JPH06131736A - Head for magneto-optical recording - Google Patents

Abstract

PURPOSE:To prevent the generation of rolling of a sliding part due to the mounting of a flexible printed board. CONSTITUTION:A head main body 24 having a sliding part 23 is mounted at the tip of a leaf spring member 22 whose basic end is fixed on a fixing body 21. A flexible printed board(FPC) 27 is connected between the fixing body 21 and the head main body 24 and the center line of the freely bending part 27b of the FPC 27 is made coincident with the center line of the head main body 24 in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical recording head which contacts and slides on a magneto-optical recording medium to perform magneto-optical recording.

[0002]

2. Description of the Related Art One of so-called writable optical disks that can write, erase and read information using a light beam is called a magneto-optical disk as a magneto-optical recording medium. .

As shown in FIG. 9, this magneto-optical disk 1
Is provided with a magneto-optical recording layer 4 made of a perpendicularly magnetized film on a transparent substrate 2 via a SiN protective film 3, and a metal thin film such as an Al thin film on the magneto-optical recording layer 4 via a SiN protective film 5. A reflective film 6 is laminated, and a protective film 7 made of an ultraviolet curable resin or the like is further formed on the reflective film 6.

As a method of recording information on the magneto-optical disc 1, a magnetic field modulation method, an optical modulation method and the like are known.
The magnetic field modulation method enables so-called overwriting in which a new signal is overwritten on an old signal. In this magnetic field modulation type magneto-optical recording, as shown in FIG. 10, an optical pickup for irradiating a laser beam 11 is arranged on the substrate 2 side of a magneto-optical disk 1 having a magneto-optical recording layer of a perpendicular magnetization film, and a protective film is provided. Magnetic core 13 with coil 12 wound around 7 side
By arranging the head element 13 having a, the laser spot 11a of the laser light 11 emitted from the optical pickup is located on the center line of the head element 13, and the direction of the current flowing through the coil 12 is changed, The direction of the magnetic field emitted is changed.

The magneto-optical disk 1 is rotated at a predetermined rotation speed with its center as the center of rotation. Then, a magnetic field corresponding to the recording signal is formed in the vicinity of the laser spot 11a, so that the desired rewrite portion 1a of the magneto-optical disk 1 is heated to a Curie temperature or higher and demagnetized by the laser spot 11a. After that, when the rewritable portion 1a moves from the laser spot 11a and drops below the Curie temperature, it is magnetized in the magnetic field direction for recording.

The head element 13 is held in a head body made of plastic or the like, and the head body is integrally provided with a sliding portion for directly sliding contact with the magneto-optical disk 1. The head body is attached to the tip of a leaf spring material whose base end is fixed to a fixed body, so that the head body can follow the surface deviation of the disk 1.

A flexible printed circuit board (FPC) is connected between the head body and the fixed body.
A signal from the outside is sent to the coil 12 in the head body. Further, one end of the FPC is fixed to a fixed base, and an intermediate portion reaching the head body is a free bending portion provided along the leaf spring material.

[0008]

In the above configuration,
If the FPC's own weight or reaction force due to deflection is applied on the center line of the head body and its direction does not match the pressing force of the leaf spring material, the sliding part integrated in the head body may cause rolling. It was As a result, there has been a problem that the sliding surface of the sliding portion comes into one-side contact with the disk, causing uneven wear and deviation of the center position between the generated magnetic field and the optical pickup.

The present invention has been made in view of such circumstances, and prevents the rolling portion from rolling due to the mounting of the FPC, and prevents the rolling portion from rolling during the recording operation. It is an object of the present invention to provide a magneto-optical recording head that can maintain its posture.

[0010]

A magneto-optical recording head according to the present invention has a leaf spring member 22 whose base end is fixed to a fixed body 21.
A head body 24 attached to the tip of the leaf spring material 22 for applying a magnetic field to the magneto-optical disk 1 as a magneto-optical recording medium; and a free bending portion 27b having one end fixed to the fixed body 21.
In the magneto-optical recording head including the FPC 27 as a flexible printed circuit board, the other end of which is connected to the head main body 24 via the center line of the head main body 24 in the axial direction.
It is characterized in that the center line of the free-bending portion 27b of the PC 27 is made coincident.

[0011]

In the magneto-optical recording head having the above structure, when the head main body 24 slides on the disk 1 through the sliding portion 23 and is displaced in the vertical direction, the FPC 27 and the head main body 2 are also moved.
Displacement accompanies the movement of 4 and a deflection occurs. The reaction force of this bending is applied to the head main body 24, but the axial center line of the head main body 24 and the free bending portion 27b of the FPC 27 are used.
Since the center line of the FP is the same, the head body 24 and the FP
Rolling does not occur only with parallel movement with C27. As a result, the sliding portion 2 integrated with the head body 24
It is possible to prevent uneven wear of the disk 3 caused by one-side contact with the disk 1 and deviation of the generated magnetic field from the center line of the optical pickup.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magneto-optical recording head of the present invention will be described below with reference to the drawings.

1 and 2 show the configuration of an embodiment of the present invention. In FIG. 1, one end of a leaf spring material 22 is fixed to the fixed portion 21, and the sliding portion 2 is attached to the other end of the leaf spring material 22.
The head main body 24 is attached via 3. The head body 24 is formed integrally with the sliding portion 23, and has a magnetic core around which a coil (not shown) is wound. The sliding portion 23 is pressed against the disk surface with an appropriate load by the urging force of the leaf spring material 22.

