Photocopying – Contact printing – Light boxes
Patent
1994-09-14
1996-08-20
Brase, Sandra L.
Photocopying
Contact printing
Light boxes
355208, 355215, G03G 1506
Patent
active
055483810
ABSTRACT:
A developing apparatus includes a toner carrying member, disposed opposite an image bearing member for bearing an electrostatic image, for carrying toner to the image bearing member; an electric field forming device for forming an alternating electric field between the image bearing member and the toner carrying member, wherein the alternating electric field includes a first phase in which a constant electric field for urging the toner from said image bearing member toward said toner carrying member continues for a predetermined period, a second phase in which a constant electric field for urging the toner from said toner carrying member toward said image bearing member continues for a predetermined period, and a third phase in which the electric field gradually changes from that in the first phase to that in the second phase within a predetermined period .DELTA.T, and a controller for changing a ratio (.DELTA.T/T), where T is one period of the alternating electric field.
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Enomoto Naoki
Fujii Haruo
Hayakawa Tatsuhiko
Kobayashi Tatsuya
Kobayashi Tetsuya
Brase Sandra L.
Canon Kabushiki Kaisha
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