Projector With Tilted Image Plane And Angle-Widening Mirror
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Solution Overview
Problem
Existing projectors for ultra-short projection face challenges in achieving high zoom ratios without increasing aberration, and interactive boards using direct view monitors face issues with weight, power consumption, and cost when attempting wide-range displays.
Innovation Solution
A projector design incorporating a main body section with a light source and an emission optical system, combined with a projection unit featuring an angle-widening mirror with a concave surface and a variable power optical system, allowing for ultra-short, medium, and long-distance projections while minimizing aberration and reducing weight, power consumption, and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a high zoom ratio is used in ultra-short projection, then the projection distance is reduced, but the aberration increases and becomes difficult to control
Solution Approach 1:
The projection optical system is divided into a first projection optical system and a second projection optical system. The first system handles ultra-short projection with a tilted image plane, while the second system handles medium and long-distance projection with a parallel image plane. This segmentation allows each subsystem to be optimized for its specific function, controlling aberration in the ultra-short system while maintaining versatility through the second system.
Solution Approach 2:
The patent introduces a tilted image plane dimension for ultra-short projection, departing from the conventional parallel image plane. By allowing the image plane to be tilted relative to the screen, the system achieves ultra-short projection distances while managing aberration through the specific optical configuration of the first projection optical system.
2Adaptability or versatility
If an eccentric optical system with curved mirrors is used to increase zoom ratio, then projection flexibility is improved, but the adjustment complexity and manufacturing precision requirements increase significantly
Solution Approach 1:
The projection optical system is segmented into two independent subsystems: a first projection optical system for ultra-short projection and a second projection optical system for medium and long-distance projection. This segmentation eliminates the need for complex eccentric adjustments while maintaining projection flexibility through system selection.
Solution Approach 2:
The patent creates a universal projection system that can perform both ultra-short projection and medium/long-distance projection by incorporating two projection optical systems. This multi-functionality is achieved through system integration rather than complex adjustable mechanisms, reducing adjustment complexity while maintaining versatility.
3Area of stationary object
If a direct view monitor is used for wide-range display in interactive boards, then display capability is achieved, but the weight, power consumption, and cost increase
Solution Approach 1:
Instead of using a direct view monitor that physically displays the image, the patent uses a projector to create an optical copy of the image on a screen. This copying approach allows wide-range display while significantly reducing the weight, power consumption, and cost compared to a direct view monitor of equivalent display area.
4Ease of operation
If a large planar mirror is used to reflect light in interactive boards, then light redirection is achieved, but the depth size increases and installation facility is degraded
Solution Approach 1:
The patent employs a tilted image plane that redirects light in a different spatial dimension rather than using a large planar mirror. This approach achieves light redirection for screen display while minimizing the depth size, improving installation facility by eliminating the need for large angular mirrors.
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
Enables versatile projection capabilities across various distances with reduced aberration and costs, while maintaining high image quality and convenience, particularly suitable for interactive boards by minimizing depth size and enhancing user experience.
Implementation Method 1
having an angle-widening mirror with a concave surface having positive power and adapted to reflect and widen an angle of light forming an image plane
Data Source
AI summary
A projector includes: a main body section including a light source, a display surface irradiated with light from the light source, and an emission optical system capable of emitting the light from the display surface, and once converting the light from the display surface into light forming an image plane of the display surface tilted with respect to the display surface; and a projection unit projecting the light from the display surface, emitted from the emission optical system, toward an irradiated surface, and having an angle-widening mirror with a concave surface having positive power and reflecting and widening light forming an image plane of the display surface tilted with respect to the display surface. The main body section or the projection unit includes a variable power optical system varying magnification of the image forming the image plane of the display surface tilted with respect to the display surface.