Developing method and apparatus
United States Patent [191
[11] [45]
Hayashi et a1. [54] DEVELOPING METHOD AND APPARATUS
[56]
[75] Inventors: Nobuhiro Hayashi, Yokohama; Kimio Nakahata, Kawasaki; Hatsuo
Sep. 9, 1986
Tajima ...................... .. 355/3 DD X Tashiro .... ..
4,482,243 11/1984 Suzuki et a1.
[73] Assignee: Canon Kabushiki Kaisha, Tokyo, Japan
4,496,644
1/1985
Ateya et a1.
4,511,240
4/1935
Suzuki et al. ............... .. 355/14 E X
..
Primary Examiner—A. C. Prescott
Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &
[21] Appl. No.: 644,560
Scinto
[57]
Aug. 27, 1984
ABSTRACT
A method of development including the steps of form
Foreign Application Priority Data
Sep. 5, 1983 [JP] Sep. 5, 1983 [JP] Dec. 22, 1983 [JP]
5/1983
4,478,505 10/ 1984
Kawasaki, all of Japan
[30]
4,610,531
References Cited U.S. PATENT DOCUMENTS 4,383,497
Tajima, Matsudo; Shunji Nakamura,
[22] Filed:
Patent Number: Date of Patent:
ing a thin layer of developer on a surface of a developer
carrying member; opposing the surface of the developer
Japan .............................. .. 58-162803 Japan .............................. .. 58-162804 Japan .............................. .. 58-243446
carrying member to a latent image bearing member bearing a latent image to be developed with a clearance
[51]
Int. Cl.4 ........................................... .. G03G 15/08
therebetween which is larger than the thickness of the thin developer layer at a developing position; and inter
[52]
US. Cl. ........................... .. 355/14 D; 355/3 DD;
mittently forming an alternating electric ?eld, as a de
118/657; 430/35; 430/122 [58]
veloping bias, across the clearance.
Field of Search .............. .. 355/3 DD, 14 D, 3 R,
355/14 R; 430/35, 120, 122; 118/653, 657
18 Claims, 15 Drawing Figures
5 1'6 E 9
500
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TIME (m SEC) - 500‘
US. Patent Sep.9,1986
Sheetl oflO
4,610,531
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O
500
IMAGE POTENTIAL (V)
FIG. I
US. Patent
Sep.9, 1986
'
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4,610,531
FIG.2
US. Patent Sep.9, 1986
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TIME (m SEC)
US. Patent Sep.9, 1986 U1 0 O
Sheet 5 oflO
4,610,531
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TIME(m SEC)
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FIG. 7
TlME(m SEC)
US. Patent Sep. 9, 1986
Sheet 6 of 10
4,610,531
00-’
O
M: M TIME (m SEC)
FIGS
0
2; TlME(m sec)
-3
..
-5
..
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FIG.9
US. Patent Sep. 9, 1986
Sheet 7 of 10
I60
4,610,531
260
SLEEVE LENGTH (mm)
FIG. I0
5 00
TIME(mSEC)
FIG. I2
300
US. Patent Sep. 9, 1986
Sheet8 OflO
4,610,531
FIG.
U. S. Patent Sep. 9, 1986 L
Sheet 9 of 10
4,610,531
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3500LL]
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FIG. l4
U.S. Patent Sep. 9,1986
A
Sheet 10 01-‘10 4,610,531
A
2 E9’ 500
'_J
[11] [45]
Hayashi et a1. [54] DEVELOPING METHOD AND APPARATUS
[56]
[75] Inventors: Nobuhiro Hayashi, Yokohama; Kimio Nakahata, Kawasaki; Hatsuo
Sep. 9, 1986
Tajima ...................... .. 355/3 DD X Tashiro .... ..
4,482,243 11/1984 Suzuki et a1.
[73] Assignee: Canon Kabushiki Kaisha, Tokyo, Japan
4,496,644
1/1985
Ateya et a1.
4,511,240
4/1935
Suzuki et al. ............... .. 355/14 E X
..
Primary Examiner—A. C. Prescott
Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &
[21] Appl. No.: 644,560
Scinto
[57]
Aug. 27, 1984
ABSTRACT
A method of development including the steps of form
Foreign Application Priority Data
Sep. 5, 1983 [JP] Sep. 5, 1983 [JP] Dec. 22, 1983 [JP]
5/1983
4,478,505 10/ 1984
Kawasaki, all of Japan
[30]
4,610,531
References Cited U.S. PATENT DOCUMENTS 4,383,497
Tajima, Matsudo; Shunji Nakamura,
[22] Filed:
Patent Number: Date of Patent:
ing a thin layer of developer on a surface of a developer
carrying member; opposing the surface of the developer
Japan .............................. .. 58-162803 Japan .............................. .. 58-162804 Japan .............................. .. 58-243446
carrying member to a latent image bearing member bearing a latent image to be developed with a clearance
[51]
Int. Cl.4 ........................................... .. G03G 15/08
therebetween which is larger than the thickness of the thin developer layer at a developing position; and inter
[52]
US. Cl. ........................... .. 355/14 D; 355/3 DD;
mittently forming an alternating electric ?eld, as a de
118/657; 430/35; 430/122 [58]
veloping bias, across the clearance.
Field of Search .............. .. 355/3 DD, 14 D, 3 R,
355/14 R; 430/35, 120, 122; 118/653, 657
18 Claims, 15 Drawing Figures
5 1'6 E 9
500
_l
1oo.__ __l_________ o
1
é
__I_____ 4
TIME (m SEC) - 500‘
US. Patent Sep.9,1986
Sheetl oflO
4,610,531
(IDMENASGI)TEY '0: o o.
O
500
IMAGE POTENTIAL (V)
FIG. I
US. Patent
Sep.9, 1986
'
SheetZoflO
4,610,531
FIG.2
US. Patent Sep.9, 1986
Sheet4of10
O 5m
O0
n m
_
o
_
_
_
_
_
_
_
_
_
_
_
_
_
Flt
-500-
FIG.5
_
_
_
_
_
F
_
4,610,531
_
TIME (m SEC)
US. Patent Sep.9, 1986 U1 0 O
Sheet 5 oflO
4,610,531
E
(VOLTA)GE O
2
\
TIME(m SEC)
-350 '
~5OO
-lOOO-'
500
(VOLTA)GE 2
-lOOO-
FIG. 7
TlME(m SEC)
US. Patent Sep. 9, 1986
Sheet 6 of 10
4,610,531
00-’
O
M: M TIME (m SEC)
FIGS
0
2; TlME(m sec)
-3
..
-5
..
"IOOO“
FIG.9
US. Patent Sep. 9, 1986
Sheet 7 of 10
I60
4,610,531
260
SLEEVE LENGTH (mm)
FIG. I0
5 00
TIME(mSEC)
FIG. I2
300
US. Patent Sep. 9, 1986
Sheet8 OflO
4,610,531
FIG.
U. S. Patent Sep. 9, 1986 L
Sheet 9 of 10
4,610,531
v
3500LL]
2 5
.
I
2
7
8
9
TIME(mSEC)
-5oo--w
'>‘ "500LU
2
8.00
>
O
’
r. I
,
I ll
L l2
I
_
l3
TlME(mSEC) -5oo
FIG. l4
U.S. Patent Sep. 9,1986
A
Sheet 10 01-‘10 4,610,531
A
2 E9’ 500
'_J
