Rigid Scope Lens Frame Segmentation for Tilt Correction
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Solution Overview
Problem
Rigid scopes face challenges in image quality adjustment due to image plane tilt, which is difficult to correct without inducing decentration comatic aberration, a major issue in existing optical systems.
Innovation Solution
The rigid scope design includes a first lens frame fixing the first and second lens groups with a negative and positive power, respectively, and a second lens frame for the remaining lenses, allowing relative movement perpendicular to the optical axis to correct image plane tilt while minimizing decentration comatic aberration through precise positioning and fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image quality adjustment is performed by moving a negative power lens perpendicular to the optical axis to reduce image plane tilt, then image plane tilt is reduced, but decentration comatic aberration is induced
Solution Approach 1:
The objective lens is divided into multiple lens groups (first through fourth lens groups) with different functions. The first lens group handles negative power and field curvature, the second handles positive power and astigmatism, the third handles positive power and spherical aberration, and the fourth handles negative power and coma. This segmentation allows each group to be optimized for specific aberrations without inducing others.
Solution Approach 2:
Each lens group is designed with specific local optical properties tailored to correct particular aberrations. The first lens group has negative power specifically for field curvature, the second has positive power for astigmatism, and so on. This local optimization ensures that image plane tilt correction does not induce decentration comatic aberration.
2Manufacturing precision
If the objective lens is divided into multiple lens groups with specific powers, then image quality is improved by reducing various aberrations, but the overall diameter of the scope increases
Solution Approach 1:
Multiple lens groups are arranged in a compact configuration where they work together to correct various aberrations simultaneously. The relay lens is integrated with the objective lens groups to form a unified optical system. This merging approach achieves comprehensive aberration correction without proportionally increasing the scope diameter.
Solution Approach 2:
The lens groups are arranged in a nested or compact sequence along the optical axis, with each group positioned to optimize space utilization. The relay lens and objective lens groups are integrated in a space-efficient manner, allowing multiple optical elements to be packed into a compact overall structure.
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 effectively corrects image plane tilt while suppressing decentration comatic aberration, enabling improved image quality and reducing the overall diameter of the scope by allowing for precise adjustment within a radial gap between the lens frames.
Implementation Method 1
an objective lens including, in order from an object side to an image side, a first lens group having a negative power, a second lens group including a lens having a positive power
Data Source
AI summary
A rigid scope includes: an objective lens composed of, in order from an object side to an image side, a first lens group having a negative power, a second lens group including a lens having a positive power, and a third lens group including two or more lenses; a relay lens arranged on the image side of the objective lens; a first lens frame that fixes in place a front group including at least the first lens group and the second lens group of the objective lens; and a second lens frame that fixes in place a rear group including one or more remaining lenses constituting the objective lens and at least part of the relay lens.