JP2009004071A - Recording and reproducing method and recording and reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and surely performing the pull-in of focus control, in focus control for a flexible optical disk. <P>SOLUTION: A stabilizing member 6 is brought close to an optical disk 1 by a first stabilizing member positioning part 12. A gap Cbd between the optical disk 1 and the stabilizing member 6 is set to a value which generates a disk surface wobbling of 10 to 100 μm as a first operation control mode. An optical beam L is emitted from an optical pickup 4, and an objective lens 5 is brought close to the optical disk 1 to detect a focus error signal. In this state, an S-curve is clearly generated in the focus error signal because of large disk surface wobbling. Based on this S-curve, focus servo pull-in is started by a focus servo pull-in part 11, and a focus servo operation of an optical spot S on the optical disk 1 is performed by a focus servo part 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a recording / reproducing method for performing at least one of recording and reproduction on a thin recording disk having flexibility, and a recording / reproducing apparatus that realizes the recording / reproducing method. The present invention relates to a focus control pull-in technique.

Reproduction or write-once and rewritable optical discs such as CD, DVD, or optical discs using blue-violet laser (Blu-ray, HD-DVD), which are commonly used, are made of polycarbonate resin with a disc diameter of 120 mm and disc thickness of 1.2 mm It is comprised by the board | substrate of. The optical disc, when rotationally driven by common drive device, surface deflection amount in the vicinity of the disk outermost reaches _{50μm P-P ~300μm P-P} .

  In an optical disk recording / reproducing apparatus, an optical pickup is mounted together with a disk drive device to record / reproduce data on / from an optical disk. The optical pickup condenses a light beam while applying focus control to the optical recording disk. The spot is irradiated, the optical information of the reflected beam from the recording disk is received by an optical element, and a reproduction signal or a control signal is detected.

  In the focus control, control pull-in is initially performed. At this time, the S-curve of the focus error signal is determined, and thereby focus control pull-in is performed. For example, the operation at the time of drawing as shown in the flowchart of FIG. 7 is executed.

  In FIG. 7, after the optical disk is loaded into the disk drive device (S1), the optical disk is driven to rotate (S2), and the objective lens for condensing the light beam in the optical pickup is brought close to the optical disk, and the optical beam is irradiated onto the optical disk. In this state, the optical disc has the surface shake of the above-described surface shake amount, and therefore, the detected focus error signal has an S-shaped voltage waveform centered on the focal point (S3: FIG. 8 ( S-curve as shown in a). The S-curve is determined to detect the zero cross point, and thereby focus control is pulled in (S4).

  Thereafter, predetermined focus control is executed (S5), tracking control is executed (S6), and recording / reproduction of data with respect to the optical disc is started in a stable state (S7).

By the way, as described in Patent Document 1, a flexible optical disk developed in recent years is used, and surface vibration is suppressed by applying an aerodynamic force to the optical disk by a stabilizing member. in the optical disk recording and reproducing apparatus that, when the thin optical disk of thickness 0.08Mm～0.2Mm, although the surface deflection amount increases as toward the outermost of innermost periphery disc, 1μm _P-P ~ at maximum 10μm a _P-P, the result in that amount of about 1 / 10-1 / 300 in comparison with the surface deflection of a conventional optical disk, the surface deflection amount is significantly suppressed.

In focus control for such a flexible optical disk, as described in Patent Document 2, in order to obtain an S-shaped curve, the amount of protrusion of the stabilizing member with respect to the optical disk is varied, and a focus error signal is generated. A technique is proposed in which focus control is performed after determining the S-curve and raising the height.
JP 2006-107698 A JP 2002-358759 A

  As described in Patent Document 1, in a configuration in which surface vibration is suppressed by a stabilizing member for a thin optical disk having flexibility, a steady focus control operation after pulling in the focus control is steady. Disturbance that occurs automatically can be reduced, and in particular, the amount of focus error at the time of high-speed rotation of the optical disk is reduced, and a favorable focus control operation at the time of high-speed rotation is realized.

However, since the time of focus control, also be close to the same manner as heretofore objective lens to the optical disk, the surface deflection amount is 1μm _P-P ~10μm _P-P at the maximum as the focus error resulting from surface deflection It is difficult for the S-curve of the signal to appear, and as shown in FIG. 8B, the frequency is extremely small and the frequency is low. Therefore, there is a problem that it is difficult to pull in the focus control.

  In addition, as described in Patent Document 2, in the method in which the protruding amount of the stabilizing member with respect to the optical disc is shaken to determine the S-curve of the focus error signal and the height is raised, stabilization is performed before focus control is applied. Since there is an operation of swinging the protruding amount of the member with respect to the optical disk, there is a possibility that the protruding amount may cause contact with the optical disk, and an S-curve may not be generated reliably.

  The present invention has been made in view of the above-mentioned problems of the prior art, and provides a recording / reproducing method and a recording / reproducing apparatus capable of easily and surely pulling in focus control even with a flexible optical disc. The purpose is to provide.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that the recording disk having flexibility is rotated by a driving means, and the stabilizing member for applying an aerodynamic force to the recording disk is used. By stabilizing the surface fluctuation of the recording disk so that it is within the focus allowable surface fluctuation range, and condensing the light beam while applying focus control and irradiating the recording disk with a light spot, In a recording / reproducing method for performing at least one of information recording and reproduction, when the focus control is pulled into the light spot, a surface shake larger than a focus allowable surface shake when the recording disk is in the stabilized state is generated. Set to the first motion control mode and focus error in the first motion control mode S-curve is generated, and the focus control is pulled in based on the determination of the S-curve, and after the focus control is pulled in, the second operation control mode for executing the focus control is set, and the second operation In the control mode, at least one of recording and reproduction of information with respect to the recording disk is performed. By this method, the surface shake once out of the focus allowable surface shake range of the recording disk is once set before the focus control is pulled. By setting each part so as to occur, an S-curve appears reliably in the focus error signal with high frequency. In addition, the disc surface shake in the first operation control mode is about 10 to 100 μm, which is smaller than the value of 500 μm or more, which is the disc surface shake in the natural state, so that the disc and the objective lens do not come into contact with each other. it can. Then, after the focus control has been pulled in reliably and accurately, each part is set so that the surface runout of the recording disk is within the focus allowable surface runout range. The recording / reproducing operation is performed satisfactorily.

  According to a second aspect of the present invention, in the recording / reproducing method according to the first aspect, the gap between the recording disk and the stabilizing member in the first operation control mode is set larger than the gap in the second operation control mode. By this method, before the focus control is pulled, the stabilizing member is moved to a non-optimal position where the surface vibration suppression action is weak. Can be generated.

  According to a third aspect of the present invention, in the recording / reproducing method according to the first aspect, the rotational speed of the recording disk in the first operation control mode is set lower than the speed in the second operation control mode. By this method, it is possible to cause the recording disc to run out of the focus allowable surface run-out range by reducing the disc rotation speed before pulling in the focus control.

  According to a fourth aspect of the present invention, in the recording / reproducing method of the first aspect, the gap between the recording disk and the stabilizing member in the first operation control mode is set larger than the gap in the second operation control mode. The rotational speed of the recording disk in the first operation control mode is set lower than the speed in the second operation control mode, and this method stabilizes the recording disk before pulling in the focus control. By appropriately adjusting the gap with the member and the disk rotation speed, it is possible to more reliably cause the recording disk to run out of the focus allowable surface shake range before pulling in the focus control.

  According to a fifth aspect of the present invention, there is provided a drive unit for rotating a flexible recording disk and an aerodynamic force acting on the recording disk so that the surface deflection of the recording disk is a focus allowable surface deflection range. A stabilizing member that stabilizes the optical disc so as to be within the optical disc, an optical pickup that focuses the light beam while applying focus control, and irradiates the recording disc with a light spot, and receives optical information from the optical pickup. A recording / reproducing apparatus including a recording / reproducing unit that performs at least one of recording and reproduction of information with respect to the recording disk, and when the focus is pulled into the light spot, the recording disk is in the stabilized state. The first control mode is set to the first operation control mode for generating the surface shake larger than the focus allowable surface shake. A setting unit; a focus control pull-in unit that generates an S-curve of a focus error signal in the first operation control mode and pulls in focus control based on the determination of the S-curve; And a second control mode setting unit for setting the second operation control mode for executing the focus control. With this configuration, the recording is temporarily performed by the first control mode setting unit before the focus control is pulled in. By making the surface runout outside the focus allowable surface runout range of the disc, it is possible to ensure that the S-curve appears in the focus error signal, and the focus control is pulled in reliably and accurately. Later, the second control mode setting unit causes the surface deflection of the recording disk to be within the focus allowable surface deflection range. By setting each unit to so that, desired recording reproducing operation on the recording disk having flexibility is favorably performed.

  According to a sixth aspect of the present invention, in the recording / reproducing apparatus according to the fifth aspect, the first control mode setting unit is configured such that a gap between the recording disk and the stabilizing member in the first operation control mode is the second operation control mode. It is characterized by a positioning part that installs a stabilizing member at a position larger than the gap at the time, and this structure stabilizes the non-optimal position with weak surface vibration suppression action before pulling in focus control By moving the adjusting member, it is possible to cause a surface runout outside the focus allowable surface runout range on the recording disk.

  According to a seventh aspect of the present invention, in the recording / reproducing apparatus according to the fifth aspect, the first control mode setting unit determines the rotational speed of the recording disk in the first operation control mode from the speed in the second operation control mode. The rotation control unit is set to a low value.With this configuration, the disc rotation speed is lowered before pulling in the focus control, so that the recording disc has a surface runout outside the focus allowable surface runout range. Can be generated.

  According to an eighth aspect of the present invention, in the recording / reproducing apparatus according to the fifth aspect, the first control mode setting unit is configured such that the gap between the recording disk and the stabilizing member in the first operation control mode is the second operation control mode. A positioning unit that installs the stabilizing member at a position that is larger than the clearance of the time, and a rotation control unit that sets the rotation speed of the recording disk in the first operation control mode to be lower than the speed in the second operation control mode; With this configuration, before the focus control is pulled in, the gap between the recording disk and the stabilizing member and the disk rotation speed are appropriately adjusted, so that the focus control can be more reliably performed before the focus control is pulled in. It is possible to cause a surface runout outside the focus allowable surface runout range on the recording disk.

  According to the present invention, before the focus control is pulled into the thin recording disk having flexibility, each part such as the stabilizing member is set so that the surface deflection outside the focus allowable surface deflection range of the recording disk is once generated. As a result, by making sure that the S-curve appears in the focus error signal, the focus control can be pulled in reliably and accurately. After the pull-in, the desired recording / reproducing operation with respect to the recording disk can be performed satisfactorily by setting each part such as a stabilizing member so that the surface fluctuation of the recording disk is within the focus allowable surface fluctuation range.

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

(Embodiment 1)
FIG. 1 is a schematic configuration diagram of a recording / reproducing apparatus for explaining Embodiment 1 of the present invention, in which 1 is an optical disc that is a flexible recording disc, 2 is a hub that holds the rotation center of the optical disc 1, 3 is a spindle motor that rotationally drives the optical disk 1, 4 is moved in the radial direction of the optical disk 1, condenses the light beam L, irradiates the recording surface of the optical disk 1 as a light spot S, and performs optical scanning on the optical disk 1. 5 is an objective lens that is provided on the optical pickup 4 and condenses the emitted light beam L, and 6 is placed opposite to the recording surface of the optical disk 1 so that the optical disk 1 rotates at high speed. 1 is a planar plate-like (or curved plate) stabilization member that applies an aerodynamic force to 1 to suppress disc surface deflection.

  The “curved plate” refers to, for example, the optical pickup 4 accessing (feeding) the optical disc 1 as described in Japanese Patent Application Laid-Open Nos. 2007-80336 and 2007-149911. A plate that curves left and right with respect to the tangential direction. Further, the stabilizing member 6 does not necessarily need to coincide with the curved center line and the tangent line accessed by the optical pickup 4, and has a slight angle (for example, 10 degrees) in order to suppress the surface shake of the optical disc 1. It does not matter.

  Reference numeral 7 denotes a recording / reproducing unit that performs at least one of information recording and reproduction on the optical disc 1, and outputs a signal related to information to be recorded on the optical pickup 4 or an optical disc detected by the optical pickup 4. In response to an optical change signal in the reflected light from 1, a reproduction signal is output. Reference numeral 8 denotes a rotation control unit that controls the rotation speed of the spindle motor 3. In this example, the rotation control unit 8 sets the steady rotation speed of the optical disc 1 at the time of recording and reproduction to 15000 rpm. Reference numeral 9 denotes a CPU (central processing unit) that controls each part of the apparatus.

  A focus servo unit 10 performs focusing on the optical disc 1 of the objective lens 5 provided in the optical pickup 4, and 11 determines an S-curve generated in a focus error signal detected by the optical pickup 4, thereby It is a focus servo pull-in section that performs pull-in.

  No. 12, when the focus servo is pulled in, the stabilizing member 6 is moved to a position where a surface shake larger than the focus allowable surface shake when the surface shake is suppressed and stabilized in the optical disc 1 (first operation). (Control mode) It is a 1st stabilization member positioning part as a 1st operation control mode setting part to be made. The first stabilizing member positioning unit 12 includes, for example, a motor 15 that can be rotated forward and backward by control by a sequencer 14 that operates in response to a command from the CPU 9, as in the detailed configuration example shown in FIG. 9 based on FIG. The pinion gear 16 is fixed to the pin 18 at a constant height, and the rack gear 17 meshes with the pinion gear 16 and has an end fixed to the stabilizing member 6. Then, the rack gear 17 that meshes with the pinion gear 16 moves in either the upper or lower direction depending on the direction in which the pinion gear 16 rotates by receiving the rotational drive by the motor 15. The movement of the rack gear 17 raises and lowers the stabilizing member 6 to determine the amount of displacement, and the focus servo pull-in position (for example, a position of Cbd = 0.25 mm or more and 0.7 mm or less from a position away from the optical disk 1. Cbd is configured to move to the center height of the surface of the stabilizing member 6 close to the optical disc 1 and the height of the surface of the optical disc 1 close to the stabilizing member 6.

  13, when the focus state is stabilized by the focus servo, the stabilizing member 6 is moved to a position where the optical disc 1 is within the focus permissible surface wobbling range by the surface wobbling suppression action by the stabilizing member 6 (second operation control). It is the 2nd stabilization member positioning part as a 2nd operation control mode setting part made to mode. The second stabilizing member positioning unit 13 is controlled by a sequencer 14 that operates in response to a command from the CPU 9 as in the detailed configuration example shown in FIG. 9, for example, like the first stabilizing member positioning unit 12. The motor 15 includes a forward / reverse motor 15, a pinion gear 16 fixed to the base plate 18 at a constant height, and a rack gear 17 that meshes with the pinion gear 16 and has an end fixed to the stabilizing member 6. Then, the rack gear 17 that meshes with the pinion gear 16 moves in either the upper or lower direction depending on the direction in which the pinion gear 16 rotates by receiving the rotational drive by the motor 15. The movement of the rack gear 17 moves the stabilizing member 6 up and down to determine the amount of displacement, and from the focus servo pull-in position to a position where the amount of surface deflection of the optical disk 1 is minimized (for example, a position of Cbd = 0.1). It is configured to move.

  The focus servo pull-in operation and the like in the first embodiment having the above-described configuration will be described with reference to the flowchart of FIG.

  In FIG. 2, the optical disk 1 is loaded into the hub 2 of the apparatus before the focus control is pulled in during recording / reproduction (S1-1), and then the optical disk 1 is rotationally driven by the rotation control unit 8 (for example, the rotational speed is 2000 rpm). (S1-2). At this time, the stabilizing member 6 is at a standby position about 10 mm away from the optical disc 1, and the optical disc 1 is not in contact with the peripheral members including the stabilizing member 6.

  Next, the stabilization member 6 is brought close to the optical disc 1 by the first stabilization member positioning portion 12. The gap Cbd between the optical disc 1 and the stabilizing member 6 is set to a value (for example, Cbd = 0.3 mm) at which disc surface deflection of about 10 μm to 100 μm (maximum 300 μm) occurs in the first operation control mode (see FIG. 3). Set (S1-3). Here, a light beam (laser beam) L is emitted from the optical pickup 4, the objective lens 5 is brought close to the optical disc 1, and a focus error signal is detected. In this state, since the disc surface shake is large, an S-shaped curve is clearly generated in the focus error signal (S1-4). Based on this S-shaped curve, the focus servo pull-in unit 11 starts the focus servo pull-in (S1-5), and the focus servo unit 10 performs the focus servo operation of the light spot S on the optical disc 1 (S1-6).

In this state, since the deflection surface of the optical disc 1 is not in the proper value (the permissible focusing range 0μm the _{P-P ~10μm P-P)} , surface deflection of the optical disk 1, or axial runout acceleration becomes proper, also Thus, the stabilizing member 6 is brought close to the optical disc 1 by the second stabilizing member positioning unit 13 so that the amplitude level of the focus error signal becomes an appropriate value (minimum value) (S1-7). That is, as the second operation control mode, the gap Cbd is set to the operation region shown in FIG. 3 (for example, in this example, the gap Cbd for generating the surface runout of 5 μm is about 0.1 mm). In the second operation control mode, high-precision focus servo with few focus errors is executed by the high-speed rotation of the optical disc 1 and the action of the stabilizing member 6 (S1-8).

  Thereafter, tracking control normally executed in this type of apparatus is executed (S1-9), and data recording / reproduction with respect to the optical disk is started in a stable state (S1-10).

  As described above, according to the first embodiment, the focus servo can be surely pulled in the focus control for the thin optical disk 1 having flexibility in which the amount of surface deflection is reduced at the time of high-speed rotation by the action of the stabilizing member 6. High-speed data recording / reproduction can be performed stably.

(Embodiment 2)
FIG. 4 is a schematic configuration diagram of a recording / reproducing apparatus for explaining the second embodiment of the present invention. In the following description of each embodiment, members corresponding to those described with reference to FIG.

  The second embodiment is different from the first embodiment in that the first stabilizing member positioning portion 12 and the second stabilizing member positioning portion 13 are not provided, and the interval between the optical disc 1 and the stabilizing member 6 is set in advance. And a function as a first operation control mode setting unit that sets the rotation control unit 8 of the spindle motor 3 to a disk rotation speed (first operation control mode) that causes a surface shake larger than the focus allowable surface shake in the optical disc 1. And a function as a second operation control mode setting unit that sets the disc rotation speed (second operation control mode) so that the optical disc 1 is within the focus allowable surface deflection range when the focus state is stabilized by the focus servo. It has been made.

  The focus servo pull-in operation and the like in the second embodiment will be described with reference to the flowchart of FIG.

  In FIG. 5, after the optical disc 1 is loaded into the hub 2 of the apparatus so that the distance between the optical disc 1 and the stabilizing member 6 becomes a set value (for example, 0.25 mm) before pulling in the focus control during recording and reproduction ( S2-1), the rotation control unit 8 drives the optical disk 1 to rotate (S2-2), and the rotation speed is a value at which a disk surface runout of about 10 μm to 100 μm occurs (low speed: main) In the example, it is set to 2000 to 4000 rpm) (S2-3). Here, a light beam (laser beam) L is emitted from the optical pickup 4, the objective lens 5 is brought close to the optical disc 1, and a focus error signal is detected. In this state, since the disc surface shake is large, an S-shaped curve is clearly generated in the focus error signal (S2-4). Based on the S-curve, the focus servo pull-in unit 11 starts the focus servo pull-in (S2-5), and the focus servo unit 10 performs the focus servo operation of the light spot S on the optical disc 1 (S2-6).

In this state, since the deflection surface of the optical disc 1 is not in the proper value (the permissible focusing range 0μm the _{P-P ~10μm P-P)} , surface deflection of the optical disk 1, or axial runout acceleration becomes proper, also Thus, the rotation control unit 8 sets the rotation speed of the optical disc 1 as the second operation control mode so that the amplitude level of the focus error signal becomes an appropriate value (minimum value). The steady operation speed (high speed: 15000 rpm in this example) (S2-7). In the second operation control mode, high-precision focus servo with few focus errors is executed by the high-speed rotation of the optical disc 1 and the action of the stabilizing member 6 (S2-8).

  Thereafter, the tracking control normally executed in this type of apparatus is executed (S2-9), and data recording / reproduction with respect to the optical disk is started in a stable state (S2-10).

  Also in the second embodiment, as in the first embodiment, the focus servo is reliably pulled in the focus control for the thin optical disk 1 having flexibility, in which the amount of surface vibration is reduced during the high-speed rotation due to the action of the stabilizing member 6. Therefore, high-speed data recording / reproduction can be performed stably.

(Embodiment 3)
FIG. 6 is a flowchart relating to a focus servo pull-in operation according to the third embodiment of the present invention. The basic structure of the recording / reproducing apparatus of Embodiment 3 is the same as that shown in FIG.

  In FIG. 6, the optical disk 1 is loaded into the hub 2 of the apparatus before the focus control is pulled during recording / reproduction (S3-1), and then the optical disk 1 is driven to rotate by the rotation control unit 8 (S3-2). At this time, the stabilizing member 6 is at a standby position about 10 mm away from the optical disc 1, and the optical disc 1 is not in contact with the peripheral members including the stabilizing member 6.

  Next, as a first operation control mode, the stabilization member 6 is brought closer to the optical disc 1 by the first stabilization member positioning unit 12, and the rotation speed of the optical disc 1 is later stabilized by the rotation control unit 8. (S3-3). In this first operation control mode, the gap Cbd between the optical disk 1 and the stabilizing member 6 and the disk rotation speed are measured in advance as values at which disk surface runout of about 10 μm to 100 μm occurs.

  Here, a light beam (laser beam) L is emitted from the optical pickup 4, the objective lens 5 is brought close to the optical disc 1, and a focus error signal is detected. In this state, since the disc surface shake is large, an S-shaped curve is clearly generated in the focus error signal (S3-4). Based on the S-curve, the focus servo pull-in unit 11 starts the focus servo pull-in (S3-5), and the focus servo unit 10 performs the focus servo operation of the light spot S on the optical disc 1 (S3-6).

In this state, since the deflection surface of the optical disc 1 is not in the proper value (the permissible focusing range 0μm the _{P-P ~10μm P-P)} , surface deflection amount or axial runout acceleration of the optical disc 1 is the proper focus error As the second operation control mode, the second stabilizing member positioning unit 13 brings the stabilizing member 6 close to the optical disc 1 (in this example, the gap Cbd) so that the signal amplitude level is in an appropriate (minimum) stabilized state. Is set to about 0.1 mm), and the rotation control unit 8 sets the rotation speed of the optical disc 1 to a steady operation speed (high speed: 15000 rpm in this example) (S3-7). In the second operation control mode, high-precision focus servo with few focus errors is executed by the high-speed rotation of the optical disc 1 and the action of the stabilizing member 6 (S3-8).

  Thereafter, tracking control normally executed in this type of apparatus is executed (S3-9), and data recording / reproduction with respect to the optical disk is started in a stable state (S3-10).

  Also in the third embodiment, as in the first and second embodiments, a reliable focus servo is achieved in the focus control for the flexible thin optical disk 1 in which the amount of surface deflection is reduced at the time of high-speed rotation by the action of the stabilizing member 6. Therefore, high-speed data recording / reproduction can be stably performed.

  The configuration of each of the embodiments is selected and applied according to the specifications of the apparatus or the configuration of the optical disc.

  INDUSTRIAL APPLICABILITY The present invention is a focus control pull-in method in a recording / reproducing apparatus that uses a thin optical disk capable of high speed and large capacity, and an optical pickup that is applied as the apparatus and particularly used for recording and / or reproducing a thin optical disk. The present invention is effective when applied to a focus control device and a recording / reproducing apparatus including the focus control device in which the focus control is pulled in more stably during the focus drive of the optical head.

