JP2006092732A - Recording disk and recording-information reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording disk and a recording-information reproducing device which can quickly start reproducing operation, when information data is reproduced with respect to a recording disk, by adopting the tracking control by a push pull method. <P>SOLUTION: Identification information indicating the polarity of push pull reading signals is preliminarily recorded on a BCA (burst cutting area). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a recording disk and a recorded information reproducing apparatus for reproducing recorded information from the recording disk.

  Currently, a DVD-ROM is widely used as a read-only optical recording medium in which information data such as audio, video, and computer data is recorded in advance. The DVD-ROM has a two-layer recording surface composed of, for example, a first recording layer and a second recording layer. When the first recording layer is viewed from the upper surface, which is the irradiation side of the reading beam in such a DVD-ROM, recording pit rows carrying information data are formed on a spiral or concentric track. Further, when the second recording layer is viewed from the lower surface of the DVD-ROM, a recording pit row for carrying information data is formed on a spiral or concentric track. That is, when the first and second recording layers are viewed from the upper surface of the DVD-ROM, each of the recording pits formed in the first recording layer is convex, but is formed in the second recording layer. Each recording pit is concave. Therefore, hereinafter, the recording pit recorded in the first recording layer is referred to as a convex recording pit, and the recording pit recorded in the second recording layer is referred to as a concave recording pit.

  In a conventional reproducing apparatus that reproduces recorded information from such a DVD-ROM, tracking servo by a DPD (Differential Phase Detection) method is performed. In tracking control by the DPD method, reflected light when a recording disk is irradiated with beam light is individually received and photoelectrically converted by four photodetectors 20a to 20d arranged in the form shown in FIG. The obtained read signals Ra to Rd are used. Then, a high-frequency signal and a diagonal difference signal are obtained by the following calculation using these read signals Ra to Rd, and tracking control is performed using the phase difference between them as an error signal.

High frequency signal = Ra + Rb + Rc + Rd
Diagonal difference signal = (Ra + Rc) − (Rb + Rd)
By adopting such a DPD method, good tracking control is performed for both the first recording layer in which convex recording pits are recorded and the second recording layer in which concave recording pits are recorded. The

  On the other hand, in a writable recording disk such as a DVD-R or DVD-RW, a recording track having a wobble form corresponding to a disk address indicating a position on the disk is formed in advance. In a recorded information reproducing apparatus for recording and reproducing information data on such a DVD-R or DVD-RW, information is recognized while recognizing the position on the disk by reading the wobble form of the recording track formed on the recording disk. Record data. At this time, a push-pull signal is used to read the wobble form of the recording track. The push-pull signal is obtained by the following calculation using the read signals Ra to Rd obtained by photoelectrically receiving and individually receiving light by the four photodetectors 20a to 20d as shown in FIG.

Push-pull signal = (Ra + Rb) − (Rc + Rd)
Further, in the recorded information reproducing apparatus, tracking servo is executed based on the push-pull signal. That is, a recording information reproducing apparatus for recording and reproducing information data on a recording disk such as a DVD-R or DVD-RW acquires a disk address corresponding to the wobble form of the recording track based on the push-pull signal. While tracking servo is executed.

  Therefore, a dedicated recording circuit for obtaining the push-pull signal, the high-frequency signal, and the diagonal difference signal is provided in the conventional recording information reproducing apparatus corresponding to any of DVD-R, DVD-RW, and DVD-ROM. There is a problem that the device configuration becomes large. Therefore, there has been a demand for a recorded information reproducing apparatus capable of performing tracking servo on any of DVD-R, DVD-RW, and DVD-ROM using only the push-pull signal.

  However, the push-pull signal obtained when the convex recording pit row is read from the first recording layer of the DVD-ROM as described above, and the push-pull signal obtained when the concave recording pit row is read from the second recording layer. Are opposite in polarity. Therefore, in order to reproduce recorded information from such a DVD-ROM, first, trial reading is performed from the recording layer to be reproduced. At this time, if appropriate tracking control is not performed, the polarity of the push-pull signal is reversed, and then the reading operation is performed again by returning to the initial position.

