DE2203861A1 - - Google Patents

Description

Sony Corporation, Tokyo / Japan

Registration medium for a point burn registration device

The invention relates to a recording medium for a spark burner registration device; it particularly concerns one metallized registration or recording paper on which the recorded image or the recorded Representation-is easily seen.

There is already a burn registration device known in which the image work by applying sparks on a metallized Recording paper is recorded, for example, as disclosed in U.S. Patent 3,074,066.

Such a recorder has an advantage that printing can be carried out at a higher speed with no noise and, moreover, that troublesome operations such as developing processing are not required when it is used for printing. A recorder of this type is not only used to record a letter, a figure, a mark or the like, but

it
the same for recording an image, such as one

Facsimiles, used.

However, a metallized paper used for such a recorder is formed only by coating a white paper with a metallic layer such as aluminum and the like; the (mirror) gloss thus obtained on the surface of the paper is great, which gives rise to the disadvantage that the recorded

209834/0757

Pattern seen from the back when light is transmitted but it can hardly be seen in reflected light. It is also already a recording paper has been developed in which a graphite layer and further a zinc oxide and the like. Containing Cover layer is formed on a white paper, but it has the disadvantage that dust and bad odor occur when a pictorial work is recorded on it.

In order to overcome these disadvantages, a recording medium has been proposed in which a graphite powder containing, black conductive layer is formed on a white paper, the aluminum layer through Vapor deposition or vapor deposition on the black conductive Layer is formed. This recording paper has an advantage that dust and bad odor do not exist occur and that the recorded pattern can be easily recognized because of the black conductive layer. It however, has the fatal disadvantage that the surface of the aluminum layer when stored during corroded for a long period of time, making it very difficult to store the record as it is. Furthermore, it has been found to be a disadvantage that the specular gloss of the aluminum layer is also great, as a result of which it becomes difficult to recognize the recorded pattern thereon at a certain position in relation to a light source.

In the case of a recording medium according to the invention, a metal layer with a rough surface is formed on a paper, which has, for example, a colored layer to create an irregular reflective surface results on paper, whereby the specular gloss is reduced to below 2Οί, preferably 15 *; Farther A non-conductive layer is formed, which is connected to the lower

209894/0767

Surface of the metal layer is in contact, so that the pattern recorded thereon can be seen with the naked eye and it is possible to store the record thereon for a long period of time.

In this invention, the size of the mirror gloss is determined by the "Methods of Measurement for Glossiness" (Method of measuring specular gloss), JIS Z 8741-1962, Japanese Industrial Standard (JIS) published by the Japanese Industrial Standards Committee have been determined or established. The measuring method will be explained in more detail later described.

Several exemplary embodiments are described below with reference to the drawing. Show it

Fig.l is a schematic side view of a

Burning (spark) recording device in which a recording medium according to the invention can be used is;

Fig. 2 to 11 (with the exception of Fig. 7) several enlarged ones Sectional views of preferred recording media of this invention;

7 is an enlarged sectional view of a comparative example a recording medium used in describing this invention.

In Fig.l igt the basic principle of a conventional (spark) combustion registration device is illustrated. With 1 is denotes a recording medium in which a conductive thin film, for example a vapor-deposited aluminum layer 3, is formed on a white paper 2. The recording or Recording medium 1 is between a conductive roller 4

209834/0757

and a platen 5 is inserted so that it is moved by a motor M. A recording pen 6 comes with the aluminum of the recording medium 1 vapor-deposited as a thin film or as a thin layer 3 on the roller 5 in touch. The recording pen 6 is attached to a device - not shown - so that the layer is scanned in a direction which substantially perpendicularly intersects the direction in which the recording medium is moved. When a signal voltage, for example a direct current or pulse voltage, is applied to the input terminals 7 and 8, the voltage in the will drop Near the recording pen 6 and thus the current heat (Joule heat) is concentrated on this point, whereby part of the vapor-deposited aluminum layer 3 is removed. As a result, holes whose sizes correspond to the supplied Stresses are proportional, again formed on the aluminum layer 3, so that a desired pattern, a desired mark or the like is recorded thereon.

However, the conventional recording paper fed to the recorder has the above-mentioned disadvantages that the (mirror) gloss of the aluminum layer is not only very great, but also that it is also very difficult is to keep the registry if it is a long period of time.

