Picture display system including a deflection unit with a double saddle coil system.

摘要

Self-convergent picture display system with a colour display tube (1) and an electromagnetic deflection unit (5). The deflection unit (5) comprises a field deflection coil (8) and a line deflection coil (7) which are both of the saddle type and are particularly wound directly on a support. The deflection unit also comprises a pair of magnetically permeable portions (12, 13) which are arranged symmetrically with respect to the plane of symmetry of the field deflection coil (8) on either side of the tube axis. The magnetically permeable portion withdraw magnetic flux from the end of the yoke ring in order to extend the vertical deflection field. A self-convergent system can be realised with different screen formats by choosing different lengths of the magnetically permeable portions.