Focusing device with diopter adjustment

US7330310B2 · kind B2 · utility

Assignee

• Leica Camera AG · DE

Inventors

• Alfred Hengst · Wetzlar, DE
• Rolf Speier · Wismar, DE

Key dates

• Filing date: May 18, 2005
• Grant date: Feb 12, 2008
• Expiry date: Sep 14, 2025

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B7/04
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method for focusing and diopter adjustment in a binocular telescope, in which, for the purpose of diopter adjustment, optical focusing elements (12) in the two telescope tubes (2, 3) can be displaced relative to one another, is distinguished by the fact that, as a result of rotation of a focus drive knob (5), both focusing elements (12) are displaced simultaneously by equal distances via a focus drive, the displacement of at least one of the focusing elements (12) can be locked (13, 14), and, as a result of rotation of the focus drive knob (5), while overcoming a frictional force in the focus drive to the locked focusing element (12), only the unlocked focusing element (12) is displaced.