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:
Jan. 22, 2019
Filed:
Sep. 02, 2016
Mitutoyo Corporation, Kawasaki, Kanagawa, JP;
Toru Yaku, Kawasaki, JP;
MITUTOYO CORPORATION, Kawasaki, JP;
Abstract
A scale includes a grating pattern arranged in a measurement direction. A detection head can be moved relative to the scale in the measurement direction and outputs an electric signal indicating a result of detection of the pattern. An operation unit calculates a relative displacement of the detection head relative to the scale. The detection head irradiates the scale with light. A light-receiving unit includes a light-receiving element array arranged in the measurement direction and outputs a result of detection of the irradiation light applied to the light-receiving element array as the electric signal. An optical system forms light from the scale into interference fringes on a light-receiving surface of the light-receiving unit by using lens arrays arranged in the measurement direction. A lens array pitch between neighboring lenses of the lens arrays is not equal to an integral multiple of a pitch of the grating pattern.