Zoom Lens Segment Groups for Compact Vibration Reduction
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Solution Overview
Problem
Conventional zoom lenses face challenges in downsizing due to the separate placement of focusing lens and vibration reduction lens drive mechanisms, which complicates the imaging optical system and affects image forming performance.
Innovation Solution
The optical element configuration includes a first segment group with positive refractive power, a second segment group with positive refractive power, a third segment group with negative refractive power, and a fourth segment group with positive refractive power, where the first segment group moves along the optical axis for focusing and the third segment group moves perpendicular to the optical axis for vibration reduction, allowing both functions to be integrated within the same lens group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If focusing lens and vibration reduction lens are positioned in different lens groups, then each function can be implemented separately, but the imaging optical system becomes larger and more complex
Solution Approach 1:
The patent combines the focusing lens and vibration reduction lens into the same lens group (specifically, the rear group), allowing both functions to be integrated within a unified structure. This merging eliminates the need for separate lens groups, thereby reducing overall system size and complexity while maintaining both focusing and vibration reduction capabilities
Solution Approach 2:
The lens group is designed to perform multiple functions simultaneously - both focusing and vibration reduction. By making the lens group universal, it can adjust its position along the optical axis for focusing while also moving perpendicular to the optical axis for vibration reduction, eliminating the need for dedicated separate mechanisms
2Ease of operation
If focusing lens and vibration reduction lens are positioned in different lens groups, then each mechanism can operate independently, but the overall system size increases
Solution Approach 1:
The patent merges both functions into a single lens group, reducing the volume of the imaging optical system by eliminating redundant structures and overlapping mechanisms while maintaining independent operational capability through coordinated movement control
3Reliability
If separate focusing and vibration reduction mechanisms are used, then each function is optimized, but manufacturing complexity increases
Solution Approach 1:
By combining both functions into one lens group, the patent reduces the number of components that need to be manufactured and assembled, simplifying the manufacturing process while maintaining functional optimization through carefully designed movement 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 downsized imaging optical system with high image forming performance by integrating focusing and vibration reduction capabilities, reducing aberrations and simplifying the lens structure while maintaining effective vibration correction.
Implementation Method 1
a first segment group having positive refractive power; a second segment group having positive refractive power; a third segment group having negative refractive power; and a fourth segment group having positive refractive power
Implementation Method 2
said third segment group being moved in a direction including a component perpendicular to the optical axis
Data Source
AI summary
An optical element Oc comprising, in order from an object side: a first segment group Gr1 having positive refractive power; a second segment group Gr2 having positive refractive power; a third segment group Gr3 having negative refractive power; and a fourth segment group Gr4 having positive refractive power; focusing on a near-distance object point from an infinite-distance object point being conducted by moving said first segment group Gr1 along an optical axis, said third segment group Gr3 being moved in a direction including a component perpendicular to the optical axis, and said optical element having positive refractive power on the whole, thereby providing an optical element including both of the focusing lens and the vibration reduction lens and capable of downsizing an imaging optical system including this optical element and acquiring a high image forming performance.