WO2004025634A1 - High-density disk recording medium and a driving method thereof - Google Patents

High-density disk recording medium and a driving method thereof Download PDF

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Publication number
WO2004025634A1
WO2004025634A1 PCT/KR2003/001859 KR0301859W WO2004025634A1 WO 2004025634 A1 WO2004025634 A1 WO 2004025634A1 KR 0301859 W KR0301859 W KR 0301859W WO 2004025634 A1 WO2004025634 A1 WO 2004025634A1
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WO
WIPO (PCT)
Prior art keywords
disk
signal
focusing operation
objective lens
recording layer
Prior art date
Application number
PCT/KR2003/001859
Other languages
French (fr)
Inventor
Jin Yong Kim
Kyung Chan Park
Original Assignee
Lg Electronics Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lg Electronics Inc. filed Critical Lg Electronics Inc.
Priority to AU2003260993A priority Critical patent/AU2003260993A1/en
Publication of WO2004025634A1 publication Critical patent/WO2004025634A1/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0945—Methods for initialising servos, start-up sequences
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
    • G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only

Definitions

  • the present invention relates to a high-density optical disk such as a Blu-ray disk, and further to a driving method of preventing collision of an optical pickup's objective lens with a high-density disk in the event that the disk is placed upside down in a disk 10 recording/reproducing apparatus.
  • a compact disk is 1.2mm in thickness and 120mm in diameter as shown in Fig. 1.
  • a CD has a center hole of 15mm diameter and a clamping zone of
  • the objective lens for a CD has a numerical aperture (NA) of 0.45, which is relatively small.
  • a digital versatile disk usually called “DVD"
  • a DVD also has a center hole of 15mm diameter and a clamping zone of 44mm encircling the center hole.
  • a DVD When a DVD is normally placed into a disk device, its recording layer, which has pit patterns, is approximately 0.6mm from a surface confronting an objective lens of an optical pickup equipped in the disk device.
  • the objective lens for a DVD has a NA of 0.6, which is relatively large.
  • a new high-density disk e.g., Blu-ray disk (abbreviated as "BD” hereinafter), which is under development, is 1.2mm in thickness and 120mm in diameter, like a CD as shown in Fig. 3.
  • a BD also has a center hole of 15mm diameter and a clamping zone of 44mm encircling the center hole.
  • a BD is normally placed into a disk recording/reproducing apparatus, there will be a 0.1mm gap between its recording layer, which also has pit patterns, and a surface confronting an objective lens of an optical pickup for a BD, which has the largest NA of 0.85.
  • the optical pickup for a BD uses a laser beam of shorter wavelength than for a CD or a DVD to record or reproduce signals in high density.
  • a BD uses an objective lens that is situated closer to the recording layer, that uses a laser beam of shorter wavelength, and that has a greater NA. According to these conditions, it is possible to concentrate a stronger intensity of light on a smaller beam spot formed on the high-density pit patterns of the recording layer of a BD. Consequently, the transmitting distance of a laser beam of shorter wavelength is shortened.
  • a BD 10 is normally placed onto a turntable 11 installed in a disk device as shown in Fig. 4, a conventional servo-controlling operation for a spindle motor 12 by a motor driving unit 13 and a servo controller 15 is conducted to rotate the placed BD 10 at a constant and high speed. While the BD 10 is rotating, a focusing-servo operation is conducted to focus a laser beam for an optical pickup 14 exactly onto the recording layer 9. This operation is performed by moving the objective lens ⁇ OL' of the optical pickup 14 in an up and down direction within an operating distance OD' . If a laser beam is exactly in focus, then reproduction (or recording) of high-density pit patterns can be accomplished .
  • the BD 10 when the BD 10 is misplaced onto the turntable 11 by, for example, being placed upside down as shown in Fig. 5, the BD 10 will still be rotated at a constant and high speed by the combined servo-controlling operation by the spindle motor 12, the motor driving unit 13, and the servo controller 15. However, if the BD 10 has been placed upside down, the gap between the recording layer 9 and the objective lens ⁇ OL' of the optical pickup 14 is 1.1mm greater in comparison with a normally-placed BD.
  • a high-density recording medium structured in accordance with the present invention is characterized in that it comprises a disk having first and second surfaces, the disk including a recording area and a clamping area and defining a center hole for receiving a spindle therein; a recording layer coplanarly disposed in the disk, wherein the recording layer is in closer proximity to the first surface of the disk; and reflecting means placed on the second surface except an inner zone of the disk.
  • a method of driving a high-density optical disk in accordance with the present invention is characterized in that it comprises: conducting a focusing operation on a target area of a disk when the disk is placed; detecting a first signal produced by a reflected beam from a surface of the disk while the focusing operation is conducted; and stopping the focusing operation if a second signal to be produced by a reflected beam from a recording layer of the disk is not detected until a time elapsed from the detection of the first signal exceeds a preset interval.
  • Another method of driving a high-density optical disk in accordance with the present invention is characterized in that it comprises: conducting a focusing operation on a target area of a disk when the disk is placed; detecting a first signal produced by a reflected beam from a surface of the disk while the focusing operation is conducted; and stopping the focusing operation if a second signal having a predetermined level is not detected until an objective lens of an optical pickup that is moved by the focusing operation reaches a preset position.
