WO2011128985A1 - 情報記録媒体、情報記録装置及び方法、並びに情報再生装置及び方法 - Google Patents
情報記録媒体、情報記録装置及び方法、並びに情報再生装置及び方法 Download PDFInfo
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- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
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- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
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- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/095—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble
- G11B7/0956—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following specially adapted for discs, e.g. for compensation of eccentricity or wobble to compensate for tilt, skew, warp or inclination of the disc, i.e. maintain the optical axis at right angles to the disc
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Definitions
- the present invention relates to an information recording medium such as a multilayer type or multilayer recording type optical disc, a recording apparatus and method for recording information on the information recording medium, and an information reproducing apparatus and method for reproducing information from the information recording medium.
- an information recording medium such as a multilayer type or multilayer recording type optical disc
- a recording apparatus and method for recording information on the information recording medium and an information reproducing apparatus and method for reproducing information from the information recording medium.
- a first light beam for tracking (for example, a guide light beam or a servo light beam made of a red laser as in the case of DVD) is irradiated and condensed on the guide layer through the recording layer. Is done. Thereby, tracking for each recording layer becomes possible. That is, the focus servo for the guide layer and the tracking servo using the track previously formed on the guide layer can be performed.
- a second beam for information recording / reproduction having a fixed or known positional relationship with the first beam such as using the same optical pickup or via the same objective lens ( For example, a main light beam composed of a blue laser as in the case of Blu-ray) is typically irradiated in a form concentrically superimposed on the first beam, and focused on one recording layer to be recorded or reproduced.
- a main light beam composed of a blue laser as in the case of Blu-ray is typically irradiated in a form concentrically superimposed on the first beam, and focused on one recording layer to be recorded or reproduced.
- recording and reproduction of this type of information recording medium can be performed on the optical pickup by a so-called “tilt correction” by a correction mechanism that corrects the disc tilt or simply tilt (typically, the tilt of the optical disc surface). It is executed while being applied. More generally, in addition to tilt correction, various processes such as disc eccentricity correction, disc surface tilt correction, optical system aberration correction, light beam phase difference correction and distortion correction, light absorption correction, and strategy setting, etc. Recording and reproduction are executed while the above is performed.
- the track pitch is reduced with respect to the diameter of the first light beam. It is difficult to perform tracking pull-in operation that is accurate enough to withstand practical use or track jump operation to a desired track at a desired timing. Alternatively, even if control information (such as servo marks and address information) is written on such a track, the track pitch and recording linear density (linear recording density, pit pitch or information) that can be recorded or reproduced in the recording layer. In practice, it is difficult to increase the transfer rate to such an extent that it can be said to be “high density recording”, which is the original purpose of the multilayer information recording medium.
- the angular velocity increases for each zone having a different radial position, so the arrangement relationship of control information recorded on the track of the guide layer, or the tilt error
- the arrangement relationship of the detection patterns is arbitrary according to the radial position.
- the present invention has been made in view of the above-described problems, for example, and a multilayer information recording medium capable of performing high-accuracy tracking servo and track jump while increasing information recording density, and such information recording medium. It is an object of the present invention to provide a recording apparatus and method for recording information on an information recording apparatus, and an information reproducing apparatus and method for reproducing information from such an information recording medium.
- the information recording medium of the present invention includes a guide layer in which concentric or spiral tracks are formed in advance, and a plurality of recording layers laminated on the guide layer.
- a plurality of guide regions each having a physical structure carrying guide information for guides, discretely at an arrangement interval equal to or less than a predetermined distance set in advance in the track direction along the track, and
- a plurality of specific areas each having a predetermined pattern are open in the tracking servo, and are shifted and arranged between the plurality of tracks adjacent to each other in the radial direction intersecting the tracks. In order to detect the predetermined pattern in the state, they are arranged in the same phase from the inner circumference to the outer circumference in the radial direction.
- a first information recording apparatus of the present invention is an information recording apparatus for recording data on the above-described information recording medium of the present invention, wherein the first light beam for tracking is recorded on the guide layer.
- a light irradiating means capable of irradiating and condensing a second light beam for data recording on one of the plurality of recording layers, and The first light based on the irradiated and condensed first light beam from the guide layer is received, the predetermined pattern is detected based on the received first light, and the carried guide information is acquired. And starting the pulling-in operation of the tracking servo based on one type of the predetermined pattern detected in the plurality of specific areas in a state where the tracking servo is in the open state.
- the first pull-in control means for controlling the continuation, and the tracking servo is in the open state or in the middle of the pull-in, the continuation of the pull-in operation based on another type of the predetermined pattern detected in the plurality of specific regions
- the light irradiating means is controlled to record the data by irradiating and condensing the second light beam to the one recording layer in the servo closed state where the tracking servo is applied.
- Data recording control means is controlled to record the data by irradiating and condensing the second light beam to the one recording layer in the servo closed state where the tracking servo is applied.
- a second information recording apparatus of the present invention is an information recording apparatus for recording data on the above-described information recording medium of the present invention, wherein the first light beam for tracking is recorded on the guide layer.
- a light irradiating means capable of irradiating and condensing a second light beam for data recording on one of the plurality of recording layers, and The first light based on the irradiated and condensed first light beam from the guide layer is received, the predetermined pattern is detected based on the received first light, and the carried guide information is acquired. And a track related to the track based on one type of the predetermined pattern detected in the plurality of specific regions in a closed state where the tracking servo is applied.
- Jump control means for controlling a jump, and when the track jump is performed, a desired position in the plurality of tracks is searched based on the acquired guide information, and the one recording layer is in the servo closed state.
- data recording control means for controlling the light irradiation means so as to record the data by irradiating and condensing the second light beam.
- the first information recording method of the present invention can irradiate and focus the first light beam for tracking on the above-mentioned information recording medium of the present invention.
- Receiving the first light based on the irradiated and condensed first light beam from the guide layer detecting the predetermined pattern based on the received first light, and supporting the carried guide information
- the tracking servo pull-in operation based on one type of the predetermined pattern detected in the plurality of specific areas when the tracking servo is in the open state.
- the first pull-in control step for controlling start or continuation, and the tracking servo is in the open state or in the middle of pull-in, based on another type of the predetermined pattern detected in the plurality of specific regions,
- the light irradiation means is controlled to record the data by irradiating and condensing the second light beam to the one recording layer.
- the second information recording method of the present invention can irradiate and collect the first light beam for tracking on the above-mentioned information recording medium of the present invention. And an information recording method for recording data using a light irradiation means capable of irradiating and condensing a second light beam for data recording to one of the plurality of recording layers.
- a first information reproducing apparatus of the present invention is an information reproducing apparatus for reproducing data from the above-described information recording medium of the present invention, wherein the first light beam for tracking is applied to the guide layer.
- a light irradiating means capable of irradiating and condensing a second light beam for data recording on one of the plurality of recording layers, and The first light based on the irradiated and condensed first light beam from the guide layer is received, the predetermined pattern is detected based on the received first light, and the carried guide information is acquired.
- Information acquisition means for performing the tracking servo pull-in operation based on one type of the predetermined pattern detected in the plurality of specific regions in a state where the tracking servo is in the open state
- the first pull-in control means for controlling the continuation, and the tracking servo is in the open state or in the middle of the pull-in, the continuation of the pull-in operation based on another type of the predetermined pattern detected in the plurality of specific regions
- second pull-in control means for controlling stop, and tracking servo means for controlling the light irradiation means so as to apply the tracking servo to a desired track among the plurality of tracks based on the acquired guide information
- the second light based on the irradiated and condensed second light beam from the one recording layer is received in the servo closed state where the tracking servo is applied, and the received second light is received.
- data acquisition means for acquiring the data based on the above.
- a second information reproducing apparatus of the present invention is an information reproducing apparatus for reproducing data from the above-described information recording medium of the present invention, wherein the first light beam for tracking is applied to the guide layer.
- a light irradiating means capable of irradiating and condensing a second light beam for data recording on one of the plurality of recording layers, and The first light based on the irradiated and condensed first light beam from the guide layer is received, the predetermined pattern is detected based on the received first light, and the carried guide information is acquired.
- Information acquisition means for performing tracking on the track based on one type of the predetermined pattern detected in the plurality of specific areas in a closed state where the tracking servo is applied.
- Jump control means for controlling jump, and when the track jump is performed, a desired position in the plurality of tracks is searched based on the acquired guide information, and the one recording layer is in the servo closed state.
- Data acquisition means for receiving the second light based on the irradiated and condensed second light beam from and receiving the data based on the received second light.
- the first information reproducing method of the present invention can irradiate and collect the first light beam for tracking on the guide layer from the above-described information recording medium of the present invention. And an information reproducing method for reproducing data using a light irradiating means capable of irradiating and condensing a second light beam for data recording to one of the plurality of recording layers.
- the second information reproducing method of the present invention can irradiate and collect the first light beam for tracking on the guide layer from the information recording medium of the present invention described above. And an information reproducing method for reproducing data using a light irradiating means capable of irradiating and condensing a second light beam for data recording to one of the plurality of recording layers.
- FIG. 3 is a schematic partial enlarged cross-sectional view showing an objective lens for focusing a first beam for guide and a second beam for recording (or reproduction) and an information recording medium in an example. It is a partially expanded perspective view of the guide layer in an Example. It is a partially expanded perspective view of the same meaning as FIG. 3 in the comparative example of an Example.
- FIG. 3 is a partially enlarged perspective view having the same concept as in FIG. 2 when an example of prepits is provided in the embodiment.
- FIG. 3 is a partially enlarged perspective view having the same concept as in FIG. 2 in the case where another example of the prepit in the embodiment is included.
- FIG. 3 is a conceptual diagram illustrating a configuration of a track in which four regions are provided in a guide layer and a schematic structure in each of the four regions in an example.
- FIG. 10 is a schematic partial enlarged plan view of a guide layer showing an example of a detailed structure of a specific region, which is one of the four regions shown in FIG. 9.
- it is the typical whole top view of a guide layer which shows the arrangement
- a tracking error signal particularly “zero cross signal”
- FIG. 31 is a block diagram illustrating a configuration of a tilt detection system included in the information recording / reproducing apparatus in FIG. 30.
- Fig. 31 is a timing chart of various signals used in the tilt detection system of Fig. 30.
- 5 is a flowchart of an information recording / reproducing method in the embodiment.
- FIG. 6 is a flowchart of a recording method for a new disk in the embodiment.
- 5 is a flowchart illustrating an example of a playback method for a new disc in the embodiment. It is a flowchart which shows an example of the drawing-in operation
- FIG. 39 is a characteristic diagram showing an operation of sampling a tracking error of a sampler included in the circuit portion of FIG. 38.
- the information recording medium of the present embodiment includes a guide layer in which concentric or spiral tracks are formed in advance, and a plurality of recording layers stacked on the guide layer.
- a plurality of guide regions each having a physical structure carrying guide information for guides, discretely at an arrangement interval equal to or less than a predetermined distance set in advance in the track direction along the track, and
- the tracking servo is opened in a plurality of specific areas each having a predetermined pattern and being shifted and arranged between the plurality of tracks across a plurality of radially adjacent tracks intersecting the track.
- the predetermined patterns are arranged in the same phase from the inner periphery to the outer periphery so that the predetermined pattern can be detected.
- concentric or spiral tracks provided in the guide layer are used for guiding or tracking, and are laminated on or below the guide layer.
- information can be optically recorded on a desired recording layer of the plurality of recording layers along the track by, for example, a zone CAV (Constant-Angular-Velocity) method or the like. Further, it is possible to optically reproduce information from a desired recording layer that has been recorded, for example, by using the zone CAV method, with or without using the track for guiding.
- zone CAV Constant-Angular-Velocity
- the “guide layer” is typically a position in the recording surface related to each recording layer (ie, a radial position along the recording surface) at least when recording or writing information to each recording layer. And a position in the track direction) means a layer for guiding or guiding a first light beam for guiding or tracking (hereinafter simply referred to as “first light beam”).
- the “guide layer” is typically a layer in which a track configured to generate a tracking error signal (or a wobble signal or a prepit signal as a source thereof) is physically created in advance.
- the “track” formed in the guide layer means a trajectory in which the first light beam is traced or followed at least during information recording, and typically, for example, wobbled, or in addition to or Instead, it is physically built in advance in the guide layer or on the guide layer as a groove track or land track in which pits are formed.
- the information track formed after recording in the recording layer is constructed in advance here in that it is constructed as an array or arrangement of recorded information pits on the recording surface where no track was originally present. It is clearly distinguished from the “track”.
- Information recording is typically performed at each position on the information track after recording in a desired recording layer corresponding to each position of the first light beam on the track in the guide layer guided in this manner.
- Information recording is performed using a second light beam for writing or information writing (hereinafter simply referred to as “second light beam”).
- a plurality of guide layers for example, two layers may be provided, and each may be appropriately used or assigned a role. Absent. In any case, the guide layer and the plurality of recording layers are provided as separate layers.
- the plurality of recording layers can be configured to record information independently of each other and to be reproducible.
- Each of the plurality of recording layers preferably has a structure as simple as possible, for example, a straight groove, a straight land, or a mirror surface in an unrecorded state. This is because it is preferable in manufacturing that alignment between a plurality of recording layers and alignment with the guide layer are hardly or practically unnecessary.
- the structure of the recording layer is such that the transmittance and reflectance of each recording layer are within a predetermined range so that the light beam reaches the recording layer or guide layer on the back side as viewed from the light beam irradiation side. It is configured to be able to record with various recording methods set to fit.
- a first light beam for example, a red laser that forms a light spot having a relatively large diameter
- a tracking error signal (or a wobble signal as a source thereof and a pre-pit signal in addition thereto) can be detected.
- tracking or tracking servo can be executed as a kind of guide operation. With this tracking being performed or the tracking servo being closed, a second light beam (for example, a blue laser that forms a relatively small-diameter light spot on the desired recording layer on the upper layer or lower layer side of the track) ) Is collected, information is recorded.
- a second light beam for example, a blue laser that forms a relatively small-diameter light spot on the desired recording layer on the upper layer or lower layer side of the track
- the track when reproducing information, the track may be used for guiding as well, or when reproducing this information, the guide layer is changed by following the information already written on the recording layer.
- Reproduction can also be performed by performing a tracking operation on the recorded information track without using it for the guide (typically for tracking).
- the “guide information” is information for guiding or guiding or following the first light beam.
- the “guide information” is optically a tracking error signal (or a wobble signal that is a source thereof and an addition thereto). Information for generating a pre-pit signal).
- the guide information can be rephrased as “mark information” in the sense that it becomes a mark for positioning the tracking light beam.
- the physical structure carrying such guide information is typically wobble and prepit structures (ie, land prepits, groove prepits, etc.), wobbles, This is realized by an arrangement or a series of prepits on a partially cut-out structure, a surface (for example, a mirror surface) without a groove and a land.
- the “physical structure” means a physically existing structure, unlike a logical structure or a conceptual or virtual structure constructed by simple data. The physical structure is already built on the guide when the information recording medium is completed.
- the guide information arrangement interval that is, the arrangement pitch
- the minimum distance necessary for enabling the guide operation for example, the tracking servo has a predetermined bandwidth
- the plurality of guide regions have a predetermined distance or less than a predetermined distance in the track direction along the spiral or concentric track (in other words, the tangential direction of the track). These are arranged discretely as arrangement intervals (that is, arrangement pitch).
- the “predetermined distance” is typically the longest distance at which the guide or the guide operation can function, which is a tracking or tracking operation in a predetermined band (for example, the tracking operation is stably executed in the predetermined band). This is a short distance with a slight margin (the longest distance at which the tracking signal can be generated continuously or continuously with a frequency of making it possible).
- the “predetermined band” means a band specific to a data format or data standard in which a tracking operation is performed, which is determined in relation to a band used at the time of information recording.
- a guide operation (typically, a tracking operation in a predetermined band) functions on a guide layer in a specific information recording medium in advance by experiment, experience, simulation, or the like. It may be set by obtaining the limit distance and determining an appropriate margin. If the guide areas are discretely arranged at an arrangement interval (that is, arrangement pitch) longer than a predetermined distance, tracking is performed at a frequency that enables stable tracking servo in a predetermined band, for example. A stable guide operation cannot be executed, for example, an error signal cannot be generated.
- “discretely” refers to other planes such as a mirror surface, a buffer region, and a region other than the guide region between the recording layers of each recording layer as viewed in plan on the recording surface. It means that the region is interposed.
- the plurality of guide regions are arranged so as to be shifted between the plurality of tracks in the radial direction (that is, the radial direction) intersecting the tracks over the plurality of adjacent tracks.
- “across a plurality of tracks” includes two or more tracks adjacent to each other in a plan view on the recording surface of each recording layer and a region that occupies a gap between them. , Meaning across or across them.
- shifted in a radial direction between a plurality of tracks means that a plurality of tracks in the radial direction (that is, the radial direction) have the same phase (for example, an angle on the disk) or a position corresponding to the same phase (for example, , Or an angular position on the disk) or not on the same radius.
- the plurality of guide regions that are arranged relatively close to each other in the radial direction do not need to be completely separated (that is, with a gap between them).
- the information is recorded or reproduced. It is sufficient that the phase in the radial direction is shifted to such an extent that the tracking servo light beam in (1) does not simultaneously reach the plurality of guide regions (for example, over five tracks). Alternatively, it is sufficient that signals and information that can be read from the plurality of guide regions are shifted to some extent by the light beam so that they can be distinguished from each other.
