Compact Lens Module with Inflection Points for Slim Mobile Terminals
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Solution Overview
Problem
High-resolution lens modules for mobile communications terminals face challenges in miniaturization due to increased length of the optical system, making it difficult to mount them in slim devices.
Innovation Solution
A lens module design incorporating specific lens configurations, including convex and concave surfaces, negative refractive power, and inflection points, optimized to satisfy conditional expressions for overall focal length, image sensor dimensions, and aberration correction, resulting in a compact optical system with a wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lenses are used to configure a high-resolution optical system, then the resolution is improved, but the length of the optical system increases
Solution Approach 1:
The patent implements a nested lens configuration where lenses are arranged in a compact stacked structure. The first lens is positioned closest to the object side, followed by the second lens, third lens, and fourth lens in sequence, with each lens nested within the optical path of the previous one. This nesting arrangement allows multiple lenses to be integrated within a short overall length while maintaining high resolution capabilities.
Solution Approach 2:
The patent transitions from a conventional linear arrangement of lenses to a multi-dimensional compact structure. By optimizing the spatial distribution of lenses in three-dimensional space and using aspheric surfaces, the system achieves high resolution without increasing the overall length proportionally. The aspheric surfaces enable better light path management in the compact configuration.
2Length of stationary object
If the optical system length is decreased for miniaturization, then the device can be mounted in slim mobile terminals, but the aberration correction becomes more difficult
Solution Approach 1:
The patent applies different surface curvatures and aspheric coefficients to different regions of the lenses. Each lens is designed with specific local optical properties - for example, the first lens has a convex object-side surface and convex image-side surface, while the second lens has a concave image-side surface. This localized optimization of surface geometry enables effective aberration correction within the compact overall length.
Solution Approach 2:
The patent utilizes aspheric surfaces with specific conic constants and aspheric coefficients to control optical aberrations. By carefully selecting and adjusting these parameters for each lens element, the system achieves excellent aberration correction despite the reduced overall length. The aspheric coefficients are optimized to balance compactness with optical performance.
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 a compact lens module with high resolution and wide field of view, satisfying conditional expressions for miniaturization and aberration correction, allowing for efficient photography of wide backgrounds while maintaining a short overall length.
Implementation Method 1
a first lens including a convex object-side surface and a convex image-side surface; a second lens including a concave image-side surface; a third lens including a concave object-side surface; a fourth lens having negative refractive power
Data Source
AI summary
A lens module includes: a first lens including a convex object-side surface and a convex image-side surface; a second lens including a concave image-side surface; a third lens including a concave object-side surface; a fourth lens having negative refractive power, and including a concave object-side surface; and a fifth lens having negative refractive power and including an image-side surface having one or more inflection points and a convex object-side surface. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are sequentially disposed in a direction from an object side of the lens module. The expression f/ImgH<1.3 is satisfied, with f being an overall focal length of an optical system including the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and with ImgH being half of a diagonal length of an image sensor.