JP2007080336A - Disk device and disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the surface wobbling of a flexible optical disk. <P>SOLUTION: For a surface along a disk (20) of a stabilizing member (30), a cross section on a first plane including a the rotary shaft of the disk and a moving line along which a head (26) on the optical disk moves is projected to the disk and a thinned part (30a) is formed on the disk rotating direction downstream side of the moving line. Thus, when rotating the disk at the rotation speed of ≥1,500 rpm for instance and recording and reproducing information, aerodynamic force acts on the disk by the stabilizing member and the surface wobbling near the moving line of the disk is suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk device and a disk cartridge, and more particularly to a disk device that performs at least one of recording and reproduction of information on a disk, and a disk cartridge that houses the disk.

  In recent years, with the start of digitalization of television broadcasts, there has been an increasing demand for higher density of information recorded on a disk as a recording medium with the digitization of information. The main measure for this requirement is to reduce the spot diameter of the laser beam used for recording or reproducing information.

In order to reduce the spot diameter of the laser light, it is effective to shorten the wavelength and increase the numerical aperture (NA) of the objective lens. As for the wavelength of the laser beam, conventionally, for example, near infrared light having a wavelength of about 780 nm is used for a CD (Compact Disk), and a DVD (Digital
For example, red light having a wavelength of about 650 nm is used for Versatile Disk, but in recent years, a semiconductor laser that oscillates blue-violet laser light has been developed, and laser light having a wavelength near 400 nm will be used in the future. Expected. As for the objective lens, the NA of the objective lens for CD is conventionally less than 0.5 and the NA of the objective lens for DVD is about 0.6. However, the NA tends to increase further in the future. is there.

  However, shortening the wavelength of light or increasing the NA of the objective lens leads to a reduction in the depth of focus of the optical system including the objective lens. For this reason, it is necessary to improve the focus servo accuracy. Further, when the NA of the objective lens increases, it is necessary to set the distance between the objective lens and the recording surface of the disc to be small, and therefore it is necessary to reduce the surface blur of the disc. The reason is that it is necessary to avoid a situation in which the pickup including the objective lens comes into contact with the disk immediately before starting the focus servo at the start.

  Against this background, the development of a disc with a recording surface formed on a flexible sheet (thin film) has been promoted. By rotating this disc on a stabilizing plate, surface blurring that occurs on the disc can be aerodynamic. A disk device that can be suppressed is proposed (for example, see Patent Document 1 and Non-Patent Document 1).

  The disc device described in Patent Document 1 includes a stabilizing member called a back plate formed by bending both ends of a circular plate. When recording or reproducing information on a disc, the disc device is provided with a back plate. It is intended to suppress surface blurring in the vicinity of the head by pressing against the recording surface of the rotating disk. In this method, the optical disc needs to perform a very specific bending operation following the bent portion defined by the flat surface forming the concave surface, and the bending operation may not be able to catch up as the rotation speed increases. is there.

  On the other hand, the disk device described in Non-Patent Document 1 includes a stabilizing plate called a saddle plate and a stabilizing member called a U-shaped stabilizer, and records or records information on the disk. When performing reproduction, the disk is rotated while being sandwiched between the gaps of the U-shaped stabilizer, and a negative pressure is applied using a saddle plate to reverse the disk to the disk device described in Patent Document 1 described above. By curving in the direction, the surface blur is selectively stabilized in a specific region within the gap. In this method, when the rotation speed is increased, the negative pressure generated by the saddle plate is lost to the centrifugal force acting on the disk, and the disk cannot be finally formed into a desired curved shape, and even in a specific region within the gap. There is an inconvenience that surface runout increases.

  Incidentally, Patent Document 1 describes that a stabilizing member having a concave surface (hereinafter also referred to as a continuous surface) that is continuously bent uniformly is not suitable for stabilizing a flexible optical disc medium. However, as a result of intensive studies, the inventors have found that this continuous surface effectively acts on the stabilization of the flexible disk in the region where the rotational speed exceeds 4000 rpm. Further, in the stabilization member having a simple continuous surface, the disc surface shake of the outer peripheral region (region other than the inner peripheral amount region) is larger than the inner peripheral region of the disc (for example, a circular region having a radius of 55 mm for a φ120 mm disc). It was found that the characteristics became unstable.

