JP3968721B2 - Optical disk device - Google Patents

Description

  The present invention relates to an optical disc apparatus for recording data on an optical disc such as a CD or a DVD set in a main body.

  Conventionally, an optical disk apparatus capable of recording data on an optical disk such as a CD or a DVD has been put into practical use and has been widely used. As is well known, there are two types of optical disks that can record data (hereinafter referred to as recordable optical disks): write-once type and rewritable type. In addition, the recordable optical disc is provided with an OPC area used for determining the power of the laser beam irradiated when data is recorded. In the recordable optical disk, if the power of the laser beam irradiated at the time of data recording is not appropriate, when the recorded data is reproduced, the jitter or error rate in the reproduced signal is bad and the recorded data may not be reproduced. Therefore, when a conventional general optical disk apparatus records data on an optical disk, it records a test signal by changing the power of the laser beam irradiated in the OPC area stepwise, and the jitter or error rate of the recorded test signal is recorded. Etc. are measured as recording characteristics, and an OPC process is performed in which the power of laser light (optimum recording power) when the recording characteristics are optimal is determined as the power of laser light at the time of recording.

In addition, in order to shorten the time required for the OPC processing and improve the measurement accuracy of the optimum recording power, the recording conditions such as the data recording speed and the recording strategy at the time of the OPC processing are stored for each type of the optical disc, Patent Documents 1 and 2 propose performing OPC processing using recording conditions stored for a target optical disk.
JP 2002-163825 A JP 2003-59047 A

  However, the conventional optical disk apparatus only determines the irradiation power of the laser beam, in which the recording characteristics such as jitter and error rate are optimized in the optical disk apparatus for recording data by OPC processing. On the other hand, the optical disc has different data recording characteristics depending on the type, and the optical disc apparatus has an optical disc with good data recording characteristics (an optical disc with good compatibility) and an optical disc with poor data recording characteristics (an optical disc with poor compatibility). ) Is said to be. Moreover, it is said that even in the same type of optical disc apparatus, the types of optical discs having good compatibility are different. If data is recorded on an incompatible optical disk, the recording characteristics of the recorded data are poor and reproduction may not be possible (data recording may fail). In order to prevent such a situation from occurring, the user of the optical disk device may be made to recognize the type of the optical disk that is incompatible with the user so that the user does not use the optical disk of the type that is incompatible. However, as described above, even in the same type of optical disc apparatus, the types of optical discs having good compatibility are different, and it is difficult for the user to recognize the types of optical discs having poor compatibility. For this reason, there is a problem in that it is difficult to prevent the user from using data of an incompatible type and prevent data recording from failing.

  An object of the present invention is to provide an optical disc apparatus that can prevent a user from using an incompatible type of optical disc and sufficiently prevent data recording from failing.

  The optical disc apparatus of the present invention has the following configuration in order to solve the above problems.

(1) In an optical disc apparatus provided with recording means for recording data on an optical disc set in the main body,
Measuring means for measuring a jitter value and an error rate in a predetermined recording area as recording characteristic information for an optical disk on which data is recorded after data recording by the recording means is completed;
Media ID acquisition means for acquiring a media ID indicating the type of the optical disc on which data is recorded;
Storage means for storing the media ID acquired by the media ID acquisition means in association with the recording characteristic information measured by the measurement means;
Output means for outputting the recording characteristic information of the optical disk based on the storage contents of the storage means,
The output means outputs the recording characteristic information of the optical disk when an optical disk on which data is recorded by the recording means is set in the main body.

  In this configuration, when data is recorded on the optical disk by the recording means, the recording characteristic information including the jitter value and error rate of the recorded data is measured. Further, the media ID acquisition means acquires a media ID indicating the type of the optical disk. On a general optical disc, a media ID indicating the type is recorded in advance. The media ID acquisition means acquires the media ID indicating the type of the optical disc by reading the media ID. The storage means stores the media ID and recording characteristic information in association with each other. Then, when an optical disk for recording data is set by the output means, the recording characteristic information stored in the storage means is output in association with the type of the optical disk. This makes it possible for the user to reliably recognize the compatibility between the optical disk on which data is recorded and the apparatus main body, and prevents the user from using an incompatible optical disk and fails to record data. Can be sufficiently prevented.

