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. 16, 2002
Filed:
Jul. 09, 2001
Hideo Yoshida, Saitama, JP;
Yoshikazu Mihara, Saitama, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
When the reflectance of an object at a distance to be measured is low and when the distance to the object is far, these conditions are discriminated and the distance is measured with a clamp signal set at a low level, thereby enhancing distance measurement accuracy. First a distance measurement is carried out with the clamp signal set at a high level. When the first distance value is larger than a predetermined distance, a second distance measurement is carried out with the clamp signal set at the low level. Then it is determined whether the second distance value is larger than a set value. When the second distance value is larger than the set value, the clamp signal is set to the high level and third a distance measurement is carried out. When the second distance value is not larger than the set value, on the other hand, the clamp signal is set to the low level under certain conditions and the third distance measurement is carried out.