Patent US3974665A successfully refreshed from Google Patents.
US5450180A
Expired / Lapsed
US
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Image forming apparatus having constant current and voltage control in the charging and transfer regions
Assignee: Canon Inc
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Filing: 1994-05-09
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Granted: 1995-09-12
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Expires: 2014-05-09
Abstract
Abstract An image forming apparatus includes a movable image bearing member; an image forming device for forming an image on the image bearing member; a charging member disposed opposed to the image bearing member; and bias application device for applying a bias voltage to the charging member, wherein the bias applying device effects a constant voltage control to the charging member when an image area of the image bearing member is in a charging region of the charging member, and effects a constant current control during at least a part of a period in which an area of the image bearing member other than the image area is in the charging region, and wherein a level of a constant voltage of the constant voltage control is determined during the constant current control.
Inventors
- 👤 Yukihiro Ohzeki
- 👤 Koichi Hiroshima
- 👤 Junji Araya
- 👤 Yasushi Sato
- 👤 Toshio Miyamoto
- 👤 Kimio Nakahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167; G03G15/1675
Claims Analysis
Total Claims: 99
Claim 1
Independent Claim
169 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; a charging member disposed opposing said image bearing member; and bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level thereto when an image area of said image bearing member is in a charging region of said charging member, and effects a constant current control by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which an area of said image bearing member other than the image area is in the charging region, and wherein a level of a constant voltage of the constant voltage control is determined during the constant current control.
Claim 2
Dependent Claim
169 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; a charging member disposed opposing said image bearing member; and bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level thereto when an image area of said image bearing member is in a charging region of said charging member, and effects a constant current control by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which an area of said image bearing member other than the image area is in the charging region, and wherein a level of a constant voltage of the constant voltage control is determined during the constant current control.
Claim 3
Dependent Claim
17 words
An apparatus according to claim 1, wherein said charging member is contactable to said image bearing member.
Claim 4
Dependent Claim
59 words
An apparatus according to claim 1, wherein the image on said image bearing member is transferred onto a transfer material by passing the transfer material between said image bearing member and said charging member so that the transfer material is contacted to a surface of said image bearing member on which the image is formed, in the charging region.
Claim 5
Dependent Claim
36 words
An apparatus according to claim 1, wherein said image forming means includes latent image forming means for forming a latent image on said image bearing member and developing means for developing the latent image with toner.
Claim 6
Dependent Claim
30 words
An apparatus according to claim 4, wherein the image area of said image bearing member is an area in which a toner image is formed on said image bearing member.
Claim 7
Dependent Claim
25 words
An apparatus according to claim 3, wherein the image area of said image bearing member is an area which is contacted to the transfer material.
Claim 8
Dependent Claim
35 words
An apparatus according to claim 1, wherein the area other than the image area is on upstream and downstream sides of the image area with respect to a movement direction of said image bearing member.
Claim 9
Dependent Claim
23 words
An apparatus according to claim 3, wherein the period includes a period in which the transfer material is not in the charging region.
Claim 10
Dependent Claim
25 words
An apparatus according to claim 1, wherein the period includes a period in which said image bearing member is moved before the image is produced.
Claim 11
Dependent Claim
35 words
An apparatus according to claim 1, wherein the area other than the image area includes an area between the image region and a next image region during continuous image formation on said image bearing member.
Claim 12
Dependent Claim
37 words
An apparatus according to claim 1, wherein the constant current control is effected before the image is produced, and the constant voltage control is effected until a predetermined number of the image areas reach the charging region.
Claim 13
Dependent Claim
30 words
An apparatus according to claim 11, wherein when a predetermined number of image areas pass through the charging region, the constant current control is effected, and the operation is repeated.
Claim 14
Dependent Claim
17 words
An apparatus according to claim 2, wherein said charging member is in the form of a roller.
Claim 15
Dependent Claim
17 words
An apparatus according to claim 2, wherein said charging member is in the form of a belt.
Claim 16
Dependent Claim
21 words
An apparatus according to claim 4, wherein said latent image forming means includes charging means for charging said image bearing member.
Claim 17
Dependent Claim
36 words
An image forming apparatus according to claim 15, wherein said charging means includes a second charging member and second bias voltage applying means having the same structure as said charging member and bias applying means, respectively.
Claim 18
Dependent Claim
59 words
An apparatus according to claim 15, wherein the image on said image bearing member is transferred onto a transfer material by passing the transfer material between said image bearing member and said charging member so that the transfer material is contacted to the surface of said image bearing member on which the image is formed, in the charging region.
