JP2005332580A - Optical disk device and optical disk device standby method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device which can perform speedy and sure recording processing by causing an optical head to stand to at an optimal position after the end of recording (reproducing) processing. <P>SOLUTION: An optical disk device includes: an optical head for performing recording or reproducing processing by irradiating an optical disk having an information recording layer with a laser beam or by receiving a reflected wave; a standby position determining means for detecting the reflected wave from the optical disk using the optical head after the end of recording or reproducing processing, identifying a non-recorded area and a recorded area where recording processing is completed, based on the level or distribution of the reflectance of the detected reflected wave, and further determining a standby position at a position two or more tracks before from the border line of the non-recorded area to the side of the recorded area; and a control means for performing control so that the optical head is moved to and stand to at the standby position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disk apparatus that waits an optical head before an unrecorded area after completion of recording / reproducing processing of the optical disk, and a standby method of the optical disk apparatus.

  Recently, optical disc apparatuses such as DVDs (Digital Versatile Discs) have been developed and become widespread, and further added value is required for operational reliability and usability. As an example of this, in the optical disc apparatus described in Patent Document 1 (Japanese Patent Laid-Open No. 10-79126), when an optical disc having a plurality of information recording surfaces on one side is reproduced, whether the optical disc is OTP or PTP. When a pause command is received during playback, the program jumps to the inner or outer circumference and waits for one track.

  The optical disk device described in this publication performs processing limited to a reproduction optical disk, and can maintain a relatively stable servo state by one track jump.

However, in a recordable optical disc, the reflectivity of the recording layer differs between the recorded area and the unrecorded area. Therefore, maintaining the servo state at the boundary between the recorded area and the unrecorded area is an area where the servo signal level varies. It can be said that it is in an extremely unstable state because the servo is applied. Also, when recording is started from the boundary area, in order to properly generate necessary information such as an error correction code at the recording start address, it is possible to return to the previous track by two or more tracks at the longest, It is necessary to record after reproducing the information.
JP-A-10-79126.

  That is, the above-described conventional optical disk apparatus is dedicated for reproduction, and cannot solve the problems peculiar to the optical disk recording apparatus. This is because the reflectance varies depending on the characteristics of the optical disc between the unrecorded area and the recorded area in the information recording layer. There are two types of optical disc characteristics, such as the characteristic that the reflectivity increases by recording data (Low-to-High) and the characteristic that the reflectivity decreases by recording (High-to-Low), such as DVD-RAM. However, this change in reflectivity is generally 2 to 3 times or more, and various signals are affected by the change in reflectivity in the boundary area between the recording area and the unrecorded area. become.

  As a result, it becomes difficult to perform precise servoing at the boundary area between the recording area and the unrecorded area, and the apparatus is waiting at a position one track back from the reproduction end area, as is done in the conventional reproduction type optical disc. Then, there is a possibility that the track is positioned in both the unrecorded area and the recorded area in the standby track hold state. Therefore, particularly in the case of recording processing, there is a problem that the servo operation cannot be stably maintained while waiting for the next command.

  Further, in the case of a recordable optical disc, in order to record / reproduce information, it is required that a response time from when a record / reproduction request is generated to when recording / reproduction processing is started is high-speed, In the conventional apparatus, since the optical head is not waiting in the unrecorded area, there is a problem that the recording process cannot be performed immediately even if a recording command is received.

  Further, in the case of a recording process, it may be generated after reading an error correction code embedded in previously recorded data. In order to realize this operation smoothly, it is optimal to stand by at the position where the error correction code to be read is recorded, and the error correction code is not necessarily required only by returning one track as in the prior art. Cannot be read quickly.

  The present invention provides an optical disc apparatus and an optical disc that can perform recording (reproduction) processing with stable operation in accordance with the next command by waiting the optical head at an optimal position after completion of recording (reproduction) processing of the recordable optical disc. It is an object of the present invention to provide a device standby method.

  In order to solve the above-described problems, the present invention provides an optical head that performs recording processing or reproducing processing by irradiating an optical disc having an information recording layer with laser light or receiving reflected waves, and the recording processing or reproducing processing includes After the completion, the reflected wave from the optical disc is detected by the optical head, and based on the height of the reflectance or the distribution of the reflectance, it is identified as an unrecorded area and a recorded area after the recording process, , Standby position determination means for determining the standby position to a position two tracks or more before the recording area from the boundary line of the unrecorded area, and the optical head is moved to the standby position for standby. And an optical disc apparatus characterized by comprising control means for controlling as much as possible.

In the optical disc apparatus described above, it is possible to avoid instability in the vicinity of the boundary between the recording area and the unrecorded area by waiting at a position of two tracks or more, and further, response time and error during recording processing. Stable operation is possible by securing the correction code processing time. Further, in the power saving state, a predetermined amount of evacuation is performed to avoid the risk of servoing in an unrecorded area when the power saving state is canceled and the servo state is entered again.
That is, in the unrecorded area M and the recorded area R, the reflectance of the information recording layer is different, and the level of the servo signal is expected to be greatly different. As a result, there is a possibility that the servo state becomes unstable, and it is necessary to take measures to recover from the power saving state stably and at high speed. As a countermeasure, in addition to evacuation of two or more tracks, a predetermined amount of evacuation is performed to enter a power saving state, so that even if a system controller that has been in a standby state receives an information recording or reproduction request, it is instantaneously stable. It becomes possible to enter the servo state.

  By waiting at a position of two tracks or more, operation instability near the boundary between the recording area and the unrecorded area can be avoided, and further, response time during recording processing and error correction code processing time can be reduced. By ensuring, stable operation is possible.

  Hereinafter, an optical disk device and a standby method of the optical disk device according to the present invention will be described in detail with reference to the drawings.

<Optical Disc Device According to the Present Invention>
The configuration of the optical disc apparatus according to the first embodiment of the present invention will be described. FIG. 1 is a block diagram showing an example of an optical disc apparatus according to the first embodiment of the present invention, FIG. 2 is a block diagram showing an example of an optical disc according to the first embodiment of the present invention, and FIG. FIG. 4 is a configuration diagram showing the arrangement of the optical head and the like, and FIG. 4 is a configuration diagram of the optical head of the optical disc apparatus. Here, a single spiral groove structure 101 having two information recording layers on one side as shown in FIG. 2 and capable of continuously recording information tracks of each information recording layer from the inner periphery to the outer periphery is provided. An optical disc apparatus that performs recording processing on an optical disc will be described.

  An optical disc D to be processed by the optical disc apparatus according to the first embodiment of the present invention is a rewritable medium having a phase change recording layer as an information recording layer, as shown in FIG. This is a recording medium having a first recording layer 3 and a second recording layer 4 on which information is recorded / reproduced by a light beam condensed by an objective lens 5 included in the optical disc apparatus. The rotation of the optical disk D is controlled by a spindle motor 2 included in the optical disk apparatus. In particular, when information recording is performed, a ZCLV (Zoned Constant Linear Velocity) method or the like for keeping the rotational linear velocity constant is adopted.

  Further, the optical head 10 performs recording (mark formation) by irradiating a predetermined information recording layer of the optical disc with laser light having a predetermined wavelength. This recording is performed, for example, by a mark length recording method in which information is provided at the edge of the recording mark. Laser light emitted from a laser light source provided in the optical head 10 is collimated to become parallel light, and then enters the optical correction mechanism 8 through an optical element (not shown). In this optical correction mechanism 8, for example, the aberration is corrected by a relay lens or a liquid crystal element so that an optical spot formed on the information recording layer does not have spherical aberration. The light beam corrected by the optical aberration correcting mechanism 8 is further incident on the objective lens 5 through the rising mirror 7 to form an optical spot on a predetermined information recording surface of the optical disc D. On the other hand, a part of the light beam reflected by the information recording surface is incident on the photodetector 9 via the rising mirror 7 again. The photodetector 7 detects a position error with respect to the target position of the optical spot focused on the information recording surface by photoelectric conversion of the detection cells divided into a plurality of parts. As this position error, there are a focus position error for forming an optical spot focused on the information recording surface, a track position error, a tilt error, and a spherical aberration error.

  An information track for recording / reproducing information is formed on the information recording surface, and a positional deviation in the optical disc radial direction with respect to the target track is a track position error. The tilt error is a deviation angle between the optical axis of the light beam irradiated by the objective lens 5 and the normal line of the optical disc D. If this angle is large, coma aberration occurs in the optical spot, and the spot quality is lowered. Finally, the spherical aberration is an aberration that similarly deteriorates the spot quality of the optical spot, and is generated when the wavefront condensed by the objective lens 5 deviates from the spherical surface.

  In the optical disk apparatus, the above-described various position errors are detected by the positioning error detection circuit 19 using the photodetector 10 and the difference circuit 11 and the like, and the respective positioning errors are detected by the compensation controller 20 so that an appropriate optical spot is formed. Is calculated, and the control operation amounts are input to the optical correction mechanism control circuit 21, the focus mechanism control circuit 22, the fine positioning mechanism control circuit 23, the coarse positioning mechanism control circuit 17, and the tilt adjustment mechanism control circuit 24, respectively. To do. Each control circuit drives and controls the optical correction mechanism 8, the objective lens positioning mechanism 6, and the coarse positioning mechanism 12 so that the optical spot is appropriately formed at the target position based on the input control operation amount. Further, the output from the difference circuit 11 is given to the relative displacement calculator 13 and the speed detector 15, the outputs from the reference speed generator 14 and the speed detector 15 are calculated, and the coarse positioning is performed via the amplifier 16. The output is supplied to the mechanism control circuit 17, and this output drives and controls the coarse positioning mechanism 12.

  In addition to the configuration of the drive system of the optical head 10, the optical disc apparatus has a configuration of a recording processing system, a reproduction processing system, and a control system (not shown). That is, a data reproduction circuit that is a reproduction processing system circuit connected to the optical head 10, a laser control circuit that controls light emission of a semiconductor laser diode that is a recording processing circuit and is built in the optical head 10, and these It has a CPU that is the configuration of the control unit that controls the operation, a RAM and ROM that are storage areas, an interface circuit that performs data communication with an external device, and the like.

