JPH03124463A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To improve the recording quality by a method wherein the surface of a movable body is dipped in a magnetic fluid, and the magnetic fluid is vibrated to be prevented from adhering on a part of the surface of the movable body on which a magnetic latent image is not formed. CONSTITUTION:A predetermined magnetic patterns are successively written on a magnetic substance layer 11 by a writing head 14, and a magnetic latent image is formed thereon. When a magnetic latent image part is dipped in a magnetic fluid 21 by the rotation of a movable body 13, the magnetic fluid magnetically adheres on the surface of the movable body 13 on which the magnetic latent image is formed, whereby the latent image is developed. Because a magnetic force does not act between a part on which the magnetic latent image is not formed and the magnetic fluid 21, the magnetic fluid does not adhere thereto. The developed pattern of the magnetic fluid adhering to the surface of the movable body 13 is transferred to a recording medium 17 by a transfer roller 18. After the completion of transfer, the magnetic latent image is erased by a demagnetizing head 15. After the completion of demagnetization, a cleaning blade 16 removes the magnetic fluid and the like adhered to the surface of the movable body 13 to clean the surface of the movable body 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording device that uses a magnetic fluid as a developer.

[Prior Art] A magnetic recording method is a method of visualizing a magnetic latent image formed on a magnetic layer using a magnetic material such as magnetic toner.

Since magnetic latent images have high resolution, magnetic recording methods are promising as a method for forming fine patterns.

However, when a magnetic toner is used as the magnetic material, a fine pattern commensurate with the magnetic latent image cannot be formed because the particle size of the magnetic toner is 10 micrometers or more.

To solve the above problem, magnetic recording devices using magnetic fluid as the magnetic material have been proposed (for example, Japanese Patent Laid-Open No. 60-480
Publication No. 63). The outline of the magnetic recording device disclosed in Japanese Patent Application Laid-Open No. 60-48063 is as follows.

First, a magnetic latent image is written on a magnetic layer on the surface of the movable body, and the surface of the movable body is immersed in a magnetic fluid for development. The magnetic fluid attached to the surface of the movable body through development is transferred to the recording medium. After the transfer, the magnetic latent image is demagnetized and the surface of the movable body is cleaned by a cleaning blade.

[Problems to be Solved] In the conventional magnetic recording device described above, during development, the magnetic fluid may adhere to areas where no magnetic latent image is formed, resulting in deterioration of recording quality. This is mainly due to dirt on the surface of the movable body.

An object of the present invention is to improve recording quality by suppressing adhesion of magnetic fluid to areas where no magnetic latent image is formed during development.

[Means for Solving the Problems] The magnetic recording device of the present invention immerses the surface of a movable body in a magnetic fluid, vibrates the magnetic fluid, and spreads the magnetic fluid to a portion of the surface of the movable body where a magnetic latent image is not formed. This suppresses the adhesion of

[Example] Hereinafter, the present invention will be described in detail based on the accompanying drawings.

First, each component shown in the accompanying drawings will be explained.

Reference numeral 11 denotes a magnetic layer in which powders of Fe2O3, Cr02, etc., Fe (iron), Ni (nickel), and Co (1:1 balt) are dispersed in a resin.

Although not shown in the figure, a protective layer may be provided on the surface of this magnetic layer 11.

Reference numeral 12 denotes a columnar or cylindrical base body, on the surface of which a magnetic layer 11 is formed, which rotates in the direction of the arrow.

The magnetic layer 11 and the base 12 constitute a movable body 13.

A writing head 14 serves as a magnetic latent image forming means, and writes a magnetic pattern on the magnetic layer 11 to form a magnetic latent image.

A demagnetizing head 15 erases the magnetic latent image.

A cleaning blade 16 removes magnetic fluid (described later) etc. attached to the surface of the movable body 13.
3. Cleans the surface.

17 is a recording medium, and transfer paper or the like is usually used.

Reference numeral 18 denotes a transfer roller, which transfers a developed pattern of magnetic fluid formed corresponding to the magnetic latent image of the magnetic layer 11 onto the recording medium 17.

21 is a magnetic fluid, which is made by suspending ferromagnetic powder of about 10 nanometers in water or an organic solvent. This magnetic fluid 21 is attached by magnetic force to the upper part of the magnetic latent image of the magnetic layer 11 to visualize the magnetic latent image.

22 is a storage means, which is a container that stores the magnetic fluid 21.

23 is an ultrasonic vibrator, which applies ultrasonic vibration to the magnetic fluid 21 housed in the housing means 22. This ultrasonic vibrator 23 is attached to the outer wall of the storage means 22.

24 is a driving means that generates an ultrasonic signal and supplies it to the ultrasonic vibrator 23.

The ultrasonic vibrator 23 and the driving means 24 constitute a vibration applying means.

Next, the operation of this embodiment will be explained.

A predetermined magnetic pattern is sequentially written into the magnetic layer 11 by a write head 14 to form a magnetic latent image. When the movable body 13 rotates and the magnetic latent image portion is immersed in the magnetic fluid 21, the magnetic fluid adheres to the surface of the movable body 13 on which the magnetic latent image is formed due to magnetic force, and development is performed. In the portion where the magnetic latent image is not formed, no magnetic force acts between the magnetic fluid 21 and the magnetic fluid 21, so that the magnetic fluid does not adhere. The developed pattern of the magnetic fluid attached to the surface of the movable body 13 is transferred onto the recording medium 17 by the transfer roller 18 . When the transfer is completed, the magnetic latent image is erased by the degaussing head 15. When the degaussing operation is completed, the cleaning blade 16 removes the magnetic fluid and the like adhering to the surface of the movable body 13, thereby cleaning the surface of the movable body 13.

While the above series of cycles is being performed, the ultrasonic vibrator 23 continuously generates ultrasonic vibrations. This ultrasonic vibration is transmitted to the magnetic fluid 21, suppresses adhesion of the magnetic fluid to the portion of the surface of the movable body where the magnetic latent image is not formed, and removes dirt adhering to the surface of the movable body 13.

The removed dirt is dispersed into the magnetic fluid 21 by ultrasonic vibration. Therefore, dirt does not collect on the surface of the magnetic fluid 21 and re-adhere to the surface of the movable body 13.

[Effect] In the present invention, by applying vibration to the magnetic fluid, adhesion of the magnetic fluid to the portion of the surface of the movable body where the magnetic latent image is not formed is suppressed, thereby improving the recording quality. Can be done.

[Brief explanation of the drawing]

The figure is an explanatory diagram showing an embodiment of the present invention. 11...Magnetic layer 13...Movable body 14...Writing head (magnetic image forming means) 2
1... Magnetic fluid 22... Storage means 23... Ultrasonic vibrator 24... Drive means or more

Claims (1)

[Scope of Claims] A movable body on which a magnetic layer is formed, a magnetic latent image forming means for forming a magnetic latent image on the magnetic layer, and a storage for storing a magnetic fluid for visualizing the magnetic latent image. A magnetic recording device comprising: a means for applying vibration to a magnetic fluid stored in the storing means;