Intermediate Imaging Optics for Thermal Aberration Control
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Solution Overview
Problem
Intermediate imaging-based optical systems face challenges with increased weight and thermal deformation, leading to optical aberrations, especially in high-intensity projection, due to the use of synthetic resin lenses with complex aspherical shapes.
Innovation Solution
An optical system with an intermediate imaging position, comprising a magnification optical system and a relay optical system, where the first lens element is an aspherical lens with specific refractive index and focal length conditions, reducing moments on the center of gravity and mitigating thermal effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a lens made of synthetic resin is used in lieu of a lens made of glass to reduce weight, then the optical system becomes lightweight, but optical aberrations particularly chromatic aberration tend to be increased due to thermal deformation
Solution Approach 1:
The patent changes the material parameter by using synthetic resin with specific thermal and optical properties (lower specific gravity, lower thermal conductivity, higher coefficient of linear expansion) to reduce weight while managing thermal effects through controlled thermal deformation characteristics
Solution Approach 2:
The patent employs composite lens structures combining synthetic resin elements with specific design features to achieve both weight reduction and thermal stability, creating a composite optical system that balances material properties
2Area of stationary object
If the first lens L1a has aspherical double surfaces with complicated shapes to achieve wide-angle projection, then wide-angle projection with short focal length is achieved, but optical aberrations are significantly degraded due to temperature elevation
Solution Approach 1:
The patent applies aspherical surface design to lens elements, particularly the first lens L1a, to correct optical aberrations and achieve wide-angle projection while managing the sensitivity to thermal deformation through controlled aspherical parameters
Solution Approach 2:
The patent implements different surface curvatures and aspherical parameters at different zones of the lens elements, creating local variations in optical properties to correct aberrations while managing thermal effects in high-intensity projection
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
Maintains optical performance even under intense light conditions by reducing the moment on the center of gravity and minimizing thermal deformation, ensuring stable image projection.
Implementation Method 1
a first lens element located closest to the magnification side among the plurality of lens elements in magnification optical system is an aspherical lens having a negative power
Implementation Method 2
an optical system internally having an intermediate imaging position that is conjugate to a magnification conjugate point on a magnification side 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 a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, 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 a first lens element located closest to the magnification side among the plurality of lens elements in magnification optical system is an aspherical lens having a negative power, the optical system satisfies the conditions (1) to (3).