Old 11-09-2016, 11:58 AM #1
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Default What is the form factor of diodes found in DVD burners?

I'm planning to take apart a few old DVD burners, but I want to order some heatsinks first. That's kind of hard though because I don't know the form factor of the diode. (you know, TO-18, TO-5 etc )

Any idea what I have to expect?


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Old 11-09-2016, 03:53 PM #2
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Default Re: What is the form factor of diodes found in DVD burners?

Quote:
Originally Posted by NopIt View Post
I'm planning to take apart a few old DVD burners, but I want to order some heatsinks first. That's kind of hard though because I don't know the form factor of the diode. (you know, TO-18, TO-5 etc )

Any idea what I have to expect?

The ones you want are TO-18 (5.6mm), some DVD drives have weirdly packaged LDs though, which won't be much use.

This is the sort of "heatsink" you'll be looking for - not really a heatsink, but you can get heatsinks for those modules. The LD is press fit into the copper part, which also holds a focusing lens.



One of the many matching heatsinks:

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Last edited by diachi; 11-09-2016 at 03:56 PM.
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Old 11-09-2016, 11:35 PM #3
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Default Re: What is the form factor of diodes found in DVD burners?

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Originally Posted by diachi View Post
The ones you want are TO-18 (5.6mm), some DVD drives have weirdly packaged LDs though, which won't be much use.

This is the sort of "heatsink" you'll be looking for - not really a heatsink, but you can get heatsinks for those modules. The LD is press fit into the copper part, which also holds a focusing lens.



One of the many matching heatsinks:

wait what do you mean by weirdly packaged?
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Old 11-09-2016, 11:40 PM #4
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Default Re: What is the form factor of diodes found in DVD burners?

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Originally Posted by Merpie101 View Post
wait what do you mean by weirdly packaged?

Weird, non-standard. Like these:

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Old 11-10-2016, 02:12 AM #5
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Default Re: What is the form factor of diodes found in DVD burners?

They do occur, but most dvd writers have 5.6mm diodes in them, especially ones that are intended for use in a desktop pc (5.25" drives). You could find odd ones in things like slimline dvd writers intended for use in laptop computers and other cramped form factors.

In some cases the packages may not even be round, but odd rectangular things that would be difficult to mount in such a module. Condsidering the low price i'd ignore any of those.
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Old 11-17-2016, 11:09 AM #6
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Default Re: What is the form factor of diodes found in DVD burners?

Thanks for all the information.

I ordered some of these modules now.
Do you think I need an additional heat-sink for a DVD burner diode?
At how much mW could I safely drive them? And for how long at a time?
Do you think 15secs at 200mW would work without additional cooling?

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Old 11-17-2016, 03:35 PM #7
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Default Re: What is the form factor of diodes found in DVD burners?

Quote:
Originally Posted by NopIt View Post
Thanks for all the information.

I ordered some of these modules now.
Do you think I need an additional heat-sink for a DVD burner diode?
At how much mW could I safely drive them? And for how long at a time?
Do you think 15secs at 200mW would work without additional cooling?

What speed DVD drives did they come from?

It's really impossible to say accurately without knowing which diode you're using.
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Old 11-22-2016, 08:28 AM #8
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Default Re: What is the form factor of diodes found in DVD burners?

The max DVD burning speed is 24x I think.
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Old 11-22-2016, 10:01 AM #9
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Default Re: What is the form factor of diodes found in DVD burners?

It'll probably have a low ma red diode in there. Not really worth the time extracting for what it is. BUT... it's good practice if you plan on doing more extractions to get higher power diodes!
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Old 11-22-2016, 12:09 PM #10
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Default Re: What is the form factor of diodes found in DVD burners?

But 24x is the fastest burning speed for DVDs there is, isn't it?
I also have some burners that can burn with up to 16x...

How much mW would you say can I expect?
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Old 11-22-2016, 04:04 PM #11
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Default Re: What is the form factor of diodes found in DVD burners?

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Originally Posted by NopIt View Post
But 24x is the fastest burning speed for DVDs there is, isn't it?
I also have some burners that can burn with up to 16x...

How much mW would you say can I expect?

If that's the DVD burning speed then probably 200-350mW.


Really though, you'd be better just buying something like this: Mitsubishi LPC-826 660nm 300mW-400mW CW Red Laser Diode 1 pcs | eBay

Or this:

Mitsubishi LPC-826 660nm 300mW-400mW Red Laser Diode pressed into Laser Module | eBay
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Old 11-22-2016, 04:51 PM #12
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Default Re: What is the form factor of diodes found in DVD burners?

Yes these are the DVD burning speeds.
Thank you.

I know I can just buy the diodes for a few bucks, but I get these DVD burners for free.
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Old 11-22-2016, 05:03 PM #13
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Default Re: What is the form factor of diodes found in DVD burners?

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Originally Posted by NopIt View Post
Yes these are the DVD burning speeds.
Thank you.

I know I can just buy the diodes for a few bucks, but I get these DVD burners for free.

Fair enough , but still need to extract the LD, buy a module to put it in, a press fit tool to press fit the LD to the module and then deal with the tiny, short, pins of an extracted LD.
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Old 11-23-2016, 01:27 AM #14
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Default Re: What is the form factor of diodes found in DVD burners?

Quote:
Originally Posted by NopIt View Post
Yes these are the DVD burning speeds.
Thank you.

I know I can just buy the diodes for a few bucks, but I get these DVD burners for free.
Free is always good! That's why I said that they're good for practice, if you would rather extract your own diodes. Just remember that a lot of red spectrum diodes are open can, so there's that extra precaution that you have to take.
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Old 11-23-2016, 07:25 AM #15
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Default Re: What is the form factor of diodes found in DVD burners?

This "press fit tool" you mention, do I really need that? How can I find them and what do they even look like?
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Old 11-23-2016, 07:50 AM #16
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Default Re: What is the form factor of diodes found in DVD burners?

http://laserpointerforums.com/f39/di...ml#post1151767

He has several options depending on what size diodes you're using.

Last edited by Chrisbee; 11-23-2016 at 07:51 AM.
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