In the investigations on which the invention is based, it has been shown that a recording paper in which the aluminum film is vapor-deposited on the paper, which is smoothed onto its surface by a plastic coating, has a gloss of 76 * and a density of 1.68. It however, it was found that the aluminum layer on the paper contrasts poorly with the color of the paper

209834/0757

represents, making the paper unsuitable for recording. A gloss of 20? is made by roughening the surface formed by aluminum to be evaporated, whereby a density of 0.3 was achieved. the Tests have shown that this value is a limit for a practically satisfactory gloss, that a gloss of less than 2056 is a necessary condition for recording paper, and that a gloss and density of less than £ 15 and 0.16, respectively are desirable.

The tests with regard to corrosion of the aluminum layer during storage (when using different The colored layer materials such as pigment, dye and the like have shown that corrosion does not occur occurs when the aluminum layer is only in contact with a layer comprising conductive material, e.g. It contains conductive pigment, and the cause of corrosion is the formation of local cells from penetration from atmospheric water between the aluminum layer and the conductive pigment.

Registrars, taking into account the above aspects mentioned are formed are described in the following examples. As the thickness of the aluminum layer is not measured precisely in the examples due to the roughness, the vapor-deposited aluminum layer such that their surface resistance is 1.8 to 2.2 ohm / cm can be.

It is difficult to define the thickness of the aluminum layer as it is preferably in accordance with the voltage, current and the like used in recording is varied. It is practically desirable to control the surface resistance so that he

209834/0757

ρ
0.5 to 5 ohms / cm.

. Furthermore, the gloss is here by the "Method I", which is defined in JIS Z 8741-1962 was measured. At this Method is a parallel light that forms an angle of with a surface that is perpendicular to the surface of the specimen is fed to the surface of the specimen; a light reflected from the surface of the specimen is converted into a voltage, namely by a photoelectric cell that

is arranged on the line which forms an angle of 75 ° with the above-mentioned perpendicular surface. The specular gloss is represented by the ratio of an output voltage of the photoelectric cell in the specimen to an output voltage of the photoelectric cell of glass with a refractive index of I ₇₅₆₇ (instead of the specimen) when the gloss is in the latter voltage LooX.

The density or reflection density of the registered The pattern is measured by a Yamabe densitometer. This measurement is carried out with the naked eyes on one Compare where the density of baryta paper for a photograph is zero, with lights from two light sources be fed to the test piece or standard paper at an angle of 45 °.

example 1

As shown in Fig. 2, a black vellum paper 11 was coated with a polyethylene film 12; the The surface of the film was roughened by sandblasting using abrasive material having a grain size with an average diameter of 0.034 mm. An aluminum layer 13 was formed on a base consisting of

209834/0757

the polyethylene film 12 and the black Vellum 11 was, by vapor deposition of aluminum; thus became a recording medium 14 having a gloss

2 of 15 * and a surface resistance of 0.5 Ohm / cm. The density thereof was 0:13 and the density of Velinpapiers in the holes or Registered patterns was l _r 70 (in the case of a registration by a recorder as shown in Pig.l) to give a registered pattern with a high contrast at a density difference of l _f 57 resulted.

Example 2

Cellulose acetate dissolved in acetone was applied as a layer to brown glassine paper and in dried in an atmosphere of 7Οί moisture. Because of the moisture was on the surface of the cellulose acetate layer formed a kind of mat with a thickness of 0.5 to 1 micron. A recording medium with a gray Surface was made by aluminum vapor deposition on the surface achieved. The recording medium had an upper

surface resistance of 1.2 Ohm / cm, a gloss of 13% and a density of 0.13.

Example 3

Binder (vinyl chloride acetate copolymer,

e.g. that under the trade name b «k« nftt ·

Vinylite VYHH

Spirit black (color soluble in oil) Magnesium carbonate (pigment for setting the roughness

Magnesium oxide (pigment to adjust the roughness)

Solvent (mixture of cyclohexanone and acetone)

209834/0757

10 & 0.1 G 2 G 1 G 65 G

The above composition completely mixed by a ball mill was coated by a roller applied as a layer on white paper of fine quality and dried; then was on the layer of Composition: vapor-deposited aluminum.

Fig. 3 illustrates the structure of the recording medium, that is a sheet 31 of fine quality white paper, a non-conductive pigment layer 32 that is colored with paint and is formed on the sheet 31, and comprises a vapor-deposited aluminum layer 33, which on the pigment layer 32 is formed.

