| 摘要 |
PROBLEM TO BE SOLVED: To provide a photometric method for a light source bulb capable of contributing improvement of the accuracy of optical simulation of a vehicle lighting fixture by a simple technique. SOLUTION: A light source bulb 2 having a specular surface formed by covering a surface of a base on a glass bulb side with a reflection member is disposed on a rotation support base 1 and lit, and a light receiver 3 is disposed to be movable around the light source bulb 2. The rotation support base 1 is rotated at a predetermined angle pitch every time when the light receiver 3 is moved with respect to a center axis Xc of the light source bulb 2 at the predetermined angle pitch. The brightness is measured after every movement. Since the obtained brightness data include that of direct light from the light source bulb and that of reflection light from the specular surface, brightness data of the reflection light is regarded as that of direct light from the light source bulb to the specular surface, and three-dimensional brightness distribution data of the direct light from the light source bulb is determined. COPYRIGHT: (C)2010,JPO&INPIT
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