Six-Lens Wide Angle System with Reduced Fifth Lens Power
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Solution Overview
Problem
Existing high-resolution wide angle lens systems for portable devices face challenges in achieving compactness, low sensitivity, and high productivity due to concentrated refractive power on initial lenses, leading to complexity in design and processing, and difficulties in miniaturization which affects image quality and pixel size.
Innovation Solution
A high-resolution wide angle lens system comprising six lenses with carefully designed refractive power and shape distribution, including a fifth lens with reduced refractive power and specific curvature radii, to correct distortion and lower sensitivity, allowing for a compact and lightweight design with a low F-number, facilitating easier performance reproduction and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If refractive power is concentrated on the first lens and the second lens, then high-resolution imaging is achieved, but the sensitivity of the system increases and design becomes complicated
Solution Approach 1:
The patent divides the total refractive power into multiple lenses (first through sixth lenses) rather than concentrating it on just two lenses. Each lens contributes a portion of the total refractive power, which segments the optical function and reduces the sensitivity burden on any single lens, thereby lowering overall system sensitivity while maintaining high-resolution imaging capability
Solution Approach 2:
The patent assigns different refractive power characteristics to different lenses based on their specific positions and functions in the optical system. The first lens has negative refractive power, while subsequent lenses have positive refractive power, creating local optimization of optical properties that balances resolution with reduced sensitivity
2Volume of moving object
If the lens system is miniaturized, then the camera module size is reduced, but the lens thickness decreases making injection molding difficult and lowering productivity
Solution Approach 1:
The patent changes the material parameter by using plastic lenses with high refractive index (greater than 1.5). This parameter change allows the lenses to achieve the required optical power with greater thickness compared to standard refractive indices, making the lenses suitable for injection molding while maintaining the miniaturized camera module size
3Measurement precision
If the pixel size is reduced to 1.12 μm or less, then high-resolution imaging is enabled in smaller devices, but the F-number must be reduced to 2.3 or less which increases design difficulty
Solution Approach 1:
The patent uses six lenses arranged in sequence, with each lens contributing to the overall optical power. This segmentation allows the system to achieve low F-number (2.3 or less) required for small pixel sizes without concentrating all the optical complexity in a single element, distributing the design requirements across multiple lenses
Solution Approach 2:
The patent employs plastic materials with high refractive index (greater than 1.5) for the lenses, which allows achieving the required optical performance for small pixel sizes with a more compact and manageable design, reducing the overall complexity compared to using standard refractive index materials
4Ease of manufacture
If the lens shape is made gentle to facilitate injection, then manufacturing is easier, but achieving the same optical power becomes more difficult
Solution Approach 1:
The patent changes the material parameter by using plastic with high refractive index (greater than 1.5). This allows the lenses to have gentler shapes that are easier to inject while still achieving the required optical power, because the higher refractive index compensates for the reduced curvature
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 enables a high-resolution wide angle lens system that is compact, lightweight, and less sensitive, improving productivity and image quality while maintaining high performance, even with reduced pixel sizes and smaller camera module sizes.
Implementation Method 1
a lens system for realizing functions of high image quality and high performance includes at least three lenses and constitutes an optical system for projecting an image of the subject onto an imaging device by using the multiple lenses
Data Source
AI summary
The present invention relates to a high-resolution wide angle lens system consisting of a total of six lens, wherein the first lens has a negative refractive power, the second lens has a positive refractive power, the third lens has a positive or negative refractive power, the fourth lens has a positive or negative refractive power, the fifth lens has a positive or negative refractive power with a concave shape on an object side and a convex shape on an image side, and the sixth lens has a positive or negative refractive power, and the system is satisfied with 0<|f/f5|<1 (herein, f represents an effective focal length of the entire lens system, and f5 represents an effective focal length of the fifth lens).