JP2009283063A - Optical disk apparatus, determination method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent data failure in reproduction or recording caused by disk curvature. <P>SOLUTION: A controlling section 90 drives an objective lens 24 in its optical axis direction using an FOD signal which vibrates at constant amplitude and predetermined frequency while an optical disk medium 200 is transported from a slot 4 to a turntable 3. In steps 209, 211 and 213, the controlling section 90 calculates an amount of curvature of the optical disk medium 200 based on a relationship between an FE signal and the FOD signal while the optical disk medium 200 is transported to the turntable 3. In step 215, the controlling section 90 determines the pass/reject of the optical disk medium 200 based on the calculated level of curvature of the optical disk medium 200 and ejects the optical disk medium 200 that is determined as a defect in step 217. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical disk device, a method for determining the quality of an optical disk, and a program for causing a computer to execute a procedure for determining the quality of an optical disk inserted in the optical disk device.

  In the slot-in type optical disc apparatus, the optical disc inserted from the slot is transported to the turntable and set on the turntable. The optical disc apparatus reproduces or records data on an optical disc set on a turntable using an optical pickup that is controlled in focus and tracking. When the user requests to take out the optical disk, the optical disk is transported from the turntable to the insertion slot and ejected from the slot (see, for example, Patent Document 1).

  In such an optical disk device, if the amount of warping of the optical disk is too large, it is difficult to perform good data reproduction and the like. For this reason, the upper limit value of the warpage amount is defined by the standard for the optical disc.

JP 2000-315349 A

  However, in the market, it is the actual situation that optical discs having a larger warp amount than the allowable value defined in the standard are in circulation. An optical disk having a large warpage not only makes it difficult to reproduce or record the data, but also makes it difficult to eject the optical disk because the optical disk is caught inside the apparatus.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical disc apparatus, a determination method, and a program that can prevent inconvenience such as data reproduction or recording failure due to warpage of the optical disc. And

  To achieve the above object, an optical disc apparatus according to a first aspect of the present invention includes a turntable for rotating an optical disc, and the optical disc inserted in a direction substantially parallel to an orthogonal plane orthogonal to the rotation axis of the turntable. An insertion port, a transport mechanism for transporting the optical disc along the orthogonal plane between the insertion port and the turntable, and irradiating the recording surface of the optical disc with a luminous flux and reflecting the luminous flux from the recording surface Is an optical pickup that outputs a detection signal corresponding to the amount of received light, the optical pickup having an objective lens that condenses the light flux on the recording surface, and the optical pickup or the objective lens, An actuator driven in the direction of the optical axis of the objective lens, and detection of the optical pickup during data reproduction or recording on the optical disc. A control device that performs focus control by driving the optical pickup or the objective lens in the optical axis direction by the actuator based on a focus error signal included in a signal, wherein the optical disk is inserted by the transport mechanism A control device that vibrates the optical pickup or the objective lens in the direction of the optical axis by the actuator according to a drive signal that vibrates with a constant amplitude while being conveyed from the mouth to the turntable, and acquires the focus error signal; A calculation device for calculating a warp amount of the optical disk based on a relationship between the focus error signal and the drive signal while the optical disk is conveyed from the insertion port to the turntable by the conveyance mechanism; The optical disk calculated by the apparatus Based on the amount of warpage, and a judging unit the quality of the optical disc.

  In this case, when the determination device determines that the optical disk is defective, the transport mechanism may transport the optical disk in the direction of the insertion slot and eject the optical disk from the insertion slot.

  Moreover, when the said determination apparatus determines with the said optical disk being defective, it is good also as providing the alerting | reporting apparatus which alert | reports that.

  Further, the optical pickup may be disposed between the insertion port and the turntable.

  Further, the control device may move the optical pickup to a position closest to the insertion port when the optical disc is inserted from the insertion port by the transport mechanism.

  Further, the calculation device may calculate the warpage amount of the optical disc based on the signal level of the drive signal when the focus error signal fluctuates.

  Further, the control device may position the optical pickup at a predetermined position in the orthogonal plane while vibrating the optical pickup or the objective lens in the optical axis direction according to the drive signal.

  Furthermore, a determination method according to a second aspect of the present invention includes a turntable for rotating an optical disc, an insertion slot for inserting the optical disc in an orientation substantially parallel to an orthogonal plane orthogonal to the rotation axis of the turntable, Between the insertion opening and the turntable, the optical disk is transported along the orthogonal plane, and the recording surface of the optical disk is irradiated with a light beam and the reflected light beam from the recording surface is received, An optical pickup that outputs a detection signal corresponding to the amount of received light, the optical pickup having an objective lens for condensing the light flux on the recording surface, and the optical pickup or the objective lens, the optical axis of the objective lens Actuators that are driven in the direction and during the reproduction or recording of data on the optical disc, A determination method of pass / fail of the optical disc in an optical disc apparatus comprising: a control device that performs focus control by driving the optical pickup or the objective lens in the optical axis direction by the actuator based on a serr signal. The optical pickup or the objective lens is vibrated in the optical axis direction by the actuator according to a drive signal that vibrates with a constant amplitude while the optical disc is conveyed from the insertion port to the turntable by the conveyance mechanism. Based on the first step of acquiring the focus error signal and the relationship between the focus error signal and the drive signal while the optical disk is being transported from the insertion port to the turntable by the transport mechanism. Second step of calculating the amount of warpage , Based on the amount of warp of said optical disk calculated by the second step includes a third step of determining the quality of the optical disc.

