JPS587354A - Magnetic fluid recorder - Google Patents

Abstract

PURPOSE:To wash out the condensed magnetic fluid quickly and permit the recording of stable picture quality by a method wherein the magnetic fluid of more amount than the amount thereof upon recording is supplied for a predetermined period of time before the beginning of the recording to the tip of a multi- stylus recording needle. CONSTITUTION:A supply pump 7 is operated by a flow amount controlling means 11a for the predetermined period of time before the beginning of recording, and the magnetic fluid 8 is blown out of the vicinity of the tip of the recording needle 1. The magnetic fluid 8 is flowed along the slope of the magnet 3 for protrusion and the recording needle 1 by providing a guide member 12a at the vicinity of the tip of the recording needle 1, and the condensed magnetic fluid, adhered to a supply port B and the vicinity of the tip of the recording needle 1, may be washed out in a short time.

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 onto a recording paper surface by applying a Coulomb force. This relates to a magnetic fluid recording device that obtains prints, by quickly removing the magnetic fluid that is concentrated near the tip of the stylus due to magnetic field and evaporation when the stylus is stopped, before starting flight recording, and forming ridges with unconcentrated magnetic fluid. , to obtain stable image quality.

A conventional magnetic fluid recording device FIGS. 1 to 3.

Explain using.

A plurality of recording needles 1 are made of a magnetic material and are arranged on a substrate 2 at equal intervals. A raised magnet 3 is adhered onto the recording needle 1, and a slit magnet 4 is further provided to form a magnetic fluid holding section 5. A storage section 6 is provided behind the magnetic fluid holding section 6, and the magnetic fluid holding section 6 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 6, and with the operation of the supply pump 7 stopped, an appropriate bulge is formed on the tip of the recording needle 1, and the magnetic fluid 8 is supplied by the supply pump 7.
The recording needle 1 and the storage section 6 are arranged so that the magnetic fluid 8 is automatically supplied according to the consumption of the magnetic fluid 8 even when there is no supply of the magnetic fluid 8.
The head difference H between the liquid level and the liquid level is taken. The control means 9 applies a Coulomb force to the magnetic fluid 8 held at the tip of the recording needle 1 to cause it to fly. As shown in FIG. 3, when recording is stopped, the magnetic fluid 8 attached and held near the tip A of the recording stylus 1 and the supply port B is connected to the raised magnet 3 and the slit. Magnet 4 JP-A-58-73
54 (2) The magnetic field concentrates due to the force, and the solvent evaporates and concentrates, resulting in poor fluidity (no magnetic fluid is supplied as the magnetic fluid 8 is consumed even after recording starts). In this case, only the magnetic fluid 8 held at the tip of the recording stylus 1 flew away, making it impossible to print after that.In severe cases, the magnetic fluid 8 held at the tip of the recording stylus 1 did not fly at all, making printing impossible.

The present invention eliminates such drawbacks and provides 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. 6 is a recording device which is another embodiment of the present invention. It is a block diagram of a device.

A plurality of recording needles 1 are made of a magnetic material and are arranged on a substrate 2 at equal intervals. A raised magnet 3 extending over the entire array width of the recording needle 1 is bonded onto the recording needle 1 so as to magnetize the recording needle 1 and raise a magnetic fluid 8 at the tip of the recording needle 1. Reference numeral 5 denotes a holding portion for holding the magnetic fluid 8, in which the slit magnet 4 is fixed so as to face the raised magnet 3, and a portion thereof is connected to the supply pipe 1o. The slit magnet 4 is fixed to the holding portion 6 so as to extend opposite to the raised magnet 3 and constitute a supply port B sandwiched between both magnets. Also, a raised magnet 3, a slit magnet 4, and magnetic shield plates 11 and 12 with high magnetic permeability are provided inside the holding part 6, respectively, to apply magnetic force to the magnetic fluid 8 inside the holding part 6. This structure prevents the magnetic fluid 8 from concentrating in the magnetic field within the holding section 6. One end of the supply pipe 1o is connected to the holding section 6, and the other end is connected to the storage section 6 that stores the magnetic fluid 8.

A supply pump 7 is also provided in the middle. Reference numeral 11a represents a flow rate control means for operating and stopping the supply pump 7.

12& is a guide member that guides the direction in which the magnetic fluid 8 flows near the tip of the recording stylus 1, and 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 6 at intervals. Reference numeral 13 denotes a recovery section that recovers the surplus magnetic fluid 8 supplied by the supply pump 7, and a recovery pipe 14 is connected to a part of the recovery section.
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 apply a Coulomb force to the magnetic fluid 8 raised at the tip of the recording needle 1, as shown in FIG. The particles are activated to fly onto the surface of the recording paper 160.

