JP2009129505A - Optical disk initializing unit and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily position the inner and outer circumference ends of a BCA code at the same position in a circumferential radial direction and set the position thereof within the tolerance, in an optical disk initializing unit and method which performs initialization and BCA code recording continuously. <P>SOLUTION: The process controller performs initialization at least over one turn of the rotating means in the initialization area of the inner and outer circumferences adjoining the identification information recording area in the radial direction by using the initializing means without radial movement by the radial moving means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disc initialization apparatus that initializes a recording layer of an optical disc by irradiating the optical disc with a laser beam, and records identification information including an initialization portion and a non-initialization portion at a predetermined radial position of the optical disc, and The present invention relates to an optical disc initialization method.

  Conventionally, in order to prevent unauthorized copying of an optical disc, bar-code data is recorded in a place called BCA (burst cutting area) in the innermost periphery of the optical disc. Individual information such as a serial number and identification number (ID) is recorded in this bar code data, and the optical disk is managed using these information to prevent unauthorized copying of the optical disk. ing. This barcode data (hereinafter referred to as a BCA code) is data composed of a plurality of bars having different intervals. This data is data obtained by converting (encoding) original data of a BCA code (hereinafter referred to as BCA data), which is individual information such as a serial number and an identification number, by predetermined data conversion.

  In a phase change optical disc, since the recording layer has a low reflectance at the stage when the optical disc is produced, a process called initialization for crystallizing the recording layer is required to enable data recording. BCA code recording is also required, but if initialization and BCA code recording are performed separately, the optical disk must be transferred by two devices, resulting in poor production efficiency. Therefore, for example, as shown in Patent Document 1, in a predetermined radius region, a laser beam is irradiated in a pulse shape so that an initialization part (high reflectance part) and an uninitialized part (low reflectance part) are formed. The BCA code is recorded by making it, and the other radius region is irradiated with laser light of a constant intensity to perform initialization, thereby switching between initialization and BCA code recording continuously. .

  The recording of the BCA code will be described below. When the optical disk is rotated and the irradiation position of the laser beam is moved in the radial direction, as shown in FIG. 7, the elliptical light spot SP formed on the optical disk is fixed when the optical disk is viewed. The laser beam intensity is high and the area where the laser beam intensity is high is initialized to have high reflectivity, and the area where the laser beam intensity is low is left as a bar with low reflectivity. . By controlling the emission timing of the pulsed laser light with respect to the rotation, the locations in the circumferential direction of the high reflectivity and low reflectivity are formed at the same position at each radial position, and the BCA code is recorded in a predetermined radius area of the optical disc. can do.

Since the inner area and the outer area of the radius area for recording the BCA code are areas to be initialized, as shown in Patent Document 1, the light spot SP is changed from the inner circumference side to the outer circumference side. First, the inner area of the radius area for recording the BCA code is initialized, then the BCA code is recorded in the radius area for recording the BCA code, and then the outer area of the radius area for recording the BCA code. Is to be initialized.
JP 2004-127514 A

  According to this, since the processing is continuously performed, the initialization and the recording of the BCA code can be performed efficiently, but the light spot SP is moved in the circumferential direction and the radial direction, that is, in a spiral shape. Since the light spot SP is moved, the radial position at the inner peripheral side end and the outer peripheral side end of the BCA code is different in the peripheral direction as shown in FIG. Become.

For this reason, there are the following problems.
1) The permissible range A of the radial position at the inner and outer ends of the BCA code is determined by the standard (for example, ± 60 μm for DVD), and the recording radius position and end radius position of the BCA code are set appropriately. Thus, even if the inner and outer ends of the BCA code are set within the allowable range A (within the range indicated by the broken line in FIG. 8), there is eccentricity in the optical disc. There is a possibility that the radial positions at the inner peripheral end and the outer peripheral end of a part of the cord do not fall within the allowable range A.
2) Increasing the size of the light spot SP and increasing the radial feed pitch in one rotation of the optical disc improves the production efficiency because initialization and recording of the BCA code can be performed in a short time. When the size of the light spot SP is increased and the feed pitch in the radial direction is increased, the radial positions at the inner peripheral side end and the outer peripheral side end of a part of the BCA code are not within the allowable range A.

