Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1990-11-06
1992-11-17
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
2003022, H01H 1370
Patent
active
051645530
ABSTRACT:
A key input device including a plurality of keytops, with an elastic member being disposed between each keytop and a printed circuit board so as to be supported at a lower end portion thereof by an upper surface of the printed circuit board and pushed upwardly to cause the keytop to be biased upwardly. An engaging portion, provided on a main body of each keytop, prevents the keytop from coming out of a hole accommodating the respective keytops. The depressing stroke of the respective keytops can be defined by an upper casing an the printed circuit board regardless of the state of elastic deformation of the elastic member. An insulating substrate may be provided on the printed circuit board, with printed electrodes being formed on an upper surface of the insulating substrate in an opposed relationship to the keytops in such a manner that, when one of the keytops is depressed, the printed electrodes are brought into contact with the contact electrodes corresponding to the depressed keytop. Printed wiring conductors or strips can be formed on the upper surface of the printed circuit board on which the printed electrodes for the keytop switches are formed. The circuit elements or electronic components, connected through the printed wiring conductors or strips, can be mounted on the lower surface side of the printed circuit board resulting in a common printed circuit board for holding the keytop switches and the mounting of the electronic components.
REFERENCES:
patent: 3996429 (1976-12-01), Chu et al.
patent: 4074088 (1978-02-01), Keough et al.
patent: 4203013 (1980-05-01), Serras-Paulet
Itoh Hiromichi
Kitahara Jun
Kitazume Yoshiaki
Tsunehiro Takashi
Hitachi , Ltd.
Scott J. R.
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