Projector Exhaust Deflection Member Prevents Image Obscurity
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Solution Overview
Problem
Short focus projectors face image obscurity due to high-temperature air discharge overlapping with image light, as the discharged air spreads and overlaps with the image light, degrading image quality.
Innovation Solution
The projector design includes a main body cabinet with a projection port and air outlets on opposing surfaces, featuring an exhaust unit with a deflection member that directs discharged air away from the projection plane, preventing overlap with image light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air outlet is formed in main body cabinet to discharge warmed air, then heat generating members are cooled effectively, but discharged high-temperature air overlaps with image light causing image obscurity
Solution Approach 1:
The harmful factor (high-temperature discharged air) is extracted and separated from the image light path by forming the air outlet in a surface facing away from the projection port, preventing the air from overlapping with the projected image
Solution Approach 2:
The air outlet is positioned in a different spatial dimension (opposing surface) relative to the projection port, creating spatial separation between the exhaust air flow and the image light path, thus eliminating the harmful overlap
2Power
If exhaust fan discharges air through air outlet, then heat exchange with heat generating members is enhanced, but air spreads and overlaps with image light in short focus projector
Solution Approach 1:
The air outlet is specifically positioned in a local area (opposing surface) that is spatially distinct from the image projection area, allowing effective heat exchange locally while preventing harmful effects in the image region
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 effectively prevents high-temperature air from overlapping with image light, maintaining image clarity and quality by directing discharged air in a manner that avoids the projection path, thus enhancing the projector's performance.
Implementation Method 1
an exhaust fan is disposed in a main body cabinet, and air sucked by the exhaust fan is discharged to the outside of the projector
Implementation Method 2
a deflection member which deflects air discharged from the exhaust fan in a direction away from the projection plane
Implementation Method 3
air that has been warmed by heat exchange with the heat generating members
Data Source
AI summary
A projection display device is provided with a main body cabinet; a projection port which is formed in the main body cabinet to guide modulated light to an outside of the projection display device; an air outlet which is formed at least in one of two surfaces of the main body cabinet facing each other across the projection port; and an exhaust unit which discharges, to the outside, air that has been warmed by heat exchange with a member to be cooled which is disposed in the main body cabinet through the air outlet. In this arrangement, the exhaust unit includes an exhaust fan, and a deflection member which deflects air discharged from the exhaust fan in a direction away from the projection plane.