Antitheft device
First Claim
1. An antitheft device attached to a product capable of being carried by hand, for detecting theft of the product and issuing an alarm, comprising:
- a vibration sensor detecting a vibration of specified magnitude or more in horizontal and vertical directions;
move distance estimating means for estimating a distance of movement of the product from a start of vibration based on a time interval between vibrations detected by said vibration sensor and a number of times the vibration is repeated; and
alarming means for issuing an alarm when the estimated distance of movement has become greater than or equal to a predetermined distance.
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Accused Products
Abstract
An antitheft device is provided which is attached to a product such as an OA apparatus for detecting theft of the product and issuing an alarm. When vibration is detected by a vibration sensor, move distance estimating means estimates a distance of movement of the product from the start of vibration based on the time interval between vibrations detected by the vibration sensor and the number of times vibration is repeated. When the estimated distance of movement has become greater than or equal to a predetermined distance, alarming means issues an alarm by means of a speaker or the like. Schedule management means causes monitoring to be executed only in a preset day(s) of the week or in a preset time zone.
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Citations
11 Claims
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1. An antitheft device attached to a product capable of being carried by hand, for detecting theft of the product and issuing an alarm, comprising:
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a vibration sensor detecting a vibration of specified magnitude or more in horizontal and vertical directions; move distance estimating means for estimating a distance of movement of the product from a start of vibration based on a time interval between vibrations detected by said vibration sensor and a number of times the vibration is repeated; and alarming means for issuing an alarm when the estimated distance of movement has become greater than or equal to a predetermined distance. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of detecting theft of a portable product having vibration sensor on the product, comprising:
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detecting horizontal and vertical vibrations of the product using the sensor; estimating a movement distance for the product responsive to a time interval between the vibrations; and issuing an alarm when the distance exceeds a predetermined value.
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8. A method of detecting theft of a portable product, comprising:
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estimating a movement distance of the product responsive to vibrations of a vibration sensor in horizontal and vertical directions and a time interval between vibrations; and issuing an alarm when the distance exceeds a predetermined value.
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9. A method of detecting theft of a hand holdable, portable product having a vibration sensor, comprising:
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detecting horizontal and vertical vibrations of the product using the vibration sensor; determining a time interval between vibrations; estimating a movement distance for the product responsive to the time interval; and issuing an alarm when the distance exceeds a predetermined value.
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10. An apparatus for detecting theft of a portable product, comprising:
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a vibration sensor coupled to the product and detecting horizontal and vertical vibrations of the sensor with the product; and a control section coupled to the sensor, estimating a movement distance of the product responsive to a time interval between the vibrations and issuing an alarm when the distance exceeds a predetermined value.
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11. An apparatus for detecting theft of a portable product, comprising:
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a vibration sensor coupled to the product and producing a vibration sensor signal responsive to vibration of the product; and a control section coupled to the sensor, estimating a movement distance of the product from the sensor signal from a time interval between the vibrations and issuing an alarm when the distance exceeds a predetermined value.
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Specification