Dirk Willem Harberts

High-deflection-sensitivity CRTs with filled yoke

— The trend towards slim CRTs requires deflection yokes (DYs) with an improved deflection sensitivity. We present a new method to improve the deflection sensitivity by 15–25% by filling the space between the ferrite core and deflection coils with a soft magnetic material. The effect was analyzed in terms of a simplified two-dimensional model. These model calculations were confirmed by three-dimensional simulations and by experiments on a DY design for the Philips 29-in. Real Flat CRT.

P‐22: Hysteresis Loss in the Ferrite Core of a Deflection Yoke

A new method is developed for estimating the hysteresis loss of a ferrite core of a deflection yoke. With this method, the losses of various ferrite materials are measured as a function of frequency and temperature. The results are compared to theory and are used to estimate the hysteresis loss in a 17″CMT ferrite core.