JPS58148775A - Magnetic fluid recorder - Google Patents

Abstract

PURPOSE:To stabilize the concentration of a magnetic fluid by quickly washing away concentrated magnetic fluid adhered to a location near a recording needle by a method in which the second supply path for the magnetic fluid is provided and during nonrecording period, the nozzle of the second supply path is connected to the supply port for recording fluid. CONSTITUTION:A nozzle 18 is extended in the set direction of a recording needle 1 and set in a freely opening manner at a shaft 14 as the center, and the nozzle 18 is also connected to a magnetic fluid storage portion 6 through the second pipe supply path 15. During nonrecording period, the nozzle 18 is led to a slit-shaped supply port A consisting of a slit magnet 4 and a upheaval magnet 3, and a supply pump 11 is operated by a flow control means 12 in such a way that magnetic fluid 9 can flow the second pipe supply path 15 and the nozzle 18 to the first pipe supply path 13. By this, concentrated magentic fluid adhered to the tip of the recording needle 1 and the supply port A is washed away in a short time and the vaporization of solvent is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a magnetic recording medium that obtains prints by holding and protruding a magnetic fluid on a recording needle made of a magnetic material by magnetic force and causing the magnetic fluid to fly onto the recording paper surface by applying Coulomb force. This relates to a fluid recording device that quickly removes concentrated magnetic fluid generated near the tip of a recording needle due to magnetic field and evaporation at least before recording starts when not recording, and forms a bump with unconcentrated magnetic fluid. The aim is to obtain stable image quality by doing so.

A conventional example will be explained using FIGS. 1 to 3.

FIG. 1 is a perspective view of the head of a conventional magnetic fluid recording device.
FIG. 2 is a schematic sectional view of the device, and FIG. 3 is a sectional view of the main part of the head portion.

A plurality of recording needles 1 made of a magnetic material are mounted on a substrate 2 at equal intervals. A raised magnet 3 is glued onto the recording needle 1, and a slit magnet 4 is attached to form a feeding donkey.
The magnetic fluid holding section 5 is configured by providing the above. A pipe supply path having a storage section 6 and a supply pump 7 is provided behind the magnetic fluid holding section 6 . When the supply pump 7 stops operating like an axial flow pump, the supply pump 7
The magnetic fluid 9 is constituted by a movable pump. Further, the operation of the supply pump 7 is performed by a flow rate control means 8. After the supply pump 7 is operated to supply the magnetic fluid 9 in the storage section 6 to the magnetic fluid holding section 5 and the tip of the recording needle 1, the operation of the supply pump 7 is stopped and the recording needle 1 and the storage section 6 are An appropriate protuberance is formed at the tip of the recording needle 1 by appropriately setting a drop H from the liquid level. The flight control means 10 applies a Coulomb force to the magnetic fluid 9 held at the tip of the recording needle 1 to cause it to fly.

Although the conventional apparatus is configured as described above, when recording is stopped, as shown in FIG. And magnetic field concentration occurs due to the magnetic force of the slit magnet 4, and the solvent evaporates and viscosity increases, resulting in poor fluidity.
Even if recording is started, the magnetic fluid 9 is not supplied as the magnetic fluid 9 is consumed, and only the magnetic fluid 9 held at the tip of the recording needle 1 flies away, making subsequent printing impossible. There was a lot going on. In cases where the grooves were severe, there were cases where the printer could not fly at all and could not print.

The present invention solves this problem and provides a magnetic fluid recording device that can stably obtain high-quality printed images.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 7. FIG. 4 shows a sectional view of a magnetic fluid recording device that is an embodiment of the present invention. Reference numeral 1 indicates recording needles made of a magnetic material, and a plurality of recording needles are arranged on the substrate 2 at equal intervals.

A raised magnet 3 is bonded onto the recording needle 1 so as to magnetize the recording needle 1 and raise a magnetic fluid 9 at the tip of the recording needle 1.

Reference numeral 4 denotes a slit magnet for holding and supplying the magnetic fluid 9, which is fixed to the holding portion 5 so as to face and extend apart from the raised magnet 3 to form a slit-shaped supply port A. A storage section 6 for storing the magnetic fluid 9 is provided behind the holding section 5, and a supply pump 1 is provided between the holding section 5 and the storage section 6.
1 and connected by a first pipe supply path 13 having a diameter of 1.

The supply pump 11 is a pump in which the magnetic fluid 9 can move in the supply pump 11 when the operation is stopped like an axial flow pump, so that the magnetic fluid 9 can flow forward and backward, and is operated by the flow rate control means 12. 18 is a nozzle for cleaning the vicinity of the tip of the recording stylus 1 by blowing out the magnetic fluid 9 toward the vicinity of the tip of the recording stylus 1. During cleaning, the nozzle 18 and the supply port A of the first pipe supply path 13 are connected. The tip of the nozzle 18 is formed to do so. Further, the nozzle 18 is extended in the arrangement direction of the recording needle 1 so that the tip of the nozzle 18 faces the vicinity of the tip of the recording needle 1 during cleaning, and is provided so as to be freely openable about the shaft 14. ) or the nozzle 18 is moved manually. At this time, the control electrode 16° and the recording paper 17 are also moved backward in synchronization with the nozzle 18. The rear end of the nozzle 18 is connected to the reservoir 6 by a second pipe supply path 15 . 1o is 61, - a flight control means that applies a voltage between the recording needle 1 and the control electrode 16 to exert a Coulomb force on the magnetic fluid 9 raised at the tip of the recording needle 1, and causes it to fly to the surface of the recording paper 17. let

Next, the operation of this device will be explained. First, the magnetic fluid 9 is placed in the reservoir 6 so that the liquid level is higher than the position of the supply pump 11 , and the flow rate control means 11 is used to control the supply pump 11 .
is activated to push up the magnetic fluid 9 to the holding portion 5 and the tip of the recording needle 1. In this state, the operation of the supply pump 11 is stopped, and the liquid level in the reservoir 6 and the tip of the recording stylus 1 are adjusted so as to have an appropriate raised step C at the tip of the recording stylus 1 as shown in FIG. The head height H' is adjusted and the reservoir 6 is held by appropriate holding means (not shown).

