Apparatus for laminating multilayered printed circuit boards having both rigid and flexible portions

• US 4,986,870 A
• Filed: 09/27/1985
• Issued: 01/22/1991
• Est. Priority Date: 03/09/1984
• Status: Expired due to Fees

• Current Assignee: RWQ Incorporated
• Original Assignee: RWQ Incorporated
• Inventors: Frohlich, Sigurd
• Primary Examiner(s): Cashion, Jr., Merrell C.
• Application Number:
  US06/781,313
• Time in Patent Office: 1,943 Days
• Field of Search: 156/87, 156/381-382, 156/384, 156/580-581, 156/583.3, 156/583.8, 156/285-286, 156/629-630, 156/288, 156/560-561
• US Class Current: 156/382
• CPC Class Codes: H05K 2203/068 Features of the lamination press or of the lamination process, e.g. using special separator sheets
• CPC Class Codes: H05K 2203/085 Using vacuum or low pressure
• CPC Class Codes: H05K 3/4611 by laminating two or more circuit boards H05K3/4652 takes precedence
• CPC Class Codes: H05K 3/4691 Rigid-flexible multilayer circuits comprising rigid and flexible layers, e.g. having in the bending regions only flexible layers

Abstract

A method and apparatus for laminating multilayer printed circuit boards having both rigid and flexible portions. The multilayers of a multilayer printed circuit board are positioned on a lower lamination plate which rests on a bleeder plate which itself rests on a vacuum plate. The circuit layers are then covered with another steel plate, a sheet of silicon material, a breather blanket and a plastic vacuum bag which is hermetically sealed to the vacuum plate using a silicon sealing material. The vacuum plate and the components thereon are positioned within a pressure vessel, a vacuum line is connected to the vacuum plate and the multiple layers of the multilayer printed circuit board are laminated within the pressure vessel.

Claims

1. A portable module for laminating multilayers of a multilayer printed circuit board comprising:

a vacuum plate having a vacuum port and a vacuum line connector on one side thereof;

bleeder plate means positioned on the other side of said vacuum plate for providing multiple channels for air flow to uniformly from said vacuum port to the perimeter of said means;

a lower lamination plate positioned on said bleeder plate means, the multilayers of said printed circuit board being adapted to be positioned on said lower lamination plate;

a blanket of porous material covering said printed circuit board, said lower lamination plate and said bleeder plate means; and

a vacuum bag covering said blanket of porous material and hermetically sealed to said vacuum plate, said blanket and said vacuum bag conformable to the shape of the printed circuit board, the lower lamination plate and said bleeder plate means.

2. The module of claim 1 wherein the bleeder plate means comprises:

a rigid plate having a smooth upper surface for receipt of said lower lamination plate and a series of intersecting grooves in the lower surface thereof which extends to the periphery thereof to provide channels for air to flow uniformly from said printed circuit board to said vacuum port.

3. The module of claim 1, further comprising:

an upper lamination plate positioned on said multilayers of the printed circuit board; and

a sheet of rubber-like material positioned above said upper lamination plate, said blanket of porous material covering said sheet of rubber-like material.

4. An apparatus for laminating multilayer printed circuit boards comprising:

at least one portable lamination module, said module comprising;

a. a vacuum plate having a vacuum port and a vacuum line connector on one side thereof;

b. bleeder plate means positioned on the other side of said vacuum plate for providing multiple channels for air to flow uniformly from said vacuum port to the perimeter of said means;

c. a lower lamination plate positioned on said bleeder plate means, the multilayers of said printed circuit board being adapted to be positioned on said lower lamination plate;

d. a blanket of porous material covering said printed circuit board, said lower lamination plate and said bleeder plate means; and

e. a vacuum bag covering said blanket of porous material and hermetically sealed to said vacuum plate, said blanket and said vacuum bag conformable to the shape of the printed circuit board, the lower lamination plate and said bleeder plate means; and

a pressure vessel adapted for receiving each such portable lamination module, said pressure vessel comprising a plurality of vacuum lines, each of said vacuum lines being adapted for connection to a vacuum line connector of one of said lamination modules.

5. The apparatus of claim 4, wherein the bleeder plate means comprises:

a rigid plate having a smooth upper surface for receipt of said lower lamination plate and a series of intersecting grooves in the lower surface thereof which extends to the periphery thereof to provide channels for air to flow uniformly from said printed circuit board to said vacuum port.

6. The apparatus of claim 4, wherein the module further comprises:

f. an upper lamination plate positioned on said multilayers of the printed circuit board; and

g. a sheet of rubber-like material positioned above said upper lamination plate, said blanket of porous material covering said sheet of rubber-like material.