3m Innovative Properties Company

Albert H Libbey

Bernard O Geaghan

Billy Lee Weaver

M Benton Free

Karl P Hauck

Kathy L Hagen

An untethered stylus is configured to cooperate with a location sensor that generates a magnetic field. The stylus include a housing having a tip and a shield. Circuitry, including a power circuit, is provided in the housing. An antenna arrangement provided at the housing includes multiple coil resonant circuits each tuned to a different frequency of the magnetic field. A first coil resonant circuit energizes the power circuit in response to the magnetic field, which provides DC power to the circuitry. One or more other coil resonant circuits are coupled between the tip and shield of the housing to define separate channels for communicatively coupling the stylus tip and the location sensor. An information signal communicated between the stylus tip and the location sensor is substantially unperturbed during provision of DC power by the first coil resonant circuit.

Untethered stylus employing separate communication and power channels

Systems and methods provide for adaptive drive signal adjustment to improve reception of a stylus signal at a location sensor. A location sensing system includes an untethered stylus comprising circuitry configured to receive a drive signal and transmit a stylus signal. The circuitry is configured to be energized by the received drive signal and includes frequency-sensitive circuitry. A location sensor includes a controller and a sensing array. The location sensor is configured to generate the drive signal and receive the stylus signal. The controller is configured to adjust a parameter of the drive signal that improves receptivity of the stylus signal by the location sensor.

Location sensing system and method employing adaptive drive signal adjustment

An energy transfer apparatus with a magnetic shield is configured to magnetically couple energy from a fixed location to a mobile or moveable device within a field-activated space of the energy transfer apparatus. Apparatuses include a location sensing surface and a drive coil arranged in relation to a periphery of the location sensing surface. A magnetic shield plate is disposed below the location sensing surface and the drive coil. The shield plate includes a number of radially oriented slots originating at, and distributed about, a periphery of the shield plate.

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Eliot, ME, United States of America

Albert H Libbey