Multi-layer backpanel including metal plate ground and voltage p

Details Multi-layer backpanel including metal plate ground and voltage p Multi-layer backpanel including metal plate ground and voltage p

1975-06-06

1977-10-18

Smith, Jr., David

Electricity: electrical systems and devices

Miscellaneous

29625, H02B 102

Patent

active

040549399

ABSTRACT:
A metal voltage plate is drilled or punched first with alignment holes, placed upon a jig and drilled with contact clearance holes in preselected locations. A metal ground plate is also drilled or punched first with alignment holes, placed upon a jig and drilled with contact clearance holes in preselected locations. The clearance holes are preferably in the range of 80-90 mils in diameter and located in positions where contacts are to pass through a plate without making electrical connection therewith. Next, both the voltage and ground plates are coated, including the inner walls of the clearance holes, with a relatively thick layer of an insulative dielectric material, such as teflon, polyurethane, p.v.c., or the like. The coated voltage plate is then drilled or punched with an array of smaller connecting holes, on the order of 40 mils in diameter, through which contacts to be electrically connected with voltage will be pressed. Since the connecting holes are made after the plate has been coated with a dielectric, the insides of the connecting holes will comprise bare metal and, hence, make good electrical connection with a contact portion press fitted therein. The coated ground plate is similarly drilled or punched with an array of smaller connecting holes, also on the order of 40 mils in diameter, through which contacts to be electrically connected with ground potential will be pressed. Each connecting hole in the ground plate is in a different location, with respect to the alignment holes, than each connecting hole in the voltage plate.
A pair of double-sided, glass-filled, epoxy resin printed circuit boards, with alignment holes corresponding to those in the metal plates, are placed one above and one below the pair of adjacent metal plates. The printed circuit boards include plated-through holes in each location where a contact is to be fitted and each corresponds to a connecting hole in either the ground or voltage plate or a clearance hole in either or both. When a contact is press fitted down through the axially aligned holes in the stacked layers, frictional engagement of the contacts with the plated walls of the holes in the top and the bottom printed circuit boards, as well as the connecting holes in the metal plates, mechanically joins the layers into a single unitary structure and electrically interconnects each point which is in interfering engagement with the contact.

REFERENCES:
patent: 3334395 (1967-08-01), Cook et al.
patent: 3354542 (1967-11-01), Mallia
patent: 3509268 (1970-04-01), Schwartz et al.
patent: 3514538 (1970-05-01), Chadwick et al.
patent: 3660726 (1972-05-01), Ammon et al.
patent: 3663866 (1972-05-01), Iosue et al.
patent: 3932932 (1976-01-01), Goodman

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