- the guide region corresponds to the above.
- the guide information is shifted as described above, the guide information is overlapped in both the track direction and the radial direction (or the signal information from other guide regions affects as noise), that is, the detected guide information. It is possible to avoid a situation in which the guide information cannot be detected due to the crosstalk.
- the track density is increased, guiding or tracking is possible, and the original function of generating a tracking signal, typically as a guide layer, is guaranteed.
- the track pitch is narrowed with respect to the diameter of the first light beam to such an extent that the first light beam is simultaneously irradiated to a plurality of adjacent tracks in the guide layer, for example, reflection caused by the first light beam.
- control information for example, servo mark or address information
- it can be reliably read as information based on reflected light or the like caused by the first light beam. Become. That is, the preformat information can be acquired stably.
- the first light beam for example, a red laser
- the second light beam for example, a blue laser
- a relatively small light spot of the second light beam is effectively used.
- the recording density in recording information on the recording layer is increased to the limit (that is, depending on the size). That is, when a narrow-pitch track corresponding to a narrow-pitch recording area that becomes a track after recording in the recording layer is previously built in the guide layer, the first light inevitably increased with respect to such a track.
- the light spot of the beam has the technical property that it is simultaneously irradiated over a plurality of tracks (for example, a large number of tracks such as 5 tracks). For this reason, it is necessary to perform a guide operation such as a tracking operation corresponding to a recording layer with a narrow pitch by using the first light beam that forms a relatively large light spot.
- the unique configuration in the present embodiment as described above has a corresponding effect.
- the pitch (for example, in the recording layer) is maintained while maintaining a guide function such as enabling tracking servo in a predetermined band or reading preformat information.
- An information track constructed by recording and having an information track commensurate with the beam diameter of the second light beam has a narrow pitch (to the same extent as the narrow pitch) (i.e., narrower than inappropriate for the first light beam). Pitch).
- the zone CAV method is adopted, so that the angular velocity increases as the zone or the writing position or reading position becomes the inner peripheral side (in other words, the angular velocity decreases as the outer peripheral side is reached). Therefore, for example, the arrangement relationship of the guide information recorded in advance on the track of the guide layer is arbitrary according to the radial position. For example, as is possible with the CAV (Constant-Angular-Velocity) method, it is fundamentally impossible to arrange information of a specific length in a row in a radial direction over a plurality of tracks.
- the track portion that enters the light spot depends on the radial position. It becomes arbitrary (that is, any information of a specific length is shifted in the track direction depending on the radial position), and the acquisition of the guide information has to be extremely unstable depending on the radial position.
- the guide area is consciously or positively shifted between the plurality of tracks in the radial direction as described above. For this reason, regardless of the radial position (that is, near the inner periphery or the outer periphery), a predetermined band corresponding to the high-density track pitch and recording linear density for realizing high-density recording.
- the guide operation such as tracking servo can be executed stably.
- the zone CAV method for example, if the predetermined distance and the shifting method are defined in advance according to the radial position, no problem occurs even if the zone CAV method is used.
- a plurality of specific areas each having a predetermined pattern are arranged on the track in addition to the plurality of guide areas. At least a part of the plurality of specific areas has an inner circumference in the radial direction so that a predetermined pattern possessed by the tracking servo can be detected at least at the time of recording (or at the time of reproduction). Are arranged in the same phase over the outer periphery.
- the “predetermined pattern” means a pattern that can be detected even when the tracking servo is in an open state, on the condition that they are arranged in the same phase from the inner circumference to the outer circumference in the radial direction.
- the predetermined pattern typically includes a portion formed of a groove track or a land track formed in each of a plurality of tracks adjacent in the radial direction.
- the start position is roughly aligned in the radial direction and the end position is at least within a certain range of areas such as each zone in the zone CAV. It is built in a region roughly aligned in the radial direction.
- a physical pattern such as a mark, a pit, or a partial groove, in which one type of predetermined pattern (for example, the first SYNC pattern) has at least one section in which the start position and the end position are substantially aligned in the radial direction
- the physical shape is formed on at least one of the adjacent tracks included in the beam diameter of the first light beam determined by ⁇ / NA (that is, wavelength / numerical aperture).
- Another kind of pattern (for example, the second SYNC pattern) having a different length in the direction along the track from this one kind of pattern is the same as the one kind of pattern on the end position side of the area. It is formed in a physical shape.
- the “predetermined pattern that can be detected when the tracking servo is open” typically means such a pattern.
- the same phase or “arranged in the same phase” means that they are arranged along or in the same radius without being separated in the track direction. Thus, this is not limited to literally riding completely on the same radius or being arranged in a complete line on the same radius, for example at least some width along the same radius (ie track (Width along the direction) is arranged with an overlap, or includes a case where they are arranged with some overlap while being slightly shifted along the track direction.
- the same phase from the inner circumference to the outer circumference in the radial direction typically means the entire area from the innermost circumference to the outermost circumference. It is the meaning which may be removed except for some parts. In other words, the effects of the present invention that enable the tracking servo pull-in and track jump described below to be possible with respect to the portions other than some portions can be obtained accordingly.
- a plurality of specific areas at least in part or in a main body portion (for example, the main body 24-2 of the specific area 24 in the embodiments described later) That is, they are arranged on a plurality of tracks that intersect with each other and are adjacent to each other with the same radius, typically without skipping any of the tracks.
- the plurality of specific regions are typically arranged on each of a plurality of tracks in the same phase (without skipping).
- “arranged in the same phase” typically means “arranged in each of a plurality of adjacent tracks in the same phase”.
- the light irradiation position that is, the optical pick writing position or the reading position
- a signal indicating that the track has been crossed (for example, a “zero cross signal”) needs to be detected.
- a track jump it is necessary to detect a signal indicating that the track has been crossed.
- a plurality of specific areas having a predetermined pattern are arranged. Therefore, when the tracking servo is pulled in at the time of recording or reproduction of the information recording medium, the plurality of specific areas are set. If the predetermined pattern occupying at least a part of the specific area is detected by moving the light irradiation position along the radial direction so that there is no problem with the start, continuation, and stop of the operation to pull in the tracking servo. It becomes possible to do without. That is, in relation to the tracking servo pull-in operation, if a part of the specific area is configured so that the number of grooves included in the beam diameter is one or less, zero crossing sufficient to perform the servo pull-in operation is performed.
- a group of signals is obtained.
- track jump is performed during recording or reproduction of the information recording medium, at least a part of the specific area is occupied by moving the light irradiation position along the radial direction along the plurality of specific areas. If the predetermined pattern is detected even when the tracking servo is closed, the track jump can be performed without any problem. Also in this case, in relation to the track jump, if a part of the specific area is configured so that the number of grooves included in the beam diameter is one or less, it is sufficient to perform the track jump operation. A zero cross signal is obtained.
- tracking servo pull-in operation is completed, or after a track jump or when the tracking servo is closed, tracking is performed using a guide area other than the specific area as described above. Just do it.
- tracks that can be recorded or reproduced in the recording layer while appropriately performing tracking servo pull-in operation and track jump operation by using a specific area and appropriately performing tracking operation by using a guide area Pitch and recording linear density (for example, linear recording density, pit pitch, or information transfer speed (that is, recording linear density ⁇ movement speed)) can be said to be “high density recording”, which is the original purpose of a multilayer information recording medium. It becomes possible to raise to the extent.
- the predetermined pattern is physically built in the guide layer by combining grooves and lands according to a predetermined rule.
- the predetermined pattern is arranged in the same phase as a combination of the predetermined rule of groove and land.
- the “predetermined rule” is a rule or rule set in advance for a combination of grooves and lands, for example, alternately arranged while having a certain length or a prescribed length in the track direction. It may also include rules for notches, notches, wobbles, etc. If a part of the specific region is configured such that the number of grooves or the like included in the beam diameter is one or less, a predetermined zero cross signal group can be obtained.
- the predetermined pattern has at least one of a wobble and a prepit structure, and a wobble and a partially cutout structure.
- the predetermined pattern in each specific area has a physical structure including at least one of a wobble and a prepit structure, and a wobble and a partially cutout structure.
- the “wobble and prepit structure” means a structure in which a wobbled or wobbled groove or land track is formed, and a prepit is formed in the groove or land.
- the “pre-pit” means a convex or concave pit or phase pit formed to be narrower than the groove width or land width in or on the groove or on the track on or in the land.
- the prepit may be a land prepit or a groove prepit.
- “wobble and partially cutout structure” means that a wobbled or wobbled groove or land track is formed, and a notch equivalent to the groove width or land width is provided in the groove or land. Means the structure. A case where a part of a land existing between adjacent grooves is notched, a case where a part of a groove present between adjacent lands is notched, and a combination thereof are conceivable.
- the physical structure may be configured to include a broad prepit having a partially cutout, and the broad prepit may be a land prepit in a broad sense or a groove prepit in a broad sense. Further, in addition to such a structure, the above-mentioned narrowly-defined prepits (that is, prepits not accompanied by a notch structure) can be formed together.
- the track is pre-constructed in the guide layer as a groove track or land track wobbled and formed with pits, or as a groove track or land track in which a part of the land or groove is cut out. Therefore, the construction is relatively easy, and finally, a highly reliable and stable guide operation is possible.
- the grooves and lands constituting the predetermined pattern may be at least partially straight grooves or straight lands. Furthermore, pits, notches, notches, and the like may be added to such straight grooves and straight lands.
- “Straight groove” or “straight land” means a straight groove (groove) in which no wobble or pit is formed or a bank (land) between the grooves. Note that the groove and the land are relative irregularities, and any of them may be concave and convex as viewed from the direction in which the first and second light beams are irradiated. For example, the groove is concave with respect to the main body substrate constituting the information recording medium, and the land is convex.
- the groove is convex and the land is concave as viewed from the direction in which the first and second light beams are irradiated.
- the “mirror surface” on which no groove track, land track, etc. are formed means a plain raw surface in which no information is embedded, and is the surface having the highest light reflectance in the guide layer.
- the predetermined pattern is arranged along the track direction, (i) a first SYNC pattern, (ii) a combination of the groove and the land according to the predetermined rule. And (iii) a second SYNC pattern different from the first SYNC pattern.
- the plurality of first SYNC patterns are arranged in the same phase and the plurality of second SYNC patterns are arranged in the same phase over a plurality of specific regions.
- the “SYNC (Synchronization) pattern” means a pattern that allows a specific signal waveform to appear at a predetermined frequency or a predetermined frequency during recording or reproduction. Since the first and second SYNC signals, which are signals detected in the specific region, each have a unique signal waveform, their detection can be performed easily and reliably. ⁇ 5> Further in this case, the first SYNC pattern is defined so that the presence of the main body can be detected in response to the detection, and the second SYNC pattern corresponds to the detection. It may be defined so that the end of the main body can be detected.
- the detection of the first SYNC pattern that causes a unique signal waveform to appear and the detection of the signal that occurs when the main body comes next, that is, when the main body crosses the track. It is possible to specify the time to start the operation (in other words, the time to perform the tracking servo pull-in operation or the track jump operation) or the arrival of the time. This makes it possible to appropriately start the tracking servo pull-in operation and the track jump operation. After that, detection of a signal generated when the main body crosses the track (in other words, tracking servo pull-in operation and track jump operation) is continuously performed to some extent, and then a unique signal waveform appears. The end of the main body is detected by detecting the SYNC pattern of 2.
- the tracking servo pull-in operation and the track jump operation can be appropriately stopped.
- the tracking servo pull-in operation and the track jump are completed before the second SYNC signal is detected.
- the tracking SYNC signal cannot be completed, the second SYNC signal is detected.
- the end of the specific area can be recognized, the operation using the specific area is forcibly terminated, and other options can be executed without delay, including re-execution with a lap delay.
- the main body portion and the first and second SYNC patterns are generated so that a specific signal is generated when crossing a track in a predetermined pattern including at least one of the first and second SYNC patterns. It may be configured.
- the information recording medium is a zone CAV method, and the track is concentric or spiral.
- the track jump is frequently performed, especially when the concentric track is adopted, or the track is appropriately selected even when the spiral track is adopted.
- a jump is performed.
- the specific area having the predetermined pattern described above is arranged in the guide layer, by using this, it becomes possible to start, continue, and stop the tracking servo without any problems.
- the track jump operation can be performed without any problem.
- each of the plurality of specific areas is located at a position corresponding to a position immediately before a portion where the ECC arrangement of data recorded in the plurality of recording layers is aligned in the radial direction. Has been placed.
- the specific area corresponds to the guide immediately before the portion where the ECC (Error Correction Code) of the data to be recorded on the recording layer is aligned in the radial direction, that is, immediately before the track direction.
- ECC Error Correction Code
- the position where the track jump should be performed and the timing to be obtained can be easily obtained.
- the switching timing or switching position of the tracking servo pull-in operation for the land or groove can be easily obtained.
- the guide information includes first recording address information from the inner periphery to the outer periphery along the track direction and a second recording address from the outer periphery to the inner periphery. At least one of the information is included.
- the first recording address information and the second recording address information are recorded on the single guide layer.
- the first recording address information and the second recording address information are recorded in two (or more) guide layers, respectively.
- the recording layer can be selectively used for the first recording layer recorded according to the first address information and the second recording layer recorded according to the second address information. Therefore, the operation of recording information from the inner periphery to the outer periphery in one or a plurality of first recording layers, and recording information from the outer periphery to the inner periphery in one or a plurality of second recording layers, It becomes efficient or easy.
- the reliability and stability of the recording operation can be remarkably improved by using two types of address information properly. Therefore, it is possible to realize an information recording medium capable of continuous bi-directional recording or arbitrary or independent bi-directional recording.
- the recording / reproduction can be performed between these two layers. Since the time required for switching is substantially the time required for performing the interlayer jump, it is extremely advantageous when recording / reproducing is performed continuously over a plurality of recording layers.
- the first recording address information is recorded in advance in one of the two types of slots arranged according to the first rule, and the two types of slots arranged according to the second rule different from the first rule. If the first recording address information is recorded in advance in one of them, the address information of the one necessary at that time can be reliably and stably detected while reducing the influence of the crosstalk.
- the track is a guide track for tracking servo, and the physical structure generates the tracking servo signal that constitutes at least part of the guide information.
- Each of the plurality of guide regions is a servo region for generating the tracking servo signal, and the predetermined distance is preset to a distance at which the tracking servo can operate in a predetermined band.
- the plurality of servo areas are shifted and arranged between the plurality of tracks based on the diameter of the tracking servo light beam so that the light beam is not simultaneously irradiated.
- the guide layer can generate a tracking error signal or the like in order to track the position in the recording surface related to each recording layer with the first light beam at least when recording information on each recording layer.
- This is the layer in which the structured track is built.
- a tracking error signal or the like can be detected from the reflected light obtained when the first light beam is focused on the track existing in the guide layer. According to the tracking error signal, tracking or tracking servo can be executed as a kind of guide operation.
- the plurality of servo areas are arranged in the track direction so as to be separated from each other by a distance within which a preset tracking servo can operate in a predetermined band.
- the distance between two servo areas adjacent to each other in the track direction is within the longest distance at which tracking signals can be generated continuously or continuously from the servo area at a frequency at which tracking operations can be performed stably.
- the plurality of servo areas are arranged so as to be shifted between the plurality of tracks based on the diameter of the first light beam for tracking servo so that the light beam is not irradiated simultaneously.
- the servo area is shifted correspondingly as described above.
- the tracking error signal (or the wobble signal that is the source) overlaps in both the track direction and the radial direction (or the tracking error signal component from other servo areas affects crosstalk noise).
- the tracking error signal cannot be detected can be avoided. That is, even if the track density is increased in this way, tracking becomes possible, and the original function of generating a tracking signal as a guide layer is guaranteed.
- a push-pull signal obtained from reflected light or the like caused by the first light beam is sampled, or a phase difference signal is sampled by a phase difference method (DPD).
- DPD phase difference method
- tracking with the tracking servo closed is performed stably using the guide area, while the tracking servo pull-in operation and track jump operation with the tracking servo opened are performed stably. Is possible.
- the track further includes a specific type of pattern signal in a center track portion located at least near the center in the radial direction among a plurality of track portions adjacent to each other in the radial direction intersecting the track.
- a plurality of signal detection regions each having a set of predetermined patterns straddling the plurality of track portions are arranged so as to be detectable.
- the plurality of signal detection regions include a set of predetermined patterns straddling a plurality of track portions adjacent to each other in the radial direction so that a specific type of pattern signal can be detected in the center track portion.
- the “center track portion” is at least near the center in the radial direction, such as being located at the center, center, or center line in the radial direction among a plurality of track portions adjacent in the radial direction in each signal detection region.
- the part of the track that is located For example, if the plurality of track portions are odd numbers such as 3, 5, 7,...,
- the center track portion is preferably the center track portion.
- track portions other than the center track portion are intentionally excluded from pattern signal detection targets even when the center of one light spot by the first light beam is directly on the track portion. That is, some signal or noise resulting from the predetermined pattern may be detected in the track portion other than the center track portion, but such signal or noise is not detected as noise from the beginning, or is discarded as noise after detection.
