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. 22, 2005
Filed:
Mar. 19, 2003
Sonko Osawa, Tsukuba, JP;
Toshiyuki Takatsuji, Tsukuba, JP;
Tomizo Kurosawa, Tsukuba, JP;
Hironori Noguchi, Tsukuba, JP;
Jiang Hong, Tsukuba, JP;
Sonko Osawa, Tsukuba, JP;
Toshiyuki Takatsuji, Tsukuba, JP;
Tomizo Kurosawa, Tsukuba, JP;
Hironori Noguchi, Tsukuba, JP;
Jiang Hong, Tsukuba, JP;
Abstract
A laser tracking interferometric length measuring instrument has a laser source and a tracking articulating optical lever provided on an optical path of an interferometric optical system. To track a retroreflector, the optical lever reflects a laser beam at the retroreflector, which reflects the beam back to the optical lever. This beam is reflected onto a quadrant photodiode. An attitude control means is used to control the attitude of the optical lever so that the laser beam reflected by the optical lever falls on the neutral point of the photodiode.