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:
Feb. 03, 2009
Filed:
Apr. 29, 2008
Chun-chieh Huang, Taipei, TW;
Chen-i Kuo, Taichung, TW;
Hsiang-chieh Yu, Taipei, TW;
Jau-jiu Ju, Chu-Tung, TW;
Chi-lone Chang, Hsinchu County, TW;
Yuan-chin Lee, Hsinchu, TW;
Chau-yuan KE, Pingtung County, TW;
Chun-Chieh Huang, Taipei, TW;
Chen-I Kuo, Taichung, TW;
Hsiang-Chieh Yu, Taipei, TW;
Jau-Jiu Ju, Chu-Tung, TW;
Chi-Lone Chang, Hsinchu County, TW;
Yuan-Chin Lee, Hsinchu, TW;
Chau-Yuan Ke, Pingtung County, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
An optical head to access data on an optical recording medium, which has two data storage densities, includes two sets of optical path systems to provide two optical paths that are crossed. Each optical path system includes a laser light generation unit, a light guiding unit, a converging objective lens and a photo detector. The light guiding unit is located on the optical path of the laser light generation unit, to direct the laser light to pass through the converging objective lens and focus on the data side of the optical recording medium to carry optical data signals from the data side. The laser light returns to the light guiding unit and travels along the optical path and is received by the photo detector.