Camera Lens Coil Winding Layout for Balanced Electromagnetic Thrust
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Solution Overview
Problem
Conventional lens driving apparatuses experience a difference in electromagnetic force due to the unequal number of turns of the wire in the coil, leading to potential imbalances in thrust generation.
Innovation Solution
The lens driving apparatus incorporates a flange with notches and holding parts for the extended ends of the coil, ensuring equal turns of the wire across the entire circumference, and uses a regulation part to maintain balanced winding, preventing differences in electromagnetic force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wire is wound around the lens holding member with winding start and end parts arranged in opposite directions, then the coil structure is simplified, but the number of turns differs by one turn in semi-annular portions causing electromagnetic force imbalance
Solution Approach 1:
The coil is divided into two independent coils (first coil and second coil) wound in opposite directions around the lens holding member. Each coil has its own winding start and end parts, allowing independent control of turn numbers. This segmentation enables both semi-annular portions to have equal numbers of turns while maintaining the simplified winding structure.
Solution Approach 2:
The patent uses symmetric winding in terms of turn number (equal turns in both semi-annular portions) but asymmetric in terms of winding direction (one coil wound clockwise, the other counter-clockwise). This asymmetric approach with opposite winding directions allows the electromagnetic forces to balance while maintaining structural simplicity.
2Force
If the wire is wound to cover the entire circumference, then the electromagnetic force is maximized, but the unequal turn distribution causes thrust imbalance
Solution Approach 1:
The single continuous wire winding is segmented into two separate coils with equal turn numbers. Each coil contributes equally to the electromagnetic force while maintaining balanced thrust distribution. The segmentation allows full circumferential coverage without the imbalance caused by unequal turn distribution in semi-annular portions.
Solution Approach 2:
Different regions (semi-annular portions) of the coil are given different winding directions (clockwise and counter-clockwise) while maintaining equal turn numbers. This local differentiation in winding direction ensures that each region contributes equally to the overall electromagnetic force and thrust balance.
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 configuration ensures consistent electromagnetic force distribution, maintaining balanced thrust generation and preventing imbalances, thereby enhancing the performance and reliability of the lens driving mechanism.
Implementation Method 1
a driving part that has at least a coil provided outside the tubular part of the lens holding member and a plurality of magnets facing the coil, and that moves the lens holding member in the optical axis direction
Data Source
AI summary
A lens driving apparatus includes a fixed member, a lens holding member having a tubular part capable of holding a lens body, a support member, and a driving part that has a coil and magnets, wherein the lens holding member has a flange and a regulation part, wherein the flange has a first notch and a second notch, a first holding part provided corresponding to the first notch, and a second holding part provided corresponding to the second notch, wherein the coil has a winding part, a first extended part, and a second extended part, wherein the winding part has winding layers, and wherein a first turn of a wire annular portion of the winding part connected to the first extended part includes a first portion and a second portion, the first portion being positioned in a first region, and the second portion being positioned in a second region.