Eight-Lens Camera Module for Ultra-Thin Wide-Angle 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 on-axis and off-axis color aberrations, particularly with Fno ≤ 1.45, as they often result in total track length (TTL)/image height (IH) ratios greater than 1.90.
Innovation Solution
A camera lens design comprising eight lenses with specific refractive power configurations and focal length ratios, including a glass flat plate between the 8th lens and the image surface, optimized to satisfy conditional formulas for focal length ratios and refractive powers, ensuring a positive refractive power for the 1st lens, negative refractive power for the 2nd lens, and negative refractive power for the 3rd lens, which corrects aberrations and achieves an Fno ≤ 1.45, TTL/IH ≤ 1.65, and a wide angle of 70° or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a camera lens is designed with eight lenses to achieve a bright F-number (Fno ≤ 1.60), then the F-number is improved, but the total track length to image height ratio (TTL/IH) becomes greater than 1.90, making it not ultra-thin
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers and focal length ratios of the eight lenses. Specifically, it sets the refractive powers of lenses 1-8 in specific sequences and defines focal length ratios (f1/f2, f1/f3, f2/f3) within precise ranges. This systematic parameter optimization enables achieving Fno ≤ 1.45 while reducing TTL/IH to 1.65 or less, resolving the contradiction between brightness and thickness.
2Area of moving object
If a camera lens is designed with eight lenses to achieve a wide angle (field of view ≥ 70°), then the field of view is improved, but the total track length to image height ratio (TTL/IH) becomes greater than 1.90, making it not ultra-thin
Solution Approach 1:
The patent achieves wide angle (2ω ≥ 70°) with ultra-thin profile (TTL/IH ≤ 1.65) by systematically optimizing lens parameters. It specifies refractive power sequences for the eight lenses and defines critical focal length ratios (f1/f2 between -0.12 and -0.06, f1/f3 between -0.15 and -0.07, f2/f3 between 0.85 and 1.15). These parameter constraints enable simultaneous achievement of wide field of view and compact form factor.
3Length of stationary object
If a camera lens is designed to achieve ultra-thin appearance (TTL/IH ≤ 1.65) and wide angle (2ω ≥ 70°), then the form factor is improved, but the F-number becomes greater than 1.45, reducing brightness
Solution Approach 1:
The patent resolves the contradiction between ultra-thin form factor (TTL/IH ≤ 1.65) and brightness (Fno ≤ 1.45) through precise parameter control. It defines specific refractive power sequences for all eight lenses and establishes tight ranges for focal length ratios. This systematic parameter optimization enables simultaneous achievement of compact size, wide angle, and high brightness that were previously unattainable.
4Length of stationary object
If a camera lens is designed to achieve ultra-thin appearance (TTL/IH ≤ 1.65) and wide angle (2ω ≥ 70°), then the form factor is improved, but on-axis and off-axis color aberrations cannot be effectively corrected
Solution Approach 1:
The patent achieves effective aberration correction in an ultra-thin design by optimizing lens parameters. It specifies refractive power sequences and focal length ratios that simultaneously control optical performance and physical dimensions. The parameter optimization includes setting f1/f2 between -0.12 and -0.06, f1/f3 between -0.15 and -0.07, and f2/f3 between 0.85 and 1.15, which enables correction of on-axis and off-axis color aberrations while maintaining TTL/IH ≤ 1.65.
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, a wide angle, and a bright F-number, effectively correcting on-axis and off-axis color aberrations, while maintaining a compact form factor.
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)
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.