JPH03203051A - Floating head of magneto-optical recording type recorder - Google Patents

Abstract

PURPOSE:To focus generated magnetic fields to a laser beam focusing surface by providing projecting lines forming peak parts on a floating surface. CONSTITUTION:The projecting lines 15 which consist of a soft magnetic material and project to an optical recording medium 8 side are provided in the optical path aperture 6 of the floating surface of a floating body 10 consisting of a soft magnetic material to form the floating head and are formed with the peak parts 14 of the thickness decreasing continuously from the outer peripheral side toward the front end of the inner peripheral side. The magnetic fields generated by a coil 5 are converged by this shape to the laser beam converging surface alpha by an objective lens 6, by which the electromotive force necessary for erasing is decreased and the recording and rewriting speeds are increased.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floating head of a magneto-optical recording device,
In particular, the present invention relates to an improvement in a floating head that can efficiently form a perpendicular magnetic field toward a convergence point of focused light on an optical recording medium.

[Prior Art] To explain the recording principle of this type of magneto-optical recording device, as shown in FIG. 16(A), a magnetic field is applied in the direction of the arrow to a recording film (a) made of a magnetic material. The Kerr rotation angle is changed by irradiating a laser spot and reversing the magnetization direction of the irradiated area, and this change in Kerr rotation angle is used to record and reproduce information (see Figure 16 (B)). ) At the same time, as shown in FIG. 16(C), a laser spot is irradiated onto the recording area of the recording film (a) with the direction of the magnetic field reversed from that during recording, and the magnetization direction of the irradiated area is changed. This is a method of erasing information by returning it to the state before recording.

By the way, as an optical head for recording, reproducing, and erasing information in this magneto-optical recording device, there is a
A floating head described in Japanese Patent No. 261052 is known.

That is, this floating head (b) is
As shown in the figure, an optical recording medium (
An air slider (bl) that floats due to the air flow accompanying the rotation of C), and a prism attached to this air slider (bl) that reflects laser light from a light source (d) such as a semiconductor laser toward the optical recording medium (c) side. (bl), and the laser beam attached to the optical path opening (b3) of the air slider (bl) and reflected by the prism (bl) is transmitted to the optical recording medium (
an objective lens (b4) that converges on the converging surface of c), and a groove (b5) provided along the optical path opening (b3) on the optical recording medium (c) side of the air slider (bl). Its main part is composed of a coil (b6) that is wound to form a magnetic field substantially perpendicular to the converging surface of the optical recording medium (c), and is moved in the radial direction of the optical recording medium (C) by a driving device (e). The optical recording medium (c) is supported by a spring-like suspension (b7) and is disposed near the optical recording medium (c).

In this floating head (b), the prism (
BL), objective lens (B4), coil (B6), and other minimal components are mounted on the air slider (BL), which has the advantage of reducing the weight of the head and shortening access time. 1. Optical recording media (C
) The air flow caused by the rotation of the air slider (bl
), it is possible to maintain a constant distance between the optical recording medium (C) and the air slider (bl), which has the advantage of omitting the focusing mechanism of the objective lens (b4). .

[Problems to be Solved by the Invention] By the way, in this type of floating head (b), the entire air slider (bl) is made of a soft magnetic material as described above, and therefore, as shown in FIGS. As shown in the figure, a magnetic path is formed on the optical path opening (b3) side and outside area of the air slider (bl) with the coil (b6) in between, so that the optical recording medium (C) is There is a drawback that it is difficult to concentrate the generated magnetic field toward the convergence point (α) of the laser beam.

Therefore, in order to form a magnetic field of 200 to 3000 e required for magneto-optical recording or erasing on the converging surface of the optical recording medium (C), it is necessary to apply a very large magnetomotive force, and in the past, the above-mentioned coil This was dealt with by increasing the number of turns of (b6).

