|Originally Posted by Marconelly|
30" TV weight 150 pounds. Can it really be that it's just the tube glass that it's so heavy?
I know they are using some kind of leaded glass to prevent X-ray radiation from the electron beam, is that why it's so heavy?
|I just have a problem understaning how a part made of hollow glass can be so heavy.|
|Originally Posted by devo6273|
well, anyone feel free to correct me if I'm wrong, but here's what I've been told...
Old CRTs had rounded screens for a reason, the glass can withstand a lot more force that way. Think of ancient architecture... there were archways, not square doorways because the force gets distributed down the sides of the arch.
With flat glass, the strength of the glass itself has to support all that pressure, so to make the screens flat they have to be very thick glass (thicker=stronger)
Oh and the pressure is coming from the fact that the inside has to be under vacuum for the CRT to work properly. On the other side of the screen is atmospheric pressure, approx 14.7 pounds per square inch at sea level, if I remember correctly... so 14.7 times the area of your screen means a pretty large force.
This is why when you go to lift a CRT, it feels like all the weight is in the front where the screen is.
|Originally Posted by TonyBDA|
The front of the tube is at least a half inch thick. Glass is heavy.
It has nothing to do with weather the screen is curved or flat.
The 'Lead' in the glass is an oxide, not metallic lead...you wouldn't be able to see through it if it was.