Camera Module Inner Yoke Length Optimization
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Solution Overview
Problem
The existing camera module designs with inner yokes face challenges in electromagnetic efficiency and manufacturability due to yoke length issues, leading to interference and foreign material introduction during auto focusing and motion.
Innovation Solution
A camera module design featuring a bobbin with accommodation grooves and inner yokes that are bent and spaced to minimize interference and collect foreign materials, with the inner yoke's length optimized to maintain electromagnetic efficiency and prevent foreign material introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the length of the inner yoke is too short, then the assembly becomes convenient and the number of components is reduced, but the electromagnetic efficiency declines and interference with the coil unit occurs
Solution Approach 1:
The patent optimizes the length parameter of the inner yoke to a specific range (20-40% of the magnet length) to balance electromagnetic efficiency with assembly simplicity. This parameter optimization resolves the contradiction by finding the optimal value that maintains sufficient electromagnetic performance while keeping the structure compact and easy to assemble.
2Loss of energy
If the length of the inner yoke is too long, then the electromagnetic efficiency is maintained, but the verticality and concentricity become difficult to manage and manufacturability is degraded
Solution Approach 1:
The patent establishes an upper bound for the inner yoke length (20-40% of magnet length) to prevent excessive length that would compromise manufacturability. This parameter constraint ensures that the yoke remains easy to manufacture while maintaining sufficient electromagnetic efficiency, resolving the contradiction between performance and manufacturability.
3Volume of moving object
If the inner yoke length is reduced for compact design, then the device size is reduced, but foreign materials may be introduced and electromagnetic efficiency declines
Solution Approach 1:
The patent determines an optimal inner yoke length range (20-40% of magnet length) that prevents foreign material introduction while maintaining compact device size. This parameter optimization ensures that the yoke is long enough to prevent contamination but not so long that it increases device volume unnecessarily.
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 minimizes interference and foreign material introduction, maintains optimal electromagnetic characteristics, and enhances manufacturability by ensuring the inner yoke's length is sufficient to prevent efficiency decline and maintain verticality and concentricity.
Implementation Method 1
The voice coil motor is driven by electromagnetic interaction between magnets fixed at a holder member and a coil unit wound on an outer circumferential surface of a bobbin
Implementation Method 2
a yoke made of a major material of iron (Fe) that is a ferromagnetic body is provided in order to form a magnetic path of the magnet
Data Source
AI summary
A camera module may comprise: a printed circuit board on which an image sensor is mounted; a holder member disposed above the printed circuit board and having a plurality of magnets installed thereon; a bobbin installed on the inside of the holder member to be capable of moving along an optical axis, and having a coil unit installed on the outer peripheral surface thereof to be capable of electrically interacting with the magnets; a plurality of receptacles formed in the peripheral surface of the bobbin to form spaces that are separated from the coil unit; and a cover member having a plurality of integrally formed inner yokes, which are formed at positions corresponding to the plurality of receptacles and have the surface on one side thereof separated a certain distance from the coil unit and the surface on the other side thereof separated a certain distance from the bobbin.