JPS6135954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an ink recording head used in an electrostatic acceleration type inkjet recording system.

FIG. 1 is a perspective view mainly showing such an ink recording head, in which an upper plate 1a made of an insulating material is shown.
Above the head portion 2 consisting of the lower plate 1b,
An ink container 4 for storing ink 3 is provided,
The inside of the ink container 4 and the inside of the head section 2 are communicated with each other, so that ink 3 is constantly supplied to the inside of the head section 2.

Further, a recording paper 6 to be conveyed vertically is stretched across the ink ejection port 5 of the head section 2, and a ground conductor 7 is provided on the back side of the recording paper 6.

FIG. 2 is a perspective view seen from the ink jet port 5 side, and inside the slit-shaped ink jet port 5, there are
A plurality of recording electrodes 8 are arranged along the ejecting direction of the ink 3, the output of a driver 9 is connected to these recording electrodes 8, and high voltage pulses generated by the driver 9 are recorded according to the image signal Sv. The voltage is applied to the electrode 8.

Therefore, the recording electrode 8 and the ground conductor 7 are transferred to the ink 3 forming a meniscus to the ink jet port 5.
When an electrostatic force between the ink and the ink is applied by applying a high voltage pulse, the ink 3 is ejected from the part of the recording electrode 8 to which the high voltage pulse is applied, and this adheres to the recording paper 6, forming a dot. By continuously repeating this operation, a recorded image corresponding to the image signal Sv is formed.

Figures 3 and 4 are X-Y in Figure 2.
3 is a cross-sectional view of the recording electrodes 8a to 8.
h is provided to protrude toward the inner surface side of the lower plate 1b, and the fourth
In the figure, the recording electrodes 8a to 8h are embedded in the lower plate 1b assuming that the surfaces of the recording electrodes 8a to 8h and the inner surface of the lower plate 1b are on the same surface, but they are basically the same in operation. Yes, for example, recording electrode 8
When a pulse voltage with a wave height of 2 KV and a pulse width of 200 μsec is applied to b, the ink 3 is drawn from the position of the recording electrode 8b.
is ejected.

Note that when the above-mentioned pulse voltage is applied to the recording electrode 8b, at the same time, a peak value of 1.5 KV is applied to the recording electrode 8a.
When a pulse voltage with a pulse width of 200 μsec is applied, the ejection direction of the ink 3 from the position of the recording electrode 8b is shifted, and recording is performed at a position shifted by approximately 50 μm toward the recording electrode 8c.

Further, at the same time that the same pulse voltage is applied to the recording electrode 8c, the above-mentioned pulse voltage is applied to the recording electrode 8b.
If the voltage is applied to the recording electrode 8, the ejection direction of the ink 3 is
Recording is performed at a position shifted toward the a side and approximately 50 μm toward the same electrode 8a side.

This relationship is the same between each of the recording electrodes 8a to 8h, and a pulse voltage is applied to the recording electrode to which the ink 3 is to be ejected and the adjacent recording electrode according to the above-mentioned relationship. Therefore, the recording position is shifted due to the deviation in the ejection direction of the ink 3.

However, when the peak value of the pulse voltage applied to the adjacent recording electrode exceeds 1.5 KV, the ink 3 is also ejected from the position of the adjacent recording electrode, so in some cases, unnecessary recording may be performed. This resulted in some drawbacks.

In addition, along with the above recording electrodes 8a to 8h,
A separate control electrode is provided inside the ink ejection port 5, and the ejection of the ink 3 is also controlled by applying a pulse voltage to the control electrode. Depending on the pulse voltage conditions, ink 3 may also be ejected from the position of the control electrode, which puts restrictions on the peak value and pulse width of the pulse voltage applied to the control electrode, making it impossible to obtain sufficient ink 3. This has the disadvantage that jetting cannot be controlled.

The present invention has an object of eliminating such drawbacks of the conventional ink recording head at once, and in the above-mentioned ink recording head, the ink is arranged along the direction in which the ink is ejected to the inner surface of the ink ejection port, and the electrostatic force serving as the ejection condition is applied. A plurality of recording electrodes are selectively provided with a plurality of recording electrodes, and a plurality of recording electrodes corresponding to the recording electrodes are arranged near the inner surface of the ink jetting port and outside the recording electrodes, are insulated from the ink and the recording electrodes, and are equipped with an electrostatic force that serves as a jetting condition. a plurality of control electrodes to which an electrostatic force for shifting the direction of ejection of ink is selectively and simultaneously applied corresponding to a selected one of the recording electrodes;
An object of the present invention is to provide an extremely effective ink recording head capable of sufficiently controlling the direction of ink ejection.

The details of the present invention will be explained below with reference to FIG. 5 showing an embodiment.

FIG. 5 is a sectional view similar to FIGS. 3 and 4, and shows recording electrodes 8 protruding toward the inner surface of the lower plate 1b.
Control electrodes 11a to 11h, which are insulated from the ink 3 and the recording electrodes 8a to 8g by an insulator 10, are provided inside the lower plate 1b in correspondence with the arrangement intervals of a to 8g, and the control electrodes 11a to 11h are connected to the ink jet ports 5. For example, when a pulse voltage with a peak value of 2 KV and a pulse width of 200 μsec is selectively applied to the recording electrode 8a, correspondingly, the control electrodes 11a or When a pulse voltage having a peak value of 2 KV and a pulse width of 200 μsec is selectively applied to the control electrode 11b, the direction in which the ink 3 is ejected from the position of the recording electrode 8a is shifted toward the control electrode 11b or 11a.

Note that if the peak value of the pulse voltage applied to the control electrode 11a or 11b is increased, the amount of deviation in the ejection direction will increase;
Ink 3 does not eject from the position.

Therefore, according to the configuration shown in FIG. 5, the deviation in the ejection direction of the ink 3 can be freely controlled by changing the conditions of the pulse voltages applied to the control electrodes 11a to 11h.

In addition, the numbers of the recording electrodes 8a to 8g and the control electrodes 11a to 11h may be determined according to the recording conditions, and their shapes and attachment locations can also be arbitrarily selected, and the present invention can be modified in various ways. It is free.

As is clear from the above explanation, according to the present invention, the direction of ink jetting can be controlled by a flexible deviation amount, and unnecessary ink jetting is not performed. Great effects can be obtained as an ink recording head.

[Brief explanation of the drawing]

Fig. 1 is a perspective view mainly showing the ink recording head, Fig. 2 is a perspective view seen from the ink jetting port side, and Figs. 3 and 4 are X-Y sectional views in Fig. 2 showing a conventional example. , FIG. 5 is a sectional view similar to FIG. 4 showing an embodiment of the present invention. 2...Head portion, 3...Ink, 5...Ink ejection port, 8, 8a to 8g...Recording electrode, 9...Driver, 10...Insulator, 11a to 11h...Control electrode.

Claims (1)

[Claims] 1. In an ink recording head that has a slit-shaped ink jet orifice and applies an electrostatic force to the ink, which is a condition for ejecting the ink, to eject the ink from the ink jet orifice, to the inner surface of the ink jet orifice. a plurality of recording electrodes arranged along the ejection direction of the ink and to which an electrostatic force serving as the ejection condition is selectively applied; The ink is arranged further outward and is insulated from the ink and the recording electrode, and the electrostatic force that causes the ejection direction of the ink to shift due to the electrostatic force serving as the ejection condition corresponds to the selected one of the recording electrodes. An ink recording head characterized in that it is provided with a plurality of control electrodes that are applied selectively and simultaneously.