Miniature Optical System Aberration Control
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Solution Overview
Problem
Existing miniature optical systems for compact digital cameras in mobile communication terminals face challenges in achieving a balance between small size and high performance, leading to sensitivity issues and difficulty in collecting chromatic aberration, which affects image quality.
Innovation Solution
A miniature optical system comprising four sequentially aligned lenses with specific focal length and refractive power ratios, including aspheric surfaces and materials like plastic and glass, designed to satisfy specific equations for optimal performance and minimize aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical system is scaled down to reduce size, then the device becomes more compact, but chromatic aberration increases and image quality deteriorates
Solution Approach 1:
The optical system is divided into multiple lens elements (first through fourth lenses) with alternating positive and negative refractive powers. This segmentation allows each lens to contribute differently to the overall optical performance, enabling chromatic aberration correction through the combined effect of multiple elements while maintaining a compact form factor.
Solution Approach 2:
The patent employs lenses made from different materials with specific refractive indices and dispersion characteristics. The first and third lenses use materials with higher refractive indices, while the second and fourth lenses use materials with lower refractive indices. This composite material approach enables effective chromatic aberration correction in the miniature optical system.
2Manufacturing precision
If more lens elements are added to correct chromatic aberration, then image quality improves, but the system becomes more complex and larger
Solution Approach 1:
The patent optimizes specific parameters of each lens element, including focal lengths, refractive powers, and spacing between elements. By carefully controlling these parameters and their ratios, the system achieves effective chromatic aberration correction with only four lens elements, avoiding the need for more complex multi-element designs.
Solution Approach 2:
The patent incorporates aspheric surfaces on one or more lens elements to correct optical aberrations. The aspheric curvature allows for improved aberration correction compared to spherical surfaces, enabling better image quality with a compact number of elements.
3Volume of moving object
If the focal length is reduced to make the system more compact, then the device size decreases, but the ability to collect light and form images deteriorates
Solution Approach 1:
The patent optimizes the F-number of the optical system by carefully selecting the focal length and aperture diameter ratio. The design achieves a balanced F-number that allows sufficient light collection capability while maintaining a compact overall size, resolving the trade-off between compactness and light gathering ability.
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 structure with stable optical performance, reducing chromatic aberration and enhancing image quality, suitable for high-pixel camera functions in small-sized mobile devices.
Implementation Method 1
first to fourth lenses, which are sequentially aligned from an object side to an image side
Data Source
AI summary
Disclosed is a miniature optical system. The miniature optical system includes a first lens; a second lens; a third lens; and a fourth lens, wherein the first to fourth lenses are sequentially aligned from an object side to an image side of the system. The lenses satisfy the following equation: −1.5<f2/ttl<−0.5, where f2 is the focal length of the second lens and ttl is a distance from an object side of the first lens to an image side of the system.