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. 17, 2015
Filed:
Jan. 28, 2011
Takehiro Tachizaki, Yokohama, JP;
Masahiro Watanabe, Yokohama, JP;
Tatsuo Hariyama, Yokohama, JP;
Yasuhiro Yoshitake, Yokohama, JP;
Tetsuya Matsui, Hitachi, JP;
Hirokazu Matsumoto, Tsukuba, JP;
Kiyoshi Takamasu, Musashino, JP;
Takehiro Tachizaki, Yokohama, JP;
Masahiro Watanabe, Yokohama, JP;
Tatsuo Hariyama, Yokohama, JP;
Yasuhiro Yoshitake, Yokohama, JP;
Tetsuya Matsui, Hitachi, JP;
Hirokazu Matsumoto, Tsukuba, JP;
Kiyoshi Takamasu, Musashino, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Disclosed is a distance measuring device using an optical comb. In order for the absolute distance to an object to be measured which has a surface with low reflection ratio or a scattering surface and is approximately 10 m apart, to be easily measured with accuracy of 0.1 mm or more using an optical and contactless method, the distance measuring device which measures the distance to the object to be measured is configured such that the distance to the object to be measured is measured by comparing the phase of the beat signal between a light source and a plurality of CW lasers which are reflected or scattered by the object with the phase of the beat signal between the light source and a plurality of CW lasers prior to being irradiated onto the object.