  Therefore, a multi-layer recording disk having a recording layer in which concave recording pit rows are recorded and a recording layer in which convex recording pit rows are recorded, or a single layer recording in which the concave and convex shapes of the recording pits are not defined. When tracking control using a push-pull signal is performed on a disk, a reading operation may not be started immediately.

  The present invention has been made as a solution to such a problem, and when reproducing information data from a recording disk by adopting push-pull tracking control, the reproducing operation can be started quickly. An object of the present invention is to provide a possible recording disk and recorded information reproducing apparatus.

  The recording disk according to claim 1 is a recording disk having at least one recording layer, in which information data is recorded or an information data area in which information data is recorded in advance, and a lead in which disk identification information is recorded. An in area and a BCA (burst cutting area) in which polarity identification information indicating the polarity of the push-pull read signal obtained from the recording layer is recorded.

  According to a fourth aspect of the present invention, there is provided a recorded information reproducing apparatus comprising at least one recording layer, an information data area in which information data is recorded in advance, a lead-in area in which disc identification information is recorded, and the recording Recording information reproduction for reproducing recorded information based on a read signal read from a recording disk having BCA (burst cutting area) in which polarity identification information indicating the polarity of a push-pull read signal obtained from the layer is recorded A device for reproducing the polarity identification information recorded in the BCA based on the read signal, and the read signal and the polarity identification information corresponding to the reading of the lead-in area. Push-pull read signal generating means for generating a push-pull read signal based on the lead-in area based on the push-pull read signal Disc identification information reproducing means for reproducing the recorded disc identification information, and information data reproducing means for reproducing the information data recorded in the information data area from the read signal by reproduction processing based on the disc identification information And having.

  A recording disk having at least one recording layer includes a lead-in area in which disk identification information is recorded, and a BCA (burst cutting area) in which polarity identification information indicating the polarity of a push-pull read signal is recorded. .

  2A and 2B are diagrams showing an example of a schematic configuration of a recording disk according to the present invention.

  FIG. 2A shows a cross section of such a recording disk.

  As shown in FIG. 2A, such a recording disk is provided with a first recording layer RY1 in which convex recording pits are recorded and a second recording layer RY2 in which concave recording pits are recorded. ing. Each of the first recording layer RY1 and the second recording layer RY2 includes an information data area 1, a lead-in area 2, a lead-out area 3, and a PEP (phase encoded part) area 4, as shown in FIG. It is divided into. Note that the PEP area 4 may be provided in only one of the first recording layer RY1 and the second recording layer RY2.

  The information data area 1 is an area in which various information data such as video, audio, and computer data are recorded. The lead-in area 2 is an area in which lead-in data including the recording position of each information data piece recorded in the information data area 1, reproduction ownership time, disc identification information, and the like is recorded. The PEP area 4 is an area in which reproduction control data including tracking information, unevenness identification information, and the like is recorded after being subjected to phase encoding processing (described later). The tracking information is information that specifies a tracking method to be performed when reading the recording information from the first recording layer RY1 and the second recording layer RY2. The unevenness identifying information is information indicating whether the recording pits recorded in the first recording layer RY1 and the second recording layer RY2 are convex or concave, respectively.

  FIG. 3 is a diagram illustrating an example of a recording form in each region in the first recording layer RY1 (or the second recording layer RY2) from the top surface of the disc.

  As shown in FIG. 3, the information data area 1 is formed with a pit row of recording pits Pt1 carrying information data. In the lead-in area 2, a pit row is formed by recording pits Pt1 carrying the lead-in data. In the lead-in area 2 in the area WE where the disc identification information is to be recorded, a pit string wobbled in a form corresponding to the disc identification information is formed as shown in FIG. In the PEP area 4, a pit string is formed by recording pits Pt2 corresponding to a phase encoded signal obtained by subjecting the reproduction control data including the unevenness identification information to a phase encoding process. At this time, each of the recording pits Pt2 formed in the PEP area 4 has the same recording pit length. In the PEP area 4, each of the recording pits Pt2 is formed so as to be aligned in the track orthogonal direction on a plurality of adjacent tracks.