JP 57-33619 A “Optical Readout of Video Disc”, “EITA TRANSPORTATION ON CONSUMER ELECTRONICS”, November 1976, p. 304-308

  The present invention has been made under such circumstances, and a first object thereof is to suppress surface deflection of a flexible disk and to improve at least one of information reproduction accuracy and recording accuracy. It is to provide a disk device.

  A second object of the present invention is to provide a disc cartridge capable of suppressing surface deflection of a flexible disc.

  The invention according to claim 1 stabilizes the rotation of the head when moving along the recording surface of the flexible disk and when recording or reproducing information on the disk. A stabilizing member, wherein the stabilizing member has a cross section on a first surface including a rotation axis of the disk and a moving path of the head that is convex with respect to the disk. The disk device is characterized in that a cross section of a second surface that includes a rotation axis and is perpendicular to the first surface is concave with respect to the disk.

  According to this, the surface of the stabilizing member along the disk has a cross section on the first surface including the rotation axis of the disk and the flow line on which the head on the optical disk moves, and is convex with respect to the disk. A cross section in a plane perpendicular to the flow line is concave with respect to the disk.

  Therefore, for example, when information is recorded and reproduced by rotating the disc at a rotational speed of 1500 rpm or more, an aerodynamic force acts on the disc by the stabilizing member, and surface blurring near the flow line of the disc It is suppressed over the entire area from the inner periphery to the outer periphery, and as a result, it is possible to improve at least one of the reproduction accuracy and recording accuracy of information with respect to the disc.

  The invention according to claim 2 stabilizes rotation of the disk when performing recording or reproduction of information on the disk and a head that moves along a recording surface of the flexible disk. The stabilizing member includes a rotating shaft of the disk, and a cross section in a plane perpendicular to the moving path of the head is concave with respect to the disk, In this disk device, a meat stealing portion is formed at least in a portion corresponding to a region on the downstream side of the head and in the vicinity of the outer peripheral portion.

  According to this, the surface along the disk of the stabilizing member includes the rotation axis of the disk and the cross section at a surface perpendicular to the flow line of the head is concave with respect to the disk, and the downstream side of the flow line on the disk A meat stealing portion is formed in a region near the outer peripheral portion.

  Therefore, for example, when information is recorded and reproduced by rotating the disk at a rotational speed of 1500 rpm or more, an aerodynamic force is applied to the disk by the stabilizing member, and surface blurring in the vicinity of the flow line is caused by the inner peripheral portion. And the entire area from the outer periphery to the outer periphery, and as a result, it is possible to improve at least one of the reproduction accuracy and recording accuracy of information on the disc.

  In this case, the meat stealer can be an exhaust port as in the disk device according to claim 3.

  4. Each disk device according to claim 1, wherein, as in the disk device according to claim 4, a side wall portion surrounding the disk is provided on an outer periphery of the stabilizing member, and the side wall portion is The through-hole portion may be formed at a position corresponding to at least the downstream side of the head and the vicinity of the outer peripheral portion.

  According to a fifth aspect of the present invention, when performing either recording or reproduction of information while relatively moving the head along the recording surface of the casing, and a casing for rotatably accommodating a flexible disk. And a stabilizing member that stabilizes the rotation of the disk, wherein the stabilizing member has a cross section on a first surface including a rotation axis of the disk and a moving path of the head with respect to the disk. The disc cartridge has a convex shape, and a cross section of the second surface perpendicular to the first surface including a rotation axis of the disc is concave with respect to the disc.

  According to this, the surface of the stabilizing member along the disk has a cross section on the first surface including the rotation axis of the disk and the flow line on which the head on the optical disk moves, and is convex with respect to the disk. A cross section in a plane perpendicular to the flow line is concave with respect to the disk.

  Therefore, for example, when information is recorded and reproduced by rotating the disc at a rotational speed of 1500 rpm or more, an aerodynamic force acts on the disc by the stabilizing member, and surface blurring near the flow line of the disc It is suppressed in the entire region from the inner peripheral part to the outer peripheral part, and the disk surface can be reliably stabilized.

  According to a sixth aspect of the present invention, when performing either recording or reproduction of information while relatively moving a head along a recording surface of the casing, and a casing that rotatably accommodates a flexible disk. And a stabilizing member that stabilizes the rotation of the disk, wherein the stabilizing member includes a rotating shaft of the disk, and a cross section in a plane perpendicular to the moving path of the head is in the disk. In contrast, the disk cartridge is characterized in that it has a concave shape, and a meat stealing portion is formed at least on a portion of the disk corresponding to a region on the downstream side of the head and in the vicinity of the outer peripheral portion.

  According to this, the surface along the disk of the stabilizing member includes the rotation axis of the disk and the cross section of the surface perpendicular to the flow line of the head is concave with respect to the disk, and downstream of the flow line on the disk. On the side, a meat stealing portion is formed in a region near the outer peripheral portion.

  Therefore, for example, when information is recorded and reproduced by rotating the disk at a rotational speed of 1500 rpm or more, an aerodynamic force is applied to the disk by the stabilizing member, and surface blurring in the vicinity of the flow line is caused by the inner peripheral portion. It is suppressed in the entire region from the outer periphery to the outer periphery, and the disk surface can be reliably stabilized.

  In this case, as in the disc cartridge according to claim 7, the meat stealing portion can be an exhaust port.

  8. The disk cartridge according to claim 5, wherein, as in the disk cartridge according to claim 8, the casing has a through hole at a position on the disk corresponding to at least a region on the downstream side of the head and in the vicinity of the outer peripheral portion. The part can be formed.

  In each of the disk cartridges according to claims 5 to 8, like the disk cartridge according to claim 9, the casing may have a cylindrical side wall portion surrounding the disk.

<< First Embodiment >>
A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a schematic configuration of a disk device 100 according to the first embodiment.

  The disk device 100 is an optical disk device capable of recording and reproducing information with respect to the flexible optical disk 20. As shown in FIG. 1, the disk device 100 includes a motor 22 having a rotation shaft 22a parallel to the Z axis, a spindle shaft 24 fixed to the + Z side end of the rotation shaft 22a of the motor 22, and an optical disk 20. A pickup 26 that records and reproduces information, a stabilizing member 30 that stabilizes the rotation of the optical disc 20, a main body (housing) 10 that accommodates these parts, a control device (not shown) that controls the pickup 26 and the motor 22, and the like. I have.

  As shown in the plan view of FIG. 2, the optical disk 20 has a recording layer formed on the surface of a circular plate-like polycarbonate sheet 20a having a thickness of 100 μm, an outer diameter of 120 mm, and a circular hole formed in the center, for example. A filmed flexible optical disc is used.

In the recording layer, a groove having a stamper pitch of 0.6 μm and a width of 0.3 μm is first thermally transferred to a region 20b having an inner diameter of 50 mm to an outer diameter of 116 mm of the sheet 20a shown colored in FIG. Sequentially, a 120 nm thick Ag reflective layer, a 7 nm thick (ZrO ₂ —Y ₂ O ₃ ) —SiO ₂ layer, a 10 nm thick AgInSbTeGe layer, a 25 nm thick ZnS—SiO ₂ layer, and a 10 nm thick Si It is formed by depositing ₃ N ₄ layers.

  Further, on the front and back surfaces of the optical disc 20, a 10 μm thick transparent protective film formed by irradiating and curing the UV-coated spin resin with ultraviolet rays is formed to protect the recording layer and the disc substrate. For example, a circular plate 20c having a thickness of 0.3 mm, an outer diameter of 30 mm, and a circular hole having an inner diameter of 15 mm formed in the center is attached to the portion so that the center thereof coincides with the center of the sheet 20a.

  As can be seen from a combination of FIG. 1 and FIG. 3, which is a view of the stabilization member 30 as viewed from below, the stabilization member 30 is, for example, a high diameter of 125 mm with a circular opening having a diameter of 32 mm formed at the center. It is a low-profile columnar member, the surface on the + Z side is fixed to the ceiling surface of the housing 10, and the surface on the -Z side is a concave surface that applies aerodynamic force to the rotating optical disk (hereinafter also referred to as an operation surface). ). Here, for convenience of explanation, as shown in FIG. 3, an xy coordinate system having the origin at the center o of the surface on the −Z side of the stabilizing member 30 is defined.

  The working surface of the stabilizing member 30 has a generatrix that passes through the center of the working surface and is curved with a radius of curvature of 1000 mm, for example, as shown in FIG. A region defined by two straight lines parallel to the y-axis separated by a distance S (here, 35 mm) in the direction and the outer periphery of the working surface, that is, a colored region in FIG. 3, is a flat portion. . A pair of meat stealers 30a is formed in the vicinity of the position where the straight line L that forms an angle of 15 degrees with the y-axis and the outer periphery of the working surface overlap. As an example, the meat stealing portion 30a is a mortar that is recessed to the + Z side, as shown in FIG. 4 (A) and FIG. 4 (B), which is a view showing the AA ′ cross section of the stabilizing member 30 in FIG. It has a shape.

