Illumination unit and projector including the same

Details Illumination unit and projector including the same Illumination unit and projector including the same

2006-05-30

2006-05-30

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Unitary plural refracting surfaces

C353S097000, C353S098000, C353S102000, C362S257000, C359S642000

Reexamination Certificate

active

07052139

ABSTRACT:
An illumination unit of the present invention includes: an ellipsoidal reflector having a first focus and a second focus; an arc tube; a collimating lens; a first lens array120having a plurality of small lenses122for splitting the illumination luminous flux from the collimating lens into a plurality of partial luminous fluxes; a second lens array having a plurality of small lenses corresponding to the plurality of the small lenses122of the first lens array120;and a superimposing lens for superimposing respective partial luminous fluxes from the second lens array at the illuminated area, characterized in that the light incident surface of the first lens array120is situated at the position which is closer to the ellipsoidal reflector than the second focus, and which is such that the light quantity of the illumination luminous flux from the collimating lens is distributed throughout over the light incident surface.This enables the achievement of the simplification of manufacturing processing and the reduction of the manufacturing cost of the first lens array without reducing the inplane light intensity distribution characteristics on the image formation area of the electrooptic modulation unit which is the illuminated area.

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