Consumer Electronics

DELTA GUN AND IN-LINE GUN

Shadow mask colour picture tubes are trigun, tricolour picture tubes with delta guns, Fig. 31.9. In picture tubes incorporating delta guns, each gun is positioned at an angle of 120° along the vertices of an equilateral triangle inscribed in a circle as shown in Fig. 31. 10(a). Each gun can have the maximum possible size in the tube because of equal spacing between them. However, convergence adjustmens must correct for the guns in different planes.

In in-line guns all the three guns are in one horizontal plane angled in towards the centre. Fig. 31.10(b).For the same neck diameter, each in-line gun is smaller than each delta gun. With smaller guns, it is more difficult to obtain a high-intensity spot with sharp focus, ...