JPS6236760A - Recording and reproducing system - Google Patents

Abstract

PURPOSE:To attain a recording/reproducing system with high recording track density and high recording density by scanning a guide means with the light beam given from an optical head, securing the coincidence between the focal point of the light beam and a magnetic thin film as well as the follow-up of said focal point to the guide means under the control of the optical head and using a magnetic head to support the optical head. CONSTITUTION:A light beam 7 is reflected by a guide means 2 and condensed condensed by a lens 11 and also made incident on a photodetecting element via a mirror 8. In response to these conditions, a servo mechanism works to control an optical head 10 in the direction along the beam 7 and in the direction orthogonal to a recording track shown by the means 2 via a drive member 12 and a coupling member 13. As a result, the focal point of the beam 7 is coincident with the means 2 and also follows the means 2. Thus the space between the head 10 and a magnetic thin film 3 is set automatically by the control for coincidence secured between the head 10 and the focal point of the beam 7. As a result, the space of a magnetic head 24 is maintained with high accuracy. This secures a recording process with high density onto a recording track of the film 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for recording and reproducing various electrical signals.

[Conventional technology]

Conventionally, as methods for recording and reproducing electrical signals, the magnetic recording and reproducing method, the optical recording and reproducing method, and the heating magnetic recording and reproducing method disclosed in Japanese Patent Publication No. 54-95250 have become common. ing.

[Problem that the invention seeks to solve]

However, in the magnetic recording and reproducing method, 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/Jm, and the density of the recording track can be made even higher. This is causing problems that make it difficult to do so.

In addition, in the optical recording/reproduction method, the pitch of the recording track can be as high as about 2 μm, whereas the recording density on the recording track causes mechanical deformation, so the recording pitch can be as high as about 2.5 μm. , the problem arises that high recording density cannot be obtained.

On the other hand, in the heating magnetic recording/reproducing method, the temperature of the recording site is raised by laser beam irradiation, and then recording is performed by applying a magnetic field. In addition, since the magnetic field is applied near the tip of this lens, compared to magnetic recording and reproducing methods,
This brings about a problem in which the recording density on the recording track decreases.

Therefore, in each of the conventional methods, it is not possible to obtain both high recording track density and high recording density at the same time, and there is a strong demand for a method that can further improve both densities and perform large-capacity recording and reproduction. It has reached this point.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention is constructed by the following means.

In other words, the optical head scans a recording track guide means formed together with a magnetic thin film on a recording medium with a light beam passing through an optical head, and the focus of the light beam coincides with the guide means and follows the guide means. A magnetic head facing the magnetic thin film supported by the optical head performs magnetic recording on this magnetic thin film, and this recording is reproduced by either magnetic means or magneto-optical means. I take it as a thing.

[Action]

Therefore, the guide means is scanned by the light beam passing through the optical head, and by corresponding control of the optical head, the focus of the light beam coincides with the magnetic thin film and follows the guide means, and Since the magnetic head is supported by the optical head, magnetic recording is performed on the magnetic thin film along the guide means, and this can be freely reproduced by magnetic means or magneto-optical means.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

FIG. 1 is a cutaway side view of the main parts showing the structure, showing a flexible or non-flexible disk-shaped substrate 1, recording track guide means 2 formed on the upper surface of this, and further the upper surface of this. A recording medium 4 is constituted by the magnetic thin film 3 formed on υ,
These are rotated in the direction of the arrow by a motor not shown in the figure.

Further, a light source 6 such as a laser oscillator is provided, and a light beam T such as a laser light beam projected from the light source 6 is transmitted to a mirror 8.
The optical path is bent by this, and is projected onto the magnetic thin film 3 via the lens 11 that constitutes the optical head 10 together with the holding cylinder 9.
The light is reflected by the lens 11 and enters the light receiving element (not shown) through the mirror 8. Depending on this situation, the servo mechanism (not shown) operates, and the driving member 12 and the coupling member 13 in order to control the optical head 10 in a direction along the light beam T and in a direction perpendicular to the recording track indicated by the guide means 2, so that the focus of the light beam T coincides with the guide means 2 and the same means 2 It will follow.

The guide means 2 may be a concentric guide # or a concentric guide with different light reflectances between the recording track portion and the non-recording portion.
Any device may be used as long as the guide means 2 is subjected to follow-up control using the reflected light of the light beam T.

Further, the substrate 1 is preferably made of a non-magnetic material, but may be made of an organic material or an inorganic material, and may be made of either a transparent material or an opaque material, and the magnetic thin film 3 is formed by vapor deposition or coating. However, the guide means 2 may be formed together with this.

On the other hand, the holding cylinder 9 of the optical head 10 has its magnetic thin film 3
A spring-like arm 21 is fixed to the side opposite to the magnetic head 24 , and a magnetic head 24 is swingably supported at the tip of the arm 21 via a load point 23 of a gimbal spring 22 . is opposed to the recording track of the magnetic thin film 3, and while the recording medium 4 is rotating, the magnetic head 24 is levitated by an air flow corresponding to the relative speed with this, and the magnetic thin film is 3, magnetic recording is performed in a non-contact manner.The magnetization direction of the magnetic thin film 3 may be either vertical or horizontal, and the magnetic head 24 is supported by an arm 21 and a gimbal spring 22. If it floats due to airflow with a gap of about 0.01 to 0.1 μm between the magnetic thin film 3 and the It may be of any shape, and the generation of floating blades is the same for either the positive pressure type or the negative pressure type.

Therefore, by controlling the number of focal points of the optical head 10, the facing distance between the optical head 10 and the magnetic thin film 3 is automatically determined, and this is NIL controlled in the range of about 1 μm to several mm. The opposing gap between the arm 21 and the magnetic thin film 3 is based on the opposing gap between the optical head 10.
, υ due to the gimbal spring 22 and the floating blade, 0.01 to 0
．． Since the range is automatically determined to be about 1 μm, the gap between the magnetic heads 240 is maintained with high accuracy, and high-density recording can be performed on the recording tracks of the magnetic thin film 3.

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 recording medium 4 is stopped.
If servo control is started in response to the start of rotation, the magnetic head 24 and the magnetic 'R' film 3 can be kept stationary.
High reliability and long service life of all equipment is achieved.

On the other hand, since the tracking of the recording track is performed by the guide means 2 and optically by the tracking control of the optical head 10, it is possible to freely set the pitch of the recording track in the same manner as in the optical recording/reproducing method, and the pitch of the recording track can be set at will. Density is easily achieved.

FIG. 2 is a timing chart showing the waveforms of each signal, which allows the magnetic head 24 to maintain the non-contact state as described above.

That is, a control signal (resistance) for the drive motor of the recording medium 4 is given as a start signal at time 11, and it is detected that the rotation speed signal (b) from a tachometer or the like connected to the motor has reached a predetermined value. Accordingly, after a delay time T from tl, a control signal (C) is given to the servo system as a control start signal at time t2, while at the time of stopping, each control signal (a), (c) is given at the same time at time tslc. The optical head 10 is given as a stop signal to return the optical head 10 to the standby position. Note that these controls can be easily realized by known means.
The servo mechanism for controlling the optical head 10 can also be easily configured using a light receiving element, a servo circuit, various drive means, etc. based on well-known technology, and therefore its details will be omitted.

Furthermore, the information recorded in the recording trunk of the magnetic thin M3 as described above can be reproduced magnetically using the means shown in FIGS. Since reproduction can be carried out magneto-optically by using a device that exhibits a pickup effect, it is optional to use any means for reproduction.

Therefore, high recording track density and high recording density recording and reproduction are realized, and it becomes possible to freely record and reproduce large amounts of information, and the entire structure can be constructed at low cost without using special parts. If 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 much smaller; however, since the optical head 10 is used as a reference,
The flying gap control range may be about 1 μm at most as described above, making it easy to miniaturize these devices.

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

However, it is also possible to use something other than a laser oscillator for the light source 6, and it is also possible to use a half mirror as the mirror 8 to transmit the reflected light and make it enter the light receiving element.
The recording medium 4 is not disk-shaped but cylindrical or elongated,
Alternatively, the recording medium 4 is fixed and the light beam 6 to the magnetic head 24
[Effects of the Invention] As is clear from the above explanation, according to the present invention, high recording track density and high recording density recording and reproduction can be realized. Since it is suitable for recording and reproducing large amounts of information, remarkable effects can be obtained in recording and reproducing various electrical signals.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a cutaway side view of the main parts showing the configuration, and FIG. 2 being a timing chart showing the waveforms of each signal. 1. Fist substrate, 2. 0. Guide means, 3. Life... Magnetic thin film, 4. Recording medium, 6. Fist light source) T...φ
・Light beam, 10: Optical head, 11: Lens, 12: Fighting/driving member, 13: Fist/coupling member,
21... war arm, 22 es gimbal spring, 24
・Φ・・Magnetic head.

Claims (1)

[Claims] scanning a recording track guide formed on a recording medium together with a magnetic thin film with a light beam passing through an optical head;
The optical head is controlled so that the focus of the light beam coincides with the guiding means and follows the guiding means, and the magnetic thin film is directed to the magnetic thin film by the magnetic head facing the magnetic thin film supported by the optical head. A recording/reproducing method characterized in that magnetic recording is performed on a target, and the recording is reproduced by either magnetic means or magneto-optical means.