JP2004158189A - Recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact recording and reproducing device in which a floating type head is moved on the flat surface of a disk recording medium in a direction parallel to the surface and in a fan shaped manner and which has functions for dealing with high speed access and high density recording. <P>SOLUTION: In the device, a slider and a head are arranged and fixed on the tip end of a swing arm member which is capable of moving in a fan shaped swinging manner. A solid immersion lens is used for the head and light beams are radiated from the fulcrum of the rotating shaft of the swing arm member along the arm. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a head such as a magneto-optical head and a recording / reproducing apparatus such as a magneto-optical recording / reproducing apparatus using the same, and more specifically, a light for reducing a diffraction limit of a spot diameter of a laser beam irradiated on a recording medium. The present invention relates to a magnetic head and a recording / reproducing apparatus capable of performing high-density recording using the magneto-optical head.

  In recent years, a magneto-optical recording medium capable of recording a large amount of data at a high density and rapidly recording / reproducing has been attracting attention in response to multimedia. For example, recording on an overwritable magneto-optical recording medium is performed by irradiating the magneto-optical recording medium with laser light and applying a magnetic field corresponding to the input information to the irradiation position of the laser light. At the time of reproducing the magneto-optical recording medium, information is reproduced by irradiating the magneto-optical recording with a laser beam that is weaker than at the time of recording, and detecting the polarization angle of reflected light that depends on the recording magnetization direction of the return light of the laser beam. Is done.

  Conventionally, as shown in FIG. 1, a head mechanism used in such a magneto-optical recording / reproducing apparatus is such that each of an optical head 2 and a magnetic head 3 is opposed to each other on a center line of each side of a disk recording medium. And used. In this case, since each of the optical head 2 and the magnetic head 3 is large in shape and weight, each of the heads 2 and 3 is supported by the support member 7 and the drive motor 6 rotates the screw rotating shaft 4 to record the disk. Information is recorded, reproduced, and erased by moving on the medium 1. This method increases the size and weight of the recording / reproducing apparatus, and can respond to the demands of the disk recording medium and the recording / reproducing apparatus, such as small size, light weight, large capacity, and high-speed recording / reproducing / erasing access. There are drawbacks that cannot be made. On the other hand, a magneto-optical head mechanism 20 shown in FIG. 2 is known as a technique for integrating the optical head 2 and the magnetic head 3 to respond to the downsizing of the recording / reproducing apparatus. This is a combination of a driving device 13 for the objective lens 10 of the optical head system 12 and a magnetic head slider 14 on which a magnetic head coil 21 is arranged, and a laser beam 11 for irradiating the magnetic head slider 14 from the optical head. This is a configuration in which a transmission hole 43 for the convergent light 32 is formed. Although a three-dimensional volume is considerably reduced in a recording / reproducing apparatus using this type of magneto-optical head, it is sufficient to meet the demands of the recording / reproducing apparatus, such as small size, light weight, large capacity, and high speed recording / reproducing / erasing access. Not.

  On the other hand, the head is attached to and fixed to the tip of the arm, the fulcrum of the arm is set near the disk recording medium, and the arm is swung in parallel with the disk recording medium surface, so that the information on the disk recording medium is obtained. Is known. A driving system for moving the optical head in parallel with the surface of the disk recording medium by a swing arm or a linear motor has been proposed in Japanese Patent Laid-Open No. Hei 5-54457. A method of driving the optical head by a swing arm has been proposed in JP-A-8-7309 and JP-A-3-203848. A configuration in which a laser light reflecting surface is formed on a magnetic head is proposed in Japanese Patent Application Laid-Open No. 3-280233. The problem with this method is that it is not possible to obtain optimal features for the small size and light weight required for the recording / reproducing apparatus. As a recording / reproducing drive capable of meeting the remarkable demands for downsizing and high recording density of a magneto-optical recording medium, there are problems such as further reduction in size and weight, and increase in the speed of information recording / reproducing / erasing access. Further, when the optical head and the magneto-optical head are driven by the currently known swing arm system, there is a problem that the head collides with the rotating disk recording medium to cause a head crash, thereby destroying the head and the disk recording medium.

