DE1280281B - Method and arrangement for converting an electrical signal into a graphic image - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

H04n

German class: 21 al-32/04

Number: 1280 281

File number: P 12 80 281.2-31 (R 40767)

Filing date: June 1, 1965

Opening day: October 17, 1968

The invention relates to the conversion of an electrical signal into a graphic image and in particular to a signal image recorder with electro-optical scanning.

Although there is now a great need for writing implements for recording electrical signals of high speed and large amount of information, e.g. B. with video recorders for television or other systems, this need is still largely unsatisfied. This is especially true for the relatively fast recording in good image receivers. For example, when recording images, the receiver must be equipped with one of the direct-working writers that are generally used in technology today, or with an image writer such as is most preferably used today in press video broadcasting. The direct working writing systems mostly use an electrolytic or an electrosensitive recording paper. On this specially manufactured registration paper, the image is generated by the action of electrical discharges on very small pieces of surface, with the paper being colored according to the size of the potential. Since this specially made paper cannot generally be used for recording a second image, the material costs of this writing system are relatively high. In addition, the special nature of the electrical discharges leads to the formation of a rather coarse-grained image consisting of a large number of small dots. While poor quality of the final image can be allowed, these systems are often not used because of their extremely slow writing speeds. If better quality or faster writing is required, recording materials with halogen silver are generally used. However, there are certain disadvantages with halogen silver video pens, which by far outweigh the advantages. These include the high cost of halogen writing materials and the fact that they cannot be reused to amortize their relatively high cost on a large number of images. Furthermore, they must be developed with undesired liquid developer and monitored in the process. In addition, the access time for such an image is relatively high, since the images are only visible after development. Instead of the input signals, most video recorders use a gas discharge lamp or light point scanning by means of a cathode ray tube in order to cause an electrical discharge on the recording paper. In the gas discharge process and arrangement for conversion
of an electrical signal into a graphic image

Applicant:

Rank Xerox Limited, London

Representative:

Dipl.-Ing. F. Weickmann,

Dipl.-Ing. H. Weickmann

and Dipl.-Phys. Dr. K. Fincke, patent attorneys,

8000 Munich 27, Möhlstr. 22nd

Named as inventor:
Robert William Grundlach,
Victor, NY (V. St. A.)

Claimed priority:

V. St. v. America June 1, 1964 (371481)

dung control tube and the cathode ray tube, the output light signal is sent to a point of the image paper concentrated and controlled in such a way that he wanders through the paper like a grid while the Luminous intensity changes depending on the amplitude of the input signal.

It is possible to eliminate many of the drawbacks of today's picture writers by using them the xerographic recording technique instead of the silver halide recording. In xerography, first described in U.S. Patent 2,297,691 and later improved by many patents a photoconductive, but otherwise non-conductive, so-called xerographic plate is evenly charged.

It is made sensitive to light and then a photo or another pattern image, the electromagnetic Radiation generated, exposed, whereby a charge balance is brought about in the irradiated surface parts. That way it gets a charge or latent electrostatic image is coincident on the photoconductive plate with the sample picture. Of course, the xerographic plate can be used in an image writer device do not expose immediately to the whole light image, but one will scan it with a light source, whose Intensity is changed depending on the amplitude of the input signal. After that, that will Image developed by the deposition of a

