Six-Lens Optical System Near-Confocal Infrared Management
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Solution Overview
Problem
Conventional optical image capturing systems in portable electronic devices face challenges in admitting sufficient light and meeting advanced photography requirements, such as low light mode, due to their structure and the need for IR cut filters, which occupy space and increase costs, hindering the miniaturization of surveillance cameras.
Innovation Solution
An optical image capturing system utilizing a combination of refractive powers, convex, and concave surfaces of six-piece lenses, along with specific lens parameters and materials, to reduce the difference in focal lengths for visible and infrared light, achieving a near-confocal effect without an IR cut filter, thereby enhancing light admission and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical systems use four or five lenses structure, then the system structure is simple, but the amount of light admitted is insufficient and image quality cannot meet advanced photography requirements
Solution Approach 1:
The patent combines multiple lens functions into a six-lens system where each lens contributes to both visible and infrared light management. The lenses are designed with specific refractive powers and surface curvatures that work together to admit more light while maintaining compact structure, resolving the contradiction between light admission and structural simplicity.
Solution Approach 2:
The patent optimizes specific parameters including the focal lengths of individual lenses (f1, f2, f3, f4, f5, f6), their refractive powers, and surface curvature radii (R1, R2, R3, R4, R5, R6) to maximize light admission. By carefully controlling these parameters within specific ranges, the system admits more light without proportionally increasing complexity.
2Reliability
If IR cut filter is used to prevent infrared light during daytime, then image fidelity is improved, but system space is occupied and manufacturing cost increases
Solution Approach 1:
The patent removes the IR cut filter from the optical system by designing lenses that inherently manage infrared light through their optical properties. The sixth lens specifically is designed with parameters that control infrared light focusing, eliminating the need for separate filtering components and reducing overall system volume.
Solution Approach 2:
The lens elements, particularly the sixth lens, perform multiple functions: they focus visible light, manage infrared light separation, and control chromatic aberration simultaneously. This multi-functionality replaces the need for dedicated IR cut filters while maintaining image fidelity across different lighting conditions.
3Illumination intensity
If IR cut filter is used to allow infrared light at night, then luminance is elevated, but system space and manufacturing cost increase
Solution Approach 1:
The patent eliminates the need for IR cut filters by integrating infrared light management directly into the lens optical design. The sixth lens is specifically engineered with parameters that enable infrared light to pass through and focus appropriately, removing the need for expensive filter components and simplifying manufacturing.
Solution Approach 2:
The patent optimizes lens material refractive indices and surface curvature parameters to enhance infrared light transmission and focusing. By adjusting these optical parameters, the system achieves high luminance in infrared conditions without requiring additional expensive components, thereby reducing manufacturing costs.
4Manufacturing precision
If six-piece lens structure is used with specific refractive powers and surfaces, then light admission and image quality are improved, but lens design complexity increases
Solution Approach 1:
The patent assigns specific optical properties to different lens positions: the first four lenses have positive refractive powers for primary focusing, while the fifth and sixth lenses have negative refractive powers for aberration correction and infrared management. Each lens surface is designed with specific curvature radii optimized for its position in the system, achieving high image quality through localized optimization rather than uniform design.
Solution Approach 2:
The patent carefully controls specific parameters within defined ranges: the ratio of focal lengths (0.3<f1/f2<1.5), the refractive powers of individual lenses, and the curvature radii of surfaces. By constraining these parameters to specific ranges, the patent achieves high manufacturing precision while managing design complexity through parameter optimization rather than arbitrary design choices.
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 allows for improved image formation and increased light admission, enabling high-quality image capture in both visible and infrared spectrums, reducing the system's size and cost while maintaining advanced photography capabilities.
Implementation Method 1
utilize the combination of refractive powers, convex surfaces and concave surfaces of four lens
Data Source
AI summary
The invention discloses a six-piece optical lens for capturing image and a six-piece optical module for capturing image. In order from an object side to an image side, the optical lens along the optical axis comprises a first lens with refractive power; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; a fifth lens with refractive power; a sixth lens with refractive power; and at least one of the image-side surface and object-side surface of each of the six lenses is aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.