Projection System Deflector Placement for Compact Optical Design
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Solution Overview
Problem
Existing projection systems face challenges in reducing the size of the first optical system while maintaining projection quality when the projection distance is shortened, leading to space constraints and increased aberrations.
Innovation Solution
Incorporating a deflector in the first optical system and a concave reflection surface in the second optical system, with the deflector positioned in an air gap with the largest axial inter-surface distance, allowing the first optical axis sections to intersect and reducing the overall length of the second optical section, enabling a compact design and minimizing aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the projection distance is shortened, then the distance between the first optical system and the screen decreases, but the size of the first optical system needs to be reduced which increases aberrations
Solution Approach 1:
The patent introduces a deflector that changes the optical path direction, allowing the light flux to travel in a folded path rather than a straight line. This dimensional change in the optical path enables the first optical system to maintain its required size while achieving a shorter projection distance, thereby avoiding the need to reduce the optical system size which would cause increased aberrations.
Solution Approach 2:
The deflector acts as an intermediary element that mediates between the first optical system and the screen. By placing the deflector in the optical path, it enables the light flux to be redirected, effectively decoupling the physical size of the first optical system from the projection distance, thus allowing short projection distance without compromising aberration control.
2Length of moving object
If the size of the first optical system is reduced, then the projection distance can be shortened, but projection quality deteriorates due to increased aberrations
Solution Approach 1:
The deflector introduces a directional change in the optical path, effectively adding a spatial dimension to the light flux trajectory. This allows the first optical system to maintain its design size and optical quality while the overall projection distance is reduced through the folded optical path, preventing projection quality deterioration.
Solution Approach 2:
The deflector serves as a mediating component that allows the first optical system to remain unchanged in size while achieving compact projection. By inserting the deflector into the optical path, the system maintains its original optical quality without requiring size reduction, thus avoiding projection quality deterioration.
3Volume of stationary object
If the first optical system size is reduced, then space constraints are alleviated, but chromatic aberrations increase
Solution Approach 1:
The deflector changes the spatial arrangement of the optical path, allowing the first optical system to maintain its volume and optical properties while achieving a more compact overall configuration. This prevents chromatic aberrations from increasing while still addressing space constraints through the folded optical path.
Solution Approach 2:
The deflector acts as an intermediary that decouples the relationship between optical system volume and projection distance. By introducing this mediating element, the system can maintain its original volume and chromatic aberration characteristics while achieving space efficiency through the redirected optical path.
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 allows for a reduction in the size of the first optical system, maintains projection quality, and reduces chromatic aberrations, while enabling adjustable focusing through movable lenses, accommodating various projection distances.
Implementation Method 1
a deflector, and a second optical system including an optical element having a concave reflection surface
Implementation Method 2
The reflection mirror deflects a light flux incident from the side facing the first optical system back toward the first optical system
Implementation Method 3
The first optical system is a refractive optical system including a plurality of lenses
Data Source
AI summary
A projection system includes a first optical system including a plurality of lenses and a deflector, and a second optical system including an optical element having a concave reflection surface and disposed at the enlargement side of the first optical system. The deflector is disposed in one air gap of a plurality of air gaps provided between the lenses adjacent to each other in the first optical system, the air gap having the largest axial inter-surface distance in the first optical system. The first optical system includes a first section located at the reduction side of the deflector and a second section located at the enlargement side of the deflector. A first optical axis section of the first section and a second optical axis section of the second section intersect each other. The second section includes three or more lenses. The second section is shorter than the first section.