Burn-in Test for Light Source Elements Using Insulation Liquid
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Solution Overview
Problem
The existing burn-in test methods for light source units in thermally-assisted magnetic recording systems are inefficient, requiring a long time to evaluate multiple laser diodes due to challenges in simultaneously contacting power supply probes and effectively dissipating heat, which can lead to inaccurate evaluations and potential damage to the elements.
Innovation Solution
A method involving a light source element arrangement bar with laser diodes and photodiodes immersed in an insulation liquid with high transmissivity, where the elements are electrified using sheet probes, allowing for parallel processing and effective heat dissipation through stirring, maintaining a stable temperature and reducing evaluation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light source elements are tested simultaneously using existing burn-in test methods, then the evaluation time is reduced, but the heat dissipation becomes ineffective and the temperature stability deteriorates
Solution Approach 1:
The patent introduces an insulation liquid as an intermediary medium between the light source elements and the surrounding environment. This liquid serves dual functions: it provides effective heat dissipation through convection and conduction, while simultaneously maintaining electrical insulation to prevent short circuits during parallel testing of multiple elements
Solution Approach 2:
The patent applies hydraulic principles by using a liquid medium (insulation liquid) to achieve heat transfer and cooling. The liquid circulation system enables efficient thermal management during parallel burn-in testing, allowing multiple light source elements to be tested simultaneously while maintaining stable operating temperatures
2Productivity
If power supply probes are contacted to multiple laser diodes for parallel testing, then the productivity increases, but the device complexity and difficulty of operation increase
Solution Approach 1:
The patent merges multiple individual probe contacts into a single integrated probe structure. The power supply probe is designed with multiple contact points that can simultaneously contact multiple laser diode electrodes, transforming a complex multi-step connection process into a single operation that enables parallel testing of multiple elements
3Measurement precision
If the burn-in test is performed for a long duration to ensure accuracy, then the measurement precision improves, but the loss of time increases
Solution Approach 1:
The patent enables continuous parallel testing of multiple light source elements simultaneously immersed in the insulation liquid. By testing many elements at once rather than sequentially, the system achieves both high statistical accuracy for reliability assessment and reduced total testing time, as the useful action of measurement continues across all elements simultaneously
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 enables a rapid and accurate burn-in test for multiple light source units without damaging the elements, allowing for efficient sorting of defective and good parts while maintaining a stable temperature within normal load conditions.
Implementation Method 1
effective heat dissipation through stirring, maintaining a stable temperature
Implementation Method 2
effective heat dissipation through stirring
Implementation Method 3
electrifying the plurality of light source elements in a state where at least the plurality of light source elements and the plurality of light detectors are immersed in an insulation liquid
Implementation Method 4
a plurality of light detectors for monitoring a light output from a corresponding one of the plurality of light source elements
Data Source
AI summary
A method of the invention for performing burn-in test includes assembling, on a fixture stand, a plurality of light source elements and a plurality of light detectors for monitoring a light output from a corresponding one of the plurality of light source elements; and electrifying the plurality of light source elements in a state where at least the plurality of light source elements and the plurality of light detectors are immersed in an insulation liquid. Thereby, it is realized to hold a stable temperature in a short period of time, to maintain a temperature that does not deviate from normal load conditions, and to perform a sorting test between defect parts and good part for light source unit chips without causing damage to the elements.