JPS6245995B2 - - Google Patents

Abstract

PURPOSE:To miniaturize a latent-image forming device by reducing the arrangement space of parts, by installing a magnet for bias magnetic field application in the case of a thermal printing head. CONSTITUTION:Magnetic medium 3 magnetized in a uniform saturation pattern is heated, according to record, by heating element 11 provided onto support substrate 12 of case 7 above the temperature of the curie point of compensation point to erasing the magnetism of the heated part. Next, the biasing magnet 5, etc., installed in case 7 magnetizes the heated part in the opposite direction, etc., to the saturation pattern to form a magnetic latent image. The thermal printing head consisting of the heating element and biasing magnet in a body with the small arrangement space of parts is used to miniaturize the magnetic latent-image forming device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording device that forms a magnetic latent image on a magnetic medium, and particularly to a magnetic recording device that forms a magnetic latent image on a magnetic medium at a desired location (recorded portion or non-recorded portion) having a uniform magnetization pattern. The present invention relates to a magnetic recording device that forms a magnetic latent image of a recorded image on a magnetic medium by selectively heating the heated portion and making the magnetization pattern of the heated portion different from that of other portions.

In conventional magnetic recording devices of this type (called magnetic photography or magnetography), information is written on a magnetic medium by inverting the magnetization of a desired area of the magnetic medium, which has a uniform magnetization pattern, using a magnetic head. Ta. For this reason, in order to perform line-by-line writing at a density of approximately 10 lines/mm, it is necessary to arrange approximately 1,000 to 2,000 magnetic heads. Due to its structure, it was extremely difficult to manufacture.

In order to improve the drawbacks of the prior art as described above, the present inventors selectively locally heat desired locations of a magnetic medium having a uniform magnetization pattern above its Curie point or compensation point temperature, In a magnetic recording device that forms a magnetic latent image on a magnetic medium by making a magnetization pattern of a heated portion different from that of other portions, the magnetic medium heating means is arranged one-dimensionally on a support substrate and thereon. The printing head consists of a thermal printing head consisting of a large number of heating elements, and a device that selectively supplies heating current to each heating element depending on the image information to be recorded. He proposed a magnetic recording device configured to generate local heating (Japanese Patent Application Laid-open No. 115278/1983).

The present invention further improves the above proposal and attempts to make the entire apparatus compact, by integrating a thermal printing head and a bias magnetic field means.

FIG. 1 shows a schematic configuration of an embodiment of the present invention.
In the figure, 1 is a thermal printing head consisting of a support substrate 12 and a large number of heating elements 11 arranged one-dimensionally (perpendicular to the plane of the paper) on the support substrate, and 5 is a bias magnet arranged on the lower surface of the support substrate 12. , 7 are these cases, and 4 is a counter roll arranged to face the thermal printing head 1 and sandwich the magnetic medium 3 therebetween.

As the thermal printing head, what is conventionally known as a thermal recording head, that is, one consisting of a support substrate and a number of heating elements arranged one-dimensionally on the support substrate, can be used almost as is. It is. Of course, means for selectively supplying a heating current to each heating element in accordance with the image signal to be recorded is also required, but a means for a thermal recording head can also be used.

Information writing in this embodiment is performed as follows. As a preliminary treatment before recording, the magnetic medium 3 is saturated magnetized in the thickness direction or in-plane direction to form a uniform magnetization pattern. When the magnetic medium 3 comes directly under the thermal printing head 1, it is locally selectively heated by selected heating elements 11. The temperature of the heated portion becomes higher than the temperature of the Curie point or compensation point of the magnetic medium, and the magnetization of the heated portion disappears.

When the current supply to the heating element 11 is interrupted, the temperature of the magnetic medium 3 decreases. When the temperature reaches below the Curie point or the compensation point, the bias magnet 5
magnetized by the magnetic field of The bias magnet 5 is
A magnetic field in a direction different (for example, in the opposite direction) from the preliminary magnetization is applied to the magnetic medium 3. Therefore, the heated portion of the magnetic medium 3 is magnetized in a direction determined by the magnetic field of the bias magnet 5, and a magnetization pattern different from the pre-magnetization (for example in the opposite direction) is formed on the magnetic medium 3, which It becomes a latent image.

As described above, according to the present invention, the magnet 5 for the bias magnetic field is housed behind the support substrate 12 in the case 7 of the thermal printing head 1, so the space for arranging components can be small, and the entire device can be made compact. It can be configured compactly.

In addition, if the magnet 5 is made rotatable around the axis 6 in FIG. 1, the direction of the bias magnetic field can not only be changed arbitrarily, but also it can be used to form a uniform magnetization pattern on a magnetic medium. become. Further, if the magnet 5 inside the opposing roll 4 shown in FIG. 1 is an electromagnet and the polarity can be arbitrarily reversed, it is possible to both form and record a uniform magnetization pattern on a magnetic medium.

FIG. 2 shows another embodiment of the present invention, in which a yoke material 8 is housed inside the opposing roll 4 in the embodiment shown in FIG. It is something.

FIG. 3 shows yet another embodiment of the present invention, in which a horseshoe magnet 5A is used in place of the bias magnet 5 in the embodiment of FIG. In this case, the magnetic field applied to the magnetic medium 3 becomes an in-plane magnetic field.

It is clear that the same effects as in the case of FIG. 1 can be obtained in FIGS. 2 and 3 as well. Further, in each of the above embodiments, the opposing roll itself may be made of a magnetic material. Furthermore, if the opposing roll 4 is a heat roll and the magnetic medium 3 is preheated,
The energy applied to the heating element 11 can be reduced, and the recording speed can be increased. Note that in the above, opposing rolls are not necessarily necessary.
It can also be omitted.

[Brief explanation of the drawing]

1 to 3 are schematic configuration diagrams showing embodiments of the present invention, respectively. 1...Thermal printing head, 3...Magnetic medium, 4...
Opposed roll, 5... Bias magnet, 7... Case, 11... Heat generating element, 12... Support substrate.

Claims (1)

[Claims] 1. By selectively locally heating a desired location of a magnetic medium having a uniform magnetization pattern to a temperature higher than its Curie point or compensation point temperature, and making the magnetization pattern of the heated location different from other locations, In a magnetic recording device that forms a magnetic latent image on a magnetic medium, the magnetic medium heating means includes a thermal printing head consisting of a support substrate and a number of heating elements arranged one-dimensionally on the support substrate, and image information to be recorded. In response to the,
A magnetic latent image characterized by comprising a device for selectively supplying a heating current to each heating element, and a bias magnet that is integrally fixed to the support substrate and applies a bias magnetic field to a heated portion of the magnetic medium. Forming device.