JPS58153660A - Ink recording head - Google Patents

Abstract

PURPOSE:To obtain the titled head, wherein an upper plate constituting a slit shaped opening is formed by a material whose contact angle with ink is large, the wetting of the upper surface of the end surface or the upper plate by the ink becomes little, and the ink jetting characteristic is stabilized. CONSTITUTION:The upper plate 2a is formed by the material, whose contact angle with the ink 8 is 10 degrees or more. The ink 8 does not wet the upper surface 2a of the upper plate 2a when the static pressure at an ink jetting port 1 is 30mm. Ag or less. Thus the stable ink jetting characteristic is obtained. It is recommended that the material of the upper plate 2a is made of fluororesin and the like which are hard to be wetted and a mold releasing agent and the like whose main component is silicone oil is applied on the upper surface of the upper plate 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink recording head capable of electronic plane scanning.

There are various existing recording methods such as electrostatic recording method, thermal recording method, electric discharge destruction recording method, and electrophotographic method, but all of these methods use special recording paper. : There are problems with the 1st stroke, the complexity of the horizontal structure of the markings, and the lifespan of the markings.

For this reason, recently, an inkjet recording system that allows direct recording on plain paper has been attracting attention. This method involves ejecting ink accelerated by an electric field from a nozzle that is supplied with ink onto the surface of a marking body that moves relative to the tip of the nozzle while maintaining a constant distance from the tip of the nozzle. It is used for recording brass, and has various advantages such as low pressure, no noise, and long recording life.

Therefore, the present applicant has developed a silver recording system that enables electronic plane scanning by using an elongated slit-shaped ink ejection port with a large number of electrodes in place of the nozzle used in the conventional inkjet recording system. Proposed.

1II is a perspective view of the configuration of the solid silver method, in which 1 is an ink jet nozzle s2am2b formed in a slit shape, an upper plate and a lower plate consisting of a flat plate forming this ink jet nozzle 1, and 3 is a period of this lower plate 2bJcK. 4 is a ground conductor placed opposite the ink jet port IK;
is a recording paper that moves along this ground conductor 4, and 6 is a driving power source that supplies a selected voltage of 11 Km to the electrode 3.

Note that T is an image signal, and this image signal 1 is a driving voltage l1lsK.
It is configured to control the driving power.

In the recording method configured in this way, when ink is injected into the ink jetting port 1 and driving power and higher voltage are supplied to one or more selected electrodes of the electrodes 3, the selected electrode and the slit are The electrode outside the opening, that is, the ground conductor 4
The electrostatic force generated between them draws the ink out through the slit-shaped opening and records it. That is, ink near one selected electrode is ejected from the ink ejection port 1, and adheres to the recording paper S, thereby performing recording.

Here, since the ground conductor 4 is provided with an ink passage port, it is also possible to arrange the ground conductor 4 between the ink jet port 1 and the recording paper S. Further, it goes without saying that the potential of the ground conductor 4 does not necessarily have to be the ground potential, and can be set arbitrarily as long as it is within a range that can form an electric field necessary for ejecting ink.

However, in this 5-day kamagata 2, the upper board 2
There was a problem in that when the top surface of No. 1 got wet with ink, the ink ejection characteristics deteriorated.

In order to eliminate this problem, the present invention consists of an upper plate made of a material having a large contact angle with respect to ink, and the purpose of this is to make the upper plate less wetted between the ink and the ink. Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 2 is a sectional view of essential parts showing an embodiment of the present invention. The upper plate 2 & is made of a material having a contact angle with the ink S of 10 degrees or more. In this configuration, when the ink static pressure at the ink ejection port 1 was 30 mmq or less, the interlayer did not wet the upper surface of the upper plate 2a, and stable ink ejection characteristics were exhibited.

To explain the contact angle using Fig. 3,
゛When the ink 6 is wet on the upper plate 21, the angle θ shown in the figure
is the contact angle.

Moreover, FIG. 4 is a cross-sectional view showing most other embodiments. The width of the end surface 2a' of the upper plate 2a facing the ink jetting port 1 is sufficiently larger than the width 1' of the ink jetting port 10. Conventionally, the upper 4 [
It was thought that the width of the end face 1a' of 2a should be made small, but even in a configuration where the end face 2m' is wide as in No. 411, the ink static pressure of one inch of the ink jet port is 30 μA.
When q or less.

Ink-black exhibited stable ink ejection characteristics without wetting the end face facing the ink ejection port 1 of the upper plate 2a.

'Increasing the contact angle with ink IIK (10 degrees or more) can be achieved by using a wet moldy material such as fluororesin as the material of the upper slope 2a. In addition, as another method, use a detergent containing silicone oil as the main component.
This can also be achieved by applying WK on top of 2a.

As explained above, according to the present invention, the upper flat plate constituting the slit-shaped opening is made of a material having a large contact angle with ink, so that the dirt floor or end surface of the upper flat plate does not get wet with ink. This has the advantage of stabilizing the ink jetting characteristics and improving the quality of recorded master images.

[Brief explanation of drawings]

Fig. 1 is a structural perspective view showing an example of an inkjet recording system capable of electronic scanning, Fig. 2wA is a sectional view of essential parts showing an embodiment of the placement head according to the present invention, and Fig. 3 is an explanation of the contact angle. Figure 4111 is a cross-sectional view of a main part showing another embodiment of the invention. In the figure, 1 is an ink jet nozzle s2**2b is an upper plate and a lower plate forming an ink jet nozzle, 3 is an electrode, 4 is a ground conductor, S
is the recording paper, . is the driving power source, T is the image signal, and S is the ink. Procedural amendment (spontaneous) July 19, 1981 Mr. Commissioner of the Japan Patent Office 1, Indication of the case Petition No. 1857-46!1l17 No. 2,
Title of the invention Ink recording head for sickle 3, Relationship to the case of the person making the amendment Patent applicant address 1-1-6-5 Uchisaiwai-cho, Chiyoda-ku, Tokyo, Detailed description of the invention in the specification subject to amendment and drawings 6. Contents of correction (1) Ij! On page 4 of the specification, lines 18-20, [The explanation is...] ” should be corrected as follows. "Explain. When the top surface of the forest member is wet with ink @ ÷, the angle θ shown is the contact angle between the forest member and the ink." (I) Correct Figure 3 as shown in the attached sheet. that's all

Claims (1)

[Claims] When ink is held in an elongated slit-shaped opening having a large number of electrodes on the inner wall and a high voltage is applied to a selected electrode among the large number of electrodes, the recording head selects the ink and draws it out to the outside for recording. An ink recording head characterized in that the slit-shaped opening is composed of two flat plates arranged horizontally, and the flat plate arranged above is made of a material having a large contact angle with respect to ink.