Browse Prior Art Database

Electric Inspection System for Flex Circuits

IP.com Disclosure Number: IPCOM000051988D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Rude, DL: AUTHOR [+2]

Abstract

An automatic measurement of the center-to-center spacing of the conduct on the extremities or terminal pads of a flat cable flexible circuit operates as follows. An insulated board has a test pattern comprising a series of conducting line segments of decreasing length placed on opposite sides of the nominal center line location of the extremities of pads shown in dotted form as 11 and 13, respectively. Each terminal pad has two sets of associated line segments, alternate conductors of which are labeled 1 through 6, designating conductors on the right and left side of the pad reference lines 16 and 18, respectively. The individual line segment groups are terminated in registers labeled 15, 17, 19 and 21.

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Electric Inspection System for Flex Circuits

An automatic measurement of the center-to-center spacing of the conduct on the extremities or terminal pads of a flat cable flexible circuit operates as follows. An insulated board has a test pattern comprising a series of conducting line segments of decreasing length placed on opposite sides of the nominal center line location of the extremities of pads shown in dotted form as 11 and 13, respectively. Each terminal pad has two sets of associated line segments, alternate conductors of which are labeled 1 through 6, designating conductors on the right and left side of the pad reference lines 16 and 18, respectively. The individual line segment groups are terminated in registers labeled 15, 17, 19 and
21. The endpoint of each conductor within these registers is separated by a distance designated delta further from the reference line than the adjacent conductor, and each conductor is assigned a number indicative of its endpoint distance from its reference line. In the illustrated embodiment, delta defines a distance of 1 mil. However, in practice, delta can be any specified distance and need not be a constant.

The distance between the zero and Y reference lines 16 and 18, respectively, corresponds to the specified distance between the centers of the flex circuit. The number of external lines, twelve in the illustrated embodiment, is determined by the desired accuracy and resolution, i.e., the smaller the delta increment, the higher the accuracy.

Measurements of the center spacing of the terminal pads 11, 13 can be provided in the same time...