  (2) The measuring means measures the jitter value and error rate in the recording area on the outer peripheral portion of the optical disc as recording characteristic information.

  In this configuration, the jitter value and error rate in the recording area on the outer periphery of the optical disc are measured as recording characteristic information. In general, the recording characteristics of data on an optical disc become worse as the outer periphery side. Therefore, it is possible to determine whether the compatibility between the optical disk and the apparatus main body is high or not, and to allow the user to recognize the result.

  (3) The output means also outputs information indicating a recording area where data can be recorded at an appropriate level for an optical disc having recording characteristics lower than a predetermined level.

  In this configuration, the user can be encouraged to use the recording area on the inner circumference side with relatively good recording characteristics, and can be urged not to use the recording area on the outer circumference side that is likely to fail in data recording. . Accordingly, it is possible to suppress the failure of data recording even for an incompatible optical disk and to effectively use the recording area on the inner periphery side where the possibility of data recording failure is low.

  (4) The output means outputs rank data based on recording characteristics for the optical disk storing the media ID in the storage means when a specific input is made to the apparatus main body.

  In this configuration, since the recording characteristics according to the type of the optical disk are output as rank data, it is possible to allow the user to recognize an optical disk of good compatibility and an optical disk of poor compatibility.

  According to the present invention, the compatibility between the optical disc on which data is recorded and the main body of the apparatus can be surely recognized by the user, and the user can be prevented from using an incompatible type of optical disc to record data. It can prevent failure enough.

  Hereinafter, an optical disk apparatus according to an embodiment of the present invention will be described.

  FIG. 1 is a block diagram showing the configuration of the main part of an optical disc apparatus according to an embodiment of the present invention. An optical disc apparatus 1 according to this embodiment includes a control unit 2 that controls the operation of the apparatus main body, a pickup head 3 that irradiates a laser beam onto an optical disk 10 set in the apparatus main body, and records data or reads data. The servo control unit 4 that adjusts the irradiation position of the laser beam emitted from the pickup head 3 and the recording data to be recorded on the optical disc 10 are encoded, and the laser beam emitted from the pickup head 3 to the optical disc 10 is based on the encoded data. A recording unit 5 to be controlled, a reproduction unit 6 that decodes a read signal read from the optical disk 10 by the pickup head 3 and outputs the decoded signal as a reproduction signal, and a display unit 7 that displays recording characteristic information are provided.

  The control unit 2 is provided with a storage unit 2a that stores recording characteristic information including a jitter value and an error rate for each type of the optical disc 10 on which data is recorded by the apparatus main body. As shown in FIG. 2, the storage unit 2a stores a media ID indicating the type of the optical disc 10, a disc name, recording characteristic information, and the number of samples in association with each other. As described above, the recording characteristic information includes the jitter value and the error rate. The number of samples is the number of optical disks 10 used to acquire this recording characteristic information. The recording characteristic information is obtained by recording measurement data on a track on the outer periphery of the optical disc 10 and actually measuring the measurement data. In the optical disc 10, the data recording characteristics are deteriorated toward the outer periphery. Accordingly, the recording characteristic information stored in the storage unit 2a indicates a recording characteristic of the lowest level for the optical disc 10 of that type.