  Further, FIG. 3 shows an example of the apparatus configuration of the optical disk apparatus according to the first embodiment of the present invention, and FIG. 4 shows the detailed optical system configuration of the optical head 10 of the optical disk apparatus of the present invention. In these drawings, the laser light emitted from the laser light source 28 is optically adjusted by an optical correction mechanism using the relay lens 8. Further, a half prism 29 is used to travel the return light from the optical disk D to the error signal detection system.

<First Embodiment>
In the optical disk apparatus for an optical disk having one or more recording layers, the optical disk apparatus and the optical disk apparatus wait for the optical head at a position before the predetermined amount of the unrecorded area after the end of the recording or reproducing process. A standby method is provided. FIGS. 5 to 9 are diagrams showing examples of the standby position of the optical head of the optical disk apparatus, and FIGS. 10 and 11 are flowcharts for explaining the standby process of the optical head including the layer jump of the optical disk apparatus.

(Principle of optical head standby method of the present invention)
In the present invention, in the recording optical disk having the information recording layer, the recording area R and the non-recording area M have greatly different reflectances. Therefore, when the optical head is made to stand by near the boundary between the recording area R and the non-recording area M, Since the servo tends to become unstable, for example, it is possible to simultaneously perform rapid recording processing while ensuring operational stability by waiting for the optical head on the recording area R side at a distance of 2 tracks or more. It is.

  Specifically, in this low to high characteristic medium, the reflectance of the unrecorded area is 10% or less, while the reflectance of the recording area is 20% or more. In this case, when the servo that forms an optical spot near the boundary between the recording area and the unrecorded area is performed, the component of the reflected wave reflected with the low reflectance of the unrecorded area is reflected with the high reflectance of the recording area. The neutral position to be servoed is shifted to the unrecorded area side. When the neutral position is shifted to the unrecorded area side in this way, a so-called positive feedback state that is strongly influenced by the unrecorded area is caused by this shift, and the servo tends to become very unstable. In order to avoid the servo instability that is particularly noticeable in low-to-high media in this way, for example, the system waits at a distance of 2 tracks or more and mixes reflected wave components in the unrecorded area. Processing to avoid is performed. The detection method for obtaining the servo information includes a push-pull method and a DPD method, which will be described later. However, the description is omitted here because it is basically a general method.

  As shown in FIG. 6, the optical disk for recording has a recording area R that is already recorded and cannot be recorded, an unrecorded area M that is not recorded and can be recorded, and a recordable area K. A certain recording has been performed once, but it has been deleted and can be classified into at least a recordable area. In the standby method according to the present invention, if the unrecorded area M does not exist and the recordable area K exists, the optical head is made to wait before the recordable area K.

  However, there are a case where a plurality of unrecorded areas M exist as shown in FIG. 7 and a case where a plurality of recordable areas K exist as shown in FIGS. 8 and 9, and the standby position in that case is determined. The order of priority when doing this is shown below.

(Priority of standby position)
The priorities of the standby positions are shown below with reference to the drawings. The priorities are not limited and can be freely selected. However, a predetermined priority order is determined according to the use situation, and the standby position is determined by the standby position determination circuit 27 of FIG.

  FIG. 5 shows an example of a basic optical disk D for recording. A standby position is determined at a position, for example, two tracks before one unrecorded area M. In this example, a basic standby position is shown.

  FIG. 6 shows an example of a recording optical disk D having a plurality of recording layers. The standby position is, for example, two tracks before the unrecorded area M of the second recording layer 4 where the unrecorded area M exists. Has been determined. If there is no unrecorded area M in the recording layer 3 where recording has been completed and there is another layer, a layer jump is performed, and a position before the unrecorded area M is set as a standby position.

  FIG. 7 shows an example of a recording optical disk D having a plurality of recording layers. Each layer has an unrecorded area M. For example, an unrecorded area M of the first recording layer 3 on the optical head 10 side is shown in FIG. A standby position is determined at a position two tracks ahead. In principle, priority is given to the unrecorded area M of the layer on the optical head 10 side. However, a priority order in which the unrecorded area M on the opposite side of the optical head 10 is selected is also possible.

  FIG. 8 shows an example of a recording optical disk D having one recording layer, in which an unrecorded area M does not exist and a plurality of recordable areas K exist. Here, a standby position is determined at a position before the recordable area K on the right side having a large storage capacity. In principle, the recordable area K having the larger storage capacity is selected, but a priority order that is determined according to the position of the recordable area K is also possible.

  FIG. 9 shows an example of a recording optical disk D having a plurality of recording layers, where an unrecorded area M does not exist and a recordable area K exists in each layer. Here, the standby position is determined at a position before the recordable area K of the second recording layer 4 having a large storage capacity. As a general rule, the recordable area K having the larger storage capacity is selected. However, a priority order that is determined as the recordable area K of the layer on the optical head side according to the position of the recordable area K is also possible.