  • the above-characterized high-density disk driving method provides means by which a disk recording/reproducing apparatus can prevent a high- density disk, an objective lens, and/or a servo-mechanism from irreparably damaged because of a collision of an optical pickup's objective lens with the high-density disk placed upside down.
  • Fig. 1 shows the structure of a conventional compact disk (CD) ;
  • Fig. 2 shows the structure of a conventional digital versatile disk (DVD)
  • Fig. 3 shows the structure of a conventional Blu-ray disk (BD) ;
  • Figs. 4 and 5 show normal placement and misplacement of a conventional BD, respectively;
  • Fig. 6 is a sectional view of, for example, a BD structured according to the present invention.
  • Fig. 7 shows misplacement of a high-density disk structured according to the present invention
  • Fig. 8 shows misplacement of a high-density disk with a reflecting film on entire surface of one side
  • Fig. 9 shows a flow diagram of a high-density disk driving method in accordance with the present invention.
  • Fig. 6 is a sectional view of a high-density disk structured according to the present invention.
  • the high- density disk for example, a BD 20 structured according to the present invention has same dimension as a conventional BD depicted in Fig. 3, namely, 1.2mm in thickness and 120mm in diameter, a center hole of 15mm diameter and a clamping zone (or clamping area) of 44mm encircling the center hole.
  • the BD 20 of the present invention has such a distinctive feature that a reflecting film 601 is formed on or a reflecting label is attached to a side opposite to which a recording layer is disposed in. As shown in Fig. 6, the reflecting film or label 601 covers the one side except a loop-shaped zone encircling the clamping area.
  • the loop-shaped zone which is opposite side of a lead-in area, is 45.2mm in inner diameter and 48mm in outer diameter.
  • a disk recording/reproducing apparatus generally tries to read signals written in the lead-in area first of all when a disk is placed therein.
  • the disk 20 structured as above is placed normally into a disk recording/reproducing apparatus as shown in Fig. 6, the disk surface which the reflecting film or label 601 is formed on or attached to is at the back of the recording layer with respect to the objective lens OL' of an optical pickup.
  • a disk recording/reproducing apparatus After successful clamping of the BD 20, a disk recording/reproducing apparatus, of which operation is explained with reference to Fig. 4, conducts a conventional servo-controlling operation, characterized by the operation of the spindle motor 12, the motor driving unit 13 and the servo controller 15, to rotate the normally-placed disk 20 at a constant and high speed, and to focus a laser beam exactly onto the lead-in area of the recording layer in order to read out navigation data. After the navigation data is obtained successfully, reproduction of data written on the recording layer can be performed based on the navigation data.
  • the disk surface which the reflecting film or label 601 is formed on or attached to is in front of the lead-in area of the recording layer with respect to the objective lens OL' of the optical pickup.
  • misplaced state of the BD 20 is totally same with normally-placed case from startup focusing point of view because there is no reflective means on the loop-shaped zone ranging 45.2mm to 48mm in diameter.
  • the reflecting film or label in front of a lead-in area with respect to an optical pickup reflects an incident beam much more than normal surface during start-up focusing, which leads easy judgment of misplacement.
  • the BD of Fig. 6 is misplaced as shown in Fig. 7, not reflecting means but disk surface reflects an incident beam because there is no reflecting means on a zone to which a beam is incident.
  • misplacement of a disk structured as Fig. 6 can not be determined based on difference of reflected beam intensity.
  • Fig. 9 is a flow chart of an embodiment of a method to determine misplacement of a high-density disk in accordance with the present invention.
  • the servo controller 15 conducts a focusing operation while rotating the placed BD 20 at a high speed.
  • the focusing operation moves upward the objective lens OL of the optical pickup below an inner zone, e.g., a lead-in area of the BD 20 to focus a laser beam exactly onto recording layer of the BD 20 (Sll) .
  • the servo controller 15 continues to detect an RF level ⁇ RF_dl' made by a reflected beam from the BD 20 (S12) and to compare the detected level ⁇ RF_dl' with a first preset reference ⁇ RF_Refl' to know whether the detected level RF_dl' is equal to the first reference RF_Refl' .
  • the servo controller 15 determines that an incident beam of the optical pickup 14 is exactly focused on the disk surface and starts to count time (S15) . While counting time, the servo controller 15 keeps moving the objective lens upward and detecting another RF level ⁇ RF_d2' made by the reflected beam (S15) .
  • the detected level RF_d2' is also compared by the servo controller 15 with a second preset reference
  • ⁇ RF_Ref2' that is RF level of a reflected beam when an incident beam is exactly focused on the recording layer of a BD. If the detected level RF_d2' becomes equal to the second reference ⁇ RF_Ref2' (S16), the servo controller 15 determines that the BD 20 is placed normally (S17), maintains the current focusing states and conducts the next servo operation (S18) .
  • the servo controller 15 determines that the BD 20 is placed upside down (S20) and immediately stops a current focusing operation (S21) .
  • the servo controller 15 also conducts the same operations such as focusing stop.
  • the above-explained disk misplacement determining method is also applicable to a conventional BD with no reflecting means on either side.

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  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

The present invention relates to a disk driving method to prevent collision of an optical pickup's objective lens with a high-density disk such as a blu-ray disk in the event that the disk is placed upside down in a disk device. In the present invention, a focusing operation for a lead-in area of the disk is conducted first when it is placed. While focusing operation is conducted a first signal produced by a reflected beam from the surface of the disk is detected. If a second signal produced by a reflected beam from a recording layer of the disk is not detected within a preset time after the first signal is detected, the focusing operation is stopped immediately to prevent collision of an optical pickup's objective lens with a high-density disk.

Description

D E S C R I P T I O N
HIGH-DENSITY DISK RECORDING MEDIUM AND A DRIVING
METHOD THEREOF
1. TECHNICAL FIELD
5 The present invention relates to a high-density optical disk such as a Blu-ray disk, and further to a driving method of preventing collision of an optical pickup's objective lens with a high-density disk in the event that the disk is placed upside down in a disk 10 recording/reproducing apparatus.
2. BACKGROUND ART
A compact disk, usually called CD", is 1.2mm in thickness and 120mm in diameter as shown in Fig. 1. A CD has a center hole of 15mm diameter and a clamping zone of
15 44mm, which encircles the center hole where the clamping zone is clamped by a clamper on a spindle or a turntable installed in a disk device.
When a CD is normally placed into a disk device, its recording layer, which has pit patterns, is approximately
20 1.2mm from a surface confronting an objective lens of an optical pickup equipped in the disk device. The objective lens for a CD has a numerical aperture (NA) of 0.45, which is relatively small.
A digital versatile disk, usually called "DVD", is
25 1.2mm in thickness and 120mm in diameter like a CD as shown in Fig. 2. A DVD also has a center hole of 15mm diameter and a clamping zone of 44mm encircling the center hole.
When a DVD is normally placed into a disk device, its recording layer, which has pit patterns, is approximately 0.6mm from a surface confronting an objective lens of an optical pickup equipped in the disk device. The objective lens for a DVD has a NA of 0.6, which is relatively large.
A new high-density disk, e.g., Blu-ray disk (abbreviated as "BD" hereinafter), which is under development, is 1.2mm in thickness and 120mm in diameter, like a CD as shown in Fig. 3. A BD also has a center hole of 15mm diameter and a clamping zone of 44mm encircling the center hole.
If a BD is normally placed into a disk recording/reproducing apparatus, there will be a 0.1mm gap between its recording layer, which also has pit patterns, and a surface confronting an objective lens of an optical pickup for a BD, which has the largest NA of 0.85. The optical pickup for a BD uses a laser beam of shorter wavelength than for a CD or a DVD to record or reproduce signals in high density.
Therefore, in comparison with a CD or a DVD, a BD uses an objective lens that is situated closer to the recording layer, that uses a laser beam of shorter wavelength, and that has a greater NA. According to these conditions, it is possible to concentrate a stronger intensity of light on a smaller beam spot formed on the high-density pit patterns of the recording layer of a BD. Consequently, the transmitting distance of a laser beam of shorter wavelength is shortened.
If a BD 10 is normally placed onto a turntable 11 installed in a disk device as shown in Fig. 4, a conventional servo-controlling operation for a spindle motor 12 by a motor driving unit 13 and a servo controller 15 is conducted to rotate the placed BD 10 at a constant and high speed. While the BD 10 is rotating, a focusing-servo operation is conducted to focus a laser beam for an optical pickup 14 exactly onto the recording layer 9. This operation is performed by moving the objective lens λOL' of the optical pickup 14 in an up and down direction within an operating distance OD' . If a laser beam is exactly in focus, then reproduction (or recording) of high-density pit patterns can be accomplished .
However, when the BD 10 is misplaced onto the turntable 11 by, for example, being placed upside down as shown in Fig. 5, the BD 10 will still be rotated at a constant and high speed by the combined servo-controlling operation by the spindle motor 12, the motor driving unit 13, and the servo controller 15. However, if the BD 10 has been placed upside down, the gap between the recording layer 9 and the objective lens λOL' of the optical pickup 14 is 1.1mm greater in comparison with a normally-placed BD.
In this misplacement, a laser beam cannot be focused within the conventional operating distance of the objective lens OL' of the pickup 14. Therefore, the servo controller 15 supervising the focusing-servo operation continues to move the objective lens ΛOL' upward to the maximum movable distance ΛOD_Max' until the laser beam is correctly focused. However, in this case, the objective lens λOL will collide with the misplaced BD 10. Consequently, the BD 10, the objective lens OL' , and/or the servo-mechanism would be irreparably damaged. 3. DISCLOSURE OF INVENTION
It is an object of the present invention to provide a high-density disk having misplacement identifiable structure which leads to selectively stop a focusing operation to prevent the collision between an objective lens of an optical pickup and the high-density disk.
It is another object of the present invention to provide a high-density disk driving method of preventing the collision of an objective lens of an optical pickup and a misplaced high-density disk by stopping a focusing operation in case of detecting abnormal states.
A high-density recording medium structured in accordance with the present invention is characterized in that it comprises a disk having first and second surfaces, the disk including a recording area and a clamping area and defining a center hole for receiving a spindle therein; a recording layer coplanarly disposed in the disk, wherein the recording layer is in closer proximity to the first surface of the disk; and reflecting means placed on the second surface except an inner zone of the disk.
A method of driving a high-density optical disk in accordance with the present invention is characterized in that it comprises: conducting a focusing operation on a target area of a disk when the disk is placed; detecting a first signal produced by a reflected beam from a surface of the disk while the focusing operation is conducted; and stopping the focusing operation if a second signal to be produced by a reflected beam from a recording layer of the disk is not detected until a time elapsed from the detection of the first signal exceeds a preset interval. Another method of driving a high-density optical disk in accordance with the present invention is characterized in that it comprises: conducting a focusing operation on a target area of a disk when the disk is placed; detecting a first signal produced by a reflected beam from a surface of the disk while the focusing operation is conducted; and stopping the focusing operation if a second signal having a predetermined level is not detected until an objective lens of an optical pickup that is moved by the focusing operation reaches a preset position.
The above-characterized high-density disk driving method provides means by which a disk recording/reproducing apparatus can prevent a high- density disk, an objective lens, and/or a servo-mechanism from irreparably damaged because of a collision of an optical pickup's objective lens with the high-density disk placed upside down.
4. BRIEF DESCRIPTION OF DRAWINGS In drawings :
Fig. 1 shows the structure of a conventional compact disk (CD) ;
Fig. 2 shows the structure of a conventional digital versatile disk (DVD) ; Fig. 3 shows the structure of a conventional Blu-ray disk (BD) ;
Figs. 4 and 5 show normal placement and misplacement of a conventional BD, respectively;
Fig. 6 is a sectional view of, for example, a BD structured according to the present invention;
Fig. 7 shows misplacement of a high-density disk structured according to the present invention;
Fig. 8 shows misplacement of a high-density disk with a reflecting film on entire surface of one side; and
Fig. 9 shows a flow diagram of a high-density disk driving method in accordance with the present invention.
5. MODES FOR CARRYING OUT THE INVENTION
In order that the invention may be fully understood,
a preferred embodiment thereof will now be described with
reference to the accompanying drawings. Fig. 6 is a sectional view of a high-density disk structured according to the present invention. The high- density disk, for example, a BD 20 structured according to the present invention has same dimension as a conventional BD depicted in Fig. 3, namely, 1.2mm in thickness and 120mm in diameter, a center hole of 15mm diameter and a clamping zone (or clamping area) of 44mm encircling the center hole.
In addition, when the BD 20 of Fig. 6 is normally placed into a disk recording/reproducing apparatus, its recording layer, which contains pit patterns, would be approximately 0.1mm from its surface confronting the objective lens of an optical pickup as mentioned before.
The BD 20 of the present invention has such a distinctive feature that a reflecting film 601 is formed on or a reflecting label is attached to a side opposite to which a recording layer is disposed in. As shown in Fig. 6, the reflecting film or label 601 covers the one side except a loop-shaped zone encircling the clamping area. The loop-shaped zone, which is opposite side of a lead-in area, is 45.2mm in inner diameter and 48mm in outer diameter.
Because the lead-in area of a disk contains navigation data to be referred in searching recorded data, a disk recording/reproducing apparatus generally tries to read signals written in the lead-in area first of all when a disk is placed therein.
