An optical system 10 includes, in order from an enlargement side, a front group 1, an aperture diaphragm 3, and a rear group 2, the front group 1 including a refractive surface 11a convex toward the enlargement side, the rear group 2 including a concave reflective surface 12b, and Conditional Expressions of 0.7 ¤ |R1| / Ll ¤ 1.5 and 2 ¤ |Rm| / Lm ¤ 7 are satisfied, where a curvature radius of the refractive surface 11a is Rl (mm), a distance between the refractive surface 11a and the aperture diaphragm 3 is Ll (mm), a curvature radius of the reflective surface 12b is Rm (mm), and a distance between the aperture diaphragm 3 and the reflective surface 12b is Lm (mm).


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    Title :

    OPTICAL SYSTEM, IMAGING DEVICE PROVIDED WITH SAME, AND PROJECTION DEVICE


    Additional title:

    OPTISCHES SYSTEM, BILDGEBUNGSVORRICHTUNG DAMIT UND PROJEKTIONSVORRICHTUNG
    SYSTÈME OPTIQUE, DISPOSITIF D'IMAGERIE POURVU DE CELUI-CI, ET DISPOSITIF DE PROJECTION


    Contributors:

    Publication date :

    2020-09-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / B60T Bremsanlagen für Fahrzeuge oder Teile davon , VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF / B62D MOTOR VEHICLES , Motorfahrzeuge / H04N PICTORIAL COMMUNICATION, e.g. TELEVISION , Bildübertragung, z.B. Fernsehen



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