Eight-Lens Optical System for Low-Light Imaging Without IR Filters
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Solution Overview
Problem
Conventional optical image capturing systems in portable electronic devices are inadequate for meeting advanced photography requirements, such as low light mode or night mode, due to insufficient light admission and image quality, especially with the need for IR cut filters that occupy space and increase costs in miniaturized surveillance cameras.
Innovation Solution
An optical image capturing system utilizing a combination of eight lenses with refractive powers and convex/concave surfaces to increase light admission and improve image quality, eliminating the need for IR cut filters by minimizing the focal length difference between visible and infrared light, allowing simultaneous focusing on both spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional optical systems use six or seven lenses structure, then the system structure is relatively simple, but the light admission is insufficient and image quality cannot meet advanced photography requirements
Solution Approach 1:
The patent combines eight lenses with different refractive powers and surface curvatures into a unified optical system. This merging of multiple optical elements with complementary properties increases the overall light admission capability while maintaining a manageable structural complexity through systematic arrangement.
Solution Approach 2:
The patent systematically varies key parameters including the number of lenses (increased to eight), refractive powers (positive and negative combinations), and surface curvatures (convex and concave configurations) to optimize light admission and image quality for advanced photography requirements.
2Reliability
If IR cut filter is added to prevent infrared light and color shift, then image fidelity is improved, but the device occupies more space and increases cost
Solution Approach 1:
The patent extracts and eliminates the need for the IR cut filter by designing an optical system that inherently manages infrared light through the specific configuration of eight lenses. This removal of the separate filter component reduces device volume and cost while maintaining image fidelity through the optical design itself.
Solution Approach 2:
The optical lens system performs multiple functions simultaneously: it focuses visible light for daytime imaging and manages infrared light for nighttime imaging without requiring separate filtering components. The eight-lens configuration provides universal performance across different lighting conditions and wavelengths.
3Illumination intensity
If IR cut filter is added to allow infrared light at night, then luminance is improved, but the device occupies more space and increases cost
Solution Approach 1:
The patent removes the need for removable IR cut filters by incorporating infrared light management directly into the eight-lens optical system design, achieving nighttime luminance improvement without the space and cost of filter mechanisms.
Solution Approach 2:
The optical system is designed to universally handle both visible and infrared light across different conditions. The eight-lens configuration enables the system to capture infrared light for nighttime luminance enhancement while maintaining daytime color accuracy, eliminating the need for filter switching mechanisms.
4Quantity of substance
If pixel size of photosensitive element is minimized, then high pixel field is achieved, but the optical system requires higher precision to maintain image quality
Solution Approach 1:
The patent optimizes multiple optical parameters including lens curvatures, thicknesses, and spacing to achieve precise light focusing for high-density pixel arrays. The systematic adjustment of these parameters ensures that the optical system delivers the required precision for minimized pixel sizes while maintaining manufacturability.
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 achieves enhanced image quality and luminance without IR cut filters, enabling effective low-light imaging and miniaturization of surveillance cameras while maintaining performance across visible and infrared light spectra.
Implementation Method 1
utilize the refractive power of eight lenses, combination of convex and concave surfaces as well as the selection of materials thereof, so as to make the image capturing system reduce the difference between the image focal length of visible light and the image focal length of infrared light
Data Source
AI summary
The invention discloses an eight-piece optical lens for capturing image and an eight-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; a seventh lens with refractive power; and an eighth lens with refractive power; and at least one of the image side and object side of each of the eight lenses can be aspheric. The optical lens can increase aperture value and improve the imagining quality for use in compact cameras.