Photoelectric scanner with light-reflector or light barrier
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United States of America Patent
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-
Feb 23, 1988
Grant Date -
N/A
app pub date -
Mar 26, 1986
filing date -
Mar 29, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A photo-electric scanning device 1, with tubular housings 2, 3 with light source 15 and receiving element 16 and 17, respectively, arranged transversely and enclosing a web between them. The receiving element 17 cooperates with the light source 15 either according to the reflection principle or the light barrier principle. For light source 15 two receiving elements 16, 17 are provided which are capable of being actuated, of which either the first 16 cooperates with the light source 15 according to the reflection principle or the second 17 according to the light barrier principle. The first receiver 16 is closer to the light source 15 than the second receiving element 17. In this manner, operation is continuous with both receiving elements 16, 17.
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