EP0890142B1 - Elektrofotografisches druckverfahren zum bedrucken eines trägers - Google Patents
Elektrofotografisches druckverfahren zum bedrucken eines trägers Download PDFInfo
- Publication number
- EP0890142B1 EP0890142B1 EP97920508A EP97920508A EP0890142B1 EP 0890142 B1 EP0890142 B1 EP 0890142B1 EP 97920508 A EP97920508 A EP 97920508A EP 97920508 A EP97920508 A EP 97920508A EP 0890142 B1 EP0890142 B1 EP 0890142B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- image
- printing
- photoconductor
- carrier
- 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 - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G13/00—Electrographic processes using a charge pattern
- G03G13/04—Exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
- G03G13/045—Charging or discharging distinct portions of the charge pattern on the recording material, e.g. discharging non-image areas, contrast enhancement
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G13/00—Electrographic processes using a charge pattern
- G03G13/22—Processes involving a combination of more than one step according to groups G03G13/02 - G03G13/20
Definitions
- the invention relates to an electrophotographic printing process according to claims 1 to 13 for printing on a support in which a photosensitive Layer system with an electrode layer, an insulating one Top layer and one between electrode layer and Cover layer arranged photoconductor layer by stamping an electric field of a first direction in one homogeneous initial state is brought.
- the photoconductor layer is through the cover layer or through the electrode layer through with pictorial structures exposed, the layer system a second electrical Field is impressed in the opposite direction, so that a charge pattern in and on the layer system corresponding to the Image structures arise.
- the entire photoconductor layer is then through the cover layer and / or through the electrode layer exposed evenly so that on the Surface of the top layer corresponding to the picture structures Potential picture emerges. After that, cover the top layer toner particles charged in a development step applied, which according to the potential image as a toner image deposit, which is then transferred to the carrier becomes.
- US-A-4,444,859 describes electrophotographic processes explained in which after an imagewise exposure of a photosensitive layer system n-copies of the image printed without being exposed again in the meantime becomes.
- the layer systems which are an upper insulating layer, a Contain photoconductor layer and a lower electrode layer, ensure that the mechanically sensitive photoconductor through the upper insulating layer during the development process is protected.
- the structure of the layer system or the influence of the layer system on the print quality is not described. Described becomes a technology of n-edition printing, in which a Toner image is fixed on the photoconductor drum.
- DE-A-27 41 713 relates to a method and an apparatus to stabilize an electrostatic charge pattern, where the stabilization by choosing a suitable one Potential for generating the charge image is achieved.
- US-A-5,053,304 describes a layer system for electrophotographic n-run printing without intermediate exposure explained.
- This task is for a method of the aforementioned Art solved in that with a print run greater than 1 the development step and the transfer step several times below Preservation of the existing inside the layer system electrical charge pattern are carried out.
- the invention is based on the knowledge that electrophotographic Proven procedures, but on condition greater than 1 an insufficient printing speed have an exposure but especially with a print run larger than 1 in principle only has to be done once, since the picture structures are the same for each print of the edition. Therefore be in a printing method according to the invention in one edition greater than 1 the development step and the transfer step several times while maintaining the inside of the layer system existing charge pattern executed. In particular, not applicable imagewise exposing, even exposing and one Establishing the homogeneous initial state. This allows the Print speed is essential for a print run greater than 1 increase. In addition, the print increases with one run 1 performed with lower energy consumption because the mentioned steps are omitted.
- the Development step and the transfer step several times executed immediately in succession.
- the charge pattern is located inside the layer system in one embodiment of the invention between the cover layer and photoconductor layer.
- the charge pattern is in deep traps localized. That means practical no lateral shifting of the load can occur. Even when using conductive substances, e.g. liquid Toner, there is no so-called image blurring. In addition, this charge pattern remains practical when exposed to light unchanged. The result is that a high limit circulation can be achieved up to which the print images of an edition are of sufficiently good quality.
- the printing method according to the invention is preferably in one High performance printer used. With a controller can between a print with edition 1 and a print with edition greater than 1 can be switched. When printing with a print run the printing speed becomes greater than 1 according to the above through an appropriate control of the printing process significantly increased.
