JP2004280874A - Magnetic head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress an increase in the thickness of a magnetic head and to increase a data writing speed. <P>SOLUTION: A magnetooptical head H comprises an objective lens 5a for forming a laser spot onto the surface of magnetooptical disk D; a coil 2 for generating a magnetic field for recording; first leading wiring sections 25a, 25b for allowing the coil to perform energization for a coil 2 and a second leading wiring section 25c; and a magnetic material film 3 for suppressing leakage in the magnetic field for recording. One portion of the second leading wiring section 25c is formed by the magnetic material film 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnetic head used for recording and reproducing data on a magnetic recording medium. The “magnetic head” in this specification means a data recording / reproducing head provided with a magnetic field generating coil, and is a concept including a magneto-optical head. Further, the “magnetic recording medium” in this specification means a recording medium on which data can be recorded and / or reproduced by using magnetic means. Therefore, this is a broad concept including not only a magnetic disk and a magneto-optical disk, but also a data recording medium using magnetic means having any shape.
[0002]
[Prior art]
Data recording on a magnetic recording medium is performed by controlling the direction of the magnetic flux of a recording magnetic field generated by a coil provided in a magnetic head. The direction of the magnetic flux of the recording magnetic field is sharply and continuously reversed by applying a high-frequency current to the coil. In a magnetic recording medium, it is preferable that a recording magnetic field is made to act as effectively as possible. For this purpose, there is a means for providing a magnetic head with a magnetic film having a high magnetic permeability (for example, see Patent Document 1). .).
[0003]
Conventionally, as an example of a magnetic head for recording and reproducing such data, there is, for example, a magnetic head having a configuration as shown in FIG. The magnetic head H ′ includes a slider 80, an objective lens 81 mounted on the slider 80, a coil 82, and a magnetic film 83. The coil 82 is for generating a recording magnetic field, is formed of two spiral conductor films 82a and 82b, and is covered with a dielectric layer 86 from the viewpoint of insulation protection. The inner peripheral ends of the two conductor films 82a and 82b are electrically connected to each other via a connection portion 84. Leading wiring portions 85a and 85b extending in the radial direction of the coil 82 are connected to the outer peripheral ends of the conductor films 82a and 82b, respectively. By connecting the wiring members 86a and 86b to these, the outside of the coil 82 is connected. Power supply from The magnetic film 83 is made of a material having a high magnetic permeability, and is disposed below the coil 82. According to such a configuration, the recording magnetic field generated by the coil 82 is prevented from leaking below the magnetic film 83, and the magnetic field can be effectively applied to the magneto-optical disk D. it can.
[0004]
[Patent Document 1]
JP, 2003-511144, A
[Problems to be solved by the invention]
However, the conventional means has the following disadvantages.
[0006]
When data is written to the magneto-optical disk D by a magnetic field modulation method, the direction of the magnetic flux of the magnetic field is switched by flowing a high-frequency current through the coil 82. As shown in FIG. 12, the power supply device 88 including a pair of output terminals 88a and 88b for supplying power to the coil 82 needs to have a function of rapidly and continuously switching the direction of the high-frequency current. . For this reason, the power supply device 88 becomes complicated, which may cause an increase in cost and a reduction in the reliability of the device. In addition, in response to a request for a higher-speed write process, switching of the current by the power supply device 88 may not have a sufficient reversal speed in some cases.
[0007]
As a means for solving such a problem, it is conceivable to employ a coil having a structure shown in FIG. The coil 91 shown in the figure is composed of two conductor films 91a and 91b. One ends of these conductor films 91a and 91b are connected to a terminal 93, and the terminal 93 is connected to a negative terminal of a power supply device (not shown). The other ends 94 and 95 of the conductor films 91a and 91b are respectively connected to the positive terminal of the power supply device. When the end 94 is energized, an upward magnetic field is generated at the center of the conductor film 91a. On the other hand, when the end portion 95 is energized, a downward magnetic field is generated at the center of the coil 91b. By using the coil having such a structure, it is possible to reverse the direction of the magnetic field generated by the coil without changing the direction of the current supplied from the power supply device. In other words, the power supply device does not need to have a function of generating a high-frequency current, but can perform high-speed reversal with the current direction kept constant. Further, the configuration of the power supply device can be simplified.
