Methods and systems for optical sensing of forces in a toothbrush

    公开(公告)号:US11051609B2

    公开(公告)日:2021-07-06

    申请号:US16301258

    申请日:2017-05-24

    Abstract: An oral cleaning device (10) for characterizing a position of a brush head of the device. The oral cleaning device includes: a body portion (12); a brush head (14) extending from the body portion, where at least a portion of the brush head is configured to move relative to the body portion; a controller (30); and an optical sensor (28) positioned relative to the brush head member and body portion and being in communication with the controller, where the optical sensor is configured to obtain optical sensor data resulting from a deflection or rotation of the brush head member relative to the body portion; the controller being configured to receive the optical sensor data and determine the deflection or rotation of the brush head member relative to the body portion.

    Foreign object detection in a wireless power transfer system

    公开(公告)号:US11424645B2

    公开(公告)日:2022-08-23

    申请号:US16097656

    申请日:2017-05-02

    Abstract: A wireless power transfer system includes a power receiver (105) receiving a power transfer from a power transmitter (101) via a wireless inductive power transfer signal. The power transmitter (101) comprises a transmit power coil (103) generating the power transfer signal. A test signal coil (209) coupled to a test signal generator (211) generates a magnetic test signal. A plurality of spatially distributed detection coils (213) is coupled to measurement unit (215) generating a set of measurement values reflecting signals induced in the detection coils (213) by the magnetic test signal. A processor (217) determines a measurement spatial distribution of the measurement value where the spatial distribution reflects positions of the detection coils (213). A foreign object detector (219) detects a presence of a foreign object in response to a comparison of the measurement spatial distribution to a reference spatial distribution. The foreign object detector (219) is arranged to determine the reference spatial distribution in response to data received from the power receiving device (105).

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