  As described above, as one priority, the unrecorded area M is given priority over the recordable area K. If there are a plurality of unrecorded areas M, the unrecorded area M of the layer on the optical head side is further closer to the recording start position. It is possible to set such that priority is given to the unrecorded area M, and if only a plurality of recordable areas K is given, the recordable area K having a large storage capacity is given priority.

(Processing flowchart)
Next, a specific example of the standby method according to the present invention performed according to the above-described priority order will be described in detail using a flowchart.

  As described above, an optical spot is formed at the target position and a series of information is recorded, but when the recording or reproducing operation is completed, a standby operation is started and a new series of information recording or reproducing command is issued. Wait until the system controller 25 is reached. This standby processing sequence will be described with reference to the flowcharts of FIGS.

  First, a first embodiment of a standby method after recording or reproducing information will be described with reference to FIG. When information is recorded or reproduced first, and the system controller 25 determines that the information recording or reproduction operation is completed (ST11), the recording information management unit 26 records the information recording layer that currently forms the optical spot. The capacities of the possible area K and the unrecorded area M are calculated (ST12). At the same time, the capacities of the recordable area and the unrecorded area of the information recording layer where no optical spot is currently formed are calculated (ST13).

(Method for identifying unrecorded area and recordable area)
Here, as a method for discriminating between the unrecorded area M and the recordable area K, the following patterns can be considered. Here, the patterns 2a and 2b capture the pattern 3 from a macro viewpoint.

Pattern 1
Unrecorded area: Area in which crystalline state or amorphous state is uniform Recording area: Area pattern 2a in which crystalline state and amorphous state are mixedly distributed
Unrecorded area: Area with low reflectivity (for example, 10% or less)
Recording area: Area with high reflectance (for example, 20% or less)
Pattern 2b
Unrecorded area: Area with high reflectivity Record area: Area pattern 3 with low reflectivity
Unrecorded area: Area where the reflectance is uniform Recording area: Area where the areas where the reflectances are different are mixedly distributed, and an area pattern whose average reflectance is higher or lower than the area where the reflectance is uniform 4
Unrecorded area: Area in which the dye is uniformly distributed and the reflectance is uniform Recording area: Area pattern 5 in which a part of the dye film is changed and the reflectance is different is mixedly distributed
Unrecorded area: Area where the reflecting surface of the optical spot is flat and uniform Recording area: Area having unevenness where the flat part is deformed The pattern as described above can be considered for discriminating between an unrecorded area and a recorded area. In accordance with the detection result of the optical head 10, the recording information management unit 26 compares the height of the reflectance and the degree of the distribution of the reflectance with a certain threshold value in particular, thereby comparing the unrecorded area M and the recording area K. And can be identified.

  Based on these results, the standby position determination circuit 27 determines whether or not it is possible to move to the unrecorded area M in accordance with the priorities (ST14). That is, it is determined whether there is an unrecorded area M that can be moved to each recording layer. If there is no unrecorded area M, it is determined whether a recordable area K exists. Here, if neither the unrecorded area M nor the recordable area K exists, the process waits at the current position (ST27).

  If there is an unrecorded area M or recordable area K that can be moved, the destination address is specified (ST15). It is determined whether or not the information recording layer that currently forms the optical spot is the first information recording layer 3 and the unrecorded area M exists in the first information recording layer 3 (ST16). If it is determined that there is a track, the track on the side of the recorded area, for example, two tracks or more from the boundary area between the unrecorded area M and the recorded area R corresponding to the address at which recording is completed, for example, two tracks or more. Jump aiming at. Hereinafter, this operation is referred to as a save operation. Here, if the unrecorded area M does not exist and only the recordable area K exists, the area before the recordable area is accessed (ST17).

  After confirming that the jump is completed and a predetermined address two tracks before the recording end track has been reached, the optical spot is held by that track by jumping one track for each rotation of the optical disc D, and enters a standby state. (ST18).

  The predetermined track at this time is preferably determined so that the track positioning error signal detected by the push-pull method or the DPP method is not affected by the boundary area between the recording area and the unrecorded area. The track is an appropriate value. The jump operation for holding to the track is started at an address position on the inner circumference of one track substantially corresponding to the recording end position as shown in FIG. By performing the evacuation operation for at least two tracks in this way, it is possible to avoid the adverse effect of the servo signal level change existing in the boundary area between the recording area R and the unrecorded area M, and realize a stable standby operation. It becomes possible.

  Also, when a request for recording without loss of area is given to the system controller 25 at the position where the above-described recording operation is completed, the information already recorded in the area before the recording start area is necessary for information recording. Can be reproduced smoothly, and a high-speed recording operation can be realized without generating an extra operation before the information recording operation is started.

  In this case, after the end of the operation of recording in the unrecorded area M, the recording end position becomes the boundary track, so the access operation of the step operation of step ST17 jumps to the track before the first predetermined number of tracks. Then, it is realized by returning (ST18).

