Projection Optical System with Complementary Aspheric Surfaces
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Solution Overview
Problem
Existing projection optical systems require a large number of optical members and complex mechanical drive mechanisms to correct higher-order and rotationally asymmetric distortions, which is challenging to implement in limited spaces.
Innovation Solution
A projection optical system comprising a pair of optical elements with complementary aspheric surfaces that can be independently driven in orthogonal directions to control optical performance, allowing for the correction of higher-order and rotationally asymmetric distortions with a reduced number of optical members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If nearly twice as many optical members are used to correct multiple rotationally asymmetric aberrations, then the correction accuracy of higher-order and rotationally asymmetric distortions is improved, but the device complexity and space requirement increase significantly
Solution Approach 1:
The patent combines multiple correction functions into a single optical member by superimposing multiple rotationally asymmetric surface shapes (different orders and types) on one element. This allows simultaneous correction of various distortion components without requiring separate optical members for each aberration type, thereby reducing device complexity while maintaining correction accuracy
Solution Approach 2:
The optical member is designed with multi-functional capability to correct multiple types of rotationally asymmetric aberrations (including higher-order distortions) simultaneously. By integrating multiple correction functions into one element, the system achieves comprehensive aberration correction without proportionally increasing the number of optical components
2Stability of the object's composition
If nearly twice as many optical members are arranged to correct multiple aberrations, then the optical performance stability is improved, but the arrangement becomes difficult in limited space
Solution Approach 1:
Multiple correction functions are merged into a single optical member, significantly reducing the number of components that need to be arranged in the limited space. This consolidation maintains optical performance stability through precise surface design while freeing up spatial resources in the projection optical system
3Measurement precision
If as many mechanical drive mechanisms are provided as optical members, then the position control accuracy of optical members is improved, but the mechanical complexity and space requirement increase
Solution Approach 1:
The reduction in optical member count directly reduces the number of required mechanical drive mechanisms. By combining multiple correction functions into one element, the system needs fewer actuators and drive mechanisms, thereby reducing mechanical complexity while maintaining position control accuracy through precise control of the single multi-functional element
Data Source
AI summary
A projection optical system of the present invention includes an optical element group that includes optical elements, and a controller that drives at least one of the first optical elements. The optical element group includes aspheric surfaces having a complementary relationship with each other and are arranged so that the aspheric surfaces face each other. The controller changes a relative position between the optical elements in a first direction and a second direction orthogonal to the first direction to control optical performances of the projection optical system corresponding to each of the first direction and the second direction.