Projection Cooling Layout for Quiet Ultra-Short-Throw Optics
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Solution Overview
Problem
The configuration of ultra-short-throw projection devices is limited by the light dispersion angle, which restricts fan placement, leading to reduced heat dissipation efficiency and increased noise due to the need for larger heat dissipation fins or higher fan speeds.
Innovation Solution
A projection device design with a first heat dissipation module positioned between the air inlet and fan, featuring perpendicular heat pipes and parallel fins, and a fan orientation that reduces noise and enhances space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the fan is moved outside the light dispersion angle to meet heat dissipation needs, then the heat dissipation function is achieved, but the noise increases and heat dissipation performance deteriorates
Solution Approach 1:
The patent repositions the fan from the traditional side-cover location to the upper cover, utilizing the vertical dimension above the light dispersion angle. This spatial reconfiguration allows the fan to draw air from below the light path and exhaust it upward, effectively separating the fan's operational space from the light dispersion cone and reducing noise while maintaining heat dissipation efficiency
2Temperature
If the size of heat dissipation fins is increased to handle higher brightness and heat, then heat dissipation efficiency improves, but the device becomes bulkier
Solution Approach 1:
The patent extends the heat dissipation fins vertically upward toward the upper cover, utilizing the vertical space within the housing rather than expanding horizontally. This vertical extension of the fins increases the heat dissipation surface area without increasing the device's footprint, effectively decoupling heat dissipation capacity from device volume
3Temperature
If the fan's rotation speed is increased to handle higher heat, then heat dissipation efficiency improves, but noise increases
Solution Approach 1:
The patent creates a multi-functional air flow path that serves both optical and thermal management functions. The same air flow that cools the light source also passes over the projection lens, providing lens cooling and preventing condensation simultaneously. This multi-functionality allows effective heat dissipation at lower fan speeds, reducing noise
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
Improved heat dissipation efficiency and reduced noise levels by optimizing fan placement and heat pipe orientation, allowing for increased fin surface area and compact design.
Implementation Method 1
The first heat dissipation module includes a base, at least one first heat pipe, and multiple heat dissipation fins. The base is connected to the first light source module. The first heat pipe is perpendicular to the base
Implementation Method 2
The first fan has an air outlet surface facing the upper cover and an air inlet surface facing the lower cover. The first heat dissipation module is located between the first air inlet and the first fan
Data Source
AI summary
A projection device including a housing, a projection lens, a first light source module, a first heat dissipation module, and a first fan. A lower cover, a first side cover, and a second side cover of the housing respectively include a first air inlet, a second air inlet, and an air outlet. The projection lens has a disposition direction to divide an accommodating space in the housing into first and second regions. The first heat dissipation module includes a base, at least one first heat pipe, and heat dissipation fins. The first heat pipe is perpendicular to the base, and the heat dissipation fins are parallel to the base. Air outlet and inlet surfaces of the first fan respectively faces the upper and lower covers. An angle between a normal extension direction of the air inlet surface and the first air inlet falls between 30 degrees to 150 degrees.