JPS62170354A - Printer - Google Patents

Abstract

PURPOSE:To enable dots with a normal shape to be recorded on a transfer recording medium having a poor surface smoothness and prevent smearing of characters from occurring, by opposing a transfer recording medium to a film coated with a thermoplastic magnetic ink, with a space therebetween, providing a magnetic attracting force generating means on the back side of the medium, and causing droplets of an ink to fly onto the medium in accordance with the pitch of a plurality of heat generating elements. CONSTITUTION:A heat-applying means 11 comprising a plurality of heat generating elements is disposed on the back side of a film coated with a thermoplastic magnetic ink, while a transfer recording medium 14 is opposed to the film with a space therebetween, a magnetic attracting force generating means 15 is provided on the back side of the medium 14, and an ink is caused to fly onto the medium 14 in accordance with the pitch of the heat generating elements. Accordingly, the magnetic ink is transferred according to the pitch of the heat generating elements, and clear printing can be performed. In addition, since the ink and the medium 14 do not make contact with each other at a non-recording part 12 of the ink, record dots with a normal shape can be formed with favorable transfer efficiency even on a transfer recording medium having a poor surface smoothness or even in the case of forming small-area record dots with a high density, and smearing of characters will not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-impact printing device, and more specifically, the present invention relates to a non-impact printing device, and more specifically, it is capable of transferring thermoplastic magnetic ink to a transfer medium by the action of heat and magnetism, and is capable of printing characters, letters, etc. It relates to a printing device that obtains images.

[Conventional technology]

Many methods using magnetic ink have been proposed as small, low-cost, non-impact printing methods.

For example, a method disclosed in Japanese Patent Application Laid-Open No. 52-96541 uses magnetic ink as the ink of the fused thermal transfer method, and a magnetic means provided separately from the heat supply means applies a magnetic attraction force to the ink corresponding to the thermal image. It is used for copying. That is, as shown in FIG. 30, the thermal head 301-
The ink medium 302 - transfer paper 305 - high stone 306 are installed in this order, and the thermoplastic magnetic ink 304 + t of the ink medium is
When heat is applied from the base film 303 surface by the T-maru head (directly below the head), the ink medium is brought into contact with the transfer paper and the molten ink is adhered to the transfer target, and then the ink medium is peeled off from the transfer paper and the ink medium is removed from the transfer paper. It can be transcribed. In addition, magnetic attraction increases the probability of molten ink contacting the transfer paper, and increases the rate of transfer to the paper when the ink medium is peeled off. It was devised so that nine images of characters could be printed with high quality.

[Problem to be solved by invention ÷ miracle →] However, in the above-mentioned conventional technology, when peeling off the ink medium,
The ink in the recording area to be transferred is in contact with the base film and the ink in the non-recording area, so it melts once and
A force acts to peel off the ink in the recording section that is adhered to the transfer paper together with the base film, which causes transfer defects. In FIG. 31, in general thermal transfer recording, FA (inter-transfer paper adhesion force) and F
Between B (ink cohesive force), force that prevents transfer, FCC interbase film adhesion force) and FD (recorded area inter-non-recorded area ink cohesive force), FB, FA>>F
If the relationships C and FD always hold true, the transfer will be complete.

In the figure, 41 is the base film, 42 is the recording part ink,
43 is non-recording ink, and 44 is transfer paper.

Furthermore, in the above-mentioned conventional technology, when the ink melts, the ink in the recording section is attracted toward the transfer paper by the magnetic attraction force, so the probability of contact with the transfer paper increases.
As shown in the figure, increasing FA had the effect of increasing the transcription efficiency to some extent. However, when the ink medium is peeled off, the base film, ink, and transfer paper still adhere to each other.
exists. Therefore, especially when transferring to paper with very poor surface smoothness, FA<FC or FA<F
Case D occurs, resulting in a problem of poor transfer.

Also, if printed using the conventional method, as shown in Figure 32,
If the surface condition of the transfer medium is rough, the recording tod 32
1, the transfer medium 322 and the magnetic ink layer 32
Since there was a portion (trough portion 324 in the figure) that did not make contact with the dot 3, a recording dot with a normal shape could not be obtained. especially,
The transfer medium shown in Figure 33 has a very poor surface smoothness (
Beck smoothness 1 to 2 seconds) For paper such as rough paper,
Even if magnetic attraction is used as in the prior art described above, the magnetic ink adheres only to the vicinity of convex portions 331 such as the tips of fibers on the surface, resulting in the stain-like recording dots 332 shown in FIG. 33, which are not normal. No shape recording dots were obtained.

Further, the same phenomenon is particularly noticeable when the density of recording dots increases, and recording dots with a small area cannot obtain a normal shape.

Furthermore, in the conventional method, as shown in FIG. 30, since the rotating magnetic ink 34 and the transfer paper 305 are in contact with each other, most of the heat generated in the thermal head 301 passes through the rotating magnetic ink 304 and is transferred. It had escaped to transfer paper 305. For this reason, there is a problem in that during transfer, a large amount of heat is lost as heat loss without thermally melting the magnetic ink 304. (This phenomenon will be referred to as heat loss hereinafter.) Furthermore, in the conventional method, as shown in FIG. 30, the magnetic ink 304
Since the visible ink 304 and the transfer paper 305 are in contact with each other, friction, heat conduction, etc. occur between the visible ink 304 and the transfer paper 305. For this reason, there is a problem in that the magnetic ink 304 is recorded on the non-recorded portion of the transfer paper by a method other than the normal recording means using the thermal head (hereinafter referred to as "inner stain").

Therefore, the present invention aims to solve these problems.
The purpose is to provide a device that can satisfy at least one of the following four items.

1. Normally shaped dots can be recorded on transfer paper with very poor surface smoothness or on films that do not have very high affinity with ink.

2. Prevents smudging of letters.

3. Reduce heat loss during printing energy.

4. Normally shaped dots can be printed even if the density of recording dots is increased.

[Means for solving problems]

The printing device of the present invention includes a heat applying means provided with a plurality of heating elements on the back of a film coated with a thermorecessed magnetic ink, and a transfer medium and a transfer medium facing the film with a space therebetween. A magnetic attraction force generating means is provided behind it, and the ink is ejected onto the transfer medium in accordance with the pitch of the plurality of heating elements.

[Effect]

According to the above configuration, the magnetic ink is transferred according to the pitch of the heating elements, and clear printing can be performed.

Note that a general thermal head is available as a means for applying thermal energy to the printing device.

In addition, it is preferable to provide the thermoplastic magnetic ink in a uniform layer on the surface of the base film of the heat-resistant resin.

Means for generating magnetic attraction include electromagnets, permanent magnets, and the like.

Further, as a method of applying energy, the energy applied for each transfer of one recording dot or the like may be time-divided into two or more times and applied to the ink.

Further, a thermal bias may be applied to the transfer medium and/or the transfer medium before and/or after printing, or both before and after printing.

Alternatively, the recording tod on the transfer medium may be hot-rolled after applying thermal energy using a heat roller.

In addition, for ink media that can be used in the above-mentioned printing devices, etc., it is recommended to provide unevenness on the surface of the magnetic ink layer.The average pitch of the unevenness is determined by the electrode of the thermal head when using a thermal head as a means for applying thermal energy. (for example, when the pitch of the electrodes of the thermal head is 8 lines/mm, the unevenness pitch is within about 150 μm).

Further, an overfoot layer may be provided on the thermoplastic magnetic ink layer, or an undercoat layer may be provided between the support layer and the thermoplastic magnetic ink layer.

In addition, the means for generating magnetic attraction force is to create a magnetic closed circuit using magnetic materials, and use leakage magnetic flux (or magnetic field, magnetism) to generate
It is also possible to use a magnetic attraction force that absorbs the thermoplastic magnetic ink. In this case, it is preferable to obtain leakage magnetism by providing a discontinuous part of the magnetic material in the form of a magnetic closed circuit. A strong magnetic attraction force can be obtained by making a part of the magnetic material (closed circuit shape) that makes up the closed circuit discontinuous and using the leakage magnetism of that part. A stronger magnetic attraction force can be obtained by utilizing the leakage magnetic flux at the edge.

For example, as shown in FIG. 1, the printing apparatus of the present invention includes a means 11 for applying thermal energy to a recording portion 13 of thermovisible magnetic ink, and a means 5 for generating a magnetic attraction force to the ink.
This is a printing method in which the recorded portion of the ink is transferred to the transfer medium 14 by magnetic attraction force by controlling the application of thermal energy, and the ink and the transfer medium are connected to the non-recorded portion 12 of the ink ( FM is magnetic attraction baitle)
There is no contact between the two.

According to the above configuration, the thermorecessable magnetic ink and the transfer medium are not in contact with each other in the non-recording portion of the ink, and therefore, the ink is transferred at least in the transfer portion by melting the ink by thermal energy. When the ink is activated by heat, the magnetic attraction force causes the ink recording portion to deform or fly. That is, the printing on the transfer medium is completed almost simultaneously with the application of thermal energy to the ink, and the process of peeling off the ink medium of the prior art is unnecessary. That is, in FIG. 31, FC% FD at the time of peeling off the ink medium that was preventing transfer.
is absent, so transcription is complete.

In addition, the ink recording area deforms or flies regardless of the shape of the transfer medium, and the ink transfer is performed without contact between the ink medium and the transfer medium, so the surface smoothness is not as smooth as that of rough paper. The transfer efficiency is good even on a transfer medium with poor surface area, or even on high-density recording dots with a particularly small area, and recording dots with a normal shape can be produced.

Furthermore, since the ink medium and the transfer medium are not in contact with each other, there is no contact between the ink non-recorded area and the transfer medium, and no smudging of characters occurs.

Furthermore, since the ink medium and the transfer medium are not in contact with each other, there is no heat loss due to heat conduction from the ink medium to the transfer medium.

Example of using an electromagnet as the magnetic attraction means [Example 1]
] Diagrams of the printing method in this example are shown in Figure 2 (a) and (C).
), 21 is a thermal head, 22 is an ink medium,
23 is a transfer paper, 24 is a t-magnet head or a permanent magnet head, 25 is an indicator layer of an ink medium, and 26 is a magnetic ink. In the present invention, as shown in FIG. can be installed without contact. Furthermore, as shown in FIG. 2(b), it is desirable that the longitudinal direction of the suction section of the electromagnet head or permanent magnet head be longer than the length of the thermal element row of the thermal head, that is, the length of the printing section. This is to apply magnetic attraction force uniformly to the recording area of the magnetic ink.

2(b)-1 to (b)-4 show the recording mechanism, 25 is a support layer, 26 is magnetic ink, 23 is a transfer paper, 24 is an electromagnetic head, and 21 is a thermal head.

The shaded area of the magnetic ink is the area heated by the thermal head in accordance with the image signal. (b)-1 shows the heat application process, (b)-2 shows the suction deformation process, (b)-3 shows the flying process, and (b)-4 shows the transfer completion process. According to observation, (b)-1→(b)
-2-(b)-4 and (b)-1→(b)-3→(b)
There were two possible processes (-4), but both were excellent in terms of printing quality. That is, there were no transfer defects as seen in conventional contact type printing (FIG. 30), and the shape of the printed dots was circular or oval, with excellent reproducibility. This is largely due to the fact that the magnetic ink and the transfer paper in the present invention are not in contact with each other.

Figure 2 (
Shown in d), (e), (f'), and (g).

The core (29) has a tapered tip (29°). The material of the core is a high permeability material, namely Fa, F
@-Si, Fe-Ni, Mu-Zu7 elite, N
1-Zu ferrite etc. are suitable. In addition, at the tip of the core,
The use of a high saturation magnetic flux density material such as Fa-Co is even more effective.

Figure 3(a) shows the magnetic field distribution at the tip of the electromagnet head, and Figure 3(b) shows the strong attenuation curve of the magnetic field in the X direction in Figure 3(a). -1, 2, 3) and Hi (+-1, 2, 3) correspond to each other. Reference numeral 31 in FIG. 3(a) indicates magnetic ink in the recording section, which is attracted toward the head 32 by magnetic attraction force (F2).

The magnetic attraction force F is expressed as F=Mo2H/2X. Here, M is the magnetization strength t of the ink, 2H/2X
indicates the magnetic field gradient in the X direction. Therefore, as shown in FIG. 3(b), the magnetic attraction force increases in the order of F3<F2<Fl. When the recording part of the magnetic ink is completely heated and has fluidity, it is possible to obtain the magnetic ink in FIG. 2(b)-2 or 2S(
As shown in b)-3, in order to deform or fly and transfer to paper, the magnetic attraction force must exceed a threshold. In addition, the threshold value also depends on the magnetization strength and flow characteristics of the magnetic ink.As a result of the study in this embodiment, the desirable shape of the electromagnetic head is B in FIG. 2, that is,
The gap at the tip is 1000 μm or less, preferably
It was concluded that A1 in FIG. 2, that is, the distance between the electromagnetic head and the magnetic ink, is 1.000 μm or less, preferably 500 μm or less. Furthermore, the magnetomotive force NI of the electromagnet (N is the number of turns, I is t current) is 50
A value of 0 or more, preferably 1.000 or more is suitable.

Furthermore, as shown in FIGS. 2(f') and (g), if an auxiliary magnetic pole 27 is provided on the side opposite to the electromagnetic head of the magnetic ink, it is possible to increase the magnetic field gradient at the position of the recording section ink 28. It is effective in increasing the magnetic attraction force.

As the material for the auxiliary magnetic pole, the above-mentioned high magnetic permeability materials and high saturation magnetic flux density materials are suitable.

Example (1-1) As the magnetic attraction means, an electromagnet spatula shown in FIG. 2(d) was used. Permendur (Co50) was used for the core, and the magnetomotive force Nl was 3000. The gap ('B) at the tip was 400 μm.

A thin film thermal head with a resolution of 180 DPI was used as a heat application means.

The ink medium used was a 4 μm thick PET (polyethylene terephthalate) film coated with a magnetic ink having the following composition by a hot melt method so that the ink thickness was 6 μm.

[Composition] 1 Magnetite fine particles 40wt%2 Carnauba wax 20wt%3 Paraffin wax
30wt%4 EVA 5
wt%5 dispersant twt%6 dye 4wt% and melting point is 70℃±
The temperature is 5°C.

A block diagram of the printing method according to this embodiment is shown in FIG. 2(a), where 21 is a thermal head, 22 is an ink medium, 23 is a transfer paper (Beck smoothness is 2 seconds), and 24 is an electromagnetic head. . Ink medium is PET film 25, magnetic ink 2
It consists of 6.

Ink transfer was performed using the above elements and configuration.

Table 1 shows the printing conditions and transfer efficiency evaluation results at this time.
The circuit diagram at this time is shown in No. 4150.

