US 5,210,551 AGranted

Electrostatic recording apparatus with an electrode drive means within the developer circulating path

AssigneeCasio Computer Co., Ltd.

InventorsHideaki Inoue, Eiichi Takeuchi, Shigeru Shimizu, Tadao Yamamoto, Yasuhito Sato, Kenji Nakayama, Hideki Takahashi, Toshiro Honda, Kenichiro Asako

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Abstract

An electrostatic recording apparatus includes a developing agent carrying member having a surface for carrying a developing agent thereon. A plurality of recording electrodes are arranged on the surface of the developing agent carrying member in parallel to each other at a predetermined gap while being electrically insulated from each other. An electrode cylinder is arranged to oppose the plurality of recording electrodes at a predetermined gap. A developing agent convey section conveys the developing agent such that a circulating convey path is formed along the surface of the developing agent carrying member. A voltage control section outputs a control signal including recording data. A recording electrode drive section is provided inside a space defined by the circulating convey path. Upon reception of the control signal from the voltage control section, the recording electrode drive section applies a recording voltage to the plurality of recording electrodes in accordance with the recording data, and selectively transfers the developing agent conveyed by the developing agent convey section to the electrode cylinder, thereby forming a recording image.

Claims14

Dependent claims

An electrostatic recording apparatus comprising:

a fixed developing agent carrying member having a surface for carrying a developing agent thereon;
a plurality of recording electrodes arranged on the surface of said developing agent carrying member in parallel to each other at predetermined gaps, while being electrically insulated from each other;
an electrode cylinder opposing said plurality of recording electrodes at a predetermined gap;
developing agent convey means for conveying the developing agent substantially unidirectionally to said gap so as to form a circulating convey path along the surface of said developing agent carrying member;
voltage control means for outputting a control signal including recording data;
recording electrode drive means, provided inside a space defined by said circulating convey path, for applying, upon reception of the control signal from said voltage control means, a recording voltage to said plurality of recording electrodes in accordance with the recording data, thereby selectively transferring the developing agent conveyed by said developing agent convey means to said electrode cylinder, thus forming a recording image;
and
means for applying a predetermined recovery electric field on said electrode cylinder in order to recover the developing agent remaining on said recording electrodes to said electrode cylinder between a timing at which a first sheet is conveyed and a second timing at which a second sheet is conveyed.

5 more elements

An electrostatic recording apparatus comprising:

a fixed developing agent carrying member having an endless surface for carrying a developing agent thereon;
a plurality of recording electrodes arranged on the surface of said developing agent carrying member in generally parallel relation to one to the other at predetermined intervals therebetween and electrically insulated one from the other;
an electrode cylinder opposing said plurality of recording electrodes defining a predetermined gap therebetween;
developing agent conveying means housed in said developing agent carrying member for conveying said developing agent substantially unidirectionally along said surface of said developing agent carrying member to said gap;
voltage control means for outputting a control signal including recording data;
recording electrode drive means, housed in said developing agent carrying member, for applying, upon reception of the control signal from said voltage control means, a recording voltage to each of said plurality of recording electrodes in accordance with said recording data by way of connecting means located through said surface of said developing agent carrying member, thereby selectively transferring the developing agent conveyed by said developing agent conveying means to said electrode cylinder, for forming a recording image;
and
means for applying a predetermined recovery electric field on said electrode cylinder to recover any developing agent remaining on said recording electrodes to said electrode cylinder between a timing at which a first sheet is conveyed and a second timing at which a second sheet is conveyed, said recovery electric field having a pulse waveform.

5 more elements

Dependencies are inferred from the claim text.