  Here, in the first recording layer RY1, each of the recording pits Pt1 and the recording pits Pt2 is a convex recording pit protruding from the disk surface as shown in FIG. On the other hand, in the second recording layer RY2, each of the recording pits Pt1 and recording pits Pt2 is a concave recording pit that is recessed with respect to the disk surface as shown in FIG.

  As described above, convex recording pits are recorded on the first recording layer RY1, and concave recording pits are recorded on the second recording layer RY2. Therefore, in the above-described embodiment, the convex / concave identification information represents the state [01 ] Is 2-bit data. When concave recording pits are recorded on the first recording layer RY1 and convex recording pits are recorded on the second recording layer RY2, the convex / concave identification information is 2-bit data of [10]. In addition, when convex recording pits are recorded on both the first recording layer RY1 and the second recording layer RY2, [00], both concave recording pits are formed on the first recording layer RY1 and the second recording layer RY2. If it is recorded, it becomes 2-bit data [11].

  FIG. 5 is a diagram showing an example of the configuration of a master recording apparatus for manufacturing a recording disk having the structure as described above.

  On the surface of the master 15, a resist layer for forming a resist pattern corresponding to the first recording layer RY1 (second recording layer RY2) is formed. The spindle motor 17 rotates the master 15 at a constant angular velocity. The feed stage 18 moves the master 15 and the spindle motor 17 in the radial direction of the master 15. The electron beam irradiation apparatus 10 irradiates the resist layer surface of the master 15 with an electron beam in accordance with the information data, reproduction control data, and lead-in data input to be recorded on the recording disk.

  The controller 25 creates a resist pattern corresponding to the first recording layer RY1 and a resist pattern corresponding to the second recording layer RY2 by controlling the electron beam irradiation apparatus 10, the spindle motor 17 and the feed stage 18, respectively.

  First, the controller 25 controls the electron beam irradiation apparatus 10 to irradiate an electron beam according to the information data on the resist layer surface corresponding to the information data area 1 as shown in FIG. As a result, a latent image corresponding to the recording pit Pt1 carrying information data is formed at a position on the surface of the resist layer corresponding to the information data area 1. Further, the controller 25 controls the electron beam irradiation apparatus 10 to irradiate the electron beam on the resist layer surface corresponding to the lead-in region 2 in accordance with the lead-in data. As a result, a latent image corresponding to the recording pit Pt1 carrying the lead-in data is formed at a position on the resist layer surface corresponding to the lead-in area 2. Further, the controller 25 applies an electron beam to a position on the resist layer surface corresponding to the PEP region 4 in accordance with a phase encoding signal obtained by subjecting the reproduction control data to a phase encoding process. The beam irradiation apparatus 10 is controlled. As a result, a latent image corresponding to the recording pit Pt2 carrying the reproduction control data is formed at a position on the surface of the resist layer corresponding to the PEP region 4.

  The phase encoding process for the reproduction control data is performed as follows, for example.

  First, in the PEP area 4, a recording track corresponding to the length of one rotation of the master 15 is regarded as one track. At this time, as shown in FIG. 6, one track is divided into three sectors. Each sector has a length of, for example, 177 bits, and an 11-bit gap is provided between the sectors. One sector includes a 16-bit preamble, a 1-bit synchronization sync, a 24-bit track address and sector address, a 128-bit reproduction control data, and an 8-bit error detection code. At this time, in the reproduction control data, 2-bit convex / concave identification information of [01] indicating that convex recording pits are formed in the first recording layer RY1 and concave recording pits are formed in the second recording layer RY2, respectively. include.

