Eight-Lens Camera System for Ultra-Thin Wide-Angle Bright Imaging
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Solution Overview
Problem
Existing camera lenses with eight lenses struggle to achieve a balance of ultra-thinness, wide angle, and low F-number (Fno) while effectively correcting aberrations, particularly with Fno≤1.45, as they often result in total track length (TTL)/image height (IH)>1.90, which is not ultra-thin enough.
Innovation Solution
A camera lens design comprising eight lenses with specific refractive powers and curvature radius ratios, including a glass flat plate between the 8th lens and the image surface, optimized by conditional formulas to achieve TTL/IH≤1.65, a wide angle of 70° or more, and Fno≤1.45, using aspherical surfaces to correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the F-number is reduced to achieve a bright lens (Fno≤1.45), then the lens aperture increases and light gathering ability improves, but the total track length increases (TTL/IH>1.90), making the lens not ultra-thin
Solution Approach 1:
The lens system is divided into eight individual lens elements with alternating positive and negative refractive powers. This segmentation allows each element to contribute differently to the overall optical performance, enabling the achievement of Fno≤1.45 while controlling the total track length to TTL/IH≤1.65 through optimized distribution of optical power across multiple elements.
Solution Approach 2:
The patent applies specific parameter constraints to achieve the desired optical performance: (1) 0.20≤R1/R2≤0.50, (2) 1.00≤R3/R4≤1.40, (3) 0.10≤f1/f≤1.50, (4) −8.00≤f2/f≤−5.00, (5) −8.00≤f3/f≤−5.00, (6) −3.00≤R13/R14≤−1.00, and (7) −3.00≤R15/R16≤−1.00. These parameter optimizations enable simultaneous achievement of bright F-number (Fno≤1.45) and ultra-thin profile (TTL/IH≤1.65).
2Length of moving object
If the lens is made ultra-thin (TTL/IH≤1.65) with wide angle (2ω≥70°), then the appearance is compact and modern, but correcting aberrations becomes more difficult
Solution Approach 1:
The lens system uses eight segmented elements with alternating positive and negative refractive powers. This segmentation provides sufficient degrees of freedom to correct various aberrations including spherical aberration, coma, and distortion while maintaining the ultra-thin profile of TTL/IH≤1.65 and wide angle of view of 2ω≥70°.
Solution Approach 2:
The patent employs aspherical surfaces on certain lens elements to effectively correct aberrations. The aspherical shapes allow for better control of light rays across the wide field of view (2ω≥70°) while maintaining the compact ultra-thin form factor, overcoming the limitations of traditional spherical surfaces in wide-angle ultra-thin lens designs.
3Illumination intensity
If eight lenses are used to achieve bright F-number and wide angle, then optical performance improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple functions into the eight-lens system, where each lens element serves both to contribute to the overall focal length and F-number achievement while simultaneously participating in aberration correction. This merging of functions across eight elements achieves bright Fno≤1.45 and wide angle 2ω≥70° without excessive complexity, as each element is optimized for multiple purposes.
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 excellent optical characteristics, an ultra-thin appearance, and a wide angle with a bright F-number, effectively correcting on-axis and off-axis color aberrations, as demonstrated in various embodiments.
Implementation Method 1
refractive powers of respective lenses from a 1st lens to an 8th lens are (positive, negative, positive, negative, positive, negative, negative, negative)
Implementation Method 2
using aspherical surfaces to correct aberrations
Data Source
AI summary
The present disclosure provides a camera lens, constituted by eight lenses, and featuring excellent optical characteristics, an ultra-thin appearance, a wide angle and a bright Fno. The camera lens is configured with, sequentially from an object side: a 1st lens having a positive refractive power, a 2nd lens having a negative refractive power, a 3rd lens having a negative refractive power, a 4th lens having a positive refractive power, a 5th lens having a negative refractive power, a 6th lens having a positive refractive power, a 7th lens having a positive refractive power and an 8th lens having a negative refractive power, and satisfies specified conditional formulas.