RETICLE HAVING FRESNEL LENS SURFACE

PURPOSE:To omit the replacement of a reticle by providing alternately surfaces having at least two different kinds of angles on a Fresnel lens surface. CONSTITUTION:Lens surfaces FR1 having a radius R1 of curvature set up so that the focus is positioned on a point P1 and lens surfaces FR2 having a r...

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Bibliographische Detailangaben
Hauptverfasser:	SEKIDA MINORU, KOBORI TOSHIO, KIMURA KAZUO
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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Beschreibung
Zusammenfassung:	PURPOSE:To omit the replacement of a reticle by providing alternately surfaces having at least two different kinds of angles on a Fresnel lens surface. CONSTITUTION:Lens surfaces FR1 having a radius R1 of curvature set up so that the focus is positioned on a point P1 and lens surfaces FR2 having a radius R2 of curvature set up so that the focus is positioned on a point P2 are alternately formed on the Fresnel lens surface FLS and these surfaces act as a lens surface having two radiuses R1, R2 of curvature by reducing pitches P. Even if lenses are replaced over a wide range, a visual field can be observed only by one reticle without replacing the reticle FL in accordance with the replacement of lenses or zooming.