  Furthermore, a program according to a third aspect of the present invention includes a turntable for rotating an optical disc, an insertion slot for inserting the optical disc in a direction substantially parallel to an orthogonal plane orthogonal to the rotation axis of the turntable, and the insertion A transport mechanism for transporting the optical disc along the orthogonal plane between the mouth and the turntable; and irradiating the recording surface of the optical disc with a light beam and receiving a reflected light beam from the recording surface; An optical pickup that outputs a detection signal corresponding to the amount of received light, the optical pickup having an objective lens for condensing the light flux on the recording surface, and the optical pickup or the objective lens in the optical axis direction of the objective lens And the actuator included in the detection signal of the optical pickup during data reproduction or recording on the optical disc. A procedure for determining pass / fail of the optical disc in an optical disc apparatus comprising: a control device that performs focus control by driving the optical pickup or the objective lens in the optical axis direction by the actuator based on a cas error signal The optical pickup or the objective lens is driven by the actuator according to a drive signal that vibrates with a constant amplitude while the optical disc is transported from the insertion port to the turntable by the transport mechanism. A first procedure for oscillating in the optical axis direction and acquiring the focus error signal; and the focus error signal and the drive signal while the optical disc is being transported from the insertion port to the turntable by the transport mechanism. Based on the relationship The computer executes a second procedure for calculating the warpage amount of the optical disc and a third procedure for determining the quality of the optical disc based on the warpage amount of the optical disc calculated in the second procedure. .

  According to the present invention, it is possible to prevent inconvenience such as data reproduction or recording failure due to warpage of the optical disc.

<First Embodiment>
Next, a first embodiment of the present invention will be described in detail with reference to the drawings.

  1, 2, and 3 show a schematic internal configuration of an optical disc apparatus 100 according to the present embodiment. FIG. 1 is a view of the internal configuration of the optical disc apparatus 100 as viewed from the side, and FIGS. 2 and 3 are views of the internal configuration of the optical disc apparatus 100 as viewed from above. The optical disc device 100 is a playback device that plays back data recorded on the optical disc medium 200. The optical disk medium 200 may be a CD, DVD, or BD (Blu-ray Disc).

  As shown in FIG. 1, an optical disc apparatus 100 includes a chassis 1, a spindle motor 2, a turntable 3, a slot 4, a feed roller 5, an elastic member 6, a sensor 7, a guide 8, and a clamper. 9, a clamper holder 10, a feeding mechanism 11, and an optical pickup 12. As shown in FIGS. 2 and 3, the optical disc apparatus 100 further includes a loading motor 13 and load arms 14, 15, and 16. In FIG. 1, the loading motor 13 and the load arms 14, 15, 16 are not shown.

  The chassis 1 is attached and fixed to the inner bottom surface of an outer case (not shown) via screws or the like. A spindle motor 2 is fixed to the chassis 1 so that its rotational axis is parallel to the Z axis. A turntable 3 is fixed to the rotation shaft of the spindle motor 2. As a result, when the spindle motor 2 rotates, the turntable 3 rotates.

  The slot 4 is an insertion slot into which the optical disc medium 200 can be inserted in a direction substantially parallel to an orthogonal plane orthogonal to the rotation axis of the turntable 3. The feed roller 5 is provided near the slot 4 (on the + Y side). As shown in FIGS. 2 and 3, the feed roller 5 can rotate around the X axis by driving a loading motor 13. The feed roller 5 is supported by the chassis 1 via an elastic member 6. The sensor 7 detects the tension generated in the elastic member 6. When the optical disk medium 200 is inserted into the insertion slot, the tension generated in the elastic member 6 changes. When a change in tension is detected by the sensor 7, the feed roller 5 rotates around the X axis in accordance with the rotation of the loading motor 13 under the control of the control unit 90 described later, and the optical disk medium 200 is moved into the optical disk device 100. Be drawn into. The optical disk medium 200 is inserted into the optical disk device 100 while being sandwiched between the feed roller 5 and the guide 8.

  The optical disk medium 200 drawn into the inside by the feed roller 5 comes into contact with the leading ends of the load arms 14 and 15 shown in FIG. A concave portion is formed at these tip portions so that the outer edge of the optical disc medium 200 can be held without dropping. In addition, the joints of the load arms 14 and 15 rotate around the Z axis and can be freely deformed around the joints. When the optical disk medium 200 moves in the + Y direction by the rotation of the feed roller 5, the leading ends of the load arms 14 and 15 slide along the outer edge while holding the outer edge of the optical disk medium 200. Thereby, the optical disc medium 200 is conveyed in the + Y direction in the apparatus while maintaining a horizontal state (a state parallel to the XY plane). The portions other than the tip portions of the load arms 14 and 15 are arranged on the −Z side with respect to the optical disc medium 200, and are therefore designed not to interfere with the optical disc medium 200.

  The optical disc medium 200 supported by the load arms 14 and 15 and further conveyed in the + Y direction by the feed roller 5 abuts against the tip of the load arm 16. The load arm 16 is rotatable around the Z axis. When the optical disk medium 200 is transported in the + Y direction, the load arm 16 rotates around its joint while holding the outer edge of the optical disk medium 200 together with the load arms 14 and 15 at the tip. The optical disk medium 200 is supported at three points by the load arms 14 to 16, and is further conveyed in the + Y direction through the apparatus in a posture parallel to the XY plane. The optical disk medium 200 is further conveyed in the + Y direction by the load arms 14 to 16 even after being separated from the feed roller 5.

  In this way, the optical disk medium 200 is sent above the turntable 3 (+ Z side) as shown in FIG. When the center of the optical disk medium 200 and the rotation center of the turntable 3 coincide with each other, the clamper holder 10 is lowered, and the optical disk medium 200 is held on the turntable 3 by the clamper 9. When the optical disk medium 200 is held on the turntable 3, the load arms 14 to 16 are moved away from the optical disk medium 200. As a result, the optical disk medium 200 can be driven to rotate by the spindle motor 2.

  As described above, the optical disc medium 200 inserted from the slot 4 is conveyed in the + Y direction between the slot 4 and the turntable 3 while maintaining its orientation while being held by the load arms 14 to 16. The That is, the optical disc medium 200 is inserted in a direction parallel to the orthogonal plane of the rotation axis of the turntable 3, transported along the orthogonal plane, and then held on the turntable 3.

  The feed mechanism 11 sends the optical pickup 12 onto a straight line that passes through the rotation center of the turntable 3. The optical pickup 12 is movably supported by the chassis 1 via the feed mechanism 11. The optical pickup 12 is sent on a straight line passing through the rotation center of the turntable 3. That is, the optical pickup 12 can be moved in the radial direction of the optical disk medium 200 set on the turntable 3 by the feeding mechanism 11. In the present embodiment, the optical pickup 12 is disposed between the slot 4 and the turntable 3.

  The optical pickup 12 irradiates the optical disc medium 200 with, for example, blue-violet laser light and receives the reflected light. The optical pickup 12 outputs an electrical signal corresponding to the received light intensity of the reflected light.

  FIG. 4 shows the configuration of the control system of the optical disc apparatus 100. As shown in FIG. 4, the control system of the optical disc apparatus 100 includes a stepping motor 18 in addition to the spindle motor 2, the sensor 7, the feeding mechanism 11, the optical pickup 12, and the loading motor 13 described above. RF circuit 30, signal processing circuit 40, laser driver 45, digital servo processor 50 (hereinafter abbreviated as “DSP50”), actuator driver 60, stepping motor driver 70, spindle motor driver 75, A loading motor driver 80 and a control unit 90 are provided. The optical disc apparatus 100 further includes an APC (Automatic Power Control) circuit for controlling the intensity of the laser beam, but the illustration thereof is omitted in FIG. 4 to prevent the drawing from being complicated.

  As described above, when the insertion of the optical disk medium 200 is detected by the sensor 7, the control unit 90 rotates the loading motor 13 via the loading motor driver 80, and the optical disk medium 200 is moved inside the apparatus as described above. Pull in.

  The stepping motor 18 is driven by pulse width modulation (PWM) control via a stepping motor driver 70. The control unit 90 instructs the DSP 50 to move the optical pickup 12 to a target position. In response to this instruction, the DSP 50 generates a PWM modulation signal for moving the optical pickup 12 to a target position in accordance with a predetermined speed profile, and supplies the PWM modulation signal to the stepping motor driver 70. The stepping motor driver 70 amplifies the PWM signal output from the DSP 50 and supplies it to the stepping motor 18. In accordance with the supplied PWM signal, the stepping motor 18 rotates, and the feed mechanism 11 moves the optical pickup 12 to a position corresponding to the track on the recording surface of the target optical disc medium 200. Such an operation is generally called a seek operation.

  FIG. 5 shows a specific configuration of the optical pickup 12. As shown in FIG. 5, the optical pickup 12 includes a laser diode 21, an optical system 23, an objective lens 24, a photodiode 25, and an actuator 28.

  The laser diode 21 receives power supplied from the laser driver 45 and oscillates and outputs, for example, blue-violet laser light having a wavelength of 405 nm. The blue-violet laser beam from the laser diode 21 enters the optical system 23.

  The optical system 23 includes a collimator lens (not shown), a beam splitter, a λ / 4 plate, and the like. The optical system 23 guides the blue-violet laser beam from the laser diode 21 to the objective lens 24 and reflects the reflected beam via the objective lens 24. To the photodiode 25.

  The objective lens 24 condenses the blue-violet laser beam from the optical system 23 onto the recording surface of the optical disc medium 200 to form a beam spot, and converts the reflected beam from the recording surface into parallel light. To 23.

  The photodiode 25 receives the reflected light guided by the optical system 23. An electrical signal generated by photoelectric conversion of the photodiode 25 is output to the RF circuit 30.

  The RF circuit 30 generates an FE (Focus Error) signal, a TE (Tracking Error) signal, an RF signal, and the like based on the electrical signal output from the photodiode 25 that constitutes the optical pickup 12. These signals are output to the DSP 50.

  The FE signal is a signal indicating defocusing of the beam spot on the recording surface of the optical disc medium 200, and the TE signal is a signal indicating tracking deviation of the beam spot from the track on the recording surface of the optical disc medium 200. In order to accurately reproduce the data recorded on the recording surface of the optical disk medium 200, a beam spot of blue-violet laser light is accurately formed on the recording surface of the optical disk medium 200 and is recorded on a track on the recording surface. It is necessary to follow. The FE signal and the TE signal are used for focusing and tracking control of such a beam spot.

  In the optical disc apparatus 100, the FE signal is acquired using the astigmatism method. FIG. 6 shows the characteristics of the FE signal. In FIG. 6, the horizontal axis is the distance between the objective lens 24 and the recording surface of the optical disk medium, and the vertical axis is the signal level of the FE signal. When the distance between the objective lens 24 and the recording surface of the optical disc medium 200 is the best focus, the signal level of the FE signal is zero. In FIG. 6, the FE signal in the best focus state is taken at the origin. When the distance between the objective lens 24 and the recording surface of the optical disc medium 200 becomes wider (away from) the best focus, the signal level of the FE signal increases in the negative direction. When the objective lens 24 and the recording surface of the optical disc medium 200 are further distant and the distance between them increases, the signal level of the FE signal reaches a peak at a certain position and then converges to zero. Further, when the distance between the objective lens 24 and the recording surface of the optical disc medium 200 is narrower (closer) than the best focus, the signal level of the FE signal increases in the positive direction. As the distance between the objective lens 24 and the recording surface of the optical disc medium 200 becomes closer, the signal level of the FE signal peaks at a certain position and then converges to zero.

  That is, when the distance between the objective lens 24 and the recording surface of the optical disk medium changes, the FE signal changes in an S shape around the best focus position.

  As shown in FIG. 5, the objective lens 24 can be finely moved in the focus direction and the tracking direction by an actuator 28. The actuator 28 finely adjusts the position of the objective lens 24 in the focus direction and the track direction according to the drive power supplied from the actuator driver 60. For example, the actuator 28 moves the objective lens 24 in the optical axis direction (Z-axis direction) so that the condensing position of the blue-violet laser light matches the recording surface.

  The DSP 50 performs phase compensation on the FE signal and TE signal output from the RF circuit 30, generates a control signal for the actuator 28 based on the FE signal and TE signal whose phase has been compensated, and outputs the control signal to the actuator driver 60. To do. Of these control signals, a drive signal for the focus direction of the objective lens 24 is referred to as a focus drive signal (FOD signal). The actuator driver 60 supplies a drive voltage to the actuator 28 based on this control signal. The actuator 28 is driven by this driving voltage, focusing is performed so that the beam spot of the blue-violet laser beam is maintained on the recording surface of the optical disk medium 200, and tracking is performed so as to follow the track of the optical disk medium 200. . That is, the DSP 50 performs focusing and tracking by driving the actuator 28 based on the FE signal and the TE signal output from the RF circuit 30 so as to reduce defocus and tracking deviation.

  Further, the DSP 50 extracts a synchronization signal from the RF signal. The DSP 50 generates a control signal for the spindle motor 2 in accordance with the phase difference between the extracted synchronization signal and the reference signal determined by the control unit 90. The generated control signal is output to the spindle motor driver 75.

  The spindle motor driver 75 supplies power to the spindle motor 2 in accordance with a control signal output from the DSP 50 in order to drive the spindle motor 2. The spindle motor 2 rotates the turntable 3 and the optical disc medium 200 according to the electric power supplied from the spindle motor driver 75.

  The RF circuit 30 also outputs the RF signal to the signal processing circuit 40. The signal processing circuit 40 decodes the RF signal output from the RF circuit 30 to generate a data signal. The generated data signal is output to the control unit 90. The control unit 90 reproduces data based on the data signal output from the signal processing circuit 40.

  A series of data reproduction operations is realized by the control of the control unit 90. The control unit 90 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like (not shown). In the control unit 90, for example, the CPU executes a control program stored in the ROM, thereby performing overall control of the entire optical disc apparatus 100. In practice, the control unit 90 controls the entire optical disc apparatus 100 by outputting operation commands to the signal processing circuit 40 and the DSP 50.

  More specifically, the control unit 90 sends a seek operation command to the DSP 50. In response to the seek operation command, the DSP 50 rotates the stepping motor 18 via the stepping motor driver 70 to move the optical pickup 12 onto the target track of the optical disc medium 200. When the seek operation is completed, the control unit 90 sends a data reproduction command to the signal processing circuit 40 and the DSP 50. Upon receiving this command, the signal processing circuit 40 outputs a control signal for the laser diode 21 to the laser driver 45, and causes the laser diode 21 to oscillate and output blue-violet laser light. In response to this instruction, the DSP 50 performs focusing, tracking, and spindle control as described above. The control unit 90 reproduces data based on the data signal output from the signal processing circuit 40.

  The optical disc apparatus 100 according to the present embodiment detects the amount of warpage of the optical disc medium 200 when the optical disc medium 200 is carried in. If the detected amount of warpage exceeds the allowable value, the optical disc apparatus 100 ejects the optical disc medium 200 from the slot 4 without placing it on the turntable 3. The allowable value of the warp amount is a value based on the internal structure and performance of the optical disc apparatus 100 so that the optical disc medium 200 is not caught inside the apparatus and the recorded data can be reproduced without any problem. Can be set.

  In the present embodiment, the amount of warpage of the optical disc medium 200 is calculated based on the relationship between the FOD signal and the FE signal used for focus control of the objective lens 24. As the optical disk medium 200 passes through the + Z side of the optical pickup 12 while being transported from the slot 4 to the turntable 3, as shown in FIG. 7, a blue-violet laser beam is oscillated and output from the optical pickup 12. The objective lens 24 is vibrated in the optical axis direction (Z-axis direction) by driving the actuator 28 based on the FOD signal having a constant amplitude and a predetermined frequency (for example, 30 Hz to 40 Hz).

  When the objective lens 24 is vibrated in the Z-axis direction, the focal position of the blue-violet laser light also vibrates in the Z-axis direction. Due to this vibration, the timing at which the focal position of the blue-violet laser light emitted from the optical pickup 12 matches the recording surface of the optical disc medium 200, that is, the timing at which the distance between the objective lens 24 and the optical disc medium 200 is the best focus, It will occur periodically. At this timing, the FE signal changes to an S shape.

  Here, attention is focused on the relationship between the FE signal and the FOD signal. Since the FOD signal corresponding to the focal position (position in the Z-axis direction) of the blue-violet laser beam vibrates with a constant amplitude, the position in the Z-axis direction of the recording surface of the optical disc medium 200 on which the beam spot is hit changes. Otherwise, the signal level of the FOD signal at the timing when the FE signal changes to an S-shape continues to be the same value. However, if the position in the Z-axis direction of the recording surface of the optical disc medium 200 on which the beam spot hits changes, the signal level of the FOD signal at the timing at which the FE signal changes to an S shape changes in accordance with the change in the position. (See FIGS. 9A to 9C and FIGS. 10A to 10C described later).

  While the objective lens 24 vibrates, the optical disc medium 200 is conveyed in the + Y direction. Therefore, if the optical disk medium 200 is warped, the position in the Z-axis direction of the recording surface of the optical disk medium 200 on which the beam spot hits changes, so that the signal level of the FOD signal when the FE signal changes to an S shape changes. Will come to do. In the present embodiment, the amount of warpage of the optical disc medium 200 is detected by tracking the change in the signal level of the FOD signal when the FE signal changes to an S shape.

  FIG. 8 shows a flowchart of the operation of detecting the warp amount of the optical disc medium 200 of the optical disc apparatus 100 according to the present embodiment. As shown in FIG. 8, first, in step 201, the control unit 90 waits until the optical disc medium 200 is inserted. Here, the control unit 90 determines based on the output of the sensor 7 whether or not the optical disc medium 200 has been inserted. When the optical disk medium 200 is inserted, the determination at step 201 is affirmed and the routine proceeds to step 203.

  In step 203, the control unit 90 instructs the DSP 50 to move the optical pickup 12 to the vicinity of the slot 4. In response to this, the DSP 50 drives the stepping motor 18 via the stepping motor driver 70 and moves the optical pickup 12 to the vicinity of the slot 4 by the feed mechanism 11. If the optical pickup 12 is brought close to the slot 4, the blue-violet laser light from the optical pickup 12 can be quickly applied to the recording surface of the optical disk medium 200 inserted from the slot 4. The time until the amount of warpage is detected can be shortened. Thereafter, the optical pickup 12 is positioned at a position in the vicinity of the slot 4 in the XY plane under the control of the control unit 90 and the DSP 50 until the warp amount detection operation is completed. As described above, if the position of the optical pickup 12 in the XY plane is fixed, the warp amount of the optical disk medium 200 conveyed in the + Y direction can be stably detected using the optical pickup 12. become.

  In the next step 205, the control unit 90 instructs the DSP 50 to vibrate the objective lens 24 in the Z-axis direction and instructs the signal processing circuit 40 to cause the laser diode 21 to oscillate. As a result, the DSP 50 drives the actuator 28 with a constant amplitude based on the FOD signal of a predetermined frequency (for example, 30 Hz to 40 Hz) via the actuator driver 60 and moves the optical pickup 12 in the Z-axis direction. Vibrate. In addition, the signal processing circuit 40 turns on the laser power and causes the laser diode 21 to oscillate and output blue-violet laser light via the laser driver 45.

  The laser light emitted from the optical pickup 12 is irradiated onto the recording surface of the optical disc medium 200 via the objective lens 24, and the reflected light beam from the recording surface is incident from the objective lens 24, and the photodiode 25 as described above. Is received. The electrical signal output from the photodiode 25 is sent to the RF circuit 30, and the RF circuit 30 outputs an FE signal corresponding to the electrical signal to the DSP 50. The control unit 90 starts acquiring the FE signal and the FOD signal via the DSP 50.

  In the next step 207, the control unit 90 determines whether or not the setting of the optical disc medium 200 on the turntable 3 is completed. If this determination is affirmed, the process ends. If not, the process proceeds to step 209.

  In step 209, the control unit 90 determines whether or not the signal level of the FE signal has changed to an S shape. If this determination is denied, the process returns to step 207, and if affirmed, the process proceeds to step 209. Here, it is assumed that the control unit 90 returns to Step 207. Thereafter, step 207 → 209 is repeated until the determination of the optical disk medium 200 is completed in step 207 and the determination is affirmed or a change in the signal level of the FE signal is detected in step 209.

  After the determination in step 209 is affirmed, in step 211, the control unit 90 acquires the signal level of the FOD signal when the signal level of the FE signal changes to an S shape. The signal level of the acquired FOD signal represents the position of the optical pickup 12 in the Z-axis direction in a focused state.

  In the next step 213, the control unit 90 calculates the warpage amount of the optical disc medium 200. In the present embodiment, the width between the maximum value and the minimum value of the signal level of the FOD signal acquired so far in step 211 is calculated as the warpage amount of the optical disc 200. At the first time, since there is only one sample data, the calculated value of the warpage amount is zero.

  In the next step 215, the control unit 90 determines whether or not the calculated value of the warpage amount exceeds the allowable value. If this determination is affirmed, the process proceeds to step 217, and if not, the process returns to step 207. Since the calculated value of the warpage amount is 0 at the first time, the determination is negative and the processing returns to step 207.

  When returning to step 207, steps 207 → 209 are repeated again. If the FE signal changes to an S-shape and the determination in step 209 is affirmative, the signal level of the FOD signal at that time is acquired in step 211, the amount of warpage is calculated in step 213, and the calculation is performed in step 215. It is determined whether or not the warped amount exceeds the allowable value.

  In this way, the control unit 90 obtains the level of the FOD signal every time the 0 level of the FE signal that changes in an S-shape is detected, and the difference between the maximum value and the minimum value of the level is calculated as the optical disc. The amount of warpage of the medium 200 is calculated, and the calculated amount of warpage is determined using an allowable value.

  FIGS. 9A to 9C show a state where the optical disk medium 200 is not warped. FIG. 9A shows an FOD signal during detection of the warp amount of the optical disc medium 200. As shown in FIG. 9A, the FOD signal vibrates with a constant amplitude. As the FOD signal vibrates, the objective lens 24 vibrates in the Z-axis direction. If the objective lens 24 vibrates, the condensing position of the blue-violet laser light also vibrates in the Z-axis direction as shown in FIG. 9B. During this vibration, the signal level of the FE signal changes to an S-shape when the recording surface of the optical disc medium 200 and the condensing position of the blue-violet laser light by the objective lens 24 coincide. In FIG. 9B, the position where the signal level of the FE signal changes in an S shape is indicated by a dot. In FIG. 9C, when the signal level of the FE signal changes in an S shape. The signal level of the FOD signal is shown.

  When the signal level of the FE signal changes to an S shape, the determination in step 209 is affirmed, and in step 211, the signal level of the FOD signal at that time is acquired. In step 213, the difference between the maximum value and the minimum value of the signal level of the FOD signal acquired so far is calculated. As shown in FIG. 9C, when the optical disc medium 200 is flat, the signal level of the FOD signal when the FE signal changes to an S-shape is constant, and the maximum value and the maximum value of the signal level are the same. Since the width becomes smaller, the determination in step 215 remains negative, and the conveyance of the optical disc medium 200 onto the turntable 3 is continued.

  On the other hand, FIGS. 10A to 10C show a state where the optical disk medium 200 is greatly warped. In such a case, the difference D between the maximum value and the minimum value of the FOD signal when the signal level of the FE signal is 0 becomes large. When the difference D exceeds the allowable value, the determination in step 215 is affirmed and the process proceeds to step 217.

  Returning to FIG. 8, in step 217, the control unit 90 ejects the optical disk medium 200. In parallel with this, the control unit 90 displays on the display screen of the optical disc apparatus 100, for example, “cannot be played because the warp amount of the optical disc medium 200 exceeds the allowable value”. As a result, the user can know that the warpage amount of the inserted optical disk medium 200 exceeds the allowable value. Note that the user may be notified that the amount of warpage of the optical disc medium 200 exceeds the allowable value by audio output. After step 217 ends, the process ends.

  On the other hand, if the amount of warpage of the optical disk medium 200 remains below the allowable value, the determination in step 215 remains negative, the optical disk medium 200 is set on the turntable 3, and the determination in step 207 is affirmed. The control unit 90 ends the process.

  By performing the above processing, when an optical disc medium 200 having a warpage exceeding an allowable value is inserted into the optical disc apparatus 100, the optical disc medium 200 is ejected before being set on the turntable 3.

  In the above embodiment, the optical disk medium 200 is transported to the turntable 3 using the load arms 14 to 16, but the transport mechanism for transporting the optical disk medium 200 is not limited to this. The transport mechanism may be any mechanism that transports the optical disk medium 200 along an orthogonal plane orthogonal to the rotation axis of the turntable 3. This is because with such a transport mechanism, the amount of warpage using the optical pickup 12 can be detected. However, as in the above embodiment, in order to detect the warp amount of the optical disk medium 200 with high accuracy, it is necessary to employ a transport mechanism that transports the optical disk medium 200 while maintaining a constant posture (parallel to the XY plane). There is.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. The optical disc device 100 according to the first embodiment is a so-called slot-in type optical disc device, but the optical disc device 101 according to the present embodiment is a tray type optical disc device. The optical disc apparatus 101 is the same as the configuration of the optical disc apparatus 100 according to the first embodiment except that the optical disc apparatus 101 is a tray system, and thus detailed description of other configurations is omitted.

  FIG. 11 shows a part of the optical disk device 101 according to the present embodiment. As shown in FIG. 11, the optical disc apparatus 101 is provided with a tray 110, and the optical disc medium 200 is inserted into the apparatus while being placed on the tray 110. The tray 110 is provided with an opening 111 extending in the + Y direction. The opening 111 is provided so that the optical pickup 12 directly faces the recording surface of the optical disk medium 200 placed on the tray 110.

  Also in this optical disc apparatus 101, when the optical disc medium 200 is conveyed from the insertion port 112 to the turntable, that is, while the tray 110 is pulled into the apparatus, the objective lens 24 of the optical pickup 12 is moved as in the above embodiment. The amount of warpage of the optical disk medium 200 can be detected by vibrating in the optical axis direction.

  In such a tray type optical disc apparatus 101, the posture of the optical disc medium 200 when inserted is stable, and the inclination of the optical disc medium 200 with respect to the XY plane remains constant. The amount can be calculated with high accuracy.

  As is clear from the above description, in each of the above embodiments, the control unit 90 corresponds to a control device, a calculation device, and a determination device.

  As described above in detail, according to each of the above embodiments, the optical disk medium 200 is transported from the slot 4 to the turntable 3 and set on the turntable 3 by using the optical pickup 12. A warp amount of 200 is detected. Then, the optical disk medium 200 whose detected warp amount exceeds the allowable value is discharged without being set on the turntable 3. As a result, it is possible to prevent data reproduction or recording failure due to warpage of the optical disc medium 200 or the optical disc medium 200 from being caught by a component in the optical disc apparatus 100 and being unable to be taken out.

  Further, in each of the above embodiments, the optical pickup 12 is moved to the vicinity of the slot 4 after the optical disc medium 200 is inserted. In this way, the amount of warpage of the optical disk medium 200 can be detected quickly using the optical pickup 12, and therefore the time required to determine whether the optical disk medium 200 is good or not can be shortened. The optical disc medium 200 determined to be defective can be ejected early.

  In each of the above embodiments, the optical pickup 12 is disposed between the slot 4 and the turntable 3 in order to detect the warp amount of the optical disc medium 200 using the optical pickup 12, but the present invention is not limited to this. Not limited. For example, the optical pickup 12 may be disposed behind the turntable 3. However, when the optical pickup 12 is arranged between the slot 4 and the turntable 3 as in each of the above embodiments, the amount of warpage of the entire optical disc medium 200 can be calculated. The warpage amount of the medium 200 can be calculated, and the warpage amount can be calculated quickly.

  Further, in each of the above embodiments, the difference between the maximum value and the minimum value of the signal level of the FOD signal when the FE signal changes in an S shape is calculated as an index value of the warp amount of the optical disc medium 200. This calculation method is based on the premise that the attitude of the optical disc medium 200 is substantially horizontal to the XY plane. However, the present invention is not limited to this, and the control unit 90 accurately calculates the shape of the optical disc medium 200 based on the locus of fluctuations in the signal level of the FOD signal when the FE signal changes to an S shape. The warpage amount of the optical disc medium 200 may be calculated.

  In each of the above embodiments, the case has been described in which the amplitude of the objective lens 24 that vibrates in the Z-axis direction is sufficiently wider than the S-shaped variation range of the FE signal. In such a case, as described above, it is appropriate for the control unit 90 to calculate the warpage amount of the optical disc medium 200 based on the signal level of the FOD signal when the FE signal changes to an S shape. is there. However, when there is no difference between the fluctuation range of the objective lens 24 and the S-shaped fluctuation range of the FE signal, and the FE signal changes linearly with a zero level in accordance with the vibration of the objective lens 24, FE. Of course, the warpage amount of the optical disk medium 200 may be calculated based on the signal level of the FOD signal when the signal level of the signal becomes zero. However, in reality, since the allowable value of the warp amount of the optical disk medium is sufficiently larger than the S-shaped variation range of the FE signal, the amplitude of the objective lens 24 that vibrates in the Z-axis direction is the S-shape of the FE signal. Generally, it is sufficiently wider than the fluctuation range of the shape.

  In each of the above embodiments, the objective lens 24 is vibrated in the optical axis direction. However, an actuator for moving the optical pickup 12 up and down in the optical axis direction of the objective lens 24 is further provided, and the entire optical pickup 12 is moved up and down. You may make it make it.

  In each of the above embodiments, the insertion of the optical disk medium 200 is detected by detecting the tension of the elastic member 6. However, of course, the insertion of the optical disk medium 200 may be detected by another sensor. It is. For example, the insertion of the optical disk medium 200 may be detected using an optical sensor that combines a pair of light emitting diodes and photodiodes.

  In addition, the optical disc apparatus 100 according to each of the above embodiments is a reproducing apparatus. However, it is needless to say that the present invention can be applied to a recording apparatus that performs recording on the optical disc medium 200, and a reproducing or recording apparatus. is there.

  In each of the above embodiments, the control program has been described as being stored in advance in the ROM. This control program is distributed by being stored in a computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disk Read-Only Memory), a DVD (Digital Versatile Disc), or an MO (Magneto Optical disc). It may be installed in.

1 is a side view showing an internal configuration of an optical disc apparatus according to a first embodiment of the present invention. FIG. 2 is a top view (No. 1) showing an internal configuration of the optical disc apparatus of FIG. 1. FIG. 3 is a top view (No. 2) showing the internal configuration of the optical disc apparatus of FIG. 1. FIG. 2 is a block diagram illustrating a configuration of a control system of the optical disc apparatus in FIG. 1. It is a figure which shows the structure of the optical pick-up of FIG. It is a figure which shows FE signal. It is a figure which shows the mode of the vibration of an objective lens. It is a flowchart of the determination method of the quality of an optical disk medium. 9A to 9C are diagrams showing a case where the warpage amount of the optical disk medium is zero. FIG. 10A to FIG. 10C are diagrams showing a case where the warp amount of the optical disk medium is large. It is a perspective view which shows schematic structure of the optical disk apparatus based on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chassis 2 Spindle motor 3 Turntable 4 Slot 5 Feed roller 6 Elastic member 7 Sensor 8 Guide 9 Clamper 10 Clamper holder 11 Feed mechanism 12 Optical pick-up 13 Loading motor 14, 15, 16 Load arm 18 Stepping motor 21 Laser diode 23 Optical system 24 Objective lens 25 Photodiode 28 Actuator 30 RF circuit 40 Signal processing circuit 45 Laser driver 50 Digital servo driver 60 Actuator driver 70 Stepping motor driver 75 Spindle motor driver 80 Loading motor driver 90 Control unit 100, 101 Optical disk device 110 Tray 111 Opening 112 insertion slot

