this post was submitted on 30 Jun 2024
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Digital Art

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[–] april 46 points 6 days ago* (last edited 6 days ago) (6 children)

Tablet pens are powered by a changing magnetic field generated by the tablet (induction). They only have power when near the tablet.

[–] Cosmonaut_Collin 15 points 6 days ago (1 children)
[–] [email protected] 9 points 5 days ago (1 children)
[–] [email protected] 9 points 5 days ago

You're welcome.

[–] [email protected] 7 points 5 days ago

Some require actual charging so I can see how someone might get confused when switching to a different model

[–] dustyData 7 points 5 days ago

They often have a small capacitor that feeds them and acts as a tiny, couple of minutes long, battery.

[–] [email protected] 4 points 5 days ago (1 children)

That's got to be a really tiny field. I have a remarkable, and can use it for weeks before charging it. Broadcast energy, as you describe, is relatively expensive, because there's a drain whether or not there's an active sink; and even so, that's crazy.

How does that work? It detects the touch of the pen, since it doesn't react to anything else. Is there a conductor on the surface of the screen?

[–] Evotech 3 points 5 days ago

It's probably not on when there's no pen nearby. You can automatically detect those things

[–] [email protected] 2 points 5 days ago* (last edited 5 days ago) (1 children)

What portion of the electromagnetic field is produced by the display?

Do these pens work with tablets that have ePaper displays?

(no experience with these pens; STEM nerd popping in from the main page. I was only aware of styluses <stylusi? styli? styleese?> and battery pens)

[–] [email protected] 1 points 5 days ago

Personally I have huion H1060P which doesn't have screen and has battery free pen. The pen is detected some distance from the surface and the same goes for the pressure on the tip and button clicks on the pen. Pretty interesting.