EP0234903B1 - Elektrostatographisches Kopieren - Google Patents
Elektrostatographisches Kopieren Download PDFInfo
- Publication number
- EP0234903B1 EP0234903B1 EP19870301547 EP87301547A EP0234903B1 EP 0234903 B1 EP0234903 B1 EP 0234903B1 EP 19870301547 EP19870301547 EP 19870301547 EP 87301547 A EP87301547 A EP 87301547A EP 0234903 B1 EP0234903 B1 EP 0234903B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- film
- pattern
- paper
- charges
- radio
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000002285 radioactive effect Effects 0.000 claims description 20
- 230000000717 retained effect Effects 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 230000005684 electric field Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- HZEBHPIOVYHPMT-OUBTZVSYSA-N Polonium-210 Chemical compound [210Po] HZEBHPIOVYHPMT-OUBTZVSYSA-N 0.000 claims description 3
- LXQXZNRPTYVCNG-YPZZEJLDSA-N americium-241 Chemical group [241Am] LXQXZNRPTYVCNG-YPZZEJLDSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- PXHVJJICTQNCMI-RNFDNDRNSA-N nickel-63 Chemical compound [63Ni] PXHVJJICTQNCMI-RNFDNDRNSA-N 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 description 3
- 230000005669 field effect Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/65—Apparatus which relate to the handling of copy material
- G03G15/6597—Apparatus which relate to the handling of copy material the imaging being conformed directly on the copy material, e.g. using photosensitive copy material, dielectric copy material for electrostatic printing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
- G03G2215/00371—General use over the entire feeding path
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00443—Copy medium
- G03G2215/00518—Recording medium, e.g. photosensitive
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
- G03G2215/00535—Stable handling of copy medium
- G03G2215/00654—Charging device
Definitions
- the present invention relates to electrostatographic copying.
- a particular application of the invention is to electrostatographic copying in conditions of high temperature and/or high humidity, for example, 45 ° c and/or 95% humidity.
- a method of electrostatographic copying is known in which the copying is done onto electrostatic paper which has a film of highly electrically resistive material on a single side of the paper, the paper being impregnated with electrically conductive resin.
- the known method comprises the steps of applying an electric field pattern to the paper so as to induce a pattern of charges of opposite polarity on opposite sides of the film (due to the field effect), discharging the charge pattern on one side of the film (by means of conduction through the resin-impregnated paper) while substantially retaining the charge pattern on the other side of the film, applying toner medium to the paper so that the toner medium adheres to the paper in the pattern of the retained charge, due to the retained charge, and fixing the toner medium in the aforesaid pattern.
- a method of electrostatographic copying onto electrostatic paper which has a film of highly electrically resistive material on a single side of the paper, comprising the steps of applying an electric field pattern to the paper so as to induce a pattern of retained charges, applying toner medium to the paper so that the toner medium adheres to the paper in the pattern of the retained charges due to the retained charge, and fixing the toner medium in the aforesaid pattern, characterised in that the paper is exposed to emissions of particles from a radio-active source before, during or after applying the electric field pattern, so as to prevent a pattern of charges forming on, or discharge any pattern of charges formed on, one side of the film while permitting formation and substantial retention of a charge pattern of opposite polarity on the other side of the film.
- an apparatus for electrostatographic copying onto electrostatic paper which has a film of highly electrically resistive material on a single side (16a) of the paper (16), comprising means (26,28) for applying an electric field pattern to the paper so as to induce a pattern of retained charge means (40,42) for applying toner medium to the paper so that the toner medium adheres to the paper in the pattern of the retained charges due to the retained charge, and means (44,46,48) for fixing the toner medium in the aforesaid pattern, characterised in that a radio-active source (52,54) arranged to expose the paper to emissions of particles from the radio-active source before, during or after the application of the electric field, so as to prevent a pattern of charges forming on, or discharge any pattern of charges formed on, one side of the film while permitting formation and substantial retention of a charge pattern of opposite polarity on the other side of the film.
- a radio-active source 52,54
- resin-impregnated paper may be used in the above-mentioned method and apparatus (other than in conditions of high temperature and/or high humidity, of course) the provision of the radio-active source obviates the need for resin-impregnated paper, since the energy of the particles from the radio-active source is sufficient to ionise the paper even without resin-impregnation.
