| 摘要 |
PROBLEM TO BE SOLVED: To significantly enhance a quantity of light in the peripheral edge portion of a light emission face by constituting the center portion of a Fresnel lens, and constituting the peripheral edge portion of a transmission type hologram. SOLUTION: In the inner lens 5 of a vehicle signal lighting fixture 1, as taking an intersection point P where the optical center line 2 of the vehicle signal lighting fixture 1 intersects the inner lens 5 as reference, the center portion is composed of a Fresnel lens 5F, and the peripheral edge portion is composed of a hologram portion 5H by a penetration type hologram. A thin film-like smooth transmission type hologram is arranged in the peripheral edge portion of the inner lens 5 in which the deflection angleαof incident light from a light source becomes large. Thereby, no occurrence of the shading of the incident light by an inside cut as generated in the case of a conventional reflection type Fresnel cut is allowed so that a quantity of light in the peripheral edge of a light emission face is significantly enhanced. |
