Illumination device

• US 8,246,200 B2
• Filed: 07/21/2010
• Issued: 08/21/2012
• Est. Priority Date: 09/09/2009
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Foxsemicon Integrated Technology Incorporated
• Inventors: Lai, Chih-Ming, Chen, Tien-Pao, Peng, Chiao-Ling
• Primary Examiner(s): Tan, Vibol
• Application Number:
  US12/840,301
• Publication Number:
  US 20110057579A1
• Time in Patent Office: 762 Days
• Field of Search: 362326-341, 362/606, 362/607, 362/311.01, 362/311.02, 362/311.06, 362/311.09, 362/247, 315/192, 315/294
• US Class Current: 362/235
• CPC Class Codes: F21V 23/0442 activated by means of a sensor, e.g. motion or photodetectors
• CPC Class Codes: F21V 5/007 Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane combination of two or more refractors F21V5/008
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21V 5/08 producing an asymmetric light distribution
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H05B 45/12 using optical feedback

Abstract

An illumination device includes a light source module consisting of a substrate and a plurality of light emitting elements on the substrate in an array and an optical module array consisting of a plurality of optical modules covering the light emitting elements. Each optical module includes a first optical component and a second optical component. A first illumination distribution pattern is generated by light from the light emitting elements and modulated by the first optical components. A second illumination distribution pattern is generated by light from the light emitting elements and modulated by the second optical components. An illumination distribution pattern of the illumination device is superposition of the first illumination distribution pattern and the second illumination distribution pattern.

Claims

1. An illumination device comprising:

a light source module comprising a substrate and a plurality of light emitting elements; and

an optical module array mounted on the substrate, the light emitting elements electrically connected to the substrate and mounted thereon in array, the optical module array comprising a plurality of optical modules, each comprising a first optical component covering a corresponding light emitting element and a second optical component covering another corresponding light emitting element, a first illumination distribution pattern generated by light from the light emitting elements and modulated by the first optical components of the optical modules, a second illumination distribution pattern generated by light from the light emitting elements and modulated by the second optical components of the optical modules, an illumination distribution pattern of the illumination device being a superposition of the first illumination distribution pattern and the second illumination distribution pattern.

2. The illumination as claimed in claim 1, wherein the first optical component is a first lens and the second optical component is a second lens, the first lens comprising a first surface and a second surface, the first surface of the first lens being a light incident surface, the second lens comprising a first surface and a second surface, the first surface of the second lens being a light incident surface, the second surface of the first lens and the second surface of the second lens arranged symmetrically, the second surfaces being light emitting surfaces of the first and second lenses.

3. The illumination device as claimed in claim 1 further comprising a detector, the detector configured for detecting an intensity of environmental illumination.

4. The illumination device as claimed in claim 3 further comprising a driving module, the driving module receiving a signal from the detector, the driving module comprising a first driving circuit and a second driving circuit, the first driving circuit and the second circuit respectively controlling the current through the light emitting elements corresponding to the first optical components and the light emitting elements corresponding to the second optical components.

5. The illumination device as claimed in claim 1, wherein the first optical component is a first reflective plate and the second optical component is a second reflective plate, an inner surface of the first reflective plate and an inner surface of the second reflective plate configured for reflecting the light from the light emitting elements, the first reflective plate and the second reflective plate arranged symmetrically.

6. The illumination device as claimed in claim 5, wherein respective cross sections of the first optical components and the second optical components are partial circles.

7. The illumination device as claimed in claim 5, wherein respective cross sections of the first optical component and the second optical component are partially foursquare.

8. The illumination device as claimed in claim 1, wherein the first optical component is a first lens and the second optical component is a second lens, the first lens comprising a first surface and a second surface, the first surface of the first lens being a light incident surface, a plurality of saw-toothed protrusions defined on the second surface of the first lens, the second lens comprising a first surface and a second surface, the first surface of the second lens being a light incident surface, a plurality of saw-toothed protrusions defined on the second surface of the second lens, the saw-toothed protrusions of the first lens and the saw-toothed protrusions of the second lens arranged symmetrically, the second surfaces being light emitting surfaces of the first and second lenses.

9. The illumination device as claimed in claim 2, wherein each of the optical modules further comprises a third optical component, the third optical component being a third lens located between the first and second lens, the third lens comprising a first surface and a second surface, the first surface of the third lens being a light incident surface, the second surface of the third lens being convex and a light emitting surface.

10. The illumination device as claimed in claim 4 further comprising a processor, the processor configured for storing a plurality of working modes and receiving an intensity signal of environmental illumination from the detector, the processor selecting a selected working mode and providing the selected working mode to the driving module, the first driving circuit and the second driving circuit of the driving module controlling currents through the light emitting elements according to the selected working mode.

11. The illumination device as claimed in claim 10, wherein the processor comprises a storage module, a comparator and a selector, the storage module configured for storing a plurality of predetermined intensity values of environmental illumination, the selector comprising a plurality of working modes, the comparator comparing the predetermined intensity values in the storage module and the intensity signal from the detector, the comparator providing a comparison signal to the selector, a selected working mode selected by the selector according to the comparison signal, the selector providing a working mode signal corresponding to the selected working mode to the driving module, the driving module controlling the currents through the light emitting elements according to the working mode signal from the selector.