JPS59158284A - Recording method using magnetic fluid - Google Patents

Abstract

PURPOSE:To transfer an image clearly onto the surface of a recording paper by magnetic fluid on the surface of a non-magnetic printing roller by driving a magnetic head according to an image signal from the back of the recording paper arranged at a specified clearance with the magnetic fluid attached by a fixed amount onto the surface of the non-magnetic printing roller as the roller is turned partially being immersed thereinto. CONSTITUTION:A recording paper 5 is arranged at a specified clearance with a magnetic fluid layer 22 held and form on the surface of a printing roller 3. One or more magnetic heads 6 arranged on the back of the recording paper 5. At this time, the magnetic head 6 is driven by an output from an analog modulation circuit 8 for modulating an image signal 7 to form a magnetic field toward the magnetic fluid from the back of the recording paper 5 according to the image signal so that the magnetic fluid is made to jump onto the recording paper 5 to record the image.

Description

[Detailed Description of the Invention] Technical Field: The present invention relates to an arrangement method using a magnetic fluid as an image display material, and in particular, to a method for uniformly holding the magnetic fluid on the surface of a substrate and transferring a portion of the magnetic fluid to a recording paper using magnetic force based on an image signal. Concerning the method of transcription.

Prior Art: A magnetic fluid is a colloidal melt made by suspending ferromagnetic powder of about 100 A in water or an organic solvent. This magnetic fluid has both the ferromagnetism characteristic of solids and the boiling property characteristic of liquids, and has the characteristic that the liquid level rises in a magnetic field to form needle-like protrusions in the direction of magnetic field lines. Recording devices that utilize this property of magnetic fluid for ink have already been developed. For example,
A magnetic ink recording device is disclosed in Japanese Patent Application Laid-open No. 16268'9/1983.

As shown in FIG. 1, magnetic ink 101 held at the tip of a magnetic stylus 100 is applied to a signal source 103 by applying a voltage between the stylus 100 and the counter electrode 102.
The image is expanded and transferred to the recording paper 104 in response to a signal from the recording paper 104. According to this device, in order to obtain high-quality recorded images, it is essential to delicately set the shape of the tip of the stylus 100 and adjust the gap between the stylus tip and the counter electrode 102 with great precision. Because it is an internal work.

Not practical. In addition, in the inkjet method in which magnetic ink is ejected from a nozzle, the nozzle has minute holes, so the nozzle is easily clogged by dirt in the ink, dirt adhering from the outside, or by drying of the ink. . To prevent clogging, there are measures such as installing a tweeter, using an ink cartridge to prevent dust from getting in, or constantly allowing ink to flow out of the nozzle and prohibiting the reuse of ink. Since it cannot be 1, it ends up being expensive.

Purpose of the invention: The purpose of the present invention is to provide a recording method capable of obtaining high-quality recorded images using magnetic fluid as an image display material. An object of the present invention is to provide a recording method using a recording device.

Summary of invention: The recording method of the present invention is as follows.

+11 A step of immersing at least a portion of the rotating non-magnetic substrate in a magnetic fluid.

12) rotating the substrate to deposit and hold a certain amount of magnetic fluid on the surface of the substrate;

(31 Step of driving a magnetic head based on an image signal on the back side of the recording paper which is arranged with a predetermined gap from the magnetic fluid held on the surface of the substrate; and (41 Step of driving the magnetic head on the surface of the substrate by the driving of the magnetic head. transferring a portion of the fluid to the disposed paper surface;

The above objective is achieved.

Examples: The present invention will be described in detail below based on examples and with reference to the drawings.

According to the method of the present invention, first, as shown in FIG. 2, at least a portion of a rotatable non-magnetic substrate 3 made of an aluminum roller or the like is immersed in a magnetic fluid 2 contained in a container 1. The magnetic fluid 2 is obtained by coating the surface of, for example, about 100^ of ferrite powder with a surfactant made of oleic acid ions, and dispersing this in kerosene. Base body 3
The magnetic fluid 2 is rotated by a driving means (not shown), and a certain amount of the magnetic fluid 2 is attached to the surface of the base 30 using its viscosity.

