DE2115947C3 - Method for recording and / or displaying information on a thermomagnetic recording medium and recording medium for carrying out the method - Google Patents

Description

The invention relates to a method for recording and / or displaying information a thermomagnetic recording medium, consisting of a substrate with small capsules is coated, the magnetic suspended in a transparent envelope in a carrier medium or contain magnetizable particles by applying a magnetic field.

Such a method is already known from German patent specification 11 86 907. With the one described there Method, a recording medium or a film is used, soft with very small translucent, a liquid-containing capsules is coated, being encapsulated in this Liquid magnetizable particles are suspended. The visible representation depends on the orientation the magnetizable particles contained in the capsules, d. H. depending on the orientation of the individual magnetizable particles, certain areas of the recording medium are transparent to light and others opaque. The different light transmittance results from that when a magnetic field is applied, the magnetizable particles within the carrier liquid be oriented in a certain direction while they are in the magnetic field-free areas Remain unoriented. The magnetic particles thus act like a blind, i. H. depending on theirs Orientation, they either let light through or not. A permanent record is with this one known methods and the film mentioned, however, not possible, since the magnetizable particles gradually lose their orientation again or any undesired magnetic field that occurs as well Orientation of the dimensionable particles influenced.

The invention is therefore based on the task a method for recording and'or display of information on a thermomagnclischen Specify recording medium with which a permanent representation of the recorded data can be achieved without losing out on the possibility having to do without a deliberate deletion of the recorded data.

According to the invention, this is defined at the beginning Method achieved in that the recording medium coated with the capsules in the

Exposure to the magnetic field to reduce the viscosity of the carrier medium is heated at the same time and then cooled down again to fix the '.! iformation.

Further useful developments of the method according to the invention emerge from the subclaims.

The invention also relates to a recording medium for carrying out this method, which characterized in that the carrier medium contained in the capsules for the magnetic or Magnetizable particles are solid at a temperature between 18 and 50 '' C, but at a temperature between 50 ~ C and the melting point of the Material, for example on the paper coated with capsules, which rests against a conductor surface, is transferred. With this procedure can the heat-sensitive recording medium against the one surface of the electrically and photoconductive Transmission medium are pressed, so that the recording medium in the form of a sheet, a Roll or a tape are present and a magnetic field can also act on this.

ο In the case of the transmission arrangement used on the surface principle, the photoconductive material has the shape of a plate on which the electrical conductors are intertwined or interwoven like a grid, so that when an optical

kapsclwandbildenden substance of the liquid substance 15 see pattern on the photoconductive substance i hd

The method according to the invention differs thus differs from the known in that the crsteren worked with a recording medium in which the orientation of the magnetizable particles contained in the capsules at normal Ambient temperature even in the presence of a magnetic field of the same strength as at Recording of the information to be displayed was used is persistent. Under normal ambient temperature a temperature between approximately 15 and 27 C is understood, but the same can vary Temperature range also up to about 50 C. Prevented within this temperature range the carrier the movement of the magnetizable particles. To produce a permanent data The configuration representing the magnetic particles is thus the combination of heat and a magnetic field is required.

Present on the thermographic recording medium small capsules have an average diameter of about 5 to about 1000 / in and particles can additionally contain a lichireflekticrcnden substance, which enhance the visual contrast of the existing through the magnetic orientation of the magnctisierbarcn particles within a certain range Rcflexionsvcrmös ^ ns .

It has been found convenient to create the image by means of a heat pattern in the presence of a magnetic field. This option is described in more detail below. The thermal pattern can be generated in very different ways, for example by means of a heated type or by infrared radiation, but a transmission medium is preferably used which converts an optical image into a corresponding one. Heat pattern implements.

There are two different types of transmission medium for the capsule-coated recording medium Principle-working arrangements in question, one of which is called the "Durchsirahlimiis .. principle and the other is called the!, surface principle. Applying the principle of radiation Arrangement consists of two parallel electrically conductive surfaces, which are photoconductive by a Substances are separated from each other, so that the latter is confused by an optical image a current from the one conductive surface dinches photolcitenden substance / u of the other conductor surface flows. As a result, local, i. ti. to the of that Light irradiated areas. Generates heat that Jn / one of the following on the w: ■ ^ vsensiu

Circuit is excited and the resulting heat pattern also increases the temperature of the capsule-coated recording medium to a value at which the magnetic particles can move freely within the capsules and are thereby able to produce a copy of the optical image. The active flame consists of a photoconductive layer on which the conductor strips are deposited, the odd-numbered leather strips being connected to one terminal and the even-numbered oil strips being connected to the other terminal of a voltage source. The optical image striking the photoconductive substance causes a current to flow from one or more conductor strips to respectively adjacent conductor strips within the illuminated areas of the image. The disfiguring heat acts on the heat-sensitive recording medium. whereby the magnetic particles get their "freedom of movement" within the capsules.

The drawing method according to the invention is suitable for this. Data for any length of time save, and also makes it possible to use the stored data independently of the recording device to be passed on to any location. This advantage arises particularly when the Capsules on a leaf-like substrate, such as Paper, film or on a glass plate. The capsules can also be on an endless belt or on a drum or disc. In this case the Recording media according to the invention for storing or delaying only briefly current Data is used, as is the case, for example, in calculating machines, where for example a Factor is only used for a short time and then can be deleted again. This essentially corresponds to a magnetic delay line with a relatively long Zcitperiodcn-C characteristic in contrast to electromagnetic Delay lines, the mode of operation of which depends on the build-up and breakdown of electric and magnetic fields. The stored data can circulate as often as required, for example for implementation a multiplication or also for other types of calculation is required. after which the data is deleted and, for example, by some other factor can be replaced. After the data has been fixed, neither the magnetic writing field nor the magnetic 1. reading field is still present, and e; it is possible to keep the lixieiten data up to deletion anyway Use of the presence of a magnetic field.

The invention is explained in more detail below with reference to drawings. In these shows

F i g. 1 is an enlarged sectional view of an embodiment of a capsule containing magnetic particles as used on the recording medium according to the invention;

F i g. 2 is an enlarged sectional view of another embodiment of such a capsule:

F i g. 3 is a sectional view of a recording material consisting of a substrate coated with said capsules, the magnetic particles within the capsules having a random distribution;

F i g. 4 is a sectional view. which is the orientation of the Illustrates magnetic particles within the capsules in the direction of the arrows;

F i g. 5 shows the representation of a positive image (dark image on a light background), which by means of the in FIG. 4 shown type of milk direction within the capsules is created;

Fig. 6 capsules with aligned magnetic particles enclosed within a transparent substrate;

F i g. 7 is a sectional view of a positive image obtained from the recording medium shown in FIG. in which all particles are oriented in the same direction can be made;

F i g. 8 is a schematic sectional view of the cine ' Coated medium sensitive to heat and a magnetic field to produce a recording an original image;

F i g. 9 a technical illustration of the situation of each part for a negative record;

10 is a schematic representation of the position the individual parts for a positive record;

11 is a schematic representation of the capsule coating, which illustrates the effect of a permanent magnet on the particles contained in the capsules;

12 shows an illustration of a modified one Capsule coating. which is the effect of a permanent magnet on the magnetic particles within of the capsules shows:

Figure 13 is a schematic representation of a heat and magnetic field responsive. coating disposed on an endless support for recording and displaying printed information; and

14 shows a schematic representation of a Heat and a magnetic field responsive coated arrangement to expose the contents of a memory.

As shown in FIG. 1, a capsule 1 consists of a transparent wall 2, which encloses a core, the magnetic particles 4, particles of a light reflecting fabric 5 and a movement the particle-inhibiting carrier 3 contains.

A similar capsule is shown in FIG. 2, the only difference being that the magnetic particles themselves are formed by capsules, the size of which is, however, much smaller than that of the capsules 1. These capsules can contain a dye or a pigment in order to improve the contrast between these capsules 4 and the remaining capsule contents, ie the carrier material 3 and the particles of the light-reflecting material 5 to increase. If a sharp visual contrast is not required, the particles of the light reflecting material i can also be omitted. In this case, however, it is wise to use a carrier material which has a higher light reflectance than the magnetic particles in order to achieve a contrast / wipe of the dark-colored capsules. A carrier material suitable for this case is, for example, stearic wax.

In Fig. 3 a record carrier is shown

ίο made of paper or other fibrous substrate 6 consists, the mil one of capsules 1 and egg iicm the binder 7 existing layer is provided Of course, it is also possible to place the capsule on the sub without the aid of a binding agent

'5 slral to be deposited. In Fig. 3 are the more magnetic Particles within the encapsulated substance the capsules 1 evenly and randomly distributed, d. h they are not yet any orientation Has been exposed to a magnetic field and heat.

In Fig. 4 is the same recording niaieria shown as in Fig. 3, in which, however, by means of a Magnets 8 and a heat source 9 aligned the magnetic particles within the capsules that .-. ic are in all capsules on de:

same se; ic are located. While the heat source * serves the purpose of the movement of the trapped Particles normally inhibiting carrier / ι liquefy and thus a movement of the particles to allow, the magnet 8 is used to see the magnetis To pull particles inside the capsules to the side facing it.

In FIG. 5 the according to FIG. 4 prepared on / calibration carrier shown, in which a magnet 8 is now attached under half of the substrate. wan heat sources 9 are arranged above the recording medium in order to produce a positive image (dark: Image on a light background). This B.Id comes about because within from selected areas of the recording medium the ma

⁴ "magnetic particles are drawn downwards. The: happens by the magnet 8, which draws the magnetic particles inside the capsules downwards within the heated areas, as indicated by the arrows. This causes the light-reflecting particles within the capsules η a el · displaced upwardly as g of F i. 5 can be seen is in the middle region of the record carrier, wc no heat to the capsules acts dii magnetic particles remain in spite of the action of the ma-magnetic field in its upper position, in which they were brought through the process step shown in FIG.