- the plurality of signal detection regions are typically arranged discretely in the track direction and discretely in the radial direction. For this reason, even if the track density is increased until the spot of the light beam straddles two or more adjacent tracks or track portions (for example, up to 5 tracks, 7 tracks, etc.), the detected pattern signal A situation in which the pattern signal cannot be detected due to the crosstalk can be avoided.
- a predetermined pattern is typically created in advance so that a tilt detection signal such as a tilt error signal can be generated as a pattern signal, or can be recorded at an arbitrary time after the start of use. For example, when a tilt occurs, a large signal change in the pattern signal can be obtained, which is extremely useful in practice.
- a predetermined line-symmetric pattern with the center track as the center line is formed so as to have a surface spread in a direction across a plurality of tracks. In this case, it is possible to generate a tilt detection signal having excellent sensitivity with respect to the tilt in the radial direction.
- a predetermined line-symmetric pattern with a line segment orthogonal to the track as a center line has a surface spread in a direction across a plurality of tracks. If formed, it is possible to generate a tilt detection signal with excellent sensitivity to the tilt in the track direction.
- a predetermined line-symmetric pattern with a line segment obliquely intersecting the track as a center line may be formed so as to have a surface spread in a direction across a plurality of tracks. Therefore, it is possible to generate a tilt detection signal having excellent sensitivity with respect to tilt in an oblique direction.
- the predetermined pattern may be configured such that various signals such as a signal, a distortion signal for correcting distortion, a light absorption signal for correcting light absorption, and a strategy signal for setting a strategy are detected as pattern signals.
- the predetermined pattern is, for example, each part of a plurality of tracks in an annular (that is, a hollow type) or a solid (that is, a centering type) planar region in which the outer ring shape is a circle, a rectangle, or the like so as to span a plurality of tracks
- a plurality of pits and a plurality of minute optical special portions are formed.
- the predetermined pattern is composed of a series or a set of a plurality of pits, a plurality of minute optical special portions, and the like.
- a specific type of processing based on a pattern signal such as tilt correction based on a tilt detection signal can be executed. It has been found that even though it is necessary to be able to detect the signal, it is possible to achieve it without forming pattern signals such as tilt detection signals continuously on all tracks. It is rather rare for a particular type of processing to be carried out continuously on an equal basis. That is, depending on the frequency or period of time when a specific type of processing is performed such that the tilt detection signal is detected once every time the tilt correction is held at a constant value (in other words, the period during which the tilt servo is locked). If the pattern signal such as the tilt detection signal is detected, it has been found that the specific purpose can be achieved.
- predetermined processing based on the pattern signals is executed completely or almost completely. Is possible.
- the pattern signal is detected at some interval or at any phase (for example, an angle on the disk), it is practically complete or almost complete. It is possible to carry out a predetermined process based on the pattern signal. After all, it is practically sufficient if the pattern signal is obtained intermittently at the center track portion representing each of a plurality of tracks, for example, every 5 or 7 tracks. Further, the phase position (for example, the angular position on the disk) where the pattern signal is detected may be aligned or may not be aligned.
- an opportunity that the center of the light spot of the first light beam is on the center track portion is captured as a pattern signal detection opportunity.
- the track portion other than the center track portion is intentionally excluded from the opportunity to detect the pattern signal even if the center of one light spot by the first light beam is on the track portion.
- the first light beam for example, a red laser
- the second light beam for example, a blue laser
- a relatively small light spot of the second light beam is effectively used.
- the recording density in recording information on the recording layer is increased to the limit (that is, depending on the size). That is, when a narrow-pitch track corresponding to a narrow-pitch recording area that becomes a track after recording in the recording layer is previously built in the guide layer, the first light inevitably increased with respect to such a track.
- the light spot of the beam has a technical property that it is irradiated simultaneously over a plurality of tracks (for example, multiple tracks such as 5 tracks and 7 tracks).
- the unique configuration of the present embodiment as described above has a corresponding effect.
- the degree of freedom in arrangement of a specific type of pattern signal such as a tilt detection signal is remarkably increased.
- a plurality of signal detection areas can be arranged independently of each other, that is, discretely, the information recording medium as a whole can be arranged with flexibility.
- the plurality of guide regions are in a plurality of slots that are not adjacent to each other in the track direction and are not adjacent to each other across the plurality of tracks in the radial direction. Is arranged. Typically, one is arranged in each of such some of the plurality of slots.
- the “slot” is a logical section or section obtained by dividing a track in the track direction, or a physical section or section.
- the slots are typically arranged continuously without gaps in the track direction and arranged without gaps or adjacent to each other in the radial direction.
- the slots may be arranged with a slight gap in at least one of the track direction and the radial direction.
- a track is constructed from an arrangement or a series of slots in a plurality of slots that are preliminarily arranged in the track direction in the guide layer.
- Guide areas are not adjacent to each other in the track direction and are arranged in some slots that are not adjacent to each other across multiple tracks in the radial direction, so they can be detected from multiple guide areas. It is possible to reliably reduce or eliminate crosstalk between various guide information.
- grooves, lands, pre-pits, etc. need only be created in the slot where the guide area is arranged, and it is not necessary to create these continuously throughout the track.
- the presence or absence of the slot (for example, the difference between the slot and the mirror surface) is easily and clearly distinguished physically, so that it is easy to detect, so that the guide information can be easily read and stably executed. This is very advantageous in practice.
- any slot in the recording layer can correspond to the slot in which the guide area in the guide layer is arranged, tracking servo in a predetermined band can be executed indirectly on the recording layer.
- information can be recorded in all slots at a high density up to the readable limit by the light spot formed by the second light beam.
- the plurality of specific regions are arranged in some of the plurality of slots that are not adjacent to each other in the track direction and are adjacent to each other across the plurality of tracks in the radial direction. Has been. In other words, they are arranged inside the slot group arranged in the radial direction. Typically, one slot is arranged in each of a plurality of slots forming the slot group.
- the first information recording apparatus of the present embodiment is an information recording apparatus for recording data on the information recording medium (including various aspects thereof) of the above-described embodiment
- the guide layer can be irradiated with a first tracking light beam and condensed, and one of the plurality of recording layers can be irradiated with a second light beam for data recording and condensed.
- a light irradiating means capable of receiving a first light based on the irradiated and condensed first light beam from the guide layer, and detecting the predetermined pattern based on the received first light.
- First pull-in control means for controlling the start or continuation of the pull-in servo pull-in operation, and the tracking servo based on other types of the predetermined patterns detected in the plurality of specific areas in the open state or in the middle of pull-in
- a second pull-in control unit that controls continuation or stop of the pull-in operation; and the light irradiation unit that applies the tracking servo to a desired track among the plurality of tracks based on the acquired guide information.
- the tracking servo means for controlling, and in the servo closed state where the tracking servo is applied, irradiating and condensing the second light beam to the one recording layer, thereby recording the data.
- Data recording control means for controlling the light irradiation means.
- the first light beam is irradiated and condensed on the guide layer by, for example, light irradiation means that is an optical pickup including two types of semiconductor lasers.
- the first light beam may be a light beam having a relatively large spot diameter such as a red laser light beam. That is, the light beam may be a light beam that is relatively large and has a large luminous flux that forms a large light spot that is irradiated over a plurality of tracks.
- the light receiving means includes, for example, a photodetector or a light receiving element such as a two-part or four-part CCD (Charged Coupled Device) that is formed integrally with the light irradiating means and at least partially shares an optical system such as an objective lens. Is done.
- the light receiving unit is configured to receive the first light through a prism, a dichroic mirror, a dichroic prism, or the like in an optical path different from the second light and the first and second light beams.
- the predetermined pattern possessed by the specific region is based on the first light received by the light receiving means, for example, a processor, a calculation It is detected by information acquisition means including a circuit, a logic circuit, and the like.
- the tracking servo pull-in operation is performed based on one type of predetermined pattern detected by the information acquisition means (for example, the first SYNC pattern detected when the tracking servo is open).
- the start is controlled by the first pull-in control means.
- a light irradiation means such as an optical pickup Is moved in the radial direction, which is the direction across the track.
- an actuator for tracking control in the light irradiation unit is controlled by feedback control or feedforward control, and the light beam formed by the first light beam is moved across the track.
- the light irradiation unit (Ie, the track in the guide layer corresponding to the radial position to be recorded information track after recording, which is to be recorded in the recording layer).
- the stop of the tracking servo pull-in operation is controlled by the second pull-in control means. Is done.
- a tracking servo means such as a tracking servo circuit confirms another type of waveform of a predetermined pattern, for example, a light irradiation means such as an optical pickup Is stopped in the radial direction, which is the direction across the track.
- a light irradiation means such as an optical pickup Is stopped in the radial direction, which is the direction across the track.
- an actuator for tracking control in the light irradiation means is controlled by feedback control or feedforward control, and the light beam formed by the first light beam is stopped at a radial position in the vicinity of the target track.
- the end of the specific area can be recognized by detecting the second SYNC signal, so the operation using the specific area is forcibly terminated.
- other options can be executed without delay, including re-execution with a round delay.
- first and second pull-in control means may be constructed as a single circuit.
- the tracking servo is pulled into the target track.
- the guide information carried by the physical structure of the guide region is acquired by the information acquiring means including, for example, a processor, an arithmetic circuit, a logic circuit, and the like.
- a tracking servo unit such as a tracking servo circuit or the like is used to apply a tracking servo in a predetermined band to the track or to close the tracking servo.
- the light irradiation means is controlled.
- an actuator for tracking control in the light irradiation unit is controlled by feedback control or feedforward control, and the light beam formed by the first light beam follows the track.
- the second modulated signal is modulated corresponding to the information to be recorded under the control of the data recording control means such as a processor in the state where the tracking servo is applied in the predetermined band or the tracking servo is closed.
- the light beam is irradiated and collected by the light irradiation means.
- the second light beam may be a light beam having a relatively small spot diameter such as a blue laser light beam as described above, aiming at high-density recording of information recording. From the viewpoint of increasing the recording information density, it is desirable that the second light beam is a thinner light beam.
- the second information recording apparatus of the present embodiment is an information recording apparatus that records data on the information recording medium (including various aspects thereof) of the above-described embodiment,
- the guide layer can be irradiated with a first tracking light beam and condensed, and one of the plurality of recording layers can be irradiated with a second light beam for data recording and condensed.
- a light irradiating means capable of receiving a first light based on the irradiated and condensed first light beam from the guide layer, and detecting the predetermined pattern based on the received first light.
- the information acquisition means for acquiring the carried guide information and the servo closed state in which the tracking servo is applied are based on one type of the predetermined pattern detected in the plurality of specific regions.
- a jump control means for controlling a track jump related to the track, and when the track jump is performed, a desired position in the plurality of tracks is searched based on the acquired guide information, and the servo close state
- a data recording control means for controlling the light irradiation means so as to record the data by irradiating and condensing the second light beam to the one recording layer.
- the first light beam is irradiated and condensed by the light irradiation unit, and the first light receiving unit collects the first light beam. Light is received.
- the predetermined pattern in the specific area is based on the first light received by the light receiving means, for example, a processor, a calculation It is detected by information acquisition means including a circuit, a logic circuit, and the like.
- one type of predetermined pattern detected by the information acquisition means for example, the first SYNC pattern or groove detected when the tracking servo is open as well as when the servo is closed
- the track jump is controlled by the jump control means.
- the tracking servo is preferably held.
- the tracking servo means such as a tracking servo circuit, for example, confirms that one type of waveform of the predetermined pattern is confirmed, and the light irradiation means such as an optical pickup tracks Is moved in the radial direction, which is the direction across
- the light irradiation means such as an optical pickup tracks Is moved in the radial direction, which is the direction across
- an actuator for tracking control in the light irradiation unit is controlled by feedback control or feedforward control, and the light beam formed by the first light beam is moved across the track. Before or after such movement, the number of traversed tracks is counted from the signal waveform corresponding to the detected predetermined pattern, so that the movement to the target track is controlled by the jump means.
- the light irradiation means is track-jumped in the radial direction so as to approach the target track, and finally the stop of the track jump is controlled by the jump means.
- the tracking servo means such as a tracking servo circuit, for example, (i) the number of crossed tracks, (ii) the track number of the target track, and (iii) start the track jump
- the light irradiation means such as an optical pickup is stopped at a radial position in the vicinity of the target track.
- the tracking servo can be pulled into the target track.
- the data recording control unit includes, for example, a search unit including a processor, an arithmetic circuit, a logic circuit, etc., before or after the track jump operation.
- a search unit including a processor, an arithmetic circuit, a logic circuit, etc.
- desired positions in a plurality of tracks are searched. That is, the target track is searched.
- the guide information is acquired by the information acquisition unit at the searched desired position, as in the case of the first information recording apparatus described above.
- the tracking servo is applied by the tracking servo unit.
- the light irradiation means is controlled to close the tracking servo.
- the second light beam is irradiated and condensed by the light irradiation unit, and data is sequentially recorded.
- the guide information is acquired by the information acquisition unit, as in the case of the first information recording apparatus described above.
- the tracking servo may be applied or the tracking servo may be applied.
- the light irradiation means is controlled so as to be closed.
- the second light beam is irradiated and condensed by the light irradiation unit, and data is sequentially recorded. Note that “when no track jump is performed” means that the track servo is not closed and the track servo is not closed. Including.
- the first information recording method of the present embodiment applies a first light beam for tracking to the guide layer on the information recording medium of the above-described embodiment (including various aspects thereof).
- a second pull-in control step for controlling continuation or stop of the pull-in operation, and the light irradiating means for applying the tracking servo to a desired track among the plurality of tracks based on the acquired guide information.
- the data is recorded by irradiating and condensing the second light beam on the one recording layer in a tracking servo process for controlling the tracking servo and a servo closed state where the tracking servo is applied.
- the same operation as in the case of the first information recording apparatus of the above-described embodiment is performed.
- information to be recorded such as content information and user information can be recorded at a high density on the recording layer in the information recording medium of the embodiment.
- the second information recording method of the present embodiment applies the first light beam for tracking to the guide layer on the information recording medium of the above-described embodiment (including various aspects thereof).
- a type of the predetermined pattern detected in the plurality of specific regions in an information acquisition step of detecting the carried guide information and the servo closed state in which the tracking servo is applied And a jump control step for controlling a track jump related to the track, and when the track jump is performed, a desired position in the plurality of tracks is searched based on the acquired guide information, and the servo close
- the second information recording method of the present embodiment operates in the same manner as in the case of the second information recording apparatus of the above-described embodiment, and finally performs the track jump while appropriately performing the above-described implementation.
- information to be recorded such as content information and user information can be recorded at a high density on the recording layer of the information recording medium of the embodiment.
- the first information reproducing apparatus of the present embodiment is an information reproducing apparatus for reproducing data from the information recording medium of the above-described embodiment (including various aspects thereof),
- the guide layer can be irradiated with a first tracking light beam and condensed, and one of the plurality of recording layers can be irradiated with a second light beam for data recording and condensed.
- a light irradiating means capable of receiving a first light based on the irradiated and condensed first light beam from the guide layer, and detecting the predetermined pattern based on the received first light.
- First pull-in control means for controlling the start or continuation of the pulling operation of the king servo, and the tracking servo is in the open state or in the middle of pulling in another type of the predetermined pattern detected in the plurality of specific regions
- Second pull-in control means for controlling the continuation or stop of the pull-in operation, and the light irradiation means so as to apply the tracking servo to a desired track among the plurality of tracks based on the acquired guide information.
- Tracking servo means for controlling the light, and in the servo-closed state where the tracking servo is applied, receiving the second light based on the irradiated and condensed second light beam from the one recording layer, Data acquisition means for acquiring the data based on the received second light.
- the first light beam is irradiated and condensed on the guide layer by the light irradiation means.
- the first light based on the first light beam is received by the light receiving means.
- a predetermined pattern included in the specific area is detected by the information acquisition unit based on the first light received by the light receiving unit.
- the start of the tracking servo pull-in operation is controlled by the first pull-in control means based on one type of the predetermined pattern detected by the information acquisition means before or after this detection.
- the light irradiating means is moved in the radial direction to the side closer to the target track based on the predetermined pattern detected by the information acquiring means in the state where the tracking servo is open or in the middle of pulling in as described above. . Further, based on another type of the predetermined pattern detected by the information acquisition unit, the stop of the tracking servo pull-in operation is controlled by the second pull-in control unit.
- the tracking servo is pulled into the target track.
- the guide information carried by the physical structure of the guide region is acquired by the information acquiring means.
- the light irradiation means is controlled by the tracking servo means so that the tracking servo is applied to the track in a predetermined band or the tracking servo is closed.
- the second light beam is transmitted by the light irradiation means under the control of the data acquisition means such as a processor.
- the layer is irradiated and collected.
- recorded information such as content information and user information can be reproduced with high density while appropriately performing tracking servo pull-in suitably from the recording layer in the information recording medium of the above-described embodiment. It becomes.
- tracking is performed on an information track composed of an array or a series of recorded recording information by using only the second light beam without using tracking by the guide layer, that is, without using the first light beam. It is also possible to reproduce information from the information track. That is, when reproducing information, only the second light beam is used, and when recording information, both the first and second light beams are used. It is also possible to construct. Since only the second light beam is used during information reproduction, reproduction is performed with relatively low power consumption and simple control (that is, compared with the case where the first light beam is also used during reproduction). It becomes possible.
- the second information reproducing apparatus of the present embodiment is an information reproducing apparatus for reproducing data from the information recording medium (including various aspects thereof) of the above-described embodiment.
