Motion sensitive security system
DCFirst Claim
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1. In a security system:
- a motion sensor comprising a magnet and a coil disposed in the field of the magnet, one of the magnet and coil being fixed and the other being moveable relative to the fixed one in the direction toward and away therefrom in a first plane, and being moveable relative to the fixed one in a perpendicular plane perpendicular to said first plane and parallel to the plane containing said fixed one, and being moveable rotatably about an axis extending substantially along the intersection of said first plane and said perpendicular plane.
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Abstract
The preferred arrangement utilizes a magnet suspended at the center of an elastic cord over a pickup coil. Movement of the magnet is sensed by the coil in that signals are generated by such movement. The signals are processed in the combination of a time delay circuit and a comparator to provide an output which is a measure of acceleration of the element on which the elastic cord is mounted and, in one form, by a measure of jerk in a similar time delay circuit and comparator combination.
49 Citations
22 Claims
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1. In a security system:
a motion sensor comprising a magnet and a coil disposed in the field of the magnet, one of the magnet and coil being fixed and the other being moveable relative to the fixed one in the direction toward and away therefrom in a first plane, and being moveable relative to the fixed one in a perpendicular plane perpendicular to said first plane and parallel to the plane containing said fixed one, and being moveable rotatably about an axis extending substantially along the intersection of said first plane and said perpendicular plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a security system:
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sensing means for providing a motion signal in response to motion imparted to an element of the sensing means; a signal processing means responsive to said motion signal for providing an output signal; said signal processing means comprising first, second and third time delay circuits the first time delay circuit being connected to delay operation of the second and third time delay circuits and the second time delay circuit being connected to delay provision of said output signal following receipt by said signal processing means of a motion signal for a period determined only by said second time delay circuit; said third time delay circuit being connected to continue furnishing of said output signal following termination of the motion signal for a period determined, after completion of the operation of said second time delay circuit, only by said third time delay circuit. - View Dependent Claims (16, 17, 18, 19)
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20. In a security system:
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a magnet and a coil disposed in the field of the magnet such that a signal voltage is generated in the coil as an incident to relative movement between the magnet and the coil; and a signal processor capable of sensing voltage variations across the coil and of providing an output singal, means for providing an output signal, said signal processor comprising first output signal providing means for providing an output signal in response to signal voltages greater than a first given magnitude for a period of first duration; said processor further comprising second output signal providing means for providing an output signal in response to signal voltages greater than a second given magnitude for a period of second duration; said first and second output signal providing means each comprising a time delay circuit and an associated comparator connected to compare the current amplitude of said signal voltage with its amplitude at a time prior by the amount of said delay. - View Dependent Claims (21, 22)
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Specification