Auto-focus camera module with MEMS distance measurement

摘要

A MEMS actuator for an auto-focus camera module is coupled with a capacitance measurement component configured to determine MEMS actuator capacitance values to be used to determine motion and displacement of the camera module, the optical module and/or one or more movable lenses thereof, and to adapt a position and alignment of the one or more movable lenses to account for a specific focus distance.

主权项

1. A compact optical module configured for coupling with an image sensor component of an auto focus digital camera module, the compact optical module comprising:
an optical train comprising multiple lenses including at least one movable lens a housing configured to contain the optical train and couple with an image sensor component; a MEMS actuator configured to move the at least one movable lens along an optical path to focus a subject onto an image sensor of the image sensor component that is disposed at a focal plane of the optical train and that is coupled to a printed circuit to carry electronic signals that include digital images captured by the image sensor; a capacitance measurement component configured to determine MEMS actuator capacitance values as input to a processor that is programmed accordingly to determine motion and displacement of the camera module, the optical module or the at least one movable lens, or combinations thereof, and to adapt a position and alignment of the at least one movable lens to account for a specific focus distance; and a pair of lens actuator control pads configured to couple to the printed circuit for receiving lens actuator control signals including said MEMS actuator capacitance values.