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. 01, 2011
Filed:
May. 12, 2009
Johannes Leopoldus Bakx, Taipei, TW;
Johannes Leopoldus Bakx, Taipei, TW;
Lite-On It Corporation, Taipei, TW;
Abstract
The optical scanning device [] is arranged for scanning a record carrier []. The record carrier has an outer face []. The scanning device comprises a radiation source [] for generating a radiation beam [] and an objective system [] having an exit face [] arranged for evanescent coupling of the radiation beam between the exit face and the outer face and for converging the radiation beam to a focus []. A tilt measuring system [] provides a tilt signal [] representing a tilt angle between the objective system and the record carrier. A control unit [] determines a distance signal representing a distance between the exit face and the focus from the tilt signal.