WO1997005607A1 - Substrat, support d'enregistrement comprenant ce substrat, cartouche et appareil de reproduction - Google Patents

Substrat, support d'enregistrement comprenant ce substrat, cartouche et appareil de reproduction Download PDF

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Publication number
WO1997005607A1
WO1997005607A1 PCT/JP1996/002157 JP9602157W WO9705607A1 WO 1997005607 A1 WO1997005607 A1 WO 1997005607A1 JP 9602157 W JP9602157 W JP 9602157W WO 9705607 A1 WO9705607 A1 WO 9705607A1
Authority
WO
WIPO (PCT)
Prior art keywords
recording medium
cartridge
substrate
disk
recording
Prior art date
Application number
PCT/JP1996/002157
Other languages
English (en)
Japanese (ja)
Inventor
Satoru Ohnuki
Norio Ohta
Katsusuke Shimazaki
Masafumi Yoshihiro
Toshinori Sugiyama
Takeshi Ohnuki
Original Assignee
Hitachi Maxell, Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Maxell, Ltd. filed Critical Hitachi Maxell, Ltd.
Publication of WO1997005607A1 publication Critical patent/WO1997005607A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/03—Containers for flat record carriers
    • G11B23/0301—Details
    • G11B23/0313—Container cases
    • G11B23/0316—Constructional details, e.g. shape
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/1058—Flying heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
    • G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
    • G11B11/10584—Record carriers characterised by the selection of the material or by the structure or form characterised by the form, e.g. comprising mechanical protection elements
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/03—Containers for flat record carriers
    • G11B23/0301—Details
    • G11B23/0307—Positioning or centering features

Definitions

  • the present invention is suitable for accommodating a recording medium substrate that is thin but has high rigidity and is suitable for high-density recording, an optical recording medium or a magnetic recording medium using the same, and those thin recording media.
  • the present invention relates to a recording medium and a reproducing apparatus suitable for reproducing or recording / reproducing a thin optical recording medium.
  • NA numerical aperture
  • spherical aberration is proportional to the fourth power of NA
  • coma is proportional to the cube of NA
  • astigmatism is proportional to the square of NA.
  • NA can be increased by reducing the thickness of the substrate of the optical recording medium (see T. SUGAYA et al., IS OM / ODS, 93 Diest, pp. 164 to 165).
  • a method using a thin substrate for example, a method in which two substrates having a thickness of 0.6 mm are laminated as one of the digital video disc standards has been proposed.
  • the most common magneto-optical recording method is currently used as the recording method for such a two-layered optical recording medium.
  • the optical magnetic field modulation recording method described in JP-A-11-229263 and the magnetic field modulation overwriting method put to practical use in MD and the like cannot be applied. It hinders speeding up.
  • the productivity of a two-layered board is low. Therefore, a single-substrate substrate having a small thickness for an optical recording medium is desired.
  • the thickness of a substrate used for an optical disk is about 1.2 mm.
  • the rigidity of the substrate is reduced.
  • the vertical oscillation (surface oscillation) and the tilt angle are particularly deteriorated, and it becomes difficult to record and reproduce the recording medium in a stable state.
  • the magnetic head is positioned at an interval of several tens of nm with respect to the magnetic disk.
  • Fig. 17 shows the cross-sectional structure of a conventional magneto-optical disk-tridge.
  • the drive unit has an automatic focus control mechanism for maintaining the optical head at a fixed distance from the information recording surface of the medium. Equipped.
  • a first object of the present invention is to provide a recording medium substrate suitable for high-density recording even though it is thin, and a recording medium such as an optical recording medium and a magnetic recording medium using the same. It is in.
  • a second object of the present invention is to provide a reproducing apparatus and a reproducing apparatus suitable for reproducing a thin recording medium.
  • An object of the present invention is to provide a recording and reproducing device.
  • a third object of the present invention is to provide a cartridge suitable for a thin recording medium having a function of holding a surface of a rotating thin recording medium at a predetermined position.
  • a portion corresponding to a recording region of the recording medium and a portion corresponding to a region outside the recording region are different.
  • a substrate for a recording medium wherein the substrates have different thicknesses.
  • the substrate thickness of the portion corresponding to the recording region of the recording medium is made different from the substrate thickness of the portion corresponding to the region outside the recording region. The rigidity of the whole substrate can be maintained even if the substrate thickness in the recording area is as thin as 0.85 mm or less, for example.
  • a portion corresponding to a recording region of the recording medium, a portion corresponding to a region outside the recording region, and a portion corresponding to a region inside the recording region are mutually different from each other on the substrate.
  • the thickness can be different.
  • a portion corresponding to a recording region of the recording medium is larger than a portion corresponding to a region inside the recording region.
  • a substrate for a recording medium, wherein the substrate has a large thickness is provided.
  • this recording medium substrate can maintain the rigidity of the entire substrate even if the substrate thickness of the recording area is reduced to 0.85 mm or less for higher density.
  • a reinforcing member having a Young's modulus equal to or higher than the Young's modulus of the substrate is fixed to at least a part of the substrate surface.
  • a substrate for a recording medium comprising:
  • the reinforcing member can be fixed to a portion corresponding to a region other than the recording region on the inner peripheral portion or the outer peripheral portion of the substrate.
  • the present invention provides a recording medium suitable for high-density recording manufactured using the substrate according to the first, second or third aspect of the present invention.
  • an optical recording medium or a magnetic recording medium using a plastic substrate is suitable.
  • a reproducing apparatus for an optical recording medium which irradiates a light beam onto the optical recording medium and detects a change in reflected light from the optical recording medium as a change in light amount.
  • an air gear forming member which forms an air gear having the same width during rotation with respect to the upper and lower surfaces of the optical recording medium.
  • the reproducing apparatus of the present invention uses a slider 66 a, 66 b, 66 c, 66 d as an air gear groove forming member for recording and reproducing with the disk 61 interposed therebetween. Provide near heads 65 and 67.
  • the sliders are arranged so as to form air gaps 68 a, 68 b, 68 c, 68 d of the same width between the upper surface and the lower surface (both are designed positions) of the disk (optical recording medium) 61. I do. If the position of the disk surface deviates from the designed position when the disk 61 is rotated, the air gap between the air gap 68 a (68 c) and the air gap 68 b (68 d) should be equalized. On top or bottom A lift is generated, and the lift forces the disk 61 to be restrained at an intermediate position between the sliders 66a and 66b (and the sliders 66c and 66d).
  • the air gap forming member is a pair of sliders opposed to each other with the optical recording medium interposed therebetween, and the pair of slider members is an optical head and a magnetic head of the reproducing apparatus. It is preferable that each of them is fixed to each of them. Further, it is preferable that the air gap forming member is disposed with respect to the optical recording medium such that the air gap is 0.5 mm or less.
  • the reproducing apparatus of the present invention is not limited to a reproducing-only optical recording medium, for example, a reproducing apparatus for an optical disk, and a recording / reproducing apparatus having a recording function for a write-once or rewritable optical recording medium, for example, a magneto-optical disk. It is a concept that also includes According to the fifth aspect of the present invention, at least in a recording medium power cartridge accommodating a disk-shaped recording medium having a substrate thickness of 0.85 mm or less in a signal recording area, a rotating circle A recording medium cartridge having a support means for supporting upper and lower surfaces of an outer peripheral portion of a plate-shaped recording medium is provided.
  • the force cartridge according to the present invention has an outer peripheral portion of a recording medium in order to stabilize the surface position of the recording medium by suppressing surface runout during rotation of a thin recording medium having a substrate thickness of 0.85 mm or less.
  • supporting means for supporting the upper and lower surfaces.
  • the outer peripheral portion of the medium may be a roller member rotatable with the rotation of the recording medium or a sliding member that slides on the upper and lower surfaces of the outer peripheral portion of the rotating disk-shaped recording medium.
  • the cartridge of the present invention preferably further includes dust collecting means for collecting dust or the like generated by contact between the roller-shaped member or the sliding member and the medium.
  • a convex portion for adjusting the flow of air during rotation of the recording medium is provided on the inner surface of the cartridge.
  • a recording medium cartridge is provided, wherein at least one of the concave portions is formed symmetrically on the upper surface and the lower surface of the inner surface of the force cartridge, respectively.
  • a convex portion or a concave portion for adjusting the flow of air when the recording medium rotates is formed symmetrically on the inner surface of the cartridge.
  • the convex or concave portion changes the flow velocity of the air flow flowing through the space between the convex or concave portion and the surface of the recording medium, and the change in the flow velocity causes a pressure fluctuation in the space.
  • the signal recording surface of the recording medium is subjected to a force from above or below the disc so that the fluctuating air pressure is equal on the upper and lower surfaces of the disc, whereby the signal recording surface is at a fixed position (height position). Will be maintained.
  • a laser beam is focused on a transparent substrate in a non-contact and remote manner, and recording / reproducing is performed on a recording medium, it is necessary to execute the autofocus function within an effective range.
  • the technique of the present invention for holding the signal recording surface of the disk at a fixed position by the air flow is effective.
  • the distance between the projection and the inner surface of the force cartridge is preferably 0.8 mm or less, and more preferably 0.6 mm or less.
  • a window for accessing a head for signal recording or reproduction is formed in the cartridge, and the protrusion is formed at least on an inlet side of the window recording medium. It is preferable that they are formed symmetrically on the upper surface and the lower surface inside the bridge.
  • the air pressure between the convex portion formed on the upper surface inside the cartridge and the upper surface of the recording medium and the air pressure between the convex portion formed on the lower surface inside the cartridge and the lower surface of the recording medium become equal.
  • the recording / reproducing area is positioned at an intermediate position between the two convex portions before recording / reproducing by the head.
  • a seventh aspect of the present invention in a recording medium cartridge accommodating a disc-shaped recording medium having a substrate thickness of 0.85 mm or less at least in a signal recording area, The distance between the lower surface of the recording medium and the inner lower surface of the cartridge is equal to the distance between the lower surface of the recording medium and the inner lower surface of the cartridge in the radial direction of the recording medium, and the distance between the upper surface of the recording medium and the inner upper surface of the force cartridge;
  • a force cartridge for a recording medium is provided, wherein the distance between the lower surface of the recording medium and the inner lower surface of the cartridge is smaller on the outer peripheral side than on the inner peripheral side of the recording medium.
  • the cartridge of the present invention similarly to the cartridge of the sixth aspect, equally rectifies the air flows above and below the recording medium during rotation of the recording medium, and particularly adjusts the surface position of the outer peripheral portion of the recording medium. It can be held in a fixed position.
  • FIG. 1 is a schematic view of an optical disk according to the present invention.
  • FIG. 2A is a sectional view of the carbonate substrate for manufacturing an optical disc shown in FIG. 2B to 2G are cross-sectional views showing various structures of the recording medium substrate of the present invention
  • FIG. 2H is a cross-sectional view showing the structure of a conventional recording medium substrate.
  • Fig. 3 is a graph showing the results of measurement of the amount of runout of the substrate having the cross-sectional structure shown in Figs. 2A, 2B, 2C, and 2H when rotating on a drive.
  • FIGS 4A to 4H are cross-sectional views showing another structure of the recording medium substrate according to the present invention.
  • 5A to 5G are sectional views showing still another structure of the recording medium substrate according to the present invention.
  • FIG. 6 is a principle diagram of the optical recording medium reproducing device according to the present invention.
  • FIG. 7 is a conceptual diagram showing an example of attaching the slider members 66b and 66d to the light head in the embodiment 2-11.
  • FIG. 8 is a conceptual diagram showing an example of attaching the slider members 66a and 66c to the magnetic head in the embodiment 2-1.
  • FIG. 9 is a schematic configuration diagram of an optical recording medium reproducing apparatus according to Embodiment 2-2.
  • FIG. 10 is a schematic configuration diagram of a recording medium cartridge of the present invention.
  • FIG. 11 is a partial cross-sectional view showing the structure of a mouthpiece member used in the recording medium cartridge of the present invention.
  • FIG. 12 is a partial cross-sectional view of a cartridge showing the structure of a liner used in the recording medium cartridge of the present invention.
  • FIG. 13 is a partial sectional view of the cartridge showing the structure of the dust collection chamber used in the recording medium cartridge of the present invention.
  • FIG. 14 is a partial cross-sectional view showing the structure of another roller member used for the recording medium power cartridge of the present invention.
  • FIG. 15 shows the structure of the sliding member used in the recording medium cartridge of the present invention. It is a fragmentary sectional view showing structure.
  • FIG. 16 is a graph illustrating the effect of the cartridge according to the third embodiment of the present invention.
  • FIG. 17 is a sectional view showing the structure of a conventional magneto-optical disk drive.
  • FIGS. 18 and 18 are a plan view and a sectional view taken along line AA, respectively, showing the structure of a recording medium cartridge according to Embodiment 41 of the present invention.
  • FIGS. 19A and 19B are a plan view and a sectional view taken along line AA, respectively, showing the structure of a recording medium cartridge according to Embodiment 412 of the present invention.
  • FIGS. 2OA and 20B are a plan view and a cross-sectional view taken along line AA, respectively, showing the structure of the recording medium cartridge of Embodiments 4-13 of the present invention.
  • 20 is a sectional view showing a modification of the sectional structure of FIG. 20B.
  • FIG. 21 is a cross-sectional view showing a structure of a force cartridge according to Example 4-4 of the present invention.
  • FIGS. 22A and 22B are a plan view and a sectional view taken along line AA, respectively, showing the structure of a recording medium cartridge according to Examples 4-5 of the present invention.
  • FIG. 1 is a schematic view of an optical disk according to the present invention.
  • the outer and inner diameters of the optical disc 1 are 120 mm and 15 mm, respectively.