[0008]
However, in the coil 91 having the structure shown in FIG. 13, the magnetic head H ′ according to the related art has two lead-out wiring portions 85a and 85b, but has three lead-out wiring portions. Many. Therefore, if the magnetic head of the structure shown in FIG. 13 is used as it is, a space for providing an increased lead wiring portion is required, and the thickness of the magnetic head is correspondingly increased. When the thickness of the dielectric layer 86 increases with this, the stress due to its formation increases, and this stress acts on the slider 80. Since the slider 80 is formed of, for example, glass, there is a possibility that the above-mentioned stress may cause a problem that the slider 80 is warped or broken. The magnetic head H ′ according to the prior art has little margin in the strength of the slider 80 against the stress caused by the formation of the dielectric layer 86, and it is difficult to increase the thickness of the dielectric layer 86.
[0009]
The present invention has been conceived in view of the above circumstances, and has as its object to enable high-speed data writing while suppressing an increase in the thickness of a magnetic head.
[0010]
DISCLOSURE OF THE INVENTION
In order to solve the above problems, the present invention employs the following technical means.
[0011]
The magneto-optical head provided by the present invention includes a magnetic field generating coil arranged to face a magnetic recording medium, a plurality of lead-out wiring portions for energizing the coil, and the magnetic field sandwiching the coil. A magnetic head comprising: a recording medium and a magnetic film provided on the opposite side, at least one of the plurality of lead-out wiring portions, a part of which is formed by the magnetic film, or It is characterized in that it is configured to pass through a notch formed in the magnetic film.
[0012]
According to the above configuration, at least one of the plurality of lead wiring portions connected to the coil has a structure provided by utilizing a space for providing the magnetic film, thereby increasing the thickness of the entire magnetic head. Can be suppressed. Therefore, for example, even in the case where the number of lead-out wiring portions is increased for the purpose of increasing the reversal speed of the coil, the increase in the thickness of the magnetic head is suppressed, and the magnetic head is warped or cracked. It is possible to suppress such troubles as getting rid of.
[0013]
In a preferred embodiment of the present invention, the coil has a configuration in which two spiral conductive films having different winding directions are stacked, and inner ends of the two conductive films are connected to each other. As the plurality of lead wiring portions, a pair of first lead wiring portions having one end connected to each outer peripheral end of the two conductor films, and one end connected to each inner peripheral end of the two conductive films. And a second lead-out wiring portion.
[0014]
According to the above configuration, for example, the pair of first lead-out wiring portions are connected to the positive terminal of the power supply device, the second lead-out wiring portion is connected to the negative terminal of the power supply device, and the power supply device is provided. By applying a current to one of the pair of first extraction wiring portions using the switching function provided, the direction of the recording magnetic field can be reversed, and writing can be performed by the magnetic field modulation method. Therefore, since it is not necessary to use a power supply device that can generate a high-frequency current, the power supply device can have a simple configuration as compared with the related art. Further, according to the above-mentioned switching, the speed of data writing can be increased.
[0015]
In a preferred embodiment of the present invention, a part of the second lead-out wiring portion is formed of the magnetic film, or passes through a notch formed in the magnetic film. At the same time, each of the first lead-out wiring portions is formed in the same layer as the two conductor films. According to such a configuration, it is preferable in that the thickness of the magnetic head is reduced.
[0016]
In a preferred embodiment of the present invention, one of the two conductor films of the coil located farther from the magnetic recording medium has a larger number of turns than the other.
[0017]
According to the above configuration, even if the conductor films have different distances from the magnetic recording medium on which data is written, when the same voltage is applied, the magnetic fields generated by the same in the recording layer of the magnetic recording medium are applied. It is possible to make the strengths equal. Therefore, the power supply device does not need to be able to adjust the voltage, and can have a simple structure. In addition, it is possible to prevent a decrease in the reliability of the writing process.
[0018]
Other features and advantages of the present invention will become more apparent from the detailed description given below with reference to the accompanying drawings.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
[0020]
1 to 3 show one embodiment of a magnetic head according to the present invention.
[0021]
First, an example of a configuration of a magnetic information processing apparatus using a magnetic head according to the present invention will be described with reference to FIG. The magnetic information processing device P shown in FIG. 1 is configured as a magneto-optical disk device including a magnetic head H, a carriage 6, a fixed optical unit 7, and a power supply device 8.
[0022]
The magneto-optical disk D is supported by a spindle Sp, and can rotate at high speed around the spindle Sp by the driving force of the spindle motor M. The recording layer 40 is provided on the surface of the opposing surface of the magneto-optical disk D that faces the magnetic head H. The surface of the recording layer 40 is covered with a light-transmitting insulating protective film 41.
