Electricity: circuit makers and breakers – Multiple circuit control – Multiple switch
Patent
1975-01-10
1976-11-30
Scott, James R.
Electricity: circuit makers and breakers
Multiple circuit control
Multiple switch
200159B, 200302, 200306, H01H 1352, H01H 160
Patent
active
039951286
ABSTRACT:
A keyboard system for an electronic pocket calculator or the like comprising an insulative substrate board having a plurality of recesses formed therein and a plurality of switch actuating elements (e.g., disks), one for each recess. The board is provided with switch contacts at each of the recesses including an outer contact on one face of the board bordering each of the recesses and an inner contact within each recess and terminals at a margin of the board for electrical interconnection to other electronic components. Each of the disks is resiliently deformable between an initial position in which its outer margin is in contact with the outer contact and in which it is clear of the inner contact and an actuated position in which the outer margin of the disk remains in contact with the outer contact and in which one point of the disk is in contact with the inner contact thereby to complete a circuit between the inner and outer contacts. A sheet of flexible insulative material is adhesively bonded to the one face of the board and to the outer faces of the disks for securing the disks in position relative to their respective recesses, for permitting the disks to be deformed to their actuated positions, and for sealing the disks to the board. An alternative embodiment includes a vent for each recess to enhance tactile feedback.
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Baumann Russell E.
Haug John A.
McAndrews James P.
Scott James R.
Texas Instruments Incorporated
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