General > General Technical Chat
How a color picture tube (CRT) is manufactured.
BrianHG:
SONY TRINITRON Television: HOW IT WAS MADE
I think the Trinitron grill was also double sided optical exposed, then etched away.
Otherwise, for the date of the first available Trinitrons, it would have been too early in time to use more modern techniques like laser cutting and attaching wires would be impossible to maintain tension under temperature drift due to variances in length of such wires.
Gyro:
Thanks for the video.
Yes, that makes much more sense - a lot less exciting than wires though. :(
james_s:
--- Quote from: Gyro on November 09, 2022, 08:55:45 pm ---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.
--- End quote ---
I have dissected a couple of dead Triniton tubes over the years, somewhere I have some pictures. The frame is indeed substantial, in a 27" tube it is made out of square stock that is around 1" thick. The aperture grill is made from a thin sheet that is spot welded to the frame and has vertical slits etched down the length, they have the appearance of wires but if you look closely they are flat and part of the material around the edges. Depending on the size there are either one or two hair-thin wires stretched across the face of the grill, spot welded to leaf springs that are attached to the frame.
coppice:
I wonder how the flat screen CRT business really worked out? It seems they took years to perfect, so presumably a lot of investment went into them. They never really took over the market, so the volumes were limited compared to the preceding tubes. Then their market window started to close quite quickly, as other screen technologies took over.
james_s:
It was just too little too late. The flat Trinitron displays looked great, I still have a 20" Sony SVGA monitor that I used for years. They achieved widespread use, but they came near the end of the CRT era so it's only natural that they didn't achieve more widespread use.
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