Resin Five-Lens Assembly for Aberration Control in Compact Cameras
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Solution Overview
Problem
Conventional optical systems with five lenses and an image sensor face challenges in correcting chromatic aberration and controlling aberration due to a low refractive index, leading to increased size and difficulty in miniaturization, especially when high-pixel sensors are required.
Innovation Solution
A lens assembly with five lenses, including a combination of positive, negative, and positive refractive powers, made of synthetic resin, is designed to minimize overall length and correct aberrations, featuring a specific arrangement and refractive index distribution that satisfies certain Abbe number and field of view ratios, along with an aperture stop to control light and minimize system size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lenses are combined to achieve low F-number and low aberration, then image quality is improved, but the size of the optical system increases
Solution Approach 1:
The patent applies parameter changes by using synthetic resin materials with specific refractive indices (nd2=1.66065, nd3=1.61444, nd4=1.63910) and Abbe numbers (Vd2=20.36, Vd3=25.93, Vd4=23.96) to achieve both compact size and high image quality. The specific parameter ranges for focal lengths and spacing between lenses are optimized to minimize optical system length while maintaining low aberration and low F-number
Solution Approach 2:
The patent uses composite material principles by combining multiple synthetic resin lenses with different refractive indices and Abbe numbers. Each lens is made from synthetic resin with specifically controlled optical properties, creating a composite optical system that achieves superior aberration correction and compact size compared to single-material systems
2Measurement precision
If image sensor pixel count is increased to obtain higher-resolution images, then image resolution is improved, but the size of the electronic device increases
Solution Approach 1:
The patent enables support for high-pixel sensors by optimizing optical parameters including focal length (f=4.64mm), F-number (Fno=1.88), and field of view (FoV=79.5°). The precise control of lens spacing (d1=0.12mm, d2=0.23mm, d3=0.23mm, d4=0.21mm) and curvature radii allows the optical system to maintain high image quality with compact dimensions, accommodating high-pixel sensors without increasing device size
3Ease of manufacture
If synthetic resin lenses with low refractive index are used, then manufacturing ease is improved, but aberration correction becomes difficult
Solution Approach 1:
The patent overcomes the limitation of low refractive index materials by using a composite arrangement of multiple synthetic resin lenses with different refractive indices. The combination of lenses with nd2=1.66065, nd3=1.61444, and nd4=1.63910 creates a system where the varying refractive indices work together to correct aberrations, maintaining ease of synthetic resin manufacturing while achieving superior optical performance
Solution Approach 2:
The patent applies local quality by assigning different refractive indices and Abbe numbers to specific lens positions in the optical system. Each lens is strategically designed with specific material properties (e.g., the second lens has higher refractive index 1.66065 and lower Abbe number 20.36, while the third lens has refractive index 1.61444 and Abbe number 25.93) to correct specific types of aberrations at different locations in the optical path
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 compact optical system capable of supporting high-pixel sensors, reducing overall length and weight while effectively correcting aberrations, thus minimizing the size of electronic devices without compromising image quality.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power
Data Source
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AI summary
An electronic device may be provided according to various embodiments of the present disclosure, the electronic device comprising: a lens assembly having a plurality of lenses aligned along an optical axis in the direction from an object side to an image side, the lens assembly comprising a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, and a fifth lens; and an image sensor (IS) comprising an imaging plane (img) on which an image is formed. The electronic device may be implemented as a compact and high-resolution optical device. The lens assembly as described above may vary according to the embodiment, and a lens assembly and an electronic device comprising same, according to the other various embodiments, may also be provided.