US4851960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Charging device
Assignee: Canon Inc
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Filing: 1987-12-11
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Granted: 1989-07-25
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Expires: 2007-12-11
Abstract
Abstract A charging device for contact-charging a member to be charged. A charging device for charging a movable member to be charged includes a contacting member adapted to contacting the member to be charged, and means for forming a vibratory electric field between the member to be charged and the contacting member, the vibratory electric field forming means applying between the members a vibratory voltage having a peak-to-peak value not less than twice an absolute value of charge starting voltage to the member to be charged. The member to be charged can be uniformly charged.
Inventors
- 👤 Shunji Nakamura
- 👤 Hiromitsu Hirabayashi
- 👤 Junji Araya
- 👤 Noribumi Koitabashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:41
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A charging device for charging a movable member to be charged, comprising: a contacting member adapted to contacting the member to be charged; and means for forming a vibratory electric field between the member to be charged and the contacting member, the vibratory electric field forming means applying between the members a vibratory voltage having a peak-to-peak value not less than twice an absolute value of a charge starting voltage to the member to be charged.
Claim 2
Dependent Claim
76 words
A charging device for charging a movable member to be charged, comprising: a contacting member adapted to contacting the member to be charged; and means for forming a vibratory electric field between the member to be charged and the contacting member, the vibratory electric field forming means applying between the members a vibratory voltage having a peak-to-peak value not less than twice an absolute value of a charge starting voltage to the member to be charged.
Claim 3
Dependent Claim
41 words
A charging device according to claim 1, wherein said contacting member has a portion which is increasingly away from the member to be charged toward direction from a contact portion therebetween with respect to movement of the member to be charged.
Claim 4
Dependent Claim
15 words
A charging device according to claim 2, wherein said contacting member is a rotational member.
Claim 5
Dependent Claim
15 words
A charging device according to claim 3, wherein said contacting member is a conductive roller.
Claim 6
Dependent Claim
30 words
A charging device according to claim 1 or 2, wherein said vibratory electric field is provided by a vibratory voltage provided by superposing a DC voltage and an AC voltage.
Claim 7
Dependent Claim
36 words
A charging device according to claim 5, wherein said charge starting voltage is a voltage when a charging starts with the DC voltage alone is applied between the contacting member and the member to be charged.
Claim 8
Dependent Claim
17 words
A charging device according to claim 1, wherein said member to be charged is a photosensitive member.
Claim 9
Dependent Claim
17 words
A charging device according to claim 1, wherein the vibratory voltage has a sine curve wave form.
Claim 10
Dependent Claim
29 words
A charging device according to claim 1, wherein said contacting member is coated with a material having a resistivity in the range of 10 2 to 10 10 ohm-cm.
Claim 11
Dependent Claim
31 words
A charging device according to claim 1, wherein the potential of the member to be charged after being charged by said contacting member is uniform irrespective of its potential before charging.
Claim 12
Dependent Claim
27 words
A charging device according to claim 3, wherein said contacting member is a rotational member which rotates to follow the movement of the member to be charged.
Claim 13
Dependent Claim
31 words
A charging device according to claim 4, wherein the contacting member comprises a conductive roller having a core member, a layer covering said core member, and a surface layer formed thereon.
Claim 14
Dependent Claim
20 words
A charging device according to claim 7, wherein the member to be charged is composed of an organic photoconductive material.
References Cited (Backward Citations)
JPS56104347A
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US4380384A
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EP0035745A2
Cited
US4371252A
Cited
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Cited
GB2129372A
Cited
JPS60216361A
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EP0280542A2
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-24 | 1993-01-23 | 1993-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-24 | 1997-01-23 | 1997-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-24 | 2001-01-23 | 2001-07-25 | $7700.00 | Window Closed / Lapsed |