Switch arrangement
First Claim
1. A switch arrangement comprising:
- a plurality of switches arranged on a substrate, each switch comprising a resiliently deformable conductive dome for making an electrical connection with a corresponding contact on the substrate;
and a plurality of signal lines for connection to a microprocessor for signaling an operation of a switch, wherein the switches are arranged such that operation of any given switch creates a unique electrical connection between two of the plurality of signal lines and each of the plurality of signal lines is electrically connected to a conductive surface of a respective dome.
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0 Petitions
Accused Products
Abstract
A switch arrangement is disclosed. The arrangement comprises a number of switches arranged on a substrate, each switch having a resiliently deformable conductive dome for making an electrical connection with a corresponding contact on the substrate; and a number of signal lines for connection to a microprocessor for signalling an operation of a switch. The switches are arranged such that operation of any given switch creates a unique electrical connection between two of the signal lines and each of the signal lines is electrically connected to a conductive surface of a respective dome. Also disclosed is a cover for a portable electronic apparatus, having a number of user operable keys. The keys are connectable to a microprocessor in the apparatus via electrical connections made using the conductive domes.
7 Citations
17 Claims
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1. A switch arrangement comprising:
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a plurality of switches arranged on a substrate, each switch comprising a resiliently deformable conductive dome for making an electrical connection with a corresponding contact on the substrate;
and a plurality of signal lines for connection to a microprocessor for signaling an operation of a switch, wherein the switches are arranged such that operation of any given switch creates a unique electrical connection between two of the plurality of signal lines and each of the plurality of signal lines is electrically connected to a conductive surface of a respective dome.
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2. A cover, for attachment to an electronic apparatus having a plurality of key domes disposed in a predetermined pattern, the cover comprising:
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plurality of contacts positioned for registration with conductive key domes of the electronic apparatus;
discontinuous electrical pathways between respective ones of the plurality of contacts; and
a plurality of user accessible keys arranged such that actuation of respective ones of the plurality of keys completes the electrical pathway between respective pairs of the plurality of contacts. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A portable radio telephone comprising:
- a body portion having a plurality of switches, each switch comprising a resiliently deformable conductive dome; and
a removable cover comprising means for attachment to the body portion and for co-operation with the domes and comprising a plurality of user operable keys, wherein the relative positions of the keys on the cover are independent of the relative positions of the domes. - View Dependent Claims (15)
- a body portion having a plurality of switches, each switch comprising a resiliently deformable conductive dome; and
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16. A detector for detecting actuation of one of a plurality of switches, each switch being arranged to create a unique electrical connection between two of a plurality of signal lines, wherein the detector is arranged to:
- apply a known signal to each one of the plurality of signal lines in turn; and
monitor the remaining ones of the plurality of signal lines for the presence of the known signal. - View Dependent Claims (17)
- apply a known signal to each one of the plurality of signal lines in turn; and
Specification