Patent US4803515A successfully refreshed from Google Patents.
US4803515A
Expired / Lapsed
US
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Image forming apparatus
Assignee: Canon Inc
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Filing: 1987-06-29
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Granted: 1989-02-07
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Expires: 2007-06-29
Abstract
Abstract An image forming apparatus includes a movable image bearing member; a driver for driving the image bearing member; elements for forming a latent image on the image bearing member; a developing device for developing the latent image formed on the image bearing member by the latent image forming elements; and a transferring device for transferring a developed image developed by the developing device onto an image receptor. The time interval required for the image bearing member to move from a latent image forming position, where the latent image forming elements form the latent image on the image bearing member, to a transfer position, where the transferring device transfers the developed image onto the image receptor, is an integer multiple of a period of the drive non-uniformity inherent in the driver.
Inventors
- 👤 Osamu Hoshino
- 👤 Kazuyoshi Chiku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:58
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/01; G03G15/0142; G03G15/0178; G03G15/0194; G03G2215/00; G03G2215/01; G03G2215/0103; G03G2215/0119; G03G2215/0151; G03G2215/0158
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
An image forming apparatus, comprising: a movable image bearing member; driving means for driving said image bearing member; means for forming a latent image on said image bearing member; developing means for developing the latent image formed on said image bearing member by said latent image forming means; and means for transferring a developed image developed by said developing means onto an image receptor; wherein the time interval required for said image bearing member to move from a latent image forming position at which said latent image forming means forms the latent image on said image bearing member to a transfer position at which said transfer means transfers the developed image onto the image receptor is an integer multiple of a period of a drive non-uniformity inherent in said driving means.
Claim 2
Dependent Claim
131 words
An image forming apparatus, comprising: a movable image bearing member; driving means for driving said image bearing member; means for forming a latent image on said image bearing member; developing means for developing the latent image formed on said image bearing member by said latent image forming means; and means for transferring a developed image developed by said developing means onto an image receptor; wherein the time interval required for said image bearing member to move from a latent image forming position at which said latent image forming means forms the latent image on said image bearing member to a transfer position at which said transfer means transfers the developed image onto the image receptor is an integer multiple of a period of a drive non-uniformity inherent in said driving means.
Claim 3
Dependent Claim
32 words
An apparatus according to claim 1, further comprising a plurality of said movable image bearing members are disposed along a direction of movement of the image receptor for receiving the developed image.
Claim 4
Dependent Claim
19 words
An apparatus according to claim 2, wherein said driving means is common to said plurality of image bearing members.
Claim 5
Dependent Claim
72 words
An apparatus according ot claim 2, further comprising a plurality of said image forming means and a plurality of said developing means forming different color developed images on said plurality of movable image bearing members, respectively, and wherein when the image receptor passes through the transfer positions of the respective plurality of image bearing members, the different color developed images are sequentially transferred onto the image receptor to provide a multi-color image.
Claim 6
Dependent Claim
36 words
An apparatus according to claim 3, wherein the time period required for the image receptor to move between adjacent transfer positions is an integer multiple of the period of drive non-uniformity inherent in the driving means.
Claim 7
Dependent Claim
72 words
An apparatus according to claim 3, further comprising a plurality of said image forming means and a plurality of said developing means forming different color developed images on said plurality of movable image bearing members, respectively, and wherein when the image receptor passes through the transfer positions of the respective plurality of image bearing members, the different color developed images are sequentially transferred onto the image receptor to provide a multi-color image.
Claim 8
Dependent Claim
72 words
An apparatus according to claim 5, further comprising a plurality of said image forming means and a plurality of said developing means forming different color developed image on said plurality of movable image bearing members, respectively, and wherein when the image receptor passes through the transfer positions of the respective plurality of image bearing members, the different color developed images are sequentially transferred onto the image receptor to provide a multi-color image.
Claim 9
Dependent Claim
17 words
An apparatus according to claim 1, wherein said image forming means includes laser beam optical scanning means.
Claim 10
Dependent Claim
108 words
An image forming apparatus, comprising: a plurality of movable image bearing members; a common driving means for driving said plurality of image bearing members; a plurality of image forming means for forming images on said plurality of image bearing members, respectively; and means for moving an image receptor through respective image transfer positions of said plurality of image bearing members to receive the images formed on said plurality of image bearing members; wherein the time interval required for the image receptor to move between the transfer positions of adjacent image bearing members is an integer multiple of a period of drive non-uniformity inherent in said common driving means.
Claim 11
Dependent Claim
108 words
An image forming apparatus, comprising: a plurality of movable image bearing members; a common driving means for driving said plurality of image bearing members; a plurality of image forming means for forming images on said plurality of image bearing members, respectively; and means for moving an image receptor through respective image transfer positions of said plurality of image bearing members to receive the images formed on said plurality of image bearing members; wherein the time interval required for the image receptor to move between the transfer positions of adjacent image bearing members is an integer multiple of a period of drive non-uniformity inherent in said common driving means.
Claim 12
Dependent Claim
24 words
An apparatus according to claim 9, wherein said plurality of image bearing members are disposed along a direction of movement of the image receptor.
Claim 13
Dependent Claim
40 words
An apparatus according to claim 10, wherein said plurality of image forming means form different color images on respective image bearing members, and are sequentially transferred onto the image receptor, whereby a multi-color image is formed on the image receptor.
Claim 14
Dependent Claim
17 words
An apparatus according to claim 9, wherein said image forming means includes laser beam optical scanning means.
References Cited (Backward Citations)
US4531828A
Cited
US4690542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |