PROJECTION LENS SYSTEM AND IMAGE PROJECTION DEVICE

This projection lens system which projects an image of the reduction side to the magnification side is provided with: a diaphragm; a plurality of positive lenses; and a plurality of negative lenses. Afirst positive lens that is closest to the diaphragm and is on the magnification side further than t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	YAMADA KATSU, IMAOKA TAKUYA, ONISHI HIDEO, IKEO KENJI
Format:	Patent
Sprache:	chi ; 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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Beschreibung
Zusammenfassung:	This projection lens system which projects an image of the reduction side to the magnification side is provided with: a diaphragm; a plurality of positive lenses; and a plurality of negative lenses. Afirst positive lens that is closest to the diaphragm and is on the magnification side further than the diaphragm, a second positive lens that is next closest to the diaphragm after the first positivelens and is on the magnification side, a third positive lens that is closest to the diaphragm and is on the reduction side further than the diaphragm, a first negative lens that is closest to the diaphragm and is on the magnification side further than the diaphragm, and a second negative lens that is closest to the diaphragm and is on the reduction side further than the diaphragm, each have transmittance larger than a lower limit value. The first negative lens has a linear expansion coefficient of alpha n1