Zoom Lens Five-Group Configuration for Brightness and Aberration Control
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Solution Overview
Problem
Conventional vibration-reduction zoom lenses fail to achieve optimal optical performance and F-number brightness.
Innovation Solution
A zoom lens configuration comprising a first negative refractive power lens group, a second positive refractive power lens group, a third negative refractive power lens group, a fourth positive refractive power lens group, and a fifth positive refractive power lens group, where the distances between these groups change during varying magnification, and the second and fourth lens groups move along the same trajectory along the optical axis, while at least the third lens group moves along the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional vibration-reduction zoom lens configuration is used, then the angle of view is wide, but the F-number brightness and optical performance are insufficient
Solution Approach 1:
The zoom lens is divided into five distinct lens groups (G1, G2, G3, G4, G5) with alternating refractive powers, where each group serves specific optical functions. The second and fourth lens groups are further segmented to move along the same trajectory, enabling coordinated aberration correction while maintaining compact structure and achieving excellent optical performance with F2.8-F4.0 brightness.
2Reliability
If the second and fourth lens groups move along the same trajectory, then aberration correction is improved, but the device complexity increases
Solution Approach 1:
The second lens group (G2) and fourth lens group (G4) are designed to move along the same trajectory during zooming, effectively merging their motion paths. This coordinated movement enables simultaneous correction of spherical aberration and coma aberration across the zoom range, achieving excellent optical performance while the trajectory design maintains reasonable mechanical complexity.
3Adaptability or versatility
If multiple lens groups move during varying magnification, then zoom functionality is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The zoom lens mechanism is designed so that the second and fourth lens groups move along the same trajectory, creating a coordinated motion system where positioning errors can compensate for each other. This equipotential design reduces the cumulative effect of manufacturing tolerances, making it easier to achieve the required zoom functionality with practical manufacturing precision.
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 satisfactory varying magnification and aberration correction, achieving a brightness F-number of approximately F2.8 to F4.0 and excellent optical performance.
Implementation Method 1
a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, a fourth lens group, and a fifth lens group
Data Source
AI summary
A zoom lens includes, in order from an object along an optical axis: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a negative refractive power; a fourth lens group; and a fifth lens group. When the zoom lens performs varying magnification, the distance between the first and second lens groups changes, the distance between the second and third lens groups changes, the distance between the third and fourth lens groups changes, the distance between the fourth and fifth lens groups changes, the second and fourth lens groups move along the same trajectory along the optical axis, and at least the third lens group moves along the optical axis.