Deflection amplifier system for raster scanned cathode ray tube displays
AssigneeSperry Corporation
InventorThomas W. Spilsbury
Life of this patent
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Abstract
An efficient cathode ray deflection amplifier is provided having a selectable scan rate capability, providing sweep rate linearity through the use of a feed back arrangement that also cooperates in a self-adaptive manner with respect to commanding changes in the raster scan rate or display size.
Claims6
Apparatus for raster scanning of a cathode ray beam of a display device including:
- signal generator means for generating a first pulsed wave train selectively at least between a first and a second repetition frequency,
- first circuit means coupled to said signal generator means for generating a second pulsed wave train according to said selected frequency in the form of delayed trigger pulses,
- sweep generator means responsive to said first circuit means for generating a substantially linear sweep voltage wave train having a variable amplitude control,
- summation means having first input means responsive to said linear sweep generator means and having second input means,
- inverter amplifier means coupled by low pass filter means to the output of said summation means,
- fly back switching control means having first and second terminal means transformer-coupled to said signal generator means and having third and fourth terminal means,
- cathode ray beam deflection coil means associated with said display device,
- said first terminal means being directly coupled by conductor means to a first end of said cathode ray beam deflection coil means at said third terminal means,
- said inverter amplifier means having an output coupled to said fourth terminal means,
- said cathode ray beam deflection coil means being coupled at a second end thereof through first resistor means between said summation means and said low pass filter means, and
- second circuit means responsive to current flow through said first resistor means for supplying a signal representative thereof to said second input means.
Cathode ray display horizontal deflection apparatus for generating a raster scanned display field having selectively variable scan parameters, said apparatus being of the transformer coupled, resonant fly back switch type and being self-adaptive to selection of said selected scan parameters comprising:
- horizontal deflecting coil means,
- resonant fly back switch means coupled with said deflection coil means for controlling the sweep current therethrough,
- sweep generator means for generating a substantially linear sweep signal,
- transformer means having an input responsive to a pulse wave of a predetermined frequency and an output coupled with both said fly back switch means and said sweep generator means,
- deflection coil current sampling means,
- differential means responsive to said sweep signal and said current sample means for providing an error signal, and
- means responsive to said error signal for further controlling said resonant fly back switch means for varying said deflection coil current in a manner to reduce said error signal to zero.
Dependencies are inferred from the claim text.