Four-Element Compound Lens Layout for Compact High-Resolution Imaging
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Solution Overview
Problem
Existing camera systems with high sensor resolution face challenges in maintaining a compact lens size due to larger sensor sizes, making it difficult to manufacture lenses smaller than 1.5 mm×1.5 mm while achieving high image quality and a wide field-of-view.
Innovation Solution
A compound lens design comprising four coaxially aligned lenses, with specific refractive powers configured as a negative and positive lenses, allowing for a smaller lens size by converging incident light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high sensor resolution is used, then image quality is improved, but lens lateral size increases
Solution Approach 1:
The optical system is divided into four separate lens elements (first negative lens, second positive lens, third positive lens, fourth positive lens) arranged in sequence. This segmentation allows each lens to perform specific optical functions, enabling high image quality with a compact overall structure that fits small sensors.
Solution Approach 2:
Each lens element is designed with specific local optical properties: the first lens has negative refractive power for light convergence, while the second, third, and fourth lenses have positive refractive power for light divergence and focus control. This local differentiation of optical characteristics enables optimized performance for high-resolution imaging in a small form factor.
2Measurement precision
If traditional four lens design (negative, positive, negative, positive) is used, then image quality is improved, but lens lateral size increases
Solution Approach 1:
The patent inverts the traditional four-lens sequence by placing the negative power lens first instead of alternating negative-positive-negative-positive. The sequence becomes negative-positive-positive-positive, which fundamentally changes the light path management and enables compact lateral dimensions while maintaining high image quality for small sensor applications.
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 design achieves a smaller lens size while maintaining high image quality and wide field-of-view, meeting the requirements for compact camera applications.
Implementation Method 1
the first lens is negative lens. The second lens, the third lens and the fourth lens are positive lenses. Thus, comparing to the design that the first lens and the third lens are negative lens, and the second lens and the fourth lens are positive lens, when the incident lights reach the surface of the third lens with the positive refractive power, the incident lights are converged
Data Source
AI summary
A compound lens includes four coaxially aligned lenses: (i) a first substrate, and a first lens and, in order of increasing distance therefrom, and on a same side thereof, (ii) a second lens, a second substrate, a third lens, a third substrate, and a fourth lens. The first lens is negative lens. The second lens, the third lens and the fourth lens are positive lenses.