DE1965460A1 - Photoelectrophoretic imaging method and apparatus - Google Patents

Description

1955468

Patent attorneys Dipl.-Ing. RWeickmann,

Dipl.-Ing. H.Weickmann, 'Dipl.-Phys. Dr. K. Fincke D1PL.-ING. R A.WEIGKMANN, Dipl.-Chem. B. Huber

I MONK 16 DEN

PO Box 860 820

MÖHLSTRÄSSE 22, RUPHUMMER 43 3921/22

XEROX COEPOHATION, Rochester, ff.Y. 1460 ^, T.St.A

Method and device sur photoelelstr © pii9r @ t ± seli @ a,

Bilderaeuguag

In the photoelectrophoretical image generation, an image substance suspension is used, which consists of colored aael liskiiempfittdliohen rope uni a non-conductive @ n! BrSg @ 3? FX! IssIgkeit "This Siiapensi ^ a, is brought to Syrian s" o®i2ii © st Qtfei 3l8ktroden, fca äsnea oiao is generally conductive and as in ^ iaierenä © electrode Ι2θ2β1ο ^ ηβΐ3 \ <ü.tÜo SIq other electrode is non-conductive iiai i * s ± tü than Sgersslt-lSbS ^ ä © besseiohnet * The suspension is © ia © s? Botentiaieif £ '© r @ as and with an au reproducing picture' feestrsialto wise, the picture fabric suspension on eiao teia @ pm? Es, te * electrically conductive plate is, foj? Ia des Ü1ins @ a filng ssfgsbracht, and the Be2 , ä.ohtusg takes place ittrok äi © ti? SiiaETiaffeiits te hindurehf wälireaö a swei'äe _f ayläsiäerfS ^ EigG ^ aS electrically tensioned door !! © istroi © il "over the Susp © asi © a Mawegge wire! HafesB with SuspQFäSlss.iss carrier liquid an initial _{charge t} thursä iie they throw aa i © 3 / bound transparent lower electrode «Boi drying is changed by exchanging the water with the lower electesi © ΊΆτβ radiation polarity ₉ so Sag irradiated © 2®il0fe @ s wander on the celestial electrode and this can be used to prepare multicolored ® & m einfar ~ "biger images on both * Slefctroden due to the complementary Teilchenwanäerung Bilios © © = · the method atstehen. In the latter

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Eioh in the suspension photosensitive particles of a single color or several colors that react to one and the same wavelength of light. Its detailed description the photoelectrophoretisohen imaging process finds U.S. Patent Nos. 3,383,993, 3,384,488, 3,384,565 and 3,384,566.

In the case of a multicolor image production, 31 a Bildstoff sue «» pension contains at least two differently colored, finely distributed types of particles in a carrier liquid · Each type of fiber contains an electrically light-sensitive pigment, the main absorption band of which essentially coincides with - & in, tm the sensitivity spectrum »Auf dir .j ν se operates d # r pigment material as the electrically IiQiIrBaPfIrS-Hu ¹ IES medium and as the coloring agent for the respective £ '# € ilah. ¹ ^ In the suspension "Those who are wrong with the Mahrfarbenverfehren" ** - '. "Ropes roll in front of" assigned intense and pure colors. Has - jn nad strongly lent = be sensitive. They should be active with minimal impact "

electromagnetic radiation "already wander, and for jötSe fai ^s ys ma the same amount b-ai irradiation with the height α he respective complementary concerns arise * If the education department is exposed with a multicolor image _f so wander the © f HaJ ah, üiitspreohend the intensity of the absorbier of them ■ -. ■■ * tea Xdohtes on the other electrode should This Seilchenwandaruisg with © iner minimum electrical interaction zwisolisii held the Leuchen different Parben Therefore, it is trwünsolit that the Teiloaen selectively on one of the electron cl #. .!. remain a Ib image-wise distribution, while he does not wander "Wuni * g e particles on the other electrode is ^at": game, a mixture of cyan _s magentafarbenexs and apply Stilohen with a yellow image $ exposed so BCU "::. the oyan-colored and magenta-colored Isiloiien wanderü uai leave behind an image of yellow! The like-colored lights idofct their respective

