JPS62146686A - Printing method - Google Patents

Abstract

PURPOSE:To print a high quality character or image even on receiving paper extremely inferior in surface smoothness or a film not too high in the compatibility with ink, by a method wherein a heat energy applying means and a magnetic attraction means are provided to a recording part of thermoplastic magnetic ink and the ink recording part is transferred to a receiving medium under the control of the application of heat energy by magnetic attraction force. CONSTITUTION:A thermal head 21 is used as heat energy applying means and a permanent magnet 26 is used as a magnetic attraction force generating means and, in printing, a pulse is generated in a pulse generating part 31 to be reversed by an inverter 32 while the inverter 32 is connected to the base of a transistor 33 to apply voltage of 5.0V per one dot to a thermal head heat generating resistor 34 for 0.7msec. Because this system is non-contact, the escape of heat and the contamination of a character are reduced and a printed dot has a shape of which outline is clear and the whole of the dot also has high density and high quality.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-impact printing device, and more specifically, it transfers thermoplastic magnetic ink to a transfer medium by the action of heat and magnetism, and prints characters 0 It concerns a printing method for obtaining an image.

[Conventional technology]

Many books using magnetic ink have been proposed as a compact, low-cost, non-impact printing method.

For example, a method disclosed in Japanese Patent Application Laid-Open No. 52-96541 uses magnetic ink as the ink of the fusion thermal transfer method, and a magnetic means provided separately from the heat supply means exerts a full magnetic attraction force on the ink corresponding to the thermal image. This is a transcribed copy. That is, as shown in FIG.
- Ink medium 122 - Transfer paper 125 - Magnet 126 are installed in this order, and the thermoplastic magnetic ink 124t of the ink medium is transferred when heat is applied from the base film 12!1 by the thermal head (directly below the head). in contact with paper,
After melting and applying the ink to the transfer target, the ink medium is peeled off from the transfer target paper and used to transfer the ink. Furthermore, the magnetic attraction force has the effect of reducing the probability of contact of the molten ink with the transfer paper, and the effect of increasing the transfer rate to the paper when the ink medium is peeled off. This makes it possible to print high-quality character zero images even on rough paper.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, when the ink medium is peeled off, the ink in the recording area to be transferred comes into contact with the base film and the ink in the non-recording area.
A force acts to peel off the ink in the recording area that has been fused and adhered to the transfer paper together with the base film, causing transfer defects. In Figure 11, in general thermal transfer recording, there are two forces: FA (ink-to-transfer paper adhesion force) and FB (ink cohesive force), which promote the transfer of ink from the recording section to the transfer paper, and FB (ink cohesive force), which prevents transfer. force, FC (ink-base film indirect layer force) and FD
During (#jk coming force between recording unit ink and non-recording ink), FB, is the person >>! Po or l? If the relationship 'D always holds true, transcription is complete.

In the figure, 111 is a base film, 112 is recording part ink, 113 is non-recording part ink, and 114 is transfer paper.

In the conventional method, the melted ink is pulled toward the transfer paper by the total magnetic attraction of the ink, which has the effect of increasing the probability of contact with the transfer paper and increasing the tlI value in FIG. 11. In other words, compared to the general thermal transfer method,
Although the ink transfer rate has decreased, FC is still
, FD, the above-mentioned F A < FC
There is a problem that +F D occurs and transfer defects occur! The present invention is intended to solve these problems, and its purpose is to transfer paper with very poor surface smoothness or with very low compatibility with ink. ) We aim to provide a printing method that allows non-G, VC cylinder quality character 0 image gold printing even on less-than-perfect films.

[Means for solving problems]

The printing method of the present invention includes the steps shown in FIG.
and means 15 for generating a magnetic attraction force to the ink,
This is a printing method in which the ink-recorded portion is transferred to the transfer medium 14 by magnetic attraction by controlling the application of thermal energy, and the ink and the transfer medium are connected to the non-recorded portion 1 of the ink.
2FM is the magnetic attraction vector. ), it is assumed that there is no contact at ft1%. In addition, in the drawing, the above-described printing method is further characterized in that the means for applying thermal energy is a thermal head.

Furthermore, in the above printing method, when applying the thermal energy key from the thermal head, pulses of a low ratio are applied before or after the thermal energy keying, and the ink is heated. Features a preheating method.