In Fig. 6 shows a recording medium in which the magnetic particles are less adherent Capsules within a transparent substrate f are arranged. Enclosing the capsules ir the transparent substrate 6 can for example by Pour the capsules in a transparent organic plastic, such as polymethyl

methacrylate, polystyrene, polyvinyl alcohol, etc. The capsules can be either randomly or uniformly distributed within the transparent substrate. As shown in FIG. 6 can be seen, the magnetic particles within the capsules can again

⁶ S are displaced downward in the direction indicated by the arrows with the aid of a heat source 9 and a magnet 8, whereby the light-reflecting pigment particles, for example titanium dioxide, at the same time.

be displaced upwards, as in I * i g. h is shown.

Using the I "i g. 7, the production of a positive image with the aid of the I" i g. t * illustrated recording medium illustrated. This can be achieved in that a magnet 8 is arranged above and a heat source 9 below the recording medium , whereby in the areas of the recording medium influenced at the same time by the magnetic field and the heat, the magnetic particles inside the capsules migrate upwards, as indicated by the direction of the arrows in FIG. 7 is indicated. At the same time, the light-reflecting pigment particles within this area are displaced into the lower half of the capsules. This picture can be fixed by teaching in the heat source. Of course, within unheated areas of the recording medium, due to the movement of the carrier material, neither the magnetic light nor the light-reflecting particles can change their position. For this reason, an image can be generated or an existing image can only be erased in those areas of the recording medium which are exposed to both the heat and the magnetic field. Of course, a negative image, ie a light image on a dark background, can also be used. be generated. This can be done by applying the magnetic field to the other side of the recording medium during the individual process steps.

In the one shown in FIG. In the example shown in K, an image 14 is displayed on the screen of a cathode ray tube 15 generated, which is transferred to a selected surface 2 (1 will. However, the image can also be generated by another optical device such as by a micro image reader. The projected image can be made by any color or light any combination of colors, the only limitation being that the The receiving surface or device must be sensitive to this part of the electromagnetic spectrum got to.

The receiving surface and device shown in FIG. 8, an opaque transmitter 16 is used, which converts the optical image into a corresponding or equivalent thermal pattern. The transmitter is produced by first depositing a thin gold layer 18 on a glass plate 20 and producing a fine electrode pattern by means of a known photo-resist process. A layer 22 of a photoconductive material such as cadmium sulfide is then deposited on this electrode pattern. The electrodes are connected to an electrical voltage source to allow current to flow through the electrode pattern. The resistance of the gold conductor tracks is so low that heating caused by the flow of current occurs only in the areas of a photoconductive substance activated by light.

Another element of the in FIG. The embodiment of the invention shown in FIG. 8 is the recording medium, which is formed here by a paper 12 coated with capsules.

The coating of the paper consists of a plurality of capsules 24 containing magnetic particles 25 and non-magnetic pigments 27 and a carrier 26, the viscosity of which can be selectively changed within a temperature range of 18 ° C. and the melting point of the substance forming the capsule wall. A heat-meltable substance in which the magnetic lights and the pigment particles are suspended can be used as the carrier. The recording takes place in such a way that an image is projected onto the transmitter, which converts this image into a

i "implements speaking heat music. This melts the carrier 26 contained in the capsules 24 so that the magnetic particles 25 move freely within of the carrier 26 and around the pigment particles 27 can move when the field of a permanent magnet or an electromagnet 30 acts on them. After passing the magnet over the heated areas in the in F i g. S through the direction indicated by the arrows allow the encapsulated substances to cool down again, creating the image is fixed and due to its color contrast in the individual image areas a visual Viewing permitted. This difference in contrast can be seen in FIG. 8, where the position of the magnetic Particles 25 within the three middle capsules occupy a different position compared to the other capsules and are aligned. As will be described later, it can be moved and grouped of the magnetic particles 25 when the magnet 30 acts in a certain position on different

3 ^fl nc way to be done. In general, the particles are moved so that the pattern can easily be seen when viewed from a particular direction. It should be pointed out that the electromagnet 30 can also be made so large that it covers the entire sheet of paper or also another recording medium. In this case, the electromagnet can be arranged in a stationary manner and, when the heat pattern is present, can be excited briefly or in pulses in order to move the magnetic particles within the capsules 24. If the image is to be erased, it is only necessary to heat the entire surface of the recording medium and to expose it to the action of the magnet. This changes the position and orientation of the particles within the capsules so that they no longer reveal the pattern of the original optical original image.

