WO2012176498A1 - Procédé d'ajustement de la position d'un élément optique - Google Patents

Procédé d'ajustement de la position d'un élément optique Download PDF

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Publication number
WO2012176498A1
WO2012176498A1 PCT/JP2012/054707 JP2012054707W WO2012176498A1 WO 2012176498 A1 WO2012176498 A1 WO 2012176498A1 JP 2012054707 W JP2012054707 W JP 2012054707W WO 2012176498 A1 WO2012176498 A1 WO 2012176498A1
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WO
WIPO (PCT)
Prior art keywords
optical element
light source
light
optical
slider
Prior art date
Application number
PCT/JP2012/054707
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English (en)
Japanese (ja)
Inventor
田中　秀樹
Original Assignee
コニカミノルタアドバンストレイヤー株式会社
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Publication of WO2012176498A1 publication Critical patent/WO2012176498A1/fr

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • G11B5/3109—Details
    • G11B5/313—Disposition of layers
    • G11B5/3133—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure
    • G11B5/314—Disposition of layers including layers not usually being a part of the electromagnetic transducer structure and providing additional features, e.g. for improving heat radiation, reduction of power dissipation, adaptations for measurement or indication of gap depth or other properties of the structure where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/60—Fluid-dynamic spacing of heads from record-carriers
    • G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
    • G11B5/6088—Optical waveguide in or on flying head
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B2005/0002—Special dispositions or recording techniques
    • G11B2005/0005—Arrangements, methods or circuits
    • G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal

Definitions

  • This invention relates to a method for adjusting the position of an optical element.
  • HDD Hard Disk Drive
  • the interval between magnetic bits becomes narrow, and the polarity becomes unstable due to a superparamagnetic effect or the like. For this reason, a recording medium having a high coercive force is required.
  • a magnetic field required for recording also increases.
  • the upper limit of the magnetic field generated by the recording head is determined by the saturation magnetic flux density, but the value approaches the material limit, and there is a situation that a dramatic increase cannot be expected.
  • the magnetic bit is heated locally to cause magnetic softening, recording is performed with a reduced coercive force, and then the heating is stopped and natural cooling is performed to stabilize the recorded magnetic bit.
  • a recording method that guarantees the performance has been proposed. This method is called a “thermally assisted magnetic recording method”.
  • the recording medium is instantaneously heated. Further, the heating mechanism and the recording medium rotating at high speed are not allowed to contact. Therefore, heating is generally performed by irradiating a recording medium with a minute spot of laser light. This method using light for heating is called an “optically assisted magnetic recording method”.
  • laser light is incident on an optical waveguide formed on a slider and irradiated to a plasmon probe formed on the output end of the optical waveguide, thereby generating near-field light.
  • high coupling efficiency is required when the laser light is incident on the optical waveguide.
  • Coupling efficiency refers to the rate at which light from the emission end of the light source is coupled to the incident end of the optical waveguide.
  • the magnetic recording head of Patent Document 1 is configured to directly couple the light from the laser diode 40 to the light incident surface 354 of the waveguide 35. In order to obtain high coupling efficiency with such a configuration, it is necessary to bring the light emitting end of the laser diode 40 close to the light incident surface 354.
  • the magnetic recording head of Patent Document 2 has a configuration in which the output light 7 d of the optical fiber 9 is condensed on the incident end 5 a of the optical waveguide 5 by the condensing surface 8 a of the aspherical mirror 8. By condensing two-dimensionally using the aspherical mirror 8, high coupling efficiency can be obtained.
  • Patent Document 3 discloses a configuration in which the positions of the semiconductor laser element 3 and the optical waveguide 4 are adjusted using the alignment mark member M1. Thus, by adjusting the position of the semiconductor laser element 3 and the optical waveguide 4 when the magnetic recording head is assembled, a magnetic recording head with high coupling efficiency can be manufactured.
  • the laser diode 40 is disposed vertically (that is, the light emitting end of the laser diode 40 is disposed so as to face the light incident surface 354).
  • the light emitting end of the laser diode 40 can be brought close to the light incident surface 354.
  • the resonator length of the laser since the size of the magnetic recording head is limited, when the laser diode 40 is disposed vertically, the resonator length of the laser must be short. However, if the resonator length is shortened, it becomes difficult to obtain a laser output necessary for magnetic recording.
  • the light from the light source is incident between the members (for example, the optical waveguide 5, the aspherical mirror 8, and the light in Patent Document 2) in order to enter the incident end of the optical waveguide with high coupling efficiency.
  • a strict positional relationship is required for the fiber 9).
  • the magnetic recording head of Patent Document 2 is configured to two-dimensionally collect the output light 7d of the optical fiber 9, the positional relationship among the optical waveguide 5, the aspherical mirror 8, and the optical fiber 9 is small. When collapsed, the coupling efficiency is greatly reduced.
  • An object of the present invention is to provide an optical element position adjustment method capable of improving coupling efficiency by simple adjustment while considering the size limitation of a magnetic recording head.
  • a method for adjusting the position of an optical element according to claim 1 includes: a light source that outputs light in a direction substantially perpendicular to the optical waveguide on a slider having the optical waveguide; and irradiation of light from the light source. It is used for position adjustment in a magnetic recording head having an optical element that has a curvature only in a predetermined direction in the region and is formed with a reflection surface that reflects light from the light source.
  • the optical element position adjustment method includes a positioning step and a fixing step.
  • the optical element position adjusting method includes: a light source that outputs light in a direction substantially orthogonal to the optical waveguide on the slider having the optical waveguide; And is used for position adjustment in a magnetic recording head having an optical element having a curvature only in a predetermined direction in the irradiation region and having a reflection surface for reflecting light from a light source.
  • the optical element position adjustment method includes a positioning step and a fixing step.
  • the positioning step the optical element is moved in one direction with respect to the slider, and the optical element is positioned with respect to the slider so that light from the light source is coupled to the incident end of the optical waveguide by the reflecting surface.
  • the fixing step the optical element is fixed to the slider in the positioned state.
  • the optical element position adjusting method according to claim 3 is the optical element position adjusting method according to claim 1, wherein one direction is a direction along the optical waveguide. Or any one of the directions orthogonal to the optical waveguide.
  • the optical element position adjusting method according to claim 4 is the optical element position adjusting method according to claim 1 or 2, wherein the curvature in a predetermined direction is constant. Further, the invention described in claim 4 can be applied to the invention described in claim 3.
  • the optical element position adjusting method according to claim 5 is the optical element position adjusting method according to claim 1 or 2, wherein the reflecting surface is formed on the surface of the optical element. Has been. Further, the invention described in claim 5 can be applied to the invention described in claim 3 or 4.
  • an optical element position adjustment method according to claim 6 is the optical element position adjustment method according to claim 1 or 2, wherein the light from the light source is in a far field. The shape is elliptical, and the major axis direction of the elliptical shape and the predetermined direction are substantially matched. The invention described in claim 6 can be applied to the invention described in any one of claims 3 to 5.
  • the height of the magnetic recording head can be suppressed by arranging the light source so as to irradiate light in a direction substantially orthogonal to the optical waveguide. Further, since the optical element can be positioned with respect to the light source only by moving the optical element in only one direction with respect to the light source, the coupling efficiency can be improved by simple adjustment.
  • the height of the magnetic recording head can be suppressed by arranging the light source so as to irradiate light in a direction substantially orthogonal to the optical waveguide. Furthermore, since the optical element can be positioned with respect to the slider only by moving the optical element in only one direction with respect to the slider, the coupling efficiency can be improved by simple adjustment.
  • FIG. 6 is a flowchart showing an assembly procedure of the optically assisted magnetic recording head according to the embodiment. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG. It is a figure which supplements description of the flowchart of FIG.
  • FIG. 10 is a flowchart showing an assembling procedure of an optically assisted magnetic recording head according to Modification 1. It is a figure which supplements description of the flowchart of FIG. 10 is a side view showing an optically assisted magnetic recording head according to Modification 2.
  • FIG. FIG. 10 is a top view showing an optically assisted magnetic recording head according to Modification 2.
  • 6 is a table showing conditions of Example 1, Example 2, Comparative Example 1 and Comparative Example 2.
  • 3 is a graph showing the results of Example 1.
  • 3 is a graph showing the results of Example 1.
  • 6 is a sectional view showing an optically assisted magnetic recording head according to Comparative Example 1.
  • FIG. 6 is a graph showing the results of Comparative Example 1.
  • 6 is a graph showing the results of Comparative Example 1.
  • 10 is a graph showing the results of Example 2.
  • 10 is a graph showing the results of Example 2.
  • 10 is a graph showing the results of Example 2.
  • 10 is a perspective view showing an optical element according to Comparative Example 2.
  • FIG. 6 is a top view showing an optically assisted magnetic recording head according to Comparative Example 2.
  • FIG. 10 is a graph showing the results of Comparative Example 2.
  • 10 is a graph showing the results of Comparative Example 2.
  • 10 is a graph showing the results of Comparative Example 2.
  • 10 is a table showing conditions of Example 3 and Example 4.
  • 10 is a graph showing the results of Example 3.
  • 10 is a graph showing the results of Example 3. It is a graph which shows the result of Example 4. It is a graph which shows the result of Example 4.
  • an optically assisted magnetic recording device for example, a hard disk device, hereinafter sometimes referred to as “information recording device 1” equipped with an optically assisted magnetic recording head is capable of rotating a plurality of recording sheets, for example.
  • the disk 3 may be one.
  • the head support portion 5 is provided to be rotatable in the direction of arrow A (tracking direction) with the support shaft 6 as a fulcrum.
  • the tracking actuator 7 is attached to the head support portion 5.
  • the optical head 4 is attached to the tip of the head support 5.
  • a drive device (not shown) rotates the disk 3 in the direction of arrow B.
  • the information recording apparatus 1 is configured such that the optical head 4 can move relatively while flying over the disk 3.
  • FIG. 2 is a sectional view of the optical head 4.
  • FIG. 3 is a perspective view of the optical element 30.
  • FIG. 4 is an enlarged view of the optical head 4 as viewed from above.
  • the optical head 4 is a minute optical recording head that uses light for information recording on the disk 3.
  • the optical head 4 includes a slider 10, a light source unit 20, and an optical element 30.
  • the information recording apparatus 1 is configured such that the disk 3 is moved in the direction of arrow C, and the optical head 4 can move relatively while flying over the disk 3.
  • the rotation direction (arrow C direction) of the disk 3 is described as the y direction
  • the thickness direction of the optical head 4 is described as the z direction
  • the direction orthogonal to both the y direction and the z direction is described as the x direction.
  • the slider 10 is a square substrate formed of a material such as AlTiC, for example.
  • the slider 10 has a lower surface 10a that faces the disk 3, an upper surface 10b that is located on the opposite side of the lower surface 10a in the z direction, and a side surface 10c.
  • a magnetic head portion 13 is formed on the slider 10.
  • the magnetic head unit 13 includes an optical waveguide 14, a magnetic recording unit (not shown), a magnetic information reproducing unit (not shown), and an electrode (not shown).
  • the magnetic head portion 13 is formed integrally with the slider 10, but a separate member may be attached to the side surface 10 c of the slider 10.
  • the optical waveguide 14 guides light from the light source unit 20 guided by the optical element 30 and forms a path for emitting the light toward the disk 3.
  • the optical waveguide 14 has an incident end 14a and an exit end 14b. Light from the light source unit 20 is incident on the incident end 14a.
  • the incident end 14 a is provided on the upper surface of the magnetic head unit 13 that is substantially flush with the upper surface 10 b of the slider 10. Light that has passed through the optical waveguide 14 is emitted from the emission end 14b.
  • the emission end 14 b is provided on the lower surface of the magnetic head portion 13 that is substantially flush with the lower surface 10 a of the slider 10.
  • the optical waveguide 14 is formed by laminating a lower clad layer, a core layer, and an upper clad layer (all not shown) in this order along the thickness direction perpendicular to the direction in which light propagates.
  • the core layer, each clad layer (eg, SiO 2 in form) having a refractive index higher than that of the material (e.g., Ta 2 O 5) is formed by. Thereby, the light guided to the optical waveguide 14 propagates toward the disk 3 while being totally reflected between the core layer and each cladding layer.
  • a plasmon probe 15 as a near-field light generating element is disposed.
  • the light from the light source unit 20 guided by the optical element 30 enters the optical waveguide 14 from the incident end 14a and travels in the optical waveguide 14 toward the output end 14b.
  • the plasmon probe 15 provided at the emission end 14 b converts the light guided by the optical element 30 into near-field light and emits it toward the disk 3.
  • a magnetic recording unit (not shown) writes magnetic information to the recording portion of the disk 3.
  • a magnetic information reproducing unit (not shown) reads magnetic information recorded on the disk 3.
  • An electrode (not shown) is formed on the upper surface 10 b of the slider 10. The electrodes have a predetermined pattern shape and are connected to the light source unit 20 to supply driving power to the light source unit 20.
  • the slider 10 moves relative to the disk 3 that is a magnetic recording medium while flying, but there is a possibility of contact with the disk 3 if there is a dust attached to the disk 3 or a defect in the disk 3.
  • a hard material having high friction resistance as the material of the slider 10.
  • a ceramic material containing Al 2 O 3 , AlTiC, zirconia, TiN, or the like may be used.
  • the surface of the slider 10 on the disk 3 side may be subjected to a surface treatment for increasing the friction resistance.
  • high hardness can be obtained by using a DLC (Diamond Like Carbon) coating.
  • the light source unit 20 includes, for example, a semiconductor laser (Laser Diode: LD).
  • the light source unit 20 outputs light in a direction substantially orthogonal to the optical waveguide 14.
  • the “substantially orthogonal direction” refers to a direction in which light from the light source unit 20 can enter a reflecting surface 31 (described later) of the optical element 30.
  • the wavelength of light output from the semiconductor laser is from visible light to near infrared wavelength (wavelength band is about 0.6 ⁇ m to 2 ⁇ m. Specific wavelengths are 650 nm, 780 nm, 830 nm, and 1310 nm. , 1550 nm, and the like.
  • any one of materials such as GaAs, AlGaAs, InGaAs, AlGaInP, InAlGaN, InGaN, GaN, GaInNA, GANASP, and AlGaNAs may be used. Then, a semiconductor laser can be manufactured by stacking layers necessary for light emission on the wafer.
  • the light source unit 20 is disposed on the upper surface 10 b of the slider 10.
  • the light source unit 20 has an emission surface 20a and a bottom surface 20b.
  • an emission end 20c for emitting light from the semiconductor laser to the outside of the light source unit 20 is formed.
  • the light source unit 20 outputs light from the emission end 20 c toward the optical element 30.
  • the optical element 30 is an element for reflecting and condensing light from the light source unit 20 and guiding it to the incident surface 14 a of the optical waveguide 14.
  • the optical element 30 is made of, for example, a rectangular member, and a reflection surface 31 is formed on a part thereof.
  • the reflecting surface 31 itself is very small, the size of the optical element 30 itself can be made relatively large by being formed into a rectangular member. Therefore, the optical element 30 can be easily manufactured. Moreover, the handling property of the optical element 30 can be secured, and the assembly of the optical head 4 is facilitated.
  • the optical element 30 is made of, for example, an optically transparent resin or glass.
  • the optical element 30 is produced by, for example, injection molding, a glass mold method, or an imprint method.
  • the resin for injection molding include thermoplastic resins such as polycarbonate (for example, AD5503, Teijin Chemicals Ltd.) and ZEONEX 480R (Nippon Zeon Co., Ltd., “ZEONEX” is a registered trademark).
  • An example of the resin for imprinting is PAK-02 (Toyo Gosei Co., Ltd.), which is a photocurable resin.
  • the reflecting surface 31 is exposed to the outside. Therefore, the reflecting surface 31 functions as a surface reflecting mirror.
  • the reflection surface 31 can be formed of a metal film such as gold or aluminum, a reflection film of a dielectric multilayer film, or the like. Since the reflecting surface 31 is a surface reflecting mirror, the light from the light source unit 20 does not enter the optical element 30. Therefore, it is possible to reduce the light amount loss due to the light passing through the optical element 30. It is also possible to use the optical element 30 having the reflecting surface 31 inside.
  • the reflection surface 31 is formed in a cylindrical surface shape (a part of the cylindrical surface).
  • the reflection surface 31 has a curvature only in a predetermined direction in an area (irradiation area) irradiated with light from the light source unit 20.
  • the irradiated light is collected in the direction (predetermined direction) having the curvature of the reflecting surface 31.
  • the irradiated light is diverged in directions other than the predetermined direction (direction having no curvature). It is desirable that the curvature of the reflecting surface 31 is constant in a predetermined direction. By making the curvature constant, light can be collected uniformly.
  • the reflecting surface 31 has a curvature only in the y direction. Therefore, as shown in FIG. 4, the light reflected by the reflecting surface 31 is incident on the incident surface 14a of the optical waveguide 14 in a state of spreading only in the x direction (the light P is incident on the incident surface 14a). Corresponds to the spot).
  • the shape of the reflecting surface 31 is not limited to a circle (cylindrical), but may be a cylindrical surface formed of a part of an aspherical cross section such as an ellipse.
  • the optical element 30 has a light source side bonding surface 30a and a magnetic head unit side bonding surface 30b.
  • the light source side bonding surface 30a is bonded to the emission surface 20a of the light source unit 20 via an adhesive or the like.
  • the magnetic head unit side bonding surface 30b is bonded to the upper surface of the magnetic head unit 13 (the upper surface 10b of the slider 10) via an adhesive or the like.
  • the optical element 30 is bonded to the optical head 4, it is only necessary that at least one of the light source side bonding surface 30a and the magnetic head unit side bonding surface 30b is bonded by an adhesive or the like.
  • the areas of the light source side bonding surface 30a and the magnetic head unit side bonding surface 30b may be the same or different (FIG. 3 and the like show examples having different areas).
  • FIG. 5 is a flowchart showing an assembling procedure of the optical head 4.
  • 7 and 9 are enlarged views of the optical head 4 as viewed from above (from the ⁇ z direction). 7 and 9, the optical element 30 is not shown.
  • 6, 8, and 10 are cross-sectional views of the optical head 4.
  • the light source unit 20 is placed on the upper surface 10b of the slider 10 (S10).
  • the center C of the incident surface 14a is positioned on the extension line O of the output end 20c as shown in FIG. It is desirable to arrange the light source unit 20 and align the side surface 10c of the slider 10 and the emission surface 20a of the light source unit 20 in parallel.
  • the light source unit 20 is fixed to the slider 10 (S11).
  • the light source unit 20 is fixed by, for example, soldering.
  • a solder paste is applied in advance to the electrodes formed on the upper surface 10b of the slider 10.
  • the light source unit 20 is fixed to the slider 10 by infrared rays, hot air reflow, or the like.
  • the optical element 30 is placed on the upper surface 10b of the slider 10 (S12).
  • the adhesive 40 is applied to the light source side bonding surface 30a of the optical element 30 in advance, and is brought into contact with the light emission surface 20a of the light source unit 20 to perform temporary fixing.
  • the adhesive 40 it is desirable to use, for example, an adhesive having ultraviolet curing characteristics or thermosetting characteristics. Even if the adhesive 40 is not used, the optical element 30 is abutted against the emission surface 20a of the light source unit 20 in a state where the optical element 30 is held by a holding device such as an air tweezers, thereby obtaining the same effect as the temporary fixing. It is also possible.
  • the optical element 30 is positioned with respect to the light source unit 20 by moving the optical element 30 in one direction (the direction of arrow D in FIG. 10) with respect to the light source unit 20 in the state temporarily fixed in S12 (S13). Positioning process). The positioning is performed, for example, so that the light from the light source unit 20 is coupled to the incident end 14a of the optical waveguide 14 by the reflecting surface 31 of the optical element 30 (so-called active alignment method).
  • the positioning process in S13 will be specifically described. As shown in FIG. 9, in the state where positioning is not performed, the light (spot P) from the light source unit 20 is likely to be shifted from the incident end 14a of the optical waveguide 14 in the y direction. Therefore, the light (spot P) from the light source unit 20 can be moved in the y direction by moving the optical element 30 in the arrow D direction (z direction) in FIG. In this manner, the light (spot P) from the light source unit 20 can be coupled to the incident end 14a of the optical waveguide 14 by finely adjusting the position of the spot P (see FIG. 4).
  • the optical element 30 when the optical element 30 is moved in the direction of arrow D in FIG. 10, it is desirable to move the light source side joining surface 30 a of the optical element 30 along the emission surface 20 a of the light source unit 20.
  • the light source unit 20 on which the emission surface 20 a is formed is fixed to the slider 10. Therefore, since the emission surface 20a functions as a guide for moving the optical element 30, positioning can be performed accurately.
  • the optical element 30 can be positioned with respect to the light source unit 20 by moving the optical element 30 in the y direction.
  • the light (spot P) from the light source unit 20 and the optical waveguide 14 can be positioned by moving the optical element 30 in the y direction or the z direction. That is, “one direction” in the present embodiment refers to the y direction or the z direction. Note that “one direction” can be restated as either the direction along the optical waveguide 14 (incident end 14a) or the direction orthogonal to the optical waveguide 14 (incident end 14a).
  • the major axis direction of the ellipse may be positioned so that the predetermined direction of the reflecting surface 31 substantially matches. desirable.
  • the major axis direction of the elliptical shape coincide with a predetermined direction (direction having a curvature) of the reflecting surface 31, light in a direction in which the light is further spread (the major axis direction of the elliptical shape) can be condensed on the reflecting surface 31. it can. Accordingly, loss of light can be reduced.
  • the optical element 30 is fixed with respect to the light source part 20 in the state positioned by S13 (S14. Fixing process). For example, in the case where the adhesive 40 having ultraviolet curing properties is temporarily fixed, the optical element 30 is bonded and fixed to the light source unit 20 by irradiating ultraviolet rays while maintaining the state positioned in S13. Thus, the optical head 4 in which the position of the optical element 30 is adjusted can be manufactured (see FIG. 2). In addition, when the optical element 30 is bonded and fixed to the light source unit 20, it is also possible to fix the optical element 30 (magnetic head side bonding surface 30b) to the slider 10 (upper surface 10a).
  • the optical element position adjustment method includes a light source unit 20 that irradiates light in a direction substantially orthogonal to the optical waveguide 14 on the slider 10 having the optical waveguide 14, and an irradiation region of light from the light source unit 20. Is performed on a magnetic recording head (optical head 4) having an optical element 30 having a curvature only in a predetermined direction and on which a reflection surface 31 for reflecting light from the light source unit 20 is formed.
  • the position adjustment method includes a positioning step and a fixing step.
  • the optical element 30 is moved in one direction (either in the direction along the optical waveguide 14 or in the direction perpendicular to the optical waveguide 14) with respect to the light source unit 20, and the light from the light source unit 20 is reflected by the reflection surface 31.
  • the optical element 30 is positioned with respect to the light source unit 20 so as to be coupled to the incident end 14 a of the optical waveguide 14.
  • the optical element 30 is fixed to the light source unit 20 in a positioned state.
  • the height of the magnetic recording head can be suppressed by arranging the light source unit 20 so as to irradiate light in a direction substantially orthogonal to the optical waveguide 14.
  • the resonator length can be kept sufficiently long. That is, it is possible to secure an output necessary for optical assist while taking into consideration the size limitation of the magnetic recording head.
  • the optical element 30 can be positioned with respect to the light source unit 20 only by moving the optical element 30 in only one direction with respect to the light source unit 20, the coupling efficiency can be improved by simple adjustment.
  • the curvature of the reflecting surface 31 in a predetermined direction is formed constant.
  • the curvature of the reflecting surface 31 in a predetermined direction constant, it is possible to uniformly collect light in that direction. Therefore, when the optical element 30 is moved in only one direction with respect to the light source unit 20 for positioning, the coupling efficiency can be improved with a simple adjustment.
  • FIG. 11 is a flowchart showing an assembling procedure of the optical head 4 in this modification.
  • FIG. 12 is a cross-sectional view of the optical head 4.
  • the light source unit 20 is placed on the upper surface 10b of the slider 10 (S20), and the light source unit 20 is fixed to the slider 10 by soldering (S21).
