(19)
(11) EP 0 488 792 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.08.1993 Bulletin 1993/34

(43) Date of publication A2:
03.06.1992 Bulletin 1992/23

(21) Application number: 91311125.8

(22) Date of filing: 29.11.1991
(51) International Patent Classification (IPC)5: G03G 15/01
(84) Designated Contracting States:
DE FR GB

(30) Priority: 29.11.1990 US 619561

(71) Applicant: XEROX CORPORATION
Rochester New York 14644 (US)

(72) Inventor:
  • O'Brien, John F.
    Penfield, New York 14526 (US)

(74) Representative: Johnson, Reginald George et al
Rank Xerox Ltd Patent Department Parkway
Marlow Buckinghamshire SL7 1YL
Marlow Buckinghamshire SL7 1YL (GB)


(56) References cited: : 
   
       


    (54) A method and apparatus for printing color images


    (57) A plurality of color images are formed on a predetermined area of a uniformly charged image receiver (12) using a plurality of ionographic printing heads (22, 24, 26, 28). Formation of the first image is effected by selectively discharging the predetermined area with subsequent development thereof with a toner of a first color. Subsequent to image development the image receiver (12) is recharged to the uniform charge level. The foregoing process is repeated for each different color toner used. In the case of the last developed image the recharging step is omitted. By using ionographic imaging devices (22, 24, 26, 28) for forming the images, the printer disclosed herein is not limited to using toners which are transparent to electromagnetic radiation.






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