JP4482485B2 - Head module - Google Patents

Description

  The present invention relates to a head module that records and reproduces information at high density.

  In recent years, in order to cope with a rapid increase in image / moving picture information in the information society, information recording / reproducing apparatuses have been increased in capacity and size. In an information recording / reproducing apparatus using light, since the recording density depends on the light wavelength, the density has been increased by using light having a short wavelength. As a method for realizing a wavelength-independent density, a recording / reproducing principle using near-field light has attracted attention.

The configuration of the recording / reproducing apparatus using near-field light is almost the same as that of the magnetic disk device, and a near-field light head is used instead of the magnetic head. The near-field optical head has a portion that generates near-field light from an optical microscopic aperture or a nanometer-sized protrusion. A near-field optical head is attached to the tip of the suspension arm and floated to a certain height by flying head technology, and an arbitrary data mark existing on the disk is accessed. In order to make the near-field optical head follow the high-speed rotating disk, the head module has a flexure function that stabilizes the posture of the head in response to the waviness of the disk. In the near-field optical head module having such a configuration, as a method of supplying light to the near-field optical head, a method of directly irradiating the head with a laser provided above or in the horizontal direction (for example, Patent Document 1), or an optical fiber And a method of connecting an optical waveguide to a head (for example, Patent Document 2).
JP 2000-131501 (page 5-6, FIG. 1) JP 2001-143316 A (page 4-5, FIG. 2)

  However, in the above-described near-field optical head according to the prior art, light from the light source is stably introduced into the head while maintaining the flying height with a small flying height and a stable posture on the surface of the disk rotating at high speed. It was difficult. For example, in the structure disclosed in Patent Document 1, focus control is performed in response to the surface deflection of the disk by controlling the distance between the relay lenses. It is difficult to move the lens in response to the shaking of the surface. If the incident light is not introduced to the head with high accuracy, the generated near-field light is weak or not localized, which causes an error during data recording / reproduction.

  If the posture of the head at the time of flying is not stable, a head crash that collides with the disk is caused, resulting in fatal damage to the entire storage apparatus. In addition, since the light incident on the head propagates in the air from above the head and reaches the head, it is necessary to arrange an optical mechanism including a lens, its actuator, and in some cases a laser, above the head. There is a problem that it is difficult to reduce the thickness when a structure having a plurality of disks is provided inside the storage apparatus. If one storage device cannot have a plurality of disks, it is difficult to increase the data capacity.

  Further, the structure disclosed in Patent Document 2 allows light to be introduced from a stable direction with respect to the head because the load point on the head that floats on the air coincides with the light introduction portion to the head. On the other hand, since light passes through the load point that is in contact only in a small area of both the head and the suspension arm, light efficiency is reduced due to light scattering and refraction at the load point. There was a problem. Moreover, since the adhesive used when fixing the light introducing portion flows out to a place other than the adhesion portion, contamination with the adhesive is likely to occur. In either case, it is necessary to design a new suspension arm, and it is necessary to optimize the design of the suspension arm in order to obtain desired floating characteristics.

  In order to solve the above-mentioned problems, the present invention relates to a head that receives a flying force by rotation of a disk, and supports the head, and has a predetermined posture and a predetermined flying distance with respect to the disk. A head module comprising: an arm for applying a load load; a light introducing portion for introducing incident light from a light source to the head; and a fixing portion for fixing the light introducing portion to the head. It is formed in the vicinity part of the position extended | stretched in the direction where the said load load is applied from the load point which applies.

  In the invention, it is preferable that the head includes a reflection mirror that reflects light propagating from the light introducing portion emitted from the light introducing portion substantially horizontally with respect to the disk surface and propagates the light toward the disk surface. .

  In the invention, it is preferable that the head includes a mirror substrate on which the reflection mirror is formed.

  Further, the invention is characterized in that the light introduction part has a reflection mirror inside the light introduction part that reflects incident light from the light source substantially perpendicularly to the disk surface.