However, when the number of turns of the coil (b6) is increased, the self-inductance also increases, making it impossible to reverse the direction of the magnetic field at high speed when recording or erasing information, resulting in a problem that the recording or rewriting speed decreases. there were.

Furthermore, in JP-A-61-71437, an improvement is made in which a soft magnetic layer is provided on the lower surface side of the recording film of an optical recording medium, and a magnetic path is formed between the soft magnetic layer and the coil to concentrate the perpendicular magnetic field. However, it is still not sufficient because it is not possible to concentrate the magnetic field toward the convergence point of the laser beam on the optical recording medium.

[Means for Solving the Problems] The present invention has been accomplished by focusing on the above-mentioned problems, and its object is to efficiently direct a perpendicular magnetic field toward a convergence point of focused light in an optical recording medium. The object of the present invention is to provide a floating head that can be formed.

In other words, the invention according to claim 1 includes: a floating body that is disposed near a rotating optical recording medium and floats due to the air flow accompanying the rotation of the optical recording medium; an objective lens that converges the focused light onto a convergence surface of the optical recording medium; and a magnetic field generating means that is attached near the optical path opening of the floating body and forms a magnetic field toward the convergence surface of the optical recording medium; The floating head of a magneto-optical recording device records or erases information by converging the focused light onto the converging surface of an optical recording medium while a magnetic field is generated by a generating means, and the floating body is made of a soft magnetic material. and is provided with a protrusion made of a soft magnetic material that protrudes toward the optical recording medium side along the opening edge of the optical path opening on the optical recording medium side, and the protrusion has a wall thickness that extends from the outer peripheral side. The invention is characterized in that a pointed portion is provided that becomes smaller continuously toward the tip on the inner circumferential side.On the other hand, the invention according to claim 2 is arranged near a rotating optical recording medium, and the optical recording medium is a floating body that floats due to the air flow accompanying the rotation of the medium; an objective lens that is attached to the optical path opening of the floating body to converge the focused light from the light source onto the convergence surface of the optical recording medium; and an objective lens for the optical path of the floating body. and magnetic field generating means attached near the opening to form a magnetic field toward the converging surface of the optical recording medium, and converging the focused light onto the converging surface of the optical recording medium while the magnetic field is generated by the magnetic field generating means. The floating head of a magneto-optical recording device that records or erases information is assumed to be a floating head, and the floating body is made of a cylindrical inner body formed of a soft magnetic material and provided with an optical path opening, and a non-magnetic material. and an outer body into which the inner body is fitted, and the thickness of the inner body is continuous from the outer circumference side to the inner circumference side tip part of the inner body on the optical recording medium side It is characterized by the provision of a pointed portion that becomes smaller in size.

In the invention according to claim 1, the soft magnetic material constituting the floating body and the convex is Mn-Z, as in the past.
N-ferrite, Ni-Zn ferrite, permalloy, etc. can be used, and the floating body and the protrusion may be made of the same soft magnetic material or different soft magnetic materials as desired. In addition, when the floating body and the protrusion are made of different types of soft magnetic materials, it is desirable that the protrusion is made of a soft magnetic material whose magnetic permeability is higher than that of the floating body.

In addition, regarding the protrusion provided along the opening edge of the optical path opening on the optical recording medium side, its tip should be slightly closer to the optical recording medium than the bottom of the floating body, within a range that does not interfere with the floating movement of the floating body. It may also be formed so as to protrude to. Note that the length and thickness of the protrusion may be set arbitrarily within a range that allows the formation of a pointed portion on the distal end side.

On the other hand, in the invention according to claim 2, the inner body is made of Mn-Zn ferrite, Ni-
It is necessary to construct this from a soft magnetic material such as Zn ferrite or permalloy.

Although there is no particular restriction on this shape, it is desirable to match the shape of the optical path opening in order to form a uniform magnetic field toward the optical path opening.

