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. 13, 1999
Filed:
Jul. 10, 1997
Applicant:
Inventor:
Haozhe Dong, Plymouth, MN (US);
Assignee:
Banner Engineering Corporation, Minneapolis, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
G01B / ;
U.S. Cl.
CPC ...
356375 ; 356-304 ; 250205 ; 25055931 ; 25055938 ;
Abstract
A distance sensing system employs an optical triangulation system and a position sensitive device (PSD). The PSD generates a pair of current signals when a target reflects light from a light source back to the surface of the PSD. An automatic power control circuit is used to keep one of the current signals a constant value. The position of the reflected light spot on the PSD is linearly proportional to the other current generated by the PSD according to the formula: