Article detection device and method with shift registers and sam

Details Article detection device and method with shift registers and sam Article detection device and method with shift registers and sam

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.

REFERENCES:
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.
patent: 4694182 (1987-09-01), Howard
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.

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