  In the invention, it is preferable that the head has a lens that condenses the light emitted from the light introduction part and is propagated toward the disk surface.

  According to the present invention, the head has a near-field light element that generates or detects near-field light.

  Further, the invention is characterized in that the head includes a near-field light element substrate having a near-field light element.

  Further, the invention is characterized in that the near-field light element has an optical aperture smaller than the wavelength of incident light from the light source.

  The present invention is also characterized in that the near-field light element has a metal film that enhances near-field light by generating plasmons by incident light from a light source.

  Further, the present invention is characterized in that the light introducing portion is made of an optical fiber.

  Further, the present invention is characterized in that the light introducing portion is composed of an optical waveguide.

  In the invention, it is preferable that the fixing portion where the optical fiber is fixed to the head is in a V groove formed on the head surface.

  Further, the present invention is characterized in that the V-groove is formed by etching utilizing Si crystal anisotropy.

  According to the present invention, a part of the V-groove is formed shallower than the other part, and the optical fiber is fixed to the head in the part.

  In the invention, it is preferable that the head includes a magnetic element that changes the magnetization state of the disk surface.

  In the invention, the head irradiates the disk surface with incident light from a light source, and the magnetic element changes the magnetization state at the irradiation position.

  Further, the invention is characterized in that the light introducing portion includes a fixing member for fixing the optical fiber and the head.

  According to the present invention, the influence on the flying performance of the head due to the light introducing portion being fixed to the head can be reduced to the minimum, and the head can stably follow the runout caused by the high-speed rotation of the disk. Is possible. In addition, since the light introduction part is fixed to the head, the light introduction to the head is stable regardless of the posture of the head. A stable output signal can be obtained. It is possible to achieve both the flying of the head at the nanometer level and stable light introduction.

  Further, according to the present invention, since the light from the light introducing portion is propagated horizontally with respect to the disk surface, the direction inside the head is changed and headed toward the disk, so that no optical mechanism is required above the head. Thus, when a plurality of disks are stored in the storage apparatus, the entire apparatus can be made extremely thin and small. As a result, the capacity of one storage device can be greatly increased.

  Further, according to the present invention, the light from the light introducing portion is redirected by the reflecting mirror provided on the substrate inside the head and is directed to the disk. It becomes possible.

  Further, according to the present invention, since a part of the light introducing portion has a function of changing the propagation direction of light, the head can be formed into a thin structure composed of a single substrate, and as a result, the flying height is reduced. Enables resolution and high S / N signal.

  Further, according to the present invention, since the head has a function of condensing light, the head interacts with the disk through light having sufficient intensity, thereby enabling high resolution and high S / N signal.

  Further, according to the present invention, since the head generates near-field light by converting incident light into near-field light, high resolution exceeding the diffraction limit of incident light can be realized.

  Further, according to the present invention, near-field light is generated by an optical aperture smaller than the wavelength of incident light, so that high resolution independent of the wavelength of incident light can be realized.

  Further, according to the present invention, since the portion that generates near-field light is made of a material that excites surface plasmons by incident light, energy is enhanced by plasmon resonance, and high-field near-field light is concentrated in a fine region. Localize. Thereby, a high resolution and a high S / N signal can be realized.

  Further, according to the present invention, since the light introducing portion is an optical fiber, the head can be easily manufactured at low cost.

  Further, according to the present invention, since the light introducing portion is an optical waveguide, batch manufacturing using a silicon process is possible, and a head having stable performance can be manufactured at low cost.

  Further, according to the present invention, since the optical fiber is fixed to the V groove on the head surface, a stable structure can be easily assembled.

  Further, according to the present invention, since the V-groove on the head surface is formed by anisotropic etching of Si, a structure for fixing the optical fiber by simple and high-precision processing can be produced.

  Further, according to the present invention, since a shallow portion is formed in a part of the V-groove and the optical fiber is fixed at the portion, the optical fiber can be reliably fixed at a correct position just below the load point. Even when there are too many adhesives for fixing, the excess adhesive flows into the deep part of the V-groove, so that no other part of the head is contaminated with adhesive.

  Further, according to the present invention, since the head is mounted with the magnetic element at the same time, optically assisted magnetic recording is possible in which a minute area on the surface of the disk is heated by light and recorded with a magnetic field with the assistance.

  Further, according to the present invention, since the member for fixing the optical fiber and the head is used, the optical fiber can be arranged at an arbitrary position with respect to the load point, and the portion closest to the disk surface in the bottom surface of the head. The near-field light generating element can be designed to be arranged.

(Embodiment 1)
FIG. 1 shows an outline of an information reproducing apparatus using a head module according to Embodiment 1 of the present invention. The information reproducing apparatus according to the present embodiment has a basic configuration similar to that of a conventional magnetic disk apparatus, and a head 106 having a minute aperture (not shown) for generating near-field light is provided on the surface of the recording medium disk 107. The flexure 105 is formed at the tip of the suspension arm 104 so that the disk 107 is rotated at a high speed while being close to several tens of nanometers, and the head 106 always floats with respect to the disk 107 in a constant posture. The suspension arm 104 is movable in the radial direction of the disk 107 by a voice coil motor (not shown). Here, the head 106 is disposed so that the minute opening faces the disk 107.

  The light beam from the laser 101 is guided to the optical fiber 103 through the lens 102 and introduced into the head 106 from the optical fiber 103. Here, although the optical fiber 103 is used as a light introducing portion to the head 106, an optical waveguide manufactured by patterning silicon oxide having a predetermined refractive index may be used. If necessary, the laser 101 can be intensity-modulated by the circuit system 108. In order to make the outline easy to understand, the suspension arm 104, the flexure 105, and the head 106 are shown in an exploded form, but in reality, each is connected and fixed as necessary.

  Light from the optical fiber 103 is introduced into the head 106 from a substantially horizontal direction with respect to the surface of the disk 107. The head 106 changes the propagation direction of this light and directs it toward the surface of the disk 107, and then converts it into near-field light through a minute aperture. Near-field light is localized in a much finer space than the wavelength of light emitted from the laser 101 and interacts with only a fine region on the surface of the disk 107, resulting in the generation of scattered light. A recording dot (not shown) having a size of several to several tens of nanometers is optically recorded on the surface of the disk 107. Light scattered by the interaction between the dot and near-field light is detected by a photodetector (not shown). ) To be an output signal. In the present embodiment, the photodetector detects the light transmitted through the disk 107 by disposing it on the back side of the disk 107, but detects the reflected light from the disk 107 by disposing it on the head 106 side. It is also possible. The recording dots are formed by forming a concavo-convex shape on the surface of the disk 107, but can also be formed by arranging fine regions having different refractive indexes.

  FIG. 2 is an enlarged view of the head 106, a part of the optical fiber 103, and a part of the flexure 105. The head 106 has a structure in which a mirror substrate 201 and a near-field light element substrate 202 are bonded. The mirror substrate 201 is made of Si, and a V-groove 203 is formed on the bottom surface in the drawing. The V-groove 203 reaches the end of the mirror substrate 201 on the right side in the figure, but the left side is formed halfway, and its end is a mirror surface 204. The mirror surface 204 has an inclination of about 55 ° with respect to the surface of the mirror substrate 201. The mirror surface 204 has an Al film (not shown) formed on the surface. The optical fiber 103 is fixed to a part of the V groove 203 with an adhesive 205. This 205 forms a fixing portion for fixing the light introducing portion to the head. The tip surface 206 of the optical fiber 103 is polished at an angle of about 33 ° with respect to the optical axis. The near-field light element substrate 202 is made of quartz glass. A microlens 207 is formed on the upper surface in the drawing, and a conical protrusion 208 is formed on the bottom surface. The cone-shaped protrusion 208 is covered with an Al light shielding film (not shown), but the optical light opening 209 is formed by removing the Al light shielding film only in a minute region of several tens of nanometers at the tip.