  The present invention has been made in view of such circumstances. In an optical disc initialization apparatus or an optical disc initialization method for continuously performing initialization and recording of a BCA code, the inner end of the BCA code can be easily detected. To provide an optical disc initialization apparatus and an optical disc initialization method capable of making the radial position in the circumferential direction at the outer peripheral side end the same and making the radial position at the inner peripheral side end and the outer peripheral side end of the BCA code within an allowable range. It is in.

  The optical disk initialization apparatus according to claim 1, wherein the processing control means uses an initialization means that is not accompanied by a radial movement by the radial movement means in the initialization area adjacent to the identification information recording area on the inner circumference side and the outer circumference side. Initialization is performed over at least one rotation by the rotation means.

  In the optical disc initialization apparatus according to claim 2, the processing control means performs initialization by the initialization means accompanied by the radial movement by the radial movement means in the initialization area on the inner circumference side of the identification information recording area, The initialization area adjacent to the identification information recording area is initialized by the initialization means without the radial movement by the radial movement means, and the radial movement by the radial movement means is performed in the identification information recording area. In the initialization area adjacent to the identification information recording area, the initialization information is recorded by the initialization means without radial movement by the radial movement means. In the initialization area on the outer peripheral side of the identification information recording area, initialization is performed by the initialization means accompanied by the radial movement by the radial movement means.

  In the optical disk initialization apparatus according to claim 3, when the processing control means detects the radial position of the inner peripheral side end or the outer peripheral side end of the identification information recording area when the radial position detection means detects the radial position at the inner peripheral side end, the initialization means Initialization is continued, initialization at the outer peripheral side is started by the initialization means, and the radial movement by the radial movement means is stopped until the specific rotational position detection means detects the specific position more than once. To do.

  The optical disc initialization method according to claim 4 initializes the recording layer of the optical disc without the radial movement of the laser light irradiation position by the initialization ramps on the inner peripheral side and the outer peripheral side adjacent to the identification information recording area. The laser light irradiation with a predetermined intensity is performed in at least one rotation of the optical disk.

  According to the first and fourth aspects of the invention, the initialization without the radial movement is performed in the inner peripheral side and the outer peripheral side inclining areas adjacent to the identification information recording area (BCA code recording area). Therefore, the radial position in the circumferential direction at the inner peripheral side end and the outer peripheral side end of the BCA code can be made the same, and the radial position at the inner peripheral side end and the outer peripheral side end of the BCA code is within an allowable range. Is possible.

  According to the invention of claim 2, from the innermost circumference side of the optical disc, initialization with radial feed, initialization without radial feed, recording identification information (BCA code), initialization without radial feed, Since processing is performed in a series of operations in the order of initialization with radial feed, production efficiency can be maintained.

  According to the invention of claim 3, when the radial position detecting means detects the radial position of the inner peripheral side end or the outer peripheral side end of the identification information recording area (BCA code recording area), an initializing means is used at the inner peripheral end. Since the initialization by the initialization means is started at the outer peripheral end and the radial movement by the radial movement means is stopped until the specific rotational position detection means detects the specific position more than once, Initialization without radial movement at the inner or outer end of the identification information recording area (BCA code recording area) can be performed for one or more revolutions of the optical disk, and no new complicated circuit or mechanism is required. The cost increase of the apparatus can be suppressed.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. An optical disc initialization apparatus according to an embodiment of the present invention initializes a recording layer of an optical disc by irradiating the optical disc with laser light, and also includes identification information (initialized location and non-initialized location) at a predetermined radial position of the optical disc. BCA code).

  FIG. 1 is a configuration diagram showing the overall configuration of an optical disc initialization apparatus to which the present invention is applied. 2 to 4 are flowcharts of programs executed by the controller of the optical disc initialization apparatus. FIG. 5 is an explanatory diagram showing detection points of radius values to be detected together with the light spot and the initialization and non-initialization locations on the optical disc. FIG. 6 is an explanatory diagram showing how the BCA code is recorded at the boundary between the initialization gradient area and the BCA code recording area in the present invention.

