Topre switch is a keyboard switch made by Topre Corporation, of Japan.
Topre switch's electronic switch mechanism is by capacitance. This means, there is no contact between electric conductors for the switch to turn on. The key does not need to hit bottom to activate.
Topre switch's feel came from its rubber dome, not the spring.
I don't like topre switch. It has a hit-bottom finger-shock problem. Topre switch, got this rubber dome, you have to hit with certain force, and because it is rubber dome, the dome collapses at some point and sucks you down, thus hit bottom and creates a finger impact shock feel. I don't have this problem with any Cherry MX switches, nor with IBM buckling spring switch, nor romer-g.
The Name Topre
The name Topre, came from Tokyo Press, because the company was named Tokyo Press Kogyo Co Ltd, and got renamed in 1985-10 to Topre Corporation.
Topre switch patent expired in 2004
Topre Switch Keyboards
Topre key switch is most famously used in Happy Hacking Keyboard.
Keyboard with Topre switch usually costs $200 and more. It's loved by many keyboard nerds.
Here's list of keyboards with Topre switch.