Security marker
AssigneeSensormatic Electronics Corporation
InventorsThomas Solaski, Hubert A. Patterson, Gopal Chandramowle
Life of this patent
Estimating the term…
Abstract
Systems and methods for making a marker. The methods comprise: disposing a resonator with a flat planar cross-sectional profile in a cavity formed in a first substrate partially defining a marker housing; sealing the cavity using a second substrate; placing a first bias element adjacent to the second substrate so that the resonator will be biased by the first bias element when the marker is in use to oscillate at a frequency of a received transmit burst; and using a physical structure in the cavity or a magnetic field passing through the cavity to reduce frictional forces between the resonator and at least the second substrate.
Claims16
A method of making a marker, comprising:
- disposing a resonator with a flat planar cross-sectional profile in a cavity formed in a first substrate partially defining a marker housing;
- sealing an opening of the cavity using a second substrate;
- placing a first bias element adjacent to the second substrate so that the resonator will be biased by the first bias element when the marker is in use to oscillate at a frequency of a received transmit burst;
- and
- using a physical structure in the cavity to reduce frictional forces between the resonator and at least the second substrate, where the physical structure comprises at least one of
- (a) a portion of the first or second substrate that is located at an interface of the first and second substrates, protrudes out and into the cavity, and physically supports only edges of the resonator,
- (b) a textured sidewall of the cavity defined by the second substrate having a plurality of protruding textured shapes;
- and
- (c) a non-conductive mesh material, screen material, or perforated sheet material forming the second substrate.
A marker, comprising:
- a marker housing;
- a resonator with a flat planar cross-sectional profile disposed in a cavity formed in a first substrate partially defining the marker housing;
- a second substrate sealing an opening of the cavity;
- a first bias element placed adjacent to the second substrate so that the resonator will be biased by the first bias element when the marker is in use to oscillate at a frequency of a received transmit burst;
- and
- a physical structure configured to reduce frictional forces between the resonator and at least the second substrate, where the physical structure comprises at least one of
- (a) a portion of the first or second substrate that is located at an interface of the first and second substrates, protrudes out and into the cavity, and physically supports only edges of the resonator,
- (b) a textured sidewall of the cavity defined by the second substrate having a plurality of protruding textured shapes;
- and
- (c) a non-conductive mesh material, screen material, or perforated sheet material forming the second substrate.
Dependencies are inferred from the claim text.