Hi Everyone ,
I want to make UV exposure machine for PCB manufacturing. I want to know the important things to be consider while making such a machine.
This machine will be for prototyping PCBs only.
Please contribute your thoughts.
Thanks in advance..
:idea:
Thanks Rob for your help.
I saw some UV exposure machines. It includes exhaust Fans for heat transfer, generated by UV lamps.
I also want to know the pricing for UV lamps.
That's a typical DIY solution. Professional exposure machines are rather using high pressure discharge lamps because
of better edge reproduction, also vacuum pressing fixture.
Thanks everyone for the contribution.
Electronicus, I read the artical and it is very useful. I am going to implement these things.
Rajudp, are you from India? I am from India. I want to know, from where I can get all these parts for exposure machines. Right now I am searching these in my local market.
If anyone is having anymore information, please contribute your knowladge.
Thanks again everyone.
I am from India and i brought the tube from polymer stamp making dealer, you can get it in electrical shops, I tried first with 40w choke but I was not able to find the starter for that (not working) so now I am using it with 4 20w choke, what type of copper clad you are using ie photo resist or pre-coated one
To expose the cromalin film, You'll have to confirm that the UV light is uniformly spead all over the exposing glass where the film will be placed. Nearer the distance, faster will be the exposing time. But also take precautions not to over expose the same. A distance of 1 to 2 feet will optimally work fine for tube lughts. In case of LED, it all depends on its angle of the beam.
Cheers
Thanks pranam77,
Right now I am using UV black light for it. For this I am thinking to keep the distance about 4 inches. So can you tell me will it be ok or it will over expose the film.
Thanks pranam77,
Right now I am using UV black light for it. For this I am thinking to keep the distance about 4 inches. So can you tell me will it be ok or it will over expose the film.
The exposure time can be basically adapted to any light source distance and intensity. Because low pressure lamps have a
low intensity, you may want to reduce the distance to get acceptable exposure time. But the requirement of uniform intensity
contradicts a too small distance.
As mentioned previously, large area sources have the disadvantage of giving less resolution compared to a "point" source, e.g.
a high-pressure arc discharge lamp.