JPS6297865A - Printing device - Google Patents

Abstract

PURPOSE:To prevent the deterioration in the quality of a picture due to discharge abrasion and to suppress an increase in a discharge abrasion effect caused when image-receiving paper having low smoothness is used, by a construction wherein an ink film in printing is made to run in the direction of depth from the end portion of a recording head, so as to increase the closeness in contact of the head with the film in minute portions. CONSTITUTION:In a printing device comprising an ink film 25 having an electrification layer and a melting ink layer which is melted by electrification and transferred onto paper 24 to be transferred, and a recording head 22 having a needle-shaped conductor electrode 21 on one surface of a substrate and electrifying the electrification layer with the end face of the electrode 21 made to contact with this layer, the head 22 is fitted so that the film 25 in printing runs toward the depth from the end portion of the head 22. Thereby an effect of pressing the film 25 stronger on the electrode 22 is produced, the closeness in contact of the film 25 with the electrode 22 in minute portions is increased, and the generation of fine discharge is suppressed. Accordingly, discharge abrasion and the nonuniformity in the amount of electrification are reduced, and the closeness in contact of image-receiving paper with the ink film is also increased. Consequently, the deterioration in the quality of a picture is reduced even when image-receiving paper of low smoothness is used. The closeness in contact is increased further by applying a back tension in the direction reverse to the running direction simultaneously with an alteration of a course of the film 25 taken until it reaches the head 22.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to an electrically conductive thermal transfer printing device.

[Conventional technology]

As shown in FIG. 5, a conventional electrical printing device has a platen 2
A transfer paper 24 and an energizing type ink 7' irradiation 25 are wrapped around the recording paper 5, and the recording head 22 as shown in FIG. 4 is energized and printed while being driven in the direction of the arrow. 21 is a recording electrode.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, a minute discharge occurs between the recording electrode 21 and the current-carrying layer due to the energization during printing, and the shape of contact between the recording electrode 21 and the current-carrying layer changes due to discharge wear, and the printing dots change. The shape of the image also changes, making it difficult to obtain the initial image quality. In particular, the degree of progress of the discharge wear differs depending on the polarity, so if long-term printing is performed with a conventional recording head 22 in which negative voltage application electrodes and positive voltage application electrodes are alternately arranged, discharge wear of the positive voltage application electrodes progresses quickly, and the shape of contact between the recording electrode 21 and the current-carrying layer tends to be different between the negative voltage application electrode and the positive voltage application electrode. When printing with such a recording head 22, the shape of the printed dots generated under the negative voltage applying electrode and the printed dot shape generated under the positive voltage applying electrode are different, so that a pitch of twice the pixel pitch is printed on the printed image. Vertical streaks are likely to occur, resulting in a significant deterioration in the quality of the printed image.

Moreover, if a receiving paper with rough smoothness is used, not only the image quality will deteriorate rapidly, but also the contact between the recording electrode 21 and the ink film 24 will be uncertain at the microscopic level, similar to a thermal transfer printing device using a thermal head. Therefore, the abrasion effect caused by the discharge described above becomes very noticeable, and there is a problem that it is of little practical use.

The present invention has been developed to solve these problems, and its purpose is to eliminate the problem of image quality deterioration even when using rough-smooth image receiving paper, and to reduce the amount of discharge wear and maintenance required. The purpose of the present invention is to provide a free current-carrying type thermal transfer printing device.

[Failure to solve the problem]

The printing device of the present invention has a transfer paper, a current-carrying layer, and a melting ink layer, and the melting ink layer is melted by Joule heat generated by passing a current through the current-carrying layer, and is transferred onto the transfer paper. In a printing device comprising an ink film for recording, and a recording head having a needle-shaped conductive electrode on one side of a substrate and energizing the conductive electrode by contacting the end face of the conductive electrode with the current-carrying layer, the ink film is placed at the end of the recording head. It is characterized by printing while moving from the section to the back.

[Effect]

According to the above configuration of the present invention, depending on the running direction of the ink film during printing, the effect of pressing the ink film more strongly against the recording electrode is produced.

Therefore, the adhesion between the ink film and the recording electrode at a minute portion is greatly improved, and the chance of a minute discharge occurring becomes extremely small.

Therefore, discharge wear is significantly reduced.

On the other hand, due to the above-mentioned reasons, the variation in the amount of current applied is reduced, and the adhesion between the image receiving paper and the ink film is also improved, so even if receiving paper with rough smoothness is used, the amount of heat generated is stable and the transferability is improved. Since the image quality is improved, deterioration in image quality is reduced.

〔Example〕

FIG. 1 is a block diagram of an embodiment of the present invention, and shows the sixth embodiment of the present invention.
The difference from the conventional example shown in the figure is that the mounting direction of the recording head 22 is opposite to the running direction of the ink film 25 compared to the conventional example.

Therefore, during printing, the ink film 25 runs inward from the end of the recording head 22.

Next, Figure @2 shows another embodiment of the present invention, in which the recording head is installed in the opposite direction to the conventional example, and the ink film 25 is By changing the path to reach the head 22, the recording head 2
At the same time as making it easier to bring the ink film 25 into close contact with the
Back tension is applied in a direction opposite to the running direction of the ink film 25 to further enhance adhesion.

Therefore, the running path of the ink film 25 bends toward the recording head 22 around the tangent between the recording head 22 and the ink film 25, and the angle becomes smaller than 1800 degrees.

〔Effect of the invention〕

As described above, according to the present invention, by further improving the adhesion between the recording head 22 and the ink film 25, image quality deterioration due to discharge wear and image quality deterioration when using image receiving paper with rough smoothness can be avoided. The effect of suppressing the remarkable increase in the discharge wear effect to a large extent was obtained.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing another embodiment of the present invention. FIG. 5 is a diagram showing a conventional current-carrying type thermal transfer printing device. FIG. 4 is a diagram showing the configuration of the recording head 22. 21...Recording electrode 22...recording head 23...Platen 24... Transfer paper 25... Ink film that's all

Claims (1)

[Scope of Claims] 1) A transfer paper having a current-carrying layer and a melting ink layer, the melting ink layer being melted by Joule heat generated by passing a current through the current-carrying layer and being transferred to the transfer paper. In a printing device comprising an ink film for recording, and a recording head having a needle-shaped conductive electrode on one side of a substrate, the end surface of the conductive electrode is brought into contact with the current-carrying layer and energized. A printing device characterized in that it prints while traveling toward the back of the room. 2) The running path of the ink film is such that the recording head is in contact with the recording head with respect to the surface direction formed by the tangent to the ink film and the ink film surface immediately after recording by the recording head. A patent characterized in that the angle formed by the ink film surface immediately before the recording head is less than 180 degrees with the tip of the recording head as the center, and further comprising a film path regulating section that applies tension to the ink film in a direction opposite to the running direction. A printing device according to claim 1.