How Far is the Shadow Mask from the Phosphor Screen?
(Portions from: Jeroen H. Stessen (Jeroen.Stessen@philips.com).) This is simple geometry – similar triangles (at least for a good approximation). It is easy to do the calculations based on the distance between the electron guns and the horizontal stripe pitch of the CRT (assuming slot mask or Trinitron – just a little more trouble for dot mask to convert the dot pitch). Dot pitch: 0.3 mm | | ___________________________________ Phosphor screen G B R G B R G B R G B R G B ^ \|/ 15 mm – —– —– —– —– ——— Shadow mask /|\ ^ / | \ | / | \ 350 mm / | \ | / | \ v B-gun G-gun R-gun —————- Electron guns (center of deflection) | | | | Gun pitch: 7 mm (Cool diagram based on efforts of Jeroem Stessen.) Be aware that both face-plate and shadow-mask are curved and that the radius of curvature is much larger than the distance to the guns. The screen is relatively flat. This too has consequences for the calculation. Oh, heck. At the center of the screen, we have: Distance betw
(Portions from: Jeroen H. Stessen (Jeroen.Stessen@ehv.ce.philips.com)). This is simple geometry – similar triangles (at least for a good approximation). It is easy to do the calculations based on the distance between the electron guns and the horizontal stripe pitch of the CRT (assuming slot mask or Trinitron – just a little more trouble for dot mask to convert the dot pitch). Dot pitch: 0.3 mm | | ___________________________________ Phosphor screen G B R G B R G B R G B R G B ^ \|/ 15 mm – —– —– —– —– ——— Shadow mask /|\ ^ / | \ | / | \ 350 mm / | \ | / | \ v B-gun G-gun R-gun —————- Electron guns (center of deflection) | | | | Gun pitch: 7 mm (Cool diagram based on efforts of Jeroem Stessen.) Be aware that both face-plate and shadow-mask are curved and that the radius of curvature is much larger than the distance to the guns. The screen is relatively flat. This too has consequences for the calculation. Oh, heck. At the center of the screen, we have: Distan
(Portions from: Jeroen H. Stessen (Jeroen.Stessen@philips.com).) This is simple geometry – similar triangles (at least for a good approximation). It is easy to do the calculations based on the distance between the electron guns and the horizontal stripe pitch of the CRT (assuming slot mask or Trinitron – just a little more trouble for dot mask to convert the dot pitch).