In this state, the supply pump 11 is not operating, but the magnetic force of the raised magnet 3 and the slit magnet 4 causes the magnetic fluid 9 to flow through the supply port A.
is maintained and balanced without running out, and an amount of ferrofluid corresponding to the consumed ferrofluid is supplied to the supply pump 11. It passes through the first pipe supply path 13 and is automatically replenished. When the flight control means 10 applies a voltage between the recording needle 1 and the control electrode 16 to the magnetic fluid 9 raised at the tip of the recording needle 1, a Coulomb force acts on the tip of the bump, and the magnetic fluid 9 moves to the recording needle. A recorded image can be obtained by flying toward the target.

When recording is completed, the nozzle 18 and the supply port A are connected as shown in FIG. 15. The supply pump 11 is operated by the flow control means 12 so that the flow from the nozzle 18 to the first pipe supply path 13 occurs. As a method for removing the concentrated magnetic fluid 9 adhering to the vicinity of the tip of the recording needle 1 before starting recording, the supply pump 11 is operated as shown in FIG. 6 to blow out the magnetic fluid 9 from the supply port A. However, since the magnetic fluid 9 flows as shown by the arrow, the concentrated magnetic fluid 9a, 9b adhering to the vicinity of the tip of the recording needle 1 and the supply port A
is difficult to wash away, and it is necessary to blow out the magnetic fluid 9 for a long time. However, as shown in FIG. 7, by connecting the nozzle 18 and the supply port A so that the tip of the nozzle 18 faces the vicinity of the tip of the recording needle 1, and flowing the magnetic fluid 9 from the nozzle 18 toward the supply port A. As the magnetic fluid 9 flows along the slopes of the recording needle 1 and the raised magnet 3 as shown by the arrows, the concentrated magnetic fluid 9a and 9b adhering to the vicinity of the tip of the recording needle 1 and the supply port A are short. It can be washed away in time. Furthermore, by connecting the nozzle 18 and the supply port A to form a closed loop between the first pipe supply path 13 and the second pipe supply path 15, changes in the concentration of the magnetic fluid 9 due to evaporation of the solvent of the magnetic fluid 9 can be prevented. It is possible to clean the vicinity of the tip of the recording stylus 1 and the supply port with a simple structure without causing the magnetic fluid 9 to adhere to unnecessary locations.

In this way, in this embodiment, the raised magnet and
Concentrated magnetic fluid that adheres to the vicinity of the tip of the recording needle and to the supply port formed by the raised magnet and slit magnet, which is generated by the magnetic force of the slit magnet and the evaporation of the solvent of the magnetic fluid, can be quickly washed away. Since the ridges are formed with a magnetic fluid free of turbidity, stable image quality can always be obtained.

Furthermore, since the nozzle and the supply port are connected during non-recording, evaporation of the solvent of the magnetic fluid is reduced and the concentration of the magnetic fluid can be stabilized.

As described above, according to the present invention, high quality images can always be stably obtained.

[Brief Description of the Drawings] Fig. 1 is a perspective view of the head section of a conventional magnetic fluid recording device, Fig. 2 is a schematic sectional view of the same device, and Fig. 3 is a sectional view of main parts of the head section. Fig. 4 is a schematic cross-sectional view of a magnetic fluid recording device that is an embodiment of the present invention, Fig. 5 is an enlarged view of the tip of the recording needle of the same device, and Fig. 6 is a conventional device in which magnetic fluid is used in the head section of the device. FIG. 7 is an explanatory diagram showing the flow of the magnetic fluid when it is blown out from the head of the device shown in FIG. 4. . 1...recording needle, 2...board, 3...
... Raised magnet, 4... Slit magnet, 5...
...Holding section, 6... Storage section, 7, 11...
... Supply pump, 8, 12 ... Flow rate control means, 9 ... Magnetic fluid, 1o ... Flight control 1. Means, 13...First pipe supply path, 14...
Curved axis, 15...Second pipe supply path, 16...
...Control electrode, 17...Recording paper, 18...
·nozzle. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 4

Claims (1)

[Claims] (1) A recording needle made of a magnetic material provided corresponding to the recording surface, a raised magnet that magnetizes the recording needle and raises a magnetic fluid at the tip of the recording needle, and a raised magnet at the tip of the recording needle. a flight control means for causing the magnetic fluid to fly to the recording surface in response to an image signal; and a first reservoir having a supply port near the tip of the recording needle and supplying the magnetic fluid to the tip of the recording needle during recording. and a second supply means having a nozzle that blows out a magnetic fluid toward the vicinity of the tip of the recording needle during non-recording, wherein at least a nozzle portion of the second supply means is movable and non-transferable. The magnetic fluid is connected to the second supply means to form a closed loop during recording, and the magnetic fluid is caused to flow from the second supply means to the first supply means for a certain period of time before the start of recording. Fluid recording device. (2. The magnetic fluid described in claim 1, characterized in that the first supply means is operated to move the magnetic fluid in a direction opposite to the direction in which the magnetic fluid flows during recording. Recording device.