LED Illumination Device Dual Heat Radiation Plates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional image reading devices using LEDs as illumination sources face challenges with heat management, leading to temperature rises that can reduce light output, change chromaticity, and potentially lead to LED breakdown, especially when compactness is required.
Innovation Solution
A linear illumination device configuration that includes an LED, an elongated light guide member, a fan, and dual heat radiation plates, where the fan blows air against the heat radiation plates to efficiently manage heat without increasing the device's size, maintaining the LED's temperature within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single metal heat radiation member is tightly fitted to the LED substrate, then heat radiation property is improved, but the temperature rise of the heat radiation member increases which reduces heat transfer efficiency
Solution Approach 1:
The heat radiation member is divided into a first heat radiation plate and a second heat radiation plate that are disposed on opposite sides of the LED substrate. This segmentation allows each plate to have a smaller surface area, improving heat transfer efficiency while collectively providing sufficient heat radiation capability.
Solution Approach 2:
The invention transitions from a single-plane heat radiation approach to a three-dimensional configuration where heat radiation plates are positioned on both sides of the LED substrate, utilizing spatial dimensions to improve heat dissipation efficiency.
2Temperature
If a heat radiation member with larger area is used to enhance heat radiation property, then heat radiation efficiency is improved, but the volume of the entire device increases
Solution Approach 1:
The heat radiation function is segmented into two separate plates positioned on opposite sides of the LED substrate. This allows the total heat radiation surface area to be distributed rather than concentrated, achieving effective heat dissipation without requiring a large single-area heat radiation member that would increase device volume.
Solution Approach 2:
By utilizing both sides of the LED substrate for heat radiation, the invention effectively doubles the heat radiation surface area without proportionally increasing the device volume, as the plates are positioned in the z-dimension (thickness direction) rather than expanding the x-y plane dimensions.
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 effectively suppresses temperature rises in the LED, maintaining its performance and extending its lifespan without increasing the device's size, ensuring reliable operation and compactness.
Implementation Method 1
a fan (70) for suppressing a temperature rise of the LED; wind from the fan is blown against the first and second heat radiation plates
Implementation Method 2
a first heat radiation plate (43) that releases heat generated from the LED (49) from a surface of the LED substrate (41) opposite to a surface on which the LED is mounted; and a second heat radiation plate (47) that releases heat generated from the LED (49) from the surface of the LED substrate (41) on which the LED is mounted
Data Source
AI summary
Provided are: an illumination device having a configuration in which a temperature rise of a radiation member is suppressed in a limited volume to thereby maintain a temperature of an LED at a predetermined value or less and an image reading device provided with the illumination device. In order to release heat generated by the LED from a substrate on which the LED is mounted, a first heat radiation plate (43) and a second heat radiation plate (47) are provided on both sides of the LED-mounted substrate; the second heat radiation plate (47), the LED-mounted substrate, and the first heat radiation plate (43) are installed in this order on a second frame (40) that supports the LED-mounted substrate, first and second heat radiation plates (43) and (47); a fan is disposed on the first heat radiation plate (43) side; when viewing the second frame (40) in a direction perpendicular to a longitudinal direction thereof, a cross-sectional profile of the second heat radiation plate (47) has an area protruding with respect to a cross-sectional profile of the first heat radiation plate (43); and the configuration is such that wind from the fan is aggressively blown against the first and second heat radiation plates (43) and (47).