809 627/1080

Electroscopic, or electrostatically attractable, device becomes one via a transmission line finely divided colored substance on the photoconductive image signal received from an image transmitter Layer. This substance, in the art also image powder, feeds the input lines 10 to a demodulator 11 (called toner), is given by the latent electro- where it is separated from its carrier frequency static image on the surface of the xerographic 5 is seen before it is sent to an input amplifier 12 Plate deposited as a dust pattern. This dust reaches. The output of this amplifier is with a Bild can then possibly be connected to the photoconductive small sliding contact 13, which is attached to a Insulating layer viewed in place or attached to a fixed support 14. The grinder Sheet of paper or similar material for 13 is arranged so that it goes with each of the later Use. In the case of the ver io, consecutive contacts 15 at the insulated end application of amorphous selenium for the photoconductive Iso- a cylindrical drum 17 has contact if layer of a xerographic plate (USA patent, this rotates around its longitudinal axis. As after-2 970 906) the dust pattern can be described in more detail on a picture sheet, is any be carried, and the xerographic plate can contact 15 electrically connected to a conductor, cleaned immediately and for many thousands of operations, a large number of which are to each other and to can be used again. In view of the fact- longitudinal axis of the drum 17 parallel close to it matter that the cost of the selenium plate is embedded by the outer surface. When rotating the many thousands of possible copies are amortized, drum 17 is therefore one by the device is the cost of the photosensitive material, received input signal of a very affordable with halogen silver, very low per picture. 20 len elongated segment near the outer surface of the In addition, photosharp drums are switched to the next one in this way. This is Reproductions of the transmitted by the broadcasting station, perhaps best to the one shown in FIG. 4 Leigen shown Original images achieved. Although the above tern 52 to 54 can be seen. In other words, is Photo-image writer described compared to the device constructed so that the electrical normal halogen silver video recorder some pre-25 input signal is decomposed on the drum surface, has parts, such as low cost, easy development by applying the signal to each other at high speed Access time etc., it is parallel to the longitudinal axis of the drum in the following production speed of the images a little slower than the line segments.

fastest silver halide writer. The output of a very stable local

It is therefore the object of the invention, a new oscillator 18 is given to an amplifier 19, Method for xerographic recording, which in turn controls a synchronous motor 21, wel image signals to accomplish. rather drives the moving parts of the system. on

Furthermore, the invention is intended to be a novel device. The shaft of the synchronous motor 21 is a drive unit for recording image signals with a large pinion 22 attached to another gear Speed and low cost to the counter 35 23 is related. This gear 23 is on have stood. the shaft 24 of the drum 17 attached so that it is the

Furthermore, the invention consists in creating the drum directly in the drum shown in FIG of a novel method and arrangement rotates in the direction of the arrow. In addition, there is a great tooth dinner Implementation in which the xerographic wheel 26 is also attached to the shaft 24. It stands Recording of radio images mixed electrically 40 in driving connection with a small pinion optical technology is used. 27. This is attached to a spindle 28, in

The invention also provides a method in which a reversing thread is cut and for xerographic image recording with strong he carries a slide 29 that moves when it rotates Speed described. hung the spindle 28 in front of the drum 17 and

The essence of the invention and other features 45 moved forward. The carriage 29 carries a light and benefits go from the following incoming source 31 as well as a lens 32 that illuminates the light of the Description of specific embodiments at source 31 in a very small point on the upper hand of the drawings. area of the drum 17 bundles. The light source 31 F i g. Figure 1 shows a partially pictorial fidelity can any strong source with constant off representation an image receiver according to the invention 50 be output power, such as an arc lamp od. Ä. dung, leaving some parts of the overall facility away- The possibility of using a constant star are; ken light source in this facility in contrast to FIG. 2 shows the view of the right end of the in to the modulated light sources of other systems Fig. 1 as well as in addition that in offers great advantages, especially in xerographic An-F i g. 1 omitted parts; 55 were in which generally substances with relatively lower F i g. 3 shows a partial section from the end of the wer-F used in photographic speed i g. 1 and 2 drum shown; the. The use of a constant strong light-F i g. 4 shows the section 4-4 from FIG. 3; source allows a large increase in the Ab-Fig. 5 shows a partial section at the end of a scanning speed. The internal thread of the slide another embodiment of the drum from FIG. 3; 60 29 and the thread of the spindle 28 are so bemes-F i g. Fig. 6 shows an equal-length representation of a sensor that is produced by the light source 31 and the lens Another embodiment of a fast working 32 spot of light is generated only on the part of the Scanning mechanism. Moved drum surface, which is covered with a photoconductive Although this invention is broadly an insulating layer 33. The carriage 29 has Device for converting electrical signals in 65 also has a triangular hole that is used for guidance graphic images as well as for image recording the carriage 29 meets on a triangular guide, is in Fig. 1 an image radio receiver serves as a rail 34, which in turn is based on a warehouse management example of the invention shown. In this bank 35 is attached. All shafts, the engine as well

