Tamper-Detection Device and Method to Detect Unauthorized Operations on Apparatus
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United States of America
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Issued Date -
Mar 20, 2025
app pub date -
Nov 27, 2024
filing date -
Nov 27, 2024
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Abstract
A device and a method to detect unauthorized opening of a casing is disposed in the upper or lower casing of an apparatus. The device includes a base plate with vibrator, carrier, and sensor on the lower case, and receiving grooves. Balls of a lesser number than the number of receiving grooves are installed in the grooves in a predetermined arrangement by the manufacturer. A waveguide element and magnet, fixed on the upper casing, is in contact with the balls, and when the waveguide is vibrated, the number and locations of the balls govern the form of a setting signal derived therefrom at the factory. If the upper casing is separated from the lower casing, the waveguide element separates from the carrier, the magnetic element gathers the balls, the predetermined arrangement being thereby lost, when tested by an authorized repair engineer.
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