Further, regarding the pointed portion provided at the tip of the inner body on the optical recording medium side, as in the invention according to claim 1, the tip of the tip is attached to the floating body within a range that does not interfere with the floating movement of the floating body. It may be formed so as to protrude slightly from the bottom surface toward the optical recording medium side. In addition, when the thickness of the inner main body is set to be large, in order to concentrate the magnetic field to the convergence point of the optical recording medium, the pointed portion is made thinner than when the thickness is set to be thinner. It is preferable to set the angle small.

The outer body into which the inner body is fitted is made of glassy carbon, barium titanate, etc., in order to reduce the formation of a magnetic field toward the outer body and facilitate concentration of the magnetic field toward the optical path opening. It is necessary to construct this from a non-magnetic material such as calcium titanate or ceramics.

In addition, when the outer body is made of non-magnetic material such as calcium titanate or ceramics, it has the advantage of good workability. When the outer main body is constructed by using the optical recording medium, there is an advantage that the phenomenon of abrasion between the outer main body and the optical recording medium when they come into contact can be reduced.

Furthermore, there is no particular restriction on the method of fitting the inner body into the outer body, and the inner body may simply be fitted into the fitting portion of the outer body, or adhesive may be applied to these fitting surfaces. It is also possible to fit it in as desired.

Next, in the invention according to claims 1 and 2, at least a sliding surface and an air introduction surface are formed on the bottom side of the floating body in order to efficiently receive floating pressure from the optical recording medium. It takes. Further, for the purpose of stabilizing the floating movement of the floating body, a groove for letting air escape along the length of the floating body, that is, a central relief part may be formed. In this case, the number of grooves and their shape can be arbitrarily set depending on the purpose.

Further, in these inventions, the shape of the optical path opening is formed into a substantially circular shape according to the spot shape of the focused light, but when the inner wall surface of the optical path opening is provided with a slope toward the inside in the direction of incidence of the focused light. Since the magnetic field generating means attached near the optical path opening can be brought closer to the convergence point of the focused light on the optical recording medium, it is possible to further concentrate the magnetic field toward the convergence surface of the optical recording medium. It has the following advantages. Particularly, when the slope angle of the inner wall surface of the optical path opening is set to be between the convergence angle of the focused light and the path, the effect is remarkable because the magnetic field generating means and the convergence point can be brought closest to each other.

Further, at least the optical recording medium side in the optical path opening may be filled with a transparent filler made of a light-transmitting material such as resin such as PMMA or glass such as Corning 7059. When filled with such a filler, the bottom side of the optical path opening is closed and floating traveling becomes stable, and in addition, there are also the following advantages. That is,
The optical system of a floating head in a magneto-optical recording device generally uses the optical system of a floating head in a phase change recording device. However, in this phase change recording device, normally, focused light is irradiated from the transparent substrate side of the optical recording medium.
Since recording and erasing are performed by converging focused light onto the surface of the recording film, an objective lens is used that has a focal length that takes into account the refractive index of the transparent substrate. On the other hand, in magneto-optical recording devices, because it is necessary to form a strong magnetic field on the recording film surface of an optical recording medium, the focused light is directed directly onto the recording film surface without adopting a method of irradiating the focused light from the substrate side. Since a convergence method is adopted, if the objective lens is directly applied to a floating head of a magneto-optical recording device, the convergent light may not be properly converged onto the recording film surface. In such a case, by filling the above-mentioned optical path opening with a transparent filler made of a light-transmitting material having a refractive index equal to that of the transparent substrate, the light can be focused onto the recording film surface of the optical recording medium. It becomes possible to appropriately converge light.

