US4265531A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotography
Assignee: Canon Inc
•
Filing: 1978-10-24
•
Granted: 1981-05-05
•
Expires: 1998-10-24
Abstract
Abstract Disclosed is a method for protecting a primary electrostatic latent image formed on a screen type photosensitive member. In the step for modulating ion streams or toner particle streams by the primary electrostatic latent image, due to a bias voltage impressed on the screen type photosensitive member natural corona discharge is generated by a corona discharge electrode used for forming a primary electrostatic latent image or natural discharge is generated between the photosensitive member and a conductor located close thereto so that the degradation or destruction of the primary electrostatic latent image result. The present invention provides the methods for solving this problem by electrically isolating the photosensitive member, the corona discharge electrodes and other conductors in the vicinity of the photoconductive member when a bias voltage is impressed on the latter.
Inventors
- 👤 Katsunobu Ohara
- 👤 Nobutoshi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/05; G03G15/051
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
143 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other.
Claim 2
Independent Claim
143 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein the same bias voltage is applied also to said conductive member.
Claim 4
Dependent Claim
17 words
A method according to claim 1, wherein a different bias voltage is applied to said conductive member.
Claim 5
Dependent Claim
24 words
A method according to claim 1, wherein said step of forming a primary electrostatic latent image is performed utilizing means including said conductive member.
Claim 6
Dependent Claim
33 words
A method according to claim 1, wherein said bias voltage is applied at least while applying the corona ion flow from corona ion source means through said photosensitive screen to the chargeable member.
Claim 7
Dependent Claim
18 words
A method according to claim 1, wherein said state is achieved by keeping the conductive member electrically isolated.
Claim 8
Independent Claim
175 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said state is achieved by disposing an insulating member on the conductive member at the side thereof facing said screen type photosensitive member to keep said conductive member electrically isolated.
Claim 9
Independent Claim
175 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said state is achieved by disposing an insulating member on the conductive member at the side thereof facing said screen type photosensitive member to keep said conductive member electrically isolated.
Claim 10
Independent Claim
171 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said state is achieved by interposing a shielding material between the conductive member and said screen type photosensitive member to keep said conductive member electrically isolated.
Claim 11
Independent Claim
171 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said state is achieved by interposing a shielding material between the conductive member and said screen type photosensitive member to keep said conductive member electrically isolated.
Claim 12
Dependent Claim
14 words
A method according to claim 8, wherein said shielding material is an insulating material.
Claim 13
Independent Claim
158 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said state is achieved by applying a bias voltage to said conductive member.
Claim 14
Independent Claim
158 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said state is achieved by applying a bias voltage to said conductive member.
Claim 15
Independent Claim
161 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said conductive member comprises a blocking plate for preventing dust from being deposited on the screen.
Claim 16
Independent Claim
161 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and wherein said conductive member comprises a blocking plate for preventing dust from being deposited on the screen.
Claim 17
Independent Claim
170 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and providing means for detecting a potential of the latent image formed on said screen, and wherein said conductive member comprises a portion of said detecting means.
Claim 18
Independent Claim
170 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other, and providing means for detecting a potential of the latent image formed on said screen, and wherein said conductive member comprises a portion of said detecting means.
Claim 19
Independent Claim
128 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photoconductive member which is stretched by a drum frame to form a screen type drum, wherein a conductive member is disposed adjacent said screen drum, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, and keeping the conductive member adjacent said screen drum in a state to prevent the generation of discharge from one to the other of said conductive member and screen drum.
Claim 20
Independent Claim
128 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photoconductive member which is stretched by a drum frame to form a screen type drum, wherein a conductive member is disposed adjacent said screen drum, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, and keeping the conductive member adjacent said screen drum in a state to prevent the generation of discharge from one to the other of said conductive member and screen drum.
Claim 21
Dependent Claim
132 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 22
Dependent Claim
132 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 23
Dependent Claim
55 words
An apparatus according to claim 14, further comprising means for driving said screen type photosensitive member, a conductive member disposed along and adjacent to a path of movement of said driven screen type member, and means for applying a bias voltage to said screen type member when forming said secondary image on said chargeable member.
Claim 24
Dependent Claim
17 words
An apparatus according to claim 14, wherein said discharge preventing means maintains the conductive member electrically isolated.
Claim 25
Dependent Claim
161 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said discharge preventing means includes an insulating member disposed on the conductive member at the side thereof facing said screen type member to electrically isolate said conductive member.
