Zoom Lens System with Perpendicular Movable Lens Unit
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Solution Overview
Problem
Conventional zoom lens systems fail to achieve satisfactory optical performance, particularly in terms of aberration correction and zoom ratio, due to limitations in lens configuration and movement during zooming.
Innovation Solution
A zoom lens system comprising a front lens group and a rear lens group with specific lens units arranged along the optical axis, where the rear lens group includes a first positive refracting unit, a second negative refracting unit, and a third positive refracting unit, with varying spacings between these units to optimize optical performance, and at least part of the second lens unit is movable perpendicular to the optical axis to compensate for camera shake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens units are arranged with fixed spacings, then the structure is simple, but the optical performance is unsatisfactory
Solution Approach 1:
The patent applies dynamics by making the second lens unit movable in the optical axis direction during zooming operations. This dynamic adjustment allows the spacing between lens units to change from d12w to d12t, enabling the system to optimize optical performance across different focal lengths while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent changes the parameter of spacing between lens units by defining specific relationships: d12t-d12w ≤ 0.170×Bfw and d23w-d23t ≤ 0.185×Bfw. These parameter changes allow the lens system to achieve satisfactory optical performance across the zoom range without requiring complex structural modifications.
2Adaptability or versatility
If the zoom ratio is increased, then the telephoto capability is improved, but the lens barrel size increases
Solution Approach 1:
The patent implements nesting by arranging the lens units in a compact configuration where the second lens unit is positioned between the first and third lens units. The movable second lens unit allows the system to achieve high zoom ratio while maintaining a compact lens barrel structure, as the units are nested within a limited space during zooming operations.
Solution Approach 2:
The dynamic movement of the second lens unit in the optical axis direction enables the system to achieve high zoom ratio without proportionally increasing lens barrel size. The spacing changes from d12w to d12t and from d23w to d23t allow compact arrangement at wide-angle while expanding capability at telephoto end.
3Reliability
If the second lens unit is made movable perpendicular to the optical axis, then camera shake compensation is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the movable second lens unit to serve multiple functions: it participates in zooming operations along the optical axis while also providing camera shake compensation through perpendicular movement. This multi-functionality achieves reliable image stabilization without requiring separate dedicated components, thus limiting the increase in device complexity.
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 system achieves improved optical performance by effectively correcting aberrations and increasing the zoom ratio while maintaining compactness and reducing the lens barrel size, with enhanced compensation for camera shake and manufacturing errors.
Implementation Method 1
a first lens unit having a positive refracting power; a second lens unit having a negative refracting power; and a third lens unit having a positive refracting power
Data Source
AI summary
A zoom lens system has a front lens group and a rear lens group along the optical axis and in order from the object side. The rear lens group has a first lens unit having a positive refracting power, a second lens unit having a negative refracting power, and a third lens unit having a positive refracting power. Upon zooming from a wide-angle end state to a telephoto end state, a space between the front lens group and the first lens unit varies, a space between the first lens unit and the second lens unit increases, and a space between the second lens unit and the third lens unit decreases. At least a part of the second lens unit is movable so as to have a component in a direction perpendicular to the optical axis.