JPH06105541B2 - Recording / playback method - Google Patents

Description

The present invention relates to a system for recording various electric signals and reproducing them.

[Conventional technology]

As a method for recording and reproducing an electric signal, conventionally, a magnetic recording / reproducing method and an optical recording / reproducing method, or a heating magnetic recording / reproducing method disclosed in Japanese Patent Publication No. 54-95250 are generally used. There is.

[Problems to be solved by the invention]

However, in the magnetic recording / reproducing system, when a magnetic disk is used, the recording density on the recording track can be made high, but
The pitch of the recording track is about 200 μm, which causes a problem that it is difficult to increase the density of the recording track.

Further, in the optical recording / reproducing system, the pitch of the recording track can be as high as about 2 μm, but the recording density on the recording track is about 2.5 μm because of the mechanical deformation, and the high recording There arises a problem that the density cannot be obtained.

On the other hand, in the heating magnetic recording / reproducing system, recording is performed by applying a magnetic field after the temperature of the recording portion is raised by irradiation of a laser beam, and the distance between the beam irradiation lens and the recording portion is large, and , Since the magnetic field is applied from the vicinity of the tip of this lens, compared to the magnetic recording and reproducing system,
This causes a problem that the recording density on the recording track is lowered.

Therefore, in each of the conventional systems, it is not possible to simultaneously obtain a high recording track density and a high recording density, and it is strongly desired to develop a system capable of improving both densities and performing large-capacity recording / reproduction. Has been reached.

[Means for solving problems]

In order to solve the above problems, the present invention is configured by the following means.

That is, the guide means for the recording track formed on the recording medium together with the magnetic thin film is scanned by the light beam passing through the optical head, and the focus of the light beam coincides with the guide means and follows the guide means. Is supported by an optical head through a swingable support for controlling the magnetic head and a facing gap with the magnetic thin film, and the magnetic head is used to set a reference for the facing gap by focusing control of the optical head. Magnetic recording is performed on the thin film, and this recording is reproduced by either magnetic means or magneto-optical means.

[Action]

Therefore, the guide means is scanned by the light beam passing through the optical head, and the control of the optical head in response to this causes the focus of the light beam to coincide with the magnetic thin film and follow the guide means, and Since the magnetic head is supported by the head, magnetic recording is performed on the magnetic thin film along the guide means, and it is possible to reproduce the magnetic recording by magnetic means or magneto-optical means.

〔Example〕

Hereinafter, the details of the present invention will be described with reference to the drawings illustrating examples.

FIG. 1 is a fragmentary side view showing the structure of a flexible or non-flexible disc-shaped substrate 1, recording track guide means 2 formed on the upper surface thereof, and further to the upper surface thereof. The magnetic thin film 3 thus formed constitutes a recording medium 4,
These are rotated in the direction of the arrow by a motor (not shown).

A light source 6 such as a laser oscillator is provided, and a light beam 7 such as a laser light beam projected from the light source 6 is reflected by a mirror 8
The optical path is bent by the above, and is projected onto the magnetic thin film 3 through the lens 11 which constitutes the optical head 10 together with the holding cylinder 9. The light beam 7 reaches the guide means 2 and is reflected. The light is focused by the lens 11 and is incident on the light receiving element (not shown) via the mirror 8 and the servo mechanism (not shown) is operated according to this situation, and the optical head is driven via the drive member 12 and the coupling member 13. To control 10 in the direction along the light beam 7 and in the direction orthogonal to the recording track shown by the guide means 2, the focus of the light beam 7 coincides with and follows the guide means 2. ..

The guide means 2 may be a concentric guide groove, or a concentric circular guide groove and a non-recording portion having different light reflectances. It suffices that the follow-up control for the guide means 2 is performed by the reflected light.

In addition, the substrate 1 is preferably a non-magnetic material, may be an organic material or an inorganic material, and may be the same whether a transparent material or an opaque material is used, and the magnetic thin film 3 is formed by vapor deposition or coating. The guide means 2 may be formed together with this.

On the other hand, a spring-shaped arm 21 is fixed to the side of the holding cylinder 9 of the optical head 10 facing the magnetic thin film 3, and a magnetic head 24 is attached to the tip of the arm 21 via a load point 23 of a gimbal spring 22. The head 24 is swingably supported, the lower surface of the head 24 faces the recording track of the magnetic thin film 3, and while the recording medium 4 is rotating, the magnetic head 24 is levitated by the air flow corresponding to the relative speed of the recording medium 4. According to the electric signal transmitted to the coil 25, magnetic recording is performed on the magnetic thin film 3 in a non-contact manner.

The magnetization direction of the magnetic thin film 3 may be vertical or horizontal, and the magnetic head 24 is an arm that is a support.
21, a gimbal spring 22, a bulk type, a thin film type, a single pole type, and an auxiliary magnetic pole excitation type as long as they are floated by an air flow with a gap of about 0.01 to 0.1 μm provided between the thin film 3 and the magnetic thin film 3. , A ring type, or the like, and the generation of the levitation force is the same for both the positive pressure type and the negative pressure type.

