Illuminating apparatus and light emitting diode

• US 6,328,456 B1
• Filed: 03/24/2000
• Issued: 12/11/2001
• Est. Priority Date: 03/24/2000
• Status: Expired due to Fees

• Current Assignee: Ledcorp
• Original Assignee: Ledcorp
• Inventors: Mize, John V.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): TRUONG, BAO Q
• Application Number:
  US09/534,768
• Time in Patent Office: 627 Days
• Field of Search: 362/311, 362/800, 362/327, 362/328, 362/329, 362/256, 362/310, 362/363, 313/512
• US Class Current: 362/311.02
• CPC Class Codes: F21L 4/027 the light sources being a LED
• CPC Class Codes: F21V 14/045 in portable lighting devices
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 33/483 Containers
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

The present invention is directed to an LED lamp and method of using one or more lamps, and portable lighting products such as flashlights using such LED lamp(s). The LED lamp according to the invention provides uniformly distributed light that radiates spherically approximately 270° in all directions, both radially and axially. This newly designed lamp is ideally suited as a source of illumination for beam lights of the type employing reflective surfaces to produce a beam of light. The at least one chip is encased in at least one envelope surrounding the chip, with the envelope extending from a first position below the position of the at least one chip to a second position above the chip position. The second position of the envelope forms a lens in from of the at least one chip with the surface of the lens being configured and positioned relative to the ship such that a substantially uniform portion of light emitted from the chip is reflected off of the surface. In this manner, light is radiated spherically over an angle up to 270° relative to the chip position. In the preferred embodiment, the envelope is formed as a cylinder at its lower position and the lens is formed as a transitional surface extending from a position below the position of the chip at an angle or curvature inward from the cylindrical position to encase the chip.

Claims

1. An LED lamp comprising at least one semiconductor chip coupled to a source of electrical power, said at least one chip being encased in at least one envelope surrounding said at least one chip, said at least one envelope having a first portion with a central axis and at least one side wall, and a second portion adjacent to said first portion, said second portion forming a lens in front of said at least one chip with the surface of said lens being configured and positioned relative to said at least one chip such that a substantially uniform portion of light emitted from said at least one chip is reflected off of said surface, such that light is radiated spherically over an angle greater than 180°

relative to said chip position.

2. The LED of claim 1, wherein said chip is located at a position equal to or above the interface between said first and second portions at a predetermined distance from said surface of said second portion.

3. The LED of claim 1, wherein said surface is hemispherical.

4. The LED of claim 1, wherein said surface has at least one planar portion and at least one curved portion.

5. The LED of claim 1, wherein said first portion is cylindrically shaped.

6. The LED of claim 1, wherein said surface causes internal reflection of at least a portion of light incident thereon.

7. The LED of claim 1, wherein said chip is located at a position equal to or above the interface between said first and second portions.

8. The LED of claim 1, wherein said chip is located at a predetermined distance along the central axis from said surface of said second portion.

9. The LED of claim 8, wherein said predetermined distance is greater than zero up to approximately {fraction (3/16)} of an inch.

10. The LED of claim 8, wherein the predetermined distance is approximately between 0.02 inches to 0.06 inches.

11. The LED of claim 1, wherein said surface of said second portion extends to a position at or below the position of said at least one chip at a point orthogonal to said central axis, and is angled with respect to said central axis at said point.

12. The LED of claim 11, wherein said surface is angled 70°

or less at said point.

13. The LED of claim 1, wherein said surface is textured over at least a portion thereof.

14. The LED of claim 1, wherein the interface between said first and second portions is rounded.

15. The LED of claim 1, wherein said surface comprises a plurality of discrete surfaces which are continuous with one another.

16. The LED of claim 15, wherein said plurality of discrete surfaces comprise a plurality of planar surfaces.

17. The LED of claim 16, wherein said plurality of planar surfaces are angled with respect to one another.

18. The LED of claim 17, wherein said plurality of surfaces extend from a point on said surface along said central axis to the interface with said first portion.

19. The LED of claim 16, wherein said plurality of said surfaces extend generally orthogonal to said central axis.

20. The LED of claim 1, wherein said surface is translucent over at least a portion thereof.

21. The LED of claim 1, wherein a plurality of LED'"'"'s are used in an LED array.

22. An illumination device comprising,

a source of electrical power, at least one LED lamp selectively coupled to said source of electrical power, said at least one LED having at least one semiconductor chip encased in at least one envelope surrounding said at least one chip, said at least one envelope having a first portion with a central axis and at least one sidewall, and a second portion adjacent to said first portion, said second portion forming a lens in front of said at least one chip with the surface of said lens being configured and positioned relative to said at least one chip such that a substantially uniform portion of light emitting from said at least one chip is reflected off said surface, such that light is radiated spherically over an angle greater than 180°

relative to said chip position, and at least one reflector positioned relative to the location of said LED to capture light emitted from said LED and reflect said light in a predetermined manner.

23. The illumination device of claim 22, wherein said reflector is selected from the group consisting of spherical, parabolic, elliptical or aspheric.

24. The illumination device of claim 22, wherein the position of the at least one LED with respect to said reflector is variable.