Optical Lens Module Aperture Shape Accuracy
Solution Overview
Problem
Conventional adjustable aperture modules in optical lens systems for electronic devices do not accurately match the theoretical optical performance due to the irregular shape of the light passing aperture formed by rotatable blades, leading to suboptimal image quality and background blurring.
Innovation Solution
An optical lens module with an adjustable aperture module featuring rotatable blades that include a rotatable portion and a light blocking portion, where the light blocking portion extends and tapers, and a driving component that rotates the blades to vary the size of the light passing aperture, ensuring it approximates a theoretical aperture shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional rotatable blades are used to form the light passing aperture, then the adjustable aperture module can control the amount of light entering the imaging lens, but the aperture shape does not substantially match the theoretical optical aperture shape, resulting in suboptimal optical performance
Solution Approach 1:
The blade assembly is divided into multiple independent rotatable blades (typically 5-8 blades), each capable of rotating around the optical axis. This segmentation allows the aperture to be formed by the collective positioning of multiple simple blade elements rather than requiring a single complex blade structure, thereby achieving accurate circular aperture shape while maintaining manufacturing simplicity.
Solution Approach 2:
The blades are designed to be rotatable around the optical axis, transforming the static aperture structure into a dynamic one. By rotating the blades to different angular positions, the aperture size can be continuously adjusted while maintaining a substantially circular shape. This dynamic capability enables the aperture to adapt to different optical requirements without compromising shape accuracy.
2Manufacturing precision
If larger image sensors are used to provide better image quality, then the image quality improves, but background blurring increases and the optical system becomes larger
Solution Approach 1:
The aperture size parameter is made variable through the rotatable blade mechanism, allowing dynamic adjustment of the f-number. By changing the aperture size parameter, the system can optimize the balance between image quality and background blurring effects without requiring physical changes to the lens or sensor size, thereby maintaining a compact optical system.
3Illumination intensity
If the aperture size is increased to allow more light entering the lens, then the brightness improves, but the background blurring effect increases
Solution Approach 1:
The aperture size is made dynamically adjustable through blade rotation, enabling real-time control of light quantity and background blurring effects. This dynamic adjustment capability allows the system to optimize the trade-off between illumination intensity and depth of field control based on specific shooting requirements, achieving both bright imaging and controllable background effects.
Data Source
AI summary
An optical lens module includes a lens element and an adjustable aperture module disposed at object side of the lens element, and the adjustable aperture module includes a blade assembly and a driving component. The blade assembly includes rotatable blades disposed around an optical axis of the lens element to form a light passing aperture. Each rotatable blade includes a rotatable portion and a light blocking portion. The light blocking portion extends and tapers away from the rotatable portion. The rotatable portion has a positioning hole and a dynamic hole. The positioning hole enables rotation of the rotatable blade, and the dynamic hole is disposed close to the positioning hole. The driving component includes a rotatable element corresponding to the dynamic holes to rotate the rotatable blades, to thereby vary aperture size. The light blocking portion includes a protruding segment which extends and tapers toward the light passing aperture.