Methods of fixturing flexible circuit substrates and a processing carrier, processing a flexible circuit and processing a flexible circuit substrate relative to a processing carrier

• US 5,972,152 A
• Filed: 05/16/1997
• Issued: 10/26/1999
• Est. Priority Date: 05/16/1997
• Status: Expired due to Term

• Current Assignee: Round Rock Research LLC
• Original Assignee: Micron Communications, Inc. (Micron Technology, Inc.)
• Inventors: Tuttle, Mark E., Lake, Rickie C., Cirino, Clay L., Mousseau, Joseph P.
• Primary Examiner(s): Lorin, Francis J.
• Application Number:
  US08/858,021
• Time in Patent Office: 893 Days
• Field of Search: 174/253, 174/254, 174/255, 174/259, 156/192, 156/241, 156/232, 156/247, 156/249, 156/302, 156/297, 156/329, 156/344, 264/272.11, 264/272.17
• US Class Current: 156/247
• CPC Class Codes: H05K 1/0393 Flexible materials H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups
• CPC Class Codes: H05K 2203/0152 Temporary metallic carrier, e.g. for transferring material
• CPC Class Codes: H05K 2203/016 Temporary inorganic, non-metallic carrier, e.g. for processing or transferring
• CPC Class Codes: H05K 2203/0278 Flat pressure, e.g. for connecting terminals with anisotropic conductive adhesive
• CPC Class Codes: H05K 3/007 Manufacture or processing of a substrate for a printed circuit board supported by a temporary or sacrificial carrier H05K1/187, H05K3/20 and H05K3/4682 take precedence
• CPC Class Codes: Y10S 156/922 Specified electronic component delaminating in preparation for recycling
• CPC Class Codes: Y10T 156/11 Methods of delaminating, per se; i.e. , separating at bonding face

Abstract

Methods of fixturing a flexible circuit substrate to a processing carrier are disclosed. In one implementation, the flexible circuit substrate and processing carrier are attached with an adhesive film provided therebetween. The adhesive film comprises acrylic, silicone or a silicone acrylic blend in a preferred embodiment of the present invention. Ideally, substantially the total surface area of a first surface of the flexible circuit substrate is attached to the processing carrier. The flexible circuit substrate is removed from the adhesive film following processing thereof. In a preferred embodiment of the present invention, the adhesive film is monolithic. An electrical component is attached to the flexible circuit substrate and the flexible circuit substrate is encapsulated in accordance with one implementation of the present invention.

Claims

1. A method of fixturing a flexible circuit substrate and a processing carrier, comprising:

providing plural adhesive films;

providing a flexible circuit substrate;

providing a processing carrier; and

attaching the flexible circuit substrate and the processing carrier together with the adhesive films therebetween.

2. The method according to claim 1 wherein the plural adhesive films individually include one of a first adherent surface and a second adherent surface providing substantially equal degrees of adhesion force.

3. The method according to claim 1 wherein the adhesive films individually comprise one of silicone or acrylic.

4. The method according to claim 1 wherein the adhesive films individually comprise one of a blend of silicone and acrylic.

5. The method according to claim 1 wherein the adhesive films are pressure sensitive.

6. The method according to claim 1 wherein the attaching step comprises the steps of applying the adhesive films to the processing carrier and then pressing the flexible circuit substrate onto one of the adhesive films.

7. The method according to claim 1 wherein the flexible circuit substrate includes a first surface, and the attaching step comprises attaching substantially the total surface area of the first surface to one of the adhesive films.

8. The method according to claim 1 further comprising the step of separating the flexible circuit substrate and the adhesive films.

9. The method according to claim 1 wherein the processing carrier comprises a rigid plate.

10. The method according to claim 1 further comprising separating the flexible circuit substrate and the processing carrier following the attaching.

11. The method according to claim 1 wherein the plural adhesive films individually include one of a first adherent surface and a second adherent surface providing different degrees of adhesion force.

12. A method of processing a flexible circuit, comprising:

providing a processing carrier having a support surface;

providing a flexible circuit substrate having a first surface and a second surface;

providing a unitary adhesive film comprising plural adhesive films and the unitary adhesive film having a first adherent surface and a second adherent surface;

adhering the first adherent surface of the unitary adhesive film with the support surface of the processing carrier;

adhering the second adherent surface of the unitary adhesive film with the first surface of the flexible circuit substrate; and

processing the second surface of the flexible circuit substrate with the first adherent surface of the unitary adhesive film being adhered to the support surface of the processing carrier and the second adherent surface thereof being adhered to the first surface of the flexible circuit substrate.

13. The method according to claim 12 further comprising the step of separating the flexible circuit substrate and the unitary adhesive film.