One end of an arm 25 is integrally fixed to one side of the fixed portion 21, and the arm 25 extends along the leaf spring material 22 to reach the head body 24. Further, a locking portion 26 is provided at the tip of the arm 25, and the locking portion 26 locks the tip of the leaf spring material 22.
It defines the free height of the head body 24 when the head is not in use and is spaced from the disk surface.

The FPC 27 has a connecting portion 27a for connecting to external wiring.
Is attached to the base end of the arm 25, and the connecting portion 2
A free bending portion 27b extends from 7a toward the head body 24. In addition, as shown in FIG.
As shown in, the land portion 27c is provided, and is connected to the terminal 28 of the head body 24 by soldering through the elongated hole 27d formed in the land portion 27c. Here, the center line of the free bending portion 27b coincides with the center line of the head body 24 in the X direction. A reinforcing plate 29 is bonded to the FPC 27 except for the free-bending portion 27b and the land portion 27c.
An adhesive 30 is applied to the lower surface attached to the sheet 5.

Next, the operation of this embodiment will be described. FPC2
The free bending portion 27b of 7 is the head body 24 of the FPC 27.
After connecting to, it can be displaced in the vertical direction (Z direction) on the center line in the X direction. Therefore, the head body 24
When sliding on the disk 1 via the sliding portion 23,
The FPC 27 is also displaced along with the movement of the sliding portion 23 due to the surface wobbling of the disk 1 or the like, and a deflection is generated, and the reaction force acts on the head main body 24. At this time, as shown in FIGS. 3 and 4, since the fixed end 27e of the free bending portion 27b is on the axial centerline 31 of the head body 24, when the head body 24 moves up and down in the ZZ direction, The FPC 27 also translates in the same direction, but no rolling occurs.

On the other hand, as shown in FIGS. 5 and 6, when the center line 32 of the free bending portion 27b in the X direction does not coincide with the center line of the head body 24, another free bending portion 27f in the Y direction is formed. Will be needed. For this reason, when the head body 24 is displaced in the Z direction, the free bending portion 27f makes a curvilinear motion in the Y direction as shown by an arrow AA. As a result, the twist shown by the arrow BB is generated in the free bending portion 27b, and the head body 24 is rolled.

The fixed end 27e of the free-bending portion 27b as shown in this embodiment corresponds to the center line 31 of the head body 24 in the X direction.
When the head body 24 was moved up and down in the Z direction with a stroke of 2 mm using the head above, no rolling was observed. On the contrary, fix the fixed end 27e from the center line 31 to 4
When the FPC 27 moved by mm is used, when the head body 24 is similarly moved up and down, the head body 24 and the sliding portion 2 are moved.
3 was tilted in the Y direction by 2 ° to 3 °, and the occurrence of rolling was confirmed.

FIG. 7 shows an FPC 2 according to another embodiment of the present invention.
7 shows the configuration of No. 7. In the present embodiment, the wiring pattern of the free bending portion 27b is symmetrically divided into two in the Y direction with the center line 31 of the head body 24 in the X direction as the center. In this case, since the distance between the two patterns and the center line 31 is equal, the shape center line of the free bending portion 27b coincides with the center line 31 of the head body 24. Therefore, as shown in FIG. 8, the force due to the vertical movement of the head main body 24 in the ZZ direction,
The force due to the displacement of the FPC 27 becomes the same ZZ direction,
It only translates in this direction, no rolling occurs. In this embodiment, the fixed end 27e of the free bending portion 27b has two points, and the free bending portion 27b is supported at these two points, so that the rolling of the head main body 24 during operation can be more reliably suppressed. You can

[0020]

As described above, according to the magneto-optical recording head of the present invention, the center line of the head main body in the axial direction coincides with the center line of the free bending portion of the flexible printed circuit (FPC). Therefore, it is possible to prevent rolling of the head body during mounting and sliding of the FPC, and to prevent uneven wear of the sliding portion and deviation of the center position between the generated magnetic field and the optical pickup. it can.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of an embodiment of a magneto-optical recording head of the present invention.

FIG. 2 is a perspective view showing the configuration of the FPC of FIG.

FIG. 3 is a perspective view illustrating the operation of the present embodiment.

FIG. 4 is a front view of FIG.

FIG. 5 is a perspective view illustrating an operation of an example of a conventional head.

FIG. 6 is a front view of FIG.

FIG. 7 is a plan view showing the structure of an FPC according to another embodiment of the present invention.

FIG. 8 is a front view for explaining the operation of the embodiment shown in FIG.

FIG. 9 is a cross-sectional view showing the configuration of an example of a magneto-optical disk.

FIG. 10 is an explanatory diagram of a magnetic field modulation method.

[Explanation of reference numerals] 21 fixed body 22 leaf spring material 24 head body 27 FPC (flexible printed circuit board) 27b free bending portion

Claims (1)

[Claims] 1. A leaf spring material having a base end fixed to a fixed body, a head body attached to a tip end of the leaf spring material to apply a magnetic field to a magneto-optical recording medium, and one end fixed to the fixed body. In a magneto-optical recording head, the other end of which is connected to the head body via a bent portion, wherein a centerline in the axial direction of the head body and the flexibility of the flexible printed board are provided. A magneto-optical recording head characterized in that the center line of the bent portion is aligned.