Methods of making a pattern of optical element shapes on a roll for use in making optical elements on or in substrates

• US 20040135273A1
• Filed: 12/23/2003
• Published: 07/15/2004
• Est. Priority Date: 06/27/1995
• Status: Abandoned Application

• Current Assignee: Rambus International Ltd (Rambus Inc.)
• Original Assignee: Rambus International Ltd (Rambus Inc.)
• Inventors: McCollum, Timothy A., Parker, Jeffery R., Starkey, Kurt R.
• Application Number:
  US10/744,276
• Publication Number:
  US 20040135273A1
• Time in Patent Office: Days
• US Class Current: 264/2.5
• CPC Class Codes: A61B 2090/309 using white LEDs
• CPC Class Codes: B29D 11/00288 made by a rotating cylinder
• CPC Class Codes: F21V 5/00 Refractors for light sources characterised by cooling arrangements F21V29/504
• CPC Class Codes: G02B 3/0006 Arrays G02B3/02, G02B5/188 take precedence
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02B 6/0018 Redirecting means on the surface of the light guide
• CPC Class Codes: G02B 6/0021 for housing at least a part of the light source, e.g. by forming holes or recesses
• CPC Class Codes: G02B 6/0028 Light guide, e.g. taper
• CPC Class Codes: G02B 6/0031 Reflecting element, sheet or layer
• CPC Class Codes: G02B 6/0036 2-D arrangement of prisms, protrusions, indentations or roughened surfaces
• CPC Class Codes: G02B 6/0038 Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
• CPC Class Codes: G02B 6/0043 provided on the surface of the light guide
• CPC Class Codes: G02B 6/0065 Manufacturing aspects; Material aspects
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: H01H 2219/062 Light conductor
• CPC Class Codes: H01H 2221/07 transparent

Abstract

The method involves cutting or forming one or more patterns of optical element shapes in the exterior surface of a sleeve or one or more curved substrates or films on a roll during rotation of the roll. Then at least a portion of the sleeve or substrates or films containing at least one pattern of optical element shapes is removed from the roll and the pattern of optical element shapes or a copy or inverse copy thereof is used to form a corresponding pattern of optical elements on or in an optical substrate.

Claims

1. A method of making at least one pattern of optical elements on or in an optical substrate comprising the steps of providing a sleeve on a roll, using a tool to cut or form at least one pattern of optical element shapes in an exterior surface of the sleeve, removing at least a portion of the sleeve containing at least the one pattern of optical element shapes from the roll, and using at least the one pattern of optical element shapes in the removed portion of the sleeve or on a copy or inverse copy of the optical element shapes in the removed portion of the sleeve to form a corresponding pattern of optical elements on or in an optical substrate.

2. The method of claim 1 wherein the optical element shapes in the removed portion of the sleeve are used to make the corresponding pattern of optical elements on the substrate.

3. The method of claim 1 wherein the optical element shapes on a copy or inverse copy of the optical element shapes in the removed portion of the sleeve are used to make a corresponding pattern of optical elements in the substrate.

4. The method of claim 1 wherein the optical elements are formed on or in the substrate by a molding process.

5. The method of claim 1 wherein the removed portion of the sleeve is used in production tooling.

6. The method of claim 1 wherein the removed portion of the sleeve is used as a master for production tooling.

7. The method of claim 6 wherein a deposition process is used.

8. The method of claim 1 wherein the optical elements are formed on or in the substrate by heating and pressing the substrate against the optical element shapes in the removed portion of the sleeve or on a copy or inverse copy.

9. The method of claim 1 wherein the optical elements are formed on or in the substrate by applying a flowable substrate material over the optical element shapes in the removed portion of the sleeve or on a copy or inverse copy, having the flowable substrate material cure or solidify, and removing the cured or solidified substrate material from the removed portion of the sleeve or the copy or inverse copy.

10. The method of claim 9 wherein the flowable substrate material is a self-curing material, a heat cured material, or an ultraviolet or radiant cured material.

11. The method of claim 1 wherein the sleeve is a preformed sleeve that is placed over the roll.

12. The method of claim 1 wherein the sleeve is deposited on the roll.

13. The method of claim 1 wherein the sleeve is a cured or solidified coating on the roll.

14. The method of claim 1 wherein a release coating is applied to an exterior surface of the roll prior to providing the sleeve on the roll.

15. The method of claim 14 wherein the sleeve is formed in situ on the roll by depositing a metal onto the release coating.

16. The method of claim 15 wherein the metal is deposited onto the release coating by a deposition process.

17. The method of claim 1 wherein the sleeve is made of nickel or a nickel alloy.

18. The method of claim 1 wherein the substrate is a film, sheet or plate.

19. The method of claim 1 further comprising the step of polishing, grinding, machining, fly cutting or turning an exterior surface of the sleeve prior to the cutting or forming steps.

