Fisheye Zoomlinsensystem

Details

Veröffentlichungs-Nr.

EP2407809

Aktenzeichen

EP11172786

Anmeldetag

6. Juli 2011

Veröffentlichung

25. September 2019

Erteilung

25. September 2019

Rechtsraum

EP

IPC

G02B13/06G02B15/177

Abstract

An optical system (1) includes, in order from an object side, a first lens unit (L1) having a negative refractive power and a second lens unit (L2) having a positive refractive power. The optical system satisfies: 1.70‰¤Yt/Yw‰¤2.5, Y=2×f×sin(¸/2) (85°‰¤¸‰¤90°), and 3.45‰¤bfw/|f1|‰¤7, where fw is the shortest focal length, ft is the longest focal length, f is an arbitrary focal length that satisfies fw‰¤f‰¤ft, ¸ is an angle between an optical axis (O) and a principal ray (P) of an off-axis light flux incident upon a lens surface closest to the object, Y is a formed image height of a ray incident at the angle ¸, Yw is the largest image height at the shortest focal length, Yt is the largest image height at the longest focal length, f1 is a focal length of the first lens unit, and bfw is a back focus at the shortest focal length.

Anmelder

Firma

Canon Kabushiki Kaisha

Land

🇯🇵 Japan

Fachgebiete