Lens used for LED light source
Title：
Lens used for LED light source
Application Number：
 200710118965
Application Date：
 2007/06/15
Announcement Date：
 2007/11/07
Pub. Date：
Publication Number：
 101067663
Announcement Number：
Grant Date：
Granted Pub. Date：
ApplicationType：
 Invention
State/Country：
 11[China|beijing]
IPC：
 G02B 3/00G02B 27/00H01L 33/00
Applicant(s)：
 Tsinghua Univ.
Inventor(s)：
 Luo Yi, Zhao Xiaoying, Han Yanjun, Qian Keyuan
Key Words：
 Lens, LED, light source
Abstract：
 The invention relates to a lens used in LED light source. It includes one upper surface, four side faces, and one under surface. The upper one is light emergent face. The under one is LED light source incidence face. The four side faces is formed by two pairs of symmetroids which can make the incident light occur total internal reflection and the angle theta c between the emergence light projection on the cross section and the upper surface normal direction. The incident light on the side face can be reflected to refract out of the lens. Thus the light radiated from the LED light source can form an illumination range with rectangle, square, or strip on far field though the lens.
Claim：
Priority：
PCT：
LegalStatus：

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2008-4-17
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