DE2327408A1 - METHOD AND DEVICE FOR IMAGE GENERATION AND APPLICATION OF THE METHOD - Google Patents

Description

T 1 2 4 a

PATENT LAWYERS "O

DR. MÖLLER-BORS · DR. MANiTZ ■ DR. DEUFEL
DIPL-INQ-FINSTERVVALD-DIPL-ING-GRAiVlKOW ■

8 MClNCHEM 22, ROBEriT-XOCH-STR. 1 ^ "* ^{LitX ± 1} ^ '?

^TELEPHONE 225110 23274 08

TUELABOE AG
Geissacherstr. 6, Ch 8126 Zumikon / Schwei ζ

Method and device for image generation and application of the method.

The invention relates to an image generation method. The invention also relates to an apparatus for the execution of the procedure as well as for an application of the procedure.

Various electrophotographic ones are already available for imaging Procedure known. A photoconductive layer is evenly charged electrostatically and then exposed according to an original image. By the selective discharge that takes place here as a function of the original image is produced which corresponds to the original image latent electrostatic charge image. This charge image can be developed immediately by known methods and then optionally transferred to a carrier in the so-called image transfer process. It is also possible to map the charge image to a

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suitable carrier for this according to the so-called charge transfer process to transfer and only then to develop.

However, electrophotographic processes are also proposed which operate without the generation of a latent electrostatic charge image. These procedures are based on the variable conductivity of an image corresponding in or on a photoconductive one Layer generated conductivity image and electrolytic image generation (see US Pat. No. 3,13o, 655). It has also been proposed to use an electrostatic charge image as a function of such a conductivity image on the surface of a photoconductive layer by means of one in close contact with the photoconductive layer to produce standing semiconducting layer (compare UK Pat. No. 797, o27).

Finally, it is known by electrophoretic precipitation colloidal particles to create an image on a semiconductor (compare the article "Methods for producing photographic images on semiconductor surfaces by precipitation of colloidal particles and by electrophoresis " N.I. Bochkareva, L.G. Paritskii and S.M. Ryvkin, A.F. Ioffe Physieotechnical Institute, Academy of Sciences of the USSR,

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Leningrad, Translated from Fizika I Tektnika Poltiprovodnikov Vol. 5, No. 5, p. 9oo-9o3, May 1971).

Known electrophotographic processes for image formation wise, especially .if they are used for generating colored Images serve to have significant disadvantages, for example:

l.-For charging the photoconductive layer, a High voltage corona needed.

2. The high voltage corona causes damage or Deterioration of the photoconductive layer.

3. Unwanted ozone generation. ".

4. Several transfer steps are required.

5. The generation of exact images is difficult or complicated.

6. The exact reproduction of halftones and mixed colors is due to the steep photographic characteristics this process very difficult.

7. If a paper provided with a photoconductive layer is used to bypass transfer steps, so is extremely complex toner material required to avoid difficulties in the electrophotographic process

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according to the first and second partial image, which already made on paper. Electrolytic development of a conductivity image gives an image on the surface of the photoconductor, which Image must then be transferred in an image transfer process. In addition, everyone here needs Step, i.e. each partial image takes a lot of time, "for example about 20 minutes.

8. Charge transfer processes allow almost simultaneous Exposure and development; however, they require image transfers to the final support, what There are considerable difficulties in generating exact images, for example with respect to the exact ones Coverage of the individual color sub-images.

Dar invention is based on the object for colorful images to provide a simple and fast operating procedure for the rapid and accurate imaging, and also a preferably simply not having to handle apparatus for performing the method, which üe said night ^e.

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The present invention relates to a method for image generation according to a template, which is characterized in that taking place depending on the template Exposure of a photolyzing layer on or in this Layer a conductivity image corresponding to the template

this is generated _f which conductivity image "^ is used to control an electric field in a space adjacent to said layer, through which field charged toner particles are moved, the charge of toner particles which said layer or a carrier adjacent to it touch for an image, is changed, and wherein in a further process step when switching off said electric field, toner particles of the original migrate to the carrier for the image in a manner corresponding to that of the original.

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The invention also relates to an apparatus for implementation of the procedure mentioned, which is marked by a first and a second electrode, which are optional can be connected to a voltage source or can be connected to one another, the first electrode being a photoconductive one Layer is associated, which can be exposed by imaging means according to a template and wherein a carrier for an image is arranged on the second electrode and in the space between the two Elektror'- ~ the medium having charged toner particles can be introduced.

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The invention also relates to the use of the method mentioned for the generation of single or multi-colored images.

The invention also relates to the above-mentioned

V-

drive generated images.

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In the following the invention is explained by way of example with reference to the drawing. It shows: 1 shows a schematic representation of the device, not to scale;

La, Ib, Ic three phases of image generation;

Fig. 2 shows a second embodiment in a schematic Depiction;

3 shows details of a first holding device of the exemplary embodiment according to Fig. 2;

FIG. 4 shows a detail from FIG. 3; FIG.

5 details of a second holding device of the exemplary embodiment according to Fig. 2.

Corresponding parts are given the same designations in all figures.

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Fig. 1 shows a schematic representation of a first Exemplary embodiment of a device for carrying out the above-mentioned method. This figure only shows the Basic structure of the arrangement to explain the mode of operation in a representation that is not to scale.

A first electrode 1 is formed by a transparent glass plate 2, which on one side with a thin, transparent conductive layer 3 is covered. This conductive layer 3 can for example consist of tin oxide, as is the case with the well-known Nesa glasses. on the conductive layer 3 is a photoconductive layer 4, for example made of panchromatically sensitized poly (N) vinyl carbazole upset. Raising awareness can for example by adding a small amount of Tetranitrofluorenone (TNF). The thickness of the photoconductive Layer 4 is chosen so that it absorbs light in the visible spectral range in such a way that the Light activates the entire thickness of the layer. The layer thickness is advantageous for a layer made of polyvinyl carbazole prove something like Io to loo u.

Opposite the photoconductive layer 4 of the electrode 1 is equidistant at a small distance »for example a few

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Tenth of a millimeter a second electrode 5, for example an aluminum plate arranged. On the second electrode

5 is in good contact with the same a carrier 6 for an image, for example a sheet of paper. The distance d between the photoconductive layer 4 and the image carrier

6 is preferably no larger than about 300 u, at most about 2 mm.

Many materials are suitable as the carrier 6, which have suitable values of the electrical volume and surface resistance exhibit. For example, normal typewriter paper is well suited, but plastic film can also be used, a glass plate, a metallic foil or a textile material such as a woven or knitted fabric can be used.

In the space 7 between the photo-conductive layer 4 and the picture " Carrier 6 is a dispersion 8 colored as a medium Toner particles 9 in a high-resistance organic liquid » which assumes a certain ZETA potential as a result of the addition of a charge control agent suitable materials will follow later.

An image is created from an original 11, for example a slide, by means of optical imaging means 12 through the transparent electrode 1 on the photoconductive layer 4 ge

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threw. The imaging means 12 is, for example, suitable a slide projector with a light source 12 A, a condenser 12 B, a color slide as a template 11 and a Objective 12 C, which are only shown schematically in FIG. There are, however, other means of imaging known type applicable, which produce an image corresponding to an original 11 on the photoconductive layer.

For reproducing colorful pictures, they are sequentially suitable Color partial images and toner materials used. "More details will follow later.

The electrode 1 of the photoconductive layer 4 is via a Changeover switch 13 either to one pole, in the present exemplary embodiment to the negative pole, of a power source 14 can be connected, or with the second electrode 5 connectable. The second electrode 5 is on the other pole, here on the positive pole of the voltage source 14, and preferably also on earth.

The dispersion 8 preferably contains toner particles 9 in of the order of magnitude from 0.1 to 50 u. The organic liquid Io preferably has a resistivity of about Io ... Io ohm cm. As a color for the toner particles 9 is preferred for creating colorful images

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one of the subtractive primary colors cyan, magenta or yellow is selected. The toner concentration can be approximately in the range . Vary from 0.1 to 10 percent by weight.

The distance between the carrier 6 and the photoconductive s Layer 4 is preferably approximately in the range from 20 to 500 u, at least for part of the exposure time the photoconductive layer 4 is between the two electrodes 1 and 5 an electric field with a field strength of about 1 to 100 volts / u, depending on the sensitivity of the photoconductive layer 4, as well as the charging of the toner particles, effective. Color filter for that on the photoconductive Layer 4 generated images are to be provided for the generation of colored images, namely for the additive primary colors red, green, purple. For example, the following Agfa-Gevaert extract filters are suitable for this:

Red: L 599 green: U 525 violet: U 438

During the exposure time, which depends on the intensity in the order of magnitude of about tenths of a second to a few Seconds, the switch 13 is used to apply the voltage to electrodes 1 and 5, which is about 500 ... 300 volts

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placed to generate said electric field. After the exposure, the electric field is switched off, i.e. the two electrodes are switched off by turning the switch 13 connected directly to each other. As a result, the effect of the electric field causes an extreme rapid migration of the charged toner particles. When in contact with the photoconductive layer 4, or with the Carrier 6 changes in charge of the relevant toner particles occur on. After removing the previously applied voltage, i.e. after connecting the two electrodes to one another, a migration of toner particles takes place to the surface of the carrier 6, on which a partial color image is deposited which corresponds to the conductivity image of the photoconductive layer 4 corresponding to the original 11.

A possible explanation is given on the basis of FIGS. 1 a, 1b and 1c for the conditions and processes occurring in room 7.

