WO2008101757A2 - Verfahren und anordnung zum erzeugen von nebeneinander auf einem bedruckstoff liegenden druckbildern mit hilfe einer elektrofotografischen druckeinrichtung - Google Patents
Verfahren und anordnung zum erzeugen von nebeneinander auf einem bedruckstoff liegenden druckbildern mit hilfe einer elektrofotografischen druckeinrichtung Download PDFInfo
- Publication number
- WO2008101757A2 WO2008101757A2 PCT/EP2008/050628 EP2008050628W WO2008101757A2 WO 2008101757 A2 WO2008101757 A2 WO 2008101757A2 EP 2008050628 W EP2008050628 W EP 2008050628W WO 2008101757 A2 WO2008101757 A2 WO 2008101757A2
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- WIPO (PCT)
- Prior art keywords
- image
- photoconductor
- toner
- exposure
- character generator
- Prior art date
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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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
- G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
-
- 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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
- G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
- G03G15/0157—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member with special treatment between monocolour image formation
-
- 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
- G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
- G03G15/0142—Structure of complete machines
- G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
- G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
- G03G15/0163—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member primary transfer to the final recording medium
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- 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
- G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
- G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
- G03G2215/017—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member single rotation of recording member to produce multicoloured copy
-
- 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
- G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
- G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
- G03G2215/0187—Multicoloured toner image formed on the recording member
Definitions
- a charge image carrier e.g. A photoconductive drum
- charge image carrier e.g. A photoconductive drum
- a toner cloud of toner particles is generated in the space between the developer roller (jump roller) and charge image carrier (hereinafter development area) by applying an AC voltage and / or DC voltage, pass from the toner particles according to the charge images on the charge image carrier and thus color this.
- Multi-color printing requires the charge images to be sequentially colored with toner particles of different colors.
- a corresponding number of developer stations can be arranged along the charge image carrier (US Pat. No.
- the problem underlying the invention is to provide a method in which already existing on the charge image carrier toner images, for example, at serial pressure, are not affected and subsequent developer stations are not contaminated. This problem is solved according to the features of claim 1 and claim 23.
- printing units are arranged on the same side, each having a character generator and a tribo-jump developer station, through which a charge image of a print image is generated on the photoconductor and this charge image is colored by a charged toner roll located at a bias voltage to the toner image by a bias voltage, there is a risk that a toner image formed by a first printing unit in the subsequent printing unit is damaged by toner of the first toner image is removed by toner of the subsequent printing unit and enters the developer station of the subsequent printing unit.
- the first printing unit generates a first charge image, which is developed to the first toner image of a first printed image and the subsequent second printing unit, a second charge image, which is developed to the second toner image of a second printed image.
- the solution is not limited to printing devices with two printing units, it can also be transferred to printing devices with more than two printing units.
- the risk of carryover of toner from a first toner image to the developer station of a subsequent printing unit can be reduced by virtue of the charge image (first toner image) developed by the first printing unit after leaving this printing unit and before reaching the next second printing unit. together with the photoconductor is reloaded by a recharging unit to a Umladepotential, which prevents the transfer of toner of the first toner image in the developer station of the second printing unit. As a result, the toner of the first toner image does not reach the developer station of the subsequent printing unit.
- the recharging potential may correspond to the initial potential of the photoconductor.
- Umladepotential is chosen in terms of magnitude greater than the initial potential of the photoconductor.
- the photoconductor with the first toner image is recharged by a first intermediate exposure unit prior to reimplementation and then charged to a recharging potential by the recharging unit which is greater than the initial potential, the adhesion of the first toner to the photoconductor is significantly increased Wan this toner largely suppressed in the developer station of the subsequent printing unit.
- This effect is further increased if the photoconductor is discharged into saturation by the first intermediate exposure unit, so that after the charge, the potential of the toner image is greater than the charge transfer potential of the photoconductor.
- the development of the second charge image by the subsequent printing unit can be improved by the fact that, before the next printing unit has been reached, after being transhipped by a second intermediate exposure unit, the photographic ter is discharged to a potential corresponding to the initial potential of the photoconductor.
- An optimum result is achieved when the character generator of the following printing unit is controlled in such a way that it places the region on the photoconductor in which the second charge image is to be formed at a potential which is optimal for the generation of the charge image.
- This can e.g. be the starting potential.
- This goal can be achieved in a first method if, after the transfer of the photoconductor by the transfer unit, the character generator of the subsequent second printing unit in an image area in which the first and the second print image is to be generated, the image area outside the first toner image In the image of the first charge image exposed and also generated in this image area, the charge image of the second print image on the photoconductor.