  Returning to FIG. 1, the spindle shaft 24 is a stepped cylindrical member having a cylindrical large-diameter portion and a small-diameter portion provided at the upper end of the large-diameter portion. The optical disc 20 is mounted on the spindle shaft 24 with the recording layer as the bottom surface by inserting the small diameter portion of the spindle shaft 24 into the round hole of the circular plate 20c and supporting it from below by the top surface of the large diameter portion. In this embodiment, as an example, the optical disc 20 is attached to the spindle shaft 24 so that the distance between the recording surface when the optical disc 20 is assumed to be flat and the flat portion of the stabilizing surface of the stabilizing member 30 is 150 μm. It shall be installed.

  The motor 22 drives the rotating shaft 22a to rotate the optical disc 20 through the spindle shaft 24 within a range of about 4000 to 14000 rpm, for example. The number of rotations of the optical disc 20 is controlled by a control device (not shown).

  The pickup 26 is disposed below the optical disk 20 (on the −Z side), and has a known configuration including a light source, an optical system including an objective lens, a light receiving element, and the like. The pickup 26 condenses laser light on the recording surface of the optical disk 20 rotated by the motor 22, receives reflected light from the recording surface, reads (reproduces) information from the optical disk 20, and reads information from the optical disk 20. Write (record). The pickup 26 is driven in the Y-axis direction along the radius of the optical disc 20 by a pickup driving device (not shown).

  Next, the operation of the stabilizing member 30 when information is recorded on and reproduced from the optical disk 20 by the disk device 100 configured as described above will be described. When the optical disc 20 rotates, the optical disc 20 is rebounded by a restoring force that tends to be horizontal due to the centrifugal force generated by the rotation, and a pressure difference acting on the upper and lower surfaces due to the surface shape of the optical disc 20. Force is generated. The stabilizing member 30 applies an aerodynamic force to the optical disk 20 and balances the restoring force and the repulsive force generated in the optical disk 20, so that the so-called surface wobbling of the optical disk 20 (vibration in the rotation direction of the disk 20). Is reduced.

  The inventors include a stabilization member 30 in which the pair of meat stealing portions 30a described above are formed, and a stabilization member in which the meat stealing portion is not formed (hereinafter referred to as a stabilization member 30 'for convenience). The stabilization experiment of the optical disk 20 was conducted using the optical disk 20. As shown in FIG. 5A, the stabilization experiment is performed in a state where the optical disk 20 is rotated in the direction indicated by the arrow b, the point P2 at the −Y side end of the outer periphery of the optical disk 20, and the outer periphery from the point P2. Amplitude in the Z-axis direction caused by surface deflection of the optical disc 20 observed at each position on the circumference of a central angle of 60 degrees defined by the points P1 and P3 located at −30 degrees and +30 degrees along Is to measure.

  First, when the stabilizing member 30 in FIG. 1 is replaced with a stabilizing member 30 ′, and the optical disk 20 is rotated at a predetermined rotational speed via the motor 22, the amplitude due to the surface shake generated on the outer peripheral portion of the disk 20 is increased. Measured. In this case, a force in a direction away from the stabilizing member 30 ′ acts on the optical disc 20 in the vicinity of the position P 2 on the downstream side (P 1 side) in the rotation direction of the optical disc 20. Therefore, the stabilizing member 30 ′ does not sufficiently act on this distant portion, and the surface blurring characteristic of the outer peripheral portion of the disk 20 becomes a curve indicated by a one-dot chain line in FIG.

  From this surface blur characteristic, it can be seen that the surface blur of the disk 20 locally increases near the downstream side in the rotational direction of the point P2, and the stabilizing member 30 'does not perform its function. Such a phenomenon is confirmed in the vicinity of 4000 rpm where the rotational speed of the optical disc 20 is not so fast, and the effect becomes significant when the rotational speed is in a high speed range exceeding 10,000 rpm. Therefore, as a result of intensive studies on this phenomenon, it is important to suppress the force that acts when the optical disk 20 rotates at a predetermined rotational speed or more and acts in the direction of pulling the optical disk 20 away from the stabilizing member. It came to.

