Light-emitting diode light source

• US 8,764,231 B2
• Filed: 03/02/2012
• Issued: 07/01/2014
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Chung, Hsiang-Chi, Chen, Ji-Feng, Hu, Hung-Lieh, Chen, Chen-Kun
• Primary Examiner(s): Patel, Vip
• Application Number:
  US13/410,312
• Publication Number:
  US 20130114256A1
• Time in Patent Office: 851 Days
• Field of Search: 362/244, 362/612, 362/615, 362/545, 362/228
• US Class Current: 362/244
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 11/14 with many small apertures
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/20 on convex supports or substrates, e.g. on the outer surface of spheres
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED light source includes a carrier, a plurality of LED chips and at least one set of lenses. The carrier has a mounting surface and the LED chips are mounted on the mounting surface. The set of lenses disposed on the carrier includes a first lens and a second lens, and the first lens encapsulates one of the LED chips and a lighting pattern provided from the LED chip encapsulated by the first lens is converted into a first lighting pattern. The second lens encapsulates one of the LED chips and a lighting pattern provided from the LED chip encapsulated by the second lens is converted into a second lighting pattern. The second lighting pattern is different from or compensates the first lighting pattern.

Claims

1. A light-emitting diode (LED) light source, comprising:

a carrier having a mounting surface;

a plurality of LED chips, disposed on the mounting surface;

at least one set of lenses disposed on the carrier, the set of lenses comprising;

a first lens encapsulating one of the LED chips, wherein a lighting pattern provided from the LED chip encapsulated by the first lens is converted into a first lighting pattern; and

a second lens encapsulating one of the LED chips, wherein a lighting pattern provided from the LED chip encapsulated by the second lens is converted into a second lighting pattern.

2. The LED light source of claim 1, wherein the carrier comprises a ring-shaped carrier.

3. The LED light source of claim 1, wherein the first lighting pattern and the second lighting pattern compensate each other.

4. The LED light source of claim 1, wherein an illumination coverage of the first lighting pattern is greater than 90°

, an illumination coverage of the second lighting pattern is greater than 90°

, and a combination of the first lens and the second lens provides a mixed lighting pattern whose illumination coverage is greater than 180°

.

5. The LED light source of claim 1 further comprising a third lens, wherein the third lens encapsulates one of the LED chips, the lighting pattern provided from the LED chip encapsulated by the third lens is converted into a third lighting pattern, the third lighting pattern is different from the second lighting pattern, and the third lighting pattern is different from the first lighting pattern.

6. The LED light source of claim 5, wherein the first lighting pattern, the second lighting pattern and the third lighting pattern compensate each other.

7. The LED light source of claim 5, wherein an illumination coverage of the first lighting pattern is greater than 90°

, an illumination coverage of the second lighting pattern is greater than 90°

, an illumination coverage of the third lighting pattern is greater than 90°

, and a combination of the first lens, the second lens and the third lens provides a mixed lighting pattern whose illumination coverage is greater than 270°

.

8. The LED light source of claim 1, wherein a quantity of the set of lenses is greater than one, the plurality of sets of lenses are arranged on the carrier along a ring-shaped path, and the plurality of sets of lenses are installed at a same side of the carrier.

9. The LED light source of claim 1 further comprising:

a heat dissipation lamp holder; and

a driving circuit, electrically connected to the LED chips, wherein the carrier and the driving circuit are disposed on the heat dissipation lamp holder.

10. The LED light source of claim 9 further comprising a lamp shade disposed on the heat dissipation lamp holder, wherein the lamp shade covers the carrier, the LED chips and the set of lenses.

11. The LED light source of claim 9, wherein the heat dissipation lamp holder comprises a protruding portion, and the carrier is disposed on the protruding portion.

12. The LED light source of claim 11, wherein an outer dimension of the protruding portion is smaller than that of the carrier.

13. The LED light source of claim 12, wherein a radius of the heat dissipation lamp holder is L, a radius of the carrier is r, and L, r satisfy the following relationship:

L<

r+h/tan [(180−

θ

)/2]

where θ

is an illumination range of the LED light source, and h is a height of the protruding portion.