  • the portion where information is not recorded / reproduced that is, the substrate thickness of the inner area 16 (the clamping area) of the lead-in 2 and the outer area 12 of the lead-out 4 is 1.2 mm.
  • the substrate thickness of the in 2 and the lead out 4 and the program area 14 sandwiched between them is 0.6 mm.
  • the portion connecting the lead-in 2 to the inner region 16, that is, the side wall portion of the inner region 16 is formed at about 20 ° so that a plastic substrate having good shape, optical properties and mechanical properties can be easily manufactured by injection molding. It is inclined.
  • the portion connecting the lead-out 4 to the outer region 12, that is, the side wall portion of the outer region 16 is also inclined at about 20 °. This inclination angle is preferably 450 or less.
  • the optical recording medium of the present invention can cope with high-density recording by making the recording / reproducing area thinner, and at least the outer peripheral portion where recording / reproducing is not performed.
  • the optical disk shown in FIG. 1 is obtained by, for example, injection molding a polycarbonate resin into a mold as shown in FIG. 1 in a mold equipped with a stamper on which a preform mat pattern is formed, and forming the mold on the obtained polycarbonate substrate. It can be manufactured by sequentially laminating a metal reflective film and a protective layer on the substrate.
  • FIG. 2A shows a cross-sectional view of the polycarbonate substrate 10 used for manufacturing the optical disc 1 of FIG.
  • FIG. 2A The cross-sectional view in Figure 2A is exaggerated to clarify the position of the inner region 16a and the outer region 12a, and the difference in thickness between those regions and the region 14a where recording and reproduction are performed.
  • FIG. 2B to 2G show modified examples of the cross-sectional structure of the optical recording medium substrate of the present invention.
  • Fig. 2B shows a case where only the thickness of the outer region 12b is larger than the thickness of the inner region 16b and the recording / reproducing region 14b compared to the case of Fig. 2A, and the thickness of the outer region 12b is 1.
  • the thickness of the area 14b where recording and reproduction are performed and the inner area 16mm are 0.6 mm.
  • FIG. 2C shows a case where the thickness of the inner area 16c is smaller than the thickness of the outer area 12c and the area of the recording / reproducing area 14c, and the thickness of the inner area 16b is 0.3 mm.
  • the thickness of the area 14b where recording and reproduction are performed and the outer area 1213 are 0.6 mm.
  • Figure 2D shows the case where the thickness of the outer area 12d is smaller than the thickness of the inner area 16d and the recording area 14d.
  • the thickness of the outer area 12d is 0.3 mm
  • the thickness of the region 14d to be performed and the inner region 16d is 0.6 mm.
  • FIG.2E shows a case where the thickness of the outer region 12e and the inner region 16e is smaller than the thickness of the recording / reproducing region 14e, and the thickness of the outer region 12e and the inner region 12e is 0.3 mm.
  • the thickness of the recording / reproducing area 14 e is 0.6 mm.
  • Figure 2F shows the case where the thickness of the outer area 12f, the inner area 16f, and the recording / reproducing area 14f are different from each other.
  • the thickness of the outer area 12f is 1.2 mm, and the thickness of the inner area 12f.
  • the thickness of the recording / reproducing area 14 f is 0.6 mm.
  • Figure 2G shows the case where the outer area 12 g, the inner area 16 g, and the recording / reproducing area 14 g have different thicknesses.
  • the outer area 12 g has a thickness of 0.3 mm and the inner area 12 g has a thickness of 12 g. Is 1.2 mm, and the thickness of the recording / reproducing area 14 g is 0.6 mm.
  • Figure 2H shows the cross-sectional structure of a conventional optical disk, where the disk thickness is 1. Shows the uniform case of 2 mm. 2A to 2G, the inclination angle at the step between the respective regions is 20 ° as in FIGS. 1 and 2A. The substrate having the cross-sectional structure shown in FIGS.
  • 2A to 2G can be easily manufactured by injection molding a resin such as polycarbonate using a mold having a shape corresponding to the cross-sectional structure. . It should be noted that either the upper surface or the lower surface of the substrate shown in FIGS. 2A to 2G may constitute the signal surface, and during the injection molding, the bit of the preformat pattern is formed on the desired surface by using a stamper. Groups can be formed. Next, with respect to the substrate having the cross-sectional structure shown in FIGS. 2A, 2B, and 2C, the amount of surface runout during rotation on the drive was measured.
  • the amount of runout was measured using an optical disk mechanical property measurement device (LM-1200, manufactured by Ono Sokki Co., Ltd.) during one rotation of the optical disk at a rotation speed of 180 O rpm (0 to 360.). Of the disk surface was examined. The results are shown in Figure 3. In the figure, curves A, B, and C show the measurement results for the substrates shown in FIGS. A, 2B, and 2C, and curve P shows the results for the conventional substrate shown in FIG. 2H. From FIG. 3, it can be seen that the substrate of the present invention has an extremely small surface runout. Although the optical disc substrate according to the present invention shown in FIGS. 2A to 2G has a thin recording / reproducing area as thin as 0.6 mm, the thickness of other areas is different.
  • LM-1200 manufactured by Ono Sokki Co., Ltd.
  • the rigidity of the substrate can be improved as compared with that of the substrate. Therefore, the optical recording medium and the magnetic recording medium manufactured by using the recording medium substrate of the present invention can reduce the deformation of the substrate during the rotation of the disk, thereby enabling good recording and reproduction.
  • the structures shown in FIGS. 2A, 28 and 20 are particularly preferable.
  • Example 11 4A to 4H show another sectional structure of the recording medium substrate according to the present invention. In FIGS. 2A to 2G, the thickness was changed by adjusting the height of at least one of the outer region 12, the recording / reproducing region 14, and the inner region 16 on the upper surface of the optical disc. As shown in FIGS.
  • each region can be changed so that the upper surface and the lower surface of the optical disc are symmetrical. Even when such a structure is employed, a predetermined level of rigidity of the thin substrate can be maintained as in the case of the embodiment 11.
  • FIG. 5A shows another configuration example of the substrate for a recording medium of the present invention.
  • the substrate 50 has an annular rigid reinforcing member 5 2 concentric with the substrate 54 in an outer region 12 on the upper surface of a flat optical disk substrate for an optical disk having a thickness of 0.6 mm and a diameter of 120 mm. a is fixed by an adhesive or the like.
  • the thickness of the rigid reinforcing member 52a can be adjusted so that the total thickness of the disk where the rigid reinforcing member 52a is mounted is about 1.2 mm. It is preferable that the side wall on the inner side of the disc of the rigidity reinforcing member is inclined at 45 ° or less similarly to the optical disc substrate of the embodiment 11.
  • the same material as that of the substrate such as a bolt-on-bottle, aluminum, iron, aluminum oxide, silicon oxide, titanium oxide, silicon nitride, titanium nitride, silicon carbide and the like are suitable.
  • a material having a higher Young's modulus than the material of the substrate it is preferable to use a material having a higher Young's modulus than the material of the substrate.
  • 5B to 5G show modified examples of the substrate of FIG. 5A.
