JPS5828383A - Magnetic fluid recorder - Google Patents

Abstract

PURPOSE:To enable to print a magnetic fluid recorder in high quality without containing air bubbles in magnetic fluid by driving slit forming member rotating means in response to the detection signal of magnetic fluid detecting means, thereby separating or contacting the member from or with a projecting magnet. CONSTITUTION:The space between the projecting magnet 3 of a magnetic fluid holder A and a slit magnet 3 is expanded by the elasticity of the outer wall 4' of a holding container 4. The magnetic fluid in a tank is raised by a pump, thereby raising the liquid level in the container 4, since the interval is wide even if the magnetic fluid is adhered to the edge D of the magnet 2 and the end edge E of the magnet 3, the holder A is not sealed, and the fluid does not accordingly contain air bubbles. When the holder A is filled completely with the magnetic fluid, a magnetic fluid sensor detects it, thereby driving a plunger 16, and moves the plunger 16 in a direction of an arrow F. In this manner, the outer wall 4' is rotated in a direction of an arrow G around the section C as a center, and the gap between both magnets 2 and 3 becomes narrow, but does not contain air bubbles.

Description

Detailed Description of the Invention The present invention provides a magnetic fluid recording method in which a magnetic fluid is raised on a magnetic multi-stylus by magnetic force, and the raised magnetic fluid is caused to fly by applying a Coulomb force to print on a recording surface. The present invention relates to a device and provides a magnetic fluid recording device that can smoothly and reliably supply magnetic fluid onto a magnetic multi-stylus in the initial stage before printing, and can obtain an image without irregularities or blurring of the print. That is.

Figures 1 and 2 show the schematic configuration of a conventional magnetic fluid recording device, in which a multi-stylus 1 is mounted on a substrate holder, and the multi-stylus 1 is magnetized on the multi-stylus 1. A raised magnet 2 is attached. A slit magnet 3 is attached opposite the bump magnet 2 to prevent pickpocketing.

A tote-shaped magnetic fluid holding portion A is formed. Below the bump magnet 2 and the slit H magnet 3 is a magnetic fluid holding container 4.
is installed, magnetic fluid holding gA and drain 1
The parts other than o are sealed. The holding container 4 is connected to a magnetic fluid tank 13 via a pump 12 by a pipe 11 connected to a drain 1o. The pump 12 pushes up the magnetic fluid to fill the holding container 4, and the pump is stopped when the magnetic fluid 6 is attached to the bump magnet 2. The bump magnet 2 and the slit magnet 3 are arranged with the same poles facing each other, and shield plates 2' and 3' made of magnetic metal are attached to the opposing surfaces, respectively, so that the magnet 2 and the slit magnet 3 are placed near the magnetic fluid holding part A. The lines of magnetic force are very concentrated, and the magnetic fluid adheres strongly to the magnetic fluid holding N5A.
is sealed.

Therefore, even if the pump is stopped, this state is maintained without air flowing into the holding container 4, and the multi-stylus 1
The protuberance 7 can be formed in accordance with the head height H from the tip of the magnetic fluid to the magnetic fluid liquid level in the magnetic fluid tank 13. Voltage application means 1 between multi-stylus 1 and control electrode 8
When a voltage is applied by 4, a Coulomb force acts near the tip of the protuberance 7, and the magnetic fluid 6 flies onto the recording medium 9 by itself, and a print is obtained on the recording medium 9. However, in this conventional configuration, pump 1 is turned on at the beginning before printing.
2 to push up the magnetic fluid and attach it to the bump magnet 2, the bump magnet 2 and slit magnet 3 inside the holding container 4 on the lower side of the slot-shaped magnetic fluid holding part A This may cause air bubbles to form in the area between the
There was a drawback that the supply of the magnetic fluid from the drain 10 to the magnetic fluid holding section A was obstructed.

This drawback will be explained below using figures.

When the ferrofluid in the ferrofluid tank is pushed up by the pump 12, the ferrofluid passes through the pipe 11, and as shown in FIG. I feel fulfilled. As shown in FIG. 3, when the liquid level of the magnetic fluid in the holding container 4 rises to a certain level, the magnetic fluid is sucked up by the magnetic force of the bump magnet 2 and the slit magnet 3. As mentioned above, since the magnetic force is very strong near the magnetic fluid holding part A,
The magnetic fluid sucked up by the magnetic force of the protrusion magnet 2 and the slit magnet 3 immediately adheres to the magnetic fluid holding part A, and the magnetic fluid holding part A is sealed. 4, bubbles B as shown in the figure are clustered.

