Lens Assembly Baffle Ring Pouring Method
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Solution Overview
Problem
During lens assembly, air gas cavities and surface eccentricities can occur between adjacent lenses, leading to optical axis tilting and inaccurate thickness, resulting in low production yield.
Innovation Solution
A lens assembly comprising a first lens, a second lens, and a baffle ring, where the optical axes of the lenses coincide, and a pouring space is formed between the lenses and the baffle ring to pour and solidify a pouring material, forming a third lens with reduced gas cavities and improved yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid optical adhesive is used to bond adjacent lenses, then the lenses can be assembled together, but air gas cavities and surface eccentricities occur between optical surfaces leading to optical axis tilting
Solution Approach 1:
The baffle ring is pre-assembled with the first lens to establish a fixed reference frame before the second lens is positioned. This preliminary action ensures that the optical axes are pre-aligned, preventing tilting during the bonding process with liquid optical adhesive.
Solution Approach 2:
The baffle ring acts as an intermediary component between the first and second lenses. It provides a mechanical reference structure that guides the positioning of the second lens, ensuring optical axis coincidence while allowing the use of liquid optical adhesive for bonding.
2Ease of manufacture
If liquid optical adhesive is used for bonding, then the lenses can be joined, but the thickness of the lens assembly becomes inaccurate due to poor fitting
Solution Approach 1:
The baffle ring serves as a thickness reference intermediary. Its inner surface is precisely positioned relative to the first lens, providing a fixed reference plane that ensures accurate thickness control when the second lens is bonded using liquid optical adhesive.
Solution Approach 2:
The spacing and thickness parameters are predetermined during the baffle ring design and assembly phase. This preliminary establishment of geometric parameters ensures that the final lens assembly achieves the required thickness accuracy, compensating for the variable nature of liquid adhesive bonding.
3Device complexity
If traditional bonding methods are used, then the assembly process is simple, but the production yield is low due to gas cavities and optical axis tilting
Solution Approach 1:
The baffle ring intermediary structure provides mechanical reference and positioning functions that significantly improve bonding accuracy and reduce defects like gas cavities and optical axis tilting. This moderate increase in structural complexity leads to substantial improvements in production yield by ensuring consistent assembly quality.
Data Source
AI summary
A lens assembly comprises a first lens, a second lens, a third lens and a baffle ring. The first lens comprises a first surface. The second lens comprises a second surface, in an assembly direction, the first surface is spaced from the second surface. The baffle ring is positioned between the first lens and the second lens, the baffle ring comprises a first end and a second end, the first end is connected to the first surface, the second end is connected to the second surface, a pouring space is formed between the first surface, the second surface and an inner surface of the baffle ring. And the third lens is formed by solidifying a pouring material poured into the pouring space. The application can improve the production yield of the lens assembly.