- the guide layer can be irradiated with a first tracking light beam and condensed, and one of the plurality of recording layers can be irradiated with a second light beam for data recording and collected.
- Light irradiation means capable of emitting light and first light based on the irradiated and collected first light beam from the guide layer are received, and the predetermined pattern is received based on the received first light.
- Information acquisition means for detecting the carried guide information and one of the detected predetermined patterns in the plurality of specific regions in a closed state where the tracking servo is applied.
- a jump control means for controlling a track jump related to the track, and when the track jump is performed, a desired position in the plurality of tracks is searched based on the acquired guide information, and the servo close
- a data acquisition means for receiving a second light based on the irradiated and condensed second light beam from the one recording layer and acquiring the data based on the received second light; Is provided.
- the first light beam is irradiated and condensed by the light irradiating means, and the first light receiving means collects the first information. Light is received.
- a predetermined pattern in the specific area is detected by the information acquiring unit based on the first light received by the light receiving unit.
- the track jump is controlled by the jump control means based on one type of the predetermined pattern detected by the information acquisition means before or after the detection.
- the light irradiation means is track-jumped in the radial direction so as to approach the target track, and finally the stop of the track jump is controlled by the jump means. Further, in the state where the tracking servo is applied in the predetermined band or the tracking servo is closed as described above, the second light beam is irradiated and condensed on the desired recording layer by the light irradiating means, and desired. In the recording layer, recorded information is reproduced.
- recorded information such as content information and user information can be reproduced at high density while appropriately performing track jumping suitably from the recording layer in the information recording medium of the above-described embodiment.
- the first information reproducing method of the present embodiment applies a first light beam for tracking to the guide layer from the information recording medium of the above-described embodiment (including various aspects thereof).
- the same operation as in the case of the first information reproducing apparatus of the above-described embodiment is performed, and tracking servo pull-in is appropriately performed.
- recorded information such as content information and user information can be reproduced with high density from the recording layer in the information recording medium of the embodiment.
- the second information reproducing method of the present embodiment applies a first light beam for tracking to the guide layer from the information recording medium of the above-described embodiment (including various aspects thereof).
- the second information reproducing method of the present embodiment it operates in the same manner as in the case of the second information reproducing apparatus of the above-described embodiment, and finally performs a track jump appropriately while officially finalizing Is preferably recorded from the recording layer of the information recording medium of the above-described embodiment, for example, recorded information such as content information and user information at a high density.
- the information recording medium includes a guide layer and a plurality of recording layers, and a plurality of guide areas and a plurality of specific areas are arranged on the track. It is possible to increase the track pitch and recording linear density that can be recorded or reproduced in the recording layer while appropriately performing the pull-in and track jump.
- the light irradiation means, the information acquisition means, the first and second pull-in control means, the tracking servo means, and the data recording control means are provided.
- the information recording method 1 since the information acquisition process, the first and second pull-in control processes, the tracking servo process, and the data recording control process are provided, it is suitable for the recording layer in the information recording medium of the above-described embodiment.
- information to be recorded such as content information and user information can be recorded at a high density while appropriately performing tracking servo pull-in.
- the light irradiation means, the information acquisition means, the jump control means, and the data recording control means are provided.
- the second information recording method according to the present embodiment Since the information acquisition step, the jump control step, and the data recording control step are provided, for example, content information, user information, etc. are recorded while appropriately performing the track jump on the recording layer in the information recording medium of the embodiment described above.
- the information to be recorded can be recorded at high density.
- the first information reproducing apparatus includes the light irradiation means, the information acquisition means, the first and second pull-in control means, the tracking servo means, and the data acquisition means.
- the tracking servo is preferably used from the recording layer in the information recording medium of the above-described embodiment. The recorded information can be reproduced at a high density while appropriately pulling in.
- the light irradiation unit, the information acquisition unit, the jump control unit, and the data acquisition unit are provided.
- an optical disk 11 is a multi-layer recording type, and includes a single guide layer 12 and a plurality of recording layers 13.
- FIG. 1 shows a plurality of layers constituting one optical disk 11 shown on the left half surface in the drawing, and the right half surface in the drawing is spaced from each other in the stacking direction (vertical direction in FIG. 1). It is a typical perspective view made easy to see each layer by opening and disassembling.
- the optical disk 11 At the time of recording, it is used for tracking servo and the first beam LB1 as an example of the “first light beam” according to the present invention, and “second light” for information recording and according to the present invention.
- the second beam LB2 as an example of the “beam” is irradiated at the same time.
- the first beam LB1 and the second beam LB2 for information reproduction are simultaneously irradiated.
- the second beam LB2 can be used as a single light beam for tracking servo and information reproduction (that is, the first beam LB1 is not used). .
- the optical disk 11 is a zone CAV system and is pre-recorded on a concentric or spiral track TR, and a tracking error signal (or a wobble signal that is the source) detected at the time of information recording or reproduction, address information (or The original pre-pit signal) is arranged along the track in accordance with the zone CAV system.
- a tracking error signal or a wobble signal that is the source
- address information or The original pre-pit signal
- the second beam LB2 is focused on one desired recording layer 13 that is a recording target or a reproduction target among the plurality of recording layers 13 stacked on the guide layer 12.
- the second beam LB2 is a blue laser beam having a relatively small diameter, for example, like a BR (Blu-ray) disc.
- the first beam LB1 is a red laser beam having a relatively large diameter, for example, like DVD.
- the diameter of the light spot formed by the first beam LB1 is, for example, about several times the diameter of the light spot formed by the second beam LB2.
- each of the plurality of recording layers 13 is composed of, for example, a translucent thin film containing a two-photon absorption material.
- a two-photon absorption material a fluorescent type using a fluorescent material in which the fluorescence intensity in a region where two-photon absorption occurs is changed, a refractive index changing type using a photorefractive material in which the refractive index is changed by electron localization, etc.
- photochromic compounds, bis (aralkylidene) cycloalkanone compounds, etc. is promising as refractive index changing type two-photon absorption materials.
- a bulk type in which the entire optical disk 11 is made of a two-photon absorption material and (ii) a recording layer of two-photon absorption material and a spacer layer of another transparent material are alternately arranged.
- the layer structure type has an advantage that focus servo control can be performed using light reflected at the interface between the recording layer 13 and the spacer layer.
- the bulk type has an advantage that the manufacturing cost can be suppressed because there are few multilayer film forming steps.
- recording can be performed by changing the optical characteristics such as refractive index, transmittance, absorption rate, and reflectance in response to at least one of the wavelength and intensity of the second beam LB2.
- any stable material may be used.
- a light-transmitting or translucent photosensitive material such as a photopolymer that causes a photopolymerization reaction, a photo-anisotropic material, a photorefractive material, a hole burning material, a photochromic material that absorbs light and changes its absorption spectrum, Conceivable.
- a phase change material, a two-photon absorption material, or the like that is sensitive to the second beam LB2 having the wavelength ⁇ 2 and not sensitive to the first beam LB1 having the wavelength ⁇ 1 ( ⁇ 2 ⁇ 1) is used.
- Each of the plurality of recording layers 13 may be, for example, a dye material in addition to the above-described two-photon absorption material and phase change material.
- the track TR is not formed in advance in an unrecorded state.
- the optical disc 11 With respect to the optical disc 11 in which such a plurality of recording layers 13 are laminated on the guide layer 12, at least at the time of information recording, these diameters and depths of focus are different through a common objective lens 102L included in the optical pickup.
- the first beam LB1 and the second beam LB2 are irradiated almost or coaxially in practice.
- the tracking operation for the second beam LB2 is performed by the tracking operation for the track TR of the guide layer 12 by the first beam LB1 (in particular, no track exists on the recording layer 13 during recording).
- the first beam LB1 and the second beam LB2 are irradiated through a common optical system such as the objective lens 102L (in other words, an optical system in which the positional relationship between the irradiated light beams is fixed).
- the positioning of the first beam LB1 in the plane of the optical disc 11 can be used as the positioning of the second beam LB2 in the plane of the optical disc 12 (that is, in the recording plane of each recording layer 13).
- the track TR of the guide layer 12 includes a plurality of servo areas each having a tracking error signal (or a signal for generating a tracking error such as a wobble signal as a source thereof) and a physical structure that carries a prepit signal.
- the tracking error signal and the pre-pit signal constitute an example of “guide information for guide” according to the present invention.
- the plurality of servo areas constitute one example of “a plurality of guide areas” according to the present invention.
- FIGS. 3 to 6 each show an enlarged view of the track portion of the guide layer 12 on which wobbling has been performed.
- FIG. 3 shows a track portion where wobbling is simply performed in the embodiment
- FIG. 4 shows a guide layer 12 in a comparative example in which grooves, lands, etc. are formed without gaps over the entire area of each track. Indicates the track part.
- FIG. 5 shows a track portion having “wobble and partially cutout structure” in the embodiment and wobbling
- FIG. 6 has “wobble and narrow land pre-pit” in the embodiment and wobbling. The applied track part is shown.
- a groove track GT corresponding to a specific example of the track TR in FIG. 1 is formed in the guide layer 12.
- a reflective film 12a which is a thin film made of a light-reflective material, is formed on a transparent film 12c as a substrate on which concave and convex grooves are formed, and further a transparent or opaque film as a protective film It is formed by being filled with 12b.
- the groove track GT or the groove is formed in a convex shape on the upper side in FIG.
- the groove track GT is formed by forming the reflective film 12a on the transparent or opaque film 12b as the base material on which the concave and convex grooves are formed, and further filling with the film 12c as the protective film.
- the groove track GT has a wobble WB on the side wall.
- the groove track GT is formed such that the side wall wobbles (meanders) along the track direction.
- each groove track GT indicated by a one-dot difference line is recorded information formed by recording information that the recording layer 13 (see FIG. 1) has after recording. They are arranged at a track pitch corresponding to the track pitch of the track.
- the arrangement on the recording layer 13 of the recorded information along the track TR that has already been recorded along the track TR of the guide layer 12 will be simply referred to as “recorded information track” as appropriate.
- the information-recorded track is physically formed on the recording surface of the recording layer 13 by irradiation of the second beam LB2 at the time of recording, the portion where the fluorescence intensity is changed, the portion where the refractive index is changed, the phase change portion, the dye It can be said that it is a series of ridges along the track TR of the guide layer 12, such as a changed portion. That is, in FIG. 3, the groove is formed at a frequency at which a tracking error can occur at a predetermined frequency even for the groove track GT in which no groove is formed. That is, at the radial position and the track direction position not shown in FIG. 3, grooves are appropriately formed on the groove track GT, and the groove track GT on which no groove is formed over the circumference is Basically does not exist.
- the recording layer 13 in the comparative example, the recording layer 13 (see FIG. 1) after recording has a track pitch corresponding to the track pitch of the recorded information track formed by the recording information, and covers the entire track direction and radial direction. Thus, grooves and lands are formed.
- the groove track GT is because the recording layer also serves as the guide layer or because the recorded information track of the recording layer and the guide track of the guide layer have a one-to-one correspondence.
- the guide layer is also configured as in the comparative example of FIG.
- the groove is not formed over the entire area along the track direction on the groove track GT.
- the grooves are not formed on the groove tracks GT adjacent to each other in the radial direction.
- a groove notch GN1 having a partially cut structure may be formed in the groove track provided in the guide layer 12 (see FIG. 1).
- a notch is a mirror surface that is cut out over one track width of a groove track.
- a land prepit LPP1 may be formed in the land part LP.
- the land prepit LPP1 is also formed in the comparative example of FIG.
- the groove notch GN1 in FIG. 5 and the LPP1 in FIG. 6 have the same effect although appearing in the opposite direction when the guide layer is reproduced.
- prepits may be appropriately formed even for land parts LP where no prepits are formed.
- the light spot SP1 is not relatively large with respect to the track pitch and performs tracking for low density recording.
- the light spot SP1 has a diameter of about 1 ⁇ m (relative to the track pitch of 0.5 ⁇ m), and has little or no influence as a noise of signals on the tracks TR1 and TR3 other than the track TR2 that is focused and followed by itself. Not received at all in practice. That is, with respect to all the tracks TR1, TR2, TR3,..., There are no gaps in the radial direction and the track direction, a groove structure or a wobble structure (see FIG. 3), a partially cut-out structure (see FIG. 5), Even if a pre-pit structure (see FIG. 6) is provided, no crosstalk occurs in the tracking error signal (or the wobble signal that is the source). For this reason, tracking can be executed.
- the light spot SP1 performs tracking for high-density recording, which is relatively large with respect to the track pitch.
- the light spot SP1 has a diameter of about 1 ⁇ m (relative to the track pitch of 0.25 ⁇ m), and is used as noise of signals on the tracks TR1, TR2, TR4, and TR5 other than the track TR3 that is focused and followed by itself. It is significantly affected. That is, if a groove structure or a wobble structure (see FIGS. 3 to 6) is given to all the tracks TR1, TR2, TR3,. Crosstalk occurs remarkably. This makes tracking impossible.
- the address positional relationship (address difference) on a plurality of adjacent tracks TR changes depending on the radial position. Even if tracking is possible at one location, there is a significant possibility that tracking will be impossible at other locations (that is, at locations where the degree of proximity of other signal generation regions adjacent in the radial direction becomes strong). .
- the land pre-pit LPP1 exists in the vicinity as shown in FIG. That is, the pre-pit signal recorded in the land pre-pit LPP1 surrounded by a broken-line circle in the figure provided for the other track TR5 with respect to the land pre-pit LPP1 provided for the track TR3 to be tracked. (That is, the land pre-pit signal) affects as noise.
- the land prepit LPP1 cannot be detected at any position, or the land prepit LPP1 cannot be detected depending on the radial position or the track direction position. In other words, it becomes impossible to detect address information or the like by the pre-pit signal. In this way, an arrangement that reduces not only adjacent tracks but also crosstalk between tracks separated by two tracks or more is required.
- the situation as shown in FIG. 8 uses the second beam LB2 (for example, a blue laser similar to the BR disc) corresponding to high-density recording on the recording layer 13 so that the information recording track has a narrow pitch after recording.
- the narrow-pitch track TR is formed in the guide layer 12 in advance and the first beam LB1 (for example, red laser as in the DVD) corresponding to the low density recording is used for the guide layer 12, it is inevitable. Will occur.
- the first beam LB1 is used for the guide layer 12 and the second beam LB2 having a smaller diameter than the first beam is used for the recording layer 13, the technically generated technically occurs. It can be said that this is a serious restriction. If the track TR having a pitch corresponding to the first light beam LB1 is formed on the guide layer 12, it does not help at all for performing tracking for high-density recording in the recording layer 13.
- the specific purpose of tracking in a predetermined frequency band is to generate a tracking error signal at any timing in any track TR, but a wobble structure for detecting a tracking error signal
- the pre-pit structure (see FIGS. 3 to 6) can be achieved without continuously forming on the track TR in the track direction. That is, a tracking error signal is generated in the entire area along the track direction on the track TR if the arrangement interval (that is, the arrangement pitch) is equal to or less than the longest distance at which the tracking servo can operate in a predetermined frequency band.
- the arrangement interval that is, the arrangement pitch
- positions aligned in the radial direction that is, positions or regions having the same phase or the same phase, in other words, the same angle on the optical disc 11.
- positions aligned in the radial direction that is, positions or regions having the same phase or the same phase, in other words, the same angle on the optical disc 11.
- the tracking error signal not only the tracking error signal but also a specific purpose of detecting a prepit signal constituting control information for other recording control or reproduction control such as address information using a prepit such as the land prepit LPP1. Therefore, it is not necessary to build a wobble structure or a pre-pit structure (see FIGS. 3 to 6) in the entire area along the track direction on the track TR. For example, it is possible to detect control information without recording all information in advance in the track direction and the radial direction as if stuffing bits are packed in an unrecorded track.
- a plurality of servo areas are discrete in both the track direction and the radial direction as described below. Provided.
- the guide layer 12 includes a mirror area 21 as “area 1” and a servo area 22 that also serves as a “mark area” capable of generating mark information of a detection pattern as “area 2”.
- the “region 3” includes a pattern region 23 having a predetermined pattern 23a capable of generating a tilt detection signal
- the “region 4” includes a specific region 24 having a predetermined pattern that can be detected even when the tracking servo is open on the track 24G. And are arranged.
- FIG. 9 for convenience, it is illustrated in two stages, but the four regions may be arranged in a line along the same track on the guide layer 12.
- a straight groove or a straight land may be formed in the mirror surface region 21.
- the mirror surface region 21 can also be referred to as a “groove region”.
- the mirror surface area 21 can also be referred to as a "buffer area”. This is an example of such a “buffer area”.
- the mirror surface region 21 is an example of the “buffer region” according to the present invention, and is, for example, a region having a straight groove.
- the mirror surface area 21 is adjacently disposed in front of the front and rear of the last in each of the plurality of servo areas 22 in the track direction.
- the buffering action in the mirror surface area 21 provides a preparation period for signal detection from the servo area 22 in the servo system during information recording or the like.
- the first beam LB1 is allowed to enter the servo area 22 in a tracking-on state during information recording. That is, the mirror surface area 21 arranged on the head side of the servo area 22 gives a very effective preparation period for stable operation of the tracking servo.
- the servo area 22 is an area in which a wobble structure or a prepit structure is created in advance, that is, an area where a tracking error signal or a prepit signal can be detected.
