Folded printed circuit assemblies and related methods

• US 10,231,337 B2
• Filed: 12/16/2015
• Issued: 03/12/2019
• Est. Priority Date: 12/16/2014
• Status: Active Grant

• Current Assignee: Inertial Sense, Inc.
• Original Assignee: Inertial Sense, Inc.
• Inventors: Johnson, Walter H.
• Primary Examiner(s): Musser, Barbara J
• Application Number:
  US14/971,660
• Publication Number:
  US 20160174378A1
• Time in Patent Office: 1,182 Days
• Field of Search: None
• CPC Class Codes: H05K 1/144 Stacked arrangements of planar printed circuit boards
• CPC Class Codes: H05K 1/147 at least one of the printed circuits being bent or folded, e.g. by using a flexible printed circuit H05K1/148 takes precedence
• CPC Class Codes: H05K 1/148 Arrangements of two or more hingeably connected rigid printed circuit boards, i.e. connected by flexible means
• CPC Class Codes: H05K 2201/042 Stacked spaced PCBs; Planar parts of folded flexible circuits having mounted components in between or spaced from each other

Abstract

Printed circuit assemblies comprising two or more printed circuit boards stacked and/or folded together and related methods. In some embodiments, a first printed circuit board comprising a first plurality of electrical components may be coupled with a second printed circuit board comprising a second plurality of electrical components using a flexible coupling member. The first printed circuit board may be stacked on top of the second printed circuit board and coupled using an adhesive layer positioned in between the first printed circuit board and the second printed circuit board. The adhesive layer may be configured to maintain the first printed circuit board in a stacked configuration with respect to the second printed circuit board.

Claims

1. A method for assembling a printed circuit assembly, the method comprising the steps of:

obtaining a first printed circuit board electrically coupled with a second printed circuit board along at least one flexible coupling member, wherein the first printed circuit board comprises a rigid, printed circuit board having a flexibility less than a flexibility of the flexible coupling member, wherein the second printed circuit board comprises a rigid, printed circuit board having a flexibility less than the flexibility of the flexible coupling member, wherein the first printed circuit board comprises a first plurality of electrical components, and wherein the second printed circuit board comprises a second plurality of electrical components;

applying an adhesive barrier to at least one of the first printed circuit board and the second printed circuit board;

applying a first adhesive layer to at least one of the first printed circuit board and the second printed circuit board, wherein the first adhesive layer forms a layer along each electrical component of the at least one of the first printed circuit board and the second printed circuit board, wherein the step of applying an adhesive barrier is performed before the step of applying a first adhesive layer to at least one of the first printed circuit board and the second printed circuit board, wherein the adhesive barrier defines an enclosed perimeter, and wherein the step of applying a first adhesive layer to at least one of the first printed circuit board and the second printed circuit board comprises pouring a liquid adhesive into the adhesive barrier; and

stacking the first printed circuit board relative to the second printed circuit board to form a stacked, printed circuit assembly.

2. The method of claim 1, further comprising securing the first printed circuit board and the second printed circuit board in the stacked assembly using the first adhesive layer.

3. The method of claim 2, wherein the step of securing the first printed circuit board and the second printed circuit board in the stacked assembly using the adhesive layer comprises curing the adhesive layer.

4. The method of claim 1, further comprising:

obtaining a third printed circuit board electrically coupled with the second printed circuit board, wherein the second printed circuit board is electrically coupled with both the first printed circuit board and the third printed circuit board, wherein the third printed circuit board comprises a rigid, printed circuit board having a flexibility less than a flexibility of the flexible coupling member, and wherein the third printed circuit board comprises a third plurality of electrical components;

applying a second adhesive layer to at least one of the second printed circuit board and the third printed circuit board; and

stacking the third printed circuit board relative to the first printed circuit board and the second printed circuit board to form the stacked, printed circuit assembly.

5. The method of claim 4, wherein the step of stacking the third printed circuit board relative to the first printed circuit board and the second printed circuit board comprises rolling the third printed circuit board relative to the second printed circuit board to form a first stack and rolling the first stack relative to the third printed circuit board to form a second stack made up of each of the first printed circuit board, the second printed circuit board, and the third printed circuit board such that the first printed circuit board is positioned in between the second printed circuit board and the third printed circuit board in the printed circuit assembly.

6. The method of claim 4, wherein the step of stacking the third printed circuit board relative to the first printed circuit board and the second printed circuit board comprises forming an accordion fold such that the second printed circuit board is positioned in between the first printed circuit board and the third printed circuit board in the printed circuit assembly.

7. The method of claim 1, wherein the step of stacking the first printed circuit board relative to the second printed circuit board to form a stacked, printed circuit assembly is performed without using any standoffs, connectors, or solder.

8. The method of claim 1, wherein the first adhesive layer encapsulates electrical components of the at least one of the first printed circuit board and the second printed circuit board.

9. The method of claim 8, wherein the adhesive layer is applied so as to fully encapsulate all electrical components of the at least one of the first printed circuit board and the second printed circuit board.

10. The method of claim 9, wherein the adhesive layer is applied so as to fully encapsulate each of the first plurality of electrical components and each of the second plurality of electrical components.

11. A method for assembling a printed circuit assembly, the method comprising the steps of:

obtaining a first printed circuit board electrically coupled with a second printed circuit board along at least one flexible coupling member, wherein the first printed circuit board comprises a rigid, printed circuit board having a flexibility less than a flexibility of the flexible coupling member, wherein the second printed circuit board comprises a rigid, printed circuit board having a flexibility less than the flexibility of the flexible coupling member, wherein the first printed circuit board comprises a first plurality of electrical components, and wherein the second printed circuit board comprises a second plurality of electrical components;

applying a first adhesive layer to at least one of the first printed circuit board and the second printed circuit board, wherein the first adhesive layer forms a layer along each electrical component of the at least one of the first printed circuit board and the second printed circuit board, and wherein the first adhesive layer encapsulates electrical components of the at least one of the first printed circuit board and the second printed circuit board; and

stacking the first printed circuit board relative to the second printed circuit board to form a stacked, printed circuit assembly.