| 摘要 |
PROBLEM TO BE SOLVED: To provide a headlight tester equipped with a new measuring means of the irradiation direction and the road surface irradiation point luminous intensity of a passing light. SOLUTION: In this headlight tester A, the lamp R center of a vehicle to be measured and the center axis 4a of a condensing lens 4 of a light receiving part 3 are confronted each other, and the irradiation direction or the luminous intensity of the lamp R is measured. The light receiving part 3 is equipped with a half mirror 10 for transmitting and diffracting a light flux condensed by the condensing lens 4; a road surface irradiation point luminous intensity measuring means 8 for the passing light having a detection element W2 for receiving one light flux via the half mirror 10 and detecting the road surface irradiation point luminous intensity of the passing light on a position regarded as a forward prescribed distance spot of the lamp R; and a screen 6 where a luminous intensity distribution pattern on the position regarded as the forward prescribed distance spot of the lamp R by the other light flux via the half mirror 10 is projected, having standard lines V, H for measuring the irradiation direction of the passing light by collimating with the luminous intensity distribution pattern of the passing light by the lamp and an assist line H3 for assisting a collimation operation. COPYRIGHT: (C)2006,JPO&NCIPI
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