LENS FOR PROJECTION AND PROJECTOR DEVICE

PROBLEM TO BE SOLVED: To successfully realize various attributes with a lens for projection of less lens construction as six lenses. SOLUTION: The lens for projection expands a plane image to project and form an image, has the first lens L1 having negative refracting power, the second meniscus-shape...

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Bibliographische Detailangaben
1. Verfasser: KONO YOSHITSUGU
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To successfully realize various attributes with a lens for projection of less lens construction as six lenses. SOLUTION: The lens for projection expands a plane image to project and form an image, has the first lens L1 having negative refracting power, the second meniscus-shaped lens L2 whose concave surface is directed toward the expansion side, the third lens L3 having positive refracting power, the fourth lens L4 having negative refracting power, the fifth lens L5 having positive refracting power and the sixth lens L6 having positive refracting power in order from the expansion side and in the lens, focal distance of the first lens L1: f1 and focal distance of the third lens L3: f3 satisfy a condition: (1) 1