Processing Circuit Gyro Signal Gain Control
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Solution Overview
Problem
Optical image stabilization systems in electronic devices are limited by the physical space occupied by the lens, restricting the range of movement and leading to incomplete compensation for device vibrations, resulting in blurred images or video.
Innovation Solution
A processing circuit that includes an amplifier, integration circuit, and gain control circuit to process gyro signals, adjust gain coefficients, and limit signal output to prevent actuator saturation, allowing for extended compensation of device movements beyond the physical limitations of the lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lens movement range is increased to compensate for larger device vibrations, then image stabilization performance is improved, but the physical space occupied by the lens and surrounding components increases
Solution Approach 1:
The patent changes the parameter of lens movement range by implementing a limited movement mode where the lens is constrained to move within a predetermined range. When vibration compensation requires movement beyond this range, the system switches to a different operational mode rather than physically expanding the lens travel distance, thus maintaining compact device dimensions while still providing stabilization within available space.
Solution Approach 2:
The patent implements dynamic switching between different stabilization modes: a first mode for small vibrations where the lens moves freely within its physical range, and a second mode for large vibrations where the lens is constrained to predetermined limits. This dynamic adaptation allows the system to optimize performance for different vibration scenarios without requiring increased physical space.
2Volume of moving object
If the lens is constrained to move within a predetermined range to save space, then device compactness is improved, but the ability to compensate for large device vibrations deteriorates
Solution Approach 1:
The patent introduces an intermediary control mechanism that detects when vibration compensation would require lens movement beyond the predetermined range. When such conditions are detected, the system switches to a second mode that applies alternative compensation strategies within the constrained range, effectively mediating between the space constraint and the need for vibration compensation.
Solution Approach 2:
The patent applies partial action by providing full vibration compensation only within the predetermined lens movement range. For vibrations exceeding this range, the system provides partial compensation within available space rather than attempting full compensation, accepting that some residual motion will remain while maintaining compact device dimensions.
3Reliability
If the processing circuit limits the gyro signal output to prevent actuator saturation, then system reliability is improved, but the range of motion compensation is restricted
Solution Approach 1:
The processing circuit uses feedback from the gyro signal to detect when the integrated value approaches saturation limits. When the signal exceeds a predetermined threshold, the circuit automatically adjusts the gain or limits the output to prevent actuator saturation, creating a closed-loop control system that maintains reliability while managing the compensation range.
Solution Approach 2:
The system performs preliminary integration of the gyro signal and compares the integrated value against predetermined thresholds before commanding full actuator movement. This preliminary action allows the system to prepare for potential saturation conditions and take preventive measures, such as gain reduction or signal limiting, before the actuator reaches its operational limits.
Data Source
AI summary
Various embodiments of the present technology may provide a method and apparatus for a processing circuit. The processing circuit may include an amplifier and other processing circuitry that operate together to process and/or adjust a gyro signal. The processing circuit may include an integration circuit configured to compute a first value and adjust the first value to a predetermined maximum value if the first value is greater than the predetermined maximum value. The processing circuit may also include a gain control circuit configured to compute a first coefficient based on the first value; select one of: the first coefficient and a second coefficient; and adjust a gain of the amplifier according to the selected coefficient.