JPS58142867A - Magnetic ink recorder - Google Patents

Abstract

PURPOSE:To prevent the flying of noises, and to obtain a picture having high quality by regulating relative positions between a multi-stylus and a gate electrode in the magnetic ink recorder recording by flying magnetic ink. CONSTITUTION:The multi-stylus 1 is set up opposed to recording paper 15, and magnets 3, 5 for first and second projections magnetizing the multi-stylus 1 are provided. The gate electrode 13 is extended in the direction of forwarding of recording paper 15 while being opposed to the multi-stylus 1 through recording paper 15, one end is positioned at a section up to the position of a slitty opening section 6 formed by the magnets 3, 5 for the first and second projections beyond the position of the opposite multi-stylus 1, and the other end is positioned at the side reverse to the position of the slitty opening section 6 to the multi- stylus 1. Magnetic ink 8 is protruded at the tip of the stylus 1, voltage is applied between the gate electrode 13 and the stylus, and the ink is flown by Coulomb force and recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves magnetizing a stylus made of a magnetic material to bulge magnetic ink at the tip of the stylus, and applying a voltage corresponding to an image signal between a gate electrode and a gate electrode facing each other across a sheet of recording paper. This relates to a magnetic ink recording device that performs recording by applying a Coulomb force to cause magnetic ink to fly, and to prevent so-called noise flying in which magnetic ink flies from a BCC field other than from the tip of the stylus. With the goal.

First, an outline of a conventional magnetic ink recording apparatus will be explained using FIGS. 1 to 3. The stylus 1 is a multi-stylus made of magnetic material, and is regularly arranged on a base 2. Reference numeral 3 denotes a first raised magnet, which is placed above the multi-stylus 1. The first magnet 3' has a magnetic pole on a surface opposite to the side surface to which the stylus is bonded, as shown in the figure, and a shield plate 4 made of a magnetic material is provided on the magnetic pole surface opposite to the surface to which the stylus is bonded. All glued together. 6
is a second uplift magnet, which is attached so as to form a slot-shaped opening 6 with the first uplift magnet 3. Further, as shown in the above, a shield plate 7 made of a magnetic material is bonded to a fly pole surface which constitutes a magnetic pole and constitutes the slit-shaped opening 6 on the side of the first uplift magnet 3. The shield plates 4 and 7 are made of a material that is difficult for magnetic flux & to pass through in the direction of the plate thickness, but allows magnetic flux lines to pass in the direction perpendicular to the plate thickness, and concentrates the magnetic flux lines in the slit-shaped opening 6 to increase the magnetic field gradient. The structure is such that the force for holding the magnetic ink 8 is strong. A magnetic ink retaining portion e is formed at the lower part of the first and second raised stones 3 and 6, and this ink retaining portion 9 is provided over the array width of the multi-stylus 1, and the slit-shaped opening 6 and a part of its lower position communicates with the supply pipe 10. A supply pump 11 communicates with the supply pipe 10 and is provided below the liquid level of the ink tank 212. Further, the supply pump 11 is configured to allow ink to freely pass through when stopped, such as an axial flow pump. With the above configuration, the magnetic ink 8 is first supplied to the ink reservoir 9 and the slit-shaped opening 6 by the supply pump 11. When the magnetic ink 8 is filled up to the slit-shaped opening 6, a holding force is exerted by the magnetic force in the slit-shaped opening 6. Therefore, even if the supply pump 11 is stopped, the magnetic ink 8 remains filled up to the slit-shaped opening 6. Although there is a head difference H between the slit-shaped opening 6 and the liquid level of the ink tank 12, the holding force at the slit-shaped opening 6 creates a balanced state. This drop is set so that an appropriate protuberance is formed at the tip of the multi-stylus 1 within a range that does not cause the ink to run out at the slit-shaped opening 6. When the slit-shaped opening 856 is filled with the magnetic ink 8, the magnetic ink 8 is supplied to the tip of the multi-stylus 1 through the slope of the first ridge i magnet 3 to form a ridge.

Reference numeral 13 denotes a gate electrode, and a voltage is applied between it and the multi-stylus 1 by a voltage application line 14 that applies a voltage corresponding to an image signal, and a Coulomb force is applied to the magnetic ink 8 to cause it to fly onto the recording paper 16. The system is configured to perform recording using

Next, the details of the conventional magnetic ink recording device configured as described above will be explained.

