LED Control for Image Scanning Heat Management
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Solution Overview
Problem
Image scanning apparatuses using LEDs face challenges with heat dissipation, leading to increased manufacturing costs and space requirements for high-performance LEDs, while using low-performance LEDs results in uneven light emission and higher costs.
Innovation Solution
An image scanning apparatus with a control unit that alternately turns on and off multiple LEDs, controlling their turn-on duty to be at least 50% and frequency within 50 kHz to 200 kHz, using a light guide unit to diffuse light and sense image data, reducing heat generation and the need for large heat dissipation plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-performance LEDs are used as light sources, then light emission performance is improved, but heat dissipation requirements increase leading to larger heat dissipation plates and higher manufacturing costs
Solution Approach 1:
The patent applies periodic action by alternately turning on and off multiple LEDs in a cyclic manner. The control unit controls a plurality of LEDs to be turned on or off alternately, with each LED being turned on for a duty cycle of at least 50%. This periodic operation allows each LED to rest and cool down during the intervals when other LEDs are active, effectively managing heat dissipation without requiring large heat dissipation plates or incurring higher manufacturing costs.
2Illumination intensity
If high-performance LEDs are used as light sources, then light emission performance is improved, but the apparatus requires larger space for heat dissipation plates
Solution Approach 1:
The patent applies periodic action by alternately turning on and off multiple LEDs in a cyclic manner. The control unit controls a plurality of LEDs to be turned on or off alternately, with each LED being turned on for a duty cycle of at least 50%. This periodic operation allows each LED to rest and cool down during the intervals when other LEDs are active, effectively managing heat dissipation without requiring large heat dissipation plates or incurring higher manufacturing costs.
3Ease of manufacture
If low-performance LEDs are used as light sources, then manufacturing cost is reduced, but light emission uniformity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the light source system into multiple independent LEDs that are controlled separately. Instead of using a single low-performance LED or treating all LEDs uniformly, the control unit individually manages the turning on and off of each LED, allowing for optimized control of each segment to achieve uniform light emission while using cost-effective LEDs.
Solution Approach 2:
The patent applies periodic action by alternately turning on and off multiple LEDs in a cyclic manner. The control unit controls a plurality of LEDs to be turned on or off alternately, with each LED being turned on for a duty cycle of at least 50%. This periodic operation allows each LED to rest and cool down during the intervals when other LEDs are active, effectively managing heat dissipation without requiring large heat dissipation plates or incurring higher manufacturing costs.
4Stability of the object's composition
If LEDs are continuously turned on to maintain high turn-on duty, then light emission consistency is improved, but heat generation increases
Solution Approach 1:
The patent applies periodic action by alternately turning on and off multiple LEDs in a cyclic manner. The control unit controls a plurality of LEDs to be turned on or off alternately, with each LED being turned on for a duty cycle of at least 50%. This periodic operation allows each LED to rest and cool down during the intervals when other LEDs are active, effectively managing heat dissipation without requiring large heat dissipation plates or incurring higher manufacturing costs.
Solution Approach 2:
The patent applies merging by combining multiple LEDs into a coordinated system where they operate in alternation. Instead of treating each LED independently, the control unit synchronizes their operation so that when one LED is off and cooling down, another LED is active, effectively merging their operational cycles to maintain continuous light emission while managing heat generation.
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 approach effectively manages LED temperature, reduces manufacturing costs, and ensures uniform light emission, preventing flickering and improving image quality while making large heat dissipation plates optional.
Implementation Method 1
a light guide unit that diffuses the light emitted by the light sources
Implementation Method 2
a sensor unit that senses image data from the document by recognizing light reflected from the document by being diffused by the light guide unit
Data Source
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AI summary
An image scanning apparatus and method are provided. The image scanning apparatus scans an image of a document and converts the scanned image into digital data, and includes light sources that emit light. The apparatus includes a light guide unit that diffuses the light emitted by the light sources and a sensor unit that senses image data from the document by recognizing light reflected from the document by being diffused by the light guide unit. The apparatus includes a control unit that controls the turning on of the light sources. The control unit alternately turns on or off the light sources such that at least one of the light sources is turned on when at least one other light source is turned off.