Method for making collimating or transflecting film having a reflective layer

• US 7,518,801 B2
• Filed: 06/16/2006
• Issued: 04/14/2009
• Est. Priority Date: 03/26/2002
• Status: Expired due to Fees

• Current Assignee: Rambus Delaware LLC (Rambus Inc.)
• Original Assignee: Brilliant Film, LLC
• Inventors: Spilizewski, Karen, Davis, Donald J., Wojciechowski, Timothy J., Lubart, Neil D., Lash, Thomas E.
• Primary Examiner(s): Harrington; Alicia M
• Application Number:
  US11/454,521
• Publication Number:
  US 20060291067A1
• Time in Patent Office: 1,033 Days
• Field of Search: 359/619, 359/620, 359/625, 359/627, 359/459, 359/641
• US Class Current: 359/620
• CPC Class Codes: G02B 17/002 Arrays of reflective systems
• CPC Class Codes: G02B 27/30 Collimators

Abstract

A method for manufacturing a collimating device is disclosed herein. In one embodiment the method includes a step of constructing a reflective layer. After the reflective layer is constructed, a step of constructing an optical element layer follows, including a step of forming an array of microstructures in the optical element layer. Next, the array of microstructures is abutted against the reflective layer. Heat and pressure are then applied to the optical element layer to puncture the reflective layer and penetrate a predetermined distance through the reflective layer. Sub-assemblies are also defined, wherein optical elements are coupled to prevent light loss.

Claims

1. A method for manufacturing a collimating device comprising the steps of:

providing a reflective layer;

providing an optical element layer;

forming an array of microstructures in the optical element layer;

abutting the array of microstructures of the optical element layer against the reflective layer;

applying heat or pressure to the optical element layer to puncture the reflective layer; and

penetrating the array of microstructures a predetermined distance through the reflective layer.

2. The method of claim 1, wherein the forming step includes micro machining the optical element layer to form the array of microstructures.

3. The method of claim 1, wherein the forming step includes forming the microstructures with a sidewall profile according to the equation:

(X+k₁)²+(Y+k₂)²=k₃².

4. The method of claim 3, wherein the forming step includes forming microstructures with a depth selected to result in a desired aperture in the reflective layer.

5. The method of claim 1, wherein the forming step includes forming microstructures having a flat top surface.

6. The method of claim 1, further comprising steps of:

providing an immersion layer; and

applying the immersion layer to the reflective layer.

7. The method of claim 6, wherein the immersion layer is a pressure sensitive adhesive.

8. The method of claim 6, further comprising a step of selecting an immersion layer that is softer than the optical element layer and has an index of refraction less than or equal to that of the optical element layer.

9. The method of claim 6, wherein the immersion layer has an index of refraction lower than that of the optical element layer.

10. The method of claim 6, wherein the immersion layer has an index of refraction greater than or equal to that of the optical element layer.

11. The method of claim 6, wherein:

the step of providing the immersion layer includes a step of combining at least a first immersion layer and a second immersion layer; and

the step of applying the immersion layer to the reflective layer includes a step of applying the first immersion layer to the reflective layer.

12. The method of claim 11, wherein the first immersion layer is softer than the optical element layer and has an index of refraction substantially equal to that of the optical element layer.

13. The method of claim 11, wherein the second immersion layer is as hard or harder than the optical element layer and has an index of refraction substantially equal to that of the optical element layer.

14. The method of claim 11, wherein the step of penetrating the array of microstructures a predetermined distance through the reflective layer includes a step of penetrating the array of microstructures through the first immersion layer such that the ends of the microstructures abut the second immersion layer.

15. The method of claim 1, wherein the forming step includes forming cross channels in the optical element layer.

16. The method of claim 1, wherein the forming step includes forming lenticular channels in the optical element layer.

17. The method of claim 16, further comprising a step of making a plurality of shallow cuts in the microstructures.

18. The method of claim 16, wherein the shallow cuts have a depth less than the predetermined distance the array of microstructures penetrate the reflective layer.

19. The method of claim 16, wherein the shallow cuts are formed with a curved profile according to the equation:

(X+k₁)²+(Y+k₂)²=k₃².

20. The method of claim 1, further comprising a step of applying a spacing layer to the reflective layer on the same side that abuts the array of array of microstructures of the optical element layer.

21. The method of claim 20, wherein the spacing layer is a pressure sensitive adhesive.

22. The method of claim 20, wherein the spacing layer is softer than the optical element layer and has lower index of refraction than the optical element layer.

23. A method of making a light manipulating device comprising the steps of:

forming an array of lenticular channels in a light transmitting layer;

forming an array of shallow cuts orthogonal to the lenticular channels;

abutting the light transmitting layer against a reflecting layer; and

piercing the reflecting layer with the light transmitting layer.

24. The method of claim 23, further comprising a step of applying a second light transmitting layer to the reflecting layer.

25. The method of claim 23, further comprising a step of aligning the light transmitting layer with a back light such that light from the backlight is collimated.

26. The method of claim 23, wherein the step of forming lenticular channels includes forming lenticular channels to a first depth, the step of forming shallow cuts includes forming shallow cuts to a second depth less than the first depth, and the step of piercing the reflecting layer includes piercing the reflective layer to a third depth, wherein the third depth is greater than the second depth and less than the first depth.

27. The method of claim 23, further comprising a step of applying a non-light transmitting layer to the reflecting layer.

28. The method of claim 23, further comprising a step of aligning the light transmitting layer with a back light such that light from the backlight is transmitted through the light transmitting layer while light from a second source is reflected by the reflecting layer.

29. A method of making a light manipulating device comprising the steps of:

forming a first array of channels in a light transmitting layer;

forming a second array of channels in the light transmitting layer, orthogonal to the first array of channels;

abutting the light transmitting layer against a reflecting layer; and

urging portions of the light transmitting layer through the reflecting layer such that light passing through the portions of the light transmitting layer extending beyond the reflecting layer is unimpeded, while light impinging on the reflecting layer is reflected.

30. The method of claim 29, further comprising a step of applying a second light transmitting layer to the reflecting layer.

31. The method of claim 30, further comprising a step of applying a third light transmitting layer to the second light transmitting layer.

32. The method of claim 29, further comprising a step of selecting a location and orientation of the of the first array of channels and selecting a location and orientation of the second array of channels such that a plurality of flat, square surfaces are created.

33. The method of claim 29, wherein the first array of channels and the second array of channels are formed with a curved profile according to the equation:

(X+k₁)²+(Y+k₂)²=k₃².

34. The method of claim 29, further comprising a step of applying a non-light transmitting layer to the reflecting layer.