5 6

the bearing bank 35 are contained on suitable rigid position coupling, which is held by one over the stanchions attached, but the phase pulse amplifiers controlled by the system gangway for a better overview are not shown. As described above, is actuated.

the electrical input signal after demodulation Is the latent electrostatic image on the drum and reinforcement on the line segments of the drum 17 through the combined effect of the light mel 17 given. As described in more detail below for reference 31 and the electrical input signals, is at the point where one of the image signal det, so it is developed or made visible and controlled conductor the light beam of the source 31 on a sheet of recording paper or other image and crosses lens 32, transferring an electrostatic latent material. Transit facilities Image generated. The result of these processes is therefore io tion of these development and transfer steps a scanning of the drum 17 by the light are shown in FIG. 1 for easier explanation of others source. In addition, the strength of the latent electro- characteristics is not shown. In Fig. However, 2 are the static image depends on the size of the additional development and transmission input signal, You can perhaps see some details of the facility on the directions. the end best by comparison with a cathode ray 15 Fig. 2 it can be seen that when the latent electro-tube to understand. The light source correspond to the static picture due to the combination effect 31, the lens 32 and its guide and movement light source 31 and the drum 17 through mechanism the horizontal deflection plates of a signal given to the sliding contact 13 once on the cathode ray tube, while that is built in the drum, it is guided past the cathode ray generator along a grounded sliding contact 16 Hegenden conductor, the task of which will be discussed below. This comparison is possible because the copy is being made. Then the drum turns The position of the latent electrostatic image - a discovery designated in its entirety with 37 - is tactile passing on the drum and the signal on the conductor winding unit. This works according to one in the drum determines the image strength. The verti- cascade principle and consists of an outer Bekale The drum is scanned by its container or housing 38 with a trough in its Rotation achieved. Ground, which contains a supply of developer material. Of course you have to, although the whole holds. The developer comes from the bottom of the housing image transmitter not shown and described here ses 38 is included and is conveyed by a number of the transmitter and the image writer completely cup 41 on an endless conveyor belt 42 over work synchronously so that a good 30 distributes the drum surface with the original. This evolutionary technique coincides Picture in the recorder reprodu- ce, which is more detailed in the USA. Patents 2,618,552 is adorned. For example, in one embodiment, and 2 618 551 is described, one is used from example the original developer mix consisting of two elements on a transmission drum, the the same type as the writing drum 17 arranged from finely divided, colored character particles or and by a local oscillator, amplifier, 35 image powder (toner) and coarser carrier grains be synchronous motor and gearbox is in accordance with. The carrier grains are used to loosen the driven by the writing drum. A light source image powder as well as its charge by impact located on the original drum and a kung of the relative locations of the image powder material Carriage, the light source and a lens or and the carrier material to each other in the friction Lens system carries. A photocell receives the 40 electrical series. If the carrier grains with the image powder particles adhering to it reflected from a point on the original via the drum light. The carriage will be distributed by a spindle with circumferential surface, pull the electrostatic Control thread, similar to the lead screw 28 in the field of the charge image on the drum image writing instrument, driven in the same way. The Si powder particles from the carrier grains per se to Signal is then used by the photocell to develop the image into a Mo- 45. The carrier grains fall zudulator directed where it is with a carrier frequency of a together with not brought to the image development Carrier frequency generator is mixed. Then particles are returned to the bottom of the housing 38, β »amplified and transmitted via wire or wireless. and the developed image continues to rotate until it is in If costs are to be reduced to a minimum, contact with an illustrated book 42 gets through so you can use local oscillators 50 with the same frequency two drag rollers 43 up against the drum Transmitter and receiver do without, and the system surface is pressed so that it is the same can be moved by frequency control of the local speed as the drum circumference. Power supply can be synchronized. Others are A transmission unit 44 is at a short distance Known types of synchronization can also be used behind the belt and between the rollers 43 be e.g. B. the synchronization over the 55 assigns. It contains one or more wire threads, Carrier frequency. In addition, it should be noted that the other with a voltage source 45 high potential drives are continuously connected in the picture recorder shown and work after the corona discharge, d. That is, the local oscillator 18, the amplifier technique described in U.S. Patents 2,588,699 19, and the synchronous motor 21 work underneath and 2 777 957 has been described. This in the USA.-broke, except when they are switched on and off by hand. 60 Patent 2,576,047 be switched. In a detail one is mainly that the threads are only practical The system would have to have a phase control at a distance from the surface to be charged, shown at the left end of the recorder with a grounded conductive pad behind it to define the beginning of a received Ab- area is arranged and that a high potential touch line is used. In such a system is applied in 65 to the threads, so that between the threads mechanical drive, although the local east and the surface a corona discharge takes place, the amplifier and the synchronous motor condense, causing charged particles to drop continuously on the surface work, an electromagnetically operated one must be stored. The polarity of the potential source 45

