Illuminating device for projector

Illumination – Light source and modifier – Plural serial lens elements or components

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Details

362309, 362328, 362331, 362335, F21V 1302

Patent

active

059189681

ABSTRACT:
An illuminating device for a projector, includes: a lamp for emitting light; a parabolic mirror for converting the light emitted from the lamp into parallel light rays by reflecting the light emitted from the lamp; a convex lens for refracting the parallel light rays which have been reflected by the parabolic mirror, and also converting directly input light from the lamp which is not reflected by the parabolic mirror into parallel light rays; and a combination lens composed of a first lens and a second lens. The first lens is for focusing the light refracted by the convex lens at a predetermined focal point and the second lens is for focusing the parallel light rays converted by the convex lens at the focal point. An image lens is also provided for converting the light focused at the focal point into a parallel beam of light rays. Therefore, the efficiency of the use of light of a projector can be improved by adopting such an illuminating device.

REFERENCES:
patent: 3325238 (1967-06-01), Geier
patent: 4327972 (1982-05-01), Brunsting
patent: 5307247 (1994-04-01), Cejnek
patent: 5662410 (1997-09-01), Suganuma
patent: 5808759 (1998-09-01), Okamori et al.

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