I've ID'ed the 2d barcode type used on the BDR-205 diode. It's Datamatrix (ECC200), format 1 (12 x 12).
This should actually be easier to read than the micro QR codes, since more readers support it. Again, it looks highly likely that it is a 10 numeric digit code, with heaps of error correction. These look a lot like batch numbers, though the different barcode styles suggest different manufacturers...
The marking style looks like laser marking, which has a kind of symmetry to it, since the mark is being lasered onto a laser
BTW.. Anything with features bigger than about 800 nanometres (0.8 micron), I can image at very high resolution Might be interesting to look at a laser diode chip after it has died from overpower to analyze the failure mode...
I am considering depackaging my dead Nichia diode and photomicrographing the diode die itself in the hope of finding a manufacturer's marking of some kind.
Any thoughts on all of this?
Pete.
This should actually be easier to read than the micro QR codes, since more readers support it. Again, it looks highly likely that it is a 10 numeric digit code, with heaps of error correction. These look a lot like batch numbers, though the different barcode styles suggest different manufacturers...
The marking style looks like laser marking, which has a kind of symmetry to it, since the mark is being lasered onto a laser
BTW.. Anything with features bigger than about 800 nanometres (0.8 micron), I can image at very high resolution Might be interesting to look at a laser diode chip after it has died from overpower to analyze the failure mode...
I am considering depackaging my dead Nichia diode and photomicrographing the diode die itself in the hope of finding a manufacturer's marking of some kind.
Any thoughts on all of this?
Pete.
Last edited: