Camera Lens Group with Aspheric Surfaces for Portrait Blurring
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Solution Overview
Problem
Current portable electronic devices, such as smartphones, face limitations in achieving high-quality portrait shooting due to inadequate background blurring and edge distinction, primarily relying on algorithms rather than hardware advancements, which results in a gap compared to single lens reflex cameras.
Innovation Solution
A camera lens group with a specific configuration of lenses, including a first lens group with positive refractive power and a second lens group with negative refractive power, optimized optical parameters, and aspheric mirror surfaces, to achieve a high focal length, small size, and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-lens camera system is used for portrait shooting, then background blurring and edge distinction can be improved, but the device size and complexity increase
Solution Approach 1:
The camera lens group is divided into two distinct lens groups: a first lens group with positive refractive power and a second lens group with negative refractive power. This segmentation allows each group to perform specific optical functions, achieving portrait shooting effects with controlled complexity
Solution Approach 2:
The patent employs aspheric mirror surfaces in the lens design, utilizing curved surfaces to correct optical aberrations and improve imaging quality. The aspheric surfaces enable better control over light paths, enhancing background blurring and edge distinction without requiring excessive lens elements
2Manufacturing precision
If the focal length is increased to achieve better portrait effect, then background blurring improves, but the lens size and device thickness increase
Solution Approach 1:
The patent optimizes specific optical parameters including the focal lengths of individual lenses, spacing distances between lens elements, and curvature radii of mirror surfaces. By carefully adjusting these parameters, the system achieves a high focal length (f≥7.0mm) with controlled overall length, suitable for portable devices
Solution Approach 2:
Dividing the optical system into multiple lens groups with different refractive powers allows the achievement of equivalent focal length effects in a more compact configuration, reducing the overall lens group length while maintaining portrait shooting quality
3Device complexity
If algorithm-based background blurring is used, then device simplicity is maintained, but edge distinction and blurring quality are insufficient
Solution Approach 1:
The patent replaces software-based algorithmic background blurring with a hardware-based optical solution. The optical system physically creates background blurring and edge distinction effects through its lens and mirror configuration, eliminating reliance on post-processing algorithms while maintaining device simplicity
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 camera lens group enables enhanced imaging quality with improved background blurring and edge distinction, achieving a high focal length and small size, suitable for portable electronic devices, thereby bridging the gap with single lens reflex cameras.
Implementation Method 1
a first lens group with a positive refractive power, sequentially including, along the optical axis, a first lens, a second lens and a third lens with refractive power respectively; and a second lens group with a negative refractive power
Data Source
AI summary
The disclosure provides a camera lens group, which sequentially includes, from an object side to an image side along an optical axis: a first lens group with a positive refractive power, sequentially including, along the optical axis, a first lens, a second lens and a third lens with refractive power respectively; and a second lens group with a negative refractive power, sequentially including, the optical axis, a fourth lens, a fifth lens, a sixth lens and a seventh lens with refractive power respectively, wherein a total effective focal length f of the camera lens group and an entrance pupil diameter (EPD) of the camera lens group meet f/EPD<1.4; and an effective focal length f1 of the first lens and a spacing distance T34 of the third lens and the fourth lens on the optical axis meet 3.0<f1/T34<5.0.