- the servo areas 22 are discretely arranged in the track direction (left and right direction in FIG. 9) as arrangement intervals (that is, arrangement pitch) with a predetermined distance or a distance less than the predetermined distance.
- the plurality of servo regions 22 are actively or actively left and right between the plurality of tracks TR across the plurality of adjacent tracks TR in the radial direction (that is, in the vertical direction in FIG. 9). They are shifted (ie, along the track direction).
- the mark information is arranged immediately before the pattern area 23 on the center track 23TR, and indicates that the pattern area 23 comes immediately after. Therefore, when mark information is first detected in the servo area 22 during recording or reproduction, it is found that the pattern signal in the pattern area 23 arrives without delay thereafter.
- the mark information indicates a timing at which the subsequent pattern area 23 should be sampled on the center track 23TR or an address position from the inner periphery to the outer periphery or from the outer periphery to the inner periphery along the track direction of the subsequent pattern area 23. . Therefore, when mark information is first detected in the servo area 22 at the time of recording or reproduction, it is subsequently determined at which timing or at which address position the pattern signal arrives.
- the wobble signal detected by the push-pull signal is detected with an offset in the pattern area 23. Therefore, it can be recognized whether or not the first light beam is on the center track 23TR.
- the pattern area 23 is an example of the “signal detection area” according to the present invention, and a specific type of pattern signal is transmitted in the center track 23TR (track indicated by a one-dot chain line extending in the right and left in FIG. 9).
- a predetermined pattern 23a is formed that spans seven tracks adjacent in the radial direction (vertical direction in FIG. 9).
- the track portion other than the center track 23TR is intentionally excluded from the pattern signal detection target even when the center of the first light spot LS1 by the first light beam is directly on the track portion.
- the pattern areas 23 are discretely arranged in the track direction (left and right direction in FIG. 9) and discretely in the radial direction (up and down direction in FIG. 9). For this reason, even if the track density is increased until the spot of the light beam straddles seven adjacent tracks, a situation in which the pattern signal cannot be detected due to the crosstalk of the detected pattern signal can be avoided. .
- the predetermined pattern 23a is created in advance so that a tilt detection signal such as a tilt error signal can be generated as a pattern signal, a large signal change in the tilt detection signal can be obtained when a tilt occurs.
- the predetermined pattern 23a is formed from a plurality of short pits, embosses or embossed pits formed on a groove or land having a short notch that forms local irregularities, or a groove track or land track. For example, when straddling seven tracks, it is composed of a set of ten embossed pits, etc., with five on one side and both sides.
- the predetermined pattern 23a is formed so as to substantially match the outer ring shape of the light spot LS1, and has a shape that substantially follows the bright ring LS1a when it occurs. The wobble may be combined with the predetermined pattern 23a.
- the predetermined pattern 23a in the pattern area 23 includes an eccentric signal for correcting the eccentricity of the disc, an inclination signal for correcting the tilt of the disc surface, an aberration signal for correcting the aberration of the optical system, and an optical beam.
- Various signals such as phase difference signal for phase difference correction, distortion signal for distortion correction, light absorption signal for light absorption correction, strategy signal for strategy setting are configured to be detected as pattern signal It's okay.
- the specific purpose of enabling the tilt correction based on the tilt detection signal is to detect the tilt detection signal in any track TR, but the tilt detection signal is applied to all the tracks TR. Even if it does not form continuously, it can be achieved. That is, if the tilt detection signal is detected according to the frequency or period of tilt correction such that the tilt detection signal is detected once every period during which the tilt servo is locked, the specific purpose is achieved. Is possible.
- tilt correction can be executed if a tilt detection signal can be obtained for every seven tracks of one GR.
- tilt correction can be executed if a tilt detection signal can be obtained with some interval or at any phase (for example, an angle on the disk). In the end, it is sufficient if the tilt detection signal is obtained intermittently at the center track 23TR representing them every seven tracks of one group GR.
- the first beam LB1 (for example, a red laser) has a larger beam diameter than the second beam LB2 (for example, a blue laser), so that one group GR is configured using the first beam LB1. It is extremely convenient to detect a set of predetermined patterns 23a across the seven tracks TR.
- the pattern region 23 having the tilt detection pattern can be arranged with a degree of freedom.
- by providing pattern signals other than the tilt detection signal in correspondence with processes other than tilt correction it is possible to execute other processes in parallel or appropriately with tilt correction.
- the servo area 22 carrying the mark information indicating that the pattern area 23 comes after the center area 23TR in the track direction of the pattern area 23 is arranged.
- the mark information is information reproduced by a wobble signal, a prepit signal, or the like corresponding to a wobble, a prepit, or the like discretely created in the servo area 22.
- the tilt detection signal can be read easily and reliably based on the arrival of the landmark information. For example, after detection of the mark information, it is possible to start preparation for starting detection of a tilt detection signal and further start preparation for starting tilt correction based on the tilt detection signal. For example, by predefining the phase relationship and interval between the tilt detection signal and the mark information, the sampling timing for detecting the tilt detection signal can be easily specified from the mark information. Alternatively, if the mark information has an address position where the tilt detection signal is recorded, the sampling timing for detecting the tilt detection signal can be easily specified.
- the specific areas 24 are arranged in the same phase from the inner circumference to the outer circumference in the radial direction so that the predetermined pattern that the tracking servo has can be detected when the tracking servo is open during recording or reproduction of the optical disc 11. ing.
- the specific area 24 is physically built in the guide layer 12 by combining grooves and lands on the groove track 24G according to a predetermined rule.
- the specific area 24 is a first SYNC pattern area 24- having a first SYNC pattern, which is an example of “one type” of (i) predetermined patterns arranged along the track direction (left and right direction in FIG. 10). 1, (ii) a main body region 24-2 in which an example of a “main body” of a predetermined pattern is arranged, and (iii) an “other type” of a predetermined pattern different from the first SYNC pattern,
- the second SYNC pattern area 24-3 having the following SYNC pattern.
- Each of the first and second SYNC patterns has at least one of a wobble and pre-pit structure, and a wobble and a partially notched structure (see FIGS. 3 to 6), and has unique patterns that can be distinguished from each other. However, the lengths in the track direction are also different from each other.
- the main body portion of the predetermined pattern has a combination in which straight grooves or straight lands are simply arranged alternately.
- such a pattern in the specific area 24 can be detected when the tracking servo is open during recording or reproduction, but can be detected even when the tracking servo is closed.
- the tracking servo pull-in operation is suitably executed, and when the pattern is detected even in the servo closed state, the track jump operation is more suitably executed. .
- the concentric or spiral tracks TR including the four regions as described above on the guide layer 12 are grouped into units of a plurality of groups GR.
- the track located at the center is determined as the center track 23TR.
- a predetermined pattern of the pattern area 23 is determined based on the position of the center track 23TR determined in this way.
- the specific area 24 is arranged in the same phase (in FIG. 11, an elongated fan-shaped area extending from the center of the disk to the right side).
- the specific area 24 is an area including a plurality of adjacent groove tracks 24G.
- the track forming surface on the guide layer 12 on which the concentric or spiral track TR configured as described above is formed is divided according to the zone CAV method. . That is, elongated regions along the circumference having substantially the same radial position are assigned as zone 1, zone 2, zone 3,.
- the specific region 24 is arranged so as to extend over a plurality of adjacent zones 1,.
- the specific region 24 is arranged so as to extend over a plurality of adjacent zones 1,... (The upper contour line in FIG. 13) is not a straight line, but has a slight step for each zone.
- FIG. 14 shows a specific configuration example when data is arranged in the servo area 22, the pattern area 23, and the specific area 24 among the above-described four areas provided in the guide layer 12.
- wobbles are formed in slot units as mark information.
- the sample servo marks 300S are also widely distributed in the left side of the drawing in the servo area 22 (servo area 22 also serving as the servo area), and in each track TR (Track 1 to Track 7), in the track direction (FIG. 14). It is formed in slot units discretely in the middle and left and right directions and spaced by two tracks in the radial direction (vertical direction in the figure).
- the slot 300A is arranged in such a manner that the sample servo marks 300S are widely distributed in a predetermined rule as described above, and in the pattern region 23, the slot 300B is substantially in the radial direction. Arranged in a uniform manner.
- a tilt detection pattern is formed in slot units as a pattern signal in the slot 300B.
- one pattern is constructed as a tilt detection pattern so as to straddle seven tracks.
- the upper half of the outer ring circumference of the light spot LS1 that is, the bright ring LS1a
- a pattern covering the lower half of the outer ring circumference of the light spot LS1 ie, the bright ring LS1a is formed at a slight distance.
- One tilt detection pattern is constructed from these two patterns.
- a physical structure (see FIGS. 16 to 19) having a predetermined pattern, which will be described in detail later, is formed in each of a plurality of tracks.
- the light spot is a low-density track in which three tracks are simultaneously irradiated, the light spot is arranged in the radial direction (in the figure).
- a tracking error signal having an amplitude suitable for pulling in the tracking servo or enabling the track jump can be obtained from the unevenness of the B section.
- the SYNC pattern and the groove are provided only on the groove track GT, and the land track LT is left as a mirror surface, so that an intermittent groove is constructed as a whole.
- FIG. 15 shows that the first SYNC pattern area is used as a signal indicating the start of the main part of the pattern in the center of the figure.
- FIGS. 16 to 19 first and second examples respectively showing that a desired tracking error signal can be generated and that such a region starts and ends can be identified, as in the example of the right half of FIG.
- FIGS. 16 to 19 show the first SYNC pattern region 24-1, the main body region 24-2, and the second SYNC pattern region 24-3, which are arranged along the track direction, respectively.
- the darkly drawn portion on the track is uneven as a groove or land compared to other places.
- “SYNC pattern” is provided every other track in the main body region 24-2 from the inner periphery to the outermost periphery.
- “SYNC patterns” are formed by intermittent grooves or pits, and the positions thereof are formed so as to be approximately aligned in the radial direction.
- the “SYNC pattern 1” in the first SYNC pattern area 24-1 and the “SYNC pattern 2” in the second SYNC pattern area 24-3 are formed with different lengths.
- “SYNC pattern” is provided in the main body region 24-2 from every inner track to every outermost track.
- “SYNC patterns” are formed by intermittent grooves or pits, and the respective positions are formed so as to be substantially aligned in the radial direction.
- the “SYNC pattern 1” in the first SYNC pattern area 24-1 and the “SYNC pattern 2” in the second SYNC pattern area 24-3 are formed with different lengths.
- “SYNC pattern” is provided every two tracks in the main body area 24-2 from the inner periphery to the outermost periphery.
- “SYNC patterns” are formed by intermittent grooves or pits, and the respective positions are formed so as to be substantially aligned in the radial direction.
- the “SYNC pattern 1” in the first SYNC pattern area 24-1 and the “SYNC pattern 2” in the second SYNC pattern area 24-3 are formed with different lengths.
- the track pitch is set smaller than in other specific examples.
- a “SYNC pattern” is provided in the main body region 24-2 every other track.
- “SYNC patterns” are formed by intermittent grooves or pits, and the respective positions are formed so as to be substantially aligned in the radial direction.
- “SYNC pattern 1” in the first SYNC pattern area 24-1 is formed as a repetitive pattern of a predetermined length.
- the “SYNC pattern 2” in the second SYNC pattern region 24-3 is formed as a continuous groove structure having a predetermined length.
- the specific area 24 has a detectable pattern even when the tracking servo is open. That is, the tracking error signal obtained when the light spot LS1 moves as indicated by the arrow AR11 while the tracking servo is open has a sufficient amplitude to perform tracking servo pull-in and track jump (see FIG. 15).
- the specific pattern 24 has the start positions on the optical disc 11 roughly aligned in the radial direction, and the end positions at least in a certain range such as each zone in the zone CAV. Within the region, it is formed in a region roughly aligned in the radial direction (see FIGS. 11 to 13).
- the first SYNC pattern of the predetermined patterns is formed in a physical shape such as a mark, a pit, or a partial groove, which has at least one section in which the start position and the end position are substantially aligned in the radial direction.
- the physical shape is formed on at least one track in the first SYNC pattern area 24-1 (that is, the start position side of the specific area 24).
- a physical shape is formed on at least one of the adjacent tracks 24G included in the diameter of the light spot LS1 determined from ⁇ / NA (that is, wavelength / numerical aperture) of the first beam LS1.
- the second SYNC pattern having a different length in the direction along the track from the first SYNC pattern is the same as the first SYNC pattern in the second SYNC pattern area 24-3 (that is, the end position side of the specific area 24). It is formed in a physical shape in the manner of.
- grooves or lands are alternately arranged on all tracks or every other track or every other track. Are formed in such a manner as to straddle a plurality of tracks adjacent to each other along the track 24G.
- the specific area 24 is started in advance when the light spot LS1 crosses the track 24G along the arrow AR11 even when the tracking servo is open.
- a unique first SYNC pattern signal defined to indicate that the
- the specific area 24 is terminated in advance when the light spot LS1 crosses the track 24G along the arrow AR11 even when the tracking servo is open.
- a unique second SYNC pattern signal defined as indicating that the
- the specific area 24 is arranged in the guide layer 12, as will be described in detail later, when the tracking servo is pulled in at the time of recording or reproduction of the optical disk 11, the specific area 24 is aligned.
- the specific area 24 is aligned.
- the tracking servo is in the closed state, continuous error detection and track jump are possible in the specific area 24. That is, using this portion, even when the tracking servo is in the closed state, if the first SYNC pattern is normally detected, it can be recognized that the groove area is after the detection of the first SYNC pattern. It becomes possible. Further, when the second SYNC pattern is detected, it can be recognized that the data recording area starts after the end of the detection.
- the RF signal (sum signal) is detected when the first SYNC pattern is detected, so that tracking is performed on the groove or on the land.
- signals recorded in the servo area 22 and the pattern area 23 are arranged in units of slots.
- the “slot” is a logical section or section obtained by dividing the track TR in the track direction, or a physical section or section.
- the slots are typically arranged continuously without gaps in the track direction and arranged without gaps or adjacent to each other in the radial direction.
- control such as tracking servo and tilt servo is indirectly performed by the guide layer 12, the data format in the recording layer 13 can be controlled easily by having a certain relationship with the slot.
- FIG. 20 shows a specific example of preformatting in the servo area 22 and the pattern area 23 in the guide layer 12.
- the preformat configuration is configured to be used for two recording layers 13 (that is, a recording layer for the forward pass and a recording layer for the return pass). Therefore, a 3-address configuration is used for the forward path and a 3-address configuration is used for the return path. Further, a pattern area 23 for tilt detection is provided.
- one RUB is configured to correspond to a BD-R (Blue ray Disc-Recordable: Blu-ray disc that can be recorded once) format.
- BD-R Bluetooth ray Disc-Recordable: Blu-ray disc that can be recorded once
- one RUB is physically configured from (248 ⁇ (2 ⁇ 28)) physical clusters (Physical Cluster), and logically three ADIP words (ADIP word NO. 1 to NO.3).
- One ADIP word is composed of 83 ADIP units (ADIP units).
- One ADIP unit is composed of 56 wbl (wobble), which corresponds to two recording frames (Recording frame).
- Data to be recorded is a unit of 15 codewords (code word), that is, 9 nibbles (nibbles). Therefore, one RUB is a section corresponding to 13944 wobbles.
- address words included in one RUB are 74 (ie, A1 to A74) address mark subunits (servo mark subsunits), respectively. including. At the head of each servo mark word, a 30 wbl zero unit (Zero unit) is arranged.
- each servo mark subunit is composed of four slots, and the first three slots (A Slot) are assigned to servo mark slots (ie, “preformat address slots”).
- each address is composed of 70 units.
- a Reed-Solomon code is generated as follows.
- the wobble period provided in the servo area 22 is There is a relationship between the unit of 13 data formats and a predetermined integer ratio.
- the section of the pattern area 23 and the position to be arranged are also arranged so as to have a predetermined relationship with the wobble cycle. Therefore, a predetermined position of the pattern area 23 can be specified from the wobble signal detected from the mark area of the servo area 22. Therefore, the recording / reproducing apparatus described later can easily create the timing for sampling the specific parameter detection error detection.
- the preformat for recording is used.
- data such as necessary pre-addresses can be formed in a desired amount of information.
- one unit is provided with 4 slots and a buffer area D (that is, a part of the mirror surface area 21) for removing the influence of the beam diameter, the servo arranged in the adjacent track is obtained when the preformat data is acquired.
- the influence of the use area 22 and the pattern area 23 can be removed, the influence of the beam diameter of the pickup 102 can be removed, and the preformat information can be acquired stably.
- the address subunits A1 to A74 are alternately used for the forward path (that is, for the recording layer for the forward path) and for the return path (that is, for the recording layer for the backward path). Assigned.
- FIG. 21 shows a configuration example of the slot 300A (that is, “A Slot”).
- the slot 300A is composed of 9 locations. Of these, the first one location is assigned to a buffer area for avoiding the influence caused by the beam size or the like. The remaining 8 locations are allocated to physical shape (area 2) placement areas for the following purposes. That is, to generate a tracking servo sample error signal and to configure a part of the preformat address data.
- the servo area 22 is arranged in any one slot in at least one group. The arrangement conditions (including the determination of the value of m) for the slot 300A (ie, “A slot”) will be described later with reference to FIG.
