Imaging Optical System with Dual Lens Groups and Path Benders
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Solution Overview
Problem
Existing imaging optical systems for projection-type display apparatuses face challenges in achieving a wide angle with high projection performance while maintaining a compact size and effectively correcting various aberrations, as they often result in excessively large lenses and inadequate aberration correction.
Innovation Solution
The proposed imaging optical system consists of a first optical system with a 1a lens group and a second optical system with a 2a lens group, both including optical path bending means, where the second optical system forms an intermediate image, and specific conditional expressions are satisfied to optimize the distance and refractive power ratios, ensuring a wide angle and reduced size with satisfactory aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the angle is widened by reducing focal length in a single optical system, then the angle of view increases, but the lens diameter becomes excessively large
Solution Approach 1:
The optical system is divided into two separate optical systems (first optical system and second optical system) that work in sequence. The first optical system performs initial imaging with a smaller focal length to achieve wide angle, while the second optical system performs re-imaging to correct aberrations and control lens sizes, preventing any single lens from becoming excessively large.
Solution Approach 2:
An intermediate image is formed by the first optical system before the light reaches the second optical system. This intermediate image serves as a mediator that allows the system to achieve wide angle viewing while distributing the optical burden across two systems, preventing excessive lens diameter in either system.
2Length of stationary object
If an intermediate image is formed in a two-system configuration, then the back focus and lens diameters are reduced, but the total lens length increases
Solution Approach 1:
The optical path is made dynamic through the use of reflecting surfaces (mirrors) that can fold the light path. This allows the intermediate image to be formed in a compact configuration where the light reflects back through parts of the first optical system, effectively reducing the total lens length while maintaining the benefits of the two-system intermediate image configuration.
3Manufacturing precision
If aberration corrections are performed independently in first and second optical systems, then each system can be optimized, but the overall aberration correction is insufficient for wide angle applications
Solution Approach 1:
The aberration correction functions of both optical systems are merged and coordinated to work together for the overall wide angle imaging. The first optical system corrects aberrations for the intermediate image, while the second optical system corrects aberrations for the final image, with both corrections being integrated to achieve satisfactory overall aberration correction across the wide angle of view.
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 enables the projection of high-quality images with a wide angle of view while minimizing the size of the imaging optical system, effectively correcting various aberrations and achieving a compact design.
Implementation Method 1
first optical path bending means for bending an optical path on a reflecting surface, and a second optical path bending means for bending an optical path on a reflecting surface
Data Source
AI summary
The imaging optical system consists of a first optical system and a second optical system in order from a magnified side. The first optical system consists of a la lens group, first optical path bender, and a 1b lens group in order from the magnified side, and the second optical system consists of a 2a lens group, second optical path bender, and a 2b lens group in order from the magnified side. The second optical system forms an image on an image display surface as an intermediate image, and the first optical system forms the intermediate image on a magnified-side conjugate plane, to satisfy the following predetermined Conditional Expression (1),3<d/I  (1).