Photoelectric pinfall detection system
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United States of America Patent
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-
May 11, 1999
Grant Date -
N/A
app pub date -
Apr 17, 1997
filing date -
Jun 26, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bowling alley is provided with a photoelectric pinfall detection system which includes a pinfall detection device by means of which it can be recognized whether or not a fallen pin is lying in the end region of the bowling lane or in one of the gutters. The pinfall detection device comprises a light sensitive sensor array which detects any radiation reflected by a pin lying in the end region of the bowling lane. For this purpose, the lower foot portion of each pin may be provided with a black ring. Thus, the reflection characteristics of the pin change in dependence whether the pin is standing upright or has fallen, because in the first case the weak reflection of the black ring is detected by the pinfall detection apparatus, while in the second case the strong reflection of the white central portion of the pin is detected.
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Cited Art Landscape
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