Claim 19
Dependent Claim
43 words
An apparatus according to claim 17, wherein said image bearing member is a photosensitive member, and said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information.
Claim 20
Dependent Claim
43 words
An apparatus according to claim 17, wherein prior to the latent image being formed on said image bearing member, said charging means charges an area of said image bearing member which is to be in the charging region during the constant current control.
Claim 21
Dependent Claim
33 words
An apparatus according to claim 17 or 19, wherein said developing means develops the latent image with toner having a polarity which is the same as the charging polarity of said charging means.
Claim 22
Dependent Claim
43 words
An apparatus according to claim 20, wherein said image bearing member is a photosensitive member, and said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information.
Claim 23
Dependent Claim
82 words
An apparatus according to claim 15, wherein said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information, and wherein said exposure means exposes to light at least a part of an area other than the image area of said image bearing member, and the exposed area is different from the area of said image bearing member in the charging region during the constant current control.
Claim 24
Dependent Claim
31 words
An apparatus according to claim 1, wherein said bias applying means stores a voltage produced during the constant current control, and the stored voltage is used during the constant voltage control.
Claim 25
Dependent Claim
201 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; transfer means for transferring the image from said image bearing member onto a transfer material in an image transfer region, said transfer means including a charging member opposing said image bearing member and bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level thereto when an image area of said image bearing member is in the transfer region, and effects a constant current control to said charging member by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which an area of said image bearing member other than the image area is in the transfer region, wherein a level of a voltage of the constant voltage control is determined on the basis of a voltage produced in the transfer means during the constant current control.
Claim 26
Dependent Claim
201 words
An image forming apparatus, comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; transfer means for transferring the image from said image bearing member onto a transfer material in an image transfer region, said transfer means including a charging member opposing said image bearing member and bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level thereto when an image area of said image bearing member is in the transfer region, and effects a constant current control to said charging member by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which an area of said image bearing member other than the image area is in the transfer region, wherein a level of a voltage of the constant voltage control is determined on the basis of a voltage produced in the transfer means during the constant current control.
Claim 27
Dependent Claim
17 words
An apparatus according to claim 24, wherein said charging member is contactable to said image bearing member.
Claim 28
Dependent Claim
36 words
An apparatus according to claim 24, wherein said image forming means includes latent image forming means for forming a latent image on said image bearing member and developing means for developing the latent image with toner.
Claim 29
Dependent Claim
30 words
An apparatus according to claim 26, wherein the image area of said image bearing member is an area in which a toner image is formed on said image bearing member.
Claim 30
Dependent Claim
25 words
An apparatus according to claim 24, wherein the image area of said image bearing member is an area which is contacted to the transfer material.
Claim 31
Dependent Claim
35 words
An apparatus according to claim 24, wherein the area other than the image area is on upstream and downstream sides of the image area with respect to a movement direction of said image bearing member.
Claim 32
Dependent Claim
23 words
An apparatus according to claim 24, wherein the period includes a period in which the transfer material is not in the transfer region.
Claim 33
Dependent Claim
25 words
An apparatus according to claim 24, wherein the period includes a period in which said image bearing member is moved before the image is produced.
Claim 34
Dependent Claim
35 words
An apparatus according to claim 24, wherein the area other than the image area includes an area between the image region and a next image region during continuous image formation on said image bearing member.
Claim 35
Dependent Claim
37 words
An apparatus according to claim 24, wherein the constant current control is effected before the image is produced, and the constant voltage control is effected until a predetermined number of the image areas reach the transfer region.
Claim 36
Dependent Claim
30 words
An apparatus according to claim 33, wherein when a predetermined number of image areas pass through the transfer region, the constant current control is effected, and the operation is repeated.
Claim 37
Dependent Claim
17 words
An apparatus according to claim 25, wherein said charging member is in the form of a roller.
Claim 38
Dependent Claim
17 words
An apparatus according to claim 25, wherein said charging member is in the form of a belt.
Claim 39
Dependent Claim
21 words
An apparatus according to claim 26, wherein said latent image forming means includes charging means for charging said image bearing member.
Claim 40
Dependent Claim
43 words
An apparatus according to claim 37, wherein said image bearing member is a photosensitive member, and said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information.
Claim 41
Dependent Claim
43 words
An apparatus according to claim 37, wherein prior to the latent image being formed on said image bearing member, said charging means charges an area of said image bearing member which is to be in the transfer region during the constant current control.
