Why is the Plate Tilted in an Electron Gun?

AI Thread Summary
The discussion centers on the reason for the tilt of the plate in an electron gun relative to the electron path. The tilted plate allows the electron beam to scan the entire screen instead of just a central area. Participants mention that in CRT TV tubes, magnetic deflection occurs after the beam exits the gun, which influences the design of the gun. The complexity of electron optics is highlighted, noting that specific designs depend on the application, such as high-frequency oscilloscope tubes. Understanding these factors is essential for grasping the functionality of electron guns.
SWKatzen
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Hi,
I was wondering if anybody knows why the plate in an electron gun is tilted with respect to the electron path? Or has any resources that I could read to better understand? Thanks.
 
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SWKatzen said:
I was wondering if anybody knows why the plate in an electron gun is tilted with respect to the electron path?
Tilted plate in an electron gun? Did you mean an X-ray tube?
https://en.wikipedia.org/wiki/X-ray_tube
 
No sorry, the sheet between the two plates is at an angle to the electron stream. This is what I’m not sure about-
 
SWKatzen said:
Hi,
I was wondering if anybody knows why the plate in an electron gun is tilted with respect to the electron path? Or has any resources that I could read to better understand? Thanks.
Can you link to some pages that show this? That would help us out. Thanks.

https://en.wikipedia.org/wiki/Electron_gun

1602441306981.png
 
SWKatzen said:
No sorry, the sheet between the two plates is at an angle to the electron stream. This is what I’m not sure about-
So that the electron beam will scan the whole screen rather than just a small region in the central area
 
davenn said:
So that the electron beam will scan the whole screen rather than just a small region in the central area
In a CRT TV tube, the deflection is magnetic and comes after the beam leaves the gun. We'd really need to see the particular gun that you are discussing.
 
sophiecentaur said:
n a CRT TV tube, the deflection is magnetic and comes after the beam leaves the gun.

Yes, I know that
 
davenn said:
Yes, I know that
Yeah, I thought you would but did the OP know? It could be that the throat of the gun is flared because there is a finite magnetic deflection, even that far back.
Electron optics is pretty damn hard stuff and the particular situation determines a lot about the gun design. Like, for instance, the high frequency oscilloscope tubes that used post deflection acceleration in order to get a bright line plus a fast scan. (Now that came out of my memory from a long time ago.)
 

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