| 摘要 |
This specification discloses an illuminating apparatus having a light source, an optical unit disposed on the object side of the light source, the optical unit being provided with a lens portion having positive refractive power in the central portion thereof, incidence surfaces on which light from the light source is incident and reflecting surfaces for totally reflecting the light incident on the incidence surfaces, on both sides of the lens portion, and an emergence surface from which the light reflected by the reflecting surfaces emerge, wherein a beam emerging from the lens portion and a beam emerging from the emergence surface intersect with each other substantially at the same place in their condensed state, and a second optical unit disposed forwardly of the optical unit and having a plurality of prism portions, wherein the relative interval between the optical unit and the second optical unit are changed to thereby vary an irradiation angle.
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