In the first phase shown in FIG. 1 a, the two electrodes 3 and 5 are directly connected to one another via the switch 13 ^{which is in its position 13 t.} The colored toner particles 9 are arbitrarily distributed in the liquid Io. In the present example, these toner particles are assumed to be positively charged.

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In the second phase shown in Fig. Ib are the two electrodes 3 and 5 to the two poles of the voltage source via the changeover switch 13, which is now in its position 13 ' 14 connected. As a result of the exposure of the photoconductive layer 4, the respective color conductivity image corresponding to the original image 11. Under the structure dependent on this conductivity picture of the electric field in space 7, the positive toner particles 9 (see FIG. 1 a) migrate in the direction of the electrode 4 and only those among them who are one by the Exposure to the point of the photoconductive layer 4 that has become conductive, emit their positive charge. The on the non-conductive points impinging particles 9 'retain their cargo.

In the third phase shown in FIG they form a color reduction 9 ′ ¹ on the carrier 6 corresponding to the conductivity image of the photoconductive layer 4.

The formation of this color precipitate takes place very quickly,

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ie. in less than a second after switching the switch 13 back to its original position 13 ^! .

La above, the behavior of the toner particles is on the basis of Fig. Ic until been described only with reference to the two particles 9 and 9 'bzwv 9 ^M. Of course, the same behavior applies to the other particles in dispersion 8,

The image carrier 6 is then, for example, together with the electrode 5, preferably withdrawn from the side. The first partial color image obtained is preferably superficial dried, whereupon the process is repeated with a different color filter and associated toner material and in analogously with a third color filter and third toner material the third color sub-image on the image carrier 6 is generated.

Preferably, L for the generation of the three color sub-images depending on the properties of the toner materials

a certain sequence is observed, for example i the sequence customary in conventional color printing technology yellow-magenta-cyan. '

Preferably, the photoconductive layer with a thin protective layer against mechanical and chemical attack

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~ ¹⁶ ~ 23 27 A 08

fe protected to have a longer service life for this Layer to get. For example, Teflon, SiCU or silicon nitride are suitable for this protective layer.

Of course, the photoconductive layer 4 on the first electrode 1 must be cleaned before each color change, However, this is easy to get hold of because of the small amount of dispersion 8.

The finished colored image created with all three color partial images Image can be sprayed with a colorless varnish to fix it and increase its transparency and then dried, for example, by leading past a source of thermal radiation.

To protect the photoelectric layer 4 on the occasion of their Exposure can preferably be provided by an infrared filter , whereby the photoconductive layer 4 is protected from heating. At the same time a Improvement of the red rendering in colored images can be achieved.

The method described has compared to known Image generation processes have a number of advantages which, in this combination, do not exist in any of the known processes occur, namely:

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1. Possibility of using ordinary paper as a paper carrier;

2v No charging of a photoconductive layer required;

3. No development of ozone;

4. No problems in obtaining an exact registration of color part 11 dem, since the relative position of the original and the copy is unchanged during each color process and can be achieved for the different color sub-images by means of simple mechanical stops. The image carrier 6 remains unchanged on the electrode 5 for all color sub-images;

5. Excellent reproduction of halftones and mixed colors.

6. Imaging directly on the final image carrier without any need for transferring.

7. Image excretion on the carrier during the per se very short-term reduction of the electric field within a fraction of a second,

After using the Fig, I the structure and mode of operation of the first exemplary embodiment of an apparatus for carrying out the method mentioned is described and explained a second embodiment will now be made with reference to FIGS deserved.

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According to the second exemplary embodiment, different ones are required in the course of generating a colored image Automated process steps.

The device loo points according to Flß. 2 as imaging means 12 on a slide projector of known design, which is therefore only shown schematically. A color slide serving as a template 11 is pushed into the slide projector in the direction of arrow 15. A shutter 16 is connected downstream of the imaging means * 12. A shutter known from camera technology can be used as shutter 16. The shutter 16 is used to set the exposure time required for generating the conductivity image.

One can in each case in the beam path 17 of the slide projector can be switched on by three color filters 18, 19, 2o. Each of these color filters is used to generate the associated one Color extract or color sub-picture. As a color filter 18 resp. 19 and 2o, for example, the Agfa-Gevaert extract filters red: L599 or purple: U438 or green: U525 are suitable. Preferably, a gray filter 21 which can be inserted into the beam path if required can also be provided in order to prevent documents different average brightness the exposure

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adjust the intensity so that it is independent of the template the same exposure time is always required. About a mirror inclined at 45 ° to the horizontal 22, the beam path 17 is deflected downwards, specifically onto the one arranged horizontally in a first holding device 23 first electrode 1 with its photoconductive layer 4. The first electrode 1 or its conductive layer 3 is connected to the changeover switch 13 via a line 24. With the Changeover switch 13 can be the first electrode 1 either -with one pole 14 A, here the negative pole, of the voltage source 14 or can be connected to the second electrode 5 via a line 25. The second electrode 5 is also with the other pole 14 B, here the positive pole of the voltage source 14, as well as earth verb iden. The second electrode 5 is conductively connected to a second holding device 26. The second holding device 26 is in the horizontal direction by guide means, such as guide rails 27 in Mounted displaceably in the direction of the double arrow 28. The guide rails 27 are by means of bearing blocks 29 on a Base plate 3o of the device supported loo. On the left side of the guide rails 27, a preferably adjustable stop 31 is provided, by means of which the left End position of the second holding device 26.