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tärfarben in the corresponding parts of the picture and wander, eo da8 a fully coloredββ image remains that corresponds to the original image

This method, which uses a conductive injecting electrode, a non-conductive barrier electrode, and photosensitive fibers dispersed in a non-conductive carrier liquid between the electrodes, enables the production of excellent images. Most of them are polymeric

Substances used as a barrier on an electrode

8 1 * 5 have a specific resistance of 10 to 10 - *

Ohm cm or moreThe fabrics in lower range of 10

1 i?
up to 10 ohm cm, for example * baryta paper, allow the production of excellent images, but are sensitive to moisture (their specific resistance changes depending on the relative humidity) .Therefore, these substances are cleaned between the individual image formations lower sensitivity to moisture are therefore preferably usedThese fabrics, whose specific

12th shear resistance is 10 ohm cm or more, for example Mylar and Teflon, however, lead to an increasing deterioration in image quality, especially when generating multiple images with one electrode in rapid succession. For the Thus, a barrier electrode layer can be used with many insulating materials, however, by accumulating charge during image formation, the image quality becomes more specific Resistance worse. This is probably due to an accumulation of undesired charges on the barrier electrode · For example show polymeric fabrics like Mylar and Tedlar when used on a blocking electrode due to its specific resistance

17 1 "? of about 10 and 10 ^ 0hm cm this problem.

The object of the invention is therefore to provide a method for photoelectrophoretic imaging,

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which avoids the flat parts shown above and in particular enables the production of a large number of images in quick succession with consistently high image quality. A large number of barrier electrode materials should be used be*

for a method for photoelectrophoretic imaging, in the case of a fluid suspension to be arranged between two electrodes sur image generation an image irradiation with activating electromagnetic radiation and an electrical one According to the invention, this object is thereby achieved solvedj that the image material suspension continuously and evenly with a loading device to which one electrical voltage can be switched on, is applied to one of the electrodes «

line "device for carrying out this process draws in a further development of the concept of the invention by a first .. electrode, which is a coating device for Applying an image suspension is assigned by a second j on the side facing away from the first electrode the electrode arranged in the bilästoffsuspension, by a device to generate an electrical damage between the electrodes, by means of a device for image-wise distribution Irradiation of the image suspension with activating electromagnetic Radiation and through a device for connecting an electrical voltage to the charging device «,

The invention can be designed in such a way that one electrode, which acts as a blocking electrode, has an ought shape. The other of these electrodes is the injecting electrode. One of the electrodes is at least partially permeable to activating electromagnetic radiation. Near the egg electrode a coating device is rotatably arranged, the running

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fend image pulp suspension to the surface of Hollenbach electrode applying · The Bildatoffsuspension is selectively bit electromagnetic radiation dureh the transparent electrode hinduroh "irradiated" while an electrical? eld st to the image off suspension by applying a Q-leioh "voltage w generated at the charging device ± ic <"the Be-exposure device kaim the form of a St & bes tob®n _s in face contact sit ier Sperrelekiroäe & eoMeht $ ®r barrier electrode .steht · This Besehiohtungests-h teissgi the role electrode sine glelehaafiig · skewness" of Biliotoffsuspen "- s ion, while he gleio & other a · charge on & m <surface of the barrier electrode distributed · lie imaging is then dureh at the GberfläeMe the isajisiarenäea Hektrode. S @ilohen <wander! "ag completed ₉ m UaB komplcasstSs ^5" Farfefeilder on the surfaces of llektr © ä © a © atste hot »Si® S @ ll®2! i« or picture

