JPH0527801U - Magnetic head for magneto-optical recording - Google Patents

Abstract

(57) [Abstract] [Purpose] In a magnetic head for magneto-optical recording, the magneto-optical disk is prevented from being damaged when it is brought into contact and sliding contact with the magneto-optical disk, and at the same time, the manufacturing and assembling are facilitated and downsized . A magnetic head main body 16 having a sliding portion 15 facing the magneto-optical disc 1, a bobbin 14 having a coil 13 wound around a magnetic core 12, and an elastic support 17 for holding the magnetic head main body 16 are provided. A wiring pattern 22 serving as a lead wire of the coil 13 is formed on one surface of the elastic support body 17.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head for magneto-optical recording.

[0002]

[Prior Art]

 Conventionally, as a recording method for a magneto-optical disk, a magnetic field modulation type magneto-optical recording method capable of overwriting by writing a new signal on an old signal is known. In this recording system, as shown in FIG. 5, an optical pickup which irradiates a laser beam 2 on one side with a magneto-optical disc 1 having a magneto-optical recording layer of a perpendicular magnetization film sandwiched therebetween and the other on the other side are synchronized with the laser spot. The moving magnetic field generating means, that is, the magnetic head 3 is arranged and the direction of the magnetic field is changed by changing the direction of the current flowing through the magnetic head 3. Then, a magnetic field corresponding to the recording signal is formed in the vicinity of the laser spot, so that the rewritable portion 1A of the disk 1 is heated to a Curie temperature or higher by the laser spot 2a and demagnetized, and then moved from the laser spot 2a. When the temperature drops below the Curie temperature, the recording is performed by magnetizing in the above magnetic field direction.

The conventional magneto-optical disk 1 is a non-contact medium, and therefore the magnetic head 3 is arranged apart from the disk 1 by a necessary and sufficient distance d.

[0004]

[Problems to be solved by the device]

 The present applicant has previously developed an ultra-small digital recording / playback device capable of digital recording / playback using an ultra-small magneto-optical disk. The other recorder / reproducer adopts the magnetic field modulation type magneto-optical recording method to enable overwriting.

By the way, since the conventional magneto-optical disk records in a non-contact manner as described above, the magnetic head 3 for magneto-optical recording follows the surface wobbling of the disk 1 caused by the rotation while being separated from the disk 1. Is attached to the electromagnetic servo mechanism. For this reason, there are limits to the reduction of power consumption and the downsizing of equipment (especially to reduce the thickness of equipment) in a recording / reproducing device that employs a non-contact method with respect to a magneto-optical disk.

Therefore, if the conventional idea is reversed and the magnetic head is brought into contact-sliding contact with the magneto-optical disk, only a simple elastic support is required to support the magnetic head, and the conventional volume is taken. The electromagnetic servo mechanism can be omitted, which is advantageous for reducing the power consumption of the recording / reproducing device and downsizing the device.

However, in the magneto-optical disk 1 itself, as shown in FIG. 6, a magneto-optical recording layer 6 made of a perpendicular magnetization film is formed on a base 5, and a protective film 7 made of an ultraviolet curable resin is further formed thereon. Is configured. When the magnetic head 3 having a ferrite core is brought into contact with and slid on the magneto-optical disk 1 as described above, there is a fear that the magneto-optical disk 1 may be damaged due to poor compatibility between the ferrite core and the protective film 7. On the other hand, it is desired that such a magnetic head be easy to manufacture and assemble even if it is downsized, and have high reliability.

In view of the above points, the present invention provides a magnetic head for use in a magnetic field modulation magneto-optical recording method, which enables contact and sliding on a recording medium without damaging the recording medium. The present invention provides a contact-sliding type magnetic head for magneto-optical recording, which enables easy and high reliability.

[0009]

[Means for Solving the Problems]

 A magnetic head 11 for magneto-optical recording according to the present invention has a sliding portion 15 that is in contact with the recording medium 1, and a head body 16 made up of a magnetic core 12 and a bobbin 14 around which a coil 13 is wound. The elastic support 17 is held by the support 17, and a wiring pattern 22 serving as a lead wire of the coil 13 is formed on one surface of the elastic support 17.