Therefore, the focus matching control of the optical head 10 automatically determines the facing distance between the head 10 and the magnetic thin film 3, which is controlled in the range of 1 μm to several mm.
The corresponding gap between the magnetic head 24 and the magnetic thin film 3 is equal to the optical head.
Since the facing distance of 10 is taken as a reference and the range of about 0.01 to 0.1 μm is automatically determined by the arm 21, the gimbal spring 22 and the levitation force, the facing gap of the magnetic head 24 is maintained with high accuracy and the magnetic thin film 3 High-density recording can be performed on the recording track.

Further, when the recording medium 4 is stopped, the servo control is stopped, the optical head 10 is returned to the upper standby position, and the servo control is started in response to the start of rotation of the recording medium 4, the magnetic head
Since the magnetic head 24 and the magnetic thin film 3 are always in non-contact with each other, damage to the magnetic head 24 due to surface protrusions of the magnetic thin film 3 and abrasion due to friction between the magnetic head 24 and the like can be prevented. A lifetime is obtained.

On the other hand, the tracking of the recording track is performed by the guide means 2 and is optically performed by the tracking control of the optical head 10. Therefore, the pitch of the recording track can be set to be equal to that of the optical recording / reproducing system, and high recording can be performed. The track density is easily realized.

FIG. 2 is a timing chart showing the waveform of each signal, which realizes the non-contact state maintenance of the magnetic head 24 as described above.

That is, the control signal (a) for the drive motor of the recording medium 4 is given as a start signal at time t ₁ , and it is detected that the rotation speed signal (b) by the tachometer or the like connected to the motor has reached a predetermined value. Accordingly, after a delay time T from t ₁ , the control signal (c) to the servo section is given as a control start signal at time t ₂ , while at the time of stop, each control signal (a), (c) is applied at time t _3. At about the same time, it is given as a stop signal so that the optical head 10 is returned to the standby position.

Note that these controls can be easily realized by known means, and the control servo mechanism of the optical head 10 also
A light receiving element, a servo circuit, various driving means, and the like can be easily configured based on a well-known technique, and thus detailed description thereof will be omitted.

The information recorded on the recording track of the magnetic thin film 3 can be magnetically reproduced by the means shown in FIGS. 1 and 2, and the magnetic head 24 irradiates a light beam to the magnetic pole end to perform magneto-optical recording. If a material exhibiting a pickup effect is used, the reproduction can be performed magneto-optically, and therefore it is optional to use any means for the reproduction.

Therefore, recording / reproducing with high recording track density and high recording density is realized, and it becomes possible to record / reproduce a large amount of information freely, and it is possible to configure the whole at low cost without using special parts.

Further, when the magnetic head 24 is supported only by the arm 21 and the gimbal spring 22, the flying gap control range of the magnetic head 24 must be widened, and these cannot be made very small, but the optical head 10 is the standard. As described above, the flying gap control range may be about 1 μm at the maximum, which facilitates miniaturization of these.

In addition, if a guide groove is used as the guide means 2, the tracking control of the recording track becomes accurate, the side crosstalk with the adjacent recording track is significantly reduced, and the signal-to-noise ratio of the reproduction output is improved.

However, a light source 6 other than a laser oscillator may be used, and a half mirror may be used as the mirror 8 to transmit the reflected light and make it enter the light receiving element.
The recording medium 4 does not have a disk shape, but has a cylindrical shape or a long shape,
Alternatively, various modifications are possible such as fixing the recording medium 4 and moving the light beam 6 or the magnetic head 24.

〔The invention's effect〕

As is clear from the above description, according to the present invention, recording / reproducing with high recording track density and high recording density is realized, which is suitable for recording / reproducing a large amount of information, and therefore, in recording / reproducing various electric signals. The effect is obtained. Further, since the control range of the floating gap of the magnetic head can be reduced, the effect of facilitating downsizing can be obtained.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a fragmentary side view showing the structure of the present invention, and FIG. 2 is a timing chart showing the waveform of each signal. 1 ... Substrate, 2 ... Guide means, 3 ... Magnetic thin film, 4 ...
Recording medium, 6 ... Light source, 7 ... Light beam, 10 ... Optical head, 11 ... Lens, 12 ... Driving member, 13 ... Coupling member, 21 ... Arm, 22 ... Gimbal spring, 24 ... … Magnetic head.

Claims (1)

[Claims] 1. A recording track guide means formed on a recording medium together with a magnetic thin film is scanned by a light beam passing through an optical head, and the focal point of the light beam coincides with the guide means and is directed to the guide means. The optical head is controlled as a follower, and is supported by the optical head via a swingable support for defining a facing gap with the magnetic thin film, and the optical head is controlled by the focus matching control of the optical head. A recording / reproducing system characterized in that magnetic recording is performed on the magnetic thin film by a magnetic head whose gap is defined, and the recording is reproduced by either magnetic means or magneto-optical means.