  By the way, the problems of the recording / reproducing drive are that the volume of the device is small and that it is as compact as possible, that the access for recording / reproducing and erasing is highly rapid, and that the information signal pits on the recording medium that are finer than ever A read / write head function capable of reading, recording, and erasing magnetic domain or domain signals, and that the head portion is lightweight, and as a result, the weight of the entire recording / playback drive is reduced. And so on. To meet these needs, there is a need for a recording medium such as a magneto-optical disk having a small diameter, a light weight, a high recording capacity capable of high-density recording, and a function capable of high-speed recording / reproduction. Is progressing. What is important when reducing the volume of the recording / reproducing drive is to reduce the thickness of the recording / reproducing drive. In order to solve this problem, the movable direction of the recording / reproducing head for accessing the magneto-optical disk mainly moves parallel to the recording plane of the magneto-optical disk, and moves in the direction perpendicular to the recording plane of the magneto-optical disk. Is to be as small as possible. Further, in order to further speed up the access of the recording / reproducing head, it is necessary to use a head mechanism with a light access and moving movement, and no head crash occurs due to a collision between the recording / reproducing head and the magneto-optical disk. Control.

  The present invention relates to a recording / reproducing drive device capable of recording / reproducing and erasing high-capacity information at a high speed on a disk-shaped information recording medium having a high recording density, wherein an optical head or an optical disk is provided at the tip of a swing arm. It is equipped with a swing arm head to which a magneto-optical head that combines a head and a magnetic head is attached and fixed, and the head part that is installed and fixed especially at the tip of the arm is an objective lens driving device and an objective A solid slider is formed on the laser beam transmitting section, which is composed of a head slider formed with a laser beam transmitting section centered on the center line of the lens and a magnetic coil and centered on the center line of the objective lens of the head section. It relates to a lens in which a lens is fixed and used. By installing and using a solid imaging lens, it is possible to read, write, and erase extremely fine information signal pit elements, information magnetic domain signals, information domain signals, and the like on the recording layer of the recording medium.

  The swing arm head of the present invention is attached to a fulcrum near the outer periphery of a disk recording medium to be mounted on a recording / reproducing drive device, and the swing arm head is parallel to the recording surface of the disk recording medium around this fulcrum. There is a function of recording, reproducing, and erasing information on a disk recording medium while moving in a fan shape.

  The swing arm optical head or the swing arm magneto-optical head of the present invention irradiates an extremely small “laser beam spot” unit signal to a small high-density disk recording medium, or By adding a fine "magnetic field" unit signal, a high-density information signal such as an ultra-fine "pit" unit signal or an ultra-fine "magnetic domain or domain" unit signal can be processed at a high speed in recording / reproduction / erasing information processing. This is a head mechanism having a function that can be performed at a speed. The recording / reproducing apparatus according to the present invention includes a swing arm including at least a head unit, a swing arm unit, and a light beam splitter, and the head unit swings near the outer periphery of a recording medium mounted on the recording / reproducing apparatus. The head is installed and fixed at the tip of an arm on which the shaft is arranged, and the head is composed of an objective lens driving device and a laser beam transmitting portion forming body centered on the center line of the objective lens. The laser beam transmitting portion forming body of the head portion may be constituted by a head slider having a head floating function. The recording medium used in the recording / reproducing apparatus of the present invention is a recording medium such as an optical recording medium, a magneto-optical recording medium, a magnetic recording medium for performing light beam tracking, and particularly, an optical disk recording medium, a magneto-optical disk recording medium, and a light beam. -Suitable for a magnetic disk recording medium or the like for performing tracking. Among the recording / reproducing devices of the present invention, the magneto-optical recording / reproducing device includes at least a head portion, a slider, a swing arm portion, and a swing arm including a light beam splitter, and the head portion is provided in the magneto-optical recording / reproducing device. A swing drive shaft is arranged near the outer periphery of the mounted magneto-optical disk. Further, in the recording / reproducing apparatus of the present invention, the recording / reproducing apparatus further includes a swing arm including at least a head section, a slider, a swing arm section, and a light beam splitter, and the head section includes a disk recording medium mounted on the recording / reproducing apparatus. A swing drive shaft is disposed in the vicinity of the outer periphery of the swing drive shaft, and a balance swing arm having a fulcrum on the swing drive shaft is installed and fixed to the tip of the disk recording medium side, and the other of the balance swing arm is provided. At the end, a signal detection system device of the disk recording medium may be mounted and fixed.

  The swing arm head of the present invention is attached to a fulcrum near the outer periphery of a disk recording medium mounted on a recording / reproducing drive device, the entire arm head, or only the head of the swing arm moves on the swing arm, The disk recording medium may have a function of recording, reproducing, and erasing information on the disk recording medium while moving linearly from the fulcrum in a direction substantially parallel to the recording surface of the disk recording medium in a radial direction. A linear motor is used as the driving means for moving the head linearly.

