I made a quick video explaining the new LCD Cables, as the dummy has arrived:
Thank you for the video! The solid copper dummy cable looks like it fits well. Do you have an estimates around when will you be receiving production samples?I made a quick video explaining the new LCD Cables, as the dummy has arrived:
Thank you for the video! The solid copper dummy cable looks like it fits well. Do you have an estimates around when will you be receiving production samples?
One concern I have... It looks like the through-hinge portion of this is going to stay relatively static during screen/lid motion. That would mean that the mechanical motions would be carried just after the 90* directional changes. The cable will need slack to bend a bit in those areas instead of gaining slack by the coil roll contracting and enough extension to open the case to the hinge stops. This means that the minimal/maximum length for the cable is going to have less margin for error than the older 3x roll version.
The only thing that really concerns me looking at that video is having once read a book on material stresses, those sharp corners on the inside of the turns especially to the rolled bit look like kind of a bad idea. The behaviour of stresses explain that corners like that help to concentrate stresses, and is why aeroplane windows have rounded windows after IIRC it was the comet aeroplanes that came down with torn fuselages. If you could spare a few mm to round off those corners and still have it fitting in the case okay, that should be much less likely to start tearing.
I made a quick video explaining the new LCD Cables, as the dummy has arrived:
Nice visualisation of that solution, could work indeed much better that way. I also noticed those two 90° corners. ^^"" Besides rounding them more, something like that could also work:
View attachment 30285
A concern I have:
A cable that is rolled many times through the hinge will have the physical movement of opening and closing the lid dispersed amongst the rolls... so the more rolls, the less overall stress on the cable every time you move the lid.
So I'm concerned that this new cable with no full rolls will actually concentrate the stress in one or two areas much much more with every movement.
Can anyone see what I'm getting at here?
Edit: rolling a piece of paper will stress the whole sheet... but that stress is dispersed over the whole sheet and the stress at any one point is relatively minor.
Bending a piece of paper will concentrate all that stress along the bend line.
Rolling the cable reduces the amount of flex of the cable by the number of turns in the roll.
I don't worry about the center of EDs cable where the traces are parallel to the roll, but I don't see how this design avoids flexing the sections of the cable where the traces are curved. I fear that the cable will break in those sections.
Given a choice, I'd choose the rolled cable.
It looked good to me, especially with the sharp angles smoothed out. Even with the video, it's still hard to imagine the dynamics of movement and stress across it. It's a neat design thoughWell, the manufacturer is also simulating and evaluating it. I'll wait for their reply. They probably got a lot more experience with flex cables than any of us here.
[doublepost=1492860725,1492859732][/doublepost]You can now feel the keymat
https://pyra-handheld.com/boards/threads/test-the-keymat.80259/