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:
Jan. 31, 2006
Filed:
May. 23, 2002
Shuji Yamaoka, Hiroshima, JP;
Shogo Ishioka, Hiroshima, JP;
Shuji Yamaoka, Hiroshima, JP;
Shogo Ishioka, Hiroshima, JP;
OHT Inc., Hiroshima, JP;
Abstract
Disclosed is an apparatus and method for detecting positional displacement of a board. A boardhaving a surface formed with a conductive patternis transferred in a direction A while supplying an AC signal from a power supply sectionto the surface of the board. The level of positional displacement of the board is detected in accordance with the transfer speed of the board and the difference between the timings of the intermediate signal levels generated when the AC signal is sensed by a pair of position sensorsopposed to the leading edge of the board. The present invention allows positional displacement of the board to be detected in a simple non-contact structure while maintaining a high degree of accuracy without variation over time.