  FIG. 1 initializes a recording layer of a phase change optical disc (hereinafter simply referred to as an optical disc DK), and includes identification information (BCA code) including an initialization location and a non-initialization location at a predetermined radial position of the optical disc DK. An optical disc initialization apparatus for recording. As shown in FIG. 1, the optical disc initialization apparatus 1 includes an optical pickup 200, a controller 400 including a display device 402 and an input device 404, a signal amplification circuit 100, a focus error signal generation circuit 102, a focus servo circuit 104, and a drive circuit 106. , Reproduction signal generation circuit 108, binarization circuit 110, data decoding circuit 112, data conversion circuit 202, recording signal generation circuit 204, laser drive circuit 206, clock signal generation circuit 208, spindle motor 212, spindle motor control circuit 210 , A feed motor 300, a feed motor control circuit 304, a radius value detection circuit 302, and the like.

  The optical pickup 200 includes a laser light source, a collimator lens, a polarizing beam splitter, a quarter wavelength plate, an objective lens, a focus actuator, a condensing lens, a knife, a photodetector, and the like. The laser light emitted from the laser light source is converted into parallel light having an oval cross section by the collimator lens, passes through the polarizing beam splitter, enters the objective lens through the quarter-wave plate, and is condensed by the objective lens. Thus, an elliptical light spot SP is formed on the optical disk DK. The laser light reflected by the optical disk DK is converted into parallel light by the objective lens, and enters the polarization beam splitter via the quarter-wave plate. At this time, the polarization direction of the laser beam is rotated 90 degrees from the polarization direction of the laser beam at the time of emission by passing through the quarter wavelength plate twice. For this reason, the laser beam incident on the polarization beam splitter is reflected and incident on the condenser lens, and then incident on the photodetector divided into two or four via the knife. The knife has a tip position at the optical axis position of the laser beam, and is provided for focus servo by the knife edge method. The focus actuator is provided for driving the objective lens in the optical axis direction of the laser beam in the focus servo.

  The data conversion circuit 202 receives the BCA data specific to the optical disc supplied from the controller 400 to the optical disc DK. For example, in the case of a DVD, the data (Blu-ray) has a BCA code bar interval of 1T to 4T. In the case of a disc, the data is converted (encoded) into data from 2T to 5T, and output to the recording signal generation circuit 204.

  The clock signal generation circuit 208 generates a clock signal (for example, 14400 pulses / periphery) as a unit of BCA code recording based on the pulse signal from the encoder of the spindle motor 212 and supplies the clock signal to the recording signal generation circuit 204. The recording signal generation circuit 204 stores the data input from the data conversion circuit 202, and when an index signal from an encoder in the spindle motor 212 is input, from this data, for example, in the case of a DVD, a BCA code bar and A pulse signal having a distance from the bar of 1T to 4T is created. Further, a pulse signal having a waveform (for example, a waveform in which the peak value is increased at the rising portion of the high level) is generated so that the waveform when the BCA code is reproduced from the pulse signal is optimized, and this pulse signal is clocked. Modulated by a signal input from the signal generation circuit 208 and output to the laser drive circuit 206. The modulation by the clock signal is, for example, the clock signal is a signal of 14400 pulses / cycle. For example, when recording a BCA code on a DVD, the BCA code width (low level, non-initialized part) is 10 pulses, The modulation is performed so that 1T of the interval (high level, initialization location) corresponds to 31 pulses.

  The laser drive circuit 206 receives a pulse signal from the recording signal generation circuit 204, and further receives a signal corresponding to the type of laser light irradiation and a signal corresponding to the laser light intensity from the controller 400. Based on these signals, a laser light source in the optical pickup 200 supplies a drive signal for performing laser light irradiation as shown in Table 1 below. Laser light intensities In1 and In2 are laser light intensities at which the recording layer of the optical disk DK is initialized, and In3 is a laser light intensity at which the recording servo of the optical disk DK does not change and a focus servo described later is possible. .

