Lens Drive Device Power Mode Selection
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Solution Overview
Problem
Current lens drive devices consume high power due to continuous operation of position detection circuits, even when the lens position is not being actively detected, leading to increased power consumption in image capture systems.
Innovation Solution
A lens drive device with multiple operation modes that selectively adjusts power consumption based on the need for position detection, including a continuous detection mode and a power-saving mode, where the position detecting unit intermittently operates to reduce power usage, and uses stored detection signals when the lens position is stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position detection circuit operates continuously to detect lens position, then the lens control accuracy is maintained, but the power consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the position detection operation adjustable between continuous and intermittent modes. The control unit dynamically switches the detection frequency based on system state, transforming a static continuous operation into a dynamic adaptive operation that balances accuracy and power consumption.
Solution Approach 2:
The patent changes the operational parameters of the position detection circuit by adjusting the detection cycle frequency. When power saving is needed, the detection cycle is extended (frequency reduced), and when accuracy is prioritized, the detection cycle is shortened (frequency increased), thereby optimizing the trade-off between measurement precision and energy consumption.
2Use of energy by moving object
If the position detection circuit operates intermittently to reduce power consumption, then the power consumption decreases, but the lens control accuracy may be compromised
Solution Approach 1:
The patent implements feedback control where the control unit continuously monitors the lens position and system state, then adjusts the detection frequency accordingly. When the lens is stationary or moving slowly, detection frequency is reduced to save power. When the lens is actively adjusting or positioned unexpectedly, the detection frequency increases to maintain accuracy, ensuring the system responds appropriately to actual needs.
Solution Approach 2:
The patent employs periodic action by switching between different detection cycles based on operational requirements. Instead of continuous detection, the system uses periodic detection with variable intervals, allowing the position detection circuit to operate in bursts rather than continuously, thereby reducing overall power consumption while maintaining necessary monitoring capability.
3Productivity
If multiple operation modes are implemented to optimize power consumption, then the power management efficiency improves, but the device complexity increases
Solution Approach 1:
The control unit is designed with multi-functionality, serving both as the central controller for lens drive operations and as the mode selection logic for power management. This universal component handles multiple functions including position detection control, drive signal generation, and power mode management, thereby implementing multiple operation modes without proportionally increasing overall device complexity.
Data Source
AI summary
A lens drive device includes a position detecting unit that outputs a detection signal indicating a position of a detected lens and includes a plurality of operation modes allowing operation with different power consumptions, a selecting unit that select an operation mode in which the position detecting unit operates from the plurality of operation modes, a position signal generation unit that generates, a lens position signal based on either one of detection signals depending on the selected operation mode, a calculation unit that calculates a drive amount of the lens based on a target position signal indicating a target position of the lens and the lens position signal; and a drive unit that drives the lens based on the drive amount.