Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-10-16
1992-03-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250221, 250214B, 250566, G01V 904, H01J 4014, G06K 710
Patent
active
050952030
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.
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patent: 4061925 (1977-12-01), van der Gaag et al.
patent: 4315159 (1982-02-01), Niwa et al.
patent: 4681432 (1987-07-01), Kawabata et al.
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patent: 4840069 (1989-06-01), Hampton et al.
patent: 4879461 (1989-11-01), Philipp
IBM Technical Disclosure Bulletin, Sep. 1989, vol. 32, No. 4B, N.Y., U.S., p. 15.
Ishii Takeshi
Ito Motohiko
Kashiwazaki Tomoyuki
Katoh Hiroaki
Kawai Hiroaki
Fujitsu Limited
Messinger Michael
Nelms David C.
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