1 is a schematic configuration diagram of a recording / reproducing apparatus for explaining a first embodiment of the present invention. Flowchart related to focus servo pull-in operation and the like in the first embodiment The figure which shows the relationship between disc surface run-out and clearance gap Cbd at the time of disc rotation speed 4000rpm and 10000rpm in Embodiment 1. FIG. Schematic configuration diagram of a recording / reproducing apparatus for explaining Embodiment 2 of the present invention Flowchart related to focus servo pull-in operation and the like in the second embodiment A flowchart relating to a focus servo pull-in operation and the like according to the third embodiment of the present invention. Flow chart related to focus servo pull-in operation in an example of a conventional recording / reproducing apparatus (A), (b) is an explanatory diagram of the S-shaped curve of the focus error signal The block diagram which shows an example of the stabilization member positioning part in this embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 3 Spindle motor 4 Optical pick-up 5 Objective lens 6 Stabilizing member 7 Recording / reproducing part 8 Rotation control part 9 CPU (central processing unit)
DESCRIPTION OF SYMBOLS 10 Focus servo part 11 Focus servo drawing-in part 12 1st stabilization member positioning part 13 2nd stabilization member positioning part 14 Sequencer 15 Motor 16 Pinion gear 17 Rack gear 18 Base plate

Claims (8)

By rotating a flexible recording disk by a driving means and applying an aerodynamic force to the recording disk, the surface deflection of the recording disk is within the focus allowable surface deflection range. In a recording / reproducing method for performing at least one of recording and reproduction of information on the recording disk by stabilizing and condensing the light beam while applying focus control and irradiating the recording disk with a light spot ,
A first operation control mode for generating a surface shake larger than a focus allowable surface shake when the recording disk is in the stabilized state when the focus control is pulled into the light spot;
In the first operation control mode, an S-shaped curve of a focus error signal is generated, and focus control is drawn based on the determination of the S-shaped curve,
After pulling in the focus control, set to the second operation control mode for executing the focus control,
A recording / reproducing method, wherein at least one of recording and reproduction of information on the recording disk is performed in the second operation control mode.   2. The recording / reproducing method according to claim 1, wherein a gap between the recording disk and the stabilizing member in the first operation control mode is set larger than the gap in the second operation control mode.   2. The recording / reproducing method according to claim 1, wherein the rotational speed of the recording disk in the first operation control mode is set lower than the speed in the second operation control mode.   The gap between the recording disk and the stabilizing member in the first operation control mode is set larger than the gap in the second operation control mode, and the rotation of the recording disk in the first operation control mode 2. The recording / reproducing method according to claim 1, wherein a speed is set lower than the speed in the second operation control mode. A drive unit that rotates a recording disk having flexibility, and a stability that stabilizes the surface deflection of the recording disk within a focus allowable surface deflection range by applying an aerodynamic force to the recording disk. An optical pickup for condensing a light beam while applying focus control to irradiate the recording disk with a light spot, and recording information on the recording disk by receiving optical information from the optical pickup and In a recording / reproducing apparatus including a recording / reproducing unit that performs at least one of reproduction,
A first control mode setting unit for setting a first operation control mode for generating a surface shake larger than a focus allowable surface shake when the recording disk is in the stabilized state when the focus control is pulled into the light spot;
A focus control pull-in unit that generates an S-shaped curve of a focus error signal in the first operation control mode and performs focus control pull-in based on the determination of the S-shaped curve;
A recording / reproducing apparatus comprising: a second control mode setting unit configured to set a second operation control mode for executing the focus control after the focus control is pulled.   The first control mode setting unit is configured to position the stabilization member at a position where a gap between the recording disk and the stabilization member in the first operation control mode is larger than the gap in the second operation control mode. The recording / reproducing apparatus according to claim 5, further comprising a positioning unit for installing the recording medium.   The first control mode setting unit includes a rotation control unit that sets a rotation speed of the recording disk in the first operation control mode to be lower than the speed in the second operation control mode. The recording / reproducing apparatus according to claim 5.   The first control mode setting unit is configured to position the stabilization member at a position where a gap between the recording disk and the stabilization member in the first operation control mode is larger than the gap in the second operation control mode. And a rotation control unit that sets a rotation speed of the recording disk in the first operation control mode to be lower than the speed in the second operation control mode. The recording / reproducing apparatus according to claim 5.

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