JP3158327B2 - Magnetic head device for magneto-optical recording - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device for magneto-optical recording applied to magneto-optical recording in which a magnetic core is mounted on a resin holder having a sliding portion for a magneto-optical recording medium together with a coil bobbin.

[0002]

2. Description of the Related Art A contact-slidable magnetic head that slides while being in contact with a disk-shaped recording medium is composed of a magnetic head element including a coil body, a magnetic core, and a sliding body. And an arm spring for holding and stably contacting the disk-shaped recording medium.

As shown in FIG. 6, a magnetic body 20a having a coil 20d wound around a coil bobbin 20c and a magnetic core 20b are sequentially inserted in the direction of arrow A in FIG. And a head body 20 having a slider portion in an outer housing for accommodating them.
A is integrated as A. As a method of fixing the above-mentioned parts inside the sliding body at the time of this integration, for example, as shown in FIG.
While the magnetic core 20b is heated by the chip 21 heated by the heater from the side, the magnetic core 20b is pressed to thermally deform the outer casing inner wall 20D of the sliding body and press-fitted, and a fixing method using an adhesive or the like is generally practical. Has been

[0004]

The amount of thermal deformation is, as shown in FIG.
Surfaces and the tapered portions 20f and 20g at both ends of the magnetic core 20b.
20 formed on the inner wall 20D due to thermal deformation of
The depth d of h, 20i is very small, for example, 10 to 20 μm. For this reason, the head body 20A is
It is not possible to obtain the strength for fixing the magnetic core 20b in the head body 20A integrated with the magnetic head 20A. For this reason, the press-fitting strength may be weakened due to a temporal change after the press-fitting. In particular, when power is supplied to the magnetic head element composed of the head section 20B after the press-fitting, heat is generated by the power supply inside the magnetic head element, and the resin of the outer frame of the magnetic head element is heated. By this heating, the magnetic head element
Loose or missing magnetic coils. Due to such a defect, the magnetic head element causes the magnetic field generated from the magnetic core when recording on the magneto-optical disk to not reach the recording magnetic layer of the magneto-optical disk, or the magnetic field is not generated. It will have fatal drawbacks.

[0005] In addition, for the heat press-fitting for fixing, temperature control at the time of press-fitting and high-temperature work of, for example, 300 ° C or more depending on the material of a sliding body using so-called nylon, polyphenylene sulfide (PPS), liquid crystal polymer or the like. Become. For this reason, the work environment requires high-temperature countermeasures in accordance with the high-temperature work.

Next, when the bonding method is used for fixing the magnetic coil, the fixing strength of the magnetic coil 20b in the outer frame of the head body 20A can be maintained, but the adhesive is applied to the small magnetic coil 20b. In this case, it takes a long time for the adhesive to protrude and to solidify the adhesive, so that it is necessary to go through a plurality of laborious processes such as managing the curing of the adhesive. In this way, in the bonding method, workability deteriorates,
This leads to a decrease in production efficiency in production and an increase in production cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and uses a simple method to fix a magnetic core disposed in a magnetic head element, thereby making high-temperature countermeasures equipment unnecessary. It is an object of the present invention to provide a magnetic head device for magneto-optical recording that can significantly reduce manufacturing costs.

[0008]

In order to solve the above-mentioned problems, a magnetic head device for magneto-optical recording according to the present invention has a magnetic core mounted on a resin holder having a sliding portion for a magneto-optical recording medium together with a coil bobbin. The resin holder has an abutting surface against a magnetic core to be inserted, and a locking piece that locks a back side of the magnetic core,
The magnetic core is held by the abutting surfaces and the locking pieces.

[0009]

In the magnetic head device for magneto-optical recording according to the present invention, an abutting surface for the magnetic core inserted into the resin holder and a locking piece for locking the back side of the magnetic core are provided. By holding the magnetic core with a surface and a locking piece, equipment for condition management and condition management is unnecessary with a one-touch set by press-fitting method, and the magnetic core is sufficiently fixed in the resin holder. The strength to keep can be obtained.

[0010]

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

In a recording / reproducing device to which a magnetic head device for magneto-optical recording is applied, for example, as shown in FIG. 1, a rotatable flat disk-shaped recording medium is housed in a disk cartridge 10. The disk cartridge 10 includes
A shutter member is provided on both sides 10a and 10b of the disk cartridge 10 to expose the disk-shaped recording medium when the disk-shaped recording medium is inserted into the apparatus. The disc cartridge 10 of FIG. 1 schematically shows a state where the shutter member is opened. At this time, the disk-shaped recording medium in the apparatus is rotated at a predetermined rotational speed by an arrow R in FIG.
Has been rotated in the direction.

There are various types of recording media in this disk-shaped recording medium. The disk-shaped recording medium shown in FIG. 1 is a so-called rewritable magneto-optical disk (hereinafter referred to as a magneto-optical disk) capable of writing a light beam and an information signal supplied from a magnetic head and reading the information signal using the light beam. ) 11.

The magneto-optical disk 11 has a recording magnetic film as a recording magnetic layer formed on a transparent disk substrate. The recording magnetic film is a magnetic thin film that facilitates magnetization in a direction perpendicular to the disk substrate and uses a material having a large magneto-optical effect, for example, a magnetic Kerr effect or a Faraday effect. On the magneto-optical disk 11, a reflective film made of, for example, an Al thin film is laminated on the recording magnetic layer, and a protective film made of an ultraviolet curable resin or the like for protecting these thin films from corrosion is formed on the reflective film. It is formed and formed.

When recording an information signal on the magneto-optical disk 11, the recording / reproducing apparatus uses a disk cartridge 10
A laser beam as a light beam is irradiated from the optical pickup 12 facing the magneto-optical disk surface in a non-contact manner from the side 10b. By this laser light irradiation, the magneto-optical disk 11
Raises the temperature of the recording magnetic film partially beyond the Curie point or the temperature compensation point. By this temperature increase, the magnetization of the recording magnetic film at the irradiation position of the laser beam is eliminated. Thereafter, a new information signal to be recorded is externally applied to the position where the magnetization has disappeared. The optical pickup 12 and the magneto-optical disk 1 are used to apply an information signal from outside.
A magnetic head device 13 for magneto-optical recording as a magnetic field generating device is slidably disposed at a position P opposed to the magnetic head device 1 via the magnetic field generating device 1. The magnetic head device 13 for magneto-optical recording changes the direction of the recording magnetic field according to the information signal applied from the outside, that is, the direction of the magnetization.

When reproducing an information signal from the magneto-optical disk 11, the magneto-optical disk 11 is irradiated with a laser beam via the optical pickup 12. The recorded information is reproduced according to the magneto-optical effect in which the irradiated laser light is reflected on the surface of the magneto-optical disk 11.

As described above, the magnetic head device 1 for magneto-optical recording
The slider 3 slides on the surface of the magneto-optical disk 11 only at least during a recording operation. However, depending on the system, the slide may always be performed during reproduction.

The magnetic head device 13 for magneto-optical recording comprises:
A magnetic head element 13a formed by winding a coil around a magnetic core and the magnetic head element 13a are prevented from coming into contact with and separating from the magneto-optical disk 11 too much. 13b for applying an urging force for pressing in the direction, and the magnetic head element 13a supported by the support member 13b.
And a sliding portion 13c for contacting and sliding with the rotating magneto-optical disk 11 without directly contacting the magneto-optical disk 11. Here, the magnetic head element 13a and the sliding portion 13c are generally integrated with an outer frame 13d in which a magnetic core is housed using, for example, resin in order to reduce the number of parts and reduce manufacturing costs. It is made by molding.

Further, a magnetic head device 13 for magneto-optical recording
Explaining the connection relationship with each part of FIG. 2, as shown in FIG.
An arm member (not shown) for rotating the magnetic head element 13a to a desired position includes a head arm 1 to be connected.
30 are fastened together through three through-holes 130a, 130b, 130c. By this connection, the magnetic head device 13 for magneto-optical recording can be moved to a desired position on the magneto-optical disk according to, for example, rotation by a voice coil motor. The head arm 130 is notched in an “L” shape in order to dispose the support member 131. The member 13 on the side of the magnetic head element 13a in the head arm 130
Reference numeral 0d denotes a thin elongated member which is screwed and fixed with a screw hole cut in a flat portion of the sliding portion 13c with a screw 130e. An information signal indicating the direction of magnetization is supplied to the head arm 130 from the outside of the magnetic head device 13 for magneto-optical recording to the contacts 130f and 130g. The contact 13
0f and 130g are provided on the flexible substrate 132. The flexible substrate 132 has contacts 130f, 130
The signal line extending from g is supplied to the magnetic head element 13a. The flexible substrate 132 is provided on the supporting member 1.
The substrate is shaped so as to be placed on the substrate 31.

The support member 131 has a suspension 131a having an urging force for pressing in the direction of the surface of the magneto-optical disk, and is connected to the suspension 131a toward the surface of the magneto-optical disk to a position where the magnetic head element 13a is arranged. And a supporting portion 131b that is gently inclined. The suspension 131a is provided with a through-hole 13 provided in a metal fitting 131c sandwiching the suspension 131a.
It is connected to the head arm 130 via 1d and 131e. Further, both ends of the support portion 131b are bent in an “L-shape” in order to secure the strength of this member. Support part 1
The inclined surface 131f of 31b is provided with a perforated opening 131g,
The magnetic head element 13a is provided in the bore 131g.

The support portion 131b is formed with the elongated holes 131g, so that the elongated support portions 131h and 131h are formed.
i can. The elongated support portions 131h and 131i are formed so that the vertical portion 131k is bent substantially vertically on the flat portion of the sliding portion 13c. In this bent part, a perforation 131
A hole 131j is formed at a position where g is extended.
After the head arm 130 is screwed, the head arm 1
30d is penetrated into the perforated opening 131j obliquely upward. The head arm 130 d is
j is freely fitted within j. Here, in order to prevent the head arm 131d from coming off the perforated opening 131j, the locking piece 130 is set in a direction substantially orthogonal to the vertical portion 131k.
h, 130i.

Thus, a magnetic head device for magneto-optical recording is constituted.

In order to integrate the magnetic head element 13a and the sliding portion 13c in the magnetic head device 13 for magneto-optical recording, a resin material is formed by injection molding. The injection molding for integration will be described later.

When the magnetic head is viewed from the sliding surface direction, the sliding surface 13d of the sliding portion 13c has, for example, a small sliding friction, as shown in FIG. The magnetic head element 13a has a cylindrical surface shape having a longitudinal direction along the sliding direction, and is disposed on the leading side in the sliding direction. As a plastic base material constituting the outer housing 13A of the head body, polyacetal (PA) and polyphenylene sulfide (PPS) are used.
And the curvature of the cylindrical sliding surface is R-10.
It is manufactured by injection molding.

An externally molded head main body housing 13A
Is mainly made of a thermoplastic resin. As the material, a so-called plastic including the thermoplastic resin and the photocurable resin is used. Further, as fillers contained in these materials, for example, glass fibers, carbon fibers, whisker particles such as potassium titanate,
Carbon particles, chromium oxide, alumina, glass beads,
There are talc, silicon carbide, silicon nitride and the like. When resin is molded including the above-mentioned filler,
The sliding portion 13c having good slidability can be formed.

Next, the magnetic head element 2 used in the magnetic head device for magneto-optical recording according to the present invention will be described with reference to FIGS. FIG. 2 is also referred to as needed. Here, the magnetic head element 2 of FIG.
The broken state shown by the one-dot chain line AA is shown.

The magnetic head element 13a is manufactured by press-fitting a member to be fixed into the head body outer casing 13A of the magnetic head element 13a in order to fix the magnetic core 133 to be built into the head body outer casing 13A. are doing. As shown in FIG. 4, the magnetic head element 13a has a resin outer frame 13A, a ferrite magnetic core 133 made of, for example, Mn-Zn or Ni-Zn, and a urethane copper wire (φ0.08 mm). ) Is formed of a coil bobbin 134 made of a thermoplastic resin having excellent heat resistance and wound around the coil 135, and a head portion 13B inserted through the magnetic core 133. The magnetic core 133 has tapered portions 133a and 133b formed on both sides of the magnetic core 133.

The magnetic head element 13a shown in FIG.
The cross section in a state where the head portion 13B is inserted into the head main body outer housing 13A cut at -A is shown. Head part 13B
Is inserted from the direction of arrow B in FIG. 4 into the inside of a head body outer casing 13A formed by, for example, injection molding. The head portion 13B is in a state where the head portion 13B is abutted on the inner bottom surface side of the outer housing 13A of the head body and does not fall downward from this position.

In order to form this abutting state, the head body outer casing 13A is molded by injecting a high pressure into the mold cavity from the direction of arrow B in FIG. 4 and solidifying it. The outer housing 13A of the head main body has a tapered portion 133 of the magnetic core 133.
a, 133b on the rear surface 133c side and the head body outer housing 13A
Locking pieces 139 on side walls 136 and 137 facing each other
140 are formed. In order to form the locking pieces 139 and 140 on the side walls 136 and 137, respectively, the slit 1
38a, 138b, 138c, and 138d are provided so that the locking pieces 139 and 140 have a spring property. These locking pieces 139 and 140 are provided with through-holes 141 and 142 through which dies for forming the tapered portions 139a and 140a to be locked at the time of injection molding, respectively.
For this reason, ± in the width direction of the magnetic core 133 (the direction of arrow C).
Variations of 0.1 mm can be absorbed.

The outer housing 13A of the head body is
In order to improve the positional accuracy between the magnetic core 133 and the magnetic core 133, for example, 0.05
A guide groove 143 in consideration of a clearance of about mm is provided on both sides of a fitting opening 144 for fitting with the protrusion 133d at the center of the magnetic coil. Furthermore, the through-hole 141,
Projection 14 for forming an abutment surface near 142
5, 146 are provided.

With this configuration, when the head portion 13B is pressed into the outer housing 13A of the head body in the direction of arrow B in FIG. 4, the head portion 13B is moved out of the head body as is apparent from the sectional view of FIG. Locking pieces 139 and 140 for locking the magnetic coil 133 with the abutting surfaces formed by the protrusions 145 and 146 formed on the bottom surface side inside the housing 13B are formed, and the locking pieces 139 and 140 are used to form the tapered portion 133 of the magnetic coil 133.
The magnetic coil 133 is locked in the head body outer housing 13A by one-touch by pressing down from the back surface 133c side of a and 133b.

With the above-described configuration, in the conventional magnetic head element using the press-fitting method, the stress of the resin is suppressed from being relaxed as compared with the case of fixing the magnetic head element in the outer frame. The fixing strength can be kept high and a strong impact can be endured. For example, the reliability can be maintained even if it changes with time in high temperature storage. Also,
By using the press-fitting method as compared with the bonding method, the manufacturing process can be simplified and the working efficiency can be improved.

[0032]

In the magnetic head device for magneto-optical recording according to the present invention, the abutting surface for the magnetic core inserted into the resin holder and the locking piece for locking the back side of the magnetic core are provided. The magnetic core is held by the abutment surface and the locking piece, and the one-touch setting by press-fitting method eliminates the need for equipment for condition management and condition management, and sufficiently secures the magnetic core in the resin holder. It is possible to obtain the strength to keep it, and it is possible to significantly reduce man-hours and sufficiently reduce the manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a block diagram of a recording / reproducing apparatus to which a magneto-optical recording magnetic head device according to the present invention is applied when a magneto-optical recording magnetic head device is arranged on a magneto-optical disk for recording. It is a schematic diagram explaining a positional relationship.

FIG. 2 is an external perspective view of the magnetic head device for magneto-optical recording as viewed from obliquely above. FIG. 3 is a cross-sectional view of the magnetic head element of the magnetic head device for magneto-optical recording before the magnetic coil is fixedly arranged, taken along a breaking line AA.

FIG. 3 is an external perspective view of a sliding portion when the magnetic head is viewed from a sliding surface direction.

FIG. 4 is an exploded perspective view for explaining a configuration of the magnetic head element.

FIG. 5 is a cross-sectional view of the magnetic head element cut along a breaking line AA when a magnetic coil is fixedly disposed on the magnetic head element by press-fitting.

FIG. 6 is an exploded perspective view for explaining a configuration of the conventional magnetic head element.

FIG. 7 is a cross-sectional view showing a state in which a chip is brought into contact with a conventional magnetic head element and heat-inserted.

[Explanation of symbols]

 10 Disk cartridge 11 Magneto-optical disk 12 Optical pickup 13 Magneto-optical recording Magnetic head device 13a Magnetic head element 13b Support member 13c Sliding part 13d ..Outer frame 130 ... Head arm 131 ... Support member 132 ... Flexible board 133 ... Magnetic coils 133a, 133b: Tapered portions of magnetic coils 138a to 138d: Slits 139, 140 ... Locking pieces 139a, 139b: Tapered portions of locking pieces 141, 142 ... · Through-hole 144 · · · · · · fitting port 145, 146 .... projections 13A ········· head body outside 筺 13B ········· head portion

Claims (1)

(57) [Claims] A magnetic core is mounted on a resin holder having a sliding portion for a magneto-optical recording medium together with a coil bobbin. The resin holder has an abutting surface against a magnetic core to be inserted and a back surface of the magnetic core. A magnetic head device for magneto-optical recording, comprising: a locking piece for locking the side, wherein the abutting surface and the locking piece hold the magnetic core.