Variable-Magnification Optical System for Lightweight Aberration Control
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Solution Overview
Problem
Existing optical systems for image pickup apparatuses face challenges in achieving both a reduction in weight and maintaining favorable optical characteristics when incorporating a variable-magnification optical system, particularly due to issues with lens diameter, weight distribution, and aberration variations.
Innovation Solution
The optical system includes a main optical system with specific lens configurations and a variable-magnification optical system inserted between the aperture stop and image plane, maintaining a constant distance from the closest lens to the object side to the image plane, and adhering to specific inequalities to optimize weight reduction and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable-magnification optical system is inserted into the optical path to change focal length, then the versatility and functionality of the image pickup apparatus is improved, but the weight of the entire system increases
Solution Approach 1:
The patent employs a variable-magnification optical system that can be dynamically inserted into or removed from the optical path. This dynamic configuration allows the system to change its focal length capability on demand, rather than maintaining a fixed extended configuration, thereby reducing weight when the extended functionality is not needed while preserving adaptability when required.
Solution Approach 2:
The optical system is divided into a main optical system and a separate variable-magnification optical system. This segmentation allows the variable-magnification component to be independently controlled and positioned, enabling it to be inserted only when focal length change is required, thus avoiding the continuous weight penalty of having it permanently integrated.
2Weight of moving object
If the variable-magnification optical system is positioned closer to the image plane to reduce system weight, then the weight is reduced, but optical characteristics and aberration correction deteriorate
Solution Approach 1:
The patent specifies precise parameter ranges for the variable-magnification optical system's position and optical properties. By controlling the distance from the image plane to be between 0.05×LD and 0.50×LD (where LD is the distance from the object-side lens surface to the image plane), the system achieves optimal balance between weight reduction and maintaining favorable optical characteristics including aberration correction.
3Weight of moving object
If the variable-magnification optical system is made smaller to reduce weight, then the system weight is reduced, but aberration variations increase
Solution Approach 1:
The patent defines specific parameter ranges for the variable-magnification optical system including the distance from the image plane (0.05×LD to 0.50×LD) and the ratio of focal lengths (0.50 < |f/F| < 2.00). These parameter constraints ensure that even when the system is downsized for weight reduction, the aberration variations remain within acceptable limits, maintaining optical reliability.
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 achieves favorable optical characteristics while reducing the overall system weight and minimizing aberration variations, enabling downsizing of the variable-magnification optical system.
Implementation Method 1
The main optical system includes a plurality of positive lenses and a plurality of negative lenses
Data Source
AI summary
An optical system includes a main optical system including an aperture stop, and a variable-magnification optical system configured to be removably inserted between the aperture stop and an image plane. A distance from a lens surface that is the closest to an object side in the main optical system to the image plane is constant before and after insertion and removal of the variable-magnification optical system. The main optical system includes a plurality of positive lenses and a plurality of negative lenses. A distance from the lens surface that is the closest to the object side in the main optical system to a lens surface of a negative lens that is the closest to the object side among the plurality of negative lenses and a total length of the main optical system satisfy a predetermined relationship.