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:
Nov. 08, 2011
Filed:
Feb. 01, 2006
Katsuichi Inoue, Daito, JP;
Katsuichi Inoue, Daito, JP;
Funai Electric Co., Ltd., Osaka, JP;
Abstract
A defocus adjustment method includes a step of storing in a memory a range of defocus values for smooth operation of an optical disc apparatus, a step of measuring the defocus value of the optical disc loaded in the optical disc apparatus, a step of comparing the defocus value and the range of defocus values, a step of determining the optimal defocus value, and a step of using the optimal defocus value as a focusing bias value. This helps easily and quickly perform defocus adjustment that suits the loaded optical disc. Using as a focus bias value the defocus value determined through the defocus adjustment helps enhance the quality with which data is read from and data is written to the optical disc.