Circuit board with contact positions, as used for telecommunicat

Details Circuit board with contact positions, as used for telecommunicat Circuit board with contact positions, as used for telecommunicat

1985-10-07

1987-03-03

Scott, J. R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200292, H01H 900, H01H 1370

Patent

active

046477292

ABSTRACT:
A circuit pattern on a circuit board, as used in telecommunications systems and other electrical apparatus, often has contact positions for switches, such as pushbutton switches, and for other purposes. The normal copper circuit pattern is covered at the contact positions to give improved contact conditions. Carbon ink has been proposed by obtaining the necessary high level of alignment of carbon ink with the copper pattern at contact positions is difficult as such contact positions have very close members. The invention proposes contact positions having closely spaced inter-digital contact members, in which the circuit pattern extends to and stops at the peripheral region of a contact position, the contact members being of carbon ink and overlapping conductors of the circuit pattern at the peripheral region.

REFERENCES:
patent: 3504098 (1970-03-01), Clark
patent: 3760137 (1973-09-01), Shimojo et al.
patent: 3860771 (1975-01-01), Lynn et al.
patent: 4045636 (1977-08-01), Yoder et al.
patent: 4296272 (1981-10-01), Schelhorn
patent: 4328399 (1982-05-01), Perks et al.
patent: 4423294 (1983-12-01), Walser et al.
patent: 4451714 (1984-05-01), Eventoff
patent: 4527021 (1985-07-01), Morikawa et al.

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