  • an annular rigid reinforcing member 52 b concentric with the substrate 54 is fixed to an inner region 16 on the upper surface of the optical disk substrate 54 with an adhesive or the like.
  • FIG. 5B an annular rigid reinforcing member 52 b concentric with the substrate 54 is fixed to an inner region 16 on the upper surface of the optical disk substrate 54 with an adhesive or the like.
  • annular rigid reinforcing members 52c and 52c ' are respectively fixed by an adhesive or the like.
  • annular rigid reinforcing members 52 d and 52 d concentric with the substrate 54 are respectively fixed to the outer regions 12 on the upper and lower surfaces of the optical disk substrate 54 by an adhesive or the like. I have.
  • an annular rigid reinforcing member 52 e concentric with the substrate 54 is fixed to the inner region 16 on the upper and lower surfaces of the optical disk substrate 54 by an adhesive or the like.
  • FIG. 5E an annular rigid reinforcing member 52 e concentric with the substrate 54 is fixed to the inner region 16 on the upper and lower surfaces of the optical disk substrate 54 by an adhesive or the like.
  • FIG. 5G shows an example of a substrate in which the outermost periphery of the substrate of FIG. 5B is made of a vibration absorbing material 56.
  • the vibration absorbing material include elastic materials such as urethane, silicon resin, rubber materials such as vinyl chloride and butyl rubber, and various polymer materials.
  • the substrate structure shown in FIG. 5G is effective for a recording medium accommodated in a force cartridge of Example 3 described later.
  • the vibration absorbing material is attached to the rigid reinforcing member 52 and the inner area 16 used in each of FIGS. 5A to 5F in various shapes and arrangements to prevent various vibration modes. It is possible to cause vibration.
  • an optimal configuration can be obtained by selecting the shape of the substrate shown in each of FIGS. 2 and 4 by combining the elastic modulus and shape of the vibration absorbing material. 5B to 5G, the material of the reinforcing member 52 and the material and thickness of the substrate 54 are the same as those in FIG. 5A.
  • the rigidity of the substrate 54 is improved by fixing the rigidity reinforcing member 52 to an area other than the area where recording and reproduction are performed. can do.
  • the amount of surface runout during rotation of the substrates was measured in the same manner as in Example 11-11.
  • the substrates of FIGS. 5A to 5G suppressed the surface vibration. Accordingly, when an optical recording medium such as an optical disk or a magneto-optical recording medium manufactured from such a substrate is mounted on a drive and driven to rotate, the surface vibration of the disk surface can be reduced.
  • various optical recording media can be manufactured by a method generally used according to the type of the optical recording medium.
  • the optical disk in the case of an optical disk such as a CD, can be manufactured by applying a reflective layer and a protective layer on the substrate manufactured in the embodiment.
  • a magneto-optical disk it can be manufactured by laminating an enhancement layer, a recording layer, an intermediate layer, a metal layer, and the like on the substrate manufactured in the embodiment in various orders by sputtering or the like.
  • Embodiments 11 to 11 have been described by taking an optical disk and an optical disk substrate as examples, but the present invention can also be applied to a magnetic disk using a plastic substrate. For example, it is particularly effective to apply the present invention to a magnetic disk using an embossed plastic substrate as described in Japanese Patent Application Laid-Open No. 2-218010.
  • the dimensions of the plastic substrate for the magnetic disk can be, for example, an outer diameter of 95 mm, an inner diameter of 25 mm, and a thickness of 1.2 mm.
  • the material of the substrate is not particularly limited.
  • a material such as amorphous polyolefin can be used.
  • FIG. 6 is a diagram conceptually showing a portion near an optical head when the reproducing apparatus for an optical recording medium of the present invention is applied to a magneto-optical disk recording / reproducing apparatus.
  • This magneto-optical disk recording / reproducing apparatus like a normal magneto-optical disk recording / reproducing apparatus, has a magnetic head 65 and an optical head on the upper and lower sides of the magneto-optical disk 61 during recording and reproduction, respectively.
  • the optical head 67 has a built-in autofocusing mechanism 64 for moving the objective lens 62 closer to or away from the surface of the magneto-optical disk 61 using permanent magnets 63a and 63b. Can be done.
  • the reproducing apparatus for a recording medium according to the present invention opposes the front side and the rear side of the magnetic head 65 and the optical head 67 with respect to the illustrated moving direction of the disk so as to sandwich the disk 61 therebetween.
  • the two sets of slider members 66a, 66b and 66c, 66d are arranged.
  • Each of the slider members 66a, 66b and 66c, 66d is formed by processing a rectangular parallelepiped member into a shape such that opposing corners have different inclinations or curvatures, as shown in the drawing.
  • the slider members 66a, 66b and 66c, 66d vertically symmetrically with respect to the magneto-optical disk 61 as shown in Fig. 6, the slider members 66a, 66b 3 Air gaps 68a, 68b, 68c, 6 at the same interval between 66c, 66d and the upper and lower surfaces of the magneto-optical disk. 8 d can be formed.
  • the disk inlet side space in the disk moving direction front side
  • the disk outlet disk moving direction
  • the air gap is formed at a wider interval than the space on the rear side.
  • the air gap 68a and the air gap 68 Since the air pressures in b differ, forces (lift) act on the upper and lower surfaces of the disk to equalize the air pressures of those air gaps.
  • the lift allows the disk surface to be positioned at the design position. Therefore, even when the disk becomes thin, the surface position thereof can be automatically held by the air gap forming member during rotation, and the disk surface of the thin disk is prevented from contacting the inner wall of the cartridge.
  • the disk 61 is automatically positioned at an intermediate position between the slider members 66c and 66d during rotation.
  • the position of the slider member is determined by adding a half of the thickness of the disk to the position where the middle position of the opposing slider member is a predetermined distance from the height of the spindle that rotates the disk, that is, the disk installation reference height. It is preferable to design so that it is located at the right position.
  • the slider member is fixed at a predetermined position by being fixed to the magnetic head 65 and the optical head 67 as in a specific example described later. Can be placed on the table.
  • FIGS. 7 and 8 show examples of attaching the slider members 66a, 66b, 66c: 66d shown in FIG. 6 to the magneto-optical disk reproducing device.
  • FIG. 7 shows the slider member 66 b and 66 d forming the air gap 68 b and 68 d on the lower surface side of the disk 61, and the optical head 67 mounted on the support 70 of the optical head 67. It is a perspective view.
  • the slider members 66b and 66d were manufactured by processing a ceramic member having a length of 3 cm, a width of 8 mm, and a height of 8 mm so as to have a sectional shape as shown in FIG.
  • FIG. 8 shows a magnetic head 67 in which slider members 66 a and 66 c forming air gaps 68 a and 68 c on the upper surface side of the disk 61 are mounted on a support 69 of the magnetic head 65. It is a perspective view.
  • the slider members 66a and 66c were arranged parallel to each other at positions 2 cm away from the center of the magnetic head 65 with the magnetic head 65 interposed therebetween.
