JPH01130970A - Electrostatic printing and master plate therefor - Google Patents

Abstract

PURPOSE:To obtain a number of printed matters speedily by using a printing master plate with an insulative pattern layer of a corresponding positive or reversed negative image to image symbol information formed on a heat-conducting base with a conductive layer on the surface layer part. CONSTITUTION:The heat-conducting base of an electrostatic printing maser plate has a conductive layer on the surface layer part. The heat conductivity allows a heat signal to reach the other surface of the base when said signal is transmitted from one surface of the base. A laminated body consisting of resin or paper film and a conductive layer, a metallic plate foil and a conductivity-treated paper are used as the base. In addition, the conductive layer has conductivity and is made of a material with a specific resistance of less than 10<10>OMEGA.cm. Gold, silver and copper or their alloys and oxide alloys are used for the conductive layer. An insulative pattern layer of a corresponding positive or reversed negative image to image symbol information is formed on the surface of the conductive layer. Consequently, when this printing master plate is charged, the insulative pattern layer surface of the positive or negative image is charged. However, the conductive layer surface is not charged because it is electrically conductive. Therefore, a plurality of printed matters can easily be obtained speedily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrostatic printing method and an electrostatic printing master plate used in the method.

[Conventional technology]

Electronic printing is performed by applying the electrostatic transfer process of toner image symbols in the electronic recording process, for example, by uniformly charging a photoconductive layer of ZnO provided on conductive treated paper, and applying the photosensitive layer to the photoconductive layer. exposing the layer to an image symbol to form a latent image;
This is developed with toner, and then the toner is allowed to adhere to a certain extent to prepare a printing master plate in which an insulating pattern layer corresponding to image symbol information is formed on a conductive substrate having a photoconductive layer on the surface layer. Next, this printing master is uniformly charged and uniformly irradiated with light to leave the insulating pattern layer charged, and then developed with toner charged to the opposite polarity, and then the toner is transferred to a suitable transfer medium. , take hold. The latter step described above can be repeated to print multiple copies.

In addition to the printing master plate preparation method using electrostatic photography described above, a printing master plate is also available in which a thermal head is operated by an electric signal corresponding to image symbol information to transfer thermal ink from a thermal transfer film to a photosensitive sheet. There is a method of forming a printing master plate (Japanese Unexamined Patent Publication No. 59-17567), and using this printing master plate, it is possible to print a large number of copies by repeating the latter half of the process.

Image symbol information is converted into electrical signals using a word processor, facsimile, etc., the above printing master plate is created based on the electrical signals corresponding to this image symbol information, and if electrostatic printing is performed, printing devices such as thermal head printers can be used. It is possible to quickly obtain a large number of printed matter compared to when printing with .

[Problem that the invention seeks to solve]

However, in conventional electrostatic printing methods and printing master plates, light sources, focusing devices, lenses and mirrors, etc. This requires expensive optical members, and the printing device becomes bulky and expensive.

Furthermore, the photoconductive layer formed on the conductor base as a photosensitive material is an amorphous selenium vapor deposited layer or a zinc oxide layer, and therefore,
The cost required to produce a printing master plate is not cheap.

Further, when using a printing method and a method of directly transferring from a printing master plate to a printing material, the image on the printing master plate must be a left-right reversed image. Generally, in the case of optical means or an electric signal output system, it is possible to output a reverse image within an electric device, but this is complicated and expensive.

This invention was made based on the above-mentioned background, and its purpose is to print using a small and inexpensive printing device without the need for expensive optical members or electronic conversion devices to reverse images. To provide an electrostatic printing method and an electrostatic printing master plate capable of producing a reverse image printing master plate by using versatile and inexpensive raw materials, and by which a large number of prints can be quickly obtained. .

[Means for solving problems]

The above problems are solved by the electrostatic printing method and electrostatic printing master plate of the present invention. That is, the first electrostatic printing method according to the present invention is characterized by including the following steps.

(a) Layering a heat-conductive base material having a conductive layer on at least the surface layer and a heat-sensitive transfer film having a heat-sensitive insulating resin layer formed thereon so that the conductive layer and the heat-sensitive insulating resin layer are in direct contact with each other. Step (b) A step of activating a thermal head from the base material side using an electric signal corresponding to the image symbol information to transfer the pressed and heated heat-sensitive insulating resin onto the conductive layer surface (c) Transferring the heat-sensitive insulating resin from the base material side Step of peeling off the thermal transfer film along with the untransferred portion of the resin to form an electrostatic printing mask (d) Charging the electrostatic printing master plate to form an electrostatic latent image, which is then developed with toner charged to the opposite polarity. and then transferring the toner image to a transfer medium. In a preferred embodiment of the present invention, the heat conductive substrate is a conductive treated paper, which is composed of a heat conductive film and a conductive layer.

