Adjustable Lens Assembly for Compact Electronic Devices
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Solution Overview
Problem
In miniaturized electronic devices, the limited number of lenses in a lens assembly makes it difficult to achieve high-quality images and videos due to constraints on overall length and the inability to maintain low F-numbers and small aberrations.
Innovation Solution
The electronic device incorporates a lens assembly with a first lens group having positive refractive power and a second lens group having negative refractive power, allowing the distance between these groups and the image sensor to be adjusted based on the subject's distance, thereby enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses in the lens assembly is increased to achieve high-quality images and videos with low F-number and small aberration, then the image quality is improved, but the overall length of the lens assembly increases, making it difficult to mount in miniaturized electronic devices
Solution Approach 1:
The lens assembly is divided into multiple lens groups (first lens group with positive refractive power and second lens group with negative refractive power) that can move independently relative to each other. This segmentation allows each group to contribute differently to image quality while maintaining a compact overall structure through selective positioning.
Solution Approach 2:
The distances between lens groups and the image sensor are made dynamically adjustable based on the subject distance. This dynamic configuration enables the lens assembly to achieve optimal image quality for different shooting scenarios without requiring a fixed large number of lenses, thereby reducing the overall length while maintaining high imaging performance.
2Length of stationary object
If the number of lenses is limited to reduce the overall length of the lens assembly for miniaturized devices, then the device size is reduced, but it becomes difficult to achieve low F-number and small aberration
Solution Approach 1:
Different lens groups are assigned specific refractive powers (positive and negative) to address different optical requirements locally. The first lens group with positive refractive power and the second lens group with negative refractive power work together to control aberrations in their respective zones, achieving effective aberration correction with a limited total number of lenses.
Solution Approach 2:
The adjustable distances between lens groups allow the optical system to dynamically optimize aberration control for different subject distances. This dynamic adjustment compensates for the limitation of having fewer lenses by optimizing their positioning to minimize aberrations in various shooting conditions.
3Device complexity
If the distances between lens groups are fixed to simplify the structure, then the device complexity is reduced, but the ability to maintain high image quality across different subject distances is compromised
Solution Approach 1:
The lens assembly incorporates adjustable distances between lens groups and between the lens assembly and image sensor, enabling dynamic focus adjustment for different subject distances. This dynamic capability maintains high image quality consistency across various shooting scenarios while adding only moderate structural complexity through controlled degrees of freedom.
Solution Approach 2:
The system changes key optical parameters (distances between lens groups and to image sensor) based on subject distance to maintain optimal image quality. This parameter adjustment approach allows the relatively simple lens assembly structure to adapt to different shooting conditions and maintain consistent high-quality imaging performance.
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 enables the lens assembly to be compactly mounted in miniaturized devices while maintaining high image quality by adjusting the lens distances dynamically, thus overcoming the limitations of a limited number of lenses.
Implementation Method 1
a first lens group having positive refractive power and a second lens group having negative refractive power and an image sensor configured to output an image signal based on light transmitted through the first lens group and the second lens group
Data Source
AI summary
According to an embodiment of the disclosure, an electronic device may include a lens assembly including a first lens group having positive refractive power and a second lens group having negative refractive power and an image sensor configured to output an image signal based on light transmitted through the first lens group and the second lens group. A second distance between the first lens group and the second lens group and a third distance between the lens assembly and the image sensor may be configured to be changed based on a first distance between a subject and the electronic device.