  In step ST16, the information recording layer that currently forms the optical spot is the first information recording layer 3, the unrecorded area M does not exist in the first information recording layer, and the second When it is determined that the unrecorded area M exists in the information recording layer 4 (ST16), a layer jump is performed. That is, an access operation to a predetermined second information recording layer address determined by the standby position determination circuit 27 is performed as described below. First, the approximate address of the current information recording layer corresponding to the boundary area between the unrecorded area and the recording area of the second information recording layer is detected from the recorded information management section 26 (ST19). At this time, in order to avoid the influence of the eccentricity and the misalignment of the two information recording layers, the above approximate address is within about 0.1 mm from the address corresponding to the boundary area (corresponding to the point A in FIG. 6). It is given as a peripheral address (point B ′ in FIG. 6). Subsequently, an access operation (ST20) in the first information recording layer is performed for this address, and after reaching the target address, a layer jump is made to a predetermined address (point B) of the second information recording layer. Performed (ST21). Thereafter, focus pull-in operation, adjustment of various servo operations, and track pull-in operation are performed (ST22), and the address of the reached second information recording layer is read (ST23). Then, an access operation is performed from the track that is the boundary of the unrecorded area M of the second information recording layer 4 to a track that is a predetermined number of tracks before. Alternatively, an access operation is performed before the recordable area K (ST24). Next, track pull-in is performed (ST25), access is completed by the track hold operation, and a standby state is entered as shown in FIG. 6 (ST26).

  In the above-described layer jump operation, it is determined that the information recording layer that currently forms the optical spot is the second information recording layer 4, and the unrecorded area M exists in the first information recording layer 3. In the case (ST16), when the boundary area of the first information recording layer 3 is accessed, the same operation is performed and the standby state is entered at the position shown in FIG.

  On the other hand, as shown in FIG. 9, when it is determined that there is no unrecorded area M in the first information recording layer 3 or the second information recording layer 4 (ST14), the standby position determination circuit 27 Compare the recordable capacities of the two information recording layers, select the information recording layer that is determined to have a large capacity as the standby layer, and the boundary of the largest recordable area K of another layer or the current layer Access the area. In FIG. 9, the optical head is moved to the recordable area K of the second information recording layer 4.

  The optical head standby method according to the present invention is performed by the procedure as described above. When the recording process or the reproduction process is completed, the optical head waits before the unrecorded area M or the recordable area K. Thus, a reliable and stable recording process can be performed.

(When the optical disc starts)
The sequence of the standby method according to the first embodiment of the present invention can be performed as shown in FIG. 11 when the optical disk D is started, that is, after the optical disk D is inserted and the optical disk is recognized (ST10). It is. Here, in step ST27, when the optical head cannot be moved, standby at the initial position of the optical disk is performed. Further, as shown in FIGS. 5 and 8, even when the optical disc D has only the first information recording layer 3, it similarly stands by at the position shown in the drawing along the flowcharts of FIGS. be able to.

(Power saving mode)
In the power saving mode, when the standby state continues for a certain period of time and no request for recording or reproduction is received from the system controller 25, the optical spot further moves to the recording area side by a second predetermined number of tracks, Various servo states are set to hold or open loop, and a transition is made to a power saving state in which only the focus servo is applied. The second predetermined track is determined so that an optical spot is not formed in the boundary region due to the eccentricity of the optical disk even when the track positioning servo is in an open loop and the servo is not applied. When the amount of eccentricity is measured by a method such as learning, the second predetermined number of tracks is determined from this value. In addition, when the amount of eccentricity cannot be measured, for example, a value of about 0.1 mm is preferable.

  As described above, if the save operation for the second predetermined number of tracks is not performed, there is a possibility that when the power saving state is canceled and the servo state is entered again, the servo is performed in the unrecorded area. As described above, the reflectance of the information recording layer is different between the unrecorded area M and the recorded area R, and the level of the servo signal is expected to be greatly different. As a result, there is a possibility that the servo state becomes unstable, and it is necessary to take measures to recover from the power saving state stably and at high speed. As a countermeasure against this, by setting the second predetermined number of tracks as described above and entering the power saving state, even if an information recording or reproduction request is received from the system controller 25 in the standby state, an instantaneously stable servo It becomes possible to enter the state.

  Note that the first predetermined number of tracks, which is the avoidance from the first unrecorded area M, can be set to a slightly larger value so as to be the same as the second predetermined number of tracks from the beginning. is there.

(Other)
In the recordable area K, since there is no unrecorded area of information, the servo signal is not adversely affected by the boundary between the unrecorded area and the recorded area. However, when the recording operation is requested, it is smooth. In order to read information necessary for the next recording operation, such as an error correction code, the evacuation operation for returning from the track where the final recording has been completed is performed by the above-described evacuation operation for the first predetermined number of tracks. It is desirable. Further, in this case, assuming that the power saving state is assumed, the servo state can be stably recovered without performing further retreat operation for the second predetermined number of tracks. Is not necessary.

  When the remaining capacity falls below a predetermined value due to the remaining capacity of the recordable area, for example, 32 KB or less corresponding to one ECC block, the standby position determination circuit 27 determines that the recording operation cannot be performed, and prepares for the reproducing operation. Therefore, it may be possible to return to the first information recording layer.

  Note that the above-mentioned unrecorded area M does not include an area that is not recorded due to the influence of a defect or the like, and does not include an area less than a predetermined capacity. When virtual data is filled with a request to fill virtual data, the virtual data recorded area can be handled as an unrecorded area M or a recordable area K.

