Lens Position Control for Digital Camera Autofocus
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Solution Overview
Problem
Existing autofocus mechanisms in digital cameras face issues with image blurring due to the movement of the magnetic pole, especially with increased pixel density, and struggle to maintain low power consumption while preventing image blurring.
Innovation Solution
A lens position-control system that includes a lens driving unit, a drive-setting unit for optimal power consumption, and a lens position-control unit to manage the focusing lens movement, utilizing micro-step driving and eco-mode operations to minimize power usage and prevent image blurring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the magnetic pole is moved to a position requiring low power consumption, then power consumption is reduced, but image blurring occurs due to lens position deviation
Solution Approach 1:
The patent applies dynamics by making the stopping position of the magnetic pole variable rather than fixed. The lens position-control unit dynamically adjusts the stopping position based on the relationship between the magnetic pole position and lens position, allowing the system to adapt to different operational conditions and eliminate image blurring while maintaining low power consumption.
Solution Approach 2:
The patent implements feedback by using the lens position-control unit to monitor and adjust the magnetic pole stopping position based on the actual lens position. This closed-loop control ensures that the lens stops at the correct position corresponding to the magnetic pole position, preventing image blurring while maintaining energy efficiency.
2Measurement precision
If the light-receiving pixel pitch is decreased to increase resolution, then image resolution is improved, but image blurring intensifies due to magnetic pole movement
Solution Approach 1:
The feedback mechanism in the lens position-control unit becomes increasingly important as pixel pitch decreases. By continuously monitoring lens position and adjusting the magnetic pole stopping position accordingly, the system maintains precise lens positioning even with high-resolution sensors where blurring would be more noticeable.
Solution Approach 2:
The dynamic adjustment of the magnetic pole stopping position allows the system to maintain precise lens positioning for high-resolution images. The control unit dynamically determines the appropriate stopping position based on the pixel pitch and required image quality, ensuring that even small positioning errors do not result in visible blurring.
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
The system effectively stops the lens in a position that minimizes image blur and reduces power consumption, maintaining high image resolution and efficiency in digital cameras.
Implementation Method 1
a lens driving unit supplied with electric power to drive a focusing lens
Data Source
AI summary
Optical equipment capable of stopping a lens in a position producing no image blur and requiring low power consumption is provided. The optical equipment includes a lens driving unit for driving a focusing lens. The equipment further includes a drive-setting unit configured to set an optimal drive amount for positioning the focusing lens at an appropriate focal depth while minimizing the amount of power consumed in the process. The optical equipment includes a lens position-control unit that controls the lens driving unit based on the drive amount set by the drive-setting unit controlling the movement of the focusing lens. The lens position-control unit can stop the lens in a position producing no image blur and requiring low power consumption.