Homebrew PCBs

Good idea. How to make reliable electrical power  and video connection to the laser?

--- On Fri, 11/13/09, Adam Seychell <a_seychell@....au> wrote:

From: Adam Seychell <a_seychell@...>
Subject: Re: [Homebrew_PCBs] Making PCB using these new 405nm LASER Diodes
To: Homebrew_PCBs@yahoogroups.com
Date: Friday, November 13, 2009, 12:47 PM







 



  


    
      
      
      Volkan Sahin wrote:

>  



> I added laser to the side of inkjet head and I'm using raster scanning 

> method to expose photoresist.

> I've the same idea to use polygon mirrors of a old laser printer. I've 

> one Brother printer which has an aluminum mirror (most of them have a 

> copper or gold plated mirror on  aluminum because of IR laser) and 

> plastic lenses it seems it is possible to use with blue laser. I did 

> some rough measurements and I saw that on optical path I'm loosing ~30% 

> of the power most of it is because of diagonal mirrors because of that I 

> left it for a future project.   

> 



The polygon mirror concept sounds more difficult to implement.

How about a large diameter disc with a laser diode mounted on the 

perimeter. The PCB moves linear to the disc. Software would compensate 

for uniform exposure energy.



Assume that:



Resolution	= 0.005cm (50um)

Disc diameter 	= 15cm

Energy 		= 60mj/cm^2

Laser power 	= 85mW



Then



maximum disc RPM

	= 60 * 1cm/0.005cm / (60/85 * 15*1)

	= 1133



1000 RPM sounds reasonable.





    
     

    
    


 



  






      

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