| (19) |
 |
|
(11) |
EP 0 708 378 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
01.05.1996 Bulletin 1996/18 |
| (43) |
Date of publication A2: |
|
24.04.1996 Bulletin 1996/17 |
| (22) |
Date of filing: 29.09.1995 |
|
|
| (84) |
Designated Contracting States: |
|
DE FR GB IT |
| (30) |
Priority: |
05.10.1994 JP 264428/94
|
| (71) |
Applicant: CANON KABUSHIKI KAISHA |
|
Tokyo (JP) |
|
| (72) |
Inventors: |
|
- Baba, Yoshinobu,
c/o Canon Kabushiki Kaisha
Tokyo (JP)
- Tokunaga, Yuzo,
c/o Canon Kabushiki Kaisha
Tokyo (JP)
|
| (74) |
Representative: Beresford, Keith Denis Lewis et al |
|
BERESFORD & Co.
2-5 Warwick Court
High Holborn
London WC1R 5DJ
London WC1R 5DJ (GB) |
|
| |
|
|
|
Remarks: |
|
A request for correction of claim 30 has been filed pursuant to Rule 88 EPC. A decision
on the request will be taken during the proceedings before the Examining Division
(Guidelines for Examination in the EPO, A-V, 3.). |
|
|
|
Remarks: |
|
The first occuring claim 16 is abandoned. |
|
| (54) |
Two-component type developer, developing method and image forming method |
(57) A two-component type developer for developing an electrostatic image is constituted
by at least a toner and a magnetic carrier. The toner has a weight-average particle
size D4 of at most 10 µm and a number-average particle size D1 satisfying D4/D1 ≦
1.5. The magnetic carrier comprises composite particles comprising magnetic iron compound
particles, non-magnetic metal oxide particles, and a binder comprising a phenolic
resin. The composite particles contain the magnetic iron compound and the non-magnetic
metal oxide in a total proportion of 80 - 99 wt. %. The magnetic iron compound particles
have a number-average particle size ra, and the non-magnetic metal oxide particles
have a number-average particle size r
b satisfying r
b/r
a > 1.0.