Light Source Device Cooling via Segmented Flow Paths
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Solution Overview
Problem
Existing light source devices for projection-type display devices, such as projectors, face challenges in efficiently cooling the bulb to maintain optimal temperature, leading to potential clouding, blackening, luminance reduction, and emission abnormalities due to uneven temperature distribution, especially when the device is installed upside down.
Innovation Solution
A light source device with a luminous tube, reflector, and air blowing device, featuring separate flow paths and a movable plate that adjusts gas flow to ensure efficient cooling of the bulb, regardless of installation orientation, by directing gas flows along the inner surface of the reflector to specific hemispherical parts of the bulb, thereby reducing temperature differences and maintaining optimal temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the entire bulb is uniformly cooled, then the cooling structure is simple, but a temperature difference of about 100 to 150°C is generated between the upper side and the lower side of the bulb, causing insufficient cooling of the upper side
Solution Approach 1:
The cooling structure is divided into multiple independent flow paths (first flow path, second flow path, third flow path) that can be independently controlled. Each flow path targets specific regions of the bulb, allowing differential cooling control to maintain temperature uniformity while keeping each individual flow path relatively simple
Solution Approach 2:
Different flow paths are designed to cool different regions of the bulb with different cooling intensities. The first flow path cools the upper side, the second flow path cools the lower side, and the third flow path provides additional cooling as needed. This local quality approach ensures uniform temperature distribution by addressing the specific thermal needs of each bulb region
2Temperature
If a wind direction control plate is disposed in the duct to change the direction of cooling air, then the upper side of the bulb can be cooled intensively even when upside down, but the traveling direction of cooling air is bent causing flow dispersion and reduced cooling efficiency
Solution Approach 1:
Instead of using a single bent duct with a wind direction control plate, the cooling system is segmented into multiple separate flow paths. Each flow path has its own outlet positioned to directly target specific bulb regions, eliminating the need for sharp bends and wind direction control plates while maintaining the ability to cool the upper side effectively
Solution Approach 2:
Multiple flow paths act as intermediaries between the cooling air source and the bulb surface. Each flow path provides a direct, dedicated route for cooling air to reach its target region, avoiding the flow dispersion caused by sharp bends in a single duct system
3Temperature
If the duct for guiding cooling air is bent by about 90° near the inlet, then the cooling air can be directed toward the bulb, but the duct structure becomes complex and the duct size is enlarged
Solution Approach 1:
The single bent duct is segmented into multiple separate flow paths, each with its own outlet. This eliminates the need for complex 90° bends in a single duct while maintaining effective cooling air direction control through multiple direct paths to different bulb regions
Solution Approach 2:
Instead of bending the duct in one dimension (90° bend), the system uses multiple flow paths arranged in different spatial dimensions. Each flow path provides a direct route to its target region, achieving three-dimensional cooling coverage without the complexity of sharp bends
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 ensures efficient cooling of the bulb, preventing temperature-related issues like clouding and emission abnormalities, and extends the life of the bulb by maintaining optimal temperatures across its vertical axis, regardless of installation orientation.
Implementation Method 1
an air blowing device that generates a flow of gas to cool the luminous tube
Implementation Method 2
a lamp including a bulb that generates light by electric discharging
Data Source
AI summary
Provided is a light source device capable of effectively cooling a bulb included therein. The light source device includes: a luminous tube having a bulb to seal a pair of electrodes that generates light by electric discharging; a reflector formed into a concave surface shape and configured to emit light from the bulb; and an air blowing device that generates a flow of gas to cool the luminous tube. The light source device includes: a first flow path for jetting out gas along the inner surface of the reflector to a first hemispherical part located far from the installation surface of the bulb; a second flow path for jetting out gas along the inner surface of the reflector to a second hemispherical part located near the installation surface of the bulb; and a movable plate for separating the first flow path and the second flow path from each other to form a part of each flow path, adjusts the amount of gas flowing into each flow path to adjust the ratio of the air flow in each flow path, and gradually narrows the flow path area in the flow path adjusted to increase the air flow in the gas jetting-out direction.