Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1989-02-23
1989-10-24
Scott, J. R.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
200600, 200 5A, 341 33, H03K 17975, H01H 3500
Patent
active
048764612
ABSTRACT:
In a capacitive switchcore of the type in which each key cell includes a contact switch in series with a key cell capacitor, an improvement is disclosed in which an intracell coactive loading capacitor is added to each key cell. The intracell coactive loading capacitor is connected between ground and the junction of the contact switch with the key cell capacitor. A matrix of key cells so formed is self-referencing, in that the need for a separate reference capacitor to load the sense line is eliminated. Instead, loading is provided intrinsically by the effect of the intracell coactive loading capacitors acting through multiple key cells connected to a sense line. A preferred embodiment in a capacitive membrane switchcore is described.
REFERENCES:
patent: 3996430 (1976-12-01), Eberwein et al.
patent: 4233522 (1980-11-01), Grummer et al.
patent: 4243861 (1981-01-01), Strandwitz
patent: 4373122 (1983-02-01), Frame
patent: 4373124 (1983-02-01), Frame
patent: 4614937 (1986-09-01), Poujois
patent: 4818827 (1989-04-01), Ipcinski et al.
Scott J. R.
W. H. Brady Co.
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