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BATH ORIGINAL

is adjustable.

On the right side of the guide rails 27 is a loading device 32 provided. By means of the loading device 32 can be produced for each Image a sheet of paper can be fed from a supply roll 33 to the second electrode 5. By means of powered Transport rolls 34 are wound on the supply roll 33 Paper strips peeled off. By an automatically activated depending on the desired paper format Separating device 35 is separated a corresponding piece from said strip and by means of further driven transport rollers 36 on the electrode 5. of the second holding device in its right end position 26 pushed. The second holding device 26 is preferably provided with a vacuum device (not shown in FIG. 2) connected, by means of which the new sheet of paper is fixed on the electrode 5 via suction holes. The device loo preferably also has a Benet * Tongue device 37. The wetting device 37 includes a storage tank 38 for the wetting agent 39, for example Isopar G from Esso.

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The wetting device 37 makes the paper 6 saturated with this wetting agent 39, so that when the toner is poured in through the paper no Solvent is withdrawn because it would change its concentration.

The storage tank 38 is via a line 4o with a Pump 41 connected, which supplies the wetting agent 39 via a further line 42 to a two-way valve 43. An electromagnetically reversible valve of known design is suitable as the two-way valve 43. From the two-way valve 43 leads a line 44 to a nozzle arrangement 45, -on which the second holding device 26 can be guided. The device loo also has a multiple toner requirement device 46 on. Each partial color is its own Conveying part assigned. A first storage tank 47 'contains a supply of toner 48 'for the first partial color. Above a line 49 · the toner flows 48 'from a toner pump " 5o 'and is from this via a line 51' ■ a two-way valve 52 'is supplied as a two-way valve 52' preferably an electromagnetically actuated valve is provided. When the two-way valve 52 is activated, ös conducts the toner 48 'via conduit 53' to an injection nozzle 54 'at the end of the line 53'. If the

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Two-way valve 52 'it directs the toner 48' over a Line 55 'back into the storage tank 47'.

I _n an analogous W _e ise are each a storage tank 47 '', and 47 '", a toner pump 5o'', or 5ο ^111, a two-way valve 52''or52''* and an injection nozzle 54'', or 54 ' ^M and the corresponding lines for the toner 48 ″ or 48 ^IM for the second and third partial color are present, see FIG. 4.

When the second holding device 26 is in its left end position, there is a gap of about 300 y, for example, between the photoconductive layer 4 of the first electrode 1 in the first holding device 23 and the second electrode 5 in the second holding device 26.

The device loo also has a side of the first Holding device 23 arranged cleaning device 56 and a drying device 57, on which both Facilities, the second holding device 26 can be guided past. The cleaning device 56 includes, for example electromagnetically downwardly movable roller 58, which is preferably provided with an elastic covering such as Rubber or the like is provided. The drying device 57 can, for example, with radiant heaters and

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if necessary, be provided with a fan.

3 shows details of the first holding device 23. In a frame 59, the first electrode 1 is held with the photoconductive layer facing down. In the lateral part of the frame 59 .sind the ends of the lines 53 ', 53 "and 53 ^! '' to which the injection nozzles 54 ', or 54 ^rI and 54' ^{M are} connected.

As from FIG. 4, which shows an enlarged section of FIG Scale represents, it can be seen, are the. Injectors 54 ', 54' 'and 54' · 'so against one inclined edge 6o of the first electrode 1 directed that the jet of toner liquid emerging from them in those below the photoconductive layer 4 and above the second electrode 5 lying interspace can flow in.

5 shows a detailed representation of a second holding device 26. 61 represents a wiper which, for example, consists of a rubber profile provided with a sharp edge. The wiper 61 is used to clean the photoconductive layer 4 in each case. Generation of each color sub-image during the movement of the second holding device 26 to the right. The cleaning of the photoconductive layer large x 4 c / 'iept £ üch e'me Re i η FINISH s roller 62nd

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Now that the structure of the device is loo based on FIG. through 5 has been described above, the following is a description of the various process steps in FIG Generation of an image composed of three partial colors.

1. The second holding device 26 is in its right end position spent. The pump 41 and the pumps 5o ', 5ö' ' and 5o '' 'are set in motion and the lamp 12 A of the slide projector is switched on.

2. By briefly switching on the drive element for

34

the transport rollers ^ a piece of the paper strip wound on the supply roll 33 is pulled off.

3 .. After a certain length has been reached, briefly switching on the separating device 35 becomes a suitable one Paper sheet separated from the paper strip.

