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Zoom lens, and image magnification projection system using it and video projector, and rear projector and multi-vision system using the video projector
Zoom lens, and image magnification projection system using it and video projector, and rear projector and multi-vision system using the video projector
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机译:变焦镜头,使用该镜头和视频投影仪的图像放大投影系统以及使用视频投影仪的后投影仪和多视场系统
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摘要
The present invention provides a zoom lens that suppresses the generation of unnecessary light and is suitable for a projection lens. The zoom lens is used as a projection lens of a projector in which a prism is located between the projection lens and a spatial optical modulating element B. A lens closest to the spatial optical modulating element B is a meniscus positive lens whose convex surface faces a screen. A refractive index of the meniscus positive lens is 1.75 or more.
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