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:
Oct. 29, 2002
Filed:
Nov. 30, 2000
Yasuhiro Miwa, Omiya, JP;
Tatsuo Saito, Omiya, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
Reflected light of each light beam projected toward an object at a distance to be measured is detected to provide a far signal and a near signal, and the far signal is compared with a preset clamp signal. The larger signal resulting from the comparison is outputted from a clamping circuit and a ratio of the output signal and the near signal is calculated to obtain an output ratio signal. Output ratio signals for light emissions from a light projecting unit are accumulated in an integration to produce an integral signal. The integral signal is transformed to a distance signal according to the distance by transformation equations selected based on whether the number of clamp signals outputted as output signals from the clamping circuit during the integration is larger than a set number. Ranging accuracy is improved by transforming the integral signal to the distance signal according to the distance by the transformation equations based on whether the number of clamp signals outputted as output signals from the clamping circuit during the integration of output ratio signals is larger than the set number.