  Also, when entering the standby operation after the completion of the information reproduction operation, if this termination occurs due to a pause command or the like, the track hold operation is performed on the track at the end without accessing the boundary area described above. It can be performed.

  In addition, when entering the standby operation after the completion of the information reproduction operation, it waits at the current position in consideration of the possibility that the reproduction operation is resumed until a certain period elapses. It is also possible to newly set an operation mode in which the optical head is moved to the unrecorded area M or the recordable area K described above, assuming that the reproduction operation is not resumed. By providing such an operation mode, it becomes possible to improve the operability of the reproduction processing of the recorded optical disk.

  As described above, according to the standby method of the first embodiment according to the present invention, the optical head is allowed to wait in front of the unrecorded area M or the recordable area K, so that it is possible to wait with stable servo and recording processing. It is possible to provide an optical disc apparatus and a standby method for the optical disc apparatus that enable quick restart of the optical disc apparatus.

  Note that the standby method of the present invention is a standby method after continuous recording in an unrecorded area, and a standby after the recording operation is completed when an unrecorded area exists in both of the two information recording layers. It includes at least a method, a standby method after recording on an information recording layer where information has been recorded once, and a standby method after an information reproducing operation.

  In the above-described first embodiment, the case of having one or two information recording layers on one side has been described. However, even in the case of having three or more information recording layers, the standby method is defined with the same function and effect. be able to.

  Even when a temporary stop command is forcibly given to the system controller during recording or reproduction of information, the operation after the temporary stop command is canceled can be performed by performing the save operation in the above standby method. It becomes possible to perform it stably and at high speed.

Second Embodiment
In the optical disk device specified in the first embodiment, the second embodiment is a track structure in which the optical disk is waiting for an unrecorded area or a recordable area when the track structure is recorded from the inner periphery to the outer periphery. In the case of a track structure in which recording is performed from the inner circumference side of the unrecorded area or the recordable area, from the outer circumference to the inner circumference, the optical disc apparatus set on the outer circumference side of the unrecorded area or the recordable area and the standby of the optical disc apparatus A method is provided. FIG. 12 is a diagram showing an example of the standby position of the optical head of the optical disc apparatus according to the second embodiment of the present invention.

  Here, the optical disc D shown in FIG. 12 has two information recording layers on one side, the track structure is a groove structure, and the first information recording layer 3 is a track that records from the inner periphery to the outer periphery. The structure of the second information recording layer 4 is intended for an optical disc having a track structure for recording information from the outer periphery to the inner periphery.

  In the optical disk apparatus that records and reproduces data on the optical disk having such a disk structure, the structure of the optical disk apparatus is the same as that in the first embodiment, and thus the description thereof is omitted. Also, the standby method in this optical disc apparatus is the same as the sequence of the standby method of the first embodiment shown in FIGS.

  The difference from the first embodiment is that the track structure of the second information recording layer 4 is a structure that can be recorded from the outer periphery to the inner periphery. The track jump method is a point of jumping from the predetermined jump start position to the outer peripheral direction and waiting at the position in the outer peripheral direction. At this time, in order to avoid the influence of the eccentricity and the axis misalignment of the two information recording layers, the above approximate address is about 0. 0 with respect to the address corresponding to the boundary area (point A in FIG. 12). An address on the outer peripheral side (point B ′ in FIG. 12) of about 1 mm is given, and an access operation as shown in step ST20 is performed in the first information recording layer 3 with respect to this address.

  After reaching the target address, as in the first embodiment, a layer jump is performed to a predetermined address (point B in FIG. 12) of the second information recording layer 4 as shown in step ST21. As shown in FIG. 12, in the second embodiment, when there is an unrecorded area M in the second information recording layer 4, the optical spot is in the outer peripheral direction of the unrecorded area M according to the determination procedure shown in FIG. For example, it stands by at a position separated by two tracks or more than two tracks.

  As described above, in the second embodiment, it is specified that the track jumping direction and the optical head standby position are determined in correspondence with the recording direction on the optical disc D.

<Third Embodiment>
In the optical disk apparatus specified in the first embodiment, the third embodiment has a track structure in which a priority area as a standby position when a plurality of unrecorded areas exist is a track structure having recording areas in grooves and lands. The optical disk apparatus specified in the above and a standby method of the optical disk apparatus are provided. FIG. 13 is a diagram showing an example of the standby position of the optical head of the optical disc apparatus according to the third embodiment of the present invention, and FIGS. 14 and 15 are flowcharts for explaining an example of the standby method of the third embodiment. FIG. 16 is a block diagram showing an example of an optical disc apparatus according to the third embodiment.

  The target optical disk D in the third embodiment is as shown in FIG. 12, and has a track structure having recording areas in grooves and lands. Further, the optical disk device according to the third embodiment has a structure substantially equivalent to that of the optical disk device according to the first embodiment of FIG. 1 as shown in FIG. 16, but the polarity switching circuit 28 for switching between the groove and the land. Is different from the optical disc apparatus of the first embodiment in that the control signal is supplied to the compensation controller 20 and the positioning error detection circuit 19 to switch the polarity under the control of the system controller 25.

