Projection apparatus, light source module and beam combiner...

Details Projection apparatus, light source module and beam combiner... Projection apparatus, light source module and beam combiner...

2011-03-22

2011-03-22

Sohn, Seung C (Department: 2878)

Optics: image projectors

Composite projected image

Multicolor picture

C353S053000

Reexamination Certificate

active

07909467

ABSTRACT:
A beam combiner for combining a first color beam, a second color beam, and a third color beam is provided. The beam combiner has a transparent substrate with a first optical surface on which a first reflective film reflecting the first color beam is disposed, and a second optical surface on which a second reflective film reflecting the second color beam is disposed. The first optical surface and the second optical surface are parallel. The second color beam entering the transparent substrate is reflected by the second reflective film and leaves the transparent substrate by passing through the first optical surface, while the third color beam enters the transparent substrate from the second optical surface and leaves the transparent substrate by passing through the first optical surface. The optical paths of the first, the second, and the third color beam are substantially coincident after emerging from the first optical surface.

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