If the disk 20 structured as above is placed normally into a disk recording/reproducing apparatus as shown in Fig. 6, the disk surface which the reflecting film or label 601 is formed on or attached to is at the back of the recording layer with respect to the objective lens OL' of an optical pickup.
After successful clamping of the BD 20, a disk recording/reproducing apparatus, of which operation is explained with reference to Fig. 4, conducts a conventional servo-controlling operation, characterized by the operation of the spindle motor 12, the motor driving unit 13 and the servo controller 15, to rotate the normally-placed disk 20 at a constant and high speed, and to focus a laser beam exactly onto the lead-in area of the recording layer in order to read out navigation data. After the navigation data is obtained successfully, reproduction of data written on the recording layer can be performed based on the navigation data. By the way, if the BD 20 is placed upside down in a disk recording/reproducing apparatus as shown in Fig. 7, the disk surface which the reflecting film or label 601 is formed on or attached to is in front of the lead-in area of the recording layer with respect to the objective lens OL' of the optical pickup.
However, the misplaced state of the BD 20 is totally same with normally-placed case from startup focusing point of view because there is no reflective means on the loop-shaped zone ranging 45.2mm to 48mm in diameter.
This situation that the BD 20 with partial reflecting means on its one side is misplaced can be distinguished from the case that a disk with reflecting means on its entire one side is misplaced as shown in Fig. 8.
In the event that a disk with reflecting means on its entire one side is misplaced, the reflecting film or label in front of a lead-in area with respect to an optical pickup reflects an incident beam much more than normal surface during start-up focusing, which leads easy judgment of misplacement. However, in the event that the BD of Fig. 6 is misplaced as shown in Fig. 7, not reflecting means but disk surface reflects an incident beam because there is no reflecting means on a zone to which a beam is incident.
Therefore, misplacement of a disk structured as Fig. 6 can not be determined based on difference of reflected beam intensity.
Fig. 9 is a flow chart of an embodiment of a method to determine misplacement of a high-density disk in accordance with the present invention.
If the BD 20 structured in accordance with the present invention is placed in a disk recording/reproducing apparatus (S10), the servo controller 15 conducts a focusing operation while rotating the placed BD 20 at a high speed. The focusing operation moves upward the objective lens OL of the optical pickup below an inner zone, e.g., a lead-in area of the BD 20 to focus a laser beam exactly onto recording layer of the BD 20 (Sll) . While the objective lens is going up, the servo controller 15 continues to detect an RF level λRF_dl' made by a reflected beam from the BD 20 (S12) and to compare the detected level λRF_dl' with a first preset reference λRF_Refl' to know whether the detected level RF_dl' is equal to the first reference RF_Refl' .
If both are equal (S13) , the servo controller 15 determines that an incident beam of the optical pickup 14 is exactly focused on the disk surface and starts to count time (S15) . While counting time, the servo controller 15 keeps moving the objective lens upward and detecting another RF level ΛRF_d2' made by the reflected beam (S15) .
The detected level RF_d2' is also compared by the servo controller 15 with a second preset reference
ΛRF_Ref2' that is RF level of a reflected beam when an incident beam is exactly focused on the recording layer of a BD. If the detected level RF_d2' becomes equal to the second reference λRF_Ref2' (S16), the servo controller 15 determines that the BD 20 is placed normally (S17), maintains the current focusing states and conducts the next servo operation (S18) .
However, if the detected RF level λRF_d2' does not reach the second reference ΛRF_Ref2' (S19) until the counted time exceeds a preset interval that is set a little longer than a time required to focus on a recording layer from disk surface of a BD, the servo controller 15 determines that the BD 20 is placed upside down (S20) and immediately stops a current focusing operation (S21) .
In addition, if the detected RF level ΛRF_d2' does not reach the second reference RF Ref2' (S19) until the objective lens reaches a limit height set within its movable range, the servo controller 15 also conducts the same operations such as focusing stop.
The above-explained disk misplacement determining method is also applicable to a conventional BD with no reflecting means on either side.
While the invention has been disclosed with respect to a limited number of embodiments, those skilled in the art, having the benefit of this disclosure, will appreciate numerous modifications and variations therefrom. It is intended that all such modifications and variations fall within the spirit and scope of the invention.