- the imagewise exposure just before or at the beginning of the imprint of the second electric field takes place line by line according to the Image structure controlled LED line or by an according of the image structures modulated laser beam, so that a digital Pressure is performed.
- an intermediate carrier is used as the carrier, from which the Toner image in a further transfer step sheet material, e.g. Paper that is transferred can the wear of the layer system can be reduced since the Intermediate carrier can be made from one material, which the cover layer only when transferring the toner image little mechanical attack.
- the invention also relates to an electrophotographic Printer with the features of claim 14.
- the above The effects mentioned also apply analogously to the electrographic Printer according to the invention.
- the electrographic Printer according to the invention combines the advantages of the known electrophotographic printing and offset printing there he without electronic mask preparation one in electronic form available print information with the edition 1 and variable Print content from page to page at the speed of one known electrographic printer print or optionally with a circulation greater than 1 with a clearly increased Print speed prints at the print speed of offset printing is comparable.
- the layer system used in the invention can be a Form a plane or a curved surface. Besides, that can Layer system optionally made of a flexible or rigid Material.
- FIG. 1 shows a schematic diagram of an electrographic Printer 10 with essential electrical and mechanical Functional units.
- the printer 10 has one through a motor 12 transport device 16 driven by a shaft 14, which is arranged near a transfer station 18 and endless carrier material 20 at the transfer station 18 essentially transported past according to a predetermined printing speed VD.
- a change in transport also printed single sheets become.
- the transfer station 18 is on a photoconductor drum 22 applied, toner-colored charge image by means of a corona device (not shown) on the carrier material 20 transferred.
- the photoconductor drum 22 rotates doing so in the direction of an arrow 24.
- any residual toner in an eraser 26 removed and a residual charge image in a photoconductor layer on the photoconductor drum 22 may be deleted.
- the activation of the extinguishing device 26 depends on whether the printer 10 is in a first operating state I or is in a second operating state II.
- In the operating state I operates the printer 10 like a known electrographic Printer in which the print image changes from print image to print image Print information can be printed.
- In the operating state II will be a single print specification with one edition printed larger than 1.
- the photoconductor drum 22 is in contrast for operating status I only once per edition an exposure line 28 of LED diodes in accordance with the image exposed to a given image structure. This process is explained in more detail below with reference to FIG. 3. Subsequently the photoconductor drum is exposed evenly 22 by an exposure device, not shown. Through the two exposure steps and the one below explained influence of external electrical fields arises a potential image on the surface of the photoconductor drum 22, that corresponds to the image structures.
- the photoconductor drum 22 continues to rotate, it becomes hers Surface in both operating states I and II on one Developer station 30 passed.
- the developer station 30 are loaded according to a known method Applied toner particles.
- the carrier material 20 After the carrier material 20 is transported past the transfer station 18 , it will be in both operating states I and II fed to a fuser 32 in which the still smearable toner image in the carrier material with the help of Pressure and temperature is melted smudge-proof.
- a first deflection unit 36 In the seen by an arrow 34 indicated transport direction in front of the transfer station 18 is a first deflection unit 36 arranged which the carrier material 20 of the transfer printing station 18th feeds.
- a second deflection unit 38 is in the transport direction seen after the fixing station 32 arranged. This second deflection unit 38 stacks the printed carrier material 20 on a stack 40.
- the carrier material 20 is at the beginning the printing process from a stack 42 by the first deflection unit 36 taken. Instead of the two stacks 40 and 42 rolls are also used on which the carrier material 20 is rolled up.
- the printing process is controlled by a print controller 44, which contains a microprocessor 46 and a memory 47.
- the microprocessor 46 operates a stored in the memory 47 Print program.
- the print controller 44 outputs the image structures before and transmits those belonging to these image structures Image signals via a bus system 48 to the exposure line 28.
- In operating state I are when printing each one Print image by the print controller 44 new image signals transfer.
- the motor 12 is connected via a control line 50 controlled by the pressure controller 44 so that it is one in Lower speed compared to operating mode II Has.
- the pressure control 44 can also be used With the help of a gear, not shown, the transport speed of the carrier material 20 in the operating state I be reduced.
- operating state II the motor 12 is accordingly controlled that the carrier material 20 has a higher transport speed has as in operating state I.
- the Exposure line 28 in operating state II only for exposure used in the first print of the edition.
- the extinguishing device 26 is not used in operating state II because the charge image in the photoconductor layer of the photoconductor drum is preserved over the entire print run.
- the pressure controller 44 is connected to a via data lines 52 Input / output device 54 connected, among other things, the one you want Operating state I or II specified by an operator can be.
- FIG. 2 shows a photosensitive layer system 70 which is applied to the photoconductor drum 22.
- the layer system 70 contains an insulating cover layer 72 made of a transparent material, an underlying photoconductor layer 74, e.g. from a flexible organic photoconductor N-type (OPC), and a lower electrode layer 76 made of a sufficiently conductive material, e.g. Copper.
- OPC organic photoconductor N-type
- a greatly enlarged boundary layer 78 is shown in FIG.
- a barrier layer 80 is shown between the photoconductor layer 74 and the electrode layer 76.
- the boundary layer 78 and the barrier layer 80 form in the respective Edge areas of the photoconductor layer 74.
- Figure 3 shows a schematic representation of the charge images and the potential images in the layer system 70 during the printing process, which is used in printer 10 to generate the charge image becomes.
- the charge pattern is in and on the layer system 70 for three steps A, B and C. shown.
- step A the layer system is charged 70 carried out
- step B a reload and an imagewise exposure is carried out
- step C uniform exposure of the layer system 70 is carried out.
- Fig. 3b the potentials on the surface of the Layer system 70 in each of steps A to C for bright and dark picture structures shown. Is on the abscissa axis the time t is ablated and is on the ordinate axis the potential P is removed.
- step A the on the photoconductor drum is charged 22 applied layer system 70 by a not corona device shown.
- the layer system is thereby brought into a homogeneous initial state.
- This State are on the surface of the insulating Cover layer 72 positive charge carriers that are evenly distributed are.
- the Potential course on the surface of the cover layer 72 is such that during the time of step A, the between a time t0 and t1 is performed, a positive Potential that builds up the tension of the corona device approximates.
- step B a transhipment takes place and simultaneous imagewise exposure of the layer system 70 through the LEDs of the exposure line 28, with the help of a further corona device an electric field on the Layer system 70 is impressed, which is an opposite Has polarity, like the electric field in step A.
- An darkened areas of the layer system 70 is a transshipment complicated by the further corona device, since the photoconductor layer 74 has a high resistance in the dark.
- step C the entire exposure is uniform Layer system 70 in the longitudinal axis of the photoconductor drum 22 for a streak by blasting 92.
- the even exposure can e.g. through another exposure line in which all LEDs are uniform Have brightness.
- the entire photoconductor layer is formed by the uniform exposure 74 low impedance. In the areas already in Step B were illuminated, the charge pattern changes in the Layer system 70 does not. In the darkened in step B. Areas takes place due to the changed properties of the now there also a low-resistance photoconductor layer 74, as a result, the positive charge carriers of the electrode layer 76 penetrate into the photoconductor layer 74 and at least part of the negative there Neutralize charge carriers.
- the potential picture on the surface cover layer 72 is again in part b of FIG. 3 shown. The charge is balanced out of potential in the dark areas. This results in a potential difference D between light and dark areas. This potential difference causes the charged Toner particles only in the areas illuminated in step B. adhere to the surface of the cover layer 72.
- the charge distribution remains inside of the layer system 70 via a multiplicity of printing processes, in each of which an entire print image is printed on the carrier material 20 is printed, essentially unchanged.
- Figure 4 shows a flow diagram of the method according to the invention in operating state II of the printer 10.
- a printing cycle is started for a print run N, e.g. an operator via the input / output device 54 sets operating state II and inputs a start signal.
- a step 102 the microprocessor 46 Image data for image elements of a print image in the memory 47 saved.
