Seven-Lens Camera Optical Lens with Mixed Plastic Glass Materials
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Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with excellent optical characteristics and fully corrected chromatic aberration, particularly for handheld devices and digital cameras, as the demand for miniature lenses with high imaging quality increases with shrinking pixel sizes and advancing semiconductor technology.
Innovation Solution
A camera optical lens configuration comprising seven lenses made of different materials (plastic and glass) with specific focal lengths, refractive powers, and curvature radii, optimized to achieve ultrathinness and wide-angle capabilities while maintaining high imaging performance, including conditions such as -10≤f1/f≤−3.1, 1.7≤n3≤2.2, 1.7≤n5≤2.2, 1≤f6/f7≤10, and 2.1≤(R1+R2)/(R1−R2)≤10, which balances refractive power and curvature to correct aberrations.
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
Solution Approach 1:
The lens is divided into seven separate lens elements with different materials and optical powers, arranged in specific groups. This segmentation allows each element to correct specific aberrations while maintaining overall imaging quality, resolving the contradiction between simple structure and high imaging quality.
2Manufacturing precision
If more lens elements are added (five-piece, six-piece, seven-piece structure), then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
Different lens elements use different materials (plastic or glass) with specific refractive indices and Abbe numbers selected to correct specific types of aberrations in specific regions of the optical path. This local optimization allows high imaging quality with a manageable number of elements.
Solution Approach 2:
The lens system combines plastic and glass materials with different optical properties. Plastic elements provide cost-effectiveness and specific refractive properties, while glass elements provide superior aberration correction. This composite approach achieves high imaging quality without requiring all seven elements to be complex glass lenses.
3Length of moving object
If the lens is made thinner, then the device dimensions are reduced, but the optical performance deteriorates
Solution Approach 1:
The patent specifies precise parameter ranges for focal lengths, refractive indices, Abbe numbers, and surface curvatures of each lens element. By optimizing these parameters within defined ranges, the system achieves high optical performance in a thin form factor. The conditional expressions ensure that the thin lens maintains proper optical power distribution and aberration correction.
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 lens configuration results in a camera optical lens that is ultra-thin, with fully corrected chromatic aberration, suitable for high-pixel imaging elements, offering excellent optical properties and wide-angle capabilities suitable for mobile and web camera applications.
Implementation Method 1
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 glass material, the sixth lens is made of plastic material, and the seventh lens is made of plastic material
Data Source
AI summary
The present disclosure relates to optical lens, in particular to a camera optical lens. The camera optical lens includes, 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, a sixth lens and a seventh 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 glass material, the sixth lens is made of plastic material, and the seventh lens is made of plastic material. The camera optical lens satisfies the following conditions: −10≤f1/f≤−3.1, 1.7≤n3≤2.2, 1.7≤n5≤2.2, 1≤f6/f7≤10, and 2.1≤(R1+R2)/(R1−R2)≤10. The camera optical lens can obtain high imaging performance and a low TTL (Total Track Length).