Telecentric Imaging Optical System for Wide-Angle Projection Displays
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Solution Overview
Problem
Existing projection display devices face challenges in achieving a wide angle of view with excellent optical performance while minimizing lens outer diameters and reducing costs, as they often require numerous large-diameter lenses, leading to high costs and potential aberrations.
Innovation Solution
The proposed imaging optical system consists of a first optical system forming an intermediate image and a telecentric second optical system, with specific conditional expressions ensuring a wide angle of view and reduced lens diameters, incorporating aspheric lenses to correct distortions and field curvature, and optimizing the refractive power distribution to maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a projection imaging optical system uses a conventional design with multiple lenses to achieve wide angle of view, then the angle of view increases, but the lens outer diameters become large and costs increase
Solution Approach 1:
The optical system is divided into two distinct optical systems: a first optical system that forms an intermediate image, and a second optical system that re-forms the intermediate image on the reduction side imaging surface. This segmentation allows each subsystem to be optimized independently, enabling wide angle of view while keeping individual lens diameters small.
Solution Approach 2:
An intermediate image is introduced as a mediator between the object and final image planes. The first optical system forms this intermediate image, and the second optical system uses it as its object. This intermediary approach enables the decoupling of the wide-angle function from large lens diameters.
2Reliability
If the optical system uses many lenses with large outer diameters to correct aberrations, then optical performance improves, but manufacturing costs increase
Solution Approach 1:
By segmenting the optical system into two separate systems, each with fewer lenses, the manufacturing complexity and cost are reduced. The first optical system handles the formation of the intermediate image with minimized lens diameters, while the second system handles the final image formation, allowing for cost-effective aberration correction in each subsystem.
Solution Approach 2:
The patent applies specific conditional expressions that define relationships between key parameters (hkc2, hrc1, hkm2, hs) to optimize the optical performance. By controlling these parameters within specific ranges, the system achieves excellent aberration correction while using fewer and smaller lenses, thereby reducing manufacturing costs.
3Adaptability or versatility
If the optical system is designed for wide angle of view in narrow spaces, then adaptability to presentation use improves, but aberration correction becomes more difficult
Solution Approach 1:
The segmentation into two optical systems allows the first system to be optimized for wide angle capture in narrow spaces, while the second system is optimized for image formation with proper aberration correction. The telecentric design of the second system specifically addresses aberration control.
Solution Approach 2:
The patent defines specific parameter relationships through conditional expressions that ensure proper aberration correction is achieved even with the wide angle of view required for narrow space presentation applications.
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 achieves a wide angle of view exceeding 130 degrees with minimized lens diameters, effectively reducing costs and correcting aberrations, resulting in a high-performance imaging optical system for projection display devices.
Implementation Method 1
a first optical system that has at least one lens and forms an intermediate image at a position conjugate to a magnification side imaging surface
Implementation Method 2
a second optical system that has at least one lens and re-forms the intermediate image on a reduction side imaging surface
Implementation Method 3
it is preferable that a lens closest to the reduction side in the first optical system is an aspheric lens
Data Source
AI summary
The imaging optical system consists of, in order from the magnification side, a first optical system forming an intermediate image and a second optical system re-forming the intermediate image, and is configured to be telecentric on the reduction side. The imaging optical system satisfies predetermined conditional expressions relating to a ray height on a lens surface closest to the magnification side in the second optical system, a ray height on a lens surface closest to the reduction side in the first optical system, and heights of rays at a position where a principal ray with the maximum angle of view intersects with the optical axis in the second optical system.