[0010]

[Action]

 According to the magneto-optical recording magnetic head 11 of the present invention, by having the sliding portion 15 that is in contact with the recording medium 1, the contact of the magnetic core 12 with the recording medium 1 is avoided, and the magnetic head 11 is used as the recording medium. It can be slid in contact with 1 without damaging it.

Further, by forming the wiring pattern 22 serving as the lead wire of the coil 13 on one surface of the elastic support 17 which holds the head body 16, connection of the coil terminal is facilitated and the lead from the coil 13 is formed. Wiring is simple and a highly reliable magnetic head can be obtained.

[0012]

【Example】

 An embodiment of a magnetic head for magneto-optical recording according to the present invention will be described below with reference to FIGS.

In FIGS. 1 to 3, reference numeral 1 denotes a magneto-optical disk, and 11 denotes a magneto-optical recording magnetic head according to the present embodiment which is in contact with and slid on the magneto-optical disk 1. The magneto-optical disk 1 is constructed by forming a magneto-optical recording layer 6 made of a perpendicular magnetization film on a base 5, and forming a protective film 7 made of an ultraviolet curable resin on the recording layer 6.

The magnetic head 11 has a magnetic core 12, a bobbin 14 mounted on the magnetic core 12 and wound with a coil 13, and a bobbin 14 integrally formed at the end of the bobbin 14 to contact the magneto-optical disc 1. A magnetic head main body 16 composed of a sliding portion 15 and an elastic support (so-called gimbal) 17 for supporting the magnetic head main body 16 are provided.

The magnetic core 12 is made of, for example, a ferrite core, and as shown in FIG. 4, has a center core portion 12B extending vertically in the center of the upper surface of a base core 12A having a rectangular shape in a plane. Formed.

The bobbin 14 has, for example, a winding core portion 19 at the center of the upper surface of a base portion 18 having a quadrangular shape in plan view, and a shape into which the base core portion 12 A of the magnetic core can be just inserted into the base portion 18. An insertion hole 20 having a size is formed, and a center hole 21 penetrating the inside of the winding core portion 19 from the insertion hole 20 is formed.

The sliding portion 15 is formed such that the sliding surface 15 a that contacts the disk 1 is a curved surface, which is a spherical surface in this example, and is arranged at the upper end of the winding core portion 19 of the bobbin 14. The radius of curvature of the sliding surface 15a is set to about R = 50 mm to 100 mm.

The elastic support body 17 for supporting the magnetic head body 16 is made of a resin material, and has a wiring pattern 22 which serves as a lead wire of the coil 13, that is, a pair of wires, on a surface 17 a opposite to the head body 16. Of the conductive layers 22A and 22B are formed along the longitudinal direction of the elastic support 17, and the one ends 22A ₁ and 22B ₁ of the conductive layers 22A and 22B are used as external lead terminals and the other ends 22A ₂ and 22B ₂ are formed. The terminal pins 23A and 23B to be connected are set up.

However, in this example, as shown in FIGS. 2 and 3, the elastic support body 17, the bobbin 14, and the sliding portion 15 are integrally formed by injection molding of resin including the terminal pins 23A and 23B. Then, it is formed as one component (integrally molded component) 24. In this case, the sliding portion 15 is made of a self-lubricating resin such as fluorine-based, polyacetal-based, or nylon-based resin that has good lubricity with respect to the protective film 7 of the ultraviolet curable resin of the disk 1, that is, does not scratch. For the bobbin 14, a resin having good moldability such as ABS resin is used, and for the elastic support 17, an engineering plastic material such as PPS (polyphenylene sulfide), PEEK (polyether ether ketone), LCP (liquid crystal polymer) is used. The so-called three-color molding used can be integrally molded. In addition, it is also possible to perform two-color molding or integrally molding with one kind of resin. For example, since the polyacetal resin has both self-lubricating property and moldability, the bobbin 14 and the sliding portion 15 can be integrally molded by using this polyacetal resin.

The conductive layers 22A and 22B on one surface of the elastic support 17 can be formed by printing, plating, or a general printed wiring forming technique after obtaining the integrally molded component 24. Also, the terminal pins 23A and 23B may be planted after the integrally molded component 24 is obtained.

