Camera Module Aperture Electromagnetic Actuation Weight Reduction
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Solution Overview
Problem
Camera modules in portable electronic devices face challenges in incorporating a mechanical aperture due to structural and space constraints, leading to increased weight and potential degradation of autofocusing and optical image stabilization functions.
Innovation Solution
A camera module design that includes an aperture module with a housing accommodating a lens module, featuring a driving magnet and coil configuration perpendicular to the optical axis, allowing for adjustable light incidence through rotating plates and minimizing weight increase by positioning driving coils on the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mechanical aperture is incorporated in the camera module, then light incidence can be adjusted according to imaging environment, but the weight of the camera module increases
Solution Approach 1:
The patent replaces the traditional mechanical aperture system with an electromagnetic actuation system. A driving coil generates a magnetic field that interacts with a driving magnet to rotate the aperture plates, eliminating the need for complex mechanical linkages, springs, and counterweights. This substitution of mechanical components with electromagnetic components reduces the overall weight while maintaining the aperture adjustment function.
Solution Approach 2:
The patent extracts the power connecting portion (driving coil) from the aperture structure itself and positions it on the housing. This separation removes the heavy coil from the moving aperture assembly, reducing the weight of the moving components while allowing the aperture to remain lightweight and agile for rapid adjustment.
2Ease of operation
If driving coils are provided in the aperture itself, then aperture can be driven, but the power connecting portion is caught by vertical movement of lens during autofocusing
Solution Approach 1:
The patent extracts the driving coil from the aperture assembly and relocates it to the housing. This spatial separation ensures that the power connecting portion remains stationary on the housing while the aperture and lens can move freely during autofocusing without interfering with the electrical connection. The driving magnet moves with the aperture, maintaining electromagnetic coupling through the stationary coil.
Solution Approach 2:
The patent uses a magnetic field as an intermediary between the stationary driving coil and the moving driving magnet. This allows power transmission without physical contact or mechanical connection, enabling the aperture to be driven reliably while moving independently during autofocusing operations without disrupting the power connection.
3Adaptability or versatility
If aperture module is mounted on lens module, then light control is achieved, but autofocusing and optical image stabilization functions are degraded
Solution Approach 1:
The patent replaces mechanical coupling between the aperture module and lens module with electromagnetic actuation. The driving coil on the housing interacts with the driving magnet in the aperture module, allowing the aperture to be controlled independently without mechanical linkages that would interfere with lens movement during autofocusing and optical image stabilization.
Solution Approach 2:
The patent segments the camera module into independent functional units: the lens module for focusing and stabilization, and the aperture module with its own electromagnetic actuation system. This segmentation allows each module to operate independently without mechanical interference, maintaining full autofocusing and optical image stabilization functionality while achieving light control.
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
Enables selective adjustment of light incidence while maintaining autofocusing and optical image stabilization functions, reducing weight and preventing degradation of these functions even when the aperture module is mounted.
Implementation Method 1
at least one of the plurality of plates is configured to be driven by an interaction between a driving magnet provided in the aperture module and a driving coil provided on the housing
Data Source
AI summary
A camera module includes a housing accommodating a lens module, and an aperture module coupled to an upper portion of the lens module. The aperture module includes a plurality of plates having an incident hole configured to change an amount of light incident on the lens module. At least one of the plurality of plates is configured to be driven by an interaction between a driving magnet provided in the aperture module and a driving coil provided on the housing opposing the driving magnet in a first direction substantially perpendicular to an optical axis direction.