- a step 104 the operator the number of copies N is fixed, whereby in operating state II the print run N is greater than 1.
- step 106 the corona device for charging the Layer system 70 activated according to step A (step 106).
- step 108 the layer system 70 is reloaded and simultaneously through the exposure line 28 according to the specifications the pressure controller 44 exposed.
- step 110 by another exposure line in the direction of rotation 22 Photoconductor drum seen behind exposure line 38 one uniform exposure of the layer system 70 according to step C carried out.
- Step 112 a counter for counting the printed images of the respective edition set to zero (Step 112).
- Toner is applied to the photoconductor drum 22 (step 114).
- the transfer then takes place at the transfer printing station 18 of the toner image on the carrier material 20, which is in the fixing station 32 is fixed (step 116).
- the length of a printed image in the transport direction 34 is through limits the size of the photoconductor drum 22. No later than after the photoconductor drum 22 one turn with activated Exposure line 28 has performed the corona device to charge the photoconductor according to step A, the exposure line 28 and the exposure line for uniform Exposure no longer activated. Steps 114, 116 and a step 118 can take place without the influence of the pressure control 44 are carried out when the counting process is carried out by a separate counter is carried out when a Counter reading, which corresponds to the edition N, the Pressure control 44 reactivated.
- the speed is reduced the photoconductor drum 22 still by the pressure control 44 significantly increased, since in particular the imagewise exposure step when printing the other print images of the edition not applicable.
- the extinguishing device 26 is in operating state 2 only activated if another edition is to be printed.
- a step 118 it is checked whether the counter has a value that corresponds to the edition height N. Is not this the case, the counter value is in a step 120 by the Value 1 increases and the process loops from the Steps 114 through 120 continued. If it is determined in step 118 that the counter has a counter value that matches the Edition N corresponds, i.e. all prints of the Edition has already been printed, so will the edition print ended in a step 122.
- the printing method according to the invention achieves that in operating state II a printing speed of over 1000 pages per minute is reached.
Description
- Figur 1
- eine Prinzipdarstellung eines elektrografischen Druckers mit wesentlichen elektronischen und mechanischen Funktionseinheiten,
- Figur 2
- eine schematische Darstellung eines fotoempfindlichen Schichtsystems,
- Figur 3
- eine schematische Darstellung des Ladungsbildes und des Potentialbildes in der fotoempfindlichen Schicht, und
- Figur 4
- ein Flußdiagramm des Druckverfahrens nach der Erfindung.
Claims (14)
- Elektrofotografisches Druckverfahren zum Bedrucken eines Trägers (20),bei dem ein fotoempfindliches Schichtsystem (70) mit einer Elektrodenschicht (76), einer isolierenden Deckschicht (72), einer zwischen Elektrodenschicht (76) und Deckschicht (72) angeordneten Fotoleiterschicht (74), einer zwischen Fotoleiterschicht (74) und Elektrodenschicht (76) angeordneten Sperrschicht (80) sowie mit einer zwischen Fotoleiterschicht (74) und Deckschicht (72) angeordneten Zwischenschicht (78) mit tiefen Haftstellen für Ladungsträger durch Aufprägen eines elektrischen Feldes einer ersten Richtung in einen homogenen Anfangszustand gebracht wird (Schritt A; 106),die Fotoleiterschicht (74) durch die Deckschicht (72) oder durch die Elektrodenschicht (76) hindurch bildmäßig mit vorgegebenen Bildstrukturen belichtet wird (Schritt B; 108),wobei dem Schichtsystem (70) ein zweites elektrisches Feld mit entgegengesetzter Richtung aufgeprägt wird,so daß im und auf dem Schichtsystem (70) ein Ladungsbild entsprechend den Bildstrukturen entsteht,die gesamte Fotoleiterschicht (74) durch die Deckschicht (72) und/oder durch die Elektrodenschicht (76) hindurch gleichmäßig belichtet wird (Schritt C; 110), so daß auf der Oberfläche der Deckschicht (72) ein den Bildstrukturen entsprechendes Potentialbild entsteht,auf die Deckschicht (72) in einem Entwicklungsschritt (Schritt 114) geladene Tonerteilchen aufgebracht werden, die sich gemäß dem Potentialbild als Tonerbild ablagern,das Tonerbild anschließend auf den Träger (20) übertragen wird (Schritt 116),und bei dem bei einer Auflage größer 1 der Entwicklungsschritt und der Übertragungsschritt mehrfach unter Beibehaltung des im Inneren des Schichtsystems vorhandenen elektrischen Ladungsbildes ausgeführt werden (Schritt 114 bis 120).
