Zoom Lens Resolution Consistency via Segmented Movable Units
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Solution Overview
Problem
Conventional projection lenses face difficulties in maintaining high-resolution performance across the entire zooming region from wide-angle to telephoto ends, resulting in significant differences in resolution performance.
Innovation Solution
A zoom lens configuration with variable distances between adjacent lens units, including a fixed first lens unit with negative refractive power and movable lens units with specific refractive powers, along with an aperture stop that moves to maintain optical performance, adhering to conditional expressions to ensure high-resolution performance across the zooming region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If five lens units are moved for magnification variation, then the zooming function is achieved, but the high-resolution performance cannot be maintained in the overall zooming region
Solution Approach 1:
The zoom lens is divided into eight lens units with specific refractive powers, where only five units (B2-B6) move for magnification variation while units B1 and B7-B8 remain fixed. This segmentation allows the moving units to handle zooming functions while fixed units maintain optical performance stability across the zooming region.
Solution Approach 2:
Different lens units are assigned specific refractive powers and movement characteristics tailored to their local functions. The first lens unit has negative refractive power and remains fixed, while the eighth lens unit has positive refractive power and also remains fixed, creating local optical quality variations that collectively maintain high resolution across the entire zooming region.
2Manufacturing precision
If the resolution performance is optimized at one end of the zooming region, then high resolution is achieved at that end, but the resolution performance becomes significantly different at the other end
Solution Approach 1:
Five lens units (B2-B6) are designed to move dynamically during magnification variation, allowing the optical system to adapt its configuration across different zoom positions. This dynamic adjustment ensures that resolution performance remains consistent from wide-angle to telephoto ends, rather than being optimized for only one end.
Solution Approach 2:
The refractive powers of the eight lens units are specifically designed according to given formulas, and the movement distances of the five movable lens units are controlled according to specific conditional expressions. These parameter changes ensure consistent resolution performance across the entire zooming region.
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 achieves high-resolution performance and minimal changes in resolution across the entire zooming region, maintaining good optical performance from wide-angle to telephoto ends, with the lens configuration and aperture stop movement effectively controlling distortion and brightness changes.
Implementation Method 1
a first lens unit B1 having a negative refractive power, a second lens unit B2 having a positive refractive power, a third lens unit B3 having a positive refractive power, a fourth lens unit B4 having a negative refractive power, a fifth lens unit B5 having a positive refractive power, a sixth lens unit B6 having a positive or negative refractive power, a seventh lens unit B7 having a positive refractive power, and an eighth lens unit B8 having a positive refractive power
Data Source
AI summary
A zoom lens comprising a plurality of lens units, in which a distance between adjacent lens units is variable in a magnification variation. The plurality of lens units include, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit that has a negative refractive power and that is fixed for the magnification variation, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit, a sixth lens unit, and a seventh lens unit, each of which moves for the magnification variation, and an eighth lens unit that has a positive refractive power and that is fixed for the magnification variation.