  The controller 25 performs phase encoding processing as shown in FIG. 7 (a) or FIG. 7 (b) on each of the preamble, sync sync, track address, sector address, reproduction control data, and error detection code, A phase encoded signal corresponding to the logical level of each bit is obtained. For example, as shown in FIG. 7A, the logic level 0 bit in the reproduction control data repeats changes of the logic levels 1 and 0 in the first half section AM of the predetermined period T, and the logic level 0 is fixed in the second half section PM. It is converted into a phase encoded signal. On the other hand, as shown in FIG. 7B, the logic level 1 bit in the reproduction control data is fixed at the logic level 0 in the first half section AM of the predetermined period T, and changes in the logic levels 1 and 0 in the second half section PM. Is converted into a phase encoded signal. The controller 25 generates a phase encoded signal for one track by repeatedly using the phase encoded signal for one sector obtained by the phase encoding process in three sectors as shown in FIG. Further, the controller 25 repeatedly supplies the phase-encoded signal for one track to the electron beam irradiation apparatus 10 N times. The electron beam irradiation apparatus 10 irradiates the resist layer surface of the master 15 with an electron beam only during a period in which the supplied phase encoding signal is at logic level 1. As a result, a data 0 section and a data 1 section in which a pit string is recorded by the recording pits Pt2 are formed in the form shown in FIG. 3 at a location on the resist layer surface corresponding to the PEP area 4. The data 0 section and the data 1 section are various data (preamble, synchronization sync, track address, sector address, reproduction control data, and error detection code shown in FIG. 4) before phase encoding processing to be recorded in the PEP area. This is a section on the recording track used to record one bit. At this time, the data 0 section is a section representing data bits of logic level 0. In the first half section AM, a latent image corresponding to the recording pit Pt2 is repeatedly formed, and no latent image is formed in the second half section PM. On the other hand, the data 1 section is a section representing data bits of logic level 1, and no latent image is formed in the first half section AM, and a latent image corresponding to the recording pit Pt2 is repeatedly formed only in the second half section PM. . At this time, in the PEP area 4, latent images corresponding to the recording pits Pt2 are formed in alignment with each other on the N recording tracks adjacent to each other in the disk radial direction, that is, the direction orthogonal to the recording tracks. That is, in the example shown in FIG. 3, in the PEP area 4, the phase code signals for one track corresponding to the reproduction control data are similarly recorded on the five adjacent recording tracks.

  Here, after recording on the master 15 (latent image formation on the resist layer) is completed, only the latent image portion formed on the resist layer of the master 15 is removed, whereby the first recording layer RY1 (second A resist pattern is formed for forming the recording layer RY2). Then, with such a resist pattern, a first recording layer RY1 in which pit rows are formed by convex recording pits Pt1 and Pt2, and a second recording layer RY2 in which pit rows are formed by concave recording pits Pt1 and Pt2 are formed. Are created respectively.

  Next, a reproducing apparatus for reproducing recorded information from a recording disk having the first recording layer RY1 and the second recording layer RY2 as described above will be described.

  FIG. 8 is a diagram showing the configuration of such a playback apparatus.

  In FIG. 8, the pickup 81 irradiates the first recording layer RY1 or the second recording layer RY2 of the recording disk 80 rotated by the spindle motor 82 with the reading beam light. Four optical detectors 20a to 20d arranged in the form shown in FIG. 1 are mounted on the pickup 81. Each of the optical detectors 20b is obtained by individually receiving reflected light from the recording disk 80 and performing photoelectric conversion. The read signals Ra to Rd are supplied to the addition read signal generation circuit 83 and the push-pull read signal generation circuit 84, respectively. The slider mechanism 91 moves the pickup 81 in the disk radial direction.

Sum read signal generating circuit 83 supplies the addition read signal R _SUM obtained by adding the read signal Ra~Rd each respective information data demodulating circuit 85 and a reproduction control data decoding circuit 86. Information data demodulating circuit 85 performs a predetermined demodulation process to such addition read signal R _SUM, is recorded in the information data area 1 and the lead-in area 2 of the first recording layer RY1 or second recording layer RY2 Data is reproduced and output as reproduction information data.

The reproduction control data decoding circuit 86 performs phase decoding on the phase-encoded signal as shown in FIG. 7 (a) or FIG. 7 (b) present in the added read signal _RSUM to obtain data. The reproduction control data consisting of 0 or data 1 is restored and supplied to the controller 100.

Push-pull read signal generating circuit 84, by the following operation using the read signal Ra~Rd each generate a push-pull read signal R _PP, and supplies it to the polarity inversion circuit 88.

R _PP = (Ra + Rb) − (Rc + Rd)
Incidentally, in order to obtain the push-pull read signal R _PP is not always necessary to use all the read signal Ra to Rd. In short, as the push-pull read signal generation circuit 84, the read signals Ra and Rd (output from the photodetectors 20a and 20d (or 20b and 20c) arranged in the track orthogonal direction among the photodetectors 20a to 20d) Alternatively, the difference between Rb and Rc) can be obtained and used as the push-pull read signal R _PP .

The polarity inversion circuit 88, when the polarity inversion signal PV of logic level 1 is supplied from the controller 100, the wobble signal a signal obtained by inverting the polarity of the push-pull read signal R _PP as a push-pull read signal R _PP ' This is supplied to each of the processing circuit 89 and the tracking servo circuit 90. On the other hand, when the polarity inversion signal PV of logic level 0 is supplied, the polarity inversion circuit 88 uses the push-pull read signal R _{PP as it} is as the push-pull read signal R _PP ′, and the wobble signal processing circuit 89 and the tracking servo circuit. 90 is supplied to each. Based on the push-pull read signal R _PP ′, the wobble signal processing circuit 89 extracts disc identification information based on the wobble form of the recording pit string formed in the area WE of the lead-in area 2 shown in FIG. This is supplied to the controller 100.

When the tracking servo ON signal is supplied from the controller 100, the tracking servo circuit 90 closes the tracking servo loop formed by the pickup 81, the push-pull read signal generation circuit 84, the polarity inversion circuit 88, and the tracking servo circuit 90. . At this time, the tracking servo circuit 90 generates a tracking error signal based on the push-pull read signal R _PP ′ and supplies it to the pickup 81. As a result, the pickup 81 deviates the optical axis of the read beam light in the track orthogonal direction by an amount corresponding to the tracking error signal so that the read beam light follows the recording pit row recorded on the recording disk 80. . On the other hand, when the tracking servo off signal is supplied from the controller 100, the tracking servo circuit 90 opens the tracking servo loop. As a result, the tracking operation of the read beam light with respect to the recording pit row, that is, the tracking operation is not performed.

  Next, the operation of the playback apparatus shown in FIG. 8 will be described.

  FIG. 9 is a diagram showing an unevenness identification information acquisition subroutine that is performed when the recording disk 80 is loaded in such a reproducing apparatus.

  In FIG. 9, first, the controller 100 starts the rotation of the spindle motor 82 (step S1). Next, the controller 100 supplies a tracking servo off signal to the tracking servo circuit 90 (step S2). By executing step S2, the tracking servo loop is opened. Next, the controller 100 controls the slider mechanism 91 to move the pickup 81 to the leading position of the PEP area 4 of the first recording layer RY1 (step S3), and starts to read the recording information from that position. Is controlled (step S4). By executing Steps S3 and S4, the pickup 81 is transferred to the top position of the PEP area 4 of the first recording layer RY1, and starts reading the recording information therefrom. At this time, since the tracking servo loop is in an open state, the reading beam light emitted from the pickup 81 traces, for example, on the white arrow shown in FIG. 3 so as to cross each track in the PEP region 4. It will be. As described above, in the PEP area 4, the recording pit row for one round of the disk carrying the reproduction control data is formed as it is on a plurality of adjacent tracks as it is. Further, in the PEP area, as shown in FIG. 3, the recording pits Pt2 are recorded in such a manner that they are aligned in the disc radial direction, that is, the track orthogonal direction. Accordingly, even if the read beam light moves so as to cross each track, the pickup 81 reads the phase-encoded signal from the PEP area 4 equivalent to the case where the information is correctly read from one track. Is possible. Here, the reproduction control data decoding circuit 86 restores reproduction control data composed of data 0 or data 1 by performing a phase decoding process on the phase-encoded signal, and supplies this to the controller 100.

  The controller 100 extracts the irregularity identification information from the reproduction control data, stores it in the irregularity identification information register 101 (step S5), and returns to the execution of the main routine (not shown).

  According to the unevenness identification information acquisition subroutine shown in FIG. 9, first, whether the recording pits recorded on the first recording layer RY1 and the second recording layer RY2 of the recording disk 80 are concave or convex. Is read from the PEP region 4. Then, the unevenness identification information is stored in the unevenness identification information register 101.

  Here, in reproducing information data from the information data area 1 of the first recording layer RY1 or the second recording layer RY2 of the recording disk 80, the controller 100 executes a push-pull read signal polarity setting subroutine shown in FIG. .

In FIG. 10, first, the controller 100 is recorded on the recording layer (first recording layer RY1 or second recording layer RY2) to be reproduced based on the unevenness identification information stored in the unevenness identification information register 101. It is determined whether or not the recording pit is concave (step S11). If it is determined in step S11 that it is a concave recording pit, the controller 100 supplies a polarity inversion signal PV of logic level 1 to the polarity inversion circuit 88 (step S12). By the execution of step S12, the polarity inversion circuit 88, the push-pull read signal R _PP push-pull read signal R _PP of the polarity inverted in ', the wobble signal processing circuit 89 and the tracking servo circuit 90 supplies to each. On the other hand, if it is determined in step S11 that it is not a concave recording pit, the controller 100 supplies the polarity inversion signal PV of logic level 0 to the polarity inversion circuit 88 (step S13). By execution of step S13, the polarity inversion circuit 88 supplies the wobble signal processing circuit 89 and the tracking servo circuit 90 respectively the push-pull read signal R _PP as it is a push-pull read signal R _PP '. After executing step S12 or S13, the controller 100 supplies a tracking servo ON signal to the tracking servo circuit 90 (step S14). Next, the controller 100 controls the pickup 81 to start reading information with respect to the lead-in area 2 of the recording layer to be reproduced of the information data (step S15). By executing steps S14 and S15, lead-in data is acquired from the lead-in area 2 of the recording layer to be reproduced, and information data can be reproduced from the information data area 1 of the recording layer.

  As described above, in the push-pull read signal polarity setting subroutine shown in FIG. 10, first, on the basis of the unevenness identification information read from the PEP area 4 of the recording disk 80, the recording recorded in the recording layer to be reproduced from now on. It is determined whether or not the pit is concave. At this time, when it is determined that the recording pit is not concave, that is, convex, the polarity of the push-pull read signal generated by the push-pull read signal generation circuit 84 is set to be maintained as it is. . On the other hand, when it is determined that the shape is concave, a setting is made to reverse the polarity of the push-pull read signal. Therefore, when the recording pit recorded on the recording layer to be reproduced is convex, tracking control is performed according to the push-pull read signal generated by the push-pull read signal generation circuit 84, In the case of the concave shape, tracking control according to the push-pull read signal whose polarity is reversed is performed.

  In the above embodiment, the recording disk 80 having two recording layers (RY1, RY2) as shown in FIG. 8 has been described as an example, but the present invention has three or more recording layers. The same applies to recording disks. Also, when manufacturing a recording disk, if it is left to the disc manufacturer's will to adopt convex recording pits or concave recording pits, it has only one recording layer. The present invention can also be applied to a single-layer recording disk, and the same effect can be obtained.

  In the above embodiment, the recording disk on which convex or concave recording pits are recorded has been described as an example. However, the information data can be changed by changing the characteristics on the recording surface by phase change recording or magneto-optical recording. The present invention can also be applied to a recording disk such as a DVD-R that enables writing of.

  FIG. 11 is a plan view showing a schematic area section of a recording disk commercially available for general use in such a writable recording disk.

  As shown in FIG. 11, the recording disk is divided into an information data area 110, a lead-in area 120, a lead-out area 130, and a BCA (burst cutting area) 140.

