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公开(公告)号：GB2304984A
公开(公告)日：1997-03-26
申请号：GB9604226
申请日：1996-02-28
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
Abstract: An electron source comprises cathode means 20 and a permanent magnet 60 perforated by a plurality of channels 70 extending between opposite poles thereof. The magnet generates, in each channel, a magnetic field which forms electrons received from the cathode means into an electron beam for guidance towards a target e.g. phosphors 80. Grid electrode means 40 is disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each channel. A magnetic field null region 61 adjacent the entrance to each channel is positioned at a location remote from the grid electrode means. Because the null region is positioned remotely from the grid electrodes, flow of electrons into the channels can be improved without increasing electrode drive voltages.
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公开(公告)号：GB2297422A
公开(公告)日：1996-07-31
申请号：GB9501277
申请日：1995-01-24
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
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公开(公告)号：DE69022731T2
公开(公告)日：1996-05-02
申请号：DE69022731
申请日：1990-11-27
Applicant: IBM
Inventor： SMITH KENNETH GEORGE , BEETESON JOHN
Abstract: A display comprising a cathode ray display tube (1) having an electromagnetic deflection yoke (2) is described. A pair of first deflection coils (7,6) are located symmetrically about the longitudinal axis of the tube (1) on opposite sides of the yoke (2) for producing within the tube (1) a first magnetic deflection field. A pair of second deflection coils (8,20) are similarly located symmetrically about the longitudinal axis on opposite sides of the yoke (2) for producing within the tube (1) a second magnetic deflection field at right angles to the first deflection field. The display is further provided with a pair of first cancellation coils (4,3) connected to the first deflection coils (7,6) for producing a first cancellation field which tends to cancel a first stray field produced by the first deflection coils (7,6). Support means (10,11) secure the first cancellation coils symmetrically about the longitudinal axis. The display additionally comprises a pair of second cancellation coils (50,32) coupled to the second deflection coils (8,20) for producing a second cancellation field which tends to cancel a second stray field produced by the second deflection coils (8,20). Further support means (51,52) are provided for positioning the second cancellation coils (50,32) symmetrically about the longitudinal axis in such a way that a plane containing a second cancellation coil (50) is perpendicular to any plane containing a first cancellation coil (4). Preferably, the display also comprises control means (64) for generating a predetermined cancellation current in the second cancellation coils (50,32) in response to a particular second deflection current in the second deflection coils (8,20).
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公开(公告)号：GB2294172A
公开(公告)日：1996-04-17
申请号：GB9420729
申请日：1994-10-14
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
Abstract: Moire interference detection apparatus (100;110) for a raster-scanned cathode ray tube display comprises a band-pass filter (360;750) for generating an output signal (395;790) in response to a signal indicative of the pixel frequency of a displayed image in a direction of raster scan falling within the pass band of the filter. Control means (350;270) varies the centre frequency of the pass band of the filter in dependence on an active video period of the image in said direction of raster scan, the spacing of adjacent phosphor elements of the cathode ray display tube (210) of the display in said direction of raster scan, and the scan size in said direction of raster scan.
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公开(公告)号：DK0487796T3
公开(公告)日：1995-12-18
申请号：DK90312872
申请日：1990-11-27
Applicant: IBM
Inventor： SMITH KENNETH GEORGE , BEETESON JOHN
Abstract: A display comprising a cathode ray display tube (1) having an electromagnetic deflection yoke (2) is described. A pair of first deflection coils (7,6) are located symmetrically about the longitudinal axis of the tube (1) on opposite sides of the yoke (2) for producing within the tube (1) a first magnetic deflection field. A pair of second deflection coils (8,20) are similarly located symmetrically about the longitudinal axis on opposite sides of the yoke (2) for producing within the tube (1) a second magnetic deflection field at right angles to the first deflection field. The display is further provided with a pair of first cancellation coils (4,3) connected to the first deflection coils (7,6) for producing a first cancellation field which tends to cancel a first stray field produced by the first deflection coils (7,6). Support means (10,11) secure the first cancellation coils symmetrically about the longitudinal axis. The display additionally comprises a pair of second cancellation coils (50,32) coupled to the second deflection coils (8,20) for producing a second cancellation field which tends to cancel a second stray field produced by the second deflection coils (8,20). Further support means (51,52) are provided for positioning the second cancellation coils (50,32) symmetrically about the longitudinal axis in such a way that a plane containing a second cancellation coil (50) is perpendicular to any plane containing a first cancellation coil (4). Preferably, the display also comprises control means (64) for generating a predetermined cancellation current in the second cancellation coils (50,32) in response to a particular second deflection current in the second deflection coils (8,20).
