JPS6249390A - Magnetic recording printer - Google Patents

Abstract

PURPOSE:To form a magnetized latent image at a high speed by magnetizing a magnetic layer on a recording sheet in a single direction at first and then supplying current and heating a resistance layer on the recording sheet by a current supply electrode in accordance with a recording pattern to form a magnetized latent image. CONSTITUTION:The recording sheet 1 formed like an endless belt is fitted so that its magnetic layer 1a is turned to the outside and the magnetic layer 1a on the recording sheet 1 is magnetized by an eraser 3 in the single direction vertical to the sheet surface. Then, a voltage pulse is applied to the current supply electrode 2a in accordance with the recording pattern. At that time, the magnetic layer 1a of the sheet 1 is heated at its contact part with the current supply electrode 2a. After cooling, the heat-processed part is magnetized in the reverse direction by a magnetic field formed by a magnetic body on the peripheral unheated part. Since the current supply electrode 2a has a structure integrated with fine pitches and respective electrodes can be independently driven, subscanning can be electrically attained and the magnetized latent image can be rapidly formed only by traveling the recording sheet 1 and executing main scanning.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to a magnetic recording printer.

[Prior art and its problems]

Conventionally, in the magnetic recording method, a magnetized latent image is formed on the surface of a magnetic recording sheet formed in the shape of a belt or a drum, and the latent magnetized image is made visible using a magnetic ink toner. After the image is transferred to paper, the transferred visible image is fixed by a fixing device and recorded. At this time, a ring-type or stylus-type magnetic head is used as the recording head that forms the magnetized latent image. The most common method was to use A ring-type recording head has a coil wound around a ring-shaped core that has a gap in part.

When a current is passed through the coil, a magnetic flux is generated that passes through the core, but because the magnetic resistance is large in the gap, the magnetic flux spreads outward, and this leaked magnetic flux magnetizes the magnetic recording medium and performs recording. In addition, a stylus-type recording head has a coil wound around a stylus-shaped core. When a current is passed through the coil, a magnetic circuit is formed in the air or through the recording medium, and the magnetic flux density increases at the tip of the stylus. As the size increases, the magnetic recording medium is magnetized and recording is performed.

However, no matter which type of recording head is used, when forming a magnetic latent image, if there is only one recording head, the main scanning is performed mechanically by moving the recording head, the magnetic recording medium, or both. However, since it is necessary to perform sub-scanning, there is a drawback that it takes time to form a magnetized latent image. In order to eliminate this drawback, it has been proposed to make the head multi-head and shorten the time for forming a latent magnetized image. However, the production of the multi-head head itself is difficult, and the production of multi-heads with minute pitch intervals is extremely difficult. Not only is it difficult to manufacture the head, but even if it were possible to manufacture it, the cost of the head would be enormous.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks and provide a low-cost high-speed magnetic recording printer that can form a magnetized latent image at high speed and has a low cost recording head.

[Structure of the invention]

The present invention provides a belt-shaped recording sheet configured by laminating a magnetic layer and a resistor layer in the thickness direction, and a plurality of belt-shaped recording sheets that are arranged so as to be in contact with the resistor layer of the recording sheet and can be driven independently. a current-carrying electrode, a return electrode disposed in contact with the resistor layer of the recording sheet and insulated from the current-carrying electrode, and a magnetic latent image formed on the recording sheet that is made visible by magnetic ink toner. A developing device for forming an image, a transfer device for transferring the visible image onto a sheet of paper, a cleaner for removing ink toner remaining on the recording sheet after the transfer without being transferred, and the magnetic sheet.・It is characterized by having an eraser that magnetizes the magnetic material layer of the sheet in a single direction perpendicular to the sheet surface and erases the magnetized image, and a fixing device that fixes the visible image transferred to the paper. do.

[Effect]

According to the present invention, the magnetic layer of the belt-shaped recording sheet is magnetized by the eraser in a single direction perpendicular to the sheet surface, and the magnetized image is erased. After the magnetized image is erased, by independently driving a plurality of current-carrying electrodes according to the recording pattern, a current is caused to flow from the current-carrying electrode to the return electrode via the resistor layer of the recording sheet. Joule heat is generated because a current is passed through the resistor layer, and the magnetic layer of the recording sheet is heated by this Joule heat. When a magnetic layer is heated to a temperature at or just above the temperature of the magnetic material, the coercive force of the heated portion of the magnetic layer decreases or disappears, and after cooling, the coercive force of the surrounding unheated portion of the magnetic layer decreases or disappears. It is magnetized in the opposite direction by the magnetic field of the magnetic material, thereby performing sub-scanning.

Then, by running the recording sheet and performing main scanning, a magnetized latent image is formed on the recording sheet. This magnetized latent image is visualized by applying ink toner by a developing device, transferred onto paper by a transfer device, and fixed by a fixing device.

On the other hand, ink toner remaining on the recording sheet after transfer without being transferred is removed by a cleaner.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a plan view showing a recording process section according to an embodiment of the present invention. As shown in the figure, rollers 1 arranged in parallel
0 and the transfer roller 5a, there is an endless belt-shaped recording sheet 1 formed by laminating a magnetic layer and a resistive layer in the thickness direction.
is stretched with the magnetic layer facing outside. The recording head 2 is arranged inside the recording sheet 1 near the roller 10 so that the resistor layer of the recording sheet 1 comes into contact with the guide post 12 . Guide post 12 and transfer roller 5
A developing device 4 equipped with a lip 4a for adhering ink toner to the recording sheet 1 is disposed at an intermediate portion between the recording sheet 1 and the recording sheet 1.

