Tilted-Lens Optical System Non-Coaxial Aberration Compensation
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Solution Overview
Problem
Tilted-lens image forming optical systems often result in non-axisymmetric light intensity distribution, leading to reduced imaging performance, measurement accuracy, and displaying performance in projectors and profile measuring apparatuses due to asymmetric aberrations.
Innovation Solution
Incorporating a non-coaxial optical member in the image forming optical system, where the first optical member is inclined opposite to the image plane's inclination, and the second optical member is inclined in the same direction as the image plane, to cancel non-axisymmetric aberrations, thereby improving image forming performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a tilted-lens image forming optical system is used to satisfy the Scheimpflug condition, then the imaging geometry is improved for profile measurement, but non-axisymmetric aberrations occur leading to reduced imaging performance and measurement accuracy
Solution Approach 1:
The patent applies asymmetry by intentionally introducing a non-coaxial optical member (prism or lens) that is tilted relative to the optical axis. This asymmetric configuration generates aberrations that counterbalance the non-axisymmetric aberrations produced by the tilted lens system, thereby improving overall imaging performance while maintaining the Scheimpflug condition for accurate profile measurement
Solution Approach 2:
The patent employs preliminary anti-action by pre-introducing optical elements with specific aberration characteristics before the light reaches the image plane. The non-coaxial optical member is positioned and tilted in advance to generate compensating aberrations that neutralize the harmful effects of the tilted lens system, ensuring both measurement accuracy and imaging quality
2Shape
If the image plane is tilted to achieve the Scheimpflug condition, then the object plane and image plane intersection geometry is improved, but asymmetric aberrations are generated reducing light intensity distribution uniformity
Solution Approach 1:
The patent uses asymmetry by incorporating a non-coaxial optical member tilted at a specific angle relative to the optical axis. This asymmetric element creates aberrations that counterbalance the asymmetric light intensity distribution caused by the tilted image plane, restoring uniformity while preserving the geometric benefits of the Scheimpflug condition
Solution Approach 2:
The patent applies parameter changes by adjusting the tilt angle and position of the non-coaxial optical member to optimize the compensation effect. By carefully controlling these parameters, the system achieves balance between maintaining the tilted image plane geometry for measurement accuracy and correcting the asymmetric light intensity distribution for uniform imaging
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 suppresses the occurrence of non-axisymmetric aberrations, enhancing imaging performance, measurement accuracy, and maintaining high precision in profile measurements by ensuring axisymmetric light distribution and correcting aberrations.
Implementation Method 1
an image forming optical system includes a first optical member which is non-coaxial with respect to an optical axis
Data Source
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AI summary
An image forming optical system (21) is an image forming optical system wherein an object plane (P1) and an image plane (P2) are inclined to each other in mutually opposite directions, with respect to a first axis (25) connecting a point in the object plane (P1) and a point in the image plane (P2) conjugate with the point in the object plane, in a flat plane which includes the first axis and which is perpendicular to an intersection line between a plane including the object plane and another plane including the image plane, the image forming optical system including a first optical member (51) which is non-coaxial with respect to the first axis in the flat plane. In a tilted-lens image forming optical system, it is possible to suppress the lowering of imaging performance.