Photocopying – Contact printing – Light boxes
Patent
1992-10-23
1996-06-04
Braun, Fred L.
Photocopying
Contact printing
Light boxes
355221, G03G 1504, G03G 2100
Patent
active
055238343
ABSTRACT:
An image forming apparatus includes an image forming device for forming an image on a recording material, the image forming device having a contactable member which is contactable with the recording material with electrostatic attraction force between the contactable member and the recording material; a separation discharger for electrically discharging the recording material upon separation of the recording material from the contactable member after image formation on the recording material, the separation discharger having a wire electrode and a shield electrode; wherein Vp/f.ltoreq.0.5 is satisfied where Vp is a conveying speed of the recording material (mm/sec), and f is a frequency of a periodically changing voltage applied to the separation discharger (Hz), wherein the inside of the shield electrode is reduced toward the contactable member.
REFERENCES:
patent: 3620615 (1971-11-01), Volkers
patent: 4239373 (1980-12-01), Weikel
patent: 4286862 (1981-09-01), Akita et al.
patent: 4480909 (1984-11-01), Tsuchiya
patent: 4533618 (1985-08-01), Nishihama et al.
patent: 4688927 (1987-08-01), Oda et al.
patent: 4979000 (1990-12-01), Hamada et al.
Braun Fred L.
Canon Kabushiki Kaisha
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