Title:
DEVELOPING DEVICE
Document Type and Number:
Japanese Patent JP3167060
Kind Code:
B2
Abstract:
PURPOSE: To stably obtain high-density images even without fogging even if toners of fine particles are used by specifying the rotating circumferential speed of a developing roll relative to a photosensitive body and the AC voltage to be impressed to the developing roll.
CONSTITUTION: The negatively charged one-component toners T having 4.0 to 7.0μm average grain size are supplied as the one-component developer in a developing device to the developing roll 6 by rotation of an agitating member 20 and are transported according to the rotation of the developing roll 6. On the other hand, the photosensitive drum 2 and the developing roll 6 faces each other apart a min. spacing SD=300μm in the nearest part. Non-contact development is executed by impressing an AC bias of interpeak voltage Vpp=1200V and frequency f=1800Hz superposed with DC to the developing roll 6 at the time of forming the images. The relation between the interpeak voltage Vpp, the frequency f and the min. spacing SD is so set as to satisfy Vpp/SD<1.5+(f/600) and the circumferential speed of the developing roll 6 relative to the photosensitive drum 2 is set in a 1.25 to 2.5 times range.
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Inventors:
Keiji Okano
Masanobu Saito
Yasushi Shimizu
Masahiro Yoshida
Akira Domon
Hiroyuki Adachi
Masanobu Saito
Yasushi Shimizu
Masahiro Yoshida
Akira Domon
Hiroyuki Adachi
Application Number:
JP10103193A
Publication Date:
May 14, 2001
Filing Date:
April 27, 1993
Export Citation:
Assignee:
Canon Inc
International Classes:
G03G15/06; G03G13/08; G03G15/08; G03G15/09; (IPC1-7): G03G15/08; G03G15/06
Domestic Patent References:
| JP264556A | ||||
| JP1221757A | ||||
| JP566673A | ||||
| JP553435A | ||||
| JP4271376A | ||||
| JP4204572A |
Attorney, Agent or Firm:
Keizo Nishiyama (1 person outside)