Projection lens

A projection lens for projecting an image onto a projection plane includes: a lens substrate; and an antireflective film disposed on a surface of the lens substrate. The antireflective film includes, in order starting from an air side of the antireflective film, a first layer, second layer, third la...

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Bibliographische Detailangaben
Hauptverfasser:	Nakano, Yoshihiro, Teramoto, Miyuki, Takahara, Koji
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 CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY CINEMATOGRAPHY ELECTROGRAPHY GLASS HOLOGRAPHY JOINING GLASS TO GLASS OR OTHER MATERIALS METALLURGY MINERAL OR SLAG WOOL OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS
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Beschreibung
Zusammenfassung:	A projection lens for projecting an image onto a projection plane includes: a lens substrate; and an antireflective film disposed on a surface of the lens substrate. The antireflective film includes, in order starting from an air side of the antireflective film, a first layer, second layer, third layer, fourth layer, fifth layer, sixth layer, seventh layer, and eighth layer. The first layer is formed of MgF2. Each of the second layer, the fourth layer, the sixth layer, and the eighth layer has a refractive index of 2.0 to 2.3. Each of the third layer, the fifth layer, and the seventh layer is formed of SiO2.