US4631559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image forming method
Assignee: Canon Inc
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Filing: 1984-10-15
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Granted: 1986-12-23
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Expires: 2004-10-15
Abstract
Abstract According to an image forming method wherein information light irradiates a conductive layer of a photosensitive body having the conductive layer and a photoconductive layer, a developing agent is supplied to the photoconductive layer of the photosensitive body while a bias voltage is applied between the conductive layer and the conductive developing agent, and an image corresponding to the information light is formed on the photosensitive body, contamination of the surface of the photosensitive body by the developing agent is prevented by voltage application upon image formation and operation timings of the respective components of an image display apparatus.
Inventors
- 👤 Shuzo Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:20
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/22; G03G15/34; G03G15/344; G09; G09G; G09G3/00; G09G3/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
164 words
An image forming method of irradiating light onto a side of a photosensitive body having a photoconductive layer and a conductive layer, supplying a conductive developing agent to the photosensitive body while a bias voltage is applied between the conductive layer and the developing agent, and forming an image of the developing agent on the photosensitive body in accordance with the light irradiating the photosensitive body, comprising the sequentially performed steps of: starting supplying said photosensitive body with the developing agent from the side opposing the light irradiated side of said photosensitive body and starting driving of said photosensitive body in a direction of image formation, which sub-steps are performed in any order; starting application of the bias voltage between said photosensitive body and the developing agent; stopping application of the bias voltage after irradiation of the light is completed and stopping driving of said photosensitive body, which sub-steps are performed in any order; and stopping supplying said photosensitive body with the developing agent.
Claim 2
Dependent Claim
164 words
An image forming method of irradiating light onto a side of a photosensitive body having a photoconductive layer and a conductive layer, supplying a conductive developing agent to the photosensitive body while a bias voltage is applied between the conductive layer and the developing agent, and forming an image of the developing agent on the photosensitive body in accordance with the light irradiating the photosensitive body, comprising the sequentially performed steps of: starting supplying said photosensitive body with the developing agent from the side opposing the light irradiated side of said photosensitive body and starting driving of said photosensitive body in a direction of image formation, which sub-steps are performed in any order; starting application of the bias voltage between said photosensitive body and the developing agent; stopping application of the bias voltage after irradiation of the light is completed and stopping driving of said photosensitive body, which sub-steps are performed in any order; and stopping supplying said photosensitive body with the developing agent.
Claim 3
Dependent Claim
22 words
A method according to claim 1, wherein the steps of the method are performed in a nonimaging area of said photosensitive body.
Claim 4
Dependent Claim
27 words
A method according to claim 2, wherein said nonimaging area of said photosensitive body has a surface having the same color as that of the developing agent.
Claim 5
Dependent Claim
18 words
A method according to claim 2, wherein said nonimaging area of said photosensitive body has a high resistivity.
Claim 6
Dependent Claim
22 words
A method according to claim 1, wherein an image formed by the developing agent on said photosensitive body can be visually observed.
Claim 7
Dependent Claim
177 words
An image forming method of irradiating light onto a side of a photosensitive drum having a photoconductive layer and a conductive layer, supplying a conductive developing agent to the photosensitive body while a bias voltage is applied between the conductive layer and the developing agent, and forming an image of the developing agent on the photosensitive body in accordance with the light irradiating the photosensitive body, comprising the steps of: upon completion of image formation, stopping application of the bias voltage when irradiation of the light is completed, and separating the developing agent from said photosensitive body and stopping driving of said photosensitive body, which sub-steps are performed in any order; and upon start of image formation, starting driving of said photosensitive body and starting bringing the developing agent into contact with said photosensitive body from the side opposing the light irradiated side of said photosensitive body, which sub-steps are performed in any order, and starting application of the bias voltage between said photosensitive body and the developing agent, thereby forming an image on said photosensitive body.
Claim 8
Dependent Claim
177 words
An image forming method of irradiating light onto a side of a photosensitive drum having a photoconductive layer and a conductive layer, supplying a conductive developing agent to the photosensitive body while a bias voltage is applied between the conductive layer and the developing agent, and forming an image of the developing agent on the photosensitive body in accordance with the light irradiating the photosensitive body, comprising the steps of: upon completion of image formation, stopping application of the bias voltage when irradiation of the light is completed, and separating the developing agent from said photosensitive body and stopping driving of said photosensitive body, which sub-steps are performed in any order; and upon start of image formation, starting driving of said photosensitive body and starting bringing the developing agent into contact with said photosensitive body from the side opposing the light irradiated side of said photosensitive body, which sub-steps are performed in any order, and starting application of the bias voltage between said photosensitive body and the developing agent, thereby forming an image on said photosensitive body.