Claims (9)

A turntable that rotates the optical disc;
An insertion slot for inserting the optical disc in a direction substantially parallel to an orthogonal plane orthogonal to the rotation axis of the turntable;
A transport mechanism for transporting the optical disc along the orthogonal plane between the insertion port and the turntable;
An optical pickup that irradiates a recording surface of the optical disc and receives a reflected light beam from the recording surface and outputs a detection signal corresponding to the received light amount, and collects the light beam on the recording surface An optical pickup having an objective lens;
An actuator for driving the optical pickup or the objective lens in the optical axis direction of the objective lens;
During reproduction or recording of data on the optical disc, focus control is performed by driving the optical pickup or the objective lens in the optical axis direction by the actuator based on a focus error signal included in a detection signal of the optical pickup. A control device that performs the optical pickup or the objective lens by the actuator according to a drive signal that vibrates with a constant amplitude while the optical disc is transported from the insertion port to the turntable by the transport mechanism. A control device that vibrates in the axial direction and acquires the focus error signal;
A calculation device for calculating a warp amount of the optical disc based on a relationship between the focus error signal and the drive signal while the optical disc is conveyed from the insertion port to the turntable by the conveyance mechanism;
An optical disc apparatus comprising: a determination device that determines the quality of the optical disc based on the warpage amount of the optical disc calculated by the calculation device. When the determination device determines that the optical disc is defective,
The optical disk apparatus according to claim 1, wherein the transport mechanism transports the optical disk in the direction of the insertion slot and ejects the optical disk from the insertion slot.   The optical disc apparatus according to claim 1, further comprising a notification device that notifies that when the determination device determines that the optical disc is defective. The optical pickup is
The optical disk apparatus according to claim 1, wherein the optical disk apparatus is disposed between the insertion slot and the turntable. The controller is
2. The optical disc apparatus according to claim 1, wherein when the optical disc is inserted from the insertion port by the transport mechanism, the optical pickup is moved to a position closest to the insertion port.   The said calculation apparatus calculates the curvature amount of the said optical disk based on the signal level of the said drive signal when the said focus error signal fluctuates, The Claim 1 characterized by the above-mentioned. Optical disk device. The controller is
7. The optical pickup is positioned at a predetermined position in the orthogonal plane while the optical pickup or the objective lens is vibrated in the optical axis direction according to the drive signal. The optical disc device according to one item. A turntable that rotates the optical disc;
An insertion slot for inserting the optical disc in a direction substantially parallel to an orthogonal plane orthogonal to the rotation axis of the turntable;
A transport mechanism for transporting the optical disc along the orthogonal plane between the insertion port and the turntable;
An optical pickup that irradiates a recording surface of the optical disc and receives a reflected light beam from the recording surface and outputs a detection signal corresponding to the received light amount, and collects the light beam on the recording surface An optical pickup having an objective lens;
An actuator for driving the optical pickup or the objective lens in the optical axis direction of the objective lens;
During reproduction or recording of data on the optical disc, focus control is performed by driving the optical pickup or the objective lens in the optical axis direction by the actuator based on a focus error signal included in a detection signal of the optical pickup. An optical disc apparatus comprising: a control device for performing determination of pass / fail of the optical disc,
While the optical disc is transported from the insertion port to the turntable by the transport mechanism, the optical pickup or the objective lens is vibrated in the optical axis direction by the actuator according to a drive signal that vibrates with a constant amplitude. A first step of obtaining a focus error signal;
A second step of calculating a warpage amount of the optical disc based on a relationship between the focus error signal and the drive signal while the optical disc is conveyed from the insertion port to the turntable by the conveyance mechanism;
And a third step of determining the quality of the optical disc based on the warpage amount of the optical disc calculated in the second step. A turntable that rotates the optical disc;
An insertion slot for inserting the optical disc in a direction substantially parallel to an orthogonal plane orthogonal to the rotation axis of the turntable;
A transport mechanism for transporting the optical disc along the orthogonal plane between the insertion port and the turntable;
An optical pickup that irradiates a recording surface of the optical disc and receives a reflected light beam from the recording surface and outputs a detection signal corresponding to the received light amount, and collects the light beam on the recording surface An optical pickup having an objective lens;
An actuator for driving the optical pickup or the objective lens in the optical axis direction of the objective lens;
During reproduction or recording of data on the optical disc, focus control is performed by driving the optical pickup or the objective lens in the optical axis direction by the actuator based on a focus error signal included in a detection signal of the optical pickup. A program for causing a computer to execute a procedure for determining whether or not the optical disc is good in an optical disc apparatus comprising:
While the optical disc is transported from the insertion port to the turntable by the transport mechanism, the optical pickup or the objective lens is vibrated in the optical axis direction by the actuator according to a drive signal that vibrates with a constant amplitude. A first procedure for obtaining a focus error signal;
A second procedure for calculating a warp amount of the optical disc based on a relationship between the focus error signal and the drive signal while the optical disc is conveyed from the insertion port to the turntable by the conveyance mechanism;
A program for causing a computer to execute a third procedure for determining pass / fail of the optical disc based on the warpage amount of the optical disc calculated in the second procedure.

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