  The swing arm of the present invention, or the head body attached to the arm, with the rotation of the disk recording medium, has a function of generating a negative pressure of the convective atmosphere, and a positive pressure, to float the head body, It is composed of a head slider having a portion for transmitting the light beam spot light, a magnetic coil or a film-shaped magnetic coil, an objective lens driving device, a laser light reflecting mirror, and the like. The portion of the head slider that transmits the light beam spot light may be a hollow hole or may be formed of transparent ceramic or transparent resin. A lens, or a solid immersion lens, can be fixedly used.

  The swing arm of the present invention, or a head body attached to the arm, not only performs tracking and information recording / reproduction / erasing of an information signal on an information recording area of a disk recording medium by irradiating a beam from an optical head, but also swings.・ A function to control the flying height of the arm and focusing necessary for recording / reproducing / erasing information signals, etc., especially to control and drive the objective lens driving device and to prevent the swing arm head from crashing I do.

The magneto-optical head used by being attached to the swing arm of the present invention uses a solid image lens as an optical element for condensing recording light on a recording medium. The optical element is made of a material having a refractive index larger than 1. FIG. 12 shows an example of the optical element 101. FIG. 12 is a conceptual diagram illustrating the image forming principle of the optical element 101. The conditions for improving the recording density by setting the spot diameter of the laser beam applied to the recording medium 103 to a smaller spot diameter will be described. Generally, the spot diameter S is defined by the following equation (1).
(Equation 1)
S = λ / (2NA) = λ / (2n ・ sinθmax) (1)

  Here, the wavelength of the laser light incident on the optical element 101 is λ, the numerical aperture of the optical element 101 is NA, the refractive index of the optical element 101 is n, and the outermost light envelope of the incident light beam (solid line in FIG. 12). The angle formed by the optical axis (incident angle) is θmax. Assuming that the wavelength λ of the laser light is constant, it can be seen from the above equation (1) that the NA should be increased in order to reduce the spot law S. Since NA is defined by NA = nsin θmax, to obtain a large NA, the refractive index n and the angle θmax must be increased. Therefore, when a material having a high refractive index is used for the optical element 101, the wavelength of the incident light becomes short inside the optical element 101. Further, when the incident light is refracted on the surface of the optical element 101 and condensed in the optical element 101, the angle θmax between the optical axis and the incident light can be made larger in the optical element 101 than before the light enters the optical element 101.

The optical element 101 is a hemispherical lens formed by cutting a part of a sphere having a radius r. The cut surface of the optical element 101, that is, the exit surface 101a of the optical element 101 is cut perpendicular to the optical axis of the incident light. The cutting position of the optical element 101 is located at r / n from the center of the sphere. When the magneto-optical head on which the optical element 101 is mounted is levitated, the exit surface 101a of the optical element 101 is set so that the surface 103a of the recording medium 103 is parallel. When the incident light indicated by the solid line in FIG. 12 is refracted by the cross section of the spherical lens of the optical element 101 and the incident light is converged toward a point on the emission surface 101a, the optical element 101 passes through an evanescent field (gap of air). Thus, a spot is irradiated on the recording medium 3 arranged on the emission surface 101a side of the optical element 101. Therefore, the distance between the optical element 101 and the recording medium 103 must be within the attenuation distance of the evanescent light. The optical element 101 forms an image at a position (on the surface 103a of the recording medium 103) where the extended broken line of the incident light in the optical element 101 shown by the solid line intersects. The optical element 101 increases NA up to the square of n by shortening the wavelength λ of incident light in the optical element 101 and increasing the angle θmax due to refraction of the optical element 101 on the spherical surface, as described above. Can be. In other words, in theory it can be reduced spot diameter of the laser beam up to 1 / n ^2. Thereby, the optical element 101 makes the spot formed on the recording medium 103 smaller than the minimum spot obtained in vacuum.