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Entwicklungsschritt (114) und der Übertragungsschritt (116) mehrfach zeitlich unmittelbar aufeinanderfolgend ausgeführt werden.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß beim Aufbringen der Tonerteilchen das Ladungsbild im Inneren des Schichtsystems (70) im wesentlichen unverändert erhalten bleibt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß beim Aufbringen der Tonerteilchen ein Luftspalt zwischen Deckschicht (72) und einem Tonerteilchenträger zum Aufbringen der Tonerteilchen vorhanden ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß beim Übertragen des Tonerbildes das Ladungsbild im Inneren des Schichtsystems (70) im wesentlichen unverändert erhalten bleibt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Verfahren in einem Hochleistungsdrucker (10) eingesetzt wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß eine Steuerung (44) zwischen einem ersten Betriebszustand I zum Druck mit Auflage 1 und einem weiteren Betriebszustand II zum Druck mit Auflage größer 1 umschaltet.
- Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß im Betriebszustand II eine Druckgeschwindigkeit VD, zumindest beim Druck der auf ein erstes Druckbild einer Auflage folgenden Druckbilder derselben Auflage im Vergleich zur Druckgeschwindigkeit im Betriebszustand I wesentlich erhöht wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Ladungsbild im Inneren des Schichtsystems (70) zwischen Deckschicht (72) und Fotoleiterschicht (74) angeordnet ist.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß als Toner ein Flüssigkeitstoner oder ein Tonerpulver verwendet wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die bildmäßige Belichtung kurz vor oder am Anfang des Aufprägens des zweiten elektrischen Feldes durchgeführt wird.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die bildmäßige Belichtung zeilenweise, vorzugsweise durch eine gemäß den Bildstrukturen angesteuerte LED-Zeile (28) oder durch einen gemäß der Bildstrukturen modulierten Laserstrahl erfolgt.
- Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Träger (20) aus blattförmigem Material besteht oder das der Träger ein Zwischenträger ist, von dem aus das Tonerbild in einem weiteren Übertragungsschritt auf ein blattförmiges Material, vorzugsweise Papier, übertragen wird.
- Elektrofotografischer Drucker zum Durchführen des Verfahrens nach einem der Ansprüche 1 bis 14,mit einer Steuerung (44) zum Steuern des Druckvorgangs,einer Transporteinrichtung (16) zum Transportieren eines Trägers (20),einem fotoempfindlichen Schichtsystem (70) mit einer Elektrodenschicht (76), einer isolierenden Deckschicht (72) und mit einer zwischen Elektrodenschicht (76) und Deckschicht (72) angeordneten Fotoleiterschicht (74),einer Koronaentladungseinrichtung zum Herstellen eines homogenen Anfangszustandes des Schichtsystems (70) durch Aufprägen eines elektrischen Feldes einer ersten Richtung,einer Belichtungseinrichtung zum bildmäßigen Belichten der Fotoleiterschicht (74) gemäß durch die Steuerung (44) vorgegebener Bildstrukturen,wobei dem Schichtsystem (70) ein zweites elektrisches Feld mit entgegengesetzter Richtung aufgeprägt wird,einer weiteren Belichtungseinrichtung zum gleichmäßigen Belichten des Schichtsystems (70),einer Entwicklereinrichtung zum Aufbringen geladener Tonerteilchen auf die Oberfläche der Deckschicht (72),und mit einer Umdruckstation (18) zum Übertragen eines aus den Tonerteilchen gebildeten Tonerbildes auf den Träger (20), wobei der Träger (20) durch das Transportsystem an der Umdruckstation (18) vorbeitransportiert wird,daß die Transporteinrichtung (16) den Träger mit einer ersten Geschwindigkeit (VD) im Betriebszustand I und einer die erste Geschwindigkeit (VD) übersteigenden Geschwindigkeit im Betriebszustand II transportiert,und daß das fotoempfindliche Schichtsystem zwischen Fotoleiterschicht (74) und Elektrodenschicht (76) eine Sperrschicht sowie zwischen Fotoleiterschicht (74) und Deckschicht (72) eine Zwischenschicht (78) mit tiefen Haftstellen für Ladungsträger enthält.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19612762 | 1996-03-29 | ||