[For production]

According to the above fμ method of the present invention, the thermoplastic magnetic ink and the transfer medium do not come into contact with each other in the non-recording portion of the ink. Thus, ink transfer is accomplished by magnetic attraction in the thermally activated state of the ink, eliminating the need for the prior art process of peeling off the ink media. That is,
At the ttH, FO and EFD, which prevented transcription, were 0.
Therefore, the transfer rate becomes extremely high. Adding to the history,
During ink transfer according to the present invention, 4 minus the above-mentioned 4@
The FC and FD that occur during peeling act as a resistance force for ink transfer, but because the ink is activated, they are smaller than 2 and 9 when peeling off (the sensation of a drop in ink temperature).

``!With non-contact technology, a portion of the applied thermal energy is transferred to the object to be transferred and lost, resulting in very little heat loss.

Furthermore, since thermal energy is applied before or after the application, the molten state of the ink can be maintained for a long time without unnecessarily increasing the tIAW of the ink.

Therefore, compared to the conventional contact type, less energy is applied and the transfer rate is very low.

[Embodiment] 1 FIG. 2 shows a configuration diagram of an embodiment of the present invention. A thermal head 21 was used as a thermal energy applying means, and a 26-karat gold permanent magnet was used as a magnetic attraction force generating means.

As shown in the figure, in emergency record 8#, the ink medium 22
The paper 25 and the transfer paper 25 were not in contact with each other, but were placed directly below the head, and the gap was maintained at 100 μm.

The ink medium used was a PET film 23 with a thickness of 6 μm coated uniformly with a thermoplastic magnetic ink 24 having the composition shown below to a thickness of 6 μm.

[Assembly]

1. Magnetite imitation particles 40 wt 2. Carnauba wax 20 wt %3
, paraffin wax 50 wt%4,
FiVA 5wt%5, dispersant 1wt%6, dyeing department
4wt% and melting point is 70C±
It is 5C.

Printing was performed using a permanent magnet (Sami stone) with a maximum energy product of 15 MG elstent and a thermal head with a dispersion power of 180 DPI.

Printing was performed using the circuit shown in Figure 3 (a).The pulse generator 51 generates a pulse, the inverter 32 inverts the pulse, connects it to the pace of the transistor 33, and connects the thermal head heat generating resistor 54 to the circuit shown in Figure 3 (a). b)) Applied voltage per dot as shown in 5. An OV application time of α7 m5ec was added.

The shape of the dots printed at this time had clear links9 compared to dots printed by conventional contact-type thermal transfer, and the dots as a whole were of high density and high quality. This 7″L is because this method is non-contact, so there is less heat escape and dirt.

The transfer paper used had a smoothness of 4 seconds.

[Example] 2 A record of the temperature change of the ink of Example 1 is shown in FIG. According to Koku, α1m5e after applying the applied pulse
After C, the temperature of the ink starts to rise and reaches the melting point of 7
The temperature reaches 0°C after 0.4 m5ec. Also 1,
It reaches nearly 2000 near 0m5ec.

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 when the temperature is 70°C or above.
It becomes m sec.

(This time will hereinafter be referred to as effective printing time.) The circuit shown in FIG. 5(a) was created so as to lengthen this actual effective printing time.

The pulse generated by the pulse generator 51 is transmitted to the transistor 5.
2, the pulse is amplified to vl (applied voltage 53), and the pulse generated by the pulse light generating section 54 is also amplified to v2 by the transistor 55.
56. These two pulses are applied to the two transistors 57 and 58 of the same class, and the two pulses become the M input input, and the thermal head heating section 59 is shown in FIG. 5(b).
A voltage is applied as shown in FIG.

When all printing was carried out under these conditions, a record of temperature changes as shown in FIG. 6 was obtained. This is done by applying a low voltage before the printing pulse and warming the ink to 60°C before it reaches its melting point, thereby extending the effective printing time when the applied pulse is applied. (1,7m5ec
The effective printing time within the applied pulse was 0.6 m3ec, and when printing was performed with this setting, the printing was of higher density and surface quality than in Example 1.

