Membrane switchcores with high resisitivity ink circuits

Details Membrane switchcores with high resisitivity ink circuits Membrane switchcores with high resisitivity ink circuits

1988-10-25

1990-04-24

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 33, 200 5A, 200600, 200292, H03M 1100

Patent

active

049203428

ABSTRACT:
A decodable alphanumeric membrane switchcore (12, 12a, 12b,100) of at least 36 key cells (55,122) including spaced circuits (16,17;105,115) having row and column traces (20-34, 40-47,51;106,116) and key cell elements (37,38,49;80;107,117) printed with ink having a resisitivity of at least about 10 ohms per square per 0.001" of ink thickness and having at least one path defined by a row trace, column trace and a key cell that has a resistance greater than 10,000 ohms.

REFERENCES:
patent: 4633228 (1986-12-01), Larson
patent: 4803315 (1989-02-01), Kako et al.
patent: 4857684 (1989-08-01), Gratke

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