Work Head LED Switching for Imaging and Luminance Recovery
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Solution Overview
Problem
The luminance of LED packages in work heads is reduced due to gases entering the sealing resin, which affects their performance in imaging and lighting operations.
Innovation Solution
A work head with an LED package that can be selectively turned on in two modes: one for imaging and one for luminance recovery, controlled by a program to recover luminance when imaging is not performed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the LED package is continuously turned on to maintain luminance, then the luminance is maintained, but the LED package is exposed to high temperatures and gases that reduce its lifespan
Solution Approach 1:
The LED package is operated periodically with alternating periods of being turned on and off. During imaging operations, the LED is turned on to provide illumination. During non-imaging periods, the LED is turned off to prevent degradation from heat and gas exposure. This periodic operation pattern maintains luminance when needed while extending overall lifespan by reducing cumulative exposure to harmful conditions.
2Reliability
If the LED package is turned off when not in use to extend lifespan, then reliability is improved, but luminance cannot be maintained when needed
Solution Approach 1:
The system uses feedback control to monitor imaging operation status and automatically control the LED package switching. When imaging is detected as active, the LED is turned on to provide necessary illumination. When imaging is inactive, the LED is turned off to preserve lifespan. This feedback mechanism ensures luminance is maintained precisely when needed while maximizing reliability during non-critical periods.
3Illumination intensity
If the LED package is turned on in second mode without imaging to recover luminance, then luminance is recovered, but energy is consumed unnecessarily
Solution Approach 1:
The LED package serves dual purposes: it provides imaging illumination when needed and simultaneously performs self-maintenance by recovering luminance during non-imaging periods. The same LED component that illuminates during imaging also recovers its own luminance by being turned on during idle periods, eliminating the need for separate maintenance lighting systems and reducing overall energy consumption.
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 allows for effective luminance recovery of LED packages by selectively turning them on when imaging is not needed, thereby maintaining their functionality and reducing damage from high temperatures.
Implementation Method 1
an LED package configured to be used by an imaging device, in which the LED package is turned on selectively in a first mode in which the LED package is turned on when imaging is performed by the imaging device
Implementation Method 2
a second mode in which the LED package is turned on when imaging is not performed by the imaging device... to recover luminance of the LED package by turning on the LED package in the second mode
Data Source
AI summary
A work head for performing work on a board in a board work machine includes: an LED package configured to be used by an imaging device, in which the LED package is turned on selectively in a first mode in which the LED package is turned on when imaging is performed by the imaging device and a second mode in which the LED package is turned on when imaging is not performed by the imaging device.