Back to results
US 10,520,748 B2Granted
Optical image stabilization actuator driver power distribution control
AssigneeSTMicroelectronics S.r.l.
InventorsMark A. Lysinger, Chih-Hung Tai, James L. Worley, Pavan Nallamothu
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;
- and
- a drive circuit configured to:
- calculate a base amplitude value based on the drive signal data;
- calculate a minimum non-zero amplitude value by shifting bits of the base amplitude value,
- calculate a maximum non-zero amplitude value based on the minimum non-zero amplitude value,
- calculate durations for the minimum non-zero amplitude value, the maximum non-zero amplitude value, and an intermediate non-zero amplitude value based on the drive signal data,
- generate a waveform using the minimum, the maximum, and the intermediate non-zero amplitude values and the durations for the minimum, the maximum, and the intermediate non-zero amplitude values,
- convert the waveform to a drive signal, and
- drive the actuator to move the lens, the waveform including a plurality of cycles, each of plurality of cycles including the minimum, the maximum, and the intermediate non-zero amplitude values.
11 more elements
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 calculate parameters based on the position of the lens and the movement of the device, the calculated parameters including:
- a base amplitude value that is calculated based on the position of the lens and the movement of the device,
- a minimum non-zero amplitude value that is calculated by shifting bits of the base amplitude value, and
- a maximum non-zero amplitude value that is calculated based on the minimum non-zero amplitude value;
- a power waveform generator configured to generate a waveform based on the calculated parameters, the waveform including a plurality of cycles, each of plurality of cycles including the minimum non-zero amplitude value, the maximum non-zero amplitude value, and an intermediate non-zero amplitude value;
- a power waveform converter configured to convert the waveform to a to a drive signal;
- and
- a drive circuit configured to drive the actuator with the drive signal to move the lens.
9 more elements
A device, comprising:
- an actuator;
- a waveform generator configured to:
- receive drive signal data;
- calculate a base amplitude value based on the drive signal data;
- calculate a minimum non-zero amplitude value by shifting bits of the base amplitude value,
- calculate a maximum non-zero amplitude value based on the minimum non-zero amplitude value,
- calculate durations of the minimum non-zero amplitude value, the maximum non-zero amplitude value, and an intermediate non-zero amplitude value based on the drive signal data;
- and
- generate a waveform based on the minimum, the maximum, and the intermediate non-zero amplitude values and durations of the minimum, the maximum, and the intermediate non-zero amplitude values, the waveform including a plurality of cycles, each of plurality of cycles including the minimum, the maximum, and the intermediate non-zero amplitude values;
- a waveform converter configured to convert the waveform to a drive signal;
- and
- a drive circuit configured to drive the actuator with the drive signal.
9 more elements
Dependencies are inferred from the claim text.