| 摘要 |
A projection apparatus comprising a light valve disposed in a housing having an opening is provided. The opening is sealed by a transparent plate to separate inside and outside of the housing. A lens and a light source providing a light beam are disposed outside of housing. The light beam is guided by the lens and passes through the transparent plate to the light valve, thus a modulated light is formed on the light valve. The projection lens is used to guide the modulated light to project an image on a screen. A focus of the projection lens is adjustable to make the image on the screen clear and precise.
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