Intermediate-Imaging Optical System for Wide-Angle Thermal Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wide-angle projection systems with intermediate imaging tend to be heavy and prone to optical aberrations due to thermal deformation, especially when using synthetic resin lenses, which can cause tilting and degrade optical performance.
Innovation Solution
An optical system with an intermediate imaging position conjugated to magnification and reduction conjugate points, comprising a magnification optical system and a relay optical system, with specific air distances and focal length conditions to stabilize mounting and reduce thermal aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a lens made of synthetic resin is used to reduce weight, then the optical system becomes lightweight, but thermal deformation increases causing optical aberrations
Solution Approach 1:
The patent specifies precise parameter ranges for air distances (Ts/fw between 7-15 and Tpr/fw between 2-7) to control thermal deformation effects. By optimizing these dimensional parameters, the system achieves stable optical performance with synthetic resin lenses despite their higher thermal expansion coefficient compared to glass
Solution Approach 2:
The optical system combines multiple lens elements including both synthetic resin and glass lenses in a composite configuration. This allows the system to achieve lightweight construction while using glass in critical positions where thermal stability is most important, balancing weight reduction with optical performance
2Area of stationary object
If the optical system is attached outside the housing to achieve wide-angle projection, then wide screen projection is achieved, but the moment acting on the center of gravity causes tilting
Solution Approach 1:
The patent positions lens groups and adjusts air distances to balance the center of gravity of the optical system. By carefully designing the distribution of optical elements and their spacing, the system reduces the moment acting on the mounting interface, preventing tilting while maintaining wide-angle projection capability
3Illumination intensity
If high-intensity projection is used to improve brightness, then illumination intensity increases, but thermal deformation of synthetic resin lenses worsens optical aberrations
Solution Approach 1:
The patent applies different material properties to different parts of the optical system. Critical lens elements that are more sensitive to thermal deformation are made from glass with superior thermal stability, while less critical elements use lightweight synthetic resin. This local differentiation allows high-intensity projection while minimizing thermal aberrations in sensitive areas
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 reduces the moment acting on the center of gravity, allowing stable mounting and minimizing thermal-induced optical aberrations, thus maintaining optical performance.
Implementation Method 1
an optical system internally having an intermediate imaging position that is conjugated to a magnification conjugate point on a magnification side with respect to the intermediate imaging position and a reduction conjugate point on a reduction side
Data Source
AI summary
The present disclosure is directed to an optical system internally having an intermediate imaging position that is conjugate to magnification and reduction conjugate points, respectively, the optical system including: a magnification optical system having a plurality of lens elements, positioned on the magnification side with respect to the intermediate imaging position; and a relay optical system having a plurality of lens elements, positioned on the reduction side with respect to the intermediate imaging position, wherein there are a plurality of air distances among the lens elements, the magnification optical system includes a magnification optical system front group positioned on the magnification side with respect to the longest air distance in the magnification optical system and a magnification optical system rear group positioned on the reduction side with respect to the longest air distance, and the optical system satisfies the conditions (1) and (2).