Six-Lens Camera Optical System with Mixed Glass-Plastic Elements
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Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing demand for better imaging quality require more complex lens structures.
Innovation Solution
A six-piece camera optical lens design is proposed, comprising lenses made of different materials (plastic and glass) with specific refractive powers, Abbe numbers, and curvature radii, optimized to achieve ultra-thin and wide-angle capabilities while correcting aberrations, with conditions such as -3≤f1/f≤-1 for the first lens and v3≥60 for the third lens, and refractive index 1.7≤n6≤2.2 for the sixth lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality deteriorates due to shrinking pixel size and increasing demands
Solution Approach 1:
The patent divides the optical system into six distinct lens elements with specific refractive power distributions (−+++−−). This segmentation allows each lens to be optimized for specific aberration corrections while maintaining overall system performance, resolving the contradiction between structural complexity and imaging quality by using the minimum necessary number of elements.
Solution Approach 2:
Each lens element is assigned specific local properties including refractive index ranges, Abbe number ranges, and curvature radius relationships. For example, the third lens has v3≥60 and the sixth lens has 1.7≤n6≤2.2, allowing targeted correction of chromatic and spherical aberrations in different regions of the optical path.
2Length of moving object
If the lens is made ultra-thin to meet handheld device requirements, then the device size is reduced, but the optical characteristics deteriorate
Solution Approach 1:
The patent employs specific parameter ranges and relationships to achieve ultra-thin design while maintaining optical performance. Key parameters include the focal length ratios (−3≤f1/f≤-1), curvature radius relationships, and refractive index constraints that collectively enable thinness without sacrificing optical characteristics.
Solution Approach 2:
The patent uses a combination of plastic and glass lens materials with specific refractive indices and Abbe numbers. This composite material approach allows optimization of each element's contribution to overall optical performance while maintaining compact thickness, particularly using high-index glass for the sixth lens (1.7≤n6≤2.2).
3Manufacturing precision
If chromatic aberration is fully corrected by increasing lens elements, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The patent assigns specific Abbe number ranges to different lens elements to target chromatic aberration correction at different wavelengths. The third lens (v3≥60) and sixth lens (v6≥30) are specifically designed with high Abbe numbers to correct lateral and longitudinal chromatic aberrations, achieving full correction without excessive complexity.
Solution Approach 2:
The patent uses optimized parameter relationships including focal length ratios, curvature radius relationships, and refractive index combinations to correct chromatic aberration efficiently. The six-element design with −+++−− refractive power distribution achieves complete chromatic aberration correction with minimal elements by carefully controlling these parameters.
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
The design achieves high-performance, ultra-thin lenses with excellent optical characteristics and fully corrected on-axis and off-axis chromatic aberrations, maintaining miniaturization and improving imaging quality.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The second lens L2 has a positive refractive power, and the third lens L3 has a positive refractive power
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of glass material, the fourth lens is made of plastic material, the fifth lens is made of plastic material and the sixth lens is made of glass material. The camera optical lens further satisfies specific conditions.