| 摘要 |
<p>The present invention provides, at a reasonable price, a lighting device for lighting up an object to be illuminated at uniform and high efficiency for light utilization, and a device for displaying images excellent in hue, visual recognition observability, brightness and uniformity. The present invention also provides, at a reasonable price, an excellent image display device or the like using such a lighting device as a light source. Therefore, a diffractive optics is particularly used for condensing a bundle of light from a lamp, deflecting an image light or the like. In particular, scattering anisotropy due to the incident angle and the wavelength, change in the diffraction efficiency, change in the transmission characteristic or the like is utilized. Moreover, an optical element such as Fresnel lens is also used together with the diffractive optics. <IMAGE></p> |