Further, the second electrostatic printing method is characterized in that it includes the following steps.

(a) A heat-conductive base material having a conductive layer on at least one surface and a heat-transferable heat-transferable heat-sensitive insulating resin formed on the conductive layer and a transfer paper; (b) A process of driving a thermal head from the base material side with an electric signal corresponding to the image symbol information to transfer the pressed and heated heat-sensitive insulating resin to the transfer paper ( c) forming an electrostatic printing master plate by peeling off the transfer paper together with the transfer portion of the heat-sensitive insulating resin from the base material; (d) charging the electrostatic printing master plate to form an electrostatic latent image; A process of developing with toner charged to the same polarity and then transferring the toner to a transfer medium. The invention is characterized in that an insulating pattern layer with a positive or reversed negative image is formed.

In a preferred embodiment of the electrostatic printing master plate according to the invention, the insulating pattern layer consists of a resin having a specific resistance of more than 10 12 Ω·cm and the conductive layer consists of a material having a specific resistance of less than 10 10 Ω·cm.

In another preferred embodiment of the electrostatic printing master plate according to the present invention, the heat conductive base material is composed of a resin film and a conductive layer, and the conductive layer is formed by metal vapor deposition by vacuum deposition, sputtering, or ion plating. The metals forming the conductive layer include gold, silver, copper, platinum, lead, zinc, cadmium, nickel, cobalt, tin, indium, aluminum, magnesium, titanium, beryllium,
It is lithium, gallium, selenium, tellurium, chromium, manganese, antimony bismuth, an alloy thereof, or an oxide alloy thereof.

Furthermore, in another embodiment, the thermally conductive substrate is metal foil or conductive treated paper.

The invention will be explained in more detail below.

Electrostatic printing master plate The electrostatic printing master plate according to the present invention has an insulating pattern layer of a positive or reversed negative image corresponding to image symbol information formed on a heat conductive substrate having a conductive layer on at least the surface layer. It is something that has been done.

The heat conductive base material in this invention has a conductive layer on at least the surface layer portion and has a predetermined heat conductivity. This heat conductivity is such that when a thermal signal is sent from one side of the base material using a thermal head or the like, the signal can reach the other side. Such embodiments include, for example, a laminate of an electrically insulating or conductive material and a conductive layer provided on the surface of the material, and a material that is entirely conductive.

Examples of such materials include a laminate consisting of a film made of resin or paper and a conductive layer provided on the film, a metal plate or foil, and conductive treated paper.

Note that when using an electrically insulating material, it is desirable to add a heat conductive substance or to reduce the thickness of the insulating film so that the above heat conductivity is ensured.

As the material of the resin film that can be used here,
For example, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polystyrene, ethylene-acrylic acid copolymer, ethylene-methacrylic acid, ethylene-vinyl acetate copolymer, saponified ethylene-vinyl acetate copolymer, ethylene-α -Olefin copolymer elastomer, acid-modified polyolefin, styrene-butadiene-
Acrylonitrile copolymer, polyamide, polycarbonate, polysulfone, polyacetal, polymethyl methacrylate, polyphenylene oxide, polyurethane,
Examples include polyethylene terephthalate, polybutadiene terephthalate, nylon, etc., as well as single substances or mixtures thereof (coextruded films, etc.), and laminates.

The conductive layer provided on the heat conductive base material is electrically conductive, and is made of a material having a specific resistance of less than 10 10 Ω·mark, for example. For example, gold, silver,
Copper, platinum, lead, zinc, cadmium, nickel, cobalt, tin, indium, aluminum, magnesium, titanium, beryllium, lithium, gallium, selenium, tellurium, chromium, manganese, or antimony-bismuth or alloys thereof and oxides thereof There is an alloy. This conductive layer can be formed by pasting the above-mentioned metal foil onto a film, as well as by vacuum evaporation, sputtering,
Alternatively, it can be formed by an ion plating method. The thickness of this metal vapor deposition layer is such that it can impart electrical conductivity to this base material, and is, for example, 10 to 100% thick.
00A, more preferably 100 to 1000 angstroms.