The surface of the vapor-deposited aluminum layer 33 obtained in this example had a gloss of 13/ 5% and a density of 0.15. When the recording medium was moved by pulse signals of 300 Mysec and a DC voltage of 30 V at a recording speed of 60 cm / sec (using the device shown in Fig. 1), the density of the exposed base layer was 1.70. In this way revealed; a black, cleanly recorded pattern with a high contrast of the density difference of 1.55. The surface resistance of the recording medium was 1.2 ohm / cm. There was no disappearance, no contamination, and no damage to the recorded pattern of the recording medium resulting from electrical corrosion of the aluminum layer after leaving the recording medium in an atmosphere with a relative humidity of 95? had been exposed at normal temperature.

As mentioned above _} in this example, the layer containing the non-conductive pigment can adjust the roughness of the evaporated aluminum layer and the color used in the layer for the coloring material; the

209834/0757

The gloss of the vapor-deposited aluminum layer can be reduced without the use of any special means will. Furthermore, if the layer which enables the roughness and coloring is non-conductive, then becomes A recording medium of good quality is achieved without the electrolytic corrosion between the aluminum and the above layer occurs.

Example 4

As illustrated in Fig.4, a first Layer 42 of non-conductive pigment on a sheet of fine quality white paper (the same as that of Compilation of example 3) formed. Next, a second layer 43 was made on top of the first layer 42 non-conductive pigment applied in a thickness of 1 to 2 My, which consisted of an alkyd synthetic resin coating, which contained barium sulfide with a grain size smaller than the grain size of the first mentioned Layer 42 of non-conductive pigment; on the second layer 43 was then the vapor-deposited aluminum layer applied.

In this way, a recording medium with a gloss of 7 * 2? and a density of 0.10 is achieved. The recording medium did not corrode after being in a relative humidity atmosphere for one week from 95? exposed at normal temperature had been.

In this embodiment, since the first layer of non-conductive pigment was able to reduce the roughness of the surface and the coloration, and the second layer 43 of non-conductive pigment an adjustment of the Surface roughness made possible that was finer than that

209834/0757

of the first layer 42 of non-conductive pigment resulted in a surface of good property which is suitable for
the registration of an image such as a facsimile is suitable.

Example 5

Cellulose acetate butyrate Io g

Blue oil G 0.1 g

Magnesium carbonate 2 g

Magnesium oxide 1 g solvent (mixture of cyclone hexanone

and acetone) 65 g

The above composition, completely mixed together by a ball mill, was applied onto a fine quality white paper by a roll coater and dried; then aluminum was evaporated onto the layer of the composition. Thus, a recording medium with a gloss of 1H% and a density of 0.15 was obtained, which was hardly susceptible to corrosion.

Example 6

Cellulose acetate butyrate Io g

Magnesium carbonate 2 g

Magnesium oxide 1 g solvent (mixture of cyclohexanone

and acetone) 65 g

As can be seen from Figure 5, a layer 52 was made of non-conductive pigment having the above composition formed on a black paper 51, which is covered by a non-conductive Paint had been stained; then an evaporated aluminum layer 53 was formed on the layer 52. It resulted

209834/0757

This is a recording medium with a gloss of I ² I % and a density of 0.15 that hardly corroded. In this example, since the sheet was colored by color, the layer 52 of non-conductive pigment only had to adjust the roughness of the surface; thus, a recording medium was obtained through a simple treatment.

Example 7

As shown in Pig. 6, a colored layer k 2 of non-conductive black paint was formed on a sheet 61 of fine quality white paper; a layer 63 of non-conductive pigment having the same composition as described in Example 6 was formed on the colored layer 62; then an evaporated aluminum layer 64 was formed on the layer 63. In this way, a recording medium having the same gloss and density as in Example 6 was obtained with hardly any corrosion.

In addition, non-conductive inorganic pigments can be used as materials for adjusting the roughness such as calcium carbonate, borium sulfate, aluminum oxide, Aluminum trihydrate, magnesium carbonate, magnesia, titanium oxide and the like, and glass powder. As color can be others oil-soluble paints, paint for coloring synthetic resins, and the like. Can be used. It can also be a non-conductive organic Pigment can be used, such as carmine lacquer, which has both the function of a color and the function of a Has adjustment of the roughness.

A metal of a vapor-deposited layer is not on Aluminum is limited, but it can also be a corrosion-free aluminum alloy that contains other materials, like e.g. 2 to 3? Magnesium and impurities, such as e.g. copper, silicone, Elsen, manganese, zinc, chromium and the like below about 0.3%, each to aluminum.

209834/0757

An oil coating on the vapor-deposited layer of the recording medium improves the burn registration continues the spot burning effect and prevents mechanical damage from scanning the recording pen originate.

