April 2021 - Libresilicon-developers

Stepper
by David Lanzendörfer 10 Apr '21

10 Apr '21

Hi So for detecting the aligner markers I'll probably use the MLX90640ESF- BAA-000-SP[1] for detecting the alignment marker by shining through the waver with an IR LED. This resist[2] here can be exposed with a UV LED[3] up to 450nm wavelength, which is well within the tolerance range of the DLP2000[4] (on page 8). I'm right now working out the radial alignment and the loading mechanism, which is actually much harder than originally envisioned, because I kind of need a suction mechanism because I don't wanna scratch the surface or expose the wafer to too much mechanical stress. Cheers -lev [1] https://eu.mouser.com/ProductDetail/Melexis/MLX90640ESF-BAA-000-SP/? qs=y6ZabgHbY%252Bz1Luyoz5kAtA== [2] https://www.microresist.de/en/produkt/ma-p-1200g-series/ [3] https://protosupplies.com/product/led-3w-deep-blue-440-445nm-10-pack/ [4] https://www.ti.com/lit/ds/symlink/dlp2000.pdf

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Lifespan & UV
by David Lanzendörfer 10 Apr '21

10 Apr '21

Hi So in the data sheet of the DLP2000 they say that UV light will reduce the life span of the DMD chip. However. Sam Zeloof is using a DMD display from an overhead projector and it seems to be working ok. Should I take the chance and take this 30 Euro chips from Mouser, although the data sheet says, UV wouldn't be advised? I mean, I still can replace the chip afterwards through a more expensive UV chip, when the rest of the machine works... Cheers -lev

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GloveBox
by David Lanzendörfer 10 Apr '21

10 Apr '21

Hi Attached you can find a screen capture of what I've got so far for the 3D design for the glove box. On the right I'm going to make some cut out and will have a small double door box, as an air lock. Cheers -lev

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Announcement - Mumble session on Sunday 2021-04-11 @ 18:00 UTC
by Hagen SANKOWSKI 10 Apr '21

10 Apr '21

Hello List! This is our weekly announcement for the next Mumble Sessions on Sunday 2021-04-11 @ 18:00 UTC. Please join us as usual at our Mumble Server murmur.libresilicon.com at Port 64738, the Channel is IC. We like to follow-up our meeting minutes from mumble sessions before. Regards, Hagen.

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Re: [Libre-silicon-devel] Lifespan & UV -> Go green
by ludwig jaffe 08 Apr '21

08 Apr '21

Hi all, today I talked to a co-worker of mine Shakor who designs optical stuff, and he explained to me, that using UV is a very bad idea, as it destroys everything, also lenses! "Our chips are the biggest". Go for bigger structures for the start, so use green light for example. Here one could also experiment with lens assemblies made for professional cameras like old M42 lenses made by Leiz, and Zeiss Jena. Also the DLP chip is not nice for our application as we do not need a 3 color LED drive embedded in the chip as we have only one wave length and so we dont do RGB and we dont need a sync between LED and DLP. So go for higher resolution "monochrome" just the mirrors, e.g. 2K Very important is to get a uniform intensity, which requires a special lens assembly as one needs to transform the gaussian-curve intensity diagram of any LED into a square diagram as this square intensity is projected to the mirror assembly and then on the chip. I am sure, that we can get professional help with the optics stuff, as long it is visible light. Regards, Ludwig On 4/8/21, David Lanzendörfer <leviathan(a)libresilicon.com> wrote: > Hi > So in the data sheet of the DLP2000 they say that UV light will reduce the > life span of the DMD chip. > However. Sam Zeloof is using a DMD display from an overhead projector > and it seems to be working ok. > Should I take the chance and take this 30 Euro chips from Mouser, although > the data sheet says, UV wouldn't be advised? > I mean, I still can replace the chip afterwards through a more expensive > UV chip, when the rest of the machine works... > > Cheers > -lev > > _______________________________________________ > Libresilicon-developers mailing list > Libresilicon-developers(a)list.libresilicon.com > https://list.libresilicon.com/mailman/listinfo/libresilicon-developers >

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Stepper, DMD chip
by David Lanzendörfer 07 Apr '21

07 Apr '21

Hi What do you think about using the DLP2000 for the first version of my exposure unit? It could already make structures down to 50um with a die size of 1cm x 1cm Cheers -lev

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Maskless Lithography
by David Lanzendörfer 05 Apr '21

05 Apr '21

Hi So Mouser has DMD chips from Texas Instruments, with multiple of those chips you already can achieve around 20 micron feature sizes and lower on a 1cm x 1cm die... For 50 Euros a chip... NOT 4000 Euros... I think it's a no brainer to run with DMD chips for now... Cheers -lev

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GloveBox
by David Lanzendörfer 05 Apr '21

05 Apr '21

Hi So I'm right now tinkering together the GloveBox in FreeCAD. Attached is a little preview. Material wise we're much cheaper than the alternatives found on global supply[1], since I'm using standard aluminum profiles, acrylic glas and other off the shelf materials like perforated aluminum sheets[2], and for the air filtration I will use an inexpensive pump with HEPA filter from eBay[3]. Cheers -lev [1] https://www.globallabsupply.com/Two-Port-Simple-Closed-Loop-Glovebox-Acrlic… [2] https://hardware-warehouse.co.uk/Round-Perforated-Anodised-Aluminium-Sheet-… [3] https://www.ebay.com/p/19020368277?iid=373004598128

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Should I join the mumble session this weekend?
by Pavel Nikulin 04 Apr '21

04 Apr '21

Hello list, I finally got a first human response from JBD about the matrix. I informed David, and am awaiting his reply. I'd like to speak about about approaching them, and a bit on your funding. I believe you already scoured through all, and everything with regard to funding opportunities, but I believe the big news of the last few months open a few more avenues for you. I believe having to chase funds again will be a big distraction for you, as expected, but the cost benefit on that, and any chance on commercialization fade if not pursued withing months.

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Announcement - Mumble session on Sunday 2021-03-21 @ 18:00 UTC
by Hagen SANKOWSKI 02 Apr '21

02 Apr '21

Hello List! This is our weekly announcement for the next Mumble Sessions on Sunday 2021-03-21 @ 18:00 UTC. Please join us as usual at our Mumble Server murmur.libresilicon.com at Port 64738, the Channel is IC. We like to follow-up our meeting minutes from mumble sessions before. Regards, Hagen.

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