The pulse generator 41 generates a pulse, the inverter (negative logic) inverts the pulse, connects it to the base of the transistor 43, and applies energy to the thermal head heat generating resistor 44 as shown in Table 1 per dot. did.

The evaluation result of the transfer efficiency was expressed as a percentage of the amount of ink transferred to the transfer paper with respect to the amount of ink for the area of #II element (thermal element area ink thickness) for thermal and y-do.

Example (1-2) Ink transfer was performed using the same elements and configuration as Example (1-1), but changing the printing conditions as shown in Table 1.

Example (1-3) In Example (1-1), the electromagnetic head (7) N! was set at 5,000, and ink transfer was performed under different printing conditions as shown in Table 1.

Example (1-4) In Example (1-1), the tip gap (B) of the electromagnetic head was set to 30011. m, and ink transfer was performed under the same conditions as shown in Table 1.

Comparative Example (i-t) Using the same elements as in Example 1) (1-1),
), when the magnetic ink and transfer paper are applied with thermal energy, that is, directly below the thermal head,
They were placed so that they were in contact with each other, and ink transfer was performed under the same conditions as in Example 1).

Comparative Example (1-2) In the same configuration as Comparative Example 1), ink transfer was performed under the same printing conditions as in Example 2).

Example of using a permanent magnet as the magnetic attraction means [Example 2]
] Main cross-sectional views of the permanent magnet head in this example are shown in FIGS. 5(b) and 5(c).

27 is a permanent magnet, preferably a magnet with a large maximum energy product, such as an Arnif magnet, a Ba-ferrite magnet, a rare earth magnet, and the maximum energy product (hereinafter abbreviated as (BH) max) is 10 MGOe or more. Preferably.

The yokes 59 and 59' have a tapered tip at 59°. The material of the yoke is a high permeability material, i.e. F
e, Fe-8i, Fe-Ni.

Mu-Zu ferrite, N1-Zu ferrite, etc. are suitable. Furthermore, it is even more effective to use a high saturation magnetic flux density material such as Fe--Co for the tip of the fiber.

The gap at the tip (B in the figure) is 100 μm to 10
00 μm is desirable.

The magnetic ink 58 to be attracted needs to be placed at a position where there is a large graveyard gradient due to leakage of magnetic flux from the tip of the permanent magnet head.

That is, it is desirable that the distance (A) between the permanent magnet head and the magnetic ink is 1000 μm or less.

In the permanent magnet head shown in FIG. 5(b), magnetic ink is attracted in a direction transverse to the magnetic flux, and as shown in FIG. 5(c).
In the permanent magnet head shown in , magnetic flux is attracted in the same direction as the magnetic flux.

Example (2-1) A permanent magnet head shown in FIG. 5(b) was used as the magnetic attraction means. The yoke is permendur (Co50)
A Sam magnet with (BH)max=20 was used as a permanent magnet. The gap (B) at the tip was 200 μm.

A thin film thermal head with a resolution of 180 DPI was used as a heat application means.

The same ink medium as in Example (1) was used.

A block diagram of the printing method according to this embodiment is shown in FIG. 5(a), where 51 is a thermal head, 52 is an ink medium, 53 is a transfer paper (Beck smoothness is 2 seconds), and 54 is a permanent magnet head. be. The ink medium is composed of a PET film 55 and magnetic ink 56.

Ink transfer was performed using the above elements and configuration.

The circuit and printing at this time were carried out as in Example 4130, as in Example 1. Table 2 shows the printing conditions at this time and the evaluation results of transfer efficiency.

The evaluation result of the transfer efficiency was expressed as a percentage of the amount of ink transferred to the transfer paper with respect to the amount of ink (thermal element area x ink thickness) corresponding to the area of the thermal element of the thermal head.

Example (2-2) Ink transfer was performed with the same elements and configuration as Example (2-1) but with different printing conditions.

Example (2-3) In Example (2-1), (BH) of the permanent magnet head
Ink transfer was performed using an ink with a maximum value of 30 and changing the printing conditions.

Example (2-4) In Example (2-1), the tip gap (B) of the electromagnetic head was set to 150 μm, and ink transfer was performed under the same conditions.

Comparative Example (2-1) Using the same elements as Example (2-1), in the configuration shown in FIG. 4-b), the magnetic ink and the transfer paper were They were placed so that they were in contact with each other, and ink transfer was performed under the same conditions as in Example 1).

Comparative Example (2-2) In the same configuration as Comparative Example (2-1), Example (2-2)
Ink transfer was performed under the same printing conditions as in 2).

Example of Pulse Division Example (3-1) The temperature change of the ink in Example 1 is recorded in Figure 6. According to this, 0.1 m5 after applying the applied pulse.
After EC, the temperature begins to rise and reaches 70℃, which is the melting point of the ink.
is reached after 0.4m5eC. Also 0, 7
Around m5ec, the temperature reaches around 200°C.

Since printing is only possible when the ink has a temperature above its melting point, that is, when the ink melts, the effective printing time is 0.3 m5ec when the temperature is 70°C or above.

The circuit shown in FIG. 7(a) was created so as to lengthen the effective printing time.

Allow pulse generation section 71 to generate pulses; pulse generation section 7
The pulse generated in step 2 is inverted by the inverter 73 and combined with the NAND 74, and is passed to the base of the transistor 75 to generate a pulse in the thermal head heating section 76 as shown in FIG.
A voltage was applied as shown in b).

At this time, temperature changes as shown in FIG. 7(c) were recorded.

(However, other conditions were not changed at all.) According to this, the effective printing time is 0.8 ms ec. When printing was performed with this applied pulse, the printing quality was even higher than that obtained in Example 1. A density print was obtained.

Other methods include simply lengthening the application time without dividing the applied pulse, or simply increasing the applied voltage, but if you record the temperature change at this time, if the application time is increased, Figure 8 (a) If the applied voltage is increased as shown in Figure 8 (
As shown in b), the effective printing time increases in both cases, but 2
There are places where the temperature exceeds 00℃.

When the ink temperature exceeds 200° C., the PET that is the support layer becomes 300° C. or higher, which softens and melts the ink, changing its shape and, in the worst case, causing thermal damage such as the ink film breaking.

In addition, the magnetite particles in the ink become less magnetized as the temperature rises, and the magnetic attraction force weakens when the temperature exceeds 200°C.For this reason, it is necessary to simply lengthen the application time without dividing the applied pulse, or increase the applied voltage. The method of simply increasing the amount is not suitable for printing. In order to increase the effective printing time from now on, it is desirable to apply pulses in divided parts.

Example (3-2) The pulses performed in Example (3-1) were performed by reducing the printing energy as much as possible and at a temperature of 200°C above the melting point of the ink.
Figure 9 shows the settings reconfigured so that the following time becomes longer (
Printing was performed using the circuit shown in a).

The pulses generated by the pulse generator 91, the pulses from the pulse generator 92 are inverted by the inverter 93, the pulses from the pulse generator 94 are inverted by the inverter 95, and the pulses from the pulse generator 96 are inverted by the inverter 97. The inverted outputs are combined in a NAND circuit 98 and flowed to the transistor 99 to generate thermal head heat generating section 1.
00@9 A voltage was applied as shown in Figure (b).

The temperature change of the ink at this time was recorded as shown in FIG. 9(c), and the effective printing time was 0.8 msec. The applied voltage at this time is 5.0[VI X (0,5+ 0.lX3)Cm5a
c] −0.8 [aw]. When printing was performed using this applied pulse, printing of much higher quality than in Example 1 was obtained.

It is sufficient that printing can be performed using divisional pulse settings other than these [Embodiments (3-1) and (3-2)].

