Image forming apparatus

Details Image forming apparatus Image forming apparatus

2006-07-04

2006-07-04

Tran, Huan (Department: 2861)

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

C347S140000, C399S136000, C399S153000

Reexamination Certificate

active

07071960

ABSTRACT:
Electron generating devices and LED arrays are arranged in a surrounding area of a photosensitive drum. The electron generating devices are located downstream of a cleaner and upstream of a developing unit with respect to a turning direction of the photosensitive drum with a specific gap between the electron generating devices and a surface of the photosensitive drum. The LED arrays are disposed against outer ends of the electron generating devices opposite to inner ends thereof facing the photosensitive drum. When activated by a driving circuit according to image information, individual LED elements of the LED arrays emit light, causing the electron generating devices to emit electrons in a pattern corresponding to the image information. The electrons emitted from the electron generating devices produce more electrons due to an electron avalanche phenomenon before reaching the photosensitive drum, eventually forming an electrostatic latent image on the surface of the photosensitive drum.

REFERENCES:
patent: 5565963 (1996-10-01), Tsujita et al.
patent: H05-040381 (1993-02-01), None
patent: H08-248648 (1996-09-01), None
patent: 2001-109235 (2001-04-01), None
Kidaka, et al., Direct Formation of Electrostatic Latent Image by Means of Photoelectric Emission, Journal of the Institute of Electrostatics Japan, Jun. 1999, pp. 146-147, 23-3, the Institute of Electrostatics Japan, Tokyo Japan.

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