JP2006139894A - Recording/playing-back device and disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a satisfied characteristic for a surface wobbling of a disk in whole area on a straight line in the optional radial direction on a disk surface and also to simplify the constitution for generating aerodynamical working force. <P>SOLUTION: 1st stabilizing members 31 for generating the 1st aerodynamical working force such as tilting the surface of the optical disk 1 to the radial direction of the disk, 2nd stabilizing members 32 respectively formed integrally with the 1st stabilizing members 31 to generate the 2nd working force such as making the optical disk 1 parallel with the straight line A passing through a center of the optical disk 1, and a 4th stabilizing member 30 confronted with the optical pickup 4 facing each other across the optical disk 1 to make a 3rd aerodynamical working force actuate on the surface of the disk, are disposed at the side opposite to the installation side of the optical pickup 4 for optically scanning with respect to the optical disk 1 which is a flexible recording disk. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing apparatus that performs recording and / or reproducing processing on a flexible recording disk, and a disk cartridge that stores the recording disk.

  In recent years, there has been a demand for information recording media to record large volumes of digital data, such as the start of digitization of television broadcasting. For example, in the field of optical discs, one of the basic methods for increasing the density is to reduce the diameter of the light spot collected on the optical disc for recording / reproduction (hereinafter referred to as an optical disc). As a representative example, the recording disk used in the recording / reproducing apparatus targeted by the present invention is intended for all the disk-shaped recording disks such as phase change memory, magneto-optical memory, hologram memory, etc. Not limited to optical discs).

  For this reason, in increasing the density of the optical disk, it is effective to shorten the wavelength of light used for recording / reproduction and increase the numerical aperture NA of the objective lens. As for the wavelength of light, a wavelength of near infrared light of 780 nm is used for CD (compact disk), and a wavelength of about 650 nm of red light is used for DVD (digital versatile disk). Recently, a blue-violet semiconductor laser has been developed, and it is expected that a laser beam of around 400 nm will be used in the future.

  As for the objective lens, the NA for CD is less than 0.5, but the NA for DVD is about 0.6. In the future, it is required to further increase the numerical aperture (NA) to NA 0.7 or more. However, increasing the NA of the objective lens and shortening the wavelength of light also increase the influence of aberrations when focusing light. Therefore, the margin for the tilt of the optical disk is reduced. Further, since the depth of focus is reduced by increasing the NA, the focus servo accuracy must be increased.

  Furthermore, since the distance between the objective lens and the recording surface of the optical disk is reduced by using a high-NA objective lens, the surface vibration of the optical disk must be reduced before the focus servo at the start is pulled in. The objective lens and the optical disk may collide, causing a pickup failure.

  As a short-wavelength, high-NA high-capacity optical disk, for example, as described in Non-Patent Document 1, a recording film is formed on a substrate that is as thick as a CD and has high rigidity, and is used for recording / reproducing light. Has been proposed which records / reproduces data on / from a recording film through a thin cover layer without passing through the substrate.

Further, in Patent Documents 1 to 3 or Non-Patent Documents 1 and 2, in order to stabilize the surface runout in the optical disk by utilizing the aerodynamic action force according to Bernoulli's law, it is flexible to face the stabilizing member. There is a description of a recording / reproducing apparatus configured to rotate an optical disk having a configuration or a configuration of a flexible optical disk.
JP-A-7-105657 Japanese Patent Laid-Open No. 10-308059 US Patent Application Publication No. 2002/0186636 O PLUS E Vol. 20, No. 2, p. 183 pages “Optical Lead-Out of Video Disc”, “Either READOUT OF VIDEODISC”, IEEE TRANSACTION ON CONSUMER ELECTRONICS, November 1976, p. 304-308

  However, in the conventional technique, when the substrate of the optical disk is formed of a rigid body, in order to reduce surface deflection and tilt in the rotating optical disk, extremely accurate molding is performed and recording is performed at a low temperature so that thermal deformation does not occur. A film must be deposited. This prolongs the tact time associated with optical disc manufacture and increases costs.

  Further, in the method of rotating a flexible optical disk on a stabilizing plate described in Patent Documents 1 and 2, there is a high risk that the optical disk and the stabilizing plate will slide in contact with each other. There is a problem that the plate surface is damaged. This sliding causes dust generation, which causes an error.

  Moreover, there is a limit to the effect of reducing the disc surface shake by simply using a flat stabilizer, and the risk of collision between the objective lens and the disc is still a problem when using a high NA objective lens. It remains.

  As one of the methods using the stabilizing plate, there is a method as described in Non-Patent Document 2. In this configuration, by rotating the flexible disc with a narrow gap formed by a member composed of two stabilizing members called U-shaped stabilizers, it is possible to achieve dramatic reduction in disc surface runout. However, as described in Non-Patent Document 2, since the gap between the flexible disk and the stabilizing member is as small as 25 μm on one side, dust or the like is caught between the stabilizing member and the disk, and the recording film is damaged. There is a risk of causing an error directly. In particular, in this configuration, since the stabilizing member is always close to the front and back of the disc, this problem cannot be avoided even when the information recording portion is formed on either the front or back of the disc.