Next, in these inventions, the magnetic field generating means such as a coil can be mounted at any position as long as it is near the optical path opening. For example, in the invention according to claim 1, the floating body has the optical path opening. The attachment may form a groove along the groove, and the attachment may be attached to the groove or to the inner wall surface of the optical path opening.On the other hand, in the invention according to claim 2, the outer body of the inner body It may be provided on the side adjacent to the optical path opening of the inner body, or it may be attached to the inner wall surface of the optical path opening of the inner body. However, in order to more efficiently concentrate the magnetic field toward the convergence surface of the optical recording medium, it is preferable to attach both to the inner wall surface of the optical path opening. When the magnetic field generating means is attached to the inner wall surface of the optical path opening, a stopper may be appropriately attached to the lower end side of the optical path opening in order to prevent the magnetic field generating means from falling from the optical path opening.

Furthermore, in the invention according to claim 1, the above-mentioned attachment is carried out on both the groove and the inner wall surface of the optical path opening, while in the invention according to claim 2, the attachment is carried out on the inner wall surface of the optical path opening of the inner body and the side adjacent to the outer body. Magnetic field generating means may be attached to both of the outer circumferential surfaces of the two.

When such a configuration is adopted, the magnetic field generated by the magnetic field generating means attached to the inner wall surface of the optical path opening, and the magnetic field generated by the magnetic field generating means attached to the outer peripheral surface of the side adjacent to the groove or the outer body. interfere with each other, making it possible to uniformly form a magnetic field with uniform strength on the convergence surface of the optical recording medium and its surrounding area. Therefore, even if the convergence point of the focused light is slightly shifted due to surface deflection of the optical recording medium, there is an advantage that the recording or erasing operation of information will not be hindered.

As for the reflecting member that reflects the focused light from the light source toward the optical recording medium, a prism, a reflecting mirror, etc. can be used as in the conventional case.

[Operation 1 According to the invention according to claim 1, the floating body is made of a soft magnetic material, and the floating body is made of a soft magnetic material that protrudes toward the optical recording medium side along the opening edge on the optical recording medium side of the optical path opening. In addition to providing a protrusion, this protrusion has a pointed part whose wall thickness decreases continuously from the outer circumferential side toward the inner circumferential tip, so that the magnetic flux is concentrated on the pointed part of the protrusion. As a result, it becomes possible to further concentrate the magnetic field toward the convergence point of the focused light in the optical recording medium.On the other hand, according to the invention according to claim 2, the floating body is formed of a soft magnetic material and used for the optical path. Consisting of a cylindrical inner body provided with an opening and an outer body formed of a non-magnetic material into which the inner body is fitted, the inner body is attached to the optical recording medium side end of the inner body. Since it has a pointed part whose wall thickness decreases continuously from the outer circumferential side to the inner circumferential tip, it is possible to reduce the formation of a magnetic path toward the outer body made of non-magnetic material. At the same time, the magnetic flux is concentrated on the pointed portion provided on the inner body, making it possible to further concentrate the magnetic field toward the convergence point of the focused light on the optical recording medium.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

◎First Example This example is an application of the invention according to claim 1.

That is, the floating head (1) according to this embodiment has the first
As shown in Figures 3 to 3, there is a floating body (10) supported by a spring-like suspension (2), and a floating body (10) supported by a spring-like suspension (2).
O) is attached to a coil (5) as a magnetic field generating means coexisting in the groove (13), an objective lens (12) and a prism provided in the optical path opening (6) of the floating body (10). (11) and a protrusion (15) provided along the opening edge of the optical path opening (6) and having a pointed portion (14) at its tip. be.

First, the floating body (10) is made of Mn-Zn ferrite, and as shown in Fig. 1, the air inflow end and the air outflow end on the bottom side of the floating body (10) are tapered (16) to smooth the inflow and outflow of air. +7) is provided, and a floating head (1) is provided in the center of the bottom side as shown in Figure 3.
) is provided with a central relief part (18) which stabilizes the floating running.

