Multi-Unit Zoom Lens Movement for Wide-Angle Aberration Control
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Solution Overview
Problem
Existing zoom lenses struggle to achieve high optical performance while maintaining a compact size and wide angle, with issues in miniaturization and aberration correction, particularly in cameras with large image sensors.
Innovation Solution
A zoom lens configuration with four or more lens units, including a first positive lens unit, a second negative lens unit with three continuously arranged negative lens elements, and a third positive lens unit, where distances between lens units change during zooming to satisfy specific inequalities for refractive power and shape factors, effectively correcting aberrations and minimizing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lens elements is increased to achieve high optical performance and wide angle, then optical performance is improved, but the size of the lens system increases
Solution Approach 1:
The lens system is divided into multiple lens units, each with specific refractive powers and functions. The second lens unit is further segmented into three negative lens elements arranged continuously, allowing optimized correction of aberrations while maintaining compact overall size.
Solution Approach 2:
Different lens units are assigned specific local functions: the first lens unit has positive refractive power for overall focusing, the second lens unit with three negative elements specifically corrects lateral chromatic aberration and curvature of field, and the third lens unit provides additional positive power. This localized optimization achieves high optical performance without requiring uniform increases in all lens parameters.
2Adaptability or versatility
If the refractive power of lens units is increased to achieve wider angle, then angle of view is improved, but the front lens diameter increases
Solution Approach 1:
The patent optimizes the refractive power distribution among lens units and specifically controls the shape factor of negative lens elements in the second lens unit. By adjusting these parameters and satisfying specific inequality relationships, the system achieves wider angle of view while controlling the front lens diameter through precise parameter optimization rather than simple increases.
3Reliability
If the distance between lens units is increased to correct aberrations, then optical performance is improved, but the overall lens length increases
Solution Approach 1:
The lens units are designed with dynamic movement capabilities during zooming operations. The distances between lens units are optimized to change dynamically across the zoom range, allowing effective aberration correction at different focal lengths while maintaining a compact overall lens length through coordinated movement rather than fixed large separations.
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 enables a compact zoom lens that achieves high optical performance with a wide angle, satisfactorily correcting spherical aberration, coma aberration, and curvature of field, while maintaining a small form factor and suppressing front lens diameter.
Implementation Method 1
a zoom lens consisting of four or more lens units including, 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, and a third lens unit having a positive refractive power
Data Source
AI summary
A zoom lens consists of four or more lens units including, in order from an object side to an image side, first, second, and third lens units having positive, negative, and positive refractive powers, respectively. During zooming from a wide-angle end to a telephoto end, the first lens unit moves, a distance between the first lens unit and the second lens unit is widened, and a distance between the second lens unit and the third lens unit is narrowed. The first lens unit consists of a single positive lens, the second lens unit includes three single lens elements, each having a negative refractive power, arranged continuously in order from the object side to the image side, predetermined conditions are satisfied.