20. The method of claim 19 wherein the exterior surface of the sleeve is polished using a paste, polishing belt or turning lathe.

21. The method of claim 1 wherein the tool is moved into and out of engagement with an exterior surface of the sleeve to form the optical element shapes while rotating the roll.

22. The method of claim 21 wherein the tool is moved longitudinally or transversely relative to the roll during or between cutting or forming steps.

23. The method of claim 21 wherein the tool is angularly adjusted relative to the roll during or between cutting or forming steps.

24. The method of claim 1 wherein multiple patterns of optical element shapes are cut or formed in the sleeve.

25. The method of claim 1 wherein the entire sleeve is removed from the roll after the cutting or forming step.

26. The method of claim 25 wherein the sleeve is cut lengthwise to remove the sleeve from the roll.

27. The method of claim 25 wherein the portion of the sleeve containing at least the one pattern of optical element shapes is removed from the sleeve after the sleeve has been removed from the roll.

28. The method of claim 1 wherein a controller is used to control movements of the tool during or between cutting or forming steps.

29. The method of claim 1 wherein the roll is machined, ground, polished, fly cut or turned to a precision finish prior to providing the sleeve on the roll.

30. The method of claim 1 wherein a metal coating is applied to the roll and machined, ground, polished, fly cut or turned to a precision finish prior to providing the sleeve on the roll.

31. The method of claim 1 wherein multiple patterns of optical element shapes are cut or formed in the sleeve, and multiple sleeve portions each containing at least one pattern of optical element shapes are removed from the sleeve.

32. The method of claim 31 wherein the sleeve is removed from the roll before the sleeve portions are removed from the sleeve.

33. The method of claim 1 wherein at least the one pattern of optical element shapes in the sleeve is a random pattern.

34. The method of claim 1 wherein at least the one pattern of optical element shapes in the sleeve is a predetermined pattern.

35. The method of claim 1 wherein at least some of the optical element shapes overlap, intersect or interlock one another.

36. The method of claim 1 wherein the optical element shapes vary in at least one of the following characteristics:

size, shape, placement, density, angle, depth, height and type.

37. The method of claim 1 wherein the optical element shapes cover substantially the entire surface of the portion of the sleeve containing at least the one pattern.

38. The method of claim 1 wherein the roll is rotated during the cutting or forming steps.

39. The method of claim 38 wherein a controller is used to control the rotation of the roll.

40. The method of claim 38 wherein a controller is used to control tool movements and roll rotation.

41. The method of claim 38 wherein the tool is moved into and out of engagement with the sleeve at least once per second during rotation of the roll to cut or form the optical element shapes in the sleeve.

42. The method of claim 38 wherein the rotation of the roll is greater than one revolution per minute during the cutting or forming steps.

43. The method of claim 1 further comprising the steps of forming the removed portion of the sleeve or a copy or inverse copy thereof into a predetermined shape, and using the shaped sleeve portion or copy or inverse copy thereof to produce the substrate.

44. The method of claim 1 wherein after at least some of the optical element shapes are cut or formed in the exterior surface of the sleeve, the roll is turned lengthwise 180°

and at least some additional optical element shapes are cut or formed in the exterior surface of the sleeve on the roll.

45. The method of claim 44 wherein the additional optical element shapes that are cut or formed in the sleeve face in a direction opposite to the optical element shapes that were cut or formed in the sleeve prior to turning the roll lengthwise.

46. The method of claim 44 wherein at least some of the additional optical element shapes are cut or formed in the sleeve between at least some of the optical element shapes that were cut or formed in the sleeve prior to turning the roll lengthwise.

47. The method of claim 1 wherein the optical element shapes only have two surfaces.

48. The method of claim 47 wherein at least one of the surfaces is curved.

49. The method of claim 48 wherein the curved surface is spherical, elliptical, or aspheric.

50. The method of claim 47 wherein both of the surfaces are curved.

51. The method of claim 47 wherein one of the surfaces is curved and the other surface is flat.

52. The method of claim 47 wherein the surfaces come together to form a ridge.

53. The method of claim 1 wherein the optical element shapes have at least two surfaces, and at least one of the surfaces is curved.

