JPH08207327A - Thermal transfer recording apparatus of ink-sheet reproduction type - Google Patents

Abstract

PURPOSE: To adhere powdery ink stably to an ink-missing part by enclosing a core material of a low melting point of the powdery ink by an outer wall of a high melting point into the structure of a microcapsule. CONSTITUTION: A temperature detection sensor is set inside a heating roller 56. Owing to the temperature detection by the sensor, a heating roller 56 is maintained at a temperature necessary for melting the outer wall 66 of a powdery ink 43a. For example, the heating roller 56 is maintained at, 170 deg.C. The heating roller 56 transmits heat better and has a relatively smaller thermal capacity than a solid ink or the like, and therefore reaches the necessary temperature in a short time. When printing is started, first., a platen roller 48 is rotated by a driving means in the direction of an arrow A. At the same time, a recording paper 46 stored in a paper cassette 60 is fed by a paper feed roller 61 and sent, to an image-forming part by a paper transfer roller 62.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink sheet reproduction type thermal transfer recording device.

[0002]

2. Description of the Related Art Conventionally, thermal transfer recording type printers are widely used because they are small in size, low in cost, and capable of easily obtaining high quality images. An ink sheet is used as a recording material in the printer, and the ink sheet is a polymer resin substrate (ink film).
It is formed by coating the ink on the ink and is set in the printer while being housed in the cartridge.

When a thermal head is used to selectively heat the ink corresponding to the dots of an image, the ink of the portion corresponding to the image is transferred onto the recording paper. By the way, the ink in the portion of the ink sheet that does not correspond to the image remains on the base material without being transferred to the recording paper. When all the ink sheets are used and the cartridge or the ink sheet is discarded, the ink that remains coated on the base material is also discarded. Therefore, the running cost of the printer increases.

Therefore, there is provided a printer having an ink sheet reproducing apparatus so that the ink sheet can be regenerated and can be used repeatedly. FIG. 2 is a schematic diagram of a first conventional ink sheet recycling apparatus. In the figure, 11 is a heat insulating ink tank, and 12 is an ink roller rotated in the heat insulating ink tank 11. A heater 13 is embedded in the ink roller 12, and a spiral V-shaped groove is formed on the surface. Further, 14 is a reverse roller which is arranged in contact with the ink roller 12 and is rotated in the opposite direction to the ink roller 12.

A thermoplastic ink 15 is contained in the heat insulating ink tank 11. The ink 15 is solid at room temperature and is heated and melted by the heater 13. Further, 17 is a base material of the ink sheet, 1
Reference numeral 8 denotes a backup plate which is arranged to face the reverse roller 14 with the base material 17 interposed therebetween. In the ink sheet reproducing apparatus having the above structure, the ink roller 12
When the ink is rotated, the melted ink 15 is drawn from the heat-insulating ink tank 11, and the ink pool () is generated near the contact point between the ink roller 12 and the reverse roller 14.
A wall 19 is formed. At this time, the reverse roller 1
A fixed amount of ink 15 is supplied to the surface P of the ink container 4 opposite to the ink reservoir 19 through the V-shaped groove. Then, when the backup plate 18 is lowered and the base material 17 on which ink partially remains remains in contact with the reverse roller 14, the ink 15 on the surface of the reverse roller 14 is transferred to the base material 1.
7 to form an ink layer.

Here, the reverse roller 14 is the base material 1.
7 is rotated in the direction opposite to the traveling direction. Therefore,
The ink 15 remaining on the base material 17 is applied to the reverse roller 14 as the reverse roller 14 rotates,
The ink 15 is melted by receiving the heat of the ink 15 supplied via 4 and is collected in the ink reservoir 19 (I. Nose,
etc. : A Color Thermal Tran
sfer Printer with Record
ng Mechanism, SID-85 Diges
t, 1985).

FIG. 3 is a schematic view of a second conventional ink sheet recycling apparatus. In the figure, reference numeral 31 is an ink sheet on which image formation has been completed by a thermal head or the like, and an ink layer 33 is formed on the surface of a base material 32. The ink sheet 31 is moved by sliding on a brush formed of a conductive and magnetic powder ink 34. The powder ink 34 is held and conveyed by a conductive sleeve 35 containing magnets magnetized in multiple poles.

