JPS6097376A - Thermomagnetic recording device - Google Patents

Abstract

PURPOSE:To simplify the constitution while holding a picture quality by heating a magnetic recording medium under a prescribed magnetic field by minute heating bodies arranged with a high density to form a magnetic latent image. CONSTITUTION:Minute heating resistors 2 are provided which are arranged linearly with a high density orthogonally to the advance direction of a thermomagnetic recording medium 1 whose magnetic characteristics are changed by temperature, and the medium 1 degaussed by a degaussing device 4 is fed out to a heating head array 3. The medium 1 in the peripheral part of resistors 2 is magnetized by a permanent magnet 10, and resistors 2 are heated by a heating command of a control part 12 corresponding to recording information, and the recording medium 1 is heated partially to form a magnetized pattern 20. The pattern 20 has a size corresponding to the size of heads of heating resistors 2 and is developed by a developing device 7 and is printed. Thus, the picture quality is held with a simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a thermomagnetic recording device that has a simplified configuration while maintaining image quality.

[Background technology]

For example, a thermomagnetic recording device includes a first permanent magnet that magnetizes a magnetic recording medium in a predetermined direction, and a thermal magnet that heats the magnetic recording medium magnetized in a predetermined direction to a temperature of one Curie or higher in accordance with an image signal. A system has been proposed that includes a head and a second permanent magnet that simultaneously heats the thermal head and applies a magnetic field to the magnetic recording medium in a direction opposite to and weaker than the magnetic field of the first permanent magnet. According to the thermomagnetic recording device, a magnetic recording medium magnetized in a predetermined direction by a first permanent magnet is heated by a thermal head in accordance with an image signal,
By magnetizing the heated portion in the opposite direction with a second permanent magnet, a magnetic latent image based on thermal residual magnetization is formed on the magnetic recording medium. The image can be reproduced by developing this magnetic latent image with magnetic toner and fixing the toner image after transfer.

However, according to this thermomagnetic recording device, the first and second
Because it requires two permanent magnets.

There are limits to how simple the configuration can be.

[Object and structure of the invention]

The present invention has been made in view of the above, and in order to simplify the configuration while maintaining image quality, a magnetic recording medium is heated in accordance with an image signal with a thermal head of a predetermined size or smaller under a predetermined magnetic field. In other words, according to the thermomagnetic recording device of the present invention, the shape of the thermal head can be set to a size of, for example, 1 20 pm or less. Therefore, the density of magnetic dots is increased, thereby forming a magnetic latent image with excellent image reproducibility using only a single magnetic field means.

〔Example〕

Hereinafter, the thermomagnetic recording device according to the present invention will be explained in detail.

FIG. 1 shows an embodiment of the present invention, in which a thermomagnetic recording medium 1 whose magnetic properties change depending on temperature, and a linear dot with a required dot density perpendicular to the traveling direction of the thermomagnetic recording medium 1 are shown. A heating RAD array 3 (which cooperates with a permanent magnet 10 described later) that partially heats the surface of the recording medium to form a magnetic latent image according to recorded information, and a heating resistor 2 disposed in A demagnetizer 4 using a magnetic head that demagnetizes the thermomagnetic recording medium 1 in front of the helad array 430, rolls 5a and 5b that stretch and rotate the endless thermomagnetic recording medium 1, and the demagnetizer 4 a demagnetizing signal generator 6 that applies a demagnetizing signal; a developing device 7 that applies magnetic toner to the magnetic latent image formed by the door array 3 to obtain a visible image; A transfer device 9 that transfers the image onto plain paper 8, a permanent magnet 10 provided at the bottom of the heated RAD array 3 sandwiching the thermomagnetic recording medium 1, and a thermomagnetic recording medium with a permanent grinding stone 10 fixed therein. A backup roll 11 rotates in contact with the inner surface of the l.

The heating control signal for the heating head array 3 and the roll 5a are controlled based on the instructions from the console, No. 46 from each sensor and switch, and the input information of the recorded information.
! A control unit using a microcomputer that performs control such as signals for starting and stopping the ping motor, commands for controlling the developing device 7 and transfer device 9, and further issuing operation commands to the degaussing signal generator 6. 12 and the control unit 1
2. A drive circuit 13 that drives each white path and each device based on various commands outputted from 2, and a recording medium 1 after transfer is completed.
A cleaner 14 is provided to clean and remove residual toner.

The control 1 unit 12 includes an input interface 7 ace 12b1 that sends input information to a pass line 12m, a ROM l in which programs for controlling each of the above-mentioned control objects are stored.
2 c, a CPU l 2 d that issues necessary control commands based on the program of the ROM I 2 c, a RAM l 2 e that temporarily stores input information and calculation results by the CPU 12 d, and a control command, etc. The drive circuit 1
3 and an output interface 1 that sends out to the demagnetization generation circuit 6.
A thermomagnetic recording medium consisting of a large number of streaks, for example, 100 pm thick polyimide or My 2-film, on which CROT particles are dispersed in polymer willow fat such as polyarylate at a ratio of 30 weight%. It can be made by applying the same with a roll coater. In addition, thermomagnetic recording media
Suitable materials include Mn-B1, Gd-Co,
Tb-Fe etc. can be used. Further, the outer peripheral surface of the backup roll 11 is coated with silicone rubber having a thickness of 5 mm.

