Compact Optical Imaging System with Nested Lens Groups
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Solution Overview
Problem
There is a demand for high-resolution optical imaging systems in portable terminals with reduced size, which existing systems struggle to achieve while maintaining image quality and a wide effective imaging area for high-pixel sensors.
Innovation Solution
The optical imaging system comprises a configuration of multiple lenses with specific refractive powers and arrangements, including a first lens with positive refractive power, a second lens with negative refractive power, and additional lenses with varying refractive powers, along with a reflective member and an infrared cut-off filter, to achieve high resolution and a wide field of view while being compact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses and their arrangements are increased to achieve high resolution and wide field of view, then image quality and effective imaging area are improved, but the overall size of the optical imaging system increases
Solution Approach 1:
The optical imaging system employs a nested arrangement where multiple lens groups (first through fifth lens groups) are positioned within a compact configuration. Each lens group contains multiple lenses with specific refractive powers arranged in sequence, allowing the system to achieve high resolution and wide field of view while maintaining a reduced overall size by nesting functional elements within each other's spatial envelope
Solution Approach 2:
The patent utilizes asymmetric arrangement of lens groups along the optical axis with specific spacing relationships (e.g., distance between first and second lens groups, fourth and fifth lens groups) to optimize the light path folding and angular distribution, effectively expanding the field of view in angular space while constraining the linear dimension of the system
2Adaptability or versatility
If the focal length is increased to achieve various magnifications, then imaging versatility is improved, but the distance from object to imaging plane (TTL) increases
Solution Approach 1:
The optical imaging system is designed with adjustable focal length capability through the coordinated movement of lens groups with different refractive powers. The first lens group with positive refractive power and subsequent groups with varying powers work in combination to dynamically adjust the effective focal length, enabling various magnifications while the compact spacing maintains a short TTL
Solution Approach 2:
The system achieves variable magnification by changing the optical parameters (focal length) through the interaction of multiple lens groups with specific refractive powers. The conditional expressions define optimal parameter ranges that allow focal length adjustment for different magnifications while constraining the TTL to remain short, thus maintaining compactness
3Manufacturing precision
If the refractive indices of lenses are increased to improve optical performance, then image quality is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent assigns specific refractive index ranges to different lens groups based on their functional requirements. The first lens group uses materials with refractive index 1.5-1.7, while the fourth and fifth lens groups use higher index materials (1.7-1.9) to achieve stronger light bending in critical positions. This localized optimization of material properties improves overall optical performance while managing manufacturing complexity by not requiring high-index materials throughout the entire system
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 enables high-resolution image capture with a wide effective imaging area, allowing for various magnifications without image quality degradation, while being compact enough for portable terminals.
Implementation Method 1
the first lens has positive refractive power
Implementation Method 2
the second lens has negative refractive power
Implementation Method 3
an optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side to an imaging side
Data Source
AI summary
An optical imaging system is provided. The optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side to an imaging side. The first lens has positive refractive power, while the second lens has negative refractive power. TTL>10.2 mm, and TTL/(2×IMG HT)≤1.7, where TTL is a distance from an object-side surface of the first lens to an imaging plane on an optical axis, and IMG HT is equal to half a diagonal length of the imaging plane.