Imaging Optical System Wide-Angle Aberration Correction
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Solution Overview
Problem
Existing imaging optical systems for projection-type display apparatuses face challenges in achieving wide angles with satisfactory aberration correction while maintaining image quality and controlling costs, particularly in systems with intermediate images formed by multiple lenses, which often result in increased complexity and cost due to the need for multiple focusing groups.
Innovation Solution
The proposed imaging optical system consists of a first optical system and a second optical system, where the focus group moves along the optical axis between the most magnified side and the intersection of the principal ray with the optical axis, satisfying specific conditional expressions to achieve wide-angle aberration correction with reduced lens sizes and cost, including the use of a single lens focus group and refractive power configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an intermediate image is formed in a reduced-side optical system and re-formed in a magnified-side optical system, then the back focus and lens diameters are reduced, but the system complexity and cost increase due to multiple focusing groups
Solution Approach 1:
The patent combines the focusing function with the intermediate image formation function by using the same optical groups (specifically the second and third lens groups) to perform both tasks. This eliminates the need for separate focusing groups while maintaining the compact design benefits of intermediate imaging.
Solution Approach 2:
The optical groups in the reduced-side optical system are designed to serve multiple functions: forming the intermediate image and performing focusing adjustments. This multi-functionality reduces the total number of components needed in the system.
2Manufacturing precision
If aberration corrections are independently performed in reduced-side and magnified-side optical systems, then each system can be optimized, but the overall system cannot achieve wide angle performance
Solution Approach 1:
The patent merges the aberration correction functions by having the magnified-side optical system correct aberrations from both its own lenses and the reduced-side optical system. This coordinated approach enables wide-angle performance while maintaining aberration correction quality.
3Adaptability or versatility
If focal length is reduced to widen angle, then wide angle performance is achieved, but image plane curvature increases due to distance fluctuation
Solution Approach 1:
The patent uses the distance fluctuation that causes image plane curvature as a means to adjust the position of the intermediate image. By allowing the intermediate image position to vary with distance changes, the system maintains focus and corrects image plane curvature without requiring additional complex mechanisms.
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 corrects image plane curvature and distortion across a wide angle while minimizing the number of lenses and focusing groups, thereby reducing the system's size and cost while maintaining high image quality.
Implementation Method 1
a first optical system which is constituted by a plurality of lenses; and a second optical system which is constituted by a plurality of lenses, wherein the second optical system forms the image on the image display device as an intermediate image, the first optical system forms the intermediate image on the magnified-side conjugate plane
Data Source
AI summary
In the imaging optical system that consists of a first optical system and a second optical system in order from a magnified side, and has an intermediate image formed between the first optical system and the second optical system, a focus group moving during focusing is included between a most magnified side of the first optical system and a position at which a principal ray of light having a maximum angle of view and an optical axis of the first optical system intersect each other, and a predetermined conditional expression relating to the focus group is satisfied.