Eight-Lens Camera Optical Lens Design for Ultra-Thin Wide-Angle Aperture
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Solution Overview
Problem
Current camera lenses with an eight-piece structure face challenges in achieving high optical performance while meeting requirements for ultra-thin, wide-angle lenses with a big aperture, due to irrational settings in refractive power, lens spacing, and lens shape.
Innovation Solution
A camera optical lens design comprising eight lenses, with specific conditions on focal lengths, refractive indices, and curvature radii, balances spherical aberration and field curvature, achieving ultra-thin and wide-angle performance suitable for mobile phone and web camera applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional three-piece to six-piece lens structure is used, then the lens can be simpler in structure, but it cannot achieve high optical performance with ultra-thin, wide-angle, and big aperture requirements
Solution Approach 1:
The lens system is divided into eight separate lens elements with specific refractive powers and shapes. Each lens element (first through eighth lenses) is independently designed with specific curvature radii and thicknesses to correct various optical aberrations. This segmentation allows precise control over light path manipulation to achieve wide-angle, ultra-thin, and big aperture performance while maintaining high optical quality.
Solution Approach 2:
The patent applies specific parameter constraints to resolve the contradiction: the ratio of the focal length of the first lens to the focal length of the lens system is controlled within 4.00≤f1/f≤7.50, the second lens has negative refractive power (f2≤0.00), and the fourth lens has refractive index 1.55≤n4≤1.70. These parameter optimizations enable the lens to achieve ultra-thin profile, wide field of view, and large aperture while correcting optical aberrations for high imaging quality.
2Reliability
If an eight-piece lens structure is used, then high optical performance can be achieved, but the settings on refractive power, lens spacing and lens shape are irrational, preventing achievement of ultra-thin, wide-angle, and big aperture requirements
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: controls the focal length ratio (4.00≤f1/f≤7.50), sets the second lens with negative refractive power (f2≤0.00), and specifies the fourth lens refractive index (1.55≤n4≤1.70). These parameter changes enable the eight-piece lens to achieve ultra-thin profile while maintaining high optical performance and wide-angle capability with large aperture.
Solution Approach 2:
The patent transitions from conventional lens design to ultra-thin design by optimizing the distribution of lens thickness and spacing across the optical axis. The specific configuration of eight lens elements with controlled thicknesses and air gaps creates a compact, ultra-thin form factor while preserving optical performance through careful dimensional management in the axial direction.
3Reliability
If an eight-piece lens structure is used, then high optical performance can be achieved, but the settings on refractive power, lens spacing and lens shape are irrational, preventing achievement of wide-angle and big aperture requirements
Solution Approach 1:
The patent employs specific parameter constraints to achieve both high optical performance and wide-angle, big aperture capability: the focal length ratio (4.00≤f1/f≤7.50) controls the overall optical power distribution, the negative refractive power of the second lens (f2≤0.00) expands the field of view, and the refractive index of the fourth lens (1.55≤n4≤1.70) optimizes light bending for large aperture performance. These parameter optimizations enable simultaneous achievement of multiple design goals.
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 effectively corrects on-axis and off-axis aberrations, leading to improved imaging quality and a larger aperture, making it suitable for high-pixel CCD and CMOS imaging elements.
Implementation Method 1
1.55≤n4≤1.70, where n4 denotes a refractive index of the fourth lens
Data Source
AI summary
The present invention relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, 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; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 4.00≤f1/f≤7.50; f2≤0.00; and 1.55≤n4≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n4 denotes a refractive index of the fourth lens. The present invention can achieve high optical performance while achieving ultra-thin, wide-angle lenses having a big aperture.