Lens Actuator with Shake Correction Coils for OIS
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Solution Overview
Problem
Hand-held camera devices experience image blur due to shake during photography, which existing lens actuators fail to effectively mitigate through optical image-stabilization (OIS) functions.
Innovation Solution
A lens actuator with a housing, movable unit, focusing coils, and shake correction coils is designed to automatically adjust the lens position using electromagnetic forces, incorporating a magnet holder, spring plates, and a printed circuit board to correct camera shake and optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a lens actuator with OIS function is implemented to stabilize images during handheld photography, then image stability is improved, but device complexity increases due to additional components like shake correction coils and magnet holders
Solution Approach 1:
The patent combines the OIS function with the existing lens actuator structure by integrating shake correction coils and a magnet holder into the housing. The magnet holder is positioned to interact with the coils, and the shake correction coils are arranged to counteract camera shake, thereby stabilizing the image without requiring a completely separate stabilization system.
2Reliability
If shake correction coils and magnet holder are added to the lens actuator housing, then optical image stabilization is achieved, but manufacturing complexity increases
Solution Approach 1:
The housing structure is designed to serve multiple functions: it provides structural support, contains the shake correction coils, and houses the magnet holder. This multi-functional design reduces the need for additional separate components, thereby simplifying the manufacturing process while achieving optical image stabilization.
3Manufacturing precision
If multiple coils and magnetic components are integrated into the lens actuator, then image quality is enhanced through stabilization, but the size of the lens actuator increases
Solution Approach 1:
The patent employs a nested arrangement where the magnet holder is positioned within the housing and the shake correction coils are arranged around the optical axis, with the lens holder and lens nested within the housing. This nested configuration allows multiple components to occupy overlapping or adjacent spaces, minimizing the overall volume of the lens actuator while maintaining image stabilization functionality.
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 solution effectively stabilizes images by detecting camera shake and adjusting the lens position in real-time, reducing blur and enhancing image quality during handheld photography.
Implementation Method 1
a coil wound around the lens holder and a stationary magnet separated from the coil and interacted with the coil for generating an electromagnetic force for driving the coil together with the lens to move approaching or away along an optical axis
Implementation Method 2
incorporating a magnet holder, spring plates, and a printed circuit board to correct camera shake and optical axis alignment
Data Source
AI summary
A lens actuator is disclosed in the present invention. The lens actuator includes a movable unit including a carrier defining an optical axis, a plurality of focusing coils surrounding the carrier and spaced with each other, each wound around an axis perpendicular to the optical axis, fixed on an outer surface of the carrier, a plurality of magnets each opposite to one of the focusing coils in a direction perpendicular to the optical axis direction, and a holder fixing the magnets; a plurality of shake correction coils each disposed below one of the magnets and opposite to the magnet in the optical axis direction; a base fixing the shake correction coils; and wires connecting the movable unit to the base.