Imaging Lens System Zooming via Movable Lens Groups
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Solution Overview
Problem
Conventional compact imaging lenses for mobile phone cameras face challenges in achieving high image quality, extended depth of field, and compact size due to mechanical auto focusing mechanisms, which are prone to alignment errors, slow focusing speeds, and large sizes.
Innovation Solution
The proposed imaging lens system includes a configuration of lens groups with specific refractive powers and aspheric surfaces, utilizing an EDOF coding element and aperture stop placement to enable zooming between wide-angle and telephoto modes, reducing total track length and sensitivity, and extending the depth of field through wavefront coding technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical auto focusing mechanism is used, then focusing function is achieved, but alignment error, low focusing speed and large size occur
Solution Approach 1:
The patent replaces the mechanical auto-focusing mechanism with an optical solution using a movable lens group. The lens system includes a first lens group with negative refractive power and a second lens group with positive refractive power that can move along the optical axis to achieve focusing, eliminating the need for complex mechanical AF components while improving focusing speed and reducing alignment errors.
Solution Approach 2:
The patent employs a dynamic lens configuration where the first and second lens groups can move along the optical axis to adjust focus. This dynamic arrangement allows the system to switch between wide-angle and telephoto modes while maintaining compact size, avoiding the need for large mechanical focusing mechanisms.
2Manufacturing precision
If conventional lens configuration is used, then basic imaging is achieved, but image quality and depth of field are limited
Solution Approach 1:
The patent divides the lens system into multiple lens groups with specific refractive powers: a first lens group with negative refractive power, a second lens group with positive refractive power, and a third lens group. This segmentation allows each group to be optimized for specific functions, improving overall image quality while managing system complexity through modular design.
Solution Approach 2:
The patent utilizes aspheric surfaces for the lens elements, particularly for the first and second lens groups. The aspheric curvature helps correct optical aberrations and improve image quality by providing better control over light paths, while the specific curvature parameters are optimized to balance performance with manufacturability.
3Adaptability or versatility
If zooming function is added, then versatility is improved, but system size and complexity increase
Solution Approach 1:
The patent designs a multi-functional lens system where the same lens groups can achieve multiple functions: wide-angle imaging, telephoto imaging, and focusing. By moving the first and second lens groups along the optical axis, the system switches between different focal lengths and focusing states, providing versatility without requiring separate mechanisms for each function.
Solution Approach 2:
The patent combines the focusing function and zooming function into a single optical system by integrating the movable lens groups. The first lens group with negative refractive power and the second lens group with positive refractive power work together to provide both focus adjustment and focal length variation, eliminating the need for separate mechanical AF and zoom mechanisms.
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 improves image quality, reduces the system's sensitivity to manufacturing errors and environmental changes, and simplifies the zoom mechanism, resulting in a compact and high-performance imaging lens system.
Implementation Method 1
a first lens group with negative refractive power comprising a single first lens element with negative refractive power having a convex object-side surface and a concave image-side surface
Implementation Method 2
all lens elements in the second lens group are made of plastic material and the object-side and image-side surfaces thereof are aspheric
Data Source
AI summary
This invention provides an imaging lens system including, in order from an object side to an image side: a first lens group with negative refractive power comprising a single first lens element with negative refractive power; a second lens group with positive refractive power comprising, in order from the object side to the image side: a second lens element with positive refractive power; a third lens element with negative refractive power; an aperture stop; and a fourth lens element with negative refractive power; and a third lens group with positive refractive power comprising a single fifth lens element with positive refractive power; wherein by moving the first lens group and the second lens group along the optical axis while keeping the third lens group stationary, the zooming operation is performed such that the system switches between a wide-angle mode and a telephoto mode.