If an optical image is projected onto the surface of the transmission element 16 and electrical energy is applied to the lctz tcrc, then a heat pattern corresponding to the projected optical image is generated in the surface 22 of the transmission element 16 opposite the projection surface. The heat pattern is transferred to the coated paper 12 by conduction, thereby melting the carrier material in the capsules of the heated areas. Then the magnetic field is moved in the direction indicated by the arrows, whereby the magnetic particles 25 inncr-

half of the heated capsules are moved in the direction of the outer surface of the recording medium. By then cooling the capsules to a lower temperature or to room temperature becomes the image formed on the coated paper

fixed.

It should be noted that the capsules in their white State can be brought, as this example-

■ ·>

wise on the left rope of the i · 'i g. 9 can be seen. In this way, a black image can be produced on a white background when the magnet 30 is moved over the field of view. When viewed in the direction of the arrows, the image generated in this way is shown by the middle capsules in FIG. ^l ) shown. If the coated paper is in its white reflecting state, as shown for example by the pigment parts 27 in the lower part of the capsules in FIG. ¹ ), the coated paper forms a negative recording medium. since the light reflected from the original image produces a black, permanent record, as is illustrated by the magnetic particles 25 moving in the lower part of the three central capsules. If the IJiIiI is generated from a microfilm negative, for example, then the resulting image is a positive. If, on the other hand, the recording medium is initially in its blackened state, as is shown, for example, on the left-hand side of FIG. it forms a positive recording system, since the light that reefs on the surface of the transmission element creates a white image in the coated paper after conversion into a corresponding thermal effect, as can be seen from the position of the pigment particles 27 within the three middle capsules is. If the optical image is generated again from a microfilm negative, for example, then the finished, permanent copy is also a negative. This maturity of one and the same recording medium to act as a positive or negative recording medium enables great flexibility in the production of a permanent positive or negative copy regardless of the state of the optical information pattern. In the case of a positive recording sicm, the position of the magnetic field must of course be different from that of a negative recording sicm, as can be seen, for example, from the different positions of the magnets in FIGS.

After stabilization of the image by lowering the temperature of the recording medium to the ambient temperature, whereby the contents of the capsules is determined 24, the recording medium 12 can \ on the C'bertraguiigselemcnl removed and any use takes place. Ri'-a reuse. Recording medium is only necessary to heat this as a whole and to expose it to a magnetic field; which prepares this in the manner described above for the production of a positive or negative copy. It is also possible to first record the information on the recording medium in the manner described, then remove it from the transmission element and, for example, store it in order to later insert additional information on this recording medium in those areas which either do not yet contain any information or in which the Information has been deleted.

In Fig. 11, the magnetic particles 25 within the capsules 35 adjacent concentrates the poles of the magnet in the lower half of the capsules, whereby the carrier 26 is visible S ⁶ when viewed in the direction of the arrows at these locations. Although the magnetic particles are made of a dark-colored iron (III) oxide, the carrier material 26 covers the magnetic

Poles opposite areas, the dark areas, so that white areas are visible on a black background. In this exemplary embodiment, the heat-fusible material does not contain any pigment particles, since it itself has layers that are similar to those before pigment particles. The waxes used as fusible carriers can have various colors or color shells. Lin his good league box is achieved with a fabric with a milky appearance that contrasts well with the magnetic particles.

In 1- ι g. 12 is a further embodiment a suitable recording medium shown. This consists of small capsules 24, ifie lT 2

55

p,

fusible I storage solution 26 and needle or sheet metal sheets 25 are included. Are these particles oriented so that their longitudinal dimensions lie in a plane perpendicular to the incident light. then the projection area of these particles is much larger. than when they are oriented parallel to ikn auflallenden light beams. In the case of an orientation perpendicular to the incident light, the majority of the light rays are directed towards a magneiis. as is shown, for example, in the two capsules / between the magnetic poles in _{Fig. 12. A} s incident light is thus either absorbed or reflected depending on the properties of the particle surface this is the case, for example, with the capsules lying opposite the magnetic poles, then most of the incident light rays penetrate the capsules and are reflected by a layer of a.-corpus that is located below the capsules Pigments 27 can also be left out, as is the case in FIG.

In »-ig. 13 is an exemplary embodiment shown. in which the recording medium is located on an endless belt 41 ». This example illustrates a data display device whose advantages include the fact that a large number of dalenzcils can be listened to at the same time without a constant need to add a tendency, as is the case, for example, with the Daienherstellung is that the information to be displayed "beliebi« «eandcrt may be, wherein lediclich of supplied at the time in ormat.onsänderung energy Ii ΐ, ί ° ^cla _u ^r S ^cst e" by means of a cathode ray tube or other device in the case of th information reflect . light can be viewed, which is more comfortable for a wcsentl.ch Berachter than the representation auf_ a cathode ray tube, and that more than one color can be displayed. p .-? f ^endl0 outer ^{"C band 40 Trä} St on its

