JPH01312730A - Magnetic recording medium - Google Patents

Abstract

PURPOSE:To allow overwriting on prerecorded information and to eliminate the need for a superposition circuit by printing and forming patterns having periodic structures by magnetic ink on a base material. CONSTITUTION:The printed patterns 2' printed and formed of the magnetic ink on the base material 1 have the periodic structures along the relative sliding direction of the material 1 and a magnetic head 3. The output of an analog amplifier 4 is directly impressed to the magnetic head 3 and the arbitrary analog signal is superposed and recorded on the patterns 2' at the time of signal recording. The recording wavelength is assumed to be sufficiently longer than the periods of the patterns 2 as shown by a waveform 5. The patterns 2 themselves are printed in the state of subjecting the same to prescribed frequency modulation. The signals are superposed on the carrier FM signal if said signals are recorded on the patterns 2 which are the prerecorded information. The need for a high-frequency circuit is eliminated in this way and the overwriting on the prerecorded information is allowed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic recording medium such as a magnetic tape, a magnetic card, or a magnetic disk. The present invention relates to a magnetic recording medium on which record information can be overwritten without erasing it.

[Conventional technology]

In conventional magnetic recording methods, particularly in the magnetic recording of analog signals for audio, the well-known AC bias method is used to cover a wide frequency band and obtain sufficient output even in the long wavelength region. ing.

[Invention tries to solve! Problem 1] By the way, in the magnetic recording system using the AC bias method described above, in order to record by superimposing high frequencies, a high frequency generation circuit is required in addition to the recording signal system. Furthermore, it has been impossible for the user to overwrite signals on the recording medium while preserving the pre-recorded information on the recording medium.

The present invention has been made in view of the above points, and solves the problem of the user being unable to overwrite the BR-record information, thereby enabling multiple recording and eliminating the need for a high-frequency generation circuit and its superimposition circuit. The purpose is to provide a magnetic recording medium.

[Means to solve the problem]

The above object of the present invention is achieved by a magnetic recording medium in which a pattern having a periodic structure is printed and formed on a base material using magnetic ink, and information is magnetically recorded on the printed pattern.

[Effect]

As described above, the present invention provides 11 printed patterns having a fine periodic structure printed and formed by a magnetic layer, for example, printed patterns given a predetermined periodic modulation (frequency modulation), which are prepared in advance. Since the information is recorded on this print pattern as pre-recorded information, it is possible to apparently overwrite the pre-recorded information.

Furthermore, since the printed pattern (pre-recorded information) is used as a high-frequency 1-wave component, so to speak, as a carrier, a high frequency generation circuit and its superimposition circuit are not required as in the AC bias method.

〔Example〕

Below, the present invention will be explained with reference to FIG. 1.2.

FIG. 1 is an explanatory diagram showing the concept of the present invention.

In FIG. 1, l represents a base material, and although a long tape-like material is shown in the illustration, the present invention is not limited to this, and may be applied to various forms such as card-like, disk-like, etc. Applicable. 2' is a printed pattern consisting of a group of fine magnetic stripes printed and formed on the base material 1) using magnetic ink, and has a periodic structure along the relative sliding direction between the base material 1 and the magnetic head 3. In addition, it is considered to be pre-recorded information having a frequency (that is, a narrow pitch) that is sufficiently higher than the frequency of information to be recorded by a user or the like.

When recording a signal, the output of the analog amplifier 4 is directly applied to the magnetic head 3 to record the printed pattern 2'.
An arbitrary analog signal is superimposed and recorded on top. At this time, the recording wavelength is set to be sufficiently longer than the period of the print pattern 2, as shown in waveform 5. By doing this,
Analog information can be easily recorded at long wavelengths without requiring the high frequency additional circuit used in the AC bias method.

FIG. 2 is an explanatory diagram of a magnetic recording medium according to one embodiment of the present invention.

As is clear from FIG. 2, the printed pattern 2 formed by magnetic ink on the base material l is
The image itself is printed with a predetermined frequency modulation. Therefore, when a signal is recorded on the print pattern 2, which is pre-recorded information, this signal is superimposed on the carrier FM signal, and superimposition recording can be achieved very easily.

〔Effect of the invention〕

As described above, by providing a fine pattern using magnetic ink, the present invention eliminates the need for the high-frequency circuit required in the conventional AC bias method, and also eliminates the need for overwriting pre-recorded information (superimposed recording). ), and its value is great.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a magnetic recording medium showing the concept of the present invention, and FIG. 2 is an explanatory diagram of a magnetic recording medium according to an embodiment of the present invention. 1...Base material, 2,2 electric...
...Print pattern, 3...Magnetic head,
11......Analog amplifier. Figure 1 Figure 2

Claims (2)

[Claims] (1) A magnetic recording medium characterized in that a pattern having a periodic structure is printed and formed on a base material using magnetic ink, and information is magnetically recorded on the printed pattern. (2) A magnetic recording medium according to claim (1), wherein the printed pattern is printed with a predetermined periodic modulation.