Rotatable Light Shielding Member for Projector Ventilation and Leakage Control
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Solution Overview
Problem
Data projectors face challenges in maintaining effective ventilation without increasing ventilation resistance and preventing light leakage from the light source unit, while efficiently cooling the high-temperature light source unit.
Innovation Solution
A light source compartment with partitioning walls, an air inlet port, and a rotatable light shielding member with vane portions on a rotational shaft at the air outlet port, which guides cooling air from the fan into the compartment and prevents light leakage by closing the outlet flow path with its vane portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source unit is used in a data projector, then high-intensity light is generated for image projection, but the light source unit becomes high in temperature requiring cooling
Solution Approach 1:
The housing is divided into a light source compartment and a dust cover that can be separately removed. The light source compartment contains the light source unit and is accessible only by removing the dust cover, allowing maintenance and cooling without disassembling the entire device.
Solution Approach 2:
A rotatable light shielding member with vane portions is introduced as an intermediary between the light source storing section and the outside environment. This member can rotate to either shield light from leaking or allow ventilation, mediating between the conflicting requirements of light containment and heat dissipation.
2Object-affected harmful factors
If partitioning walls are used to surround the light source unit, then light leakage is prevented, but ventilation resistance increases
Solution Approach 1:
The light shielding member is made rotatable rather than fixed, allowing it to dynamically change its position. When rotated to a first position, it shields light effectively; when rotated to a second position, it allows ventilation passages to remain open, thus dynamically resolving the contradiction between light shielding and ventilation.
Solution Approach 2:
The ventilation passages are designed with adjustable parameters - the opening and closing of passages can be controlled by rotating the light shielding member. This changes the ventilation resistance parameter dynamically based on whether light shielding or cooling is the priority at any given moment.
3Object-affected harmful factors
If a rotatable light shielding member is added to prevent light leakage, then light shielding is improved, but device complexity increases
Solution Approach 1:
The rotatable light shielding member serves multiple functions: it acts as both a light shield and a ventilation control mechanism. By rotating this single component, the system simultaneously controls both light leakage prevention and ventilation, reducing the need for separate mechanisms and thus minimizing the increase in device complexity.
Solution Approach 2:
The light shielding function and ventilation control function are merged into a single rotatable member. This consolidation means that one component performs what would otherwise require multiple separate mechanisms, thereby limiting the increase in overall device complexity while achieving both light shielding and ventilation control.
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 design effectively reduces ventilation resistance and prevents light leakage while maintaining high cooling efficiency and low noise levels, ensuring the projector operates without external light interference.
Implementation Method 1
a cooling fan which draws in outside air from the air inlet holes 8, and discharges the air to the air outlet holes 7
Implementation Method 2
the vane portions 155 of the pinwheel member 151 close the outlet flow path 141, light from a light source unit 61 is cut off so as to allow no light leakage from the light source storing section 121
Data Source
AI summary
A protector is provided which can prevent the leakage of light from a light source lamp to the outside of the projector and which can discharge air that has cooled a light source unit to the outside of the projector with a small ventilation resistance. A light source compartment storing a light source unit according to the invention includes a light source storing section which is defined by partitioning walls which surround the light source unit, an air inlet port which is provided in part of the partitioning walls to let in air discharged from a cooling fan and a rotatable light shielding member having a plurality of vane portions on a rotational shaft thereof which is provided in an air outlet port formed in part of the partitioning walls to let out air.