- the character generator of the second printing unit it is particularly advantageous if exposure is made to the inverse image of the first charge image by the character generator of the second printing unit only at the edge region of the second charge image.
- the exposure of the photoconductor to the inverse image of the first charge image can be regulated by means of a charge sensor arranged after the character generator.
- an area around the preceding toner image is excluded from the exposure.
- the inverse exposure can be performed as pointwise exposure, and the area around the preceding toner image can be adjustably excluded from the pointwise exposure.
- the exception of the pointwise exposure around the previous toner image may be a PEL.
- the intensity of the transhipment in the peripheral area can be determined by adjusting the intensity of the exposure of the LEDs of the character generator. Then, the generation of the second charge image is independent of the first toner image, moreover, printed images with fine characters and rasters can be better generated.
- adjacent print images which are arranged in such a way that a part of the toner image of the preceding print image projects into the edge region of the following print image, it is advantageous if the exposure by the character generator takes place in such a way that this part of the preceding toner image is not exposed becomes.
- Fig. 2 is a timing diagram showing, in principle, plotted over time the electric potential on a photoconductor when generating two serial printed images by two printing units without employing the invention
- Fig. 3 is a timing diagram corresponding to Fig. 2, illustrating the potential on the photoconductor when the photoconductor has been reloaded between the two printing units by the two printing units;
- Fig. 4 is a timing diagram corresponding to Fig. 2, illustrating the potential on the photoconductor when the photoconductor is overcharged during the transfer;
- FIG. 5 shows a pulse diagram corresponding to FIG. 2, which represents the potential on the photoconductor if the photoconductor has been exposed again before the transfer;
- Fig. 6 is a timing diagram corresponding to Fig. 2, illustrating the potential on the photoconductor when, after reloading, the photoconductor has been exposed once again to an intermediate exposure;
- Fig. 7 is a timing chart corresponding to Fig. 2 illustrating the potential on the photoconductor when the character generator of the second printing unit is controlled by a charge sensor;
- FIG. 8 shows a first printed image after inverse exposure with the first charge image
- FIG. 9 shows a representation of a first method with inverse exposure according to FIG. 8;
- FIG. 10 shows an advantageous improvement of the first method;
- FIG. 11 shows the first and second printed image in the case of inverse exposure of the second printed image only in its edge region;
- FIG. 12 shows an illustration of a second method for realizing the embodiment of FIG. 11;
- FIG. 13 shows a supplement to the second method
- FIG. 14 is a timing diagram corresponding to FIG.
- Fig. 15 is a control circuit for controlling the character generator of the second printing unit.
- FIG. 1 results in the basic structure of an e-lektrobibischen printing device.
- two printing units DE1 and DE2 are arranged around a photoconductor 1, in FIG. 1 a photoconductor belt, with which charge images colored with toner can be produced on the photoconductor 1, which are arranged in series with one another.
- the photoconductor 1 is moved in the direction of arrow 2.
- a cleaning unit RE which lies behind a transfer printing station US, in which the toner images are transferred to a printing material AT.
- Each printing unit DE1, DE2 has a character generator 4, 7 and a developer station 5, 8.
- character generator 4 e.g. an LED character generator can be used, which discharges the photoconductor 1 according to the images to be printed by exposure and thus generates charge images of the printed images, which are developed in a developer station.
- a developer station 5, 8 a working according to the Tribo Jump process developer station 5, 8 are used, whose operation is known and will be explained again below:
- the developer is fed to a jump roller 6, 9 as a developer roller, which takes over toner charged by the magnet roller.
- the toner is supplied to a developer gap formed between the jump roller 6, 9 and the photoconductor 1, where a toner cloud forms, from which toner passes to the photoconductor 1 in order to color the charge images there.
- a bias voltage a bias voltage, is applied to the jump roller 6, 9, the electric field forces between see jump roller 6, 9 and the charge images generated on the photoconductor 1, due to which charged toner is moved in the direction of the charge images.
- the photoconductor 1 is first charged by the charging unit 3 to an initial potential U a . Subsequently, the photoconductor 1 runs in the first printing unit DEI. There, the charged photoconductor 1 is exposed in accordance with the images to be printed by the first printing unit DEI (first printed images) by the character generator 4, so that first charge images LB1 of the first printed images to be printed are produced on the photoconductor 1. These charge images LB1 are colored in the first developer station 5 of the printing unit DE1 with toner to first toner images TB1.
