Intrusion detection security keyboard

Details Intrusion detection security keyboard Intrusion detection security keyboard

1997-01-10

1999-02-16

Shankar, Vijay

Computer graphics processing and selective visual display system

Display peripheral interface input device

Including keyboard

345170, 345172, G09G 500

Patent

active

058725601

ABSTRACT:
A security keyboard is disclosed with a contacting circuit board, a plurality of keys and a switching foil, where the contacting circuit board comprises contact elements necessary for the security keyboard and which is substantially completely enveloped in a security film and in operating the plurality of keys the keyboard pressure is transmitted through the security film to the contacts of the contacting circuit board. In accordance with the invention, the plurality of keys are held in the switching foil in such a way that on operating the plurality of keys a tactile feedback is produced. This permits a positive switching of the security keyboard since, because of the tactile feedback, an `automatic` backpressure of the keys results through a force inflection point, after which an operating force necessary for the operation of the keys, increases again as a consequence, in part, of the security film lying between the key and the contacting means of the security keyboard.

REFERENCES:
patent: 4017700 (1977-04-01), West
patent: 4034177 (1977-07-01), Sims, Jr.
patent: 4962530 (1990-10-01), Cairns
patent: 5057657 (1991-10-01), Skulic
patent: 5228561 (1993-07-01), Schroeder
patent: 5717565 (1998-02-01), Raasch

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