Electricity: circuit makers and breakers – Multiple circuit control – Reciprocating contact
Patent
1990-08-15
1991-09-17
Scott, J. R.
Electricity: circuit makers and breakers
Multiple circuit control
Reciprocating contact
200305, H01H 1500
Patent
active
050497073
ABSTRACT:
A switching device for super high frequency ranges comprising a common fixed contact and a pair of selectable fixed contacts, and moveble contacts which are slidable over them so as to selectively and electrically connect the common fixed contact to one of the selectable fixed contacts. A pair of buffer electrodes are placed between the common fixed contact and the selectable fixed contacts to reduce the electrostatic capacitance between the fixed contacts and reduce signal attenuation in super high frequency ranges. The buffer electrodes are electrically isolated without being connected to any external circuit and thereby reduce electrical capacitance produced between the common fixed contact and the selectable fixed contacts without creating excessive gaps therebetween. Such gaps would prevent smooth sliding movement of the moveable contacts. To promote smooth sliding moveable of the moveable contacts, the buffer contact may have the shape of a chevron while the corresponding edges of the fixed contacts are provided with complementary concave and convex shapes so as to minimize the maximum width of the gaps therebetween. Optionally, each of the buffer electrodes may be provided with slits extending in the direction of the movement of the movable contacts to further reduce the electrostatic capacitance between the fixed contacts. This switching device is suitable for use in switching over delay lines in a digital variable delay line.
REFERENCES:
patent: 4052573 (1977-10-01), Kojima et al.
patent: 4185176 (1980-01-01), Matsuo
patent: 4507627 (1985-03-01), Ito et al.
Elmec Corporation
Scott J. R.
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