wirä üsmsi with the "besöteiefeenem leachish-" © ut be £ 30hieht © t, so "let ii @ Bllistoffeiis · * pension again sufg®fri3 @ ht tiii? i _e wäarexitl gleiöh.g © ITLG the accumulation unerwünsöäte ^ üadungen on ügt The surface of the insulating barrier electrode is nsufealisiert wiri ₉ Bic the effect of the charge with the Besohiohtimgsstal consists of sleo flarla ^ daS ± ® barrier electrode; for Brzeugimg äss electrical » " Eelüm swise & en ^ e? Blocking electrode and you lay out electrsä © i ^ äteeni of the image generation by Berüiir-ffiag amfgsladea wis? D and next Bildaeugungsz ^ klu® «left aneamiBlimg on the surface of the blocking electrode wlTi * BeS another embodiment of the invention can accumulate on the blocking © electrode in

Steps are avoided, and it was in a picture generating device in which the picture suction field immediately swi »ohen the electrodes wls» ö and hereby © opaanung directly on the blocking area. Voltage is switched off from the core of the blocking electrode while neutralizing the location the Obej? flil @ & G 3®r blocking electrode a voltage sa den Basohiofetuisgßste, ^

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This tension is then removed from the coating rod again and the imaging field between the blocking electrode and the injecting electrode is turned on again

When carrying out the method according to the invention, it was found that by directly connecting a direct voltage to the holding rod, the accumulation of discharges on the blocking electrode can be prevented, which has an effect on the quality of the subsequent images, except for neutralization With these external charges on the surface of the barrier electrode, it is possible to obtain the required level for image generation. ^r: eld to be generated on the BiIiatoffsuspension »Besides' ... r; The charge of the beaconing rod also resulted in the formation of sinks on the image suspension during dt * :; J ^ 'jriisgii.a, »avoided on the electrode surface

Invention is in the fclgenü «&. a & asiii practices showing figures besohri® «« »ben« Bs
Pig.1 the section of an embodiment of a device for carrying out the method according to the invention and

fig-fg eiiie front view of the device shown in I? ig # 1 »

A transparent electrode 1 is shown in FIG. 3? Igo1 of an optically transparent glass 2 and a thin and transparent layer 3 made of tin oxide thereon stands »Such a glass plate is commercially available under the name NESA glass» This electrode is used in the fc> ■ referred to as the injecting electrode «Nah? the

Electrode 1 is a rotatable 21ekv? Od * 5 conductive core 11 with a layer "ia" s the barrier electrode material 12 is covered.

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designated. · Sin eingehend® Bsaohreibung such electrodes and for verwendbsran substances found in the U »S.Patent aohrift% 383 993. A thin layer 4 of the image material ■ ~ uspension, the distributed from fine particles dispersed in a photosensitive niohtleitenden consists Srägerflüssigkeit , is applied to the surface of the barrier electrode as a suction, for which "in® BeeoMofttungavOrri along 13 serves" the deposition of the material to be applied is so hem ± Bt ₉ that a uniform. SsMohtstarke results in β Bie Besohichtungvorriohtuag consists of the rods 14 w && 15 as well as the Aiwiruokrolle 16 and 17 Speyrelsktroae 5 forms a pictorial torrat 19 »

one in the Biidetoffauapeiision ^ orhaaäeaea i ± ndliohen ^H particle should be in äei? following Besßtesifeeiag j & ä & ■ leilohen understood werdea _f äaa-won after initial 3ind "r <g 'm of injecting Slektrod® this under d © m influence of a tlsktrisohen field migrating upon exposure siner activating electromagnetic radiation · The image pulp suspension may also be a SensitiTieraiagsmittsl and / or a binder for the pigment particles. eatfealt @ a _f where the binding agent should be at least partially soluble in the carrier liquid.

