JP2005063504A - Optical disk recorder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk recorder capable of preventing an adjustment mistake of a tilt angle of an optical pickup when a write once of data is carried out to the optical disk whereon the data have been previously recorded. <P>SOLUTION: When the optical recorder 1 records the data on the optical disk D for the first time, the data are recorded on the optical disk D after adjusting the tilt angle to an optimum value by a tilt servo mechanism 4a, and the relation between an ID of this optical disk D and the optimum value of the tilt angle is established and stored in a memory 12. When the optical disk recorder 1 makes the write once to the optical disk D whereon the data are previously recorded, the ID of the optical disk D is read to confirm whether this ID is being stored by the memory 12, and when being stored, the optimum value of the tilt angle related with this ID is read out, and after the tilt angle of the optical pickup 4 is adjusted to the optimum value, the tilt servo is turned on to record the data on the optical disk D. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical disc recording apparatus provided with a mechanism for adjusting the tilt angle of an optical pickup during data recording on an optical disc.

  Optical discs such as DVD and BD (Blu-ray Disc (registered trademark)) record data at a much higher density than CDs, and track pitches and pit sizes are smaller than CDs. Therefore, when recording data on such an optical disk, it is necessary to control the spot diameter of the light beam irradiated onto the optical disk with high accuracy. In the optical disk recording apparatus, if the optical axis of the light beam emitted from the optical pickup is not substantially perpendicular to the recording surface of the DVD or BD and there is an angle shift (tilt), the light is condensed by the objective lens. In some cases, coma aberration occurs in the light spot and data recording is not successful.

  Therefore, in order to suppress the above phenomenon, a tilt servo mechanism is provided as a tilt correction means in an optical disc recording apparatus for DVD or BD.

Conventionally, when an optical disc is set, the displacement distribution of the optical disc is measured from the inner end to the outer end of the recording area, and this measurement data is stored in the memory, and the radial direction of the optical head There has been an optical head tilt device that detects a position, reads the tilt of the optical head corresponding to this position from a memory, and controls the tilt mechanism of the optical head (see, for example, Patent Document 1).
JP-A-10-177729 (page 3-5, Fig. 1-3)

  In the conventional optical disk recording apparatus, when the optical disk is set, the tilt servo mechanism adjusts the tilt angle. This adjustment is very severe. For example, even when the tilt angle is adjusted for the same optical disc, the tilt angle is often set to a different value each time the optical disc is set. For this reason, in the conventional optical disc recording apparatus, when data is recorded on the recordable optical disc, a data writing error may occur due to a tilt angle adjustment shift. In addition, even if the first data recording can be performed on a certain optical disc without any problem, the second data recording (additional writing) sometimes fails in writing due to a tilt angle adjustment shift. In this case, the data recorded for the first time on the optical disc may be unreadable.

  Therefore, the present invention provides an optical disc recording apparatus capable of preventing an adjustment error of the tilt angle of an optical pickup when data is additionally recorded on an optical disc on which data has been previously recorded. Objective.

  The present invention has the following configuration as means for solving the above problems.

(1) rotating means for rotating the set optical disc;
Measuring means for measuring the tilt angle of the optical disk at that time with respect to the optical disk rotated by the rotating means;
A recording means for recording data by irradiating an optical disk with a light beam;
Tilt servo means for adjusting the tilt angle of the recording means based on the tilt angle of the optical disk measured by the measuring means;
In an optical disk recording apparatus comprising:
Storage means for storing the tilt angle of the optical disk measured by the measurement means for each optical disk;
When the tilt servo means records data on the optical disc, the tilt servo means adjusts the tilt angle of the recording means to the tilt angle of the optical disc stored in the storage means, and then sets the tilt angle of the optical disc measured by the measuring means. The tilt angle of the recording means is adjusted based on the above.

  In this configuration, when the optical disk recording apparatus additionally writes data on the optical disk, the recording apparatus starts recording after setting the tilt angle when data was previously recorded on the optical disk in the recording means. Therefore, when data is additionally recorded on the optical disc, data can be recorded under the same conditions as in the previous recording with respect to the tilt angle, so that a data recording error can be prevented and data can be recorded reliably. .

