Eight-Lens Camera Module with Glass Flatplate for Ultra-Thin Wide-Angle Optics
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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) ≤1.45, as they often result in aberrations and are not thin enough with a total track length (TTL)/image height (IH) >1.90.
Innovation Solution
A camera lens design comprising eight lenses with specific refractive powers and focal lengths, including a glass flatplate between the 8th lens and the image surface, optimized with aspherical surfaces and conditional formulas to achieve TTL/IH ≤1.65, a wide angle of 70° or more, and Fno ≤1.45, using a configuration that includes a glass flatplate GF with IR cut-off function.
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 ≤ 1.45), then the illumination intensity is improved, but the total track length (TTL) increases making it not ultra-thin (TTL/IH > 1.90)
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of the lens materials within specific ranges (1.45 ≤ ν4 < 23.53 and 1.6397 < ν5 ≤ 1.707 for the 4th and 5th lenses). This allows achieving Fno ≤ 1.45 while maintaining TTL/IH ≤ 1.65 through precise material selection and optical parameter optimization.
Solution Approach 2:
The patent employs aspherical surfaces on multiple lenses (1st, 2nd, 3rd, 6th, 7th, and 8th lenses) with specific curvature parameters. The aspherical coefficients are optimized to correct aberrations while reducing the total track length, enabling both bright F-number and ultra-thin profile to coexist.
2Length of stationary object
If the lens configuration is optimized for ultra-thinness (TTL/IH ≤ 1.65), then the length is improved, but optical aberrations increase degrading image quality
Solution Approach 1:
The patent applies local quality by assigning specific refractive power signs and material properties to individual lenses: the 4th lens has positive refractive power with specific Abbe number range, the 5th lens has negative refractive power with controlled dispersion. This localized optimization of each lens's properties corrects aberrations while maintaining the ultra-thin overall structure.
Solution Approach 2:
The patent uses composite optical design by combining lenses with different refractive indices and Abbe numbers (e.g., 1.45 ≤ ν4 < 23.53 and 1.6397 < ν5 ≤ 1.707) to create an achromatic doublet effect in the 4th and 5th lenses. This composite approach corrects chromatic and spherical aberrations while keeping the total track length short.
3Area of stationary object
If the lens design achieves wide angle (2ω ≥ 70°), then the field of view is improved, but distortion and aberrations increase
Solution Approach 1:
The patent segments the optical system into eight distinct lenses with specific refractive power distributions (positive, negative, positive, negative, positive, negative, negative, negative). This segmentation allows each lens to contribute to correcting specific types of aberrations while collectively achieving wide angle (2ω ≥ 70°) with controlled distortion.
Solution Approach 2:
The patent makes the lens system multi-functional by designing the 4th and 5th lenses as an achromatic doublet that simultaneously corrects chromatic aberration, spherical aberration, and coma. The aspherical surfaces on multiple lenses provide universal correction for various off-axis aberrations while maintaining wide field 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 achieves excellent optical characteristics, an ultra-thin appearance, and a wide angle with a bright F-number, effectively correcting aberrations and ensuring the lens is both thin and optically superior.
Implementation Method 1
a glass flatplate GF with IR cut-off function
Implementation Method 2
aspherical surfaces
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.