Camera Module Actuator Layout for Stable Focus and Shake Correction
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Solution Overview
Problem
Existing camera modules face challenges in precisely controlling the driving force for shake correction and focusing due to variations in the relative position of magnets and coils during lens module movement along the optical axis.
Innovation Solution
The camera module incorporates a focusing unit with a first magnet and coil facing perpendicular to the optical axis, and a shake correction unit with second and third magnets and coils also facing perpendicular to the optical axis, allowing for precise control of lens module movement in both directions through a carrier and substrate design that maintains consistent relative positions of these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens module is moved in the optical axis direction during focusing operation, then the focusing function is achieved, but the relative position of the magnet and coil for shake correction varies, making it difficult to precisely control the driving force for shake correction
Solution Approach 1:
The patent divides the actuator into two independent parts: a first actuator (first magnet and first coil) for focusing movement in the optical axis direction, and a second actuator (second magnet and second coil) for shake correction movement in the perpendicular direction. This segmentation allows each actuator to be optimized for its specific function without interference from the other, resolving the contradiction between focusing operation and shake correction precision.
Solution Approach 2:
The patent introduces a substrate as an intermediary component that supports both the first coil and the second coil, and a carrier that holds the lens module and first magnet. The substrate and carrier are designed with specific structural features (such as through-holes and positioning structures) that maintain the relative positions of the magnets and coils during lens module movement, enabling precise control of the second actuator while the lens module is being focused.
2Adaptability or versatility
If the relative position of the magnet and coil for shake correction varies during focusing, then the lens module can be moved in the optical axis direction, but the driving force generated by the magnet and coil for shake correction cannot be precisely controlled
Solution Approach 1:
By segmenting the actuator system into a first actuator for focusing and a second actuator for shake correction, the patent ensures that the second actuator's magnets and coils maintain stable relative positions during focusing operations. This segmentation isolates the shake correction function from the focusing movement, maintaining reliability of shake correction control while preserving lens module movement capability.
Solution Approach 2:
The patent employs different structural parameters for the first and second actuators: the first actuator has larger magnets and coils optimized for optical axis movement, while the second actuator has smaller magnets and coils positioned to provide precise perpendicular movement. The substrate and carrier are designed with specific thicknesses and positioning features that maintain the geometric parameters of the second actuator during focusing, ensuring reliable shake correction control.
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
This design enhances both shake correction and focusing performance by ensuring precise control of lens module movements, improving image stability and clarity.
Implementation Method 1
The actuator moves the lens module in an optical axis direction and a direction, perpendicular to an optical axis, using driving force generated by a magnet and a coil
Implementation Method 2
a shake correction unit including a second magnet and a third magnet disposed in the lens module, and a second coil and a third coil disposed on a second substrate disposed on the carrier
Data Source
AI summary
A camera module includes a housing accommodating a lens module and a carrier, a focusing unit including a first magnet disposed in the carrier and a first coil disposed on a first substrate on the housing, and a shake correction unit including a second magnet and a third magnet disposed in the lens module, and a second coil and a third coil disposed on a second substrate on the carrier. The first magnet and the first coil face each other in a first direction. The second magnet and the second coil face each other in the first direction, and the third magnet and the third coil face each other in a second direction. The second magnet and the second coil, and the third magnet and the third coil, move together in an optical axis direction by driving force generated by the first magnet and the first coil.