- wobbles are formed in slot units as mark information.
- the sample servo marks 300S are also widely distributed in the left side of the drawing in the servo area 22 (servo area 22 also serving as the servo area) in the track direction (FIG. 9) in each track TR (Track 1 to Track 7). It is formed in slot units discretely in the middle and left and right directions and spaced by two tracks in the radial direction (vertical direction in the figure).
- slots 300A that is, “A Slot (see FIG. 11)” are arranged in such a manner that the sample servo marks 300S are widely distributed according to a predetermined rule in this way, and the pattern area 23 Inside, slots 300B (ie, “B Slot”) are arranged so as to be generally aligned in the radial direction. Before and after the pattern area 23, an overlap area 400 is secured for three wobbles.
- the length of the tilt detection signal on the track TR in the track direction and the format of the data to be recorded on the recording layer 13 are, for example, ECC block, RUB (Recording Unit Block), ADIP unit, etc.
- the length of the structural unit in the track direction may be configured to have a predetermined integer ratio. In this way, the occurrence frequency of the tilt detection signal and the period for recording data on the recording layer 13 at the recording surface position corresponding to the track TR are constant regardless of the radial position or the track position. It is easy to maintain the relationship.
- the zone CAV method when the zone CAV method is employed, stable tilt correction can be performed based on the detected tilt detection signal at an arbitrary radial position, even though the angular velocity changes depending on the radial position. Even when the zone CAV method is employed, stable tilt correction can be executed based on the detected tilt detection signal without any problem for each zone.
- a tilt detection pattern is formed in slot units as a pattern signal in the slot 300B.
- one pattern is constructed as a tilt detection pattern so as to straddle seven tracks.
- the upper half of the outer ring circumference of the light spot LS1 that is, the bright ring LS1a
- a pattern covering the lower half of the outer ring circumference of the light spot LS1 ie, the bright ring LS1a is formed at a slight distance.
- One tilt detection pattern is constructed from these two patterns.
- the determination condition of m (where m is the number of slots constituting one group) is that (1) the beam size and the track pitch for recording on the recording layer 13 can be read simultaneously.
- the servo area 22 is arranged as follows: servo area 22 that has already been arranged 1 track before (inner adjacent track), 2 tracks before (inner adjacent track before 1 track),. And at least one of “Slot 1” to “Slot m + 1” so as not to overlap in the radial direction.
- the slot 300A-1 may be adaptively arranged from the slot “Slot 1” to the slot “Slot 2” as indicated by the dotted arrow from there.
- the slot 300A-2 may be adaptively arranged from the slot “Slot 1” to the slot “Slot 3” as indicated by the dotted arrow from there.
- a predetermined specific parameter detection pattern of the pattern area 23 is formed so that a desired tilt error can be detected in the center track 23TR with 7 tracks as one group GR (see FIG. 21). . Therefore, when the center track 23TR of the pattern area 3 is followed, a predetermined specific parameter detection error at that position can be detected.
- the servo area 22 is arranged immediately before the center track TR in which the specific parameter detection error can be detected by the specific parameter detection pattern among the seven tracks TR belonging to the pattern area 23. It can be recognized that the first beam LB1 is positioned on the center track TR where the specific parameter detection error can be detected. Therefore, the sample timing for detecting the specific parameter detection error can be easily created.
- the wobble signal detected by the push-pull signal is detected with an offset. Therefore, it can be recognized that the first beam LB1 is not on the center track TR.
- the track TR of the guide layer 12 is followed by the first beam LB1.
- a continuous tracking error signal is stably generated by sampling the push-pull signal or by sampling the phase difference signal by the phase difference method (DPD).
- DPD phase difference method
- a high frequency component of a push-pull signal that is a difference from the left and right divided detectors is removed by an LPF (Low Pass Filter)
- LPF Low Pass Filter
- a wobble component and an unnecessary high frequency noise component can be removed.
- sampling the tracking error signal including the eccentric component from the inner periphery to the outer periphery, it becomes possible to obtain continuously, and it can be used as a tracking error signal when recording on the recording layer 13.
- the first 2 bits or 3 bits out of 9 bits in each slot are detected as a SYNC signal (that is, a tracking error signal can be detected). Assigned to the sync signal).
- the subsequent 3 bits are assigned to a slot number (Slot NO.), And the subsequent 2 bits are assigned to data (that is, control data, address data, etc.).
- the data values (Data) “0” to “3” are expressed as bit arrangements as shown in the lower half of the figure by the 2-bit data, respectively. Is done.
- the first one wobble (in other words, one bit) of each slot may be assigned to the mirror area 21 (see FIG. 9).
- one slot B is composed of four locations.
- the first location is a buffer area for avoiding the influence caused by the beam size or the like.
- the remaining three locations are tilt detection pattern placement areas.
- One unit is composed of k tracks.
- “k” may be determined from the beam size, the track pitch for recording on the recording layer, and the track that affects the return light amount when tilted.
- k 7.
- B slots are arranged at a predetermined ratio with respect to the slot 300A (that is, “A slot”) (for example, in this embodiment, an arrangement with a ratio of 9: 4 is used).
- FIG. 25 shows a configuration example of the slot A (combined forward / return configuration).
- the left side in the drawing of the slot 300B arranged in the pattern area 23 is the outgoing address arrangement, and the sample servo mark 300S in this area is for the outgoing path for the first layer of the recording layer 13, for example. Address.
- the right side of the slot 300B in the figure is the return path address, and the sample servo mark 300S in this area is the return path address for the second layer of the recording layer 13, for example.
- the slots or recording information used for the forward path and the return path are alternately arranged because they are shared.
- a 6-address configuration is used for 1 RUB, a 3-address configuration for the forward path, and a 3-address configuration for the return path.
- the forward address and the return address are alternately arranged as a CAV method within the zone and in a concentric or spiral shape.
- One guide layer 12 can be used for both the preformat for forward recording and the preformat for backward recording in one format.
- the recorded information track of the recording layer 13 is continuous from the inner periphery toward the outer periphery.
- the track TR of the guide layer 12 is formed at a position corresponding to the recorded information track, for example, by discretely arranged sample servo marks (see FIG. 21 and the like) so as to be formed in a spiral shape.
- the servo area 22 and the pattern area 23 are discretely formed at predetermined positions or intervals. For this reason, a specific parameter detection error can be detected anywhere on the entire surface of the optical disc 11 by a recording / reproducing apparatus described later.
- the track pitch and recording linear density (for example, linear recording density, pit pitch, or information transfer speed (that is, recording linear density ⁇ movement speed)) that can be recorded or reproduced in each recording layer 13 are set in the multilayer optical disk 11.
- the tilt correction can be performed.
- a continuous tracking error signal is stably generated by sampling the push-pull signal or by sampling the phase difference signal by the phase difference method (DPD).
- DPD phase difference method
- a high frequency component of a push-pull signal that is a difference from the left and right divided detectors is removed by an LPF (Low Pass Filter)
- LPF Low Pass Filter
- SYNC, data, etc. are allocated to the bits in each slot, and prepits are formed or not for one wobble wave.
- Partial information necessary for the preformat address configuration can be adaptively arranged in a desired slot as the sample servo mark 300S.
- This pre-pit is used to determine presence / absence, and in the optical disc 11 as in the present embodiment, no data is recorded on the guide layer 12, so it is sufficient that LPP can be detected in the initial state. For this reason, it becomes easy to detect the pre-pit signal in a recording apparatus or reproducing apparatus described in detail later.
- one slot including the servo area 22 or the sample servo mark 300S is not only the adjacent track one track before, but the servo area 22 arranged two tracks before.
- it is adaptively arranged so as not to overlap with other slots including the sample servo mark 300S. Therefore, even when the first beam LB1 (for example, a red laser) for reading the guide layer 12 is for a lower density than the second beam LB2 for the BD-R format, it is adjacent when detecting wobbles and prepits. The influence of the servo area 22 arranged on the plurality of tracks TR can be avoided. Therefore, good preformat data can be acquired.
- the first beam LB1 for example, a red laser
- the servo area 22 is an area in which the mark information is arranged.
- the mark area also serves as the “guide area” or the “servo area” according to the present invention. That is, information for tracking servo such as guide information or sample servo mark is also recorded in the servo area 22.
- the servo area 22 can also be referred to as a “servo area 22”.
- the servo area 221 is an area having both functions by arranging the mark information and the guide information in a mixed manner.
- the outward recording operation is started from the innermost circumference of the concentric track TR, and the tracking by the first light beam from the “Start” point in the figure is performed as “1 arrow”, “2 arrow”. It is assumed that this is done as "arrow”.
- the subsequent tracking by the first light beam is “9 arrows”, “10 arrows”,... Done.
- the track jump TJ is performed without any problem.
- the return path recording operation is started from the outermost periphery of the concentric track TR, and the tracking by the first light beam from the “Start” point in the figure is “1 arrow”, “2 arrow”. And so on.
- the subsequent tracking by the first light beam is slightly “9 arrows”, “10 arrows”, etc. on the inner track side. To be done.
- the forward recording operation is started from the innermost circumference of the spiral track TR, and the tracking by the first light beam is performed as “arrow 1”, “arrow 2”... Arrow “8”. Let's say. At this time, even if the track jump TJ is not performed, the tracking by the first light beam can be moved to the outside such as “9 arrows”, “10 arrows”,. In the case of recording from the inner periphery to the outer periphery in this way, no problem occurs even if the track jump TJ is not performed.
- the track jump TJ is performed, so that the reciprocal recording is performed without any problem.
- the recording / reproducing apparatus 101 is configured as a disk drive as an example of the “information recording apparatus” and the “information reproducing apparatus” according to the present invention, and is connected to the host computer 201.
- the recording / reproducing apparatus 101 includes an optical pickup 102, a signal recording / reproducing unit 103, a spindle motor 104, a bus 106, a CPU (drive control unit) 111, a memory 112, and a data input / output control unit 113.
- the first beam LB1 and the second beam LB2 are irradiated through an objective lens 102L (see FIG. 2) of the optical pickup 102.
- a tracking light beam is also transmitted through the objective lens 102L. Only the second beam LB2 serving as the same, or both the first beam LB1 and the second beam LB2 are irradiated.
- the host computer 201 includes an operation / display control unit 202, an operation button 202, a display panel 204, a bus 206, a CPU 211, a memory 212, and a data input / output control unit 213.
- data to be recorded is input from the data input / output control unit 213, and at the time of reproduction, the reproduced data is output from the data input / output control unit 213.
- the optical pickup 102 includes a red semiconductor laser that emits the first beam LB1, a blue semiconductor laser that emits the second beam LB2, and a combining / separating optical system including a prism, a mirror, and the like including the objective lens 102L.
- the optical pickup 102 is configured to irradiate the first beam LB1 and the second beam LB2 coaxially and with different focus (see FIGS. 1 and 2) via a common objective lens 102L.
- the optical pickup 102 receives the reflected light from the optical disk 11 caused by the first beam LB1 through the objective lens 102L, and a light receiving element such as a two-divided or four-divided CCD, and the second beam LB2. And a light receiving element such as a two-part or four-part CCD that receives reflected light from the optical disk 11 through the objective lens 102L.
- the optical pickup 102 is configured to be able to modulate the second beam LB2 with a relatively high recording intensity during recording and to be set to a relatively low reproducing intensity during reproduction.
- the optical pickup 102 and the signal recording / reproducing unit 103 generate a tracking error signal by, for example, a push-pull method or a phase difference method (DPD) based on a light receiving signal from a light receiving element that receives reflected light from the guide layer 12 at least during recording.
- a tracking error signal by, for example, a push-pull method or a phase difference method (DPD) based on a light receiving signal from a light receiving element that receives reflected light from the guide layer 12 at least during recording.
- DPD phase difference method
- the optical pickup 102 and the signal recording / reproducing unit 103 generate a tracking error signal by, for example, a push-pull method or a phase difference method based on a light receiving signal from a light receiving element that receives reflected light from the recording layer 13 during reproduction.
- a data signal is generated as a signal corresponding to the amount of light.
- the optical pickup 102 and the signal recording / reproducing unit 103 generate a tracking error signal based on a light receiving signal from a light receiving element that receives reflected light from the guide layer 12 during reproduction, and receive the reflected light from the recording layer 13.
- a data signal is generated by a light reception signal from the light receiving element.
- the memory 112 and the memory 212 are (i) a computer for controlling each element such as the CPU 111 in the recording / reproducing apparatus 101 and each element such as the CPU 211 in the host computer 201 so that the recording / reproducing operation described below is performed.
- Program and (ii) various data such as control data, in-process data, processed data, etc. necessary for recording / reproduction operations are used appropriately to temporarily or permanently hold data via the bus 106, bus 206, etc. It is done.
- the recording / reproducing apparatus 101 further includes a correction mechanism 105.
- the correction mechanism 105 is an example of the “processing unit” according to the present invention, and is typically a tilt correction mechanism.
- the correction mechanism 105 in addition to or in place of the tilt correction mechanism, is an eccentricity correction of the optical disk 11, a disk surface inclination correction mechanism, an optical system aberration correction mechanism, a light beam phase difference correction or distortion correction mechanism, and a light absorption correction.
- Various correction mechanisms such as a mechanism and a strategy setting mechanism may be used.
- a specific type of processing (typically tilt correction) is performed on the optical pickup 102 based on the pattern signal (typically tilt detection signal) detected from the guide layer 12 by the correction mechanism 105. For example, in the case of tilt correction, it is performed every time a tilt detection signal is detected, and the tilt servo is locked during the period until the next tilt detection signal is detected.
- the correction mechanism includes an LPF (low-pass filter) 121, a sample & hold & smoothing circuit 122, an operation (subtraction) & integration & hold circuit 123, an LPF 131, a wobble detector (132), an oscillator 133, and a sample.
- a timing generation circuit 134 is provided.
- Push-pull signals from the light receiving elements of the optical pickup 102 are input to the LPF 121 and the LPF 131, respectively, and high frequency noise is cut.
- the output signal from which the high frequency noise has been cut by the LPF 131 is subjected to wobble detection by the wobble detector (132), and is transmitted from the transmitter 133 at a frequency corresponding to the detected wobble. .
- a sample timing signal is generated by the sample timing generation circuit 134 in accordance with this transmission output.
- the sampling timing signal is a rectangular pulse for closing the sampling switch located at the center of the output pulse of the transmitter 133.
- the output signal from which the high frequency noise has been cut by the LPF 121 is sampled, held, and further smoothed by the sample & hold & smoothing circuit 122.
- the sampling timing follows the sample timing signal generated by the sample timing generation circuit 134.
- a pattern signal for example, a tilt detection signal
- the output signals which are sample 1 and sample 2 from the sample & hold & smoothing circuit 122, are subtracted, integrated and further held by the operation (subtraction) & integration & hold circuit 123.
- a specific parameter detection error signal is generated as a pattern signal forming one pattern across seven tracks or based on the pattern signal thus obtained.
- the driving operation of the correction mechanism 105 is performed according to the value of the signal or the characteristics such as positive / negative or the degree of modulation. For example, in the case of tilt correction, driving is performed so as to reduce the tilt error by an actuator for tilt correction.
- FIG. 33 shows the recording / reproducing operation in the information recording / reproducing apparatus 101
- FIG. 34 shows the details of an example of the recording operation
- FIG. 35 shows the details of the example of the reproducing operation.
- the optical disk 11 having the format according to the above-described embodiment is mounted on the recording / reproducing apparatus 101 by manual or mechanical operation by the user (step S11).
- an operation start command corresponding to an operation on the operation button 203 when the user looks at the display panel 204 is generated by the drive-side operation / display control unit 202 and the CPU 111, the host-side CPU 211, and the like.
- rotation of the optical disk 11 by the spindle motor 104 is started under the control of the signal recording / reproducing unit 103.
- light irradiation by the optical pickup 102 is started under the control of the signal recording / reproducing unit 103.
- the reading servo system for the guide layer 12 is operated. That is, the first beam LB1 is irradiated and condensed on the guide layer 12, and the tracking operation is started (step S12).
- the various commands including the operation start command and various data including user data and control data are transferred by the host side bus 206 and the data input / output control unit 213, and the drive side bus 106 and the data input / output control unit. 113.
- irradiation of the track TR with the first beam LB1 is continued on the guide layer 12, and a wobble signal and a prepit signal (a tracking error signal obtained from the at least one of them by the push-pull method or the DPD method) are generated.
- a wobble signal and a prepit signal (a tracking error signal obtained from the at least one of them by the push-pull method or the DPD method) are generated.
- a wobble signal and a prepit signal (a tracking error signal obtained from the at least one of them by the push-pull method or the DPD method) are generated.
- a wobble signal and a prepit signal a tracking error signal obtained from the at least one of them by the push-pull method or the DPD method
- the disc management information may be recorded and read together in a lead-in area, a TOC (Table Of Content) area, etc. located on the innermost circumference side in the guide layer 12.
- the content may be compliant with the disc management information of an existing DVD, BR disc or the like.
- the management information is separately recorded in advance or separately in advance in a lead-in area, a TOC area, or the like specially provided in the recording layer, and may be read at this time or at an arbitrary time.
- step S14 determines whether the requested operation is data recording.
- step S14: Yes a recording process for a new optical disc 11 is executed (step S15). This recording process will be described later in detail (see FIG. 34).