7 8

and thus also that of the transferred onto the surface by etching a correspondingly exposed photographic

Charge is the polarity of the charge on the image powder resistive layer or by an engraving process

Opposite particles that are applied to the development, as it is also for the technology of

the drum were used. Hence, the La- printed circuit prefers is known. If desired,

tion on the picture tape 42, the particles from FIG

Drum surface down. Obviously, the dielectric layer 50 must be embedded. Because it

The charge transferred to the picture tape must be large enough, however, the task of these conductors is to create electrical fields

by the force of attraction between the particles and through the uniform photoconductive insulating layer

the charge of the latent 56 formed on the drum through to generate the. covered them, they will

to overcome electrostatic image. It is preferable to do this on the surface of the dielectric

Here notes that many others are located in the xerogra layer 50.

Fig. 4 shows a sectional view 4-4 of the transfer processes shown in Fig. 3 in connection with the drum shown. This cut can be used by the invention. For example, drum along the top of conductors 52, 53 and the development can be done by magnetic brushes. The section also shows those parts of the following, as described in US Pat. No. 3,015,305, photoconductive layer 56 which lie between the conductors or through clouds of image dust, as in US Pat. No. 52 to 54. As in Fig. 4, covers the 2,918,900 described. The image transfer can be done by photoconductive layer 56 not the entire drum, through a high potential voltage source but only a part of the dielectric base roller connected directly to surface 50. It can also be seen that the conductor is arranged behind the image tape , where di & PoIa- their exit from the photoconductive insulating layer rity of the voltage source of the polarity, the picture on the right side via an insulating layer 50 is opposite to powder particles. An insulated end plate 57 can also be guided, the picture tape itself being made of the same material as the layer 50 in an adhesive manner with respect to the particles. In addition, the transmission can be 25 The conductors are connected to contacts 15, which are arranged on the right side of the plate 57 through a grounded conductive plate in order to establish connection with the sliding contact 13 behind the image tape at the point of transmission, and an impulse on the F i g lying in the drum. 5 shows in the same way as FIG. 3 an on-conductor with the same polarity as the charge of the other embodiment of the drum. At this two-image powder particle. Through this transferring embodiment, a number of electrical properties are repelled and separated parallel conductors 59, 60, 61, 62 and 63, i.e. the developed image from the drum onto the image borrowed from conductors 52 to 54 in FIG 3, transferred to a dielek tape. Embedded after transfer to the image Irish layer 64. This dielectric tape is attached to a fixing device 46. Layer is moved by a photoconductive insulating layer 66, which covers the powder image by means of heat treatment. Preferably, the thickness of the dielectric is permanently fixed on the picture tape 42. For the substance 64 between the conductors 59 to 63 and the present case, a resistance heater is shown as a fixing device for the photoconductive insulating layer 66, which is very thin. However, it can also be selected so that the electrostatic field, the fixing method known from others in xerography, apply a potential to the conductors in the photo, in which the dust image is exposed to or with a 4 ° conductive insulating layer built up through the conductors a coating is as strong as possible. In this embodiment it is sprayed. After fixing the image tape of the drum, the electrical input signal is wound onto a roller 47 for later use, and the amplifier winds it onto two adjacent rollers. After passing through the transmission, line conductors are moved in order to form a latent layer, the drum into a position in which it is exposed to light source 25 while exploring an electrostatic image on the drum, while its electric field is generated. In order to reach this to the line conductor grounded by a loop contact 20, you can use every other conductor, such as. B. 59, be. This will ground all of the charge on 61 and 63, while the intervening dielectric photoconductive pad is made up of conductors 60 and 62 with contacts 67 on the termination. Then the drum moves on such a plate 68 to be connected to the drum. An.Off cleaning brush 48 is passed, making it possible for an output terminal of the amplifier to be grounded, the new duty cycle being prepared. second connected to the sliding contact 13, so that In F i g. 3 is a partial view of an embodiment - the output signal of the amplifier is given to two adjacent forms of the drum structure, conductors lying one on top of the other from their end, if they can be seen, shown in a partial section. It consists of 55 sliding contact 13 the contact 67 of one of these conductors a dielectric layer 50 which touches on the rigid.

