Super-Wide Angle Lens Using Plastic Aspherical Elements
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Solution Overview
Problem
The challenge is to create a super-wide angle lens with a viewing angle of 100° or more that is small in size, light in weight, and low in cost, while maintaining high resolution, as existing plastic lenses struggle to correct chromatic aberration effectively, requiring multiple lenses and increasing size and weight.
Innovation Solution
A super-wide angle lens composed of four-group five-lenses, with at least four lenses being plastic and featuring multiple aspherical surfaces, including cemented aspherical surfaces, to correct chromatic aberration efficiently, using specific conditional expressions to optimize lens design and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic lenses are used to reduce size, weight, and cost, then manufacturing cost and weight are reduced, but chromatic aberration correction capability deteriorates
Solution Approach 1:
The patent employs a composite lens structure where plastic lenses are combined with aspherical surfaces and specific optical designs to achieve both cost reduction and aberration correction. The fourth and fifth lenses are made of plastic material while incorporating aspherical surfaces to correct chromatic aberration, creating a composite solution that balances material advantages with optical performance.
Solution Approach 2:
The patent introduces aspherical surfaces on multiple lenses (at least four of five lens faces are aspherical) to correct chromatic aberration in plastic lenses. The aspherical surfaces compensate for the limitations of plastic materials by providing additional degrees of freedom in optical design, enabling effective aberration correction while maintaining plastic lens advantages.
2Manufacturing precision
If multiple lenses are combined to correct chromatic aberration, then chromatic aberration correction is improved, but device complexity, size, and weight increase
Solution Approach 1:
The patent divides the lens system into four groups with five lenses, where each lens serves a specific function in the overall aberration correction scheme. The segmentation allows distributed correction of chromatic aberration across multiple elements rather than requiring a single complex lens, reducing overall system complexity while maintaining correction effectiveness.
Solution Approach 2:
The patent designs the lens system where multiple lenses serve dual purposes: correcting chromatic aberration while simultaneously contributing to overall image formation and other aberration corrections. This multi-functionality reduces the need for dedicated correction lenses, minimizing the total number of elements required.
3Manufacturing precision
If glass lenses are used to correct chromatic aberration, then chromatic aberration correction is improved, but weight and cost increase
Solution Approach 1:
The patent changes the material parameter from glass to plastic for the fourth and fifth lenses, accepting the inherent limitations of plastic materials but compensating through aspherical surface design and optimized lens configurations. This parameter change reduces weight and cost while maintaining chromatic aberration correction through alternative design approaches.
4Adaptability or versatility
If a wide viewing angle of 100° or more is achieved, then field of view is improved, but chromatic aberration becomes more difficult to correct
Solution Approach 1:
The patent addresses the increased chromatic aberration difficulty in wide-angle designs by introducing aspherical surfaces, adding a dimensional complexity to the lens faces. This allows correction of aberrations that become more pronounced at wide angles without requiring additional lens elements, maintaining a compact wide-angle design.
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 configuration allows for a compact, lightweight, and cost-effective super-wide angle lens with high resolution, capable of achieving viewing angles up to 180°, effectively correcting chromatic aberration and maintaining image quality across various conditions, including near-infrared zones.
Implementation Method 1
at least four lens faces, preferably six lens faces of the totaled nine lens faces are aspherical surfaces and thus chromatic aberration of magnification can be corrected with a fewer lenses
Implementation Method 2
one of the at least four lens faces which are the aspherical surfaces is a cemented surface of a cemented lens
Data Source
AI summary
A super wide angle lens is a super wide angle lens which is of high-resolution and whose size, weight and cost can be reduced. It employs a four-group five-element constitution in which in the order from an object side, a meniscus single lens having a negative power, a single lens having a negative power, a single lens having a positive power, and a cemented lens having a positive power are included. The lenses excluding the meniscus single lens are plastic lenses and seven lens surfaces, that are a third surface, a fourth surface, a fifth surface, a sixth surface, a eighth surface, a ninth surface and a tenth surface, are aspheric.