Proximity switch, a target, a system of such proximity switches and targets, and a method of determining the presence of a target by a proximity switch
First Claim
Patent Images
1. A proximity switch for detecting a target in proximity with the proximity switch, comprising:
- a wireless transmitter for transmitting a first pulsed signal having the first carrier frequency to the target, a wireless receiver for receiving a second pulsed signal generated by a target transmitter having a second carrier frequency different from the first carrier frequency, and a controller for providing an output indicative of whether a predetermined correspondence is satisfied between the first and the second pulsed signals.
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Accused Products
Abstract
A proximity switch for detecting a target in proximity with the proximity switch as a wireless transmitter for transmitting a first pulsed signal having a first carrier frequency to the target. The proximity switch also includes a wireless receiver for receiving a second pulsed signal having a second carrier frequency different from the first carrier frequency from the target. The proximity switch has a controller for providing an output indicative of whether a predetermined correspondence is satisfied between the first and second pulsed signals.
46 Citations
16 Claims
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1. A proximity switch for detecting a target in proximity with the proximity switch, comprising:
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a wireless transmitter for transmitting a first pulsed signal having the first carrier frequency to the target, a wireless receiver for receiving a second pulsed signal generated by a target transmitter having a second carrier frequency different from the first carrier frequency, and a controller for providing an output indicative of whether a predetermined correspondence is satisfied between the first and the second pulsed signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A target for use in combination with a proximity switch, comprising:
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a wireless receiver for receiving a first pulsed signal having a first carrier frequency from the proximity switch, and a wireless transmitter for transmitting a second pulsed signal having a second carrier frequency, different from the first carrier frequency, to the proximity switch, the second pulsed signal being substantially synchronous with the first pulsed signal. - View Dependent Claims (9, 10)
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11. A system of a proximity switch and a target wherein the proximity switch has an input terminal adapted to receive a first signal containing digital information, and a first transmitter for transmitting a second signal, containing said digital information, at a first carrier frequency;
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wherein the target has a first receiver for receiving said second signal and a second transmitter for transmitting a third signal, containing said digital information, at a second carrier frequency, different from said first carrier frequency; and
wherein the proximity switch further comprises a second receiver for receiving said third signal and producing a fourth signal, containing said digital information, to be provided at an output terminal of the proximity switch. - View Dependent Claims (12, 13, 14, 15)
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16. A method of determining the presence of a target by providing a proximity switch, comprising:
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transmitting a first pulsed signal having a first carrier frequency from the proximity switch, receiving the first signal in the target, transmitting a second pulsed signal having a second carrier frequency, different from the first carrier frequency, from the target, receiving the second pulsed signal in the proximity switch, and determining that the target is present in response to receiving said second pulsed signal.
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Specification