Title:
車両用灯具の反射鏡の反射面決定方法
Document Type and Number:
Japanese Patent JP4031600
Kind Code:
B2
Abstract:
A reflective surface 10a of a reflector 1 in a vehicle lamp is formed in such a way that a free-formed surface 20 is created as a basic shape so as to satisfy light uniformity out of functional conditions and thin shape as a shape condition and that a reflective surface element 14 created so as to satisfy light diffusibility out of the functional conditions and transparency as an appearance condition is assigned to each of segments obtained by dividing the free-formed surface 20 into an array pattern. Particularly, the free-formed surface 20 or the reflective surface 10a is created so that luminous exitances M specified in a direction along the optical axis satisfy the condition of Mmax/Mmin<=6, whereby the above conditions can be suitably substantiated. Thus, the vehicle lamp improved in functional conditions of light uniformity and light diffusibility while being provided with transparent appearance and thin shape, and the method of determining the reflective surface of the reflector thereof can be realized.
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Inventors:
Natsume Kazunori
Application Number:
JP28168199A
Publication Date:
January 09, 2008
Filing Date:
October 01, 1999
Export Citation:
Assignee:
Koito Manufacturing Co., Ltd.
International Classes:
F21S8/10; G02B5/08; B60Q1/00; F21V7/00; F21V7/04; F21V7/09; F21W107/10; F21Y101/00
Domestic Patent References:
| JP9298002A | ||||
| JP7025508U |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Tatsuya Shioda
Shiro Terasaki
Ichira Kondo
Tatsuya Shioda
Shiro Terasaki
Ichira Kondo