3-dimensional curved substrate lamination

• US 8,857,490 B2
• Filed: 05/01/2012
• Issued: 10/14/2014
• Est. Priority Date: 05/07/2008
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Sung, Kuo-Hua, Edwards, Troy, Feinstein, Casey, Zhong, John, Hotelling, Steven Porter, Lauder, Andrew David
• Primary Examiner(s): Minskey, Jacob Thomas
• Assistant Examiner(s): Patel, Vishal I
• Application Number:
  US13/461,579
• Publication Number:
  US 20120211148A1
• Time in Patent Office: 896 Days
• Field of Search: 156/579, 156/87, 156/99, 156/286, 156/86, 156/576
• US Class Current: 156/576
• CPC Class Codes: B29C 63/0047 Preventing air-inclusions
• CPC Class Codes: B29C 63/0073 of non-flat surfaces, e.g. curved, profiled B29C63/042 takes precedence
• CPC Class Codes: B32B 17/10 of synthetic resin
• CPC Class Codes: B32B 2037/264 Pressure equalizing layers
• CPC Class Codes: B32B 2038/047 Perforating
• CPC Class Codes: B32B 2457/00 Electrical equipment
• CPC Class Codes: B32B 37/003 to avoid air inclusion
• CPC Class Codes: B32B 37/0053 Constructional details of laminating machines comprising rollers; Constructional features of the rollers
• CPC Class Codes: B32B 37/10 characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
• CPC Class Codes: B32B 37/12 characterised by using adhesives
• CPC Class Codes: B32B 38/1858 using vacuum
• CPC Class Codes: B32B 38/1866 conforming the layers or laminate to a convex or concave profile
• CPC Class Codes: G06F 3/03543 Mice or pucks G06F3/03541 takes precedence
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 156/1028 by bending, drawing or stretch forming sheet to assume shape of configured lamina while in contact therewith
• CPC Class Codes: Y10T 156/17 Surface bonding means and/or assemblymeans with work feeding or handling means
• CPC Class Codes: Y10T 156/1793 Grip or clamp for web end
• CPC Class Codes: Y10T 156/18 Surface bonding means and/or assembly means with handle or handgrip

Abstract

A method of laminating a surface of a flexible material to a surface of a rigid, curved material. The method includes pressing an area of the surface of the flexible material into the surface of the rigid, curved material with a holder to create a contact area while the flexible material is conformed to the holder, which has a curvature greater than a curvature of the rigid, curved material surface; and changing the contact area between the surface of the flexible material and the surface of the rigid, curved material while maintaining pressure on the contact area until the surface of the flexible material and the surface of the rigid curved material are laminated.

Claims

1. An apparatus for laminating a surface of a flexible circuit to a surface of a curved material, the apparatus comprising:

a first holder configured for contacting the flexible circuit;

a second holder configured for contacting the curved material, wherein the flexible circuit has cut out portions permitting the flexible circuit to conform to a curved surface of the curved material; and

a pressure applying device configured for creating and changing a pressure region between the surface of the flexible circuit and the surface of the curved material,

wherein the pressure applying device is further configured for changing the pressure region to laminate the flexible circuit having cut out portions to the curved material and remove air bubbles between the laminated flexible circuit and the curved material; and

a gripping structure configured to hold a portion of the flexible material at a region of the flexible material that is different from the pressure region between the surface of the flexible circuit and the surface of the curved material, wherein the gripping structure is configured to slide along a surface of an unattached portion of the flexible material parallel to the second holder.

2. The apparatus of claim 1, the pressure applying device further configured for initially establishing the pressure region at a center of the surface of the curved material, and expanding the pressure region from the center of the surface of the curved material towards an edge of the curved material by increasing pressure between the surface of the flexible circuit and the surface of the curved material in the pressure region.

3. The apparatus of claim 1, the pressure applying device further configured for initially establishing the pressure region at a first edge of the surface of the curved material, and shifting the pressure region from the first edge of the surface of the curved material to a second edge of the surface of the curved material.

4. The apparatus of claim 1, wherein the pressure applying device is further configured to laminate the flexible circuit having a butterfly configuration to the curved material.

5. The apparatus of claim 1, wherein the flexible circuit comprises a plurality of conductive traces on its surface and an insulating layer deposited over the conductive traces, wherein the pressure applying device is further configured to laminate the flexible circuit having the plurality of conductive traces and the insulating layer to the curved material.

6. The apparatus of claim 1, wherein the apparatus is further configured to form part of a sensor array of a multi-touch mouse by laminating the flexible circuit to the curved material.

7. The apparatus of claim 1, wherein the apparatus is further configured to laminate the flexible circuit to the curved material with an adhesive adapted to laminate the flexible circuit and the curved material, the adhesive selected from a group consisting of pressure-sensitive adhesives (PSAs), re-workable PSAs, thermoplastic film, thermoset film, thermal cure liquid, UV curing liquid, and multiple-component adhesives.

8. The apparatus of claim 1, wherein at least one of the first or second holder comprises suctioning vacuum holes adapted to hold the material.

9. The apparatus of claim 1, wherein the second holder comprises retracted alignment pins for aligning the flexible circuit with the second holder.

10. The apparatus of claim 1, wherein the first holder is made of a deformable material.

11. The apparatus of claim 1, wherein the pressure applying device is adapted to change an amount of pressure applied to the surface of the flexible circuit and the surface of the curved material.

12. The apparatus of claim 1, wherein the change of the pressure region is in response to a shape of at least one of the first holder and the second holder.

13. The apparatus of claim 1, further comprising a gimbal adapted to control movement of the pressure applying device and create a rolling motion of the first holder.

14. The apparatus of claim 1, further comprising a microbead surface adapted to be walked over the flexible material to remove air bubbles between the laminated flexible material and the curved material.

15. The apparatus of claim 1, wherein the first holder is a cylindrical roller adapted to roll across the surface of the curved material during lamination.

16. The apparatus of claim 15, wherein the second holder is a cylindrical roller, and wherein the first holder and the second holder rotate about an axis in opposite directions.

17. The apparatus of claim 1, wherein the first holder comprises a flexible membrane adapted to achieve uniform pressure on the surface of the curved material during lamination.

18. The apparatus of claim 17, wherein the flexible membrane is a conformal material or a liquid or air filled sac.

19. The apparatus of claim 1, wherein the first holder comprises an inflatable balloon.