Back to results
US 9,430,680 B2Granted
Tamper sensor
AssigneeSeagate Technology LLC
InventorDmitry Obukhov
Life of this patent
Estimating the term…
Abstract
A deformable tamper sensor and tamper resistant electronic system is operable to detect opening of an enclosure and perform actions responsive to the detection. Movable elements within the tamper sensor are held in position when the sensor is compressed and define a multi-bit sensor value. Transitioning the sensor from a compressed to a non-compressed state non-destructively provides a new sensor value through movement of one or more elements.
Claims17
A sensor, comprising:
- a deformable housing enabling the sensor to transition between a compressed state and a non-compressed state in response to externally applied force;
- and
- one or more programming elements movably contained within the housing, the programming elements configured to change position responsive to the sensor transitioning from the compressed state to the non-compressed state, the position of the programming elements held in a fixed position defining, at least in part, a sensor value responsive to the sensor transitioning to the compressed state, the sensor value comprising a multi-bit value that changes each time the sensor is transitioned from the non-compressed state to the compressed state, the one or more internal programming elements immersed in a fluid within a flexible fluid body and moveable to contact different combinations of electrical contacts each time the sensor is transitioned from the non-compressed state to the compressed state to output a different corresponding sensor value in response thereto.
A method, comprising:
- applying a compressive force to compress a housing in which is disposed one or more moveable programmable elements;
- holding the programming elements in a fixed position via the compressed housing, the housing enabling movement of the programming elements in an absence of the compressive force and enabling arrangement of the programming elements in at least one other, different fixed position upon subsequent application of the compressive force thereon, the housing enclosing a fluid which flows responsive to the compressive force applied to the housing, the fluid displacing the programmable elements so as to contact a different set of electrical contacts each time the housing is transitioned from an uncompressed state to a compressed state over a succession of compression intervals;
- converting the fixed position into an electrical signal having a first value, the at least one other, different fixed position providing a different, second value;
- acquiring a multi-bit sensor value corresponding to the first value;
- processing data responsive to the multi-bit sensor value;
- and
- transferring the data processed responsive to the multi-bit sensor value to a host device responsive to a determination that the programming elements are maintained in the fixed position via the compressed housing.
4 more elements
A tamper sensor comprising:
- a fluid within a deformable fluid body, the fluid operable to flow within the fluid body responsive to a change in shape of the fluid body;
- at least one or more programming elements within the fluid, the fluid configured to displace the at least one or more programmable elements so as to contact a different set of electrical contacts each time the fluid body is transitioned from an uncompressed state to a compressed state over a succession of compression intervals, the positioning of the at least one or more programming elements within the fluid body defining, at least in part, a multi-bit digital sensor value and the position of the at least one or more programming elements changeable responsive to the fluid flow, the at least one or more programming elements defining a different multi-bit digital sensor value responsive to different occurrences of the change in shape of the fluid body.
A sensor comprising:
- a deformable fluid body housing a fluid within a flexible membrane;
- and
- at least one programming element disposed within the flexible membrane in contact with the fluid, the programming element moveable between a first position responsive to an absence of an applied compressive force to the housing and a second position responsive to a presence of an applied compressive force to the housing, the programming element outputting a programming value responsive to movement of the programming element to the second position, the programming element outputting a different programming value over each of a succession of transitions between the absence of an applied compressive force to the housing and the presence of the applied compressive force to the housing;
- and
- a plurality of electrical conductors against which the programming element contactingly engages to output the programming value responsive to the movement of the programming element to the second position, the programming element configured to contact a first set of said plurality of electrical conductors during application of an initial applied compressive force to the flexible membrane and to contact a different, second set of said plurality of electrical conductors during application of a subsequent applied compressive force to the flexible membrane after removal of the initial applied compressive force.
2 more elements
Dependencies are inferred from the claim text.