| 摘要 |
An apparatus for controlling the transmission density of a layer of pigmented thermoplastic marking particles (e.g., electrographic toner) being deposited on a dielectric film or layer by an electrically biased particle applicator. Such apparatus uses (a) an electrometer for producing a first signal proportional to the level of electrostatic charge on the film after such particles have been applied thereto; (b) a charge-to-mass determining device for producing a second signal proportional to the electrostatic charge-to-mass ratio of the particles applied to the film surface; and (c) a bias voltage controller responsive to the first and second signals for controlling the electrical bias on the particle applicator to control the mass per unit area of the particles applied to the film surface.
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