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:
Mar. 10, 1992
Filed:
Oct. 16, 1990
Shinichi Sato, Kawasaki, JP;
Takeshi Ishii, Ichikawa, JP;
Tamotsu Takahashi, Shiki, JP;
Yoshihiro Oyama, Koriyama, JP;
Tatsuo Sasaki, Tokyo, JP;
Mitsuo Watanabe, Yokohama, JP;
Ichiro Shinoda, Kawasaki, JP;
Hiroaki Katoh, Sagamihara, JP;
Nobuyuki Kitamura, Zama, JP;
Motohiko Ito, Tokyo, JP;
Tomoyuki Kashiwazaki, Kawasaki, JP;
Hiroaki Kawai, Yokohama, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An article detection device includes: a light emission unit for emitting a detection light for irradiation onto an article, and a light reception unit for receiving a light reflected from the article. The article detection device also includes; an analog-to-digital converter for converting the reflected light to a digital signal, a first register for storing the digital signal after being sampled using a first sampling signal having a first period, and a second register for storing the digital signal after being sampled using a second sampling signal having a second period shorter than the first period. The article detection device further includes a control unit for generating the first and second sampling signals to be sent to the first and second registers, reading the digital signal stored in the first and second registers, calculating a difference between the digital signals in the first register and second register, comparing an absolute value of the difference with a predetermined threshold value, and detecting the article when the absolute value is larger than the threshold value.