JPS6120214A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent easy duplication of a magnetic tape with a commercially available recording and reproducing device such as tape recorder by obliquely arranging the gap direction of a head which records and reproduces signals on and from a magnetic recording medium in the running direction of the recording medium. CONSTITUTION:When a tape, on which recording is made by using a recording and reproducing head 5 whose gap is inclined by an angle theta, is reproduced with an ordinary reproducing device, the frequency component at the high band of signals is damped and the data recorded on the magnetic tape cannot be fetched properly, since the direction of the head gap does not coincide. Moreover, when the tape is duplicated with an ordinary sound recording and reproducing device, the data recorded on the tape cannot be reproduced properly, since the data are recorded with the high band of the original signals being largely dampled. When a magnetic tape thus duplicated is reproduced by means of the device shown in the figure, the high band is further damped and the data cannot by reproduced properly, since the head gap direction is further deviated. A magnetic tape is used to explain this preventive measure, but the measure can also be applied to a magnetic disk.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing device used in an external storage device such as a personal computer.

Conventional configurations and their problems In recent years, with the spread of personal computers, magnetic recording and reproducing devices using audio cassettes and the like have become popular as external storage four-wall devices, but cassettes and magnetic tapes, etc. Currently, magnetic tapes are standardized to ensure compatibility, and the shape of the gap of the head for recording and reproducing signals on magnetic tape is also standardized.

Figure 1 shows the relationship between the direction of the head gap and the running direction of the magnetic tape in a conventional magnetic recording/reproducing device. is the head gap.

In general, the angle alignment (azimuth) between the direction of the head gap (3) during recording and the gap of the reproducing head is important in terms of preventing high-frequency loss. Furthermore, the running direction of the magnetic tape (1) and the direction of the head gap (3) of the head (2) are perpendicular to each other.

In other words, as long as commercially available standard products are used, they are compatible in all important respects, including the relationship between the magnetic tape (1) and the head gap (3) shown in Figure 1. For,
Information recorded on magnetic tape, which is a recording medium, can be copied extremely easily using the same equipment used to copy normal magnetic tape that records audio, etc., which poses a major problem from the standpoint of copyright protection for programs, etc. There is.

OBJECTS OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a magnetic recording and reproducing device that cannot be easily duplicated with commercially available recording and reproducing devices such as tape recorders. It has a purpose.

Structure of the Invention In order to achieve the above object, the present invention has a configuration in which the gap direction of a head for recording and reproducing signals on a magnetic recording medium is arranged obliquely with respect to the running direction of the magnetic recording medium. This method takes advantage of the large attenuation of the program to make it impossible for general recording and reproducing devices to copy the magnetic tape on which the program is recorded.

EMBODIMENT AND DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic recording and reproducing apparatus according to the present invention will be described below with reference to the drawings. FIG. 2 shows the relationship between the direction of the head gap of the magnetic recording and reproducing apparatus according to the present invention and the running direction of the magnetic tape. In the indented figure, (4) is a magnetic tape, (5) is a recording/reproducing head, and (6) is a head (5).
), and the direction of the gap (6) is the magnetic tape (
It is inclined by an angle θ from a direction perpendicular to the traveling direction (5) of 4). That is, recording and reproduction of the magnetic tape (4) is performed by the recording and reproduction head (5) in which the direction of the gap (6) is inclined at an angle θ from a direction perpendicular to the running direction of the magnetic tape (4).

A recording/reproducing head (5) with a gap (6) tilted at an angle θ
) is recorded with a head (2) as shown in Figure 1.
), the head gap directions do not match, so the high frequency components of the signal are attenuated, making it impossible to correctly retrieve the data recorded on the magnetic tape. Furthermore, even if the data is copied using a normal recording/playback device, the high frequencies of the original signal will be greatly attenuated and the data will not be reproduced correctly. Furthermore, when a magnetic tape that has been copied in this way is played back using a device such as the one shown in Figure 2, the direction of the head gap will further deviate, the high frequency range will be further attenuated, and the data will not be reproduced correctly. becomes impossible to reproduce.

1. In the illustrations and examples, the magnetic recording medium is a magnetic tape, but the present invention can also be applied to a magnetic disk.

As described in detail, the magnetic recording/reproducing apparatus according to the present invention can extremely easily protect programs and the like from unauthorized copying.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the relationship between the direction of the head gap of a conventional magnetic recording and reproducing device and the running direction of a magnetic tape as a recording medium, and FIG. 2 is a diagram showing the relationship between the direction of the head gap of a magnetic recording and reproducing device according to the present invention FIG. 3 is a diagram showing the relationship with the running direction of a magnetic tape, which is a recording medium. (4)... Magnetic 8c! Conspiracy (magnetic tape), (
5) Recording/playback head, (6) Head gap agent Yoshihiro Morimoto Figure 1

Claims (1)

[Claims] 1. A magnetic recording and reproducing device in which the gap direction of a head for recording and reproducing signals on a magnetic recording medium is arranged obliquely to the running direction of the magnetic recording medium.