In this invention, a heat-sensitive coloring layer can be provided on the opposite side of the conductive layer of the heat-conductive base material. With this aspect, the correct image of the image symbol information can be visually observed from the opposite side of the conductive layer of the heat conductive base material.

The printing master plate according to the invention has on the surface of the conductive layer an insulating pattern layer of a positive or inverted negative image corresponding to image symbol information.

In the present invention, the formation of the insulating pattern layer of a positive or inverted negative image corresponding to image signal information on the heat conductive substrate can be performed by various methods. For example, in a preferred embodiment, an insulating pattern layer is formed on a heat-conductive substrate by activating a thermal head from the heat-conductive substrate side using an electric signal corresponding to image symbol information, and applying a heat-sensitive transfer film onto this substrate. This can be done by pressing and heating and transferring an insulating thermosensitive resin onto a heat conductive base material, or by a similar method from the base side of a heat conductive base material on which a conductive layer and an insulating thermosensitive resin layer have been formed. The transfer paper is pressed and heated on this base material, and the insulating thermosensitive resin is transferred from the heat conductive base material to the transfer paper, thereby creating a pattern that is inverted with the image symbol information (i.e., a reverse image pattern). can be made.

The insulating thermosensitive resin preferably comprises a resin having a specific resistance exceeding 1012 Ω·Cm, and preferably has a melting point or softening point within a range of about 50 to 250°C. Examples of such insulating resins include whale wax,
carnauba wax, candelilla wax, wood wax, beeswax,
Natural waxes such as montan wax and lanolin wax, paraffin wax, microcrystalline wax, ester wax, oxidized wax, low molecular weight polyethylene wax, synthetic waxes such as chlorinated paraffin, lauric acid,
Higher fatty acids such as myristic acid, palmitic acid, stearic acid, fromenic acid, behenic acid, higher alcohols such as stearyl alcohol and behenic alcohol, esters such as sucrose fatty acid ester, sorbitan fatty acid ester, stearamide, olein Amides such as amide, vinyl resins such as polyvinyl chloride, polyvinylidene chloride, polystyrene, polyvinyl acetate, vinyl chloride-polyvinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-methacrylic acid, ethylene- Copolymers such as vinyl acetate copolymer, styrene-butadiene-acrylonitrile copolymer, ethylene-α-olefin copolymer elastomer, saponified ethylene-vinyl acetate copolymer, cellulose resins such as ethyl cellulose and cellulose acetate, polyethylene ,polypropylene,
Thermoplastic resins such as acid-modified polyolefin, polyamide, polycarbonate, polysulfone, polyacetal, polymethyl methacrylate, polyphenylene oxide, polyurethane, polyethylene terephthalate, polybutadiene terephthalate, rubbers such as synthetic rubber, chlorinated rubber, natural rubber, etc., and epoxy Examples include polyurethane resins, acrylic resins, petroleum resins, phenolic resins, polyethylene waxes, montan waxes, partially saponified ester waxes, Huishatropsch waxes, and oil-based waxes.

In addition to the above-mentioned insulating resin alone, a coloring agent for visualizing the transferred pattern, a plasticizer, a stabilizer, other additives, and a filler can be mixed with the resin.

As the coloring agent, various inorganic or organic pigments, dyes, magnetic substances, metal powders, fluorescent pigments, and dyes can be used to the extent that the specific resistance of the insulating resin is not significantly reduced. In particular, if the heat conductive substrate is a transparent conductive film, the colored insulating transfer pattern can be seen from the back side, and this transfer pattern can be confirmed as a normal image pattern. For example, a filler made of an appropriate amount of insulating powder such as SiO2 powder or Al2O3 powder has the effect of improving the resolution of an image during thermal transfer.

When inverting and recording insulating image information, paper sheets such as high-quality paper, semi-quality paper, art paper, coated paper, imitation art paper, glassine paper, paperboard, polyester, polypropylene, acrylic, etc. can be used. A plastic film, a sheet of synthetic paper, or the like can be used alone or in combination, and the surface may also be treated to improve the receptivity of the heat-sensitive insulating resin.

In this embodiment, the transferred pattern can be confirmed as a normal image on the transfer paper side.

