Lens Drive Plate Spring Elastic Section Design
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Solution Overview
Problem
Existing lens driving devices face challenges with unstable power feeding terminals due to low strength and tip position instability, and unstable contact points between plate springs and terminals, primarily caused by thin plate springs and soldering methods.
Innovation Solution
A lens driving device design featuring a plate spring with a movable-body-fixed section, a base-section-fixed section, an arm section, and an elastic section connecting these, allowing for stable electric connection between the plate spring and terminal, enhancing the connection's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the plate spring is made thin to reduce size, then the camera unit can be more compact, but the power feeding terminal strength and tip position stability deteriorate
Solution Approach 1:
The plate spring is divided into multiple functional sections: a thin main body for compactness, a reinforced terminal portion for strength, and an elastic section for positioning. This segmentation allows each part to be optimized independently - the main body remains thin for size reduction while the terminal portion gains strength through structural reinforcement.
Solution Approach 2:
Different portions of the plate spring have different thicknesses and properties. The terminal portion has increased thickness and reinforcement for strength, the elastic section has specific flexibility for positioning stability, while only the main body is thin for compactness. This local differentiation resolves the contradiction between overall size reduction and local strength requirements.
2Volume of moving object
If the plate spring is made thin to reduce size, then the camera unit can be more compact, but the tip position stability deteriorates
Solution Approach 1:
The plate spring is segmented into a thin main body and a thicker terminal portion with the elastic section. This segmentation allows the terminal portion to maintain stable positioning while the overall structure remains compact due to the thin main body.
Solution Approach 2:
The elastic section acts as an intermediary between the thin main body and the reinforced terminal portion. It provides the necessary mechanical compliance to ensure tip position stability while allowing the main body to remain thin for compactness.
3Reliability
If soldering is used to connect the plate spring to the terminal, then electrical connection can be achieved, but the contact point stability deteriorates
Solution Approach 1:
The plate spring is pre-formed with a recess portion that precisely receives the terminal before soldering. This preliminary positioning action ensures that the terminal is correctly aligned and stabilized at the contact point before the soldering process, preventing displacement and ensuring stable contact points.
4Device complexity
If the plate spring is bent to create power feeding terminals, then the structure can be simplified, but the connection stability to the substrate deteriorates
Solution Approach 1:
The plate spring structure is segmented into functional sections including the elastic section, terminal portion, and recess portion. This segmentation maintains relative structural simplicity while enabling stable connection through the specifically designed recess that secures the terminal to the substrate.
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 achieves stable electric connection between the plate spring and terminal, improving the reliability and strength of the power feeding mechanism, thereby addressing the instability issues in existing devices.
Implementation Method 1
an elastic section connecting the base-section-fixed section and the terminal connection section to each other and urging the terminal connection section to the terminal
Data Source
AI summary
A part (91, 92) of a lower plate spring (9) of a lens driving device (1) includes a base-fixed section (911, 921) fixed to a base (11), a lens holder fixing section (912, 922) fixed to a lens holder (8), and an arm section (913, 923) connecting the base-fixed section (911, 921) and the lens holder fixing section (912, 922) to each other, the base-fixed section (911, 921) including a terminal connection section (911b, 921b) near which an elastic section (911c, 921c) is provided.