DE19612762 | 1996-03-29 | ||
PCT/DE1997/000510 WO1997037286A1 (de) | 1996-03-29 | 1997-03-13 | Elektrofotografisches druckverfahren zum bedrucken eines trägers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0890142A1 EP0890142A1 (de) | 1999-01-13 |
EP0890142B1 true EP0890142B1 (de) | 2001-12-19 |
Family
ID=7789996
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97920508A Expired - Lifetime EP0890142B1 (de) | 1996-03-29 | 1997-03-13 | Elektrofotografisches druckverfahren zum bedrucken eines trägers |
Country Status (4)
Country | Link |
---|---|
US (1) | US6162570A (de) |
EP (1) | EP0890142B1 (de) |
DE (1) | DE59705891D1 (de) |
WO (1) | WO1997037286A1 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8017293B2 (en) * | 2007-04-09 | 2011-09-13 | Hewlett-Packard Development Company, L.P. | Liquid toner-based pattern mask method and system |
US8029964B1 (en) | 2007-07-20 | 2011-10-04 | Hewlett-Packard Development Company, L.P. | Polymer-based pattern mask system and method having enhanced adhesion |
KR20180115676A (ko) | 2016-02-26 | 2018-10-23 | 앰코어 플렉서블스 셀레스타 사스 | 열적으로-안정적인 프린트들을 포함하는 가요성 패키징 기재들 |
US11376831B2 (en) | 2016-03-18 | 2022-07-05 | Amcor Flexibles Selestat Sas | Flexible laminate for printed retort packaging |
EP3714331A4 (de) * | 2018-04-30 | 2021-01-06 | Hewlett-Packard Development Company, L.P. | Elektrofotografisches drucken |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124456A (en) * | 1958-10-30 | 1964-03-10 | figure | |
US3457070A (en) * | 1964-07-25 | 1969-07-22 | Matsuragawa Electric Co Ltd | Electrophotography |
US4071361A (en) * | 1965-01-09 | 1978-01-31 | Canon Kabushiki Kaisha | Electrophotographic process and apparatus |
DE1797579C3 (de) * | 1965-07-12 | 1978-06-29 | Canon K.K., Tokio | Elektrophotographieverfahren |
JPS4925218B1 (de) * | 1968-09-21 | 1974-06-28 | ||
US3821931A (en) * | 1971-03-04 | 1974-07-02 | Canon Kk | Copying-printing apparatus |
JPS6040024B2 (ja) * | 1976-09-17 | 1985-09-09 | キヤノン株式会社 | 静電潜像安定化方法 |
JPS6027026B2 (ja) * | 1977-06-17 | 1985-06-26 | キヤノン株式会社 | 電子写真方法及び装置 |
JPS57105755A (en) * | 1980-12-24 | 1982-07-01 | Canon Inc | Image forming device |
US4444859A (en) * | 1981-05-30 | 1984-04-24 | Olympus Optical Company Limited | Electrophotographic process and photosensitive member for use in said process |
US5053304A (en) * | 1989-12-27 | 1991-10-01 | Eastman Kodak Company | Photoconductor element for making multiple copies and process for using same |
-
1997
- 1997-03-13 EP EP97920508A patent/EP0890142B1/de not_active Expired - Lifetime
- 1997-03-13 DE DE59705891T patent/DE59705891D1/de not_active Expired - Fee Related
- 1997-03-13 US US09/117,929 patent/US6162570A/en not_active Expired - Fee Related
- 1997-03-13 WO PCT/DE1997/000510 patent/WO1997037286A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
EP0890142A1 (de) | 1999-01-13 |
US6162570A (en) | 2000-12-19 |
DE59705891D1 (de) | 2002-01-31 |
WO1997037286A1 (de) | 1997-10-09 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2951460C2 (de) | Elektrographisches Verfahren und Vorrichtung zur Durchführung eines elektrographischen Verfahrens | |
