Device for electrically charging particles
OwnerSenichi Masudainventor
Life of this patent
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Abstract
In a device for electrically charging particles, a pair of parallel plasma generators are spaced from one another, each of the generators having corona discharge electrodes. A main field forming source of high AC voltage is connected between the plasma generators, to form a main field in the charging space, and intermittently operating corona generating high voltage power sources are coupled to apply high voltages to the respective corona discharge electrodes only when the plasma generators have relative specific polarity, whereby only particles of one polarity are driven into the charging space. The intermittent corona generating high voltage source has a frequency equal to or greater than the frequency of the AC voltage which provides the main AC field.
Claims9
In a device for electrically charging particles, comprising two or more parallel plane plasma generating means opposite to one another at a determined distance and provided with corona discharge electrodes for charging particles in the intervening space, corona generating high voltage power sources coupled to apply a high voltage alternately to the corona discharge electrodes of said respective plane plasma generating means, for generating corona discharge, and a main field forming AC high voltage power source connected to apply a high AC voltage between the opposing plane plasma generating means, for forming a main AC field in the charging space;
- the improvement wherein said corona generating high voltage power sources comprise intermittently operative power sources for supplying intermittent high voltages of a frequency at least equal to that of said main field, said corona generating high voltage power sources applying high voltages to the respective plasma generating means to produce corona discharge for thereby generating plasma only when the plane plasma generating means have specific relative polarities, whereby unipolar ions of said polarity are alternately emitted from opposing plane plasma generating means to the charging space therebetween, for charging particles introduced into said space.
In a device for electrically charging particles, comprising a pair of parallel plane plasma generators spaced apart from one another to define a particle charging space, each generator including first electrode means for producing a main field in said space, and corona discharge electrodes, a source of high voltage AC connected between said first electrodes, and corona generating high voltage source means coupled to apply high voltages between each first electrode and the respective corona discharge electrodes;
- the improvement wherein said corona generating high voltage source means comprise means responsive to a determined polarity of high voltage between the respective first electrode and the other generator for intermittently applying a high voltage to the respective corona discharge electrode for producing corona discharge at a frequency at least equal to the frequency of the field in said charging space, whereby only ions of one polarity are driven into said space.
Dependencies are inferred from the claim text.