conductive and grounded base body 51 arranged The photoconductive insulating layer in the arrangement

is. On the dielectric layer 50 is a number according to FIG. For example, 3 or 5 can be made from

of electrically separated conductors 52, 53, 54, etc. amorphous selenium exist, its application in the divides which to each other and to the axis of rotation of the Zy- 60 Xerography in more detail in U.S. Patent 2,970,906

Linders run as parallel as possible, as it is also described from. Amorphous selenium should be used as a material

F i g. 1 can be seen. These conductors are very thin for the photoconductive insulating layer, preferably

and be chosen with a number of 75 to 350 conductors per inch as it provides excellent images and

distributed over the circumference of the drum. Can be used for many thousands of operations, depending on the requirements. It The image quality, cost, etc. can also be more or 65, but it should be noted that any other

fewer row conductors are used. You can also use suitable photoconductive insulating material

30 to 70% of the dielectric layer 50 cover. can be turned, if it is also photographically

The conductors can work more slowly on the dielectric layer than amorphous selenium and not short

9 10

can be used again after light treatment. The scanning head of the transmitter is a light source, an A prime example of such a substance is in a lens system and a photocell, which is arranged in a French process in particle form produced zinc, that a light spot generated by the light source oxide in a layer-forming insulating binding of the Transmission drum on the photocell reflects medium, such as polystyrene or polyvinyl acetate resin. 5 will. Therefore, if the scanning light passes over a white photoconductive insulating layer or a light area of the original image, a large amount of light can be reflected on the photocell, for example, on a dielectric underside, and the recording drum rend when passing over a dark or black with drivers and / or rollers are provided in order to absorb most of the light and only a little is reflected on a cut dielectric sheet with zinc oxide io the photocell. As a result, the potential of the drum that appears during an operation near the conductors at the output of the photocell must be maintained. After completion of the arrest proportional to the brightness or darkness of the passage, a new photoconductive insulation of the respective small surface element of the original layer can either be done by hand or by an automatic image which is being used at the respective point in time. B. the 15 is keyed. Since the speed at which the driver for the photoconductive insulating layer travels over the drum scanning head, in terms of being cyclically actuated by cams. In such a system, the speed of rotation of the drum is large, there is the possibility that the image is, the entire surface of the original image transfer step is separated from the entire rest of the process on the transmission drum line by line and the dust image directly on the surface ao wise scanned. As described above, that of the photoconductor can be fixed. Output of the photocell with a carrier in connection with Fig. 1 a spindle was mixed with frequency and transmitted wirelessly either by wire or reversing thread to realize the scanning to the receiver, which then described the mechanism to demodulate the explanation and this signal and amplify it before it to facilitate understanding of the invention. Let the sliding contact 13 be given. This is noted, however, that in practice scanning devices of one of the contacts 15 at the end of the drum 17 are used at a higher speed, since the connection. The transmission ratio between the pinion 27 on the spindle, which the thread is used for, allows much shorter scanning times, in view of the fact that in the present invention the gear wheel 26 on the shaft of the drum 17 and an unmodulated light source of high intensity 3 ° guidance of the carriage 29 is selected to be. Such a fast working scanning unit that the sliding contact 13 is one or more of the directions in FIG. 6 shown. It contains a light contact 15 touched during a time, the same source 74, a lens 76 and an aperture 77. One of the time for movement of the scanning light beam spot is projected onto a hexagonal mirror 78 over the full width of the photoconductive insulating layer which is mounted on a shaft 79 which is through 35 33 on the drum surface. This means that the one synchronous motor 80 is driven. After changing the input signal continuously on a passage through the diaphragm 77, the light from each or more of the conductors in the drum is given just the light source 74 opposite when the light source 31 is reflected on the carriage 29 gel surface of the hexagonal mirror 78 , and _ the photoconductive insulating layer 33 migrates directly over the activated conductor or conductors via the lens 81 to the cylindrical writing 40,
drum 17 that corresponds to drum 17 of FIG. 1 based on FIG. 3 it can be seen that if a

