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Copier using magnetic brush and semiconducting toner - induces charge in drum for image development but kept from toner particles by insulation on brush
Copier using magnetic brush and semiconducting toner - induces charge in drum for image development but kept from toner particles by insulation on brush
The copier uses a magnetic brush and semiconducting toner. The brush is covered with an insulating coating (7) with a resistance of at least 103 (pref. 105) ohm/cm2. When the electrostatic image is developed, a charge is induced in the drum (8) by the magnetic brush, but due to the insulation (7) not in the conducting or semi-conducting toner particles, which are thus less liable to adhere to the uncharged image areas. The corona discharge transferring the toner to paper has its lines of force more upright; its voltage does not vary by more than 3000 (pref. 2000) V nor oscillate more than 50 times while a point of the paper passes. The toner particles are ellipsoidal with dia. 3-20 (pref. 7-15)u.
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