Optical elements with internal optical features and methods of fabricating same

• US 8,123,384 B2
• Filed: 07/16/2008
• Issued: 02/28/2012
• Est. Priority Date: 07/17/2007
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Negley, Gerald H., Pickard, Paul Kenneth
• Primary Examiner(s): TSO, LAURA K
• Application Number:
  US12/174,053
• Publication Number:
  US 20090021841A1
• Time in Patent Office: 1,322 Days
• Field of Search: 362/330, 362/331
• US Class Current: 362/331
• CPC Class Codes: F21K 9/68 Details of reflectors forming part of the light source
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 5/021 the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
• CPC Class Codes: G02B 5/0231 the surface having microprismatic or micropyramidal shape macroscopic prism arrays G02B5/045
• CPC Class Codes: G02B 5/0268 characterized by the fabrication or manufacturing method
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor

Abstract

An optical element, comprising a substrate and at least one optical film. The substrate is at least partially light-transmissive. The optical film comprises at least a first optical feature and is positioned on a contact surface of the substrate. Also, a lighting device comprising at least one solid state light emitter and such an optical element. Also, methods for making an optical element by molding (e.g., film insert molding), bonding or laminating.

Claims

1. An optical element, comprising:

a substrate, said substrate at least partially light-transmissive, said substrate comprising a contact surface;

at least one optical film, said optical film on said contact surface of said substrate, said optical film comprising at least a first optical feature, said optical film comprising an optical film first surface, and an optical film second surface,

said optical film second surface in contact with said contact surface of said substrate,

said optical film second surface substantially smooth, and

said optical film first surface substantially smooth.

2. An optical element as recited in claim 1, wherein said optical film is directly on said contact surface of said substrate.

3. An optical element as recited in claim 1, wherein a first region of said optical film second surface is substantially uniformly spaced from said contact surface, said first region comprising at least half of said optical film second surface.

4. An optical element as recited in claim 1, wherein a first region of said optical film second surface is in direct contact with said contact surface, said first region comprising at least half of said optical film second surface.

5. An optical element as recited in claim 1, wherein said optical film first surface is substantially uniformly spaced from said optical film second surface.

20. An optical element as recited in claim 1, wherein said substrate is substantially translucent.

21. An optical element as recited in claim 1, wherein said substrate is substantially transparent.

22. An optical element as recited in claim 1, wherein said substrate is lens-shaped.

23. An optical element as recited in claim 1, wherein said substrate comprises a substrate second surface, said substrate second surface comprising at least a third optical feature.

24. An optical element as recited in claim 23, wherein said substrate second surface is opposite from said contact surface.

25. An optical element as recited in claim 24, wherein said substrate second surface is substantially parallel to said contact surface.

26. An optical element as recited in claim 1, wherein said optical film diffuses light passing through said optical film.

27. An optical element as recited in claim 1, wherein said optical film mixes light passing through said optical film.

28. An optical element as recited in claim 1, wherein said optical film and said substrate are adhesively bonded to each other.

29. An optical element as recited in claim 1, wherein said optical film and said substrate are molded together.

30. An optical element as recited in claim 1, wherein said optical film and said substrate are laminated together.

31. An optical element as recited in claim 30, wherein said optical film and said substrate are coextruded.

32. An optical element as recited in claim 1, wherein said substrate comprises polycarbonate.

33. An optical element as recited in claim 32, wherein said optical film comprises polycarbonate.

34. An optical element as recited in claim 1, wherein said optical film comprises polycarbonate.

35. A lighting device, comprising:

at least one optical element as recited in claim 1; and

at least one solid state light emitter,

said solid state light emitter and said optical element positioned and oriented relative to one another such that if light is emitted from said solid state light emitter, at least a portion of said light will pass through said optical element.

36. A lighting device as recited in claim 35, wherein said lighting device comprises a plurality of solid state light emitters, said solid state light emitters and said optical element positioned and oriented relative to one another such that for each said solid state light emitter, if light is emitted from said solid state light emitter, at least a portion of said light will pass through said optical element.

37. A lighting device as recited in claim 35, wherein said lighting device is in the shape of a light bulb, a conventional reflector light or a downlight.

