Browse Prior Art Database

Alternate Pinned Lay-Up Orientation

IP.com Disclosure Number: IPCOM000037080D
Original Publication Date: 1989-Nov-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Wilhite, DW: AUTHOR

Abstract

Pinned artwork lay-ups require several lower level part numbers to produce product. A method is described which reduces the required part number set and the associated cycle time, and photo lab support.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 81% of the total text.

Page 1 of 2

Alternate Pinned Lay-Up Orientation

Pinned artwork lay-ups require several lower level part numbers to produce product. A method is described which reduces the required part number set and the associated cycle time, and photo lab support.

Current processes for pinned artwork lay-ups for large form factor printed circuit boards involve two part numbers for the lower levels. If one of the "matched" sets is delayed, then the entire order is delayed. The new method produces both sets on one piece.

The method requires the following assumptions. The panel lay-out must be symmetrical around center line; i.e., there must be an even number of pieces per panel, as shown in Fig. 1.

The Lay-up must be symmetrical around the center of the cross- section, i.e., even number of planes only, as shown in Fig. 2.

The registration system for all photo processes must be symmetrical around the center line, as shown in Fig. 3.

(Image Omitted)

The method requires placing two different artworks on one plane of circuitry and mating together to produce the final product.

The current process places separate artwork on planes of circuitry, and mating separate parts to produce the final product. Fig. 3 illustrates a comparison of the current process and the new method. The advantages are as follows:

Reduced artwork support:

The current process has six artworks - A, B, C, D, E1,

E2 each with two images (A-A, B-B, C-C, etc.).

The new process has three artworks - A-D, B-C and E1 - E2

Reduced pro...