Lens Drive Device Terminal Segmentation for Spring Stability
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Solution Overview
Problem
Existing lens drive devices face issues with spring member deformation due to terminal bending, leading to variations in spring constant and inadequate movement of the movable body, especially when external forces are applied.
Innovation Solution
A lens drive device design featuring a spring member with electrically separated spring pieces, where both ends of the coil are connected to different spring pieces, and terminals are separated from the spring pieces with elongated connecting parts that prevent deformation by transmitting external forces along the insulation member, ensuring the spring constant remains consistent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end part of the spring piece is bent to be drawn outside of the support body as a terminal, then electrical connection is achieved, but the spring piece is deformed causing spring constant variation
Solution Approach 1:
The terminal is divided into separate components: the spring piece and the terminal are electrically connected but structurally separated. The spring piece maintains its elastic function while the terminal provides electrical connection, eliminating the deformation issue caused by bending the spring piece end.
Solution Approach 2:
The terminal function is extracted from the spring piece. Instead of using the spring piece end as the terminal, a separate terminal structure is introduced that connects to the spring piece, allowing the spring piece to maintain its original shape and spring constant.
2Ease of operation
If the terminal is bent to extend outside the support body, then electrical power can be supplied, but external force causes deformation of the spring member
Solution Approach 1:
The terminal is segmented into distinct functional zones: an outside connecting terminal part for electrical connection, an elongated connecting part for force isolation, and an inside connecting terminal part for spring connection. This segmentation allows external forces to be isolated from the spring piece.
Solution Approach 2:
The elongated connecting part acts as an intermediary between the outside connecting terminal part and the inside connecting terminal part. It transmits electrical connection while isolating the spring piece from external forces applied to the terminal.
3Reliability
If the elongated connecting part is made longer to prevent force transmission, then spring piece deformation is reduced, but device size increases
Solution Approach 1:
The elongated connecting part extends along the inner wall of the insulation member in a spatial arrangement that efficiently uses available space. This dimensional arrangement allows sufficient length for force isolation without proportionally increasing overall device volume.
4Reliability
If the spring piece is electrically separated into multiple pieces, then terminal deformation is prevented, but device complexity increases
Solution Approach 1:
The spring member is segmented into multiple electrically isolated spring pieces, each connected to separate terminals. This segmentation prevents deformation while maintaining structural simplicity through modular design that can be manufactured and assembled efficiently.
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 effectively prevents spring member deformation, maintaining a consistent spring constant and ensuring satisfactory movement of the movable body using both magnetic drive and spring urging forces, while also reducing the device size and facilitating easier soldering.
Implementation Method 1
a magnetic drive mechanism for magnetically driving the movable body in a lens optical axis direction
Implementation Method 2
a spring member which is connected between the support body and the movable body
Data Source
AI summary
A lens drive device may include a support body, a movable body having a lens, a magnetic drive mechanism for magnetically driving the movable body in a lens optical axis direction, and a spring member connected between the support body and the movable body. The magnetic drive mechanism includes a coil held by the movable body and both end parts of the coil are electrically connected to different spring pieces of the spring member through terminals. The support body includes an insulation member which holds the terminals, and each of the terminals includes an outside connecting terminal part which is located on an outer side of the insulation member, and a long elongated connecting part which is extended along an inner wall of the insulation member from the outside connecting terminal part and connected with the spring piece of the spring member.