A pressure roller 5b is arranged so that its roller surface contacts the roller surface of the transfer roller 5a, and between the transfer roller 5a and the pressure roller 5b, the recording sheet 1 and the paper 8 are superimposed. It is being pinched. This transfer roller 5
a and the pressure roller 5b constitute a transfer device 5. and,
On the exit side of the recording sheet 1 from the transfer device 5, a cleaner 7 having a roller 7a equipped with a brush and an eraser 3 are arranged in this order, and on the exit side of the paper 8 from the transfer device 5, a fixing device 6 is arranged.
is located.

The recording sheet 1 described above is constructed by laminating two layers, a magnetic layer 1a and a resistive layer 1b, in the thickness direction, as shown in FIG. Further, as shown in FIG. 3, the recording head 2 includes a plurality of current-carrying electrodes 2a, which are insulated by an insulating material 2c and arranged at equal intervals, and a return electrode 2b.
It is composed of. The plurality of current-carrying electrodes 2a can each be driven independently.

The operation of this embodiment will be explained below. A recording sheet 1 made in the shape of an endless belt is mounted with the magnetic layer 1a on the outside. First, the magnetic layer 1a of the recording sheet 1 is magnetized in a single direction perpendicular to the sheet surface by an eraser 3. Ru. FIG. 4(a) schematically shows the direction of magnetization at this time. Note that the arrow in the figure indicates the direction of magnetization.

Next, a voltage pulse is applied to the current-carrying electrode 2a according to the recording pattern. At this time, the current flows from the current-carrying electrode 2a through the resistor layer 1b of the recording sheet 1 to the return electrode 2b, but since the contact area of the current-carrying electrode 2a is smaller than that of the return electrode 2b, the current flows through the recording sheet. The current density of the flowing current increases around the current-carrying electrode 2a. The resistor layer 1b is
Since it literally has resistance, Joule heat is generated by the recording current, but the heat generation density of the generated Joule heat is proportional to the square of the current density, so the generated Joule heat is also concentrated around the current-carrying electrode 2a. do. Therefore, the contact point portion of the current-carrying electrode 2a of the magnetic layer 1a of the recording sheet 1 is also heated. When the magnetic material layer 1a magnetized in a single direction is heated to a temperature close to the Curie point of the magnetic material or above the Curie point, the magnetic material in the heated portion decreases or disappears in coercive force, so it is cooled. After that, it is magnetized in the opposite direction by the magnetic field created by the surrounding magnetic material in the unheated part. FIG. 4(b) schematically shows how the recording current flows and the direction of magnetization at this time.

As shown in FIG. 3, the current-carrying electrodes 2a have a structure in which they are integrated at a minute pitch, and each electrode can be driven independently. Therefore, sub-scanning can be performed electrically, and the recording sheet 1 can be moved. A magnetized latent image is formed at high speed simply by performing main scanning.

The magnetic latent image thus formed is visualized by applying magnetic ink, so-called toner, to the developing device 4. The visible image, that is, the ink toner image, is transferred onto the paper 8 by a transfer device 5 composed of a transfer roller 5a and a pressure roller 5b.

The ink toner image transferred to the paper 8 is melted and fixed by the fixing device 6. The toner remaining on the recording sheet 1 without being transferred is removed by the cleaner 7, and the same process is repeated again.

Next, another embodiment of the present invention will be described with reference to FIG. In this embodiment, when the recording sheet 1 is heated by the recording head 2, the magnetic layer of the recording sheet 1 is magnetized in the opposite direction to the direction in which the magnetic layer of the recording sheet 1 is magnetized by the eraser 3. A bias magnetic field smaller than the coercive force of the magnetic material constituting the magnetic material layer at room temperature is applied in the opposite direction to the direction in which the magnetic material is applied. As shown in the figure, a bias magnetic field generating magnet 9 is arranged to sandwich the recording sheet 1 between the recording head 2 and to face the recording head. Note that the parts not shown in FIG. 5 are the same as those in FIG. 1.

According to this embodiment, a bias magnetic field is generated in a direction perpendicular to the surface of the recording sheet 1 by the bias magnetic field generating magnet 9. When a bias magnetic field is applied,
Since the magnetic field of the heated part is stronger than when no bias magnetic field is applied, magnetization is performed in the opposite direction to the previously magnetized direction with less reduction in coercive force, that is, at a lower heating temperature. ... Fuser 7 ... Cleaner 8 ... Paper 9 ... Magnet for generating bias magnetic field Agent Patent attorney Yoshiyuki Iwasa Figure 1 Figure 2 Figure 3 Figure 5 (a) 2 To Kukofeng=-tI-” (b) Figure 4

Claims (2)

[Claims] (1) A belt-shaped recording sheet configured by laminating a magnetic layer and a resistor layer in the thickness direction, and a plurality of energizers that are arranged so as to be in contact with the resistor layer of the recording sheet and can be driven independently. an electrode, a return electrode disposed in contact with the resistor layer of the recording sheet and insulated from the current-carrying electrode, and a magnetized latent image formed on the recording sheet as a visible image with a magnetic ink toner. a developing device for transferring the visible image onto paper; a transfer device for transferring the visible image onto the paper; a cleaner for removing ink toner remaining on the recording sheet after transfer without being transferred; A magnetic recording type characterized by having an eraser that magnetizes a magnetic layer in a single direction perpendicular to the sheet surface and erases the magnetized image, and a fixer that fixes the visible image transferred to the paper. printer. (2) To apply a bias magnetic field, which is smaller than the coercive force of the magnetic material at room temperature, to the point of contact between the recording sheet and the current-carrying electrode in the opposite direction to the direction in which the magnetic material layer of the recording sheet is previously magnetized by the eraser. 2. A magnetic recording printer according to claim 1, further comprising a bias magnetic field generating magnet.