Patent ID: 6827467
Filing Date: 2004-12-07
Classification: F21V,G02B,G03B

Abstract:
An illuminating apparatus comprising:a light source; a first optical unit disposed on the object side of the light source; the first 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 emerges, wherein a beam emerging from the lens portion and a beam emerging from the emergence surface are condensed substantially at one point on the optical axis of the first optical unit; and a second optical unit disposed on the object side of the first optical unit, the second optical unit including a second lens portion having positive refractive power in the central portion thereof, and a plurality of prism portions having their convexity facing the object side on both sides of the second lens portion.