Compact 3-Lens Camera Module for Mobile Devices
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Solution Overview
Problem
Conventional 3-lens picture-taking lenses face challenges in size reduction while maintaining effective aberration correction, with existing designs either compromising on lens length or aberration performance.
Innovation Solution
A 3-lens composition with specific refractive power distributions and lens curvatures, including a positive first lens, a meniscus-shaped second lens, and a negative third lens, optimized by conditional expressions to reduce total length and outer diameter, and incorporating plastic materials for mass production and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a triplet type picture-taking lens with positive-negative-positive refractive power arrangement is used, then wide image angle and aberration correction are achieved, but total lens length becomes comparatively long
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and spacing of the three lenses to achieve a balanced configuration. Specifically, the first lens has positive refractive power with optimized curvature, the second lens has negative refractive power with specific curvature values, and the third lens has positive refractive power, with all parameters carefully selected to reduce total length while maintaining aberration correction capability.
Solution Approach 2:
The patent employs composite lens design combining different refractive index materials in the three lens elements. By selecting materials with appropriate refractive indices and Abbe numbers for each lens position, the system achieves effective aberration correction across the visible spectrum while maintaining a compact form factor suitable for mobile devices.
2Length of stationary object
If a tele-photo type picture-taking lens with positive-positive-negative refractive power arrangement is used, then total lens length is reduced, but there is scope for further size reduction
Solution Approach 1:
The patent optimizes parameters including the refractive powers of each lens element, the air gaps between lenses, and the curvatures of lens surfaces to achieve a compact tele-photo configuration. The specific parameter ranges defined in the patent ensure that the lens maintains short total length while correcting spherical aberration, coma, and field curvature effectively.
3Length of stationary object
If lens size is reduced for mobile phone application, then device compactness is improved, but manufacturing precision and aberration control become more difficult
Solution Approach 1:
The patent defines specific parameter ranges for lens curvatures, thicknesses, and spacing that are optimized for small-form-factor applications. These parameter specifications enable mass production with controlled tolerances while maintaining effective aberration correction, making the design suitable for mobile phone manufacturing.
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 solution achieves a smaller-sized picture-taking lens with improved aberration correction, enabling size and weight reduction of image pick-up apparatus while maintaining high performance, and facilitates cost-effective mass production using plastic lenses.
Implementation Method 1
the first lens having a positive refractive power and directing the convex surface to the object side, an aperture stop, the second lens having a positive refractive power and meniscus shape directing the convex surface to the image side, and the third lens having a negative refractive power and directing the concave surface to the image side
Data Source
AI summary
A picture-taking lens for forming an image of an object image on a solid picture-taking element, comprising in order from the object side: a first lens having a positive refractive power and directing a convex surface toward the object side; an aperture stop, a second lens having a positive refractive power and a meniscus shape directing a convex surface toward the image side; and a third lens having a negative refractive power and directing a concave surface toward the image side, wherein the picture-taking lens satisfies the following conditional expression: 0.20<R1/f<0.42, 0.10<D2/f<0.40, where R1 is a radius of curvature of the object side surface of the first lens, D2 is an air gap on the axis between the first lens and the second lens, f is a focal length of a whole system of the picture-taking lens.