speaks. A 60 degree turn of the hexagonal electrical signal onto one of the conductors 52, 53 or Mirror 78 moves each of the light source just 54 given, between the conductor and the opposite one Partial mirror in such a way that the grounded conductive base 51 of the Tromihm shown reflected light beam from one end of the 45 mel an electric field is built up. While Drum 17 moves to the other end, like some field lines directly from the underside of the Leidie run through the ters drawn on the drum 17 to the conductive, grounded underside 51, Arrow is indicated. If the next partial mirror is standing, other field lines run from the top of this Light source opposite, the drum is made like conductor through the photoconductive insulating layer 56 in turn swept over by a light beam, so that 50 and then through this layer between scan the drum six times, in adjacent conductors and through the dielek-F i g. 6 from right to left, during an Um-Irish layer 50 to the grounded conductive underside rotation of the hexagonal mirror 78 results. The 51st Whether an electric field in the photoconductive Image signal is built up on the drum in the same way. Insulation layer 56 is or is not built up, therefore give, as in the invention described above, depending on whether a signal is on one of the conductors 1, and the rotational 52 to 54 acts or not. Its instantaneous speed of the drum 17 is regulated, the strength depends on the instantaneous value of the applied that they decrease with the scanning speed of the light source electrical signal. If the photoconductive iso matches, layer 56 is not exposed to light or other electro-In operation, an original image on the transmission 60 is exposed to magnetic radiation, so it remains in drum attached and the image transmitter switched on. their mainly insulating state, so that The transmission drum rotates at a speed, the charge carriers contained therein are only low or which have no mobility due to the frequency of their local oscillator. On the other hand, if ir- and the characteristics of their synchronous motor are determined by a part of the photoconductive insulating layer is. If the scanning head of the transmitter with the drum 65 is exposed to light, they are illuminated mechanically connected, the one-surface pieces start to become more conductive. As known, circuit of the local oscillator on the transmitter side, the charge carriers move in a conductor also the scanning. As described above, applying an electric field such that the

Claims (1)

