Optisches Abbildungssystem

Details

Veröffentlichungs-Nr.

EP3220179

Aktenzeichen

EP17160302

Anmeldetag

10. März 2017

Veröffentlichung

4. März 2020

Erteilung

4. März 2020

Rechtsraum

EP

IPC

G02B13/00G02B13/18G02B9/60G02B9/62G02B9/64

Abstract

An imaging optical system includes a positive or negative first lens group including a negative lens element closest to the object, a diaphragm, and a positive second lens group. The negative lens element closest to the object has an object-side aspherical surface including a paraxial convex surface, a paraxial curvature that is the greatest within the effective aperture, and a portion within the effective aperture having a curvature less than 1/2 of the paraxial curvature. These conditions are satisfied: R 1 / f < 1.35 D 1 / f > 0.4 ˆ’ 2.5 < f 1 / f < ˆ’ 1.3 V > 56 "f" designates the overall focal length; f1, R1 and D1 respectively designate the focal length, paraxial radius of curvature of an object-side surface, and thickness, of the negative lens element closest to the object; and V designates the Abbe number regarding the d-line of a lens element, within the second lens group, closest to the diaphragm.

Anmelder

Firma

HOYA CORPORATION

Land

🇯🇵 Japan

Fachgebiete