Eight-Lens Camera Module Compact Height Wide Angle Aberration Correction
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Solution Overview
Problem
Existing camera lenses with eight lenses fail to achieve a balance between small height, wide angle, and good optical properties due to insufficient differences in Abbe numbers between consecutive lenses, leading to inadequate correction of on-axis and off-axis aberrations.
Innovation Solution
A camera lens design with specific refractive power configurations and curvature radius ratios between lenses, including a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and subsequent lenses with varying refractive powers, satisfying conditions such as 5.00≤v1−v2≤20.00 and 20.00≤v2−v3≤30.00 for Abbe numbers, and 0.30≤R3/R4≤0.50 for curvature radius ratios, to achieve a small height and wide angle while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Abbe numbers of consecutive lenses are made similar, then the lens structure is simpler, but the correction of on-axis and off-axis aberrations is insufficient
Solution Approach 1:
The patent applies parameter changes by establishing specific difference ranges between Abbe numbers of consecutive lenses (5.00≤v1−v2≤20.00 and 20.00≤v2−v3≤30.00). This controlled variation in material parameters enables effective aberration correction while maintaining manufacturability, resolving the contradiction between manufacturing simplicity and optical performance.
2Length of moving object
If the height of the camera lens is reduced, then the portability is improved, but the angle of view and optical properties deteriorate
Solution Approach 1:
The patent employs parameter changes by optimizing multiple geometric and optical parameters simultaneously, including curvature radius ratios (0.30≤R3/R4≤0.50), center thickness ratios (4.00≤(d1+d3)/d2≤12.00), and refractive power distributions. These coordinated parameter adjustments enable the lens to achieve a compact height while maintaining a wide angle of view and excellent optical properties.
Solution Approach 2:
The patent applies the counterweight principle through the alternating arrangement of positive and negative refractive power lenses. This configuration balances the optical powers to achieve a compact overall height while correcting aberrations and maintaining a wide angle of view, effectively counteracting the trade-off between size reduction and performance.
3Adaptability or versatility
If the curvature radius ratio R3/R4 is increased, then the lens design flexibility is improved, but the correction of field curvature and distortion worsens
Solution Approach 1:
The patent applies parameter changes by establishing a specific range for the curvature radius ratio (0.30≤R3/R4≤0.50). This controlled parameter optimization enables effective correction of field curvature and distortion while preserving necessary design flexibility for achieving compact dimensions and wide angle of view.
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 results in a camera lens with a small height-to-image height ratio of less than 1.35, a wide angle of over 80°, and excellent optical properties, effectively correcting spherical aberration, field curvature, and distortion.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power
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 positive refractive power; a third lens having a negative refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; a seventh lens having a positive or negative refractive power; and an eighth lens having a negative refractive power. The camera lens satisfies specific conditions.