  As one means for solving these problems, the applicant of the present application uses a cylindrical stabilization guide member in which a surface facing the optical disc forms an arc shape in Patent Document 3, etc. In areas where the surface runout due to the air pressure due to the air becomes stable, areas where no air pressure action is generated (a space without a stabilizing guide member) are provided on the upstream and downstream sides in the disk rotation direction to stabilize the surface runout. In order to increase the effect of stabilizing force by aerodynamic force by reducing the repulsive force in the optical disk at the part where the surface blurring is stabilized by making the optical disk have a “escape” part at the front and rear positions of the part Proposed the invention.

  According to the invention of Patent Document 3, it is possible to reliably suppress the surface shake of the flexible optical disk, enable high-density recording, and prevent occurrence of problems such as sliding contact with the objective lens. On the other hand, in reality, complicated position adjustment control of the stabilizing guide member and the recording / reproducing head is required, which not only increases the load on the drive control system but also significantly increases the apparatus cost. End up.

  An object of the present invention is to solve the above-mentioned problems, obtain a good disk surface run-out characteristic over the entire area on a straight line in an arbitrary radial direction on the disk surface, and to generate an aerodynamic working force Is to provide a recording / reproducing apparatus and a disk cartridge.

  In order to achieve the above object, according to the first aspect of the present invention, the flexible recording disk is in the vicinity of the flow line scanned by the recording / reproducing means and passes near the center of the recording disk. In a recording / reproducing apparatus having an aerodynamic action means for generating an aerodynamic action force in at least one of the areas when the recording disk rotates, the recording / reproducing apparatus includes the recording force as the action force. A first acting force that tilts the disk surface in the radial direction of the disk and a second acting force that causes the recording disk surface to be parallel to the straight line are generated. Compared with the case where only the recording / reproducing means is applied, the disc surface runout in the entire radial direction of the disc scanned by the recording / reproducing means can be remarkably stabilized and the disc surface runout is stabilized. It can be arranged to go to a substantially straight line.

  According to a second aspect of the present invention, in the recording / reproducing apparatus according to the first aspect, a third action is provided on the opposite side of the recording disk with respect to the generation side of the first acting force and the second acting force. With this configuration, it is possible to easily achieve extremely small disc surface runout characteristics in the radial direction of the disc simply by applying a third aerodynamic action force in the region according to claim 1. Can be obtained on the straight line. In addition, the third acting force can be obtained by simply acting on one side of the recording disk, and a structure such as sandwiching the disk between both sides of the recording disk is not necessary. If the structure is formed on the side opposite to the working surface, it is possible to avoid the occurrence of problems such as loss of recorded information and increased errors due to collision between the means for generating the third acting force and the recording disk. it can.

  According to a third aspect of the present invention, in the recording / reproducing apparatus according to the first or second aspect, the first acting force and the second acting force generating portion in the aerodynamic acting means are integrated. This configuration makes it possible to securely fix the relative positions of the first and second acting forces, eliminating the need for adjustments, reducing the number of parts required to generate the acting force, and the production process. The cost can be reduced by simplifying the above.

  According to a fourth aspect of the present invention, in the recording / reproducing apparatus according to any one of the first to third aspects, the aerodynamic acting means includes a first stabilizing member that generates a first acting force, A second stabilizing member that generates a second acting force in a region other than the first stabilizing member, and the first stabilizing member has a structure that generates a repulsive force against the recording disk. In the second stabilizing member, the main shape of the cross section in the flow direction of the recording / reproducing means on the disk facing surface is substantially linear, and the main shape of the cross section in the direction perpendicular thereto is a concave shape, With this configuration, it is possible to effectively obtain a first acting force for inclining the recording disk surface in the disk radial direction and a second acting force for making the recording disk surface parallel to the straight line.

  According to a fifth aspect of the present invention, in the recording / reproducing apparatus according to the fourth aspect of the invention, a fourth is provided on the opposite side across the recording disk with respect to the installation side of the first stabilization member and the second stabilization member. A third stabilizing member for generating the acting force is provided, and in the third stabilizing member, the main shape of the cross section in the flow direction of the recording / reproducing means on the disk facing surface is substantially linear, and The main shape of the cross section in the vertical direction is a convex shape, and this configuration can provide stability of the shape of the entire disk surface and improve the straightening effect of the recording disk surface near the straight line It becomes possible to make it.

  According to a sixth aspect of the present invention, in the recording / reproducing apparatus according to the fourth or fifth aspect, the first stabilizing member and the second stabilizing member are integrated. At the design stage, the relative position between the first stabilizing member and the second stabilizing member can be fixed, and adjustment during assembly of the device is not necessary. In addition, the cost can be reduced by reducing the number of parts and simplifying the production process.

  According to a seventh aspect of the present invention, there is provided the recording / reproducing apparatus according to the fourth aspect, wherein a fourth acting force is generated on the opposite side of the recording / reproducing means with respect to the recording disk. A stabilizing member is provided. With this configuration, the third acting force is applied to the disk surface, so that the disk surface deflection can be drastically reduced.

  The invention according to claim 8 is the recording / reproducing apparatus according to claim 4, wherein the recording / reproducing means is provided with a fifth stabilizing member for generating a third acting force on the recording disk. With this configuration, it is possible to drastically reduce the disc surface run-out by applying the third acting force to the disc surface.

  According to the ninth aspect of the invention, a flexible recording disk is accommodated, and the surface of the recording disk is close to the flow line scanned by the recording / reproducing means and passes through the vicinity of the center of the recording disk. In a disc cartridge provided with aerodynamic action means for generating an aerodynamic action force in at least one of the areas when the recording disk is rotated, the straight line is divided into two areas by a straight line. A first stabilizing member that generates a first acting force that tilts the recording disk surface in the radial direction of the disk, and a second stabilization that generates the second acting force in a region other than the first stabilizing member. With this configuration, the effects of the respective claims can be obtained by simplifying the configuration on the recording / reproducing apparatus side. Further, since the first stabilizing member and the second stabilizing member can be individually set for each disk cartridge, the first stabilizing member and the second stabilizing member are individually set for each of various disk specifications. It becomes easy to design, and it becomes easy to correct the deviation of the stabilization condition due to the variation of the disk specification.

  According to a tenth aspect of the present invention, in the disk cartridge according to the ninth aspect, the first stabilizing member is structured to generate a repulsive force against the recording disk, and the second stabilizing member has a structure of the disk facing surface. The main shape of the cross section in the direction of flow of the recording / reproducing means is substantially linear, and the main shape of the cross section in the direction perpendicular to this is a concave shape. Can be obtained, and a second acting force that makes the recording disk surface parallel to the straight line can be obtained.

  According to an eleventh aspect of the present invention, there is provided a disc cartridge according to the ninth or tenth aspect, wherein the recording disk is sandwiched with respect to the installation side of the first stabilizing member and the second stabilizing member, and the fourth is arranged on the opposite side. A third stabilizing member for generating the acting force is provided, and in the third stabilizing member, the main shape of the cross section in the flow direction of the recording / reproducing means on the disk facing surface is substantially linear, and The main shape of the cross section in the vertical direction is a convex shape, and this configuration can provide stability of the shape of the entire disk surface and improve the straightening effect of the recording disk surface near the straight line It becomes possible to make it.

  According to a twelfth aspect of the present invention, in the disk cartridge according to any one of the ninth to eleventh aspects, the first stabilizing member and the second stabilizing member are integrated, and this configuration is provided. Thus, it becomes possible to fix the relative positions of the first stabilizing member and the second stabilizing member at the part design stage, and the adjustment at the time of assembling the apparatus becomes unnecessary. In addition, the cost can be reduced by reducing the number of parts and simplifying the production process.

  According to a thirteenth aspect of the present invention, there is provided a disc cartridge according to the ninth or tenth aspect, wherein a fourth acting force is generated on the opposite side of the recording / reproducing means with respect to the recording disc. A stabilizing member is provided. With this configuration, the third acting force is applied to the disk surface, so that the disk surface deflection can be drastically reduced.

  According to the recording / reproducing apparatus and the disk cartridge of the present invention, two areas are defined by the straight line A that is close to the flow line that the recording / reproducing means scans in the surface of the recording disk and passes through the vicinity of the center of the recording disk. In a recording / reproducing apparatus having a mechanism for generating an aerodynamic acting force in at least one of the areas when the recording disk rotates, the acting force causes the recording disk surface to tilt the disk radial direction. Compared with the case where only the first acting force is applied, the first acting force and the second acting force that causes the recording disk surface to be parallel to the straight line A are used. It is possible to drastically stabilize the disc surface runout in the entire radial direction of the disc scanned by the reproducing means, and to arrange the area where the disc runout is stabilized on a substantially straight line. It came. In this region, it is possible to easily obtain extremely small disc surface run-out characteristics on a straight line in the disc radial direction only by applying a third aerodynamic acting force with a simple configuration. As a result, it is possible to provide a recording / reproducing apparatus and a disk cartridge which can obtain good disk surface run-out characteristics over the entire area on a straight line in an arbitrary radial direction on the disk surface, and which can simplify the aerodynamic configuration operation. We were able to.

  The outline of the present invention will be described.

  As a result of various experiments and considerations regarding the phenomenon in the case where an aerodynamic force is applied to the rotating recording disk, which is the basis of the recording / reproducing apparatus according to the present invention, an arbitrary analysis on the surface of the recording disk is performed. When an aerodynamic force (first acting force) that inclines the recording disk surface in the radial direction of the disk is applied to the area of, approximately ± A linearizing force in the radial direction was applied to the recording disk surface near 90 degrees away, and the rigidity of the recording disk surface was increased, and the phenomenon that the disk surface vibration near the recording disk surface was stabilized was captured. A recording / reproducing apparatus using this phenomenon was prototyped and various experiments were conducted for consideration.

  1 is a plan view of the main part of the prototype recording / reproducing apparatus, FIG. 2 is a front view of the apparatus shown in FIG. 1, 1 is an optical disk that is a flexible recording disk, and 2 is a rotation of the optical disk 1. A hub of one holding member that holds the optical disc 1 mounted at the center (center) portion for rotation, and a chucking portion that is the other holding member is fitted to the hub 2 to rotate the optical disc 1. The spindle motor 4 moves in the radial direction of the optical disc 1 to focus the light beam on the optical disc 1, and performs optical scanning (flow line R direction) on the optical disc 1 in order to perform information recording / reproduction processing. An optical pickup which is a recording / reproducing means to be performed.

  Further, 31 is a first stabilizing member for causing the first acting force to act on the disk surface. In this prototype, an aerodynamic force is applied to each of the areas S1 and S2 on the disk surface divided into two by a straight line A that is close to the flow line R of the optical pickup 4 and passes near the center of the optical disk 1. The configuration.

  This prototype demonstrated the phenomenon that the disc surface runout is stabilized over the entire optical disc surface near the straight line A (not only in the vicinity of the optical pickup flow line R, but also including a position shifted by 180 degrees from the flow line R). . As a result of further studies, it has been newly found that the effect of straightening the disk surface and suppressing the surface run-out can be improved by applying a second acting force that makes the optical disk surface parallel to the straight line A. .

  Due to the effect of straightening the recording disk surface near the straight line A, the effect of improving the rigidity, and the effect of suppressing the surface deflection, the straight line can be obtained by combining the first acting force and the second acting force. In the disk surface in the vicinity of A, a linear region in which the disk surface vibration is stabilized can be obtained, and the stabilization of the effective disk surface vibration by the third acting force in the vicinity of the straight line A is complicatedly controlled. It could be easily realized on a straight line near the straight line A without using a mechanism.

  Embodiments of the present invention will be described below.

  FIG. 3 is a front view of the main part of the recording / reproducing apparatus for explaining the first embodiment of the present invention. In the following description, members corresponding to those already described are denoted by the same reference numerals.

  In FIG. 3, 1 is an optical disk that is a flexible recording disk, 2 is a hub that is one holding member for holding the optical disk 1 mounted on the rotation center (center) portion of the optical disk 1 for rotation, The spindle motor 4 that rotates the optical disk 1 by fitting the chucking portion, which is the other holding member, to the hub 2, moves in the radial direction of the optical disk 1 to focus the optical beam on the optical disk 1. An optical pickup 10 is a recording / reproducing means for performing optical scanning (direction of flow line R) with respect to the optical disc 1 in order to perform information recording / reproducing processing.

  Further, 31 is a first stabilizing member for causing the first aerodynamic acting force to act on the disk surface, and 32 is formed integrally with the first stabilizing member 31, and the second aerodynamics is formed. The second stabilizing member 30 for causing a large acting force to act on the disc surface is disposed opposite to the optical pickup 4 and the optical disc 1 so that the third aerodynamic acting force acts on the disc surface. This is a fourth stabilizing member.

  In the configuration of the recording / reproducing apparatus shown in FIG. 3, the configuration in which the first stabilizing member 31 and the second stabilizing member 32 are provided in the housing 10 of the apparatus main body has been described. However, the recording / reproducing apparatus shown in FIG. The first stabilizing member 31 and the second stabilizing member 32 may be provided in the disc cartridge 11 as shown in the sectional view of FIG. 5 and 6 are diagrams showing the configuration of the cartridge in FIG. 4, FIG. 5 is a plan view of the cartridge, and FIG. 6 is a partial cross-sectional view along AA in FIG.

  5 and 6, reference numeral 12 denotes a first through hole for allowing the fourth stabilizing member 30 to be inserted and movement in the radial direction of the disk, and 13 denotes a part of the optical pickup 4 and the spindle motor 3. This is a second through hole that is inserted and allows the optical pickup 4 to move in the radial direction of the disk. A shutter for opening and closing the through holes 12 and 13, a mechanism for fixing the optical disc 1 in the cartridge, and other mechanisms necessary for installing the cartridge in the spindle motor 3 are shown in the figure. Not.

  FIG. 7 is a front view of the main part of the recording / reproducing apparatus for explaining the second embodiment of the present invention. The second embodiment is different from the first embodiment in that the first stabilizing member 31 and the second stabilizing member 32 are arranged to face each other with the optical disc 1 therebetween, and a fourth aerodynamic acting force is provided. This is the point that a third stabilizing member 33 for acting on the disk surface is provided.

  In the second embodiment, in the configuration of the recording / reproducing apparatus shown in FIG. 7, a first stabilizing member 31, a second stabilizing member 32, and a third stabilizing member 33 are provided in the housing 10 of the apparatus body. The first stabilizing member 31, the second stabilizing member 32, and the third stabilizing member 33 are connected to the disk cartridge 11 as shown in the sectional view of the recording / reproducing apparatus shown in FIG. You may make it provide in. 9 and 10 are diagrams showing the configuration of the cartridge in FIG. 8, wherein FIG. 9 is a plan view of the cartridge, and FIG. 10 is a partial cross-sectional view along AA in FIG.

  Each said embodiment is described concretely.

  In the configuration according to the first embodiment shown in FIG. 3 to FIG. 6, the disc surface runout in the entire disc radial direction scanned by the optical pickup 4 is stabilized by the action of the first stabilizing member 31 and the second stabilizing member 32. The area where the disk surface runout was stabilized could be arranged on a substantially straight line. As a result, an extremely small disk runout characteristic can be easily achieved in the radial direction of the disk simply by applying a third aerodynamic force to the optical disk 1 by a mechanism having a simple configuration such as the fourth stabilizing member 30. It can be obtained on the straight line A.

  Further, in the configuration according to the second embodiment shown in FIGS. 7 to 10, the disk surface runout in the entire disk radial direction scanned by the optical pickup 4 is caused by the action of the first stabilizing member 31 and the second stabilizing member 32. Can be arranged on the substantially straight line A, and the action of the third stabilizing member 33 on the optical disk 1 allows the shape of the entire disk surface to be stabilized. Stability can be obtained, and the linearization effect of the region where the disc surface run-out is stabilized can be improved. Thereby, the effect of Embodiment 1 was able to be improved further.

  Hereinafter, modifications of the disk cartridge according to the second embodiment will be described. However, the configuration of the modified example described below is applicable to the first embodiment that does not include the third stabilizing member 33, and can also be applied to a recording / reproducing apparatus that does not use a disk cartridge. .

  In Modification 1 of Embodiment 2 shown in FIG. 11, the fifth stabilizing member 35 for generating the third acting force is disposed in the moving groove 33 a formed in the third stabilizing member 33, and The first stabilizing member 31 and the second stabilizing member 32 are formed on the upper surface side of the optical pickup 4 that is disposed to face the first stabilizing member 31 through the optical disc 1.

  12 and 13 are diagrams showing the configuration of the disk cartridge 11 in the first modification of FIG. 11, in which FIG. 12 is a plan view of the cartridge, FIG. 13 is a partial cross-sectional view along AA in FIG. In order to enable movement of the optical pickup 4 having the five stabilizing members 35 formed on the upper surface in the disk radial direction, a movement groove 33a is formed in the third stabilizing member 33.

  14 and 15 are diagrams showing a configuration of the disk cartridge 11 in the second modification of the second embodiment, in which FIG. 14 is a plan view of the cartridge, and FIG. 15 is a partial cross-sectional view along AA in FIG. In the second modification, a configuration in which the first stabilizing member 31 and the second stabilizing member 32 are disposed only on the half surface of the optical disc 1 is employed.

  16 and 17 are views showing a configuration of the disk cartridge 11 according to the third modification of the second embodiment, in which FIG. 16 is a plan view of the cartridge, and FIG. 17 is a partial cross-sectional view along AA in FIG. In Modification 3, as the fourth stabilizing member 30, the main shape of the cross section in the flow line direction of the optical pickup 4 on the opposite surface of the optical disc 1 is linear, and the cross section in the direction perpendicular thereto is a convex curved surface shape. A configuration extending in the radial direction of the disk is adopted.

  18 and 19 are diagrams showing a configuration of the disk cartridge 11 in the fourth modification of the second embodiment, in which FIG. 18 is a plan view of the cartridge, and FIG. 19 is a partial cross-sectional view along AA in FIG. In the fourth modification, eight regions (A) are spaced at approximately 45 degrees intervals starting from a straight line A that is close to the flow line scanned by the optical pickup 4 and passes through the vicinity of the center O of the optical disc 1 in the plane of the optical disc 1. , B, C, D, E, F, G, H), in a region B of approximately 45 degrees to approximately 90 degrees from the starting point, and in a region C of approximately 90 degrees to approximately 135 degrees from the starting point, and A first stabilizing member is provided at a portion where the recording disk exhibits flexibility in a region F of approximately 225 degrees to approximately 270 degrees from the starting point and in a region G of approximately 270 degrees to approximately 315 degrees from the starting point. It was configured to have one 31 Than it is.

  FIG. 20 is a cross-sectional view showing the configuration of the recording / reproducing apparatus in the fifth modification of the second embodiment. The optical pickup 4 having the fifth stabilizing member 35 formed on the end face is connected to the first stabilizing member 31. It is provided on the same side as the installation side of the second stabilizing member 32 so as to be movable in the disk radial direction.

  In all the embodiments including the modification, it is possible to integrate the first stabilization member 31 and the second stabilization member 32 as one stabilization member, and The fourth stabilization member 30 may be disposed on the opposite side of the optical disc 1 with respect to the installation side of the first stabilization member 31 and the second stabilization member 32.

  21 to 23 are views showing a sixth modification of the second embodiment, in which FIG. 21 is a cross-sectional view of a recording / reproducing apparatus, FIG. 22 is a plan view of a disk cartridge used in the recording / reproducing apparatus, and FIG. 23 is a partial cross-sectional view taken along line AA in FIG.

  In the modified example 6, the first stabilizing member 31 provided to protrude from the second stabilizing member 32 in the second embodiment shown in FIGS. 8 to 10 is eliminated, and the lower surface of the second stabilizing member 32 ( The optical disk 1 side) has a simple curved surface 32a, and the inclined portion of the curved surface 32a has a function of generating both the first acting force and the second acting force. The stabilizing member in Modification 6 is referred to as a second stabilizing member because the second stabilizing member 32 described above is the base.

  24 to 26 are diagrams showing a seventh modification of the second embodiment, in which FIG. 24 is a cross-sectional view of a recording / reproducing apparatus, FIG. 25 is a plan view of a disk cartridge used in the recording / reproducing apparatus, and FIG. 26 is a partial cross-sectional view taken along line AA in FIG.

  In the modified example 7, similarly to the modified example 6, the lower surface of the second stabilizing member 32 has a simple curved surface 32a, and the first acting force and the second acting force are applied to the inclined portion of the curved surface 32a. Both generation functions are assigned, and the generation function of the third acting force is assigned to the ridge line portion of the curved surface 32a (the central hole of the second stabilization member 32). Also in Modification 7, the stabilizing member is referred to as the second stabilizing member because the second stabilizing member 32 described above is the base.

  Hereinafter, the present invention will be described more specifically based on examples and comparative examples.

Example 1
In Example 1, the structure shown in FIGS. 4 to 6 was adopted. The shape in which the first and second stabilizing members 31 and 32 are combined is a three-dimensional complex shape, and the surface shape cannot be expressed strictly, but the main shape element for achieving the effect of the present invention is It is as follows.