- a charge sensor 10 can be provided between the character generator 4 and the developer station 5, by means of which the charge on the photoconductor 1 is measured and, depending on this, the exposure is controlled by the character generator 4 and the charging by the charging unit 3.
- the photoconductor 1 is exposed by the second character generator 7 in accordance with a second printed image to be printed, and the photoconductor 1 is discharged accordingly.
- the charge images LB2 generated by the second printing unit DE2 are adjacent to the first toner images TB1.
- the second charge images LB2 are developed by the second developer station 8 into second toner images TB2.
- the two toner images TB1, TB2 produced by the printing units DE1 and DE2 on the photoconductor 1 are in a known manner transferred to a printing material AT, eg paper, in a transfer printing station US and subsequently fixed in a known manner.
- a transfer unit 12 can be provided between the printing units DE1 and DE2 in order to recharge the photoconductor 1 behind the printing unit DE1.
- a first intermediate exposure unit 13 can be inserted between the first and second printing units DE1 and DE2 in order to be able to discharge the photoconductor 1. This intermediate exposure unit 13 may be located in front of the recharging unit 12.
- a further charge sensor 11 can be used, by whose measuring signal the exposure can be regulated by the second character generator 7 and the transhipment by the transhipment unit 12.
- a second intermediate exposure unit 14 can be arranged between the transfer unit 12 and the second printing unit DE2 in order to be able to expose the photoconductor 1 once more, depending on the application.
- FIGS. 2 to 7, 14 show pulse diagrams in which the course of the electrical potential on the photoconductor 1 during the production of printed images is plotted by the printing units DE1 and DE2 and this with different use of the units along the photoconductor 1.
- FIG in the exemplary embodiments it is assumed that the toner is negatively charged and the potentials on the photoconductor 1 are also negative.
- the invention can also be used with positively charged toner and positive potentials on the photoconductor 1.
- FIGS. 2 to 13 only show how two printed images of different colors are produced in succession and next to one another by the printing units DE1 and DE2.
- Fig. 14 shows the case that by a further printing unit (not shown in Fig. 1), a third
- Print image on the photoconductor 1 is generated.
- the photoconductor 1 is first charged to an initial potential U a , for example, to about -500V. Subsequently, the photoconductor 1 is discharged by the character generator 4 according to the image to be printed, for example, to a discharge potential Uei of, for example, about -40V. In the next step, the charge image LB1 produced in the developer station 5 is colored with toner T1 of a first color.
- the photoconductor 1 is moved on to the printing unit DE2. In the printing unit DE2, the photoconductor 1 adjacent to the toner image TB1 is exposed by the character generator 7 in accordance with the image to be printed and thereby discharged to the discharge potential U e i to the charge image LB2. Subsequently, the charge image LB2 in the developer station 8 is colored with toner T2 of another color to a toner image TB2.
- FIG. 2 The disadvantages of FIG. 2 are avoided in the invention by various measures, which are described below and which are used according to the desired quality of the printed images.
- a first measure can be explained in connection with FIG.
- the photoconductor 1 together with the toner image TB1 is once again charged by the recharging unit 12 to a recharging potential Uhi which corresponds, for example, to the initial potential U a , and also the toner images TB1 are correspondingly at the potential U t 2 raised.
- Uhi recharging potential
- U ti the potential of the toner image TB1 is more negative compared to the bias of the jump roller 9.
- the higher negative toner potential of the toner image TB1 increases the adhesion to the photoconductor 1 and the repulsive forces of the toner T1 become the toner T2 greater. The result is that less toner Tl is detached from the toner image TB1 in the developer station 8.
- a further improvement occurs when, as shown in FIG. 4, charging is effected by the transfer unit 12 of the photoconductor 1 to a transfer potential U h 2 and the first toner image TB1 to the potential U t 3, which is more negative than the initial potential U a (overcharge of the Toner image TBI).
- a more negative charge of the toner image TB1 is achieved, with the result that its adhesive force to the photoconductor 1 is increased.
- a larger potential difference of the first toner image TB1 to the toner T2 in the second developer station 8 (higher repulsive effect) is achieved, thus preventing a transfer of the toner T1 of the first toner image TB1.
- the photoconductor 1 for example, Uh2 about 870V are charged.
- the solution according to Fig. 4 has the disadvantage that the photoconductor 1 is overloaded and the development of the second toner image TB2 and thus the second print image DB2, especially in the reproduction of fine characters, is deteriorated. To prevent this, it is possible to proceed according to FIG. 5.
- the photoconductor 1 is exposed to a first intermediate exposure by the intermediate exposure unit 13 prior to its reloading and thereby further discharged in saturation to eg U e 2 ⁇ -20V, the potential of the toner image TB1 can be discharged eg to U t4 ⁇ -100V.
- the toner image TB1 is charged more negatively compared to the photoconductor 1; eg U h3 - 750V and U t5 ⁇ -800V.
- the overload of the photoconductor 1 is reduced.
- the consequence is also that the return transfer of toner Tl of the first toner image TB1 into the developer station 8 is prevented.
- a further improvement is achieved if, according to FIG. 6, the potential of the photoconductor 1 is further reduced while the potential of the first toner image TB1 is not changed.
- This can be achieved by exposing the photoconductor 1 to a second intermediate exposure through a second intermediate exposure unit 14 and discharging to a transfer potential Uh4 corresponding to the initial potential U a .
- the potential on the photoconductor 1 can be measured via a charge sensor 11 and the second intermediate exposure unit 14 are controlled so that the photoconductor 1 assumes the initial potential U a .
- FIG. 7 A solution for this case, Fig. 7 can be seen.
- the toner image TB1 is reloaded by the transfer unit 12 to the potential U ts , the potential of the photoconductor 1 is then Uhs.
- the second character generator 7 is controlled so that it sets the photoconductor 1 to the Umladepotential U h 6 for the generation of the second toner image TB2 eg at initial potential U a .
- the character generator 7 can be controlled in different ways and thereby different results can be achieved. The procedures carried out in this case are explained with reference to the figures 8 to 13.
- an image area BB is used, in which two print images are to be generated side by side.
- the charge image LB1 for the first print image is first generated by the character generator 4, and this is developed into the toner image TB1 in the developer station 5.
- the charge image LB2 for the second print image is generated by the character generator 7 and developed in the developer station 8 to the toner image TB2.
- the character generator 7 is activated in such a way that it is displayed in an image area BB in which the first and the second image areas BB1, TB1 and TB2 are identical second print image to be exposed to the area outside the first toner image TBI with the inverse image of the first charge image LBl.
- the second toner image TB2 as described in Fig. 6, generated and to discharge the photoconductor 1 to about -40V. This inverse exposure results in principle from FIG.
- FIGS. 9a to 9c show the image area BB in a basic representation.
- the image area BB is divided into squares, which can be exposed pointwise, for example, with an LED character generator.
- Each pixel which is generated by an LED of the LED character generator 7 discharges the photoconductor 1 pointwise to a PEL (printed element) on the photoconductor 1, which forms the printing dot (dot) colored with toner.
- the LED's of the LED character generator 7 may be driven in a known manner to selectively generate individual PEL's (in the squares) by exposure.
- the toner image TB1 is represented by four PELs, for example.
- Fig. 9a shows the potential relationships after development in the developer station 5 (Fig. 7). In the shaded area, the potential U a is present, the potential U t 4 in the toner area TB1.
- the image area BB is now raised to the potential U h s by the recharging unit 12 after the recharging
- FIG. 7 is exposed by the character generator 7 to the inverse charge image LB1 and at the same time the charge Image LB2 is generated ( Figure 9b).
- the area of the inverse exposure is discharged from the potential Uhs to the potential Uh ⁇ , for example U a , while the toner image TB1 is not influenced. This thus remains at the potential while the toner image TB2 is set to the potential U t s.
- 9c shows the image area BB, in which the two toner images TB1 and TB2 (in each case squares of four PELs) lie next to one another.
- To the toner images TBL and TB2 is the image region at the potential U • In the first method of FIG.
- FIG. 10c the two toner images TB1 and TB2 are next to each other, the area BT around the toner image TB1 is at the potential U h5 , the potential of the remaining image area BB except the toner image TB2 is at U h6 .
- the exposure to the inverse first charge image LB1 is performed only in an edge region RB of the second charge image LB2 (FIG. 11).
- FIG. 11 the exposure to the inverse first charge image LB1 is performed only in an edge region RB of the second charge image LB2
- an image area BB in which the first toner image TB1 and the second toner image TB2 are juxtaposed and only the peripheral area RB has been exposed to the toner image TB2 by the character generator 7.
- the edge area RB can be exposed by this pointwise.
- Each pixel which is generated by an LED of the LED character generator 7 discharges the photoconductor 1 pointwise to a PEL (prin- ted element) which forms the printing dot (dot) with toner inked.
