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公开(公告)号：GB2291771A
公开(公告)日：1996-01-31
申请号：GB9414960
申请日：1994-07-23
Applicant: IBM
Inventor： LEAVER DAVID
Abstract: Cathode ray tube display apparatus includes a cathode ray tube having a screen 210 and a neck 350. In use an electron beam is directed from the neck 350 towards the screen 210 along an axis S of the cathode ray tube containing the centre of the screen. Deflection means 320 mounted on the neck deflects the beam from the axis S at a deflection centre X of the cathode ray tube to scan the beam across the screen in a raster pattern. Raster rotation means 300, 310 permits rotation of the raster pattern about the centre of the screen 210. The raster rotation means includes first and second coils. The first coil 300 is located around the neck 350 at or near the deflection centre X to generate, in use, a first magnetic field in the path of the electron beam. The second coil 310 is parallel to the first coil 300 and located around the neck 350 on the side of the deflection centre X remote from the screen 210 to generate, in use, a second magnetic field, of opposite polarity to the first field, in the path of the electron beam. The raster rotation means maybe used to counteract the influence of an ambient magnetic field.
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公开(公告)号：DE69402615D1
公开(公告)日：1997-05-22
申请号：DE69402615
申请日：1994-02-03
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSEY , BEETESON JOHN S
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：GB2279188B
公开(公告)日：1996-08-14
申请号：GB9312273
申请日：1993-06-15
Applicant: IBM
Inventor： JACKSON FREDERICK SAMUEL , LEAVER DAVID
IPC: H03K17/0812 , H04N3/16 , H04N3/27 , H02H7/20 , H03K4/08
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公开(公告)号：GB2279162B
公开(公告)日：1997-11-19
申请号：GB9312272
申请日：1993-06-15
Applicant: IBM
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公开(公告)号：GB2278985A
公开(公告)日：1994-12-14
申请号：GB9312270
申请日：1993-06-15
Applicant: IBM
Inventor： JACKSON FREDERICK SAMUEL , LEAVER DAVID
Abstract: A deflection apparatus for a raster scanned cathode ray tube display, the apparatus comprising: a ramp generator having a flyback circuit including a first inductor connected in series with a first transistor switch, the first transistor switch being responsive to a line drive signal to alternately open and close a current path through the first inductor between a first voltage level and a second voltage level lower than the first voltage level to generate a raster scan current signal in a deflection coil of the display, the amplitude of the raster scan current signal being determined as a function of the first voltage level and the frequency of the line drive switching signal, and a boost circuit connected to the flyback circuit, the boost circuit comprising a second inductor connected in series with a second transistor switch, the second transistor switch being responsive to a pulse signal synchronized to the line drive signal to alternately open and close a current path through the second inductor between the second voltage level and a third voltage level higher than the second voltage level to generate the first voltage level, the first voltage level being determined as a function of the third voltage level and the width of the pulses of the pulse signal; and a regulator connected to the flyback circuit and the boost circuit for varying the width of the pulses of the pulse signal as a function of the amplitude of the line scan signal to maintain a constant raster line width as the frequency of the line drive signal is varied.
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Patent Agency Ranking
公开(公告)号：GB2279216A
公开(公告)日：1994-12-21
申请号：GB9312297
申请日：1993-06-15
Applicant: IBM
Inventor： JACKSON FREDERICK SAMUEL , LEAVER DAVID , KNOX ANDREW RAMSAY , BEETESON JOHN STUART
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：GB2279190A
公开(公告)日：1994-12-21
申请号：GB9312269
申请日：1993-06-15
Applicant: IBM
Inventor： JACKSON FREDERICK SAMUEL , HENRY MICHAEL DAVID , LEAVER DAVID , WRIGHT-BOULTON NEIL
Abstract: Synchronisation apparatus comprises a phase-locked loop (46) for generating an output signal (P) and for synchronising the output signal (P) to an input signal (HSYNC). A controller (44,45) iteratively determines whether the output signal (P) is synchronised to the input signal (HSYNC) by the phase-locked loop (46) and adjusting the frequency of the output signal (P) to locate the output signal (P) within the capture range of the phase-locked loop if the output signal (P) is not synchronised to the input signal (HSYNC). The apparatus can thus maintain the output signal (P) in synchronisation with the input signal (HSYNC) despite large step changes in the frequency of the input signal extending beyond the limits of the capture range of the phase-locked loop. The apparatus is therefore especially useful in display devices for computer systems that can generate video signals corresponding to a number of different display formats.
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公开(公告)号：GB2279162A
公开(公告)日：1994-12-21
申请号：GB9312272
申请日：1993-06-15
Applicant: IBM
Inventor： HENRY MICHAEL DAVID , LEAVER DAVID , WRIGHT-BOULTON NEIL , HARE MARK WILLIAM , JACKSON FREDERICK SAMUEL
Abstract: An interrupt-driven processor system comprising a processor 10 connected via a plurality of processor input and output lines to an input means 20 in the form of a keypad or keyboard. Actuation of one of the keys of the input means generates an interrupt signal on one of the input lines which invokes an interrupt service routine in the processor. In accordance with the invention, a secondary interrupt source can be attached to each of the input lines with the interrupt service routine being designed to discriminate between an interrupt signal generated by actuation of a key and an interrupt signal generated by a secondary source. Using this technique, further interrupts can be added to an off-the-shelf processor including keypad interrupts without the need for additional interrupt controlling hardware. Furthermore, a custom-built microprocessor can be designed with fewer interrupt pins.
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公开(公告)号：NO941869A
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
CPC classification number: H01J29/003 , H01J2229/0015 , H01J2229/0053
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公开(公告)号：NO941869D0
公开(公告)日：1994-05-19
申请号：NO941869
申请日：1994-05-19
Applicant: IBM
Inventor： JACKSON FREDERICK S , LEAVER DAVID , KNOX ANDREW RAMSAY , BEETESON JOHN
IPC: G09G1/00 , H01J20060101 , H01J15/04 , H01J29/00 , H01J29/06 , H01J29/98 , H04N3/16 , H04N9/29 , H01J
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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