公开(公告)号：EP0736220B1

公开(公告)日：2000-05-10

申请号：EP95930692.9

申请日：1995-09-26

申请人： Koninklijke Philips Electronics N.V.

发明人： DE WIT, Hendrik, Jan

IPC分类号： H01J29/96 ,  H04N9/29 ,  G12B17/02

CPC分类号： H04N9/29 ,  H01J29/003 ,  H01J2229/0053

摘要： Colour display tube with a shadow mask, a shield of a ferromagnetic material and a demagnetizing device having a set of demagnetizing coils. The demagnetizing device is provided with means for energizing the demagnetizing coils in two steps which are shifted in time with respect to each other, while the location of the turns of the demagnetizing coils is such that upon the passage of current through only the one coil, the magnetic field generated by said coil is capable of magnetizing those parts of colour selection electrode and screen which are not magnetized upon the passage of current through only the other coil, and conversely.

公开(公告)号：EP0830790B1

公开(公告)日：2001-10-10

申请号：EP97908451.4

申请日：1997-04-04

申请人： Koninklijke Philips Electronics N.V.

发明人： DE WIT, Hendrik, Jan

IPC分类号： H04N9/29

CPC分类号： H04N5/65 ,  G06F1/1601 ,  G06F2200/1611 ,  H04N9/29

摘要： A display device comprising a display tube having a display screen with a pattern of phosphor elements. To reduce mislandings of electron beams, the display tube is accomodated within an external magnetic shield which is formed by one or more individual frames composed of bars of a magnetizable material and one or more excitable coils. Said coils may be arranged, for example, alongside the frames.

公开(公告)号：EP0738422B1

公开(公告)日：2001-10-04

申请号：EP95933594.4

申请日：1995-10-25

申请人： Koninklijke Philips Electronics N.V.

发明人： VAN DER ZAAG, Pieter, Jan ,  VAN DER VALK, Pieter, Johan ,  DE WIT, Hendrik, Jan

IPC分类号： H01J29/76 ,  C04B35/26 ,  H01F1/34

CPC分类号： H01F41/0246 ,  C04B35/2683 ,  H01F2041/0711 ,  H01J29/76 ,  H01J2229/7031

摘要： The invention relates to a deflection ring of sintered MgZn-ferrite material. In accordance with the invention, this deflection ring is characterized in that the majority of the grains of the sintered material have a monodomain structure. By virtue thereof, a relatively small heat dissipation occurs in the ring when it is used in a cathode ray tube. The average grain size of the sintered MgZn-ferrite material is preferably 2.8 micrometers or less. MgZn-ferrite materials whose composition corresponds to the formulaMg1-zZnzFe2-yO4, wherein 0.1