JPS5874362A - Recording head for thermomagnetic writing - Google Patents

Abstract

PURPOSE:To provide a titled heat which can reduce a total size of a device, by a method wherein a bias magnetic field for applying a magnetizing pattern to a magnetic recording medium and a thermal head acting as a heating means are united monolithically. CONSTITUTION:A magnetic head 1, serving as a bias magnetic field applying part, is formed into a long-sized head measuring 257mm. or more in a short side of B4 size. A 78% permalloy is used as a core material, a winding 2 is formed with an enamelled copper wire wound 500 times, and is connected to an AC power source. A heating resistor 4 is embedded in a gap in the magnetic head, and is formed in a long size to unite the resistor and the magnetic head monolithically. A magnetic field applying and a heat applying can simultaneously be performed on a recording medium from the samd side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording head that forms a magnetic I11# image on a magnetic recording medium, and in particular, applies uniform magnetization and lean while simultaneously selecting a recording section or a j1 recording section. The present invention relates to a recording head F for thermal magnetic dispersion in which a magnetic latent image of a recorded image is formed on a magnetic recording medium by heating the heated area and making the magnetization pattern of the heated area different from that of other areas.

Conventionally, this magnetic recording device was called a magnetic recording device, and a magnetic head was mainly used to convolute information onto a magnetic recording medium.However, when using an 8-ki head, only one magnetic head was used. If writing is done with a magnetic head, the latent image formation time will be long. Even if the magnetic recording medium is made into a drum shape and is rotated at high speed, the amount of time required to form a latent image will be approximately 50
It takes seconds. Another disadvantage is that the apparatus becomes complicated and expensive due to the necessity of high-speed rotation and sub-scanning. In addition, a large number of magnetic heads are arranged in parallel along the width of A4 to B4. A so-called long multi-magnetic spatula r has also been proposed, but this requires arranging 2000 or more magnetic heads in parallel, making it extremely difficult to manufacture.
□'Furthermore, a specific part of the magnetic recording device having a uniform magnetization pattern is selectively heated to a temperature above the Curie point or the compensation point, and the magnetic 11! # In the magnetic recording device that forms our system, a means for providing uniform miniaturization and reeling to an i-air recording medium, a high-intensity magnetic field, and a thermal spatula F as a heating means are required. In conventional devices, all of these means are constructed independently, leading to an increase in size and complexity of the device.

Further, in the conventional apparatus, due to its structure, the bias magnetic field applying means and the thermal spatula F face each other with the magnetic recording medium in between. This configuration has one side directly facing the base layer of the media (usually a plastic film).
Considering the thickness of the base layer, either the bias magnetic field or the heat from the thermal head was not applied sufficiently, and when an image was printed, the image density was 1.0 or less.

In order to eliminate and improve the drawbacks of the prior art described above, the present invention integrates a bias magnetic field as a means for providing a magnetization pattern to a magnetic recording medium and a thermal head as a heating means, thereby making the entire device more compact. This is the purpose.

The above purpose is to form a heating resistor in or near the air gap of a bias magnetic field application head in a magnetic recording spatula r that forms a magnetic latent image on a magnetic recording medium, and the heating resistor corresponds to an image signal. This can be achieved by configuring the device to generate heat.

More specifically, the bias magnetic field applying section is a magnetic head having a winding, and is a long head having a B4 width of 257 square centimeters or more. An alternating current signal is applied to this to form a no-Z bias magnetic field. Furthermore, the heating resistor is integrally molded within the gap of the elongated head, which is the bias magnetic field applying section.

Each issue corresponding to the image information is supplied to the IJ-y line, and a bias magnetic field and heat are simultaneously applied to the recording medium from the same side to the heating resistor until the temperature reaches around the Curie point of the magnetic recording medium according to the image information. .

In this way, the bias magnetic field application section and the heat application section are integrated over a B4 width of 257 square centimeters or more, creating a compact configuration that allows for calmness that corresponds to the image information! It is characterized by forming oneself.

In addition, since the bias magnetic field applying section and the heating resistor can be provided in one of the towers facing the recording medium, the recording head for thermomagnetic convolution of the present invention can be directly connected to the magnetic side of the recording medium or Recording is possible from any side that is in contact with the magnetic material through the base layer.

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1st. As shown in the figure, the magnetic head 1, which is a magnetic field applying section, is a long B4 head with a lateral width of 257 degrees or more, and the shape is similar to a normal magnetic head. The core material is 7
8 (to), R-Malloy is used, and winding 2 is a normal enamelled copper wire wound 500 times and AC power is supplied. As a result, when a magnetic recording medium passes under this head, the medium is uniformly magnetized with alternating current.

Furthermore, for magnetism, a heating resistor 4 is embedded in the gap of the Rad,
It has been made longer and integrated with the magnetic head. By adopting such a configuration, it has become possible to simultaneously apply a magnetic field and heat to the recording medium from the same side.

FIG. 2 shows an enlarged view of the heat application section. The structure and effect are exactly the same as a commonly used thermal head, only the shape is different. 4 is a magnetic head gap of 50 μm
The heating resistor RuO2 is embedded to a thickness of 60 μm over the entire area, and the lift-off method is used for the embedding. 6 is 10 μm thick overcoat glass 7 is A
I? -Pd electrodes, and these are printed in advance on the bias magnetic field application section before making the magnetic head. Reference numeral 5 denotes a lead wire from the electrode. A signal is applied here according to the image information, and a current flows through the heating resistor. The heating element generates heat up to around the Curie point of the magnetic recording medium, and generates heat according to the applied signal. A pattern is provided. By the way, in order to make it longer, the electrodes and lead wires were printed in advance using a method not shown in the example before winding the magnetic head.
It has a high density of 8 to 10 lines per ml.

