| 摘要 |
PURPOSE:To measure the particle size distribution and the charge quantity distribution of toner particle units with a high precision by gathering toner particles of low natural drop speed onto the surface of a filter easily. CONSTITUTION:Electrodes 1 and 2 are provided in parallel with the Z direction, and air alminar streams in Y and X directions are formed in the electric field which is formed by applying a certain DC voltages to these electrodes. Charged toner particles 4 are dispersed in particle units and are dropped naturally from a toner drop tube 3 provided above the position between electrodes 1 and 2. Particles 4 are moved with a certain speed component in the X direction by air alminar streams and are gathered on a filter 7. Toner particles receive the force of the electric field in the Y direction and the gravity in the Z direction to move with components in individual directions while moving in the X direction. Displacements in Y and X directions of particles 4 are proportional to the square of the particle size and the charge quantity per unit particle size. Thus, the particle size and the charge quantity of particles 4 are obtained inversely in accordance with YZ coordinates of particles 4 gathered on the filter 7.
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