Projector Field Lens Optical Angle Reducing Thickness
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Solution Overview
Problem
Projectors face challenges in reducing thickness while maintaining high-quality image projection, as existing optical systems are bulky and inefficient in minimizing the thickness of illumination and projection lenses.
Innovation Solution
The projector optical system incorporates a field lens that changes the optical angle of light between illumination and projection lenses, allowing for a compact design by interposing the field lens between the illumination and display devices, and between the projection lenses and the display device, aligning or differing the optical axes of the illumination and projection lenses to reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional illumination and projection optical systems are used, then high-quality image projection is achieved, but the projector thickness becomes large
Solution Approach 1:
The patent reconfigures the optical path from a conventional horizontal arrangement to a vertical arrangement with downward illumination and projection. The illumination lenses illuminate light downward onto the display device, and the projection lenses project light downward onto the screen. This dimensional change allows the optical components to be stacked vertically rather than arranged horizontally, significantly reducing the thickness of the projector while maintaining optical performance
Solution Approach 2:
The patent introduces a field lens as an intermediary component between the illumination lenses and the display device, and between the projection lenses and the display device. This field lens changes the optical angle of the light, enabling compact design by allowing the illumination and projection optical paths to share common components and space, thereby reducing the overall thickness of the projector
2Length of stationary object
If the optical system is compacted to reduce thickness, then projector size is reduced, but illumination and projection efficiency deteriorates
Solution Approach 1:
The patent optimizes the local optical properties at different positions in the optical path. The illumination lenses are specifically designed to illuminate light downward with appropriate convergence, the field lens is positioned to change the optical angle at the critical interface between illumination and display, and the projection lenses are configured for efficient downward projection. Each component has its optical center and characteristics optimized for its specific location and function, maintaining high efficiency in the compact configuration
Solution Approach 2:
The patent changes key optical parameters including the optical angle of light through the field lens, the positioning of optical centers of the lenses, and the relative positions of the illumination and projection optical axes. By adjusting these parameters, the system achieves efficient light utilization in a compact thickness, preventing efficiency deterioration that would normally accompany size reduction
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 significantly reduces the thickness of both illumination and projection lenses, resulting in a thinner, lighter projector capable of high-quality downward projection and illumination.
Implementation Method 1
a field lens changing an optical angle of the light illuminated from the illumination lenses and emitting the light to the display device, and changing an optical angle by receiving an image light of the display device and emitting the light to the projection lenses
Implementation Method 2
an illumination unit including illumination lenses illuminating light downwards
Implementation Method 3
projection lenses downwardly projecting light emitted from the display device to a screen
Data Source
AI summary
A projector optical system is provided, the system including an illumination unit including illumination lenses illuminating light downwards, a display device receiving light illuminated from the illumination lenses to enable to realize an image, projection lenses downwardly projecting light emitted from the display device to a screen, and a field lens changing an optical angle of the light illuminated from the illumination lenses and emitting the light to the display device, and changing an optical angle by receiving an image light of the display device and emitting the light to the projection lenses.