DE2058481C3 (de) | Vorrichtung zum Übertragen von Tonerbildern von einem bewegten Aufzeichnungsmaterial auf ein flachgefuhrtes Bildempfangsmaterial | |
DE1249089B (de) | ||
DE2824292C2 (de) | Elektrophotographisches Kopiergerät bei dem eine elektrostatische Abbildung mehrmals entwickelbar und übertragbar ist | |
DE2400716A1 (de) | Verfahren und vorrichtung zum entwickeln einer latente elektrostatische bilder tragenden flaeche mit toner | |
DE1671576A1 (de) | Vervielfaeltigungsverfahren | |
CH616517A5 (de) | ||
EP0890142B1 (de) | Elektrofotografisches druckverfahren zum bedrucken eines trägers | |
DE2832175C3 (de) | Verfahren und Vorrichtung zum Herstellen mehrerer Kopien mit nur einmaliger bildmäßiger Ablichtung einer Vorlage | |
DE2557905C2 (de) | Elektrophotographisches Kopierverfahren | |
DE19541335A1 (de) | Bilderzeugungsgerät zur Herstellung von Bildern gemäß einem elektrophotographischen Prozeß | |
DE2111158C3 (de) | Verfahren und Vorrichtung zur Einstellung eines bestimmten elektrischen Potentials an einem wählbaren ersten Ort der elektrisch leitenden Schicht eines bandförmigen photoleitfähigen Aufzeichnungsmaterials | |
DE2508793A1 (de) | Einrichtung zur ausbildung eines bilds | |
DE2602818A1 (de) | Verfahren und vorrichtung zum elektrographischen drucken auf normalpapier | |
DE2635731C2 (de) | Vorrichtung für ein Elektrofotografisches Verfahren | |
DE2850260A1 (de) | Waermekopierverfahren und -vorrichtung | |
DE2450145A1 (de) | Thermisch unempfindliche steuervorrichtung fuer eine partikelkonzentration | |
DE60036677T2 (de) | Mehrfarben Bildwiedergabemaschine mit Druckmethode für Ladungsumkehr | |
DE3148505A1 (de) | Verfahren zur elektrofotografischen herstellung von farbkopien und vorrichtung zur durchfuehrung des verfahrens | |
EP0932850B1 (de) | Verfahren zum mehrfarbigen elektrofotografischen drucken mit tonern zweier polaritäten | |
DE112008000291B4 (de) | Verfahren zum Erzeugen von nebeneinander auf einem Bedruckstoff liegenden Druckbildern mit Hilfe einer elektrofotografischen Druckeinrichtung | |
DE3036013A1 (de) | Verfahren zur ausbildung von bildern | |
DE2809017B2 (de) | Verfahren zum Herstellen von mehreren Kopien euter Vorlage | |
DE69817079T2 (de) | Verfahren zur Erzeugung von aufeinanderliegenden Tonerbildern auf einem ladungshaltenden Medium und Bilderzeugungsapparat angepasst an dieses Verfahren | |
DE3908410C2 (de) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19981029 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): BE DE FR GB |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
17Q | First examination report despatched |
Effective date: 20010504 |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE FR GB |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
REF | Corresponds to: |
Ref document number: 59705891 Country of ref document: DE Date of ref document: 20020131 |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20020319 |
|
ET | Fr: translation filed | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20070219 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20080331 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20080423 Year of fee payment: 12 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20080328 Year of fee payment: 12 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20081001 |
|
BERE | Be: lapsed |
Owner name: *OCE PRINTING SYSTEMS G.M.B.H. Effective date: 20090331 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20090313 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20091130 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090331 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20090313 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20091123 |