  The stabilizing member 30 described above is adopted as a specific method derived from this conclusion. Similarly, in the stabilization experiment using the stabilizing member 30, as shown in FIG. 5A, the optical disk 20 is rotated in the direction indicated by the arrow b, and points P1, P2, The amplitude in the Z-axis direction due to surface wobbling of the optical disc 20 at each position on the circumference defined by P3 was measured. As described above, the stabilizing member 30 is formed with a pair of meat stealing portions 30a in the vicinity of the position of 15 degrees clockwise from the point where the y-axis and the outer periphery of the working surface intersect. For this reason, during the stabilization experiment of the stabilizing member 30 ′, the force acting in the direction of peeling off the optical disk 20 generated on the downstream side in the rotation direction near the point P2 is alleviated, and the surface blurring characteristic of the outer peripheral portion of the disk 20 is reduced. It became like the curve shown by the solid line in FIG. From this result, when the stabilizing member 30 is used, the surface blur characteristic is generally flatter than the curve indicated by the alternate long and short dash line in FIG. 5B, and in particular, the surface blur near the downstream side in the rotational direction of the point P2. It can be seen that is significantly improved.

  Further, the rotational speed of the optical disc 20 is changed stepwise from 4000 rpm to 14000 rpm in steps of 2000 rpm, and the point P4 at a position 25 mm away from the center of the optical disc 20 in the −y direction and the point P5 at a position 40 mm apart are separated by 58 mm. The amplitude of the optical disk 20 observed at the point P6 at the specified position was measured using a laser displacement meter. The following table 1 shows the measurement results when using the stabilizing member 30 ′, and the following table 2 shows the measurement results when using the stabilizing member 30.

  As shown in Table 1, when the stabilizing member 30 ′ is used, the amplitude observed at the points P4 and P5 is suppressed to within 10 μm at any number of rotations, but at the point P6. It can be seen that the observed amplitude rapidly increases beyond 15 μm. On the other hand, when the stabilizing member 30 is used, as shown in Table 2, it can be seen that the amplitudes observed at the points P4, P5, and P6 are suppressed within 10 μm at any number of rotations. .

  Therefore, when the stabilization member 30 according to the present embodiment is used as compared with the conventionally used stabilization member 30 ′, the flow line of the pickup 26 generated in the optical disc 20 (arrows a and a ′ in FIG. 2). It can be seen that the surface blurring in the vicinity of the line indicating the path along which the pickup 26 moves can be significantly reduced.

  As described above, according to the disk apparatus 100 according to the first embodiment, the optical disk 20 held on the spindle shaft 24 is rotated at a predetermined number of rotations by the motor 22 and is recorded on the recording layer 20b by the pickup 26. When the recording or reproduction is performed, the stabilizing member 30 effectively suppresses the surface blurring of the region where the recording layer 20b of the optical disc 20 is formed, for example, from a radius of 25 mm to a radius of 58 mm. It becomes possible to improve the reproduction accuracy and recording accuracy of information with respect to the optical disc 20.

  In the first embodiment, the case where a pair of meat stealing portions 30a is formed on the stabilizing member 30 has been described. However, the present invention is not limited to this, and instead of the meat stealing portion 30a, FIG. As shown, a stabilizing member 30A provided with an exhaust port 30b may be used. As shown in FIG. 6 (A) and FIG. 6 (B), which is a view showing the AA ′ cross section in FIG. 6 (A), the exhaust port 30b formed in the stabilization member 30A is stabilized. This is a through hole that passes from one side to the other side.

  When the stabilization experiment described above was performed using this stabilization member 30A, the measurement results shown in the following Table 3 were obtained.

  From the results shown in Table 3, even when the stabilizing member 30A is used, the amplitude due to the surface shake observed at the points P4 to P5 can be suppressed to 10 μm or less, and the case where the meat stealing portion 30a is provided. Similarly, it can be seen that the reproduction accuracy and recording accuracy of information on the optical disc 20 can be improved.