In this way, an image was produced using the integrated head and the printing apparatus shown in FIG. 3.

In FIG. 6, reference numeral 11 indicates an integrated thermomagnetic convolution recording head according to the present invention. Here, the part of this head facing the recording medium is placed in close contact with the recording medium.As the magnetic recording medium 13, a belt whose base film is coated with CrO2 having a Curie temperature of about 160 C is used. Also, the bias magnetic field generated by the AC power supply 12 is C
A value smaller than the coercive force of rO2 of 500 to 600 oe, that is, 50 oe is applied. A bias magnetic field is always applied to the magnetic recording medium 13, and a signal corresponding to image information is applied to the heating resistor to generate a thermal pattern. The coercive force of 1Cr02 in the area where heat is applied to the medium 16 decreases, and a magnetization pattern is generated due to the thermoremanent effect. Before cooling, a magnetization pattern corresponding to the image information is formed in this way, and this magnetic latent image is developed by the developer 15.
The magnetic toner adheres to the latent image by magnetic force to form a visible image, which is transferred onto plain paper 16 by a transfer device 17.

The image transferred to the plain paper 17 is fixed by a fixing device 18. The magnetic toner remaining on the recording medium 13 is removed by a cleaner 19.
The demagnetizer 20 demagnetizes the recording medium.

Although this apparatus has the recording medium 16 in the form of a belt as shown in FIG. 6, it is of course possible to form it into an F-ram shape by applying 6x02 to the drum. Further, the cleaner 19 may be either a fur brush cleaner or a blade cleaner.

An attempt was made to obtain an image on plain paper using these configurations, and very good results were obtained with an image density of 1.0 or more, a background of 0.02 or less, and a resolution of 8 to 10 dots/square. This result did not change even after printing 10,000 sheets, and the overcoat glass layer B shown in FIG. 2 could be used without any problems in terms of wear resistance, heat resistance of the magnetic head core 1, etc. Therefore, it was confirmed that the spatula P according to the present invention was functioning satisfactorily. Furthermore, in terms of simplifying the device, the magnetic head and the thermal head can be handled as an integrated device without the trouble of incorporating them separately.

FIG. 4 shows another embodiment of the present invention, in which the heat applying section is not placed in the gap of the magnetic spatula F, but is integrated in the vicinity of the gap as much as possible with a gate, making the length longer. The integrated head shown in Fig. 4 has the heat application section shown in Fig. 2 housed in one side of the magnetic head bias magnetic field application section, and only the heat application section may be made in advance, or the magnetic head It may also be formed on the bias magnetic field application section of .

To summarize the features of the thermomagnetic writing head according to the present invention described above, 1) the ζias magnetic field applying means and the heat applying means are integrated;
1. Due to the compact size, the device becomes smaller and the mechanism becomes easier.

2) Since the bias magnetic field only needs to be smaller than the coercive force of CrO2, which is the magnetic recording medium, the applied current for the bias magnetic field can be reduced.

6) Since the bias magnetic field and heat are applied simultaneously from the recording layer side of the magnetic recording medium, there is no attenuation of the bias magnetic field and heat due to the thickness of the base layer, and the density of the image can be higher than that of conventional methods. .

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of a thermomagnetic convolution recording spatula V according to the present invention, FIG. 2 is an enlarged view of the portion of the head in FIG. 1 that comes into contact with a cicada log medium, and FIG. 4 is a magnetic printing apparatus using an embodiment of the present invention, and FIG. 4 is a variation of the present invention. (Symbols in the figure) 1: Bias magnetic field application section, 2: Winding wire, 3: S-air core, 4: Heat-generating resistor, 5: Lee R wire, 6: Overcoat glass layer, 7: Electrode, 8: Non-wire Magnetism (and 2 others) *1m Procedural amendment, December 13, 1980, Patent Application No. 106966-2, Title of invention: Heat-air recording head 3, Person making the amendment' case Relationship with Patent applicant ¥1
Name (549) Fuji Xerox Co., Ltd. Kasumigaseki Building Post Office Post Office Box No. 49 6 Number of inventions increased by amendment 0 Retrospective history 1) In the column ``Title of invention-1'' of the specification, ``For thermomagnetic writing'' Correct "recording head" to "recording head for thermomagnetic writing". 2. Amend the "Scope of Claims" column as shown in the attached sheet. 6) 4th line from the bottom of the first page of the 0 specification, "... recording head" is corrected to ``recording head'' 0 Same page 4th line, 4th to 5th line from the bottom, ``... ...Correct "recording head" to "recording head". 801irJ 9th line corrects 7 to 6th line from the bottom of No. 6, [...recording belly button) 7 as "recording head".
On the second and third lines of the page, "...recording head" is corrected to "recording head". 4) In the 5th line from the bottom of the 9th line of Akira #I, correct ``...6 recording head'' to ``recording head.'' “The above claims provide a magnetic recording head that forms a magnetic latent image on a magnetic recording brass medium, in which a heating resistor is formed in or near a gap in a noisy magnetic field applying head, and the heating resistor is used to signal an image signal. A recording head for thermomagnetic writing that is likely to generate heat in response to.

Claims (1)

[Claims] Magnetic recording head F for forming a magnetic residue image on a magnetic recording medium
90. A recording head for thermomagnetic writing according to 90, wherein a heating resistor is formed in or near the gap of the magnetic field application head, and the heating resistor generates heat in response to an image signal.