Compact Five-Lens Assembly for Low Aberration Imaging
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Solution Overview
Problem
Existing optical devices face challenges in achieving a compact configuration with a bright lens and short optical whole length to facilitate portability, while maintaining high pixel count and low aberration, especially in electronic devices with limited mounting space.
Innovation Solution
A lens assembly comprising at least five lenses, including a first lens with negative refractive power, a second lens with positive refractive power, and a fifth lens with negative refractive power, aligned along an optical axis, using synthetic resin materials, and an image sensor with specific optical parameters to minimize optical whole length relative to image height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple lenses are combined to achieve low F-number and low aberration, then image quality is improved, but device size increases
Solution Approach 1:
The lens assembly is divided into multiple discrete lens elements (at least five lenses) with different refractive powers arranged in sequence. Each lens element contributes to correcting specific aberrations while maintaining a compact overall structure, allowing high image quality without excessive size increase
Solution Approach 2:
Multiple lens elements are nested within a compact optical housing, with each subsequent lens positioned closer to the image sensor than traditional designs. This nested arrangement allows the optical system to achieve low F-number and low aberration while minimizing the overall optical whole length
2Manufacturing precision
If image sensor pixel count is increased to obtain high-resolution images, then image resolution is improved, but mounting space requirements increase
Solution Approach 1:
The patent transitions from considering only lateral sensor dimensions to optimizing the optical path in the depth dimension (optical whole length). By reducing the optical whole length relative to image height through innovative lens arrangement, high-pixel sensors can be mounted in smaller spaces without sacrificing resolution
3Length of moving object
If optical whole length is reduced to facilitate portability, then device portability is improved, but lens brightness and aberration control become more difficult
Solution Approach 1:
The patent employs aspheric lens surfaces with specific curvature parameters and refractive index variations to maintain optical performance in a compact design. By carefully controlling the parameters of each lens element (refractive power, curvature, thickness), the system achieves low aberration and appropriate brightness distribution despite reduced optical whole length
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 enables a compact, high-pixel image sensor configuration with a wide field of view and reduced overall length, minimizing flare and aberrations, suitable for miniaturized electronic devices.
Implementation Method 1
a first lens from the object side, from among the at least five lenses, has a negative refractive power
Implementation Method 2
a second lens from the object side, from among the at least five lenses, has a positive refractive power
Implementation Method 3
a first lens from the image side, from among the at least five lenses, has a negative refractive power
Data Source
AI summary
An electronic device includes: a lens assembly including at least five lenses aligned in an optical axis direction from an object side of the lens assembly to an image side of the lens assembly, a first lens from the object side has a negative refractive power, a second lens from the object side has a positive refractive power, and a first lens from the image side has a negative refractive power; and an image sensor including an imaging surface on which an image is formed.