4. The separated sheet is switched on for a short time of the drive member of the transport rollers 36 is pushed onto the electrode 5 on the holding device 26.

5. The vacuum device of the second holding device 26 is switched on, the sheet of paper on the electrode

5 is sucked in and thereby in its position on the Elek-5 fixed.

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6. The second holding device -26 is moved to the left _f, for example, by a motor acting via a cable, a rack or a threaded spindle.

7. Only while passing the wetting inlet

direction 37, the two-way valve 43 is controlled in such a way that wetting agent 39 from the nozzle arrangement 45 onto the surface of the electrode 5 lying on it Sheet of paper being sprayed.

8. At the first inlet of the second holding device 26 below the first holding device 23 becomes the two-way valve 52 'for supplying the toner 48' for the first color controlled so that during the entry of the second holding device 26 until it reaches the Stop 31 between the photoconductive layer 4 and the second electrode 5 or the one lying thereon Sheet of paper resulting gap is filled with the first toner 48 '.

9. The color filter 18 for the first partial color is in the Beam path 17 spent.

Io. The changeover switch 13 is placed on the * Pol 14 A of the voltage source 14 in order to be in the space between the two electrodes to generate the electric field. ·

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11. The shutter 16 is during the for the first partial color optimal exposure time T, open, whereby in or on the photoconductive layer 4 a conductivity image is created according to the first color part of the template.

12. The switch 13 is switched so that now the first electrode 1 is connected to the second electrode 5. This takes place in a fraction of a second a color deposit corresponding to the first color sub-image on the carrier 6, i.e. on the one on the Electrode 5 sheets of paper resting on it.

13. The second holding device 26 is pulled to the right, laterally away from the first holding device 23, whereby the wiper 61 and cleaning roller 62 remove the toner 48 'from the photoconductive layer.

14. The cleaning device 56 is on the passing Carrier 6 and thus temporarily lowered onto the sheet of paper with the first color precipitation, whereby toner 48 'still adhering to the carrier 6 is squeezed off.

15. The second holding device 26 continues to run to the right to below the drying device 57, which is

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temporarily switched on and thereby the first color sub-picture is dried on the surface.

16. During the drying process, the Cleaning:. direction 58 through the cleaning roller 62 freed from any adhering toner.

17. After the superficial drying is the first The cycle in which the first color sub-image was generated is completed. IC

The second cycle is now generated in the second cycle Color image in a manner analogous to the first color sub-image '.-.

18. The holding device 26 is moving to the left set, with the supply of the toner 48 ″ for the second color sub-image takes place by activating the branch valve 51 ″.

19. The color filter 19 for the second color sub-image is brought into the beam path 17.

20. The changeover switch 13 is connected to pole 14 A of the voltage

source 14 laid.

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21. The shutter 16 is opened during the optimal exposure time T ^ for the second partial color, with in

or on the photoconductive layer 4, a conductivity image corresponding to the second color sub-image arises.

22. The switch 13 is switched so that now the first electrode 1 is connected to the second electrode 5. In a fraction of a second, a color precipitate occurs in accordance with the second Partial color image on the carrier 6, i.e. on the one still resting on the electrode 5, already with the first colored part image provided paper sheet.

23. The second holding device 26 is laterally pulled away from the 'first holding device 23 to the right, wherein the Wiper 61 and the cleaning roller 62 the toner 48 '' remove from the photoconductive layer 4.

24. The cleaning device 56 is on the passing carrier 6 (the sheet of paper with the first and the second color deposit), as a result of which toner 48 ′ still adhering to the carrier 6 is squeezed off.

25. The second holding device 26 continues to the right to under the drying device 57, which is temporarily switched on and thereby the second color

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Part of the picture is dried on the surface.

26. During the drying process, the cleaning device 58 is simultaneously activated by the cleaning roller 62 freed from any adhering toner.

27. After the superficial drying, the second cycle, in which the second color sub-image has been applied to the first color sub-image, completed.

In an analogous way now follows with the third toner 48 '" and the third color filter 2o and the optimal exposure time Τ, for the third color sub-image the third Cycle for generating the third color sub-image the carrier 6 already carrying the first and second color partial images, steps 18 to 2? now appropriate Follow steps 27 to 36 accordingly.

37. Finally, the one who carries all three color parts can Carrier 6 can be coated with an agent increasing the transparency and durability of the color image.

38. This is followed by final drying, after which that too. generating colorful picture is ready.

The steps 1 to 38 mentioned can be carried out manually

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actuation of the various named organs of the device loo or by automatic actuation of the same be realized. There are no difficulties due to the corresponding drives and controls the detailed steps to design. So can the individual switching times for the movement the second holding device 26, for starting the loading device 32j of the wetting device 37, the toner conveying device 46, the cleaning device 56, the drying device 57 and for changing the Color filters can be controlled for example by means of a cam-controlled control device.