In addition, approximately in the center of the floating body (10), as shown in FIG. 3, a laser beam (
λ) to the magneto-optical disk (8) side is provided, and this optical path opening (6)
) is integrally provided with a protrusion (15) made of the same material as the floating body (10) that slightly protrudes toward the magneto-optical disk (8) along the opening edge, and this protrusion (1
5), the wall thickness is from the outer circumferential side to the inner circumferential tip (i.e.
A pointed portion (14) is formed which becomes continuously smaller toward the magneto-optical disk side.

On the other hand, above the optical path opening (6) of the floating body (10), a magneto-optical disk (8) is provided which is made of a glass material such as No. 7 to direct the laser beam (λ) from the semiconductor laser (7). ) side, and an objective lens (12) is fitted and attached to the side adjacent to the prism (11) in the optical path opening (6). .

Then, the floating body < I
O) is attached to the recess (19), and the floating head (1) according to this embodiment is disposed at a predetermined position. The drive device (9) is composed of a voice coil motor, etc., and the floating motor attached to the spring-like suspension (2) is controlled based on control signals such as tracking error signals inputted to the drive device (9). The head (1) is controlled to move onto a predetermined track on a magneto-optical disk (8).

The floating head (1) configured in this manner has the floating body (10) of 1 μm as the magneto-optical disk (8) rotates.
1 and 2, and as shown in FIGS. 1 and 2, the driving device rj
The laser beam (λ
) is incident and focused on the convergence surface of the magneto-optical disk (8) via the objective lens (12), while the floating body (10
) is installed by energizing the coil (5) wound in the groove (13), and the magneto-optical disk (8) is connected to the coil (5).
A recording operation is performed by applying a perpendicular magnetic field of 200 to 3000 e (that is, a magnetic field parallel to the optical axis of the laser beam) toward the converging surface of the magneto-optical disk (8), or by applying a perpendicular magnetic field of 200 to 3000 e toward the convergence surface of the magneto-optical disk (8). ) is incident on a photodiode (not shown) through the same optical path, and a reproduction operation is performed.

The floating head (1) according to this embodiment includes a protrusion (15) that is provided along the opening edge of the optical path opening (6) and slightly protrudes toward the magneto-optical disk (8). , and this protrusion (15) has a pointed part (15) whose thickness decreases continuously from the outer circumferential side to the inner circumferential tip
4) is formed, the magnetic flux from the coil (5) becomes concentrated on the pointed part (14) of this convex tube (15), as shown in Figures 4 (^) to (B). , it becomes possible to concentrate the magnetic field toward the convergence point (α) of the laser beam on the magneto-optical disk (8).

Therefore, it is possible to form a magnetic field of 2 (10 to 3 [100 e) required for magneto-optical recording or erasing on the convergence surface of the magneto-optical disk (8) without applying a large magnetomotive force as in the conventional case. , it becomes possible to reduce the number of turns of the coil (5) mounted on the floating head (1) and the supply current.

For this reason, the coil (5) mounted on the floating head (1)
This has the advantage that the self-inductance of the magnetic field is reduced, the direction of the magnetic field can be reversed at high speed when recording or erasing information, and the recording or rewriting speed increases.

In this embodiment, the protrusion (15) is formed to slightly protrude from the bottom surface of the floating body (1θ) toward the magneto-optical disk (8). As shown in B), it goes without saying that the protrusion (15) may be constructed so as not to protrude from the bottom surface of the floating body (10) in order to stabilize the floating movement.

◎Second Embodiment This embodiment is an application of the invention according to claim 2.

That is, the floating head (1) according to this embodiment has the sixth
As shown in Figures 7 to 7, an outer body (3) supported by a spring-like suspension (2);
Its main parts are composed of a ring-shaped inner body (4) fitted into the inner body (4) and a pointed part (41) provided at the tip of the inner body (4).

First, the outer body (3) is made of glass-like carbon, and as shown in Fig. 7, tapers (31) are provided at the air inflow end and the air outflow end on the bottom side to smooth the inflow and outflow of air. At the same time, a center relief part (33) is provided at the center of the bottom side to stabilize the floating movement of the floating head (1). In addition, as shown in FIG.
) is provided with a mounting opening (34) for mounting a coil (5), which is a magnetic field generating means, at the lower part of the inner peripheral surface of this mounting opening (34), as shown in FIG.
A groove (36) is provided for installation.

