Voice Coil Motor Terminal Insulation for Short-Circuit Prevention
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Solution Overview
Problem
Conventional voice coil motors experience frequent malfunctions due to electrical short-circuits between the elastic member and the cover can, which are caused by the cover's attempt to block harmful electromagnetic waves, preventing the proper functioning of the motor.
Innovation Solution
The voice coil motor design includes a cover can that blocks electromagnetic waves while incorporating a short-circuit prevention portion in the elastic member's terminal portion, which extends between the cover can and the base, preventing electrical contact and thus avoiding short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the cover can covers surfaces of the voice coil motor to block harmful electromagnetic waves, then electromagnetic shielding is improved, but electrical short-circuit between the cover can and the elastic member occurs
Solution Approach 1:
An insulation layer is introduced as an intermediary between the elastic member and the cover can. This insulation layer prevents direct electrical contact between the two components, thereby avoiding short-circuits while allowing the cover can to maintain its electromagnetic shielding function. The insulation layer acts as a mediator that preserves both the shielding effectiveness and the electrical reliability.
Solution Approach 2:
The solution addresses the short-circuit problem by adding a dimensional layer (the insulation layer) between the elastic member and the cover can. This additional layer in the radial dimension prevents electrical contact without compromising the electromagnetic shielding performance of the cover can.
2Object-affected harmful factors
If the cover can is used to block electromagnetic waves, then electromagnetic interference is reduced, but short-circuit prevention structure complexity increases
Solution Approach 1:
The insulation layer is implemented as a thin film or coating on the elastic member or cover can. This thin film provides the necessary electrical insulation without adding significant structural complexity or volume to the device. The flexible nature of the thin film allows it to conform to the existing geometry of the components.
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 design effectively inhibits short-circuits between the cover can and the elastic member, enhancing the operational reliability and performance of the voice coil motor by ensuring uninterrupted power supply to the coil block.
Implementation Method 1
The mover includes a coil block that produces a magnetic field to drive a lens up and down
Implementation Method 2
The stator faces the mover, and produces a magnetic field to drive the mover
Implementation Method 3
The elastic member elastically supports the mover that moves up and down
Data Source
AI summary
Disclosed is a voice coil motor, the motor including a mover having a bobbin equipped with a lens and a coil block secured to an outer circumference of the bobbin; a stator having a magnet that is disposed in such a way as to face the coil block; elastic members coupled to a lower end of the bobbin and connected to both ends of the coil block; a base supporting the elastic members and the stator; and a cover can covering the mover, the stator and the base, with an opening being formed in the cover can to expose the lens therethrough, wherein each of the elastic members includes a terminal portion that extends between the cover can and a side surface of the base, the terminal portion including a short-circuit prevention portion so as to inhibit a short-circuit between the terminal portion and the cover can.