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:
Apr. 07, 2009
Filed:
Jan. 04, 2005
Andrew L Van Brocklin, Corvallis, OR (US);
D. Mitchel Hanks, Ft. Collins, CO (US);
Greg J. Lipinski, Ft. Collins, CO (US);
Andrew L Van Brocklin, Corvallis, OR (US);
D. Mitchel Hanks, Ft. Collins, CO (US);
Greg J. Lipinski, Ft. Collins, CO (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
Focus calibration in an optical drive. Optics are moved with respect to a disc in the optical drive. A first interface of the disc is optically detected at a first distance, and a first drive signal value is detected at the first interface. A drive signal change is determined using a second drive signal value at a second distance. A gain is determined using the drive signal change and a thickness associated with the first and second distances.