Voice Coil Motor Stepped Yoke for Lens Deflection Control
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Solution Overview
Problem
Current voice coil motors in smart mobile devices face issues with lens deflection due to external forces and weight, leading to friction-induced abrasion and clogging, which can affect the operation and image quality of the lens module.
Innovation Solution
A voice coil motor design incorporating a base, lens housing, voice coil, magnet, and elastic sheets with protrusions and walls that limit the deflectable angle and allow resilient return to the original position, preventing excessive deflection and ensuring the lens module's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens housing is allowed to deflect freely under external forces, then the lens module can move smoothly without resistance, but the lens housing and yoke member will experience friction-induced abrasion and clogging over time
Solution Approach 1:
The patent applies preliminary anti-action by pre-configuring the protrusion-wall interference structure to counteract excessive deflection before it causes harmful friction and abrasion. The protrusions on the lens housing are designed to abut against the yoke member walls when deflection exceeds the predetermined angle, creating a counter-force that prevents further deflection and protects against long-term wear and clogging.
2Reliability
If the lens housing is constrained to prevent deflection, then abrasion and clogging are prevented, but the lens housing cannot quickly return to its original position when deflected
Solution Approach 1:
The patent employs flexible shells and thin films by using the elastic lens housing structure that can flexibly deflect within the predetermined angle range and then quickly return to its original position. The housing's elastic properties enable rapid recovery while the protrusion-wall interference structure ensures that excessive deflection is blocked, combining flexibility with constraint protection.
3Stability of the object's composition
If a rigid constraint structure is used to limit deflection, then the deflectable angle is controlled, but the lens housing cannot quickly move resiliently back to its original position
Solution Approach 1:
The patent applies local quality by making the lens housing elastic in most areas to enable quick resilient return, while locally adding protrusions that create interference with the yoke member walls to control the deflectable angle. This localized constraint approach allows the housing to be flexible overall but controlled at specific critical points, maintaining both speed and stability.
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 limits lens deflection and ensures quick resilient return, preventing abrasion and clogging, thus maintaining the operational integrity and image quality of the lens module.
Implementation Method 1
the first elastic sheet having a hollowed slot, and the first protrusion penetrates the hollowed slot so that the first elastic sheet is disposed on a portion of the first margin wall
Implementation Method 2
Through receiving electrical signals by the voice coil, the voice coil interacts with the magnet, thereby driving the lens to move
Data Source
AI summary
A voice coil motor includes a base, a lens housing, a voice coil, a magnet, a first elastic sheet, and a yoke member. The lens housing has a first margin wall, and a first protrusion and a second protrusion extend from the first margin wall. The height of the second protrusion is lower than the height of the first protrusion. The yoke member has a first wall, a connection wall, a second wall, and a side wall. The first wall, the connection wall, and the second wall together form a stepped structure. The first wall is disposed on the first protrusion, and the second wall is disposed on the second protrusion. The lens housing has a deflectable angle relative to a horizontal reference line. When the lens housing deflects to a maximum value of the deflectable angle, the second protrusion abuts against the second wall.