ZOOM LENS FOR PROJECTION, PROJECTOR DEVICE AND IMAGING APPARATUS

PROBLEM TO BE SOLVED: To attain a new zoom lens for projection which enlarges a plane image in a variable magnification state and projects and forms an image. SOLUTION: The zoom lens for projection which enlarges the plane image in the variable magnification state and projects and forms the image is...

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1. Verfasser:	KONO YOSHITSUGU
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
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creator	KONO YOSHITSUGU
description	PROBLEM TO BE SOLVED: To attain a new zoom lens for projection which enlarges a plane image in a variable magnification state and projects and forms an image. SOLUTION: The zoom lens for projection which enlarges the plane image in the variable magnification state and projects and forms the image is constituted by arranging a first lens G1 to a seventh lens group G7 in order from an enlargement side. The first lens group G1 has negative refractive power; the third lens group G3, the fourth lens group G4 and the fifth lens group G5 all have positive refractive power; the sixth lens group G6 has negative refractive power; the seventh lens group G7 has positive refractive power; and the second lens group G2 has negative or positive refractive power. COPYRIGHT: (C)2010,JPO&INPIT
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SOLUTION: The zoom lens for projection which enlarges the plane image in the variable magnification state and projects and forms the image is constituted by arranging a first lens G1 to a seventh lens group G7 in order from an enlargement side. The first lens group G1 has negative refractive power; the third lens group G3, the fourth lens group G4 and the fifth lens group G5 all have positive refractive power; the sixth lens group G6 has negative refractive power; the seventh lens group G7 has positive refractive power; and the second lens group G2 has negative or positive refractive power. 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subjects	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
title	ZOOM LENS FOR PROJECTION, PROJECTOR DEVICE AND IMAGING APPARATUS
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