Homebrew PCBs

>From: "Mike" <yahoo@...>
>Reply-To: Homebrew_PCBs@yahoogroups.com
>To: Homebrew_PCBs@yahoogroups.com
>Subject: [Homebrew_PCBs] Re: OHP Film & Laser Printers,  UV Laser Diode
>Date: Sun, 03 Oct 2004 00:41:20 -0000
>
>
>
>--- In Homebrew_PCBs@yahoogroups.com, "Thomas" <teecee@c...> wrote:
>
> > This UV Laser thing has me thinking (dangerous I know)  so slap me
>for bringing this up !! but during a few search's I come across some
>info that uses a UV Laser Diode in a DVD-R Burner & goes on about
>Photoresist being part of the Layer that records the Data, if its
>similar stuff or not i dont know. Maybe the UV Laser is to small and
>possible the focal point could be changed  to get a wider beam for
>Exposure, sounds easy enough but I bet it aint !!
>
>Possibly more useful than Lasers, Non-laser UV LEDs are available on
>Ebay etc for around 10-20c each. They seem to work fine directly off
>2x1.5v AA cells. The beam is divergent at an angle of approx 20
>degrees on the ones I have. I would imagine that it would be
>focussable with relatively inexpensive lenses too, or get a bunch of
>fibre optics and adapt an old dot matrix printer :o)


The wavelength needs checking, to make sure it is correct. The power also 
needs to be checked, I don't think that UV LEDs will have enough power.

Leon

I did some thinking about this as well.  I found on this list that
some pre-sensitised PCB are sensitive in the range of 340 to 400 nm,
and peak at about 360nm.  The LED that I bought has an output at
405nm.  As far as power, just move slower!  A co-worker's friend, who
works with optics as a consultant, said it wouldn't be hard to pick
some lenses and fiber from Edmund scientific to foccus most of the
LED's light into the fiber.  And if I were more serious I might be
able to get him to help me design something, but due to too many
projects, trying this will most likely just be a through experimnet
for me...

- Steven Ciciora

--- In Homebrew_PCBs@yahoogroups.com, "Leon Heller" <leon_heller@h...>
wrote:
> 
> >From: "Mike" <yahoo@d...>
> >Reply-To: Homebrew_PCBs@yahoogroups.com
> >To: Homebrew_PCBs@yahoogroups.com
> >Subject: [Homebrew_PCBs] Re: OHP Film & Laser Printers,  UV Laser Diode
> >Date: Sun, 03 Oct 2004 00:41:20 -0000
> >
> >
> >
> >--- In Homebrew_PCBs@yahoogroups.com, "Thomas" <teecee@c...> wrote:
> >
> > > This UV Laser thing has me thinking (dangerous I know)  so slap me
> >for bringing this up !! but during a few search's I come across some
> >info that uses a UV Laser Diode in a DVD-R Burner & goes on about
> >Photoresist being part of the Layer that records the Data, if its
> >similar stuff or not i dont know. Maybe the UV Laser is to small and
> >possible the focal point could be changed  to get a wider beam for
> >Exposure, sounds easy enough but I bet it aint !!
> >
> >Possibly more useful than Lasers, Non-laser UV LEDs are available on
> >Ebay etc for around 10-20c each. They seem to work fine directly off
> >2x1.5v AA cells. The beam is divergent at an angle of approx 20
> >degrees on the ones I have. I would imagine that it would be
> >focussable with relatively inexpensive lenses too, or get a bunch of
> >fibre optics and adapt an old dot matrix printer :o)
> 
> 
> The wavelength needs checking, to make sure it is correct. The power
also 

> needs to be checked, I don't think that UV LEDs will have enough power.
> 
> Leon

Steven, why not use a powerful enough UV Bulb, some lenses and an Optical 
Fibre?
Cristian

>I did some thinking about this as well.  I found on this list that
>some pre-sensitised PCB are sensitive in the range of 340 to 400 nm,
>and peak at about 360nm.  The LED that I bought has an output at
>405nm.  As far as power, just move slower!  A co-worker's friend, who
>works with optics as a consultant, said it wouldn't be hard to pick
>some lenses and fiber from Edmund scientific to foccus most of the
>LED's light into the fiber.
>
>- Steven Ciciora


  ----------


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.733 / Virus Database: 487 - Release Date: 02/08/04


[Non-text portions of this message have been removed]

On Tue, 05 Oct 2004 17:10:38 +0200, Cristian <bip@...> wrote:

>
> Steven, why not use a powerful enough UV Bulb, some lenses and an Optical
> Fibre?
> Cristian

would the fiber pass UV (it is VVVERRRRRYYY thick after all).
I mean there must be a reason they use quartz glass, are fibers quartz  
glass?

ST

Cristian wrote:
> Steven, why not use a powerful enough UV Bulb, some lenses and an Optical 
> Fibre?
> Cristian

I just made a lightbox that uses a 125W mercury vapour HID bulb (was 
thinking of using a 400W bulb for a while;)

>>I did some thinking about this as well.  I found on this list that
>>some pre-sensitised PCB are sensitive in the range of 340 to 400 nm,
>>and peak at about 360nm.  The LED that I bought has an output at
>>405nm.  As far as power, just move slower!  A co-worker's friend, who
>>works with optics as a consultant, said it wouldn't be hard to pick
>>some lenses and fiber from Edmund scientific to foccus most of the
>>LED's light into the fiber.
>>
>>- Steven Ciciora
>

My idea was to use it on a UV sensitives with a plotter, without a film or 
transparency.
Not to expose UV sensitive boards through a film as usually.
A thin ( some 5 to 10 mil ) UV ray.
Cristian

>Cristian wrote:
> > Steven, why not use a powerful enough UV Bulb, some lenses and an Optical
> > Fibre?
>
>I just made a lightbox that uses a 125W mercury vapour HID bulb (was
>thinking of using a 400W bulb for a while;)



  ----------


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.733 / Virus Database: 487 - Release Date: 02/08/04


[Non-text portions of this message have been removed]

There are UV optical fibres used by dentists to fix tooths.
The small patches  are hardened by UV using a flexible fibre from the UV 
box to mouth.
Cristian

>would the fiber pass UV (it is VVVERRRRRYYY thick after all).
>I mean there must be a reason they use quartz glass, are fibers quartz
>glass?
>
>ST


  ----------


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.733 / Virus Database: 487 - Release Date: 02/08/04


[Non-text portions of this message have been removed]