JPS6349629B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a magnetic force to hold and bulge a magnetic fluid on a multi-stylus recording needle made of a magnetic material, and causes the magnetic fluid to fly by applying a Coulomb force. This relates to a magnetic fluid recording device that prints on the top of the stylus, and when the stylus is stopped, the magnetic fluid that is concentrated near the tip of the stylus is quickly removed by the magnetic field and evaporation before the start of flight recording, and a bump is formed with the magnetic fluid that is not concentrated. The aim is to obtain stable image quality.

A conventional magnetic fluid recording device will be explained using FIGS. 1 to 3.

A plurality of recording needles 1 are made of a magnetic material and are arranged on a substrate 2 at equal intervals. Above the recording needle 1,
A raised magnet 3 is bonded and a slit magnet 4 is further provided to form a magnetic fluid holding portion 5. A storage section 6 is provided behind the magnetic fluid holding section 5, and the magnetic fluid holding section 5 and the storage section 6 are connected by a pipe supply path having a supply pump 7 in the middle, and the supply pump 7 supplies the magnetic fluid 8. is supplied to the magnetic fluid holding unit 5 and an appropriate bulge is formed on the tip of the recording needle 1 with the operation of the supply pump 7 stopped, and when the magnetic fluid 8 is not supplied by the supply pump 7, the magnetic fluid is The head difference H between the recording needle 1 and the liquid level in the storage section 6 is set so that the magnetic fluid 8 is automatically supplied in accordance with the consumption of the magnetic fluid 8. The control means 9 applies a Coulomb force to the magnetic fluid 8 held at the tip of the recording needle 1, causing it to fly. Although configured as described above, when recording is stopped, as shown in FIG. 4 causes magnetic field concentration, and the solvent evaporates and concentrates, resulting in poor fluidity, and even when recording starts, the magnetic fluid is not supplied as the magnetic fluid 8 is consumed, and the recording needle 1 Only the magnetic fluid 8 held at the tip of the magnetic fluid 8 flew away, and subsequent printing was no longer possible. Furthermore, in severe cases, there were cases where the ink did not fly at all and printing was impossible.

The present invention eliminates such drawbacks,
An object of the present invention is to provide a magnetic fluid recording device that can always obtain high-quality recorded images.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 8. FIG. 4 is a block diagram of a magnetic fluid recording device which is an embodiment of the present invention, FIGS. 6 and 8 are explanatory diagrams of the operation of the device, and FIG. 5 is a recording device which is another embodiment of the present invention. It is a block diagram of a device.

The recording needles 1 are made of a magnetic material, and a plurality of recording needles 1 are arranged on the substrate 2 at equal intervals. On the recording needle 1, the recording needle 1 is magnetized and a magnetic fluid 8 is placed at the tip of the recording needle 1.
A raised magnet 3 extending over the entire array width of the recording stylus 1 is bonded so as to raise it. 5 is
This is a holding part for holding the magnetic fluid 8, in which the slit magnet 4 is fixed so as to face the raised magnet 3, and the supply pipe 10 and a portion thereof are connected. The slit magnet 4 is fixed to the holding portion 5 so as to extend opposite to the raised magnet 3 and constitute a supply port B sandwiched between both magnets. The raised magnet 3 and the slit magnet 4 each have magnetic shield plates 11 and 12 with high magnetic permeability inside the holding part 5, so as not to apply magnetic force to the magnetic fluid 8 inside the holding part 5. This configuration prevents the magnetic fluid 8 from concentrating in the magnetic field within the holding section 5. The supply pipe 10 has one end connected to the holding section 5 and the other end connected to the storage section 6 that stores the magnetic fluid 8.
A supply pump 7 is also provided in the middle. 11a
is a flow rate control means for operating and stopping the supply pump 7.

12a is a guide member that guides the flow direction of the magnetic fluid 8 in the vicinity of the tip of the recording stylus 1; the surface on the side where the magnetic fluid 8 flows is substantially parallel to the slope of the raised magnet 3; It is fixed to the holding part 5 at intervals. Reference numeral 13 denotes a recovery section that recovers the surplus magnetic fluid 8 supplied by the supply pump 7 . A recovery pipe 14 is connected to a part of the recovery section 13 , and the other end of the recovery pipe 14 is connected to the storage section 6 .
The supply pump 7 is constructed of a pump in which the magnetic fluid 8 is movable within the supply pump 7 when the operation is stopped, such as an axial flow pump. 9 is a flight control means which applies a voltage between the recording needle 1 and the control electrode 15 to exert a Coulomb force on the magnetic fluid 8 raised at the tip of the recording needle 1, as shown in FIG. It is caused to fly onto the surface of the recording paper 16.