Further, if the melting point of the ink or the resistance value of the heating element of the thermal head changes, the settings of the applied voltage and divided pulses may be changed.

A similar effect can also be obtained by replacing the permanent magnet with an electromagnet.

Example of Pulse Bias Example (4-1) The temperature change of the ink in Example 1 is recorded in Figure 6. According to this, 0.1 m5 after applying the applied pulse.
After ec, the temperature of the ink starts to rise and reaches the ink's melting point of 70°C after 0°4 m5 ec. 0 again
, the temperature reaches nearly 200°C at around 7ms ec.

Printing is only possible when the ink reaches a temperature above its melting point, that is, when the ink melts, so the effective time for actual printing is 0.3 m at temperatures above 70°C.
It will be 5ec.

(This time will hereinafter be referred to as the effective printing time.) The circuit shown in FIG. 10(a) was created so as to increase the actual effective printing time.

The pulse generated by the pulse generator 101 is amplified to the applied voltage 103 by the transistor 102, and the pulse generated by the pulse generator 104 is also amplified to V2 by the transistor 105.
It can be amplified to 106. These two pulses are applied to the two transistors 107 and 108 of the same class, and the two pulses become a differential input, and the first
A voltage is applied as shown in FIG. 0(b).

When printing was carried out under these conditions, a record of temperature changes as shown in FIG. 10(C) was obtained. This is done by applying a low voltage before the applied pulse to bring the ink to 60°C before reaching its melting point.
By heating it to ℃, the effective printing time when applying pulses is extended, and from Figure 6 it is 0.7 m
Printing effective time of 5ec applied pulse is 0.6m5ec
When printing was performed using these settings, the printing was of higher density and higher quality than in Example 1.

Example (4-2) Figure 11(a) shows the low voltage application applied in Example (4-1).
This time, when it was applied after the applied pulse, a temperature change as shown in FIG. 11(b) was recorded. The effective printing time was 0.6@ec, the same as in Example 2, and when printing was performed with this setting, printing with the same density and quality as in Example 2 was obtained.

Example (4-3) In a combination of Examples (4-1) and (4-2), when low voltage was applied before and after the applied pulse as shown in Fig. 12(a), the 12th rXi ( The temperature change as shown in b) was recorded and the effective printing time was 0.65 m5ec in Example 2.3.
Printing with higher density and higher quality was obtained.

As long as printing can be obtained with settings other than these embodiments, any voltage and pulse width may be applied to the thermal head before and after the application pulse.

Example of thermal bias Example (5-1) Example of using thermal bias as a transfer assisting means.

FIG. 13(a) shows a schematic diagram of an embodiment of the present invention, in which a simulhead was used as the thermal energy applying means, a permanent magnet was used as the magnetic attraction generating means, and a dryer heater 138 was used as the preheating means.

As shown in No. 13@(a), during non-recording, the ink medium and the transfer paper did not come into contact with each other, and the distance was maintained at 120 μm directly below the head. The same ink medium as in Example 1 was used.

The permanent magnet is Sam with a maximum energy product of 25.3 MGOe.
A stone was used, and permendur, which is an Fe-Co alloy, was attached to the tip. Dryer heater (600W)
After preheating the film until the ink film surface temperature reached 40°C (the film surface temperature was measured up to the non-contact radiation temperature), I applied it with a thermal head with a resolution of 200 DPI before cooling it quickly, and the thermal spatula F20
When applied with a 00PI thermal head, the thermal head (applied energy -j'-0.5mJ/d or
) heating element (125μm x 140μm) area of 80
% or more of the ink surface area is transferred to the receiving paper (transfer efficiency 80
% or more), and high-quality printing was possible.

(Hereinafter, transfer efficiency shall refer to the above meaning.) Example (5-2) Same printing device as Example (5-1) (method combining the same permanent high stone and thermal head), same ink composition (or , the same transfer paper), and as a preheating means, use the method shown in Figure 13 (
A halogen lamp 139 (700W) was used as in b). After preheating the film until it reaches 40°C, which is the same as the ink film surface temperature, applying it with a thermal head (0
, 5 mJ/d at ) was transferred to the receiving paper with a transfer efficiency of 90% or more, and very high quality printing was achieved.

Example (5-3) Using the same printing device and the same ink composition as Example (5-1), both the ink film and transfer paper were irradiated with a halogen lamp 139, which is a heat bias, as shown in Figure 13 to preheat them. I let it happen.

The irradiation surface temperature was 40 for both the ink film and the transfer paper.
℃. When applied with a thermal head after preheating (0, 5
m J / d ot ) Transfer efficiency was 90% or more on the receiving paper, and very high quality printing was achieved as in Example (5-3).

In addition, the fixation of the ink to the transfer paper was very good.Fist Example (5-4) The same printing device and the same ink composition as in Example (5-1) were used, and the dryer heater 138, which was a heat bias type, was used. Both the ink film and the transfer paper were preheated until the irradiated surface temperatures of the ink film and the transfer paper reached 50° C. as shown in FIG. 13-(d). When applied with a thermal head after preheating (0,
(5 mJ/dat) transfer efficiency was 95% or higher, and high-quality printing was achieved.

Example (5-5) Using the same printing device and the same ink composition as Example (5-1), as shown in FIG. The ink dots on the transferred paper are irradiated with light until the surface temperature reaches 40°C before they cool down, so that the ink dots are completely fixed on the transferred paper, and the area of the dots is melted and enlarged by heat. . The transfer efficiency was 80% or more on the transfer paper, and high quality printing was possible.

Example (5-6) Using the same printing device and the same ink composition as Example (5-1), as shown in FIG. 13(f'), as a thermal bias means,
After the ink dots have been transferred by the thermal head, the halogen lamp 139 is irradiated with the ink dots on the transfer paper until the surface temperature reaches 50° C. before they cool down, thereby completely fixing the ink dots on the transfer paper and expanding their area. The transfer efficiency was 85% or more on the transfer paper, and high quality printing was possible.

The results of Examples (5-1) to (5-6) are summarized as above.

Comparative Example (5-1) As shown in Figure 4, when the thermo-pressure magnetic ink of the ink medium is applied with heat from the base film surface by the thermal head, it is brought into contact with the transfer paper and the melted ink is transferred to the transfer paper. When the ink medium was peeled off from the receiving paper and the ink was transferred, the transfer efficiency was only 40%, resulting in very poor printing quality.

Example of heat roller Example (6-1) Figure 14 shows the device used in Example 1 (Figure 2 (a))
This is the printing device of this embodiment in which a heat roller (surface material made of silicone resin) is added to the image forming apparatus.

The temperature of the heat roller is around the melting point of the ink, 55°C to 60°C.
, using a magnetic film with the same ink composition, and applying 0.45 mJ/d to the thermal head.

A dot is recorded on the transfer paper by applying energy of t, and before the recorded dot cools down, a pressure of 1 is applied with a heat roller.
When rolled at 00 g/cm, dots were recorded on the transfer paper with a transfer efficiency of 90% or more, resulting in very high quality printing.

FIG. 15 shows the details. First, the ink dots 15 are transferred onto the transfer paper 145 by the thermal head.
In 0, the surface material is made of a silicon tree layer, and it is rolled with a heat roller 148 that has a halogen lamp 149 (500W) as a heat source inside, and the ink dots were transferred independently, but were transferred by heat pressure. The increase in the transfer area results in a line transfer object 141.

The following example is the 15th rI! The method shall be similar to that of J.

