Invention Grant
- Patent Title: Illumination system comprising beam shaping element
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Application No.: US13265282Application Date: 2010-04-21
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Publication No.: US09748522B2Publication Date: 2017-08-29
- Inventor: Coen Adrianus Verschuren , Ferry Zijp
- Applicant: Coen Adrianus Verschuren , Ferry Zijp
- Applicant Address: NL Eindhoven
- Assignee: PHILIPS LIGHTING HOLDING B.V.
- Current Assignee: PHILIPS LIGHTING HOLDING B.V.
- Current Assignee Address: NL Eindhoven
- Priority: EP09158685 20090424
- International Application: PCT/IB2010/051749 WO 20100421
- International Announcement: WO2010/122507 WO 20101028
- Main IPC: H01L33/00
- IPC: H01L33/00 ; H01L51/52 ; B82Y20/00 ; B82Y30/00 ; G02F1/1335 ; F21Y105/00 ; F21Y115/15

Abstract:
The invention relates to an illumination system comprising a light emitting device and a beam shaping element for generating an angular distribution of the light emitted from the illumination system. The beam shaping element is configured for recycling at least a part of the light emitted from a light emitting surface of the light emitting device via reflection back towards the light emitting surface. The illumination system further comprises a diffuser arranged substantially parallel to the light emitting surface for diffusing at least part of the recycled light. The diffuser is constituted of a translucent diffuser and/or a diffusely reflective electrode layer of the light emitting device. Limiting the angular distribution by recycling light, using the beam shaping element for recycling light via reflection, reduces glare when the illumination system is used in general lighting applications. The diffuser avoids that the recycled light is confined between the beam shaping element and the light emitting surface of the light emitting element. The recycling is preferably done via total internal reflection at the beam shaping element. The presence of the diffuser improves the efficiency of the illumination system.
Public/Granted literature
- US20120037943A1 ILLUMINATION SYSTEM COMPRISING BEAM SHAPING ELEMENT Public/Granted day:2012-02-16
Information query
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