Autonomous low-power voice coil motor parking
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United States of America Patent
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Jun 2, 2020
Grant Date -
Jan 18, 2018
app pub date -
Jul 13, 2017
filing date -
Jul 15, 2016
priority date (Note) -
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Abstract
A camera module includes an optics assembly, an actuator module, and detection circuitry for preventing the optics assembly from colliding with a mechanical stop due to physical impacts and disturbances. The actuator module includes a magnet and a coil. The detection circuitry detects an induced current caused by movement of the coil with respect to the magnet. The direction of the detected induced current indicates movement of the optics assembly in a particular direction along an optical axis. The detection circuitry provides a current to the coil to cause the optics assembly to move toward a particular position or direction. In some cases, the provided current may cause the optics assembly to move in a direction opposite of the movement that caused the induced current.
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