Homebrew PCBs

The film would be like regular camera film, sensitive to visible light.  It won’t be photoresist.

 

It’s for doing PCBs (or whatever) with photoresist; film over PCB, expose, etch.

 

Years ago I used to make film masters of bar codes for the printing industry the same way, a PC controlled a little XY plotter that used a red laser to ‘draw’ on film.

 

Tony

 

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Sunday, 21 December 2014 4:17 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: RE: [Homebrew_PCBs] Re: laser ablation of paint on copper clad

 






The Bungard photoplotter uses a red 670nm laser diode.  The spot size is 0.005mm/0.0002inches which produces 5,000 dpi resolution.  How is a 0.005mm spot size achieved with a laser diode?

http://bungard.de/index.php?option=com_content&view=article&id=43&Itemid=60&lang=english

Jeff

 

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Saturday, December 20, 2014 5:02 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: RE: [Homebrew_PCBs] Re: laser ablation of paint on copper clad

 

  

They’re YAG lasers, so yeah $$$$$ is right.

Spot size starts with wavelength, smaller wavelength = small spot, so UV < Visible < IR.

A YAG will be 1/10th the size of the typical IR CO2 lasers simply due to frequency of the light.

A lens with a short focus is next, a problem there is scanning and short focus don’t get along well.

“How big is the spot” varies depends on a lot of variables, including defining just what the spot itself actually is (scatter etc).

Save your pennies and get one of these: http://www.youtube.com/watch?v=mzmjGz0_joM. My reaction to seeing that was “That’s awesome!” – most lasers can’t etch copper, indeed some systems use copper mirrors for that reason.

Tony

From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com] 
Sent: Saturday, 20 December 2014 5:40 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Re: laser ablation of paint on copper clad

HI, jeff

On this page : http://www.beamtech-laser.com/en/proInfo.aspx?m=20101216100729203892 <http://www.beamtech-laser.com/en/proInfo.aspx?m=20101216100729203892&n=20101222115304745038&protype=20101216101714765927> &n=20101222115304745038&protype=20101216101714765927

they speak of that kind of laser spot resolution.

But only by the looks of it I think its going to be a $$$$$$ digit number ...LOL

camillus

On 12/19/2014 10:43:29 AM, jeff.heiss@... [Homebrew_PCBs] <homebrew_pcbs@yahoogroups.com> wrote:

The Bungard drum plotter has laser spot size of 0.005mm/0.0002inches. This is a resolution of 5,000 dpi. The laser inside is a red 670nm laser. How do they achieve this? What laser and lenses are used?

Is red sensitized photoresist film common? Where can it be purchased?

Photoplotter <http://bungard.de/index.php?option=com_content <http://bungard.de/index.php?option=com_content&view=article&id=43&Itemid=60&lang=english> &view=article&id=43&Itemid=60&lang=english> 



<http://bungard.de/index.php?option=com_content <http://bungard.de/index.php?option=com_content&view=article&id=43&Itemid=60&lang=english> &view=article&id=43&Itemid=60&lang=english> Image removed by sender. image

<http://bungard.de/index.php?option=com_content <http://bungard.de/index.php?option=com_content&view=article&id=43&Itemid=60&lang=english> &view=article&id=43&Itemid=60&lang=english> Photoplotter 

Filmstar-Plus is the name of the next generation of our bitmap photoplotter series. Optimized for inhouse production of high end film layouts at reasonable p...



<http://bungard.de/index.php?option=com_content <http://bungard.de/index.php?option=com_content&view=article&id=43&Itemid=60&lang=english> &view=article&id=43&Itemid=60&lang=english> View on bungard.de 

Preview by Yahoo 




Jeff

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