  • the optical element 30 is placed on the upper surface 10b of the slider 10 (S22).
  • an adhesive is applied in advance to the magnetic head portion side joint surface 30b of the optical element 30 and is brought into contact with the upper surface 10b of the slider 10 to perform temporary fixing.
  • the optical element 30 is positioned with respect to the slider 10 by moving the optical element 30 in one direction (the direction of arrow E in FIG. 12) with respect to the slider 10 in the state temporarily fixed in S22 (S23. Positioning). Process).
  • the magnetic head side bonding surface 30 b of the optical element 30 can be moved along the upper surface 10 b of the slider 10. In this case, since the upper surface 10b functions as a guide for moving the optical element 30, positioning can be performed accurately.
  • the optical element 30 is fixed to the slider 10 (S24, fixing step). Even with such a method, the optical head 4 in which the position of the optical element 30 is adjusted can be manufactured (see FIG. 2).
  • the optical element position adjustment method includes a light source unit 20 that irradiates light in a direction substantially orthogonal to the optical waveguide 14 on the slider 10 having the optical waveguide 14, and an irradiation region of light from the light source unit 20. Is performed on a magnetic recording head (optical head 4) having an optical element 30 having a curvature only in a predetermined direction and on which a reflection surface 31 for reflecting light from the light source unit 20 is formed.
  • the position adjustment method includes a positioning step and a fixing step.
  • the optical element 30 is moved in one direction (either in the direction along the optical waveguide 14 or in the direction perpendicular to the optical waveguide 14) with respect to the slider 10, and the light from the light source unit 20 is guided by the reflecting surface 31.
  • the optical element 30 is positioned with respect to the slider 10 so as to be coupled to the incident end 14 a of the waveguide 14.
  • the optical element 30 is fixed to the slider 10 in a positioned state.
  • the height of the magnetic recording head can be suppressed by arranging the light source unit 20 so as to irradiate light in a direction substantially orthogonal to the optical waveguide 14.
  • the resonator length can be kept sufficiently long. That is, it is possible to secure an output necessary for optical assist while taking into consideration the size limitation of the magnetic recording head.
  • the positioning can be performed by moving the optical element 30 in only one direction with respect to the slider 10, the coupling efficiency can be improved by simple adjustment.
  • Modification 2 Next, Modification 2 will be described with reference to FIGS. 13 and 14.
  • the example which fixes the optical element 30 with respect to the light source part 20 (slider 10) was described.
  • the adhesive 40 is applied in the fixing step without applying the adhesive 40 in advance will be described.
  • FIG. 13 is a side view of the optical head 4.
  • FIG. 14 is a top view of the optical head 4.
  • an inkjet head 60 that ejects minute ink droplets by an inkjet method is used.
  • the inkjet head 60 discharges the adhesive 40 instead of the ink to connect the side surface 20d of the light source unit 20 and the light source unit side joint surface 30a of the optical element 30 with the adhesive 40 (see FIG. 14; see FIG. 14). (The description of the inkjet head 60 is omitted).
  • the adhesive 61 having a particle size of several tens of ⁇ m can be accurately blown by several millimeters, which is suitable for application to a minute object.
  • the light source 20 and the optical element 3 are fixed by irradiating ultraviolet rays using an ultraviolet irradiation device (not shown) to cure the adhesive 40.
  • Example 1 Specific examples (Example 1 to Example 4) and comparative examples (Comparative Example 1 and Comparative Example 2) of the above-described embodiment will be described with reference to FIGS. 15 to 25B.
  • FIG. 15 is a list showing the conditions of the optical heads of Example 1, Example 2, Comparative Example 1 and Comparative Example 2.
  • FIG. 17 is a cross-sectional view of the optical head 4 ′ of Comparative Example 1.
  • FIG. 20 is a perspective view of the optical element 30 ′′ of Comparative Example 2.
  • FIG. 21 is a top view of the optical head 4 ′′ of Comparative Example 2.
  • FIGS. 16A, 16B, 18A, 18B, 19A to 19C, and 22A to 22C are graphs showing simulation results of Examples or Comparative Examples.
  • the vertical axis of each graph indicates the coupling efficiency (Coupling Efficiency. Unit:%).
  • 16A, 18A, 19A, and 22A indicate the amount of movement (shift amount) in the x direction (x shift, unit: mm).
  • the horizontal axes of FIGS. 16B, 18B, 19B, and 22B indicate the amount of movement (shift amount) in the y direction (y shift, unit: mm).
  • the horizontal axes of FIGS. 19C and 22C indicate the shift amount (movement amount) in the z direction (z shift, unit: mm).
