Method of and cassette structure for burn-in and life testing of multiple LEDs and the like
First Claim
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1. A method of holding multiple LEDs for burn-in and optical and electrical life testing measurements, that comprises, providing a cassette with contacts rated for multiple insertions and adapted to receive a plurality of LEDs with leads thereof plugged therein;
- inserting said cassette holding the plurality of LEDs into a fixture board and electrically energizing the LEDs within the cassette to light all the LEDs simultaneously for burn-in;
following said burn-in, thereupon inserting the cassette holding the plurality of LEDs within a light-integrating sphere system and successively lighting each LED individually while conducting optical and electrical life-testing related measurements thereof within the sphere system, and wherein the forward voltage and leakage current is measured for each LED individually at each stage f the testing sequence.
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Abstract
A novel cassette structure technique for enabling simultaneous burn-in of pluralities of LEDs plugged into the cassettes, and then, with the cassettes mounted within a light integrating sphere system, separately measuring the spectral flux emitted by each successive individual LED plugged into the cassette to determine optical and electrical characteristics of each LED separately from the others.
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Citations
8 Claims
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1. A method of holding multiple LEDs for burn-in and optical and electrical life testing measurements, that comprises, providing a cassette with contacts rated for multiple insertions and adapted to receive a plurality of LEDs with leads thereof plugged therein;
- inserting said cassette holding the plurality of LEDs into a fixture board and electrically energizing the LEDs within the cassette to light all the LEDs simultaneously for burn-in;
following said burn-in, thereupon inserting the cassette holding the plurality of LEDs within a light-integrating sphere system and successively lighting each LED individually while conducting optical and electrical life-testing related measurements thereof within the sphere system, and wherein the forward voltage and leakage current is measured for each LED individually at each stage f the testing sequence. - View Dependent Claims (2, 3, 4)
- inserting said cassette holding the plurality of LEDs into a fixture board and electrically energizing the LEDs within the cassette to light all the LEDs simultaneously for burn-in;
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5. A cassette structure for holding multiple LEDs for burn-in and optical and electrical life testing measurements, having, in combination, a longitudinally extending cassette provided with a row of electrical contacts adapted to receive the leads of successive LEDs plugged therein;
- means for powering the cassette to light all the LEDs in the cassette simultaneously for burn-in;
means for subsequently mounting the cassette within a light integrating sphere system and for separately powering successive LED'"'"'s individually therein to enable the light integrating sphere system separately to measure the spectral flux emitted by each individually illuminated LED for determining one or more of radiant and photopic flux, spectrum and chromaticity, and wherein means is provided for enabling measuring forward voltage and leakage current for each LED individually at each stage of the testing sequence. - View Dependent Claims (6, 7, 8)
- means for powering the cassette to light all the LEDs in the cassette simultaneously for burn-in;
Specification