[Example] 3 When the low voltage application applied in Example 2 was applied after the application pulse as shown in FIG. 7, a temperature change as shown in FIG. 8 was recorded. When printing is enabled, 1 dl is 0.6, which is the same as in implementation 2.
In m5ec, all printing is done with this setting, Example 2
I was able to get the same 1L quality print.

[Example] 4 When a low voltage was applied before and after the applied pulse as shown in Figure 9 by combining Examples 2 and 3, temperature changes as shown in Figure 10 were recorded, and the effective printing time was (The printing time was 65 msec, and higher density and higher quality printing was obtained than in Example 2.3.

As long as printing can be obtained with settings other than these embodiments, any voltage of pulse 1@ may be applied to the thermal head before or after the applied pulse.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a means for applying thermal energy to a recorded portion of thermoplastic magnetic ink and a means for generating a full magnetic attraction force to the ink, and by controlling the application of thermal energy, In a printing device that transfers a recorded portion of ink to a transfer medium using magnetic attraction force, the ink and transfer medium are structured so that they do not come into contact with each other in the non-recorded portion of the ink. This eliminates the need for a peeling process and makes it possible to reduce the force that lowers the ink transfer rate in conventional techniques. This essentially solves the drawback of the conventional technology of poor printing quality on transfer paper with a very rough surface, that is, rough paper, and achieves extremely high product quality without being affected by the condition of the transfer paper. This has the effect of making printing possible.

Further, since there is no contact, a part of the applied thermal energy is not lost due to heat transfer to the transfer target, and therefore, heat loss is extremely small.

Furthermore, since thermal energy is applied before, after, or before or after the application of thermal energy, the molten state of the ink can be maintained for a long time without unnecessarily increasing the temperature of the ink.

This reduction has the effect of enabling higher quality printing with less applied energy than conventional contact type.

Furthermore, the present invention is not limited to the present example, but is effective for all printing methods in which a recorded portion of thermoplastic magnetic ink is transferred to a transferred medium by magnetism and attraction by controlling thermal energy. .

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the printing method of the present invention. FIG. 2 is a diagram showing an example of a configuration according to the present invention. FIG. 3 shows the quotient of the temperature change of the ink recorded in the thermal head in Example 1, and FIG. 4 shows the temperature change of the ink in Example 1. The fifth figure is a diagram showing the circuit and pulse voltage applied to the thermal head in the second embodiment. FIG. 6 is a diagram recording the temperature change of ink in Example 2. The seventh figure is a diagram showing pulses applied to the thermal head in the fifth embodiment. FIG. 8 is a diagram in which all changes in ink temperature in Example 5 are recorded. FIG. 49 is a diagram showing pulses applied to the thermal head in the fourth implementation row. FIG. 10 is a diagram recording the temperature change of ink when one real IM reli 4 is used. Fig. 11 is a diagram showing the various forces that act when ink medium is peeled off in a general thermal transfer method. Fig. 12 is a diagram showing the principle of a conventional printing method. 11... Application of thermal energy Means 12...Ink non-recorded portion 15...Ink recorded portion 14...Transfer medium 15...Magnetic attraction force generating means FM...Magnetic attraction vector 21...Thermal head 22...Ink Medium 23...Base film 24...Thermoplastic magnetic ink 25...Receiving paper 26...Permanent magnet 27...Printed dots Above, Ganto Ueda
Seiko Even Co., Ltd. agent Patent attorney Tsutomu Mogami Ike 1 person 〆 'Figure 1 Figure 112 (α) Application time [ecl (b) Figure 3 Figure 4 cc (α) 115 Figure 14 I7JlJ interval r? n5ec] (b) Fig. 5 Fig. 6 Fig. 7 Rabbit DDFtf [talk] Fig. 8 Dark pupil when applying 3ec] Fig. 9 Fig. 10

Claims (1)

[Claims] It has a means for applying thermal energy to a recorded portion of thermoplastic magnetic ink and a means for generating a magnetic attraction force to the ink, and by controlling the application of thermal energy, the recorded portion of the ink is transferred to a transfer medium by the magnetic attraction force. This is a printing method in which the ink and the transfer medium are not transferred in the recorded area of the ink, before or after the application of the thermal energy to print one dot. Alternatively, a printing method characterized by applying bias energy to the ink before and after.