  Further, in place of the stabilizing member 30, as shown in FIG. 7A, two straight lines parallel to the y axis that are separated from the y axis in the + x direction by a distance S and + y from the x axis, as shown in FIG. A region defined by two straight lines parallel to the x-axis separated by a distance S in the direction, that is, a colored region in FIG. 7A is a flat portion, and the xZ section is concave with respect to the optical disc 20 Thus, a stabilizing member 30B having a convex shape with respect to the optical disc 20 may be used as shown in FIG. In this case, the working surface of the stabilizing member 30B is a complicated three-dimensional curved surface. However, the radius of curvature of the main element that determines the shape of the working surface of the stabilizing member 30B, for example, the concave curved portion of the xZ cross section is 1000 mm. Yes, the radius of curvature of the curved portion of the convex shape shown in FIG. 7B is 3000 mm.

  When the stabilization experiment described above was performed using this stabilization member 30B, the measurement results shown in the following Table 4 were obtained.

  From the results shown in Table 4, even when the stabilizing member 30B is used, the amplitude due to the surface shake observed at the points P4 to P5 can be suppressed to 10 μm or less, and the information reproduction accuracy for the optical disc 20 is similarly obtained. It can be seen that the recording accuracy can be improved.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described with reference to FIGS. Here, the same reference numerals are used for the same components as those in the first embodiment described above, and the description is simplified or omitted.

  FIG. 8 shows a schematic configuration of the disk device 100 according to the second embodiment. As shown in FIG. 8, the disk device 100 is detachably attached to a motor 22 having a rotating shaft 22a, a spindle shaft 24 fixed to the + Z side end of the rotating shaft 22a of the motor 22, and a holding member (not shown). A disc cartridge 40 that is held, a pickup 26 that records and reproduces information with respect to the optical disc 20 that is stored in the disc cartridge 40, a main body (housing) 10 that accommodates the above-described parts, a pickup 26, and a motor 22 that are not shown in the figure. Control device.

  For example, as shown in FIG. 8, the disk cartridge 40 includes a cover 42 and a base 44 that are engaged with each other, a stabilizing member 30 that is accommodated in an internal space formed by the cover 42 and the base 44, and An optical disc 20 is provided.

  The cover 42 has a square plate shape in plan view, and the upper surface of the stabilizing member 30 is fixed to the lower surface (the surface on the −Z side).

  As shown in FIG. 9, the base 44 is a square plate-like member, and a circular concave portion 44 c is formed in the center of the upper surface with a circular portion slightly larger than the optical disc 20 recessed downward (−Z direction). Yes. An inner bottom surface of the recess 44c is parallel to the XY plane, and a keyhole-shaped slot 45 having a longitudinal direction as the Y-axis direction is formed. The slot 45 has a shape in which a circular opening 45a and a rectangular opening 45b communicate with each other, and the opening 45a is formed so that the center thereof coincides with the center of the inner bottom surface of the recess 44c. 45b is formed to extend from the -Y side of the opening 45a to the inner wall surface of the recess 44c. Further, as shown in FIG. 9 and FIG. 10 which is a plan view of the base 44, the inner wall surface of the concave portion 44c can be seen from the + Y side end and the −Y side end of the inner wall surface of the concave portion 44c. A pair of exhaust passages 44 a are formed through the outer wall surface of the base 44 from positions that are shifted by about 15 degrees. The exhaust passage 42 has, for example, a square shape with a cross-sectional shape of 2 mm in length and 2 mm in width, and is formed so as to form an angle of 45 degrees with the Y axis.

  As shown in FIG. 8, in the base 44, the stabilizing member 30 fixed to the lower surface of the cover 42 and the optical disc 20 disposed below the stabilizing member 30 are accommodated in the recess 44c. In the state, it is fixed to the lower surface of the cover 42.

  When the disc cartridge 40 configured as described above is mounted on a holding member (not shown) of the disc device 100, the optical disc 20 accommodated therein is inserted into the slot 45 formed in the base 42 from below the cartridge 40. The spindle 26 is rotatably supported by the spindle shaft 24 inserted through the opening 45a, and the pickup 26 is accessible to the optical disc 20 through the opening 45b of the slot 45. The control device controls the motor 22 to rotationally drive the optical disc at a predetermined rotational speed, and moves the pickup 26 in the Y-axis direction along the opening 26b of the slot 45 via the pickup driving device. Information is reproduced or recorded on the recording layer.

  As described above, according to the disk cartridge 40 according to the second embodiment, when the optical disk 20 accommodated in the disk cartridge 40 is rotated at a predetermined rotation speed by the motor 22, the disk cartridge 40 is placed on the lower surface of the cover 40 of the disk cartridge 40. The fixed stabilizing member 30 effectively suppresses the surface shake of the area where the recording layer 20b of the optical disk 20 is formed (the area from the inner diameter 50 mm to the outer diameter 116 mm of the optical disk).

