JPS638909B2 - - Google Patents

Description

Detailed Description of the Invention The present invention is a magnetic stylus made of a magnetic material, which is magnetized, magnetic ink is raised at the tip of the stylus, and a voltage corresponding to an image signal is applied, and the magnetic ink is ejected by a coroner to perform recording. The present invention relates to an ink recording device, and aims to provide a magnetic ink recording device in which magnetic ink is less likely to cause noise to fly from a portion other than the tip of a stylus.

Magnetic ink is raised on the tip of the stylus using a plurality of raised magnets, and a voltage corresponding to the image signal is applied to cause the magnetic ink to fly with a Coulomb force.
A magnetic ink recording device for recording was granted a patent application in 1982.
Already proposed by No. 180715. An outline of this device will be explained using FIGS. 1 and 2.

In the figure, a stylus 1 is made of a magnetic material and is regularly arranged in a base 2. 3 is a first bump magnet which is glued onto the stylus.
Reference numeral 4 denotes a second uplift magnet, which is arranged with a certain slit-like opening in common with the first uplift magnet. The first uplift magnet 3 and the uplift magnet 4
As a result, the stylus 1 is magnetized. As shown in FIG. 2, the protruding magnets 3 and 4 are configured to concentrate lines of magnetic force at the slit-shaped opening and exert a holding force on the magnetic ink 5. 6 is a pipe, 7 is a supply pump, and 8 is a magnetic ink tank.

The magnetic ink 5 is first supplied by the pump 7 and then supplied to the head section 9. When the magnetic ink 5 is supplied to the head portion 9 and the supply path up to the slit-shaped opening is filled with the magnetic ink 5, a holding force acts at the slit-shaped opening as described above, and the liquid level of the ink tank 8 is They are balanced with a head difference H between them. In this state, the magnetic ink 5 is supplied from the slit-like opening to the tip of the stylus 1 through the slope of the first bump magnet 3. The pump 7 is stopped when the head portion 9 is filled with the magnetic ink 5. Even when the pump 7 is stopped, the pump 7 is constituted by a pump such as an axial flow pump through which the magnetic ink 5 can freely pass,
The magnetic ink 5 consumed by the flying is automatically supplied to the tip of the stylus 1.

A gate electrode 10 has a curved surface with a radius R at a position facing the stylus 1, and a voltage is applied between it and the stylus 1 by a voltage applying means 11 that applies a voltage corresponding to an image signal. The magnetic ink 5 raised on the stylus 1 is given a coulomb and is caused to fly onto the recording paper 12 to perform recording.

In the magnetic ink recording device as described above, the second protruding magnet 4 has an angle θ at the end in order to strengthen the magnetic ink retention force in the slit-shaped opening.
It consists of 90°. This angle θ has a large relationship with the magnetic ink retention force in the slit-shaped opening, as shown in FIG. If the angle θ is increased, the holding force is increased, and even if the head H is increased, the magnetic ink 5 can be held. When the head height H is increased, it becomes easier to obtain an appropriate protrusion at the tip of the stylus 1, and the shape of the protrusion becomes less susceptible to changes in the head height H, making it possible to widen the allowable range of the head height H for flight recording. can. Therefore, it becomes easier to stably obtain high print quality.

Further, as shown in FIG. 4, the relationship between the thickness t of the second bump magnet 4 and the magnetic ink holding force of the slit-shaped opening can be made stronger as the thickness t becomes thicker.

As shown in FIG. 2, the state of magnetic ink adhering to the tip of the head portion 9 is bulged at the tip of the stylus 1 and also at the tip of the second bumping magnet 4 on the opposite side to the slit-shaped opening. A bump forms.
The electric charge applied to the stylus 1 is induced and charged in this part, and the recording surface 1 is charged almost at regular intervals.
2, and this turned into flying noise and degraded print quality. For this reason, there is a limit to increasing the thickness t of the second bump magnet 4, and high quality cannot be obtained. Also, the recording paper 1
As shown in FIG.
The distance between the head part 9 is small at 0.05 to 1 mm.
If they are installed out of alignment, it becomes difficult to maintain uniform spacing in the longitudinal direction, making it difficult to obtain high print quality.

As described above, conventional magnetic ink recording devices have had problems in obtaining high print quality.

The present invention aims to solve this problem and provide a magnetic ink recording device that can obtain high print quality.

A magnetic ink recording apparatus which is an embodiment of the present invention will be described in detail with reference to FIGS. 1, 6 and 7.

The explanation of the device is the same as that of the conventional example and is as shown in FIG.

FIG. 6 is an enlarged view of the main part of the head of a recording apparatus according to an embodiment of the present invention.

