Light projection device for a photoelectric smoke sensor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 7, 2001
Grant Date -
N/A
app pub date -
Feb 28, 2000
filing date -
May 29, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A light emitting diode 1 and a condenser lens 2 are arranged in an optical axis direction. In the light emitting diode 1, a cover 4 having a tip end lens 5 is attached to one side of a main unit base 9, a light emitting chip 6 is supported by a bonding wire 8 drawn out from the body base 9 inside the cover 4, and a reflector 7 is placed behind the light emitting chip 6. With respect to a first light source of the light emitting chip 6, the position where light which is forward reflected by the reflector 7 impinges on the tip end lens 5 is set as a virtual second light source 10, and the focal point of the condenser lens 2 is set at the position of or in the vicinity of the position of the second light source 10.
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