  In the magneto-optical head of the present invention, by incorporating a magnetic coil in the slider, it is possible to reduce the size by one layer as compared with the related art. In addition, since the magnetic coil is arranged on the outer periphery of the optical element 101, the distance between the recording medium and the magnetic coil is reduced, so that the current flowing through the magnetic coil when applying a magnetic field can be reduced. Since the optical path of the laser light is not blocked, the recording medium can be efficiently irradiated with the laser light. Since the magnetic coil is provided at a position closer to the recording medium than the light emitting surface of the optical element 101, the distance between the magnetic coil and the recording medium is reduced, and the recording / reproducing apparatus using the magneto-optical head configured as described above. Power consumption can be reduced. It is desirable to use a film-shaped coil as the magnetic coil. By configuring the magnetic coil with a film-shaped coil, the distance between the recording medium and the magnetic coil can be reduced. Further, by making the inner diameter of the magnetic coil smaller than the outer diameter of the optical element 101, a more stable external magnetic field can be applied to the recording medium.

  It is preferable to use a magnetic material that transmits light for the magnetic core. Thus, since the optical path of the laser light irradiated toward the recording medium is not blocked, the recording medium can be efficiently irradiated with the laser light. The magnetic material includes, for example, transparent ferrite. In the magneto-optical head of the present invention, it is preferable that at least a part of the optical element is made of a magnetic material that transmits laser light. By employing such a configuration, the number of components used in the magneto-optical head can be reduced and the magneto-optical head can be downsized. Further, a magnetic material that transmits laser light can be disposed only near the center orthogonal to the laser light emission surface of the optical element, whereby the positioning accuracy of the external magnetic field can be improved.

  According to the present invention, in the magneto-optical recording / reproducing drive device using the swing arm magneto-optical head, the movement, scanning, and access of the magneto-optical head operate in a space having a small thickness parallel to the magneto-optical disk surface. The magneto-optical recording and reproducing drive device can be made thin and compact. Therefore, the effect that the magneto-optical recording / reproducing apparatus can be reduced in accordance with the reduction in the diameter of the magneto-optical disk can be obtained. In addition, since the swing arm magneto-optical head can be accessed by a small fan-like movement, the speed of access can be further improved because acceleration control is performed at the swing angular velocity of the arm. Furthermore, by using a solid immersion lens for a magneto-optical head, it is possible to record information on a disk recording medium at a high density with signals such as highly fine information pits, magnetic domains, or domains, and to record the recorded signal. The effect of enabling reading and erasing is also obtained. Furthermore, the use of the film-shaped magnetic coil makes the magneto-optical head light, and the use of a lightweight swing arm reduces the weight of the entire recording / reproducing drive. Further, since the head flying slider is used in the magneto-optical head, collision between the head and the magneto-optical disk can be avoided, and an effect of preventing head crash can be obtained.

  The present invention is not limited to a magneto-optical head and a magneto-optical recording disk, but also includes various other information recording media such as a read-only disk, a phase-change disk, and a write-once disk, and a general head used for the same. Needless to say, the present invention can be applied to a recording / reproducing apparatus using these.

  Embodiments and examples of a recording / reproducing apparatus according to the present invention will be described with reference to the drawings.

  FIG. 3 shows a first embodiment of the present invention in which a floating type magneto-optical head 53 is fixedly mounted on the tip of a swing arm 56 via a suspension 55 as a head of an information recording / reproducing apparatus. . The fulcrum 52 of the rotation of the swing arm 56 is installed near the outer periphery of the disk recording medium 51, and moves around the recording areas (a), (b), and (c) in the radial direction of the disk recording medium 51 around the center. The information processing access of the entire recording area is performed. The suspension 55 stably maintains the fixed position of the magneto-optical head unit 53 in accordance with the floating function of the slider attached to the magneto-optical head unit 53. The light source of the laser beam such as an information signal is fixed to the recording / reproducing apparatus, and passes through a laser beam splitter (not shown) installed near the rotation axis 52 of the swing arm 56, and then the laser beam The light is sent from the window 54 to the magneto-optical head 53. FIG. 4 shows an optical system relating to a laser beam irradiation path of the magneto-optical head unit 53. The optical system fixed to the recording / reproducing device is P1. On the other hand, the mirror 2, the objective lens 71, the solid immersion lens 72, and the like of the movable optical system P2 are installed on the swing arm 56, and the mirror 1 is installed on the rotation shaft 52 of the swing arm 56. On the magneto-optical disk 51, the track pit signals in the recording area tracks of the recording layer are arranged in a wobble pattern by a sample servo method. It was mounted on a spindle of a rotary drive shaft of a reproducing apparatus and used.