  (2) The storage means stores the tilt angle of the optical disk measured by the measuring means unless the tilt angle of the optical disk is stored when the recording means records data on the optical disk. And

  In this configuration, when the optical disk recording apparatus records data on the optical disk, if the storage means does not store the tilt angle of the optical disk, the tilt angle is measured by the measurement means and stored in the storage means. Therefore, when data is additionally recorded on the optical disc by the optical disc recording apparatus, the tilt angle of the optical disc can be read from the storage means, and the tilt angle of the recording means can be adjusted based on the tilt angle. As with the case where the tilt angle is stored in the memory, data can be recorded reliably.

(3) If the storage means does not store the tilt angle of the optical disk, the recording means records an ID on the optical disk,
The storage means stores the tilt angle of the optical disc in the storage means in association with the ID recorded on the optical disc.

  In this configuration, since the storage means stores the tilt angle of the optical disc in association with the ID of the optical disc, when adding data to the optical disc, the initial value of the tilt amount of the optical disc is stored by reading the ID from the optical disc. The tilt angle of the recording means can be adjusted easily by reading from the means.

  According to the optical disk recording apparatus of the present invention, when data is additionally recorded on an optical disk on which data has been previously recorded, the data recording is performed by setting the initial value of the tilt amount when the data recording is successful. The data can be recorded without making a recording mistake.

  FIG. 1 is a block diagram showing a schematic configuration of an optical disc apparatus according to an embodiment of the present invention. As shown in FIG. 1A, an optical disk device 1 is a device that records data on an optical disk D having a high data recording density such as a BD or a DVD, and includes a rotary table 2, an optical disk attachment / detachment holding mechanism 2a, A spindle motor 3 having a rotating shaft 3a, an optical pickup 4, an RF amplifier 5, a driver 6, a servo circuit 7, a tilt sensor 8, a tilt angle adjusting unit 9, a decoder 10, a microcomputer 11, and a memory 12 are provided. An optical disc D such as a BD or a DVD is set on the turntable 2 by an optical disc attaching / detaching mechanism 2a.

  The spindle motor 3 rotates the turntable 2 via the rotation shaft 3a.

  The optical pickup 4 irradiates the optical disk D with a light beam, receives the reflected light of the light beam from the optical disk D, and outputs a signal (RF signal) corresponding to the amount of received light to the RF amplifier 5. The optical pickup 4 includes a focus servo mechanism and a tracking servo mechanism (not shown). Further, the optical pickup 4 includes a tilt servo mechanism 4a that maintains the optical axis of the laser light applied to the recording surface of the optical disc in a state substantially perpendicular to the recording surface.

  The RF amplifier 5 outputs a tracking error signal and a focusing error signal to the servo circuit 7 based on the RF signal output from the optical pickup 4. The RF amplifier 5 outputs an RF signal to the decoder 10.

  The driver 6 controls the rotation speed of the spindle motor 3 and the feed amount of the optical pickup 4. The driver 6 controls operations of a tilt servo mechanism 4a provided in the optical pickup 4 and a focus servo mechanism / tracking servo mechanism (not shown).

  The servo circuit 7 controls the servo operation of the optical pickup 4 by the driver circuit 6 based on the tracking error signal and the focusing error signal output from the RF amplifier 5.

  The tilt sensor 8 is a sensor that electrically detects the tilt of the optical disc D during rotation, and is attached in the vicinity of the optical pickup 4.

  The tilt angle adjustment unit 9 controls the light emission operation of the tilt sensor 8. In addition, the tilt servo mechanism 4a performs an operation based on the signal output from the tilt sensor 8 so that the optical axis of the light beam emitted from the optical pickup 4 is always substantially perpendicular to the optical disc D. A signal for adjusting the inclination angle of 4 is output to the servo circuit 7.

  The decoder 10 demodulates the RF signal output from the RF amplifier 5 and outputs the recording data of the optical disc D to the microcomputer 10.

  The microcomputer 11 can decode the RF signal output from the decoder 10, extract specific information from the recording data of the optical disc, and store it in the memory 12. Further, the microcomputer 11 can acquire information on the tilt angle of the optical disc D measured by the tilt sensor 8 from the tilt angle adjustment unit 9. Further, the microcomputer 11 controls the operation of each part of the optical disc.

  The memory 12 stores information sent from the microcomputer 11.

