JPS5816276A - Magnetic recording method - Google Patents

Abstract

PURPOSE:To obtain images with high density and high resolution by using an endless magnetic body which has a vertical magnetic anisotropic layer, forming a magnetic latent image through a magnetic head, and magnetically transferring a developed visible image from the lower part of a latent image side. CONSTITUTION:On an endless nonmagnetic material layer 12, a magnetic recording body 10 having a high density vertical magnetic anisotropic layer 13 is supported through a roller 11 and while the layer 13 is set on the internal circumferential side, the recording body is moved as shown by an arrow. A magnetic head 14 is provided in contact with the vertical magnetized layer 13 and at the lower part of its external circumferential side, a developing device 15 is provided. The magnetic head 14 forms a high density latent image on the layer 13. While this latent image is put in disorder, a magnetic developer 17 is applied over the nonmagnetic layer 12 by a roll 16 to obtain a visible image. The image is transferred by a transfer roll 21 to transfer paper fed at prescribed timing and is fixed by a fixing roll 22. The magnetic recording body 10 is cleaned by an erasing head 23 and is used repetitively.

Description

[Detailed description of the invention] The present invention relates to a magnetic recording method.

Conventionally, there are magnetic recording means as shown in FIG. In other words, a magnetic drum (1) rotating in the direction of the arrow
A magnetic latent image is formed by a magnetic writing head (2), and this magnetic latent image is developed by a magnetic toner (4) of a developing device (3) to form a visible image, and then this visible gJ is transferred to a transfer roller. (5) is used to transfer the image onto the transfer paper (6). A cleaning device (7) and an erasing head (8) are provided for the magnetic drum (1) after the transfer.

However, in this method, it is necessary to place the magnetic writing head (2) in contact with the magnetic drum (1) or with a very small gap, but the magnetic toner moves on the surface of the magnetic drum (1). If the magnetic toner remaining on the magnetic drum (1) after transfer is not completely removed, the magnetic writing head (2) will become stained and worn, resulting in a decrease in image quality. For this reason, a cleaning device is required to perform cleaning with completeness, and a simple device cannot be used.

Further, in the case of the magnetic recording method, one of the advantages is that the magnetic latent image is extremely stable, so that a large number of copies can be made with the same magnetic latent image.

In order to take advantage of this advantage, it is necessary to make the length of the magnetic drum (1) longer than the length of the document in Figure 1, but since all the members are arranged around the length of the magnetic drum (1), the device becomes larger. I'll put it away.

Further, when forming a magnetic latent image on a recording medium, a longitudinal magnetization method and a perpendicular magnetization method are known. FIG. 2 shows this magnetization method, and the arrow in the figure indicates the direction of magnetization in the recording weight (9). First, (a) shows low-density longitudinal magnetization, which uses permanent magnets that occur in the longitudinal direction of the disk or tape. In other words, the demagnetization effect increases as the width of the magnet increases relative to the length of the magnet.On the other hand, in the same figure (→ indicates low-density perpendicular magnetization) This method creates a magnet in the thickness direction of the recording medium (9), and when high-density perpendicular magnetization is performed as shown in Figure (d), the higher the density, the less the demagnetization effect and the stronger the magnet. Therefore, the perpendicular magnetization method can form a magnetic latent image with higher density, stability, and resolution.

The present invention has been developed in view of these points, and while adopting a perpendicular magnetization method, even a simple leaning method does not affect the magnetic head, and it is possible to always obtain stable, high-quality images. The object is to provide a magnetic recording method.

The present invention employs a perpendicular magnetization method using a magnetic recording body having a perpendicular magnetic anisotropic layer, and by making this magnetic recording body in the shape of an endless strip and making the magnetic latent image forming surface and the developing surface different, residual magnetism is eliminated. The magnetic head is not affected by the developer at all, so even if a simple leaning method is used, a stable high-quality image can always be obtained.

An embodiment of the present invention will be described based on FIG.

This embodiment is applied to a magnetic printer, and FIG. 3 shows an apparatus for implementing this method. First, an endless strip-shaped magnetic recording body αQ is provided so as to move in the direction of the arrow while being supported by a plurality of rollers αη. here,
The magnetic recording body α0 is perpendicularly magnetized, and has a two-layer structure consisting of a non-magnetic layer (b) and a perpendicular magnetic anisotropy layer (g), as shown in Figure 4. The sexual layer (to) is located on the inner circumferential side. Specifically, a non-magnetic layer (6) is formed with a thickness of about 10 to 50 μm using a non-magnetic metal such as copper or phosphor bronze, or a resin such as polyimide or polyester, and a non-magnetic layer (6) is formed on this non-magnetic layer (6). A C0-Cr crystal film (Cr content: 10 to 20 cLt%), Tl)-pe amorphous film (Tb content: 10 to 20 αt%), etc. are formed to a thickness of 500X by sputtering or the like to create perpendicular magnetic anisotropy. It is assumed to be a tropic layer α field. This magnetic thin film can also be formed by a vapor deposition method, an ion plating method, a plating method, etc. Also, a protective layer of Sin, etc. may be provided to protect the perpendicular magnetic anisotropic layer α. . In any case, the magnetic material forming the perpendicular magnetic anisotropy layer (6) has a hysteresis curve of the magnetic characteristic curve
As shown in the figure, it is rectangular, but its saturation magnetization is 4πM8
It is desirable that the magnetic field is 1000 Gauss or more, and the coercive force Hc is about several hundred oersteds. The larger the saturation magnetization Ms, the larger the S/N during recording, and the larger the coercive force Hc, the greater the energy required for recording. On the other hand, if the coercive force He is too small, it is easily affected by noise magnetic fields. Because it will be.