  The flexure 105 is a structure formed at the tip of a suspension arm (not shown), and the head 106 receives from the disk 107 (FIG. 1) when the load spring 222 pushes the leaf spring 221 with the load F at the load point 223. The posture of the head 106 is stably maintained in balance with the air levitation force. Incident light 231 propagating through the optical fiber 103 is refracted at the tip surface 206 to become outgoing light 232, reflected by the mirror surface 204, condensed by the microlens 207, and irradiated to the optical opening 209 at the tip of the conical protrusion 208. Is done. The wavelength of the incident light 231 is 405 nanometers, but it may be 800 nanometers or a wavelength exceeding 1 micron. Since the optical aperture 209 is much smaller than the wavelength of the incident light 231, most of the light energy distributed beyond the optical aperture 209 is a component of the near-field light 233.

  FIG. 3 is an enlarged view of the bottom surface of the mirror substrate 201 and the optical fiber 103. The V groove 203 formed on the bottom surface of the mirror substrate 201 has a mirror surface 204 at its end. The tip surface 206 of the optical fiber 103 is polished obliquely. The optical fiber 103 is fixed by an adhesive 205 in a part of the V-groove 203. The adhesive 205 is applied only at the intersection of the straight line extending in the direction of the load F from the load point 223 shown in FIG.

In the head module having such a structure, since the optical fiber 103 is fixed to the head 106 only at the portion immediately below the load point 251, the head 106 follows the undulation of the surface of the disk 107 that rotates at high speed. The optical fiber 103 does not become an obstacle when performing. Further, since the distal end face 206 of the optical fiber 103 always maintains a constant relative position with respect to the head 106, stable light introduction is possible regardless of the posture variation of the head 106. Further, the flexure 105 uses a conventional technique and has a structure optimized for improving the flying characteristics of the head 106. Since light does not pass through an optically complex structure such as the load point 223, light loss during light propagation from the laser 101 to the optical aperture 209 can be minimized. In this way, stable high-efficiency light propagation to the head 106 and suppression of an increase in the risk of the head 106 colliding with the disk 107 can be achieved.
(Embodiment 2)
FIG. 4 is an enlarged view of the mirror substrate 300, a part of the optical fiber 103, and a part of the flexure 105 of the head module according to Embodiment 2 of the present invention. The near-field light element substrate is not shown. The same parts as those in FIG. 2 described in Embodiment 1 are given the same reference numerals, and the description thereof is omitted. The difference from the first embodiment is that, in the V-groove 301, only the vicinity immediately below the load point 223 is a shallow groove 302. The optical fiber 103 is fixed by the adhesive 205 in the shallow groove 302.

  FIG. 5 is a bottom view of the mirror substrate 300 according to the second embodiment. The V groove 301 is the same as in the first embodiment in that the end of the V groove 301 is a mirror surface 204, but the difference from the first embodiment is that the shallow groove 302 is only in the vicinity of the portion immediately below the load point 251. It is a point. Such a V-groove is produced by designing a mask pattern when performing anisotropic etching of Si. FIG. 6 shows a state in which the optical fiber 103 is bonded to the mirror substrate 300. The optical fiber 103 is fixed by the adhesive 205 only in the shallow groove 302 of the V groove 301. This 205 forms a fixing portion for fixing the light introducing portion to the head.

  As a method of fixing the optical fiber 103 to the shallow groove 302 without using the adhesive 205, the width of the shallow groove 302 is narrowed to several to several tens of microns, and the optical fiber 103 is sandwiched between the near-field optical element substrate and the shallow groove 302. There is a method in which two substrates are bonded together. In this case, by providing a V-groove and a shallow groove on the near-field light element substrate side, the optical fiber 103 is fixed to the head 106 only with a narrow width of the shallow groove. These 205 and 302 form a fixing portion for fixing the light introducing portion to the head.

