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. 20, 2010
Filed:
Feb. 15, 2006
Teppei Asano, Shiga, JP;
Shuhei Kato, Shiga, JP;
Teppei Asano, Shiga, JP;
Shuhei Kato, Shiga, JP;
SSD Company Limited, Kusatsu-Shi, Shiga, JP;
Abstract
There are provided an infrared light emitting diodeoperable to emit light in a predetermined cycle; a phototransistoroperable to receive light which is emitted by the infrared light emitting diodeand reflected from a retroreflective sheetof the operation article, and output a light reception signal 'Sp'; and a highpass filter unitoperable to pass a high frequency component of the light reception signal 'Sp', output the high frequency component as a light reception signal “Ss” and operable to generate a reference voltage. The highpass filter unitsupplies the reference voltage to a node to which the light reception signal “Ss” is output, and the processorcounts the number of pulses included in the light reception signal “Ss”, and calculates the speed of the operation article