  Here, a detailed configuration of the tilt servo mechanism 4a will be described. As shown in FIG. 1B, the optical pickup 4 is supported by a shaft 21 and moves in the radial direction of the optical disc D along the shaft 21. The shaft 21 is rotatable in the normal direction of the recording surface of the optical disc D around a fulcrum 22 provided at the end on the spindle motor 3 side. The other end of the shaft 21 is provided with a rotation adjusting unit 23 that adjusts the amount of rotation of the shaft 21, and the rotation adjusting unit 23 corresponds to a fulcrum of the shaft 21 according to a control signal from the driver 6. Rotate the opposite end. When the shaft 21 is tilted by the rotation adjusting unit 23, the optical pickup 4 is also tilted, so that the tilt angle of the optical axis of the laser light emitted from the optical pickup 4 can be changed. Therefore, by configuring the driver 6 to operate the rotation adjusting unit 23 according to the tilt angle of the optical disk D detected by the tilt sensor 8, the optical axis of the laser light emitted from the optical pickup 4 and the optical disk Adjustment can be made so that the recording surface of D is always substantially perpendicular.

  FIG. 2 is a diagram showing an embodiment of a tilt sensor. As shown in FIG. 2A, the tilt sensor 8 includes a light emitting element 8a, a light receiving element 8b, and a light receiving element 8c. In the tilt sensor 8, each element is provided on a flat surface 8d, and the light receiving element 8b and the light receiving element 8c are provided on both sides of the light emitting element 8a at equal intervals from the light emitting element 8a. The light receiving surfaces of the light receiving element 8b and the light receiving element 8c are substantially the same height from the plane 8d.

The light emitting element 8 a of the tilt sensor 8 is connected to the tilt angle adjusting unit 9 and emits light according to a control signal from the driver 6. The light receiving element 8b and the light receiving element 8c are connected to the tilt angle adjusting unit 9 and output a signal corresponding to the amount of received light to the tilt angle adjusting unit 9. The tilt angle adjusting unit 9 calculates a difference between the signal output from the light receiving element 8b and the signal output from the light receiving element 8c, and outputs a signal corresponding to the calculation result to the servo circuit 7, so that the optical pickup 4 The tilt servo mechanism 4a is controlled. As described above, the tilt sensor 8 is attached in the vicinity of the optical pickup 4, and when the shaft 21 is rotated by the rotation adjusting unit 23, the amount of change in the tilt angle between the optical pickup 4 and the tilt sensor 8. Are the same. Therefore, the tilt sensor 8 can detect an angular deviation (tilt) between the light beam emitted from the optical pickup 4 and the recording surface of the optical disc D almost accurately.

  As shown in FIG. 2B, in a state where the recording surface of the optical disc D and the optical axis of the light beam emitted from the optical pickup 4 are substantially perpendicular to the light receiving element 8b of the light beam emitted from the light emitting element 8a. Is substantially equal to the optical path length of the light beam emitted from the light emitting element 8a to the light receiving element 8c. Therefore, the light receiving amounts of the light receiving element 8b and the light receiving element 8c are substantially the same, and the difference between the output signal of the light receiving element 8b and the output signal of the light receiving element 8c is substantially zero. No control signal is output to the tilt servo mechanism 4a.

  On the other hand, as shown in FIGS. 2C and 2D, the recording surface of the optical disc D and the optical axis of the light beam emitted from the optical pickup 4 are not substantially perpendicular and have a certain angle. The optical path length of the light beam emitted from the light emitting element 8a to the light receiving element 8b is different from the optical path length of the light beam emitted from the light emitting element 8a to the light receiving element 8c. Therefore, the amount of received light is different between the light receiving element 8b and the light receiving element 8c, and a difference occurs between the output signal of the light receiving element 8b and the output signal of the light receiving element 8c. In such a normal state, the tilt angle adjusting unit 9 outputs a control signal corresponding to the difference between the output signals to the tilt servo mechanism 4a so that the optical axis of the optical pickup 4 is substantially perpendicular to the optical disc D. .

  As described above, in the optical disc recording apparatus 1, the tilt angle of the optical disc is detected by the tilt sensor 8, and the control signal for correcting the tilt angle is output to the tilt servo mechanism 4a by the tilt angle adjusting unit 9, so that the optical pickup Control is performed such that the optical axis 4 is always substantially perpendicular to the recording surface of the optical disc D.

