Projection Optical System Compact Design via Asymmetric Mirrors
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Solution Overview
Problem
Conventional projection display devices with wide-angle projection optical systems often require large lenses, leading to increased projector size and instability due to uneven surfaces, making them prone to tipping over when placed on a table.
Innovation Solution
A projection optical system comprising a first refracting optical system with multiple lenses, a first reflecting optical system with positive optical power disposed on the projection port side of the optical axis, and a second reflecting optical system to redirect light, eliminating the need for a large step portion and ensuring stable placement on a surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a wide-angle lens with a large angle of view is used to shorten throw distance and enable tilt projection, then the projection angle is improved, but the size of the projector main body increases due to the larger lens size
Solution Approach 1:
The projection optical system is divided into multiple components: a standard-angle projection lens, a first reflection mirror, and a second reflection mirror. This segmentation allows the use of a smaller projection lens while achieving wide-angle projection through the combined optical paths of multiple elements, thereby reducing the overall projector size while maintaining short throw distance capability
Solution Approach 2:
The invention introduces reflection mirrors to change the optical path direction, effectively utilizing three-dimensional space within the projector housing. By folding the optical path through strategic mirror placement, the system achieves wide-angle projection without requiring a proportionally larger lens, thus reducing the projector main body volume while maintaining short throw distance
2Length of moving object
If the reflection mirror is disposed on the lower side with respect to the optical axis, then wide-angle projection is achieved, but a large step portion is formed causing the projector to sit unstably on a table
Solution Approach 1:
The invention employs asymmetric placement of reflection mirrors relative to the optical axis, specifically positioning them on the upper side rather than the lower side. This asymmetric configuration achieves the required wide-angle projection while avoiding the formation of large step portions at the bottom, thereby ensuring the projector sits stably on a table surface without requiring additional leg support
Solution Approach 2:
By relocating the reflection mirrors to the upper side of the optical axis and utilizing vertical space more effectively, the invention redistributes the optical components in a way that eliminates the need for compensatory leg portions at the bottom, thus improving stability while maintaining wide-angle projection capability
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
The solution allows for a compact and stable projector design by eliminating the large step portion, enabling the projector to sit stably on a table without the need for additional leg support, while maintaining the ability to project images with a wide angle.
Implementation Method 1
a first refracting optical system (210) having a plurality of lenses
Implementation Method 2
a first reflecting optical system (220) to reflect light incident through the first refracting optical system in a direction opposite to the side of a projection port
Implementation Method 3
a second reflecting optical system (230) for reflecting the light reflected on the first reflecting optical system toward the projection port
Data Source
AI summary
A projection optical system includes a first refracting optical system having a plurality of lenses, a first reflecting optical system, and a second reflecting optical system. The first reflecting optical system is disposed on a side of a projection port with respect to an optical axis of the first refracting optical system, and has a positive optical power to reflect light incident through the first refracting optical system in a direction opposite to the side of the projection port. The second reflecting optical system is operable to reflect the light reflected on the first reflecting optical system toward the projection port.