Six-Lens Optical System for Compact Mobile Camera Modules
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Solution Overview
Problem
There is a challenge in manufacturing camera modules for mobile communications terminals with high resolution and performance due to the trend of miniaturization and lightweight design.
Innovation Solution
The optical system comprises six lenses with specific refractive powers and configurations, including a first lens with negative refractive power, a second lens with positive refractive power, and a sixth lens with negative refractive power, along with an image sensor to convert images into electrical signals. The lenses are sequentially disposed from the object side, and the system satisfies various conditional expressions to optimize optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera modules are designed with high resolution and performance, then image quality improves, but device size and weight increase
Solution Approach 1:
The patent applies parameter changes by using plastic material with specific refractive indices (1.5-1.7) and varying Abbe numbers (20-40) for different lenses. The sixth lens is designed with negative refractive power and specific curvature ratios (|r16/r15| between 0.6-1.4) to optimize optical performance while maintaining compact size. These parameter optimizations enable high resolution without proportionally increasing weight.
Solution Approach 2:
The patent employs composite material strategy by using plastic lenses instead of traditional glass lenses. The camera module uses a combination of plastic materials with different optical properties (refractive indices and Abbe numbers) to achieve high resolution performance. This material substitution significantly reduces weight while maintaining or improving image quality through optimized optical design.
2Measurement precision
If camera modules are designed with high resolution and performance, then image quality improves, but device size increases
Solution Approach 1:
The patent optimizes device size through parameter changes in lens design. The sixth lens is configured with negative refractive power and specific curvature ratios (|r16/r15| between 0.6-1.4), and the system satisfies TTL/(ImgH×2)≤0.75. These parameter optimizations enable compact lens arrangement and reduce overall module length while achieving high resolution through plastic material properties.
Solution Approach 2:
The patent applies dimensional optimization by arranging six lenses in a compact sequential configuration from object side to image sensor. The narrow gap design between adjacent lenses (particularly between first-second and second-third lenses) optimizes the optical path density, achieving high resolution within a reduced TTL (total track length) dimension.
3Measurement precision
If six lenses are used to achieve high resolution, then image quality improves, but device complexity increases
Solution Approach 1:
The patent reduces design complexity through systematic parameter optimization. Each lens has specifically optimized parameters (refractive power, curvature ratios, gap dimensions) that work together as a coordinated system. The sixth lens's negative refractive power and curvature ratio constraints, along with the TTL/(ImgH×2)≤0.75 requirement, provide clear design guidelines that simplify the optimization process while achieving high resolution.
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
This configuration improves optical performance by correcting aberrations, achieving a wide field of view, and maintaining a slim construction, thereby enhancing image quality and resolution while addressing the constraints of miniaturization and lightweight design.
Implementation Method 1
an image sensor configured to convert an image of a subject incident through the first to sixth lenses into electrical signals
Data Source
AI summary
An optical system includes: a first lens having negative refractive power; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and an image sensor configured to convert an image of a subject incident through the first to sixth lenses into electrical signals, wherein the first to sixth lenses are sequentially disposed from an object side of the optical system, and wherein TTL/(ImgH*2)≤0.75 is satisfied, with TTL being a distance from an object-side surface of the first lens to an image plane of the image sensor and ImgH being half of a diagonal length of the image plane of the image sensor.