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. 06, 2021
Filed:
Jun. 27, 2019
Mitutoyo Corporation, Kanagawa, JP;
Yoshiaki Kato, Urayasu, JP;
MITUTOYO CORPORATION, Kawasaki, JP;
Abstract
There is provided a signal processing method, for a photoelectric encoder, capable of correctly determining a bright part and a dark part of a bright/dark pattern having distorted light intensity distribution by setting an appropriate threshold. A detector unit includes a light source, a light-receiving detector that receives transmitted light from a scale to acquire a bright/dark image, and a lens arranged between the light source and the light-receiving detector. The detector unit classifies the bright/dark image acquired by the light-receiving detector into an image-forming region corresponding to a center region of the lens and a non-image-forming region corresponding to a region except for the center region of the lens, calculates a representative value reflecting a light intensity of the image-forming region, and obtains a pre-processed bright/dark image in which the light intensity of the non-image-forming region is replaced with the representative value.