SMA Camera Module Layout for Compact Variable Aperture Focusing
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Solution Overview
Problem
Existing camera modules with both a variable aperture and a drive motor face challenges in maintaining shooting quality while minimizing their volume.
Innovation Solution
A camera module design that fixes the relative positions of the variable aperture and optical camera lens, utilizing an SMA motor to drive them together for automatic focusing and optical image stabilization, with a simple and compact structure that includes a rolling friction pair and SMA drive assembly to adjust the aperture size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a variable aperture and drive motor are integrated into the camera module, then shooting quality is improved, but the volume of the camera module increases
Solution Approach 1:
The patent combines the variable aperture assembly and drive motor assembly into a single integrated camera module, sharing common structural components such as the lens barrel, circuit board, and housing. This merging approach allows both functions (aperture control and focusing/image stabilization) to coexist in a compact configuration, improving shooting quality while controlling overall module volume.
Solution Approach 2:
The drive motor assembly serves multiple functions: it controls the variable aperture blades, drives the optical lens for focusing, and provides optical image stabilization. By making the drive motor assembly multi-functional, the patent reduces the need for separate mechanisms, thereby improving shooting capabilities without proportionally increasing module volume.
2Volume of stationary object
If the variable aperture and optical camera lens are positioned independently, then the camera module volume can be reduced, but the relative positions change during focusing and image stabilization, affecting shooting quality
Solution Approach 1:
The patent positions the variable aperture assembly and optical lens assembly within the same lens barrel structure, merging their spatial arrangements. This integrated positioning ensures that the relative positions between the aperture and lens remain constant during focusing and image stabilization operations, maintaining shooting quality while keeping the overall module compact.
Solution Approach 2:
Instead of fixing the aperture relative to the lens and allowing the lens to move independently, the patent inverts the approach by moving both the aperture assembly and lens assembly together as a unified structure during focusing and image stabilization, thereby maintaining their relative positional relationship.
3Force
If a traditional drive motor is used to provide sufficient driving force, then the driving capability is improved, but the volume of the drive assembly increases
Solution Approach 1:
The patent replaces traditional mechanical drive motors with a magnetic drive system that uses magnetic attraction and repulsion forces to actuate the variable aperture blades and optical lens. This substitution eliminates the need for large mechanical motor assemblies, providing sufficient driving force while significantly reducing the volume of the drive assembly.
Solution Approach 2:
The patent changes the driving mechanism from mechanical rotation to magnetic field interaction, utilizing electromagnetic parameters to generate force. This parameter change allows for a more compact drive assembly since magnetic fields can exert force without physical contact or large mechanical 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
Ensures shooting quality by maintaining the relative positions of the aperture and lens during motion, while reducing the module's volume through the use of a compact SMA drive assembly with large driving force.
Implementation Method 1
The SMA motor includes a first carrier, a base, and an SMA drive assembly. The SMA drive assembly is configured to drive the first carrier, the optical camera lens, and the variable aperture to move together relative to the base
Implementation Method 2
prolongs the service life with reduced wear and impact resistance
Implementation Method 3
incorporating a simple and efficient variable aperture structure with a rolling friction pair and magnetic attraction for stable adjustment
Data Source
AI summary
This application provides a camera module and an electronic device, and relates to the field of electronic device technologies. The camera module includes an optical camera lens, a variable aperture, and an SMA motor. The variable aperture has an aperture hole whose size is adjustable. The SMA motor includes a first carrier, a base, and an SMA drive assembly. The optical camera lens is fastened to the first carrier. The SMA drive assembly is connected between the first carrier and the base. The SMA drive assembly is configured to drive the first carrier, the optical camera lens, and the variable aperture to move together relative to the base, so as to implement automatic focusing and/or optical image stabilization.