38. An illuminated enclosure, comprising an enclosed space and at least one lighting device as recited in claim 35, wherein said lighting device illuminates at least a portion of said enclosure.

39. An illuminated surface, comprising a surface and at least one lighting device as recited in claim 35, wherein if said lighting device is illuminated, said lighting device would illuminate at least a portion of said surface.

40. An illuminated area, comprising at least one item selected from among the group consisting of a swimming pool, a room, a warehouse, an indicator, a road, a vehicle, a road sign, a billboard, a ship, a toy, a mirror, a vessel, an electronic device, a boat, an aircraft, a stadium, a computer, a remote audio device, a remote video device, a cell phone, a tree, a window, a yard, a lamppost, an indicator light, or a device or array of devices that illuminate an enclosure, or a device that is used for edge or back-lighting, having mounted therein or thereon at least one lighting device as recited in claim 35.

6. An optical element comprising:

a substrate, said substrate at least partially light-transmissive, said substrate comprising a contact surface;

at least one optical film, said optical film on said contact surface of said substrate, said optical film comprising at least a first optical feature,

said optical film comprising an optical film first surface and an optical film second surface,

said optical film second surface in contact with said contact surface of said substrate,

said optical film comprising at least a first layer and a second layer,

a first layer first surface of said first layer comprising said optical film first surface,

said first layer further comprising a first layer second surface,

said first optical feature on said first layer second surface,

a second layer second surface of said second layer comprising said optical film second surface,

said second layer further comprising a second layer first surface, and

said first layer second surface in contact with said second layer first surface.

7. An optical element as recited in claim 6, wherein said optical film further comprises at least one intermediate material between said first layer and said second layer.

8. An optical element as recited in claim 7, wherein said intermediate material comprises a solid material.

9. An optical element as recited in claim 7, wherein said intermediate material comprises air.

10. An optical element as recited in claim 6, wherein said first layer second surface is in direct contact with said second layer first surface.

11. An optical element as recited in claim 6, wherein said second layer second surface is substantially smooth.

12. An optical element as recited in claim 11, wherein said first layer first surface is substantially smooth.

13. An optical element as recited in claim 6, wherein said first layer first surface is substantially smooth.

14. An optical element as recited in claim 6, wherein said second layer first surface comprises at least a second optical feature.

15. An optical element as recited in claim 6, wherein said first layer first surface is opposite said first layer second surface.

16. An optical element as recited in claim 6, wherein said second layer first surface is opposite said second layer second surface.

17. An optical element comprising:

a substrate, said substrate at least partially light-transmissive, said substrate comprising a contact surface;

at least one optical film, said optical film on said contact surface of said substrate, said optical film comprising at least a first optical feature,

said optical film comprising a first layer,

said first layer comprising a first layer first surface and a first layer second surface,

said first layer second surface in contact with said contact surface of said substrate,

said first optical feature on said first layer first surface.

18. An optical element as recited in claim 17, wherein said first layer second surface is substantially smooth.

19. An optical element as recited in claim 17, wherein said first layer first surface is opposite said first layer second surface.

41. An optical element as recited in claim 17, wherein:

said optical film comprises a second layer,

said second layer comprises a second layer first surface and a second layer second surface, and

said second layer second surface faces said first layer first surface.

42. An optical element as recited in claim 41, wherein said second layer second surface comprises at least a second optical feature.

43. An optical element comprising:

a substrate, said substrate at least partially light-transmissive, said substrate comprising a contact surface;

at least one optical film, said optical film comprising at least a first layer and a second layer,

said first layer comprising a first layer first surface and a first layer second surface,

said second layer comprising a second layer first surface and a second layer second surface,

said second layer second surface in contact with said contact surface of said substrate,

said first layer second surface facing said second layer first surface,

at least a first optical feature on said first layer second surface.

44. An optical element, comprising:

a substrate, said substrate at least partially light-transmissive, said substrate comprising a contact surface;

at least one optical film, said optical film on said contact surface of said substrate, said optical film comprising at least a first optical feature,

said optical film and said substrate molded together.