Imaging optical unit for generating a virtual image and smartglasses

US10371950B2 · kind B2 · utility

Assignee

• tooz technologies GmbH · DE

Inventors

• Hans-Juergen Dobschal · Kleinromstedt, DE
• Karsten Lindig · Erfurt, DE

Key dates

• Filing date: Dec 10, 2015
• Grant date: Aug 6, 2019
• Expiry date: Dec 10, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2027/0178
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An imaging optical unit for generating a virtual image of an initial image represented on an image generator includes at least one spectacle lens, an input coupling device for coupling an imaging beam path emanating from the initial image in between the inner surface and the outer surface of the spectacle lens, and a Fresnel structure present in the spectacle lens for coupling the imaging beam path out from the spectacle lens in the direction of the eye. The input coupling device couples the imaging beam path in between the inner surface and the outer surface of the spectacle lens in such a way that it is guided by reflections between the inner surface and the outer surface to the Fresnel structure. The Fresnel structure has Fresnel surfaces, which bring about a base deflection of the rays of the imaging beam path by 45 to 55 degrees.