JPS58102781A - Magnetic ink recording head - Google Patents

Abstract

PURPOSE:To obtain the magnetic ink recording head, which easily supplies magnetic ink and characteristics of discharge therefrom are stable, by winding an insulator wire between magnetic stylus electrodes integrally mounted to a base at regular-interval pitches and forming an ink groove. CONSTITUTION:An insulator wire material 17 is wound among magnetic stylus electrodes 16 integrally molded and mounted to a base 15 at regular-interval pitches, a ink groove 14 is formed, and a recording head 10 is formed. Magnetic ink 24 is supplied to an ink chamber 20 through a pipe 22 from a tank 23, reaches the ink groove 14 through an ink holding member 21 consisting of a porous body, reaches a nose section 18 by capillarity, and is held by the magnetic force of the magnetic stylus electrodes 16 magnetized by a permanent magnet 13, and a projecting meniscus is formed. When bias voltage is applied between each of the electrodes 16 and an opposite electrode 12 by means of a power supply 27 while pulse voltage corresponding to picture signals is applied to the electrodes 16 through a picture-signal voltage applying means 26 at the time, magnetic ink files to a recording surface 11 from the nose section 18 and adheres to the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording head in an image recording apparatus that obtains an image by ejecting and flying magnetic ink onto a recording surface from before the ink in response to an image signal.

It is an object of the present invention to provide a magnetic ink recording head that allows easy supply of magnetic ink, provides good and stable ejection characteristics of the magnetic ink, and has a simple configuration and is easy to process.

Conventionally, the inkjet recording method has been adopted in various recording apparatuses because the noise during recording is extremely low, and since plain paper can be used, the running cost is low. In addition, in recent years, with the demand for faster and higher recording density, magnetic needle electrodes have been installed at the bottom of the ink grooves 2 on the substrate 1 as shown in FIGS. 1 and 2. 3 is magnetized by a magnet 4, and a third magnet is attached to the tip of the magnetic needle electrode 3.
Form a meniscus of magnetic ink 5 as shown in the figure,
A recording head has already been proposed that records an image using a configuration in which magnetic ink 5 is ejected from the meniscus onto the recording surface 6.

However, in the recording head described above, the magnetic ink 5 filling the ink chamber 7 is supplied through the capillary tube of the ink groove 2, and a meniscus as shown in FIGS. 3a and 3b is formed at the tip of the ink γ 42. Therefore, it was necessary to make the ink sluice 2 with particular precision. Therefore, in the past, the front of the ink was processed by cutting grooves with a cutting tool or molding on a substrate made of an insulator such as glass or plastic. lol
It is difficult to form the ink grooves over a wide width with high precision at a density of . Further, since ink consumption increases with high-speed recording, it is necessary to increase the depth of the ink grooves 2, but increasing the depth of the ink grooves 2 is more difficult in terms of processing.

The present invention will be described as providing a magnetic ink recording head that solves the above-mentioned drawbacks, is capable of high-density, high-speed recording, has a simple structure, and is easy to process.

FIGS. 4 and 5 show an embodiment of the present invention, and show a recording head section using magnetic ink and a recording apparatus. The recording head 10 includes a base 15 which is disposed facing the recording paper surface 11 and is provided with a plurality of ink grooves 14, and a needle-like electrode 16 made of a magnetic material and whose tip is exposed into the ink groove 14. It consists of

The acicular electrodes 16 are integrally molded on the base 15 using plastic or the like while maintaining equal pitches (for example, intervals of 125 to 100 μm when the recording density is 8 to 10 lines/m). The ink a14 is composed of an insulating wire material 11 made of nylon or the like wound around the base 15 so as to be located between the needle electrodes 16.

At this time, the tip of the magnetic needle electrode 16 is in a state of protruding slightly (approximately 20 to 30 μm) into the ink groove 14 .

It becomes. This is possible by sandblasting the tip end 18 of the substrate 16 integrally molded with the magnetic needle electrode 14 from the direction indicated by the arrow. Figures 6 and 7
As shown in the figure, the magnetic needle electrodes 16 are exposed on the base after sandblasting, and there are recesses 1 between the magnetic needle electrodes.
9 is formed, and if the wire material 17 is wound using this recess 19 as a guide, the ink groove 1 as described above is formed.
The magnetic needle electrode 16 can be configured to slightly protrude into the inside of the magnetic needle 4 .

Furthermore, since the wire material 17 is wound using the curved portion 19 as a guide, not only is the wire material 17 easily wound, but the ink grooves 14 can be formed with high accuracy.

The magnetic needle electrode 16 is magnetized by a permanent magnet (an electromagnet or the like may be used) 13 disposed near a counter electrode 12 provided behind the recording surface 11.

In this embodiment, the magnet for magnetizing the magnetic needle electrode 16 is provided near the counter electrode, but its position is not limited as long as it is an optimal position for magnetizing the magnetic needle electrode 16.