? Tn hh ^e "f ^V i ^{lzahI oF Ka} P * ^{In 24} · The capsules contain the carrier 26, the magnetic particles 25 and the non-magnetic particles 27. The Iragerstoff 26 need not necessarily be a 11; 1 ^ ^ä r ^{me SDI} melzbarer To be substance, but only needs to be sufficient at room temperature

n £ fri ^Un ? / - 5 ^{series of T} ™ temperatures sufficient ™ ^d , ⁿ | V1skos1t.il /.u own. The dispersed mechanical particles remain in the stabilized state

25 and mchlinagneüsdien particles 27 on (j around the high viscosity of the carrier 26 in their respective I; i "c. During the working state the carrier the viscosity is so low that the dispersed particles are free i can move when drawn by the magnetic field b / w. be displaced.

As can be seen from the left side of the lower half of the ball, the non-magnetic lights 27 are oriented in this way. that the tape appears white in this area and reflects light when viewed from the beginning. If you follow the course of the tape in (iegeiHihigerrichtung. Then you get / u a heat source in the form of a thermal printer 42. Tier / to apply a Wai mem pattern to the endless hand. Of course, a large number of these printing elements can be arranged in the manner of a matrix. the. to narrow a "-numerical character. By applying a \ on a cash register, an electronic computer or similar grain ²ⁿ in the electrical energy, selected thermal printing elements can be heated, whereby a pattern of capsules with sehniol / A content is generated on the belt 40. The field of a suitably arranged ² i> lilektroniagneten 44 attracts the black magnetic particles 25 and shifts them to the lower side of the capsules and thus to the surface of the belt, and so through them for so long the magnetic field are held until the carrier by ex * 3 - ¹ to reduce the temperature has solidified and thereby fix the information is ied. Thus moves the tape 40 to the term <id ^r uekelemcnten over, several lines of information can be displayed on a white background in the form of black characters. Of course, not all magnetic particles within a heated capsule are influenced to any extent by the magnetic field. For better clarity, a greatly simplified representation was chosen in the individual drawings.

On the right side of FIG. 13 is a deletion or restoring station which consists of a heat source 46 and a solenoid 48 which respect to each other and to the belt 40 so angeord- ^4S are net that all through the Lageverändcruiiii the magnetic Particle represented information is deleted. The heat source 46 can be reset in such a way that the contents of the capsules are heated over the entire bandwidth or that only selected areas can be heated and erased or reset by the magnetic field in order to be able to make corrections or to record further data. It should be noted that the system described above produces black characters on a white background. However, it is also possible that the recording medium is first brought into its black state and that white characters can thus be produced on a black background. Although a thermal printer was used to generate the thermal pattern in this example, it is possible to use other heat sources such as heated types or an infrared image projected on the tape. ^6s

In FIG. 14, a further exemplary embodiment is shown, which also implements a device for displaying information by incident reflected light. Fun transmission element 50 converts a projected optical image 52 into a corresponding heat pattern, which activates a film that is sensitized with a capsule layer. The magnetic field generated by Masinete 56 is used to wind the activated recording medium. The optical image 52 generated, for example, by a slide projector is projected onto the transmission element 50, which is heated on the exposed surface and thus converts the optical image into a corresponding warm pattern. The thermal insulation of the transfer element melts the carrier material contained in the capsules of the sensitive material coated with capsules. As a result, the magnetic particles 60 suspended in the fluid can graze as a result of the action of the magnetic field, which changes the fluid absorption properties and / or functional properties of the heated capsules. As can be seen in FIG. 14, the sensitive film 54 has a plurality of small capsules, each of which contains a mixture of black magnetic lights 60 and white non-magnetic particles 62 which are suspended in the heat-fusible carrier 58. Depending on the position son animal MAGN-dien! Eilchen 60 and i. \ C \ nichtmagnetisclien particles 62 within the capsules aullallende the light is reflected or absorbed enisveder.

After relearning the heat, the molten carrier solid and the particles 60 and 62 are read in their position representing a BiItI-

The carrier material that inhibits the movement of animal-encapsulated particles can either be tlerait that it gives a permanent, but heat-dissolvable image, or it can be designed so that it is a permanent one. "IciMlösdihares Bild ιμ <μ1ιι In the last-mentioned case, the carrier is such that it can be irreversibly converted into a permanent solid state. In the first-mentioned case, in which thermal erasure of the generated image is possible. the carrier material consists of a material that can be used at normal ambient temperatures. such as, for example, at room temperature, is not flowable. however, allows the magnetic particles to move at a slightly elevated temperature when a magnetic field is applied. Such a carrier material is normally test at normal ambient temperatures and is always liquid at a slightly higher temperature. In the last-mentioned state of the carrier, the magnetic particles are extremely mobile when exposed to a magnetic field of a certain intensity. so that orientation of the particles within the capsules can be achieved.

