Contact-free push-button key for generating an electrical signal upon depression thereof
First Claim
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1. A depressible key for generating an electric signal identifying whether the key is in a depressed or non-depressed state comprising:
- a deformable continuous toroidal tape core;
a means for applying pressure for deforming said core;
at least one electrically conductive winding extending through said core in which winding said electric signal is generated upon deformation of said core; and
a means for limiting deformation of said core such that after an initial deformation said core presses against said limiting means and requires a discontinuous change in said pressure for further deformation of said core.
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Abstract
A contact-free push-button key for converting mechanical energy into an electrical signal has a toroidal tape core comprised of material having a low magnetic retentivity such as an amorphous metal alloy, the toroidal tape core having an electrical winding thereabout and being deformable upon actuation of a key button thereby inducing a voltage change in the associated winding as a result of the changing magnetic characteristics during deformation. The deformable toroidal core is contained in a housing covered by a slidable push-button key which deforms the core when pressed.
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Citations
13 Claims
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1. A depressible key for generating an electric signal identifying whether the key is in a depressed or non-depressed state comprising:
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a deformable continuous toroidal tape core; a means for applying pressure for deforming said core; at least one electrically conductive winding extending through said core in which winding said electric signal is generated upon deformation of said core; and a means for limiting deformation of said core such that after an initial deformation said core presses against said limiting means and requires a discontinuous change in said pressure for further deformation of said core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification