Electronic watch including capacitive keys on its crystal
First Claim
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1. An electronic watch including:
- a case containing display means with hands and provided with a crystal made of dielectric material arranged in front of said hands, manual control means comprising capacitive keys each provided with at least a transparent electrode arranged on the inner face of the crystal and forming a first plate of a capacitive sensor whose second plate is formed by placing a finger of the person wearing the watch on an external face of the crystal selectively opposite at least one of said capacitive keys, said control means further including a detection device for detecting capacitance variations in said sensors and consequently generating control signals in the watch, and means for capacitive detection of position of at least one of said hands, on the basis of variations in capacitance between said hand and at least one of said transparent electrodes of the capacitive keys.
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Abstract
The watch is provided with a circular row of capacitive keys defined by transparent electrodes (21 to 32) arranged on the inner face of the crystal (5) of the watch and connected to a detection device via a multiplexer. These keys are activated by the person wearing the watch placing a finger (38) on the crystal facing one of the electrodes. The watch further includes means for detecting the position of at least one of the hands (8, 9) by means of the same detection device, using the electrodes (21 to 32) of the capacitive keys and/or other fixed electrodes (51).
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Citations
16 Claims
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1. An electronic watch including:
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a case containing display means with hands and provided with a crystal made of dielectric material arranged in front of said hands, manual control means comprising capacitive keys each provided with at least a transparent electrode arranged on the inner face of the crystal and forming a first plate of a capacitive sensor whose second plate is formed by placing a finger of the person wearing the watch on an external face of the crystal selectively opposite at least one of said capacitive keys, said control means further including a detection device for detecting capacitance variations in said sensors and consequently generating control signals in the watch, and means for capacitive detection of position of at least one of said hands, on the basis of variations in capacitance between said hand and at least one of said transparent electrodes of the capacitive keys. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic watch including:
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a case containing display means with hands and provided with a crystal made of dielectric material arranged in front of said hands, manual control means including capacitive keys each provided with at least a transparent electrode arranged on the inner face of the crystal and forming a first plate of a capacitive sensor whose second plate is formed by placing a finger of the person wearing the watch on an external face of the crystal selectively opposite at least one of said capacitive keys, said control means further including a detection device for detecting capacitance variations in said sensors and consequently generating control signals in the watch, and means for capacitive detection of position of at least one of said hands on the basis of variations in capacitance between said hand and at least one fixed electrode, said hand position detection being achieved by means of said detection device associated with the capacitive keys. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification