JP2006107699A - Recording/reproducing apparatus, driving method thereof and disk cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize an entire surface of a recording disk having flexibility in a wide speed range from a low rotational speed range to a high rotational speed range by surely realizing the stabilizing effect of a flat plate shaped stabilizing plate. <P>SOLUTION: A recording/reproducing apparatus is provided with: a flat plate shaped stabilizing plate 30 which aerodynamically suppresses wobbling of an optical disk 1; and a moving stage 40 to which a spindle motor 3 is fixed and which moves vertically to thereby adjust the location of a spindle 3a along the disk rotational shaft direction. The relative distance between the spindle 3a and the stabilizing plate 30 along the disk rotary shaft direction is adjusted by the moving stage 40 and the stabilizing plate 30 is made to appropriately act on the optical disk 1, so that wobbling of the optical disk 1 is stabilized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording / reproducing apparatus that performs recording and / or reproduction processing on a flexible recording disk, a driving method thereof, 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, it was less than NA0.5 for CD, but it is about NA0.6 for DVD. In the future, it is required to further increase the numerical aperture (NA) to NA or more 0.7. 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, it is necessary to reduce the surface blur of the optical disk before the focus servo at the start is pulled in. The objective lens and the optical disk may collide, causing a pickup failure. As described above, when the disc surface shake is large, it becomes a great obstacle in high-density recording. This is a problem common not only to optical disks but also to recording media that perform recording and reproduction by rotating the disk medium.

As a countermeasure, Patent Document 1 or Non-Patent Document 1 discloses that a flexible optical disk is rotated to face a stabilizing member in order to stabilize surface blurring in the optical disk using aerodynamic action force. There is a description of a recording / reproducing apparatus configured to be configured, or a configuration of a flexible optical disc.
Japanese Patent Laid-Open No. 10-308059 “Optical Readout of Video Disc”, “EITA TRANSPORTATION ON CONSUMER ELECTRONICS”, November 1976, p. 304-308

  As a method for solving the above-described problem, for example, as described in Patent Document 1, a method of stabilizing a stabilization plate by facing a disk surface has been proposed. However, in the method described in Patent Document 1, the requirement for stabilizing the disk surface is limited to disposing a planar stabilizing plate at a position substantially parallel to the disk, and other operating conditions are There is no description at all. With this configuration alone, it is impossible to reliably stabilize the entire disk surface.

  For example, as will be described in detail later, in order to stabilize the entire disk surface using a planar stabilization plate, the relationship between the “distance between the disk and the stabilization plate” and the “disk rotation speed” is the most important. The present inventors have found that there is nothing, but this is not described in Patent Document 1.

  Further, as described in Non-Patent Document 1, a stabilizing plate called a saddle plate is used to bend the disk by negative pressure generated when the disk is rotated, and it is composed of two stabilizing members called U-shaped stabilizers. There is a method of selectively stabilizing the disc surface runout in a specific region sandwiched between U-shaped stabilizers by rotating the disc so that the disc is sandwiched in a narrow gap formed by a member.

  However, in this method, when the disk rotation speed becomes high, the negative pressure generated by the saddle plate loses the tension due to the centrifugal force of the disk rotation, and the disk cannot be formed into a desired curved shape. The disc surface runout in the sandwiched area also increases.

  The object of the present invention is to solve the above-mentioned problems, reliably bring out the stabilization effect of the flat stabilizer, and to cover the entire surface of the flexible recording disk in a wide speed range from a low speed rotation range to a high speed rotation range. An object of the present invention is to provide a recording / reproducing apparatus having a structure that can be stabilized, a driving method thereof, and a disc cartridge.

  In order to achieve the above object, according to the first aspect of the present invention, the flexible recording disk is fixed to a spindle and rotated, and the flexibility is achieved by a stabilizing plate that applies an aerodynamic force. In a recording / reproducing apparatus that records and / or reproduces information on the recording disk by scanning a recording / reproducing head, the recording plate having at least the recording disk is provided. And a position adjusting means for adjusting the relative distance between the spindle and the stabilizing plate in the direction of the disc rotation axis. With this configuration, a flat stabilizing plate is used. Stabilize the entire disk surface by controlling the "distance between the disk and the stabilizing plate", which is one of the most important conditions for recording disk stabilization. Can be realized to perform the order set conditions, it is possible to perform stabilization of the recording disk by flat stabilizing plate. In particular, the position adjustment means can always select an appropriate stabilization condition even when the disk rotation speed is changed, and the disk surface can be stabilized in a wide rotation speed range from low speed to high speed. .

  According to a second aspect of the present invention, in the recording / reproducing apparatus according to the first aspect, the spindle is provided with a position adjusting means, and by this configuration, the position of the spindle for fixing the recording disk is adjusted. Thus, the “distance between the disc and the stabilizing plate” can be set appropriately.

  According to a third aspect of the present invention, in the recording / reproducing apparatus according to the first aspect, the stabilizing plate is provided with a position adjusting means, and by this configuration, the position of the stabilizing plate is adjusted. The “distance between the disk and the stabilizing plate” can be set directly and appropriately.

  According to a fourth aspect of the present invention, there is provided the recording / reproducing apparatus according to any one of the first to third aspects, further comprising a tilt detecting means for detecting a tilt angle in the disk radial direction of the outer periphery of the recording disk. In a recording disk stabilization structure using a flat stabilization plate, the tilt angle is close to zero under an appropriate stabilization condition, and increases when the tilt angle is outside the appropriate range. By detecting the tilt angle from this relationship, it is possible to determine the stabilized state of the recording disk.

  A fifth aspect of the present invention is a driving method used in the recording / reproducing apparatus according to any one of the first to fourth aspects, wherein the disk rotational speed is relative to the rotational speed of the disk between the spindle and the stabilizing plate. A position adjustment pattern is stored, and the relative position is adjusted in accordance with the disk rotation speed at the time of recording and / or reproduction, and even when the disk rotation speed is changed by this method, It is possible to always keep the “distance between the stabilizing plates” at an appropriate position.

  According to a sixth aspect of the present invention, in the driving method of the recording / reproducing apparatus according to the fifth aspect, a plurality of adjustment patterns when the configuration of the recording disk is changed are stored, and depending on the configuration of the recording disk used The adjustment pattern is selected, and by this method, for example, when the disk substrate is changed, when the specification of a formation layer such as a recording film is changed, or when the specification of the protective film is changed, the disk Even when the specification related to the mechanical characteristics is changed, the “distance between the disc and the stabilizing plate” can be set to an appropriate value.

  According to a seventh aspect of the present invention, there is provided a drive method for a recording / reproducing apparatus according to the fifth aspect, further comprising tilt detecting means for detecting a tilt angle in the disk radial direction of the outer periphery of the recording disk, wherein the detected tilt angle is zero. The relative position is adjusted so as to be in the vicinity, and by this method, the stabilization condition of the recording disk by the flat stabilizer can be adjusted to an appropriate value. In particular, if this adjustment method is used, it is possible to properly set the disc with the stabilization plate without setting a reference for the “distance between the disc and the stabilization plate” in advance and managing the value numerically. be able to.

  According to an eighth aspect of the present invention, in the driving method of the recording / reproducing apparatus according to the seventh aspect, the maximum value of the tilt angle is adjusted to -0.1 deg or more and +0.1 deg or less. It is possible to adjust the disc surface runout of the entire disc to 20 μm or less.

  According to the ninth aspect of the present invention, the deflection of the disk surface of the flexible recording disk is achieved by a stabilizing plate that fixes and rotates the flexible recording disk to the spindle and applies an aerodynamic force. Position adjustment to adjust the relative distance in the disk rotation axis direction between the spindle and the stabilizing plate by recording and / or reproducing information on the recording disk by scanning the recording / reproducing head A recording / reproducing apparatus equipped with a means for storing the recording disk, wherein the stabilizing plate has a flat plate shape covering at least the recording area of the recording disk, and is installed on the inner wall of the cartridge. With this configuration, even when recording / reproducing is performed using a disk cartridge in the recording / reproducing apparatus, It is possible in accordance with flat stabilizing plate exerts a stabilizing effect of the recording disk.

  As described above, according to the recording / reproducing apparatus, the driving method thereof, and the disk cartridge according to the present invention, the stabilization effect by the flat stabilizer in the wide speed range from the low speed rotation range to the high speed rotation range. Can be reliably pulled out, and the entire surface of the flexible recording disk can be stabilized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram of a main part for explaining the first embodiment of the recording / reproducing apparatus according to the present invention, wherein (a) shows a non-operating state, and (b) shows an operating state. Show.

  In FIG. 1, 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, Is a spindle motor that rotationally drives the optical disk 1, 3 a is a spindle that is the rotational output shaft of the spindle motor 3, and 4 is moved in the radial direction of the optical disk 1 to focus the light beam on the optical disk 1, An optical pickup which is recording / reproducing means for optically scanning the optical disk 1 for performing recording and / or reproducing processing, 5 is a spindle chuck for fixing the optical disk 1 to the spindle 3a, and 10 is a housing of the apparatus main body. Is the body.

  Further, reference numeral 30 denotes a planar stabilizing plate for suppressing disc surface deflection, and 40 denotes a moving stage for adjusting the position of the spindle 3a in the disc rotation axis direction by moving the spindle motor 3 up and down. , 42 is a support member that fixes the stabilization plate 30 in the apparatus and sets the position of the stabilization plate 30 in the disc rotation axis direction.

  Note that elements of the recording / reproducing apparatus that are not directly related to the present invention, such as a pickup scanning mechanism, are not shown.

  In the non-operating state shown in FIG. 1A, the optical disk 1 whose center is fixed to the spindle 3a is rotated by starting the spindle motor 3 and rotating the spindle 3a. Due to the aerodynamic action force between the optical disc 1 and the stabilization plate 30 generated by the rotation of the optical disc 1, the optical disc 1 is pulled toward the stabilization plate 30 as shown in FIG. Is substantially linear in the radial direction, and disc surface runout at the same part is reduced. Therefore, at least the optical disc 4 near the recording / reproducing position by the optical pickup 4 on the optical disc 1 is suppressed, and good recording / reproducing is performed.

  Furthermore, in the first embodiment, the spindle motor 3 is provided with a moving stage 40 as position control means in the disk rotation axis direction, and the relative distance in the disk rotation axis direction between the spindle 3a and the stabilizing plate 30 is adjusted to stabilize the spindle motor 3. The plate 30 is made to act appropriately on the optical disc 1 to stabilize the surface runout of the optical disc 1 (suppress surface runout).

  2A and 2B are schematic views of the main part for explaining the second embodiment of the recording / reproducing apparatus according to the present invention. FIG. 2A shows a non-operating state, and FIG. 2B shows an operating state. Show. In the following description, members corresponding to those already described are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 2, reference numeral 43 denotes a moving stage for adjusting the position of the stabilizing plate 30 in the disk rotation axis direction by moving the stabilizing plate 30 up and down, and 45 denotes a spindle motor 3 fixed in the apparatus. And a support member that fixedly sets the position of the spindle 3a in the disk rotation axis direction.

  In the second embodiment, a moving stage 43 serving as a position control means in the disc rotation axis direction of the stabilization plate 30 is provided, and the relative distance in the disc rotation axis direction between the spindle 3a and the stabilization plate 30 is adjusted. The surface shake 30 of the optical disc 1 is stabilized similarly to the first embodiment by appropriately operating the optical disc 30 on the optical disc 1.

  3A and 3B are schematic views of a main part for explaining the third embodiment of the recording / reproducing apparatus according to the present invention, wherein FIG. 3A shows a non-operating state, and FIG. 3B shows an operating state. Show.

  In FIG. 3, 20 is a disk cartridge for storing the optical disk 1, 21 is a guide member for guiding the position of the optical disk 1 in the disk cartridge 20 to be substantially centered, and 22 is the optical pickup 4 with respect to the disk cartridge 20. A slot portion 23 that allows the optical disc 1 to move in and out, a stabilization plane 23 as a stabilizing plate for stabilizing the surface deflection of the optical disc 1 (in this example, the bottom surface in the cartridge), and 46 a disc cartridge 20 in the apparatus. It is a support member that sets the position of the stabilizing plane 23 in the disc rotation axis direction by holding and fixing to the disc cartridge 20 and setting the position in the disc rotation axis direction of the disc cartridge 20.

  In the third embodiment, the stabilization plane 23 is provided in the disc cartridge 20, and the spindle motor 3 is provided with a moving stage 40 that is a position control means in the disc rotation axis direction, so that the spindle 3 a and the stabilization plane 23 are provided. By adjusting the relative distance in the disc rotation axis direction, the stabilizing plane 23 is appropriately applied to the optical disc 1 to stabilize the surface runout of the optical disc 1 as in the first and second embodiments.

  FIGS. 4A and 4B are schematic views of a main part for explaining the third embodiment of the recording / reproducing apparatus according to the present invention, wherein FIG. 4A shows a non-operating state, and FIG. 4B shows an operating state. Show.

  In FIG. 4, reference numeral 47 denotes a position control means for adjusting the position of the stabilizing plane 23 in the disk rotation axis direction by holding and fixing the disk cartridge 20 and adjusting the position of the disk cartridge 20 in the disk rotation axis direction. It is a moving stage.

  In the fourth embodiment, the stabilization plane 23 is provided in the disc cartridge 20, and the position in the disc rotation axis direction on the stabilization plane 23 is adjusted by controlling the position in the disc rotation axis direction in the disc cartridge 20. By adjusting the relative distance between the spindle 3a and the stabilizing plane 23 in the disc rotation axis direction, the stabilizing plate 23 is allowed to act properly on the optical disc, and the surface deflection of the optical disc 1 is caused as in the first to third embodiments. Stabilize.

  Next, the operation of each embodiment will be described.

  Various experiments were conducted and studied on the phenomenon in which aerodynamic force is applied to the rotating recording disk by a stabilizing plate on the plane (stabilizing plane), which is the basic operation in each of the above embodiments. However, there is a specific relationship between the "distance between the disc and the stabilizing plate" and the "disk rotation speed" and the stability of the disc surface. It is very important to properly adjust these relationships to stabilize the air in the disc. Found it important.

  The “distance between the disc and the stabilization plate” described above is the position of the surface of the optical disc 1 on the side of the stabilization plate 30 (fixed by sandwiching it with a hub) as shown in the schematic diagram around the center of the disc in FIG. The position of the contact surface between the hub and the disk, or the position of the contact surface between the spindle and the disk when the disk is directly fixed to the spindle chuck without using the hub, and the surface position of the stabilizing plate 30. It is the gap Cbd.

  Hereinafter, the importance of appropriately adjusting the relationship between “the distance Cbd between the disk and the stabilizing plate” and “the number of rotations Sr” will be described based on experimental data that has been earnestly studied.

  One of the important points found by the inventors' earnest study is that the “distance Cbd between the disc and the stabilizing plate” for stabilizing the disc is limited to a specific range. An example of the result is shown in FIG. FIG. 6 shows a change in surface runout stability in the radial direction of the disk when the “distance Cbd between the disk and the stabilizing plate” is changed.

  The surface runout stability changes remarkably when the “distance Cbd between the disc and the stabilizing plate” is around 0.4 mm, and the surface runout at the outer periphery of the disc exceeds 100 μm at 0.5 mm. Yes. This is an example at a specific rotation speed (6000 rpm), but there is an inflection point where the surface runout stability changes extremely in the “distance Cbd between the disk and the stabilization plate”. The disk rotation speed was changed. The case was almost common.

  As can be seen from FIG. 6, when the inflection point is exceeded, deterioration of the surface runout stability starts from the outer periphery of the disk. The fact that the suction force acting on the disk by the stabilization plate decreases as the distance from the stabilization plate is easily predicted as a physical phenomenon. When the “distance Cbd between the disk and the stabilization plate” is increased, The phenomenon that the surface runout stability is deteriorated can be explained by the fact that there is a limit to the range of the acting force of the stabilizing plate. However, as a result of intensive studies by the inventors, the most important point found out is that this phenomenon changes extremely with a specific “distance Cbd between the disk and the stabilizing plate” as a boundary.

  Further, the second point found by the inventors will be described below.

  The value of the “distance Cbd between the disc and the stabilizing plate” (hereinafter referred to as Cbdmax) at which the surface runout stability changes abruptly drawn a specific curve. Specifically, the phenomenon varies depending on the disk rotation speed, and shows a phenomenon that increases as the disk rotation speed increases in the low rotation area, and decreases as the disk rotation speed increases in the high rotation area.

  The outline of the curve is shown in FIG. FIG. 7 shows the range of “distance Cbd between the disc and the stabilization plate” in which the horizontal axis represents the disc rotation speed and the vertical axis represents the “distance Cbd between the disc and the stabilization plate”, and the disc can be stabilized by the stabilization plate. It is shown.

  The phenomenon that Cbdmax increases in the low-speed rotation region is considered to be because the acting force by the stabilizing plate is increased by increasing the flow velocity of the air flow generated in the vicinity of the disk surface as the disk rotation speed increases. In addition, the phenomenon that Cbdmax decreases in the high-speed rotation range is that the vibration in the disk rotation axis direction of the disk surface increases with the increase in the disk rotation speed. Since it is necessary, it is surmised that the disc surface run-out cannot be sufficiently suppressed unless the "distance Cbd between the disc and the stabilizing plate" is narrowed and the acting force of the stabilizing plate is increased. The

  The second point found by the inventors after earnest examination is that “Cbdmax shows different behaviors in the low and high rotation ranges of the disk rotation speed, and shows a specific profile with respect to the disk rotation speed. "There is.

  The inventors have found that the Cbdmax is represented by Cbdmax = 0.00015Sr + β in the low speed rotation region and Cbdmax = A / Sr + α in the high speed rotation region.

  The phenomenon in the low-speed rotation range is complicated, and Cbdmax varies due to the influence of subtle disk distortion at the time of disk chucking. However, the above equation takes this variation into consideration, and is expressed by this equation. If it was Cbdmax or less, the disk surface could be properly stabilized.

  Here, A, α, and β are arbitrary constants. A is a constant mainly determined by the disk base material, and has a value of about (1E3), and tends to take a small value for a disk base material having a large Young's modulus. For example, a polycarbonate having a Young's modulus of approximately 2.5 GPa has a value of A around 3500, and a polyethylene terephthalate having a Young's modulus of approximately 5.5 GPa has a value of around 2500.

  Further, α is a constant mainly determined by the film thickness of the disk base material, and has a value of about (1E-1), and tends to be larger as the film thickness is thicker. For example, when polycarbonate was used for the disk substrate, α was a value around −0.1, and varied depending on the disk film thickness.

  Β is a constant mainly related to the flatness of the recording disk and takes a value of approximately (1E-1), and tends to decrease as the distortion of the disk increases. For example, when polycarbonate is used for the disk base material, β takes a value of around +0.3, and decreases as the disk distortion increases.

  On the other hand, as shown in FIG. 7, the lower limit Cbdmin for stabilizing the disk surface also exists on the side where the “distance Cbd between the disk and the stabilizing plate” is decreased. This lower limit Cbdmin was limited by the contact / sliding phenomenon between the disk and the stabilizing plate. If the “distance Cbd between the disc and the stabilization plate” is too small, the disc and the stabilization plate may come into contact / slide, making it unsuitable for driving the recording / reproducing apparatus. What is important is that Cbdmin also changes depending on the number of disk revolutions in the same manner as Cbdmax. Cbdmin decreased as the disk rotation speed increased in the low-speed rotation region, and thereafter became a constant value. This “Cbdmin shows a specific profile with respect to the number of revolutions of the disk” is the third point found by the inventors as a result of intensive studies.

  Further, the inventors have found that this Cbdmin is represented by Cbdmin = γexp (−0.00004 Sr) in the low speed rotation region and Cbdmin = η in the high speed rotation region. γ, like β, is a constant mainly related to the flatness of the recording disk. γ takes a value on the order of (1E-1) and tends to increase as the disc distortion increases. For example, when polycarbonate is used for the disk base material, γ takes a value around +0.25, and becomes larger as the distortion of the disk increases.

  Similarly to β and γ, η is a constant mainly related to the flatness of the recording disk, and increases as the distortion of the recording disk increases. Actually, η takes a fixed value in the vicinity of about +0.05 unless the recording disk has a large distortion and the flatness of the recording medium is very large. In practice, this value is a representative value of η. A recording disk having a large η, that is, a large disk distortion, is not used for disk stabilization by a flat stabilizer, and it is practically necessary to use a disk having a small distortion.

  Based on the above-mentioned three points, a specific condition area for stabilizing the disk is determined by the plate-shaped stabilizer, and the disk can be stabilized by adjusting the conditions within this limited range. The range is specified by the inequality represented by Cbd ≦ A / Sr + α, Cbd ≦ 0.00015Sr + β, Cbd ≧ γexp (−0.0004Sr), Cbd ≧ η from the above-described relationship. As described above, A, α, β, γ, and η are arbitrary constants determined by the disk specifications such as the disk base material, thickness, and strain.

  The upper limit value of the disk rotational speed is basically limited by the inequality, but practically, it is necessary to consider the limit range of Sr ≦ Srmax determined by the rotational speed limit Srmax of the spindle motor 3. Depending on the disc specifications, this range may be the limit range of the stabilization condition. FIG. 7 shows a case where the upper limit of the disk rotational speed is limited by the limit rotational speed of the spindle motor 3.

  As described above, the specific condition area shown in FIG. 7 is very important in order to stabilize the disk with the flat stabilizer. Considering these points, the configuration of the apparatus, the driving method, and the configuration of the disc cartridge for stabilizing the disc in this specific condition range were considered.

  In the first to fourth embodiments, the apparatus configuration for recording / reproducing driving in the specific condition area is realized. In all of these embodiments, the relative position of the spindle 3a holding the optical disc 1 and the stabilizing plate 30 (23) is adjusted in the disc rotation axis direction. The purpose is to adjust the distance Cbd "between Cbdmin and Cbdmax.

  In order to stabilize the disc with the flat stabilizer, it is important to adjust the “distance Cbd between the disc and the stabilizer” within the specific condition range shown in FIG. To achieve this, the recording / reproducing apparatus of the above embodiment is used to store the adjustment pattern of the relative position with respect to the disk rotation speed, and the relative position according to the disk rotation speed during recording and / or reproduction. A driving method for adjusting (distance) is conceivable.

  As the adjustment pattern, for example, as shown in FIG. 8, for example, an adjustment pattern 1 that continuously changes the “distance Cbd between the disc and the stabilizing plate” with respect to the disc rotation speed, or an adjustment pattern 2 that changes stepwise. Such a pattern is conceivable, and either can be used to achieve the effect sufficiently.

  It is also possible to store a plurality of adjustment patterns when the disk configuration is changed, and to execute a method of selecting the adjustment pattern according to the disk configuration. It is possible to respond quickly and easily.

  Furthermore, when various experiments were performed, when the disc was properly stabilized by the stabilizing plate 30 (23), the tilt angle in the disc radial direction of the outer periphery of the disc was close to zero, that is, the disc surface was It became clear that it became level.

  FIG. 9 shows the disk shape in the disk radial direction when the disk surface is properly stabilized and when it is not. The smaller radial inclination of the disk outer peripheral part is the result when proper stabilization is performed, and the other is the result when proper stabilization is not performed. The tilt angle here is the inclination of the disk surface in the radial direction of the disk with respect to the horizontal plane (the plane perpendicular to the disk rotation axis), and the positive and negative directions are the directions shown in the figure.

  Based on this result, the recording / reproducing apparatus provided with the tilt angle detecting mechanism and the driving method thereof were considered. For example, if the tilt angle is adjusted to a specific range of −0.1 to +0.1 deg, the surface runout stability on the entire disk surface can be reduced to 20 μm or less as shown in FIG.

  FIG. 10 shows the relationship between the tilt angle at the disc outer periphery 50 mm position detected by the tilt angle detection sensor 6 shown in FIG. 11 and the surface runout stability for optical discs having two different disc specifications (the black circles in FIG. 10). (Detection data value of disk specification with black mark and black square mark)

  12A and 12B are diagrams showing a configuration example of a disk cartridge used in the third and fourth embodiments. FIG. 12A is a plan view, and FIG. 12B is a cross-sectional view.

  In FIG. 12, the members described in FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 12, the spindle 3a is inserted in order to attach the spindle 3a to the optical disk 1 in the disk cartridge 20. It is an opening for making it.

  In the operation of the apparatus according to the present embodiment, the planar accuracy of the stabilizing plate, the mounting accuracy of the stabilizing plate to the housing of the device body, the mounting accuracy of the spindle to the housing, the shape accuracy of the disk center hub, etc. There are many parts that ensure the accuracy in setting the “distance Cbd between the disk and the stabilization plate” with high accuracy. Although it depends on the part, it is desirable that this part shape accuracy and assembly intersection be within a range of approximately ± 0.01 mm.

  Effectively, the disk surface on the stabilization plate side with the disk mounted on the spindle (if the disk is fixed by holding it with a hub, the contact surface between the hub and the disk, or the disk on the spindle chuck without using the hub) When directly fixed, the maximum inclination of the spindle-disk contact surface and the stabilizing plate surface is 0.1 deg or less, and the relative position adjustment error in the disk rotation axis direction is ± 0.02 mm or less. It is desirable that

  Further, in the present embodiment, a device that does not hinder the behavior of air flowing on the disk surface is necessary. This point will be described below using the disk cartridge 20 containing the optical disk 1 as an example.

  FIG. 13 is a schematic cross-sectional view showing a state in which the disc is stabilized by a stabilization plane in the disc cartridge. 25 is an intake port, 26 is an exhaust port, and 31 is an air flow.

  In FIG. 13, when the optical disc 1 is rotated, an air flow 31 that basically goes from the inner circumference to the outer circumference is generated on both sides of the disc, and this air flow 31 is also used in the stabilization of the optical disc 1 by the stabilization plane 23. Plays an important role. In order not to obstruct the air flow 31 from the inner periphery to the outer periphery of the disk, for example, in the disk cartridge 20 of FIG. 12, an air inlet 25 is formed in the center to introduce air into the disk cartridge 20 from the outside. In addition, an exhaust port 26 is formed so that air flowing from the inner periphery to the outer periphery of the disc is smoothly exhausted out of the disc cartridge 20 at the outer periphery of the disc. Further, the opening 24 for fixing the optical disc 1 to the spindle 3a functions as an air inlet on the opposite side to the air inlet 25.

  As described above, the air flow 31 whose inner periphery is directed toward the outer periphery smoothly flows on both surfaces of the optical disc 1. In the disc cartridge 20 shown here, 16 exhaust ports 26 are formed at the outer peripheral position obtained by dividing the circumference into 16 parts. Here, at least the air inlet 25 and the opening 24 of the disk cartridge 20 must be provided with a filter for preventing dust, dust, and the like from entering the disk cartridge 20 from the outside, and the exhaust port. 26 is preferably provided with a similar filter. Further, the concept of controlling the air flow 31 is not limited to the disk cartridge 20, and it is necessary to give the same consideration to the configurations as in the first and second embodiments.

  FIG. 14 is a block diagram showing a configuration of a control system in the recording / reproducing apparatus according to the present embodiment, and each part is controlled by a CPU (central processing unit) 50.

  In FIG. 14, reference numeral 51 denotes a spindle motor drive / control unit that drives / controls the spindle motor 3 based on control data from the CPU 50, and 52 similarly receives the control data and performs seek operation, recording / reproduction operation, focus / reproduction operation of the optical pickup 4. An optical pickup driving / control unit for driving and controlling the tracking control, 53 is a moving stage driving / control unit for driving / controlling the moving stage 40 (43, 47) in response to the control data, 54 is a predetermined operation of the entire apparatus, A ROM ROM 55 in which a control program is stored is a memory RAM 55 in which various setting programs are stored.

  An outline of the flow from the disk stabilizing operation to the recording / reproducing operation by the optical disk stabilizing plate in the recording / reproducing apparatus of Embodiments 1 to 4 will be described with reference to the flowchart of FIG.

  First, the optical disk 1 is set on the spindle chuck 5 via the hub 2 and held on the spindle 3a (S1). When the start switch is turned on, the CPU 50 outputs a drive signal to the spindle motor drive / control unit 51, The spindle motor 3 is started and the optical disk 1 is rotated at a desired rotational speed (S2).

  Thereafter, in step (S3), the “distance Cbd between the disk and the stabilizing plate” corresponding to the rotational speed of the spindle motor 3 is set to a predetermined value (the state shown in FIG. The relationship between the rotational speed of the spindle motor 3 and the “distance Cbd between the disc and the stabilizing plate” is tested in advance for each specification and configuration of the optical disc 1 to be used. This related data is stored as a data table in the RAM 55 or the like, and the CPU 50 reads the data from the RAM 55 as appropriate to perform the set control drive of the distance Cbd.

  Specifically, by outputting a control signal based on the data from the moving stage driving / control unit 53, in the first and third embodiments, the position of the spindle 3a in the disk rotation axis direction is controlled by the moving stage 40, and the positioning is performed. The final position is determined by the mechanism 41. In the second embodiment, the position of the stabilizing plate 30 in the disk rotation axis direction is controlled by the moving stage 43, and the final position is determined by the positioning mechanism 44. In the fourth embodiment, the position of the disk cartridge 20 in the disk rotation axis direction is controlled by the moving stage 47 and the final position is determined by the positioning mechanism 47.

  After the setting in step (S3) is completed, the tilt angle detection sensor 6 detects the tilt angle of the optical disc 1, and the CPU 50 that has received the detection data moves the moving stages 43 and 47 through the moving stage drive / control unit 53. It is driven so that the tilt angle of the optical disc 1 is zero or falls within a predetermined allowable range (S4).

  Thereafter, the optical pickup 4 is moved to a radial position where recording / reproducing is performed on the optical disc 1, and a focus servo operation is performed by adjusting a disc rotation axis position in the optical pickup 4. Control to fit. Tracking servo is applied to the optical pickup 4 to cause the optical pickup 4 to follow the target groove or pit on the optical disc 1 (S5). In this state, a predetermined recording or reproducing operation is executed (S6).

  As shown in the figure, it is desirable to adjust Cbd by the operations of both steps S3 and S4. However, basically, it is possible to adjust Cbd by only one of the operations, for example, The drive angle can be simplified by omitting the tilt angle detection mechanism, and even in this case, the effects of the present invention are sufficiently possible.

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

Example 1
In Example 1, the recording / reproducing apparatus of Embodiment 1 shown in FIG. 1 was used.

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 a disk, first, a groove having a stamper pitch of 0.6 μm and a width of 0.3 μm is transferred to the sheet by thermal transfer, and then a sheet / Ag reflective 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 10 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 optical disc 1 was almost flat.

  By rotating the optical disc 1 in the range of 1000 to 12000 rpm and adjusting the position of the spindle 3a in the disc rotation axis direction according to the adjustment pattern shown in FIG. 16, the “distance Cbd between the optical disc 1 and the stabilizing plate 30” is adjusted. At this time, the disc surface runout at the disc radius of 25 to 55 mm was evaluated by a laser displacement meter arranged in place of the optical pickup 4.

(Example 2)
Also in Example 2, the recording / reproducing apparatus of Embodiment 1 shown in FIG. 1 was used.

In Example 2, 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 is transferred to the sheet by thermal transfer, and then the 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.

  By rotating the optical disk 1 in the range of 1000 to 14000 rpm and adjusting the position of the spindle 3a in the disk rotation axis direction according to the adjustment pattern shown in FIG. 17, the “distance Cbd between the optical disk 1 and the stabilizing plane 23” is adjusted. In this case, the disc surface fluctuation at the disc radius of 25 to 55 mm was evaluated by a laser displacement meter arranged in place of the optical pickup 4.

(Example 3)
In Example 3, the recording / reproducing apparatus of Embodiment 4 shown in FIG. 4 was used. Further, the optical disk 1 having the same configuration as that of Example 1 was used.

  Then, the optical disk 1 is rotated in the range of 1000 to 12000 rpm, and the position of the disk cartridge 20 in the disk rotation axis direction is adjusted by the moving stage 47 according to the adjustment pattern shown in FIG. The distance Cbd ”was adjusted, and the disc surface runout at the disc radius of 25 to 55 mm at this time was evaluated by a laser displacement meter arranged in place of the optical pickup 4.

Example 4
In Example 4, the recording / reproducing apparatus of Embodiment 2 shown in FIG. 2 was used. Further, the optical disk 1 having the same configuration as that of Example 1 was used. Further, a tilt angle detection sensor 6 shown in FIG. 11 is employed. The tilt angle detection sensor 6 is arranged so as to detect the tilt angle in the radial direction of the disc surface at a radius of 50 mm from the outer periphery of the disc.

  Then, by rotating the optical disc 1 in the range of 1000 to 12000 rpm and adjusting the disc rotation axis direction position of the stabilization plate 30 with the moving stage 43, the “distance Cbd between the optical disc 1 and the stabilization plate 30” is adjusted. In this case, the disc surface fluctuation at the disc radius of 25 to 55 mm was evaluated by a laser displacement meter arranged in place of the optical pickup 4. In this adjustment, the value of the tilt angle detected by the tilt angle detection mechanism is set to −0.1 deg or more.

(Comparative Example 1)
In Comparative Example 1, as shown in FIG. 19, a recording / reproducing apparatus that does not include a moving stage and a supporting member was used. The same optical disk 1 as in Example 1 was used.

  Then, the optical disc 1 was rotated in the range of 1000 to 12000 rpm, and the disc surface runout at the disc radius of 25 to 55 mm was evaluated by a laser displacement meter arranged in place of the optical pickup 4. “Distance Cbd between disk and stabilizing plate” was fixed to 0.5 mm.

(Comparative Example 2)
Also in Comparative Example 2, the recording / reproducing apparatus shown in FIG. 19 was used. Further, the optical disk 1 having the same configuration as that of Example 2 was used.

  Then, the optical disc 1 was rotated in the range of 1000 to 12000 rpm, and the disc surface runout at the disc radius of 25 to 55 mm was evaluated by a laser displacement meter arranged in place of the optical pickup 4. “Distance Cbd between disk and stabilizing plate” was fixed to 0.5 mm.

  In this example and the comparative example, the surface runout characteristic of the optical disc 1 stabilized by the flat stabilizer is as shown in FIG. As shown in this result, in this example, good disk surface runout characteristics were obtained over a wide range of disk rotation speeds. In addition, when the rotational speed of Example 4 was in the range of 2000 rpm or less, the control of Cbd by tilt angle detection did not converge, so the disk could not be stabilized, but in the rotational speed range of 4000 rpm or more. Good stability could be obtained.

  In this example, the difference in effect was obvious compared with the comparative example, and it was understood that the effect in the present invention was enormous. In the comparative example, the case where Cbd was fixed to 0.5 mm without performing Cbd adjustment was verified. In Comparative Example 1 and Comparative Example 2, attempts were made to stabilize optical discs having different specifications. However, the disc rotation speed range in which any of the optical discs can be stabilized is narrow and not practical.

  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. All of the disk-shaped recording disks such as phase change memory, magneto-optical memory, and hologram memory can be targeted.

Schematic of the principal part for describing Embodiment 1 of the recording / reproducing apparatus based on this invention Schematic of the principal part for describing Embodiment 2 of the recording / reproducing apparatus based on this invention Schematic of the principal part for explaining Embodiment 3 of the recording / reproducing apparatus concerning this invention Schematic of the principal part for explaining Embodiment 4 of the recording / reproducing apparatus concerning this invention Schematic diagram around the center of the disk for explaining the present embodiment The figure which shows the change of the surface runout stability over a disk radial direction at the time of changing "the distance between a disk and a stabilization board" concerning this embodiment. The figure which shows the specific curve of value Cbdmax of the "distance Cbd between a disc and a stabilization board" where the surface runout stability which changes rapidly concerning this embodiment is changed. The figure which shows the conditions (adjustment pattern) in which the extremely small disc surface run-out characteristic is acquired on the whole disc surface in the specific area | region within the stabilization condition range which concerns on this embodiment. Illustration of the disk shape in the disk radial direction when the disk surface is properly stabilized and when it is not The figure which shows the relationship between the tilt angle in the optical disc of two different disc specifications, and a surface runout stability Schematic showing an installation example of a tilt angle detection sensor in the present embodiment The figure which shows the structural example of the disk cartridge used in Embodiment 3, 4. Schematic sectional view showing a state in which the disc is stabilized by a stabilization plane in the disc cartridge according to the present embodiment. 1 is a block diagram showing a configuration of a control system in a recording / reproducing apparatus according to the present embodiment. Flowchart from disc stabilization operation to recording / reproduction operation in this embodiment The figure which shows the example of the Cbd adjustment value employ | adopted in a present Example The figure which shows the example of the Cbd adjustment value employ | adopted in a present Example The figure which shows the test result of the disk surface runout characteristic in a present Example and a comparative example Schematic of the configuration of the comparative example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Hub 3 Spindle motor 3a Spindle 4 Optical pick-up 5 Spindle chuck 6 Tilt angle detection sensor 10 Apparatus main body housing 20 Disk cartridge 21 Guide member 23 Stabilization plane 30 Stabilization plates 40, 43, 47 Moving stages 42, 45, 46 Support member Cbd Gap between the lower surface of the optical disk and the surface of the stabilizing plate

Claims (9)

A flexible recording disk is fixed to a spindle and rotated, and a stabilizing plate that applies an aerodynamic force suppresses and stabilizes the disk surface shake of the flexible recording disk, thereby recording. In a recording / reproducing apparatus for recording and / or reproducing information on the recording disk by scanning a reproducing head,
The stabilizing plate is a flat plate covering at least the recording area of the recording disk,
A recording / reproducing apparatus comprising position adjusting means for adjusting a relative distance between the spindle and the stabilizing plate in a disc rotation axis direction.   2. The recording / reproducing apparatus according to claim 1, wherein the position adjusting means is provided on the spindle.   2. The recording / reproducing apparatus according to claim 1, wherein the position adjusting means is provided on the stabilizing plate.   4. The recording / reproducing apparatus according to claim 1, further comprising a tilt detection unit that detects a tilt angle in a disc radial direction of the outer periphery of the recording disc. A driving method used in the recording / reproducing apparatus according to claim 1,
An adjustment pattern of a relative position in the disk rotation axis direction between the spindle and the stabilizing plate with respect to the disk rotation speed is stored, and the relative position is adjusted according to the disk rotation speed during recording and / or reproduction. Driving method of recording / reproducing apparatus.   6. The recording / reproducing apparatus according to claim 5, wherein a plurality of the adjustment patterns when the configuration of the recording disk is changed are stored, and the adjustment patterns are selected according to the configuration of the recording disk to be used. Driving method.   6. The recording according to claim 5, further comprising tilt detecting means for detecting a tilt angle in a disk radial direction of the outer periphery of the recording disk, wherein the relative position is adjusted so that the detected tilt angle is close to zero. / Driving device drive method.   8. The driving method of a recording / reproducing apparatus according to claim 7, wherein the maximum value of the tilt angle is adjusted to -0.1 deg or more and +0.1 deg or less. A flexible recording disk is fixed to a spindle and rotated, and a stabilizing plate that applies an aerodynamic force suppresses and stabilizes the disk surface shake of the flexible recording disk, thereby recording. Recording / reproducing apparatus provided with position adjusting means for recording and / or reproducing information on the recording disk by scanning the reproducing head and adjusting the relative distance between the spindle and the stabilizing plate in the direction of the disk rotation axis A disc cartridge loaded and containing the recording disc,
A disc cartridge characterized in that the stabilizing plate has a flat plate shape covering at least a recording area of the recording disc and is installed on an inner wall of the cartridge.

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