Example (6-2) The same application device and the same heat roller as in Example (6-1) were applied to the same transfer paper, the temperature of the heat roller was maintained at 55 to 60°C near the melting point of the ink, and the same ink composition was used. Using a magnetic ink film of The image was transferred onto the receiving paper with an efficiency of 80% or more, and a high-quality print was obtained.

Example (6-3) The same heat roller was applied to the same transfer paper using the same application device as in Example (6-2), the temperature of the heat roller was maintained at 55 to 60 °C near the melting point of the ink, and the same ink composition was used. Using a magnetic ink film of 75%
The image was transferred onto the transfer paper in the above manner.

Example (6-4) The same heat roller was applied to the same transfer paper using the same application device as in Example (6-1), and the temperature of the heat roller was set to 45%.
Maintained at ~50℃, used magnetic ink film with the same ink composition, and applied energy of the thermal head to 0.45 m.
After applying the ink at J/dot and before the ink cools down, press the ink dot on the transfer paper with a heat roller at 120 g/dot.
am'', the transfer efficiency was 90% or more and the transfer was transferred onto the receiving paper, resulting in very high quality printing.

Example (6-5) Using the same application device, same transfer paper, and heat roller as in Example (6-1), the temperature of the heat roller was set to 40 to 45
℃, use a magnetic ink film with the same ink composition, apply 0 energy of the thermal head, 45 m
If the ink dots on the transfer paper are rolled with a pressure of 120 g/cm'' with a heat roller after the ink is applied at J/dot and before the ink cools down, the ink dots will be transferred onto the transfer paper with a transfer efficiency of 85% or more, resulting in high quality. A print was obtained.

Comparative Example (6-1) As shown in FIG. After adhering the ink medium to the transfer paper, the ink medium was peeled off from the transfer paper to transfer the ink, but the transfer efficiency was only 40%, resulting in very poor printing quality.

Example in which the surface of the ink medium is uneven [Example 7] The main cross-sectional views of the ink medium in this example are shown in FIG. 16(a), FIG. 16(b), and FIG. 16(C). , the support layer 161 is made of polyethylene terephthalate (P
ET), polyyside, polyacidoid, polyether ether ketone, polysulfone, polyether sulfone, etc., and the thickness of the support layer is preferably 1 ttm to 10 μm.

The binder of the magnetic ink 162 mainly contains wax and polymer. Thermal temperature is 50℃~250℃
The ingredients include paraffin wax, microcrystalline wax, carnauba wax, α-olefin/maleic anhydride copolymer, oxidized wax, polyethylene wax, fatty acid amide, fatty acid ester, ethylene-vinyl acetate copolymer, and ethylene. - Thermoplastic materials such as ethyl acrylate and distearyl ketone are preferred.

The ferromagnetic material contained in the thermoplastic magnetic ink is magnetic fine particles of metals or alloys such as magnetite, Mu-Zu ferrite, N1-Zu ferrite, garnets, Fe, Co, Ni, etc., and the particle size is , 10 people to 1
0.000 people, preferably 500~s, ooo people. The coating amount of magnetic ink is 5g/m” to 30g/m”
m″ is desirable.

Further, the average pitch (A 2 ) of the unevenness needs to be equal to or shorter than the arrangement pitch of the thermal elements. That is, when used in a printing method that requires high resolution, the thickness is preferably 5 μm to 150 am.

In addition, it is better to increase the height of the unevenness for a certain amount of coating in order to increase the surface area, but it is necessary to keep it to a level that does not reduce the heat conduction efficiency from the support layer.
The thickness is preferably 1 μm to 20 μm.

Example (7-1) The structure of the ink medium according to this example is shown in FIG. 16-a). A 4 μm thick PET film was used as the support layer. The thickness of the magnetic ink was determined by coating an ink having the composition shown below using a gravure hot melt method so that the coating amount was 15 g/m'.

[Magnetic ink composition]

1. Magnetite (particle size 0.2μm) 50
wtX2, α-olefin/maleic anhydride 10wt
X copolymer 3, paraffin wax 30wtX4,
Ethylene-ethyl acrylate SwtX copolymer 5, dye
The uneven shape of the surface of the 5v oyster has an average pitch of 5.
0 μm 1 roughness average height was 5 μm.

Ink transfer was performed using the above ink medium. A block diagram of the printing method is shown in FIG.

171 is a thermal head (resolution 180DP ■), 17
2 is the ink medium of this example, 175 is a PET film, and 176 is magnetic ink.

173 is a transfer paper (Beck smoothness is 1 second), and 174 is an electromagnetic head as a magnetic attraction means.

The conditions for ink transfer are 0.7 mJ/dot and the magnetomotive force of the electromagnet N! is a, ooo.

The transfer efficiency was evaluated by expressing the amount of ink transferred to the transfer paper as a percentage of the amount of ink corresponding to the area of the thermal element of the thermal head (thermal element area x ink thickness). The results are shown in Table 4.

Example (7-2) The structure of the ink medium according to this example is shown in FIG. 16(b). The support layer and magnetic ink were prepared as in Example (7).
-1) was used.

Regarding the uneven shape of the surface, the average pitch of the unevenness was 60 μm, and the average height of the unevenness was 20 μm.

The ink transfer method and conditions were the same as in Example (7-1).

Example (7-3) The structure of the ink medium according to this example is shown in FIG. 16(c). The support layer and magnetic ink were prepared according to Example (7).
-1) was used.

The magnetic ink layer was coated by a gravure-offset hot melt method and then pressed with a hot roll having an uneven surface to form an uneven surface.

The average pitch of the surface unevenness is 30μm1 The average height of the unevenness is:
It was set to 10 μm.

The transfer method and conditions were the same as in Example (7-1).

[Comparative Example] The structure of the ink medium in this comparative example is shown in FIG. The support layer and magnetic ink were prepared in Example (7-1).
).

The magnetic ink layer was formed by a gravure-offset hot melt method. In other words, the average height of the surface irregularities is zero,
Footed to make it smooth.

The transfer method and conditions were the same as in Example (7-1).

Example of overcoat [Example 8] The structure of the thermally recirculating magnetic ink medium of this example will be explained with reference to FIG. 19.

191 is a support layer, 192 is a previous collective magnetic ink layer, 1
93 is an overfoot layer.

It is desirable that the support has heat resistance, mechanical strength, and high smoothness. Materials include resin films such as polyethylene, polypropylene, polystyrene, polyimide, polyether sulfone, and polyethylene terephthalate. The thickness is preferably 1 to 30 μm, preferably 1 to 10 μm.

As binders for the overcoat layer and the magnetic ink layer mentioned above, paraffin wax, microcrystalline wax, carnauba wax, oxidized wax, candelilla wax, montan wax, Sasol wax, Fischer-Tropwax, polyethylene wax, α-olefin/anhydrous are used. Maleic acid copolymer, fatty acid amide, fatty acid ester, distearyl ketone, ethylene-
114 vinyl copolymer, ethylene-ethyl acrylate fubolymer, epoxy resin, etc., or a mixture thereof.

Examples of the ferromagnetic material contained in the thermoplastic magnetic ink layer include magnetite, manganese zinc ferrite, nickel zinc ferrite, carnets, magnetic particles of metals or alloys, and the particle size is 10 to 10,000,000,000,000,000. Preferably 500 to s, ooo people.

There are two printing methods using thermoplastic ink media: a contact type (Figure 20) in which the transfer part makes contact, and a non-contact type (Figure 21).
(Fig.)

A thermally layerable magnetic ink medium shown in FIG. 19 was prepared and thermal printing was performed.