For the production of the photoconductive layer 4, come For example, the following materials are in question:

Organic polymers such as polyvinyl carbazole, organic pigments in a suitable substrate such as phthalocyanine, or inorganic pigments in suitable substrates, e.g. cadmium sulfide, zinc oxide, etc. The substrate consists of from a suitable binder, e.g. acrylic resin, styrene resin or similar substances.

In the toner 48 ^l or 48 ″ or 48 ··· the particles can be positively or negatively charged. With reversed polar

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did the Nesglases acting as electrode 1 accordingly the particles create a positive image on the carrier 6, and a negative image with the same polarity, if as a template a positive is used here. Correspondingly, a negative original can be converted into a positive image will. As a carrier 6, for example, an ordinary Typewriter paper, a plastic film, z-.B. Mylar, a textile material, woven or knitted fabric, a sheet of glass, aluminum foil or other metal foil or plate can be used.

To achieve good image transparency, it is preferred a film-forming material is applied to the carrier 6 after the three color partial images have been produced. As such A suitable film-forming material is a varnish, e.g. an acrylic varnish, a resin, e.g. styrene resin, a low-melting point Polymer such as polyethylene or a wax such as paraffin. The application can be done by a conventional technique, e.g. by spraying, brushing on, dipping or rolling on.

It should also be pointed out that a change in polarity of the charge on the particles 9 or the voltage source 1.4 of negative originals positive images, or of Pos itIv templates also negative images can be generated.

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When the polarity of electrode 3 is the same as that The sign of the particle charge is as follows. finds a reversal process instead, i.e. a positive original becomes a negative image, or a positive image is generated from a negative original.

If the polarity of the electrode 3 is opposite to the sign of the particle charge, there is no reversal process instead, i.e. a positive original gives a positive image and a negative original produces a negative image.

This is followed by information about the type, composition and production of substances which are have proven advantageous for imaging by the present process.

1st example :

la) Example of a photoconductor for producing the photoconductive Layer 4:

A 20 u thick layer of a mixture of polyvinyl carbazole and 3 weight percent tetranitrofluorenone as a sensitizer.

Ib) Example for a toner 48 ', (first color: yellow): o, 3 g litholfast yellow 4r / 178o (BASF) and o, o4 g.

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an 8/0 solution of cobalt decanate in solid fuel are supplemented with Isopar G (ESSO) to loo gr. and in a high frequency stirrer for Io min. dispersed. This creates a yellow toner with positively charged ones Particles.

Ic) Example for a 48 "toner (second color: magenta): 10 parts by weight of Fanalrosa 322/2994 (BASF) are put together with 90 parts by weight of Isopar G in a bead mill ground for 30 minutes. 4 g of this concentrate and 0.04 g of an 8/0 solution of cobalt decanate in white spirit four den with Isopar G. 100 gr. supplemented and dispersed in a high frequency stirrer for 10 min. This creates a magenta Toner with positively charged particles.

Id) Example for a toner 48 '' '... (third color: cyan): 5 parts by weight of Savinyl Blue GLS (Sandoz) and 5 parts by weight of Irgazin Blue 3 GT (CIBA-GEIGY) are used together with 90 parts by weight of Isopar G were ground in a pearl ball mill for 30 minutes. 6 gr. Of this concentrate and 0.04 gr. of an 8% cobalt decanate solution in White spirit are supplemented with Isopar G to 100 gr. And dispersed in a high-frequency stirrer for 10 minutes.

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This creates a cyan toner with positively charged particles.

Id) Example for a wetting liquid 39:

The same is preferably used as the wetting liquid Liquid used as for making the toner, E.g. a highly insulating hydrocarbon like Isopar G (ESSO).

Ie) Example for the production of images with substances mentioned under la to Id: After wetting the carrier 6 with the wetting liquid 39, the two electrodes 4 and 5 are brought to coincide and the space 7 is filled with the yellow toner 48 '. The original 11 is projected through a violet filter onto the photoconductor layer 4 for 6 seconds and a voltage of -2.5 kV is applied to the NESA electrode 4 during the same time. After the first partial image has dried on the surface and the photoconductor 4 has been cleaned, the magenta toner 48 ″ is filled in, the original 11 is projected through a green filter for 6 seconds and a voltage of τ3 kV is applied to the NESA electrode 4. After renewed drying and cleaning the cyan toner charged 48 ^'M, the template is projected through a red filter for 6 sec. 11 and simultaneously

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a voltage of -1.5 kV is applied to the NESA electrode 4. The distance d between the paper surface and the photoconductor surface is 16o p. After drying and treating with the fixing agent, a positive full-color image, which corresponds to the original 11, is produced on the carrier. '

2nd example : "

2a) Example for a photoconductor 4:

& -Phthalocyanine is mixed with a styrene acrylic resin as a binder and painted as a 5 µ thick layer. The pigment / binder ratio is 3: Io.

