Projector Optical Element Layout for Peripheral Image Illumination
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Solution Overview
Problem
Existing projection optical systems face limitations in ensuring adequate light intensity in the periphery of projected images due to the use of aperture diaphragms, which can either block peripheral light or cause it to miss the screen when the aperture diameter is enlarged.
Innovation Solution
The optical system employs a first optical element with a first transmission surface having power, where peripheral light is tilted to approach the screen as it moves away from the transmission surface, and a second optical element with specific tilting and aspherical shapes to ensure light reaches the periphery of the projected image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture diameter of the aperture diaphragm is increased to ensure light amount in the periphery of the enlarged image, then the light intensity in the periphery is improved, but the projection light runs off the area facing to the screen side and peripheral light cannot reach the screen
Solution Approach 1:
The first transmission surface is designed with a convex spherical shape having a specific radius of curvature. This curved surface redirects peripheral light rays that would otherwise run off the optical element toward the screen, bending them back into the effective optical path while maintaining proper focus and image quality
Solution Approach 2:
The radius of curvature of the first transmission surface is specifically optimized to balance two competing requirements: ensuring peripheral light reaches the screen while maintaining acceptable image quality. By adjusting this geometric parameter, the system achieves adequate peripheral illumination without compromising image sharpness or causing excessive aberrations
2Manufacturing precision
If the aperture diameter of the aperture diaphragm is kept small to maintain image quality, then the projection light stays within the effective area, but the periphery of the enlarged image becomes dark due to blocked peripheral light
Solution Approach 1:
The convex spherical first transmission surface acts as a light redirecting element that captures peripheral light rays blocked by a small aperture diaphragm and bends them toward the screen. This curvature allows the system to use a smaller aperture while still achieving adequate peripheral illumination by redirecting the light path rather than blocking it
Solution Approach 2:
The first transmission surface with convex spherical shape serves as an intermediary optical element between the aperture diaphragm and the screen. It mediates the interaction between the limited aperture opening and the need for peripheral light delivery, redirecting light rays to achieve both image quality and peripheral illumination
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 enhances light intensity in the periphery of projected images by redirecting peripheral light to reach the screen, improving image quality and resolution.
Implementation Method 1
The first transmission surface has power. Light passing between the first transmission surface and the first reflecting surface includes peripheral light tilted in a direction of getting away from an enlargement-side conjugated plane as coming closer to the first transmission surface. The peripheral light is tilted in a direction of coming closer to the enlargement-side conjugated plane as getting away from the first transmission surface between the first transmission surface and the enlargement-side conjugated plane.
Data Source
AI summary
An optical system includes a first optical element. The first optical element has a first transmission surface, a first reflecting surface arranged at a reduction side of the first transmission surface, and a second transmission surface arranged at the reduction side of the first reflecting surface. The first transmission surface has power. Light passing between the first transmission surface and the first reflecting surface includes peripheral light tilted in a direction of getting away from an enlargement-side conjugated plane as coming closer to the first transmission surface. The peripheral light is tilted in a direction of coming closer to the enlargement-side conjugated plane as getting away from the first transmission surface between the first transmission surface and the enlargement-side conjugated plane.