While the barrier "eggs Biläerzeügungselektroäe 5 is on the surface of the injecting electrode 1 hinweggefüJirfc, the switch 1 gesehl © SSEA _s thereby an electric PEiD is generated with ä © r voltage source 8 to the image stock suspension 4 · The core of the barrier electrode is connected to Erie * The pigment suspension is exposed with a bucket projection device which consists of a Liohtquelle 2t, a transparent image 22 and an optic 23. A color slide is used as a see-through image.While the image forming roller is passed over the surface of the MESA electrode,

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is image suspension from the supply 19 evenly applied to the surface of the imaging electrode. Simultaneously the electrical field for image generation is generated by connecting the DC voltage to the coating rod 14 on the surface of the injecting electrode and to neutralize the residual charges on the surface of the barrier electrode generated. As a result of the exposure, those initially bound to the injecting electrode 1 and then irradiated migrate Particles through the carrier liquid so that they can adhere to the surface of the image forming electrode 5 and leaving an image corresponding to the original image 22 on the surface of the injecting electrode.

In Figo2 is a front view of the device for implementation of the method according to the invention shown · The treatment device 13 consisting of holder 18, coating rod 14 and pressure roller 17 brings the image material suspension 4 on the surface of the barrier electrode 5. The injecting electrode 1 consists of the conductive base 2 and the Tin oxide layer 3 and is arranged under the barrier electrode 5. Between the coating rod 14 and the injecting one HESA electrode 1 has an electrical connection via the already described voltage source 8 and the switch 7

The injecting electrode should preferably be made of an optically transparent material such as glass coated with a conductive material such as tin oxide, copper, copper iodide,

e-

Gold or similar is coated for optimal results. Other suitable substances including many semiconductors such as raw cellophane which are not normally viewed as conductors but an uptake of injected charge carriers of the appropriate polarity under the influence of an electric field enable can also be used. The more conductive materials, however, allow better charge separation and prevent possible accumulation of charges on the elec-

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19.65480

trode, which is the electrical generated between the electrodes Could weaken the field. The barrier electrode, on the other hand, is selected to facilitate the injection of electrons into the light-sensitive pigment parts are prevented or largely prevented turns off when the! particles reach their surface. The core of the locking electrode "generally consists of a material with high electrical conductivity. Typical conductive materials are conductive rubber, made of metal foils Steel, aluminum, copper or brass. However, if a material of low conductivity is used, it must have a special electrical value Connection to the back of the barrier electrode layer must be made «A special barrier electrode layer must be made although not necessarily provided, it greatly improves the results of the imaging process. In general if the barrier electrode layer is made of a substance with a special

a specific resistance of approx. 10 ohm cm or more,

12 17 values are preferably in the range from approx. 10 to 10 Ohm om. Favorable barrier electrode materials are, for example, baryta paper, one with suspended in a gelatin solution Barium sulfate coated paper, Tedlar, a polyvinyl fluoride, and polyurethane. However, other materials with the desired specific resistance can also be used. Typical Materials are paper coated with cellulose acetate, polystyrene, polytetrafluoroethylene and polyethylene terephthalate. The barrier electrode layer can be designed as a special replaceable layer that is attached to the barrier electrode with mechanical Fastening elements or in a similar manner is easy to attach and is held in a simple manner. The layer but can also be designed as part of the electrode itself and glued to the electrode surface or be sprayed on «.

The image forming steps described above are repeated carried out and the blocking electrode cleaned

