Lens Actuator Layout for Compact Camera Modules
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Solution Overview
Problem
Existing lens driving apparatuses for small electronic devices face challenges in minimizing dead space to achieve a compact size while maintaining effective camera functionality.
Innovation Solution
A lens driving apparatus design featuring a polygonal base, hexahedral housing, and a metal yoke with a cylindrical bobbin and angular column magnet, optimized for minimal space usage, where the magnet's curved planes maximize electromagnetic force and the coil's structure ensures efficient movement of the lens module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional lens driving apparatus designs are used, then camera functionality is maintained, but dead space increases and device size becomes large
Solution Approach 1:
The yoke and base are integrated into a unified structure where the yoke is directly coupled to the base, eliminating the need for separate mounting components and reducing dead space between parts. This merging of components directly addresses the contradiction by reducing overall device volume while maintaining structural integrity and camera functionality.
Solution Approach 2:
The bobbin is received within the yoke's inner cylindrical portion, and the holder is received within the bobbin, creating a nested arrangement of moving components. This nesting minimizes radial space requirements and reduces dead space, enabling compact device design while preserving all necessary camera functions.
2Volume of moving object
If compact design is implemented, then device size is reduced, but magnetic force may be insufficient for effective lens movement
Solution Approach 1:
The magnet is positioned specifically on the inner surface of the yoke's vertical plate, concentrating magnetic force precisely where needed to act on the coil during lens movement. This localized placement ensures sufficient magnetic force is generated within the compact yoke structure, resolving the contradiction between small size and adequate driving force.
Solution Approach 2:
The electromagnetic actuator utilizes the radial dimension for magnetic force generation, with the magnet on the yoke and coil on the bobbin facing each other radially. This dimensional arrangement allows efficient force transmission in a compact radial space, maintaining sufficient magnetic force while minimizing overall device volume.
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 design allows for a compact lens driving apparatus with minimized dead space, enabling efficient movement of the lens module while maintaining sufficient magnetic force, thus suitable for small electronic devices with camera functions.
Implementation Method 1
A magnet is fixed to an inner portion of the yoke. A coil is fixed to an outer portion of the bobbin while facing the magnets.
Data Source
Figure 1~2
Figure 3~4
AI summary
Disclosed is a lens driving apparatus. The lens driving apparatus lens driving apparatus includes a base formed at a center thereof with a first opening; a housing coupled with the base and having a second opening corresponding to the first opening; a yoke installed on the base and including a horizontal plate having a third opening corresponding to the first opening and a vertical plate protruding upward from the horizontal plate; a bobbin movably installed in the yoke and coupled with a lens module; a coil fixedly disposed around the bobbin; a plurality of magnets provided at the vertical plate of the yoke to face the coil; and a spring installed on at least one of upper and lower portions of the yoke to return the bobbin, which has moved up due to interaction between the magnet and the coil, to its initial position.