In the above configuration, when the star 1 button on the console is swept, the control unit 12 FJ: (!-) is rotated and the degaussing signal generator 6 is activated to roughly control the developing device 7 and transfer device 9. #1 or the fixing device (not shown) is operated.The thermomagnetic recording medium 1 is rotated by driving the roll 5a in a stepwise manner, and the three-dimensional recording surface demagnetized by the demagnetizer 4 is heated and sent to the RAD array 3. The thermomagnetic recording medium net around the heating resistor 2 is uniformly magnetized by the permanent magnet lO, and in this magnetic field, the control unit 12 issues an IP1 command according to the recorded information (image signal). Based on this, the drive circuit 13 causes the heating resistor 2 to generate heat, and by partially heating the thermomagnetic recording medium l, a so-called thermoremanent magnetism phenomenon occurs, and magnetization occurs as shown in FIG. A pattern 20 is formed. At this time, the magnetized pattern 20
are aligned in the direction of the uniform magnetic field generated by the permanent magnet lO, and all of them are oriented in one direction.@This magnetization pattern 20 has a size corresponding to the size of one heating resistor with 20 dots. The magnetic latent images are arranged at a constant interval [&I'l] in the direction of movement (arrow shown in the figure). Therefore, the formed magnetic latent images are
When developed with &i-based toner, the magnetic toner 21 adheres to the edge of each magnetized pattern 20 where the a rise sharply changes as shown in FIG.
Uniform adhesion can be obtained by setting the size and spacing to the same size (in this case, if the spacing is too wide, the toner will adhere in horizontal stripes). After the magnetic toner is transferred to the section 9 and transferred to the plain paper 8, the surface is cleaned by the cleaner 14 and demagnetized again, and the above-mentioned process is repeated.Meanwhile, the transfer process is performed. The plain paper 8 is sent to a fixing device (not shown), where it is fixed, and the printing process is completed.

The inventors applied heating to door array 3 at 16 dots/am.
When magnetic recording was attempted using a dot shaped dot, it was confirmed that toner could be uniformly adhered even to solid black areas. When further heating was performed on a 30-dot door array at 6 dots/m''t', black streaks were observed in the peta black portions, making the image difficult to see.

Figure 3 shows the results of a series of studies, with a linear density of 16do.
The size of the heating resistor (that is, the size of the magnetization pattern) at t/wn is 60 μm, and at 6 do v-, it is about 160 μm. Image density I and D are 5 (to) x 5
(To) is the value measured by the Macbeth IF degree needle.As is clear from Figure 3, it is 16 dots/m (6
0 pg) is 1. D is about 1.4, but 6dots
At 7 wm (160 μm), I and D decrease to about 0.8. Therefore, it can be seen that the present invention functions effectively as long as a heated RAD array having a linear density of 16 dat/mm or more is used. As described above, the linear density and the size of the heat generating resistor are not important points in realizing the present invention.

Although an example has been shown in which the permanent magnet 5 is provided at the bottom of the heating radar array 3, it can also be provided at the top. Also, a DC electromagnet may be used in place of the permanent magnet. Also, although the demagnetizer 7 uses an erasing magnetic head in the example shown, it is also possible to apply heat using a heat roll commonly used in copying machines, etc. (Effects of the Invention) As explained above, according to the thermomagnetic recording device of the present invention,
Since a magnetic latent image is formed by heating the magnetic recording medium in accordance with an image signal under a predetermined magnetic field with a thermal head of a predetermined size or less, the configuration can be simplified while maintaining image quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the formation of a magnetization pattern and adhesion of magnetic toner according to the present invention, and FIG. 3 is an illustration of image density 1, D and heating resistor. Characteristic diagram C showing size relationship Explanation of symbols 1...thermomagnetic recording medium, 2...heating resistor, 3...
・To heating, door array, 4... demagnetizer 1 5' 15
b... Roll, 7... Developing device, lO... Permanent magnet, 11... Ba, Kur, Brol, 12... Control unit, 13... Drive circuit. Patent applicant: Fuji Zero, Kusu Co., Ltd. agent Patent attorney: Shin Matsubara Toki Patent attorney: Seishunma Muraki Patent attorney: Taira 1) Yudo Tadashi Patent attorney: Atsushi Ueshima - Patent attorney: Hitoshi Suzuki

Claims (2)

[Claims] (1) In a thermomagnetic recording device that develops, transfers, and fixes a magnetic latent image formed on a magnetic recording medium whose magnetic properties change depending on temperature, it becomes an image. and a heating means having a heating element smaller than a predetermined size and heating the magnetic recording medium under the predetermined magnetic field in accordance with an image signal to form a magnetic latent image. A thermomagnetic recording device. (2) The thermomagnetic recording device according to claim 1, wherein the heating element has a size of 120 μm or less.