  First, the surface of the first stabilizing member 31 facing the optical disc (diameter 120 mm) 1 has a curvature radius of 200 mm, and the shape of the surface facing the optical disc 1 has a substantially circular shape with a diameter of 25 mm. Further, the second stabilizing member 32 has a linear shape as a main shape of the cross section in the flow line direction of the optical pickup 4 on the opposite surface of the optical disc 1 and a concave shape with a radius of curvature (250 mm) in a direction perpendicular thereto. did.

In Example 1, a polycarbonate sheet having a diameter of 120 mm and a thickness of 75 μm was used as the disk substrate. In preparing the disk, first, a groove having a stamper pitch of 0.6 μm and a width of 0.3 μm was transferred to the sheet by thermal transfer, and then a sheet / Ag reflection layer 120 nm / (ZrO ₂ —Y ₂ O) by sputtering. ₃₎ it was formed in the order of _{-SiO 2 7nm / AgInSbTeGe 10nm / ZnS} -SiO 2 25nm / Si 3 N 4 10nm. The information recording area was set in a range from an inner diameter of 40 mm to an outer diameter of 118 mm (radius 20 mm to 58 mm). Thereafter, a UV resin was spin-coated and cured by ultraviolet irradiation to form a transparent protective film having a thickness of 5 μm. Further, a hard coat having a thickness of 10 μm was applied to the opposite surface. A hub 2 having an outer diameter of 30 mm, an inner diameter of 15 mm, and a thickness of 0.3 mm was attached to the center of the disk. The finished state of the disk was slightly warped toward the hard coat side.

  The optical disc 1 was rotated at a disc rotational speed of 15 m / sec, and the first and second stabilizing members 31 and 32 were applied to the optical disc 1. In this state, the fourth stabilizing member 30 was scanned in the radial direction of the disk (three levels of radius 25 mm, 40 mm, and 55 mm), and a laser displacement meter was placed at the position of the optical pickup 4 to evaluate the disk runout. At this time, the position of the fourth stabilizing member 30 in the disc rotation axis direction was fixed to the optical disc reference surface (the surface on the fourth stabilizing member side when the optical disc was assumed to be flat).

(Example 2)
In Example 2, the configuration shown in FIGS. 8 to 10 was adopted. The first and second stabilizing members 31 and 32 were the same as those in Example 1. For the third stabilizing member 33, the main shape of the cross section in the flow line direction of the optical pickup 4 on the opposite surface of the optical disc 1 is a linear shape, and the cross section in the direction perpendicular thereto is a convex shape having a radius of curvature (250 mm). .

  The same optical disk 1 as in Example 1 was used. The optical disk 1 was rotated at a disk rotational speed of 15 m / sec, and the first to third stabilizing members 31 to 33 were applied to the optical disk 1. In this state, the fourth stabilizing member 30 was scanned in the radial direction of the disk (three levels of radius 25 mm, 40 mm, and 55 mm), and a laser displacement meter was placed at the position of the optical pickup 4 to evaluate the disk runout. At this time, the position of the fourth stabilizing member 30 in the disc rotation axis direction was fixed to the optical disc reference surface (the surface on the fourth stabilizing member side when the optical disc was assumed to be flat).

(Example 3)
In Example 3, the configuration shown in FIGS. 11 to 13 was adopted. The first to third stabilizing members 31 to 33 were the same as those in Example 2.

  The same optical disk 1 as in Example 1 was used. The optical disc 1 was rotated at a disc rotational speed of 15 m / sec, and the first to third stabilizing members 31 to 33 were applied to the optical disc 1. In this state, the optical pickup 4 on which the fifth stabilizing member 35 is formed is scanned in the radial direction of the disc with the focus servo applied (three levels of radius 25 mm, 40 mm, and 55 mm), and the disc surface shakes at the focus position. Was measured with a laser displacement meter. For measurement with a laser displacement meter, the disk cartridge 11 was made of a transparent member, and the disk surface deflection measurement was performed by passing through the disk cartridge 11. At this time, the position of the fifth stabilizing member 35 in the disc rotation axis direction was fixed to the optical disc reference surface (the surface on the fifth stabilizing member side when the optical disc is assumed to be flat).

Example 4
In Example 4, the configuration shown in FIGS. 21 to 23 was adopted. In the second stabilizing member 32, the main shape of the cross section in the flow line direction of the optical pickup 4 on the opposite surface of the optical disc 1 is a linear shape, and the cross section in the direction perpendicular to the main shape is a concave shape with a radius of curvature (1000 mm). The third stabilizing member 33 is a convex shape having a linear shape in the cross section in the flow line direction of the optical pickup 4 on the opposite surface of the optical disc 1 and a curvature radius (1000 mm) in the cross section perpendicular thereto. did.

  The same optical disk 1 as in Example 1 was used. The optical disk 1 was rotated at a disk rotational speed of 15 m / sec, and the second and third stabilizing members 32 and 33 were applied to the optical disk 1. In this state, the fourth stabilizing member 30 was scanned in the radial direction of the disk (three levels of radius 25 mm, 40 mm, and 55 mm), and a laser displacement meter was placed at the position of the optical pickup 4 to evaluate the disk runout. At this time, the position of the fourth stabilizing member 30 in the disc rotation axis direction was fixed to the optical disc reference surface (the surface on the fourth stabilizing member side when the optical disc was assumed to be flat).

