Projection Optical System with Integrated Dustproof Path-Folding Mirror
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Solution Overview
Problem
Conventional projectors face issues with dust deposition and the need for separate dustproof covers that do not fold optical paths, limiting their usability and requiring additional components.
Innovation Solution
A projection optical system that integrates a second optical system with a reflection region and a transmission region, functioning as both a dustproof cover and a path-folding mechanism, allowing the projector to operate without being embedded in the projection surface and preventing foreign matter entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate dustproof cover is provided to protect the optical system, then the optical system is protected against dust deposition, but the device complexity increases due to additional components
Solution Approach 1:
The patent combines the dustproof cover function with the optical path folding mirror into a single integrated component. The second optical system serves dual purposes: it folds the optical path to reduce the projector's overall length while simultaneously acting as a dustproof cover that prevents foreign matter from entering the optical system. This eliminates the need for a separate dustproof cover.
Solution Approach 2:
The second optical system is designed to perform multiple functions: it acts as a folding mirror to change the optical path direction, reduces the projector's effective length, and simultaneously serves as a dustproof cover protecting the first and third optical systems. This multi-functional design simplifies the overall device structure.
2Ease of operation
If the projection distance is reduced to avoid presenter shadows, then the presenter shadow problem is eliminated, but the projector must be embedded in the projection surface which reduces versatility
Solution Approach 1:
The patent uses the second optical system to fold the optical path at an angle, effectively changing the spatial arrangement from a straight-line configuration to a bent configuration. This allows the projector to achieve a shorter effective projection distance in one dimension while maintaining the necessary optical path length, enabling flexible projection distances without requiring embedding in the projection surface.
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 flexible projection distances, reduces shadow issues during presentations, and simplifies assembly by eliminating the need for separate dustproof covers, while maintaining optical system protection and improving focusing performance.
Implementation Method 1
light entering the projection optical system passes through the first optical system to have a path thereof bent by the reflection region of the second optical system
Implementation Method 2
the light incident on the third optical system has the path thereof bent by the third optical system to pass through the transmission region of the second optical system
Data Source
AI summary
A projection optical system configured to project an image onto a projection surface includes a first optical system including at least one dioptric system and having positive power as a whole; a second optical system including a reflection region and a transmission region; and a third optical system including at least one reflecting surface having power, and having positive power as a whole, wherein light entering the projection optical system passes through the first optical system to have a path thereof bent by the reflection region of the second optical system to be incident on the third optical system, and the light incident on the third optical system has the path thereof bent by the third optical system to pass through the transmission region of the second optical system to be incident on the projection surface.