Objective Optical System for High Magnification and Compact Size
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Solution Overview
Problem
Current endoscope objective lenses struggle to achieve high magnification and resolving power for microscopic-level observations, limiting their ability to observe physiological tissues at a cellular level in vivo, and existing optical systems for digital cameras and video cameras face challenges in achieving high magnification and small size for macro photography.
Innovation Solution
An objective optical system comprising a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power, where the second lens group moves to adjust object-point distance, satisfying specific conditional expressions to enable both normal and proximity magnifying observations with high resolving power and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the magnification is increased to enable microscopic-level observation, then the resolving power is improved, but the optical system size increases
Solution Approach 1:
The objective optical system is divided into three lens groups (G1, G2, G3) with specific refractive power configurations. The second lens group G2 with negative refractive power is made movable to enable focusing, while the other groups remain fixed. This segmentation allows the system to achieve high magnification and resolving power without requiring a proportionally large overall system size.
Solution Approach 2:
The patent employs specific conditional expressions that define parameter ranges for the lens groups. By controlling the refractive powers and movement parameters within specific ranges, the system achieves high resolving power at close object distances while maintaining a compact overall size. The movable second lens group's position is controlled within defined parameter boundaries.
2Measurement precision
If the number of lens groups is increased to improve resolving power, then the magnification capability is enhanced, but the device complexity increases
Solution Approach 1:
The optical system is segmented into three lens groups with specific functions: G1 (positive refractive power) for initial light convergence, G2 (negative refractive power, movable) for focusing control, and G3 (positive refractive power) for final image formation. This functional segmentation achieves high resolving power while limiting the number of movable components to only G2, thereby controlling device complexity.
Solution Approach 2:
The second lens group G2 is designed to be movable along the optical axis to enable focusing at different object distances. This dynamic element provides the necessary flexibility for proximity magnifying observation without requiring all lens groups to be movable, thus enhancing resolving power capability while maintaining relatively simple device structure.
3Adaptability or versatility
If the second lens group is made movable for focusing, then the adaptability to different object distances is improved, but the device complexity increases
Solution Approach 1:
The optical system segments the focusing function to only the second lens group G2, which has negative refractive power. By making only this single lens group movable while keeping G1 and G3 fixed, the system achieves adaptability to different object distances (from close proximity to farther distances) while minimizing the complexity increase that would result from making all lens groups movable.
Solution Approach 2:
The second lens group G2 is designed as a dynamic component that moves along the optical axis to adjust focus. This single movable group provides the necessary adaptability for both normal observation at long distances and proximity magnifying observation at close distances, while maintaining relatively simple device structure compared to systems with multiple movable lens groups.
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 allows for high magnification and resolving power suitable for microscopic observations, enabling in vivo tissue examination and compact, high-magnification macro photography without the need for additional lenses, while maintaining a small optical system size.
Implementation Method 1
a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power
Data Source
AI summary
An objective optical system includes in order from an object side a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, wherein focusing is carried out by moving the second lens group with respect to a change in an object-point distance, and the following conditional expressions (2) and (3) are satisfied:3<|β| (2), and60°<ω (3),where,β denotes a lateral magnification of the overall objective optical system at the time of focusing to an object point at a close distance, andω denotes the maximum half angle of view at the time of focusing to an object point at a long distance.