Claim 9
Dependent Claim
27 words
A method according to claim 6, wherein the developing agent is separated from said photosensitive body by separating a developing agent carrying member from said photosensitive body.
Claim 10
Dependent Claim
29 words
A method according to claim 6, wherein at least the steps other than stopping application of the bias voltage are performed in a nonimaging area of said photosensitive body.
Claim 11
Dependent Claim
23 words
A method according to claim 7, wherein said developing agent carrying member transfers the developing agent after stopping application of the bias voltage.
Claim 12
Dependent Claim
28 words
A method according to claim 9, wherein said developing agent carrying member transfers the developing agent before starting bringing the developing agent into contact with said photosensitive body.
Claim 13
Dependent Claim
27 words
A method according to claim 8, wherein said nonimaging area of said photosensitive body has a surface having the same color as that of the developing agent.
Claim 14
Dependent Claim
21 words
A method according to claim 8, wherein the surface of said nonimaging area of said photosensitive body has a high resistivity.
Claim 15
Dependent Claim
134 words
An image forming method of irradiating light onto a side of a photosensitive body having a photoconductive layer and a conductive layer, supplying a conductive developing agent to the photosensitive body while a bias voltage is applied between the conductive layer and the developing agent, and forming an image of the developing agent on the photosensitive body in accordance with the light irradiating the photosensitive body, comprising the sequentially performed steps of: starting supplying said photosensitive body with the developing agent from the side opposing the light irradiated side of said photosensitive body; starting application of the bias voltage between said photosensitive body and the developing agent; stopping application of the bias voltage when image formation is completed; stopping driving of said photosensitive body; and stopping supplying said photosensitive body with the developing agent.
Claim 16
Dependent Claim
134 words
An image forming method of irradiating light onto a side of a photosensitive body having a photoconductive layer and a conductive layer, supplying a conductive developing agent to the photosensitive body while a bias voltage is applied between the conductive layer and the developing agent, and forming an image of the developing agent on the photosensitive body in accordance with the light irradiating the photosensitive body, comprising the sequentially performed steps of: starting supplying said photosensitive body with the developing agent from the side opposing the light irradiated side of said photosensitive body; starting application of the bias voltage between said photosensitive body and the developing agent; stopping application of the bias voltage when image formation is completed; stopping driving of said photosensitive body; and stopping supplying said photosensitive body with the developing agent.
Claim 17
Dependent Claim
30 words
A method according to claim 1, wherein the sub-steps of starting supplying said photosensitive body with the developing agent and starting driving of said photosensitive body are performed substantially simultaneously.
Claim 18
Dependent Claim
27 words
A method according to claim 1, wherein the sub-steps of stopping application of the bias voltage and stopping driving of said photosensitive body are performed substantially simultaneously.
Claim 19
Dependent Claim
51 words
A method according to claim 1, wherein the sub-steps of starting supplying said photosensitive body with the developing agent and starting driving of said photosensitive body are performed substantially simultaneously and the sub=steps of stopping application of the bias voltage and stopping driving of said photosensitive body are performed substantially simultaneously.
Claim 20
Dependent Claim
29 words
A method according to claim 6, wherein the sub-steps of separating the developing agent from said photosensitive body and stopping driving of said photosensitive body are performed substantially simultaneously.
Claim 21
Dependent Claim
32 words
A method according to claim 6, wherein the sub-steps of starting driving of said photosensitive body and starting bringing the developing agent into contact with said photosensitive body are performed substantially simultaneously.
Claim 22
Dependent Claim
55 words
A method according to claim 6, wherein the sub-steps of separating the developing agent from said photosensitive body and stopping driving of said photosensitive body are performed substantially simultaneously and the sub-steps of starting driving of said photosensitive body and starting bringing the developing agent into contact with said photosensitive body are performed substantially simultaneously.
Claim 23
Dependent Claim
22 words
A method according to claim 6, wherein an image formed by the developing agent on said photosensitive body can be visually observed.
Claim 24
Dependent Claim
22 words
A method according to claim 13, wherein an image formed by the developing agent on said photosensitive body can be visually observed.
References Cited (Backward Citations)
US2986442A
Cited
US4134668A
Cited
US4396275A
Cited
US4547787A
Cited
US4493882A
Cited
US4541706A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
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