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).
OPTICAL SYSTEM, IMAGING DEVICE PROVIDED WITH SAME, AND PROJECTION DEVICE
OPTISCHES SYSTEM, BILDGEBUNGSVORRICHTUNG DAMIT UND PROJEKTIONSVORRICHTUNG
SYSTÈME OPTIQUE, DISPOSITIF D'IMAGERIE POURVU DE CELUI-CI, ET DISPOSITIF DE PROJECTION
2020-09-02
Patent
Elektronische Ressource
Englisch
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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