[0023]
The carriage 6 is disposed below the magneto-optical disk D, and is movable in the radial direction of the magneto-optical disk D by, for example, a driving force of a voice coil motor (not shown). By the movement of the carriage 6, a seek operation for positioning the magneto-optical head H near the target track is performed. The fixed optical unit 7 includes a laser diode, a collimator lens, and the like (both are not shown). The laser light L emitted from the fixed optical unit 7 travels toward the carriage 6 and is mounted on the carriage 6. It is configured to reach the rising mirror 13. The fixed optical unit 7 is also provided with a beam splitter and a photodetector (both not shown).
[0024]
The actuator 9 is for performing focus control and tracking control during recording and reproduction on the magneto-optical disk D. The actuator 9 is mounted on the carriage 6, and is capable of moving the lens holder 10 on which the objective lens 5b is mounted in the vertical direction and the radial direction of the magneto-optical disk D.
[0025]
2, the magnetic head H is configured as a magneto-optical head including a slider 1, an objective lens 5a mounted on the slider 1, a coil 2, and a magnetic film 3. ing. The slider 1 is supported by a suspension 12 that can be bent and deformed in the vertical direction, and is arranged to face the magneto-optical disk D. The slider 1 floats with a small gap between the slider 1 and the magneto-optical disk D by a so-called wedge effect caused by an air flow flowing between the slider 1 and the magneto-optical disk D. is there. The slider 1 is made of, for example, glass of the same material as the objective lens 5a, and has a light-transmitting dielectric layer 4 formed on the surface thereof.
[0026]
The objective lens 5a is for converging the laser light L transmitted through the objective lens 5b to form a laser spot on a recording target portion of the recording layer 40 of the magneto-optical disk D.
[0027]
The coil 2 is buried in the vicinity of the surface of the dielectric layer 4 and includes a first conductor film 20a and a second conductor film 20b. The first and second conductor films 20a and 20b are both spiral coils, and have different winding directions. The first and second conductor films 20a and 20b are formed so as not to block the laser beam L transmitted through the objective lens 5a, and have the optical axis A of the objective lens 5a as its center.
[0028]
A connection portion 24 made of a conductor is provided between the first and second conductor films 20a and 20b. The inner peripheral end 21a of the first conductor film 20a and the inner peripheral end 21b of the second conductor film 20b are electrically connected to each other via the connection portion 24. A pair of first lead-out wiring portions 25a and 25b extending in the radial direction of the coil 2 are connected to the outer peripheral ends 22a and 22b of the first and second conductor films 20a and 20b, respectively. A second lead-out wiring part 25c is connected to the inner peripheral end 21b of the second conductor film 20b. The second extracted wiring portion 25c is a part is formed by a magnetic film 3, and the wiring portion 25c ₁ which connects the end portion 21b and the magnetic film 3, is connected to the magnetic film 3 It is configured by including a wiring portion 25c ₂ extending in the radial direction of the magneto-optical disk D. These first and second lead-out wiring portions 25a to 25c are portions for making the first and second conductor films 20a and 20b conduct electricity, and extend to the outside of the dielectric layer 4. One end of each of them is exposed to the outside on one side surface of the dielectric layer 4 or one side surface of the slider 1. Wiring members 26a to 26c made of a metal film such as copper that are electrically connected to the first and second lead-out wiring portions 25a to 25c are connected to the exposed portions, and the coil members are connected via these wiring members 26a to 26c. 2 from the power supply device 8 can be supplied.
[0029]
The magnetic film 3 is disposed below the coil 2 so as to prevent the recording magnetic field generated by the coil 2 from leaking downward and to allow the magnetic field to act on the magneto-optical disk D efficiently. It is. The magnetic film 3 is formed of a material having a high magnetic permeability such as permalloy, and has a ring shape with the optical axis A as its center so as not to block the laser beam L.
[0030]
The first and second conductor films 20a and 20b, the first and second lead-out wiring portions 25a to 25c, the magnetic film 3, and the like constituting the coil 2 can be manufactured by a process similar to the semiconductor manufacturing process. It is possible. The first and second conductor films 20a and 20b and the first and second lead-out wiring portions 25a to 25c are formed by patterning a metal film such as copper into a predetermined shape. A thin layer of a dielectric is formed so as to cover the two conductor films 20a and 20b. Similarly, the magnetic film 3 is formed by patterning a film such as permalloy, and a thin dielectric layer is formed so as to cover the magnetic film 3. By repeating such a process, the dielectric layer 4 having a laminated structure is formed on the surface of the slider 1, and the first and second conductor films 20a and 20b, the first and second lead-outs are formed inside the dielectric layer 4. A structure in which the wiring portions 25a to 25c, the magnetic film 3, and the like are embedded is obtained.
