Optical Lens Assembly Light Blocking Sheet Composite Structure
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Solution Overview
Problem
Current light blocking sheets in imaging lens modules are ineffective in blocking unnecessary light under high-intense sources, leading to fake lens flare issues, and their connecting structures with lens elements are unstable, prone to deformation under external forces.
Innovation Solution
An optical lens assembly with lens elements featuring connecting structures that include circular conical surfaces and a light blocking sheet with a polygonal opening, where the light blocking sheet is received in a receiving space between the lens elements, providing precise light blocking and stability through a composite structure with a plastic substrate layer and carbon-containing surface layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional light blocking sheet is used between lens elements, then the structure is simple, but the light blocking effect is insufficient under high-intense light sources causing fake lens flare
Solution Approach 1:
The light blocking sheet uses a composite structure with a plastic substrate layer and carbon-containing surface layers (first and second carbon-containing layers). This composite material configuration enhances the light blocking effect under high-intense light sources while maintaining structural integrity and preventing fake lens flare, resolving the contradiction between effective light blocking and structural simplicity.
2Reliability
If the light blocking sheet is directly connected to lens elements, then the assembly is simple, but the connecting structure is unstable and prone to deformation under external forces
Solution Approach 1:
The connecting structure incorporates a circular conical surface that fits into a corresponding receiving space. This curved geometric design provides stable mechanical engagement between the light blocking sheet and lens elements, preventing deformation under external forces while maintaining a relatively simple assembly process.
3Object-affected harmful factors
If the light blocking sheet has a larger size to block more light, then the light blocking effect improves, but the structural stability and precision of positioning deteriorates
Solution Approach 1:
The light blocking sheet features a polygonal opening with specific geometric characteristics (external angle θ between 9.0° and 81.0°) that is precisely positioned within the sheet. This localized precise geometry ensures accurate positioning and stable connection while the overall sheet size is optimized to provide sufficient light blocking coverage without compromising positioning precision.
Data Source
AI summary
An optical lens assembly includes at least two lens elements and at least one light blocking sheet. Each of the lens elements includes a connecting structure for aligning the two lens elements. Each of the connecting structures includes a connecting surface and a circular conical surface, and a receiving space is formed between the two lens elements. A vertical distance between the receiving space and an optical axis is shorter than a vertical distance between each circular conical surface and the optical axis. The light blocking sheet is received in the receiving space and has a polygonal opening, and an outside diameter of the light blocking sheet is smaller than or equal to a minimum diameter of each circular conical surface.