Projection apparatus

Details Projection apparatus Projection apparatus

2008-07-29

2008-07-29

Hasan, Mohammed (Department: 2873)

Optical: systems and elements

Lens

With lens casing

C359S649000

Reexamination Certificate

active

07405891

ABSTRACT:
A projection apparatus including an optical engine, a ring, a lens and multiple casings is provided. The optical engine is suitable for producing an image light beam to project an image onto a screen. The ring is fixed on the optical engine. The lens is disposed outside the optical engine and located at a transmission path of the image light beam. The casings are assembled to the ring and connected to each other to form a lens barrel for fixing the lens, and the lens is driven to move relative to the optical engine and the ring by the lens barrel. The projection apparatus has a smaller overall dimension.

REFERENCES:
patent: 5218484 (1993-06-01), Terai
patent: 6364491 (2002-04-01), Okada et al.
patent: 6816324 (2004-11-01), Jang

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