  In the optical system shown in FIG. 4 of the first embodiment, the components arranged in the magneto-optical head unit 53 are provided with an objective lens driving device and an opening for transmitting a laser beam centered on the center line of the objective lens. And a magnetic head using a thin-film magnetic coil having an annular coil. The center of the laser beam transmitting hole of the head floating slider is disposed on the extension of the center line of the objective lens. The magneto-optical head is arranged and fixed on the swing arm 56 and used as a swing arm magneto-optical head. Others are the same as (Example 1).

In the optical system shown in FIG. 4 of the first embodiment, the solid immersion lens 72 in the movable optical system of the magneto-optical head 53 installed on the swing arm 56 The side surface of the magneto-optical disk 51 is selected from a compound, TiN (titanium nitride), SiN (silicon nitride), SiO ₂ (silicon oxide) or the like, and is formed of a film layer of at least one compound or a plurality of these compounds. Coating coating with the combined membrane layer was used. In addition to a film layer of the above compound, a material obtained by coating a highly hard crystalline carbon film layer of amorphous carbon or DLC (diamond-like carbon) by sputtering was also used.

  The pre-pit signal formed on the recording layer of the magneto-optical disk 51 of the first embodiment has the structure shown in FIG. In the sample servo system, the track pit signals 6 and 11 are arranged in wobble pits, and the clock pit 3 and the servo signal access mark 16Tr are formed as shown in FIG.

  FIG. 5 shows an embodiment of a recording / reproducing drive device for a disk recording medium equipped with a swing arm magneto-optical head having a structure in which all the optical systems related to the laser beam of the magneto-optical head are mounted on the swing arm. FIG. 6 is a block diagram of the entire optical system. In this embodiment, a fixed optical system P1 (see FIG. 4) is separated into an optical system 1 and an optical system 2, and a portion of the optical system 1 including a laser light source 57, a collimator lens 58, and a prism 59 is a recording / reproducing drive device. And a portion of the optical system 2 including the signal detectors 68a, 68b, 68c, and 68d, and a portion of the optical system 3 of the system including the beam splitter 60, the mirror 69, the objective lens 71, and the solid immersion lens 72. Is attached to the arm of the swing arm magneto-optical head. FIG. 5 is a plan view of the swing arm magneto-optical head with the optical system mounted in such an arrangement as viewed from above. The magneto-optical head 53b on the swing arm accesses the recording, reproduction, and erasure of information while moving along the recording surface of the magneto-optical recording disk 51 along a locus 75. This swing arm is a continuum of the arm 56 and the arm 73 around the rotation axis 52, and the beam from the laser light source passes through the optical path chamber 74 and is split by the beam splitter 60 attached to the rotation axis 52. The light proceeds to the magnetic head 53, and the reflected light after being accessed by the magneto-optical recording disk 51 is received by the detector of the optical system 2 fixed to the arm 73. The arm 73 on which the optical system 2 is disposed on the swing arm and the arm 56 on which the optical system 3 is disposed are configured so that the weight is balanced about the rotation axis 52.

  In the optical system shown in FIG. 5 of (Embodiment 5), the components arranged in the magneto-optical head 53b are a solid-state immersion lens which receives a laser beam centered on the objective lens driving device and the center line of the objective lens. A solid immersion lens comprising a head floating slider having a lens 72, a magnetic head using a thin-film magnetic coil having an annular coil, and the like, wherein the position of the head floating slider has a center line extending from the center line of the objective lens. A magneto-optical head having an arrangement of 72 is arranged and fixed on the swing arm 56 and used as a swing arm magneto-optical head. Others are the same as (Example 5).

  (Embodiment 5) FIG. 7 shows an embodiment of an optical system installed and fixed to the arm 73 of the swing arm on the side opposite to the magneto-optical disk side. On the arm 73 side, both the optical system 1 including the light source shown in FIG. 6 and the optical system 2 including the detector for detecting a signal from the recording medium are installed and fixed to the arm 73 of the swing arm. . The direction of the transmission / return laser beam between the magneto-optical head 53b installed and fixed on the arm 56 of the swing arm and the optical system 1 and the optical system 2 on the arm 73, and the magneto-optical head 53b A magnet 80 and a coil 81 for controlling the rotation of the drive shaft 52 of the swing arm are attached to the arm 73 of the swing arm. The transmission and return of the laser beam for the magneto-optical head 53b are sorted by the 60 beam splitter 1 installed on the arm rotation shaft 52. Others are the same as (Example 5).

