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:
Aug. 22, 2006
Filed:
Jan. 14, 2004
Fumio Ohtomo, Tokyo, JP;
Kaoru Kumagai, Tokyo, JP;
Kenichiro Yoshino, Tokyo, JP;
Kabushiki Kaisha TOPCON, Tokyo, JP;
Abstract
An electric distance meter of the present invention comprises a device () to generate a modulation signal for modulating measuring light which is irradiated to an object, a device () to periodically generate an intermittent pulse signal for generating intermittent modulated measuring light by intermittently adding the modulation signal to a light emitting element (), a device (A) to generate an internal frequency signal (S) with a frequency different from the modulation signal (S), a light receiving element () for outputting a light receiving signal by receiving the intermittent modulated measuring light, a device () to generate an intermittent difference frequency signal (S) by inputting the light receiving signal (S) and the signal (S), an arithmetic logical unit () for calculating a distance to the object based on a phase difference between a phase of the signal (S) output from the device () and a phase of the intermittent difference frequency signal obtained through a reference optical path.