Signal lamp incorporating spatially separated clustered light emitting devices

• US 20040165380A1
• Filed: 02/25/2003
• Published: 08/26/2004
• Est. Priority Date: 02/25/2003
• Status: Active Grant

• Current Assignee: Document Security Systems, Inc.
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Chew, Tong Fatt
• Granted Patent: US 7,021,807 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21W 2111/02 for roads, paths or the like
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

The invention provides a signal lamp utilizing clustered light emitting devices and method of making the same. The invention provides a signal lamp that includes a housing having an opening and including a substrate located opposite the opening, a lens disposed within the opening, and a plurality of clusters with each of the clusters comprising a plurality of light emitting devices. The clusters are disposed on the substrate to illuminate respective cluster illumination areas on the lens. Each of the cluster illumination areas has a circumference and a center. The circumference of each of the cluster illumination areas intersects the center of at least one other of the cluster illumination areas. An optical cover can be disposed over the opening.

Claims

1. A signal lamp comprising:

a housing having an opening and including a substrate, the substrate located opposite the opening;

a lens disposed within the opening; and

a plurality of clusters, each of the plurality of clusters comprising a plurality of light emitting devices;

wherein the clusters are disposed on the substrate to illuminate respective cluster illumination areas on the lens, each of the cluster illumination areas having a circumference and a center, the circumference of each of the cluster illumination areas intersecting the center of at least one other of the cluster illumination areas.

2. The signal lamp of claim 1, wherein the cluster illumination areas cover a majority of the area of the lens.

3. The signal lamp of claim 1, further comprising an optical cover disposed over the opening.

4. The signal lamp of claim 3, wherein the optical cover is selected from the group consisting of a transparent pane, a semi-transparent pane, a lens, a filter, a diffuser, a grating, and a mask.

5. The signal lamp of claim 3, wherein the optical cover is manufactured from a material selected from the group consisting of polycarbonate, polystyrene, acrylic, glass, and polypropylene.

6. The signal lamp of claim 1, wherein the lens is selected from the group consisting of a simple lens, a multi-prismed lens, a Fresnel lens, a multi-element lens, a filter, a diffuser, a grating, and a mask.

7. The signal lamp of claim 1, wherein the lens is manufactured from a material selected from the group consisting of polycarbonate, polystyrene, acrylic, glass, and polypropylene.

8. The signal lamp of claim 1, wherein the light emitting devices are selected from the group consisting of light-emitting diodes, visible light-emitting diodes, ultraviolet (UV) light-emitting diodes, laser diodes, visible light laser diodes, and ultraviolet (UV) laser diodes.

9. The signal lamp of claim 1, wherein the light emitting devices are arranged symmetrically in the cluster.

10. A method for manufacturing a signal lamp, the method comprising:

providing a housing, the housing having an opening and including a substrate, the substrate located opposite the opening;

disposing a plurality of clusters on the substrate, each of the clusters comprising a plurality of light emitting devices; and

disposing a lens within the opening;

wherein the clusters are disposed on the substrate to illuminate respective cluster illumination areas on the lens, each of the cluster illumination areas having a circumference and a center, the circumference of each of the cluster illumination areas intersecting the center of at least one other of the cluster illumination areas.

11. The method of claim 10, further comprising arranging the clusters so that the cluster illumination areas cover a majority of the area of the lens.

12. The method of claim 10, further comprising disposing an optical cover over the opening.

13. The method of claim 12, wherein the optical cover is selected from the group consisting of a transparent pane, a semi-transparent pane, a lens, a filter, a diffuser, a grating, and a mask.

14. The method of claim 12, wherein the optical cover is manufactured from a material selected from the group consisting of polycarbonate, polystyrene, acrylic, glass, and polypropylene.

15. The method of claim 10, wherein the lens is selected from the group consisting of a simple lens, a multi-prismed lens, a Fresnel lens, a multi-element lens, a filter, a diffuser, a grating, and a mask.

16. The method of claim 10, wherein the lens is manufactured from a material selected from the group consisting of polycarbonate, polystyrene, acrylic, glass, and polypropylene.

17. The method of claim 10, wherein the light emitting devices are selected from the group consisting of light-emitting diodes, visible light-emitting diodes, ultraviolet (UV) light-emitting diodes, laser diodes, visible light laser diodes, and ultraviolet (UV) laser diodes.

18. The method of claim 10, further comprising arranging the light emitting devices symmetrically in the cluster.

19. A signal lamp comprising:

a housing having an opening and including a substrate, the substrate located opposite the opening;

a lens disposed within the opening; and

a plurality of clusters, each of the clusters comprising a plurality of means for generating light;

wherein the clusters are disposed on the substrate to illuminate respective cluster illumination areas on the lens, each of cluster illumination areas having a circumference and a center, the circumference of each of the cluster illumination areas intersecting the center of at least one other of the cluster illumination areas.

20. The signal lamp of claim 19, further comprising means for covering the opening.