The numbers are the same as in the conventional example.
Styluses 1 are made of a magnetic material and are regularly arranged on a base 2. Further, the stylus 1 has a radius R between the tip of the stylus 1 and the gate electrode 10.
It is constructed so that it is almost parallel to the extension of the straight line connecting the center of Reference numeral 3 denotes a first bump magnet, which is placed on the stylus 1 and forms a magnetic pole as shown in the figure. A shield plate 13 made of a magnetic material is attached to the magnetic pole face opposite to the stylus. Reference numeral 4 denotes a second uplift magnet, which is arranged so as to form a slit-like opening 14 with the first uplift magnet 3, forming a magnetic pole as shown in the figure. Further, a shield plate 15 made of a magnetic material is attached to the surface on the slit-shaped opening 14 side, and the shield plate 1 of the first bump magnet 3 is attached.
3 to form a slit-shaped opening 14, and the lines of magnetic force of both magnets are concentrated in the slit-shaped opening 14 to provide a holding force to the magnetic ink 5.
Further, the angle θ of the end of the second bump magnet 4 is an acute angle, and the angle θ ₂ with respect to the stylus 1 is approximately 60° to 90°.

Here, if the angle θ ₂ is too small, the angle θ
becomes smaller, and it becomes necessary to make the thickness t of the second bump magnet very thick. The angle θ ₂ is
An angle of 60° to 90° can provide a sufficient noise prevention effect, and the thickness t does not need to be extremely thick and is appropriate.

Here, if θ is made smaller than 90, the magnetic ink retention force in the slit opening 14 becomes smaller as shown in FIG.
As shown in the figure, the holding force is increased.

Further, the gate electrode 10 is configured to have a radius R at a position facing the stylus 1.

With the above configuration, the distance between the surface of the second uplift magnet facing the gate electrode 10 and the recording paper 12 can be made sufficiently longer than the distance between the tip of the stylus and the recording paper. can.

Therefore, as shown in the conventional example, even if an electric charge is induced from the stylus 1 to the protrusion formed at the tip opposite to the slit-like opening of the second protrusion magnet 4, it will not fly to the recording paper 12. This prevents noise from flying around.

With this configuration, the radius of the recording paper feeding surface can be increased, and the gap between the recording paper and the tip of the stylus can be reduced in the longitudinal direction due to errors during installation, resulting in high printing quality. can do.

Fig. 7 shows a different shape of the second uplift magnet, which is composed of two magnets, each of which constitutes a magnet as shown in the figure. The same effects can be obtained.

In this way, the gate electrode 10 of the second bump magnet
The angle θ ₂ formed by the surface facing the stylus array surface and the stylus array surface is
By setting the angle to 60° to 90°, it is possible to eliminate noise flying from the second bump magnet. Furthermore, by increasing the thickness of the second protruding magnet, the holding force of the slit-shaped opening can be increased, and stable flight characteristics can be obtained. Furthermore, there is no need to reduce the radius of the gate electrode surface (paper feeding surface), and the distance between the stylus and the gate electrode (recording paper recording surface) in the longitudinal direction when installing the head can be easily maintained constant, allowing printing in the longitudinal direction of the head. Quality can also be kept constant.

As described above, according to the present invention, high-quality images with less flying noise can be easily obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a conventional magnetic ink recording device, FIG. 2 is a side sectional view of the magnetic ink head portion of the same device, and FIG. FIG. 4 is a characteristic diagram showing the relationship between the θ of the uplifting magnet, and FIG. 4 is a characteristic diagram showing the relationship between the thickness and holding force of the second uplifting magnet of the device.
The figure is a side cross-sectional view of the same device when the radius of the recording paper feeding surface is reduced, FIG. 6 is a side cross-sectional view of the main part of a magnetic ink recording device which is an embodiment of the present invention, and FIG. 7 is a side cross-sectional view of another embodiment. FIG. 3 is a side cross-sectional view of the main part of the head, showing an example. 1... Stylus, 3... First bump magnet,
4...Second bump magnet, 5...Magnetic ink, 1
4...Slit-shaped opening, 13, 15...Shield plate, _θ2 ...Angle formed by the stylus array surface and the tip surface of the second bump magnet.

Claims (1)

[Claims] 1 a multi-stylus made of a magnetic material; a first protrusion magnet that is provided in contact with the vicinity of the tip of the multi-stylus and extends in the stylus arrangement direction and magnetizes the multi-stylus; and the first protrusion magnet. a second protruding magnet arranged to form a predetermined slit-shaped opening with the magnet, and a magnetic ink supply means for supplying magnetic ink to the tip of the stylus through the slit-shaped opening. a gate electrode disposed at a position facing the stylus with a recording paper in between, and having at least a portion facing the stylus having a constant radius; and a voltage is applied to the stylus and the gate electrode to generate magnetic ink. a magnetic ink flying means for flying the magnetic ink onto the recording surface by a coulomb, and an extension of a straight line connecting the tip of the stylus and the center of curvature of the gate electrode faces the gate electrode of the second bump magnet. A magnetic ink recording device characterized by forming an angle of 60° to 90° with a surface.