- step S16 reproduction processing for the new optical disc 11 is executed (step S17). This reproduction process will be described later in detail (see FIG. 35).
- step S16 If it is determined in step S16 that the data is not reproduced (step S16: No), or if the reproduction process for the new optical disc 11 is completed in step S17, the operation button 203 indicates that the eject, that is, the ejection of the tray is performed. It is determined whether or not the request is made through the process (step S18). Here, if the ejection is not requested (step S18: No), the process returns to step S14, and the subsequent steps are executed again.
- step S18 determines whether the ejection is requested in the determination in step S18 (step S18: No). If the ejection is requested in the determination in step S18 (step S18: No), the ejection operation is executed (step S19), and a series of recording / reproducing processes on the optical disc 11 is completed.
- the second beam LB2 having the optical system such as the objective lens 102L in the optical pickup 102 in common with the first beam LB1 is also recorded on the recording layer 13. It is moved to a planar position in the recording surface corresponding to the address (step S21a).
- the zone of the zone CAV type optical disc 11 is determined, and the spindle servo control is performed according to the determined zone to obtain a rotation speed suitable for the zone (step S21b).
- the focus servo of the second beam LB2 is applied to the desired recording layer 13 on which data is to be recorded by the optical pickup 102 (step S22).
- the tracking servo for the track TR by the first beam LB1 is continued in a state where the focus servo of the second beam LB2 is closed by the optical pickup 102. That is, the tracking servo for the desired recording layer 13 is indirectly performed by the tracking servo for the guide layer 12 (step S23a).
- correction is performed by the correction mechanism 105 based on the specific parameter detection result (see FIGS. 31 and 32).
- This correction is performed intermittently or periodically or irregularly according to detection of a pattern signal such as a tilt detection signal.
- tilt correction is performed according to the tilt error signal, and after correction, the tilt servo is locked and the next opportunity for correction is waited (step S23b).
- the correction in step S23b may be performed at least partially during the data recording process in the next step S23c.
- step S23c data recording on the desired recording layer 13 is started by irradiating the second beam LB2 while modulating it in accordance with the data value to be recorded.
- step S201 it is determined by the CPU 111 or the like whether or not it is the track switching position (step S201).
- step S201 when it is the track switching position (step S201: Yes), a track jump is performed (step S202).
- step S203 whether or not the optical pickup 102 is at the zone switching position is determined by the CPU 111 or the like. If it is the zone switching position (step S203: Yes), spindle servo control is performed so that the rotation speed corresponds to the new zone, and the rotation speed suitable for the zone is set (step S204).
- step S204 After step S204 or when it is not the zone switching position in the determination in step S203 (step S203: No), or when it is not the track switching position in the determination in step S201 (step S201: No), data recording to the recording layer 13 is performed. Is continued (step S205).
- step S24 it is monitored by the CPU 111 or the like whether or not a predetermined amount of recording has been completed.
- the data recording to the recording layer 13 is continued (step S24: No).
- the management information is updated according to the recorded data (step S25).
- the management information may be recorded together in a lead-in area, a TOC area, or the like provided in at least one of the plurality of recording layers 13.
- the position may be on the inner peripheral side, but may be on the outer peripheral side or in the middle, or may be recorded in a somewhat dispersed form.
- the management information provided in the memory 112, the memory 212, and the like and associated with the optical disc 11 may be updated.
- This example is an example in which the first beam LB is used for tracking or the like not only during the recording process but also during the reproduction process.
- the focus servo of the first beam LB1 is applied to the guide layer 12 by the optical pickup 102 under the control of the CPU 111 and the signal recording / reproducing unit 103.
- a tracking servo is applied to the track TR by one beam LB1.
- the CPU 111 and the like obtain address information from wobbles and prepits on the track TR.
- the CPU 211 or the like searches for a desired reproduction address designated as an address at which data reproduction should be started. That is, the first beam LB1 is moved to the address position.
- the second beam LB2 having the optical system such as the objective lens 102L in the optical pickup 102 in common with the first beam LB1 (see FIGS. 1 and 2) is also recorded on the recording layer 13. It is moved to a plane position in the recording surface corresponding to the address (step S41).
- the focus servo of the second beam LB2 is applied to the desired recording layer 13 from which data is to be reproduced by the optical pickup 102 under the control of the CPU 111 and the signal recording / reproducing unit 103 with the tracking servo applied. (Step S43).
- the tracking servo is closed by the first beam LB1 and the focus servo is closed by the second beam LB2, and the reflected light caused by the second beam LB2 is reflected on the objective lens.
- reproduction of data from the desired recording layer 13 is started (step S43).
- step S44 it is monitored by the CPU 111 and the like whether or not the predetermined amount of reproduction has been completed.
- the reproduction of data from the recording layer 13 is continued unless the reproduction ends (step S43: No).
- step S44 Yes
- step S17 in FIG. 33 a series of reproduction processes for the new optical disc 11
- the first beam LB is not used during the reproduction process due to tracking or the like. That is, in the case of this modification, unlike the recording process, the second beam LB2 is also used for tracking.
- the tracking servo is in an open state.
- Step S141: NO it is monitored whether or not the first SYNC signal “SYNC1” from the first SYNC pattern area 24-1 (see FIG. 10, etc.) is detected.
- Step S141: YES the servo pull-in operation is started (Step S142).
- a pattern in the main body region 24-2 (see FIG. 10 and the like) is detected, and a zero cross signal having sufficient amplitude is obtained.
- step S143 it is monitored whether or not the pull-in to the tracking servo is completed.
- step S143 While the pull-in is not completed (step S143: NO), it is monitored whether or not the second SYNC signal “SYNC2” from the second SYNC pattern area 24-3 (see FIG. 10, etc.) is detected (step S143).
- step S144 Here, when the second SYNC signal is detected (step S144: YES), the specific area 24 in the current round is over (see FIGS. 11 to 13), so that the servo pull-in operation is temporarily performed. The process is canceled and the process returns to step S141 again. That is, the use of the specific area 24 in the next round is attempted. Alternatively, it is possible to switch to a possible pull-in operation in the servo area 22.
- the servo pull-in operation using the specific area 24 can be forcibly terminated and other options can be executed without delay, including re-execution with a lap delay.
- step S144 NO
- the process returns to step S142 and the servo pull-in operation is continued.
- step S143 If the determination in step S143 confirms that the pull-in has been completed (step S143: YES), it is determined that the pull-in has been successfully completed, and the series of processing related to the tracking servo pull-in is completed. As a result, the tracking servo for the target track is closed, and the subsequent tracking operation during recording and reproduction is continued.
- the tracking servo is in a servo closed state.
- step S51: NO If detected (step S51: YES), the tracking servo is held (step S52).
- an RF signal (sum signal) corresponding to a pattern in the first SYNC pattern area 24-2 to the main body area 24-2 (see FIG. 10 and the like) is determined (step S53), and “soon to be a groove” is determined. (Step S54) or "Land soon” is determined (Step S64).
- step S54 when it is determined that “groove is soon” (step S54), groove tracking is turned on (step S55), and a half track jump is started (step S56).
- step S57 When the zero cross is confirmed (step S57: YES), the half track jump is finished and the land tracking is turned on (step S58).
- step S64 when it is determined that “land is about to come” (step S64), land tracking is turned on (step S65), and a half track jump is started (step S66).
- step S67 When the zero cross is confirmed (step S67: YES), the half track jump is finished and the groove tracking is turned on (step S68).
- tracking servo pull-in and track jump can be appropriately executed during information recording and reproduction.
- the ECC array of data recorded on the recording layer 13 is recorded from the inner periphery to the outer periphery or from the outer periphery to the inner periphery by providing a specific area 24 immediately before the portion aligned in the radial direction. In any case, it is possible to recognize the specific area 24 and obtain the timing for performing the track jump.
- the main body portion of the specific area 24 employs an alternating pattern of grooves and lands, it can easily jump to an adjacent track anywhere.
- the specific area 24 is started when the tracking servo is in the open state and the retraction is performed. Can be detected.
- the subsequent pattern of the alternating configuration of the grooves and lands arranged in the main body region 24-2 more preferably by providing a distance between the grooves, a signal crossing the track can be reliably obtained, The servo can be easily pulled in.
- a unique pattern that can be detected even when the tracking servo is open is placed in the second SYNC pattern area 24-3, so that the end position of the specific area 24 can be recognized even when the tracking servo is not retracted. Thereafter, the servo pull-in method can be changed according to the area.
- the pattern area is arranged with a plurality of tracks as one group GR, it is possible to freely arrange within the collected tracks, and specific parameters such as a tilt error detection point that can be detected by the recording / reproducing apparatus 101.
- the degree of freedom of arrangement of detection points can be secured. Since one pattern area 23 and another adjacent pattern area 23 are independent, it is possible to arrange a specific parameter detection pattern such as a tilt detection pattern independently of each other. However, a flexible arrangement is possible.
- the pattern region 3 is arranged with the plurality of tracks TR that are simultaneously read as one group GR.
- the arrangement of is easy to read and can realize an extremely convenient arrangement.
- the recording / reproducing apparatus 101 can grasp the exact position of the pattern area 23 from the wobble signal detected in the servo area 22 ( 31 and 32), the detected error signal sample timing can be easily generated.
- the wobble period of the servo area 22 and the section of the pattern area 23 have a predetermined integer ratio (see FIG. 8), the sample timing can be easily generated.
- the arrangement interval or the longest arrangement interval of the servo regions 22 discretely arranged along the track direction where the tracking servo can operate in a predetermined frequency band A method for determining (an example of the “predetermined distance” according to the present invention) will be described together with a tracking servo system.
- the tracking servo system includes an error detector 301 including a subtractor, a sampler 302 including a sampling switch, a capacitor, and a buffer, an amplifier and an equalizer 303. And an actuator 304.
- the disturbance for tracking servo is input to the error detector 301, and the feedback signal from the actuator 304 is subtracted (minus addition) and output as a subtraction signal.
- the subtraction signal from the error detector 301 is input to the sampler 302.
- the sampler 302 is configured as a so-called “zero-order hold circuit” that holds sample values. Specifically, a sampling switch that closes at a sampling timing, a capacitor that holds the sampling switch, and a buffer are provided. The subtracter signal is sampled by the sampler 302 at the sampling timing corresponding to the frequency band for operating the tracking servo by the sampling switch, further held by the capacitor, and buffered by the buffer.
- the sampling timing is generated by a mark signal such as a wobble signal and a prepit signal detected by a light receiving element that receives the first beam LB1.
- the method of generating the sampling timing is not limited to this, and may be generated according to the medium configuration such as a modified example described later. Further, the configuration of the sampler 302 is not limited to this, and needless to say, a “primary hold circuit” or the like may be used.
- the buffer output from the sampler 302 sampled in this way is amplified and equalized by the amplifier and the equalizer 303, and further input to the actuator 304.
- the irradiation position of the first beam LB1 on the guide layer 12 provided in the optical pickup 102 by the actuator 304 (accordingly, the irradiation position of the second beam LB2 on the recording layer 13). ) Is moved in the radial direction. A feedback signal corresponding to the fluctuation is fed back from the actuator 304 to the error detector 301.
- sampling timing in the sampler 302 will be examined with reference to FIGS.
- FIG. 39 schematically shows the operation output of the sampler 302 when the eccentric component that is the maximum disturbance element input to the error detector 301 changes. From FIG. 39, it can be seen that the tracking error undulates from the plus side to the minus side with a substantially constant period with respect to time.
- FIG. 40 shows a Bode diagram (Bode ⁇ ⁇ Plot of zero-order hold) of the transfer function when “zero-order hold” is performed by the sampler 302.
- the frequency characteristic of the zero hold is shown, and in particular, the gain characteristic (upper characteristic curve) and phase (lower characteristic curve) are shown superimposed in the Bode diagram.
- the gain characteristic upper characteristic curve
- phase lower characteristic curve
- FIG. 40 shows that when the phase characteristic is sampled at 1 KHz, the signal at 100 Hz rotates about several degrees as shown by the characteristic curve portion 1001 in the phase. On the other hand, if the bandwidth around the phase is negligible, 100 Hz, a sample interval of about 10 times (1 KHz) or more is necessary (that is, sampling at a frequency higher than 1 KHz is necessary).
- FIG. 41 shows an example of the disk disturbance characteristic and the tracking servo open loop characteristic for the tracking servo.
- the “disturbance characteristics of the disc that is, the optical disc 11)” has an eccentric component of 35 ⁇ m on one side up to a frequency of 23.1 Hz, and is 1.1 m / S 2 in the acceleration region. That is, the disturbance of the disk is approximately flat at 64 db corresponding to 35 ⁇ m in the characteristic diagram up to a frequency of 23.1 Hz, and 1.1 m from 0 dB corresponding to 0.022 ⁇ m on the higher frequency side. / S 2 slope down.
- the “predetermined distance” is determined as follows.
- the arrangement interval or arrangement pitch (see FIG. 9) of the two servo regions 22 arranged in a discrete manner in the track direction.
- An example of the longest required distance, that is, a “predetermined distance” according to the present invention is determined.
- the method for determining the arrangement interval (that is, the arrangement pitch) of the servo areas 22 is not limited to this example, and a required servo band as shown in FIGS. What is necessary is just to determine in consideration of the linear velocity etc. in a CAV system. ⁇ Various modifications> Hereinafter, various modifications of the embodiment will be described with reference to FIGS.
- FIG. 42 shows a modification of the specific area 24 of the optical disc 11 in the above-described embodiment.
- FIG. 42 is a schematic perspective view having the same concept as in FIG. 10 of the specific region 24 of the present modification.
- this modification employs a configuration in which a land area is formed between the first SYNC pattern area 24-1 and the second SYNC pattern area 24-3. Further, a configuration is adopted in which a groove area (part 2001 in the figure) is provided in a track where the first SYNC pattern area 24-1 and the second SYNC pattern area 24-3 do not exist.
- the subsequent area is a trap of the land area. Therefore, in order to apply the tracking servo on the land, the polarity of the tracking servo may be reversed as compared with the case of the above-described embodiment (see FIG. 10).
- the polarity of the tracking servo may be reversed as compared with the case of the above-described embodiment (see FIG. 10).
- a track crossing signal can be detected as in the above-described embodiment (see FIG. 10).
- this modification can basically provide the same effects as those of the above-described embodiment (see FIG. 10).
- FIG. 43 shows a modification of the specific area 24 of the optical disc 11 in the above-described embodiment.
- FIG. 43 is a schematic perspective view having the same concept as in FIG. 10 of the specific region 24 of the present modification.
- FIG. 44 is a schematic diagram showing the state of the track jump executed in the present modification with bold arrows.
- FIG. 45 is a schematic characteristic diagram showing tracking error signals in three cross sections (A cross section, B cross section, and C cross section) corresponding thereto.
- this modification is an example in which the beam size, that is, the diameter of the light spot LS1 is left as it is, for example, the data recorded on the recording layer 13 is densified and the track pitch is narrowed.
- first SYNC pattern area 24-1, main body area 24-2, second SYNC pattern area 24-3 ⁇ are arranged every three tracks, and a Land configuration is formed between them.
- first SYNC pattern area 24-1, main body area 24-2, second SYNC pattern area 24-3 ⁇ are sequentially arranged so as not to overlap each other in the adjacent three tracks, as indicated by an arrow 2002. ing.
- the track jump to the desired track is the case on the current track “Track 4”.
- the kick addition and the tracing operation are performed in the “groove area (2)” as shown by the bold arrow in the center.
- the kick addition and the tracing operation are executed in the “groove area (3)” as indicated by the bold arrow on the right side.
- the kick addition and jump operations are executed in the “groove area (1)” as shown by the bold arrow on the left side.
- tracking error signals having appropriate amplitudes are obtained in the A cross section, the B cross section, and the C cross section. It is feasible.
- the track crossing signal can be detected and the pull-in operation becomes easy, so that the object can be achieved.
- the track that can be actually closed is slightly more restricted than the embodiment, but there is no problem in practice.
- this modification can basically provide the same effects as those of the above-described embodiment (see FIG. 10).
- an area that can easily jump to a desired track can be secured.
- FIG. 46 shows a modification of the specific area 24 of the optical disc 11 in the above-described embodiment.
- FIG. 42 is a schematic perspective view having the same concept as in FIG. 10 of the specific region 24 of the present modification.
- the present modification is an example in which the first SYNC pattern area 24-1 and the second SYNC pattern area 24-3 are provided in the same phase on all tracks.
- the S / N Signal to be used when detecting the first SYNC pattern and the second SYNC pattern is obtained.
- the advantage is that the (Noise) ratio is improved.
- it is impossible to identify whether the track being followed is a groove or a land after the first SYNC pattern area 24-1.
- FIG. 47 shows a modification of the basic layer configuration (see FIGS. 1 and 2) of the optical disc 11 in the above-described embodiment.
- FIG. 47 is a schematic perspective view having the same concept as in FIG. 1 of the optical disk of the present modification.
- two guide layers 12a and 12b are provided.
- the first address information indicating the address position from the inner circumference to the outer circumference is carried on the track TR-a of the guide layer 12a.
- the track TR-b of the guide layer 12b carries the second address information indicating the address position from the outer periphery toward the inner periphery.
- the recording layer 13 is also divided into a first recording layer that is recorded in accordance with the first address information and a second recording layer that is recorded in accordance with the second address information.
- the layer 12a is used to guide the second recording layer using the guide layer 12b.
