G - Physics – 03 – G
Patent
G - Physics
03
G
314/7
G03G 15/09 (2006.01) G03G 15/08 (2006.01)
Patent
CA 1200274
METHOD AND APPARATUS FOR CONTROLLING THE THICKNESS OF DEVELOPER ON AN APPLICATOR, SUCH AS A MAGNETIC BRUSH, IN ELECTROSTATIC REPRODUCTION ABSTRACT A magnetic brush developing system for electro- static duplication using a monocomponent developer con- trols the thickness of the developer on the brush such that the necessary amount of developer is applied to the photosensitive surface which carries the latent electro- static image. A capacitive sensor in the form of a rigid plate of conductive material is spaced closely adjacent to the surface of the roll on which the mag- netic brush is formed. The dielectric constant depends on the thickness of the developer in the magnetic brush and is detected by the capacitive sensor. The capaci- tance of the sensor is converted, into a pulse train the duty cycle of which is modulated in accordance with the change in capacitance, by a circuit arranged on a cir- cuit board in close proximity to the sensor to provide a compact structure which is not subject to perturbations which could effect the capacitance presented by the sensor. The circuit controls the supply of developer to the brush in response to the duty cycle of the pulse train by causing the dispensing of the developer when a duty cycle change corresponding to the decrease in the thickness of the developer in the brush occurs and ter- minating the dispensing of the developer when the thick- ness becomes excessive thereby providing a layer of developer of consistent thickness in the brush so that copies of desirable optical density are obtained.
442500
Cappon Douglas W.
Fagen Ben W. Jr.
Borden Ladner Gervais Llp
Magnetic Technologies Corporation
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