2b) Example for a toner 48 '(color black):

5 ml Hunt toner concentrate (HUNT CHEMICAL CORPORATION) are diluted to 100 ml with Isopar G and stirred well mixed. This creates a black toner with positively charged particles.

2c) Example for the production of the picture:

A black and white positive as template 11 is used during

6 seconds without a color filter on the photoconductor layer 4 projected, at the same time a voltage of -3 kV the NESA electrode 4 is placed. When using the toner 48 'according to 2b), a positive is produced on the carrier 6

black-and-white picture with good halftones, which one the Template 11 corresponds. The distance d is 2oo u.

3rd example:

3a) Example for a photoconductor 4: as under la:

3b) example of a toner 48 ^r "(first color: yellow):. 2 gr of the ink paste". Nagragelb 6. "(SICPA) and o, o4 gr of 8% cobalt Dekanat solution in mineral spirits with Isopar G to loo gr. added and dispersed in a high frequency stir for 10 min. A yellow toner with positively charged particles is produced.

3c) Example for a toner 48 "(second color: magenta): 2 grams of the printing ink paste" Nagrarot 28 "(SICPA) and 0.04 grams of 8% cobalt decanate solution in white spirit are supplemented with Isopar G to 100 grams and in a high-frequency stirrer dispersed for 10 minutes, creating a magenta toner with positively charged particles.

3d) Example for a toner 48 ^{! M} (third color: cyan): 2 gr. Of the printing ink paste "Nagrablau 9" (SICPA) as well as 0.4 gr. 8% cobalt decanate solution in white spirit are supplemented with Isopar G to 100 gr and dispersed in a high frequency stirrer for Io min. The result is a cyan toner with positively charged particles.

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-37- ■ ■.

3e) Example of a wetting liquid _39: "_ as below Id;

3f) Example for image production with the items 3a to 3e named substances:

After the image receptor has been wetted with the wetting liquid 39, the two electrodes 4 and 5 are brought into congruence and the space 7 is filled ^{with the yellow toner 48 f.} The original 11 - a colored slide - is projected through a violet filter onto the photoconductor layer 4 for 6 seconds and a voltage of -2 kV is applied to the NESA electrode during the same time. After the first partial image has dried on the surface and the photoconductor has been cleaned. 4, the magenta toner 48 "is filled in, the original is projected through a green filter for 6 seconds and a voltage of -1.8 kV is simultaneously applied to the NESA electrode. After drying and cleaning again, the cyan toner 48 ^{111 is} filled in, the Original 11 projected through a red filter for 6 seconds and, at the same time, a voltage of -0.9 kV is applied to the NESA electrode 4. The distance d is zoo u positive full color image corresponding to original 11.

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Claims (1)