  The pre-pit signal recorded on the magneto-optical disk 51 used in (Embodiment 5) is formed in the form of a pre-pit area 78 shown on the magneto-optical disk 51 in FIG. The format of the prepits is as shown in FIG. 9 and is the same as in (Example 4). The other configuration of the magneto-optical recording / reproducing apparatus is the same as that of the fifth embodiment.

  FIG. 10 shows an embodiment in which the magneto-optical disk 51 used in (Embodiment 5) is used in a disk cartridge. The magneto-optical disk 51 is contained in the case of the disk cartridge 82 in FIG. 10 (not shown). When the disk cartridge 82 is not used, the magneto-optical head insertion port and the drive motor drive shaft spindle port are sealed by a shutter 83. When inserted into the recording / reproducing apparatus and used, the projection 869 in the recording / reproducing apparatus drives the shutter slider 85 to open the shutter 83. Thereafter, the swing arm 56 is driven to rotate, and the magneto-optical head at the tip of the swing arm 56 is swept in a fan shape on the surface of the magneto-optical disk 51 in the case of the disk cartridge 82 in a direction parallel to the surface of the magneto-optical disk 51. Access while moving.

  FIG. 11 shows an embodiment of a magneto-optical head 91 of a linear motor movable type. While a magneto-optical head driver 92 slides on an arm 95 equipped with a linear motor 94 movement guide rail 93 installed in the magneto-optical recording / reproducing apparatus, it moves in a direction 96 parallel to the surface of the magneto-optical disk 51. Access while moving linearly. As for the optical system, the fixed optical system and the movable optical system described in FIGS. 4 and 6 are integrated together, or the optical system 1 and the optical system 2 are integrated together and fixed to the fixed optical system 90 in FIG. Install. Transmission and reception of a laser beam between the fixed optical system 90 and the driver 92 of the magneto-optical head 91 are performed through a window 97 of the magneto-optical head 91. The magneto-optical head 91 is provided with a mirror 69, an objective lens 71, and a solid-state immersion lens 72, an optical system part, a head floating slider 14, and a magnetic head part using a thin-film magnetic coil having an annular coil. Fixed. The solid immersion lens 72 and the thin-film magnetic coil having the annular coil are installed on the slider 14 for flying the head.

  FIG. 13 shows an eleventh embodiment of the flying type magneto-optical head according to the present invention. FIG. 13 is a sectional view when the magneto-optical head is cut in the longitudinal direction of the slider 102. The flying type magneto-optical head includes a slider 102 having a solid immersion lens 100 as an optical element and a magnetic coil 104 for applying an external magnetic field. The slider 102 is formed with a through hole 102a having substantially the same diameter as the outer periphery of the solid immersion lens 100, and the solid immersion lens 100 is fitted into the through hole 102a as shown in FIG. The light exit surface 102a of the solid immersion lens 100 is located at the same height as the slider bottom surface. The magnetic coil 104 is embedded above the noble hole 102a of the slider 102 so as to surround the outer periphery 100b of the solid immersion lens 100. The slider 102 is connected to an actuator (not shown) of the magneto-optical recording / reproducing apparatus main body via a leaf spring support mechanism (not shown). With such a leaf spring support mechanism, when the slider 102 flies, the emission surface 100a of the solid-state image lance 100 is parallel to the magneto-optical recording medium 51, and floats close to the magneto-optical recording medium 51 within the attenuation distance of the evanescent light. Is done. In such a structure, the recording laser light emitted from above the solid immersion lens 100 passes through the solid immersion lens 100 and is focused on the magneto-optical recording medium 51, and a spot smaller than the theoretical minimum spot diameter in the air. Is formed on the magneto-optical recording medium 51. This small spot is formed by using a member having a refractive index n larger than the refractive index of air in the solid image lens 100 according to the same principle as the liquid immersion lens, and condensing the light in the solid image lens 100. At the time of recording information, laser beam irradiation and magnetic field application by the magnetic field coil 104 are performed according to the laser beam irradiation timing controlled on the magneto-optical recording medium 51 and the magnetic field application timing according to the input information.

  FIG. 14 shows a case where the group image lens 101 of the flying type magneto-optical head of FIG. In order to mount the solid image lens 110 on the slider 102 in FIG. 13, the portion 105 of the slider 102 where the solid image lens 110 is installed is formed of a member for transmitting laser light, for example, glass. The solid immersion lens 110 is fixed to the lens mounting portion 102b outside the laser light transmitting member 106. The magnetic coil 104 is built in the slider 102 as in the case of the first embodiment.

