Junction Compound Lens for High-Temperature Optical Stability
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Solution Overview
Problem
Conventional imaging lenses in portable telephones face challenges in maintaining optical performance at high temperatures and achieving optimal optical characteristics such as short optical length and long back focus, while also correcting aberrations and ensuring heat resistance.
Innovation Solution
The imaging lens design incorporates a junction type compound lens with a positive refractive power, comprising a sequence of lenses made from curable resin and high softening temperature optical glass materials, with specific refractive index and Abbe number conditions, and uses indirect bonding with an adhesive to minimize reflection and maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat resistant socket component is used to protect the imaging lens during reflow processing, then the optical performance is maintained, but the manufacturing steps become complicated and manufacturing cost increases
Solution Approach 1:
The patent extracts the heat resistant function from a separate socket component and integrates it directly into the imaging lens structure. The lens barrel is made of heat resistant material, eliminating the need for a separate heat resistant socket, thus simplifying the manufacturing process while maintaining optical performance during reflow processing
Solution Approach 2:
The patent combines the protective function of the socket with the structural function of the lens barrel by making the lens barrel itself from heat resistant material. This merging eliminates the separate socket component and reduces assembly steps while maintaining the same protective effect during reflow processing
2Reliability
If a heat resistant socket component is used to protect the imaging lens during reflow processing, then the optical performance is maintained, but the manufacturing cost increases
Solution Approach 1:
The patent removes the separate heat resistant socket component from the bill of materials and integrates its function into the lens barrel. This reduces component count and assembly operations, directly lowering manufacturing cost while maintaining optical performance protection during reflow processing
Solution Approach 2:
The patent merges the protective function with the lens barrel structure, eliminating the need for a separate socket component. This consolidation reduces both material costs and assembly costs while maintaining the same level of protection for the imaging lens during high-temperature reflow processing
3Length of moving object
If the optical length is shortened to meet portable telephone thickness requirements, then the device becomes more compact, but the back focus becomes shorter making it difficult to insert filter and cover glass
Solution Approach 1:
The patent uses aspherical lens surfaces to change the dimensional characteristics of light propagation. The aspherical surfaces allow for shorter optical length while maintaining adequate back focus distance by controlling refraction in multiple dimensions, enabling both compact form factor and proper insertion space for filter and cover glass
4Ease of manufacture
If a conventional plastic imaging lens is used, then the manufacturing cost is low, but the optical performance deteriorates in high temperature environments of 150°C or higher
Solution Approach 1:
The patent changes the material parameter of the lens barrel from conventional plastic to heat resistant material. This parameter change enables the lens to maintain its optical performance in high temperature environments (150°C or higher) while still being manufacturable at reasonable cost through integrated design that eliminates separate socket 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
This design ensures the imaging lens maintains optical performance and heat resistance at high temperatures, achieves a short optical length and long back focus, and effectively corrects aberrations, resulting in high-quality images.
Implementation Method 1
the first lens and the second lens are indirectly bonded, and the second lens and the third lens are indirectly bonded
Data Source
AI summary
An imaging lens of which optical performance does not deteriorate even in a high temperature environment, various aberrations are well corrected, optical length is short, and back focus is sufficiently secured; the imaging lens comprising: an aperture stop S; and a junction type compound lens 14 having a positive refractive power, characterized in that the aperture stop and the compound lens are arranged in this sequence from an object side to an image side. The junction type compound lens comprises a first lens L1, a second lens L2 and a third lens L3, arranged in this sequence from the object side to the image side. The first lens and the third lens are formed of a curable resin material, and the second lens is formed of a high softening temperature optical glass material. The first lens and the second lens are bonded with adhesive, and the second lens and the third lens are bonded with adhesive. The object side face of the first lens and the image side face of the third lens are aspherical.