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:
Mar. 23, 2004
Filed:
Aug. 31, 2001
Bruno La Fontaine, Pleasanton, CA (US);
Jongwook Kye, Pleasanton, CA (US);
Harry Levinson, Saratoga, CA (US);
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Abstract
An optical tool includes a tool body that is transparent to light. Pluralities of parallel opaque lines on the body form a first outline in the shape of the square, and a second outline in the shape of a square which is centrally located relative to and within the first-mentioned square. Each pair of adjacent parallel lines has therebetween a first region that allows transmission of light therethrough without changing phase thereof, and a second region alongside the first region that allows transmission of light therethrough while shifting the phase thereof by 90°. The phase shifting and non-phase shifting regions are positioned so that the images of the outlines provided by a lens on an object shit in position a substantial amount as the distance between the lens and the object is changed.