Lens having a fixed focal length and constant overall length for auto focus applications

US11209621B2 · kind B2 · utility

Assignee

• Leica Camera AG · DE

Inventors

• Dietmar Stuible · Wetzlar, DE
• Sigrun Kammans · Herborn, DE
• Stefan Roth · Västerås, SE

Key dates

• Filing date: Sep 18, 2017
• Grant date: Dec 28, 2021
• Expiry date: May 28, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B27/0075
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A lens with a fixed focal length includes five lens-element groups, a first front lens-element group, a second lens-element group, a third lens-element group, a fourth lens-element group, and a fifth back lens-element group is arranged in a stationary manner. Relative to an imaging plane in a lens barrel and both the focusing front group and the focusing back group are movable jointly relative to one another and to the lens-element groups arranged in a stationary manner in order to focus the lens on objects at different object distances.