Imaging Lens Assembly Aperture Sheet for Light Source Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging lens assemblies in portable electronic devices face challenges in achieving high-quality imaging performance due to inadequate control of light sources and inconsistent light blocking, particularly in varying lighting conditions.
Innovation Solution
An imaging lens assembly featuring a single-piece-formed light blocking sheet with specific roundness coefficients and alternating light blocking and radius structures, which mimics the functionality of a multi-blade aperture stop, allowing precise control of light entry and preventing excessive light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light blocking sheet is used to control light sources, then light source identifiability is improved, but excessive light blocking occurs reducing imaging quality
Solution Approach 1:
The light blocking sheet is divided into multiple light blocking structures (3-10 structures) arranged around the central aperture. Each structure blocks light from specific directions while leaving gaps for light from other directions. This segmentation allows selective light blocking to identify light sources without excessively reducing overall light collection.
Solution Approach 2:
Different regions of the light blocking sheet have different properties: the central aperture region allows maximum light passage for imaging, while the surrounding light blocking structures provide directional light blocking. This local differentiation enables the sheet to simultaneously achieve light source identification and adequate light collection.
2Reliability
If multiple light blocking structures are used to control light, then imaging performance is improved, but device complexity increases
Solution Approach 1:
Multiple light blocking structures are integrated into a single light blocking sheet that is disposed at one location within the lens assembly. This merging of multiple functional elements into a single component achieves the desired imaging performance without proportionally increasing device complexity.
Solution Approach 2:
The light blocking sheet serves multiple functions simultaneously: it blocks light from specific directions for light source identification, allows light passage through the central aperture for imaging, and can be designed with specific roundness coefficients to control optical properties. This multi-functionality reduces the need for separate components.
3Measurement precision
If the light blocking sheet has high roundness coefficient, then light source control is improved, but light blocking becomes excessive
Solution Approach 1:
The roundness coefficient of the light blocking structures is optimized within a specific range (0.41%≤tc≤10.2%) to achieve the desired balance. By adjusting this geometric parameter, the structure achieves sufficient light source control precision while maintaining adequate light transmission for imaging.
Data Source
AI summary
An imaging lens assembly includes a plurality of optical lens elements, a single-piece-formed light blocking sheet and a lens barrel. The lens barrel has a circular light-passing hole corresponding to the plurality of optical lens elements and the single-piece-formed light blocking sheet. The single-piece-formed light blocking sheet has a central aperture corresponding to the lens barrel and the plurality of optical lens elements. A maximum aperture diameter is defined by the central aperture. The single-piece-formed light blocking sheet comprises a plurality of light blocking structures surrounding and disposed adjacent to the central aperture. A minimum inner radius of the central aperture is defined near the center of each of the light blocking structures.