JPS61272163A - Mist bubble ink jet - Google Patents

Abstract

PURPOSE:To realize a high quality printing without clogging by filling many tiny holes in a thin film with ink, and by closely attaching the film to a heat sensitive head, and by charging a recording medium. CONSTITUTION:If a heat generating body of the heat sensitive head 1 is applied with an electric current, a heat is generated to fly ink 3 in the bubbles 2a of the film 2 in a form of mist. However, the platen 4 is applied with voltage, at the time, and a field of static electricity is created on the recording medium 5, and the ink mist is attracted to the field to perform printing on the recording medium 5. In this case, because of a bias means 6b which is provided on the film 2, the ink mist is efficiently attracted thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing device, and particularly to a thermal inkjet printer.

[Conventional technology]

Most conventional inkjet printers form one ink droplet with one nozzle, and the nozzle is fixed. Furthermore, in the conventional mist printing method, mist is always generated and prints are formed by balancing the electrostatic field.

[Apex while the invention is trying to solve]

Conventional inkjet printers often suffer from nozzle clogging and lack reliability. Furthermore, in the mist method, there are many unstable factors in forming the balance between the charging of the mist and the electrostatic field, and good printing quality has not been obtained.

The present invention solves the above-mentioned drawbacks and provides an ink jet that can form highly reliable records with high print quality.

[Means for solving problems]

The present invention is a mist bubble inkjet characterized by filling a large number of fine holes in a thin film with ink, bringing the film into close contact with a thermal head, and providing means for injecting electric charge into a recording medium.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a conceptual diagram of a serial type printer which is an embodiment of the present invention.

At the tip of the thermal head 1, a necessary number of heating elements 1a+...
is provided. Many fine holes 2 in thin film 2
aK is filled with ink 3, and the film 2 is tightly wrapped around the thermal head 1. The conductive platen 4 is provided with means 6a for applying a voltage, and the recording medium 5 is wound around the platen 4.

On the other hand, the thin film 2 is provided with bias means 6b. In the embodiment, when a current is applied to the heating element of the heat-sensitive spatula r1, heat is generated, and the ink 3 in the many holes 2a of the film 2 is heated by the heating element, bubbles are generated, and the ink is ejected in the form of a mist. This is a fact known as the so-called Pubble Noette.

At this time, since a voltage is applied to the platen 4, an electrostatic field is generated in the recording medium 5, and the mist is attracted in that direction to form a print on the recording medium 5. In this case, since the film 2 is provided with the bias means 6b, the effect of attracting the mist is sufficiently exhibited. The thin film 2 is a thin film of several tens of microns to several hundred microns, and has many holes 2a of several tens of microns to several hundred microns in size. These holes are smaller than the heating element, and it is better to have a larger number.

The ink is filled within this space due to surface tension. This film 2 can be moved, and when the ink runs out,
You can move to the ink supply and refill it. The ink agent may be either water-based or oil-based, and its boiling point is 100°C.
~ several hundred degrees C is good. Further, since a normal thermal head is sufficient, the price can be reduced.

Corona discharge type electrostatic injection can also be used instead of a conductive platen.

〔Effect of the invention〕

In this way, the present invention can achieve high-quality printing by attracting mist-like ink droplets with an electrostatic field, and by moving a thin film, it is possible to print with a large number of small holes. This has the effect that it does not get stuck.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of a serial type printer which is an embodiment of the present invention. 1...Thermal head, 2...Thin film, 2a...
・Thin film holes, 3... ink, 4... platen, 5... recording medium

Claims (1)

[Claims] (1) A mist bubble inkjet, characterized in that a large number of fine pores in a thin film are filled with ink, the film is brought into close contact with a thermal head, and a means is provided for injecting charge into a recording medium.