Claims Λ.j method for generating images from an original, characterized in that, depending on the original, exposure of a photoconductive layer on or on. in this layer a conductivity image corresponding to the template is generated that this conductivity image is used to control an electric field in a space adjacent to said layer, that charged (Eonerpartikel are moved by this electric field, whereby the charge of toner particles, which the said layer, or touch a carrier adjacent to it for an image, is changed, and that in a further process step when switching off said field, toner particles of the original migrate to the carrier for the image accordingly. 2. The method according to claim 1, characterized in that the exposure of the photoconductive Layer takes place with a color separation of the original and a toner matched to the color separation in the named space is spent, whereby a step corresponding to the color separation or the toner in a further process Color sub-image of the template is generated. 3. The method according to claim 1, characterized in that by repeating with different Color separations and different toners matched to them by superimposing several color sub-images colorful image is generated. 9883/1263 4-, method according to claim 1, characterized in that g e k e η η draw t that a complementary colored toner is used to spring color separation. 5. The method according to claim 1, characterized in that g e k e η η draw u, that the polarity is that of the photoconductive Layer associated electrode is opposite to the polarity of that mentioned in the Space "spent toner particles, resulting in a positive image in the case of a positive original and a positive image in the case of a negative original a negative image is produced. 6. The method according to claim 1, characterized in that the polarity of the * photoconductive Layer associated electrode equal to the polarity of the toner particles brought into said tree is, whereby a negative image in the case of a positive original and a positive image in the case of a negative original is produced. . 7- method according to claim 1, characterized in that g e k e η η, that first creates a yellow, then a magenta and then a cyan partial image and these coloring sub-images on the same support are superimposed on each other. 8. The method according to claim 1, characterized in that the carrier for the image is paper is used. ' 9. The method according to claim 1, characterized in that the carrier for the image is plastic is used. · 309883/1263 10. The method according to claim 1, characterized in that glass is used as a carrier for the image is used. 11. The method according to claim 1, characterized in that the carrier for the image is metal is used. 12. The method according to claim 1, characterized in that g e k e η n - ζ ei chne t that textile material is used as a support for the picture. 15. The method according to claim 1, characterized in that g e k e η η ζ ei chnet that the carrier for the image wets before the introduction of the toner in the space mentioned will. -. 14. The method according to claims 1 and 1J, characterized in that the for the recording of the image provided carrier is wetted with a wetting liquid of the same type as the solvent of the toner before it comes into contact with the toner. 15. The method according to claim 1, characterized in that a generated on the carrier Partial or full image, preferably dried and superficially after removing superfluous toner the same carrier is then reused for the generation of a further partial or full image. 16. The method according to claim 1, characterized in that g e k e η η, that the carrier carrying the image, preferably after previous drying with a means increasing the transparency and / or durability of the image, such as a varnish, preferably acrylic, varnish, like a resin, preferably styrene resin, like a 3098 83/1263 2327401 low-melting polymer, preferably polyethylene or like a wax, preferably paraffin in a thin layer is covered. '- - 17 · Device for carrying out the method according to a of claims 1 Ms 16, characterized by a first electrode (3) and a second electrode (5) »which can optionally be connected to a voltage source (14) or can be connected to one another, whereby'der first electrode (3) a photoconductive layer (4) is associated, which by imaging means (12) accordingly a template (11) can be exposed and wherein on the second electrode (5) a carrier (6) for an image is arranged and in the bar (7) between the two electrodes a charged toner particle (9) exhibiting medium (β) can be introduced. 18. The device according to claim 17 »characterized by imaging means (12) with a specific Exposure times adjustable shutter (16) 19. The device according to claim 17, characterized by in the beam path (1?) Of the images medium (12) switchable color filters (18, -19, 20). 20. Device according to claims 17 and 19, characterized by one in each case optionally in the beam path Switchable! color filter like extract filter red L599, violet IM-38, green U525. 21. The device according to claim 17 »marked η et by one in the beam path (17) of the imaging means (12) switchable neutral density filter (21). 309883/1263 22. The device according to claim 17 »characterized by a ^{mirror (22) deflecting the beam path (17) <3-he} imaging means (12) against the photoconductive layer. 23. The device according to claim 17, characterized through a transparent first electrode (3) »which is applied as a conductive layer to a glass plate (2). 24. Device according to claims 17 and 23, characterized by a tin oxide layer as an electrode (3). - 25 · Device according to claim 17 »marked by a photoconductive layer applied to a transparent electrode (3). 26. The device according to claim 17 »characterized through one to the first electrode (3) with the one attached to it photoconductive layer (4) equidistantly arranged second electrode (5) 27 · Device according to claim 17 »marked by a distance (d) of less than 2 mm between the surface of the photoconductive one facing the carrier (6) Layer (4) and the photoconductive layer (4) facing surface of the carrier (6). 28. The device according to claim 17 »characterized due to the arrangement of the first and second electrodes (3 »5) or photoconductive layer, which are movable relative to one another (4) and second electrode (5). 29. Device according to claims 17 and 28, characterized in that the mobility by a preferably adjustable stop (31) is limited. 309883/1263 30. The device according to claim 17, marked ^; by guide means (2?) for the displacement of a holding device (26) receiving the carrier (6) for the image and the second electrode (5). 31. The device according to claim 17 »characterized by a loading device (32) for loading the second electrode (5) with a carrier (6). 32. Apparatus according to claim 17 j g, e ke η η ζ ei c h η e. t by a wetting device (37) for that which can be guided past it "Carrier (6) for an image to be generated. 33 · Apparatus according to claim 17 »obtained by means of a toner hopper of the device (46) for supplying at least one toner (48 ¹ , 48", 48 "') into the tree (7) between the two electrodes ( 3, 5) 34. Apparatus according to claim 17, marked e i c h η e t by a holding device (26) for the second electrode (5), which holding device is movably mounted. 35 · Device according to claim 17 »marked -by one of the cleaning of the photoconductive layer (4) wipers used after parboil precipitation (61) and / or a cleaning roller (62) serving to clean the photoconductive layer (4). 36. Apparatus according to claim 17, characterized by cleaning means (56) for removing excess toner on the carrier. 37. Device according to claims 17, 35 "and 36, thereby gekennz ei c "h η e t, - that cleaning roller (62) and the cleaning device (56) are arranged so that during the passage of the cleaning roller (62) at the The cleaning device (56) touches the movable roller (58) of the cleaning roller (62) as it passes by, and toner adhering to it is stripped off. 309883/1263 2327401 38. Apparatus according to claim 17 »characterized by a drying device (57) for the at least superficial drying of an image on the support (6). 39 · Device according to claim 17 »marked by a control device for the at least partially automatic control of the sequence of the image generation. 40. Apparatus according to claim 17, characterized by a protective layer protecting the photoconductive layer (4-), which consists of more resistant material than the photoconductive layer, preferably Teflon, SiOp or Silicon nitride. 41. Application of the method according to one of claims 1 to 16 for generating single or multi-colored images. 309883/1263