For such a magnetic recording body (G), first, a magnetic head α♦ is provided on the inner peripheral side in contact with or in close proximity to the perpendicular magnetic anisotropic layer a1. And this magnetic head α
A developing device (g) is provided at the lower part of the outer circumferential side of the magnetic recording body αQ facing ◆. This developing device (G) consists of a developer supply roller 0→, a magnetic developer αη, and a large open container 0. The magnetic developer αη is a magnetic powder developer,
Any magnetic fluid may be used. Also, developer supply roller 0
The magnetic force of Q should not be too strong so as not to disturb the magnetic latent image recorded on the magnetic recording body αO. When a magnetic fluid is used, it is preferable to supply the magnetic developer α25 with a magnetic roller having a porous elastic layer on its surface. Next, a transfer roller (2) is provided which is positioned on the outer circumferential side in the same way as the developing device 0 and which performs a transfer operation on the transfer sheet fed by the paper feed roller (II).This transfer roller A fixing device () is provided outside of eη (the drawing shows a fixed eyebrow roller of heating or pressure type). Furthermore, an erasing head (to) is provided at the inner circumferential side like the magnetic head α. This erasing head (to) is the container α of the developing device α.
The frame is placed over the opening.

In such a configuration, an image signal is first applied to the magnetic head α◆, and a magnetic latent image corresponding to the image signal is transferred to the magnetic recording body α1.
to form. That is, a magnetic latent image is formed by the perpendicular magnetization of the perpendicular magnetic anisotropic layer [alpha], and a stable magnetic m-image with high density can be formed. At the same time as this magnetic latent image is formed, a magnetic developer α is applied to the non-magnetic layer α side.
η is supplied to develop the magnetic latent image into a visible image 17 (although it goes without saying that it may be developed not at the same time as the formation of the magnetic latent image but at a later position). After that, the non-magnetic layer (
6) The above visible image is transferred to a transfer paper sheet fed at a predetermined timing by a transfer roller 01), and then transferred to a fixing device (c).
It becomes established.

On the other hand, the magnetic latent image on the perpendicular magnetization oriented layer blade 1 is erased by the erasing head for the magnetic recording body α1 after the transfer, in preparation for the next recording. Here, there may be residual developer on the surface of the magnetic recording body α1 between the erasing head), but when the magnetic latent image is erased by the erasing head), a binding force is exerted on the opposing residual developer. Since it has almost no effect, it can be removed from the magnetic recording body α4 without the need to provide any particular cleaning device. In particular, magnetic recording medium α
Since the erasing head (c) is installed at a position where the 0 surface becomes a vertical surface or a lower surface, and is located above the opening of the container 0→, the remaining developer is removed by magnetic latent image erasing and is removed directly by falling or dropping. The developer can be collected into the container marked 0 by the magnetic force of the developer supply roller αQ in the developing device (G).

In addition, when obtaining multiple copies from the same magnetic latent image, it is possible to develop and develop only the required number of copies without performing the erasing process using the erasing head (c) and the recording process using the magnetic head α◆ in the post-transfer process. It is only necessary to repeat the transfer/fixing process. In this case, the length of the magnetic recording body α1 must be greater than the original size, but unlike the drum system shown in FIG.
, erasing head) are arranged on the inner circumferential side, so that the apparatus can be made compact. This point is also more effective in that recording and development can be performed at the same time.

In any case, according to the present recording method, the recording process is performed with the surface on which the magnetic latent image is formed by the magnetic head α and the surface developed by the developing device (g) different.
Even if there is residual developer on 10, it has no effect on the magnetic head α◆, and therefore, the magnetic recording body (which is placed in contact with or close to 10) does not stain or wear out the fc magnetic head α→, making it easy to use. Even with a leaning method, ie, a residual developer removal method based on erasing with an erasing head as shown in the embodiment, a stable and high quality image can always be obtained.

Note that the recording method of the present invention can be applied not only to plain paper printers but also to facsimile machines and the like.

As described above, the present invention takes advantage of the perpendicular magnetization method that can form a high-density and stable magnetic latent image by using a magnetic recording body having a perpendicular magnetic anisotropy layer. Since each process is carried out with the magnetic latent image forming surface and the developing surface different, even if there is residual developer on the magnetic recording medium, there is no effect on the magnetic head. Even with this method, stable, high-quality images can always be obtained, and even when the device is manufactured, it can be made more compact by arranging some of the constituent members internally.

[Brief explanation of drawings]

Fig. 1 is a side view showing the entire conventional example, Fig. 2 (•) to (d) are explanatory views showing the magnetization method, Fig. 3 is a side view showing an embodiment of the present invention, and Fig. 4 is the - FIG. 5 is a side view showing an enlarged view of S, and FIG. 5 is an explanatory diagram showing a magnetic characteristic curve. 10... Magnetic recording body, 12... Nonmagnetic layer, 13.
... Perpendicular magnetic anisotropy layer, 14... Magnetic head, 17.
...Magnetic developer, 20...Transfer paper (transferred material) July 22, 1980 Applicant Ricoh Co., Ltd. =2--
,111

Claims (1)

[Claims] A magnetic latent image is formed on an endless strip-shaped magnetic recording body having a non-magnetic layer and a perpendicular magnetic anisotropic layer from the perpendicular magnetic anisotropic layer side using a magnetic head, and this magnetic latent image is transferred to the non-magnetic layer side. 1. A magnetic recording method characterized in that the visible image is transferred to an object after being developed with a more magnetic developer.