A back electrode 36 is provided so as to contact the back side of the ink sheet 31, and a bias voltage is applied between the back electrode 36 and the conductive sleeve 35. Then, the charge moves in the tip direction along the brush of the powder ink 34, and is injected into the powder ink 34 or the ink layer 33 which is in contact with the transfer portion of the ink layer 33. Here, the amount of injected charges is proportional to the product of the bias voltage and the capacitance of the base material 32, and the injected charges cause electrostatic force between the powder ink 34 and the ink sheet 31. Is generated.

However, since the portion of the ink layer 33 where the ink remains (hereinafter referred to as the "ink remaining portion") and the powder ink 34 are conductive, they merely serve as a path for electric charges and an electrostatic force is generated. No, powder ink 34
Is held on the conductive sleeve 35 by a magnetic restraining force. Therefore, the powder ink 34 can be adhered and replenished only to a portion of the ink layer 33 where the ink is missing (hereinafter referred to as “ink missing portion”), and the ink layer 33 consisting of almost one layer can be formed.

Numeral 37 is a magnet roller arranged in the conductive sleeve 35, numeral 38 is a power source, and numeral 39 is a fuser for melting the replenished powder ink 34. New recycling method for ink sheets for use "JH90, Electrophotographic Society, 1990). However, in the first ink sheet reproducing apparatus, it is necessary to melt the solid ink 15 having a large heat capacity when starting printing by the printer, and it takes a long time to start up after the power of the printer is turned on. Not only that, even after the printing is completed and the power is turned off, the ink 15 remains in the molten state for a while.

Therefore, when the printer is moved, the ink 15 is spilled from the heat insulating ink tank 11. On the other hand, in the second ink sheet reproducing apparatus, an electric charge is induced in the powder ink 34 by electrostatic induction, and the substrate 3
Since the powder ink 34 is attached to the second layer 2, it is necessary to make the powder ink 34 conductive. Therefore, the conductive particles are mixed with the powder ink 34, but when the conductive particles are mixed, the color saturation becomes low when color printing is performed.

Therefore, an ink sheet reproducing apparatus is conceivable in which it takes no time for the printer to start up and the color saturation does not decrease when color printing is performed. In this case, first, the used ink sheet is superposed on the photosensitive roller whose surface is uniformly and uniformly charged, and the photosensitive roller is exposed from above the ink sheet so as to correspond to the ink missing portion. The charge on the surface of the photosensitive roller is removed. As a result, a charge pattern corresponding to the ink missing portion is formed on the photosensitive roller.

Next, the powder ink charged in advance to the opposite polarity by friction is attached to the base material so as to correspond to the charge pattern. Therefore, the powder ink is attached to the ink missing portion. Then, the powder ink on the base material is melted to form a uniform ink layer. According to this method, since the powder ink is used, it takes no time to start up the printer. Further, since the powder ink precharged by friction is used without using electrostatic induction to attach the powder ink to the substrate, the conductive particles are premixed with the powder ink. There is no need to keep it. Therefore, the color saturation does not decrease when color printing is performed.

[0014]

However, in the above-mentioned conventional ink sheet reproducing apparatus, when the wax-based ink used in the printer of the thermal transfer recording system is powdered and used as the powder ink, the temperature or humidity is increased. The blocking property decreases as the temperature rises, and the powder ink solidifies in the container. Therefore, the powder ink cannot be attached to the ink missing portion in the powder ink applying step, and the ink sheet cannot be regenerated.

This is because the wax-based ink uses a binder of waxes having a low softening temperature, and the powder inks adhere to each other or agglomerate in the powder ink. In addition, when a toner made of a thermoplastic resin used in a normal electrophotographic recording device is used as the powder ink, the blocking property is improved, and the powder ink is stably attached to the ink missing portion in the powder ink application process. However, in the image forming process, the thermal head used in a normal thermal transfer recording device cannot sufficiently melt the ink of the ink sheet, which causes a transfer failure and lowers the recording density. Fixation becomes insufficient.

According to the present invention, the problems of the conventional ink sheet reproducing apparatus can be solved, and the powder ink can be stably attached to the ink missing portion in the powder ink applying step. The recording density becomes low,
An object of the present invention is to provide an ink sheet reproduction type thermal transfer recording device in which fixing is not insufficient.

[0017]

Therefore, in the ink sheet reproduction type thermal transfer recording apparatus of the present invention, an image forming means for selectively heating the ink of the ink sheet and transferring it to the recording paper to form an image. Through a rotatably arranged photosensitive roller, charging means for uniformly and evenly charging the surface of the photosensitive roller, and an ink sheet on which an ink missing portion and an ink residual portion after transfer are formed, Light-irradiating means for irradiating the photosensitive roller with light to form a charge pattern corresponding to an ink-missing portion, and powder ink previously charged by friction in correspondence with the charge pattern of the photosensitive roller is ink-charged by electrostatic force. It has an ink adhering means for adhering to the missing portion and a heating means for heating and melting the powder ink adhering to the ink missing portion.

Further, the powder ink has a microcapsule structure in which a core material made of a material having a low melting point is surrounded by an outer wall made of a material having a high melting point.

[0019]

According to the present invention, as described above, in the ink sheet reproduction type thermal transfer recording apparatus, the image forming means for selectively heating the ink of the ink sheet to transfer it to the recording paper and forming the image, and the rotation. The photosensitive roller is freely arranged, charging means for uniformly and uniformly charging the surface of the photosensitive roller, and an ink sheet on which an ink missing portion and an ink residual portion after transfer are formed. Light irradiating means for irradiating the roller with light to form a charge pattern corresponding to the ink missing portion, and powder ink charged in advance by friction corresponding to the charge pattern of the photosensitive roller by electrostatic force to the ink missing portion. And an heating means for heating and melting the powder ink attached to the ink missing portion.

Further, the powder ink has a microcapsule structure in which a core material made of a material having a low melting point is surrounded by an outer wall made of a material having a high melting point. Therefore, in the image forming process, when the ink of the ink sheet is selectively heated and transferred to the recording paper, an ink missing portion and an ink residual portion are formed on the ink sheet. Further, in the charging step set almost simultaneously with the image forming step, the surface of the photosensitive roller is uniformly and evenly charged by the charging means.

Next, in the light irradiation step, the light of the light irradiation means is uniformly irradiated onto the photosensitive roller via the ink sheet to perform exposure. And, in the ink residual portion,
The light is absorbed by the ink, and at the ink missing portion, the light passes through the ink sheet and removes the charge on the photosensitive roller. Therefore, a charge pattern corresponding to the ink missing portion is formed on the photosensitive roller.

Then, in the powder ink applying step,
The powder ink charged in advance by friction is attached to the ink missing portion by electrostatic force to replenish the ink. In this case, since the outer wall is made of a material having a high melting point, the blocking property is improved and the powder ink does not solidify in the container.

As a result, the powder ink can be stably attached to the ink missing portion. Then, in the heating and melting step, when the ink sheet passes through the heating means, the powder ink is heated through the base material, the outer wall is broken, and the core material appears outside. In this case, since the melting point of the core material is lower than that of the outer wall, the core material is sufficiently melted at the temperature in the heating and melting step and the viscosity becomes low. Then, the melted core material is mixed with ink so that the boundary is eliminated to form an ink layer having a uniform thickness. In this way, the ink sheet is reproduced, conveyed to the recording unit, and used again.

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic view of an ink sheet reproduction type thermal transfer recording apparatus in an embodiment of the present invention, FIG. 4 is an image forming process diagram of the ink sheet reproduction type thermal transfer recording apparatus in an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention. FIG. 6 is a charging process diagram of the ink sheet reproduction type thermal transfer recording device in FIG. 6, FIG. 6 is a light irradiation process diagram of the ink sheet reproduction type thermal transfer recording device in the embodiment of the present invention, and FIG. 7 is an ink sheet reproduction type thermal transfer recording in the embodiment of the present invention. FIG. 8 is a powder ink application process diagram of the apparatus, FIG. 8 is a heating and melting process diagram of the ink sheet reproduction type thermal transfer recording device in the embodiment of the present invention, and FIG. 9 is a conceptual diagram of the powder ink in the embodiment of the present invention.

In the figure, 41 is an ink sheet,
The ink sheet 41 includes a base material 42 made of a blue polymer film and an ink 43 applied on the base material 42. If necessary, a slipping layer may be formed on the back surface of the base material 41 on the surface that comes into contact with the thermal head 45 as the image forming means. As the base material 42, polyester, polyimide, polyetherimide,
Films of polyether sulfone, polyether ether ketone, etc. can be used. In that case, the thickness of the film is 1 [μm] or more from the viewpoint of strength and handleability, and 10 from the viewpoint of heat transferability in the image forming process.
[Μm] or less is preferable.

