Lighting device with a plurality of light guiding elements with increasing cross-sectional area to reduce divergency

US12092851B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventor

• Bernd Wölfing · Mainz, DE

Key dates

• Filing date: Feb 22, 2022
• Grant date: Sep 17, 2024
• Expiry date: Feb 22, 2042

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F21W2107/30
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A lighting device is provided that includes a light source and an optical element. The light source emits primary light having a primary emission characteristic. The optical element has a light entry face and a light exit face. The optical element includes light guiding elements each forming part of the light entry and exit faces. The light entry faces inject the primary light into the optical element. The light guiding elements each have a boundary surface that totally internally reflects the primary light so that the light exit face emits a secondary light. The optical element reduces a divergence of the primary light such that the secondary light has a secondary emission characteristic with an emission angle (β) that is smaller than an emission angle (α) of the primary emission characteristic. The light exit face is larger than the light entry face.