  In general, when a flexible disk is rotated in a closed space, there is a tendency for the disk to run out. However, the base 44 of the disk cartridge 40 has a meat formed on the stabilizing member 30. An exhaust passage 44a is provided to pass from the vicinity of the stealing portion 30a to the external space. For this reason, the air that has entered from the slot 45 of the base 44 due to the rotation of the optical disc 20 causes the stabilizing member 30 to generate a force for suppressing the surface shake on the optical disc 20, and then is quickly discharged from the exhaust passage 44a. . Therefore, although the optical disk 20 is accommodated inside the disk cartridge 40 which is a closed space, the surface blurring is effectively suppressed by the action of the stabilizing member 30, and the optical disk 20 can rotate stably. It has become.

  In the second embodiment, the case where the pair of meat stealing portions 30a is formed on the stabilizing member 30 has been described. However, as shown in FIG. 6A, instead of the meat stealing portion 30a. A stabilizing member 30A in which the exhaust port 30b is formed may be used.

  Further, as shown in FIG. 7A, the colored region is a flat portion, the cross section in a plane perpendicular to the yz plane including the x axis is concave with respect to the optical disc 20, and the y axis is A stabilizing member 30B having a convex shape with respect to the optical disc 20 may be used as shown in FIG.

  Note that the values of the outer diameter of the stabilizing member 30 and the radius of curvature of the working surface in each of the above embodiments are merely examples, and can be set to optimum values according to the disk used in the disk device 100. For example, if the outer diameter of the disc is reduced, the outer diameter of the stabilizing member 30 may be reduced accordingly. When a disc substrate having a thickness or material different from that of the optical disc 20 is used, for example, experiments or simulations are performed. Thus, the optimum shape of the stabilizing member may be determined.

  Moreover, as a stabilization member, it can manufacture by carrying out sheet metal processing of the injection molding of a plastic plate, for example, or a metal plate, for example.

  Moreover, although each said embodiment demonstrated the case where the stabilization member 30 was arrange | positioned above the optical disk 20, it may not be restricted to this but may be arrange | positioned below.

  Further, in each of the above embodiments, the surface blurring of the optical disk 20 is suppressed only by the stabilizing member 30 provided on one side of the optical disk 20, but the present invention is not limited to this, and in addition to the stabilizing member 30, FIG. As shown in FIG. 11 (A) and FIG. 11 (B), on the other side of the optical disk 20, there is an auxiliary stabilization having a working surface in a shape obtained by inverting the working surface of the stabilizing member 30 except for the meat stealing portion 30a and the like. The member 32 may be disposed.

  Further, in each of the above embodiments, when the optical disk 20 is stored in the disk cartridge 40, the exhaust passage 44a leading from the space in which the optical disk 20 is stored to the external space is provided. Even when the cartridge 40 is not used, when the optical disk 20 is rotationally driven in the closed space of the drive device 100, an air exhaust passage that leads from the closed space to the external space is provided, so that a surface caused by turbulent air flow is provided. The promotion of shaking can be suppressed. The closed space surrounding the optical disc 20 is preferably a space defined by a cylindrical inner wall surface along the outer periphery of the optical disc 20, for example.

  In each of the above embodiments, the case where the disk device 100 includes one pickup 26 has been described. However, the present invention is not limited to this. For example, in addition to the pickup 26, another pickup is disposed with the spindle shaft 24 interposed therebetween. May be. In this way, the disk device 100 can increase the transfer rate using, for example, two pickups.

  In each of the above embodiments, the case where the pair of meat stealing portions 30a and the exhaust ports 30b are provided has been described. However, the present invention is not limited thereto, and the meat stealing portion 30a or the exhaust port 30b is formed only near the pickup 26. May be. In short, it is sufficient that the optical disc 20 is prevented from being shaken in the vicinity of the pickup 26 and the pickup 26 can access the recording layer with high accuracy.

  In each of the above embodiments, the case where the flexible optical disk is stabilized by the stabilizing member 30 has been described. However, the present invention is not limited to this, and for example, a flexible disk such as a magnetic disk or a magneto-optical disk. Also suitable.