Claim 42
Dependent Claim
32 words
An apparatus according to claim 37 or 39, wherein said developing means develops the latent image with toner electrically charged to the same polarity as the charging polarity of said charging means.
Claim 43
Dependent Claim
43 words
An apparatus according to claim 40, wherein said image bearing member is a photosensitive member, and said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information.
Claim 44
Dependent Claim
53 words
An apparatus according to claim 38, wherein said exposure means exposes to light at least a part of an area other than the image area of said image bearing member, and the exposed area is different from the area of the image bearing member in the transfer region during the constant current control.
Claim 45
Dependent Claim
22 words
An apparatus according to claim 24, wherein the voltage level of said transfer means is a voltage produced at said charging member.
Claim 46
Dependent Claim
24 words
An apparatus according to claim 24, wherein the voltage level produced in said transfer means is a voltage produced in the said applying means.
Claim 47
Dependent Claim
33 words
An apparatus according to claim 24, wherein said bias applying means stores the voltage produced in said transfer means, and controls said charging member using the stored voltage, during the constant voltage control.
Claim 48
Dependent Claim
22 words
An apparatus according to claim 24, wherein the voltage produced in said transfer means corresponds to a resistance of the charging member.
Claim 49
Dependent Claim
180 words
An image forming apparatus comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; a charging member opposed to said image bearing member; bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level thereto when an image area of said image bearing member is in a charging region of said charging member, and effect a constant current control to said charging member by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during a part of period in which an area of said image bearing member other than the image area is in the charging region; and storing means for storing a voltage appearing during the constant current control, and determining a level of voltage of the constant voltage control on the basis of the stored voltage.
Claim 50
Dependent Claim
180 words
An image forming apparatus comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; a charging member opposed to said image bearing member; bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level thereto when an image area of said image bearing member is in a charging region of said charging member, and effect a constant current control to said charging member by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during a part of period in which an area of said image bearing member other than the image area is in the charging region; and storing means for storing a voltage appearing during the constant current control, and determining a level of voltage of the constant voltage control on the basis of the stored voltage.
Claim 51
Dependent Claim
17 words
An apparatus according to claim 47, wherein said charging member is contactable to said image bearing member.
Claim 52
Dependent Claim
59 words
An apparatus according to claim 47, wherein the image on said image bearing member is transferred onto a transfer material by passing the transfer material between said image bearing member and said charging member so that the transfer material is contacted to the surface of said image bearing member on which the image is formed, in the charging region.
Claim 53
Dependent Claim
36 words
An apparatus according to claim 47, wherein said image forming means includes latent image forming means for forming a latent image on said image bearing member and developing means for developing the latent image with toner.
Claim 54
Dependent Claim
30 words
An apparatus according to claim 50, wherein the image area of said image bearing member is an area in which a toner image is formed on said image bearing member.
Claim 55
Dependent Claim
25 words
An apparatus according to claim 49, wherein the image area of said image bearing member is an area which is contacted to the transfer material.
Claim 56
Dependent Claim
35 words
An apparatus according to claim 47, wherein the area other than the image area is on upstream and downstream sides of the image area with respect to a movement direction of said image bearing member.
Claim 57
Dependent Claim
23 words
An apparatus according to claim 49, wherein the period includes a period in which the transfer material is not in the charging region.
Claim 58
Dependent Claim
25 words
An apparatus according to claim 47, wherein the period includes a period in which said image bearing member is moved before the image is produced.
Claim 59
Dependent Claim
35 words
An apparatus according to claim 47, wherein the area other than the image area includes an area between the image region and a next image region during continuous image formation on said image bearing member.
Claim 60
Dependent Claim
37 words
An apparatus according to claim 47, wherein the constant current control is effected before the image is produced, and the constant voltage control is effected until a predetermined number of the image areas reach the charging region.
Claim 61
Dependent Claim
30 words
An apparatus according to claim 57, wherein when a predetermined number of image areas pass through the charging region, the constant current control is effected, and the operation is repeated.
Claim 62
Dependent Claim
17 words
An apparatus according to claim 48, wherein said charging member is in the form of a roller.
Claim 63
Dependent Claim
17 words
An apparatus according to claim 48, wherein said charging member is in the form of a belt.
Claim 64
Dependent Claim
21 words
An apparatus according to claim 50, wherein said latent image forming means includes charging means for charging said image bearing member.
Claim 65
Dependent Claim
36 words
An image forming apparatus according to claim 61, wherein said charging means includes a second charging member and second bias voltage applying means having the same structure as said charging member and bias applying means, respectively.