  The pickup head 3 is attached to a shaft extending in the radial direction of the optical disk 10 set in the main body, and a feed mechanism unit (not shown) provided in the servo control unit 4 drives the thread motor 4a to pick up the pickup head. 3 is moved in the radial direction of the optical disk 10 along this axis. The pickup head 3 is provided with a biaxial actuator (not shown) for moving the lens toward and away from the optical disk 10 and in the radial direction of the optical disk 10. Although not shown, the pickup head 3 includes a light emitting element for irradiating the optical disk 10 with laser light and a light receiving element for receiving reflected light from the optical disk 10. Further, the servo mechanism unit 4 moves the lens provided in the pickup head 3 in the direction of contacting and separating from the optical disk 10 based on a known focus error signal (FE signal), and the pickup head 3 emits light. Based on a focus servo mechanism (not shown) that performs focus servo control for condensing the laser beam emitted from the element onto the recording surface of the optical disc 10 and a known tracking error signal (TE signal), the lens is attached to the optical disc 10. A tracking servo mechanism (not shown) that performs tracking control for irradiating a target track with laser light emitted from the light emitting element of the pickup head 3 is provided. The movable amount of the lens by the focus servo mechanism unit and the tracking servo mechanism unit is several hundred μm. The feed mechanism unit moves the pickup head 3 in the radial direction of the optical disc when the target track cannot be irradiated with the laser beam emitted from the light emitting element of the pickup head 3 only by moving the lens by the tracking servo mechanism unit. Tracking control is performed by combining the movement of the pickup head 3 by the feeding mechanism and the movement of the lens by the tracking servo mechanism.

  The recording unit 5 encodes the input recording data, turns on / off the laser light applied to the optical disc 10 from the light emitting element provided in the pickup head 3 based on the encoded data, and stores the encoded recording data. Recording on the optical disk 10. The reproducing unit 6 decodes the read signal that is the output of the light receiving element of the pickup head 3 that has received the reflected light from the optical disc 10, and outputs this as a reproduced signal.

  Next, the operation of the optical disc apparatus 1 of this embodiment will be described. The optical disk apparatus 1 of this embodiment reproduces data recorded on the optical disk 10 set in the main body when a remote control device (not shown) or a reproduction key of an operation unit provided in the main body is operated. Perform playback processing. This reproduction process is the same as that of a known apparatus. The optical disk 10 set in the main body is rotated by a spindle motor, and the recording surface of the optical disk 10 is irradiated with the laser light emitted from the light emitting element of the pickup head 3. The output of the light receiving element of the pickup head 3 that receives the reflected light is input to the reproducing unit 6 as a read signal. The reproduction unit 6 decodes the input read signal and outputs the decoded signal as a reproduction signal. In this reproduction process, the servo control unit 4 performs focus servo based on the focus error signal and tracking servo based on the tracking error signal, and adjusts the recording position (track) for reading the data recorded from the optical disc 10. To do. Since control related to the focus servo and tracking servo is well known, detailed description thereof is omitted here.

  Next, a recording process in the optical disc apparatus 1 according to the embodiment of the present invention will be described. The optical disc apparatus 1 of this embodiment executes a recording process for recording data on the optical disc 10 set in the main body when a remote controller or a recording key of an operation unit provided in the main body is operated. FIG. 3 is a flowchart showing recording processing in the optical disc apparatus of this embodiment. The optical disc apparatus 1 reads the media ID indicating the type from the optical disc 10 set in the main body, that is, the optical disc 10 from which data is to be recorded (s1). The optical disk device 1 searches the storage unit 2a using the media ID read in s1 as a key (s2). If this media ID is stored, the associated recording characteristic information is read and the display unit 7 (S3, s4). If the corresponding media ID is not stored, the fact is displayed on the display unit 7 (s3, s5).

  Although processing for storing the recording characteristic information in the storage unit 2a will be described later, the recording characteristic information is stored on the basis of an actual measurement value obtained by measuring a jitter value and an error rate for the optical disc 10 on which data has been recorded in the past. .

  4A and 4B are display examples of the display unit 7 at s4, and FIG. 4C is a display example of the display unit 7 at s5. In s4, when the recording characteristic information is higher than a predetermined level, in other words, the compatibility with the apparatus main body is good and the optical disc 10 is set in the main body, recording is performed on the display unit 7 as shown in FIG. A message indicating that the optical disc 10 set in the main body is a compatible optical disc 10 is displayed together with the characteristic information. On the other hand, when the recording characteristic information is lower than a predetermined level, in other words, incompatible with the apparatus main body and the optical disc 10 is set in the main body, recording is performed on the display unit 7 as shown in FIG. Characteristic information, a message indicating that the optical disk 10 set in the main body is incompatible with the optical disk 10 and an area where data recording on the optical disk 10 does not fail are displayed. As is well known, since the data recording characteristics of the optical disc 10 decrease as the outer circumference decreases, data recording does not fail in the recording area on the inner circumference side even if the optical disc 10 has poor compatibility. Therefore, by performing the display shown in FIG. 4B, even if the optical disc 10 is not compatible with the apparatus main body, the user can recognize the recording area where there is no problem even if data is recorded. The recording area can be used effectively. A recording area that does not hinder the recording of data is calculated based on the recording characteristic information stored in the storage unit 2a. In s5, as shown in FIG. 4C, a message indicating that the recording characteristic information is not stored is displayed on the display unit 7.

  When the display by s4 or s5 is performed, the optical disc apparatus 1 waits for a definite input as to whether or not to record data (s6). The user recognizes from the display on the display unit 7 that the incompatible optical disk 10 is set in the main body, and inputs the data recording when replacing the optical disk 10 for recording data. The optical disk apparatus 1 ends this process when an input indicating that data recording is not performed is performed. Therefore, it is possible to prevent the user from recording data on the optical disc 10 having poor compatibility with the apparatus main body, and as a result, failure to record the data, thereby improving the usability of the user.

  The optical disc apparatus 1 records the data on the optical disc (s7) when the confirmation input for recording the data is performed in s6. In s7, first, the OPC process is executed in the OPC area of the optical disc 10 to determine the optimum recording power. The recording unit 5 encodes the input recording data, and controls the laser light emitted from the light emitting element of the pickup head 3 based on the encoded data to record the encoded recording data on the optical disk 10.

  When the recording of data relating to s7 is completed, the optical disc apparatus 1 determines whether or not measurement data is recorded on the outermost track of the optical disc 10 on which the current data is recorded (s8). The measurement data is data recorded on the optical disc 10 by the optical disc apparatus 1 to measure the recording characteristics. The optical disc 10 on which the measurement data is not recorded is the optical disc 10 on which data is recorded for the first time in the apparatus main body. is there. If the optical disk apparatus 1 determines that the measurement data is recorded in s8, the process is terminated. On the contrary, if the measurement data is not recorded, a recording characteristic information measurement process for measuring the recording characteristic information is performed for this optical disc 10 (s9), and this process is terminated.

  FIG. 5 is a flowchart showing the recording characteristic information measurement process. The optical disc apparatus 1 records measurement data on the outermost track of the optical disc 10 (s11). This measurement data is predetermined data. When the recording of the measurement data is completed, the optical disc apparatus 1 reproduces the measurement data recorded this time and measures recording characteristics including a jitter value, an error rate, and the like (s12). Then, the media ID of the optical disc 10 is acquired (s13), and it is determined whether the corresponding media ID is stored in the storage unit 2a (s14). If the corresponding media ID is not recorded in the storage unit 2a, a record in which the recording characteristic information measured this time is associated with the media ID is newly created and stored (s15). At this time, the number of samples is one. The disk name may be input by the user, or may be automatically acquired from the network if it has a function of connecting to a network such as the Internet.

  On the contrary, if the corresponding media ID is recorded in the storage unit 2a, the number of samples of the corresponding record is counted up, and the average value such as jitter value and error rate is added by adding the recording characteristic information measured this time. The recording characteristic information updating process is performed to calculate and update to the calculated value (s16).

  As described above, the measurement data is recorded on the outermost track of the optical disc 10 by the main body, and the jitter value, error rate, and the like of the measurement data are stored in the storage unit 2a as recording characteristic information. Therefore, it is possible to appropriately determine whether the compatibility with the apparatus main body is good or bad. For the same type of optical disc 10, since the average value such as jitter value and error rate is used as the recording characteristic information, the reliability of the recording characteristic information can be ensured.

