Camera Aperture Blade Assembly With Segmented Magnetic Drive
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Solution Overview
Problem
Existing variable apertures in camera modules suffer from poor driving precision and are prone to damage due to interference and deformation of the upper cover.
Innovation Solution
An aperture adjusting apparatus with a rotating support, driving magnet, and driving coil arrangement that reduces magnetic interference and incorporates a first magnetic piece to minimize impact, featuring a cover plate assembly and base assembly with specific magnetic strip configurations and rolling assemblies for stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple groups of magnet coil driving assemblies are symmetrically arranged in the circumferential direction, then the driving force is sufficient, but the Voice Coil Motor (VCM) and Hall chip are interfered with, affecting driving precision
Solution Approach 1:
The patent divides the driving magnet into multiple single-pole magnetic strips arranged in a specific pattern rather than using multiple complete magnet coil assemblies. This segmentation allows the magnetic field to be distributed in a way that provides sufficient driving force while avoiding interference with the VCM and Hall chip, thus resolving the contradiction between force and precision.
Solution Approach 2:
The patent employs an asymmetric arrangement of single-pole magnetic strips on the driving magnet, where the magnetic strips are positioned at specific angular intervals rather than symmetrically. This asymmetric configuration optimizes the magnetic field distribution to provide adequate driving force while creating clear zones that prevent interference with the VCM and Hall chip, thereby maintaining driving precision.
2Reliability
If the upper cover is fixed to the fixed part to prevent blades from escaping, then the blades are contained, but the upper cover deforms due to impact from the rotating part, causing blade damage
Solution Approach 1:
The patent introduces a magnetic attraction mechanism between the first magnetic piece on the cover plate assembly and the driving magnet that creates a cushioning force before physical contact occurs. This magnetic cushioning prevents direct impact between the rotating part and the upper cover, eliminating the deformation issue while maintaining blade containment through the magnetic field.
Solution Approach 2:
The patent uses a magnetic field as an intermediary between the moving rotating part and the stationary upper cover. The first magnetic piece and driving magnet create a magnetic interaction zone that mediates the interaction, providing both blade containment and impact protection without requiring direct mechanical contact between the upper cover and moving parts.
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
Enhances driving precision and prevents damage to the upper cover by reducing magnetic interference and impact, ensuring stable aperture adjustments.
Implementation Method 1
the aperture adjusting apparatus further includes a first magnetic piece. The first magnetic piece is arranged on the cover plate assembly corresponding to the driving magnet. The blade assembly is arranged on a side, facing the cover plate assembly, of the base assembly, and the blade assembly is movably connected to the rotating support and rotates along with the rotating support.
Data Source
AI summary
The disclosure provides an aperture adjusting apparatus, a camera module, and a mobile terminal. The aperture adjusting apparatus includes a cover plate assembly and a base assembly. The cover plate assembly covers the base assembly and forms an accommodating space with the base assembly. The aperture adjusting apparatus further includes a rotating support, a driving magnet, a driving coil, a first magnetic piece, and a blade assembly arranged in the accommodating space. The rotating support is rotatably arranged inside the accommodating space. The driving magnet is arranged on a circumferential side wall of the rotating support, and the driving magnet is formed by combining at least two single-pole magnetic strips or is directly formed by a multi-stage magnet that is integrally formed; the first magnetic piece is arranged on the cover plate assembly corresponding to the driving magnet.