Claims

1. A method of driving a disk when the disk is placed, comprising: conducting a focusing operation on a target area of the disk; detecting a first signal produced by a reflected beam from a surface of the disk while the focusing operation is conducted; and stopping the focusing operation if a second signal to be produced by a reflected beam from a recording layer of the disk is not detected until a time elapsed from the detection of the first signal exceeds a preset interval.
2. The method of claim 1, further comprising: maintaining a focusing state set when the second signal is detected, if the second signal is detected before the time elapsed from the detection of the first signal exceeds the preset interval.
3. The method of claim 1, wherein level of the first signal is smaller than that of the second signal.
4. The method of claim 1, wherein the target area is where navigation information of recorded data on the disk is recorded.
5. A method of driving a disk when the disk is placed, comprising: conducting a focusing operation on a target area of the disk; detecting a first signal produced by a reflected beam from a surface of the disk while the focusing operation is conducted; and stopping the focusing operation if a second signal having a predetermined level is not detected until an objective lens of an optical pickup that is moved by the focusing operation reaches a preset position.
6. The method of claim 5, further comprising: maintaining a focusing state set when the second signal is detected, if the second signal is detected before the objective lens of an optical pickup reaches the preset position.
7. The method of claim 5, wherein the second signal is a signal of a reflected beam when an incident beam of the optical pickup is focused on a recording layer of the disk.
8. The method of claim 5, wherein level of the first signal is smaller than the predetermined level.
9. A recording medium for storing data, comprising: a disk having first and second surfaces, the disk including a recording area and a clamping area and defining a center hole for receiving a spindle therein; a recording layer coplanarly disposed in the disk, wherein the recording layer is in closer proximity to the first surface of the disk; and reflecting means placed on the second surface except an inner zone of the disk.
10. The recording medium of claim 9, wherein the inner zone having no the reflecting means includes a disk surface of a recording area where navigation information of recorded data on the disk is recorded.
PCT/KR2003/001859 2002-09-12 2003-09-09 High-density disk recording medium and a driving method thereof WO2004025634A1 (en)

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AU2003260993A AU2003260993A1 (en) 2002-09-12 2003-09-09 High-density disk recording medium and a driving method thereof

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KR1020020055478A KR20040024014A (en) 2002-09-12 2002-09-12 High-density optical disc and method for driving them
KR10-2002-0055478 2002-09-12

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JPH0312825A (en) * 1989-06-09 1991-01-21 Onkyo Corp Focusing device and optical disk discrimination device
JPH09128780A (en) * 1995-10-27 1997-05-16 Sharp Corp Lens cleaning disk

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