Anamorphic Projection Lens Aspect Ratio Conversion
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Solution Overview
Problem
Existing optical projection systems face challenges in maintaining balanced light usage efficiency and telecentricity when converting aspect ratios, as external converters increase projector size and complexity, and rear arrangement-type relay systems fail to achieve telecentricity in both lateral and longitudinal sections.
Innovation Solution
An optical projection system with a diaphragm and a light modulation device lens group having different powers in the longitudinal and lateral directions, featuring an adjustment optical device group that advances and retracts on the optical path, allowing for aspect ratio conversion while maintaining telecentricity by adjusting focal positions and controlling light flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external front arrangement-type converter is used for aspect ratio conversion, then aspect ratio conversion is achieved, but the projector size increases and the optical system becomes more complex
Solution Approach 1:
The patent integrates the aspect ratio conversion function directly into the projection lens by incorporating an anamorphic converter within the lens structure itself, rather than using a separate external converter. This merging of functions eliminates the need for additional external optical components and reduces overall system complexity while maintaining aspect ratio conversion capability.
Solution Approach 2:
The projection lens is designed to perform multiple functions simultaneously: it acts as both the projection lens and the aspect ratio converter through the integrated anamorphic converter. This multi-functional design allows the same optical component to handle both image projection and aspect ratio conversion, reducing the number of separate components needed.
2Adaptability or versatility
If an external front arrangement-type converter is used for aspect ratio conversion, then aspect ratio conversion is achieved, but the adjustment of the optical system becomes more complex
Solution Approach 1:
By integrating the anamorphic converter within the projection lens structure, the patent reduces the number of separate components that need to be aligned and adjusted. The converter and projection lens move together as a single unit, simplifying the adjustment process compared to separate external converters that require independent alignment.
3Adaptability or versatility
If a rear arrangement-type relay system is used for aspect ratio conversion, then aspect ratio conversion is achieved, but telecentricity is degraded in one direction
Solution Approach 1:
The patent employs an anamorphic converter with asymmetric optical power distribution - it has different focal lengths in the vertical and horizontal directions. This asymmetric design allows the converter to achieve aspect ratio conversion while maintaining telecentricity in both directions by compensating for the different magnification requirements in each axis independently.
Solution Approach 2:
The anamorphic converter is designed with different optical properties in different directions - it has different focal lengths and optical powers for vertical and horizontal light rays. This local differentiation of optical quality allows the system to maintain telecentricity in both directions while achieving aspect ratio conversion, as each direction can be optimized independently.
4Manufacturing precision
If lenses are replaced to maintain image forming performance without a rear arrangement-type relay system, then image quality is maintained, but the relay system becomes longer
Solution Approach 1:
The patent combines the aspect ratio conversion function with the projection lens into a single integrated unit. By incorporating the anamorphic converter within the projection lens structure, the system eliminates the need for a separate relay system, thereby maintaining compact dimensions while preserving image forming performance through the unified optical design.
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
The system ensures high telecentricity in both operating states, reducing directional bias and improving image quality by balancing light usage and maintaining image formation performance, even when aspect ratio conversion is performed.
Implementation Method 1
a light modulation device side lens group which is arranged between the light modulation device and the diaphragm, configured to have different powers in a longitudinal direction and the lateral direction of the light modulation device
Data Source
AI summary
A light modulation device side lens group has different powers in the longitudinal direction and the lateral direction of a liquid crystal panel. Therefore, as the entire system of the optical projection system, the light modulation device side lens group has different magnification in the longitudinal and lateral directions. Therefore, it is possible to make the aspect ratio of an image of the liquid crystal panel different from the aspect ratio of an image projected on a screen. That is, conversion can be performed on an aspect ratio. At this time, a distance p between each focus or a diaphragm and the screen SC side end surface of the light modulation device side lens group satisfies the conditional expressions, so it is possible to achieve a predetermined or higher telecentricity in both states, that is, a first operating state and a second operating state.