  Next, a characteristic operation of the optical disc recording apparatus according to the embodiment of the present invention will be described. When the microcomputer 11 of the optical disc recording apparatus 1 records data on the optical disc D, whether the ID is recorded on the optical disc D, and when the ID is recorded, the memory 11 is associated with the tilt angle. Check whether the information is stored. The microcomputer 11 measures the tilt angle of the optical disc D by the tilt sensor 8 as described above when the ID is not recorded on the optical disc D and when the information on the tilt angle of the optical disc D is not recorded in the memory 11. To do. Then, based on the measurement result, in order to perform control so that the optical axis of the optical pickup 4 is substantially perpendicular to the optical disc D, an initial value of the tilt angle is set, and this tilt angle is set to the tilt servo mechanism 4a. Start data recording after setting.

  At this time, if no ID is recorded on the optical disc D, the microcomputer 11 of the optical disc recording apparatus 1 sets a unique ID number for the optical disc D, and assigns this ID number to the optical disc D. Record. The ID of the optical disk D is preferably recorded in the PMA or the lead-in area when data is recorded on the optical disk D for the first time.

  Further, the microcomputer 11 stores the tilt angle information measured from the tilt sensor 8 as described above in the memory 12 in association with the ID of the optical disc D. The microcomputer 10 uses the control signal output from the tilt angle adjusting unit 9 to the servo circuit 7 to make the optical axis of the optical pickup 4 substantially perpendicular to the recording surface of the optical disk D as tilt angle setting information. You may make it memorize | store in the memory 12 with ID of the optical disk D. FIG.

  On the other hand, when the tilt angle information of the optical disc D is stored in the memory 12 in association with the ID, the optical disc recording apparatus 1 reads the tilt angle information from the memory 12 and sets it to the current tilt angle. . That is, the tilt angle of the optical pickup 4 is set based on the tilt angle information read from the memory 12. The microcomputer 11 adds data to the optical disc D while turning on the tilt servo and operating the tilt servo mechanism 4a.

  Since the optical disc recording apparatus 1 performs the above-described operation, the tilt angle set when data is first recorded on the optical disc D can be set as the tilt angle that is set when data is additionally recorded on the optical disc D. Therefore, it is possible to record data under the same conditions as the first time even when appending. As a result, it is possible to prevent a write error from occurring due to variations in the setting value of the tilt angle.

  Next, the operation of the optical disk recording apparatus according to the embodiment of the present invention will be described based on a flowchart. FIG. 3 is a flowchart for explaining the operation of the optical disk recording apparatus. When the microcomputer 11 of the optical disk apparatus 1 detects that the optical disk D is set on the rotary table 2 (s1), it transmits a signal to the servo circuit 7 to rotate the spindle motor 3 to the driver 6 and the optical pickup 4 It is confirmed whether or not the ID of this optical disk D is recorded in the lead-in area or PMA of the optical disk D (s2). When an ID is recorded on the optical disc D, the microcomputer 11 subsequently checks whether or not the ID of the optical disc D is registered in the memory 12 (s3). When the ID of the optical disk D is not registered in the memory 12, the microcomputer 11 operates the tilt sensor 8 via the servo circuit 7 and the driver 6, and the tilt angle adjusting unit 9 detects the tilt angle of the optical disk D ( s4). Also, in the case where no ID is recorded on the optical disc D in step s2, the process of step s4 is performed.

  The tilt angle adjustment unit 9 generates a control signal for operating the tilt servo mechanism 4a of the optical pickup 4 so that the optical axis of the optical pickup 4 is substantially perpendicular to the recording surface of the optical disc D according to the detected tilt angle. Output to the servo circuit 7 and the microcomputer 11 (s5). The servo circuit 7 controls the tilt servo mechanism of the optical pickup 4 via the driver 6 based on this signal, and sets the optical axis of the optical pickup 4 substantially perpendicular to the optical disc D (s6). Further, the microcomputer 11 stores information included in the signal output from the tilt angle adjusting unit 9 in the memory 12 (s7).

