Electron-beam generating device having plurality of cold cathode elements, method of driving said device and image forming apparatus applying same
First Claim
Patent Images
1. An electron-beam generating device comprising:
- a plurality of cold cathode elements arrayed in the form of rows and columns on a substrate;
m-number of row wires and n-number of column wires for wiring said plurality of cold cathode elements into a matrix; and
drive signal generating means for generating signals which drive said plurality of cold cathode elements, said drive signal generating means including;
statistic-quantity calculating means for performing a statistical calculation with regard to externally entered electron-beam demand values;
correction-value generating means for generating correction values on the basis of results of the calculation by said statistic-quantity calculating means;
combining means for combining the externally entered electron-beam demand values and the correction values; and
means for successively driving said matrix-wired cold cathode elements on the basis of an output value from said combining means.
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Abstract
An electron-beam generating device and a method of driving same, in which a number of cold cathode elements are matrix-wired, is applied to an image forming apparatus. Statistical calculations are performed in advance with regard to a required electron-beam output, and loss produced in the matrix wiring is analyzed. Drive signals are corrected by deciding optimum correction values based upon the analytical results. As a result, when rows of the matrix are driven successively row by row, the intensity of the outputted electron beams can made accurate for any driving pattern.
108 Citations
37 Claims
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1. An electron-beam generating device comprising:
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a plurality of cold cathode elements arrayed in the form of rows and columns on a substrate; m-number of row wires and n-number of column wires for wiring said plurality of cold cathode elements into a matrix; and drive signal generating means for generating signals which drive said plurality of cold cathode elements, said drive signal generating means including; statistic-quantity calculating means for performing a statistical calculation with regard to externally entered electron-beam demand values; correction-value generating means for generating correction values on the basis of results of the calculation by said statistic-quantity calculating means; combining means for combining the externally entered electron-beam demand values and the correction values; and means for successively driving said matrix-wired cold cathode elements on the basis of an output value from said combining means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An image forming apparatus comprising:
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an electron-beam generating device and an image forming member; said electron-beam generating device including; a plurality of cold cathode elements arrayed in the form of rows and columns on a substrate; m-number of row wires and n-number of column wires for wiring said plurality of cold cathode elements into a matrix; and drive signal generating means for generating signals which drive said plurality of cold cathode elements, with said drive signal generating means including; statistic-quantity calculating means for performing a statistical calculation with regard to externally entered electron-beam demand values; correction-value generating means for generating correction values on the basis of results of calculation by said statistic-quantity calculating means; combining means for combining the externally entered electron-beam demand values and the correction values; and means for successively driving said matrix-wired cold cathode elements on the basis of an output value from said combining means; said image forming member forming an image by irradiation with an electron beam outputted by said electron-beam generating device. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of driving an electron-beam generating device having a plurality of cold cathode elements arrayed in the form of rows and columns on a substrate, and m-number of row wires and n-number of column wires for wiring the plurality of cold cathode elements into a matrix, said method comprising:
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a drive signal generating step of generating signals which drive the plurality of cold cathode elements, with said drive signal generating step including the steps of; performing a statistical-quantity calculation with regard to externally entered electron-beam demand values; generating correction values on the basis of results of the calculation by the statistic-quantity calculating step; combining the externally entered electron-beam demand values and the correction values; and successively driving the matrix-wired cold cathode elements on the basis of an output value from the combining step. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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30. An image forming method comprising:
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a drive signal generating step of generating signals which drive a plurality of cold cathode elements, with the drive signal generating step including the steps of; performing a statistical-quantity calculation with regard to the externally entered electron-beam demand values; generating correction values on the basis of results of calculation by the statistic-quantity calculating step; combining the externally entered electron-beam demand values and the correction values; successively driving matrix-wired cold cathode elements on the basis of an output value from the combining step; and forming an image by irradiation with an electron beam outputted by the cold cathode elements. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37)
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Specification