- the LED 's of the LED character generator 7 can be controlled in a known manner so that they selectively generate individual PELs by exposure in the edge region RB and thus discharges the edge region RB adjustable.
- the width of the peripheral area RB can be adjusted, by adjusting the intensity of the exposure, the amount of discharge.
- This method has the advantage that there is no influence of the first toner image TB1 on the following toner image TB2.
- the photoconductor 1 can be discharged specifically to a charge potential U h6 , which enables optimal development of the charge images LB2.
- the charge potential Uh6 can be set to the initial potential U a .
- FIGS. 12a to 12c This second method is illustrated in FIGS. 12a to 12c.
- Fig. 12a corresponds to Fig. 9a, - it is referred to.
- FIG. 12b shows the exposure of the image area BB by the character generator 7; FIG. this is such that the edge region RB is discharged around the charge image LB2 to the potential U h 6, the remaining image region BB on the other hand remains at the potential Uhs.
- Other widths of the edge area RB are of course possible.
- the edge region RB consists of the second charge image LB2 of two PELs. The result is shown in FIG. 12c.
- the two toner images TB1 and TB2 are next to each other; the edge area RB around the toner image TB2 lies at the potential Uh6 / the remaining image area BB at the potential U h s •
- a part of the toner image TB1 lies within the edge area RB as an example.
- the character generator 7 By the exposure of the edge area RB by the character generator 7, the toner image TB1 at its periphery may be affected as well, with the result that the toner T1 migrates into the developer station 8.
- an exposure of the edge region RB of the charge image LB2 can be carried out by the character generator 7 according to FIG. Fig. 13a again corresponds to Fig. 9a, - it is referred to.
- the exposure by the character generator 7 results
- Fig. 13b The area of the toner image TB1 lying in the peripheral area RB is excluded from the exposure. However, care is taken to ensure that discharge around the charge image LB2 remains at the potential U hs . For example, when an exposure by the character generator 7 around the charge image LB2 occurs with two PELs, and the toner image TBl protrudes into a region of one PEL in the peripheral region RB of two PELs, a region of one PEL between the charge image LB2 and the toner image becomes TBI exposed by the character generator 7. Toner removal on the toner image TB1 is then minimized.
- the methods according to the invention thus make it possible to deliberately avoid the disadvantages caused by the fact that the first toner image TB1 passes through the second developer station 8 by means of the specified measures.
- An optimal solution is achieved when the toner image TBI ü- Overload and thus higher adhesive forces to the photoconductor 1 and at the same time a higher repellent effect to the toner T2, which is used in the second developer station 8, is developed.
- the character generator 7 Via a charge sensor 11, the character generator 7 can be controlled so that the photoconductor 1 is transferred to an optimum development potential, for example the initial potential.
- FIG. 14 shows the timing chart of an example in which three printing units are arranged along the photoconductor 1.
- the first region corresponds to the course of FIG. 7 (up to the dashed vertical line), then the potential curve is shown when the third printing unit (not shown in FIG. 1) generates a toner image TB3 for a third printed image on the photoconductor 1.
- a transfer unit 16 a transhipment comparable to that of Fig. 7 (Umladestatt 12).
- the photoconductor 1 is discharged by a character generator 17 corresponding to the third print image to a charge image LB3 and developed in a developer station of the third printing unit to the toner image TB3.
- the sequence and the potential conditions correspond to those of FIG. 7; it is referred to.
- printed images lying in series on the same principle can be produced by further printing units.
- a principle circuit of a control circuit e.g. for the character generator 7.
- the charge of the photoconductor 1 is measured by a charge sensor 11.
- the measurement signal is compared in a comparison circuit VG with a discharge target value SW.
