Proximity switch having differential contact surface
First Claim
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1. A proximity switch comprising:
- a proximity sensor generating a signal;
a contact surface proximate to the proximity sensor and comprising a differential elevation change feature; and
control circuitry processing the signal to detect a first substantially stable state of the signal, followed by a differential increase in the signal indicative of a press by a user on the contact surface, followed by a second substantially stable state of the signal, wherein the control circuitry detects activation of the switch based on the detected first substantially stable state followed by the differential increase exceeding a differential threshold and the following second substantially stable state.
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Abstract
A proximity switch assembly and method for activating a proximity switch is provided. The assembly includes a proximity sensor generating a signal, and a contact surface proximate to the proximity sensor and having a differential elevation change feature. The proximity switch also includes control circuitry processing the signal to detect a differential increase in the activation signal indicative of a hard press on the contact surface. The control circuitry detects activation of the switch based on the differential increase exceeding a differential threshold. Activation can further be determined based on a stable signal.
496 Citations
20 Claims
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1. A proximity switch comprising:
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a proximity sensor generating a signal; a contact surface proximate to the proximity sensor and comprising a differential elevation change feature; and control circuitry processing the signal to detect a first substantially stable state of the signal, followed by a differential increase in the signal indicative of a press by a user on the contact surface, followed by a second substantially stable state of the signal, wherein the control circuitry detects activation of the switch based on the detected first substantially stable state followed by the differential increase exceeding a differential threshold and the following second substantially stable state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of activating a proximity switch comprising:
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providing a proximity sensor generating a signal; providing a contact surface having a differential elevation change feature proximate to the proximity sensor; processing the signal to detect a first substantially stable state of the signal, followed by a differential increase in the signal indicative of a press by a user on the contact surface, followed by a second substantially stable state of the signal; and detecting activation of the switch based on the first and second substantially stable states and the differential increase exceeding a differential threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A proximity switch comprising:
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a proximity sensor generating a signal; a contact surface proximate to the proximity sensor and comprising a differential elevation change feature; and control circuitry detecting a first substantially stable state of the signal, followed by a differential increase in the signal exceeding a differential threshold, followed by a second substantially stable state of the signal, and determining activation of the switch based thereon.
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Specification