  In the optical disc according to the third embodiment, as shown in FIG. 13, generally, the groove portion 102 is generally recorded first, and then the land portion 103 is often recorded. In this case, the sequence of the standby method is as shown in the flowcharts of FIGS.

  Hereinafter, the standby method of the third embodiment will be described in detail with reference to the flowcharts of FIGS. 14 and 15. In this case, the groove portion and the land portion in the track structure of the optical disc can be considered as two different information recording areas. In view of this, in the sequence of FIGS. 14 and 15, when the information recording or reproducing is performed and the system controller 25 determines that the information recording or reproducing operation is completed (ST31), the recording information managing unit 26 The capacities of the recordable area K and the unrecorded area M of the information recording layer that currently forms the optical spot are calculated for each of the land portion and the groove portion (ST32). At the same time, the capacities of the recordable area K and the unrecorded area M of the information recording layer where no optical spot is currently formed are also calculated for the land portion and the groove portion (ST33).

  In accordance with the detection result, the standby position determination circuit 27 determines whether or not movement to the unrecorded area M or the recordable area K is possible (ST34), and if there is a target that can be moved, the destination address is specified. (ST35). Here, when there are a plurality of unrecorded areas M, the above-mentioned priority can be used, but when there are unrecorded areas M in the land part and the groove part, as an example, The selection method of giving priority to the land portion is possible, but the reverse priority order can also be used.

  Further, if there is no unrecorded area M or recordable area K as the movement destination, the optical head is waited at the current position of the optical head and at the initial position when the optical disk is activated (ST53).

  In the standby position determination circuit 27, it is determined whether or not the information recording layer that currently forms the optical spot is the first information recording layer 3 and a transfer destination exists in the first information recording layer (ST36). ). If it is determined that it is the current layer, it is determined whether it is a groove portion or a land portion (ST37). Here, if it is determined that there is an unrecorded area in the groove part, the recording area side is the first predetermined track from the boundary area between the recording area R and the unrecorded area M of the groove part to be preferentially recorded. Jump to aim for the track. In this jump operation, an unrecorded area may exist in the land portion. Therefore, when the target track on which the optical spot is currently formed is a land track (ST38), the inner circumferential side is positioned so as to be positioned on the groove track. The polarity switching circuit 28 jumps to the next groove track to switch the track positioning polarity (ST39). After that, the jump operation is started from the boundary track of the waiting area, for example, before the second track or the second track or more. Alternatively, access is made before the recordable area K (ST40). Thereafter, the access is completed and a standby state is entered (ST41). If the current groove is not a groove in step ST42, the jump operation is started, for example, before the second track or more than the second track from the boundary track of the standby area without switching the polarity. Alternatively, access is made to the front of the recordable area K (ST43).

  On the other hand, in step ST42, when the unrecorded area M does not exist in the groove part and the unrecorded area exists only in the land part, the first predetermined area is determined from the boundary area between the recorded area R and the unrecorded area M in the land part. A jump operation is performed aiming at a track on the recorded area side by the number of tracks (ST43), and a standby state is entered (ST44). In this jump operation, since there is no unrecorded area M in the groove portion, it is not necessary to switch the polarity for track positioning before the jump operation. However, if the track is positioned on the groove track at the start of jump, the polarity is switched to the land track on the recorded area side after reaching the groove track before the first predetermined track when converted to the groove track (ST45). Jumping is performed by the circuit 28 (ST46), and positioning to the land track is realized (ST47).

  After confirming that the jump operation is completed and a predetermined address before the first predetermined track is reached from the recording end track, the optical spot is held in that track by jumping one track for each rotation of the optical disk and waiting. It becomes a state. The predetermined track at this time is desirably determined so that the track positioning error signal detected by the push-pull method or the DPP method is not affected by the boundary region between the recording region R and the unrecorded region M. Two tracks are appropriate values. Further, the jump operation for holding to the track is started at the address position on the inner circumference of one track substantially corresponding to the recording end position as shown in FIG.

  By performing the evacuation operation for at least two tracks in this way, it is possible to avoid the adverse effect of changes in the servo signal level existing in the boundary area between the recording area and the unrecorded area, and to realize a stable standby operation. It becomes possible. Also, when a request for recording without loss of area is given to the system controller 25 at the position where the above-described recording operation is completed, the information already recorded in the area before the recording start area is necessary for information recording. Can be reproduced smoothly, and a high-speed recording operation can be realized without generating an extra operation before the information recording operation is started.

  On the other hand, when it is determined in step ST36 that the standby position determination circuit 27 selects the information recording layer to be standby, it is determined to move to a layer different from the current information recording layer, as in the case of the first embodiment. In addition, the layer jump specified in steps ST48 to ST52 is performed, and the track is positioned to the track that can be withdrawn for the time being to obtain the address (ST52). Thereafter, the optical head can be put into a standby state by the same procedure as that of steps ST37 to ST47.

