Capacitive transducer
First Claim
1. A capacitive transducer comprising at least two plate electrodes aligned along a main axis in spaced juxtaposed relation, a substantially parallel array of segmented electrodes each of smaller dimensional width than said plate electrodes and aligned in a direction transverse to said main axis overly said plate electrodes but separated therefrom by dielectric means, said segmented electrodes capacitively coupled to said plate electrodes in an increasing capacitive and monotonic manner from one end of the transducer to the other along said main axis.
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Abstract
A capacitive transducer comprises two plate electrodes positioned in juxtaposed relationship on one surface of a dielectric substrate and an array of segmented electrodes provided on the opposite side of the substrate. Capacitive coupling is achieved between the segmented electrode array and the two plate electrodes. The geometrics of the transducer are such that increasing capacitive coupling is obtained along the main axis of the transducer. An AC signal supplied to one of the plate electrodes of the transducer can be attenuated by physically touching the segmented electrode array. Attenuation can be varied by moving such physical contact along the main axis of the transducer. One or more transducer can be used in a coordinate arrangement to provide an X-Y position indicating device.
113 Citations
20 Claims
- 1. A capacitive transducer comprising at least two plate electrodes aligned along a main axis in spaced juxtaposed relation, a substantially parallel array of segmented electrodes each of smaller dimensional width than said plate electrodes and aligned in a direction transverse to said main axis overly said plate electrodes but separated therefrom by dielectric means, said segmented electrodes capacitively coupled to said plate electrodes in an increasing capacitive and monotonic manner from one end of the transducer to the other along said main axis.
- 16. A capacitive transducer for varying the amplitude of an input signal comprising a pair of tapered conductive plate electrodes in a juxtaposed relation, a signal source connected to one of said plate electrodes to provide an input signal, a detection means connected to the other of said plate electrodes, an array of segmented conductive electrodes each of smaller dimensional width than said plate electrodes and in substantially parallel alignment positioned over both of said plates and separated therefrom by a dielectric layer, each of said segment electrodes being capacitively coupled to both of said plate.
Specification