Embodiments of the method for producing a printing master plate according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows cross-sectional views at each step of the first embodiment of the method for producing a printing master plate 1. FIG. First, a heat-sensitive transfer film 4 in which a heat-sensitive insulating resin layer 3 is laminated on a resin film 2 and a heat-conductive base material 6 having a conductive layer 5 on its surface are prepared (first
Figure A). Next, a heat-sensitive insulating resin layer 3 is layered on the conductive layer 5,
A thermal head (not shown) is actuated from the heat conductive base material 6 by an electric signal corresponding to the image symbol information to press and heat the heat-sensitive transfer film 2 onto the conductive layer 5 (FIG. 1B). The insulating thermosensitive resin 3a is transferred onto the conductive layer 5 at the heated portion (ΔT), and the untransferred portion 3b of the insulating thermosensitive resin is peeled off together with the resin film 2 (FIG. 1C). In this way, the printing master plate 1 can be produced.

Further, as a second embodiment, FIG. 3 shows cross-sectional views at each step of an embodiment of the method for manufacturing the printing mask plate 1. As shown in FIG. First, a heat-conductive base material 5 having a heat-sensitive insulating resin layer 3 formed on a conductive layer 5 and a transfer paper 10 are prepared (FIG. 3A). Next, the heat-sensitive insulating resin layer 3 and the transfer paper 10 are overlapped, and a thermal head (not shown) is activated from the heat-conductive base material 6 by an electric signal corresponding to the image symbol information to deposit the transfer paper 1 on the heat-sensitive insulating resin layer.
Press and heat 0 (Fig. 3B). The insulating thermosensitive resin 3b is transferred onto the transfer paper 10 at the heated portion (ΔT), and the untransferred portion 3a of the insulating thermosensitive resin is peeled off from the transfer paper 10 together with the heat conductive substrate (FIG. 3C). In this way, the printing master plate 1 can be produced.

The illustrated embodiment is for a better understanding of the invention and is not intended to be limiting.

For example, a protective layer for imparting wear resistance can be provided on the surface of the insulating pattern layer corresponding to the image symbol information of the printing master plate.

Electrostatic Printing Method The electrostatic printing method according to the present invention includes the following steps 1 and 2.

(I) (B) A heat-conductive base material having a conductive layer on at least the surface layer and a heat-sensitive transfer film having a heat-sensitive insulating resin layer formed on the film, such that the conductive layer and the heat-sensitive insulating resin layer are in direct contact with each other. (b) A step of activating a thermal head from the base material side using an electric signal corresponding to the image symbol information to transfer the pressed and heated heat-sensitive insulating resin onto the conductive layer surface (c) From the base material side , Step of peeling off the heat-sensitive transfer film together with the untransferred portion of the heat-sensitive insulating resin to form an electrostatic printing master plate (d) Charging the electrostatic printing master plate to form an electrostatic latent image and charging it to the opposite polarity. Step of developing with toner and then transferring the toner image to a transfer medium (■) (a) A heat transfer base having conductivity on at least one surface and a heat-transferable heat-sensitive insulating resin formed on this conductive layer. Step of overlapping the material and the transfer paper so that the heat-sensitive insulating resin layer and the transfer paper are in direct contact (b) Activating the thermal head from the base material side with an electric signal corresponding to the image symbol information. , a step of transferring the pressed and heated heat-sensitive insulating resin onto the transfer paper (c) a step of peeling off the transfer portion of the heat-sensitive insulating resin and the transfer paper from the base material to form an electrostatic printing master plate (d) In the printing method of this invention, the process of charging an electrostatic printing master plate to form an electrostatic latent image (black and white reversed negative image), developing it with toner charged to the same polarity, and then transferring the toner to a transfer medium, After the toner image is transferred to the transfer medium, the toner image is fixed as necessary, and further,
The printing master plate surface may be cleaned. Each step of charging, toner development, transfer, and fixing in this method can utilize techniques used in ordinary electrophotography. A feature of this method is that the printing process does not require uniform exposure of the printing master plate surface, and may be performed under any optical conditions, such as in a dark room, under illumination, or with non-uniform exposure.

Next, one embodiment of the electrostatic printing method according to the present invention is shown in FIGS. 2 and 4.