A thermal head was used as a thermal energy applying means, a permanent magnet was used as a magnetic attraction force generating means, and the printing method was a non-contact type shown in FIG. 21. To explain the embodiment, as shown in FIG. 21, a thermal head 211, an ink medium 212, a transfer paper 213, and a magnet 214 are installed in this order, and the previously processed magnetic inks 216 and 217 of the ink medium are supported by the thermal head. The ink is transferred by applying heat from the surface of the body 203.

Polyethylene terephthalate film and polyimide are used as the support, and the overcoat layer composition (viscosity), ink layer composition, overcoat layer thickness, ink layer thickness, and support layer thickness are used as parameters to determine the magnetic properties. Ink media was produced.

Example (8-1) [Overcoat layer composition] Microcrystalline wax (HNP-3) Ichiki wood wax - 70 wt% Carnauba wax Ikko fine products 23 wt% ethylene -
Ethyl acrylate (MB-080) Ichi Nippon Unicar 7wt% viscosity -7
0c p (100℃) [Previous ■Magnetic ink layer] Magnetite fine particles (1,000 people) 40wt% Refined paraffin wax () INF-3) - Hiki Seiro -
30wt% Carnauba Wax No. 1 Ikko Fine Products 19wt% Ethylene/
Vinyl acetate copolymer resin (EvA-410) - DuPont Mitsui Polychemicals - 7wt% dye
3.9wt% dispersion
Agent 0.1wt%
Example (8-2) [Overcoat composition] Para 74 wax (Hl-Mic-2045) - Hiki Seiro - 96 wt% Ethylene vinyl acetate copolymer resin (EVA-410) - Sandon DuPont Polychemical - 4 wt% Viscosity -30cp
(100°C) [Ink layer composition] Same as Example (8-1) Example (8-3') [Overfoot layer composition] Same as Example (8-1) [Ink layer composition] Example (8 -1) Same example (8-4) [Overcoat layer composition] Paraffin wax (145'F) - Hiki Seiwax - 90wt% Ethylene/vinyl acetate copolymer resin (EVA-577) -
Mitsui DuPont Polychemical-10w, t% viscosity...
70cp (100℃) [Ink layer composition] Magnetite fine particles (1,000 people) 40wt% Paraffin wax (NHP-9) - Hiki Seiro - 39wt% α-olefin maleic anhydride copolymer - Mitsubishi Kasei-1
0wt% ethylene/vinyl acetate copolymer resin (EVA-577)-
Mitsui DuPont Polychemical-7wt% dye
3.9wt 5 minutes
Powder 0.1wt
% In the above examples, Examples (8-1) and (8-2) are media with different compositions of particle sizes in the overfoot layer, and Example (8-3) is media with different overfoot layer thicknesses. of,
In Example (8-4), the transfer efficiency was examined using media in which the thickness of the support layer and the ink layer were different, and the ink layer composition was different.

Comparative Example (8-1) A conventional pre-collective magnetic ink medium consisting of a support layer 221 and a thermally revolvable magnetic ink layer 222 as shown in FIG. 22 was manufactured.

[Ink layer composition]

It is the same as Example (8-1).

Comparative Example (8-2) [Overcoat layer composition] Microcrystalline wax CH4-Mlc-1045) Ichippon Seiro - 65 wt% Carnauba wax Ikko Fine Products 25 wt% ethylene -
Ethyl acrylate (MB-080) Ichi Nippon Unicar 10wt% viscosity・”
200 cp (100°C) [Ink layer composition] Same as Example (8-1).

Comparative example (8-3) The regulation of the thickness of the overfoot layer was studied.

[Overfoot layer composition]

Same as Example (8-1).

[Ink layer composition]

Same as Example (8-1).

Using the above Examples and Comparative Examples as transfer conditions, the permanent magnet is a Sin magnet with a maximum energy product of 20 MGOe, and the applied energy is 0 using a thermal head with a resolution of 300 DPI.
, 3 nJ/dot. Rough vapor with a Beck smoothness of 3 seconds was used as the transfer paper.

The printed samples were evaluated in terms of transfer rate and dot reproducibility, and the results are shown in Table 8-1.

As shown in Table 8-1, the pre-printed magnetic ink medium provided with the overfoot layer of the present invention achieved an extremely excellent transfer rate and dot reproducibility, and was able to print with extremely high quality. In addition, equivalent results were obtained even when the support was changed. At this time, the optimal thickness of the overfoot layer was 5 μm or less.

The thicknesses of the ink layer and the support layer are preferably 40 am or less and 30I1 m or less, respectively, since this may lead to a decrease in thermal efficiency.

Further, the heat generating means can provide the same effect not only in the thermal head but also in the current-carrying head.

It goes without saying that the magnetic attraction means may also be an electromagnet.

Examples of Undercoat Example 9 The structure of the previously concave magnetic ink medium of this example will be explained in the 23rd @.

231 is a support layer, 232 is an undercoat layer, 233
is the previous magnetic ink layer.

It is desirable that the support has heat resistance, mechanical strength, and high smoothness.Materials include polyethylene, polypropylene, polyester, polyimide, polyether sulfone, polyethylene terephthalate, etc. is preferably 1 to 30 μm, preferably 1 to 15 μm.

Binding agents for the underfoot layer and the magnetic ink layer include paraffin wax, microcrystalline wax, carnauba wax, oxidized wax, candelilla wax, montan wax, Fi/Schartropsch wax, and α-olefin/maleic anhydride copolymer. Previous article
or a mixture thereof.

The ferromagnetic materials contained in the thermoplastic magnetic ink layer include magnetite (Fe304), manganese zinc ferrite (Mn-Zn-Fe304), nickel zinc ferrite (N(-Zn-Fe304)), garnets, metals or alloys. Magnetic particles, etc., and the size of one particle is 10
People ~ IQ, OOO people, preferably 500 people ~ 5.000 people
Good people.

There are two types of printing methods using thermoplastic magnetic ink media: a contact type (Fig. 24) in which the transfer part makes contact, and a non-contact type (Fig. 25).
(Fig.)

-Example- A thermal head was used as a thermal energy applying means, a permanent magnet was used as a magnetic attraction force generating means, and the printing method was performed using a non-contact type 25vlA. To explain its embodiment, as shown in FIG. 25, it is installed at the head of a thermal head 251 - an ink medium 252 - a transfer paper 253 - a magnet 254, and thermally circulating magnetic ink 256 and 257 of the ink medium are installed.
The ink can be transferred by applying heat from the surface of the support 243 using a thermal head.

Two types of support, polyethylene terephthalate film and polyimide film, were used, and the parameters were the underfoot layer composition, ink layer composition, undercoat layer thickness, ink layer thickness, and support layer thickness. A magnetic ink medium was produced.

Example (9-1) Undercoat layer composition Paraffin wax (157°F) - Hiki Seiro - 50 wt% Microcrystalline wax (Hf-Mfc-1045) Ichi Nippon Seiro - 43 wt% Ethylene/vinyl acetate copolymer resin (EVA-577)-
Mitsui DuPont Polychemical - 7vrt% [Last time star magnetic ink layer composition] Magnetite fine particles (1,000 people) 40wt% Microcrystalline wax (Hi-Mlc-1045) Ichiki Kiwaxu - 35wt% Carnauba wax Ikko Fine Brodaquin 16wt% ethylene/
Vinyl acetate copolymer resin (EVA-577) - DuPont Mitsui Polychemicals - 5wt% dye
3.9 wt% variance
Agent 0.1wt% Example (9-2) Undercoat layer composition Paraffin wax (145°F) - Hiki Seiyaku - 95wt% Ethylene vinyl acetate copolymer resin (EVA-410) Dupont Ichii Polychemica J-ray The 5wt% ink layer composition is the same as in Example (9-'1).

