US 9,438,802 B2 · Optical image stabilization calibration

Abstract

In some embodiments, a camera actuator module includes a linear actuator motor for moving a lens assembly, a position sensor coupled to the lens assembly, a mechanical end stop mounted in the path of motion of the lens assembly, and a non-transitory storage medium storing program instructions. In some embodiments, the program instructions are computer-executable to implement exciting, using the linear actuator motor, a mechanical resonance in the camera actuator module calculated to cause the lens assembly to move to an overload displacement by powering the linear actuator of the camera actuator module at a resonant frequency of the camera actuator module, measuring, using the position sensor, a current maximal displacement of the lens assembly during the exciting using a position sensor, and estimating a position of the mechanical end stop using at least the current maximal displacement.

Claims20

Dependent claims

A camera module, the camera actuator module comprising:

a linear actuator motor for moving a lens assembly;
a position sensor coupled to the lens assembly;
a mechanical end stop mounted in a path of motion of the lens assembly;
and
a non-transitory storage medium storing program instructions, wherein the program instructions are computer-executable to implement:
exciting, using the linear actuator motor, a mechanical resonance in the camera actuator module calculated to cause the lens assembly to move to an overload displacement by powering the linear actuator of the camera actuator module at a resonant frequency of the camera actuator module,
measuring, using the position sensor, a current maximal displacement of the lens assembly during the exciting, and
estimating a position of the mechanical end stop using at least the current maximal displacement.

5 more elements

A non-transitory computer-readable storage medium storing program instructions, wherein the program instructions are computer-executable to implement:

exciting a mechanical resonance in a camera actuator module calculated to cause the camera actuator module to move to an overload displacement by powering a linear actuator of the camera actuator module at a resonant frequency of the camera actuator module;
measuring a current maximal displacement of the actuator module during the exciting;
and
estimating a position of a mechanical end stop using at least the current maximal displacement, wherein the mechanical end stop is mounted in a path of motion of the camera actuator module.

1 more element

Dependencies are inferred from the claim text.

Optical image stabilization calibration

Life of this patent

Optical image stabilization calibration

Life of this patent

Abstract

Claims20