As shown in FIGS. 4 and 5, the ink supply section is composed of an ink supply chamber 2o and an ink holding member 21 made of a fibrous material such as thread or sponge, or a porous material provided on the ink groove 14. ing.

The magnetic ink supply pipe 22 supplies magnetic ink 24 from the ink tank 23 to the ink supply chamber 2o.

Further, the pump 25 supplies magnetic ink 24 to the ink tank 23 from a main tank (not shown).

The magnetic needle electrode 16 is connected to an image signal voltage applying means 26 for ejecting and flying the magnetic ink 24 in the ink groove 14 onto the recording paper surface 11 in response to an image signal, and also connected to the opposing electrode 12. A bias voltage is applied by a power source 27 during this period.

Hereinafter, in this embodiment, magnetic ink 2 is applied to the recording paper surface 11.
The recording operation of recording an image by ejecting and flying magnetic ink 24 and the accompanying flow of the magnetic ink 24 will be described. still,
Arrows in the figure indicate the flow of the magnetic ink 24.

In FIGS. 4 and 5, magnetic ink 24 is supplied from the ink tank 23 through the ink supply vibrator 22 into the ζ ink chamber 2o. (At this time, the liquid level of the ink tank 23 may be maintained at a constant level, or the ink chamber 20 may be set to have an appropriately low pressure applied thereto.) The magnetic ink 24 filling the ink chamber 2o is removed from the porous material. The ink is supplied to the ink groove 14 of the erroneous recording head 10 through the ink holding member 2h. The magnetic ink 24 supplied to the ink groove 14 is
The ink is supplied to the tip 18 of the ink groove 14 by the capillary action of No. 4, and at the same time is held by the magnetic force of the magnetized magnetic needle electrode 16, forming a raised meniscus as shown in FIG.

In a state where the raised meniscus as described above is formed, a bias voltage is applied between the magnetic needle electrode 16 and the counter electrode 12 by the power supply 27, and a pulse voltage corresponding to the image signal is applied to the magnetic field by the image signal voltage applying means 26. When applied to the needle electrode 16, magnetic ink 2 is drawn from the tip 18 of the ink groove 14.
4 flies.

The flying magnetic ink droplets adhere to the recording surface 11 and form a desired image, and as the magnetic ink 24 is consumed by image formation, the magnetic ink droplets pass from the ink tank 23 through the ink groove 14 to the tip 18 of the ink groove 14. Ink 24 is supplied.

According to this embodiment, the ink grooves of the recording head are constructed by winding an insulating wire between the magnetic needle electrodes provided integrally with the base at equal pitches, so that the ink grooves of the recording head can be A head capable of high-density recording can be made easily and easily without the need for high-precision, minute groove machining.

By winding an insulated wire around the base, ink supply grooves are formed on both sides of the magnetic needle electrode, making it possible to supply sufficient ink even when ink is consumed during high-speed recording. be.

According to this embodiment, the magnetic ink is supplied from both sides of the magnetic needle electrode, and the magnetic needle electrode is configured to protrude slightly into the ink groove, thereby forming a conical meniscus that is optimal for flight. Good and stable ejection characteristics can be obtained. Therefore, with the improvement in the flying characteristics of magnetic ink, it is possible to obtain recorded images of good quality even during image recording.

As described above, according to the present invention, good and stable ejection characteristics of magnetic ink can be obtained, and the structure is simple and easy to process.
A magnetic ink recording head capable of high-speed, high-density recording can be provided.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a recording head of a conventional magnetic ink recording device, Fig. 2 is a side sectional view showing the schematic structure of the same device, Fig. 3a is a sectional view of a protruding meniscus of the same head, and Fig. 3a is a sectional view of a protruding meniscus of the same head. 4 is an exploded perspective view of the recording head of a magnetic ink recording device according to an embodiment of the present invention. FIG. 6 is a schematic configuration diagram of the device. FIG. 7 is an explanatory diagram showing the state of the tip end of the recording head, and FIG. 8 is an explanatory diagram showing the raised meniscus state of the recording head. 1.5...Head base, 16...Magnetic needle electrode, 14...Ink groove, 17...Insulator wire, 24...--- Magnetic ink, 21...
...Ink supply member. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Figure 12 Figure 3 Figure 14 Figure 8 Figure 6 8

Claims (1)

[Scope of Claims] A plurality of ink plates formed by winding insulating wires at regular intervals on the surface of a non-magnetic base. A supply unit that supplies magnetic ink before the ink, a needle-like electrode made of a magnetic material with at least its tip peeking into the ink groove, and a magnet arranged near the needle-like electrode. B. A magnetic ink recording head, characterized in that a raised meniscus array of magnetic ink is formed on the magnetic needle electrode.