REMOTE CONTROL SYSTEM FOR LOCKING DEVICE
First Claim
1. A remote control system for controlling actuation of an electro-mechanical transducer, said system comprising a low-power portable transmitter for generating when powered an output signal at a selected frequency, which signal has an appreciable intensity only within a predetermined short range in the near radiation field, said transmitter including means for modulating said signal with pulses of a selected width that are repeated at predetermined regular intervals, a power supply, a timing circuit for controlling the repetition rate of said pulses, a pulse generating circuit for setting the width of said pulses, an oscillator coupled to the output of said pulse generating circuit for providing a modulated R-F signal, and a tuneable antenna for controlling the radiation output from said transmitter, and a receiver located remotely from said transmitter and capable of producing an output to actuate said transducer, said receiver having a sensitivity responsive only to a signal of the intensity of the near field signal generated by said transmitter within said predetermined range, said receiver including a receiving antenna, an R-F amplifier for amplifying signals received by said receiving antenna, an oscillator for generating an output signal at a selected frequency, a mixer coupled to the outputs of said amplifier and said oscillator for combining said output and producing an I-F signal, an I-F amplifier for amplifying the I-F frequency of said mixer, a detector coupled to the output of said I-F amplifier to convert the signal from said amplifier to pulses, a pulse generator for generating standard reference pulses, a two stage comparator having each stage coupled to the output of said pulse generator and to the output of said detector, an error gate coupled to the output of said comparator to produce an output signal if the output of said comparator is within preset limits, and an integrator circuit coupled to the output of said error gate and to said electro-mechanical transducer, said receiver thereby being adapted to produce an output only if it receives a signal of pulses at the selected width and regular intervals and at the frequency of the output signal of said transmitter.
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Accused Products
Abstract
A remote control system for automatically controlling actuation of a device, such as a lock, in response to the proximity of the operator to the device. A portable transmitter providing a coded output is carried by the operator and a receiver is located at the site of the device to be actuated. By utilizing the near radiation field, actuation of the device will occur only when the operator is within a predetermined distance from the receiver.
19 Citations
1 Claim
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1. A remote control system for controlling actuation of an electro-mechanical transducer, said system comprising a low-power portable transmitter for generating when powered an output signal at a selected frequency, which signal has an appreciable intensity only within a predetermined short range in the near radiation field, said transmitter including means for modulating said signal with pulses of a selected width that are repeated at predetermined regular intervals, a power supply, a timing circuit for controlling the repetition rate of said pulses, a pulse generating circuit for setting the width of said pulses, an oscillator coupled to the output of said pulse generating circuit for providing a modulated R-F signal, and a tuneable antenna for controlling the radiation output from said transmitter, and a receiver located remotely from said transmitter and capable of producing an output to actuate said transducer, said receiver having a sensitivity responsive only to a signal of the intensity of the near field signal generated by said transmitter within said predetermined range, said receiver including a receiving antenna, an R-F amplifier for amplifying signals received by said receiving antenna, an oscillator for generating an output signal at a selected frequency, a mixer coupled to the outputs of said amplifier and said oscillator for combining said output and producing an I-F signal, an I-F amplifier for amplifying the I-F frequency of said mixer, a detector coupled to the output of said I-F amplifier to convert the signal from said amplifier to pulses, a pulse generator for generating standard reference pulses, a two stage comparator having each stage coupled to the output of said pulse generator and to the output of said detector, an error gate coupled to the output of said comparator to produce an output signal if the output of said comparator is within preset limits, and an integrator circuit coupled to the output of said error gate and to said electro-mechanical transducer, said receiver thereby being adapted to produce an output only if it receives a signal of pulses at the selected width and regular intervals and at the frequency of the output signal of said transmitter.
Specification
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- Resources
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Current AssigneeMarvin C. Kerber, Russell D. Zimmer
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Original AssigneeMarvin C. Kerber, Russell D. Zimmer
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InventorsZimmer, Russell D., Kerber, Marvin C.
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Primary Examiner(s)Yusko, Donald J.
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Application NumberUS05/159,105Time in Patent Office809 DaysField of Search343/225 340/171R,171PF,164R 325/37,64US Class Current340/12.17CPC Class CodesH04B 5/00 Near-field transmission sys...