Reference numeral 46 is a recording paper, and the thermal head 45 sandwiches the ink sheet 41 and the recording paper 46.
And a platen roller 48 are provided, and a constant pressure is applied between them. A photosensitive roller 49 is formed by applying an organic photosensitive layer 49b on the surface of a conductive base material 49a such as aluminum. Reference numeral 53 denotes a charging roller as a charging means arranged so as to face the photosensitive roller 49, which is formed by laminating a conductive rubber on a metal cored bar. As the charging means, a corona discharger can be used in addition to the charging roller 53 as shown in the figure.

A light source 51 as a light irradiating means is disposed at a position where the photosensitive roller 49 and the ink sheet 41 are overlapped with each other in contact with each other. The light source 51 emits light to the photosensitive roller 49 via the ink sheet 41. Irradiate and expose uniformly. In this case, the light source 51 generates visible light as light. Reference numeral 52 denotes a powder ink carrying roller as an ink adhering means, which is arranged in contact with or in proximity to the base material 42 closely attached to the photosensitive roller 49. The powder ink transport roller 52 is provided with the powder ink 43 contained in the container 57.
A is previously charged by friction, adhered to the surface by an electrostatic force, and made uniform in thickness by a thickness uniformizing means 54 such as a blade, and conveyed to the ink sheet 41.

A heating roller 56 as a heating means is formed by incorporating a halogen lamp (not shown) in a hollow member made of metal. In addition to this, as a heating means, a heating resistance layer made of Ni-P or the like is formed on the surface of a substrate such as glass or ceramic, and a protective layer such as Ta ₂ O ₅ or fluororesin is further formed on the heating resistance layer. You can also use the body. In addition, a pressure roller (not shown) is provided so as to face the heating roller 56, and the ink sheet 4
It is also possible to sandwich 1. In that case, the heat of the heating roller 56 can be efficiently transferred to the powder ink 43a.

Reference numeral 60 is a paper cassette for containing the recording paper 46, 61 is a paper feed roller, and 62 is a paper feed roller. By the way, as shown in FIG. 9, the powder ink 43a is
A core material 65 and an outer wall 66 surrounding the core material 65,
It has a microcapsule structure. The core material 65 is formed of a material having a low melting point that satisfies the characteristics required in the image forming process, and the outer wall 66 is formed of a material having a high melting point that satisfies the characteristics required in the powder ink coating step.

That is, in order to prevent the powder inks 43a from adhering to each other or agglomeration occurring inside the powder ink 43a as the temperature or humidity rises, the outer wall 66 is made of vinyl having a high melting point and a high glass transition point. Polymers such as styrene, acrylic acid ester, and methacrylic acid ester were used. In this way, the blocking property is improved so that the powder ink 43a does not solidify in the container 57. An external additive such as silica may be mixed in the outer wall 66 in order to further improve the charging performance required in the powder ink application step.

On the other hand, the core material 65 is used so that the ink 43 of the ink sheet 41 can be sufficiently melted by the thermal head 45 used in a normal thermal transfer recording apparatus.
As the material, carnauba wax having a low melting point, a waxy binder such as microcrystalline wax, low molecular weight polyethylene and the like were used. In this way, the transfer can be favorably performed in the image forming process, so that the recording density does not become low and the fixing does not become insufficient. A coloring material such as a pigment or a dye can be mixed in the core material 65 if necessary.

As a method for forming microcapsules, a spray drying method, an interfacial polymerization method, a coacervation method and the like are known, and in the present embodiment, the microcapsules were formed by a powder mist drying method. Next, the operation of the ink sheet reproduction type thermal transfer recording apparatus having the above structure will be described.

When a power source (not shown) of the ink sheet reproduction type thermal transfer recording apparatus is turned on, the halogen lamp of the heating roller 56 is energized. A temperature detection sensor (not shown) is disposed inside the heating roller 56, and the heating roller 56 is heated to a temperature required to melt the outer wall 66 of the powder ink 43a by the temperature detected by the temperature detection sensor.
Is maintained. In this embodiment, the heating roller 56 is maintained at a temperature of 170 [° C].

