Miniaturized Optical Lens Assembly Aberration Control
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Solution Overview
Problem
Conventional miniaturized wide-angle lenses face challenges in controlling image aberration while maintaining low F-number and excellent aberration correction, which is crucial for high-resolution camera systems in electronic devices.
Innovation Solution
The optical lens assembly consists of a sequence of lenses with specific refractive powers, including a first lens with negative power, a second lens with positive power, a third lens with negative power, and a last lens with negative power, arranged from the object side to the image side, satisfying conditions such as f/EPD < 1.8, CT3/OAL < 0.055, and LLS/OAL > 0.2, along with additional lens configurations to reduce chromatic aberration and flare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to reduce size, then the device size is reduced, but aberration control deteriorates
Solution Approach 1:
The lens assembly is divided into multiple lens elements (first lens with negative power, second lens with positive power, third lens with negative power, and last lens with negative power) arranged in sequence. Each lens element contributes to correcting specific aberrations while maintaining a compact overall structure, resolving the contradiction between miniaturization and aberration control.
Solution Approach 2:
The patent applies specific parameter constraints including f/EPD < 1.8, CT3/OAL < 0.055, and LLS/OAL > 0.2 to optimize the optical performance. By carefully controlling the focal length, entrance pupil diameter, and relative positions of lens elements, the design achieves excellent aberration correction in a miniaturized form factor.
2Illumination intensity
If the F-number is reduced to increase aperture, then light gathering ability is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent maintains a low F-number (f/EPD < 1.8) while achieving excellent aberration correction by optimizing the power distribution across lens elements and controlling the thickness and spacing parameters. The specific constraint CT3/OAL < 0.055 ensures the third lens thickness is appropriately controlled to maintain both aperture and aberration performance.
3Manufacturing precision
If more lens elements are added to improve aberration correction, then optical performance is improved, but device complexity increases
Solution Approach 1:
The lens assembly uses a segmented structure with four main lens elements, each with specific refractive power characteristics. This segmentation allows effective aberration correction while maintaining a relatively simple and compact overall structure suitable for mobile devices.
Solution Approach 2:
The patent employs a composite lens structure combining lenses with different refractive powers (negative, positive, and negative again) to achieve superior aberration correction. This composite approach allows each element to compensate for the aberrations introduced by others, improving performance without requiring excessive numbers of elements.
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
This configuration enhances the optical performance of miniaturized lenses by improving aberration characteristics, reducing chromatic aberration, and maintaining a compact size suitable for high-resolution image capture in electronic devices.
Implementation Method 1
a first lens L1 having a negative refractive power
Implementation Method 2
a second lens L2 having a positive refractive power
Implementation Method 3
a third lens L3 having a negative refractive power
Implementation Method 4
a last lens L5 having a negative refractive power
Data Source
AI summary
Provided are an optical lens assembly and an electronic device. The optical lens assembly includes a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, and a last lens having a negative refractive power. The first lens, the second lens, the third lens, and the last lens may be sequentially arranged from an object side to an image side of an optical axis, the object side facing an object for image capture and the image side facing an image plane of an image sensor.