Camera Actuator Illumination-Adaptive Driving Scheme
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Solution Overview
Problem
Existing camera module actuators introduce noise into image signals during optical image stabilization (OIS) in low illumination environments, which affects image quality.
Innovation Solution
An actuator and driving apparatus for a camera module that adjusts its driving scheme based on external illumination levels, using a linear driving scheme in low illumination and a pulse width modulation (PWM) driving scheme in high illumination, to minimize noise introduction during OIS operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If PWM driving scheme is used for the driving coil, then power consumption is reduced and driving efficiency is improved, but noise is introduced into the image signal in low illumination environments
Solution Approach 1:
The patent applies dynamics by making the driving scheme changeable based on illumination conditions. The control unit dynamically switches between PWM and linear driving schemes according to the illumination level detected by the illumination sensor, allowing the system to adapt its energy consumption and noise characteristics to the current operating environment.
Solution Approach 2:
The patent changes the driving parameter (driving scheme) based on illumination conditions. In high illumination environments, PWM mode is used for energy efficiency, while in low illumination environments, linear mode is used to minimize noise. This parameter change resolves the contradiction by selecting the appropriate driving mode for each condition.
2Object-affected harmful factors
If linear driving scheme is used for the driving coil, then noise introduction is minimized in low illumination environments, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the driving scheme based on real-time illumination detection. The control unit monitors illumination levels and switches between linear and PWM modes accordingly, ensuring that linear mode (lower noise) is used only when necessary in low light conditions, while PWM mode (lower power) is used in brighter environments.
Solution Approach 2:
The driving parameter (driving scheme) is changed based on illumination conditions. Linear mode is selected in low illumination to minimize noise, while PWM mode is selected in high illumination to reduce power consumption. This conditional parameter change resolves the contradiction by optimizing for the dominant constraint in each environment.
3Reliability
If OIS function is activated to suppress hand-shake influence, then image quality is improved, but the system becomes more complex and power consumption increases
Solution Approach 1:
The actuator system serves multiple functions: it performs OIS by moving the lens barrel perpendicular to the optical axis to suppress hand-shake, and it also enables auto-focusing by moving the lens barrel along the optical axis. This multi-functionality justifies the added complexity by providing comprehensive camera control capabilities.
Solution Approach 2:
The OIS system uses feedback from the illumination sensor and control unit to dynamically adjust the driving scheme. The control unit receives illumination information and adjusts the driving mode accordingly, creating a feedback loop that optimizes performance while managing complexity through intelligent control rather than additional hardware.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents noise introduction into image signals during OIS in low illumination environments, maintaining image quality by dynamically adjusting the driving scheme based on illumination conditions.
Implementation Method 1
a driving coil facing the magnetic body
Implementation Method 2
a magnetic body disposed on one side surface of a lens barrel; a driving coil facing the magnetic body
Data Source
AI summary
An actuator of a camera module includes a magnetic body disposed on one side surface of a lens barrel, a driving coil, and a driving apparatus. The driving coil faces the magnetic body. The driving apparatus is configured to drive the driving coil in one of a linear driving scheme and a pulse width modulation (PWM) driving scheme based on an external illumination information in an illumination signal and move the lens barrel in a direction perpendicular to an optical axis direction.