Bi-directional Projection Apparatus Using Beam Splitter
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Solution Overview
Problem
Conventional projection apparatuses can only project images in one direction, leading to poor visibility for audiences far from the screen, especially in large venues, and require multiple units or large beam splitters, increasing costs and space requirements.
Innovation Solution
A projection apparatus with a bi-directional projection function is achieved using an illumination system, a light valve, a first optical element with reflecting, splitting, and transmission portions, and two projection lenses, allowing part of the image beam to pass through and another part to be reflected, enabling simultaneous projection onto two screens without the need for additional units or large beam splitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a beam splitter is added to enable bi-directional projection, then projection versatility is improved, but device complexity and space occupation increase
Solution Approach 1:
The single projection apparatus is designed to perform multiple projection directions by incorporating a beam splitter that divides the light path into two separate projection paths, allowing one device to function as multiple projection units simultaneously
Solution Approach 2:
A beam splitter is introduced as an intermediary optical element between the light source and projection lenses, mediating the light path to enable division into multiple projection directions without requiring multiple independent projection apparatuses
2Adaptability or versatility
If a beam splitter is added to enable bi-directional projection, then projection versatility is improved, but the required space increases due to supporting structure
Solution Approach 1:
Multiple projection functions are merged into a single integrated apparatus by combining the beam splitter with the projection lenses and light source, eliminating the need for separate supporting structures and reducing overall space requirements
3Adaptability or versatility
If a beam splitter is used for bi-directional projection, then cost is reduced compared to multiple apparatuses, but image focus quality deteriorates on one screen
Solution Approach 1:
The projection system incorporates adjustable projection lenses that can dynamically focus light beams along different optical paths, allowing independent focus adjustment for each projection direction to maintain sharp images on both screens simultaneously
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 allows for clear, simultaneous projection onto multiple screens with flexible throw ratios and adjustable projection directions, reducing costs and space requirements while maintaining image clarity, and enabling convenient setup with no distance limitations between screens.
Implementation Method 1
A portion of the image beam is reflected by the first optical element
Implementation Method 2
a remaining portion of the image beam passes through the first optical element
Data Source
AI summary
A projection apparatus including an illumination system, a light valve, a first optical element, a first projection lens, and a second projection lens is provided. The illumination system is suitable to provide an illumination beam, and the light valve is disposed on a transmission path of the illumination beam. The light valve is suitable to convert the illumination beam into an image beam. The first optical element is disposed on a transmission path of the image beam. A portion of the image beam is reflected by the first optical element, and a remaining portion of the image beam passes through the first optical element. The first projection lens is disposed on a transmission path of the image beam passing through the first optical element, and the second projection lens is disposed on a transmission path of the image beam reflected by the first optical element.