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. 05, 1985
Filed:
Aug. 31, 1981
Bruce E Truax, Durham Township, Middlesex County, CT (US);
AT&T Technologies, Inc., New York, NY (US);
Abstract
A narrow beam of light (26) is directed at a beamsplitter (12) at an incident angle (.theta.) thereto. A portion (28) of the beam (26) passes through the beamsplitter (12) and is reflected from a first mirror (22) while a portion (29) of the beam (26) is reflected from the beamsplitter (12) and directed onto and reflected by a second mirror (24). The beams (28, 29) reflected from the first and second mirrors (22, 24) intersect at a reference plane (R). The incident angle .theta. of the light beam (26) is then varied until the reflected beams intersect on the surface of an object (32) along the plane of symmetry of the system. The known variation of the incident angle, .DELTA..theta., provides sufficient information to determine the distance of the surface of the object (32) from the reference plane (R). The object 32 is then moved in an incremental fashion and .DELTA..theta. determined for each step to ascertain the surface profile of the object.