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:
Jun. 12, 2007
Filed:
Oct. 24, 2003
Jen-yu Hsu, Taipei, TW;
Hsiang-yi Fu, Taipei, TW;
Tun-chieh Lee, Taipei, TW;
Fu-hsiang Chen, Taipei, TW;
Yao-chou Tsai, Taipei, TW;
Jen-Yu Hsu, Taipei, TW;
Hsiang-Yi Fu, Taipei, TW;
Tun-Chieh Lee, Taipei, TW;
Fu-Hsiang Chen, Taipei, TW;
Yao-Chou Tsai, Taipei, TW;
Lite-On IT Corporation, Taipei, TW;
Abstract
The present invention discloses a system for speed error compensation. A predetermined speed signal subtracts a feedback speed signal to generate a speed error signal, and a microprocessor receives the speed error signal and outputs a calculated result. A feedback controller receives the calculated result and generates a first tracking control effort signal. A feedforward controller receives the speed error signal and generates a second tracking control effort signal according to a DC steady state error in the speed error signal. An optical head module moves at an actual speed determined by the total of the first tracking control effort signal and the second tracking control effort signal. A gain controller generates the feedback speed signal according to an actual speed signal detecting from the actual speed.