  When the tilt angle of the optical pickup 4 is set, the microcomputer 11 turns on the tilt servo, and always controls the tilt angle of the optical pickup 4 so that the recording surface of the optical disc D and the optical axis of the light beam are substantially perpendicular. While (s8), data is recorded on the optical disc D (s9). The microcomputer 11 ends the process when the data recording ends (s10).

  On the other hand, if the ID of the optical disk D is registered in the memory 12 in step s3, the microcomputer 11 reads the tilt angle information associated with the ID of the optical disk D from the memory 12, and the optical pickup 4 A control signal is output to the tilt servo mechanism, and a control signal for setting the tilt angle of the optical disk to a value read from the memory 12 is output to the servo circuit 7 (s11). When the servo circuit 7 receives this signal, it outputs a control signal to the tilt servo mechanism 4a via the driver 6 to set the tilt angle of the optical pickup 4 to the tilt angle read from the memory 12 (s12).

  Subsequently, the microcomputer 11 outputs a signal to the servo circuit 7 and operates the tilt sensor 8 via the driver 6 to turn on the tilt servo to constantly control the tilt angle of the optical pickup 4 (s8), while the optical disk D is being controlled. The data is recorded in (s9). The microcomputer 11 ends the process when the data recording ends (s10).

  As described above, in the optical disc apparatus according to the embodiment of the present invention, when data is recorded on the optical disc for the first time, the tilt angle of the optical disc D is measured and stored in the memory. In the case of additionally writing data, it is possible to prevent data writing errors by reading the tilt angle information from the memory so that the data recording conditions of the optical disk are almost the same as before.

1 is a block diagram showing a schematic configuration of an optical disc apparatus according to an embodiment of the present invention. It is the figure which showed one Embodiment of the tilt sensor. It is a flowchart for demonstrating operation | movement of an optical disk recording device.

Explanation of symbols

1-optical disk recording device 2-rotating table 3-spindle motor
4-optical pickup, 4a-tilt servo mechanism, 5-RF amplifier,
6-driver, 7-servo circuit, 8-tilt sensor, 9-tilt angle adjustment unit,
10-microcomputer, 11-memory

Claims (4)

A rotating means for rotating the set optical disc;
Measuring means for measuring the tilt angle of the optical disk at that time with respect to the optical disk rotated by the rotating means;
A recording means for recording data by irradiating an optical disk with a light beam;
Tilt servo means for adjusting the tilt angle of the recording means based on the tilt angle of the optical disk measured by the measuring means;
In an optical disk recording apparatus comprising:
Storage means for storing the tilt angle of the optical disk measured by the measurement means for each optical disk;
When the tilt servo means records data on the optical disc, the tilt servo means adjusts the tilt angle of the recording means to the tilt angle of the optical disc stored in the storage means, and then sets the tilt angle of the optical disc measured by the measuring means. Based on the tilt angle of the recording means,
The recording means records the ID on the optical disc if the storage means does not store the tilt angle of the optical disc when data is recorded on the optical disc,
The optical disk recording apparatus, wherein the storage means stores the tilt angle of the optical disk in association with an ID recorded on the optical disk. A rotating means for rotating the set optical disc;
Measuring means for measuring the tilt angle of the optical disk at that time with respect to the optical disk rotated by the rotating means;
A recording means for recording data by irradiating an optical disk with a light beam;
Tilt servo means for adjusting the tilt angle of the recording means based on the tilt angle of the optical disk measured by the measuring means;
In an optical disk recording apparatus comprising:
Storage means for storing the tilt angle of the optical disk measured by the measurement means for each optical disk;
When the tilt servo means records data on the optical disc, the tilt servo means adjusts the tilt angle of the recording means to the tilt angle of the optical disc stored in the storage means, and then sets the tilt angle of the optical disc measured by the measuring means. An optical disk recording apparatus characterized in that an inclination angle of the recording means is adjusted based on the information.   3. The storage unit according to claim 2, wherein the storage unit stores the tilt angle of the optical disc measured by the measurement unit unless the tilt angle of the optical disc is stored when the recording unit records data on the optical disc. Optical disk recording device. If the storage means does not store the tilt angle of the optical disc, the recording means records the ID on the optical disc,
The optical disk recording apparatus according to claim 3, wherein the storage unit stores the tilt angle of the optical disk in association with an ID recorded on the optical disk.

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