11 12 The inside of the conductor becomes a field-free space with the fact that the conductor is then given the same potential at every point by an input signal. If z. B. which is controlled. The latent electro-surface of the photoconductive insulating layer, the upper static image, which is built up in this way, is then developed and applied to an image half of the conductor 53 in FIG. 3 lies, was lit, tape transferred as described above,
so that it became relatively conductive, while an electrical .5 The in FIG. 5 drum according to the invention shown on this Irish signal from the input amplifier works in a similar manner as the ge-conductor was given in Fig. separate conductor in the selenium layer, which is through a grounded conductive underside 51 that the free elec-. dielectric layer are separated from a common separated in the now conductive part of the photoconductive io grounded conductive underside, all insulating layer 56 towards the grounded plate 51 wan- conductors are embedded in the dielectric layer, the (provided that the applied signal nega- so that they are isolated from each other on both sides by tive polarity). It should be noted, however, that the alternating grounding of the conductors to replace the conductive charge carriers, although they may move through the illuminated sub-plate 51 of the photoconductive insulating layer shown in FIG. This alternating grounding of the conductors between the photoconductive insulating layer 56 can also be used in the arrangement according to FIG. 3 and the dielectric layer 50 are braked, as are turned. The mode of operation of this drum is independent of the lighting in its iso the same as that of the drum from FIG. 3, whereby the leaning state remains. In this example, the only difference is that the electrical then the negative ao-tric field migrating towards the underside 51 is built up completely from the inside of the dielectric charge at the boundary layer of the dielectric Irish layer 64 and becomes the photoconductive insulating layer between adjacent due to the curvature of the field lines through edges of conductors lying on each other, e.g. B. 53 and 54, braked, effect upwards into the photoconductive insulating and when the lighting is switched off, layer 66 is extended. Additional devices for these charges are attached to the boundary layer, since 25 xerographic plates, which are similar to those in Fig. 3, the photoconductive insulating layer then to their drums not shown and 5, are returned to the conductive state, whereby the movement already mentioned , the pending registration is again limited. wrote. This accumulated charge then builds its own It can be seen that in the area of the present field, after the input is switched off, and 3 ° invention many other substances, arrangements and this field forms the picture that later developed working methods can be used. Example will. The polarity of the components of the drum can be instructed from the accumulated charge in the transition zone and the polarity of the applied transparent material and the scanning lights are dependent on the signal, so that in the event of a negative source they can be arranged in their interior. Instead of a negative charge, with a positive signal on a cylindrical drum, a flat charge can also be used at the transition zone from the photoconductive plate, which is collected by moving it to the dielectric material. Each of the movements to the light source is scanned. Instead of thin conductors 52 to 54, together with that of a scanning device with a dielectric layer 50 on a slide and the common underside 51 arranged with spindle and reversing thread, each forms a capacitor so that a light source can also carry a reciprocating charge into it Each of these small condenser mirrors can be used, which stores the light of a generator. The application of a signal light source is projected onto the drum surface. A rotating six-charge accumulation at the transition zone of a square mirror fulfills the same purpose as such a "capacitor plate". Other methods of image transfer include the storage of some charge in 45 gung, e.g. B. sample current sampling of each of these small capacitors. In order to simplify the process circuits, pulse and code processes as well as many problems of this additional charge storage.
via the contacts 15 and a grounded grinding contact 16 short-circuited as soon as the photoconductive 50 claims:
The insulating layer is outside the area of the light 1. Method for converting an elekquelle 31 and the desired charge is stored by Irish signal in a graphic image, in particular the input signal at the transition zone between special for the image recording of image photoconductive and dielectric layer stored f unk signals, characterized is. 55 that the electrical signal to be converted over Since the instantaneous value of the signal received by the recorder a switch-on contact (13) is the electrical analog of that of the electrically separated, one side of a reflection strength of the insulating layer (56) that has just been photoconducted by the transmitter is the scanned surface element of the original image, and lengthwise firmly attached, parallel because the light source 31 of the receiver and the first conductors (e.g. 52, probe head of the transmitter work exactly synchronously, 53, 54) are switched is, which with their ends on the writing drum a latent electrostatic. (15) successively built up on the connection contact (13) image that is moved exactly past the original image so that this movement speaks through. In terms of its effect, the light source is therefore permanently assigned to the first conductor (e.g. 52, 53, a wandering optical switch that forms the 65 54) and at least one of the first conductors creates a latent electrostatic image on the (e.g. B. 52, 53, 54) caused by a thin dielectric point where he.sich intersects with one of the row conductor layer (50) separated second conductor (51) for in the writing drum, provided that the overall arrangement thus formed (50, 51 , 52, 53, 54, 56) takes place together that the photoconductive insulating layer (56) on its the conductors (52, 53, 54, 51) and the side facing away from the dielectric layer (50) by a source (31) strong electromagnetic radiation on lines whose projections with the first conductors (e.g. 52, 53, 54) coincide to form an electrostatic latent image is scanned, and that the beginning of the scanning of each first conductor (z. B. 52) with coincides with the time the signal is connected to this conductor (e.g. 52). 