Zoomobjektiv und Informationsvorrichtung damit

Details

Veröffentlichungs-Nr.

EP2555035

Aktenzeichen

EP12178711

Anmeldetag

31. Juli 2012

Veröffentlichung

27. März 2013

Rechtsraum

EP

IPC

G02B15/17

Abstract

A zoom lens includes first to fifth lens groups having positive, negative, negative, positive, and positive refractive power, respectively. The third lens group includes a single negative meniscus lens with a concave surface on an object side, to move along the optical axis for focusing. When zooming from a wide angle end to a telephoto end, an interval between the first and second lens groups increases, an interval between the second and third lens groups increases, an interval between the third and fourth lens groups decreases, and an interval between the fourth and fifth lens groups decreases. The fourth and fifth lens groups are set to have a combined lateral magnification ²45T to satisfy the following condition, when an object distance is infinite at a telephoto end: - 0.041 < ² �¢ 45 �¢ T / Ft < - 0.25 where Ft is a focal length of the entire zoom lens at the telephoto end.

Anmelder

Firmen

Ricoh Company, Ltd.
Ricoh Company Ltd.

Land

🇯🇵 Japan

Fachgebiete