On the other hand, the inner main body (4) is a ring-shaped M n -Zn
The outer body (3) is made of ferrite.
The ring-shaped interior is configured as an optical path opening (6).

Furthermore, in order to attach the outer body (3), a coil (5) is wound and disposed on the outer peripheral surface of the inner body (4) at a portion corresponding to the groove (36), and this inner body ( A pointed portion (41) is formed at the optical end of the magneto-optical disk (8) of 4), the thickness of which decreases continuously from the outer circumferential side toward the inner circumferential tip.

In addition, the upper surface side of the inner body (4) fitted into the outer body (3) is made of a glass material such as BK 7, and reflects the laser light from the semiconductor laser toward the magneto-optical disk (8). While the prism (11) is attached, the prism (11) in the optical path opening (6) of the inner body (4) is attached.
) and an objective lens (12) is fitted and attached to the side adjacent to the lens (12).

Then, as in the first embodiment, the distal end side of the spring-like suspension (2), which is attached to the drive device at its proximal end, is attached to the outer body (3), and the floating head (1) is placed in a predetermined position. It is set up.

The floating head (1) configured in this way moves between the outer body (3) and the inner body (4) as the magneto-optical disk (8) rotates.
) floats by about 1 μm, and the laser beam (λ) is incident on the prism (11) surface of the floating head (1) and passes through the objective lens (12) to the magneto-optical disk ( 8), while the current is applied to the coil (5) wound around the outer peripheral surface of the inner body (4) below the objective lens (12), this coil (5)
200-3 towards the converging surface of the magneto-optical disk (8)
A perpendicular magnetic field of 000e is applied to perform the recording operation, or a laser beam reflected from the magneto-optical disk (8) surface (
λ) is incident on the photodiode side through the same optical path, and a reproduction operation is performed.

In the floating head (1) according to this embodiment, the floating body (10) is formed of an inner body (4) formed of Mn-Zn ferrite and provided with an optical path opening (6).
), and the inner body (
4) and the outer body (3) into which the 8th Diagram (A
), it is possible to concentrate the magnetic field toward the convergence surface of the magneto-optical disk (8), and furthermore, the inner body (
4) is provided with a pointed part (41) on the distal end side, as shown in Fig. 8(
As shown in B), the magnetic flux from the coil (5) is concentrated on this pointed portion (41), so that the magneto-optical disk (
It becomes possible to further concentrate the magnetic field toward the convergence point (α) of the laser beam in 8).

Therefore, it is possible to form a magnetic field of 200 to 3000 e required for magneto-optical recording or erasing on the convergence surface of the magneto-optical disk (8) without applying a large magnetomotive force as in the conventional case. ) The number of turns of the coil (5) mounted on the coil (5) and the supplied current can be reduced.

For this reason, the coil (5) mounted on the floating head (1)
This has the advantage that the self-inductance of the magnetic field is reduced, the direction of the magnetic field can be reversed at high speed when recording or erasing information, and the recording or rewriting speed increases.

Here, the solid line in FIG. 9 indicates the vicinity of the convergence surface of the magneto-optical disk (
The broken line shows the relative magnetic field strength distribution formed near the convergence surface of the magneto-optical disk (same as in the example) by the coil mounted on the conventional floating head. The relative magnetic field strength distributions formed at the positions of 2 and 3 are shown, and it can be seen that in the floating head according to the example, the magnetic field strength on the convergent surface increases as the magnetic field concentrates on the convergent surface.

The horizontal axis in FIG. 9 indicates the distance (in μm) from the center of the laser spot focused on the magneto-optical disk.