Claim 26
Dependent Claim
161 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said discharge preventing means includes an insulating member disposed on the conductive member at the side thereof facing said screen type member to electrically isolate said conductive member.
Claim 27
Dependent Claim
156 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said discharge preventing means includes a material interposed between the conductive member and said screen type member to electrically isolate said conductive member.
Claim 28
Dependent Claim
156 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said discharge preventing means includes a material interposed between the conductive member and said screen type member to electrically isolate said conductive member.
Claim 29
Dependent Claim
13 words
An apparatus according to claim 18, wherein said material is an insulating material.
Claim 30
Dependent Claim
148 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said discharge preventing means comprises, means for applying a bias voltage to said conductive member.
Claim 31
Dependent Claim
148 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said discharge preventing means comprises, means for applying a bias voltage to said conductive member.
Claim 32
Dependent Claim
24 words
An apparatus according to claim 20, wherein the bias applying means applies the same bias voltage to both said screen type and conductive members.
Claim 33
Dependent Claim
25 words
An apparatus according to claim 20, wherein said bias voltage applied to said screen type member is different than that applied to said conductive member.
Claim 34
Dependent Claim
147 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, said conductive member comprises blocking means for preventing dust from reaching said screen type member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 35
Dependent Claim
147 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, said conductive member comprises blocking means for preventing dust from reaching said screen type member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 36
Dependent Claim
136 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member and means for applying a bias voltage to said photosensitive member, said apparatus comprising a corona discharger having a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 37
Dependent Claim
136 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member and means for applying a bias voltage to said photosensitive member, said apparatus comprising a corona discharger having a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 38
Dependent Claim
136 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a light-blocking plate having a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 39
Dependent Claim
136 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a light-blocking plate having a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means.
Claim 40
Dependent Claim
152 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said conductive member comprises means for detecting a potential of the latent image formed on said screen type member.
Claim 41
Dependent Claim
152 words
An image formation apparatus which includes a screen type photosensitive member having a number of openings, means for forming a primary electrostatic latent image thereon, means for passing a flow of ions through the openings of said screen type photosensitive member bearing the primary latent image to form a secondary image on a chargeable member, and means for applying a bias voltage to said photosensitive member, said apparatus comprising a conductive member disposed adjacent to said screen type photosensitive member, wherein a potential difference is established between said photosensitive and conductive members, and means for preventing discharge between said screen type member and the conductive member which discharge would otherwise result from said potential difference, at least during the application of the bias voltage to said photosensitive member by said bias means, wherein said conductive member comprises means for detecting a potential of the latent image formed on said screen type member.
Claim 42
Dependent Claim
96 words
An image formation apparatus which includes a screen drum having a conductive drum frame and having a screen type photosensitive member with a number of openings stretched thereon, means for forming a primary electrostatic latent image on said photosensitive member, and means for passing a flow of ions through the openings of said photosensitive member to form a secondary image on a chargeable member, said apparatus comprising driving means for rotating said screen drum, a conductive member disposed adjacent to said screen drum, and means for preventing discharging between said screen drum and said conductive member.
Claim 43
Dependent Claim
96 words
An image formation apparatus which includes a screen drum having a conductive drum frame and having a screen type photosensitive member with a number of openings stretched thereon, means for forming a primary electrostatic latent image on said photosensitive member, and means for passing a flow of ions through the openings of said photosensitive member to form a secondary image on a chargeable member, said apparatus comprising driving means for rotating said screen drum, a conductive member disposed adjacent to said screen drum, and means for preventing discharging between said screen drum and said conductive member.
Claim 44
Independent Claim
152 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member, which is a part of a corona discharger means, is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen, and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other.
Claim 45
Independent Claim
152 words
A method of forming an image on a chargeable member by conducting an ion flow through a screen type photosensitive member having a large number of fine through openings, wherein a conductive member, which is a part of a corona discharger means, is disposed adjacent said photosensitive member, said method comprising the steps of forming a primary electrostatic latent image on said screen type photosensitive member, applying a corona ion flow from corona ion source means through said photosensitive member to the chargeable member, wherein said corona ion flow is modulated through said screen type photosensitive member by said primary latent image, applying a bias voltage to said screen, and maintaining, at least during the application of the bias voltage to said screen, the conductive member adjacent said screen type photosensitive member in a state to prevent the generation of discharge from one of said conductive and photosensitive members to the other.
References Cited (Backward Citations)
US2879395A
Cited
US2856533A
Cited
US2868989A
Cited
US2836725A
Cited
US3881818A
Cited
US3900852A
Cited
US4021109A
Cited
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |