Electronics > Projects, Designs, and Technical Stuff
Very small and thin transparent enclosure
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jmaja:
Where can I find an enclosure for a prototype/small number product with the following specifications?
-Needs to be transparent or at least have windows for several LEDs and sensors (IR and visible).
-Needs to be very thin. The PCB+components will be 4 mm. Thickness is critical, thus hoping to find 6 mm etc. outside height.
-Size could be 30x40, 40x50, 30x80, 20x80 mm or something similar.

It would also help, if the case is water tight and can be opened for battery replacement.
ebastler:
Something like this, maybe?
https://ace-cases.com/product/compactflash-cf-case-for-single-cf-cardsmart-memory-media/

Similar cases for SD-Cards are also available, but may be too small.
None of them are water-tight, I'm afraid.
Ian.M:
Short of milling a case out of aluminum bar stock with a raised rim to protect the edges of a clear acrylic or polycarbonate sheet lid, with an O ring groove for a seal and a line of tapped holes outside the O ring groove to screw down the lid, I think that's going to be very difficult in small quantities.    Even so, 6mm thick is unrealistic - you might manage 7mm - as IMHO 1mm is too thin for a plastic lid that needs to be both removable and make a watertight seal, especially if its got to have countersunk screws through it.   
Nusa:
Clear shrink-wrap tubing. Cut long and seal ends with glue if you want water protection.

For battery replacement, cut it off and use a new piece of tube.
jmaja:
One thing I forgot to mention was that there must be a way to fix this enclosure to a surface. E.g. a two holes for webbing etc.

Could heat shrink tube really work for this? I could put the fixing wholes to the PCB. Or use the extra heat shrink tube for fixing. Would it seal well enough against the PCB or itself. I haven't used that big heat shrink tubes before.

Would the glue still be transparent?

Battery replacement is not a must and could be done with a heat shrink. The battery should last several years, which may be as long as the useful life anyway.

The product will not be submerged, but will be outdoors in a rain.

One idea I just got from polycarbonate. Maybe it could be feasible to to use 1 mm and 4 mm polycarboate? Cut a rim out of 4 mm and the glue or fuse the 1 mm top and bottom to it. https://www.cutplasticsheeting.co.uk/blog/uncategorized/how-to-glue-polycarbonate/

Can't be opened and closed, but would be rather strong and easy to mill.
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