Charge one side of the printing master plate with the corona charger 7 (second
Figure A and Figure 4A). Through this charging process, only the surface of the insulating pattern layer corresponding to the image symbol information is charged, and the surface of the conductive layer 5 is electrically conductive and is either not charged or charged with the opposite polarity. Next, one side of this printing master plate is covered with toner 8 of the opposite polarity (FIG. 2B) or with toner 8 of the same polarity (FIG. 4B), unattached toner is removed, and toner development is carried out (second step). Figure B and Figure 4B)
. A transfer medium 9 such as paper is placed on one surface of the printing master plate on which toner has been developed, and the back surface of the paper is charged with a corona charger 7 to transfer the toner (FIGS. 2C and 4C). A transfer medium 9 such as paper having transfer toner 8 corresponding to the image symbol information is fixed by heat, pressure, etc. (FIG. 2 and FIG. 4D).

Next, the printing master plate 1 after being transferred is returned to the band main process, and the series of processes is repeated depending on the number of sheets to be printed.

[For production]

In the present invention configured as described above, electrostatic printing is carried out as follows.

In the electrostatic printing method according to the present invention, a left-right inverted insulating pattern layer consisting of a positive or inverted negative image corresponding to image symbol information is formed on a heat conductive substrate having a conductive layer on at least the surface layer. A printing master plate created using the above method is used. Therefore, when this printing master plate is subjected to charging processing, the insulating pattern layer surface of the positive or inverted negative image corresponding to the image symbol information will be charged, but the conductive layer surface will be charged because it is electrically conductive. do not. Conventionally, an electrostatic latent image was obtained by charging and uniform exposure, but in the present invention, an electrostatic latent image is formed only by charging. The printing master plate surface on which this electrostatic latent image is formed is developed with toner charged with opposite polarity or the same polarity, and then the toner image is transferred to a transfer medium to perform electrostatic printing of a right-left image pattern. can.

〔Effect of the invention〕

The following effects can be obtained by this invention.

Judging from the above configuration and operation, and as demonstrated by the following examples, it is possible to easily and quickly obtain a large number of printed materials. In addition, since uniform exposure is not required in the electrostatic printing process and printing master plate production process, there is no need for expensive optical components such as light sources, focusing devices, lenses, and mirrors, and a compact and inexpensive printing device can be used. It can be printed using

When producing a printing master plate, the base material only needs to have at least a conductive surface, and there is no need for expensive raw materials such as photosensitive sheets, and it is possible to use versatile and inexpensive raw materials, making it inexpensive. A printing master plate can be created.

Furthermore, in the electrostatic printing method of the present invention, a thermal signal is applied from the opposite side of the conductive layer of the heat-conductive substrate, so a normal thermal printer that outputs a normal image pattern, such as a word processor, can be used as is, and the electrostatic printing method can be used as is. A reverse image can be formed on the printing master plate, and there is no need to equip the thermal printer with a device for forming a reverse image.

〔Example〕

This invention will be specifically explained by the following examples.

Example 1 A heat-sensitive insulating resin of ethylene-vinyl acetate copolymer was dissolved in toluene-isopropyl alcohol and coated on a 10 μm polyester film base material by a blade method to obtain a 2 g/d heat-sensitive transfer film. On the heat-sensitive insulating resin surface of this transfer film, a heat-conductive base material of 12 μm polyester film deposited with aluminum to a thickness of 1,000 mm was layered, and these were attached to a serial printer.
Press and heat with a thermal head from the back of the heat conductive base material,
An electrostatic printing master plate was prepared by forming an insulating pattern layer corresponding to image symbol information on the aluminum vapor-deposited surface of the heat-sensitive insulating resin of the transfer film. Using this master plate, perform charging, toner development, and toner transfer (plain paper).
An image corresponding to the image symbol information on the electrostatic printing master plate could be printed on plain paper.

This process was repeated to obtain 500 clear prints.

Example 2 Aluminum vapor deposition to a thickness of 500 mm was performed on a heat conductive substrate made of a polyester film with a thickness of 12 μm, and gravure reverse coating was performed on the vapor deposition surface while heating carnauba wax to 100°C to form a coating film with a thickness of 3 μm. I got it. The wax side of this base material and high-quality paper are overlapped, and the thermal head presses and heats the back of the heat-conductive base material to transfer the carnauba wax corresponding to the image symbol information onto the high-quality paper, exposing the vapor-deposited surface, and then An electronic printing master version was created. Using this electrostatic printing master plate, charging, toner development, and toner transfer were performed according to the reversal development method, and an image corresponding to the image symbol information could be printed on plain paper.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing each step of producing an electrostatic printing master plate according to the first aspect of the invention, and FIG. 2 is a sectional view showing each step of the electrostatic printing method according to the first aspect of the invention. , FIG. 3 is a sectional view showing each step of producing an electrostatic printing master plate according to the second embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view showing each step of the electrostatic printing method according to the embodiment. 1...Printing master plate, 2...Resin film, 3.
...Heat-sensitive insulating resin, 4...Heat-sensitive transfer film, 5...
・Conductive layer, 6... Heat conductive base material, 7... Charger, 8.
... Toner, 9 ... Transfer medium, 10 ... Transfer paper. Applicant's agent: -Yu Sato ↓ ΔT ΔT ΔT ΔT Figure 1 on 1 printed master version

