[Libre-silicon-devel] Maskless lithography

[David Lanzendörfer]

Awesome Dilek!
I'm looking forward to discussing it!

David

On Monday, August 2, 2021 4:58:32 AM WEST Dilek Isik Akcakaya wrote:
> Looks good David,
> 
> I started to create a road map to be discussed.
> 
> Dilek
> 
> -------- Original Message --------
> 
> On Aug 1, 2021, 7:57 PM, David Lanzendörfer wrote:
> > Hi all
> > I just woke up from bed again with the idea to use use laser triangulation
> > for the distance measurement, since there's an inexpensive solution
> > already for Arduino:
> > https://rohling-de.blogspot.com/2017/04/shooting-laser-to-measure-distance
> > .html https://www.st.com/resource/en/datasheet/vl6180x.pdf
> > The internal ADC has a resolution of 16 bits, which should be sufficient
> > to
> > resolve the small distance a table for a 2 inch wafer has to travel.
> > 
> > Cheers
> > David
> > 
> > On Sunday, August 1, 2021 2:46:34 PM WEST David Lanzendörfer wrote:
> >> Howdy
> >> So I came across those two components which can solve our positioning
> >> problem with the wafer:
> >> 
> >> Those LEDs produce a light within the spectrum we need in order to shine
> >> through silicon (1000nm ~ 1400nm):
> >> https://tech-led.com/en/product/ir-nir-leds/
> >> 
> >> The OV5647 is sensible up to at least 1000 nm and is quite affordable:
> >> https://cdn.sparkfun.com/datasheets/Dev/RaspberryPi/ov5647_full.pdf
> >> 
> >> There are OV5647 imaging modules available for Raspberry Pi.
> >> I'll try to contact Marubemi directly and ask them for a quotation on
> >> their
> >> NIR/IR LEDs in the wavelength range we require and while I'm on it, I'll
> >> also check with them for a potentially more suitable CMOS sensor, then
> >> I'll
> >> compare the prices.
> >> As I've discussed with Dilek, the goal is to produce an affordable
> >> stepper
> >> suitable for hobbyists and small labs with limited budget.
> >> 
> >> Cheers
> >> David
> > 
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