  The spindle motor control circuit 210 receives a rotational speed command from the controller 400, inputs a pulse signal from an encoder built in the spindle motor 212, and the number of pulses per unit time of this pulse signal corresponds to the commanded rotational speed. The rotation speed of the spindle motor 212 is controlled so that the number of pulses is the same. The controller 400 stores three rotation speeds, that is, an initialization rotation speed, a BCA code recording rotation speed, and a BCA data reproduction rotation speed. Since these are all stored as linear velocities, they are converted into rotational speeds in units of (number of revolutions / hour) based on a radius value output from a radius value detection circuit 302 described later, and are sent to the spindle motor control circuit 210 at regular intervals. To output.

  The signal amplification circuit 100 amplifies the signal from the photodetector of the optical pickup 200 and outputs the amplified signal to the focus error signal generation circuit 102 and the reproduction signal generation circuit 108. Focus servo, which is control for focusing the laser beam emitted from the optical pickup 200 on the recording layer of the optical disk DK by the focus error signal generation circuit 102, the focus servo circuit 104, the drive circuit 106, and the focus actuator of the optical pickup 200. Is done. In this embodiment, a knife and a condenser lens are arranged in front of the divided photodetector for receiving the reflected light from the optical disk DK in the optical pickup 200, and focus servo is performed by the knife edge method. However, the focus servo method is not limited to the knife edge method, and for example, a focus servo by an SSD method or the like may be used.

  The reproduction signal generation circuit 108 outputs a signal (that is, a signal corresponding to the intensity of the reflected light) obtained by adding all the signals output from the divided light receiving elements in the optical pickup 200 and amplified by the signal amplification circuit 100. The binarization circuit 110 slices the signal output from the reproduction signal generation circuit 108 at a set level to obtain a pulse signal composed of a high level and a low level. This pulse signal is a pulse signal in which the location of the bar of the BCA code is at a low level and the level between the bars of the BCA code is at a high level. The data decoding circuit 112 operates in response to a command from the controller 400 only when the BCA code is irradiated with laser light and the BCA data is reproduced. When the data decoding circuit 112 receives a pulse start signal from the binarization circuit 110 after receiving an operation start command, the interval between the bars of the BCA code from 1T to 4T in the case of a DVD, for example, from the input pulse signal. Create the data that becomes. This corresponds to data output from the data conversion circuit 202. The BCA data is decoded from the data by performing a conversion opposite to the data conversion performed by the data conversion circuit 202, and the decoded BCA data is output to the controller 400.

  The radius value detection circuit 302 starts driving when the power of the apparatus is turned on, and counts the pulse signals to be input after that, when the pulse signal input from the encoder built in the feed motor 300 stops. Then, the moving distance is calculated, and the radius value is calculated by adjusting to the initial radius value, and is output to the controller 400 and a feed motor control circuit 304 described later.

The feed motor control circuit 304 functions as follows.
When the apparatus is turned on, the driving is started, and the feed motor 300 is driven to the driving limit position (position that is the initial radius value).
When a radius value is input from the controller 400, the driving direction is determined from the radius value input from the radius value detection circuit 302 to drive the feed motor 300, and the radius value input from the radius value detection circuit 302 is input from the controller 400. When the radius value is reached, the drive of the feed motor 300 is stopped.
When a radial feed command is input from the controller 400, the feed motor is set so that the feed speed calculated by counting the pulse signal from the encoder built in the feed motor 300 matches the feed speed input from the controller 400 at regular intervals. 300 rotations are controlled.

