Liquid developer and developing method and developing apparatus using same
AssigneeMinolta Co., Ltd.
InventorsHidetoshi Miyamoto, Toshimitsu Fujiwara, Shuji Iino
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Abstract
A liquid developer for developing an electrostatic latent image having a carrier fluid and electrically charged toner particles dispersed therein, wherein the liquid developer satisfies the following relationship: 25.0.gtoreq.V.sub.0 /.DELTA.V.sub.10 .gtoreq.1.5 wherein V.sub.0 denotes surface potential of a toner particle layer electrically deposited on a conductive substrate by applying bias voltage between the substrate and an electrode confronting with the substrate, and .DELTA.V.sub.10 denotes change of the surface potential decaying for 10 seconds after shutting off the bias voltage.
Claims16
A liquid developer for developing an electrostatic latent image comprising a carrier fluid and electrically charged toner particles dispersed therein, wherein said liquid developer satisfies the following relationship:
- 25.0.gtoreq.V.sub.0 /.DELTA.V.sub.10 .gtoreq.1.5
- wherein V.sub.0 denotes surface potential of a toner particle layer electrically deposited on a conductive substrate by applying bias voltage between said substrate and an electrode confronting said substrate, and .DELTA.V.sub.10 denotes change of the surface potential decaying for 10 seconds after shutting off the bias voltage.
A developing device comprising:
- (a) a conductive member which carries a liquid developer on the surface thereof and contacts the developer to an electrostatic latent image carrying member;
- (b) an electrode which confronts said conductive member;
- (c) a developer supplier which supplies a liquid developer to a confrontation area between said conductive member and said electrode, wherein said liquid developer comprises a carrier fluid and electrically charged toner particles dispersed therein, and satisfies the following relationship:
- 25.0.gtoreq.V.sub.0 /.DELTA.V.sub.10 .gtoreq.1.5
- wherein V.sub.0 denotes surface potential of a toner particle layer electrically deposited on said conductive member by applying bias voltage between said conductive member and said electrode, and .DELTA.V.sub.10 denotes change of the surface potential decaying for 10 seconds after shutting off the bias voltage;
- and
- (d) an electric power source which applies bias voltage between said conductive member and said electrode so as to deposit toner particles contained in a liquid developer on the conductive member.
A method for developing an electrostatic latent image comprising steps of:
- (a) providing a liquid developer to confrontation between a conductive member and an electrode, wherein said liquid developer comprises a carrier fluid and electrically charged toner particles dispersed therein;
- (b) applying bias voltage between said conductive member and said electrode so as to deposit toner particles contained in the developer on the conductive member, wherein said liquid developer satisfies the following relationship:
- 25.0.gtoreq.V.sub.0 /.DELTA.V.sub.10 .gtoreq.1.5
- wherein V.sub.0 denotes surface potential of a toner particle layer electrically deposited on said conductive member and .DELTA.V.sub.10 denotes change of the surface potential decaying for 10 seconds after shutting off the bias voltage;
- and
- (c) contacting the developer existing on the conductive member to an electrostatic latent image after applying bias voltage.
Dependencies are inferred from the claim text.