Lens Actuator Layout With Nested Bobbin to Minimize Dead Space
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Solution Overview
Problem
Existing lens driving apparatuses face challenges in minimizing dead space, which is crucial for fabricating compact camera modules in electronic devices.
Innovation Solution
The proposed lens driving apparatus incorporates a yoke with a horizontal and vertical plate, a bobbin movable within the yoke, a coil surrounding the bobbin, and a spring mechanism to return the bobbin to its initial position, all designed to minimize dead space and optimize magnetic force while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional lens driving apparatus designs are used, then the structure is simple and easy to manufacture, but the dead space is large and the overall size cannot be minimized
Solution Approach 1:
The bobbin is movably installed within the yoke structure, and the coil is disposed around the bobbin, creating a nested arrangement where smaller components are placed within or around larger ones. This nesting strategy maximizes space utilization and minimizes dead space in the lens driving apparatus.
Solution Approach 2:
The yoke includes both a horizontal plate and a vertical plate protruding upward, creating a three-dimensional structure that utilizes vertical space. The magnet is provided at the vertical plate to face the coil, effectively using the vertical dimension to reduce horizontal footprint and minimize dead space.
2Adaptability or versatility
If the bobbin is made movable within the yoke to enable lens driving function, then the camera function is achieved, but dead space increases
Solution Approach 1:
The bobbin is designed to be movable within the yoke rather than fixed, enabling the lens driving function through controlled movement. The spring is installed to return the bobbin to its initial position after movement, providing dynamic functionality while maintaining compact dimensions through elastic recovery rather than requiring additional actuation space.
Solution Approach 2:
The spring mechanism is integrated directly into the existing structure by being installed on the yoke, combining the return function with the structural support function of the yoke. This merging eliminates the need for separate return mechanisms that would increase dead space.
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 enables the fabrication of a lens driving apparatus in a small size with minimized dead space, effectively addressing the need for compact camera modules in electronic devices.
Implementation Method 1
a coil fixedly disposed around the bobbin; a plurality of magnets provided at the vertical plate of the yoke to face the coil
Implementation Method 2
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
Data Source
AI summary
Disclosed is a lens driving apparatus. The 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.