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:
Dec. 10, 2002
Filed:
Jul. 10, 2000
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A device according to the invention is suitable for scanning an information carrier with tracks around an axis. The device has means for transferring information to/from a scanning spot on the information carrier. The device has tangential displacement means for moving the scanning spot in a tangential direction and radial displacement means for moving the scanning spot in a radial direction. The device has control means for controlling the radial displacement means and radial position measurement means for generating a radial position signal (cos(9&bgr; ), sin(9&bgr; )) which is a measure of the instantaneous radial position of the scanning spot. The device has a scanning mode in which the scanning spot follows a track and a displacement mode in which tracks are crossed. The device according to the invention is characterized by tangential position detection means for generating a tangential position signal (S ) which is indicative of the tangential position (&agr;) of the scanning spot. With the aid of the control means it is achieved that in the displacement mode the scanning spot is moved in a radial direction. The displacement is effected in a time interval having a radial displacement time (T ) which is a function of the difference between a desired tangential position (&agr; ) and an instantaneous tangential position (&agr; ).