Eight-Lens Camera Module Compact Height Wide Angle
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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 refractive index and Abbe number of the second lens, leading to difficulties in correcting on-axis and off-axis aberrations.
Innovation Solution
A camera lens configuration with specific refractive index and Abbe number ranges for the second lens, along with defined relationships between lens thicknesses and curvature radii, ensures a refractive index of 1.70≤nd2≤1.80 and 40.00≤ν2≤50.00, and ratios such as 4.00≤(d1+d3)/d2≤12.00, 0.30≤R3/R4≤0.50, 3.00≤|R5/R6|≤15.00, and 0.005≤d4/f≤0.010, optimizing the power configuration and curvature radii to achieve a small height and wide angle while maintaining good optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refractive index and Abbe number of the second lens are increased to improve optical properties, then the height reduction and wide angle are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive index (1.70≤nd2≤1.80) and Abbe number (40.00≤ν2≤50.00) of the second lens, along with specific thickness ratios (4.00≤(d1+d3)/d2≤12.00) and curvature radius ratios (0.30≤R3/R4≤0.50), to simultaneously achieve compact height and superior optical correction
2Length of moving object
If the lens configuration is optimized to achieve small height and wide angle, then the optical properties deteriorate due to insufficient aberration correction
Solution Approach 1:
The patent applies local quality by assigning specific optical properties to the second lens (refractive index 1.70-1.80, Abbe number 40-50) and configuring its thickness and curvature radii to have different functional characteristics than other lenses, enabling it to specifically correct on-axis and off-axis aberrations while contributing to compact overall height
3Reliability
If the second lens parameters are optimized for aberration correction, then the field of view and height ratio improve
Solution Approach 1:
The patent applies composite materials by combining the second lens with specific refractive index and Abbe number characteristics with other lenses in the eight-lens system, creating a composite optical system that achieves both excellent aberration correction and wide field of view (over 80°) with compact height ratio (less than 1.35)
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 camera lens achieves a small height-to-image height ratio of less than 1.35 and a full field of view over 80° with improved optical performance, effectively correcting aberrations and maintaining good optical quality.
Implementation Method 1
a second lens having a positive refractive power... 1.70≤nd2≤1.80, where nd2 denotes a refractive index of d line of the second lens
Implementation Method 2
40.00≤ν2≤50.00, where v2 denotes an abbe number of the second lens
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.