Examples of suitable carriers are various waxes, e.g. B. Tristearin wax with a " Melting range from about 65 to about 75 ° C; Paraffin waxes with a melting range of about 50 bi « about 70 ° C; such as purified earth wax with a melting point of about 56 to 58 ° C, paraffin wax with a narrow melting range with an initial melting point of about 60 ° C, beeswax, Spermacetus, carnauba wax, non-crystalline hydrocarbon wax with a melting range between 60 and 74 ° C, polyethylene wax, silicone wax; animal and vegetable fats; Petrolatum; Margarine, halogenated aromatic compounds

fertilize, such as p-didilobenzene with a Melting point between 65 and 70 C and chlorinated polyphenols that are solid at room temperature. In addition to the use of substances that are solid at normal ambient temperatures, it is also possible to to use as a carrier for the magnetic particles those substances which are in the temperature range mentioned are pasty or have such a high viscosity that the magnetic particles at It is essential that the consistency of the carrier can be changed so that it is viscous gcnui; is to prevent the particles from moving. ^ The solid state represents an infinitely high viscosity, but that is what is intended in the claim I used the expression of the viscosity change embrace this condition.

The magnetic particles contained in the capsule cores are, for example, iron oxides, FcO. FO

, g

Effect of a magnetic field practically no .o and

h E fl

(red and black), E. mustard flakes, Nickellk f Shl

Ability to perform movement. With slight warming however, the magnetic particles should also act when these carriers are used be easily movable in a magnetic field.

Examples of such substances are combinations and mixtures of waxes, such as Petrolatum, Sdiwcinefett or any of the above solid substances, and various inert liquids, the selection criterion is only their Ability to inhibit the movement of the ma- * ° Optical particles and the inertia in relation to the magnetic parts and the particles of the reflective surface Substance is inside the capsule. Inert liquids suitable for this purpose are flakes, nickle powder, stainless steel flakes. ! Barium ferrite, iron carbonyl, ferromagnetic alloys, such as alloys of nickel, cobalt and iron and zinc-nickel-ferrite alloys

gene.

Besides the use of the above mentioned macnctischcn Parts it is also possible to use spherical magnetic parts that themselves Capsules are. These magnetic particle capsules can have an average Durdimcsscr of about 1 to 20 / «m and The magnetic substances mentioned above can be in the same or a different substance as the large ones Encapsulated capsules included. The little ones

gg g

chlorinated polyphenyls, "for example, chlorinated di- 25 capsules containing large capsules can have a hl i il Dh K) up to 200 m onweien Di kli

phcnylc such as trichlorodiphenyl; Petroleumcum distillate c. Mixtures of aromatic and aliphatic hydrocarbons, such as mixtures, The approximately equal quantities of naphthenic and paraffin i

p g

Have a diameter of K) up to 200 »m. The small crcn Capsules can also hold dyes and / or pigments in order to counteract the reflection / wipe these little capsules and the

g g p

fincn to increase the contents of the large capsules, substituted or not with small amounts. Sd can-

biili h Eiidlilh i

contain substituted aromatic hydrocarbons and a boiling range of about 177 to about 2 (SO C. The viscosity of these substances at 38 C is about 30 to 100 Sayboldt-sce.

new for example black ice-scnoxidlcilchen with an average diameter of about 1 »m in a nucleus of tetraalkylnglycol dimethyl acrylate, who also have a black dye or a

As already mentioned, carriers containing pigments can also be encapsulated.

are used, which have a permanent, non-liabilty Image. Since these carriers are both at the usual ambient temperature and at Remaining in a solid state at a slightly elevated temperature is, in this case, a thermal change not possible. Examples of carriers of this type are tetraethylene glycol dimethacrylate. Styrene. Vinyl acetate, Vinyl chloride and substances that cause free radical polymerization or some other kind

by polymerization at a temperature of examples ⁴ 5 color pairs.

The contrast-enhancing dye should match the color of the light-blocking pigments contrast in the larger capsules. For example, it can be white, red, yellow, green, blue, or one have a different color that contrasts with the color of the light-retardant pigment. When Color for the particles of the light reflective pigment the above are also possible, but in combination with contrasting ones

spiclswcise 50 to about l50 ^r C, which makes them solid. As a result of the polymerization, for example the polymerization of free radicals initiated by ultraviolet light, these substances take on their solid, reversible state. One advantage of such a non-erasable carrier material is that after the carrier material has been converted into its irreversible solid state, the capsule walls can no longer remain intact to be able to strengthen. Examples of such substances are titanium dioxide, zinc oxide, magnesium oxide, fluorescent pigments made from zinc sulfide and cadmium sulfide, pearlescent pigments, aluminum flakes and red or differently colored dyes that contain one or more components of the carrier

to need. It should also be pointed out that the ⁵⁵ material are mixed or dissolved in this. The GE

solid irreversible carrier does not need to be a polymer. Rather, those reagents or combinations of different reagents can also be used which are suitable for bringing an initially liquid substance or a reversibly solid liquid substance into a solid, irreversible state at or above the ambient temperatures mentioned. When using the polymerization can Tetraäthylcnglycoldimclhacrylat advertising initiated by heat or ultraviolet radiation to ^6s.

