| 摘要 |
<p>PURPOSE:To improve diffraction efficiency and enable easy alignment of an illuminant by applying the constitution wherein a hologram exposed to a laser beam irradiated from the illuminant is divided into many small regions and the laser beam radiation to each small hologram region is focused. CONSTITUTION:A vehicle lighting fixture 20 is constituted with a transmission type hologram 10 pasted to, for example, the rear window 1 of a vehicle 2 and an illuminant 4 embedded in a panel at the back of a rear seat in a cabin. Irradiating light 5c from the illuminant 4 is turned into diffracted light 5d with the hologram 10, and made to act as, for example, a high mount stop lamp. In this case, the hologram 10 is divided into many small regions and each of the small holograms 10a to 10i is independently exposed to the light, thereby generating different diffraction characteristics. A hologram region other than exposed to the light is shaded with a mask and a focused beam is irradiated thereto from the illuminant 4 for exposure. According to the aforesaid construction, diffraction efficiency can be improved and easy alignment or the like of the illuminant 4 can be achieved.</p> |