The heating roller 56 is a solid ink 1.
5 (see Fig. 2) etc. has good heat transfer,
Due to the relatively small heat capacity, the required temperature is reached in a short time. Then, when printing is started, first, the platen roller 48 is rotated in the direction of arrow A by a driving unit (not shown). Further, the recording paper 46 accommodated in the paper cassette 60 is fed by the paper feed roller 61 and fed by the paper feed roller 62 to the image forming unit.

When the image signal is transferred to the thermal head 45 in the image forming process, the thermal head 4
A voltage is applied to each of the heat generating portions of No. 5 in correspondence with the image signal, and a current is supplied to each heat generating portion to generate heat. At this time,
In the recording portion formed between the thermal head 45 and the ink sheet 41, the outer wall 66 of the powder ink 43a has already been broken and the core material 65 is thinly fixed on the base material 42. Therefore, the ink sheet 4 in contact with the heat generating portion
The first ink 43 is heated and melted via the base material 42, and is transferred to the recording paper 46. In this case, the core material 65
Since it is made of a material having a low melting point, the ink of the ink sheet 41 can be sufficiently melted by the thermal head 45 used in a general thermal transfer recording apparatus.

Here, as shown in FIG. 4, the ink sheet 41
In the figure, the ink corresponding to the image portion and transferred to the recording paper 46 is indicated by 43b, and the ink corresponding to the non-image portion is indicated by 43c. After the image formation is completed, the ink sheet 41 has an ink residual portion and an ink missing portion. On the other hand, in the charging process set almost simultaneously with the image forming process,
As shown in FIG. 5, the photosensitive roller 49 is rotated as the ink sheet 41 travels, and the surface of the photosensitive roller 49 is uniformly and evenly charged by the charging roller 53. Therefore, the conductive base material 49a of the photosensitive roller 49 is
A voltage is applied between and the core of the charging roller 53.
By controlling this voltage, the charging potential of the surface of the photosensitive roller 49 is controlled.

Next, as shown in FIG. 6, in the light irradiation step, the light from the light source 51 is uniformly irradiated onto the photosensitive roller 49 via the ink sheet 41 to perform exposure. Then, the light is absorbed by the ink 43 at the ink residual portion, and the light passes through the ink sheet 41 at the ink missing portion to remove the electric charge of the photosensitive roller 49. Therefore,
A charge pattern corresponding to the ink missing portion is formed on the photosensitive roller 49.

Then, in the powder ink applying step,
An ink application bias voltage is formed between the conductive base material 49 a of the photosensitive roller 49 and the powder ink carrying roller 52. At this time, the powder ink transport roller 52 and the base material 42
An electric field corresponding to the charge pattern is formed between and, and lines of electric force are generated through the insulating base material 42.

As a result, as shown in FIG. 7, the powder ink 43a charged on the surface of the powder ink transport roller 52 is attached to the ink missing portion by the electrostatic force to replenish the ink 43. In this case, the amount of the powder ink 43a, that is, the thickness of the ink 43 can be controlled by controlling the ink application bias voltage. Then, when the powder ink application process is completed, the ink 43c and the powder ink 43 are formed on the surface of the base material 42.
A layer in which a is mixed is formed.

As described above, a material having a high glass transition point is used for the outer wall 66 so that the powder inks 43a do not adhere to each other or aggregate in the powder ink 43a. Therefore, the blocking property is improved, and the powder ink 43a does not solidify in the container 57. As a result, the powder ink 43a can be stably attached to the ink missing portion.

Subsequently, as shown in FIG. 8, in the heating and melting step, when the ink sheet 41 passes through the heating roller 56, the powder ink 43a is heated through the base material 42 and the outer wall 66 is broken. Then, the core material 65 appears outside. As described above, since the melting point of the core material 65 is lower than that of the outer wall 66, the core material 65 is sufficiently melted at the temperature in the heating and melting step, and the viscosity becomes low. Then, the melted core material 65 of the powder ink 43a is mixed with the ink 43c so that there is no boundary, and the ink 4 having a uniform thickness is formed.
3 layers are formed. In this way, the ink sheet 41
Is reproduced, conveyed to the recording unit and used again.

After the heating and melting step is completed and before the image forming step is started, the ink 4 on the substrate 42 is
3 is cooled and solidifies. In this embodiment, one of yellow ink, magenta ink, and cyan ink
Although a single color ink sheet reproduction type thermal transfer recording apparatus using only colors has been described, the present invention can also be applied to an ink sheet reproduction type thermal transfer recording apparatus using all of yellow ink, magenta ink and cyan ink.

