Pressure-operated layered electrical switch and switch array

申请号 US3617666D 申请日 1970-04-30 公开(公告)号 US3617666A 公开(公告)日 1971-11-02
申请人 DATA APPLIANCE CORP; 发明人 BRAUE CHARLES E;
摘要 A pressure-operated electrical switch unit having a layered construction including a substantially planar surface to which pressure is applied to close the switch. The removal of the pressure opens the switch. The switch includes a layer having at least one elongated opening in it which permits portions of the layer to be deflected into an opening in an adjacent layer to move one electrically conductive layer to complete the electrical circuit. An array of the switches may be used for supplying signals created by the pressure of a writing instrument.
权利要求
1. An electrical switch which is closed by the application of pressure against an area of the switch and is opened when the pressure is removed comprising a. an electrically nonconductive base; b. a first electrically conductive layer positioned against such base; c. a nonconductive separator means placed against the side of the conductive layer opposite the base, said separator means having an opening therein; d. a second electrically conductive layer placed against the side of the separator means opposite the first conductive layer; e. a layer of nonconductive noncompressible material placed against the side of the second electrically conductive layer opposite the nonconductive layer means, said noncompressible layer having an elongated opening positioned adjacent the opening in the separator means; and f. a pressure-responsive deflectable portion of the noncompressible layer positioned adjacent the opening capable of being deflected down into said opening whereby the application of pressure transmitted to and against the pressure-responsive deflectable portion causes said portion to move a portion of the second conductive layer against the first conductive layer to close the switch.
2. The switch of claim 1 in which the conductive layers are fabrics having electrically conductive material coated thereon.
3. The switch of claim 1 in which the pressure-responsive deflectable portion of the noncompressible layer includes a plurality of lip means adjacent an elongated opening in said noncompressible layer which lip means are capable of being deflected down into said opening in the separator means.
4. The switch of claim 1 having a sheet positioned in engagement with the noncompressible layers for receiving applied pressure which is in turn transmitted to said noncompressible layer.
5. An array of pressure-operated electrical switches arranged in a unit comprising a. an electrically nonconductive baseplate forming the base of the switches, b. a fabric layer positioned on the baseplate and having electrically conductive portions, c. a nonconductive separator layer placed against the side of the fabric opposite the plate, said separator having a plurality of openings therein, d. a second fabric layer having electrically conductive portions and electrically nonConductive portions positioned on the separator layer, and e. a nonconductive noncompressible deflection sheet placed on the second layer, said sheet having deflectable portions in alignment with said openings in the separator layer to permit the deflectable portions to be deflected against the second layer of fabric, said layer having slits therein.
6. The array of claim 5 in having in addition a protective sheet positioned on the noncompressible deflection sheet on which pressure is directly applied.
7. The array of claim 5 in which layers having conductive and nonconductive portions are nylon fabric in which the conductive portions includes woven fibers coated with silver metal.
8. The switch of claim 1 in which the base and the first electrically conductive layer comprise a nonconductive sheet material having selected areas of conductive material adhered to the sheet material.
9. The array of claim 5 in which the base and the first electrically conductive layer comprise a nonconductive sheet material having selected areas of conductive material adhered to the sheet material.
10. The array of claim 5 having positioned thereon a sheet of material having delineated areas which indicate where pressure may be effectively applied.
11. An array of claim 5 capable of responding to the application of pressure of a writing instrument and having positioned thereon a sheet of material having delineated areas indicating where pressure may be effectively applied by such instrument.
12. The array of claim 11 in which the sheet is capable of recording marks made by such instrument.
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