  • Example 1 In Example 1, the optical head 4 (see FIG. 2) prepared by the method described in the above embodiment was used. As shown in FIG. 15, the wavelength of the used light is 830 nm, the mode field diameter in the x direction of the optical waveguide 14 (hereinafter sometimes referred to as “MFDx”) is 4 ⁇ m, and the mode field diameter in the y direction of the optical waveguide 14 (hereinafter referred to as “MFDx”). , Which may be referred to as “MFDy”) is 2 ⁇ m, the distance L from the emission surface 20a of the light source unit 20 to the incident end 14a of the optical waveguide 14 is 37 ⁇ m, and the curvature radius in the x direction of the reflection surface 31 (hereinafter referred to as “rx”).
  • MFDx the mode field diameter in the x direction of the optical waveguide 14
  • rx the mode field diameter in the y direction of the optical waveguide 14
  • the curvature radius in the y direction of the reflecting surface 31 (hereinafter sometimes referred to as “ry”) was 25 ⁇ m.
  • the distance L in the present embodiment is a value obtained by adding the distance from the emission surface 20 a of the light source unit 20 to the reflection surface 31 of the optical element 30 and the distance from the reflection surface 31 to the incident end 14 a of the optical waveguide 14. is there.
  • FIG. 16A and FIG. 16B show simulation results when the optical waveguide 14 is moved in either the x direction or the y direction while the optical element 30 is fixed in the optical head 4 as described above.
  • FIG. 16A when the optical waveguide 14 is moved in the x direction, the result is obtained that the coupling efficiency does not change greatly. This is presumably because the light in the x direction is diverged by the reflecting surface 31 of the optical element 30 and thus has little influence on the movement of the optical waveguide 14.
  • FIG. 16B when the optical waveguide 14 is moved in the y direction, the coupling efficiency is greatly reduced as the shift amount in the y direction increases. From the above, it was found that in the configuration of Example 1 (optical head 4), the shift amount in the y direction should be reduced in order to increase the coupling efficiency.
  • Comparative Example 1 On the other hand, in Comparative Example 1 with respect to Example 1, an optical head 4 ′ as shown in FIG. 17 was used.
  • the optical head 4 ′ directly receives light from the light source unit 20 ′ (light from the output end 20 c ′ formed on the output surface 20 a ′) directly to the input end 14 a ′ of the optical waveguide 14 ′ provided on the slider 10 ′. It is the structure which makes it enter.
  • the wavelength of light used, MFDx, MFDy, and distance L in Comparative Example 1 are the same values as in Example 1.
  • the optical head 4 ′ in this comparative example does not have the optical element 30. Therefore, the distance L in this comparative example is the distance from the emission surface 20a of the light source unit 20 to the incident end 14a of the optical waveguide 14. Further, since the optical element 30 is not provided, it is assumed that both rx and ry are infinite.
  • the simulation results when the optical waveguide 14 ′ is moved in either the x direction or the y direction while the optical element 30 is fixed are graphs shown in FIGS. 18A and 18B.
  • the result is that the coupling efficiency is very low in the configuration of the optical head 4 ′.
  • the optical head 4 can ensure a high coupling efficiency as a whole as compared with the configuration of Comparative Example 1 (optical head 4 ′).
  • Example 2 Next, in the optical head 4, a change in coupling efficiency when the optical element 30 was moved in any of the xyz directions was determined.
  • the configuration of the optical head 4 is the same as that of the first embodiment.
  • Comparative Example 2 In Comparative Example 2 with respect to Example 2, an optical head 4 ′′ having an optical element 30 ′′ as shown in FIG. 20 was used.
  • the optical element 30 ′′ has a reflecting surface 31 ′′ having curvatures in the x direction and the y direction, respectively.
  • the light reflected and collected by the reflecting surface 31 ′′ is irradiated as the light of the spot P ′′ collected in the x direction and the y direction with respect to the incident end 14a ′′ of the optical waveguide 14 ′′. (See FIG. 21).
  • the optical head 4 ′′ includes the slider 10 ′′, the light source unit 20 ′′, and the like as in the optical head 4 (see FIG. 21).
  • the wavelength of light used, MFDx, MFDy, distance L, and ry are the same values as in Example 2.
  • rx of the optical element 30 ′′ (reflection surface 31 ′′) is 12.5 ⁇ m.
  • Example 3 In Example 3, the effect of positioning by moving the optical element 30 in the z direction is verified.
  • the optical head 4 produced by the method described in the above embodiment was used.
  • FIG. 23 shows a part in which an error may occur (“error part” in FIG. 23), the content of the error (“error item” in FIG. 23), and a tolerance when an error occurs (see FIG. 23).
  • the error occurrence probability is assumed to be constant within the tolerance range.
  • “ ⁇ tilt” in FIG. 23 refers to rotation around the x-axis.
  • “ ⁇ tilt” refers to rotation around the y-axis.
  • ⁇ tilt refers to rotation about the z-axis.
  • the ⁇ tilt of the light source unit 20 is + 0.2 °” means that the light source unit 20 is rotated (tilted) by + 0.2 ° around the x axis.