Whichever method is used to fix the magnetic particles is weight ratio of the magnetic particles to the non-magnetic light-reflecting particles can be about 0.5 to 8: 1.

Except for the already mentioned core-forming stage In some cases / wake-up, it is a dispersant to use such as oleic acid sorhitan monooleate and sorbilan triolcat to make a uniform dispersion of the light reflecting particles in the carrier material during encapsulation to support. The concentration of these binding agents or dispensing agents based on dii A collection of pigments, d. H. magnetic particles plus light-backing particles, can / wiper

15 16

about 1 and 25 percent by weight vary and will be sen. In this example no light

preferably between about Γ0 and 20 per weight per reflective particles are used.

cent. The total concentration of magnetic and

non-magnetic (light-reflecting) pigments in capsule core-forming substance amount (in g)

The capsule core can contain between about 1N and 70 g

weight percentage based on the total capsule core barium ferrite 10

material vary. Preferably the total is sorbitan trioleate

Pigment concentration in the capsule core between (surfactant) 2

10 and 40 percent by weight. ^v

As a capsule wall-forming materials can be any to _{the above eenannten core-forming} materials (, nternal polymers are used, as for conventional _{phase) are about 12} to 15 hours in a Kueelmühle Liehe encapsulation may be used, such as _{ground in a with a Po} lyt _r onko _P f equipped with gelatine gum arabic; Polyvinyl _{tetes mixed alcohol will be} 140 cm * of a weight alcohol; Polyvinyl pyrrolidone and starch. Quite generally _{ρΓΟΖβη ϋ} ^ ΐΓwäßrigen gelatin solution of 55 C gegcmcin can be used such substances * 5 | are _just ren fi _{Met long amem} ° _Rüh the GeIac.ne outgoing Kapselwandbeslandigkeit when u _ne i _ö sun ₂₁₀₀ cm x ¹ for internal use a thermally vcrflüssigbaren carrier _phase g _{Csetzl Dic} Rührgeschwindickeil above is then aufwe.sen material and the sufficient _Cinem even with repeated thcr- _{erhölu "m ac} droplet and particle size in momagnetischen write Losch-Zyklcn _{section equipped only 10 to 2} () "to obtain _m, are stable and have a sufficient life * °, _{n eincn 3} _i_ _be cher 21 water of 55 C of the magnetic on / ecwährlei- calibration voltage caps _{and, 2} ο" η ^{slc 3} of a 11 weight percent rubber " ·. ,, .., _jr ,,. Arabic solution of 55 C. The internal production of the capsules can be achieved by _{using a multi- phase} emulsion Procedure take place, namely so _{ce The temperature and the pH of} the entire system is determined by chemical as well as mechanical * 5 _to f ₍₎ - ₍₎ , _{according to which} 50 _cm > a _weight per encapsulation process. zenticen aqueous Uv.unc of ethylene Nlaleinv.urc De-finished capsules can odt applied with Cinem Molekulaniewieht a suitable substrate as a coating on anhvIlrid-Copolvmcr: r in this ₆₀ (, O ₀ his 70 (100 and a pH of 9.0 7ucccingelagcrt . After a Ausfülmmgsbcispiel _{sem is Ansch} | _{icBcnd vv} i _r d of the pH by one, the capsules of the invention may in the upper loading 3 ° _{1Ucewicntsprozcnti £ cn} wäßrieen acetic acid solution rich of a paper or web panicrähnlichcn Eye- _lat i _{"on sarn} 7.0 reduced and then 50 cm 'required, which also contain synthetic fibers ner "2eewichtspro / cntigcn aqueous solution, which can be added to the glue, for example 6000 added. The pH machine is applied to the paper web or the web of an _{an- 35 mm thick area between 5 and 6} , (1 cinder fiber material can. In the _tc , _{u and let the system} cool down slowly, in this case no binding agent is required. If the _{rhyme Fneichcn e} i _ncr temperature of 28 C capsules em substrate, for example we paper. _{the system is cooled down to temperature} and it can be coated with glass or plastic. is _dcn j _{Ocm., an} aqueous 25gcwichtspnventigcn appropriate, a binder to be used, is added to a * ° Glutaraldchvdlösung. The capsules are uniform deposit and good adhesion _{then euva} J _{5 to lfi hg} c _rü leads. thereby hardening the capsules to reach the substrate. If _{After dcm Har, cn dcr} capsule walls is dav Rühzur deposition of this binder aqueous carrier _{rcn e} -, _necsle ji _{t and ma} n leaves the capsules in liquids used may adhesives _{EINCs z} - _{ci, raunls of 48} h at the bottom of 3-1-Bewie Starke, guar gum, gum arabic, sterkulicn- ⁴⁵ ^^ _abscl7cn The rubber, polyvinyl alcohol, gelatine, carboxy-methyl liquid standing above the capsule layer is removed by decanting. The ercellulose and water-soluble acrylates as binders _{holding thick} pudding-like capsule mixture will be used in. Throw the capsules on the other hand, _poured into the soO-em'-cup. With this Kapselsammen with an organic carrier fluid off _{mass WC} RDCN now a paper substrate and a Mylargelagert, then can be used as binder Polyvinylacc- ⁵ ° (p _o l _v äthvlenterephthalat) substrate coated. That did, polystyrene. Butadiene-styrene copolymers, polystyrene capsule layers are dried at room temperature, that is, rol-polybutadiene mixtures, solvent-soluble between 20 and 28 ° C. The dry acrylates and methacrylates, such as poly-capsule layer, is then coated with a layer of a methyl methacrylate, polybutadiene, nitrocellulose. 25 weight percent polymethyl methacrylate solution, rubber-based adhesives, ethylene vinyl acetate-Co- " _{coated in} ^ toluene and this layer will be used to dry poKmcre and Ccliuloscacctatbutyrat be _nc j
dcn.

