| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicular lighting tool capable of enhancing its productivity.SOLUTION: The shape of a front face 19 of a translucent member 15 is formed such that an incidence angle &thetas; of each beam Li from a light emitting part 12 is a predetermined angle not smaller than a critical angle &bgr;. The shape of a rear face 16 of the translucent member (a rotation body type) 15 is set so that, when reflected light Lo from the translucent member front face 19 enters into a rear side peripheral face part 18 at an inclination angle α to the vertical direction, the inclination angle α is α<90°-2&bgr;-γ where &bgr; is the critical angle and γ is the deviation angle of re-reflected light Loo to the horizontal direction. Thus, inner face reflection from the front face 19 and the rear face 16 of the translucent member can be performed by using total reflection without the need for a vapor deposition treatment film, thereby eliminating a site to which vapor deposition is applied for the inner face reflection. |
