Light source and vehicle lamp

• US 8,506,147 B2
• Filed: 01/11/2010
• Issued: 08/13/2013
• Est. Priority Date: 08/20/2003
• Status: Expired due to Fees

• Current Assignee: Stanley Electric Company Limited
• Original Assignee: Stanley Electric Company Limited
• Inventors: Yatsuda, Yasushi, Koike, Teruo, Kushimoto, Takuya
• Primary Examiner(s): Ton, Anabel
• Application Number:
  US12/685,525
• Publication Number:
  US 20100315828A1
• Time in Patent Office: 1,310 Days
• Field of Search: 362/249.02, 362/249.1, 362/545, 362/543, 362/544, 362/548
• US Class Current: 362/545
• CPC Class Codes: F21S 41/143 the main emission direction of the LED being parallel to the optical axis of the illuminating device
• CPC Class Codes: F21S 41/151 arranged in one or more lines
• CPC Class Codes: F21S 41/18 Combination of light sources of different types or shapes
• CPC Class Codes: F21S 41/43 characterised by the shape thereof
• CPC Class Codes: F21S 41/663 by switching light sources by switching incandescent light sources F21S41/162
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate

Abstract

A light source apparatus for vehicle lamps and particularly vehicle headlights can include a plurality of LED elements can be mounted in a cavity located on a base surface or on a base. Each of the LED elements can be arranged in such a manner as to form an emission shape and a brightness distribution that is suited for a light distribution pattern, and especially a light distribution pattern for a vehicle headlight.

Claims

1. A light source comprising:

a base;

a first plurality of LED elements located adjacent the base;

a second plurality of LED elements located adjacent the base, each of the second plurality of LED elements dimensioned smaller than each of the first plurality of LED elements; and

wherein the first plurality of LED elements are arranged in a stepped fashion with respect to an optical axis of the light source and the second plurality of LED elements are arranged in an L-shaped pattern.

8. The light source according to claim 1, further comprising a flat lens located above each of the first plurality of LED elements and the second plurality of LED elements, the lens being positioned between the first plurality of LED elements and the light shielding device, and the lens also being positioned between the second plurality of LED elements and the light shielding device.

2. The light source according to claiml, further comprising a light shielding device adjacent the base and including a first edge and a second edge non-parallel to the first edge and abutting the first edge at a junction.

3. The light source according to claim 2, wherein the second plurality of LED elements are located closer to the junction than the first plurality of LED elements.

4. The light source according to claim 2, wherein the second plurality of LED elements include:

a corner LED unobstructed by the light shielding device as viewed from the optical axis of the light source;

a second LED adjacent one side of the corner LED unobstructed by the light shielding device as viewed from the optical axis of the light source; and

a third LED adjacent another side of the corner LED and partially obstructed by the light shielding device as viewed from the optical axis of the light source.

5. The light source according to claim 4, wherein the first plurality of LED elements includes a central LED element and a pair of LED elements flanking the central LED element, and the central LED element is aligned with the junction.

6. The light source according to claim 5, wherein the second plurality of LED elements are positioned adjacent the central LED element and are flanked by the pair of LED elements.

7. The light source according to claim 6, wherein the pair of LED elements each includes a top edge extending parallel with the first edge, wherein the top edge of each of the pair of LED elements is collinear with each other.

9. The light source according to claim 2, wherein the second edge abuts the first edge with an angle formed between an extension of the first edge from the junction and the second edge being between approximately 15 and 45 degrees.

10. A light source comprising:

a base having an upper end and a lower end as viewed along an optical axis of the light source;

a primary LED element disposed closer to the upper end than to the lower end, and

a plurality of secondary LED elements, each of the secondary LED elements disposed closer to the lower end than to the upper end; and

a light shielding device located adjacent the base and including a first edge and a second edge non-parallel to the first edge and abutting the first edge at a junction,

wherein each of the plurality of secondary LED elements is disposed along at least one of the first edge and the second edge of the light shielding device.

11. The light source according to claim 10, further comprising:

a flat lens located above the primary LED element and the plurality of secondary LED elements, and the light shielding device is located above the flat lens.

12. The light source according to claim 10, further comprising:

a projection lens located in a light emitting direction with respect to the light source.

13. The light source according to claim 10, wherein the plurality of secondary LED elements includes three LED elements spaced from and unobstructed by the light shielding device as viewed along the optical axis of the light source, and the primary LED element obstructed by and intersecting with the light shielding device as viewed from the optical axis of the light source.

14. The light source according to claim 10, wherein the secondary LED elements are aligned to extend along and be substantially parallel with immediately adjacent portions of the at least one of the first edge and the second edge of the light shielding device.

19. The light source according to claim 10, further comprising;

a drive device configured to supply different drive currents to the primary LED element and the plurality of secondary LED elements, wherein at least one of the primary LED element and the plurality of secondary LED elements is driven by a different drive current as compared to another of the primary LED element and the plurality of secondary LED elements.

20. The light source according to claim 10, wherein the second edge abuts the first edge at an angle formed between an extension of the first edge from the junction and the second edge and being between substantially 15 and 45 degrees.

15. A vehicle headlight comprising:

a first convex lens having a first focal point;

an LED light source spaced from the first focal point;

a light shielding device located substantially at the first focal point and including a first edge and a second edge non-parallel to the first edge and abutting the first edge at a junction; and

a second convex lens system intermediate the LED light source and the light shielding device, the second convex lens system having a second focal point and a third focal point, wherein the second focal point is located substantially at the first focal point, and the third focal point is located substantially at the LED light source.

16. The vehicle headlight of claim 15, wherein the second convex lens system includes a primary convex lens located adjacent to a secondary convex lens.

17. The vehicle headlight of claim 15, wherein the LED light source includes,

a base,

a first plurality of LED elements located adjacent the base, and

a second plurality of LED elements located adjacent the base, each of the second plurality of LED elements dimensioned smaller than each of the first plurality of LED elements as viewed from a light emitting direction axis of the LED light source.

18. The light source according to claiml, further comprising;

a drive device configured to supply different drive currents to the first plurality of LED elements and the second plurality of LED elements, wherein at least one of the first plurality of LED elements and the second plurality of LED elements is driven by a different drive current as compared to another of the first plurality of LED elements and the second plurality of LED elements.