JPS60242565A - Magnetic recording device - Google Patents

Abstract

PURPOSE:To shorten an access time similarly to a disk medium and to facilitate the reproduction of a still picture by rotating a drum and moving a recording part or detection part axially on the surface of the drum. CONSTITUTION:The drum 1 which has a recording medium on the surface is rotated through a rotating shaft 2. The drum 1 is sandwiched between magnetic poles of a recording stylus 5 which has an auxiliary magnetic pole 3 and a main magnetic pole 4 fixed inside and outside respectively at a specific interval. Then, the stylus 5 moves on the periphery of the drum 1 relatively in parallel to the axial direction of the drum 1 as the drum 1 is rotated. A signal is supplied to the exciting coil of the main magnetic pole 3, which is magnetized to perform recording in a vertical magnetized film at the same position.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a magnetic recording device for recording audio and video using magnetism, and more particularly to a magnetic recording device using a drum-shaped recording medium.

[Technical Background of the Invention and Problems Therein] Conventionally, there are magnetic recording devices that use disks or tapes as recording media, and are used for audio, video, etc.

In such magnetic recording devices, improvements in sound quality, image quality, and retention performance are of course sought after, but in recent years, with the increase in the amount of information, there has been a trend toward smaller size and larger capacity recording. is strongly demanded by society.

Therefore, currently, with the aim of increasing the density of magnetic recording devices,
Various research and development efforts are underway, but the ones that are attracting particular attention at this stage are technologies that use vertical magnetization instead of conventional horizontal magnetization, and technology that uses laser heat to generate a single Curie point or compensation temperature. There are two types of magneto-optical recording devices used. The former is scheduled to be put to practical use in tapes, floppy disks, etc. in the near future, and is suitable for flexible media. The latter will be put to practical use primarily in magnetic disks and the like, and will be used for audio, video, computer data files, and the like.

Incidentally, while tape generally has the advantage of having a simple device structure, a large capacity (6), and a low unit price per bit, its structure of winding a long tape reduces the access time during use. However, when used for videos, special playback such as still images or slow playback is not good. On the other hand, disks can be accessed by simply moving the recording section (and detection section) in parallel, so not only is the access time much shorter than with tape, but still images can be easily played back if the detection section is fixed. Therefore, it is particularly suitable for digital recording such as static image recording and Bunkichi files.

However, discs, with the exception of optical discs, are difficult to read, and are therefore unsuitable for flexible media.Compared to tapes, mechanisms such as tracking and servo are more complex, and they are less susceptible to vibration and shock. Furthermore, when constant-speed recording is performed, such as on records for OTI A, there are drawbacks such as an invalid area occurring inside the disc due to the difference between the inner and outer circumferences.

In this way, conventional tapes and disks have advantages and disadvantages,
It is becoming impossible to respond to the increasingly diverse needs. For example, in an in-vehicle system, starting with the map file in the navigation system,
A digital recording file system that is directly connected to displays that will be introduced inside cars will be required in the future, but it is essential to miniaturize it from the standpoint of space inside the car and ease of use. From this point of view, it has been desired to develop a new type of magnetic recording device that has the advantages of conventional tapes and disks.

[Object of the Invention] The present invention was proposed in order to solve the problems of the prior art as described above.The purpose is to eliminate invalid areas, improve the overall recording density, and achieve the same level as a disk medium. It is an object of the present invention to provide a magnetic recording device which enables short access times and playback of still images, and whose mechanism can be simplified to the extent that reliability against vibrations can be ensured.

[Summary of the Invention 1 The magnetic recording device according to the present invention has a configuration in which a drum-shaped recording medium is rotated and a recording section (and detection section) is moved along the inner circumference or outer circumference of the drum in the direction of the drum axis. As with disk media, it can be accessed by simply placing the recording section (and detection section) in parallel, and access time is shorter than with tape.Furthermore, still images can be easily played back by fixing the detection section; On the other hand, since there is no circumferential difference depending on the position of the recording section (and detection section), there is no invalid area, and furthermore, it is possible to simplify the non-conventionality compared to a disk medium.

[Embodiments of the Invention] Although the present invention as explained above can in principle also be applied to magneto-optical recording devices, here, the present invention is particularly applied to a system using perpendicular magnetism. An example will be explained.

In FIG. 1, a drum 1 with a recording medium on its surface is
It is connected to a rotating shaft 2, and rotates via this shaft 2 during use. This drum 1 has an auxiliary magnetic pole 3 fixed to its inner side and a main magnetic pole 4 fixed to its outer side at a constant interval, and is sandwiched between the magnetic poles of a recording stylus 5. Then, as the drum 1 rotates, the recording stylus 5
is configured to move around the drum 1 relatively parallel to the axial direction of the drum 1.