- the illustrated electrostatographic copying apparatus 10 comprises a housing 12 which contains a reel 14 of copying paper 16 which has no resin-impregnation but which has a film of highly electrically resistive material on a single side 16a of the paper 16 (and no such film on the other side 16b).
- the paper 16 is arranged to pass out of the housing 12, via a roller 18, upwardly between two guides 20, 22 to a further roller 24, then between a selectively electrically energisable 'comb' 26 and a 'backplane' 28 to a pair of feed rollers 30, 32, then to a guillotine 34, then past a paper loop detector 36 to a toner box 38 having two rollers 40, 42 for applying toner (to the "out-side" of the film) and thence, via a stand of three pressure fix rollers 44, 46, 48 (the paper passing between the two upper rollers 44, 46) to an outlet 50.
- the selectively electrically energisable comb 26 has, for example, 1728 copper wires (not shown) in two lines (not shown), for inducing a dot-matrix charge pattern on the paper according to the energisation of the wires as the paper passes between the comb 26 and the backplane 28.
- the backplane 28, which is on the far side of the paper from the electrically resistive film, is maintained at a high positive voltage (for example, +600 volts). "Energisation" of the wires in the comb 26 takes the form of selective earthing of the wires.
- the apparatus 10 includes means to achieve ionisation of the paper (but not the electrically resistive film) in the form of a radio-active source.
- a radio-active source there are a number of possible positions for this radio active source, for example, just upstream of the comb 26 (as at 52) or just downstream of the comb 26 (as at 54) - see Figs. 1 and 2.
- the radio-active source may for example be americium-241 or nickel-63 or polonium-210. More particularly, the particles emitted by the radio-active source may be of the same polarity as the eventually retained charge pattern or of the opposite polarity.
- the radio-active source is on the opposite side of the paper from the film, whilst the side of the film from which the charge pattern is discharged, due to the ionisation of the paper by the particles from the radio-active source, is the side of the film in contact with the paper, i.e the "in-side" of the film.
- the required radiation density may for example be 100 microcuries per square centimetre.
- the charge pattern is induced on the paper by the field effect, as with conventional resin-impregnated paper, and the ionisation of the paper by the irradiation persists after the paper has left the region of the radio-active source, which is why it is possible to position the radio-active source either upstream (as at 52) or downstream (as at 54) of the backplane 28, by means of which the charge pattern is induced.
- the film as with known resin-impregnated paper, is generally of synthetic resin.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
- Elimination Of Static Electricity (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Developing Agents For Electrophotography (AREA)
Claims (15)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8604369 | 1986-02-21 | ||
GB08604369A GB2188590A (en) | 1986-02-21 | 1986-02-21 | Electrostatographic copying |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0234903A2 EP0234903A2 (de) | 1987-09-02 |
EP0234903A3 EP0234903A3 (en) | 1988-03-02 |
EP0234903B1 true EP0234903B1 (de) | 1990-06-20 |
Family
ID=10593468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870301547 Expired EP0234903B1 (de) | 1986-02-21 | 1987-02-23 | Elektrostatographisches Kopieren |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0234903B1 (de) |
DE (1) | DE3763344D1 (de) |
GB (1) | GB2188590A (de) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5535338A (en) * | 1978-09-01 | 1980-03-12 | Sharp Corp | Copying machine |
-
1986
- 1986-02-21 GB GB08604369A patent/GB2188590A/en not_active Withdrawn
-
1987
- 1987-02-23 DE DE8787301547T patent/DE3763344D1/de not_active Expired - Fee Related
- 1987-02-23 EP EP19870301547 patent/EP0234903B1/de not_active Expired
Also Published As
Publication number | Publication date |
---|---|
EP0234903A2 (de) | 1987-09-02 |
GB2188590A (en) | 1987-10-07 |
DE3763344D1 (de) | 1990-07-26 |
GB8604369D0 (en) | 1986-03-26 |
EP0234903A3 (en) | 1988-03-02 |
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Legal Events
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