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US 10,649,228 B2Granted
Optical image stabilization actuator driver power distribution control
AssigneeSTMicroelectronics S.r.l.
InventorsMark A. Lysinger, Pavan Nallamothu, Chih-Hung Tai, James L. Worley
Life of this patent
Estimating the term…
Abstract
Various embodiments provide an optical image stabilization circuit including a drive circuit having a power waveform generator and a power waveform conversion circuit. The power waveform generator generates a power waveform. The power waveform conversion circuit converts the power waveform to a power drive signal. An actuator is then driven by the power drive signal to move a lens accordingly and compensate for any movements and vibrations of a housing of the lens.
Claims20
A device, comprising:
- a lens;
- an actuator configured to move the lens;
- a position sensor configured to measure a position of the lens;
- a gyroscope configured to measure movement of the device;
- a controller configured to determine drive signal data based on the position of the lens and the movement of the device;
- a power waveform generator configured to generate a power waveform based on the drive signal data, the power waveform having a calculated minimum non-zero amplitude value, a calculated maximum non-zero amplitude value, and a calculated intermediate non-zero amplitude value;
- and
- a power waveform conversion circuit including:
- a digital to analog converter configured to convert the power waveform into a voltage signal having amplitude values corresponding to the calculated minimum non-zero amplitude value, the calculated maximum non-zero amplitude value, and the calculated intermediate non-zero amplitude value;
- a voltage to current converter circuit configured to apply a gain to the voltage signal, and convert the voltage signal to an electric current signal;
- and
- a driver circuit configured to drive the actuator with the electric current signal to move the lens.
9 more elements
A device, comprising:
- a power waveform generator configured to receive drive signal data, and generate a power waveform based on the drive signal data, the power waveform having a calculated minimum non-zero amplitude value, a calculated maximum non-zero amplitude value, and a calculated intermediate non-zero amplitude value;
- and
- a power waveform conversion circuit, including:
- a digital to analog converter configured to convert the power waveform into a voltage signal;
- a voltage to current converter circuit configured to apply a gain to the voltage signal, and convert the voltage signal to an electric current signal;
- and
- a driver circuit configured to output the electric current signal.
4 more elements
A device, comprising:
- an actuator;
- a power waveform generator configured to receive drive signal data, and generate a power waveform based on the drive signal data, the power waveform including a plurality of cycles, the power waveform having a calculated minimum non-zero amplitude value, a calculated maximum non-zero amplitude value, and a calculated intermediate non-zero amplitude value in each of the plurality of cycles;
- a power waveform conversion circuit including:
- a digital to analog converter configured to convert the power waveform into a voltage signal;
- a voltage to current converter circuit configured to apply a gain to the voltage signal, and convert the voltage signal to an electric current signal;
- and
- a driver circuit configured to drive the actuator with the electric current signal to move a lens.
4 more elements
Dependencies are inferred from the claim text.