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Green Laser Pointer Dismantle (N****** type)
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spark001uk
25mW Classic Wicked Laser
Joined: 28 Dec 2005
Posts: 29
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 Posted: 6/11/08, 7:21 PM Post subject: Green Lase |
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Reading all the controversy about these pointers, (most people call them N****** lasers, after a brand that makes this style of pointer in China) i thought i would take one completely apart, to see exactly what's what. I was helped a little by one of the batch i bought not being fixed together at the front properly, so the assembly just slid apart!
Here's one of them in its case.
Purchased these on 4/6/08 from Hong Kong (where else!!!).
Basically the parts are all threaded, and the various parts look like this, from left to right: End cap, Collimator, Crystal set, and bare IR diode/driver board.
Top side of driver board.
..and the other side. Note the position for the pot (marked RE1) is bridged with a resistor instead.
View of the bare IR diode, surprised to see its not cased!
View of the back of the crystal set.
I wouldn't recommend dismantling this far unless you have to, it was a right pain to get that lot realigned!! The use of hot melt by the factory helped, all i had to do was re-melt it to glue the crystal housing back in place (this has to be spot on rotationally, you're firing the diode into a crystal with about a 1.5mm end, and it's offset!).
As the complete assembly pulled apart easily, i'm guessing whatever held it in wasn't there on this one, whether it was a shim or not i don't know. Bit of glue on one side maybe, not all the way round though as electrical contact is relied upon to carry the +ve current to the diode case (which i always thought was the cathode, or at least it was on the dvd diode i played around with. So don't quite know how they get round that!).
Anyway, one thing i noticed straight away- where's the IR filter? All i saw from the diode to the outside world was crystals, mirror/lens, and collimator. No IR filter as far as i can see!
One important thing i must stress is, be careful of the -ve battery spring, make sure the piece of foam isn't too low down, a friend of mine screwed it together and the spring must have leant sideways and bridged the neg straight to the case. Dead short across batteries = lots and lots of heat!!
Also i didn't see anything supporting the driver board to stop it bending when pressing the button, so i stuck a piece of foam down between the back of the driver board and the case to support it.
Hope this helps answer a few questions!
Last edited by spark001uk on 6/12/08, 5:22 PM; edited 1 time in total |
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spark001uk
25mW Classic Wicked Laser
Joined: 28 Dec 2005
Posts: 29
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| Posted: 6/12/08, 12:19 PM Post subject: |
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Following up on this, i have actually now dismantled my old one for a project i'm doing, and it appears this is an original, making the above pointer a copy possibly?
Here you can see this one looks a bit better made, the sections butting up nicely to each other. This one has the pot fitted too.
On the other side we see the two wires going into the optics, i'm assuming this connects to a photodiode and angled IR filter setup, i haven't actually dismantled that part, not wanting to upset alignments.
Also on the rear face of the brass collar around the diode is engraved the word N******, and also their web address, so i imagine this is a genuine one. |
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Bluefan
Fusion Laser
Joined: 20 Apr 2008
Posts: 299
Movie(s): 1
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| Posted: 6/12/08, 12:24 PM Post subject: |
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I have a pointer jsut like the one in your first post, and I'm about to dismantle it too, how did you did yours?
Anyway, GREAT pictures! |
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spark001uk
25mW Classic Wicked Laser
Joined: 28 Dec 2005
Posts: 29
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| Posted: 6/12/08, 1:36 PM Post subject: |
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| Ok, well, first we need to have a guess which it is, as they're both almost identical outside! Does it have anything engraved on the silver pocket clip? |
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Bluefan
Fusion Laser
Joined: 20 Apr 2008
Posts: 299
Movie(s): 1
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| Posted: 6/12/08, 3:02 PM Post subject: |
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| spark001uk wrote: |
| Ok, well, first we need to have a guess which it is, as they're both almost identical outside! Does it have anything engraved on the silver pocket clip? |
No, no engravings.
The driver board seems identical (viewed from the batterycompartiment) to the one in your first post. I bought it a few month ago.
Does anyone know the power of the pump diode? My pointer is broken anyway as the diode probably got misaligned, and I'm considering buying a more powerfull pump diode, the crystals are probably the same as in a bit higher powered version. |
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spark001uk
25mW Classic Wicked Laser
Joined: 28 Dec 2005
Posts: 29
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| Posted: 6/12/08, 5:14 PM Post subject: |
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| Well i wonder if the same diode is used for all the range up to 100mw or so, and they just underpower it for the lower ones? It'd make sense, it'd be cheaper for them not to have to get all different diodes etc etc, they could all get manufactured at once and just tweaked accordingly at the testing stage! |
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