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.
The head difference H' between the liquid level in the reservoir 6 and the tip of the recording stylus 1 is adjusted so as to obtain an appropriate protrusion having a height, and the reservoir 6 is held by an appropriate 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, is balanced without being cut, and only the consumed amount is transferred to the supply pipe 1.
0, it passes through the supply pump 7 and is automatically replenished. When the flight control means 9 applies a voltage between the recording needle 1 and the control electrode 16 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 moves toward the recording paper 16. can fly toward the surface and record images. When recording is completed, paused for a certain period of time, and then recorded, a certain rule before starting recording, flow control means 1
111, the supply pump 7 is operated to blow out the magnetic fluid 8 from near the tip of the recording needle 1. The blown out magnetic fluid 8 passes through the recovery section 13 and recovery pipe 14 to the storage section 6.
is flowing into the country. The flow of the magnetic fluid 8 when the supply pump is activated and the magnetic fluid 8 is blown out before the start of recording is shown in the seventh diagram.
As shown in FIG. In the conventional recording apparatus shown in FIG. 7, the concentrated magnetic fluid 8A adhering to the supply port B is washed away due to magnetization without the guide member 12a, but the part A near the tip of the recording needle 1 is washed away. It is necessary to blow out the magnetic fluid 8 for a long time in order to wash away the concentrated magnetic fluid 8A adhering to the magnetic fluid 8A. However, as shown in FIG. 8, by providing the guide member 12 near the tip of the recording needle 1, the magnetic fluid 8 flows along the slope of the raised magnet 3 and the recording needle 1. The concentrated magnetic fluid 8A adhering to the vicinity of the tip of the magnetic fluid 8A can be washed away in a short time. As described above, by blowing out the magnetic fluid for a certain period of time before starting recording, the magnetic fluid 8A is concentrated near the supply port and the tip of the recording needle 1 by magnetic force and evaporation when the recording is stopped.
The magnetic fluid 8 is quickly washed away, a magnetic fluid 8 without concentration is introduced, and a bump is formed with the magnetic fluid 8 without concentration to perform recording.

Although the guide member 12a is fixed in the explanation in FIG. 4, the guide member 12a may be configured to be detachable so that the guide member 12a is separated when recording or cleaning the head section with cloth, paper, etc. The same effect can be obtained. When recording and cloth.

FIG. 6 shows an embodiment in which the guide members are separated when cleaning the head section with paper or the like. In the figure, reference numeral 17 denotes a removable guide member, which is fixed to the collecting section 18. Collection section 18
is provided to be able to freely open and move around the shaft 19, and includes an opening control means (
(not shown) or manually. The control electrode 16 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 that has adhered to the vicinity of the tip of the recording needle 1 due to the blowout of the magnetic fluid, move the collecting section 18 toward the recording needle 1 as shown by the solid line in FIG. A guide member 17 is formed near the recording needle 1, and the control electrode 15 and 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 collection part 18 and the guide member 17 are separated from the recording needle 1, and the control electrode 16 and the recording paper 16 are brought closer to the recording needle 1, and the concentration is started. Recording 0 is performed by forming a bump with the magnetic fluid 8 that does not contain the magnetic fluid.

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 proper 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 drawings]

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 same device, FIG. 4 is a schematic configuration diagram of a magnetic fluid single body recording device which is an embodiment of the present invention, and FIG. 6 is an enlarged view showing the bulge shape of the tip of the recording needle of the same device. 8 are explanatory diagrams 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...board board 3...
... Raised magnet 14 ... Slid magnet
6... Holding section 16 , Storage section 7
, , , , Supply pump , 8 , , . 00000. Magnetic fluid, 9, Flight control means, 100600. Supply pipes, 11, 12,...
, , Magnetic shield plate, 11 a , , , Flow rate control means, 12 a. 17 , , , guide member , 13 , 18 , , ,
,,Recovery section, 11, ,Recovery pipe, 15,
,,,,control electrode, 16...recording paper 119.
... Name of axis 0 agent Patent attorney Toshio Nakao and one other person Figure 1"" @311 1I11-4 Figure 6 Figure 7 A

Claims (1)

[Scope of Claims] (1) A multi-stylus recording stylus made of a magnetic material provided corresponding to the recording surface, a raised magnet that magnetizes the recording stylus and bulges a magnetic fluid at the tip of the recording stylus; a flight control means for causing a magnetic fluid raised at the tip of a needle 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 needle; and a supply means for reducing the supply capacity of the supply means. a flow rate control means that can be switched and adjusted in two stages; a guide member that guides the flow of the magnetic fluid near the tip of the recording stylus; and a surplus supplied to the tip of the recording stylus by the operation of the flow rate control means. and a collection section for collecting the magnetic fluid, the guide member being inserted into the recording needle from near the supply port of the supply means substantially parallel to the surface of the raised magnet and the recorder at a predetermined interval. , and the flow rate control means is set such that the supplying capacity of the supplying means is small (for a certain period of time before the start of recording, larger than the supplying capacity during recording). Recording device. (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 detachable. A magnetic fluid recording device characterized in that a guide member is spaced apart during recording.