◎Third Embodiment As shown in FIG. 10 (^), the floating head according to this embodiment has a structure on the inner wall surface of the optical path opening (6) of the inner body (4).
The point where a slope is set between the path and the convergence angle of the laser beam (λ) toward the inside in the direction of incidence of the laser beam (λ), and the formation of this slope causes the outer body ( 3)
The space between the floating head and the path according to the second embodiment is the same, except that the mounting opening (34) is also sloped.

The floating head according to this embodiment also has the same advantages as the second embodiment, since the formation of a magnetic path toward the outer body (3) made of non-magnetic material can be reduced. Since the tip of the pointed portion (4I) provided on the inner body (4) is directed toward the convergence point (α) of the laser beam on the magneto-optical disk (8), this pointed portion (41
) (see FIG. 10(B)) can be further concentrated toward the convergence point (α) of the laser beam.

In addition, in the first and second embodiments, the coil as the magnetic field generating means is mounted in the groove (13) provided on the floating body (10).
) or wound around the outer peripheral surface of the inner main body (3), but as shown in FIG. 11, it may be attached to the inner wall surface of the optical path opening (6). As shown in FIG. 12, it may be attached to both the inner wall surface of the inner body (4) and the outer peripheral surface of the inner body (4).

◎Fourth Embodiment As shown in FIG. 13, the floating head according to this embodiment has a P
This is the space between the floating head and the track according to the second embodiment, except that it is filled with a transparent filler (60) made of MMA.

The floating head according to this embodiment also has the same advantages as the second embodiment, and also has an optical path opening (6).
Since the side of the magneto-optical disk (8) is closed with the transparent filler (60), the floating head (1) can fly stably and has the following advantages. That is, the optical system of the floating head in this type of magneto-optical recording device is generally the optical system of the floating head in a phase change recording device. However, in this phase change recording device, as shown in FIG.
81) A method is adopted in which recording and erasing is performed by irradiating laser light (λ) from the transparent substrate (82) side and converging the laser light (λ) onto the recording film (83) surface. An objective lens having a focal length that takes into account the refractive index of (82) is used.

Therefore, when this objective lens is directly applied to a floating head of a magneto-optical recording device, the laser beam (λ) may not be properly focused on the recording film surface.

Therefore, the transparent substrate (82) is placed inside the optical path opening (6).
By filling the transparent filler (6o) with the same refractive index as the laser beam (λ), the laser beam (λ)
Recording 111 [(83) of the magneto-optical disk (8) via
Since it is converged on a plane, it has the advantage of being able to eliminate the above-mentioned disadvantages.

Incidentally, as shown in FIG. 14, a configuration may be adopted in which a transparent filler (60) is filled in the optical path opening (6) of the inner main body (4) provided with a slope.

[Effects of the Invention] According to the invention according to claim 1, the floating body is made of a soft magnetic material, and the floating body is made of a soft magnetic material that protrudes toward the optical recording medium side along the opening edge on the optical recording medium side of the optical path opening. In addition to providing a white butterfly made of material, this white butterfly is also provided with a pointed part whose wall thickness decreases continuously from the outer circumferential side to the inner circumferential tip, so that magnetic flux is generated in the pointed part of the white butterfly. As a result, it becomes possible to further concentrate the magnetic field toward the convergence point of the focused light on the optical recording medium.On the other hand, according to the invention according to claim 2, the floating body is formed of a soft magnetic material. It consists of a cylindrical inner body provided with an opening for an optical path, and an outer body formed of a non-magnetic material into which the inner body is fitted, and this Since the inner body has a pointed part where the wall thickness decreases continuously from the outer circumferential side to the inner circumferential tip, it reduces the formation of a magnetic path toward the outer body made of non-magnetic material. At the same time, the magnetic flux is concentrated on the pointed portion provided on the inner body, making it possible to further concentrate the magnetic field toward the convergence point of the focused light on the optical recording medium.

