To provide an optical means used for efficiently condensing light diffusing to surroundings from an LED chip by a reflector and a condensing lens, and condensing it on a desired spot, at desired illuminance, suitable for the size of an object located in a distant location.
The LED chip is arranged by being brought close to a vertex of a lens having one end having directivity in a light-emitting direction and formed in to a nearly conical shape; the distance of an irradiation object and the size of an illumination spot are allowed to be optionally set by changing the vertex of the circular cone; light that is about to diffuse more than a lens diameter is contained by a cylinder arranged adjacent to a light emission side of the lens and having a cavity in its inside, and guided to an object located in a long distance; a reflector is arranged to surround the lens; light that cannot be condensed by the lens is captured, and reflected and refracted in a predetermined direction; and thereby light emission efficiency is improved.
JP2004273353A | 2004-09-30 | |||
JP2005056852A | 2005-03-03 | |||
JP2004152764A | 2004-05-27 | |||
JP2007207507A | 2007-08-16 | |||
JP2006252841A | 2006-09-21 | |||
JP2006244923A | 2006-09-14 | |||
JP2007149451A | 2007-06-14 | |||
JP2006099998A | 2006-04-13 | |||
JP2000162478A | 2000-06-16 | |||
JP2003281909A | 2003-10-03 | |||
JP2008084600A | 2008-04-10 | |||
JP2008059860A | 2008-03-13 | |||
JP2005235744A | 2005-09-02 | |||
JP2005353816A | 2005-12-22 | |||
JP2002043629A | 2002-02-08 | |||
JP2006294526A | 2006-10-26 |
Next Patent: ELECTROLYTIC SOLUTION, AND SECONDARY BATTERY USING THE SAME