  As described above, the disk device 100 of the present invention is suitable for reproducing and recording information on a flexible disk, and the disk cartridge 40 of the present invention is a flexible disk. Suitable for storing.

1 is a diagram showing a schematic configuration of a disk device 100 according to a first embodiment of the present invention. It is a figure for demonstrating the optical disk 20 in FIG. It is a top view which shows the stabilization member 30 in FIG. 4A is a side view of the stabilization member 30, and FIG. 4B is a cross-sectional view of the stabilization member. FIG. 5A is a diagram illustrating the measurement position of the surface blur of the optical disc 20, and FIG. 5B is a diagram illustrating the surface blur characteristic of the optical disc 20. FIGS. 6A and 6B are views showing a first modification of the stabilization member 30. FIG. FIG. 7A and FIG. 7B are views showing a second modification of the stabilization member 30. It is a figure which shows schematic structure of the disc apparatus 100 concerning the 2nd Embodiment of this invention. FIG. 2 is a perspective view showing a base 44 of the disk cartridge 40 in FIG. 1. FIG. 2 is a plan view showing a base 44 of the disk cartridge 40 in FIG. 1. FIG. 11A is a diagram showing a modification of the disk device 100 according to the first embodiment, and FIG. 11B is a diagram showing a modification of the disk device 100 according to the second embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 20 ... Optical disk, 26 ... Pickup, 30, 30A, 30B ... Stabilizing member, 10 ... Main body (housing), 20a ... Sheet, 20b ... Area (recording layer), 24 ... Spindle shaft, 22 ... Motor, 22a ... Rotating shaft 32 ... auxiliary stabilizing member, 40 ... disc cartridge, 42 ... cover, 44 ... base, 44a ... exhaust passage, 44c ... recess, 45 ... slot, 45a, 45b ... opening

Claims (9)

A disc comprising: a head that moves along a recording surface of a flexible disc; and a stabilizing member that stabilizes the rotation of the disc when information is recorded or reproduced on the disc. In the device
The stabilization member has a first surface including a rotation axis of the disk and a moving path of the head, the cross section of which is convex with respect to the disk, and includes a rotation axis of the disk and perpendicular to the first surface. A disk device characterized in that a cross section on two surfaces is concave with respect to the disk. A disc comprising: a head that moves along a recording surface of a flexible disc; and a stabilizing member that stabilizes the rotation of the disc when information is recorded or reproduced on the disc. In the device
The stabilizing member includes a rotating shaft of the disk, and a cross section in a plane perpendicular to the moving path of the head is concave with respect to the disk, on the disk, at least on the downstream side of the head and in the vicinity of the outer peripheral portion. A disk device, wherein a meat stealing portion is formed in a portion corresponding to an area.   The disk apparatus according to claim 2, wherein the meat stealing unit is an exhaust port.   A side wall that surrounds the disk is provided on the outer periphery of the stabilization member, and a through hole is formed on the side wall at a position corresponding to at least the downstream side of the head and the vicinity of the outer periphery. The disk device according to claim 1, wherein the disk device is a disk device. A casing that rotatably accommodates a flexible disk, and the rotation of the disk is stabilized when information is recorded or reproduced while the head is relatively moved along the recording surface of the disk. A disc cartridge comprising a stabilizing member,
The stabilizing member has a first surface including a rotation axis of the disk and a moving path of the head, and a cross section is convex with respect to the disk, and includes a rotation axis of the disk and perpendicular to the first surface. A disc cartridge characterized in that a cross section on two sides is concave with respect to the disc. A casing that rotatably accommodates a flexible disk, and the rotation of the disk is stabilized when information is recorded or reproduced while the head is relatively moved along the recording surface of the disk. A disc cartridge comprising a stabilizing member,
The stabilizing member includes a rotating shaft of the disk, and a cross section in a plane perpendicular to the moving path of the head is concave with respect to the disk, on the disk at least on the downstream side of the head and in the vicinity of the outer peripheral portion. A disc cartridge, wherein a meat stealing portion is formed in a portion corresponding to an area.   The disk cartridge according to claim 6, wherein the meat stealing portion is an exhaust port.   8. The disk cartridge according to claim 5, wherein the casing has a through hole formed at a position on the disk corresponding to at least a region on the downstream side of the head and in the vicinity of the outer peripheral portion.   The disk cartridge according to claim 5, wherein the casing has a cylindrical side wall portion surrounding the disk.

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