Figure 7 illustrates a comparative example of a recording medium used in describing this invention. As shown in FIG. 7, an alkyd synthetic resin containing carbon black with a grain size of 0.02 to 0.6 μm was applied as a layer to a white velvet paper 71 on which a colored layer 72 of conductive pigment was formed; an aluminum layer 73 was formed on the layer 72. A recording medium with a surface gloss of 9% and a density of 0.12 was thus achieved.

An image created by the device shown in Fig.l was recorded on this recording medium had sufficient contrast.

The colored layer may be formed using lead oxide, iron oxide and the like instead of carbon black to achieve a high contrast image.

However, there is a partial disappearance of the aluminum layer when the recording paper is stored for a long time.

To determine the cause, the evaporated aluminum layer that formed on each conductive pigment was used was examined for its corrosion effect by adding the percentage by weight of acetylene black to a binder was varied.

209834/0757

The result was the following:

Acetylene black
(manufactured by Electrical Chemical
Industry Co., Ltd.) Weight sJ » 2% 3.5Ϊ 6% Resistance of the coated
Surface (ohm / cm ² ) 2xlO ⁷ 8 _f 5xl0 ⁵ 1, IxIO ²¹ Time of occurrence of corrosion
after exposure to atmosphere
a humidity of 65? at
normal temperature 36 S.td. 15 hours Time of occurrence of corrosion
after exposure to atmosphere
a humidity of 9OJ8
normal temperature 48 hours 10 hours 10 hours

As can be seen from the above results, even when the amount of the Acetylene black was small and the surface resistance was high, like

7 2 e.g. on the order of 10 'ohm / cm.

The tests have shown that the cause is the humidity in the atmosphere and that the aluminum layer is due to the formation of local cells is dissolved by placing water between the aluminum layer (with a thickness of 0.001 to 0.5 My) and the colored layer of conductive pigment arrives.

The experiments on which the invention is based have also shown that the above-mentioned disadvantage is eliminated, by forming an electrically insulating layer which

209834/0757

a waterproof synthetic resin film and the like, and non-conductive material between the colored layer and the aluminum layer if the colored layer contains such a conductive or semiconductive pigment is formed.

Example 8

When an insulating layer 83 made of vinylidene chloride was formed to a thickness of about 1 µm by dipping it between a colored layer 82 and an aluminum layer 84 using the same material as the recording material of the above-mentioned comparative example (see Fig. 8 ), the result was a recording paper with almost the same gloss and the same density as that of the comparative example. There was no shrinkage of the aluminum layer after the recording paper was exposed to an atmosphere having a relative humidity of 90% for 48 hours.

In the following examples, a conductive pigment is used for a colored layer; the ones shown Recording media do not have the disadvantages mentioned above.

Example 9

A colored layer of conductive pigment of carbon black was formed on a white paper; one semi-transparent layer of a mixture of polyester resin and magnesium carbonate was stained on the Layer formed with a thickness with which the black colored lower layer was not optically covered; and then aluminum was evaporated on the semitransparent layer to give a recording medium.

20983A / 0757

In this way, the gloss of the aluminum surface was reduced to b% due to the semitransparent layer and the density was O.13. At this time, the density of the exposed portion of the base layer removed by an electric signal (using the means shown in Fig. 1) was lj70, so that a registered pattern of high contrast density difference of 1.57 was obtained. Furthermore, no corrosion or electrolytic corrosion occurred in the recording medium after it was exposed to an atmosphere with a relative humidity of 90Ji at normal temperature.

Example 10

In this example, the type of carbon black in Furnace Black Seast 3H (from Tokai Electrode Manuf.) changed that was used in a percentage of 3/5 to a binder; a mixture of a phenolic modified alkyd synthetic resin and a barium sulfate powder (as a material for adjusting roughness) were applied the colored layer applied; then a vapor-deposited aluminum layer was applied to this mixture.

Thus, there was obtained a recording medium with a gloss of 125S under a relative humidity of 90% and no corrosion occurred at normal temperature.

Example 11

The same recording medium was produced as in Example, with the exception that MA100 (manufactured by Mitsubishi Kasei Industrial Co., Ltd.) was used. In this example, the same effect as in Example 10 is achieved.

209834/0757

Example 12

As illustrated in Figure 9, a sheet 91 was made with conductive pigment 92 coated with an insulating Film 93 was covered, and then an evaporated aluminum layer 94 was formed on the insulating film 93.

In this embodiment, almost the same effect as in the above examples was achieved.