Next, its operation will be explained. Initially, the magnetic fluid 8 is placed in the storage section 6 at a position higher than that of the supply pump 7, and the supply pump 7 is operated by the flow rate control means 11a to transfer the magnetic fluid 8 to the holding section 5 and the recording needle. Push it up to the tip of 1. In this state, the operation of the supply pump 7 is stopped. Next, as shown in FIG. 6, the drop H' between the liquid level in the reservoir 6 and the tip of the recording stylus 1 is adjusted so that an appropriate protrusion with a difference a is obtained at the tip of the recording stylus 1, and 6 is held by suitable holding means (not shown). In this state, the supply pump 7 is not operating, but the magnetic fluid 8 is held at the supply port B by the magnetic force of the raised magnet 3 and the slit magnet 4, and is balanced without being cut.
The consumed amount is automatically replenished through the supply pipe 10 and the supply pump 7. When the flight control means 9 applies a voltage between the recording needle 1 and the control electrode 15 to the magnetic fluid 8 raised at the tip of the recording stylus 1, a Coulomb force acts on the tip of the bump, and the magnetic fluid 8 stops recording. A recorded image can be obtained by flying toward the surface of the paper 16. When recording is completed, the recording is stopped for a certain period of time, and then the next recording is to be performed, the supply pump 7 is operated by the flow rate control means 11a for a certain period before the start of recording, and the magnetic fluid 8 is blown out from near the tip of the recording needle 1. let Blown out magnetic fluid 8
passes through the collection section 13 and the collection pipe 14 to the storage section 6.
is flowing into the country. Magnetic fluid 8 when the supply pump is activated and the magnetic fluid 8 is blown out before the start of recording
The flow is shown in Figures 7 and 8. The conventional recording device shown in FIG. 7 shows the flow of the magnetic fluid 8 without the guide member 12a, and the concentrated magnetic fluid 8A adhering to the supply port B flows as indicated by the arrow. is washed away, but the concentrated magnetic fluid 8A adhering to the area A near the tip of the recording stylus 1 is difficult to be washed away, and it is necessary to blow out the magnetic fluid 8 for a long time. However, as shown in FIG. 8, by providing the guide member 12 near the tip of the recording stylus 1, the magnetic fluid 8 flows along the slope of the raised magnet 3 and the recording stylus 1. Concentrated magnetic fluid 8A attached near the tip of 1
can be washed away in a short time. As described above, by blowing out the magnetic fluid for a certain period of time before recording starts, the magnetic fluid 8A that is concentrated due to magnetic force and evaporation near the supply port and the tip of the recording needle 1 when stopped is quickly washed away, and the magnetic fluid without concentration is Recording is performed by guiding the fluid 8 and forming bumps with the unconcentrated magnetic fluid 8.

Although the guide member 12a is fixed in FIG. 4, the guide member 12a is fixed when recording or when cleaning the head section with cloth, paper, etc.
Similar effects can be obtained even if the guide member 12a is configured to be detachable so as to separate the guide members 2a. FIG. 5 shows an embodiment in which the guide members are separated during recording and when cleaning the head portion with cloth, paper, etc. In the figure, reference numeral 17 denotes a removable guide member, which is fixed to the collecting section 18. The collecting section 18 is provided so as to be freely openable about a shaft 19, and is opened by an opening control means (not shown) or manually. The control electrode 15 and the recording paper 16 are configured to be movable in the axial direction of the recording needle 1. When washing away the concentrated magnetic fluid 8 adhering to the vicinity of the tip of the recording needle 1 due to the blowout of the magnetic fluid, as shown by the solid line in FIG.
The collecting section 18 is moved toward the recording needle 1, the guide member 17 is moved near the recording needle 1, and the control electrode 15 and the recording paper 16 are separated from the recording needle as shown by the solid line in the figure. After blowing out the magnetic fluid 8, as shown by the two-dot chain line in the figure, the recovery section 18
Then, the guide member 17 is separated from the recording needle 1, the control electrode 15 and the recording paper 16 are brought closer to the recording needle 1, and a bump is formed using the unconcentrated magnetic fluid 8 to perform recording.

As described above, according to the present invention, during recording stop, the concentrated magnetic fluid adheres to the vicinity of the tip of the recording needle and the concentrated magnetic fluid adheres to the opening formed by the raised magnet and the slit magnet. can be quickly washed away, and appropriate protuberances can be formed with a non-concentrated magnetic fluid, making it possible to provide a magnetic fluid recording device that can always obtain stable image quality.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the head section of a conventional magnetic fluid recording device, FIG. 2 is a schematic configuration diagram of the same device, FIG. 3 is a sectional view of essential parts of the head section of the same device, and FIG. 7 is an explanatory diagram of the operation of the device, FIG. 4 is a schematic configuration diagram of a magnetic fluid recording device that is an embodiment of the present invention, and FIG. 6 is an enlarged view showing the raised shape of the tip of the recording needle of the device. , FIG. 8 is an explanatory diagram of the operation of the same device, and FIG. 5 is a schematic diagram of the configuration of a magnetic fluid recording device according to another embodiment of the present invention. 1... Recording needle, 2... Substrate, 3... Raised magnet,
4... Slit magnet, 5... Holding section, 6... Storage section, 7... Supply pump, 8... Magnetic fluid, 9...
... Flight control means, 10 ... Supply pipe, 11, 1
2... Magnetic shield plate, 11a... Flow rate control means, 12a, 17... Guide member, 13, 18...
Recovery section, 11... Recovery pipe, 15... Control electrode, 16... Recording paper, 19... Shaft.

Claims (1)

[Scope of Claims] 1. A multi-stylus recording stylus made of a magnetic material provided corresponding to a recording surface, a raised magnet that magnetizes the recording stylus and bulges a magnetic fluid at the tip of the recording stylus, and a flight control means for causing a magnetic fluid having a raised tip to fly to a recording surface in response to an image signal; a supply means for supplying the magnetic fluid to the tip of the recording stylus; and a flow rate control means for controlling the supply means. , comprising a guide member for guiding the flow of the magnetic fluid near the tip of the recording stylus, and a recovery section for recovering the surplus magnetic fluid supplied to the tip of the recording stylus by the operation of the supply means, guide member,
The flow rate control means extends from near the supply port of the supply means toward the recording needle at a predetermined interval along the surfaces of the raised magnet and the recording needle, and
A magnetic fluid recording device, wherein the supply means is set to eject the magnetic fluid from the supply port for a certain period of time before starting recording. 2. A magnetic fluid recording device according to claim 1, characterized in that the guide member is detachable. 3. A magnetic fluid recording device according to claim 2, characterized in that the guide member is separated at least during recording.