  • the slider members 66a and 66c are ceramic members having the same dimensions and shape as the slider members 66b and 66d.
  • the optical head 67 equipped with the slider members 66b and 66d shown in FIG. 7 and the magnetic head 67 equipped with the slider members 66a and 66c shown in FIG. 0.1mm air gap is incorporated into the magneto-optical disc recording / reproducing device to form I do.
  • the magnetic head 67 itself was made movable by an actuator (not shown) so that it could be retracted upward when a disk was attached or detached.
  • a magneto-optical disk having a substrate thickness of 0.6 mm is mounted on the magneto-optical disk recording / reproducing apparatus, and the magneto-optical disk can be driven at, for example, a rotation speed of 3600 rpm to record / reproduce data. As a result, the stability of the focus servo can be increased.
  • the slider members 66a, 66b, 66c, and 66d are not fixed to the optical head 67 and the magnetic head 65, and the head of the main body of the magneto-optical disk recording / reproducing apparatus is accessed.
  • the following shows an example of mounting on the fixed part of Linear Work.
  • the slider members 66 a, 66 b, 66 c, and 66 d are arranged so as to sandwich the outermost peripheral portion of the magneto-optical disk 61.
  • a predetermined position based on the height of a spindle that is, (the installation height of the magneto-optical disk 61 on the recording / reproducing apparatus) + (the thickness of the magneto-optical disk 61 X0.5)
  • the slider members 66a, 66b, 66c, 66d were positioned so that an air gap of 0.1 mm was formed in the vertical direction at each height (position).
  • the slider members 66a, 66b, 66c, and 66d are connected to the loading module or electromagnetic actuator by connecting them to the upper surface (the surface opposite to the surface facing the disk). Can be retracted upward and downward when the disc is attached or detached.
  • each slider member After the disk is rotated, each slider member can be brought close to the disk by a loading mode or the like to a distance that gives a gap of 0.1 mm on the upper and lower surfaces of the disk.
  • a loading mode or the like As in the case of Embodiment 2-1, since the disk surface is positioned at the intermediate position of the slider member by air gap, Even if the disk itself has a deformation such as distortion during molding, it is corrected at the time of recording / reproduction, that is, the vertical fluctuation of the rotating disk is suppressed. Therefore, recording and reproduction can be reliably performed even with a thin recording medium, and the stability of the focus servo can be increased.
  • a magneto-optical disk and its recording / reproducing apparatus have been described as examples of the optical recording medium.
  • the present invention is not limited to this, and can be applied to various optical recording media such as CD, CD-R, DVD, and MD. Further, the material, shape, arrangement, and the like of the slider member described in the embodiment are not limited to those specific examples, and any member may be used as long as it has the function and effect of the air gap forming member according to the principle description. Can be used in any position.
  • Third embodiment
  • FIG. Example 3 1
  • FIG. 10 shows a schematic configuration of a force cartridge when the force cartridge of the present invention is applied to a magneto-optical disk cartridge.
  • the magneto-optical disk drive 100 has a cartridge main body 101 composed of an upper shell 101a and a lower shell 101b, and a magneto-optical disk 103 housed therein.
  • the upper shell consists mainly of a shirt that opens and closes a shutter window of 106 la.
  • As the magneto-optical disk 103 a thin disk having a substrate thickness of 0.6 mm and an outer diameter of 120 mm is used.
  • roller members 105a and 105b In order to suppress deformation of the thin disk by supporting the upper and lower surfaces of the outer periphery of the rotating magneto-optical disk 103, roller members 105a and 105b, which will be described later, are driven by the force cartridge body.
  • the shirts in 101 are located on both sides of the evening window 106.
  • the magneto-optical head (not shown) for recording and reproduction approaches the area of the window 106, the position of the portion where the recording or reproduction is performed on the disk 103 is changed.
  • a liner for wiping off any abrasion powder generated by contact between the mouthpiece members 105a, 105b and the magneto-optical disk 103 is provided inside the cartridge body 101.
  • One 120a is provided on the side opposite to the roller member 105b with respect to the center of the disk.
  • the liners 120a and 120b slide on the disk surface by the rotation of the disk 103 and serve as means for supporting the upper and lower surfaces of the outer periphery of the rotating magneto-optical disk. Also works.
  • the structure of the liner 120a and the positional relationship with the disk 103 will be described later with reference to FIG.
  • FIG. 11 is a cross-sectional view of the force cartridge when the cartridge 100 shown in FIG.
  • the 10 is broken along a line connecting the center of the disk and the center of the roller member 105a.
  • the disc 103 is rotatably supported by a clamping plate 104.
  • the disk 103 is attracted to the spindle 114 of the magneto-optical disk reproducing device and is driven by the rotation of the motor shaft 109 when rotating.
  • the roller member 105a is a cylindrical roller, and the rotating shaft 107 is embedded at the center of the roller.
  • a groove 111 is formed on the outer periphery of the center of the roller.
  • roller groove 1 1 1 The upper and lower surfaces of the disk 103 are supported by being engaged with the outermost peripheral portion of the disk 103, that is, by supporting the upper and lower surfaces of the disk 103 by the roller grooves 111, so that the height direction of the surface of the disk 103 (rotating shaft Direction) can be suppressed.
  • the groove width of the roller member 105a was 0.7 mm with respect to the disk thickness of 0.6 mm. It is desirable that the groove width is set to be 0.05 to 0.15 mm wider than the disk thickness in order to ensure smooth rotation of the disk 105.
  • the bottom (depth) of the groove 111 is set to the disc in the cartridge body 101. It can be configured to be located outside the outermost design position of the.
  • the roller rotating shaft 107 has an end formed by a hole 1 formed inside the paper shell 101 a and the mouth shell 101 b of the power cartridge body 101. It is rotatably supported by 12a and 11b.
  • the material of the mouthpiece member 105a is preferably a material excellent in lubricity and abrasion resistance in order to reduce abrasion and frictional force caused by contact with the disc 103, such as polyacetal, polypropylene, and the like. Fluororesin is preferred.
  • the mouth member 103b has the same structure as the roller member 103a, and is made of the same material.
  • two roller members are provided in the cartridge body 101, but three or more roller members identical to the roller members 103a and 103b can be installed on the outer periphery of the disk. .
  • FIG. 12 is a partial cross-sectional view of the force cartridge in which the force cartridge main body 101 is broken by a line connecting the rotation center of the disc 103 and the center of the liner 120 in FIG.
  • Liner 1 2 0 a and 1 2 0 b are each Are fixed to the di-body 1 0
  • the liners 120a and 120b are provided so that the outermost peripheral portion of the disk is sandwiched between them, and the liners 120a and 120b are in contact with the roller members 105a and 105b and the disk 103.
  • the dust collecting chamber 130 provided in the force cartridge main body 101 of Fig. 10 will be described with reference to Fig. 13.
  • the dust collecting chamber 130 is a cartridge. This is a room formed in a corner of the main body 101, and an entrance 1 34 is provided on the outermost extension of the disk 103.
