An optical system includes a first optical element including a refractive surface convex to an enlargement side, a second optical element including a catadioptric surface convex to the enlargement side, a third optical element including a reflective surface of a concave shape with respect to light incident thereon, and a fourth optical element that is a refractive element having positive power, wherein light from the enlargement side travels to a reduction side via the refractive surface, a reflective region of the catadioptric surface, the refractive surface, the reflective surface, the refractive surface, a refractive region of the catadioptric surface, and the fourth optical element in succession, and wherein a medium between the refractive surface and the reflective surface has a refractive index lower than that of the first optical element.


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    Title :

    OPTICAL SYSTEM INCLUDING REFRACTIVE SURFACE AND REFLECTIVE SURFACE, AND IMAGING APPARATUS AND PROJECTION APPARATUS INCLUDING THE SAME


    Contributors:

    Publication date :

    2019-01-31


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B60W CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION , Gemeinsame Steuerung oder Regelung von Fahrzeug-Unteraggregaten verschiedenen Typs oder verschiedener Funktion / G06T Bilddatenverarbeitung oder Bilddatenerzeugung allgemein , IMAGE DATA PROCESSING OR GENERATION, IN GENERAL