Therefore, it is possible to form a strong magnetic field required for magneto-optical recording or erasing on the convergence surface of the optical recording medium without applying a large magnetomotive force as in the conventional case, so the coil mounted on the floating head, etc. It is possible to reduce the number of windings and the supply current, which has the effect of increasing the recording or rewriting speed.

[Brief explanation of drawings]

1 to 14 show embodiments of the present invention.
The figure is a perspective view of the floating head according to the first embodiment, FIG. 2 is a sectional view taken along the line ■-■, FIG. ) is an explanatory diagram of the operation of this floating head, Fig. 4 (B) is a partially enlarged view, and Fig. 5
Figure (^) is a cross-sectional view of the floating head according to the modified example.
Figure (B) is a partially enlarged view, Figure 6 is a sectional view of the floating head according to the second embodiment, Figure 7 is a partial perspective view of the floating head with a part of the structure omitted, and Figure 8 (^ ) is an explanatory diagram of the operation of this floating head, FIG. 8(B) is a partially enlarged view thereof, FIG. 9 is a diagram of the relative magnetic field strength distribution formed near the converging surface of the magneto-optical disk, and FIG. 10 (^ ) is a sectional view of the floating head according to the third embodiment, FIG. 10(B) is a partially enlarged view thereof, and FIGS. FIG. 13 is a cross-sectional view of a floating head according to the fourth embodiment, FIG. 14 is a cross-sectional view of a floating head according to a modification thereof, and FIG. 15 is a schematic bottom perspective view of an optical disk applied to a phase change recording device. and also the first
Figures 6 (^) to (C) are explanatory diagrams of the recording principle in a magneto-optical recording device, Figure 17 is a perspective view of a floating head in a conventional magneto-optical recording device, and Figure 18 is a partially enlarged view. 19 is a sectional view taken along the line XIX-XIX of FIG. 17, FIG. 20 is an explanatory diagram of the operation of this conventional floating head, and FIG. 21 is a partially enlarged view thereof. [Description of symbols] (1)...Floating head (3)...Outer body (4)...Inner body (5)...Coil (6)...Optical path opening (7)...・Semiconductor laser (8)...Magneto-optical disk (10)...Floating body (11)...Prism (I2)...Objective lens (14) (41)...Pointed part (15) ... convexity

Claims (2)

[Claims] (1) A floating body that is placed near a rotating optical recording medium and floats due to the air flow accompanying the rotation of the optical recording medium, and a floating body that is attached to the optical path opening of the floating body and directs the focused light from the light source to the optical recording medium. and a magnetic field generating means attached near the optical path opening of the floating body to form a magnetic field toward the converging surface of the optical recording medium, the magnetic field generating means forming a magnetic field. In a floating head of a magneto-optical recording device that records or erases information by converging the focused light onto a converging surface of an optical recording medium in a state where the optical recording medium is A protrusion made of a soft magnetic material that protrudes toward the optical recording medium is provided along the opening edge of the opening on the optical recording medium side, and the thickness of the protrusion is continuous from the outer circumferential side to the inner circumferential tip. A floating head for a magneto-optical recording device, characterized in that it is provided with a pointed portion that becomes smaller in size. (2) A floating body that is placed near the rotating optical recording medium and floats due to the air flow accompanying the rotation of the optical recording medium, and a floating body that is attached to the optical path opening of the floating body and directs the focused light from the light source to the optical recording medium. and a magnetic field generating means attached near the optical path opening of the floating body to form a magnetic field toward the converging surface of the optical recording medium, the magnetic field generating means forming a magnetic field. In a floating head of a magneto-optical recording device that records or erases information by converging the focused light on the converging surface of an optical recording medium in a state where the floating body is made of a soft magnetic material and is formed of an optical path opening A cylindrical inner body provided with A floating head for a magneto-optical recording device, characterized in that it has a pointed portion whose thickness decreases continuously from the outer circumferential side to the inner circumferential tip.