  • the entrance 1 3 4 of the dust collection chamber 130 has a wedge shape to prevent dust and the like collected in the dust collection chamber 130 from scattering again from there and adhering to the disc 103.
  • a silicon-based adhesive material 13 2 is applied to a part of the inner wall of the dust collection chamber 130, and the adhesive material 13 2 is a dust collection chamber 13 It sticks dust etc. that has entered 0.
  • an antistatic coating is applied to the inner wall of the force cartridge and the liners 120a, b.It is also effective to mold the cartridge with a resin mixed with the antistatic material.
  • FIG. 14 shows the force cartridge body 101 shown in Figs. An example in which different types of roller members are used will be described.
  • FIG. 14 is a sectional view of the force cartridge 100 shown in FIG. 10 cut at the same position as that of FIG.
  • the outermost periphery of the disc 103 is engaged by a pair of mouthpiece members 140a and 140b that respectively contact the upper and lower surfaces of the disc 103.
  • the shape of the mouthpiece members 140a and 140b can be cylindrical or barrel-shaped.
  • the roller rotating shafts 142a and 142b are rotatably supported by roller rotating shaft supporting members 146 formed inside the upper shell 101a and the lower shell 101b, respectively.
  • the distance between the roller member 140a and the mouth member 140b is the same as the groove width of the roller member shown in FIG.
  • the configuration of the disk 103 and other force cartridges is the same as in Example 3-1.
  • Example 3-3
  • FIG. 15 shows an example in which the sliding members 150a and 150b are used instead of the roller members in the force cartridge 100 shown in FIGS.
  • FIG. 15 shows a sectional view of the force cartridge 100 shown in FIG. 10 cut at the same position as that of FIG.
  • the outermost peripheral portion of the disk 103 is supported by a pair of hemispherical sliding members 150a and 150b that contact the upper and lower surfaces of the disk 103, respectively.
  • the coefficient of friction between the disk 103 and the sliding members 150a and 150b is preferably 0.3 or less, more preferably 0.2 or less.
  • the material of the sliding members 150a and 150b is desirably made of polyacetate, polypropylene, fluorine resin or the like in order to reduce the coefficient of friction and improve the activity and wear resistance. It is desirable that at least either the contact portion of the disk 103 with the sliding member or the sliding member itself be coated with a lubricant, for example, a silicon-based lubricant.
  • the sliding members 150a and 150b are upper It is mounted so as to face the end of the U-shaped support member 152 joined to the shell 101a and the lower shell 101b. The distance between the sliding member 150a and the sliding member 150b is the same as the groove width of the roller shown in FIG.
  • the configurations of the disc 103 and other force cartridges are the same as those of the embodiment 3-1 and the embodiment 2-2.
  • the force using the sliding members 150a and 150Ob also stabilizes the rotation of the thin disk by maintaining the position of the disk surface, thereby ensuring recording and reproduction. be able to.
  • the vertical run-out of the rotating disk surface was measured.
  • the same optical disk mechanical property measuring apparatus as used in Example 1 was used.
  • a conventional magneto-optical disk cartridge having no member for engaging the disk as shown in FIG. 17 was used. The results are shown in FIG. In Fig.
  • the measurement result of the force cartridge of Example 3-1 is curve 162
  • the measurement result of the cartridge of Example 3-3 is curve 163
  • the measurement result of the conventional force cartridge is curve 1.
  • the fluctuation (width of the runout) in one round of the disk was 0.5 mm at the maximum
  • Example 3-1 it was 0.12 mm at the maximum
  • Example 3-3 was the maximum. It was reduced to 0.13 mm.
  • the result of the force cartridge of Example 3-2 was not shown, a curve substantially equivalent to that of Example 3-1 was obtained, and the maximum surface runout was 0.11 mm.
  • the cartridge of the present invention is effective for a disk accommodated in the cartridge having an outer diameter of 80 mm or more and a disk substrate having a thinnest portion of 0.85 mm or less. 100 mm or more, -21-Effective when the minimum thickness of the disk substrate is 0.65 mm or less.
  • the cartridge accommodating the magneto-optical disk is described.
  • the type of the disk accommodated in the cartridge is not particularly limited, and may be a CD, a CD-ROM, a CD-R, a phase-change optical disk, an MD, and a DVD. And the like can be applied to various optical recording media.
  • the present invention can be applied to a magnetic disk using a plastic substrate, and is effective, for example, for a magnetic disk cartridge of a removable type.
  • the type of recording medium to be accommodated in the force cartridge is not particularly limited, and the cartridge of the present invention is applicable to any recording medium as long as the recording medium uses a thin substrate having a thickness of 0.85 mm or less. Can be. Fourth embodiment
  • the air flow during rotation of the disk is adjusted by providing a convex portion or a concave portion on the inner surface of the cartridge accommodating the recording medium, and the adjusted air flow adjusts the signal recording surface of the disk during recording and reproduction.
  • a cartridge for urging the cartridge to a certain height position will be described.
  • Fig. 18A is a plan view of a magneto-optical disk cartridge 181, in which a projection 1885a is provided radially from the center of the disk 181, which contains a magneto-optical disk 183. It is. In FIG. 18A, for convenience of explanation, the shape of the disk 183 accommodated in the cartridge 181, and the projection 1885a on the inner surface of the cartridge (upper shell) are seen through.
  • Fig. 18B shows a cross section of the force cartridge 18 1 taken along the line A-A in Fig. 18A.
  • Cartridge 1 8 1 is upper shell 1 8
  • FIG. 18A is a plan view of the upper shell 181a as viewed from above.
  • the upper shell 181a is formed with a shirt window 187 (not shown) so that the optical head can access the disk 183 during recording and reproduction.
  • the magneto-optical disk 183 having a diameter of 120 mm and a substrate thickness of 0.6 mm is housed in the force cartridge 181.
  • the inner surfaces of the upper shells 181a and 181b of the cartridge 181 respectively have strip-shaped convex portions 185a and 185b extending radially from the center of the disk. It is formed symmetrically with respect to 183.
  • the width of the convex portions 185a and 185b increases in a fan shape toward the outer side in the radial direction, and the heights of the convex portions 185a and 185b from the inner surfaces of the aperture shell 181a and the mouth shell 181b respectively.
  • 0.5 mm The distance between the convex portion 185a of the upper shell 181a and the upper surface of the disk 183 and the distance between the convex portion 185b of the mouth shell 181b and the lower surface of the disk 183 are preferably 0.8 mm or less, respectively, and more preferably. It is 0.6 mm or less, and in this embodiment, it is 0.5 mm.
  • the convex portions 185a and 185b are formed so as to have a divergence angle of 20 ° from the center of the disk, and are provided at 45 ° intervals on the circumference of the disk.
  • the convex portions 185a and 185b extend from the position of the radius of the disk 183 of 20 mm (the edge of the opening 189 for the clamping plate) to a position of a radius of up to 61 mm.
