(19)
(11) EP 0 625 730 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.01.1995 Bulletin 1995/02

(43) Date of publication A2:
23.11.1994 Bulletin 1994/47

(21) Application number: 94107101.1

(22) Date of filing: 06.05.1994
(51) International Patent Classification (IPC)5G03G 15/01, G03G 15/04
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 20.05.1993 US 65246
20.05.1993 US 65248

(71) Applicant: EASTMAN KODAK COMPANY
Rochester, New York 14650-2201 (US)

(72) Inventors:
  • Guth, Joseph Edward, c/o Eastman Kodak Company
    Rochester, New York 14650-2201 (US)
  • Kasiske, W. Charles, c/o Eastman Kodak Company
    Rochester, New York 14650-2201 (US)
  • Stelter, Eric Carl, c/o Eastman Kodak Company
    Rochester, New York 14650-2201 (US)
  • Ng, Yee Seung, c/o Eastman Kodak Company
    Rochester, New York 14650-2201 (US)
  • Koetter, Frank Joseph, c/o Eastman Kodak Company
    Rochester, New York 14650-2201 (US)

(74) Representative: Blickle, K. Werner, Dipl.-Ing. et al
KODAK AKTIENGESELLSCHAFT Patentabteilung
70323 Stuttgart
70323 Stuttgart (DE)


(56) References cited: : 
   
       


    (54) Method and apparatus for forming two toner images in a single frame


    (57) A composite toner image made up of first and second toners is formed on an image member (1). A first electrostatic image of a first polarity is formed on the image member (1). That electrostatic image is toned with a first toner of the first polarity. The image member (1) is imagewise exposed to create a second electrostatic image also of the first polarity. Exposure is overlapped into the portion of the image member (1) under the first toner image to prevent any charge on the photoconductor of the first polarity underneath the first toner image from repelling toner into the portions of the second electrostatic image that are discharged. Preferably, the second exposure is accomplished through the base (3) of the image member in order to thoroughly expose portions of the electrostatic image underneath the first toner image. A web image member (1) is conveniently exposed through its base (3) by a printhead (17) mounted in an assembly (50) including a positioning bar (70) for properly spacing the printhead (17) and a lens 54 from the image member 1.







    Search report