Abstract: A convergence apparatus in a color CRT display scanning the display surface by a plurality of electron beams, comprising convergence coils for pole pieces which impart electromagnetic action to the electron beams and a transistor circuit for superposing both of the horizontal and vertical convergence correction currents to each of the convergence coils whereby the precise convergence correction is attained.

Abstract: A convergence apparatus in a convergence circuit of a CRT, comprises,Means for dividing a horizontal parabolic waveform voltage in suitable voltage levels corresponding to a vertical parabolic waveform voltage; means for shaping the waveforms of the divided voltage signals; means for composing the shaped voltage signals to give the shaped covergence correction voltage signal; andMeans for feeding the current corresponding to the shaped convergence correction voltage signal waveform to a convergence coil to correct the scanning positions of the electron beams.

Abstract: A thin metallic film is superposed on a light transmitting, dielectric substrate through a lattice-shaped, electric conductor disposed on the substrate to maintain it spaced away from the latter. The film is provided on the exposed surface with a lattice-shaped electric rib and fixed at the periphery to the substrate by a binder.