  • FIGS. 19A and 19B show modifications of the cartridges shown in FIGS. 18A and 18B.
  • the cartridge 1991 shown in Fig. 19A and its A-A cross-sectional view 19B is the upper shell 1991a and 1991b similarly to the cartridge 181 of the embodiment 4-11.
  • the cartridge 191 houses a magneto-optical disk 183 having a diameter of 120 mm and a substrate thickness of 0.6 mm.
  • the protrusions 1995a and 1995b are formed on the inner surface of the upper shell 19 la and the mouth shell 19 lb. It is formed radially so as to draw an arc 196 in the direction of rotation.
  • the arc 196 that defines the convex portions 195a and 195b is centered on the circumference (diameter of 120mm) of the disk and is drawn with a radius of 60mm. A total of 16 arcs were drawn with the center of arc 196 set at every 1/16 lap on the circumference of the disc.
  • the cross-sectional shape of the protrusion defined by the arc 196 has a saw-tooth shape as shown in Fig. 19B, protrudes at the position of the arc 196, and the space between the cartridge inner surface and the disk surface at that portion Is minimized, and the interval gradually increases until the next arc.
  • Example 4 a step is generated between the adjacent convex portions at the position of the arc 196, and the protruding height at the position of the arc c forming the boundary between the convex portions 195 is 0.5 mm,
  • the distance between the projections 195a, 195b and the surface of the disk 183 at that position is 0.5 mm as in the case of Example 4-1.
  • FIGS. 20A and 20B show modified examples of the force cartridge shown in FIGS. 19A and 19B.
  • FIG. 2 OA and its cartridge 201 shown in FIG. 20B which is a cross-sectional view taken along line A—A, are similar to the cartridge 191 of the embodiment 4-2, and have convex portions 205a and 205b. Are formed radially on the inner surface of the upper shell 210a and the mouth shell 201b so as to draw an arc in the rotation direction of the disk from the center of the disk toward the outer periphery. .
  • the cross-sectional shapes of the convex portions 205a and 205b are symmetrical to each other with respect to the disk 183, as shown in FIG.
  • FIGS. 20C and 20D similar to the cartridge 201 shown in FIGS. 20A and 20B, the convex portions are formed on the inner surface of the upper shell of the force cartridge and the inner shell.
  • the cross-sectional structure of a cartridge radially formed so as to draw an arc in the rotation direction of the disk from the center of the disk toward the outer periphery is shown.
  • the method of drawing the arc is the same as that described in Embodiment 4-2, but the cross-sectional shape of the convex (or concave) sectioned by the arc is different.
  • the center of the arc 206 is set every 1/16 of the circumference of the disk in the upper shell 201c and the lower shell 201d, but the circumference of the disk is set to 18 circumferences.
  • the convex portion 202a and the convex portion 202b were formed such that the arc portion drawn by the center of the arc set every time had the maximum height and the adjacent arc portion had the lowest height.
  • FIG. 20D in contrast to the case of FIG. 20B, on the inner surface of the x-ray shell 201 e and the mouth shell 201 f.
  • the arc portion 206 forms the concave portions 203 a and 203 b (the distance between the convex portion on the inner surface of the cartridge and the disk surface is preferably 0.8 mm or less, more preferably In the cartridges shown in FIGS. 20A to 20D, the height of the projection is 0.5 mm, and the distance between the disk and the projection is 0.5 mm.
  • the air flow generated in the circumferential direction of the disk by the rotation of the disk 183 can be reduced in the radial direction.
  • By increasing the pressure on the outer peripheral portion of the disk and applying the increased pressure evenly from the upper and lower surfaces of the disk it is possible to stabilize the surface position of the outer peripheral portion of the disk, which has particularly large fluctuations.
  • FIG. 21 shows a cross-sectional view of the force cartridge taken along a plane passing through the center axis of the disk 183.
  • the cartridge 210 accommodates, for example, a magneto-optical disk having a diameter of 120 mm and a substrate thickness of 0.6 mm.
  • the thicknesses of the upper shell 210 and the lower shell 210b constituting the force cartridge 210 are equivalent at the disk radial position, and gradually from the inner peripheral side to the outer peripheral side of the disk 183. It is thick.
  • a conical space is formed by the inner surface of the upper shell 210a and the upper surface of the disk, and similarly, a conical space is formed by the inner surface of the mouth shell 210b and the lower surface of the disk.
  • An interval is formed.
  • Example 21 can be used in combination with the structure shown in Example 41-1, 4-2 or 413 in which the projections (or depressions) on the inner surface of the cartridge are radially provided.
  • the stabilization of the surface position of the thin disk can be further improved.
  • Figure 22A shows a plan view of a force cartridge employing this structure
  • Figure 22B shows a cross-sectional view of the force cartridge taken along the line AA in the plan view of Figure 22A.
  • the cartridge 220 accommodates a magneto-optical disk 183 (not shown in FIG. 22A), and is formed by joining an aperture shell 220a and an aperture shell 220b.
  • a shutter window 187 is formed in the upper shell 220a so that the optical head can access when recording or reproducing the magneto-optical disk 183.
  • the magneto-optical disk 18 3 rotates in the direction from the edge 2 26 to the edge 2 25 out of the longitudinally opposite edges 2 2 5 and 2 2 6 which define the shirt evening window 18 7. .
  • the inner surface of the upper shell 220 a is an edge portion 2 25, 2 defining the shutter window 187.
  • the protrusion protruding toward the disc 183 near the edge 225 in the rotation direction (the arrow in the figure) of the disc 183 (the side of the disc enters the cartridge from the area of the window 187).
  • 222 a are formed, and a narrow air gear 228 a is formed between the disk 183 and the disk 183.
  • the inner surface of the mouth shell 2 20b forms a convex portion 222b which is symmetrical to the convex portion 222a of the upper shell 220a and the disk 183, and is formed between the convex portion 222b and the disk 183.
  • An air gap 228b is formed.
  • b was set to 0.5 mm each.
  • Such an air gap is at most 0.8 mm, more preferably at most 0.6 mm, in order to achieve the effects of the present invention.
  • the inner surface of the upper shell 220a has an edge 226 at the front of the rotating direction of the disk 183 (the disk surface exits from the area of the shutter window 187), and the inner surface of the upper shell 220a has the disk 18 3 Is formed, and the distance between the protrusion 22 la and the upper surface of the disk 183 is 0.5 mm, which is the same as that of the air gap.
  • Such an air gap is at most 0.8 mm, more preferably at most 0.6 mm, in order to achieve the effects of the present invention.
  • the wall thickness of the upper shell 220a becomes smaller toward the rear in the disk traveling direction from the convex portion 22la, and the distance between the inner surface of the upper shell 220a and the upper surface of the disk 183 gradually increases.
  • a convex portion 221b is formed symmetrically with the convex portion 221a of the upper shell 220a, and a 0.5 mm air gap is formed between the inner surface of the mouth shell 220b and the lower surface of the disk 183. are doing. So -n-As in the case of the inner surface of the upper shell 220a, the wall thickness of the lower shell 220b becomes thinner as it goes from the convex portion 221b to the rear in the disk traveling direction.
