Optical Imaging System Compact Telephoto Module
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Solution Overview
Problem
The increasing number of lenses in camera modules for mobile electronic devices leads to an increase in device thickness, which contradicts the trend of reducing device thickness, especially for telephoto camera modules with long focal lengths that are difficult to integrate in thin devices.
Innovation Solution
An optical imaging system comprising a sequence of lenses, including a first, second, third, fourth, and fifth lens, disposed along an optical axis, where specific ratios and parameters such as maximum effective radii, refractive indices, and focal lengths are optimized to minimize device thickness while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of lenses in the camera module is increased to achieve a long focal length and narrow field of view, then the telephoto imaging capability is improved, but the thickness of the mobile electronic device increases
Solution Approach 1:
The patent employs a nested lens configuration where multiple lenses are arranged in a compact sequence along the optical axis. The fifth lens is positioned close to the fourth lens, and the overall structure is integrated into a thin camera module housing, achieving a compact nested arrangement that reduces the total thickness while maintaining the telephoto optical path length
Solution Approach 2:
The patent transitions from a traditional multi-lens arrangement that extends primarily in the thickness direction to a configuration where lenses are more closely spaced and arranged to optimize the lateral and axial dimensions. By optimizing the effective radii ratios and spacing, the optical system achieves the required focal length with reduced thickness through dimensional optimization
2Adaptability or versatility
If the focal length is increased to achieve a narrow field of view for telephoto imaging, then the zoom effect is improved, but the device thickness increases
Solution Approach 1:
The patent optimizes specific optical parameters including the ratios of maximum effective radii (L3S1el/L1S1el between 0.65-0.85, LfS2el/L1S1el between 0.05-0.35), refractive indices, and spacing distances. These parameter optimizations enable the system to achieve a long focal length with a compact form factor, directly addressing the contradiction between zoom capability and thickness
Solution Approach 2:
The patent combines multiple optical functions into a compact lens assembly where five lenses work together in a tightly integrated configuration. The lenses are arranged with optimized spacing to achieve the telephoto focal length while minimizing the overall thickness, merging the optical path compression function with the imaging function
3Adaptability or versatility
If more lenses are arranged in the thickness direction to achieve telephoto imaging, then the narrow field of view is improved, but the device complexity increases
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific refractive powers (positive, negative, positive, negative, positive). Each lens segment is optimized for specific aberration correction and focal length contribution, allowing the complex telephoto function to be achieved through segmented optimization rather than a single complex element
Solution Approach 2:
The patent assigns different refractive powers and optical properties to different lens elements based on their positions in the optical path. The first, third, and fifth lenses have positive refractive power while the second and fourth have negative refractive power, creating local optical quality variations that collectively achieve the telephoto effect with controlled 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 optimized lens configuration allows for a reduction in device thickness while achieving a long focal length and narrow field of view, effectively addressing the challenge of integrating telephoto camera modules in thin mobile devices.
Implementation Method 1
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed in ascending numerical order along an optical axis of the optical imaging system from an object side of the optical imaging system toward an imaging plane of the optical imaging system, wherein LfS2el/L1S1el≤0.65 and 0.05<T1/TTL<0.1 are satisfied, where LfS2el is a maximum effective radius of an image-side surface of the fifth lens, L1S1el is a maximum effective radius of an object-side surface of the first lens, T1 is a thickness of the first lens along the optical axis, and TTL is a distance along the optical axis from the object-side surface of the first lens to the imaging plane.