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US 10,649,229 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.
Claims19
A method, comprising:
- measuring a position of a lens in a housing;
- measuring movement of the housing;
- determining drive signal data based on the position of the lens and the movement of the housing;
- generating a waveform based on the drive signal data, the waveform including a plurality of time intervals, the waveform having a minimum non-zero amplitude value in one or more of the plurality of time intervals, a maximum non-zero amplitude value in one or more of the plurality of time intervals, and an intermediate non-zero amplitude value in one or more of the plurality of time intervals, the generating of the waveform including:
- calculating the minimum non-zero amplitude value, the maximum non-zero amplitude value, and the intermediate non-zero amplitude value based on the drive signal data;
- and
- minimizing a total number of transitions between the minimum non-zero amplitude value and the maximum non-zero amplitude value in the waveform by arranging the order of the plurality of time intervals in the waveform;
- converting the waveform to a drive signal;
- and
- moving the lens by driving an actuator with the drive signal.
7 more elements
A method, comprising:
- receiving, by a power waveform generator, drive signal data;
- calculating, by the power waveform generator, a minimum non-zero amplitude value, a maximum non-zero amplitude value, and an intermediate non-zero amplitude value based on the drive signal data;
- assigning, by the power waveform generator, the minimum non-zero amplitude value, the maximum non-zero amplitude value, and the intermediate non-zero amplitude value to a plurality of time intervals of a waveform;
- reducing, by the power waveform generator, a total number of transitions between the minimum non-zero amplitude value and the maximum non-zero amplitude value in the waveform by arranging the order of the plurality of time intervals in the waveform;
- generating, by the power waveform generator, the waveform;
- converting, by a power waveform conversion circuit, the waveform to a drive signal;
- and
- driving, by the power waveform conversion circuit, an actuator with the drive signal.
5 more elements
A method, comprising:
- receiving, by a power waveform generator, drive signal data;
- calculating durations of a plurality of time intervals for a waveform based on the drive signal data calculating, by the power waveform generator, a minimum non-zero amplitude value, a maximum non-zero amplitude value, and an intermediate non-zero amplitude value based on the drive signal data;
- assigning, by the power waveform generator, the minimum non-zero amplitude value, the maximum non-zero amplitude value, and the intermediate non-zero amplitude value to the plurality of time intervals;
- arranging, by the power waveform generator, the order of the plurality of time intervals in the waveform to reduce a total number of transitions between the minimum non-zero amplitude value and the maximum non-zero amplitude value in the waveform;
- generating, by the power waveform generator, a multi-cycle waveform having a plurality of cycles, the multi-cycle waveform including the waveform in each of the plurality of cycles;
- converting, by a power waveform conversion circuit, the multi-cycle waveform to a drive signal;
- and
- driving, by the power waveform conversion circuit, an actuator with the drive signal.
5 more elements
Dependencies are inferred from the claim text.