Lens Moving Module Structure for Shock-Resistant Tremor Compensation
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Solution Overview
Problem
Existing voice coil motors in camera modules are difficult to apply to micro-scale and low power consumption devices, and they struggle with shock and hand tremor-induced shaking, necessitating a solution for stress distribution and improved accuracy in hand tremor compensation.
Innovation Solution
A lens moving apparatus with a bobbin, coil, magnet, elastic members, and support members that distribute stress and improve hand tremor compensation, featuring a symmetrical outer frame with coupling regions and connection portions to enhance stability and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a voice coil motor is used in a camera module, then the lens can be moved for focusing and hand tremor compensation, but the device becomes difficult to apply to micro-scale and low power consumption applications
Solution Approach 1:
The camera module is divided into separate functional components: a movable lens assembly (bobbin) for focusing and hand tremor compensation, and a separate shock-absorbing elastic member. This segmentation allows the lens driving mechanism to be miniaturized while the shock protection function is handled independently by the elastic member, resolving the contradiction between small size and shock resistance.
Solution Approach 2:
The elastic member is pre-installed between the bobbin and housing to provide shock absorption before shock occurs. This beforehand cushioning protects the lens driving apparatus from shock and vibrations without requiring a larger structure, enabling micro-scale design while maintaining reliability under shock conditions.
2Reliability
If shock protection is added to the camera module, then reliability under shock conditions improves, but the device complexity increases
Solution Approach 1:
The elastic member serves multiple functions simultaneously: it acts as a shock-absorbing element, a mounting structure for the bobbin, and a mechanism for hand tremor compensation. This multi-functionality reduces the need for separate components, thereby improving shock resistance without significantly increasing device complexity.
Solution Approach 2:
The elastic member is designed as a flexible component with specific elastic properties that allow it to absorb shock and vibrations while maintaining a compact form. This flexible structure provides shock protection without requiring bulky rigid protective elements, thus improving reliability without excessive complexity increase.
3Strength
If the outer frame uses multiple connection portions to connect coupling regions, then stress distribution improves, but the manufacturing precision requirements increase
Solution Approach 1:
The connection portions are designed with asymmetric width variations, where each connection portion has a different width adapted to its specific structural requirements. This asymmetric design allows optimization of stress distribution at each connection point while accommodating manufacturing tolerances, as each connection portion can be independently optimized rather than requiring uniform precision across all connections.
Solution Approach 2:
Each connection portion is designed with locally optimized properties (different widths) according to its specific functional requirements and stress conditions. This local quality approach allows the structure to achieve optimal stress distribution overall while each individual connection portion can be manufactured within standard precision tolerances, reducing the cumulative precision requirements.
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 apparatus effectively distributes stress and improves accuracy in hand tremor compensation, ensuring clear image capture in small electronic devices by mitigating the effects of shock and user-induced vibrations.
Implementation Method 1
a first coil and a magnet configured to electromagnetically interact with each other so as to move the bobbin
Implementation Method 2
an elastic member including an inner frame coupled to the bobbin, an outer frame coupled to the housing, and a frame connection portion configured to connect the inner frame and the outer frame to each other
Data Source
AI summary
Embodiments provide a lens moving apparatus including a bobbin in which a lens is mounted, a first coil and a magnet configured to electromagnetically interact with each other so as to move the bobbin, a housing configured to accommodate the bobbin therein, an elastic member including an inner frame coupled to the bobbin, an outer frame coupled to the housing, and a frame connection portion configured to connect the inner frame and the outer frame to each other, and a support member connected to the elastic member and configured to support the housing, and the outer frame includes a first coupling portion coupled to the housing, a second coupling portion coupled to the support member, the second coupling portion being spaced apart from the first coupling portion, and a single connection portion configured to connect the first coupling portion and the second coupling portion to each other.