JPH02225052A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To enable reduction of driving voltage, simplification of a structure, increase of stability of ink discharge, etc. to be performed by a method wherein a first and a second electrodes of which distances from a nozzle are different and of which one electrode is arranged at a position dislocated from a nozzle extension line, are arranged between the nozzle and recording paper. CONSTITUTION:When a signal voltage 8 is applied between ink in an ink nozzle 1 and a first electrode 3, the ink 6 is elongated from the nozzle 1 to fly stringily in the electrode 3 direction. Then, a signal voltage 9 is applied between the ink and a second electrode 4. Since a phase of the signal voltage 8 is slightly delayed for that of the signal voltage 9, the stringy ink 6 having flown in the first electrode 3 direction flies in the second electrode 4 direction by making its direction slightly bend before colliding against the first electrode 3. Recording paper 7 is arranged behind the second electrode 4, and the ink 6 is influenced from the signal voltage 8 applied to the first electrode 3. The ink 6 is stuck to the back recording paper 7 without colliding against the second electrode 4 and is recoded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an inkjet recording apparatus that ejects ink to record characters and figures on a recording material.

BACKGROUND OF THE INVENTION Recently, the demand for color hard copies has increased with the development and spread of computers.

An inkjet recording method is one of the effective recording methods for this purpose. This inkjet recording method is
It is superior in terms of high-quality color recording, low noise, and low running costs, and there are many different methods. One of these is an inkjet that uses electrostatic suction. Regarding this inkjet recording method, for example, JP-A-58
-208062 publication or JP-A-56-4467
The configuration described in the publication is known. Below, the second
A conventional electrostatic attraction type inkjet head will be explained with reference to the drawings and FIG.

FIG. 2 was described in Japanese Unexamined Patent Publication No. 58-208062. The head structure is shown. An orifice 40 formed in the electrode 30 is arranged opposite to the nozzle 10 formed in the head component 20. and an electrode 30.

By applying a signal voltage 80 between the ink 60 existing in the chamber communicating with the nozzle 10, the ink is drawn out from the nozzle 10, passes through the orifice 40, and is deposited on the recording paper 70 on the front side, thereby recording. It is something that allows people to do this.

On the other hand, FIG. 3 shows a simplified structure of the head described in Japanese Unexamined Patent Publication No. 56-4467.

A slit-shaped nozzle 11 is formed in the head component 21, and a first electrode 31 is disposed inside the nozzle 11.
The electrode 32 is arranged on the back side of the recording paper. In this configuration, a signal voltage 81 is applied between the first and second electrodes 31,32.
is applied, the ink in the slit-shaped nozzle 11 is stretched and ejected from the tip of the first electrode 31, and the recording paper 7 is
1 to perform recording.

Problems to be Solved by the Invention However, the above configuration has several problems. That is, since the head shown in FIG. 2 has an ink nozzle 10 and an orifice 40 opened to the electrode 30, processing and alignment thereof are difficult, which poses an assembly problem. In addition, in this configuration, if the flying ink accidentally adheres to the inside of the electrode 30, the state of the electric field will change, the flying direction of the ink will change, and the ejection amount will vary. . If the degree of the problem progresses further, the electrode 30 will not be able to pass through the orifice 40.
There is a risk of collision. Furthermore, with this configuration, it is not easy to increase the density of the nozzles.

On the other hand, in the head shown in FIG. 3, the above problem is solved, but since the electrode 32 is installed on the back side of the recording paper 71, the driving voltage is extremely high, 2kvtl higher. Have new problems.

The present invention solves each of the problems shown in Figs. 2 and 3, and is an electrostatic suction type inkjet head that is excellent in low voltage, high nozzle density, and stable ejection. The purpose is to provide an inkjet recording device.

Means for Solving the Problems In the present invention, first and second electrodes are provided between the nozzle and the recording paper at different distances from the nozzle, and at least one of them is located off the nozzle extension line. This configuration achieves the above object.

Effect of the present invention With the above configuration, a signal voltage Do is applied to the first electrode and the ink in the nozzle, the ink is stretched and ejected in the direction of the first electrode, and then the ink is connected to the second electrode. By applying a signal voltage between the two electrodes, the ink flying in the direction of the first electrode is caused to fly in the direction of the second electrode, and is deposited on the recording paper behind the second electrode to perform recording. be.

EXAMPLE μ Below, an example of the present invention will be described with reference to the drawings. FIG. 1 shows a head of an inkjet recording apparatus according to an embodiment of the present invention. FIG. 3 is a simplified cross-sectional view with the center as the center. In FIG. 1, l denotes an ink nozzle communicating with an ink reservoir (not shown), which has a rectangular cross section, and its negative side is approximately 100 μm. The ink nozzle component 2 that constitutes the ink nozzle 1 is made of an insulator.