In this embodiment, the ink sheet reproduction type thermal transfer recording apparatus of the heat melting method has been described, but the present invention can also be applied to the ink sheet reproduction type thermal transfer recording apparatus of the electric transfer method. Also, the ink sheet 4
Although 1 has been described as an endless one, the ink sheet can also be conveyed by a paper feed roll and a take-up roll.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and these are not excluded from the scope of the present invention.

[0045]

As described above in detail, according to the present invention, in the ink sheet reproduction type thermal transfer recording apparatus,
An image forming unit that selectively heats the ink of an ink sheet and transfers it to recording paper to form an image, a photosensitive roller rotatably disposed, and the surface of the photosensitive roller is uniformly and evenly charged. Charging means for irradiating, and light irradiating means for irradiating the photosensitive roller with light through the ink sheet on which the ink missing portion and the ink residual portion after transfer are formed, and forming a charge pattern corresponding to the ink missing portion, Corresponding to the charge pattern of the photosensitive roller, an ink adhering means for adhering the powder ink charged by friction in advance to the ink missing portion by electrostatic force and the powder ink adhered to the ink missing portion are heated. And a heating means for melting.

Further, the powder ink has a microcapsule structure in which a core material made of a material having a low melting point is surrounded by an outer wall made of a material having a high melting point. Therefore, since the outer wall is made of a material having a high melting point, the blocking property is improved and the powder ink is not solidified in the container. As a result, the powder ink can be stably attached to the ink missing portion in the powder ink applying step.

Further, since the core material has a lower melting point than the outer wall, the core material is sufficiently melted at the temperature in the heating and melting step, and the viscosity becomes low. Therefore, in the image forming step, the ink of the ink sheet can be sufficiently melted by the thermal head used in a normal thermal transfer recording device. Therefore, the recording density does not become low and the fixing does not become insufficient.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an ink sheet reproduction type thermal transfer recording apparatus in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a first conventional ink sheet recycling apparatus.

FIG. 3 is a schematic view of a second conventional ink sheet recycling device.

FIG. 4 is an image forming process diagram of an ink sheet reproduction type thermal transfer recording device in an example of the present invention.

FIG. 5 is a charging process diagram of an ink sheet reproduction type thermal transfer recording device in an example of the present invention.

FIG. 6 is a light irradiation process chart of the ink sheet reproduction type thermal transfer recording apparatus in the embodiment of the present invention.

FIG. 7 is a diagram showing a powder ink coating process of the ink sheet reproduction type thermal transfer recording apparatus in the embodiment of the present invention.

FIG. 8 is a heating / melting process diagram of the ink sheet reproduction type thermal transfer recording apparatus in the example of the present invention.

FIG. 9 is a conceptual diagram of powder ink in an example of the present invention.

[Explanation of symbols]

 41 Ink Sheet 43 Ink 43a Powder Ink 45 Thermal Head 46 Recording Paper 49 Photosensitive Roller 51 Light Source 52 Powder Ink Conveying Roller 53 Charging Roller 56 Heating Roller 65 Core Material 66 Outer Wall

Claims (2)

[Claims] 1. An image forming unit for forming an image by selectively heating (a) ink of an ink sheet and transferring the ink onto a recording sheet, (b) a rotatably arranged photosensitive roller, and (c) )
The photosensitive roller is irradiated with light through a charging unit that uniformly and uniformly charges the surface of the photosensitive roller, and (d) an ink sheet on which an ink missing portion and an ink residual portion after transfer are formed, Light irradiation means for forming a charge pattern corresponding to the ink missing portion, and (e) ink for adhering to the ink missing portion by electrostatic force the powder ink charged in advance by friction corresponding to the charge pattern of the photosensitive roller. While having an adhering means and (f) a heating means for heating and melting the powder ink adhered to the ink-missing portion, (g) the powder ink includes a core material made of a material having a low melting point. An ink sheet reproduction type thermal transfer recording device comprising a microcapsule structure surrounded by an outer wall made of a material having a high melting point. 2. The ink sheet reproduction type thermal transfer recording apparatus according to claim 1, wherein the core material is made of a wax binder and the outer wall is made of a vinyl polymer.