Example 13

As shown in FIGS. 10A to 10C, a colored layer 102 of conductive pigment having a comparatively small grain size was formed on a sheet 101; then, an insulating layer 103 made of polyethylene and the like was formed on the colored layer 102. The surface of the insulating layer 103 was less rough, and so was a rougher surface (see FIG. 10B) is formed 104, and that an abrasive having a grain size of mean diameter of 0.03 J ¹ mm by sandblasting to 0.02. A vapor-deposited aluminum layer 105 was then formed on the surface 104, as shown in FIG.

This resulted in a rough surface of the vapor-deposited aluminum layer with a gloss of 15% . Since the insulating layer 103 which electrically insulated the conductive pigment 102 from the evaporated aluminum layer 105, no electrolytic corrosion occurred.

Example 1 * 1

As Fig.11 shows, a colored layer was made conductive pigment 113 applied to a sheet of good quality white paper with a rough surface 112, the

209834/0757

contained a lot of clay; it then became a vapor-deposited aluminum layer 115 is formed over an insulating layer 114 on the layer 113. It thus became a surface of the Aluminum layer with a gloss of $ 12.5 and one Achieved density of O.16; it did not corrode on one relative humidity of 90 pounds and normal temperature.

Example 15

A layer containing carbon black was formed on a base paper, cellulose varnish with dispersed Silica airgel was thinly applied to the colored layer and then evaporated onto this cellulose varnish Aluminum layer formed. A white and less shiny vapor-deposited surface with a $ 11 luster and a density of 0.07 was achieved; it did not corrode even in high humidity.

The fineness of the silica airgel from 0.05 to 0.3 My grain size forms an extremely fine, rough surface. There Furthermore, the silica airgel is transparent so that it does not shield the black base becomes a recorded Achieved high contrast patterns.

Fingerprints are often left on a surface with such a fine bump. About leaving behind To avoid fingerprints, transparent powder, such as glass powder with larger grain size, can be used in the Cellulose varnish layer can be mixed in to form a fine uneven surface of this layer, which the largely uneven surface of the colored layer covered; this way better results are obtained.

209834/0757

Example 16

A black conductive pigment was applied to a paper as evenly as possible; on this black head Pigment layer was a transparent varnish in a more suitable Thickness applied; then an embossed roller or a roller made by sandblasting with a grain size of 0.028 mm had been roughened, rolled over the transparent lacquer surface, creating a dotted with irregular spacing Surface or an uneven surface was formed, and then the aluminum was evaporated thereon.

Thus, in this example, the same effects as in the above examples were obtained.

In the above Examples 8 to 16, for the conductive pigment, acetylene black and the like were used, and they may however, colors containing conductive inorganic pigments such as Minium (Nennige) are also used, Rouge (English red), chromium oxide and the like with 0.02 to 0.6My grain size.

Although preferred embodiments have been described with reference to the drawing, it goes without saying that numerous other embodiments are possible within the scope of the invention.

209834/0757

Claims (12)

Claims 1.) Recording medium for a spark recording device, containing a base with at least one layer and a metal layer formed by vapor deposition formed on the base and made of aluminum or aluminum alloys, thereby characterized in that the layer of the base in contact with the metal layer is not Contains conductive material, the metal layer has a rough surface and the gloss of the metal layer is lower than is 2Οί. 2. Recording medium according to claim 1, characterized in that the base is colored. 3. Recording medium according to claim 1, characterized in that the base contains a colored layer and a layer, which is in contact with the base and does not contain any conductive material. ¹ J. recording medium according to claim 1, characterized in that the base comprises a paper, a shaped on paper, pigment-containing layer and a layer which is in contact with the metal layer and contains non-conductive material. 5. recording medium for a spark burning registration device, characterized in that at least one layer having base is provided that further comprises a non-conductive material formed on the base Insulating layer is present and that a metal layer is provided, which is formed by vapor deposition on the insulating layer is formed and made of aluminum or aluminum alloys, the luster of the metal being lower than is 20 years old. 209834/0757 6. Recording medium according to claim 5, characterized in that the base is colored and the insulating layer is not
is opaque. 7. Recording medium according to claim 5, characterized in that the base contains a colored layer. 8. Recording medium according to claim 7 »characterized in that the colored layer contains conductive pigment. 9. Recording medium according to claim 8, characterized in that the insulating layer has a transparent layer and one Layer which is formed on the transparent layer and contains non-conductive particles. 10. Recording medium according to claim 6, characterized in that the colored layer contains color. 11. Recording medium according to claim 10, characterized in that the insulating layer is non-conductive particles
contains. 12. A recording medium according to claim 1, characterized in that the base comprises a first layer and a second colored layer which are in contact with the metal layer
and contains non-conductive material. 209834/0757