发明申请
- 专利标题: Led-type vehicular lamp having uniform brightness
- 专利标题(中): 具有均匀亮度的LED型车灯
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申请号: US10244606申请日: 2002-09-17
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公开(公告)号: US20030169600A1公开(公告)日: 2003-09-11
- 发明人: Yasuyuki Amano
- 申请人: KOITO MANUFACTURING CO., LTD.
- 申请人地址: null
- 专利权人: KOITO MANUFACTURING CO., LTD.
- 当前专利权人: KOITO MANUFACTURING CO., LTD.
- 当前专利权人地址: null
- 优先权: JPP.2001-286585 20010920
- 主分类号: F21V021/00
- IPC分类号: F21V021/00
摘要:
A vehicular lamp which radiates light emitted by LED light sources through indirect illumination and which has uniform brightness. Light emitted from the LED light sources is directed upward and formed into parallel beams by Fresnel lenses, and the parallel beams are reflected by a reflector in a frontward direction of the lamp. The reflector is divided into sub reflectors that differ in height and angle of forward inclination according to the areas on which the parallel light beams impinge. The distance between each of the LED light sources and the corresponding one of the Fresnel lenses increases in proportion to a decrease in the height of the corresponding one of the sub reflectors, and the intensity of the luminous flux impinging on each of the Fresnel lenses decreases in proportion to the decrease in the height of the corresponding one of the sub reflectors. Hence, the intensity of the luminous flux impinging on the reflecting surface of each of the sub reflectors decreases in proportion to the decrease in the projected area in the forward direction of the lamp, and thus the sub reflectors have a uniform luminance and the entire reflecting surface of the reflector appears uniform in brightness.
公开/授权文献
- US06805476B2 Led-type vehicular lamp having uniform brightness 公开/授权日:2004-10-19
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