Projector Cooling Fan Speed Control for Housing Temperature
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Solution Overview
Problem
Projectors require a cool-down period after use, which can be inconvenient for users, as they may remain hot and uncomfortable to touch, and existing solutions do not effectively shorten this period without compromising component durability.
Innovation Solution
A projector with a control unit that allows for gradual cooling by decreasing light source luminance or increasing cooling fan speed between the first and second ending operations, providing user flexibility in cooling time and including guidance for operation, with the option to restore original settings if an incorrect operation is performed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cooling fan continues operation after light source is turned off to cool down the housing, then component durability is improved, but the cooling period extends and usability deteriorates
Solution Approach 1:
The cooling fan's rotational speed is dynamically adjusted based on real-time temperature detection. After the light source is turned off, the fan operates at high speed initially for rapid cooling, then gradually reduces speed as the housing temperature decreases, eliminating the need for prolonged fixed-speed cooling operation
Solution Approach 2:
A temperature detection unit continuously monitors the housing temperature and provides feedback to the control unit, which adjusts the cooling fan's operational parameters accordingly. This closed-loop control ensures cooling stops precisely when the housing reaches a safe temperature, minimizing unnecessary cooling time
2Ease of operation
If the cooling period is shortened or eliminated to improve usability, then user convenience improves, but the housing remains at high temperature causing discomfort
Solution Approach 1:
The cooling fan is activated in advance and maintains operation during the light source's working period, performing preliminary cooling before the light source is turned off. This head start reduces the additional cooling time needed after shutdown, allowing quicker safe handling
3Ease of operation
If a two-step ending operation is implemented to provide cooling control flexibility, then user convenience improves, but device complexity increases
Solution Approach 1:
The system automatically manages the cooling process based on simple user input. When the user initiates the ending operation, the control unit autonomously adjusts fan speed, monitors temperature, and determines when cooling is sufficient, eliminating the need for complex user decisions while providing flexible 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 solution allows users to control the cooling period based on their convenience, improving usability by enabling either extended or immediate shutdown, while ensuring safe handling and easy operation, even for unfamiliar users, and allows for easy cancellation of accidental operations.
Implementation Method 1
a cooling fan which cools the image projection unit
Implementation Method 2
an image projection unit which modulates light emitted from a light source
Data Source
AI summary
A projector includes: an image projection unit which modulates light emitted from a light source and projects the modulated light; a cooling fan which cools the image projection unit; a light source control unit which controls lighting of the light source; a cooling control unit which controls operation of the cooling fan; an input operation unit which receives input operation; and a control unit which allows the light source control unit to decrease the luminance of the light source or allows the cooling control unit to increase the rotational speed of the cooling fan during the period from the time when the input operation unit receives the first ending operation to the time when the input operation unit receives the second ending operation.