Compact Camera Lens Design Aberration Correction
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Solution Overview
Problem
Existing camera lenses with eight lenses fail to achieve a balance of small height, wide angle, and good optical properties due to insufficient ratios of Abbe numbers and focal lengths, leading to difficulties in correcting on-axis and off-axis aberrations.
Innovation Solution
A camera lens configuration with specific refractive power arrangements and focal length ratios, including conditions such as 3.00≤v1/v2≤5.00, 3.00≤v1/v3≤5.00, 0.06≤d10/f≤0.12, −0.35≤f1/f2≤−0.10, and 3.00≤f7/f≤25.00, optimizing the power configuration of each lens and their ratios to achieve a small height and wide angle while maintaining good optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the camera lens uses a conventional eight-lens configuration, then the optical system can be constructed, but the height (TTL) becomes too large and the angle of view becomes limited
Solution Approach 1:
The patent applies parameter changes by optimizing the Abbe number ratios (v1/v2, v1/v3) and focal length ratios (f1/f2, f7/f) of the lens elements. By carefully selecting glass materials with specific Abbe numbers and configuring the focal lengths within defined ranges, the patent achieves a compact lens design with reduced height while expanding the angle of view to 80 degrees or more, resolving the contradiction between compact size and wide-angle capability
2Length of moving object
If the camera lens reduces the height and increases the angle, then the optical path is shortened, but the aberration correction becomes insufficient
Solution Approach 1:
The patent applies local quality by assigning specific refractive power characteristics to different lens elements. The first lens has positive refractive power, the second and third have negative refractive power, and subsequent lenses have alternating powers. This localized differentiation of optical properties allows each lens element to contribute specifically to correcting particular aberrations, maintaining high optical performance despite the compact design
3Ease of manufacture
If the Abbe number ratios and focal length ratios are not optimized, then the lens design is simpler, but the height reduction and optical performance are insufficient
Solution Approach 1:
The patent establishes specific parameter ranges for Abbe number ratios (3.00≤v1/v2≤5.00, 3.00≤v1/v3≤5.00) and focal length ratios (−0.35≤f1/f2≤−0.10, 3.00≤f7/f≤25.00). These parameter specifications provide clear design guidelines that balance manufacturing feasibility with achieving the target height reduction and optical performance, making the complex design process more manageable
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 solution enables a camera lens with a small height-to-image height ratio of less than 1.35, a wide angle of over 80°, and improved optical performance by effectively correcting aberrations, making it suitable for portable module cameras with high-pixel CCD or CMOS imaging elements.
Implementation Method 1
a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a positive or negative refractive power, a fourth lens L4 having a positive refractive power, a fifth lens L5 having a positive or negative refractive power, a sixth lens L6 having a positive or negative refractive power, a seventh lens L7 having a positive refractive power and an eighth lens L8 having a negative refractive power that are arranged in this order from the object side to the image side
Data Source
AI summary
The present invention provides a camera lens consisting of eight lenses and having a small height, a wide angle, and good optical properties. The camera lens includes, sequentially from an object side, a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens; a fourth lens having a positive refractive power; a fifth lens; a sixth lens; a seventh lens having a positive refractive power; and an eighth lens having a negative refractive power. The camera lens satisfies specific conditions.