Claims (1)

[Claims] 1. An electrostatic printing method characterized by including the following steps. (a) Layering a heat-conductive base material having a conductive layer on at least the surface layer and a heat-sensitive transfer film having a heat-sensitive insulating resin layer formed thereon so that the conductive layer and the heat-sensitive insulating resin layer are in direct contact with each other. Step (b) A step of activating a thermal head from the base material side using an electric signal corresponding to the image symbol information to transfer the pressed and heated heat-sensitive insulating resin onto the conductive layer surface (c) Transferring the heat-sensitive insulating resin from the base material side Step of peeling off the thermal transfer film along with the untransferred portion of the resin to form an electrostatic printing master plate (d) Charging the electrostatic printing master plate to form an electrostatic latent image, which is then developed with toner charged to the opposite polarity. Then, in step 2 of transferring the toner image to a transfer medium, a heat conductive base material having a conductive layer on at least the surface layer portion is
Claim 1 consisting of a heat conductive film and a conductive layer
Electrostatic printing method as described in section. 3. The electrostatic printing method according to claim 1 or 2, wherein the conductive layer is a metal vapor deposited layer. 4. A heat conductive base material having a conductive layer at least on the surface layer,
The electrostatic printing method according to claim 1, which is conductive treated paper. 5. An electrostatic printing method characterized by including the following steps (a) A heat conductive base material having a conductive layer on at least one surface and having a heat-transferable heat-sensitive insulating resin formed on the conductive layer. and the transfer paper so that the heat-sensitive insulating resin layer and the transfer paper are in direct contact with each other (b) driving the thermal head from the base material side with an electric signal corresponding to the image symbol information; , a step of transferring the pressed and heated heat-sensitive insulating resin onto the transfer paper (c) a step of peeling off the transfer paper together with the transfer portion of the heat-sensitive insulating resin from the base material to form an electrostatic printing master plate (d) Step 6 of charging the electrostatic printing master plate to form an electrostatic latent image, developing it with toner charged to the same polarity, and then transferring the toner to a transfer medium. The electrostatic printing method according to claim 5, comprising: and a heat-sensitive insulating resin layer. 7. The electrostatic printing method according to claim 5 or 6, wherein the conductive layer is a metal vapor deposited layer. 8. The electrostatic printing method according to claim 5, wherein the heat-conductive substrate is conductive treated paper on which a heat-sensitive insulating resin layer is formed. 9. An electrostatic printing master plate, characterized in that an insulating pattern layer of a positive or inverted negative image corresponding to image symbol information is formed on a heat conductive substrate having a conductive layer on at least the surface layer portion. 10. The master plate according to claim 9, wherein the insulating pattern layer is made of a resin having a specific resistance exceeding 10^1^2 Ω·cm. 11. The master plate according to claim 9, wherein the conductive layer is made of a material having a specific resistance of less than 10^1^0 Ω·cm. 12. The master plate according to any one of claims 8 to 10, wherein the heat conductive base material comprises a resin film and a conductive layer. 13. The conductive layer is a metal vapor deposition layer formed by vacuum deposition, sputtering, or ion plating, and the metal forming the conductive layer is gold, silver, copper, platinum, lead, zinc,
cadmium, nickel, cobalt, tin, indium,
Aluminum, magnesium, titanium, beryllium, lithium, gallium, selenium, tellurium, chromium, manganese, or antimony bismuth, or alloys thereof,
or an oxide alloy of these, the master plate according to any one of claims 8 to 11. 14. The master plate according to any one of claims 8 to 10, wherein the heat conductive base material is metal foil or conductive treated paper. 15. The master plate according to any one of claims 8 to 13, which has a heat-sensitive coloring layer on the opposite side of the conductive layer of the heat-conductive base material.