EP0035745A2
Expired / Lapsed
EP
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Charging device
Assignee: Toshiba Corp
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Filing: 1981-03-04
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Granted: —
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Expires: 2001-03-04
Abstract
Abstract A charging device (11) comprises a contact piled cloth (45) which is formed of pliable material, has an electric resistance chosen to be 10 8 Ω.cm and contacts a photosensitive layer (4) of a photosensitive drum (4a), an electrode (43) which is connected to the contact piled cloth (45) and has a lower electric resistance than a prescribed level of the contact piled cloth (45), and a D.C. power source (E and A.C. power source (E 2 ) for supplying D.C. and A.C. voltages on the electrode (43) to charge the photosensitive layer (4).
Inventors
- 👤 Kohachi Uchida
- 👤 Yoshitsugu Nakatomi
- 👤 Toshimasa Takano
- 👤 Hideo Mukai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 07:43
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
72 words
A charging device comprising: a contact member (45) which is formed of pliable material, has a prescribed electric resistance and contacts an object to be charged (4); an electrode (43) which is connected to the contact member (45) and has a lower electric resistance than that of said contact member; and means (E 1 , E 2 ) for supplying voltage on the electrode (43) to charge the object to be charged.
Claim 2
Dependent Claim
72 words
A charging device comprising: a contact member (45) which is formed of pliable material, has a prescribed electric resistance and contacts an object to be charged (4); an electrode (43) which is connected to the contact member (45) and has a lower electric resistance than that of said contact member; and means (E 1 , E 2 ) for supplying voltage on the electrode (43) to charge the object to be charged.
Claim 3
Dependent Claim
23 words
The charging device according to claim 1, wherein the contact member comprises a fiber base and a large number of furs planted thereon.
Claim 4
Dependent Claim
66 words
The charging device according to claim 2, which further comprises a base and a cushioning layer formed on that portion of said base which faces the object to be charged, and wherein the electrode is provided on that side of the cushioning layer which faces the object to be charged; and the fiber base is tightly attached to the electrode by means of a conductive adhesive.
Claim 5
Dependent Claim
23 words
The charging device according to claim 3, wherein the base of said charging device is made movable from the object to be charged.
Claim 6
Dependent Claim
17 words
The charging device according to claim 4, wherein the voltage-supplying means comprises A.C. and D.C. power sources.
Claim 7
Dependent Claim
43 words
The charging device according to claim 5, which - further comprises an A.C. conductor for connecting the A.C. power source to one part of the electrode, and a D.C. conductor for connecting the D.C. power scarce to the other part of the electrode.
Claim 8
Dependent Claim
70 words
The charging device according to claim 6, wherein the object to be charged is formed of a photosensitive layer mounted on the surface of a rotatable drum; the D.C. conductor is connected to the forward end of the electrode as viewed from the rotating direction of the drum and the A.C. conductor is connected to the rear end of the electrode as viewed from the rotating direction of the drum.
Claim 9
Dependent Claim
16 words
The charging device according to claim 7, wherein the photosensitive layer mainly consists of zinc oxide.
Claim 10
Dependent Claim
25 words
The charging device according to any of claims 3 to 8, which further comprises means for removing moisture from the furs of the contact cloth.
Claim 11
Dependent Claim
56 words
The charging device according to claim 9, wherein the moisture-removing means comprises: a heating layer mounted on that side of the cushioning layer which faces the object to be charged; an insulation layer interposed between the heating layer and electrode; and a power source for supplying power to the heater to cause it, to emit heat.
Claim 12
Dependent Claim
73 words
The charging device according to claim 9,' wherein the moisture-removing means comprises: a device for detecting the humidity of the furs of the contact cloth; and a mechanism for drawing the base of the charging device toward the object to be charged in accordance with the detected humidity of said furs, and when pressed against the object to be charged, the furs generate heat by frictional engagement with said object to be charged.
Claim 13
Dependent Claim
54 words
The charging device according to claim 4, which further comprises: a base of the other charging device; and another cushioning layer, another electrode and another contact member mounted in the order mentioned on that side of the base of said other charging device which faces the object to be charged as counted from said.side.
Claim 14
Dependent Claim
17 words
The charging device according to claim 12, wherein the voltage-supplying means comprises A.C. and D.C. power sources.
Claim 15
Dependent Claim
36 words
The charging device according to claim 13, which further comprises: an A.C. conductor for connecting the A.C. power source to one electrode; and a D.C. conductor for connecting the D.C. power source to the other electrode.
Claim 16
Dependent Claim
61 words
The charging device according to claim 1 or 2, which further comprises: a pair of rollers; and a mechanism for rotating at least one of said paired rollers, and wherein the electrode and contact member are respectively constructed in the form of an endless belt; and both endless belts are superposed on each other and jointly stretched across said paired rollers.
Claim 17
Dependent Claim
52 words
The charging device according to claim 15, wherein the voltage-supplying means comprises A.C. and D.C. power sources; the paired rollers are formed of conductive material alike; one of said paired rollers is connected to the A.C. power source; and the other of said paired rollers is connected to the D.C. power source.
Claim 18
Dependent Claim
57 words
The charging device according to claim 3, wherein the base of the charging device is formed into a parallelepiped having a square cross section, and made ' rotatable about the central line of said square cross secton; and the cushioning layer, electrode and contact member are extended along the respective periph.ral planes centered by the pivotal shaft.
Claim 19
Dependent Claim
57 words
The charging device according to claim 3, wherein the base of the charging device is made into a cylindrical form and rotated about the pivotal shaft; and the cushioning layer, electrode and contact member are mounted on the peripheral wall of the base of the charging device in the order mentioned as counted from said peripheral wall.
References Cited (Backward Citations)
No citation records indexed.
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