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Patent Agency Ranking
公开(公告)号：NO941869L
公开(公告)日：1994-12-16
申请号：NO941869
申请日：1994-05-19
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSAY , BEETESON JOHN
Abstract: A cathode ray tube display having reduced electric field emissions comprising a cathode ray tube 100, an element 200 for detecting modulations in the final anode voltage of the CRT, the signal not being directly dependent on the deflection driving means 115. A matching network 205 provides phase and gain correction to the signal from element 200, amplification means 210 receives the signal from network 205 and an emission means 215 radiates a cancelling electric field dependent on the modulations detected by said element 200.
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公开(公告)号：NO914254D0
公开(公告)日：1991-10-30
申请号：NO914254
申请日：1991-10-30
Applicant: IBM
Inventor： BEETESON JOHN , SMITH KENNETH GEORGE
Abstract: A display comprising a cathode ray display tube (1) having an electromagnetic deflection yoke (2) is described. A pair of first deflection coils (7,6) are located symmetrically about the longitudinal axis of the tube (1) on opposite sides of the yoke (2) for producing within the tube (1) a first magnetic deflection field. A pair of second deflection coils (8,20) are similarly located symmetrically about the longitudinal axis on opposite sides of the yoke (2) for producing within the tube (1) a second magnetic deflection field at right angles to the first deflection field. The display is further provided with a pair of first cancellation coils (4,3) connected to the first deflection coils (7,6) for producing a first cancellation field which tends to cancel a first stray field produced by the first deflection coils (7,6). Support means (10,11) secure the first cancellation coils symmetrically about the longitudinal axis. The display additionally comprises a pair of second cancellation coils (50,32) coupled to the second deflection coils (8,20) for producing a second cancellation field which tends to cancel a second stray field produced by the second deflection coils (8,20). Further support means (51,52) are provided for positioning the second cancellation coils (50,32) symmetrically about the longitudinal axis in such a way that a plane containing a second cancellation coil (50) is perpendicular to any plane containing a first cancellation coil (4). Preferably, the display also comprises control means (64) for generating a predetermined cancellation current in the second cancellation coils (50,32) in response to a particular second deflection current in the second deflection coils (8,20).
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公开(公告)号：DE69805678T2
公开(公告)日：2003-01-23
申请号：DE69805678
申请日：1998-01-29
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY , PIETRZAK CHRISTOPHER CARLO
Abstract: A virtual remote cathode has the position of a space charge cloud associated with it fixed by the geometry of a fixed insulating plate (902). The plate (902) can be made to accurate dimensions and hence the virtual remote cathode to control grid (502) distance can be accurately controlled and will not change as a result of any mechanical, electrical or physical changes in the construction. The fixed insulating plate (902) is located on a surface of the control grid (502) facing the cathode (510).
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公开(公告)号：DE69525980T2
公开(公告)日：2003-01-09
申请号：DE69525980
申请日：1995-12-27
Applicant: IBM
Inventor： KNOX ANDREW , BEETESON JOHN
IPC: H01J31/12 , B41J2/447 , G09G1/20 , G09G3/22 , H01J3/02 , H01J3/24 , H01J9/02 , H01J29/46 , H01J29/68 , H01J29/70 , H01J29/80 , H01F1/113
Abstract: An electron source having a cathode and a permanent magnet having perforated channels extending between opposite poles of the magnet. Each channel forms electrons received from the cathode into an electron beam for guidance towards a target. The electron source has applications in a wide range of technologies, including display technology and printer technology.
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公开(公告)号：DE69804702D1
公开(公告)日：2002-05-16
申请号：DE69804702
申请日：1998-01-29
Applicant: IBM
Inventor： BEETESON JOHN , KNOX ANDREW RAMSAY
Abstract: A display device comprises a cathode means (20) for emitting electrons and a permanent magnet (60) having a two dimensional array of channels (70) extending between opposite poles of the magnet. The magnet generates, in each channel, a magnetic field for forming electrons from the cathode means into an electron beam. A screen (90) receives an electron beam from each channel, the screen having a phosphor coating (80) facing the side of the magnet remote from the cathode, the phosphor coating comprising a plurality of areas, each area being capable of illumination, at least one of the areas being capable of illumination by a plurality of the electron beams. Grid electrode means (40) are disposed between the cathode means and the magnet for controlling flow of electrons from the cathode means into each channel, the grid electrode means comprising a plurality of elements each element corresponding to a different area of the phosphor capable of illumination. First anode means (50) is disposed between the magnet and the screen for accelerating the electron beam towards the screen.
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