Excess magnetic fluid 2 that adheres to the base surface.

It is appropriately scraped off by a blade 4 placed near the surface of the substrate. As a result, the magnetic fluid 22 held on the surface of the base 30 forms a uniform layer.

A recording paper 5 is held and formed on the surface of the base 3 and is placed with a predetermined gap from the FC magnetic fluid layer 22. Recording paper 5
One or more magnetic heads 6 are arranged on the back side of the magnetic head 6 . The magnetic head 6 need not be of any special type; for example, a head commonly used in tape recorders or the like may be used. In particular, it is preferable to use a magnetic field that forms a magnetic field perpendicular to the surface of a magnetic fluid, and a head for perpendicular magnetic recording is suitable. This magnetic head 6 is ll1
It is driven by the output from the analog modulation circuit 8 that modulates the iI image signal 7, and forms a magnetic field directed toward the magnetic fluid from the back side of the recording paper 5 in accordance with one image value number, and as described above, the magnetic field is directed toward the magnetic fluid from the back side of the recording paper 5. Promote the protrusion.

An image is recorded by jumping the magnetic fluid onto the recording paper 5.

Since the recording paper 5 moves in the direction of the arrow relative to the magnetic pad 6, recorded images are formed one after another thereon.

The magnetic fluid 22 on the surface of the base 3 is as shown in FIGS.
As shown in (a), a part of the tip becomes a protrusion due to the magnetic force generated by the driving of the magnetic head 6 ((a)
= (b) ) o The magnetic fluid flow 230 is drawn out from the magnetic fluid protruding portion 23 when the holding force of the magnetic fluid on its own M and the surface of the base body and the magnetic attraction force of the magnetic head 6 are balanced (( b)→fc)).

The magnetic fluid 22 begins to jump to the recording paper 5 ( (
d) ). When the magnetic head 6 loses its magnetic force, the magnetic fluid 22 does not jump (and is developed sequentially as it is depending on the shape of the protrusions and the original state. As a result, the desired image information is obtained.

Effect of the invention: According to the recording method of the present invention, a magnetic fluid injection nozzle,
Since neither the stylus for magnetic flow retention nor the counter electrode of the stylus is used, it is necessary to prevent the nozzle from crinkling, to create a foot with a delicate shape at the tip of the stylus, and to finely adjust the gap between the stylus and the counter electrode. Any work that is extremely difficult in practice will not be undertaken. The magnetic fluid can be clearly transferred to recording paper in accordance with desired image information by an extremely simple operation.

[Brief explanation of the drawing]

FIG. 1 is a conventional recording device, FIG. 2 is a schematic diagram of a recording device for explaining an example of the recording method of the present invention, and FIG.
) to (e) are explanatory diagrams illustrating the jump state of the magnetic fluid. DESCRIPTION OF SYMBOLS 1- Container, 2... Magnetic fluid, 3... Non-magnetic substrate, 4... Blade, 5... Recording paper, 6... Magnetic head, 7... Image signal, 8...・Analog modulation circuit,
22...Magnetic fluid on the surface of the base body, 23...Magnetic fluid protrusion portion. Applicant: Mita Kogyo Co., Ltd. Agent Shusaku Yamamoto, Physician

Claims (1)

[Claims] 1. immersing at least a portion of the rotatable non-magnetic substrate in a magnetic fluid. (21) A step of rotating the base to hold a certain amount of magnetic fluid in a layer on the surface of the base. Recording using a magnetic fluid including: (4) a step of driving a magnetic head based on an image signal; and (4) a step of transferring a part of the magnetic fluid on the surface of the substrate to the surface of the disposed paper by driving the magnetic head. 2. The recording method according to claim 1, wherein excess magnetic fluid adhering to the surface of the substrate is scraped off with a blade, thereby forming a uniform layer of magnetic fluid on the surface of the substrate.