[0031]
3, the power supply device 8 is for supplying power to the coil 2, and includes a pair of positive terminals 8a and 8b and a negative terminal 8c. The pair of first lead-out wiring portions 25a, 25b are connected to a pair of positive terminals 8a, 8b via wiring members 26a, 26b, and the second lead-out wiring portion 25c is connected to the negative terminal 8c. Connected to. The power supply device 8 has a switching function, and can be switched to one of the positive terminals 8a and 8b to supply electricity. When power is supplied from the terminal 8a by the switching, as shown in FIG. 3A, power is supplied to the first conductor film 20a via the first lead-out wiring portion 25a and the second lead-out wiring portion 25c. A supply circuit is formed. At this time, the first conductor film 20a formed as a spiral coil generates a recording magnetic field 40 in a downward direction at the center thereof. On the other hand, when electricity is supplied from the terminal 8b by the switching, as shown in FIG. 3B, the second conductor film 20b is connected to the second conductor film 20b via the first lead-out wiring part 25b and the second lead-out wiring part 25c. A circuit for supplying power is formed. Since the winding directions of the first and second conductor films are opposite to each other, the direction of the recording magnetic field 40 generated by the second magnetic film is opposite to the direction of the magnetic field by the first magnetic film. And upward.
[0032]
Next, the operation of the magnetic head H will be described.
[0033]
When writing data to the magneto-optical disk D by the magnetic field modulation method, first, the magneto-optical disk D is rotated so that the slider 1 flies at a small interval from the magneto-optical disk D. Then, by continuously irradiating the recording target portion of the recording layer 40 with the laser beam L, the temperature of the recording layer 40 is increased. On the other hand, the direction of the recording magnetic field generated by the coil 2 is switched according to the content of the recording data. Thereby, the direction of the magnetization of the magnetic material constituting the recording layer 40 is controlled. At this time, the switching of the direction of the recording magnetic field by the coil 2 is performed by the switching function provided in the power supply device 8, and the current from the power supply device 8 is applied to either the first conductor film 20 a or the second body film 20 b. The current is appropriately supplied to the power supply. Therefore, it is possible to write data by the magnetic field modulation method using a power supply device having a simple structure, and it is possible to suppress an increase in cost and a decrease in reliability of the device. Further, as compared with the power supply device having a function of generating a high-frequency current used in the prior art, the current inversion by switching provided in the power supply device 8 can be speeded up, and the data writing speed can be increased. Can be achieved.
[0034]
Further, the second lead-out wiring portion 25c provided to enable the use of the power supply device 8 exhibiting the above-described effects is partially formed using the magnetic film 3. Therefore, no new space is required to provide the second lead-out wiring part 25c, and for example, the dielectric layer 4 is not made thick to provide the second lead-out wiring part 25c. Therefore, the thickness of the magnetic head H can be made equal to that of the magnetic head according to the related art, and it is possible to prevent the magnetic head H from being warped or broken.
[0035]
4 to 10 show another embodiment of the magnetic head according to the present invention. In these drawings, the same or similar elements as those in the above embodiment are denoted by the same reference numerals as those in the above embodiment.
[0036]
In the embodiment shown in FIGS. 4 to 7, the second lead-out wiring portion 25 c is configured to pass through a cutout portion formed in the magnetic film 3.
[0037]
More specifically, in the configuration shown in FIG. 4, the second lead-out wiring portion 25c connected to the inner peripheral end 21b of the conductor film 20b is not connected to the magnetic film 3 but is And extends to the outside of the dielectric layer 4. As shown in FIG. 5, the magnetic film 3 is partially cut to form a notch 3a, through which the second lead-out wiring portion 25c passes. are doing. According to such a configuration, the current supplied to the coil 2 does not flow through the magnetic film 3. Therefore, in addition to the above-described effects, an effect of preventing an overcurrent loss in the magnetic film 3 can be obtained. Even when the magnetic film 3 is formed of a material having a high resistivity, energy loss due to heat generation or the like can be obtained. And power supply to the coil 2 can be efficiently performed.
[0038]
In the configuration shown in FIGS. 6 and 7, the magnetic film 3 has a structure in which a cutout 3b having a depth of about half the thickness is formed. The second lead-out wiring section 25c passes through the cutout 3b. With such a configuration, the same effect as described above can be obtained.
