Coating apparatus – With means to apply electrical and/or radiant energy to work... – With means to orient coating particles
Patent
1977-04-01
1978-12-26
Schroeder, Werner H.
Coating apparatus
With means to apply electrical and/or radiant energy to work...
With means to orient coating particles
118 9, G03G 1509
Patent
active
041310810
ABSTRACT:
A toner concentration detecting apparatus is disclosed wherein developing powder including magnetic carrier and pigmented toner is carried on a magnet roller and transported thereby to a surface of a photosensitive drum, and after development a portion of the developing powder is removed off the surface of the magnet roller and passed through a detection coil to determine a concentration of the toner in the developing powder based on a magnitude of an inductance of the detection coil. Accuracy of detection is enhanced by magnetizing the developing powder into chain at areas upstream and downstream of the detection coil and demagnetizing the developing powder within the detection coil. By magnetizing the developing powder into chain upstream and downstream of the detection coil, the stream of developing powder within the detection coil is stabilized and the variation of the developing powder density within the detection coil is minimized.
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Falik Andrew M.
Hitachi , Ltd.
Schroeder Werner H.
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