  The flying type magneto-optical head of FIG. 15 includes a magnetic core 102c instead of the laser beam transmitting member 106 of the flying type magneto-optical head. The magnetic core 102c is desirably made of a material that transmits laser light, has a small coercive force, and has a high saturation magnetic flux density. For example, transparent ferrite, yttrium iron garnet, and rare earth iron garnet are preferable. Since the magnetic core 102c is easily magnetized by the external magnetic field applied from the magnetic coil 104, the magnetic flux can be converged below the solid-state image lens 100, and thereby the magnetic flux applied to the magneto-optical recording medium 130 can be improved. Control becomes easy.

  The floating type magneto-optical head shown in FIG. 16 has a structure in which the magnetic coil 104 is incorporated below the solid image lens 100 in the magnetic coil shown in FIG. The magnetic coil 104 is joined to the light emitting surface 100a of the solid-state imager 100. In this configuration, the magnetic coil 104 is arranged at a position where the light beam emitted from the solid immersion lens 100 is not blocked. In this embodiment, the magnetic coil 104 is disposed at a position closer to the magneto-optical recording medium 130 than the light exit surface 100a of the solid-state imager 100. Therefore, it is preferable that the magnetic coil be as thin as possible. For example, it is preferable to use a film-shaped magnetic coil 1310 having an annular coil as shown in FIG. 17A or a film-shaped magnetic coil 132 having a rectangular coil as shown in FIG. 17B.

  FIG. 18 shows a configuration of a magneto-optical head in which a magnetic core 102c is provided on a portion of a laser beam transmitting member 106 of the floating type magneto-optical head of FIG. In the floating type magneto-optical head of FIG. 18, a magnetic core 102c is provided between the solid image lens 100 and the magneto-optical recording medium 130 and inside the magnetic coil 104. The magnetic core 102c is made of the same magnetic material that transmits laser light as shown in FIG. With this configuration, the floating type magneto-optical head can reduce the spot diameter on the magneto-optical recording medium 130 and stably and easily control the magnetic field applied to the magneto-optical recording medium 130.

  Further, FIG. 19 shows a case where at least a portion of the solid-state image lens 100 in the configuration of the flying type magneto-optical head of FIG. 17 is made of a magnetic material that transmits laser light, for example, a transparent ferrite. In the solid immersion lens 100, only a portion 100c near the center orthogonal to the emission surface 100a of the irradiated laser beam is formed of a magnetic material. According to this configuration, the magnetic core 102c is not required in the magneto-optical head of FIG. 15 or FIG. By using such a solid-state image lens 100, the distance between the magneto-optical recording medium 130 and the magnetic coil 104 can be reduced, so that the accuracy of determining the position of the external magnetic field can be further improved and the configuration of the magneto-optical head can be simplified. Can be. Such a solid imagery lens 100 is formed by first polishing a glass to form a lens part having an opening formed in the center of a hemispherical glass, and then forming a magnetic material in the opening by a sputter or vapor deposition method. Can be formed.

  FIG. 20 shows an embodiment of a magneto-optical recording / reproducing device using a solid image lens 100 having a floating slider as a magneto-optical head. FIG. 20 shows the magneto-optical recording disk 51 and the entire magneto-optical head. The objective lens 71 is attached to an objective lens driving device not shown, and the objective lens driving device, the solid immersion lens 100, the slider 102, the magnetic coil 104, and the mirror 69 are integrated to form a magneto-optical head 53b. ing. The magneto-optical head 53b is installed and fixed at the tip of the swing arm of the magneto-optical recording / reproducing apparatus. The magneto-optical head according to the seventeenth embodiment uses notches 102 s and 100 s formed on a part of the sliding surface of the slider 102 and a part of the sliding surface of the solid image lens 100, respectively. Floating grooves for floating the magneto-optical head are formed in the notches 102s and 100s. The other configuration of the magneto-optical recording / reproducing apparatus is the same as that of the fifth embodiment and the sixth embodiment.

  FIG. 21 is a view showing the floating arm for floating the swing arm magneto-optical head formed on the sliding surface of the slider 102 of the magneto-optical head mounted and fixed at the tip of the swing arm 56 of the magneto-optical recording / reproducing apparatus. The shape of the groove. FIG. 21 shows a slider section 161 of the slider 102, a tapered portion 160, and a position where the solid image lens 100 is installed. The other configuration of the magneto-optical recording / reproducing apparatus is the same as that of the fifth embodiment and the sixth embodiment.