By using the head having such a structure, in addition to the effects described in the first embodiment, the positional accuracy required for the application portion of the adhesive when the optical fiber 103 is bonded may be low. Since the agent flows out to a place other than the shallow groove 302 in the V-groove 301, contamination of the head to other places can be prevented. In addition, the probability that the optical fiber 103 collides with the V-groove 301 is lowered when the posture of the head 106 is changed, and the posture control of the head 106 is facilitated. When the method not using the adhesive 205 is employed, the contact area between the optical fiber 103 and the head 106 becomes very small, so that the head 106 can be further lifted freely.
(Embodiment 3)
FIG. 7 is a bottom view of the mirror substrate 400 according to the third embodiment. The V groove 301 is the same as in the second embodiment in that the end of the V groove 301 is a mirror surface 204 and the shallow groove 302 is formed only in the vicinity of the lower portion 251 immediately below the load point. The difference is that the mirror substrate 400 has a notch 401 connected to the shallow groove 302. Such a V-groove is produced by designing a mask pattern when performing anisotropic etching of Si. FIG. 8 shows a state where the optical fiber 403 is bonded to the mirror substrate 400. The optical fiber 403 is manufactured by obliquely polishing the tip portion, and at the same time as the polishing, the protrusion 410 is formed at a predetermined distance from the tip by an appropriate method such as attaching or adhering means. The optical fiber 403 is fixed to the mirror substrate 400 by the adhesive 205 in the shallow groove 302. At this time, high-precision assembly can be easily performed by fitting the protrusion 410 into the notch 401. These 205, 401, and 410 form a fixing portion for fixing the light introducing portion to the head.

By using the head having such a structure, in addition to the effects described in the first and second embodiments, the bonding process between the optical fiber 403 and the mirror substrate 400 is simple and highly accurate.
(Embodiment 4)
FIG. 9 is an enlarged view of the head 501, part of the optical fiber 502, and part of the flexure 105 according to the fourth embodiment of the present invention. Unlike the first to third embodiments, the head 501 has a function of changing the light propagation direction in the optical fiber 502 instead of the mirror substrate. The optical fiber 502 is produced by fusing a single mode fiber 515, a graded index (GI) fiber 516, and a coreless fiber 517 in this order from a light source (not shown, right end in the drawing). . The tip of the coreless fiber 517 is a reflecting surface 518 polished at an angle of 45 °. The near-field light element substrate 511 is substantially the same as in the first to third embodiments, but is provided with a notch groove 512 for preventing interference with the optical fiber 502. The flexure 105 is the same as in the first to third embodiments, and has a structure in which the load spring 222 pushes the leaf spring 221 with the load F at the load point 223. Incident light 231 from a light source (not shown) propagates through the single mode fiber 515 and then becomes parallel light after spreading the light beam within the GI fiber 516. Further, after propagating through the coreless fiber 517, it is reflected by the reflecting surface 518 and directed toward the near-field light element substrate 511. The subsequent steps are the same as those described in the first embodiment (FIG. 2).

  FIG. 10 shows the relationship between the bottom surface of the leaf spring 221 and the optical fiber 502. A fixed plate 531 is bonded to the optical fiber 502. The fixed plate 531 and the leaf spring 221 are bonded by an adhesive 205 in the vicinity of the load point 223. These 205 and 531 form a fixing portion for fixing the light introducing portion to the head. The optical fiber 502 is bonded to the fixed plate 531, but is not in contact with the leaf spring 221 or the near-field light element substrate (511 in FIG. 9). Incident light 231 does not pass near the load point 223.

