Optical element and lighting device with an optical element

US10180522B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Bernd Wölfing · Mainz, DE
• Andreas Schneider · Leonberg, DE

Key dates

• Filing date: May 19, 2016
• Grant date: Jan 15, 2019
• Expiry date: Oct 17, 2036

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F21Y2115/10
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

An optical arrangement is provided that includes a first optical element comprising a light guide that has a bevel face and a second optical element. The first optical element conducts light by total internal reflection at a wall and has a light entry area defined by a non-beveled end face and a light exit area formed by a surface area of the wall at that end proximate the bevel face. The second optical element has a light entry aperture arranged on or facing the light exit area. The light entry area has a width x and the light entry aperture has a height z, which meet the following relationship: x/z≤1.5·[tan(90°−α/2)−tan(90°−(2·[α/2+90°]−[180°−arcsin(1/n)]))]−1.Herein, α denotes the deflection angle of the light at the bevel face and n denotes the refractive index of the material of the first optical element.