Back to results
US 4,127,740 AGranted
Routing arrangement for ground conductors in printed circuit structures
AssigneeSheldahl, Inc.
InventorFrederick W. LaMarche
Life of this patent
Estimating the term…
Abstract
A universal printed circuit pattern of conductors for use in connection with diaphragm-type push button electrical switch panels which allows the printed circuit board to be physically sheared along plural axes to accommodate switch panels of varying sizes without destroying electrical continuity of the ground or common conductor thereon.
Claims5
A printed circuit board for use in diaphragm-type electrical switch panels comprising:
- (a) an insulating substrate having formed thereon at predetermined coordinate locations of rows and columns on a first area a pattern of first and second sets of conductive fingers, the fingers in each set being conductively connected one with the other in that set and interleaved in a noncontact relationship with the fingers on the other set, said substrate having a second area terminating at a single edge along which plural terminal positions are established;
- and
- (b) conductor means formed on said insulating substrate connecting said first and said second sets of conductive fingers at each of said predetermined coordinate locations to said plural terminal positions, the conductor means being routed on said first area such that severing of said substrate along plural axes between said rows and columns in said first area does not destroy the continuity of said conductor means connecting the remaining ones of said first and second sets of conductive fingers to said plural terminal positions following such severing.
A method for manufacturing printed circuit boards for use in diaphragm-type push button electrical switch panels comprising the steps of:
- (a) forming first and second conductive contact areas at a plurality of coordinate locations aligned in rows and columns on the surface of an insulating substrate;
- (b) forming a plurality of conductive terminal points at one edge of said substrate;
- (c) forming a plurality of conductors on said substrate, at least one conductor being connected to said first conductive contact area at each of said plurality of coordinate locations, the remaining conductors individually linking the second conductive contact area at each of said plurality of coordinate locations to one of said conductive terminal areas;
- and
- (d) cutting said substrate along one or more axes between said rows or columns without shearing said plurality of conductors associated with those first and second contact areas at the coordinate locations remaining after said cutting step.
2 more elements
Dependencies are inferred from the claim text.