MEMS-based optical image stabilization
First Claim
Patent Images
1. A camera, comprising:
- a plurality of integrally formed electrostatic actuators, each actuator configured to exert a force on at least one lens, wherein each actuator comprises a fixed portion, a movable portion configured to move, relative to the fixed portion, between a first position, in which the actuator is operable, and a second position, in which the actuator is non-operable, and a latch configured to latch the movable portion in the first position;
an optical image stabilization (OIS) algorithm module configured to command the plurality of actuators to actuate the at least one lens responsive to motion of the camera; and
a driver integrated circuit operable to drive the actuators responsive to the OIS algorithm module'"'"'s commands.
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Accused Products
Abstract
In one example, a camera is provided that includes: a plurality of MEMS electrostatic comb actuators, each actuator operable to exert a force on at least one lens; and an optical image stabilization (OIS) algorithm module operable to command the plurality of actuators to actuate the at least one lens responsive to motion of the camera.
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Citations
19 Claims
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1. A camera, comprising:
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a plurality of integrally formed electrostatic actuators, each actuator configured to exert a force on at least one lens, wherein each actuator comprises a fixed portion, a movable portion configured to move, relative to the fixed portion, between a first position, in which the actuator is operable, and a second position, in which the actuator is non-operable, and a latch configured to latch the movable portion in the first position; an optical image stabilization (OIS) algorithm module configured to command the plurality of actuators to actuate the at least one lens responsive to motion of the camera; and a driver integrated circuit operable to drive the actuators responsive to the OIS algorithm module'"'"'s commands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of image stabilization, comprising:
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sensing a motion of a camera using a gyroscope; based upon the sensed motion, determining a desired lens actuation that stabilizes a camera lens; translating the desired lens actuation into desired tangential actuations; tangentially actuating the lens using a plurality of tangential actuators according to the desired tangential actuations; moving a movable portion of each of the plurality of tangential actuators to be latched at a first position, in which the tangential actuator is operable to actuate the lens, before tangentially actuating the lens; filtering sensed camera motion from the gyroscope to provide a prediction of an intended position for the lens; sensing tangential actuations by the plurality of tangential actuations; translating the tangential actuations into a current lens position; and subtracting the current lens position from the intended lens position to provide a lens position error due to unintended camera motion, wherein the desired lens actuation stabilizes the lens by addressing the unintended camera motion. - View Dependent Claims (13, 14, 15)
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16. A system, comprising:
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a lens; a stage holding the lens within a curved aperture; three integrally formed tangential actuators symmetrically disposed about the stage, each tangential actuator operable to displace the stage in a direction tangential to a curve defined by the curved aperture, wherein each tangential actuator comprises a fixed portion, a movable portion configured to move, relative to the fixed portion, between a first position, in which the tangential actuator is operable, and a second position, in which the tangential actuator is not operable, and a latch configured to latch the movable portion in the first position; an optical image stabilization (OIS) algorithm module operable to derive an actuation command for each of the three tangential actuators responsive to motion of the camera; and a driver integrated circuit operable to drive the actuators responsive to the OIS algorithm module'"'"'s commands. - View Dependent Claims (17, 18, 19)
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Specification