Zoom unit, a light engine having the zoom unit and an illuminating apparatus

Patent metadata

Field	Value
Publication number	US-9587801-B2
Application number	US-201214233073-A
Country	US
Kind code	B2
Filing date	Jun 1, 2012
Priority date	Jul 15, 2011
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A zoom unit ( 1 ) of a light engine ( 5 ), comprising at least one lens ( 2 ), at least one first reflector ( 3 ) and at least one second reflector ( 4 ), other at least one lens ( 2 ) receives a collimated beam (LI) from a light source unit ( 6 ) of the light engine ( 5 ), the collimated beam (LI) being incident on the first reflector ( 3 ) after being converged by the lens ( 2 ), and being incident on the second reflector ( 4 ) after being reflected by the first reflector ( 3 ), to produce an output beam (L4) with its beam angle changed.

First claim

The invention claimed is:

1. An illuminating apparatus comprising: a light source capable of emitting a collimated beam of light;
a converging lens positioned to directly receive the collimated beam of light emitted from the light source, the converging lens capable of converging light entering the converging lens from the light source, the converging lens being a donut lens that is rotationally symmetric about a central axis;
a first reflector positioned to directly receive, on a reflecting surface thereof, the converging light emitted from the converging lens and shaped so as to change a propagation direction of light striking the first reflector substantially toward the central axis, the first reflector being ring-shaped that is rotationally symmetric about the central axis, the reflecting surface of the first reflector being concave toward the converging lens and being formed as a faceted surface;
a second reflector positioned on the central axis to directly receive, on an outer reflecting surface thereof, the light reflected by the first reflector and shaped so as to change a propagation direction of light striking the second reflector to be directed away from the central axis, the second reflector being positioned offset from a light path between the converging lens and the first reflector, the outer reflecting surface of the second reflector having a conically shaped outer surface with a larger end thereof being closer to the converging lens than a smaller end thereof, and
a third reflector positioned to directly receive, on a reflecting surface thereof, the light reflected by the second reflector and shaped so as to change a propagation direction of light striking the third reflector to converge at a converging area spaced from the third reflector substantially on the central axis.

2. The illuminating apparatus of claim 1 , wherein the light source comprises a plurality of LED sub light source units.

3. The illuminating apparatus of claim 2 , wherein each of the plurality of LED sub light source units comprises an LED and an optical device corresponding to each respective LED, the optical device being configured to modify light emitted from the respective LED substantially into a collimated beam.

4. The illuminating apparatus of claim 3 , wherein the optical device comprises, for each respective LED, a lens positioned to receive light emitted by the respective LED, and a primary reflector positioned to receive light emitted by the lens.

5. The illuminating apparatus of claim 4 , wherein each lens of the optical device has a substantially cylindrical shape.

6. The illuminating apparatus of claim 4 , wherein each lens of the optical device is a total internal reflection lens.

7. The illuminating apparatus of claim 4 , wherein the optical device further comprising a lens board onto which the lenses of the optical device are mounted.

8. The illuminating apparatus of claim 4 , wherein a cross section of each primary reflector is a hexagon, and wherein each primary reflector is formed by six reflecting portions, each portion forming a side of the hexagon.

9. The illuminating apparatus of claim 8 , wherein each lens of the optical device is positioned within a respective primary reflector within the six sides of the hexagon.

10. The illuminating apparatus of claim 9 , wherein each lens of the optical device is positioned at a center of the respective primary reflector.

11. The illuminating apparatus of claim 8 , wherein the primary reflectors are connected to one another to form a honeycomb layout.

12. The illuminating apparatus of claim 11 , wherein the optical device further comprises a primary reflector board onto which the primary reflectors among all the primary reflectors of the optical device are mounted.

13. The illuminating apparatus of claim 12 , wherein the primary reflector is mounted onto the lens board.

14. The illuminating apparatus of claim 13 , comprising six LED sub light source units arranged in an approximately hexagonal shape.

15. The illuminating apparatus of claim 3 , wherein the plurality of LED sub light source are arranged in a honeycomb layout.

16. The illuminating apparatus of claim 3 , wherein a distance between the light source and converging lens is adjustable so as to adjust a location of the converging area.

17. The illuminating apparatus of claim 3 , wherein the LED sub light source units are positioned substantially in a plane perpendicular to the central axis.

Assignees

• Chen Weihuang
• Ma Ai
• Zeng Sixiong
• Zhong Haiqiang
• Osram Gmbh

Inventors

• Chen Weihuang
• Ma Ai
• Zeng Sixiong
• Zhong Haiqiang

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21K9/60

  Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction · CPC title

• F21V9/40

  with provision for controlling spectral properties, e.g. colour, or intensity · CPC title

• F21V14/00

  Controlling the distribution of the light emitted by adjustment of elements (reflectors with provision for adjusting the curvature F21V7/16; light filters or the like with provision for controlling the colour or intensity F21V9/40; screens using adjustable parallel laminae or strips F21V11/04; screens using iris-type diaphragms F21V11/10; screens using movable sheets without apertures F21V11/18; adjustable mountings for lighting devices F21V21/14) · CPC title

• F21V33/0068

  Medical equipment · CPC title