2. The method according to claim 1, characterized in that after switching on the signal and after being scanned simultaneously, the first (e.g. 52, 53, 54) and second conductors (51) are electrically connected to each other. 3. The method according to any one of the preceding claims, characterized in that the latent electrostatic image by sprinkling the ao scanned area of the photoconductive insulating Layer (56) made visible with finely divided, colored, electroscopic drawing particles will. 4. The method according to claim 3, characterized in that the by the character particles visible image from the photoconductive insulating layer (56) on a second image area (42) is transmitted. 5. The method according to claim 4, characterized in that after transmission of the image on the second image surface (42) to remove the residual charge, the photoconductive insulating layer (56) is uniformly exposed to strong electromagnetic radiation and that the conductors (e.g. 51, 52, 53, 54) must be earthed. 6. Arrangement for carrying out the method according to claim 1 to 5, characterized in that a photoconductive, insulating layer (33, 56) a plurality of electrically separated first conductors (52, 53, 54) are assigned adjacent, which of at least a second Conductors (51) are closely spaced apart by a dielectric fabric (50), the first (52,53, 54) and second (51) conductors being arranged on one side of the photoconductive insulating layer (56) while on the other side of which, opposite the first successive conductors (52, 53, 54), means (27, 28, 29, 31, 32) for scanning surface pieces of this layer (56) which correspond to the length of the first conductors (52, 53, 54) with a source (31) of strong electromagnetic radiation to which the photoconductive layer (56) is sensitive, and that means (13, 15) are provided for the electrical signal corresponding to information to be recorded switch to the successive first (52, 53, 54) and second (51) conductors as the first conductors (52, 53, 54) are scanned by the source (31). 7. Arrangement according to claim 6, characterized in that the first conductors (52, 63, 64) run parallel to one another at a small mutual distance. 8. Arrangement according to claim 6, characterized in that means (15,16) for electrical Connection of the first (52, 53, 54) and second (51) conductors after being scanned by the source (31) are provided. 9. Arrangement according to one of the preceding claims, characterized in that means (37) for the deposition of finely divided electroscopic drawing particles on the photoconductive insulating layer (56) are provided, whereby the electrostatic latent on this layer (56) Image is made visible. 10. Arrangement according to claim 9, characterized in that means (44) for transmission the image visible through the drawing particles from the photoconductive insulating layer (56) are provided on another surface (42). 11. Arrangement according to claim 10, characterized in that means (16, 20) are provided, through which any remaining on the photoconductive layer (56) after transferring an image electrostatic charge is balanced, causing the arrangement for renewed Ready to use. 12. The arrangement according to claim 11, characterized in that the means (16, 20) are the first (52, 53, 54) and second (51) conductors and that a source (25) of electromagnetic radiation at the same time acts uniformly on the photoconductive insulating layer (56). 13. Arrangement according to one of the preceding claims, characterized in that Means are provided that the point of use of the scanning beam according to the distance between two first conductors (52, 53) lying next to one another after each traversing one Define the line on the layer (56). 14. Arrangement according to claim 13, characterized in that the photoconductive layer (56) has the shape of a cylinder and that the means for determining the point of use of the scanning radiator rotate the cylinder about its longitudinal axis, while the scanning device (27, 28, 29,31 , 32) has a mechanism (27, 28, 29) which causes the cylinder jacket surface to be scanned in a direction parallel to its longitudinal axis. 15. The arrangement according to claim 14, characterized in that the means (13, 15) for connecting an electrical signal corresponding to the information to be converted to d ^; e first conductor (52, 53, 54) from a plurality of electrical contacts (15) on the end face of the cylinder, each of which is connected to only one of the first conductors (52, 53, 54), and from insulation between all contacts (15) and a fixed sliding contact (13) which is in connection with only one contact (15) during a scanning movement of the scanning source (31). Considered publications:
U.S. Patents Nos. 2576 047, 2,588,699, 618 551.2 618 552.2 777 957.2 918 900.2 970 906, 3,015,305. 1 sheet of drawings 809 627/1080 10.68 © Bundesdruckerei Berlin