  Here, the information recording layer of the optical disc D may be divided into predetermined zones. In this case, after recording on either the groove portion or the land portion in the divided zone is completed, the other one is recorded. Recording to will be started. The concept of the information recording layer described above may be applied to each zone. In the third embodiment, it is described that the recording is performed from the groove portion. However, the recording may be performed from the land portion.

  As described above, in the third embodiment, even when the recording area of the optical disc is divided into the land portion and the groove portion, the optical head is moved to the unrecorded region M or the recordable region K as in the first embodiment. By doing so, it is possible to provide an optical disc apparatus and a standby method for the optical disc apparatus that can use the remaining unrecorded area M for recording and perform quick and reliable recording processing.

  With the various embodiments described above, those skilled in the art can realize the present invention. However, it is easy for those skilled in the art to come up with various modifications of these embodiments, and have the inventive ability. It is possible to apply to various embodiments at least. Therefore, the present invention covers a wide range consistent with the disclosed principle and novel features, and is not limited to the above-described embodiments.

  As described above in detail, according to the present invention, a stable servo operation can be realized without being affected by the boundary area between the unrecorded area and the recorded area, and the remaining unrecorded area M can be used for recording. In addition, when a recording request is given, it is possible to reproduce information necessary for the next recording by using the already recorded information by performing track tracing as it is, so that a quick recording operation can be started. An optical disc device and a standby method for the optical disc device can be provided.

1 is a block diagram showing an example of an optical disc device according to a first embodiment of the present invention. 1 is a block diagram showing an example of an optical disc according to a first embodiment of the present invention. 1 is a configuration diagram showing the arrangement of optical heads and the like of an optical disc apparatus according to a first embodiment of the present invention. 1 is a configuration diagram of an optical head of an optical disc apparatus according to a first embodiment of the present invention. FIG. 6 is a diagram showing another example of the standby position of the optical head of the optical disc apparatus according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a standby position of the optical head of the optical disc apparatus according to the first embodiment of the invention. FIG. 6 is a diagram showing another example of the standby position of the optical head of the optical disc apparatus according to the first embodiment of the present invention. FIG. 6 is a diagram showing another example of the standby position of the optical head of the optical disc apparatus according to the first embodiment of the present invention. FIG. 6 is a diagram showing another example of the standby position of the optical head of the optical disc apparatus according to the first embodiment of the present invention. The flowchart for demonstrating an example of the standby method of 1st Embodiment which concerns on this invention. 6 is a flowchart for explaining standby processing of the optical head including a layer jump in the optical disc apparatus according to the first embodiment of the present invention. The figure which shows an example of the stand-by position of the optical head of the optical disk apparatus which is 2nd Embodiment concerning this invention. The figure which shows an example of the stand-by position of the optical head of the optical disk apparatus which is 3rd Embodiment concerning this invention. The flowchart for demonstrating an example of the standby method of 3rd Embodiment which concerns on this invention. The flowchart for demonstrating an example of the standby method of 3rd Embodiment which concerns on this invention. The block diagram which shows an example of the optical disk apparatus which concerns on 3rd Embodiment of this invention.

Explanation of symbols

D ... Optical disk, 2 ... Spindle motor, 3 ... First recording layer, 4 ... Second recording layer, 5 ... Objective lens, 6 ... Objective lens positioning mechanism, 7 ... Rising mirror, 8 ... Optical aberration correction mechanism, DESCRIPTION OF SYMBOLS 9 ... Photodetector, 10 ... Photodetection part, 11 ... Difference circuit, 12 ... Coarse positioning mechanism, 13 ... Relative displacement calculator, 14 ... Reference speed generation circuit, 15 ... Speed detector, 16 ... Amplifier, 17 ... Coarse Positioning mechanism control circuit, 18 ... Access control circuit, 19 ... Error detection circuit, 20 ... Compensation controller, 21 ... Optical correction mechanism control circuit, 22 ... Focus mechanism control circuit, 23 ... Precision positioning mechanism control circuit, 24 ... Tilt adjustment Mechanism control circuit, 25... System controller, 26... Recording information management unit, 27.

Claims (2)

An optical head for performing a recording process or a reproducing process by irradiating an optical disk having an information recording layer with a laser beam or receiving a reflected wave;
After the recording process or the reproduction process is completed, the reflected wave from the optical disc is detected by the optical head, and the recording process is completed for the unrecorded area and the recording process based on the height of the reflectance or the distribution of the reflectance. A standby position determination means for determining the standby position at a position two tracks or more before the track from the boundary line of the unrecorded area to the recording area side;
Control means for controlling to move the optical head to the standby position and wait;
An optical disc apparatus comprising: In a standby method of an optical disc apparatus having an optical head for performing recording processing or reproducing processing by irradiating an optical disc having an information recording layer with laser light or receiving a reflected wave,
After the recording process or the reproduction process is completed, the reflected wave from the optical disc is detected by the optical head, and the recording process is completed for the unrecorded area and the recording process based on the height of the reflectance or the distribution of the reflectance. And the standby position is determined at a position two tracks or two or more tracks before the recording area side from the boundary line of the unrecorded area,
A method of waiting for an optical disk apparatus, comprising: controlling the optical head to move to the standby position and wait.

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