Very nice. A few questions
1. What are you using for the mask
2. Can you upload the datasheet for the LED's you are using.
3. Can you post parts lists and schematics for the driver board.
4. Do you have any pictures of boards you have done with it.
Again very nice. Congratulations.
--- In
Homebrew_PCBs@yahoogroups.com, Markus Zingg <homebrew-pcb@...>
wrote:
>
> Hi group
>
> Last summer I created a UV LED based exposure unit with which I had
IMHO
> very good results. I uploaded a description and pictures to the
> following place in the files section:
>
> Files </group/Homebrew_PCBs/files/> > Homemade_PCB_equipment
> </group/Homebrew_PCBs/files/Homemade_PCB_equipment/> > UV LED
exposure unit
>
> Below you find the descriptive text for your quick reference - enjoy!
>
> Markus
>
> <------- cut here --------->
>
> UV LED exposer unit
> -------------------
>
> In this folder you can see pics of my homebrew, UV LED based double
side exposure unit. The folowing features are maybe "special" enough
to be noted:
>
> - It generates very PARALELL light. This is important if you want to
make small traces. Using this unit, I already sucessfully created
boards with 5 mil traces using dry film fotoresist.
>
> - There are two holes in each glass allowing the positioning shafts
I use to allign the films against the PCB to remain. This allows me to
leave the protection foil on the dryfilm resist, resulting in almost
no wear out on the films.
>
> - Obviousely this unit allows to expose both sides of a PCB at the
same time. To do this, the upper box is simply placed on top of the
lower. The glass is intentionally NOT mounted to the boxes. This
allows me to fimrly press the two glasses together thereby makeing
sure there are no air bubbles.
>
> - The LED distance is 20mm square, distance from the LEDs to the PCB
is ~65mm
>
> The exposure time is longer than what's normal with tube oriented
units. I'm almost exclusively working with dryfilm resist due to it's
several advantages. There the time is exactly one minute.
>
> Feel free to ask questions, otherwiese enjoy :-)
>
> Markus
>