Seven-Lens Camera Module with Aspheric Fifth Element
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Solution Overview
Problem
Existing camera lenses with seven-piece configurations for mobile phone and webcam applications face challenges in achieving ultra-thin, high-luminous flux, and wide-angle optical performance due to insufficient refractive power distribution and improper shape of the fifth lens, leading to inadequate brightness and thickness.
Innovation Solution
A camera lens design comprising seven lenses with specific refractive power distributions and aspheric shapes, including a glass plate or optical filter between the seventh lens and the imaging surface, adhering to condition formulas that optimize focal lengths, refractive powers, and Abbe numbers to correct aberrations and achieve ultra-thin, wide-angle performance with high luminous flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the camera lens uses a seven-piece configuration with conventional refractive power distribution, then the lens can achieve basic optical function, but the brightness (Fno) is insufficient and the lens cannot be sufficiently ultra-thin
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the seven lenses and adjusting the shape parameters (curvature radii, thicknesses, and spacing) of each lens element. Specifically, the fifth lens is redesigned with improved refractive power and aspheric shape parameters to enhance light gathering capability while reducing overall lens thickness, achieving Fno<1.8 and TTL/IH<1.55
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, particularly the fifth lens, to correct aberrations and improve optical performance. The aspheric shape allows for better control of light paths, enabling reduced lens thickness while maintaining high brightness and wide angle of view greater than 75 degrees
2Adaptability or versatility
If the camera lens uses a seven-piece configuration with conventional design, then the lens structure is established, but the total angle of view cannot exceed 75 degrees
Solution Approach 1:
The patent achieves wide angle of view greater than 75 degrees by optimizing key parameters including the focal length of the fifth lens (f5), the spacing between lens elements (d8, d10), and the curvature radii of lens surfaces. These parameter adjustments enable the lens to maintain excellent optical properties while achieving the desired wide angle without increasing device complexity
3Reliability
If the fifth lens has insufficient refractive power and improper shape, then the lens assembly can be manufactured, but the optical performance (brightness and thinness) is inadequate
Solution Approach 1:
The patent specifies precise parameter ranges for the fifth lens including refractive power, aspheric coefficients, thickness, and curvature radii to achieve optimal optical performance. These parameter specifications ensure both excellent brightness (Fno<1.8) and thinness (TTL/IH<1.55) while maintaining manufacturing feasibility through standard optical design practices
Solution Approach 2:
The patent implements aspheric surfaces on the fifth lens with specific curvature radius ranges and aspheric coefficient values to correct aberrations and improve optical performance. The aspheric design enhances light control capability while remaining manufacturable using conventional aspheric lens fabrication techniques
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 excellent optical properties, including a total angle of view greater than 75°, F-number less than 1.8, and a thickness-to-image height ratio less than 1.55, effectively addressing the limitations of previous designs by enhancing brightness and thinness while correcting aberrations.
Implementation Method 1
a first lens with positive refractive power; a second lens with negative refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power, a fifth lens with positive refractive power
Data Source
AI summary
A camera lens is disclosed. The camera lens includes seven piece ultra-thin and high-luminous flux wide angle lenses with excellent optical properties as follows: a first lens with positive refractive power; a second lens with negative refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power; a fifth lens with positive refractive power; a sixth lens with positive or negative refractive power, and a seventh lens with negative refractive power which are arranged in an order from an object side to an image side. The camera lens satisfies specified conditions.