Example (9-3) The underfoot composition is the same as in Example 1.

Ink tank composition Magnetite fine particles (1,000 people) 40wt% Paraffin wax () (NP-3) - Hiki Seiro - 36wt% Ethylene-ethyl acrylate (MB OBO) Ichi Nippon Unicar 10 wt% Carnauba wax Ikko Fine Bro Dakun 10wt% dyed
Fee 3.9wt%
Dispersant 0.1
wt % Example (9-4) The undercoat layer composition and ink layer composition are the same as in Example 1.

In the above examples, Example 1 and Example 2 examine the ink transfer efficiency due to the difference in undercoat layer composition.
In Example 3, we examined the transfer efficiency due to differences in the composition of the ink layer and the thickness of the support layer and ink layer, and in Example 1 and Example 4 we examined the transfer efficiency due to differences in the thickness of the undercoat layer. did.

Comparative Example (9-1) A conventional M-magnetic ink medium comprising a support layer 261 and a M-magnetic ink layer 263 as shown in FIG. 26 was manufactured.

The ink layer composition is the same as in Example (9-1).

Comparative Example (9-2) The underfoot layer was made thicker, and Example (9-1) and Example (9-4) were compared.

The composition of the undercoat layer and ink layer is as in Example (9-1)
is the same as

Using the above examples and comparative examples as transfer conditions, a Sam magnet with a maximum energy product of 30 MGOe was used as a permanent magnet, and a thermal head with a resolution of 300 DPI was used to apply 0 energy.
．． Printing was performed at 3 nJ/dot. Rough paper with a Beck smoothness of 3 seconds was used as the transfer paper.

The printed samples were evaluated in terms of transfer rate and dot reproducibility, and the results are shown in Table 9-1.

As shown in Table 9-1, the heat-circulating magnetic ink medium provided with the underfoot layer of the present invention achieves excellent transfer rate and dot reproducibility even on rough paper with a smoothness of 3 seconds, resulting in extremely high-quality printing. was completed.

Furthermore, similar results were obtained even when the support was changed. At this time, the optimum thickness of the undercoat layer was 5 μm or less.

Further, the heat generating means can provide the same effect not only in the thermal head but also in the current-carrying head.

-Other Examples- Each of the above embodiments can be used independently, and the heat generating means is not limited to the thermal head, but can be implemented with any thermal transfer method such as an electric thermal transfer method, and the same effect can be achieved. can.

Further, it is also possible to implement two or more of the respective embodiments in combination, in which case all effects such as the transfer rate will be synergistically improved.

In that case, the combinations with the highest transfer efficiency, good printing quality, and least printing energy are Examples 2, 3,
This was a case of combining 5, 6, 7, and 8.9.

No. 27 @ is an example of the device of the present invention when a serial type (180DPi, 24 pins) is used for the thermal head, which was created by combining the above embodiments. The thermal head 271 and magnetic head 272 face each other,
Both are driven by belts and move together while maintaining a constant distance from each other. At this time, the magnetic ink film 273 is taken up by a take-up roller 275 in synchronization with this movement.Halogen lamps 274 are installed on both sides of the thermal head 271, and the magnetic ink film 273 is heated before and after transfer. is added.

Further, the magnetic ink film 273 at this time has an uneven structure and has an overfoot layer and an underfoot layer.

Further, the heat application energy is applied in a time-division manner, and pulse bias energy is applied as auxiliary application both before and after the heat application.

The structural diagram when the transfer paper 283 is inserted is shown in FIG. 28. During printing, the transfer paper 283 and the magnetic ink film 273 are kept at a distance of 100 μm without contacting each other, and the printed recording dots are heated. Hot rolling is performed using rollers 281 and backup rollers 282. At this time, the recording dots have transfer efficiency (1
00%) were obtained, the characters were free from smearing, and the printing speed was also increased.

FIG. 29 shows an example of an apparatus according to the present invention in which a line head is used as the thermal head, and the structure is basically the same as the embodiment of the apparatus using a serial head.

The thermal head 291 and the magnetic head 292 face each other, and the vertical distance between them is set to be constant at any part of the thermal head 291 at a temperature of .degree.

During printing, the transfer paper 297 and the magnetic ink film 296
The printed dots are placed between the heat roller 281 and the backup roller 28, keeping the distance 100 μm without contact.
29 g of hot-rolled recording dots are obtained in Step 2. Halogen lamps 296 are installed on both sides of the thermal head 291 to apply a thermal bias to the magnetic ink film 296 before and after transfer.

Further, the magnetic ink film 296 at this time has an uneven structure and has an overcoat layer and an underfoot layer.

Further, the heat application energy is applied in a time-division manner, and pulse bias energy is applied as auxiliary application both before and after the heat application.

At this time, recording dots with high transfer efficiency (100%) were obtained not only in the conventional but also in the example slippers, and there was no smudging of characters, and the printing speed was increased.

The embodiments described here are merely examples, and are not limited to the present embodiments.The embodiments described here are merely examples, and the present invention is not limited to the present embodiments. Effective for all photography methods and devices.

In addition, in the above embodiment, the method in which the energy applied for recording dot transfer is time-divided and applied to the ink in two or more times is a method in which the ink and the transferred object do not come into contact with each other in the non-recorded portion of the ink (non-contact). This method is effective not only for (type) printing devices but also for contact type printing devices.

Further, a method of adding bias energy as auxiliary application energy is also effective in a contact type printing apparatus if the auxiliary application energy is applied after the thermal energy for transfer is applied. In this case, the surface portion is melted by the auxiliary applied energy even if there is little ink.

Similarly, when applying a thermal bias, even a contact type printing device is effective as long as the thermal bias is applied after printing.

Further, in the ink medium used in the above-mentioned printing apparatus, etc., the surface of the magnetic ink layer is provided with irregularities, and the surface of the ink layer is provided with an overcoat layer. Techniques such as providing an underfoot layer between the ink layer and the support are effective not only in non-contact type printing devices but also in contact type printing devices.

〔Effect of the invention〕

As explained above, a heat applying means having a plurality of heating elements is disposed on the back of the film coated with the α-previously concave magnetic ink, and the heat applying means having a plurality of heating elements is arranged opposite to the front film with a space between the transfer medium and the transfer medium.
According to the printing apparatus of the present invention, a magnetic attraction force generating means is provided on the back of the printing apparatus, and the ink is ejected onto the transfer medium in accordance with the pitch of the plurality of heating elements. Clear prints can be made.

Further, according to the present invention, the ink has a means for applying thermal energy to the recorded portion of the magnetic ink and a means for generating a magnetic attraction force to the ink, and the recording of the ink is controlled by controlling the application of thermal energy. In a printing device that transfers a portion to a transfer medium by magnetic attraction, if the ink and the transfer medium do not come into contact with each other at the ink-recorded portion, the process of peeling off the ink medium becomes unnecessary, and , it is possible to greatly increase the ink transfer efficiency.

In addition, if a non-contact type is used, the ink is transferred regardless of the surface shape of the transfer medium, so that recording dots with a normal shape, that is, with high transfer efficiency, can be obtained. Therefore, it is possible to form high-quality characters and images even on paper with extremely poor surface smoothness, film with poor affinity with ink, and the like.

