JPS61252166A - Ordinary paper recorder - Google Patents

Abstract

PURPOSE:To ensure that no magnetic field is generated at non-recording time, an ink is not adhered to a nozzle tip part, a magnetic powder is prevented from being precipitated and a meniscus is formed only at the time of recording, by a system wherein a coil wound around a magnetic material nozzle having a small diameter through-hole and partially immersed in a magnetic ink is connected to a power source through a switch, and the switch is turned ON and OFF according to a picture signal. CONSTITUTION:Where the switch 4 is open and no electric current is supplied to the coil 3, only the nozzle 1 is immersed in the magnetic ink 8, and the ink is not adhered to the nozzle tip part or the outer periphery of the nozzle above the liquid level L of the ink. However, the liquid level L' of the ink in the small hole 2 of the nozzle is higher than the liquid level L in the exterior of the nozzle, due to capillarity. With the switch 4 turned ON, a magnetic field is generated to magnetize the nozzle, whereby the magnetic ink is attracted. The magnetic field is generated also in the small hole of the nozzle, so that the magnetic ink is attracted upward to form a meniscus 12 at a tip part A. At the time of recording, the power source 11 is so operated that an electric field is constantly generated between the nozzle and a counter electrode, whereby the ink is instantaneously driven to fly toward a recording member 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plain paper recording device using magnetic fluid suitable for use in blocks such as printers and facsimile machines.

Conventional 1 Avoidance Conventionally, in a recording method that obtains images using ink made of magnetic fluid, a permanent magnet is used to form a meniscus of magnetic ink at the tip of a magnetic stylus, and a flying voltage is applied between the magnetic ink and the opposing electrode. It is known to selectively cause magnetic fluid to fly by switching (high voltage) to obtain a visible image on recording paper. However, since such conventional recording methods use ordinary permanent magnets, the magnetic field remains strong against the magnetic ink, resulting in ink always being attached to the stylus, and the tip of the stylus constantly being exposed. A meniscus was formed.

As a result, magnetic powder tends to settle near the stylus.
Change in meniscus shape.

Problems such as insufficient ink supply and inability to fly can easily occur, and since a meniscus is constantly formed, there are numerous problems such as erroneous flight due to adjacent electrodes and the need for high-voltage, high-speed switching. Ta.

nm The present invention has been made in view of the above-mentioned circumstances, and is intended to be used in a recording device that obtains images using magnetic ink. An object of the present invention is to provide a plain paper recording device that does not require voltage switching.

In order to achieve the above object, the present invention connects a coil wound around a magnetic nozzle having a through hole partially immersed in magnetic ink to a power source via a switch, and connects a recording member to a power source through a switch. A voltage is applied between the magnetic nozzle and a counter electrode disposed on the opposite side of the magnetic nozzle, and the switch is turned on and off in accordance with an image signal. . Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a diagram showing the overall configuration of a recording device according to the present invention.
In the figure, 1 is a small diameter nozzle made of a magnetic material, and a hole 2 passes through it in the length direction. 3 is a coil wound around the small diameter nozzle 1, which is turned on according to the image signal.

It is connected to a power source 5 via a switch 4 that is turned off. 6 is a resistor for limiting the current flowing through the coil 3. The container 7 is filled with magnetic ink 8, and the nozzle 1 is partially immersed therein. A recording member 9 is provided with a counter electrode 10 on the side opposite to the nozzle, and a power source 11 is connected between the nozzle 1 and the counter electrode 10.

Next, the operation of the recording apparatus shown in FIG. 1 will be explained with reference to FIGS. 2 and 3.

First, as shown in FIG. 3, when the switch 4 is turned on and a current is passed through the coil 3, a magnetic field is generated as shown in the figure, and the strongest magnetic field is usually generated at both ends.

FIGS. 2(a) and 2(b) show how a meniscus is formed at the tip A of the nozzle 1 due to the generation of this magnetic field. In FIG. 4A, the switch 4 is open and no current is supplied to the coil 3. In this case, the nozzle 1 is only immersed in the magnetic ink 8, and no ink is attached to the tip of the nozzle or the outer periphery of the nozzle above the ink liquid level. However, the ink liquid level L° inside the nozzle small hole 2 is higher than the liquid level outside due to capillarity. This is important in terms of improving ink supply performance. In the figure (b), the switch 4 is turned on and off, current is supplied to the coil 3, and a magnetic field is generated. In this case, the nozzle is magnetized and attracts magnetic ink. A magnetic field is also generated within the small hole of the nozzle, and the magnetic force becomes stronger toward the tip, so the magnetic ink is pulled up and forms a meniscus 12 at the tip A. During recording, an electric field is constantly generated between the nozzle and the opposing electrode by the power source 11 in FIG. be exposed.

As is clear from the above description, according to the present invention, an electromagnet is used to supply magnetic ink and form a meniscus to turn on and off the magnetic field, and the ink liquid inside the nozzle hole is Since the surface is raised to some extent and the flying voltage is always ON during recording, (1) there is no magnetic field when not recording, and basically there is no ink adhesion at the tip of the nozzle. , it is possible to prevent the negative effects caused by magnetic powder precipitation.

(2) Since a meniscus is formed only during recording, erroneous flight due to adjacent electrodes can be prevented.

(3) The ink supply performance is good because the liquid level inside the nozzle is raised to a certain level.

(4) High-voltage flying voltage switching is not required, and the circuit configuration and electrode configuration are easy.

(5) A recording device with a simple configuration, small size, and low cost can be realized.

A great effect can be achieved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a recording device according to the present invention, and FIG.
The figure shows the state of meniscus formation, and FIG. 3 shows the state of magnetic field generation. 1... Magnetic nozzle, 2... Small hole, 3... Coil,
4... Switch, 5.11... Power source, 6... Resistor, 7... Container. 8... Magnetic ink, 9... Recording member, 10... Counter electrode. 12...Meniscus.

Claims (1)

[Claims] A coil wound around a magnetic nozzle having a through hole partially immersed in magnetic ink is connected to a power source via a switch, and an opposing coil is placed on the opposite side of the magnetic nozzle with the recording member in between. A plain paper recording device characterized in that a voltage is applied between an electrode and the magnetic nozzle, and the switch is turned on and off in accordance with an image signal.