OPTICAL IMAGE STABILIZATION IN A DIGITAL STILL CAMERA OR HANDSET
First Claim
1. An optical image stabilization system comprising:
- a sensor;
a camera module with an attached magnet on at least two sides;
a housing with voice coils on at least two sides and aligned with the at least two magnets;
a spring with ability to rotate about x axis and y axis; and
control electronic integrated circuit comprising a gyroscope, close loop control electronics, voice coil drive electronics, and processing capability;
wherein the system is capable of detecting hand jitter and cancelling such jitter autonomously without the need for external controls.
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Abstract
An optical image stabilization system for a camera module is disclosed. The stabilization system comprises a voice coil motor (VCM), at least one digital gyroscope for receiving signals from the VCM, and an angular velocity sensor for receiving signals from the digital gyroscope and outputting an angular position error signal. The stabilization system further comprises signal processing logic for receiving the error signal, and comparing the error signal to a reference signal and providing a stabilized image based upon that comparison, wherein the hard-coded logic, digital gyroscope and rate and position sensor resides on the same chip.
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Citations
28 Claims
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1. An optical image stabilization system comprising:
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a sensor; a camera module with an attached magnet on at least two sides; a housing with voice coils on at least two sides and aligned with the at least two magnets; a spring with ability to rotate about x axis and y axis; and control electronic integrated circuit comprising a gyroscope, close loop control electronics, voice coil drive electronics, and processing capability; wherein the system is capable of detecting hand jitter and cancelling such jitter autonomously without the need for external controls. - View Dependent Claims (2, 3)
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4. An optical image stabilization system for a camera module comprising:
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a voice coil motor (VCM), at least one gyroscope for receiving signals from the VCM; and signal processing logic for receiving a signal from the at least one gyroscope, and comparing the signal from the at least one gyroscope to a reference signal and providing a stabilized image based upon that comparison, wherein the signal processing logic and the at least one gyroscope reside on the same chip. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An optical image stabilization system for a camera module comprising:
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a voice coil motor (VCM), a first gyroscope for receiving signals from the VCM, and providing a first estimation of the angular position in the x direction; a second gyroscope for receiving signals from the VCM and providing a second estimation of the angular position in the y direction; and an estimator based controller for receiving signals from the first and second digital gyroscopes and outputting an angular position signal; and
signal processing logic for receiving, and comparing the angular position signal to a reference signal and providing a stabilized image based upon that comparison, wherein the signal processing logic, and the first and second digital gyroscopes reside on the same chip. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method for providing optical image stabilization for a camera module;
- the method comprising;
receiving a reference signal by a summation element; providing a signal from the summation element to a peak filter, the peak filter provides a filtered signal to increase rejection gain of hand jitter frequencies; providing the filtered signal to an estimator based controller, the estimator based controller provides for compensation of the filtered signals with no integrators or differentiators; providing the compensated filtered signal to gyroscope and voice coil motor (VCM) notch filters, wherein the notch filters attenuate the compensated filtered signals for gyroscope errors; utilizing the compensated filtered signal to drive a VCM to provide a corrective movement to the camera module; sensing the corrective movement by a gyroscope to provide a resultant signal; providing the resultant signal to the estimator based controller to provide a compensated signal; and providing the compensated signal to the summation element to be compared with the reference signal.
- the method comprising;
Specification