  The controller 400 stores a distance (hereinafter referred to as a feed pitch) by which the laser beam irradiation position moves when the optical disk DK rotates once, and this feed pitch is rotated in units of the above-described (number of revolutions / hour). The feed speed is calculated by dividing by the reciprocal of the speed (time of one rotation) and output to the feed motor control circuit 304. The radius value detection point r detected by the radius value detection circuit 302 is a position where a boundary between initialization and non-initialization is formed in the vicinity of the inner peripheral end of the light spot SP, as shown in FIG. Is the position of the lowest laser light intensity where. Then, in the controller 400, the distance L from the position where the radius value indicated by L in FIG. 5 is detected to the position where the boundary between the initialization and the non-initialization is formed in the vicinity of the outer peripheral end of the light spot SP, in other words. The initialization width L when the initialization is performed by moving the light spot SP by one rotation of the optical disk is stored. This value is used when detecting a radial position where movement in the radial direction is stopped, as will be described later.

  In the optical disc initialization apparatus 1 configured as described above, when the operator turns on the power of the apparatus, sets the optical disc DK on the turntable 214, and inputs an initialization start command from the input device 404, the controller 400 2 to 4 are started, initialization of the optical disk DK, recording of a BCA code at a predetermined radius position, and reproduction of BCA data from the recorded BCA code are performed. Hereinafter, it demonstrates along the flow of a program. In the following description of the present embodiment, the reference numerals in parentheses correspond to the reference numerals in FIGS.

  First, the index signal counter n is cleared (S102), the position of the light spot SP formed on the optical disk DK by the laser light emitted from the optical pickup 200 is changed to the optical disk DK which is the initialization start radius position, and the recording layer is placed on the optical disk DK. It moves to a radius position on the innermost circumference (S104). Next, BCA data is output to the data conversion circuit 202, data conversion (encoding) is performed by the data conversion circuit 202, and data serving as a basis of the BCA code is output to the recording signal generation circuit 204 (S106).

  Next, a rotation speed command for initialization is output to the spindle motor control circuit 210, the turntable 214 starts rotating at the rotation speed for initialization (S108), and the laser beam for initialization is sent to the laser drive circuit 206. An irradiation command and a laser intensity command are output, laser light irradiation for initialization is performed from the optical pickup 200 (S110), and an operation command is output to a circuit that drives a focus actuator (not shown) to output the optical pickup 200. The focus actuator drives the objective lens in the optical axis direction of the laser beam, and an operation command is output to the focus servo circuit 104 at the timing when the S-shaped signal generated in the signal output from the focus error signal generation circuit 102 crosses zero. Servo is started (S112). In this state, waiting for the index signal to be input twice from the encoder in the spindle motor 212 (S114 to S120), the radial feed is started (S122). This is to prevent a portion that is not initialized from being generated on the optical disc DK by not performing radial feed more than once after the initialization is started.

  Next, when a value obtained by adding an initialization width L to a radius value (hereinafter, referred to as a detected radius value) input at regular intervals from the radius value detection circuit 302 becomes the radius position of the inner peripheral end of the BCA code (S124—YES). ), A radial feed stop command is output to the feed motor control circuit 304, and the radial feed is stopped (S126). A rotation speed for BCA code recording is output to the spindle motor control circuit 210, and the rotation speed is used for BCA code recording. (S128), and waits for an index signal to be input twice from the encoder in the spindle motor 212 (the optical disk rotates one or more times) (S130 to S136). As a result, all the areas inside the radial position of the inner peripheral end of the BCA code are initialized.

  After the index signal is input twice, a laser beam irradiation command for recording the BCA code and a laser intensity command are output to the laser drive circuit 206, and the laser beam irradiation for recording the BCA code is started from the optical pickup 200. Then, a radial feed command is output to the feed motor control circuit 304 and radial feed is started (S140). Each time an index signal is input to the laser drive circuit 206, a pulse signal for recording a BCA code is input from the recording signal generation circuit 204, so that the BCA code starts to be recorded on the optical disc. Note that when the radial feed is started, the radius value detection point r of the light spot SP is located on the initialization area side by a distance L from the boundary between the initialization area and the BCA code recording area, as shown in FIG. Thus, the BCA code is recorded as the light spot SP moves to the BCA code recording area side. That is, the radial position of the inner peripheral side end of the BCA code can be made the same by performing initialization for one or more rotations of the optical disc DK in the initialization area adjacent to the BCA code recording area.

  When the detected radius value becomes the radial position of the outer peripheral side end of the BCA code (S142-YES), the feed in the radial direction is stopped by the command output to the feed motor control circuit 304 (S144), and the command to the laser drive circuit 206 is sent. The output is changed to laser beam irradiation for initialization (S146), and the rotation speed is changed to the rotation speed for initialization by outputting the rotation speed for initialization to the spindle motor control circuit 210 (S148). Then, it waits for an index signal to be input twice from the encoder in the spindle motor 212 (the optical disk DK rotates one or more times) (S150 to S156). When the radial feed is stopped, the radius value detection point r of the light spot SP is at the boundary between the initialization area and the BCA code recording area, and as shown in FIG. The BCA code formed in (2) is initialized and disappears when the light spot SP moves only in the circumferential direction. That is, the BCA code outer peripheral side end can be made the same radial position by performing initialization for one or more rotations of the optical disc DK after stopping the radial feed in the initialization area adjacent to the BCA code recording area. Then, after the index signal is input twice (after the optical disk DK has rotated one or more times), radial feed is started by a command output to the feed motor control circuit 304 (S158). As a result, the initialization area outside the BCA code recording area is initialized.

  Next, when the value obtained by adding the initialization width L to the detected radius value is the radius position at the end of initialization (S160-YES), the feed in the radial direction is stopped by the command output to the feed motor control circuit 304 (S162). ), And waits for an index signal to be input twice from the encoder in the spindle motor 212 (the optical disk DK rotates one or more times) (S164 to S166). As a result, all the initialization areas outside the BCA code recording area are initialized, and the laser light does not move outside this area, and therefore, the laser light is irradiated to an extra portion or the focus servo is lost. Will disappear.

  Then, after the index signal is input twice (after the optical disk DK has been rotated one or more times), the focus servo is stopped by the command output to the focus servo circuit 104 (S170), and the command output to the laser drive circuit 206 is performed. The laser beam irradiation is stopped (S172), the radius value of the center position of the radius area where the BCA code is recorded is output to the feed motor control circuit 304, and the radius value of the laser beam irradiation position when the laser beam is irradiated is the radius value. Radial movement is performed so as to be a value (S174). Further, the rotation speed is changed to the rotation speed for BCA data reproduction by outputting the rotation speed for BCA data reproduction to the spindle motor control circuit 210 (S176), and the laser for BCA data reproduction is outputted by the command output to the laser drive circuit 206. Laser light irradiation is started with the light intensity (S178), focus pull-in is performed in the same manner as the above-described operation (S112), focus servo is started (S180), and the operation of the data decoding circuit 112 is started (S182). As a result, the data decoding circuit 112 outputs the decoded BCA data, so this data is input (S184), the original BCA data (the BCA data output to the data conversion circuit 202) and the decoded BCA data. And the determination result of whether or not the BCA code is correctly recorded is displayed on the display device 402 (S186).

  Then, the focus servo is stopped, the laser beam irradiation is stopped, the rotation is stopped (S188), and the operation of the data decoding circuit 112 is stopped by command output to the focus servo circuit 104, the laser driving circuit 206, the spindle motor control circuit 210, and the data decoding circuit 112. (S190), and the program ends (S192). Thereafter, the operator removes the optical disk DK from the turntable 214, sets a new optical disk DK on the turntable 214, and inputs an initialization start command from the input device 404 again. By repeating this, initialization of the optical disk DK and recording of the BCA code at a predetermined radius position are performed one after another.

  As described above, according to the optical disc initialization apparatus 1 in the present embodiment, there is no radial movement in the inner peripheral side and outer peripheral side initialization tilt areas adjacent to the identification information recording area (BCA code recording area). Since the initialization is performed, the radial position in the circumferential direction at the inner peripheral side end and the outer peripheral side end of the BCA code can be made the same, and the radial position at the inner peripheral side end and the outer peripheral side end of the BCA code can be set. It can be within an acceptable range.

