EP 0001882 B1 19811209 - DEPRESSIBLE CONTACTLESS KEY FOR GENERATING ELECTRIC SIGNALS IN AN ELECTRONIC KEYBOARD
Title (en)
DEPRESSIBLE CONTACTLESS KEY FOR GENERATING ELECTRIC SIGNALS IN AN ELECTRONIC KEYBOARD
Publication
Application
Priority
IT 6948677 A 19771107
Abstract (en)
[origin: EP0001882A1] An elastomeric material conductive under pressure is suitable for use in a keyboard. When not compressed the material is insulating. When a key (21) is depressed, the pressure renders the material (11) conductive and completes a circuit (14, 11, 16, 17, 15). In order to prolong the life of the material when it is repeatedly compressed, a magnetic field is used during polymerization of an elastomer in which magnetic powder is dispersed. The material becomes piezoconductive in a preferred direction parallel to the applied field.
IPC 1-7
IPC 8 full level
H01C 10/10 (2006.01); H01H 13/702 (2006.01); H01H 13/785 (2006.01)
CPC (source: EP)
H01C 10/106 (2013.01); H01H 13/702 (2013.01); H01H 13/785 (2013.01); H01H 2201/036 (2013.01); H01H 2207/008 (2013.01); H01H 2227/012 (2013.01); H01H 2227/014 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0001882 A1 19790516; EP 0001882 B1 19811209; DE 2861435 D1 19820204; IT 1091947 B 19850706
DOCDB simple family (application)
EP 78300393 A 19780918; DE 2861435 T 19780918; IT 6948677 A 19771107