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    • 155. 发明公开
    • MULTI-ELECTRODE ION GENERATING SYSTEM FOR ELECTROSTATIC IMAGES.
    • 带有的静电图像多个电极ION励磁系统。
    • EP0243348A4
    • 1989-07-25
    • EP85905181
    • 1985-10-15
    • DENNISON MFG CO
    • FOTLAND RICHARD A
    • B41J2/415G03G15/05G03G15/32G01D15/06
    • G03G15/323B41J2/415
    • An ion generator for the formation of electrostatic images includes two electrodes (a "control electrode" (13) and a "driver electrode" (12)) at opposite faces of a solid dielectric member (11) which are electrically actuated to form ions in an air region adjacent the control electrode (13); a third, "screen" electrode (21); and an additional, "deflection" electrode (31), which together with the screen electrode (21) modulates ion flow to an imaging surface. Ions of a given polarity attracted toward the imaging surface by an accelerating field resulting from a direct current potential of the control electrode (13). The screen electrode (21) is maintained at a screen potential (28) to control passages of ions through one or more apertures (22) therein, while a further, deflection potential (31) applied to the deflection electrode (31) provides an additional lever of control over the size, shape, and location of the resulting electrostatic images. The deflection electrode (31) may take the form of a conductive member on one side of the ion path, or two or more conductors straddling this patth. This arrangement provides an additional level of multiplexing, simplifies the requirements of electronic drive circuitry, and improves image definition.
    • 156. 发明公开
    • ELECTROSTATIC PRINTING AND COPYING.
    • 静电印刷和复印服务。
    • EP0058182A4
    • 1983-04-06
    • EP81902352
    • 1981-08-17
    • DENNISON MFG CO
    • FOTLAND RICHARD ABEAUDET LEO ABRIERE RICHARD LCARRISH JEFFREY JLENNON DONALD JVANDERVALK CASEY S
    • G03G15/05B41J2/385G01D15/06G03G15/00G03G15/16G03G15/18G03G15/20G03G15/22G03G15/32G03G15/044
    • G03G15/167G03G15/18G03G15/2092G03G15/22G03G15/323
    • An electrostatic printing device in which an electrostatic latent image is formed on an imaging or dielectric roller (25), toned, and transferred by pressure to plain paper (35). A problem which is typically encountered in transferring a toner image solely by use of pressure is the existence of a residual toner image on the dielectric member after image transfer, due to inefficiencies in toner transfer. The residual toner particles require scraper blades or other removal devices, and accumulate over time at the various process stations associated with the dielectric member, including the apparatus for forming the latent electrostatic image. These toner accumulations decrease the reliability of the apparatus, necessitating service at intervals. Furthermore, inefficiencies in toner transfer may lead to mottling of the images formed on the image receptor sheets. These problems have not been overcome in the prior art through the use of extremely high pressures at the transfer nip. Toner transfer efficiency is improved in the device of the present invention by skewing dielectric roller (25) and pressure roller (37). In the printer, the latent image is formed by an ion generator (100) using two electrodes (102-1, 102-2) that are separated by a solid dielectric (101). A varying high frequency potential (103) is used to create an air gap breakdown in a region at a junction of one of the electrodes and the solid dielectric (101). The ion generator (100) is fabricated by laminating a metal foil (174, 175) to mica (171) using pressure sensitive adhesive (172, 173), and etching the foil to form electrodes. An alternative ion generator is formed using a dielectric-coated wire (197) and a series of transverse conductors (184, 186) A preferred method of fabricating the dielectric roller involves anodizing an aluminum cylinder (25), and impregnating the surface pores with a metallic salt of a fatty acid while maintaining the pores in a substantially moisture-free state.