  Also, from the innermost side of the optical disk DK, initialization with radial feed, initialization without radial feed, recording identification information (BCA code), initialization without radial feed, initial with radial feed Since the processing is performed by a series of operations in the order of conversion, production efficiency can be maintained.

  Further, the radial position detection means (in this embodiment, counts the number of pulses of the pulse signal output from the encoder built in the feed motor 300 and is calculated by calculation using the count value) is an identification information recording area (BCA code recording area). ), The initialization by the initialization means is continued at the inner circumference end and the initialization by the initialization means is started at the outer circumference end to detect the specific rotational position. Since the radial movement by the radial movement means is stopped until the specific position is detected twice or more times, the radial movement can be easily performed at the inner end or the outer end of the identification information recording area (BCA code recording area). Initialization can be performed for one or more revolutions of the optical disk, and a new complicated circuit or mechanism is not required, so that the cost of the apparatus can be suppressed.

  The above embodiment can be variously modified. In the above embodiment, initialization with radial feed, initialization without radial feed, identification information (BCA code) recording, initialization without radial feed, radial direction from the innermost circumference side of the optical disc DK. Processing is performed in the order of initialization with feeding, but this may be reversed and initialization may be performed in the same order from the outermost periphery. If the production efficiency is not concerned, the order of the processing may be changed variously. Also by this, the effect of making the radial position in the circumferential direction the same at the inner peripheral side end and the outer peripheral side end of the BCA cord can be obtained without change.

  In the above embodiment, the index signal output from the encoder in the spindle motor 212 is used to detect the specific rotational position. However, the specific rotational position may be detected using other signals. . For example, the rotation angle is detected from the pulse signal output from the encoder in the spindle motor 212, and is set to 0 degree every time the rotation angle reaches 360 degrees, and the signal is output when the set rotation angle is reached. Thus, a specific rotational position may be detected.

  Further, in the above embodiment, the detection point of the radius value is set at a position where the boundary between initialization and non-initialization is formed near the inner peripheral end of the light spot SP. It may be a position where the boundary between initialization and non-initialization can be made near the edge, and the position where the boundary between initialization and non-initialization near the inner edge and the outer edge of the light spot SP can be detected correctly. If possible, any position may be used as the detection point of the radius value.

  Further, in the above embodiment, the laser beam irradiation position is moved in the radial direction of the turntable by driving the feed motor 300 connected to the turntable 214 and the spindle motor 212. However, the optical pickup 200 is moved. It may be. In the above embodiment, initialization, BCA code recording, BCA data reproduction, and focus servo are performed with the same laser beam. However, if cost is not important, two or more laser light sources are used for initialization. Further, at least one of BCA code recording, BCA data reproduction, and focus servo may use another laser beam, and various modifications can be made without departing from the object of the present invention.

  As described above, according to the present invention, the radial positions in the circumferential direction at the inner and outer ends of the BCA cord are easily made the same, and the radial positions at the inner and outer ends of the BCA cord are allowed. An optical disc initialization apparatus and an optical disc initialization method that can be within the range can be provided.

1 is a configuration diagram showing the overall configuration of an optical disc initialization apparatus to which the present invention is applied. It is a flowchart of the program which the controller of the optical disk initialization apparatus performs. It is a flowchart of the program which the controller of the optical disk initialization apparatus performs. It is a flowchart of the program which the controller of the optical disk initialization apparatus performs. It is explanatory drawing which showed the detection point of the radius value to detect with the light spot and the initialization and non-initialization location in an optical disk. It is explanatory drawing which showed how the BCA code was recorded in the boundary of the initialization inclination area | region and BCA code recording area | region in this invention. It is explanatory drawing which showed a mode that the BCA code which consists of an initialization area | region and a non-initialization area | region was recorded on the optical disk by the movement of a laser spot. It is explanatory drawing which showed that the radial position of the inner peripheral side end and outer peripheral side end of a BCA code | cord | chord did not correspond in the circumferential direction in the conventional optical disk initialization apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk initialization apparatus 100 ... Signal amplification circuit 102 ... Focus error signal generation circuit 104 ... Focus servo circuit 106 ... Drive circuit 108 ... Reproduction signal generation circuit 110 ... · Binarization circuit 112 ··· Data decoding circuit 200 ··· Optical pickup 202 ··· Data conversion circuit 204 ··· Recording signal generation circuit 206 ··· Laser drive circuit 208 ··· clock signal generation circuit 210 ... Spindle motor control circuit 212 ... Spindle motor 214 ... Turntable 300 ... Feed motor 302 ... Radius value detection circuit 304 ... Feed motor control circuit 400 ... Controller 402 ... Display device 404... Input device