A part of the upper side of the nozzle 1 is extended, and a first electrode 3 is provided at the tip thereof. A platen 13 that supports the recording paper 7 is arranged at a predetermined distance from the nozzle member 2, and an electrode arrangement member 5 is provided between the platen 13 and the recording paper 7fjr so as to sandwich the recording paper 7. Hold down the float. 4 is a second electrode, and the nozzle component 2 is:
Independently provided at the tip of the electrode arrangement member 5, the nozzle 1
The first electrode 3 is disposed on or below the extension line of the nozzle 1, and is further away from the nozzle 1 than the first electrode 3. 8 and 9 are signal voltages.

Next, the operation of the above embodiment will be explained. Now, when the signal voltage 8 is applied between the ink in the ink nozzle 1 and the first electrode 3, the ink 6 is stretched from the nozzle 1 and flies in the direction of the first electrode 3 in the form of a thread. A signal voltage 9 is then applied between the ink and the second electrode 4. Signal voltage 9 is slightly delayed in phase from signal voltage 80.

As a result, the thread-like ink 6 flying toward the first electrode 3 changes direction before colliding with the first electrode 3.
It is slightly bent and flies toward the second electrode 4. A recording paper 7 is arranged behind the second electrode 4, and the ink 6 is influenced by the signal voltage 8 applied to the first electrode 3, so that it does not collide with the second electrode 4. , adheres to the recording paper 7 behind and is recorded. Since the recording paper 7 is fed upward, the recorded state will not be rubbed or deteriorated.

Even if the time relationship of signal voltages 8 and 9 is reversed and the signal voltage 90 phase is made slightly earlier than the signal voltage 80 phase, the ink trajectory is only slightly distorted and the signals are recorded at the same point on the recording paper 7. The voltage value of the melt signal voltage 8.9 is from the tip of the nozzle 1 to the first.
Although it varies depending on the distance to the second electrodes 3 and 4, the shape of the electrodes, the shape of the nozzle 1, the physical properties of the ink, the delay time, etc., it is possible to use a voltage as low as several hundreds of volts. In addition, the simple structure of the head makes it easy to use multiple nozzles.
Variations in ejection characteristics between the nozzles can be easily corrected by electrical correction.

Further, it is desirable to use an oil-based ink having a specific resistance of 10 6 to 10 8 gcma degrees.

Note that the first electrode 3 and the second electrode 4 are located at different distances from the ink nozzle 1 between the ink nozzle l and the recording paper 7, and at least one of them is deviated from the ejection opening extension line of the ink nozzle 1. It does not matter whether it is integrated with the nozzle component 2 or separate from the nozzle component 2. Further, the electrode arrangement member 5 provided with the 20th polarization 4 may be provided independently without also serving as a presser for the recording paper 7.

According to the present embodiment, the first and second electrodes are arranged between the ink nozzle and the recording paper at different distances from the nozzle. By providing this, the structure of the head can be simplified and stable recording can be performed with a low driving voltage. In addition, correction of ejection characteristics in the case of multi-nozzle configuration can be easily performed electrically.

Effects of the Invention As described above, the present invention makes it possible to reduce the driving voltage, simplify the structure, increase the stability of ink ejection, and facilitate correction of ink ejection between nozzles in an electrostatic suction type inkjet head. It is something to do.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an inkjet recording apparatus showing an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of conventional electrostatic attraction type inkjet recording apparatuses. DESCRIPTION OF SYMBOLS 1... Nozzle, 2... Nozzle component, 3... First electrode, 4... Second electrode, 5... Electrode arrangement member, 6... Ink, 7... Recording Paper, 8, 9...signal voltage, 13...platen. Figure 1 Name of agent Patent attorney Shigetaka Awano and 1 other person Figure 1

Claims (3)

[Claims] (1) First and second electrodes are provided between the ink ejection port communicating with the ink reservoir and the recording material, at different distances from the ejection port, and at least one of which is located off the extension line of the ejection port. is provided, and a signal voltage with a slight time lag is applied between the ink in the ejection port and the first and second electrodes, and the ink is stretched from the ejection port in the direction of the two electrodes. and made to fly;
An inkjet recording apparatus characterized in that recording is performed by depositing ink on the recording object. (2) The inkjet recording apparatus according to claim 1, wherein the signal voltage is applied earlier to the electrode closer to the ink ejection port. (3) The inkjet recording apparatus according to claim 1, wherein the signal voltage is applied quickly to the electrode farther from the ink ejection port.