EP0109722A1
Expired / Lapsed
EP
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A method and an apparatus for automatically adjusting the potential of a photosensitive layer
Assignee: Nederlandsche Apparatenfabriek NEDAP NV
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Filing: 1983-11-18
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Granted: —
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Expires: 2003-11-18
Abstract
Abstract @ A method of automatically adjusting the potential of a photosensitive layer, in which the photosensitive layer is moved along a corotron energized by a high voltage supply and is charged thereby, in which the potential of a corotron-charged portion of the photosensitive layer is measured contactlessly by means of an electrometer device; that the value measured is compared with a predetermined target value, after which, if the difference between the value measured and the target value lies beyond predetermined limits, an adjustment parameter of the high voltage supply is changed; and that after a period of time minimally equal to the time required for moving the portion of the photosensitive layer charged with the new setting of the high voltage supply from the corotron to the electrometer, the potential of the photosensitive layer is measured again and compared with the target value, after which, if the difference between the target value and the value measured lies beyond predetermined limits, the said adjustment parameter is again changed, which cycle is repeated as long as the difference between the target value and the value measured lies within the predetermined limits.
Inventors
- 👤 Gerben Simon Hoeksma
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:25
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0266; G03G15/0291
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
A method of automatically adjusting the potential of a photosensitive layer, in which the photosensitive layer is moved along a corotron energized by a high voltage supply and is charged thereby, characterized in that the potential of a corotron-charged portion of the photosensitive layer is measured contactlessly by means of an electrometer device; that the value measured is compared with a predetermined target value, after which, if the difference between the value measured and the target value lies beyond predetermined limits, an adjustment parameter of the high voltage supply is changed; and that after a period of time minimally equal to the time required for moving the portion of the photosensitive layer charged with the new setting of the high voltage supply from the corotron to the electrometer, the potential of the photosensitive layer is measured again and compared with the target value, after which, if the difference between the target value and the value measured lies beyond predetermined limits, the said adjustment parameter is again changed, which cycle is repeated as long as the difference between the target value and the Value measured lies within the predetermined limits.
Claim 2
Independent Claim
189 words
A method of automatically adjusting the potential of a photosensitive layer, in which the photosensitive layer is moved along a corotron energized by a high voltage supply and is charged thereby, characterized in that the potential of a corotron-charged portion of the photosensitive layer is measured contactlessly by means of an electrometer device; that the value measured is compared with a predetermined target value, after which, if the difference between the value measured and the target value lies beyond predetermined limits, an adjustment parameter of the high voltage supply is changed; and that after a period of time minimally equal to the time required for moving the portion of the photosensitive layer charged with the new setting of the high voltage supply from the corotron to the electrometer, the potential of the photosensitive layer is measured again and compared with the target value, after which, if the difference between the target value and the value measured lies beyond predetermined limits, the said adjustment parameter is again changed, which cycle is repeated as long as the difference between the target value and the Value measured lies within the predetermined limits.
Claim 3
Independent Claim
112 words
An apparatus for automatically adjusting the potential of a photosensitive layer, comprising a corotron energized by a high voltage supply, along which corotron the photosensitive layer is moved, characterized by an electrometer device along which the photosensitive layer, after having been charged by the corotron, is moved, which electrometer device measures contactlessly the potential of the photosensitive layer; a comparator for comparing the value measured of the potential with a predetermined target value, which comparator transmits an output signal dependent on the difference between the value measured and the target value and which is supplied to the high voltage supply in order to control an adjustment parameter of the high voltage supply.
Claim 4
Independent Claim
112 words
An apparatus for automatically adjusting the potential of a photosensitive layer, comprising a corotron energized by a high voltage supply, along which corotron the photosensitive layer is moved, characterized by an electrometer device along which the photosensitive layer, after having been charged by the corotron, is moved, which electrometer device measures contactlessly the potential of the photosensitive layer; a comparator for comparing the value measured of the potential with a predetermined target value, which comparator transmits an output signal dependent on the difference between the value measured and the target value and which is supplied to the high voltage supply in order to control an adjustment parameter of the high voltage supply.
Claim 5
Dependent Claim
58 words
An apparatus according to claim 2, characterized in that the electrometer comprises an electrometer of the type with a rotary chopper blade, as well as a synchronous detector for rectifying the output signal of the electrometer in synchronism with the rotary chopper blade, while the output of the synchronous detector is connected to the input of the comparator.
Claim 6
Dependent Claim
39 words
An apparatus according to claim 3, characterized in that the chopper blade of the electrometer is connected to a reference voltage source U f supplying a voltage corresponding to the desired value of the potential of the photosensitive layer.
Claim 7
Independent Claim
27 words
An apparatus according to any one of claims 2-4, characterized by a timer which controls the electrometer, corresponding to the speed of motion of the photosensitive layer.
References Cited (Backward Citations)
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