(Example 5)
In Example 5, the configuration shown in FIGS. 24 to 26 was adopted. In the second stabilizing member 32, the main shape of the cross section in the flow line direction of the optical pickup 4 on the opposite surface of the optical disc 1 is a linear shape, and the cross section in the direction perpendicular to the main shape is a concave shape with a radius of curvature (1000 mm). The third stabilizing member 33 is a convex shape having a linear shape in the cross section in the flow line direction of the optical pickup 4 on the opposite surface of the optical disc 1 and a curvature radius (1000 mm) in the cross section perpendicular thereto. did.

  The same optical disk 1 as in Example 1 was used. The optical disk 1 was rotated at a disk rotational speed of 15 m / sec, and the second and third stabilizing members 32 and 33 were applied to the optical disk 1. In this state, a laser displacement meter was placed at the position of the optical pickup 4 to evaluate disc surface vibration. The evaluation radius position was set to three levels of radius 25 mm, 40 mm, and 55 mm. At this time, the position of the second stabilizing member 32 in the disc rotation axis direction is such that the ridge line of the second stabilizing member 32 is the optical disc reference surface (the surface on the second stabilizing member side when the optical disc is assumed to be flat). ) To be 100 μm away.

(Comparative example)
The configuration of the comparative example is the configuration shown in the plan view of FIG. 27 and the front view of FIG. 28, and uses only one cylindrical stabilizing member 36. The stabilizing member 36 has a cylindrical shape with a radius of curvature of 100 mm at the end surface facing the optical disc 1 and a diameter in plan view of 10 mm.

  It should be noted that only the minimum necessary configuration for explanation is shown here, and details of the control system and the like are not shown, but the stabilizing member 36 is provided with a moving mechanism in the disk radial direction.

  In the comparative example having the above-described configuration, the same disk as in Example 1 was rotated at a disk rotational speed of 15 m / sec. Thereafter, the stabilizing member 36 is disposed so that the working surface thereof is in the vicinity of the disk reference surface, moved in the disk radial direction, and disposed at the position of the optical pickup 4 at each disk radial position of 25 mm, 40 mm, and 55 mm. The disc surface runout was measured with a laser displacement meter.

  27 and 28 show an example in which the stabilizing member 36 is pushed into the disk reference surface. In this comparative example, the pushing amount is zero.

  In each of the examples and comparative examples, the measurement results of the disc surface runout at each radial position are as shown in FIG. As shown in this result, in this example, it was possible to obtain good disk surface run-out characteristics over the entire area on the straight line in the arbitrary radial direction on the disk surface. In order to obtain this good disc surface runout, the fourth stabilizing member 30 or the fifth stabilizing member 35 that generates the third acting force is provided with a complicated mechanism, and any complicated operation is performed. There was no need to let them go. That is, the above-mentioned good disk surface run-out characteristic could be obtained only by the action of aerodynamic force by the extremely simplified configuration operation. Compared with the comparative example, the difference is remarkable, and it can be understood that the effect of the present invention is great.

  Further, as shown in the present embodiment, a stabilizing member is disposed on the opposite side of the optical pickup 4 with respect to the optical pickup 4 installation side, thereby suppressing the disc surface fluctuation of the recording / reproducing portion of the optical disc 1. However, the present invention is effective when applied to a recording / reproducing apparatus having a configuration in which the optical pickup 4 itself is provided with a stabilizing member to suppress the disc surface vibration of the recording / reproducing part. However, the present invention can be applied to any recording / reproducing apparatus having a configuration in which recording / reproducing is performed by stabilizing the disc surface vibration at the recording / reproducing position by an aerodynamic force, and is not intended to limit the applicable range. Absent.

  As described above, in the present embodiment and the present example, it is possible to obtain good disk surface run-out characteristics in the entire area on the straight line in the arbitrary radial direction on the disk surface by the simplified configuration and operation of the aerodynamic acting force. It is possible to provide a recording / reproducing device and a disc cartridge that can be used.

  The present invention is applied to a recording / reproducing apparatus that performs recording and / or reproducing processing on a flexible recording disk, and a disk cartridge that houses the recording disk. In addition, it is possible to target anything utilized in disk-shaped recording disks such as phase change memory, magneto-optical memory, and hologram memory.