Furthermore, if the recording area and the transfer medium are not in contact with each other, smearing of letters will not occur.

Furthermore, since the heat loss is extremely small, the heat application energy can be reduced, and by shortening the application time, it is possible to speed up printing. Furthermore, when a magnet is used as the magnetic attraction means, the attraction force can be controlled, and the power can be turned off when not transferring, thereby preventing magnetic dust, ink, etc. from adhering to the electromagnetic head. can be hindered.

In addition, when a permanent magnet head is used as the magnetic attraction means,
It is possible to create an energy-saving printing device.

In addition, when heat energy applied from a thermal head is applied to the ink in a time-divided manner, the temperature of the ink is not increased more than necessary, so the ink itself is not thermally destroyed, and the transfer is Printing with even better transfer efficiency can be achieved with the minimum required heat application energy, making it possible to create an energy-saving printing device.

In addition, when applying auxiliary energy before, after, or both before and after applying heat energy from a thermal head, the temperature of the ink must be raised to around the melting point in advance, or the heat energy applied during printing must be Either maintain the temperature of the ink that has increased due to the energy, or
Since it can do both, it is possible to reduce the heat applied energy during printing and print with even better transfer efficiency.
Furthermore, printing speed can be increased.

In addition, if a thermal bias is applied to the ink before and/or after printing, or both before and after printing, the ink must be already in an activated (melted) state before the thermal printing energy is applied, or Because the activated (melted) state can be maintained for a long time even after the printing energy is applied, or both, it is possible to perform transfer using less thermal printing energy, which is impossible with conventional methods, and the transfer efficiency is also greatly improved. , because less thermal printing energy is required, printing can be done faster and with higher density.

In addition, when a heat roller is provided, the area of the recording dot can be greatly expanded by hot rolling the recording dots that have been recorded on the transfer medium with the heat roller, and the area of the recording dot can be greatly expanded. It is possible to improve the fixing power between the two.

Furthermore, by enlarging the recording dots, less thermal printing energy is required than in the past, which allows faster printing and higher printing density.

Furthermore, when the surface of the ink has an uneven structure, less work is required to deform or fly the ink in response to a certain magnetic attraction force, compared to a conventional smooth surface. Therefore, it is possible to greatly increase the transfer efficiency. It requires less energy to apply heat than before,
This allows for faster printing and higher density printing.

Further, by providing an overfoot layer on the upper surface of the ink and by providing an underfoot layer on the back surface of the ink (between the support layer and the ink), the transfer efficiency can be greatly improved.

Needless to say, in addition to the effects described above, the effects can be synergistically increased by combining the above features.

From these facts, the present invention has the following advantages: 1. It is possible to print recording dots with very high transfer efficiency on transfer paper with poor surface smoothness or on a film that does not have a very high affinity with the ink.

2. Can prevent smudging of characters.

3. Heat loss during heat application during printing is extremely small.

4. It is possible to increase the density of recording dots.

It has the effect of at least one term or more.

Furthermore, the present invention is not limited to this embodiment, but is effective for all printing methods and devices that transfer the recorded portion of the previously recorded magnetic ink onto the transfer target using magnetic attraction force by controlling thermal energy. be.

[Brief explanation of drawings]

Fig. 1 - Detailed explanatory diagram of the present invention Fig. 2 - (a) Detailed explanatory diagram of the present invention (b) Operation explanatory diagram of Embodiment 1 (c) to (g) Electromagnet configuration diagram of Embodiment 1 Figure 4 - Circuit configuration example of Embodiment 1 Figure 5 - (a) Detailed explanatory diagram of the present invention (b) - (c) Explanatory diagram of the tombstone structure side of Embodiment 2 Figure 6 - Embodiment 1 Ink temperature one hour graph Figure 7 - (
a) An explanatory diagram of the circuit configuration side of Actual Example 3-1 (b) An explanatory diagram of the pulse application side of Example 3-1 (c) An hourly ink temperature graph of Example 3-1 Figure 8 - for Example 3 Comparative example explanatory diagram Figure 9-(a)
An explanatory diagram of the circuit configuration side of Example 3-2 (b) An explanatory diagram of the pulse application side of Example 3-2 (c) An hourly ink temperature graph of Example 3-2 Figure 10 - (a) Example 4- 1 circuit #l example explanatory diagram (b) Example 4-1 explanatory diagram with pulse marking (c) Ink temperature one hour graph of Example 4-1 Figure 11-(a) Example 4-2 (b) One-hour graph of ink temperature of Example 4-2 (a) Explanatory diagram of pulse application side of Example 4-3 (b) Ink temperature of Example 4-3 Time graph Figure 13 - (a) Explanatory diagram of the configuration side of Example 5-1 (b) Explanatory diagram of the configuration side of Example 5-2 (c) Explanatory diagram of the configuration side of Example 5-3 (d) Example Explanatory diagram of the configuration side of 5-4 (e) Explanatory diagram of the configuration side of Example 5-5 (f') Configuration example diagram of Example 5-6 Morning section FIG. 14 - Configuration example diagram of Example 6-1 Morning section section Figure 15 - Operation explanatory diagram of Example 5-1 Figure 17 - Configuration example diagram of Example 7 Figure 18 - Comparative example diagram of Example 7 Figure 19 - Ink layer with overcoat of Example 8 Explanatory diagram Fig. 20 - Example B contact type configuration example diagram Fig. 21 -
Non-contact type configuration example of Example 8 Figure 22 of the morning room - Example 8
Fig. 23 - An explanatory diagram of an ink layer with undercoat of Example 8 - Fig. 24 - An explanatory diagram of a contact type structure example of Example 9 - Fig. 25 -
Non-contact type configuration example of Example 9 Figure 26 - Example 9
Fig. 27 - Explanatory diagram of the structure near the head of the serial type printer of the comprehensive embodiment Fig. 28 - Explanatory diagram of the operation of the serial type printer of the comprehensive embodiment Fig. 29 - Line of the comprehensive embodiment A structural diagram and an example of operation near the head of a type printer Figure 30 - A diagram explaining the configuration of the conventional example Figure 31 - An illustration of transfer problems in the conventional example Figure 32 - When printing on rough paper with the conventional example Problem explanatory diagram Figure 33 - Recorded dot explanatory diagram printed on rough paper in conventional example Applicant: Seiko Epson Corporation Figure 1 Figure 2 (c) Figure 2 (d) (e) Figure 2 (f) ) Fig. 2 Q X+Xz X3 →X (21
Figure 3 Figure 4 (Q) Figure 5 (C) Figure 5 Figure 6 (a) 0 0.7 0.9
+, 4 top sword a time (msec (b) Fig. 7 (c) Fig. 7 ETI opening time sec) (b) Fig. 9 ( c) Figure 9 cc (a) Figure 10 6p sword 06! Between (m Shibe → (b) (C) Fig. 10 0.4 EV 710 @ between (msec) Fig. 11 Uto rJB + between (msec) (a) -r sum time (ζ circle) (b) 12th Figure (a) (b) Figure 13 (c) (d) Figure 13 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 23 Figure 24 Figure 25 Figure 26 Figure 284 Figure 29 Figure 30 Figure 31

Claims (1)

[Claims] A heat applying means having a plurality of heating elements is arranged on the back of the film coated with thermoplastic magnetic ink, a transfer medium is placed on the front facing the film with a space therebetween, and a magnetic attraction force generating means is placed behind it. A printing apparatus characterized in that the ink is ejected onto the transfer medium in accordance with the pitch of the plurality of heating elements.