Claim 66
Dependent Claim
59 words
An apparatus according to claim 61, wherein the image on said image bearing member is transferred onto a transfer material by passing the transfer material between said image bearing member and said charging member so that the transfer material is contacted to a surface of said image bearing member on which the image is formed, in the charging region.
Claim 67
Dependent Claim
43 words
An apparatus according to claim 63, wherein said image bearing member is a photosensitive member, and said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information.
Claim 68
Dependent Claim
43 words
An apparatus according to claim 63, wherein prior to the latent image being formed on said image bearing member, said charging means charges an area of said image bearing member which is to be in the charging region during the constant current control.
Claim 69
Dependent Claim
33 words
An apparatus according to claim 63 or 65, wherein said developing means develops the latent image with toner having a polarity which is the same as the charging polarity of the charging means.
Claim 70
Dependent Claim
43 words
An apparatus according to claim 66, wherein said image bearing member is a photosensitive member, and said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information.
Claim 71
Dependent Claim
82 words
An apparatus according to claim 61, wherein said latent image forming means includes exposure means for exposing said image bearing member electrically charged by said charging means to light in accordance with image information, and wherein said exposure means exposes to light at least a part of an area other than the image area of said image bearing member, and the exposed area is different from the area of the image bearing member in the charging region during the constant current control.
Claim 72
Dependent Claim
24 words
An apparatus according to claim 47, wherein said bias applying means controls said charging member using the stored voltage, during the constant voltage control.
Claim 73
Dependent Claim
152 words
An image forming apparatus comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; a charging member disposed opposing said image bearing member; and bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level to said charging member when an image area of said image bearing member is in a charging region of said charging member, and effects a constant current control by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which an area of said image bearing member other than the image area is in the charging region.
Claim 74
Dependent Claim
152 words
An image forming apparatus comprising: a movable image bearing member; image forming means for forming an image on said image bearing member; a charging member disposed opposing said image bearing member; and bias applying means for applying a bias voltage to said charging member, wherein said bias applying means effects a constant voltage control to said charging member by supplying a constant voltage level to said charging member when an image area of said image bearing member is in a charging region of said charging member, and effects a constant current control by supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which an area of said image bearing member other than the image area is in the charging region.
Claim 75
Dependent Claim
53 words
An apparatus according to claim 21, wherein said exposure means exposes to light at least a part of an area other than the image area of said image bearing member, and the exposed area is different from the area of the image bearing member in the charging region during the constant current control.
Claim 76
Dependent Claim
53 words
An apparatus according to claim 41, wherein said exposure means exposes to light at least a part of an area other than the image area of said image bearing member, and the exposed area is different from the area of the image bearing member in the transfer region during the constant current control.
Claim 77
Dependent Claim
53 words
An apparatus according to claim 67, wherein said exposure means exposes to light at least a part of an area other than the image area of said image bearing member, and the exposed area is different from the area of the image bearing member in the charging region during the constant current control.
Claim 78
Dependent Claim
154 words
An image forming apparatus comprising: image forming means for forming an image on a recording material, said image forming means including a movable image bearing member, a charging member disposed opposing said image bearing member and a power source for supplying electric power to said charging member; first control means for supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, during at least a part of a period in which an area of said image bearing member other than an image area is in a charging region of said charging member, while said image bearing member moves; storing means for storing a voltage provided during operation of said first control means; and second control means for controlling an image forming condition of said image forming means on the basis of the voltage stored by said storing means.
Claim 79
Dependent Claim
154 words
An image forming apparatus comprising: image forming means for forming an image on a recording material, said image forming means including a movable image bearing member, a charging member disposed opposing said image bearing member and a power source for supplying electric power to said charging member; first control means for supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, during at least a part of a period in which an area of said image bearing member other than an image area is in a charging region of said charging member, while said image bearing member moves; storing means for storing a voltage provided during operation of said first control means; and second control means for controlling an image forming condition of said image forming means on the basis of the voltage stored by said storing means.
Claim 80
Dependent Claim
32 words
An apparatus according to claim 74, wherein said charging member is an image transfer member for transferring the image from said image bearing member onto the recording material at the charging region.
Claim 81
Dependent Claim
18 words
An apparatus according to claim 75, wherein said charging member contacts a back side of the recording material.
Claim 82
Dependent Claim
60 words
An apparatus according to claim 75, wherein said image forming means further includes developing means for developing a latent image formed on said image bearing member into a toner image, and wherein said first control means constant-current controls the charging member during at least a part of a period in which the toner image is not in the charging region.
