Postage meter having shielded keyboard to protect against electr

Details Postage meter having shielded keyboard to protect against electr Postage meter having shielded keyboard to protect against electr

1980-02-19

1982-06-22

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

200 5A, 235101, 361416, G06F 302, G07G 100

Patent

active

043365299

ABSTRACT:
A shielded switch structure is disclosed. The switch structure is adapted for use in a system which is susceptible to being affected by electromagnetic radiation. The structure includes a conductive flexible sheet disposed adjacent to a plurality of switch contacts. The sheet is operable to enable a force applied to the sheet to actuate selected switch contacts. The shielded switch structure is mounted on a postage meter conductive housing. The housing includes a recessed area adapted to receive the keyboard. The conductive flexible sheet is positioned above the conductive housing recessed area and of a size so that the margins of the flexible sheet physically engage non recessed areas of the housing.

REFERENCES:
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patent: 3701958 (1972-10-01), Jaag
patent: 3898421 (1975-08-01), Suammura
patent: 3938095 (1976-02-01), Check et al.
patent: 3978457 (1976-08-01), Check et al.
patent: 3988551 (1976-10-01), Larson
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patent: 4035794 (1977-07-01), Norton et al.
patent: 4078257 (1978-03-01), Bagley
patent: 4081898 (1978-04-01), Taylor et al.
patent: 4085302 (1978-04-01), Zonk et al.
patent: 4085306 (1978-04-01), Dunlap
patent: 4090045 (1978-05-01), Marsh
patent: 4096364 (1978-06-01), Lynn et al.
Technical Bulletin, Molex, "10900 Series Membrane Switch".

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