Claims (4)

A turntable for mounting an optical disk, a rotating means for rotating the turntable, a laser light irradiation means for irradiating the optical disk mounted on the turntable with laser light, and a laser irradiated on the optical disk by the laser light irradiation means A radial direction moving means for moving a light irradiation position in a radial direction of the turntable; a radial position detecting means for detecting a radial position of the laser light irradiated on the optical disk by the laser light irradiation means; Rotating means rotates the optical disk and irradiates the optical disk with a laser beam of a predetermined intensity by the laser light irradiating means, and initializes the recording layer of the optical disk. By irradiating the optical disk with pulsed laser light by means of light irradiation means, the optical disk An identification information recording means for recording identification information consisting of an initialization location and a non-initialization location on a recording layer of a predetermined identification information recording area, and a radial movement by the radial movement means and the radial position detection means To detect the radial position, and based on the detected radial position and the previously stored initialization area in the radial direction and the identification information recording area, initialization by the initialization means and identification by the identification information recording means In an optical disc initialization apparatus provided with processing control means for continuously performing switching while recording information,
The processing control means
Initialization by the initialization means that is not accompanied by radial movement by the radial movement means in at least one rotation of rotation by the rotation means in the initialization area adjacent to the identification information recording area on the inner circumference side and outer circumference side. An optical disc initialization apparatus characterized by being performed across. The processing control means is
In the initialization area on the inner circumference side of the identification information recording area, perform initialization by the initialization means accompanied by radial movement by the radial movement means,
An initialization area adjacent to the identification information recording area is initialized by the initialization means without the radial movement by the radial movement means,
In the identification information recording area, recording the identification information by the identification information recording means accompanied by the radial movement by the radial movement means,
In the initialization area adjacent to the identification information recording area, initialization by the initialization means without radial movement by the radial movement means,
2. The optical disc initialization apparatus according to claim 1, wherein initialization is performed by the initialization means accompanied by radial movement by the radial movement means in an initialization area on the outer peripheral side of the identification information recording area. . A specific rotation position detection means for detecting a specific rotation position in the circumferential direction of rotation by the rotation means;
The processing control means is
When the radial position detection means detects the radial position of the inner peripheral side end or the outer peripheral side end of the identification information recording area,
The initialization by the initialization means is continued at the inner peripheral side end, and the initialization by the initialization means is started at the outer peripheral end,
3. The optical disc initialization apparatus according to claim 1, wherein the radial movement by the radial movement means is stopped until the specific rotation position detection means detects the specific position twice or more. The optical disk is rotated, the optical disk is irradiated with laser light, the laser light irradiation position on the optical disk is sent in the radial direction of the optical disk, the radius of the laser light irradiation position is detected, and the detected radial position is stored in advance. Based on the initialization area and the identification information recording area in the radial direction, the laser beam irradiation is performed with the laser beam having a predetermined intensity at which the recording layer of the optical disc is initialized or the recording layer of the optical disc is discontinuous. By performing pulsed laser beam irradiation to be initialized, the recording layer of the optical disc is initialized and the identification information is recorded on the recording layer by switching between identification points and non-initialization points. In the optical disc initialization method,
Initialization ramps on the inner and outer circumferences adjacent to the identification information recording area,
A method of initializing an optical disc, comprising irradiating at least one rotation of the optical disc with a laser beam of a predetermined intensity that initializes the recording layer of the optical disc without causing radial movement of the laser beam irradiation position.

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