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[Official] Mechanical Keyboard Guide - Page 634

post #6331 of 14551
Quote:
Originally Posted by TwoCables View Post
I got quite a clacky sound from bottoming out on this rubber dome keyboard, so I now have to say that it depends on the keyboard (this isn't my picture):
Usually you will have a top hard plastic sheet that the keys pop on to, that has a bit cut out to expose the membrane above the key. Depending on how the board is designed, you will get some hitting of the key against that plastic. Usually the plastic is thin though, and has a layer of rubber (the rubber membrane) under it.
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post #6332 of 14551
Quote:
Originally Posted by sefwe View Post
Ah thanks. I just run on some page listing IBM's keyboards and they all used the word membrane. Made me confused, since i wasnt exactly interested, after making initial decision whether to keep it, or get a new one. Gave it away to some wanting soul, for some reason he was interested. The reduced keyway made a difference though, especially with double click(dodging in UT++, and like a base for every trick).

Makes me wonder why it isnt yet picked up as the latest BUZZword. like. "Get our keyboard, save 10ms!" Or "Overclock your keyboard - hack off the buttons!"
You're welcome! But I forgot to say that the very first post of this thread (literally, Post #1) explains it the best - beginning at the section entitled "Rubber Dome". It explains how with rubber dome keyboards, there's a rubber sheet on top of a plastic membrane sheet which has traces that don't touch each other until a key is pressed. So when a key is pressed down, the little black pad on the rubber sheet (underneath each key, up inside the rubber domes) makes contact with the contact area on the membrane sheet which completes the circuit. So here's a picture to illustrate it:





So now the IBM Model M is considered to be a Membrane board because it has a plastic-like membrane similar to the one underneath the sheet of rubber in a rubber dome keyboard. In the animating image below, it's possible to see where contact is made once the spring buckles:



When it buckles, that little black lever at the bottom of the spring is pushed down and makes contact with the membrane.

Quote:
Originally Posted by Crazy9000 View Post
Usually you will have a top hard plastic sheet that the keys pop on to, that has a bit cut out to expose the membrane above the key. Depending on how the board is designed, you will get some hitting of the key against that plastic. Usually the plastic is thin though, and has a layer of rubber (the rubber membrane) under it.
Yep! This is exactly how that keyboard is made.
Edited by TwoCables - 8/24/10 at 11:45pm
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post #6333 of 14551
Quote:
When it buckles, that little black lever at the bottom of the spring is pushed down and makes contact with the membrane.
It's a bit more elaborate than that. In a rubber dome keyboard, the rows and columns that the keyboard controller scans are on one sheet, and are seperated at the contact point. On the Model M (and a lot of other mechanical membrane switches and some early non-mechanical ones) the contacts are on separate sheets, and the appropriate contacts face each other, seperated by a third sheet that goes in between them. When the hammer strikes down, it hits into the contact on the top sheet which mashes them onto the one on the bottom sheet.

If you pull a key off a Model M and peer down, all you will see is black. That's because they have the whole thing covered by a sheet of rubber. Thus Model Ms have a good deal more spill resistance than a rubber dome keyboard if something manages to spill into the membrane.
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post #6334 of 14551
Quote:
Originally Posted by ch_123 View Post
It's a bit more elaborate than that. In a rubber dome keyboard, the rows and columns that the keyboard controller scans are on one sheet, and are seperated at the contact point. On the Model M (and a lot of other mechanical membrane switches and some early non-mechanical ones) the contacts are on separate sheets, and the appropriate contacts face each other, seperated by a third sheet that goes in between them. When the hammer strikes down, it hits into the contact on the top sheet which mashes them onto the one on the bottom sheet
That is the case with almost all rubber dome keyboards today as well.
post #6335 of 14551
Wow you guys are really into keyboards. I admit im scared.
post #6336 of 14551
I know it's pathetic.
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post #6337 of 14551
Quote:
Originally Posted by lmnop View Post
I know it's pathetic.
Could be worse.

I mean this could be a thread about people loving membrane keyboards.
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post #6338 of 14551
Thread Starter 
Quote:
Originally Posted by Kamakazi View Post
Could be worse.

I mean this could be a thread about people loving membrane keyboards.
Shoot me now
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post #6339 of 14551
Quote:
Originally Posted by Manyak View Post
Shoot me now
Only if all your keyboards are going to me in your will.*


*This just proves anything can be brought back around to keyboards in one easy step.
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post #6340 of 14551
Quote:
Originally Posted by Kamakazi View Post
Only if all your keyboards are going to me in your will.*


*This just proves anything can be brought back around to keyboards in one easy step.
buy the Deck 82 Toxic someone from OCN needs to win this auction to save face.
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