In addition to the effects realized in the first to third embodiments, the head having such a structure is thin because the head 501 is made of a single substrate. In the case of a head that floats on the air, the flying height depends on the size of the head, but the flying height can be greatly reduced by making it thin. By reducing the flying height, the intensity of near-field light interacting with the disk can be greatly increased, and the near-field light can be localized in a smaller area. As a result, the S / N can be improved and the data transfer rate can be increased. In the structures of the first to third embodiments, the portion that generates near-field light is shifted in the optical axis direction of the optical fiber with respect to the portion immediately below the load point. In the head according to the present embodiment, The portion that generates the near-field light is shifted from the load point in the direction orthogonal to the optical fiber. Thus, the position where the near-field light is generated can be designed independently of the load point. The head floats in a slightly inclined position with respect to the disk surface, and by placing the near-field light generator nearer to the disk surface than just below the load point, the same effect as reducing the flying height is achieved. You can have it.
(Embodiment 5)
FIG. 11 is an enlarged view of the head 601, part of the optical fiber 502, and part of the flexure 105 in the head module according to Embodiment 5 of the present invention. Since the optical fiber 502 and the flexure 105 are the same as those in FIG. 9 in the fourth embodiment, the same reference numerals are given and description thereof is omitted. The head 601 includes a near-field light and a magnetic field generating element substrate 611. The mechanism for generating the near-field light 233 is the same as in the fourth embodiment. The difference from the fourth embodiment is that a magnetic head element 612 is mounted. The magnetic head element 612 is connected to a control circuit (not shown) by wiring 613, and generates a magnetic field 614. Since the magnetic field 614 and the near-field light 233 are generated at positions very close to each other, the magnetic field 614 is magnetized in a state where the magnetic field on the surface of the disk (not shown) is heated by the near-field light 233 to reduce the coercive force. Recording is performed by reversing. By using the head having such a structure, in addition to the effects described up to the fourth embodiment, magnetic recording using assist by the near-field light 233 is performed, and higher-density recording / reproduction is possible.
(Embodiment 6)
FIG. 12 shows the shape of the near-field light generating element part in the head module according to Embodiment 6 of the present invention. FIG. 12A shows a structure in which a conical protrusion 208 formed of a triangular frustum is covered with a light shielding film (not shown) and the light shielding film is removed only at the tip portion, so that a minute optical opening 209 is formed. . Light introduced from a light introducing portion such as an optical fiber becomes near-field light by this optical aperture 209 and is distributed in the vicinity. FIG. 12B shows a structure in which a minute through hole 702 is provided in the light shielding flat film 701, and near-field light is similarly generated from the through hole 702. In FIG. 12C, the side surface of the quadrangular pyramid 801 is covered with a light shielding film, and a metal film 803 is provided in a triangular shape at a part of the tip 802. The front end portion 802 may be flat or may have a cone shape with the center protruding. High-resolution and high S / N are realized by the near-field light being strongly localized in the gap 804 of the metal film 803. The metal film 803 can be made of a material that generates surface plasmon by visible light, such as Au or Ag. In this case, near-field light having extremely high energy can be localized by an enhancement effect by plasmon. it can. The near-field light generating unit for carrying out the present invention is not limited to that described above, and any unit having a function of generating near-field light from incident light may be used.

