Keyboard spill-proofing mechanism

Details Keyboard spill-proofing mechanism Keyboard spill-proofing mechanism

2006-04-18

2006-04-18

Friedhofer, Michael (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Cases and bases

C200S314000

Reexamination Certificate

active

07030330

ABSTRACT:
This keyboard spill-proofing mechanism reduces and prevents damage to the electronic circuitry in keyboard that would normally occur due to inadvertent spillages of liquids, such as water, coffee or soda, onto the keyboard. This keyboard spill-proofing mechanism features a membrane sheet positioned below the top case. The membrane sheet includes multiple layers that have electrical circuits. The electrical circuits detect the off/on state of the key caps when they are pressed. The keyboard design features a waterproof base sheet made of an adhesive material that is positioned between the top case and the membrane sheet. The waterproof base sheet is designed such that a plurality of rubber springs connected thereon transmit the off/on state of the key caps to the electrical circuits in the membrane sheet. The waterproof base sheet is also designed so that it has multiple blocking portions which project upward from the waterproof base sheet so as to prevent spilled liquid from flowing downward onto the membrane sheet thereby preventing or reducing possible damage to the electrical circuits in the membrane sheet of the keyboard.

REFERENCES:
patent: 6054939 (2000-04-01), Wei et al.
patent: 6156983 (2000-12-01), Chen et al.
patent: 6444928 (2002-09-01), Okamoto et al.
patent: 6688790 (2004-02-01), Ito
patent: 6690360 (2004-02-01), Johnston et al.
patent: 6717083 (2004-04-01), Chen et al.

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