Zoom Lens Configuration for Compact Wide-Angle High Zoom Ratio
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Solution Overview
Problem
Existing zoom lenses face challenges in achieving a high zoom ratio and wide angle of view while maintaining compactness, as widening the angle of view tends to increase the effective diameter of the front lens, making it difficult to reduce the overall system size without compromising optical performance.
Innovation Solution
The zoom lens configuration includes a first lens unit with a positive refractive power that does not move for zooming, and the third and fourth lens units move towards the object side, with specific focal length and displacement ratios, and curvature relationships that allow for a high zoom ratio and reduced system size, while maintaining favorable optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the angle of view is widened, then the field of view is improved, but the effective diameter of the front lens increases and the system size enlarges
Solution Approach 1:
The zoom lens is divided into multiple lens units (first through fourth lens units plus rear unit) with different refractive powers. The first lens unit with positive refractive power remains stationary while other units move, allowing the system to achieve wide angle of view without proportionally increasing the front lens diameter.
Solution Approach 2:
Different lens units are assigned specific refractive powers and movement characteristics optimized for their local function. The first lens unit maintains positive refractive power and stays fixed, while subsequent units have negative or positive powers and move during zooming, enabling compact wide-angle design.
2Adaptability or versatility
If a high zoom ratio is achieved, then the versatility is improved, but the system complexity increases
Solution Approach 1:
The zoom lens employs dynamic movement of the second, third, and fourth lens units during zooming operations. These units move along the optical axis to different positions, enabling the system to achieve high zoom ratio (e.g., 7x or higher) while maintaining manageable complexity through controlled motion 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 enables a high zoom ratio, wide angle of view, and size reduction of the entire system while minimizing spherical aberration and coma, ensuring optimal optical performance across the zoom range.
Implementation Method 1
a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a rear unit including at least one lens unit. In the zoom lens, the locus of movement, the focal length, the amount of displacement during zooming, and the shapes of lens surfaces are appropriately set for each lens unit.