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- ίο -

If, however, it is not discharged before the respective image generation step, there is a steady decline in the image quality with an increasing number of images generated. This deterioration is caused by the accumulation of undesirable electrostatic charges on the surface of the barrier electrode. For this reason, according to the invention, a voltage is connected to the coating device which is in contact with the barrier electrode layer or the substance present on the surface of the roller electrode. In general, the value of the connected voltage will depend on the particular device and the results desired. Voltages of 2000 volts and up to 7000 volts have been connected to the loader, but other voltage values can be used if they do not have a deleterious effect _e Preferably operating voltages range from oa _e 4500 to about 5500 volts "the used coating device should include at least more than one hell for distributing the image stock suspension on the barrier electrode. The number of rollers used depends, however, on the purpose for which the respective image-forming device is used and the thickness with which the suspension is to be applied to the barrier electrode. The layer thickness is generally between approx. 0.025 mm and approx. 0.15 mm , preferably at 0.1 mm. The respective coating rod is used in such a way that it transfers a voltage to the barrier electrode surface when touched, which neutralizes the charge accumulation on the barrier electrode layer and generates the electrical field required for image generation on the image material suspension in the contact area of the two electrodes. Typical coating sticks that can be used are sticks made of conductive glass, conductive rubber and wire-wound sticks known as Meyer spreading sticks.

Different electrode gaps can be set, the distance to the electrode contact is preferably less than 0.25 mm, since these values result

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.a better image resolution and with a multicolor process better color separation. This improvement is due to the high field strength at the image suspension at this low level Recirculated at intervals «

In the multicolor process, the image particles are such selected that they correspond to their different coloring at different wavelengths of the visible spectrum respond according to their main absorption bands and that their sensitivity spectra do not substantially overlap one another, so that color separation and subtractive Color image generation is possible. Different types of parts that can be used are, for example, cyan-colored particles, which are mainly sensitive to red light, magenta colored particles which are mainly sensitive to green light and yellow particles that are mainly sensitive to blue light are. This is the simplest combination of particles. There can also be additional particles with different ones Absorption maxima can be provided in order to improve the color synthesis. When mixed in the carrier liquid, these particles produce a black color, and if one or more Particle types are caused to migrate in the suspension, the remaining particles produce a color which corresponds to that of the respective incident light. For example exposure to red light causes the cyan pigment particles to migrate to form the magenta and yellow particles remain and combine to form a red color · In the same way becomes a blue or green color produced when yellow or magenta colored Particles are removed. If white light strikes the mixture of images, all pigment particles and migrate leave the color of the white or transparent base. No exposure causes all pigment to remain particles and thus a black color · This is an ideal method for subtractive imaging because

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the particles do not consist of just one component each, but they fulfill the double puncture as a coloring agent and as a photosensitive medium. Therefore, this method represents a significant simplification of known methods subtractive color imaging · In a single color process particles of a single color or particles of several colors are used, but they are at the same wavelength react when dispersed in the carrier liquid and exposed to a black and white image · It gives then a monochrome picture according to the black and white photograph.

The roller shape of the barrier electrode shown in the figures is only an example. Other configurations can also be used. For example, the barrier electrode be in the form of a moving or stationary flat plate or a continuous belt «It's auoh possible to provide a transparent barrier electrode so that exposure can take place through it.

Any suitable carrier liquid can be used to carry out the method according to the invention. Suitable substances are decane, dodecane, and tetradecane, melted paraffin wax, melted beeswax, and other melted thermoplastic Fabrics. Sohio Odorless Solvent, a kerosene fraction available from Standard Oil Co. of Ohio and Isopar G, a long chain saturated aliphatic hydrocarbon available from Humble Oil Co. of New Jersey also suitable · Mixtures of these substances also meet the requirements of the process according to the invention · ■

Any suitable composition of differently colored photosensitive pigment particles with sensitivity8 spectra, as described in U.S. Patents 3,384,488 and

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3 384 566 can be used for the image material suspension · The percentage of pigment in the non-conductive carrier liquid is not critical. With a proportion of oa «, 2 to approx. 10 wt .- # pigment good results have been achieved. The particle image obtained after the image formation can for example be on the respective electrode by spraying a binder onto the image area, by laying a film or by including one Binder are fixed in the image suspension. In general, however, it is preferred to use the image from the respective To transfer the electrode to another image carrier and to fix it on it so that the electrode repeats can be used for image generation. The image transfer can be partially removed with adhesive tape or preferably done electrostatically. Photoelectrophoretic image transfer is also possible.

