Projector Light Source Unit Rectifying Unit Cooling Airflow
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Solution Overview
Problem
Existing light source units for projectors face cooling inefficiencies in both standing and suspending positions due to inadequate airflow distribution, leading to temperature differences that cause degradation and light leakage, with existing solutions increasing the size of the apparatus and not effectively cooling the lower portions.
Innovation Solution
A light source unit with a rectifying unit that rotates to direct cooling air into both upper and lower flow channels, ensuring balanced cooling and reducing the size of the apparatus by allowing airflow along the optical axis, thus maintaining effective cooling in inverted positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a shutter is used to close one flow channel, then cooling air can be directed to specific areas, but the lower part of the light-emitting tube or holding unit is insufficiently cooled
Solution Approach 1:
The flow channel is divided into multiple independent channels (first flow channel and second flow channel) that can be separately controlled. This segmentation allows cooling air to be distributed to different regions of the light source unit simultaneously, ensuring both upper and lower portions receive adequate cooling without requiring a shutter mechanism.
2Temperature
If the intake port is formed to introduce cooling air in a direction substantially orthogonal to the lighting optical axis, then cooling can be achieved, but the space for the fan is increased
Solution Approach 1:
The intake port is reoriented to allow cooling air to enter from a direction substantially parallel to the lighting optical axis rather than orthogonal to it. This dimensional change in airflow direction enables the fan to be positioned more compactly while still achieving effective cooling of the light source unit.
3Device complexity
If the intake port, openings, and distal end of the light-emitting tube are arranged in a line, then cooling airflow is simplified, but light is liable to leak to the outside
Solution Approach 1:
The flow channel structure is modified to change the local arrangement of the intake port and openings relative to the light-emitting tube. By adjusting the positional relationships and orientations of these components, the design maintains simplified airflow while preventing light from escaping through the same pathways used for cooling air intake.
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
The solution provides a light source unit with a longer lifespan and stable projection performance in both positions by ensuring balanced cooling and reducing the risk of light leakage, while maintaining a compact size.
Implementation Method 1
a discharging type light source such as an extra high pressure mercury lamp is employed. The light source generates heat in association with a light emission, and the temperature of an upper portion thereof is increased to a temperature higher than the temperature of a lower portion thereof due to an influence of heat convection.
Implementation Method 2
the temperature of an upper portion thereof is increased to a temperature higher than the temperature of a lower portion thereof due to an influence of heat convection
Data Source
AI summary
A light source unit including: a light source; a reflector configured to reflect light emitted from the light source; a light source housing configured to accommodate the light source and the reflector, and including an inflow port through which cooling air enters, and a first flow channel and a second flow channel guiding the cooling air entering from the inflow port to an upper portion and a lower portion of the light source respectively; and a rectifying unit configured to rotate and allow the cooling air entering from the inflow port to flow in the first flow channel, wherein the rectifying unit is provided with an opening configured to allow part of the cooling air entering from the inflow port to flow in the second flow channel.