In the following throw specific examples of the "■ el" ¹ Preparation of eifindungsgemäßcn capsules and

Inventive drawing-up Miiaicrials written ^6o This example illustrates the production

hen. "" of a thermomagnetically sensitive calibration

iHingsmaterials. in which a carrier is used

Example 1 is gc- in a permanent solid state

This example illustrates the manufacture of can be brought. For the production of cies magncli capsules and thermomagnetically sensitive recording material containing 65 see capsules

/ eichnuiiüsmalcrial. in the case of the magnetic barium fer- according to Example 1, throw instead of the tristcarin wax

riiteildieii used in a Triigcrstoff made of tristearin wax HiSg Tctraäthylcnglycol-Dimethacnlat,

in capsules from Gelaiine-rnimmiarabicum cingcsdilos- After applying the capsules to the substrate

and drying the capsule layer is achieved by heating and applying a magnetic field to form an image in the recording material. The for the required heating temperature (50 ° C) is maintained until the tetraethylene glycol dimethacrylate in a solid state poly-

is merized. In this way, the in the record carrier stored information is retained and the applied magnetic field can be removed will. Due to the irreversible solid state of the carrier, a permanent one is obtained Recording.

For this purpose 3 sheets of drawings

Claims (14)

Patent claims: 1. Method of recording and / or displaying information on a thermomagnetic Recording medium, consisting of a substrate coated with small capsules is the magnetic suspended in a transparent envelope in a carrier medium or contain magnetizable particles by applying a magnetic field thereby marked marked net that the recording medium coated with the capsules upon exposure of the magnetic field to reduce the viscosity of the carrier medium at the same time warms and then cools down again to fix the information. 2. The method according to claim 1, characterized in that on the surface of the recording medium generates a heat pattern and the entire surface of the recording medium Is exposed to a magnetic field. 3. The method according to claim 1, characterized in that the entire surface of the recording medium heated and the magnetic field is selectively applied to the recording medium. 4. The method according to claim 2, characterized in that that the thermal pattern by converting an optical image into an equivalent one Thermal imaging is done using a photoconductive transfer element. 5. The method according to claim 4, characterized in that the optical image by means of one Cathode ray tube is generated and focused on the transfer element. 6. The method according to claim 4, characterized in that the optical image of a transparent image carrier is projected onto the transmission element. * ° 7. The method according to claim 2, characterized in that the heat pattern by a heated type is generated. 8. The method according to claim 2, characterized in that the heat pattern is generated ^{by infrared * 5 red radiation.} 9. The method according to claim 1, characterized in that the entire surface of the recording medium heat and magnetic at the same time before information is recorded Field is exposed. 10. The method according to claim 9, characterized in that the magnetic field is applied to the surface of the recording medium carrying the capsules \ v ^; approx. 11. The method according to claim 9, characterized in that that the magnetic field on the ropes opposite the capsule coating of the recording medium is created. 12. The method according to claim 1, characterized in that the substrate carrying the capsule layer is an endless belt or a drum and that the information is recorded by successive or simultaneous application of Wi screens and a magnetic ^6s field to selected areas of the moving recording medium, and that is then cooled. 13. The method according to claim 12, characterized in that the recorded information briefly on the moving belt or the Drum stored and then by the simultaneous application of heat uad a magnetic field on the entire information-bearing Hache is deleted. 14. Recording medium for performing the method according to claims 1 to 13, characterized characterized in that the carrier medium contained in the capsules for the magnetic or magnetizable particles a solid, however, at a temperature between 18 and 50 ° C at a temperature between 50 "C and the melting point of the capsule wall-forming substance is a liquid substance.