Rotatable Anamorphic Prism Optical Unit for Aspect Ratio Conversion
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Solution Overview
Problem
Projectors face challenges in accurately converting aspect ratios of input signals with different standards, leading to issues like reduced resolution and light use efficiency due to luminance in image blank regions, and existing solutions struggle to continuously adjust aspect ratios while minimizing color aberration.
Innovation Solution
The projector incorporates an anamorphic prism optical system with rotatable prisms and adjustable spaces between prism sets, allowing for continuous aspect ratio adjustment and color aberration reduction by controlling the rotation amounts and positions of prisms with different refractive indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a front converter anamorphic lens is used for aspect ratio conversion, then the conversion can be performed according to a fixed magnification, but it is difficult to accurately apply various standards having different aspect ratios
Solution Approach 1:
The patent employs rotatable prism sets that can dynamically adjust their orientation to change the aspect ratio conversion magnification. By rotating the prisms around rotation axes, the system can continuously vary the effective focal length and magnification characteristics, enabling accurate conversion for multiple different aspect ratio standards rather than being fixed to one configuration.
Solution Approach 2:
The patent changes the optical parameters of the prism system by adjusting rotation angles and inter-prism distances. These parameter modifications allow the system to achieve different magnification ratios corresponding to various aspect ratio standards (e.g., Cinema Scope, European Vista, American Vista, Standard), thereby improving adaptability while maintaining conversion accuracy.
2Object-affected harmful factors
If two kinds of glass materials are bonded to each other in prism sets to reduce color aberration, then color aberration is reduced when rotation amounts are in a specific relation, but the conditions for color aberration reduction are not satisfied when the relation is changed according to prism rotation
Solution Approach 1:
The patent divides each prism set into multiple individual prisms (first prism, second prism, third prism, fourth prism) with different glass materials and functions. The first and fourth prisms are optimized for changing light beam width, while the second and third prisms are optimized for reducing color aberration. This segmentation allows independent optimization of each component's function while working together as a system.
Solution Approach 2:
The patent combines different glass materials with different refractive indices in a composite prism structure. By selecting specific glass materials for different prisms and arranging them in a composite configuration, the system achieves both aspect ratio conversion and color aberration reduction simultaneously, maintaining performance across various rotation angles.
3Device complexity
If the space between prism sets is fixed, then the structure is simple, but it cannot adjust to different aspect ratios and color aberration conditions
Solution Approach 1:
The patent introduces adjustable spacing between the first and second prism sets, allowing the distance to be varied according to the required aspect ratio conversion and color aberration reduction conditions. This dynamic adjustment capability enables the system to optimize optical performance for different applications while maintaining a relatively simple overall structure.
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 solution enables accurate and efficient aspect ratio conversion across various standards, minimizing color aberrations and maintaining optical performance, while reducing processing and material costs through simplified prism design and integration with the projection optical system.
Implementation Method 1
Each of the first and second prism sets is configured by combining a prism having a main function of changing light beam width... The anamorphic prism optical system gradually rotates the prism for changing light beam width to continuously change an aspect ratio
Implementation Method 2
a prism having a main function of reducing color aberration... The anamorphic prism optical system adjusts the tilt of the prism for color aberration reduction... It is possible to perform adjustment for satisfying conditions for reducing color aberration
Data Source
AI summary
A projector includes an anamorphic prism optical system for converting an aspect ratio of an irradiation region on which the video light is irradiated. The anamorphic prism optical system includes a first prism set and a second prism set. The first prism set is obtained by combining a first prism and a second prism, and the second prism set is obtained by combining a third prism and a fourth prism. The first prism, the second prism, the third prism, and the fourth prism are respectively rotatable around rotation axes thereof, and a space between the first and second prism sets is adjustable in association with the rotation of the first prism, the second prism, the third prism, and the fourth prism.