Four-Lens Optical Imaging System for Compact Macro Imaging
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Solution Overview
Problem
Current optical imaging systems for portable electronic devices face challenges in achieving miniaturization and high-quality imaging with a small object distance, while also requiring a balance of refractive power and surface shape to reduce size and improve manufacturability.
Innovation Solution
An optical imaging system comprising four lenses with specific refractive powers and configurations, including positive and negative refractive powers, aspheric surfaces, and carefully controlled center thicknesses and spaced intervals, to achieve miniaturization, macro object distance, and high image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical imaging system uses more lenses to improve imaging quality, then the image quality improves, but the system size and complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, focal lengths, and spacing of each lens element. The four-lens configuration with specific positive and negative refractive powers allows achieving high imaging quality while maintaining a compact structure. The parameters are optimized to balance aberration correction with system miniaturization.
2Length of moving object
If the optical imaging system is miniaturized to reduce size, then the system size decreases, but the imaging quality and depth of field may deteriorate
Solution Approach 1:
The optical system is segmented into four distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to contribute specifically to aberration correction and focal length control, enabling compact design without sacrificing imaging quality. The divided structure facilitates better control over light paths in a miniaturized configuration.
Solution Approach 2:
The patent uses composite optical design by combining lenses with different refractive powers and materials properties. The alternating positive and negative power elements create a composite optical system that achieves superior aberration correction and maintains high imaging quality in a reduced size configuration.
3Adaptability or versatility
If the object distance is reduced for macro imaging, then the macro capability improves, but the refractive power balance and aberration control become more difficult
Solution Approach 1:
The patent optimizes parameters for macro imaging by adjusting the focal lengths and spacing of the four lens elements. The system is designed with specific focal length ratios and spacing relationships that maintain aberration control even at reduced object distances. The refractive powers are balanced to handle the increased angular spread of light rays in macro configurations.
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 system effectively reduces the size and sensitivity of the imaging system, enhances manufacturability, and provides deep depth of field and suitable magnification for applications like fingerprint recognition and microscopic imaging.
Implementation Method 1
a first lens having positive refractive power
Implementation Method 2
a second lens having negative refractive power
Implementation Method 3
a third lens having positive refractive power
Implementation Method 4
a fourth lens having negative refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging system including, sequentially from an object side to an image side along an optical axis, a first lens having positive refractive power; a second lens having negative refractive power; a third lens having positive refractive power; and a fourth lens having negative refractive power. A distance TTL along the optical axis from an object-side surface of the first lens to an imaging plane of the optical imaging system and a distance To along the optical axis from a to-be-captured object to the object-side surface of the first lens satisfy 1<TTL/To<2.5.