Light emitting assembly

• US 20040239243A1
• Filed: 03/02/2004
• Published: 12/02/2004
• Est. Priority Date: 06/13/1996
• Status: Abandoned Application

• Current Assignee: John K. Roberts, Kathy E. Roberts, Robert C. Knapp, Robert R. Turnbull
• Original Assignee: John K. Roberts, Kathy E. Roberts, Robert C. Knapp, Robert R. Turnbull
• Inventors: Roberts, John K., Turnbull, Robert R., Knapp, Robert C., Roberts, Kathy E.
• Application Number:
  US10/791,667
• Publication Number:
  US 20040239243A1
• Time in Patent Office: Days
• US Class Current: 313/512
• CPC Class Codes: B60L 1/14 to electric lighting circuits
• CPC Class Codes: B60L 2200/12 Bikes
• CPC Class Codes: B60L 50/20 using propulsion power generated by humans or animals
• CPC Class Codes: B60Q 1/2665 on rear-view mirrors lighting devices for vehicle interior on or for rear-view mirrors B60Q3/258
• CPC Class Codes: B60Q 1/2696 Mounting of devices using LEDs
• CPC Class Codes: B60Q 2900/40 Several lamps activated in sequence, e.g. sweep effect, progressive activation
• CPC Class Codes: B60R 1/1207 with lamps; with turn indicators
• CPC Class Codes: B63B 45/00 Arrangements or adaptations of signalling or lighting devices arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; life-buoys, -belts, -jackets, -suits or the like, characterised by signalling means B63C9/20; lighting devices or systems therefor F21L, F21S
• CPC Class Codes: F21S 41/00 Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps reversing lights F21S43/00
• CPC Class Codes: F21S 41/141 Light emitting diodes [LED]
• CPC Class Codes: F21S 41/18 Combination of light sources of different types or shapes
• CPC Class Codes: F21S 41/25 Projection lenses
• CPC Class Codes: F21S 41/28 Cover glass
• CPC Class Codes: F21S 41/321 the reflector being a surface of revolution or a planar surface, e.g. truncated
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21S 43/235 Light guides
• CPC Class Codes: F21V 5/02 of prismatic shape F21V5/04 takes precedence
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 : connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 : the devices being arranged next to each other
• CPC Class Codes: H01L 25/13 : the devices being of a type provided for in group H01L33/00
• 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 2924/00012 : Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 : the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/1305 : Bipolar Junction Transistor [BJT]
• CPC Class Codes: H01L 2924/13091 : Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H01L 2924/181 : Encapsulation
• CPC Class Codes: H01L 2924/1815 : Shape
• CPC Class Codes: H01L 2924/30107 : Inductance
• CPC Class Codes: H05B 45/28 : using temperature feedback
• CPC Class Codes: H05B 45/40 : Details of LED load circuits

Abstract

A light emitting assembly having a first light source and a second light source. The first and second light sources are oriented such that when the first and second light sources emit light, light emitted from the first and second light sources overlaps and is capable of forming effective white light. The light emitted from the first light source exhibits color coordinates different from the light emitted from the second light source. One of the light sources may be a photoluminescent source, such as a fluorescent dye or phosphor.

Claims

1. A white light emitting device comprising:

a solid state first light source;

a second light source; and

a leadframe and an encapsulant, where said first light source is mounted on said leadframe and encapsulated by said encapsulant,

wherein said first and second light sources oriented such that when said first and second light sources emit light, light projected from said first and second light sources overlaps and is capable of forming effective white light, wherein the light projected from said first light source exhibits color coordinates different from the light projected from said second light source, and

wherein said leadframe includes a heat extraction member and a plurality of electrical leads, said heat extraction member providing a thermal path from said solid state first light source having a lower thermal resistance than a thermal path provided by said electrical leads.

2. The white light emitting device of claim 1, where said first light source emits blue light.

3. The white light emitting device of claim 1, where said first light source emits visible light.

4. The white light emitting device of claim 1, where said second light source is a photoluminescent source.

5. The white light emitting device of claim 4, where said photoluminescent source is disposed to receive light from said first light source.

6. The white light emitting device of claim 4, wherein said photoluminescent source is a fluorescent source.

7. The white light emitting device of claim 6, wherein said fluorescent source is a fluorescent dye.

8. The white light emitting device of claim 6, wherein said fluorescent source is a fluorescent crystal.

9. The white light emitting device of claim 6, wherein said fluorescent source is a fluorescent pigment.

10. The white light emitting device of claim 4, wherein said photoluminescent source is a phosphor source.

11. The white light emitting device of claim 4, wherein said photoluminescent source includes yttrium aluminum garnet.

12. The white light emitting device of claim 1, wherein said first light source is a semiconductor optical radiation emitter.

13. The white light emitting device of claim 1, wherein said leadframe includes three electrical leads.

14. The white light emitting device of claim 1, wherein said second light source is a semiconductor optical radiation emitter and is mounted on said leadframe and encapsulated by said encapsulant.

15. The white light emitting device of claim 1, wherein said radiation source is an LED.

16. The white light emitting device of claim 15, wherein said LED emits blue light.

17. A discrete light emitting diode component comprising:

a leadframe;

a polymer matrix enclosure;

an LED chip emitting light having a first hue, said LED chip is disposed on said leadframe and enclosed within said enclosure; and

a narrow band light emitter carried on said leadframe and emitting light of a hue different than emissions from said LED chip, said LED chip and said narrow band emitter disposed such that, when said LED chip and said narrow band emitter emit light, emissions from said LED chip overlap and mix with emissions from said narrow band emitter to form metameric white light,

wherein said leadframe includes a heat extraction member and a plurality of electrical leads, said heat extraction member providing a thermal path from said LED having a lower thermal resistance than a thermal path provided by said electrical leads.

18. The discrete light emitting diode component of claim 17, wherein said narrow band light emitter is an LED chip disposed on said leadframe and enclosed within said enclosure.

19. The discrete light emitting diode component of claim 17, wherein said narrow band light emitter is a photoluminescent material.

20. The discrete light emitting diode component of claim 17, wherein said LED chip emits light with a peak wavelength less than 505 nm and said narrow band light emitter emits light with a peak wavelength greater than 505 nm.