The coil 13 is wound around the winding core portion 19 of the integrally molded component 24, and the coil end is connected to the terminal pins 23A and 23B that are erected on the elastic support 17 by being twisted, and the magnetic core 12 is connected to the bobbin. The contact-sliding type magnetic head 11 for magneto-optical recording according to the present embodiment is constructed by being mounted in the center hole 21 and the insertion hole 20 in the reference numeral 14.

According to the above-described embodiment, the disk 1 of the magnetic core 12 is provided by including the sliding portion 15 that is in contact with the disk 1 integrally with the bobbin 14 so as to cover the tip of the central core portion 12B of the magnetic core 12. The magnetic head 11 can be smoothly brought into contact with and slid with respect to the disk 1 without damaging the protective film 7 of the disk 1.

Further, since the sliding surface 15a of the sliding portion 15 that comes into contact with the disk 1 is rounded, soft contact can be made to the disk 1 and the Russell effect of dust (effect of scraping dust) Adhesion of dust to the sliding surface due to is avoided.

Then, the terminal pins 23A and 23B are planted on the elastic support 17, and the conductive layers 22A and 22B to be the lead wires are formed on the one surface 17a so as to be connected to the terminal pins 23A and 23B, respectively. Thus, the terminal treatment of the coil 13 and the lead lead out from the coil 13 to the outside can be performed easily and reliably.

Furthermore, since the elastic support 17, the bobbin 14, and the sliding portion 15 are formed as an integrally molded part 24 by resin injection molding, the number of parts constituting the magnetic head 11 is reduced, and the number of head assembly steps is reduced. Can be reduced and the accuracy of parts can be improved. Therefore, a compact and highly reliable contact-sliding type magnetic head 11 for magneto-optical recording can be obtained.

In the above example, the sliding portion 15 and the bobbin 14, and the elastic support 17 are integrally formed. However, in addition to the elastic support 17 having the terminal pins 23A and 23B and the conductive layers 22A and 22B, , 6 may be provided separately, the magnetic head main body 16 may be assembled, and then the magnetic head main body 16 may be mounted on the elastic support 17.

As the elastic support 17, in addition to the above example, although not shown, for example, a wiring pattern or conductive layers 22A and 22B to be a lead wire of a coil is formed on a metal spring member via an insulating layer. The elastic support made of can be used. In this case, even if heat is generated by the coil 13 in the magnetic head main body 16, there is an advantage that heat is radiated through the metal bar member that constitutes the elastic support body 17.

[0028]

[Effect of the device]

 According to the present invention, a highly reliable magnetic head for magneto-optical recording can be obtained without damaging the recording medium and simplifying the lead out from the coil to the outside. Therefore, it is suitable for application to, for example, a magnetic head for magneto-optical recording of an ultra-compact digital recording / reproducing apparatus using a magnetic field modulation overwrite method.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a magnetic head for magneto-optical recording according to the present invention.

FIG. 2 is a perspective view of the magnetic head for magneto-optical recording of FIG. 1 seen from the upper surface.

FIG. 3 is a perspective view of the magnetic head for magneto-optical recording of FIG. 1 seen from the back surface.

FIG. 4 is a perspective view of a magnetic core.

FIG. 5 is a configuration diagram of a magnetic field modulation type magneto-optical recording system.

FIG. 6 is a sectional view showing an example of a magneto-optical disk.

[Description of Reference Signs] 1 magneto-optical disk 2 laser light 3 magnetic head 5 base 6 magneto-optical recording layer 7 protective film 11 magnetic head for magneto-optical recording 12 magnetic core 13 coil 14 bobbin 15 sliding portion 16 magnetic head body 17 elastic support Body 22 Wiring pattern 22A, 22B Conductive layer 23A, 23B Terminal pin

Claims (1)

[Scope of utility model registration request] 1. A head body having a sliding portion that is in contact with a recording medium and having a bobbin having a coil wound around a magnetic core is held by an elastic support, and the coil is provided on one surface of the elastic support. A magnetic head for magneto-optical recording, which is formed with a wiring pattern to be a lead wire.