54. The method of claim 53 wherein the curved surface is spherical, elliptical, or aspheric.

55. The method of claim 53 wherein at least two of the surfaces are curved.

56. The method of claim 53 wherein at least one other surface is flat.

57. The method of claim 53 wherein at least the two surfaces come together to form a ridge.

58. A method of making at least one pattern of optical elements on or in an optical substrate comprising the steps of applying a coating to form a sleeve on a roll, moving a tool into and out of engagement with an exterior surface of the sleeve to cut or form at least one pattern of optical element shapes in the sleeve, removing at least a portion of the sleeve containing at least the one pattern of optical element shapes from the roll, and using at least the one pattern of optical element shapes in the removed portion of the sleeve or a copy or inverse copy of the optical element shapes in the removed portion of the sleeve to form a corresponding pattern of optical elements on or in an optical substrate.

59. The method of claim 58 wherein the roll is rotated during the cutting or forming steps.

60. The method of claim 58 wherein the substrate is a film, sheet or plate.

61. The method of claim 58 further comprising the steps of forming the removed portion of the sleeve or a copy or inverse copy thereof into a predetermined shape, and using the shaped removed portion of the sleeve or a copy or inverse copy thereof to produce the substrate.

62. A method of making at least one pattern of optical elements on or in an optical substrate comprising the steps of providing at least one curved substrate or film on a roll, rotating the roll, using a tool to cut or form at least one pattern of optical element shapes in an exterior surface of the substrate or film, removing at least a portion of the substrate or film containing at least the one pattern of optical element shapes from the roll, and using at least the one pattern of optical element shapes in the removed portion of the substrate or film or on a copy or inverse copy of the optical element shapes in the removed portion of the substrate or film to form a corresponding pattern of optical elements on or in an optical substrate.

63. The method of claim 62 wherein the optical element shapes in the removed portion of the substrate or film are used to make the corresponding pattern of optical elements on the optical substrate.

64. The method of claim 62 wherein the optical element shapes on a copy or inverse copy of the optical element shapes in the removed portion of the substrate or film are used to make a corresponding pattern of optical elements in the optical substrate.

65. The method of claim 62 wherein the removed portion of the substrate or film is used in production tooling.

66. The method of claim 62 wherein the removed portion of the substrate or film is used as a master for production tooling.

67. The method of claim 62 wherein the substrate or film is made of nickel or a nickel alloy.

68. The method of claim 62 wherein the optical substrate is a film, sheet or plate.

69. The method of claim 62 wherein the tool is moved into and out of engagement with an exterior surface of the substrate or film to form the optical element shapes while rotating the roll.

70. The method of claim 69 wherein the tool is moved longitudinally or transversely relative to the roll during or between cutting or forming steps.

71. The method of claim 69 wherein the tool is angularly adjusted relative to the roll during or between cutting or forming steps.

72. The method of claim 62 wherein multiple patterns of optical element shapes are cut or formed in the substrate or film.

73. The method of claim 62 wherein a controller is used to control movements of the tool and roll during or between cutting or forming steps.

74. The method of claim 62 wherein patterns of optical element shapes are cut or formed in a plurality of substrates or films on the roll.

75. The method of claim 62 wherein the optical element shapes cover substantially the entire surface of the portion of the substrate or film containing at least the one pattern.

76. The method of claim 62 further comprising the steps of forming the removed portion of the substrate or film or a copy or inverse copy thereof into a predetermined shape, and using the shaped portion of the substrate or film or a copy or inverse copy thereof to produce the optical substrate.

77. The method of claim 62 wherein after at least some of the optical element shapes are cut or formed in the exterior surface of the substrate or film, the roll is turned lengthwise 180°

and the same tool is used to cut or form at least some additional optical element shapes in the exterior surface of the substrate or film on the roll while rotating the roll.

78. The method of claim 77 wherein the additional optical element shapes that are cut or formed in the substrate or film face in a direction opposite to the optical element shapes that were cut or formed in the substrate or film prior to turning the roll lengthwise.

79. The method of claim 77 wherein at least some of the additional optical element shapes are cut or formed in the substrate or film between at least some of the optical element shapes that were cut or formed in the substrate or film prior to turning the roll lengthwise.

80. The method of claim 62 wherein the optical element shapes only have two surfaces.

81. The method of claim 80 wherein at least one of the surfaces is curved.

82. The method of claim 81 wherein the curved surface is spherical, elliptical or aspheric.

83. The method of claim 80 wherein both of the surfaces are curved.

84. The method of claim 80 wherein one of the surfaces is curved and the other surface is flat.

85. The method of claim 80 wherein the surfaces come together to form a ridge.

86. The method of claim 62 wherein the optical element shapes have at least two surfaces, and at least one of the surfaces is curved.

87. The method of claim 86 wherein the curved surface is spherical, elliptical, or aspheric.

88. The method of claim 86 wherein at least two of the surfaces are curved.

89. The method of claim 86 wherein at least one other surface is flat.

90. The method of claim 86 wherein at least the two surfaces come together to form a ridge.