  Furthermore, since the optical disc apparatus 1 of this embodiment allows the user to recognize whether or not the optical disc 10 set in the main body is compatible with the main body before starting data recording, the user is incompatible. It is possible to suppress the use of the type of optical disk 10 and to sufficiently prevent data recording failure.

  Further, when a specific input operation is performed on the remote controller or the operation unit, the optical characteristics of the optical disk 10 storing the recording characteristic information in the storage unit 2a are good on the display unit 7 as shown in FIG. They may be arranged in order and displayed as rank data. In this way, the user can easily check the optical disk 10 having good compatibility with the apparatus main body, and the user can be prevented from purchasing the optical disk 10 having poor compatibility with uselessness. In other words, the user can purchase the optical disc 10 having good compatibility with the apparatus main body.

It is a block diagram which shows the structure of the principal part of the optical disk apparatus which is embodiment of this invention. It is a figure which shows the recording characteristic information which the control part of the optical disk apparatus which is embodiment of this invention memorize | stores. It is a flowchart which shows the recording process in the optical disk apparatus of this embodiment. It is a figure which shows the example of a display of the display part of the optical disk apparatus of this embodiment. It is a flowchart which shows the recording characteristic information measurement process in the optical disc apparatus of this embodiment. It is a figure which shows the example of a display of the display part of the optical disk apparatus of this embodiment.

Explanation of symbols

1-optical disk device 2-control unit 2a-storage unit 3-pickup head 4-servo control unit 5-recording unit 6-reproducing unit 7-display unit 10-optical disk

Claims (5)

In an optical disc apparatus provided with a recording means for recording data on an optical disc set in a main body,
Measuring means for measuring recording characteristic information including a jitter value and an error rate in the recording area of the outer peripheral portion of the optical disc on which data is recorded after data recording by the recording means is completed;
Media ID acquisition means for acquiring a media ID indicating the type of the optical disc on which data is recorded;
Storage means for storing the media ID acquired by the media ID acquisition means in association with the recording characteristic information measured by the measurement means;
Output means for outputting the recording characteristic information of the optical disk based on the storage contents of the storage means,
The output means outputs the recording characteristic information of the optical disc when the optical disc on which data is recorded by the recording means is set in the main body,
In addition, for an optical disc whose recording characteristics are lower than a predetermined level, information indicating a recording area where data can be recorded at an appropriate level is also output,
Furthermore, when there is a specific input to the apparatus main body, an optical disk apparatus that outputs rank data based on recording characteristics for an optical disk storing a media ID in the storage means. In an optical disc apparatus provided with a recording means for recording data on an optical disc set in a main body,
Measuring means for measuring recording characteristic information including a jitter value and an error rate in a predetermined recording area for an optical disk on which data has been recorded after completion of data recording by the recording means;
Media ID acquisition means for acquiring a media ID indicating the type of the optical disc on which data is recorded;
Storage means for storing the media ID acquired by the media ID acquisition means in association with the recording characteristic information measured by the measurement means;
Output means for outputting the recording characteristic information of the optical disk based on the storage contents of the storage means,
The output means is an optical disc apparatus for outputting the recording characteristic information of the optical disc when an optical disc on which data is recorded by the recording means is set in a main body.   3. The optical disc apparatus according to claim 2, wherein the measuring unit measures a jitter value and an error rate in a recording area on an outer peripheral portion of the optical disc as recording characteristic information.   4. The optical disc apparatus according to claim 2, wherein the output means also outputs information indicating a recording area where data can be recorded at an appropriate level for an optical disc having recording characteristics lower than a predetermined level.   The output means outputs rank data based on recording characteristics for an optical disk storing a media ID in the storage means when a specific input is made to the apparatus main body. The optical disk device described.

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