Low Capacitance Stator CRT Deflection Yoke
Original Publication Date: 1981-Oct-01
Included in the Prior Art Database: 2005-Feb-12
A conventional "stator" yoke consists of a core structure and two mutually perpendicular deflection coils. The high frequency (horizontal) and the low frequency (vertical) coils share wire cavities of the core structure, and they may be in physical contact. In such case, the electrical isolation between the coils is provided by the magnet wire insulation itself. Due to the physical closeness, distributed capacitance exists between the coils, which provides an AC path for the current from the horizontal to the vertical deflection circuits. This coupling can cause a ringing in each horizontal scan after retrace. This article describes a yoke core structure in which the horizontal and vertical coils are wound on separate, nested structures to decrease coupling between the coils.