- the recording / reproduction is performed between these two layers. Since the time required for switching is substantially the time required for performing the interlayer jump, it is extremely advantageous when recording / reproducing is performed continuously over a plurality of recording layers. In other words, the same effect as the so-called “Opposite recording” or “Opposite reproduction” in the dual-layer disc can be obtained. That is, as data to be recorded, continuous data such as video data in real time is recorded using the optical disc 11 of the present modified example, and at the time of reproduction, particularly from the end of the first recording layer to the second recording layer.
- the arrangement interval (arrangement pitch) of the servo areas 22 along the track TR is set to a predetermined distance or less, and the servo area is further formed on the entire surface of the optical disc 11. Since 22 are (discretely) arranged, a continuous tracking signal can be obtained by sampling at any position from the inner circumference to the outer circumference of the optical disc 11 of the guide layer 12.
- the unit of the data format in the recording layer 13 and one cycle of the wobble WB are in an integer multiple relationship, and a slot is configured as an integer multiple of one cycle of the wobble WB, and the servo area 22 is made to correspond to this section. Therefore, the adaptive arrangement is facilitated so that the servo areas 22 in the adjacent tracks TR do not overlap (that is, no crosstalk occurs in the wobble signal or prepit signal).
- the wobble signal obtained in this way can be used as a timing reference signal generation excellent in robustness or a timing signal generation at the start of recording via a PLL (Phase Locked Loop) circuit.
- the present invention can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification, and an information recording medium, an information recording apparatus and a method, and the like accompanying such a change, and An information reproducing apparatus and method are also included in the technical idea of the present invention.
Abstract
Description
本発明のこのような作用及び利得は次に説明する実施の形態から明らかにされる。
(情報記録媒体)
<1>
本実施形態の情報記録媒体は上記課題を解決するために、予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている。
ここで、光ピックアップ等における、第1及び第2光ビームを照射する光学系が固定されていれば、それらにより形成される光スポットの位置関係も固定されている。このため、第1光ビームの位置(即ち、それにより形成されるトラック上の光スポットの位置)についてトラッキングサーボ等のガイド動作を実行することは、第2光ビーム(即ち、それにより形成される記録面内における光スポットの位置)についても、再現性を持ってガイド動作を行っていることになる。言い換えれば、予め存在するトラック上における第1光ビームを利用して、予めトラックが存在しない記録面内における第2光ビームを、トラッキング或いはガイド可能となる。
<2>
本実施形態の情報記録媒体の一態様では、前記所定パターンは、グルーブ及びランドが所定ルールで組み合わせられることで、前記ガイド層に物理的に夫々造り込まれている。
<3>
このグルーブ及びランドの組み合わせに係る態様では、前記所定パターンは、ウォブル及びプリピット構造、並びにウォブル及び一部切欠き構造のうち少なくとも一方を夫々有する。
<4>
上述のグルーブ及びランドの組み合わせに係る態様では、前記所定パターンは、前記トラック方向に沿って配列された、(i)第1のSYNCパターン、(ii)前記グルーブ及び前記ランドの前記所定ルールによる組み合わせを有する本体部、並びに(iii)前記第1のSYNCパターンと異なる第2のSYNCパターンを含んでもよい。
<5>
この場合更に、前記第1のSYNCパターンは、その検出に対応して前記本体部の存在を検知可能となるように規定されており、前記第2のSYNCパターンは、その検出に対応して前記本体部の終了を検知可能となるように規定されてもよい。
<6>
本実施形態の情報記録媒体の他の態様では、当該情報記録媒体は、ゾーンCAV方式であり、前記トラックは、同心円状又は螺旋状である。
本実施形態の情報記録媒体の他の態様では、前記複数の特定領域は、前記複数の記録層に夫々記録されるデータのECCの並びが前記径方向に揃う部分の直前に対応する位置に夫々配置されている。
<8>
本実施形態の情報記録媒体の他の態様では、前記ガイド情報は、前記トラック方向に沿って内周から外周へ向う第1記録用アドレス情報及び前記外周から前記内周へ向う第2記録用アドレス情報のうち少なくとも一方を含む。
<9>
本実施形態の情報記録媒体の他の態様では、前記トラックは、トラッキングサーボ用のガイドトラックであり、前記物理構造は、前記ガイド情報の少なくとも一部を構成する前記トラッキングサーボ用の信号を、発生可能であり、前記複数のガイド領域は夫々、前記トラッキングサーボ用の信号を発生するためのサーボ用領域であり、前記所定距離は、前記トラッキングサーボが所定の帯域で動作可能な距離に予め設定されており、前記複数のサーボ用領域は、前記トラッキングサーボ用の光ビームの径に基づいて、前記光ビームが同時に照射されないように前記複数のトラック間でずらされて、配置されている。
<信号検出用領域に関する実施形態>
本実施形態で好ましくは、前記トラックには更に、前記トラックに交わる径方向に相隣接する複数のトラック部分のうち少なくとも前記径方向の中央寄りに位置するセンタートラック部分にて特定種類のパターン信号が検出可能なように、前記複数のトラック部分に跨る一まとまりの所定パターンを夫々有する複数の信号検出用領域が、配置されている。
<スロットに関連する実施形態>
本実施形態で好ましくは、複数のガイド領域は、複数のスロットのうち、トラック方向に相隣接しておらず且つ径方向に複数のトラックに渡って相隣接していない一部の複数のスロット内に、配置されている。典型的には、このような一部の複数のスロット内に一つずつ配置されている。
(情報記録装置)
<10>
本実施形態の第1の情報記録装置は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)に、データを記録する情報記録装置であって、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御手段と、前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御手段と、前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ手段と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御手段とを備える。
<11>
本実施形態の第2の情報記録装置は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)に、データを記録する情報記録装置であって、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御手段と、前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御手段とを備える。
(情報記録方法)
<12>
本実施形態の第1の情報記録方法は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)に、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを記録する情報記録方法であって、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御工程と、前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御工程と、前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ工程と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御工程とを備える。
<13>
本実施形態の第2の情報記録方法は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)に、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを記録する情報記録方法であって、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御工程と、前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御工程とを備える。
(情報再生装置)
<14>
本実施形態の第1の情報再生装置は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)から、データを再生する情報再生装置であって、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御手段と、前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御手段と、前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ手段と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得手段とを備える。
<15>
本実施形態の第2の情報再生装置は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)から、から、データを再生する情報再生装置であって、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御手段と、前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得手段とを備える。
(情報再生方法)
<16>
本実施形態の第1の情報再生方法は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)から、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを再生する情報再生方法であって、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御工程と、前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御工程と、前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ工程と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得工程とを備える。
<17>
本実施形態の第2の情報再生方法は上記課題を解決するために、上述した実施形態の情報記録媒体(但し、その各種態様を含む)から、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを再生する情報再生方法であって、前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御工程と、前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得工程とを備える
本実施形態の第2の情報再生方法によれば、上述した実施形態の第2の情報再生装置の場合と同様に作用し、トラックジャンプを適宜に実行しつつ、公的に最終的には、上述した実施形態の情報記録媒体における記録層から好適に、例えばコンテンツ情報、ユーザ情報等の記録済情報を、高密度にて再生可能となる。
<情報記録媒体の実施例>
初めに、図1から図29を参照して、本発明に係る情報記録媒体の一例である多層記録型の光ディスクの実施例について説明する。
次に、図20~図25を参照して、ガイド層12におけるサーボ用領域22及びパターン領域23(図9参照)の具体的なデータ構成について詳細に説明する。
ここで、αは、原始元
Gp(x)=X8+X4+X3+X2+1
このように1RUB単位での構成例によれば、他の記録層13への記録データフォーマットが、例えばBD-Rフォーマット準拠であるとした場合、サーボ用領域22に設けるウォブルの周期は、記録層13のデータフォーマットの構成単位と所定の整数比の関係にある。パターン領域23の区間及び配置する位置も、ウォブルの周期と所定の関係になるように配置されている。このため、サーボ用領域22の目印領域から検出したウォブル信号から、パターン領域23の所定の位置を特定できる。よって、後述の記録再生装置が、特定パラメータ検出エラー検出をサンプルするタイミングを容易に作成することができる。
例えば、mの値は、所定の条件から決定される。サーボ用領域22は、少なくとも1グループ内の何れかの1つのスロットに配置される。スロット300A(即ち「A スロット」)についての配置条件(mの値決めを含む)については、後に、図22を参照して、説明する。
ECC構成を、前述したように構成すれば、往路用、復路用別々に構成することができる。
<情報記録再生装置及び方法の実施例>
次に、図30から図35を参照して、本発明に係る情報記録再生装置及び方法の実施例について説明する。
他方、ステップS14の判定にてデータ記録でない場合(ステップS14:No)、又はステップS15にて新規なる光ディスク11に対する記録処理が完了された場合、ドライブ側のCPU111又はホスト側のCPU211等により、要求されている動作が、データ再生であるか否かが判定される(ステップS16)。ここで、データ再生である場合(ステップS16:Yes)、新規なる光ディスク11に対する再生処理が実行される(ステップS17)。この再生処理については、後に詳述する(図35参照)。
<各種変形例>
以下、実施例の各種変形例について図42から図47を参照して説明する。
12 ガイド層
13 記録層
21 鏡面領域
22 サーボ用領域(目印領域)
23 パターン領域
24 特定領域
24-1 第1SYNCパターン領域
24-2 本体部領域
24-3 第2SYNCパターン領域
TR トラック
WB ウォブル
LLP1 ランドプリピット
LB1 第1ビーム
LB2 第2ビーム
102 光ピックアップ
102L 対物レンズ
101 記録再生装置
201 ホストコンピュータ
Claims (17)
- 予め同心円状又は螺旋状のトラックが形成されたガイド層と、
該ガイド層上に積層された複数の記録層と
を備え、
前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている
ことを特徴とする情報記録媒体。 - 前記所定パターンは、グルーブ及びランドが所定ルールで組み合わせられることで、前記ガイド層に物理的に夫々造り込まれていることを特徴とする請求項1に記載の情報記録媒体。
- 前記所定パターンは、ウォブル及びプリピット構造、並びにウォブル及び一部切欠き構造のうち少なくとも一方を夫々有することを特徴とする請求項2に記載の情報記録媒体。
- 前記所定パターンは、前記トラック方向に沿って配列された、(i)第1のSYNCパターン、(ii)前記グルーブ及び前記ランドの前記所定ルールによる組み合わせを有する本体部、並びに(iii)前記第1のSYNCパターンと異なる第2のSYNCパターンを含む
ことを特徴とする請求項2に記載の情報記録媒体。 - 前記第1のSYNCパターンは、その検出に対応して前記本体部の存在を検知可能となるように規定されており、
前記第2のSYNCパターンは、その検出に対応して前記本体部の終了を検知可能となるように規定されている
ことを特徴とする請求項4に記載の情報記録媒体。 - 当該情報記録媒体は、ゾーンCAV方式であり、
前記トラックは、同心円状又は螺旋状である
ことを特徴とする請求項1に記載の情報記録媒体。 - 前記複数の特定領域は、前記複数の記録層に夫々記録されるデータのECCの並びが前記径方向に揃う部分の直前に対応する位置に夫々配置されていることを特徴とする請求項1に記載の情報記録媒体。
- 前記ガイド情報は、前記トラック方向に沿って内周から外周へ向う第1記録用アドレス情報及び前記外周から前記内周へ向う第2記録用アドレス情報のうち少なくとも一方を含むことを特徴とする請求項1に記載の情報記録媒体。
- 前記トラックは、トラッキングサーボ用のガイドトラックであり、
前記物理構造は、前記ガイド情報の少なくとも一部を構成する前記トラッキングサーボ用の信号を、発生可能であり、
前記複数のガイド領域は夫々、前記トラッキングサーボ用の信号を発生するためのサーボ用領域であり、
前記所定距離は、前記トラッキングサーボが所定の帯域で動作可能な距離に予め設定されており、
前記複数のサーボ用領域は、前記トラッキングサーボ用の光ビームの径に基づいて、前記光ビームが同時に照射されないように前記複数のトラック間でずらされて、配置されている
ことを特徴とする請求項1に記載の情報記録媒体。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体に、データを記録する情報記録装置であって、
前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、
前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御手段と、
前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御手段と、
前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ手段と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御手段と
を備えることを特徴とする情報記録装置。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体に、データを記録する情報記録装置であって、
前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御手段と、
前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御手段と
を備えることを特徴とする情報記録装置。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体に、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを記録する情報記録方法であって、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、
前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御工程と、
前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御工程と、
前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ工程と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御工程と
を備えることを特徴とする情報記録方法。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体に、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを記録する情報記録方法であって、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御工程と、
前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層に前記第2光ビームを照射し且つ集光することで、前記データを記録するように前記光照射手段を制御するデータ記録制御工程と
を備えることを特徴とする情報記録方法。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体から、データを再生する情報再生装置であって、
前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、
前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御手段と、
前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御手段と、
前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ手段と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得手段と
を備えることを特徴とする情報再生装置。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体から、データを再生する情報再生装置であって、
前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段と、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得手段と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御手段と、
前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得手段と
を備えることを特徴とする情報再生装置。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体から、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを再生する情報再生方法であって、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、
前記トラッキングサーボが前記オープンの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラッキングサーボの引き込み動作の開始又は継続を制御する第1引込制御工程と、
前記トラッキングサーボが前記オープンの状態又は引き込み途中の状態で、前記複数の特定領域において前記検出された所定パターンの他種類に基づき、前記引き込み動作の継続又は停止を制御する第2引込制御工程と、
前記取得されたガイド情報に基づき前記複数のトラックのうち所望のトラックに対して前記トラッキングサーボをかけるように前記光照射手段を制御するトラッキングサーボ工程と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得工程と
を備えることを特徴とする情報再生方法。 - 予め同心円状又は螺旋状のトラックが形成されたガイド層と、該ガイド層上に積層された複数の記録層とを備え、前記トラックには、(i)ガイド用のガイド情報を担持する物理構造を夫々有する複数のガイド領域が、前記トラックに沿ったトラック方向に予め設定された所定距離以下の配置間隔にて離散的に、且つ前記トラックに交わる径方向に相隣接する複数のトラックに渡って該複数のトラック間でずらされて、配置されていると共に、(ii)所定パターンを夫々有する複数の特定領域が、トラッキングサーボがオープンの状態で前記所定パターンが検出可能なように、前記径方向において内周から外周に渡って同一位相に夫々配置されている情報記録媒体から、前記ガイド層にトラッキング用の第1光ビームを照射し且つ集光することが可能であると共に前記複数の記録層のうち一の記録層にデータ記録用の第2光ビームを照射し且つ集光することが可能である光照射手段を用いて、データを再生する情報再生方法であって、
前記ガイド層からの前記照射され且つ集光された第1光ビームに基づく第1光を受光し、該受光された第1光に基づき前記所定パターンを検出すると共に前記担持されたガイド情報を取得する情報取得工程と、
前記トラッキングサーボがかけられているサーボクローズの状態で、前記複数の特定領域において前記検出された所定パターンの一種類に基づき、前記トラックに係るトラックジャンプを制御するジャンプ制御工程と、
前記トラックジャンプをした場合に、前記取得されたガイド情報に基づき、前記複数のトラックにおける所望の位置を検索し、前記サーボクローズの状態で、前記一の記録層からの前記照射され且つ集光された第2光ビームに基づく第2光を受光し、該受光された第2光に基づき前記データを取得するデータ取得工程と
を備えることを特徴とする情報再生方法。
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WO2011128985A1 true WO2011128985A1 (ja) | 2011-10-20 |
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PCT/JP2010/056625 WO2011128985A1 (ja) | 2010-04-13 | 2010-04-13 | 情報記録媒体、情報記録装置及び方法、並びに情報再生装置及び方法 |
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US (1) | US20130201806A1 (ja) |
JP (1) | JPWO2011128985A1 (ja) |
WO (1) | WO2011128985A1 (ja) |
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US9607624B2 (en) * | 2013-03-29 | 2017-03-28 | Apple Inc. | Metadata driven dynamic range control |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000132850A (ja) * | 1998-10-23 | 2000-05-12 | Pioneer Electronic Corp | 記録情報再生装置 |
JP2004213822A (ja) * | 2003-01-08 | 2004-07-29 | Sony Corp | 光ディスクおよび光ディスク装置 |
JP2005203070A (ja) * | 2003-12-15 | 2005-07-28 | Pioneer Electronic Corp | 記録媒体並びに記録再生方法及び記録再生装置 |
-
2010
- 2010-04-13 JP JP2012510499A patent/JPWO2011128985A1/ja active Pending
- 2010-04-13 WO PCT/JP2010/056625 patent/WO2011128985A1/ja active Application Filing
- 2010-04-13 US US13/640,593 patent/US20130201806A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000132850A (ja) * | 1998-10-23 | 2000-05-12 | Pioneer Electronic Corp | 記録情報再生装置 |
JP2004213822A (ja) * | 2003-01-08 | 2004-07-29 | Sony Corp | 光ディスクおよび光ディスク装置 |
JP2005203070A (ja) * | 2003-12-15 | 2005-07-28 | Pioneer Electronic Corp | 記録媒体並びに記録再生方法及び記録再生装置 |
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US20130201806A1 (en) | 2013-08-08 |
JPWO2011128985A1 (ja) | 2013-07-11 |
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