EP0272072A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A charging device
Assignee: Canon Inc
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Filing: 1987-12-14
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Granted: —
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Expires: 2007-12-14
Abstract
Abstract A charging device for charging a movable member (1) to be charged includes a contacting member (2) adapted to contact the member to be charged, and means (3) 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. The member to be charged can be uniformly charged.
Inventors
- 👤 Shunji Nakamura
- 👤 Hiromitsu Hirabayashi
- 👤 Junji Araya
- 👤 Noribumi Koitabashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 05:08
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216
Claims Analysis
Total Claims: 11
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 and 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 and 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 downstream 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
60 words
A charging device for a photosensitive member comprising a charging member adapted to contact the photosensitive member, means for moving the photosensitive member and charging member relative to each other, and means for applying a vibrating electric field between the photosensitive member and the charging member having an amplitude substantially as great as a threshold field to commence charge transfer.
Claim 10
Dependent Claim
60 words
A charging device for a photosensitive member comprising a charging member adapted to contact the photosensitive member, means for moving the photosensitive member and charging member relative to each other, and means for applying a vibrating electric field between the photosensitive member and the charging member having an amplitude substantially as great as a threshold field to commence charge transfer.
Claim 11
Dependent Claim
48 words
A device as claimed in claim 8, and arranged such that as the charging member and a portion of the photosensitive member move away from each other the amplitude of vibration of the electric field between the charging member and that portion of the photosensitive member progressively reduces.
References Cited (Backward Citations)
No citation records indexed.
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