Claim 83
Dependent Claim
64 words
An apparatus according to claim 75, wherein said image forming means, further includes developing means for developing a latent image formed on said image bearing member into a toner image, and wherein said first control means constant-current controls the charging member during at least a part of a period in which neither the toner image nor the recording material is in the charging region.
Claim 84
Dependent Claim
49 words
An apparatus according to claim 74, further comprising constant voltage control means for supplying said charging member with a constant level of voltage, wherein said second control means controls the voltage level supplied by said constant voltage control means in accordance with the voltage stored in said storing means.
Claim 85
Dependent Claim
55 words
An apparatus according to claim 77, further comprising constant voltage control means for supplying said transfer member with a predetermined constant level of voltage, wherein said second control means controls the voltage level supplied by said constant voltage control means during an image transfer operation in accordance with the voltage stored in said storing means.
Claim 86
Dependent Claim
55 words
An apparatus according to claim 78, further comprising constant voltage control means for supplying said transfer member with a predetermined constant level of voltage, wherein said second control means controls the voltage level supplied by said constant voltage control means during an image transfer operation in accordance with the voltage stored in said storing means.
Claim 87
Dependent Claim
14 words
An apparatus according to claim 74, wherein said charging member is a rotatable member.
Claim 88
Independent Claim
26 words
An apparatus according to any one of claims 74, 76, 77, 78, 79, 80, 81 and 82, wherein said charging member contacts said image bearing member.
Claim 89
Dependent Claim
146 words
An image forming apparatus, comprising: image forming means for forming an image on a recording material, said image forming means including a movable image bearing member, a charging member disposed opposing said image bearing member and a power source for supplying electric power to said charging member; first control means for supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which the recording material is not in a charging region of said charging member; storing means for storing a voltage provided during operation of said first control means; and second control means for controlling an image forming condition of said image forming means on the basis of the voltage stored by said storing means.
Claim 90
Dependent Claim
146 words
An image forming apparatus, comprising: image forming means for forming an image on a recording material, said image forming means including a movable image bearing member, a charging member disposed opposing said image bearing member and a power source for supplying electric power to said charging member; first control means for supplying a current to said charging member so as to maintain a constant level of current flow from said charging member to said image bearing member, while said image bearing member moves, during at least a part of a period in which the recording material is not in a charging region of said charging member; storing means for storing a voltage provided during operation of said first control means; and second control means for controlling an image forming condition of said image forming means on the basis of the voltage stored by said storing means.
Claim 91
Dependent Claim
32 words
An apparatus according to claim 84, wherein said charging member is an image transfer member for transferring the image from said image bearing member onto the recording material at the charging region.
Claim 92
Dependent Claim
18 words
An apparatus according to claim 85, wherein said charging member contacts a back side of the recording material.
Claim 93
Dependent Claim
60 words
An apparatus according to claim 85, wherein said image forming means further includes developing means for developing a latent image formed on said image bearing member into a toner image, and wherein said first control means constant-current controls the charging member, during at least a part of the period in which the recording material is not in the charging region.
Claim 94
Dependent Claim
49 words
An apparatus according to claim 84, further comprising constant voltage control means for supplying said charging member with a constant level of voltage, wherein said second control means controls the voltage level supplied by said constant voltage control means in accordance with the voltage stored in said storing means.
Claim 95
Dependent Claim
55 words
An apparatus according to claim 87, further comprising constant voltage control means for supplying said transfer member with a predetermined constant level of voltage, wherein said second control means controls the voltage level supplied by said constant voltage control means during an image transfer operation in accordance with the voltage stored in said storing means.
Claim 96
Dependent Claim
14 words
An apparatus according to claim 84, wherein said charging member is a rotatable member.
Claim 97
Independent Claim
24 words
An apparatus according to any one of claims 84, 86, 87, 88, 89 and 90, wherein said charging member contacts said image bearing member.
Claim 98
Independent Claim
37 words
An apparatus according to any one of claims to 82 and 84 to 90, wherein the voltage stored by said storing means is a voltage applied to said charging means during operation of said first control means.
Claim 99
Independent Claim
82 words
An apparatus according to any one of claims 74 to 82, wherein said image bearing member is a photosensitive member, and said image forming means includes exposure means for exposing said photosensitive member to image light, wherein said exposure means exposes an area other than the image area of the image bearing member, and the area exposed by said exposure means is different from the area of the image bearing member in the charging region during operation of said first control means.
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