Does such a technology exist?

Question

lasers

Hello!
Is there a technology based on beam interruption?
Imagine a touchpad, on the surface of which there is a fine grid of rays. You poke your finger, the beams are interrupted from the side, and thus, depending on where the beams are interrupted, is transmitted to the device as a touch?
The same can be done with the keyboard, mouse, so you can draw, you can even copy 2D objects.
What do you say?

Answer 1

Yes, there is: en.wikipedia.org/wiki/Touchscreen#Infrared_grid

Answer 2

On my old reader from Sony, this is exactly the implementation of the sensor. Plus, I met an intercom with similar technology, for a long time I could not understand how a reaction occurs when you press a metal plate with numbers engraved on it. When I figured it out, I covered the entire keyboard with wet snow and watched his reaction :)