When the liquid level of the magnetic fluid in the holding container 4 further rises,
At first, the amount of magnetic fluid adhered to the magnetic fluid holding part A is small and the sealing force is weak, so the air bubbles B gradually escape from the magnetic fluid holding part A and the holding container 4 is filled with magnetic fluid. However, when the holding container 4 is filled with the magnetic fluid to a certain extent, the amount of magnetic fluid attached to the magnetic fluid holding container sA increases as shown in FIG. Even if pressure is applied to forcibly supply the magnetic fluid into the holding container 4, the bubbles B will not come out at all.

Further, when the magnetic fluid is forcibly supplied, the magnetic fluid flows along the wall surfaces of the bumping magnet 2 and the slit magnet 3, and furthermore, the magnetic fluid is transmitted through the bumping magnet 2 and onto the multi-stylus 1. The air bubble B cannot be completely removed as shown in FIG. 3d. In this way, the pump 12 has air bubbles accumulated in the part sandwiched between the bump magnet 2 and the slit magnet 3 inside the magnetic fluid holding part A.
When the ridge 7 is stopped and the ridge 7 is formed according to the height H and printing is performed, the flow path of the ferrofluid is narrow by the air bubbles inside the ferrofluid holding part A, so the ridge 7 is The supply of magnetic fluid from the drain 1o to the magnetic fluid holding part A cannot keep up with the consumption of magnetic fluid from the tip.
Printing may become distorted or blurred.

As explained above, in the conventional configuration, air bubbles tend to accumulate inside the magnetic fluid holding part A, and these air bubbles cannot be completely removed. There was a major drawback in that it was not possible to smoothly supply the stylus to the holding part A, and furthermore, it could not be smoothly supplied from the bumping magnet 2 onto the multi-stylus 1, resulting in irregular or blurred printing. The invention is intended to eliminate such drawbacks, and one embodiment thereof will be described below.

FIG. 4 shows an outline of the overall configuration of one embodiment of the present invention, and FIG. 5 shows the operating principle of one embodiment of the present invention. A multi-stylus 1 is mounted on the base 5, and a bump magnet 2 for magnetizing the multi-stylus 1 is mounted on the multi-stylus 1. is glued. A magnetic fluid holding container 4 made of a material having some degree of elasticity is attached below the bump magnet 2. Furthermore, a slit magnet 3 arranged to face the uplift magnet 2 and an outer wall 4' of the holding container 4 are bonded to each other, and the outer wall 4' of the holding container 4 and the slit magnet 3 can rotate. The uplift magnet 2 and the slit magnet 3 have the same magnetic poles facing each other, and shield plates made of magnetic metal are attached to the opposing surfaces of the uplift magnet 2 and slit magnet 3, respectively, as in the conventional configuration. The parts other than the magnetic fluid holding part A and the drain 1o are sealed. The holding container 4 is connected to the magnetic ME moving body tank 1 via a pump 12 via a pipe 11 connected to a drain 1o.
It is connected to 3. A magnetic fluid detection sensor 15 is attached near the bump magnet 2, and a plunger 1-6 is attached to the back of the slit magnet 3 as shown in the figure. The plunger drive circuit is activated by the detection signal of the magnetic fluid detection sensor 15, and the plunger 1
6.

The operation will be explained below. Initially, before a magnetic fluid is attached to the bump magnet 2 and a predetermined bump 7 is formed on the multi-stylus 1, as shown in FIG. 5a, due to the elasticity of the outer wall 4' of the holding container 4, The distance between the protrusion magnet 2 and the slit magnet 3 of the magnetic fluid holding part A is in a state where it is very wide.

When the magnetic fluid in the magnetic fluid tank 13 is pushed up by the pump 12, the magnetic fluid passes through the pipe 11 and is filled from the bottom of the holding container 4.

