Projection Device Heat Dissipation via Rear Axial Fan Placement
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Solution Overview
Problem
Current projection devices face issues with heat dissipation due to wind shear and noise generation, increased volume, and difficulty in cable installation, primarily because of the close proximity of air outlets to the light source module and the need for additional fans, which complicates airflow and heat management.
Innovation Solution
The design includes a housing with a light source module and an optical engine module where the optical engine dissipation fin is positioned above the light-modulating device, allowing for a larger space for light source dissipation fins and eliminating the need for heat pipes, while axial fans are used to improve airflow and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If two axial fans are disposed on the front side of the light source module to increase airflow for cooling, then the cooling performance is improved, but the overall volume of the projection device is increased and the air inlet area is reduced
Solution Approach 1:
The patent changes the arrangement dimension of the axial fans from the front side (horizontal dimension) to the rear side (vertical dimension relative to light transmission path). This dimensional change allows the fans to be positioned in the vertical space between the light source module and the rear plate, avoiding horizontal space occupation and maintaining a compact overall volume while still providing effective cooling airflow to the light source module
2Volume of moving object
If the light source module is tilted towards the rear plate to accommodate axial fans, then space for fans is created, but the distance between air inlets and projection screen is decreased, reducing heat dissipation efficiency
Solution Approach 1:
Instead of tilting the light source module in the horizontal plane (which would reduce the distance to the projection screen), the patent positions the axial fans in the vertical dimension at the rear side. This allows the light source module to maintain its optimal orientation and distance from the projection screen while still accommodating the cooling fans in the vertical space, thereby preserving heat dissipation efficiency
3Speed
If guide members are added at air outlets to guide and discharge airflow, then airflow direction is controlled, but costs and flow resistance are increased and system noise is likely to increase
Solution Approach 1:
The patent extracts and eliminates the guide members from the air outlet structure. By removing these additional components, the design reduces flow resistance, lowers system noise, and decreases manufacturing costs. The natural airflow generated by the axial fans positioned at the rear side provides sufficient directional control without requiring additional guide members
4Adaptability or versatility
If speakers are disposed between system fans and air outlets, then audio functionality is added, but wind shear occurs and noise is generated due to high static-pressure and low airflow
Solution Approach 1:
The patent extracts the speakers from the problematic position between the system fans and air outlets. By relocating the speakers to a different position in the housing, the design eliminates the wind shear effect that occurs when high static-pressure airflow passes through the speaker grilles, thereby reducing noise generation while still maintaining audio functionality
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 enhances heat dissipation efficiency, reduces system noise, and simplifies installation by minimizing the system depth and flow resistance, resulting in improved cooling performance and reduced size.
Implementation Method 1
the optical engine dissipation fin is disposed above the supporting surface corresponding to the light-modulating device... the light-modulating device is located between the optical engine dissipation fin and the light source dissipation fin
Implementation Method 2
light source heat dissipation module connected to the light source... optical engine dissipation fin... light source dissipation fin
Data Source
AI summary
The invention provides a projection device including a housing, a light source module, an optical engine module, and a projection lens. The light source module includes a light source and a light source heat dissipation module. The light source heat dissipation module includes a light source dissipation fin. The optical engine module is located on a light transmission path of a light emitted from the light source. The optical engine module includes a light-modulating device and an optical engine dissipation fin. An extension direction of a supporting surface of the light-modulating device is parallel to an upper casing or an lower casing of the housing. The optical engine dissipation fin is disposed above the supporting surface of the light-modulating device. The light-modulating device is located between the optical engine dissipation fin and the light source dissipation fin. The projection lens is connected to the optical engine module.