FIG. 11 is a cross-sectional view of a conventional magneto-optical recording / reproducing apparatus head configuration. FIG. 11 is a sectional view of a head configuration of a conventional magneto-optical recording / reproducing apparatus. 1 is a plan view of an embodiment of a magneto-optical recording / reproducing apparatus according to the present invention. FIG. 4 is an embodiment diagram of an optical system according to the present invention. 1 is a plan view of an embodiment of a magneto-optical recording / reproducing apparatus according to the present invention. FIG. 4 is an embodiment diagram of an optical system according to the present invention. 1 is a side view of an embodiment of a magneto-optical recording / reproducing apparatus according to the present invention. 1 is a plan view of an embodiment of a magneto-optical recording / reproducing apparatus according to the present invention. FIG. 4 is an embodiment diagram of a magneto-optical recording pre-pit pattern according to the present invention. FIG. 3 is a diagram showing an embodiment of a magneto-optical disk cartridge according to the present invention. 1 is a perspective view of an embodiment of a magneto-optical recording / reproducing apparatus according to the present invention. FIG. 3 is a conceptual diagram illustrating the principle of increasing the number of optical elements used in a magneto-optical head according to the present invention. FIG. 13 is a cross-sectional view of a magneto-optical head including a solid immersion lens and a magnetic coil on a slider using a solid immersion lens for the optical element shown in FIG. 12, in a case where the solid immersion lens and the magnetic coil are built in the slider. It is shown. FIG. 13 is a sectional view of a magneto-optical head in which the solid immersion lens shown in FIG. 12 is mounted on a slider and a magnetic coil is built in the slider. FIG. 15 is a cross-sectional view of the magneto-optical head in a case where a magnetic material that transmits laser light is disposed in a portion where the solid immersion lens is provided in the magneto-optical head illustrated in FIG. 14. FIG. 15 is a cross-sectional view of the magneto-optical head shown in FIG. 14, in which a magnetic coil joined to an emission light surface of a solid immersion lens is disposed between optical recording media. FIG. 3 is an external perspective view of a film-shaped magnetic coil used for the magneto-optical head. FIG. 17 is a cross-sectional view of a magneto-optical head in which a magnetic core that transmits laser light is disposed at a portion where the solid immersion lens of the magneto-optical head shown in FIG. 16 is installed. FIG. 18 is a sectional view of the magneto-optical head in which a magnetic core transmitting laser light is formed in the magneto-optical head shown in FIG. 17 near a center orthogonal to a laser light emitting surface of the solid immersion lens. FIG. 2 is a sectional view of an embodiment of a magneto-optical head provided in the magneto-optical recording / reproducing apparatus of the present invention. FIG. 2 is a plan view of a slider embodiment of a magneto-optical head provided in the magneto-optical recording / reproducing apparatus of the present invention.

Explanation of reference numerals

51, 130 Magneto-optical disk 56, 73 Swing arm 53b Magneto-optical head 69 Mirror 71 Objective lens 71, 100 Solid immersion lens 14, 14a, 102 Slider 21, 104, 131, 132 Magnetic coil 101 Optical element 103 Recording medium

Claims (7)

A recording / reproducing apparatus comprising a head having at least a lens, wherein the lens is mounted on a head unit including a flying head slider having a laser light transmitting portion.
The head unit includes a magnetic coil,
A recording / reproducing apparatus, wherein the magnetic coil is provided on an outgoing light surface side of the lens.   2. The recording / reproducing apparatus according to claim 1, wherein the magnetic coil is a film-shaped coil.   2. The recording / reproducing apparatus according to claim 1, wherein the lens is a solid immersion lens.   2. The recording / reproducing apparatus according to claim 1, wherein at least a portion of the lens is made of a magnetic material that transmits laser light.   A swing arm unit comprising the head unit, the arm unit, and a signal detection system device for a disk recording medium, wherein a swing drive shaft is arranged near an outer periphery of the disk recording medium mounted on the recording / reproducing apparatus. 2. The recording / reproducing apparatus according to claim 1, wherein:   The head unit is fixedly installed at the tip of the balance-shaped swing arm having the fulcrum on the swing drive shaft on the disk recording medium side, and the other end of the balance-shaped swing arm detects a signal of the disk recording medium. 2. The recording / reproducing apparatus according to claim 1, wherein the system device is mounted and fixed. 2. The recording / reproducing apparatus according to claim 1, wherein a tracking signal is detected based on prepits embedded in the disk recording medium.

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