As shown in FIG. 6, when the liquid level of the magnetic fluid in the holding container 4 rises to a certain level, the magnetic fluid is blown up by the magnetic force of the bump magnet 2 and the slit magnet 3, and the magnetic fluid is blown up by the magnetic force of the bump magnet 2 and the slit magnet 3. Although the magnetic fluid adheres to the tip edge portion and the tip edge portion EK of the slit magnet 3, the distance between the protrusion magnet 2 and the slit magnet 3 of the magnetic fluid holding portion A is wide;
Since the concentration of magnetic flux is small, the magnetic fluid holding part A is not sealed, and therefore, even if the liquid level of the magnetic fluid in the holding container 4 is further increased, there is no space between the bump magnet 2 and the slit magnet 3. The magnetic fluid retaining portion A is completely filled with the magnetic fluid without any bubbles as shown in FIG. 60. When the magnetic fluid sensor 15 detects that the magnetic fluid is sufficiently attached to the magnetic fluid holding portion A, the plunger 16 is driven by the plunger drive circuit 17, and the plunger 16 moves in the direction of arrow F. In the direction, the slit magnet 3 and the outer wall 4' of the holding container 4 are aligned with the arrow G with the 0 part as the center.
The distance between the uplift magnet 2 and the slit magnet 3 toward the magnetic fluid holding portion becomes narrower, resulting in the state shown in FIG. 6d. Needless to say, in this state, the inside of the holding container 4 contains no air bubbles at all. Fifth
As shown in Figure d, when the distance between the bump magnet 2 and the slit magnet 3 is narrow, the magnetic flux is very concentrated in the magnetic fluid holding part A, so the magnetic fluid adheres strongly.
The magnetic fluid holding part A is sealed. Therefore pump 12
Even when the stylus is stopped, this state is maintained without air flowing into the holding container 4, and as shown in FIG. The protuberance 7 can be formed in accordance with the head H of.

Note that as the magnetic fluid detection sensor, for example, a current detection type sensor as shown in FIG. 6 can be used. Specific examples are shown below. The two electrodes 18 are arranged to face each other at a predetermined interval, and a voltage is applied between the two electrodes 18 by a power source 19 via a resistor R. 6th (i) When the magnetic fluid is not attached to the electrode 18 as shown in a, μ, the resistance between the electrodes 18 is infinite, and the voltage across the resistor 8 is v8.
is OV. However, as shown in FIG. 6, when the magnetic fluid 6 adheres to the tips of the electrodes 18 and bridges between the electrodes 18, the magnetic fluid has a conductivity of about 106 to 10". , a voltage Vs corresponding to the voltage of the power supply 19, the resistance of the magnetic fluid attached between the electrodes 18, and the resistance R is generated across the resistor R.The voltage Vs across the resistor R This means that it can be used as a body detection signal.

As described above, according to the present invention, it is possible to attach the magnetic fluid to the magnetic fluid holding portion without creating air bubbles inside the magnetic fluid holding container. When printing is performed by forming a ridge corresponding to the drop to the magnetic fluid liquid level in the tank, the supply from the drain to the magnetic fluid holding part is not obstructed, ensuring stable high-quality printing. You can get it.

[Brief explanation of the drawing]

1(9) and 2 are schematic configuration diagrams of a conventional magnetic fluid recording device, and 30α to 30d are diagrams showing how air bubbles are trapped in the magnetic fluid holding container in the conventional configuration.
FIG. 4 shows one embodiment of the present invention, 1...multi-stylus, 2... magnet for elevation. 2'... Magnet shield plate for elevation, 3...
- Slit magnet, 3'... Slit magnet shield plate, 4... Magnetic fluid holding container, 6-...
...Base, 6...Magnetic fluid, 7...
・Protuberance, 8... Control electrode, 9... Recording body, 1o... Drain, 11... Nokub, 12... Pump, 13... Magnetic fluid tank, 14... Voltage application means, 16.
...Magnetofluid sensor, 16...Plunger, 17...Plunger drive circuit, A
......Magnetic fluid holding part, B...Bubble,
18... Electrode, 19... Power supply. Name of agent: Patent attorney Toshio Nakao and 1 other person11
hlII! Vote 2 Figure 135II ra) tb> ri((1)
(Fig. 4, Fig. 5 ((L) Fig. 5, Fig. 116, Q)

Claims (1)

[Claims] a magnetic multi-stylus recording electrode provided facing a recording surface; a bumping magnet provided in contact with the vicinity of a tip of the recording electrode to bump a magnetic fluid onto the recording electrode; a slit component made of a magnetic material provided opposite to the protrusion magnet so as to form a slit-shaped magnetic fluid holding portion therebetween; and a magnetic fluid storage portion provided below the recording electrode. a conduit connecting the slit-shaped magnetic fluid holding section and the magnetic fluid storage section; and a pipe line connecting the slit-shaped magnetic fluid storage section to the magnetic fluid storage section; a supply means for supplying the magnetic fluid up to the magnetic fluid holding portion, the slit forming member is configured to be able to move toward and away from the bumping magnet, and a slit forming member rotating means for rotating the slit forming member. established,
A magnetic fluid detection means is provided near the uplift magnet, and the slit constituent member-movement stage is driven in response to a detection signal from the magnetic fluid detection means to remove the slit constituent member from the uplift magnet. A magnetic fluid recording device characterized in that the magnetic fluid recording device is made to move toward and away from each other.