The top view of the principal part of the recording / reproducing apparatus for demonstrating the outline of this invention Front view of the recording / reproducing apparatus shown in FIG. The front view of the principal part of the recording / reproducing apparatus for describing Embodiment 1 of this invention Sectional drawing for demonstrating the disc cartridge concerning Embodiment 1 of this invention which provided the 1st stabilization member and the 2nd stabilization member. The top view which shows the structure of the cartridge of FIG. AA partial sectional view of the cartridge of FIG. The front view of the principal part of the recording / reproducing apparatus for describing Embodiment 2 of this invention Sectional drawing for demonstrating the disc cartridge which concerns on Embodiment 2 of this invention which provided the 1st-3rd stabilization member. The top view which shows the structure of the cartridge of FIG. AA partial cross-sectional view of the cartridge of FIG. Sectional drawing which shows the principal part in the modification 1 of the recording / reproducing apparatus of Embodiment 2. FIG. FIG. 11 is a plan view of a disk cartridge in the first modification of FIG. FIG. 12 is a partial cross-sectional view of the cartridge of FIG. FIG. 6 is a plan view showing the configuration of a disk cartridge in a second modification of the second embodiment. 14 is a partial cross-sectional view taken along the line AA in the cartridge of FIG. FIG. 9 is a plan view showing the configuration of a disc cartridge according to Modification 3 of Embodiment 2. AA partial sectional view of the cartridge of FIG. FIG. 9 is a plan view showing the configuration of a disc cartridge according to Modification 4 of Embodiment 2. AA partial sectional view of the cartridge of FIG. Sectional drawing which shows the structure of the recording / reproducing apparatus in the modification 5 of Embodiment 2. FIG. Sectional drawing of the recording / reproducing apparatus which shows the modification 6 of Embodiment 2. FIG. Plan view of a disk cartridge used in the recording / reproducing apparatus of Modification 6 22 is a partial cross-sectional view taken along the line AA in the cartridge of FIG. Sectional drawing of the recording / reproducing apparatus which shows the modification 7 of Embodiment 2. FIG. Plan view of a disk cartridge used in the recording / reproducing apparatus of Modification 7 AA partial sectional view of the cartridge of FIG. The top view which shows the structure of the comparative example of this invention Front view of the comparative example of FIG. The figure which shows the measurement result of the disk surface runout in each radial position in the Example which concerns on this invention, and a comparative example

Explanation of symbols

1 Flexible optical disk (recording disk)
3 Spindle motor 4 Optical pickup (recording / reproducing means)
30 4th stabilization member 31 1st stabilization member 32 2nd stabilization member 33 3rd stabilization member 35 5th stabilization member

Claims (13)

  The surface of the flexible recording disk is divided into two areas by a straight line that is close to the flow line that the recording / reproducing means scans and passes through the vicinity of the center of the recording disk. In the recording / reproducing apparatus provided with aerodynamic action means for generating aerodynamic action force on at least one of the above, as the action force, a first action force for inclining the recording disk surface in the disk radial direction; A recording / reproducing apparatus for generating a second acting force that makes a recording disk surface parallel to the straight line.   2. The recording / reproducing apparatus according to claim 1, wherein a third acting force is generated on the opposite side of the recording disk with respect to a generating side of the first acting force and the second acting force. apparatus.   3. The recording / reproducing apparatus according to claim 1, wherein a part for generating the first acting force and the second acting force in the aerodynamic acting means is integrated.   The aerodynamic acting means includes a first stabilizing member that generates the first acting force and a second stabilization that generates the second acting force in a region other than the first stabilizing member. And the first stabilizing member is configured to generate a repulsive force with respect to the recording disk, and in the second stabilizing member, the flow direction of the recording / reproducing means on the disk facing surface is 4. The recording / reproducing apparatus according to claim 1, wherein the main shape of the cross section in the cross section is substantially linear, and the main shape of the cross section in the direction perpendicular thereto is a concave shape.   Installing a third stabilizing member for generating a fourth acting force on the opposite side across the recording disk with respect to the installation side of the first stabilizing member and the second stabilizing member; The third stabilizing member is characterized in that the main shape of the cross section in the direction of flow of the recording / reproducing means on the disk facing surface is substantially linear, and the main shape of the cross section in the direction perpendicular thereto is a convex shape. The recording / reproducing apparatus according to claim 4.   6. The recording / reproducing apparatus according to claim 4, wherein the first stabilizing member and the second stabilizing member are integrated.   5. The recording / reproducing device according to claim 4, wherein a fourth stabilizing member for generating a third acting force is installed on the opposite side of the recording disk from the installation side of the recording / reproducing means. Playback device.   5. A recording / reproducing apparatus according to claim 4, wherein the recording / reproducing means is provided with a fifth stabilizing member for generating a third acting force on the recording disk.   A recording disk having flexibility is housed, and the area of the recording disk is divided into two regions by a straight line that is close to the flow line that the recording / reproducing means scans and passes through the vicinity of the center of the recording disk. In a disc cartridge provided with aerodynamic action means for generating an aerodynamic action force in at least one of the regions when the disk rotates, the recording disk surface is tilted in the disk radial direction as the aerodynamic action means. A first stabilizing member that generates one acting force; and a second stabilizing member that generates the second acting force in a region other than the first stabilizing member. Disc cartridge.   The first stabilizing member is configured to generate a repulsive force with respect to the recording disk, and in the second stabilizing member, a main shape of a cross section in the flow direction of the recording / reproducing means on the disk facing surface is set. 10. The disc cartridge according to claim 9, wherein a main shape of a cross section in a substantially straight line shape and a direction perpendicular thereto is a concave shape.   Installing a third stabilizing member for generating a fourth acting force on the opposite side across the recording disk with respect to the installation side of the first stabilizing member and the second stabilizing member; The third stabilizing member is characterized in that the main shape of the cross section in the direction of flow of the recording / reproducing means on the disk facing surface is substantially linear, and the main shape of the cross section in the direction perpendicular thereto is a convex shape. The disk cartridge according to claim 9 or 10.   12. The disc cartridge according to claim 9, wherein the first stabilizing member and the second stabilizing member are integrated.   11. The fourth stabilizing member for generating a third acting force is installed on the opposite side of the recording / reproducing means with respect to the recording disk. Disc cartridge.

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