Printed circuit board with layer and order of assembly identific

Details Printed circuit board with layer and order of assembly identific Printed circuit board with layer and order of assembly identific

1990-09-13

1992-03-03

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428209, 428220, 428901, 361397, 174250, 427 96, B32B 900

Patent

active

050931830

ABSTRACT:
In a method for determining the layering sequence of a plurality of layers of a multilayered member, and a multilayered member which permits such method to be performed, a relatively translucent portion is provided in each of the layers. The relatively translucent portions are superimposed on one another in the member and each is provided with at least one relatively opaque indicium which is similar in appearance to the indicia in the other layers. The indicia are arranged in the portions such that in the multilayer member, as viewed from one end of the superimposed portions, they appear to be arranged in a predetermined array. Differences in clarity in the appearance of the indicia in the array make it possible to visually confirm or not the proper layering sequence of the layers of the member. The multilayered member is preferably a printed circuit board where the indicia are arranged in a sequence in the predetermined array according to the desired layering sequence. Bars of the same shape and size can be employed as the indicia, preferably in combination with respective ones of a sequence of numbers applied to the layers according to a desired layering sequence.

REFERENCES:
patent: Re28506 (1975-08-01), Quaintance et al.
patent: 3272909 (1966-09-01), Bruck et al.
patent: 3765994 (1973-10-01), Quaintance et al.
patent: 4706167 (1987-11-01), Sullivan

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