Compact Zoom Lens Assembly with Aspheric Elements
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Solution Overview
Problem
Conventional compact imaging lenses with single focus design fail to simultaneously provide magnification for distant shots and enlarged view angles for close-range shots, necessitating multiple lenses and compromising image quality.
Innovation Solution
A zoom lens assembly comprising a negative first lens group, a positive second lens group, and a positive third lens group, with at least three aspheric lenses, which reduces total track length and improves image quality by distributing refractive power effectively, allowing for excellent zoom functionality and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single focus design is adopted, then the manufacturing process is simpler and more cost effective, but the lens cannot simultaneously provide magnification for distant shots and enlarged view angles for close-range shots
Solution Approach 1:
The lens assembly is divided into multiple lens groups (first lens group with negative refractive power, second lens group with positive refractive power, and third lens group with positive refractive power) that can move relative to each other along the optical axis, enabling zoom functionality while maintaining a compact structure
Solution Approach 2:
The lens assembly provides multiple functions including wide-angle shooting, telephoto shooting, and zoom functionality within a single lens structure, eliminating the need for multiple separate lenses while maintaining compact size
2Adaptability or versatility
If multiple lenses are used to achieve zoom functionality, then both distant and close-range photo shooting needs are satisfied, but the total track length increases and compact size is compromised
Solution Approach 1:
The lens groups are arranged in a nested configuration where the first, second, and third lens groups are positioned sequentially along the optical axis with optimized spacing, allowing the entire assembly to maintain a compact total track length while providing zoom functionality
Solution Approach 2:
The lens assembly utilizes aspheric surfaces on multiple lens elements (at least three aspheric lenses) to correct aberrations and reduce the total track length, allowing for a more compact design while maintaining image quality across the zoom range
3Adaptability or versatility
If the view angle is increased for wide angle shooting, then close-range shots are improved, but aberrations increase and image quality deteriorates
Solution Approach 1:
Different lens groups are assigned specific functions: the first lens group with negative refractive power is optimized for wide-angle performance and view angle expansion, while the second and third lens groups with positive refractive power are optimized for aberration correction and focal length control, allowing each component to excel at its specific task
Solution Approach 2:
Aspheric surfaces are implemented on at least three lens elements to correct spherical aberration, coma, and other off-axis aberrations that increase with wider view angles, enabling the lens to maintain high image quality across the entire field of view while providing enlarged view angles for close-range shots
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 solution enhances view angles, corrects aberrations, and maintains a compact size while providing superior zoom functionality and image quality, addressing the limitations of single focus lenses.
Implementation Method 1
there are at least three aspheric lenses among the lenses with refractive power of the zoom lens assembly
Implementation Method 2
refractive power is distributed among the first and the second lenses, preventing any single lens having too much refractive power
Data Source
AI summary
This invention provides a zoom lens assembly in order from an object side toward an image side including a first lens group with negative refractive power, a second lens group with positive refractive power and a third lens group with positive refractive power. The first lens group has only two lenses with refractive power from an object side toward an image side in order including a first lens with negative refractive power and a second lens with negative refractive power. The second lens group from an object side toward an image side in order includes an aperture stop, a third lens and a fourth lens. The third lens group includes a fifth lens. The number of the lens with refractive power in the zoom lens assembly is N, which satisfies the condition of 5≦N≦7, and the lens with refractive power in the zoom lens assembly includes at least three aspheric-surface lens.