The magnetic ink 8 is inserted into the slit-shaped openings s6 and 7. On the tip side of the multi-purpose stylus 1, it bulges at the tip of the multi-purpose stylus 1 shown in the figure and the slit-shaped opening 6 and the end opposite to the slit-shaped opening 6 of the magnet 6 for raising the pond 2,
It has a raised shape. Furthermore, the gel electrode 18 was configured to extend from both sides of the stylus 1 at approximately the center and include the three magnetic ink embankments mentioned above.In such a configuration, the multi-stylus When a voltage corresponding to the image signal is applied between 1 and the gate electrode 13,
The amphoteric ink 8 on the protuberance a at the tip of the stylus 1 flies along with the recording paper 16 due to Coulomb force. At this time, the potential on the surface of the recording paper 16 varies with respect to the length of the gate electrode 13, as shown in FIG. The position of the protrusion a on the tip of the stylus 1 and the protrusion sb on the end of the second protrusion magnet 5 are both included in the area where a constant voltage is expressed on the surface of the recording paper 16. Therefore, the conditions are such that it is easy to fly from the protuberance ib. The electric charge applied to the tip of the stylus 1 passes through the magnetic ink 8 and the raised part gradually becomes charged, and when the electric charge necessary for flying between the stylus 1 and the recording paper 16 is charged, the raised part becomes more charged. , and this becomes noise flight. Therefore, there is a drawback that intermittent flying occurs on the recording paper 16 regardless of the image signal, degrading print quality.

The present invention eliminates these drawbacks.

To provide a magnetic ink recording device capable of obtaining high quality printing with less noise flying. An embodiment of the present invention will be described below with reference to FIGS. 4 to 8.

The fourth quotient is a diagram showing the essential S configuration of a magnetic ink recording apparatus which is an embodiment of the present invention. In the figure, reference numeral 1 denotes a stylus made of a magnetic material, which is regularly arranged on a base 2. Reference numeral 3 denotes a first bump magnet, which is placed in contact with the stylus 1, and has a shield plate 4 provided on the side opposite to the stylus contact surface.

As shown in the figure, the first bump magnet 3 is formed so that the stylus contact surface and the shield plate arrangement surface are respectively magnetic pole surfaces, and the side surface of the tip of the stylus 1 is formed at an acute angle. 6 is a second uplifting magnet, and between it and the first uplifting magnet 3 is a pair of slit-shaped openings 86; l! It is arranged so that it can be achieved. Further, a shield plate 7 is provided on the side where the first uplift magnet 3 and the slit-shaped opening 6 are formed, and as shown in the figure, a magnetic pole 'kiF! has been completed. The shield plates 4 and 7 allow the magnetic flux to pass through in the thickness direction.
, and is made of a material that allows magnetic flux to pass easily in the direction perpendicular thereto, and is constructed so that the magnetic flux Ilj! is entirely concentrated at the slit-shaped opening s6, so that the force for holding the magnetic ink 8 is strong. The second uplift magnet 5 is arranged at an angle of 100 to 30 degrees with the first uplift magnet 3.

This means that the slit-shaped opening 6 has a diameter of 0.1 to 0.5. Since the width is narrow, if the narrow width part is made long, the flow of the magnetic ink 8 will be poor in that part, and the supply performance to the tip of the stylus 1 will be poor, and air may get into the ink reservoir part 9. This is because it becomes difficult to remove air. 6th
The figure shows the angle θ of the end of the second bump magnet 6 and the magnetic ink retention force (magnetic ink 8
It is indicated by the head H that is held. ), which indicates the relationship between
The larger the angle θ, the stronger the holding force becomes. Further, FIG. 6 shows the thickness t of the second uplifting magnet 6 and the slit-shaped opening 6.
This graph shows the relationship between the magnetic ink retention force and the magnetic ink retention force, indicating that the thicker the thickness t, the stronger the retention force.

