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4hv.org :: Forums :: Projects
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Laser etching/PCB maker jig Mark 2

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uzzors2k
Wed May 04 2011, 04:28PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
hboy007 wrote ...

Conundrum wrote ...
Needless to say the first thing I did is locate the datasheet, and found the chip is stll current, see Link2 for someone else using one.

oh look, it's me in the comments section. Maybe I'll give my scanner unit another try.

James, pardon me for not making this clear. Conundrum and I are just planning to shine some nice light on the photoresist.

Sorry for the OT, but did you guys notice some of the videos that guy favorited? I didn't dare look at any, the titles alone were enough. ill
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Conundrum
Wed May 04 2011, 04:36PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
 		hm.

I am being sent some failed 445nm diodes which if the broken bond wires are patched up will be used for this project.

Seems that some of the time when they blow the diode survives but the bond wires on one or both sides open due to the sharp bends.

This particular repair technique was pioneered by someone on LPF and I am hoping to improve on this with the use of a custom jig and
3-D video setup based on webcams with scanner lenses.

EDIT:- Two COD'd 405's not 445's.
Oh well, I got one working at 5% of rated power so not completely useless.

EDIT:- picture of current 405nm scanner..
Link2

I also found that this particular scanner has a small lens for detecting the beam power, this can be repurposed as a start sensor.


-A
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hboy007
Wed May 04 2011, 05:33PM
hboy007 Registered Member #1667 Joined: Sat Aug 30 2008, 09:57PM
Location:
Posts: 374
 		I recall common photoresist materials have their peak sensitivity in the near UV up to 400nm which greatly deminishes towards 450nm.

Novolak sensitivity: Link2 it seems that the sensitivity at 400nm is better than at 450nm by a factor of 3.
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James
Wed May 04 2011, 06:23PM
James Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
 		405nm diodes are dirt cheap, you might get better results with one of those, and not nearly as much power is needed.
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Conundrum
Mon May 30 2011, 06:33PM
Conundrum Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
 		So far so good.

I've dismantled the polygon assembly and attached wires, it spins nicely and completely stable for a change.
This particular module has a sense output pair which is a track on the PCB, and an enable line.
The chip can have its speed adjusted by varying the bias to one of its pins, but I doubt I will need to do this as long as my RAM chips can keep up smile

Confirmed that the losses are 91.7% due to the AR coating on this mirror, but this is substantially better than the plastic optics before so it is still doable.
I have a spare uncoated polygon mirror which is intact.

Anyone know how to nuke infrared AR coatings on aluminium mirrors? smile

-A
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Shrad
Mon May 30 2011, 09:27PM
Shrad Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
 		I repaired laser diodes by resoldering bonding wires way before 445nm diodes were here...

the best repair was an opnext 150mW 642nm diode at 120€... I was pretty happy it worked

there's no need of special camera setup etc... a simple binocular is way enough
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Nah
Tue May 31 2011, 12:04AM
Nah Registered Member #3567 Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
 		Why do something pratical and boring like use a pen when you can use a quote on quote "lazer"...

(It's a Dr. Evil thing....)
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