The following examples serve to explain the process according to the invention further, but not to restrict it. Parts and percentages relate to weight, unless otherwise stated. In this case, four different image stock suspensions are used in a device of the type shown in Pigol The injecting electrode consists of EESA-fflas, the conductive coating is connected to ground · The barrier electrode consists of a conductive hard rubber core of oa _e 5 cm Durohmesser, the coated with a Tedlarschicht · is a negative voltage of _e above is applied to the Besohiohtungsstab turned 3000 volts during the image exposure. The exposure takes place with a photographic Durohsiohtbild with a light intensity of approx. 19,370 lux. The image suspension consists of approx. 7 parts by weight of pigment particles, which are dispersed in approx. 100 parts by weight of mineral oil.

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suspension is 0.08 now applied to the surface of the barrier electrode having a thickness of _e above in Examples 1 and 2 and of ca _o 0.1 mm in Examples 3 and 4 ·

Example I.

A three-component mixture is produced by dispersing equal proportions of the cyan-colored pigment Monolite Past Blue GS, the alpha-form metal-free phthalocyanines, CI ITr. 74100, available from Arnold Hoffman Co., of the magenta pigment Watchung Red B, a barium salt of 1- (4'-methyl-5 ^l -chloro-2'-sulfonic acid) azobenzene-2-hydroxy-3-napathenic acid, CI Fr 15865, available from EI duPont de Nemours & Co., and the yellow pigment Algol Yellow GG, 1,2,5,6-di (G, G'-diphenyl) thiazole anthraquinone, CI. No. 67300 available from General Dyestuffs. Mineral oil is used as the carrier fluid. The three-substance mixture is applied as a coating and the images produced with it are fully colored and correspond to the original transparencies

Example II

A three-component mixture is prepared by dispersing equal proportions of the cyan-colored pigment Diane Blue, 3,3'-methoxy-4,4'-diphenyl-bis (1 "-azo-2 ^ll -hydroxy-3 ^ll -naphthanilide), CI. No. 21180, available from Harmon Colors, the magenta pigment Calcium Lithol Red, a calcium dye of 1- (2'-azonaphthalene-1'sulfonic acid) -2-naphthol, CI No. 15630, available from Gollway Colors, and the yellow pigment N-2 "-PyridyV8,13-dioxodinaphtho- (2,1-6; 2 ¹ , 3 ^f d-furan-6-carboxamide), described in British patents 1,137,885 and 1,137,886. Mineral oil is used as the carrier liquid. The three-substance mixture is used to generate images in the manner described above and results in fully colored images that correspond to the original transparency »

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Example III

Seven parts by weight of the metal-free phthalocyanines described in Example 1 are mixed with one hundred parts of mineral oil mixed. The obtained one-substance mixture is on a NESA electrode applied as a layer and described in the above Manner of image generation · The result is a cyan image on a white background.

Example IY

An image suspension is prepared from equal proportions of Bonadur Red B, iC + 'chloro-S ^ ethyl ^ ¹ -sulfonic acid) -azobenzene-2-hydroxy-3-naphthenic acid, available from American Cyanamid, from Monolite Past Blue GS and from in .Example 2 named yellow pigment. Sohio Solvent 3440 is used as the liquid. The result is a fully colored image that corresponds to the colored original see-through image

Although certain substances and amounts of substance have been mentioned in the preceding examples, each of the others can also go further substances mentioned above can be used with similar results. Furthermore, additional Steps or modifications may be provided if so desired · In the image suspension and the other for Implementation of the method according to the invention elements used, additives can also be used, which a show improving, synergetic or otherwise beneficial effect on the respective properties. For example, can various sensitizers can be provided in the image suspension.

