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:
Jul. 14, 1987
Filed:
Sep. 13, 1984
Hiroo Fujita, Tanashi, JP;
Citizen Watch Co., Ltd., Tokyo, JP;
Abstract
A micro-dimensional measurement apparatus for precise non-contact measurement of distances between edges formed upon a surface, basically comprising an acousto-optical element for scanning a light beam across the surface with the scanning distance varying in accordance with a deflection voltage, a photo-sensor for sensing the intensity of resultant light reflected from the surface, and a data-processing circuits for determining when the rate of change of the reflected light intensity reaches maximum values, corresponding to positions of surface edges, and for measuring the distance between a pair of edges on the surface based upon a change in the deflection voltage occurring between the corresponding two maximum values.