(19)
(11) EP 0 601 801 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.09.1995 Bulletin 1995/37

(43) Date of publication A2:
15.06.1994 Bulletin 1994/24

(21) Application number: 93309687.7

(22) Date of filing: 03.12.1993
(51) International Patent Classification (IPC)5: G03G 15/01, G03G 15/00
(84) Designated Contracting States:
DE FR GB

(30) Priority: 07.12.1992 US 986400

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

(72) Inventor:
  • Scheuer, Mark A.
    Williamson, New York 14589 (US)

(74) Representative: Hill, Cecilia Ann et al
Rank Xerox Ltd Patent Department Parkway
Marlow Buckinghamshire SL7 1YL
Marlow Buckinghamshire SL7 1YL (GB)


(56) References cited: : 
   
       


    (54) Maintaining precise electrostatic control using two esvs


    (57) Erroneous voltage readings of Electrostatic Voltmeters (ESVs), which have become contaminated by charged particles (i.e. toner) from developer housings (58,60) used for developing latent images on a photoreceptor surface (10), are negated by adjusting the readings of the ESVs (ESV₁,ESV₂) to compensate for the contamination of the ESVs. Additionally, the developer housing biases (70,71) are adjusted by an amount equal to the difference between the voltages measured by the ESVs thereby insuring proper development and cleaning fields during development.






    Search report