Global Patent Index - EP 0395448 A3

EP 0395448 A3 19910821 - ELECTROSTATIC PRINT HEAD

Title (en)

ELECTROSTATIC PRINT HEAD

Publication

EP 0395448 A3 19910821 (EN)

Application

EP 90304653 A 19900427

Priority

US 34515289 A 19890428

Abstract (en)

[origin: EP0395448A2] Each of the plurality of styli contained in an electrostatic print head (101, 102, 103, 104) and used for placing an electrostatic charge on a dielectric coated medium has a rectangular cross section. The thickness of the cross section is selected such that the difference between the lowest voltage on the stylus at which the amount of electrical charge deposited on the dielectric medium for any increase in voltage on the stylus increases substantially in a linear fashion and the lowest voltage on the stylus at which an unwanted background image is formed on the medium is selected to have a value equal to or less than a selected number. The thickness can be selected to minimize this difference ot to ensure that the electrostatic print head (101, 102, 103, 104) performs for some minimum lifetime or to ensure that the distance (d) between adjacent styli in the print head is selected such that current flowing from a stylus having a print voltage applied thereto to a directly adjacent stylus with a lower voltage applied thereto is below a selected number.

IPC 1-7

G03G 15/044; B41J 2/395

IPC 8 full level

B41J 2/395 (2006.01); G01D 15/06 (2006.01); G03G 15/32 (2006.01)

CPC (source: EP)

B41J 2/395 (2013.01); G03G 15/325 (2013.01)

Citation (search report)

  • [Y] US 4588997 A 19860513 - TUAN HSING C [US], et al
  • [Y] US 3958251 A 19760518 - BORELLI RONALD F
  • [X] US 3946403 A 19760323 - IKEUCHI JUN-ICHIRO, et al
  • [Y] US 2919171 A 19591229 - HERMAN EPSTEIN, et al
  • [Y] US 2918580 A 19591222 - HOWELL RICHARD S
  • PATENT ABSTRACTS OF JAPAN, vol. 6, no. 171 (P-140)[1049], 4th September 1982; & JP,A,57 089 775 (MITSUBISHI) 04-06-1982
  • PATENT ABSTRACTS OF JAPAN, vol. 5, no. 190 (M-100)[862], 4th December 1981; & JP,A,56 111 679 (MITSUBISHI) 03-09-1981
  • PATENT ABSTRACTS OF JAPAN, vol. 12, no. 27 (M-662)[2874], 27th January 1988; & JP,A,62 181 161 (CANON INC.) 08-08-1987

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0395448 A2 19901031; EP 0395448 A3 19910821; JP H0367667 A 19910322

DOCDB simple family (application)

EP 90304653 A 19900427; JP 11187290 A 19900501