Destaticizing device in electrophotographic copier


PURPOSE:To prevent occurrence of dark developed portion in the periphery of the image of subject, by disposing a plurality of destaticizing lamps in the widthwise direction of photoreceptor, controlling the illumination according to the copy size, and destaticizing the both side regions and front and rear regions of the effective image region of the photoreceptor. CONSTITUTION:A destaticizing device consists of a plurality of lamps L1 to L7 which are provided in a lamp casing 20 of which length is nearly equal to the image effective width of a photoreceptor. Lamps are disposed in accordance with copy sizes on the photoreceptor surface, and are partitioned by light shielding walls 23 to 26, so that the light interference among lamps is prevented. The number of lamps and the illumination thereof are determined in relation to the copy size, distance between the destaticizing device and the photoreceptor surface, and other factors. In the case of width W1 of the effeftive image region, all lamps are lit for the period of A-A1, and B1-B. In the case of width W2 of the effective image region, lamps L1 and L7 are illuminated for the period of A-B in both end regions to destaticize, while lamps L2 to L6 are illuminated for the period of A-A2 and B2-B in the front and rear regions.




Download Full PDF Version (Non-Commercial Use)

Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    JP-S4926590-AMarch 09, 1974
    JP-S5236018-AMarch 19, 1977Fuji Photo Film Co LtdMagnetic tape cassette

NO-Patent Citations (0)


Cited By (12)

    Publication numberPublication dateAssigneeTitle
    JP-S54125031-ASeptember 28, 1979Ricoh Co LtdErasion method for unnecessary static latent image region
    JP-S57102667-AJune 25, 1982Minolta Camera Co LtdControl unit of electronic copying machine
    JP-S578554-AJanuary 16, 1982Ricoh Co LtdMethod for forming image with copying machine
    JP-S5878169-AMay 11, 1983Seiko Epson CorpOptical imaging device
    JP-S5888666-UJune 16, 1983
    JP-S59176754-AOctober 06, 1984Fuji Xerox Co LtdReversal developing method of electrophotographic copying machine
    JP-S592058-AJanuary 07, 1984Ricoh Co LtdMethod for making patterned image for controlling image density in electrophotographic copying machine
    JP-S61177474-AAugust 09, 1986Canon IncLighting device
    JP-S61177476-AAugust 09, 1986Canon IncLighting device
    JP-S62201765-UDecember 23, 1987
    JP-S63104069-AMay 09, 1988Fuji Xerox Co LtdCopying machine
    JP-S63159886-AJuly 02, 1988Fuji Xerox Co LtdElectrostatic discharging device for copying machine