[0039]
In the embodiment shown in FIG. 8, the number of turns of the second conductor film 20b farther from the magneto-optical disk D is larger than the number of turns of the first conductor film 20a closer to the magneto-optical disk D. I have. In data writing, either the first conductor film 20a or the second conductor film 20b is used alone depending on the direction of the recording magnetic field to be generated. Unlike the present embodiment, when the number of turns of each of the first and second conductor films 20a and 20b is the same, it is assumed that the voltages applied to the first and second conductor films 20a and 20b are the same. Due to the difference in the distance to the layer 40, the intensity of the recording magnetic field by the first and second conductor films 20a and 20b in the recording layer 40 differs. Such a difference in the strength of the recording magnetic field may cause an error in data writing. On the other hand, according to the present embodiment, the number of turns of the second conductor film 20b arranged at a position far from the magneto-optical disk D is larger than that of the first conductor film 20a. When the same voltage is applied to the recording layer 40, the intensity of the recording magnetic field in the recording layer 40 can be made equal. Therefore, it is possible to prevent a decrease in the reliability of the writing process. Further, the configuration of the power supply device can be further simplified.
[0040]
The present invention is not limited to the contents of the above-described embodiment.
[0041]
In the embodiment shown in FIG. 9, the coil 2 is formed by one conductor film 20a. The second lead-out wiring portion 25c connected to the inner peripheral end 21a of the conductor film 20a is formed using a part of the magnetic film 3. In this configuration, as shown in FIG. 10, similarly to the related art, the control of the recording magnetic field is performed by supplying a high-frequency current to the coil 2 and has a function of generating a high-frequency current. A power supply 8 'is used. As described above, the present invention can be applied not only to a so-called two-layer structure but also to a single-layer structure. In this case, in the related art, the second lead-out wiring part 25c and the magnetic material film 3 need to be provided at different heights, whereas in the present embodiment, the second lead-out wiring part 25c and the magnetic material film 3 are provided. 3 can be provided at the same height, so that the thickness of the magnetic head H can be reduced.
[0042]
【The invention's effect】
As understood from the above description, according to the present invention, it is possible to increase the speed of data writing while suppressing an increase in the thickness of the magnetic head.
[Brief description of the drawings]
FIG. 1 is a schematic explanatory view showing an example of a magnetic information processing apparatus using a magnetic head according to the present invention.
FIG. 2 is a cross-sectional view of a main part showing one embodiment of a magnetic head according to the present invention.
FIG. 3 is an explanatory diagram of generation of a magnetic field by a coil and a power supply device.
FIG. 4 is a sectional view of a main part showing another embodiment of the magnetic head according to the present invention.
FIG. 5 is a cross-sectional view of a main part along line VV in FIG. 4;
FIG. 6 is a sectional view of a main part showing another embodiment of the magnetic head according to the present invention.
7 is a cross-sectional view of a main part along line VII-VII in FIG. 6;
FIG. 8 is a sectional view of a main part showing another embodiment of the magnetic head according to the present invention.
FIG. 9 is a sectional view of a main part showing another embodiment of the magnetic head according to the present invention.
FIG. 10 is an explanatory diagram of generation of a magnetic field by a coil and a power supply device.
FIG. 11 is an explanatory diagram of a conventional technique.
FIG. 12 is a diagram illustrating generation of a magnetic field by a coil and a power supply device.
FIG. 13 is an explanatory diagram of a structure of a magnetic generation coil.
[Explanation of symbols]
H Magnetic head 1 Slider 2 Coil 3 Magnetic film 3a, 3b Notch 4 Dielectric layer 5a, 5b Objective lens 8 Power supply device 20a First conductor film 21b Second conductor film 25a, 25b First lead-out wiring section 25c second lead-out wiring section

Claims (4)

A magnetic field generating coil disposed to face the magnetic recording medium;
A plurality of lead-out wiring portions for energizing the coil,
A magnetic film provided on the opposite side of the magnetic recording medium with respect to the coil,
A magnetic head comprising:
At least one of the plurality of lead-out wiring portions is configured such that a part thereof is formed of the magnetic film or passes through a cutout formed in the magnetic film. , Magnetic head. The coil has a configuration in which two spiral conductive films having different winding directions are stacked, and inner peripheral ends of the two conductive films are connected to each other,
As the plurality of lead-out wiring portions, a pair of first lead-out wiring portions having one end connected to each outer peripheral end of the two conductor films, and one end connected to each inner peripheral end of the two conductive films. The magnetic head according to claim 1, further comprising: a second lead-out wiring portion. A part of the second lead-out wiring portion is formed of the magnetic film, or has a configuration in which the cut-out portion is formed in the magnetic film, and each of the first lead-out wiring portions 3. The magnetic head according to claim 2, wherein the magnetic head is formed in the same layer as the two conductor films. 4. The magnetic head according to claim 2, wherein one of the two conductor films of the coil located farther from the magnetic recording medium has a larger number of turns than the other. 5.

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