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:
Sep. 30, 1997
Filed:
Jul. 10, 1995
Nicholas Allen, Bedford, MA (US);
Abdu Broudour, West Newton, MA (US);
Sergey Broude, Newton Centre, MA (US);
Eric Chase, Carlisle, MA (US);
Carl Johnson, Tewksbury, MA (US);
Pascal Miller, North Chelmsford, MA (US);
Jay Ormsby, Salem, MA (US);
Arkady Savikovsky, Brookline, MA (US);
QC Optics, Inc., Burlington, MA (US);
Abstract
A surface displacement detection system including a detector for detecting displacement of a surface in a direction normal to the surface as the surface revolves; an encoder which divides the surface into N sectors; a signal processor responsive to the detector for calculating the amount of displacement of the surface in each sector of the surface as it revolves; a displacement value look-up table; and a routine for writing to the table a displacement value for each sector once per M revolutions, and an adjustment system including a focussing actuating element, a routine to read displacement value look-up table, a routine to for updating the position of the focussing actuating element for every sector, according to the displacement values stored in the look-up table.