Cornel Mercea

Bio: Cornel Mercea is an academic researcher from BlackBerry Limited. The author has contributed to research in topics: Stylus & Signal. The author has an hindex of 11, co-authored 32 publications receiving 348 citations.

Stylus location utilizing multiple magnetometers

Abstract: The present disclosure provides a host electronic device, a stylus and a method for determining the location of a stylus with respect to a host electronic device. A magnetic field generator of the stylus is energized and a first magnetic field is sensed at two or more magnetometers of the host electronic device. The location of the stylus with respect to the host electronic device is determined dependent upon the first magnetic field. A second magnetic field may be sensed, while the magnetic field generator is either deactivated or energized with an opposite polarity, to correct for the presence of a background magnetic field. The magnetometers may be directional magnetometers and may be arranged in an array.

Magnetically coupling stylus and host electronic device

Abstract: Magnetic coupling between a stylus and a host electronic device is provided using an array of magnetic field generators that produce a magnetic field in proximity to a drawing surface of the host electronic device. The magnetic field produces a force on a magnetic tip of the stylus. The magnetic field may be controlled dependent upon the location, motion, tilt angle and/or contact force of the stylus and may also be controlled dependent upon images rendered on a display screen that is combined with the drawing surface. The magnetic field may also cause motion in a movable magnet of the stylus. The energy associated with the motion may be harvested to provide power to the stylus.

Rechargeable active pen and electronic device with corresponding charging dock

Abstract: Powered by a battery module, an active pen may transmit a signal that is intended for detection by a touch screen. The active pen may comprise an elongated clip member connected to an elongated body member, the free end of the clip member having a ground contact, and the body member having control and charging contacts opposite the ground contact. The free end may be biased such that the ground contact is normally in contact with the control and charging contacts, thereby maintaining the active pen in a signal-transmitting state until separation of the contacts. An electronic device may charge the battery module, optionally responsive to authorization thereof. The electronic device may comprise a partition member to separate the free end of the clip member from the body member, the partition member having contacts corresponding to those of the active pen for enabling charging of the battery module.

Force sensing stylus

Abstract: The present disclosure provides a force sensing stylus that includes a shaft. The shaft has a tip-end, which protrudes from the stylus body, and an interior-end that is located within the body. The shaft is supported in the body at the tip-end by a compliant element. A multi-axis force sensor, in contact with the interior-end of the shaft, senses lateral and longitudinal components of a force applied to the tip-end of the shaft, or a combination thereof. The sensed force components may be transmitted to an electronic device and used to control an application executed on the device.

System and method of authentication of an electronic signature

Abstract: A system and method supporting signature verification. An input signature from a contact point of a stylus at a touch-sensitive surface is received. At least one sensor detects a first set of characteristics of the input signature that represents how the stylus is used when a present security level is a first level, and a second set of characteristics is determined when a present security level is a second security level. The second set of characteristics is a subset of the first set with fewer characteristics than the first set. One of the first set of characteristics or the second set of characteristics is transmitted to a characteristic receiving device to permit the input signature to be authenticated as a function, at least in part, of the first set or the second set of characteristics.

Techniques for standardizing antenna architecture

Abstract: Technology for standardizing an antenna design for a computing device includes an antenna element in the shape of an object that is commonly useful with multiple, different computing products. For example, in one embodiment the antenna element is a bracket for holding a stylus or other object within a stylus chamber that is associated with the computing device. The dimension and composition of the antenna remain relatively constant to provide a consistent radiation pattern requiring little or no redesign when implemented across the different products, since it may be placed at an edge of a device, by a stylus holder, or similar, common location that is a distance from a ground plane and device circuitry.

Method and apparatus for 3D printing by selective sintering

Abstract: A system ( 100 ) for building a three dimensional object includes a powder delivery station ( 10 ) for applying a layer of powder material on a building tray ( 200 ), a digital printing station ( 30 ) for printing a mask pattern on the layer, a sintering station ( 50 ) for selectively sintering the portion of the layer that is defined by the mask to be sintered and a stage ( 250 ) for repeatedly advancing the building tray ( 200 ) to each of the powder delivery station, digital printing station and sintering station to build a plurality of layers that together form the three dimensional object. The mask pattern defines a negative portion of the layer to be sintered. Optionally, the system includes a die compaction station ( 40 ) for compacting per layer of powder material.

Dnv magnetic field detector

Abstract: A system for magnetic detection includes a nitrogen vacancy (NV) diamond material comprising a plurality of NV centers, a radio frequency (RF) excitation source configured to provide RF excitation to the NV diamond material, an optical excitation source configured to provide optical excitation to the NV diamond material, an optical detector configured to receive an optical signal emitted by the NV diamond material, and a controller. The optical signal is based on hyperfine states of the NV diamond material. The controller is configured to detect a gradient of the optical signal based on the hyperfine states emitted by the NV diamond material.

Interacting tips for a digitizer stylus

Abstract: A stylus for use with a digitizer sensor includes a housing confined by a first and second end, a primary tip positioned at the first end of the housing and associated with a first transmitting element, the first transmitting element having a first diameter, a secondary tip positioned at the second end of the housing and associated with a second transmitting element, the second transmitting element having a second diameter that is larger than the first diameter, a transmitting unit for transmitting a first signal with a first amplitude via the first transmitting element and for transmitting a second signal with a second amplitude via the second transmitting element, wherein the first amplitude is at least twice the second amplitude and a powering unit for powering transmission of the first and second signal.

In-situ power charging

Abstract: A device includes a propulsion unit configured to move the device and a steering unit configured to control the direction of the device. The device also includes a power unit configured to provide power to the propulsion unit and a charging unit configured to use an electric field to provide electrical power to the power unit. The device further includes a first magnetic sensor configured to determine a vector of one or more magnetic fields and a processor communicatively coupled to the propulsion unit, the steering unit, the power unit, and the magnetic sensor. The processor is configured to receive, from the magnetic sensor, a time-varying signal indicative of a magnetic field and determine, based on the time-varying signal, that the magnetic field is associated with an electrical power transmission line. The processor is further configured to cause the steering unit to direct the device toward the electrical power transmission line.