Rain sensor
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United States of America Patent
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Issued Date -
Mar 4, 2010
app pub date -
Aug 26, 2009
filing date -
Aug 28, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To improve detection performance without requiring precise positioning of a light-emitting element and a lens, a rain sensor 10 having a light-emitting element 13 for emitting light to a windshield glass G; a light-receiving element 14 for receiving the light reflected from the windshield glass G; and a convex lens 18 provided between the light-emitting element 13 and the windshield glass G, for collimating the light emitted from the light-emitting element 13 into parallel light, in which a collection prism 20 is interposed between the light-emitting element 13 and the convex lens 18 so as to provide, at a focal position for the convex lens 18, a light-exiting surface for the light from the light-emitting element 13 having entered the collection prism 20, in order to collect rays of diffused light emitted from the light-emitting element 13 and then emit the collected rays of the light to the convex lens 18 from the focal position for the convex lens 18.
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