Eight-Lens Optical Layout for Compact High-Resolution Cameras
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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 certain conditional expressions to maintain a compact design while achieving high resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image sensor size is increased to achieve higher resolution, then the image quality is improved, but the total length of the optical system increases causing camera protrusion
Solution Approach 1:
The patent applies parameter changes by selecting specific refractive indices for each lens element (e.g., first lens: 1.54-1.65, second lens: 1.65-1.75, third lens: 1.55-1.65) and controlling focal length ratios (e.g., |f2/f1| between 0.3-1.5, f3/f2 between -0.5 to -0.1). These parameter optimizations enable the optical system to achieve high image quality with a compact total length, preventing camera protrusion while maintaining resolution.
2Measurement precision
If the number of lenses is increased to achieve high resolution, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different refractive index ranges to different lens elements based on their specific positions and functions in the optical system. Each lens is optimized with appropriate refractive index (e.g., second lens with higher refractive index of 1.65-1.75 for better aberration control, fourth lens with 1.50-1.60 for specific focal requirements), enabling high image quality with a moderate number of lens elements and reduced overall complexity.
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 a compact camera design without protrusion from the portable terminal while maintaining high image quality and field of view, addressing the challenge of camera size and resolution.
Implementation Method 1
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
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.