Camera Actuator Layout for Independent OIS and Autofocus Motion
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Solution Overview
Problem
Conventional actuators for camera modules face challenges in precisely controlling the driving force generated by magnets and coils for autofocusing and optical image stabilization, leading to difficulties in achieving precise movement of the lens module.
Innovation Solution
The actuator design includes a housing, a base, a carrier, and a guide member, with multiple magnets and coils arranged to generate driving forces in different directions, utilizing ball members and guide grooves to facilitate precise movement of the carrier and base, allowing for improved autofocusing and optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens module is moved in the optical axis direction while autofocusing is performed, then the relative positions of the magnet for image stabilization and the coil for image stabilization are changed, but it becomes difficult to precisely control the driving force generated by the magnet and coil for image stabilization
Solution Approach 1:
The actuator is divided into two independent drive units: a first drive unit for image stabilization (moving the base in directions perpendicular to the optical axis) and a second drive unit for autofocusing (moving the carrier in the optical axis direction). This segmentation allows each unit to operate independently, so that autofocusing movements do not affect the relative positions of magnets and coils in the image stabilization unit, thereby maintaining precise control of the driving force for image stabilization.
Solution Approach 2:
The patent introduces a hierarchical movement structure where the base moves in directions perpendicular to the optical axis (X and Y directions) for image stabilization, while the carrier moves relative to the base in the optical axis direction (Z direction) for autofocusing. This dimensional separation ensures that movements in the Z direction do not alter the relative positions of components in the X-Y plane, preserving the precision of image stabilization control.
2Measurement precision
If the relative positions of the magnet for image stabilization and the coil for image stabilization are changed, then the driving force control becomes difficult, but maintaining fixed relative positions limits the autofocusing movement range
Solution Approach 1:
The actuator is divided into two independent drive units: a first drive unit for image stabilization (moving the base in directions perpendicular to the optical axis) and a second drive unit for autofocusing (moving the carrier in the optical axis direction). This segmentation allows each unit to operate independently, so that autofocusing movements do not affect the relative positions of magnets and coils in the image stabilization unit, thereby maintaining precise control of the driving force for image stabilization.
Solution Approach 2:
The patent introduces a hierarchical movement structure where the base moves in directions perpendicular to the optical axis (X and Y directions) for image stabilization, while the carrier moves relative to the base in the optical axis direction (Z direction) for autofocusing. This dimensional separation ensures that movements in the Z direction do not alter the relative positions of components in the X-Y plane, preserving the precision of image stabilization 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 the precision and efficiency of autofocusing and optical image stabilization, enabling smaller component sizes and improved image stabilization performance.
Implementation Method 1
a second drive unit generating a driving force in the one direction, and including a magnet and a coil
Implementation Method 2
a first drive unit generating driving forces in a first direction perpendicular to the one direction and a second direction perpendicular to both the one direction and the first direction, and including a plurality of magnets and a plurality of coils
Implementation Method 3
utilizing ball members and guide grooves to facilitate precise movement of the carrier and base
Data Source
AI summary
An actuator for a camera includes a housing having an inner space, a base and a carrier, disposed in the housing in one direction, a first drive unit generating driving forces in a first direction perpendicular to the one direction and a second direction perpendicular to both the one direction and the first direction, and including a plurality of magnets and a plurality of coils, and a second drive unit generating a driving force in the one direction, and including a magnet and a coil, wherein an optical member is disposed on the carrier, wherein the carrier and the base are configured to be moved together in the first direction and the second direction, and wherein the carrier is configured to be moved relative to the base in the one direction.