Eight-Lens Optical Imaging Layout for Reduced Camera Protrusion
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Solution Overview
Problem
The increasing size of image sensors in portable terminals leads to a protrusion of the camera, which is problematic due to the corresponding increase in the total length of the optical system.
Innovation Solution
An optical imaging system comprising a specific configuration of lenses with refractive indices and focal lengths, including a first lens with positive refractive power and a second lens with negative refractive power, and satisfying various conditional expressions to maintain compactness while achieving high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of image sensor increases to achieve higher resolution, then image quality is improved, but the total length of optical system increases causing camera protrusion
Solution Approach 1:
The patent employs lenses with high refractive indices (specifically at least three lenses with refractive index ≥ 1.61) to change the optical parameters of the system. This allows the optical system to achieve the required focal length and imaging performance with a shorter physical length, thereby reducing camera protrusion while maintaining high resolution capability
Solution Approach 2:
The patent optimizes the spatial arrangement and positioning of multiple lenses along the optical axis, utilizing different dimensional positioning strategies. By carefully controlling the object-side and image-side distances of each lens element, the system achieves compact overall length while maintaining the necessary optical path length for high-resolution imaging
2Length of stationary object
If the total length of optical system is reduced to prevent camera protrusion, then compactness is improved, but achieving high resolution becomes difficult
Solution Approach 1:
The patent uses a composite lens system comprising multiple lens elements with different refractive indices (at least three with refractive index ≥ 1.61). This composite structure allows the system to achieve both compactness and high resolution by combining the optical advantages of different lens materials and designs
Solution Approach 2:
The optical system is divided into multiple discrete lens elements (first through eighth lenses) with specific refractive powers and positions. This segmentation allows each lens element to contribute differently to the overall optical function, enabling the system to achieve high resolution imaging within a compact form factor
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 maintains a compact form factor while achieving high resolution and field of view, addressing the issue of camera protrusion and enhancing image quality.
Implementation Method 1
a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power... at least three of the first to eighth lenses may each have a refractive index of 1.61 or more
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens disposed in order from an object side. The first lens has positive refractive power, and the second lens has negative refractive power. At least three of the first to eighth lenses each has a refractive index of 1.61 or more, and (TTL/(2×IMG HT))×(TTL/f)<0.64 is satisfied, where TTL is a distance from an object-side surface of the first lens to an imaging plane on an optical axis, IMG HT is half a diagonal length of the imaging plane, and f is a total focal length of the first lens to the eighth lens.