Patent
Adjustable pincushion correction circuit
TLDR
In this paper, a saturable transformer has three windings, one being in series with a horizontal deflection coil to introduce a parabolic reactance variation to correct for side pincushion distortion.Abstract:
In a television receiver, a saturable transformer has three windings, one being in series with a horizontal deflection coil to introduce a parabolic reactance variation to correct for side pincushion distortion. An adjustable correction circuit includes a transistor integrator for producing in another winding of the saturable transformer a vertical parabolic current. The last winding of the saturable transformer is coupled through a pair of switching diodes to a pair of variable inductors. The diodes conduct alternately at the beginning and end of the vertical scanning period. The variable inductors may be mounted coaxially with a common movable core to allow inverse side correction, or may be mounted separately with separate movable cores to allow independent side correction.read more
Citations
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Patent
Alignment of cathode ray tube displays using a video graphics controller
James R. Webb,Ron C. Simpson +1 more
TL;DR: In this article, a host computer (10) stores correction factor data and video image data in video graphics controller RAM (20) for aligning video images in CRT devices.
Patent
Alignment of cathode ray tube video displays using a host computer processor
James R. Webb,Ron C. Simpson +1 more
TL;DR: In this paper, a system for automatically aligning video images on a display device such as a cathode ray tube (CRT) was proposed, using previously generated correction factor data retrieved from a characterization module within the display device or from a convenient storage location.
Patent
Apparatus for deflecting electron beams and color cathode ray tube apparatus incorporating this deflecting apparatus
Masahiro C,Yuichi C +1 more
TL;DR: In this paper, the first and second saturation control coils are magnetically coupled to the first impedance control coils, respectively connected to horizontal deflection coils, and the vertical deflection current is controlled by the first, second and second impedance control coil in accordance with the vertical deformation of the electron beams.
Patent
Horizontal deflection circuit in a television device
TL;DR: In this article, a horizontal deflection circuit in a television device comprises a circuit for generating a saw-tooth waveform current for horizontal de-deflection, a horizontal coil supplied with the sawtooth current, and a saturable reactor type linearity coil having a winding connected in series with the horizontal coil.
Patent
Dynamic focussing circuit for cathode ray tube and transformer for use therein
TL;DR: In this paper, a diode modulation circuit provides a horizontal yoke coil current which is modulated in a manner to correct for side pin cushion distortion in the resultant CRT television picture tube display.
References
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Patent
Circuit arrangement for generating in a picture display device a sawtooth current of line frequency having an amplitude varying at field frequency
A Boekhorst,J Rietveld +1 more
TL;DR: In this article, the modulator is controlled by an amplifier comprising a linear and a voltage-dependent resistor which ensure that a third power component is added also to said field deflection current.
Patent
Saturable reactor for correcting raster distortion
TL;DR: In this article, a cross-shaped core having a yoke on the center portion of the core and protrusions at right angles to the yoke is divided into two coil parts which are wound on the right and left yoke arms.
Patent
Side pincushion distortion correction circuitry
Sakurai Masami,Tsuruta Saburou +1 more
TL;DR: A side pincushion distortion correction circuit which is supplied with drive current having a parabolic wave form synchronizing with a vertical deflection current signal comprises a saturable reactor connected in series with a horizontal deflection coil and an additional saturated reactor connected equivalently in parallel with the same deflection coils, said additional reactor having its unductance varied in the opposite direction to that of the first mentioned reactor.