Iris Module with Perpendicular Driving Magnet for Compact Camera
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Solution Overview
Problem
Camera modules in portable electronic devices face challenges due to structural limitations, leading to difficulties in incorporating a separate iris mechanism, which results in weight increase, degraded autofocusing, and inaccurate aperture positioning.
Innovation Solution
The iris module includes a base with a yoke and a driving magnet that opposes the yoke, allowing for precise control of apertures through rotational movement, reducing weight and maintaining accurate aperture formation without degrading autofocusing functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a separate iris mechanism is incorporated into the camera module, then light intensity control is improved, but weight increases
Solution Approach 1:
The iris mechanism is merged with the lens module by integrating the iris driver and blades directly into the lens assembly structure. The iris blades are positioned within the lens module housing, and the driving magnet is integrated into the lens module's moving components, allowing the iris function to be combined with the existing lens structure rather than adding a completely separate mechanism.
Solution Approach 2:
The lens module is designed to perform multiple functions: it serves as both the focusing mechanism and the iris actuator. The same moving components that enable autofocusing also drive the iris blades to control aperture size. This multi-functionality eliminates the need for separate dedicated iris mechanisms, reducing overall weight while maintaining light intensity control capability.
2Illumination intensity
If a separate iris mechanism is incorporated into the camera module, then light intensity control is improved, but autofocusing performance deteriorates
Solution Approach 1:
The iris driver is merged with the autofocusing mechanism by using the same moving components and magnetic field interactions for both functions. The driving magnet that moves with the lens during autofocusing also interacts with the iris blades to control aperture size. This integration ensures that both autofocusing and iris control operate harmoniously without interfering with each other's performance.
Solution Approach 2:
The iris blades are designed to be dynamically controllable through the movement of the driving magnet during autofocusing. As the lens module moves during autofocusing, the magnetic field changes dynamically, which in turn dynamically adjusts the iris aperture size. This dynamic coupling ensures that the iris function adapts to the focusing state without degrading autofocusing speed or accuracy.
3Volume of moving object
If the iris module is mounted in a narrow space, then compactness is improved, but aperture positioning accuracy deteriorates
Solution Approach 1:
The iris positioning mechanism utilizes the optical axis dimension vertically, allowing the driving magnet to move along the optical axis to control aperture size. This vertical arrangement along the optical axis enables accurate aperture positioning within the limited radial space of the compact lens module, transforming the positioning problem from a radial constraint to a vertical movement solution.
Solution Approach 2:
The traditional mechanical linkage system for iris control is replaced with a magnetic field-based actuation system. The driving magnet interacts with the iris blades through magnetic attraction without requiring complex mechanical linkages or precise mechanical tolerances. This substitution of magnetic actuation for mechanical transmission enables accurate aperture positioning while maintaining a compact structure with fewer moving parts and reduced spatial requirements.
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 solution enables the camera module to effectively control light intensity while minimizing weight and maintaining accurate autofocusing and shake correction capabilities, ensuring consistent image quality across varying illuminance conditions.
Implementation Method 1
The housing includes a coil to react with the magnet to drive the iris module
Implementation Method 2
a driving magnet movable in a direction perpendicular to an optical axis direction, and disposed to oppose the yoke
Data Source
AI summary
An iris module and a camera module including the iris module. The iris module includes a base including a yoke, blades disposed on an object side of the base, and a driving magnet movable in a direction perpendicular to an optical axis direction, and disposed to oppose the yoke. The yoke includes holding portions on both ends of the yoke, and the holding portions protrude in a direction of the driving magnet.