Old 11-25-2013, 06:11 PM #1
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Question laser LINE GENERATOR, please suggest how to make/get one?

Hi guys,
I need to mass produce a reasonably cheap device ( already over 1000 customers ), which would shoot a vertical laser line, thinner then 0.5mm at a distance of 110mm to 190mm , with a fan angle of about 110 degrees.

The first thing I tried was a simple 2$, fixed focus laser line module from ebay, but it did have a line about 2.5mm wide.

Next I got an adjustable laser line module, 3~5$ , but it did have a very bad focus depth and needed to be adjusted all time, which isn't good. customers want to just turn on the device and get a line, without adjusting it.

Next I ordered a custom made line laser from china, which they offered at 10$/piece if I would order 1000 units. But it's line quality was also pretty poor.



So I came up with an idea to get a laser and a "line generator" separately. Benefit would be obvious - I could order a "line generator lens" with a cut, so that it would mount into my device and always generate a vertical line.

What I wanted to ask - do I understand correctly that the distance from the laser to the "line generator" is not critical for line width, like +/- a few mm won't change anything? And the line width depends on the width of the laser dot, that hits the generator? Therefor I have to get a dot module, that produces the dot <0.5mm in diameter at a needed distance, pop a generator somewhere in front of it and I will get a nice, thin line, right?

Thanks!


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Old 11-25-2013, 07:50 PM #2
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Default Re: laser LINE GENERATOR, please suggest how to make/get one?

How about getting the dot as small as possible first with optics (aspherical lens or plano convex lens which also seems to be a great way to reduce spherical aberration - ref. in link below), and then passing that thru a collimator and then to the cylinder (line) lens?

Should give you a thinner line, no? Would be curious to see the result if you try it.

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Old 11-25-2013, 08:05 PM #3
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Default Re: laser LINE GENERATOR, please suggest how to make/get one?

Sounds interesting, but I don't want to make it over complicated, since it will be a mass produced product. So I guess the best solution would be to find a laser module with all that stuff already inside and then just passing it through the line lens.

Maybe you could suggest some cheap module suppliers?

Thanks

Last edited by Artem; 11-25-2013 at 08:06 PM.
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Old 11-25-2013, 08:08 PM #4
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Default Re: laser LINE GENERATOR, please suggest how to make/get one?

I don't know of any, sorry. Maybe other members will be able to help.
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Old 11-25-2013, 08:43 PM #5
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Default Re: laser LINE GENERATOR, please suggest how to make/get one?

Ok, but just wanted to ask again to be sure I understand correctly - distance from the laser module to the line lens is not critical for the line width?
Considering that the lens is placed a few mm from the laser and we want to get the line at a distance of about 150mm.

THnaks
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Old 11-25-2013, 08:45 PM #6
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Default Re: laser LINE GENERATOR, please suggest how to make/get one?

Please don't post the same question in two separate threads. There's no reason to start a second thread, anyone who can help you will see the first one no problem.

Good luck though.
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