Laser application

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27 Apr 2012 11:35 #19580 by andypugh
Replied by andypugh on topic Re:Laser application
Zig wrote:

and You thought you didnt need yet another project)

If, for the sake of argument, I had already made a start on this, what would be a typical image resolution in pixels?
is there any requirement for greyscale?
This has a bearing on how the userspace and realtime components communicate laser intensity data.

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28 Apr 2012 02:48 #19601 by Zig
Replied by Zig on topic Re:Laser application
Andy,

My starting point is a Gerber layer file. I use the laser to do direct imaging of solder mask and overlay component.

The process is driven not by grey scale but by light sensitivity of the epoxy compounds.IN the above explanations I use the encoder output to flash the dot of a fixed duration in order to deliver sufficient energy to the epoxy layer to expose it. So for each encoder count there is a fixed amount of energy delivered. As the axis speed varies the flash rate varies.
Visually it appears that the laser is intensity modulated but in fact the energy per unit area is constant.

I am trying to make PCBs for living , specialising in quick turn and one off manufacturing in the hope of competing with imported product.

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28 Apr 2012 14:40 #19612 by andypugh
Replied by andypugh on topic Re:Laser application
Zig wrote:

The process is driven not by grey scale but by light sensitivity of the epoxy compounds.IN the above explanations I use the encoder output to flash the dot of a fixed duration in order to deliver sufficient energy to the epoxy layer to expose it. So for each encoder count there is a fixed amount of energy .


I guess that a constant-speed scan would allow you to do all that simply by altering the speed?

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29 Apr 2012 21:48 #19629 by Zig
Replied by Zig on topic Re:Laser application
By locking the laser to the movement of the X and Y axes speed becomes immaterial as long as the laser capability ( to deliver energy) is taken into consideration in formulating the process

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