LIGHT-BEAM SHAPER

• US 20100118531A1
• Filed: 04/04/2008
• Published: 05/13/2010
• Est. Priority Date: 04/05/2007
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Montagne, Louis
• Granted Patent: US 8,220,958 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: F21S 2/00 Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
• CPC Class Codes: F21S 8/08 with a standard F21S6/00 takes precedence
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21W 2131/103 of streets or roads
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0014 at least one surface having optical power
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: G02B 27/0955 Lenses lenses per se G02B3/00

Abstract

The invention relates to an optical device for imparting an elongate shape to a light beam emitted by a LED, and to street luminaries which comprise such optical devices. The optical device comprises a lens (2) having an entry diopter (3) and an exit diopter (4) which comprises a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections.

Claims

1. An optical device for imparting an elongate shape to a light beam, said optical device comprising a lens (2) having (i) an entry diopter (3, 301, 302) and (ii) an exit diopter (4, 400) which comprises a first convergent section (41, 401), a second convergent section (42, 402) and a divergent section (43, 404) bridging said first and second convergent sections.

2. The optical device of claim 1, wherein said exit diopter (4) comprises a rotationally symmetrical continuous surface.

3. The optical device of claim 1, wherein said convergent sections (41, 401, 42, 402) of the exit diopter (4, 400) are symmetrical with respect to one another.

4. The optical device of claim 1, wherein said convergent sections (41, 401, 42, 402) of the exit diopter (4, 400) comprise quadric surfaces.

5. The optical device of claim 1, wherein said entry diopter (3, 301, 302) comprises a lodging arrangement (31, 301, 302) for a light source.

6. The optical device of claim 5, wherein said lodging has an axis of symmetry (22, 221, 222) which passes through said light source.

7. A luminary head (112), useful in particular for street lighting, comprising a plurality of light emitting diodes (LED) each LED being arranged upstream of an optical device (2) as claimed in claim 1, said optical devices having substantially the same bearing.

8. The luminary head of claim 7, further comprising means for dissipating the heat produced while operating said LEDs.

9. The luminary head of claim 7, wherein each LED is arranged in a lodging (31, 301, 302) provided for on the entry diopter (3) of said optical devices (2).

10. A street luminary (11) comprising a luminary head (112) as claimed in claim 8 and a luminary post (111).