Although the characteristics shown in FIGS. 6 and 6 change depending on the conditions of the first uplift magnet 3, the first uplift magnet 3 is shown as one pair. The second uplift magnet 6 has an angle θ of approximately 90
'N thickness is comprised from 2 to 415. The distance between the tip end surface of the second uplifting magnet 6 and the opposing recording paper 16 is longest at the position of the slit-shaped opening 6, and becomes shorter as the distance from the slit-shaped opening 6 increases. Therefore, the angle θ and the thickness t are determined so that the portion of the tip end surface of the second bulging magnet 2 that is closest to the recording paper 15 is at least no closer than the distance between the stylus 1 and the recording paper 16. It is composed of 13 is a gate electrode,
One end is disposed at a position substantially facing the slit-shaped opening 6. Therefore, the voltage applied to the gate electrode 13 is applied to the surface of the recording paper 15 as shown in FIG. . Further, at the position of the bulge of the second raised magnet 6, the potential of the gate electrode 13 hardly affects the surface of the recording paper 160. Therefore, is there a potential in stylus 1? Even if the raised portion is charged with electric charge, it will not fly toward the recording paper 15. Therefore, unlike the conventional case, noise is not emitted intermittently from the raised portion of the second raised magnet 6, and stable and high print quality can be ensured. As shown in FIG. 8, the gate electrode 13 has a rectangular pattern made of a film lead or the like and is attached to a gate electrode indicator (not shown). Further, a predetermined number of the styli 1 are configured to correspond to one gate electrode 13, and matrix driving is performed. When one end of the gate electrode 13 is shifted to a position corresponding to the stylus 1 or further to the side opposite to the slit-shaped opening 6, as can be seen in FIG. Therefore, unless the voltage is increased more than necessary, it will not fly. The results confirmed by experiments show that if the end of the gate electrode 13 is located close to the slit-shaped opening 6 at approximately O, a, and Q degrees from the stylus 1, the magnetic ink 8 is ejected by a negative voltage. Therefore, one end of the gate electrode 13 is 0.0 mm from the stylus tip position.
It is preferable that about 6u be located on the slit-shaped opening 6 side.

In this example, an example was shown in which the second protrusion magnet had an end angle θ of eo′, but
If the o0 magnet is used as the second bump magnet, the noise can be further reduced.

As described above, according to the present invention, magnetic ink can be prevented from flying noise from parts other than the protrusion at the tip of the stylus, and stable and high printing quality can be obtained.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional magnetic ink recording device;
The figure is an enlarged view of the main parts of the same apparatus, the third factor is a characteristic diagram showing the potential of the recording paper surface of the same apparatus, FIG. 4 is an enlarged view of the main parts of a magnetic ink recording apparatus which is an embodiment of the present invention, FIG. 6 is a characteristic diagram showing the relationship between the second uplifting magnet 0 of the device and the holding force of the magnetic ink 6 in the slit-shaped opening.
Figure 7 is a characteristic diagram showing the relationship between the thickness of the protruding magnet and the magnetic ink retention force in the slit-shaped opening, Figure 7 is a characteristic diagram showing the potential of the gate electrode and the surface of the recording paper of the same device, and Figure 8 is the same. FIG. 3 is a perspective view of the gate electrode of the device. DESCRIPTION OF SYMBOLS 1... Multi-stylus, 2... Base, 3... First bump magnet, 4... Shield plate, 5...・Second bump magnet, 6...
...Opening, 7...Shield plate, 8...
...Magnetic ink, 9...Magnetic ink retainer, 1
o... Supply pipe, 11... Supply pump, 12... Ink tank, 13...
Gate electrode %14-... Voltage application means, 16...
...Record, i. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 4 Figure 5 Figure 6 Figure 7 isI! I

Claims (1)

[Claims] between a multi-stylus provided facing the recording paper, a first protrusion magnet provided in contact with the vicinity of the tip of the multi-stylus to magnetize the multi-stylus, and the first protrusion magnet; a head having a second protrusion magnet provided to form a slit-shaped opening with a constant width; a supply means for supplying magnetic ink to the head; and a supply means provided opposite to the multi-stylus via the recording paper. a voltage applying means for applying a voltage corresponding to an image signal between the multi-stylus and the gate electrode; the gate electrode extends in the recording paper feeding direction; The other end of the multi-stylus is located between the opposing multi-styli and the slit-like opening, and the other end is located on the opposite side of the multi-stylus from the slit-like opening. Features of magnetic ink recording device.