Figure 2 shows the drum 1 and the recording section in detail.As shown in the figure, the drum 1 has a three-layer structure, and from the inside, there is a drum base 6 for supporting purposes, and a drum base 6 for converging magnetization. A horizontally magnetized film 7 and a perpendicularly magnetized FItA 8 serving as a recording medium are laminated. On the other hand, an excitation coil 9 is wound around the main magnetic pole 3 of the recording stylus 5, and by sending a signal to this excitation coil 9, the magnetic flux is changed, thereby magnetizing the main magnetic pole 3, thereby Recording is performed on the perpendicularly magnetized film 8.

The operation of the present invention having the above configuration is as follows.

In other words, the recording medium is formed on a drum, which is rotated, and the recording section is moved in the axial direction on this surface (because the information recorded on the drum can be accessed, the access time can be reduced compared to tape .During recording, unlike a disk, there is no difference in circumference, so even if constant speed recording is performed, no invalid areas will be generated (thus, the recording density will be improved.The above is the same as in the recording section. The same applies when a detection unit that moves in the axial direction is installed and playback is performed.In particular, during playback, the detection unit can be stopped in the same way as a disc, so that still images can be played back. Since the structure is such that the recording unit is simply rotated and the recording section is moved in parallel, mechanisms such as tracking are simplified compared to disk media, and reliability against vibrations can therefore be ensured.

In addition, in the present invention, the accuracy of the drum and the rotating shaft of the rotating system and the machining accuracy of the drum surface need to be sufficiently high, and the recording medium on the drum is formed by sputtering while rotating the drum. This is done by law etc. Further, Ni--Fe or the like is used as the horizontally magnetized film, and Qo''Cr or the like is used as the vertically magnetized film.

FIG. 3 shows a second embodiment of the magnetic recording device according to the present invention. In this embodiment, in particular, the auxiliary magnetic pole 13 is a long rectangular object that covers the recording portion, and is separated from the main magnetic pole 14 and fixed inside the drum 1. It is configured to move in the axial direction. The other configurations are the same as in the first embodiment.

By configuring this example, there is no need to connect the two magnetic poles as shown in the first example, and the movement space occupied by the mechanism can be reduced, and the configuration itself can be further simplified. be.

Further, as described above, the present invention can be similarly applied to a magneto-optical recording type device, and the same effects can be obtained.

[Effects of the Invention] As explained above, according to the present invention, by forming the recording medium in the shape of a drum, it is possible to achieve a short access time comparable to that of a disk medium and playback of still images, while eliminating invalid areas. It is possible to provide a magnetic recording apparatus which can improve the overall recording density, simplify the mechanism, and ensure sufficient reliability against vibrations.

[Brief explanation of drawings]

1 and 2 are views showing a first embodiment of a magnetic recording device according to the present invention, respectively, in which FIG. 1 is a schematic sectional view, FIG. 2 is a partially enlarged sectional view, and FIG. FIG. 2 is a schematic cross-sectional view showing a second embodiment of the magnetic recording device according to the invention. 1... Drum, 2... Rotating shaft, 3.13... Auxiliary magnetic pole, 4.14... Main magnetic pole, 5... Recording stylus, 6... Drum base, 7... Horizontal Magnetized film, 8...
- Perpendicular magnetization film, 9... excitation coil. Applicant Clary A Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 14 Note 1111

Claims (1)

[Scope of Claims] (1) A recording medium formed in the shape of a drum, a rotating means for the recording medium, and a recording section or a detecting section for recording or reproducing, the drum is rotated and recording is performed on the surface of the drum. A magnetic recording device characterized in that recording or reproduction is performed by moving a section or a detection section in an axial direction. (2) The recording medium is a vertically magnetized film overlaid on a horizontally magnetized film, and the recording section is composed of an outer main magnetic pole and an inner auxiliary magnetic pole around which an excitation coil is wound. Claim 1: The device rotates the recording medium between the magnets, and records on the perpendicularly magnetized film by changing the magnetic flux by a signal sent to the excitation coil and magnetizing the main magnetic pole. The magnetic recording device described. 3) The magnetic recording device according to claim 2, wherein the auxiliary magnetic pole moves integrally with the main magnetic pole. (4) The auxiliary magnetic pole is long enough to cover the recording portion, and is fixed inside the recording medium, with only the main magnetic pole moving. The magnetic recording device described in Section 1. (5) The magnetic recording device according to claim 1, wherein the recording medium and the recording section are of magneto-optical recording type.