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:
Dec. 09, 2014
Filed:
Jun. 20, 2012
Ken-ichiro Yoshino, Tokyo-to, JP;
Kaoru Kumagai, Tokyo-to, JP;
Mitsuru Kanokogi, Tokyo-to, JP;
Masae Matsumoto, Tokyo-to, JP;
Ken-ichiro Yoshino, Tokyo-to, JP;
Kaoru Kumagai, Tokyo-to, JP;
Mitsuru Kanokogi, Tokyo-to, JP;
Masae Matsumoto, Tokyo-to, JP;
Kabushiki Kaisha TOPCON, Tokyo-to, JP;
Abstract
An electronic distance measuring instrument comprises a pulsed light emitting light source, means for creating a distance measuring pulsed light and an internal reference pulsed light, a photodetector for detecting the pulsed lights, and a measuring unit for calculating a distance to an object to be measured based on a photodetection signal. The measuring unit performs coarse distance measurement based on difference of photodetection time between the internal reference pulsed light and the distance measuring pulsed light, carries out Fourier function transform on photodetection waveform of the pulsed lights respectively, separates the waveforms to a plurality of frequency components, obtains phase difference for each of the frequency components acquired, performs fine distance measurement based on time difference acquired from phase difference, and measures a distance to the object by adding a result of coarse distance measurement to a result of fine distance measurement.