- the resulting control difference RD is sent to a discharge controller RG, e.g. a PI controller, which controls the character generator 7 so that it sets the desired potential (for example, as shown in Fig. 7) on the photoconductor 1.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Color Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Combination Of More Than One Step In Electrophotography (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2009550256A JP4988868B2 (ja) | 2007-02-22 | 2008-01-21 | 電子写真印刷装置を用いて被印刷物上に隣接する印刷画像を形成するための方法 |
DE112008000291.6T DE112008000291B4 (de) | 2007-02-22 | 2008-01-21 | Verfahren zum Erzeugen von nebeneinander auf einem Bedruckstoff liegenden Druckbildern mit Hilfe einer elektrofotografischen Druckeinrichtung |
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DE200710008801 DE102007008801A1 (de) | 2007-02-22 | 2007-02-22 | Verfahren zum Erzeugen von nebeneinander auf einem Bedruckstoff liegenden Druckbildern mit Hilfe einer elektrofotografischen Druckeinrichtung |
DE102007008801.0 | 2007-02-22 | ||
DE102007033238.8 | 2007-07-17 | ||
DE200710033238 DE102007033238A1 (de) | 2007-07-17 | 2007-07-17 | Verfahren zum Erzeugen von nebeneinander auf einem Bedruckstoff liegenden Druckbildern mit Hilfe einer elektrofotografischen Druckeinrichtung |
DE200710047158 DE102007047158A1 (de) | 2007-10-02 | 2007-10-02 | Verfahren und Anordnung zum Erzeugen von nebeneinander auf einem Bedruckstoff liegenden Druckbildern mit Hilfe einer elektrofotografischen Druckeinrichtung |
DE102007047158.2 | 2007-10-02 |
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WO2008101757A2 true WO2008101757A2 (de) | 2008-08-28 |
WO2008101757A3 WO2008101757A3 (de) | 2008-10-16 |
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JP (1) | JP4988868B2 (de) |
DE (1) | DE112008000291B4 (de) |
WO (1) | WO2008101757A2 (de) |
Citations (5)
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US5438401A (en) * | 1991-12-09 | 1995-08-01 | Ricoh Company, Ltd. | Multicolor image forming method and apparatus therefor |
US5579100A (en) * | 1994-12-23 | 1996-11-26 | Xerox Corporation | Single positive recharge method and apparatus for color image formation |
JPH10186831A (ja) * | 1996-12-24 | 1998-07-14 | Canon Inc | 多色画像形成装置 |
US5828933A (en) * | 1997-11-24 | 1998-10-27 | Xerox Corporation | Additive color recharge, expose, and develop electrophotographic printing |
JP2002023521A (ja) * | 2000-07-11 | 2002-01-23 | Toshiba Corp | 電子写真記録方法 |
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EP0143535B1 (de) * | 1983-10-03 | 1990-12-27 | Konica Corporation | MI-Vielfach-Bild-Reproduktionsverfahren |
US4868600A (en) * | 1988-03-21 | 1989-09-19 | Xerox Corporation | Scavengeless development apparatus for use in highlight color imaging |
US5258820A (en) * | 1992-07-29 | 1993-11-02 | Xerox Corporation | Pre-recharge device for voltage uniformity in read color systems |
JPH0882971A (ja) * | 1994-09-09 | 1996-03-26 | Canon Inc | 多色画像形成装置 |
JPH1026859A (ja) * | 1996-07-10 | 1998-01-27 | Canon Inc | 多色画像形成装置 |
JPH10161398A (ja) * | 1996-12-04 | 1998-06-19 | Canon Inc | 多色画像形成装置 |
US6970662B2 (en) * | 2003-12-22 | 2005-11-29 | Xerox Corporation | Systems and methods for in situ setting charge voltages in a dual recharge system |
-
2008
- 2008-01-21 JP JP2009550256A patent/JP4988868B2/ja not_active Expired - Fee Related
- 2008-01-21 DE DE112008000291.6T patent/DE112008000291B4/de not_active Expired - Fee Related
- 2008-01-21 WO PCT/EP2008/050628 patent/WO2008101757A2/de active Application Filing
Patent Citations (5)
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US5438401A (en) * | 1991-12-09 | 1995-08-01 | Ricoh Company, Ltd. | Multicolor image forming method and apparatus therefor |
US5579100A (en) * | 1994-12-23 | 1996-11-26 | Xerox Corporation | Single positive recharge method and apparatus for color image formation |
JPH10186831A (ja) * | 1996-12-24 | 1998-07-14 | Canon Inc | 多色画像形成装置 |
US5828933A (en) * | 1997-11-24 | 1998-10-27 | Xerox Corporation | Additive color recharge, expose, and develop electrophotographic printing |
JP2002023521A (ja) * | 2000-07-11 | 2002-01-23 | Toshiba Corp | 電子写真記録方法 |
Also Published As
Publication number | Publication date |
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DE112008000291A5 (de) | 2010-04-22 |
JP2010519580A (ja) | 2010-06-03 |
WO2008101757A3 (de) | 2008-10-16 |
JP4988868B2 (ja) | 2012-08-01 |
DE112008000291B4 (de) | 2014-11-20 |
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