| 摘要 |
There is provided an illuminating device which includes: a surface light source including a plurality of light emitting diodes disposed two-dimensionally; a light condensing means comprising a plurality of Fresnel lenses which are disposed corresponding to respective light emitting diodes, and each of which converts a light from each light emitting diode into a substantially collimated light; and a light diffusing means disposed at the stage consequent to the light condensing means, and including a plurality of Fresnel lenses which have a smaller diameter and are arranged in a higher density than the Fresnel lenses of the light condensing means. The illuminating device is adapted to emit a highly bright light with excellence in brightness uniformity, and a light source unit incorporating the illuminating device disposed behind a liquid crystal panel is suitably used in an HUD.
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