Dynamic focus circuit

Abstract

Abstract PURPOSE:To obtain a satisfactory parabola wave for the dynamic focus of a CRT by mixing the output of a perpendicular parabola wave generating circuit and the output of a horizontal sawtooth wave generating circuit in which an amplitude is made large in proportion to a frequency, amplifying an integrating perpendicular and horizontal components, respectively, and outputting them. CONSTITUTION:A signal synchronizing with a perpendicular deflecting signal outputted by a perpendicular parabola wave generating circuit 1 and horizontal sawtooth signal synchronizing with a horizontal deflecting signal, in which the amplitude is made large in proportion to a horizontal frequency, outputted from a horizontal sawtooth wave generating circuit 2 controlled with an ampli tude control circuit 3 are mixed by a mixing circuit 4. The mixed output from the circuit 4 is given to an output circuit 5, the perpendicular components are amplified as they are, the horizontal components are integrated, the output amplitude is made aproximately fixed and without waveform distortion even when the horizontal frequency is changed, and the satisfactory parabola wave for the dynamic focus of the CRT is outputted from the circuit 5.

Inventors

• 👤 Susumu Fujita
• 👤 進 藤田

Bibliographic Details