  • the shift width (movement width) of the optical element 30 is set to ⁇ 2 ⁇ m, and the stop accuracy of the shift (movement) is set to 0.2 ⁇ m. That is, the optical element 30 was moved in increments of 0.2 ⁇ m within a range from ⁇ 2 ⁇ m to +2 ⁇ m. Further, the coupling efficiency in the reference state (ideal state based on the design value) was set to 54.8%, and a simulation was performed using 100 samples of the optical head 4.
  • FIG. 24A is a histogram of the sample before positioning
  • FIG. 24B is a histogram of the sample after positioning.
  • the vertical axis represents the number of samples (Number of samples. Unit: pieces), and the horizontal axis represents the coupling efficiency (Coupling Efficiency, units:%).
  • process capability is the capability which can produce a good product within the defined standard value, and it is desirable that it is 1.33 or more.
  • Example 4 is the result of verifying the effect when positioning is performed by moving the optical element 30 in the y direction.
  • the optical head 4 produced by the method described in the above embodiment was used.
  • the error part, error item, tolerance, shift width (movement width) of the optical element 30, stop accuracy of shift (movement), coupling efficiency in the reference state, and number of samples are the same as in the third embodiment.
  • FIG. 25A is a histogram of the sample before positioning
  • FIG. 25B is a histogram of the sample after positioning. Similar to Example 3, the vertical axis represents the number of samples, and the horizontal axis represents the coupling efficiency.
  • SYMBOLS 1 Information recording device 2 Housing 3 Disc 4 Optical assist magnetic recording head (optical head) DESCRIPTION OF SYMBOLS 5 Head support part 6 Support shaft 7 Tracking actuator 10 Slider 10a Lower surface 10b Upper surface 10c Upper surface 10c Side surface 13 Magnetic head part 14 Optical waveguide 14a Incidence end 14b Emission end 15 Plasmon probe 20 Light source part 20a Emission surface 20b Bottom surface 20c Emission end 30 Optical element 30a Light source side bonding surface 30b Magnetic head side bonding surface 31 Reflecting surface 40 Adhesive

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Head (AREA)
  • Magnetic Heads (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)

Abstract

L'invention concerne un procédé permettant d'ajuster la position d'un élément optique, rendant possible l'amélioration de l'efficacité de connexion au moyen d'ajustements simples, en considérant la minimisation de la taille d'une tête d'enregistrement magnétique. Le procédé permettant d'ajuster la position de l'élément optique est utilisé pour ajuster la position d'une tête d'enregistrement magnétique ayant : une source de lumière permettant d'émettre de la lumière dans une direction sensiblement orthogonale à un guide d'ondes optique, sur une glissière comportant le guide d'ondes optique ; et un élément optique n'ayant une courbure que dans une direction prédéterminée dans une zone où la lumière rayonne de la source de lumière, une surface réfléchissante permettant de réfléchir la lumière de la source de lumière étant formée dans l'élément optique. Le procédé permettant d'ajuster la position de l'élément optique a une étape de positionnement et une étape de fixation. Dans l'étape de positionnement, l'élément optique est déplacé dans une direction par rapport à la source de lumière, et l'élément optique est positionné par rapport à la source de lumière de sorte que la lumière de la source de lumière est concentrée sur une extrémité d'incidence du guide d'ondes optique par la surface réfléchissante. Dans l'étape de fixation, la source de lumière et l'élément optique sont fixés dans un état positionné.
PCT/JP2012/054707 2011-06-22 2012-02-27 Procédé d'ajustement de la position d'un élément optique WO2012176498A1 (fr)

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JP2011-137959 2011-06-22
JP2011137959A JP2014167837A (ja) 2011-06-22 2011-06-22 光学素子の位置調整方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015038798A (ja) * 2013-08-15 2015-02-26 シーゲイト テクノロジー エルエルシー 磁気記録装置およびその製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003045004A (ja) * 2001-07-27 2003-02-14 Fuji Xerox Co Ltd 光アシスト磁気ヘッド及び光アシスト磁気ディスク装置
WO2008081909A1 (fr) * 2006-12-27 2008-07-10 Fujitsu Limited Ensemble de suspension de tête, ensemble de chariot et procédé de fabrication d'un ensemble de coulisseau de tête
JP2011060408A (ja) * 2009-09-04 2011-03-24 Headway Technologies Inc スライダに固定されたレーザダイオードを備えた熱アシスト磁気記録ヘッド

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003045004A (ja) * 2001-07-27 2003-02-14 Fuji Xerox Co Ltd 光アシスト磁気ヘッド及び光アシスト磁気ディスク装置
WO2008081909A1 (fr) * 2006-12-27 2008-07-10 Fujitsu Limited Ensemble de suspension de tête, ensemble de chariot et procédé de fabrication d'un ensemble de coulisseau de tête
JP2011060408A (ja) * 2009-09-04 2011-03-24 Headway Technologies Inc スライダに固定されたレーザダイオードを備えた熱アシスト磁気記録ヘッド

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015038798A (ja) * 2013-08-15 2015-02-26 シーゲイト テクノロジー エルエルシー 磁気記録装置およびその製造方法

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