Dual Focusing Zoom Optical Layout for Angle-of-View Stability
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Solution Overview
Problem
Conventional zoom optical systems experience significant variation in angle of view during focusing operations, which affects image quality and stability.
Innovation Solution
The zoom optical system comprises a front group and a rear group with specific focusing lens groups that move along different trajectories during focusing, adhering to conditional expressions that define appropriate magnification and focal length relationships to minimize angle of view variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zoom optical systems are used, then zooming function is achieved, but variation in angle of view upon focusing occurs
Solution Approach 1:
The patent implements dynamic focusing by allowing the first and second focusing lens groups to move along different trajectories during focusing operations. This dynamic configuration enables independent movement of each lens group, allowing the system to adapt to different focal lengths and minimize angle of view variation while maintaining focusing capability.
Solution Approach 2:
The patent changes the magnification parameters of the focusing lens groups by controlling their movement trajectories. By satisfying specific conditional expressions involving magnification ratios (βF1t/βF1w and βF2t/βF2w), the system adjusts optical parameters to reduce angle of view variation during focusing while preserving zooming functionality.
2Reliability
If focusing lens groups move along different trajectories, then angle of view variation is reduced, but device complexity increases
Solution Approach 1:
The patent divides the focusing function into two separate lens groups (first focusing lens group and second focusing lens group) that can move independently along different trajectories. This segmentation allows each lens group to contribute differently to focusing, enabling angle of view stabilization while distributing the complexity across multiple simpler moving components rather than one complex mechanism.
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 reduces the variation in angle of view upon focusing, enhancing image stability and quality by ensuring consistent optical performance across different focal lengths.
Implementation Method 1
the first focusing lens group and the second focusing lens group move along the optical axis, respectively on trajectories different each other
Data Source
AI summary
A variable magnification optical system (ZL) comprises a front group (GA) and a rear group (GB). The rear group (GB) has a first focusing lens group (GF1) and a second focusing lens group (GF2). From focusing on an object at infinity to focusing on a short-distance object, the front group (GA) is fixed with respect to an image surface, and the first focusing lens group (GF1) and the second focusing lens group (GF2) move on different trajectories along an optical axis. The variable magnification system satisfies the following conditional expressions.0.25<βF1t/βF1w<2.000.25<βF2w/βF2t<2.00where βF1t is the magnification of the first focusing lens group (GF1) in a telephoto end state, βF1w is the magnification of the first focusing lens group (GF1) in a wide-angle end state, βF2t is the magnification of the second focusing lens group (GF2) in the telephoto end state, and ⊕F2w is the magnification of the second focusing lens group (GF2) in the wide-angle end state.