
Tsuyoshi Yamamoto, Ota, JP;
Katsumi Hattori, Kiryu, JP;
Masato Fuma, Ichinomiya, JP;
Hiroshi Watanabe, Gifu, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
An object of the present invention is to provide an optical recording/reproducing apparatus capable of improving medium usability through a laser power adjusting process while keeping compatibility with a read only type medium. The optical recording/reproducing apparatus adjusts laser power using a PCA till the PCA is used up. After the PCA is used up, an additional area is reserved at the outermost circumference position, thereafter when the additional area is used up, a new additional area is reserved at an inner circumference side of the used up additional area to adjust laser power. The additional area is reserved at an outer circumference than a lead-out area, and therefore format compatibility with a read only type optical disc can be maintained. The additional area is reserved only when the PCA is used up, thus capacity compatibility with a read only type optical disc can be maintained while laser power is adjusted with only the PCA.