Further embodiments of the invention are possible for the person skilled in the art, which, however, are encompassed as a whole by the basic concept of the present invention "

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Claims (17)

1965469 - 16 claims A method of photoelectrophoretic imaging in which one is placed between two electrodes Image suspension for image generation an image irradiation acts with activating electromagnetic radiation and an electric field, characterized in that the image suspension (4) continuously and smoothly with a coating device (14, 15) to which one electrical voltage (8) is switched on, is applied to one of the electrodes (5, 1). 2. The method according to claim 1, characterized in that the connected to the coating device (14, 15) electrical voltage (8) is also used to generate the electrical field required for image irradiation will· 3. Method according to claim 1 or 2, characterized in that that an image suspension (4) from particles finely distributed in a carrier liquid image, each an electrically photosensitive pigment is used and that the image irradiation by a of the electrodes (1, 5), which is transparent, is taken 4. The method according to claim 3 »characterized in that the electrodes (1, 5) in virtual Be ordered to touch « 5. The method according to claim 3 or 4, characterized in that a pigment is used which is used as a light-sensitive Medium and acts as a coloring agent for the particles 009829 / U40 6. The method according to Anspruoh 5 »characterized in that at least two differently colored types of particles are used, each one electrically photosensitive Contain pigment, its main absorption band for activating electromagnetic radiation essentially coincides with its sensitivity spectrum. 7ο Method according to one of the preceding claims, characterized in that the required for image generation electrical sorry between the two electrodes (1, 5) is generated and that in addition an electrical. Voltage is switched on to the coating device (14, 15) « 8 _e method according to claim 7, characterized in that, with repeated image generation, the electrical power supply required for image generation between the electrodes (1 »5) is switched on again in each case Device for carrying out "the method according to one of claims 1 to 8, characterized in that a first electrode (5) is assigned to a charging device (14, 15) for applying an image suspension (4), by a second electrode on which the first electrode Electrode (5) applied side of the image suspension (4) arranged® electrode (1), through a device (8) for generating an electrical damage between the electrodes (1 _r 5) »through a device (21, 22, 23) for image-wise distributed irradiation of the image suspension (4) with activating electromagnetic radiation and a® device (8) for connecting an electrical voltage to the coating device (14 »15) · 10 »Device, according to claim 9 _9, characterized in that aur generating electrical damage between the elec- 009829/1440 electrodes (1, 5) and for connecting an electrical voltage a common device (8) is provided on the shoeing device (14, 15). 11. The device according to claim 10, characterized in that the first electrode (5) has a rotatable, roller-shaped The electrode is that the second electrode (1) touches the image substance suspension (4) on the first electrode (5) or with a distance of up to 0.025 mm to the image suspension (4) is arranged that at least one (1) of the electrodes (1, 5) is permeable to activating electromagnetic radiation and that at least one (5) of the electrodes (1, 5) with one of the image suspension (4) facing blocking electrode surface is provided «, Device according to Claim 11, characterized in that the coating device (14 _; 15) is arranged in contact with the electrode (5) which carries the blocking element 13 · Vorrioht'ong according to claim 12 _S ä & 6 ~ i £ oh gakenassichnet that the Beschiohtungsirorrichtung (14 _S 15) consists of at least one wire-wound metal rod® * 14 · Device according to claim 12, characterized in that the coating device (14 »15) consists of at least one conductive glass rod. 15. The device according to claim 12, characterized in that the Beschiohtungsvorrichtung (14, 15) consists of at least one conductive rubber roller 16. Device according to one of claims * f to 15 »thereby characterized in that the second electrode (1) as a rotatable 009829 / U40 Roller electrode is designed so that the longitudinal axes of both electrodes (1, 5) are arranged parallel to one another and that both electrodes (1, 5) are rotated synchronously during image generation 17. Device according to one of the preceding claims, characterized characterized in that further an image transfer device for transferring the generated image from one of the electrodes (1, 5) is provided on a receiving sheet is· 009829 / 1AA0 to Blank page