General > General Technical Chat
How a color picture tube (CRT) is manufactured.
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Gyro:
I was interested to see the profile of the shadowmask holes. I had always assumed that they were, well, just holes. The different size and profiling of the etching from each side, to avoid stray electrons bouncing down the 'length' of the holes, is really clever. Real attention to detail.

I once pulled a shadowmask out of an old tube. The mask itself was incredibly easy to dent with even a fairly gentle touch, but I was surprised that the frame could be held so firmly (and presumably repeatedly) by the bimetal strips onto the mounting pins in the faceplate, very good tolerancing. Also the hand applied foil shielding to prevent stray electrons from leaking around round the outside of the frame.
coppice:

--- Quote from: Gyro on November 09, 2022, 07:43:45 pm ---I was interested to see the profile of the shadowmask holes. I had always assumed that they were, well, just holes. The different size and profiling of the etching from each side, to avoid stray electrons bouncing down the 'length' of the holes, is really clever. Real attention to detail.

--- End quote ---
Real attention to the originals made by simpler methods sucking.
tom66:

--- Quote from: coppice on November 09, 2022, 07:49:06 pm ---
--- Quote from: Gyro on November 09, 2022, 07:43:45 pm ---I was interested to see the profile of the shadowmask holes. I had always assumed that they were, well, just holes. The different size and profiling of the etching from each side, to avoid stray electrons bouncing down the 'length' of the holes, is really clever. Real attention to detail.

--- End quote ---
Real attention to the originals made by simpler methods sucking.

--- End quote ---

Well, arguably Trinitron is a superior solution to the shadowmask, barring the requirement for the thin wire through the centre of the display.
coppice:

--- Quote from: tom66 on November 09, 2022, 08:17:04 pm ---
--- Quote from: coppice on November 09, 2022, 07:49:06 pm ---
--- Quote from: Gyro on November 09, 2022, 07:43:45 pm ---I was interested to see the profile of the shadowmask holes. I had always assumed that they were, well, just holes. The different size and profiling of the etching from each side, to avoid stray electrons bouncing down the 'length' of the holes, is really clever. Real attention to detail.

--- End quote ---
Real attention to the originals made by simpler methods sucking.

--- End quote ---

Well, arguably Trinitron is a superior solution to the shadowmask, barring the requirement for the thin wire through the centre of the display.

--- End quote ---
It took many years for Sony to get a Trinitron of any reasonable size to work well, and to the end a gentle tap on the case made the picture go crazy. The horizontal stabiliser wires were generally hard to see, but on some screens once you noticed them it was hard to look away.
Gyro:
I've always wanted to see a Trinitron mask first hand. The frame must be substantial to resist the pull of all those vertical wires, even if each one is minimally tensioned. I wonder if the horizontal support wires (yes, they can be irritating on a CAD monitor, as can the vibrations!) are threaded between the vertical ones or spot welded to each  - both sound unfeasibly difficult.
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