14. The method according to claim 12 wherein the processing step includes at least one of attaching an electronic component and the flexible circuit substrate, and encapsulating the flexible circuit substrate.

15. The method according to claim 12 wherein the adhering of the second adherent surface comprises adhering substantially the total surface area of the first surface of the flexible circuit substrate to the unitary adhesive film.

16. A method of processing a flexible circuit substrate relative to a processing carrier, comprising:

providing a unitary adhesive film comprising plural adhesive films and the unitary adhesive film having a first adherent surface and a second adherent surface;

adhering the processing carrier and the first adherent surface of the unitary adhesive film;

adhering the flexible circuit substrate and the second adherent surface of the unitary adhesive film; and

after the adherings, separating the flexible circuit substrate and the second adherent surface of the unitary adhesive film with the first adherent surface and the processing carrier remaining adhered.

17. The method according to claim 16 further comprising the step of separating the unitary adhesive film and the processing carrier.

18. A method of fixturing a flexible circuit substrate and a processing carrier, comprising:

providing a flexible circuit substrate having a first surface;

providing a processing carrier having a support surface;

applying a first adhesion force using a first adhesive film against the support surface of the processing carrier; and

applying a second adhesion force using a second adhesive film against substantially the total surface area of the first surface of the flexible circuit substrate.

19. The method according to claim 18 wherein the second adhesion force is uniformly applied against the first surface of the flexible circuit substrate.

20. The method according to claim 18 wherein the first adhesion force and the second adhesion force are different.

21. The method according to claim 18 wherein the first adhesion force is greater than the second adhesion force.

22. The method according to claim 18 wherein the second adhesion force is greater than the first adhesion force.

23. A method of fixturing a flexible circuit substrate and a processing carrier, comprising:

providing a flexible circuit substrate having a first surface;

providing a processing carrier having a support surface; and

attaching substantially the total surface area of the first surface of the flexible circuit substrate and the support surface of the processing carrier using plural adhesive films intermediate the first surface of the flexible circuit substrate and the support surface of the processing carrier.

24. The method according to claim 23 further comprising separating the flexible circuit substrate and the processing carrier following the attaching.

25. A method of fixturing a flexible circuit substrate and a processing carrier, comprising:

providing a flexible circuit substrate having a first surface and a unitary adhesive film comprising plural adhesive films attached thereto;

providing a processing carrier having a support surface; and

attaching the unitary adhesive film and the support surface of the processing carrier.

26. The method according to claim 25 further comprising separating the flexible circuit substrate and the processing carrier following the attaching.

27. A method of processing a flexible circuit, comprising:

providing a processing carrier having a support surface;

providing a flexible circuit substrate having a first surface and a second surface;

fixturing the first surface of the flexible circuit substrate to the support surface of the processing carrier; and

covering the second surface of the flexible circuit substrate with an encapsulating material.

28. The method according to claim 27 wherein the fixturing comprises:

providing an adhesive film having a first adherent surface and a second adherent surface;

adhering the first adherent surface of the adhesive film with the support surface of the processing carrier; and

adhering the second adherent surface of the adhesive film with the first surface of the flexible circuit substrate.

29. The method according to claim 27 wherein the fixturing comprises attaching substantially the total surface area of the first surface to the adhesive film.

30. The method according to claim 27 further comprising the step of curing the encapsulating material into a hardened coating with the flexible circuit substrate fixtured to the processing carrier.

31. The method according to claim 27 further comprising the step of attaching an electronic component and the flexible circuit substrate.

32. The method according to claim 27 wherein the fixturing comprises fixturing using plural adhesive films.

33. A method of fixturing a flexible circuit substrate and a processing carrier, comprising:

providing a first film having a first adherent surface;

providing a second film having a second adherent surface;

joining the first and second films to form a unitary adhesive film having the first adherent surface and the second adherent surface on opposing outer sides thereof;

providing a flexible circuit substrate;

providing a processing carrier; and

attaching the flexible circuit substrate and the processing carrier together with the adhesive film therebetween.

34. The method according to claim 33 further comprising the steps of:

adhering the first adherent surface with the support surface of the processing carrier; and

adhering the second adherent surface with the first surface of the flexible circuit substrate.

35. The method according to claim 34 wherein the first adherent surface provides a first adhesion force and the second adherent surface provides a second adhesion force;

and the first adhesion force being greater than the second adhesion force.

36. The method according to claim 34 wherein the first adherent surface provides a first adhesion force and the second adherent surface provides a second adhesion force;

and the first adhesion force being less than the second adhesion force.

37. The method according to claim 33 further comprising separating the flexible circuit substrate and the processing carrier following the attaching.

38. The method according to claim 33 wherein the first adherent surface provides a first adhesion force and the second adherent surface provides a second adhesion force;

and the first adhesion force and second adhesion force being substantially equal.