  • the projections 2 2 2 a, 2 2 2 b and 2 2 1 a, 2 2 1 b extend over the edges 2 2 5 and 2 2 6 of the shirt 1 8 7 Regardless of the position (in the radial direction of the disk) of the shutter window 187 where the optical head is located, stable recording / reproducing characteristics can be obtained by a disk surface position control operation described later.
  • the distance between the inner surface of the cartridge and the surface of the disk is narrower at the protruding portions 22a and 22b than at the other portions. The pressure due to the airflow can be increased.
  • the inner surface structure of the force ridge is made symmetrical with respect to the disk by the upper shell and the lower shell, and the disk surface has a convex portion formed on the inner surface of the upper shell and a convex portion formed on the inner surface of the mouth shell. In the middle point of, the increased air pressure is equal on the upper and lower sides of the disk.
  • the surface position is corrected when the disk 18 3 passes between the convex portions 222 a and 222 b.
  • Recording and playback are performed by scanning the disk surface with a light head in the area of the shirt window 187, so the pressure applied to the upper and lower surfaces of the disk before the shutter window 187 must be increased. Is desirable.
  • the pressure between the inner surface of the cartridge and the disk surface can be reduced to increase the pressure applied to the disk surface.
  • a disc having a substrate thickness of 0.6 mm was used as the disc 18 3.
  • the cartridge of the present invention has a substrate thickness of 0.85 mm or less, preferably 0.65 mm. Especially effective for disks thinner than mm. Further, as such a thin disk, a disk (recording medium) in which the substrate thickness described in the first embodiment is different between the recording area and other areas is preferable.
  • the cartridge structure of this embodiment can be used in combination with the structure of the embodiment 41-1, 412, 413 or 414, so that the position of the disk surface during recording or reproduction can be determined. It can be further stabilized.
  • Fourth Embodiment In the fourteenth to fourteenth and fifth embodiments the description has been made by taking the magneto-optical disk power storage as an example. Applicable to power cartridges.
  • the present invention can be effectively used not only for optical recording media but also for cartridges containing magnetic recording media whose substrates are made of plastic, for example, rim-bubble type magnetic disk cartridges.
  • the material and dimensions of the cartridge body are not particularly limited, and the cartridges currently used are not limited. Any material can be used, including the 3 ⁇ -di material.
  • the substrate for a recording medium of the present invention and a recording medium using the same are optical recording media for high-density recording, for example, CD, CD-Rs, CD-ROM, MD, DVD, MO, and rim-bubble type magnetic recording. It is effective for media, especially for thin high-density recording media with a substrate thickness of 0.85 mm or less.
  • the reproducing apparatus for an optical recording medium of the present invention includes an air gap forming member that acts to hold the surface position of the thin optical recording medium at a constant position, the thin optical recording medium can be stably used. Recording and reproduction can be performed in the state.
  • the cartridge of the present invention is suitable for accommodating a thin high-density recording medium, and can maintain a signal recording surface at a constant height during recording and reproduction.
  • the thickness of the cartridge can be further reduced, and a thin recording medium can be recorded and reproduced in a more stable state.

Landscapes

  • Magnetic Record Carriers (AREA)

Abstract

Une tête optique (67) et une tête magnétique (65) destinées à l'enregistrement et à la reproduction sur disque magnétooptique sont placées entre des patins (66a à 66d) qui servent à former des interstices étroits entre les têtes et un disque. Quand de l'air passe dans des directions tangentes aux pistes en raison de la rotation d'un disque (61), la pression dans l'interstice croît et la surface du disque peut être maintenue dans une position déterminée, de telle sorte que la pression dans la direction verticale du disque (61) devient uniforme. Cette conception est efficace pour un disque mince ayant un substrat dont l'épaisseur ne dépasse pas 0,85 mm. Une cartouche (101) à disque, efficace pour un disque mince, comprend un galet (111) qui se met en prise sur le pourtour du disque. La surface intérieure de la cartouche présente des protubérances radiales (157a et 157b) de manière à réguler le débit d'air entre la cartouche et la surface du disque. Le substrat (10) du disque, logé dans la cartouche, est plus épais à la périphérie (12) que la zone d'enregistrement (14), afin d'accroître la rigidité.
PCT/JP1996/002157 1995-08-01 1996-07-31 Substrat, support d'enregistrement comprenant ce substrat, cartouche et appareil de reproduction WO1997005607A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP21670695 1995-08-01
JP7/216706 1995-08-01

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Publication Number Publication Date
WO1997005607A1 true WO1997005607A1 (fr) 1997-02-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009110561A (ja) * 2007-10-26 2009-05-21 Konica Minolta Opto Inc 磁気記録媒体用基板

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5971434U (ja) * 1982-10-30 1984-05-15 ソニー株式会社 光学デイスク
JPS60261042A (ja) * 1984-06-06 1985-12-24 Matsushita Electric Ind Co Ltd 光学情報担体デイスク
JPS62293531A (ja) * 1986-06-12 1987-12-21 Canon Inc デイスク状記録媒体
JPH01264680A (ja) * 1988-04-15 1989-10-20 Hitachi Ltd 光ディスクカートリッジ
JPH05189828A (ja) * 1991-03-29 1993-07-30 Ricoh Co Ltd 光磁気記録装置
JPH05282826A (ja) * 1992-02-12 1993-10-29 Fujitsu Ltd 光ディスクカートリッジ
JPH05307769A (ja) * 1992-04-30 1993-11-19 Matsushita Electric Ind Co Ltd 光ディスク基板、光ディスク基板の製造装置および製造方法
JPH06176400A (ja) * 1992-09-29 1994-06-24 Sony Corp 光ディスク基板及びそれを用いた光ディスク

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5971434U (ja) * 1982-10-30 1984-05-15 ソニー株式会社 光学デイスク
JPS60261042A (ja) * 1984-06-06 1985-12-24 Matsushita Electric Ind Co Ltd 光学情報担体デイスク
JPS62293531A (ja) * 1986-06-12 1987-12-21 Canon Inc デイスク状記録媒体
JPH01264680A (ja) * 1988-04-15 1989-10-20 Hitachi Ltd 光ディスクカートリッジ
JPH05189828A (ja) * 1991-03-29 1993-07-30 Ricoh Co Ltd 光磁気記録装置
JPH05282826A (ja) * 1992-02-12 1993-10-29 Fujitsu Ltd 光ディスクカートリッジ
JPH05307769A (ja) * 1992-04-30 1993-11-19 Matsushita Electric Ind Co Ltd 光ディスク基板、光ディスク基板の製造装置および製造方法
JPH06176400A (ja) * 1992-09-29 1994-06-24 Sony Corp 光ディスク基板及びそれを用いた光ディスク

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009110561A (ja) * 2007-10-26 2009-05-21 Konica Minolta Opto Inc 磁気記録媒体用基板

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