1 is a schematic diagram of an information reproducing apparatus using a near-field optical head according to Embodiment 1. FIG. The enlarged view of a head, an optical fiber (part), and a flexure (part). The bottom view of a mirror board | substrate and the enlarged view of an optical fiber. The enlarged view of the mirror substrate of the head module which concerns on Embodiment 2, an optical fiber (part), and a flexure (part). FIG. 6 is a bottom view of a mirror substrate according to a second embodiment. The figure which shows the state which bonded the optical fiber to the mirror board | substrate. FIG. 10 is a bottom view of a mirror substrate according to a third embodiment. The figure which shows the state which bonded the optical fiber to the mirror board | substrate. The enlarged view of the head which concerns on Embodiment 4, an optical fiber (part), and a flexure (part). The figure which shows the relationship between the bottom face of a leaf | plate spring, and an optical fiber. FIG. 6 is an enlarged view of a head, an optical fiber (part), and a flexure (part) of a head module according to a fifth embodiment. FIG. 11 is a diagram showing the shape of a near-field light generating element part in a head module according to Embodiment 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Laser 102 Lens 103 Optical fiber 104 Suspension arm 105 Flexure 106 Head 107 Disk 108 Circuit system 201 Mirror substrate 202 Near field optical element substrate 203 V groove 204 Mirror surface 205 Adhesive 206 Front end surface of optical fiber 103 207 Micro lens 208 Conical projection 209 Optical aperture 221 Leaf spring 222 Load section 223 Load point 231 Incident light 232 Emission light 233 Near field light 251 Immediately below the load point 300 Mirror substrate 301 V groove 302 Shallow groove 400 Mirror substrate 401 Notch 403 Optical fiber 410 Protrusion 501 Head 502 Optical fiber 511 Near-field optical element substrate 512 Notch groove 515 Single mode fiber 516 Graded index (GI) fiber 517 Coreless fiber 518 Reflecting surface 531 Fixing plate 601 Head 611 Near-field light and magnetic field generating element substrate 612 Magnetic head element 613 Wiring 614 Magnetic field 701 Light shielding flat film 702 Through hole 801 Square frustum 802 Tip 803 Metal film 804 Metal film 803 Clearance F Load

Claims (18)

A head that receives a flying force by rotation of a disk; an arm that supports the head and applies a load to the head so that the disk has a predetermined posture and a predetermined flying distance; and a light source for the head In a head module comprising a light introduction part for introducing incident light from and a fixing part for fixing the light introduction part to the head,
The head module is characterized in that the fixing portion is formed only at one or both of a position extending in a direction in which the load is applied from a load point to which the load is applied and a vicinity thereof.   2. The reflection head according to claim 1, wherein the head includes a reflection mirror that reflects the light emitted from the light introduction portion emitted from the light introduction portion substantially horizontally with respect to the disk surface and propagates the light toward the disk surface. The head module described.   The head module according to claim 2, wherein the head includes a mirror substrate on which the reflection mirror is formed.   2. The head module according to claim 1, wherein the light introduction section includes a light introduction section internal reflection mirror that reflects incident light from the light source substantially perpendicularly to the disk surface.   5. The head module according to claim 1, wherein the head has a lens that collects light emitted from the light introduction portion emitted from the light introduction portion and propagates the light toward the disk surface. .   6. The head module according to claim 1, wherein the head has a near-field light element that generates or detects near-field light.   The head module according to claim 6, wherein the head includes a near-field light element substrate having the near-field light element.   The head module according to claim 6 or 7, wherein the near-field light element has an optical aperture smaller than a wavelength of incident light from the light source.   9. The head module according to claim 6, wherein the near-field light element has a metal film that enhances the near-field light by generating plasmons by incident light from the light source.   The head module according to claim 6, wherein the light introducing portion is made of an optical fiber.   The head module according to any one of claims 6 to 9, wherein the light introducing portion is formed of an optical waveguide.   11. The head module according to claim 6, wherein the fixing portion to which the optical fiber is fixed to the head is in a V groove formed on the head surface.   The head module according to claim 12, wherein the V groove is formed by etching utilizing Si crystal anisotropy.   14. The head module according to claim 12, wherein a part of the V groove is formed shallower than other parts, and the optical fiber is fixed to the head in the part. The head module according to claim 14, wherein the fixing portion includes a notch connected to the part and a protrusion connected to the optical fiber and fitted into the notch. Head module according to any one of the head, according to claim 1 to 15, characterized in that it comprises a magnetic element for changing the magnetization state of the disk surface. Head module according to claim 16 wherein the head, which irradiates the incident light from the light source to the disc surface, the magnetic element at the irradiation position is characterized by changing the magnetized state.   The head module according to claim 6, wherein the light introducing portion includes a fixing member that fixes the optical fiber and the head.

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