SHIELDED KEYBOARD Russian patent published in 2018 - IPC H05K9/00 G06F3/02 

FIELD: radio engineering and communications.

SUBSTANCE: invention relates to the field of radio engineering, in particular to the protection against information leakage through technical channels, the factor of which is secondary electromagnetic radiation. Technical result is achieved by the fact that the screened keyboard contains a housing consisting of base 1 and cover 2, planar contact membrane 3 with printed keyboard conductors embedded in housing base 1, keys 4 arranged in holes 5 of housing cover 2, elastic gasket 6 with domes, U-shaped thin conductive metal grid 7, between one and the other internal surfaces 50 of which contact diaphragm 3 is located, matrix-optical converter unit 8 is located in shielding housing 10 and comprises keyboard matrix interrogation unit 13 of matrix 14, optical signal scan code packing unit 19, optical transmitter 25, optical receiver 28, first 31 and second 32 fiber optic links, power controller 9 is located in shielding housing 10 and comprises voltage converter unit 34 and voltage monitoring and interlocking unit 35, power supply decoupling unit 11 located in secondary shielding housing 12 galvanically connected to shielding housing 10. Through the first feed-through capacitor 45, power supply decoupling circuit is connected to a power source, and through the second feed-through capacitor 48, power supply decoupling unit 11 is connected to power controller 9. Shielding housing 10 is galvanically connected to one and the other internal surfaces 50 of grid 7, and earth terminal 55 is mounted on shielding housing 10. Impedance counter reflector 57 is mounted on the housing base 1.

EFFECT: technical result is an increase in the level of shielding of magnetic and electromagnetic fields, as well as an increase in the stability of the contact membrane of the keyboard during mechanical actions of the operator's hand on the key.

21 cl, 4 dwg