Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Patent
1994-01-11
1995-09-05
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
250566, G01N 2186
Patent
active
054480787
ABSTRACT:
Scan units scan top surfaces of articles A and B with a laser beam as they are transported by a conveyor belt. The scan units are capable of changing the focal position of the laser beam within a predetermined range. Changing the focal position of the laser beam requires a predetermined response time. The heights of articles A and B are detected by a height detection unit in an amount of time equal to or less than the response time before they are scanned by the laser beam. When the heights of the articles as detected by the height detection unit change, a control unit will change at predetermined time intervals the focal position of the laser beam that is generated by each of the scan units. This allows the top surfaces of articles A and B, which are transported at short time intervals, to be scanned efficiently with the focused laser beam, permitting the efficient reading of bar codes and any other symbols that are formed on the top surfaces of articles A and B.
REFERENCES:
patent: 4417817 (1983-11-01), Bohme et al.
patent: 4578571 (1986-03-01), Williams
patent: 5122644 (1992-06-01), Hasegawa et al.
patent: 5266810 (1993-11-01), Murphy
patent: 5308966 (1994-05-01), Danielson et al.
Nelms David C.
Nichols Steven L.
Sumitomo Electric Industries Ltd.
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