  The information data area 110 is an area in which various information data such as video, audio, and computer data are recorded. The lead-in area 120 is an area in which lead-in data including the recording position of each information data piece recorded in the information data area 110, reproduction ownership time, disc identification information, and the like is recorded. The BCA 140 is an area where reproduction control data including tracking information, unevenness identification information, and the like is recorded by a bar code (described later). The tracking information is information for designating a tracking method to be performed when recording information is read from the information data area 110 and the lead-in area 120. The convex / concave identification information is information for designating whether the information data and lead-in data are recorded on the convex portion in each of the information data area 110 and the lead-in area 120 or on the concave portion. is there.

  FIG. 12 is a diagram showing the form in each of the information data area 110, the lead-in area 120, and the BCA 140 from the upper surface of the disk.

  As shown in FIG. 12, in the information data area 110 and the lead-in area 120, wobbled groove tracks GT and land tracks LT are alternately formed in a spiral shape. As shown in FIG. 13A or 13B, the groove track GT is convex and the land track LT is concave. Here, in order to write information data on such a recording disk, the disk recorder irradiates either the land track LT or the groove track GT intermittently with a recording beam according to the information data. At this time, the portion irradiated with the recording beam becomes a region having different characteristics (for example, reflectance, magnetization direction, etc.) from the portion not irradiated. Note that this region is flat and does not have an uneven shape like the recording pit described above, but corresponds to the recording pit, and hence is hereinafter referred to as a virtual pit. Here, when the recording beam corresponding to the information data is irradiated onto the groove track GT, a virtual pit VP is formed on the groove track GT as a concave portion as shown in FIG. On the other hand, when the recording beam corresponding to the information data is irradiated onto the land track LT, a virtual pit VP is formed on the land track LT as a convex portion as shown in FIG. At this time, the concave / convex identification information for specifying whether the virtual pit VP carrying the information data is recorded on the groove track GT as the concave portion or the land track LT as the convex portion is stored in the BCA 140 as shown in FIG. It is recorded in. In the BCA 140, the unevenness identification information is represented by an array pattern of strip-like bar pits BP extending from the inner periphery to the outer periphery of the disc as shown in FIG. Therefore, since the tracking servo loop is in an open state, even if the reading beam light traces the locus of the white arrow as shown in FIG. It can be read in the same way.

  FIG. 14 is a plan view showing a schematic area section of an authoring recording disk sold only to contractors in a writable recording disk.

  As shown in FIG. 14, the recording disk is divided into an information data area 111, a lead-in area 121, a lead-out area 131, and a PEP (phase encoded part) area 141.

  The information data area 111 is an area in which various information data such as video, audio, and computer data are recorded. The lead-in area 121 is an area in which lead-in data including the recording position of each information data piece recorded in the information data area 111, reproduction ownership time, disc identification information, and the like is recorded. The PEP area 141 is an area where reproduction control data including tracking information, unevenness identification information, etc. is recorded after being phase-encoded as described above. The convex / concave identification information is information for designating whether the information data and the lead-in data are recorded on the convex portion in each of the information data area 111 and the lead-in area 121 or the concave portion. is there.

  FIG. 15 is a diagram showing the form in each of the information data area 111, the lead-in area 121, and the PEP area 141 from the upper surface of the disc.

  As shown in FIG. 15, in the information data area 111 and the lead-in area 121, wobbled groove tracks GT and land tracks LT are alternately formed in a spiral shape. As shown in FIG. 13A or 13B, the groove track GT is convex and the land track LT is concave. Here, when the recording beam corresponding to the information data is irradiated onto the groove track GT, a virtual pit VP corresponding to the recording pit is formed on the groove track GT as a concave portion as shown in FIG. Is done. On the other hand, when the recording beam corresponding to the information data is irradiated onto the land track LT, a virtual pit VP corresponding to the recording pit is formed on the land track LT as a convex portion as shown in FIG. Is done. At this time, the concave / convex identification information for specifying whether the virtual pit VP carrying the information data is recorded on the groove track GT as the concave portion or the land track LT as the convex portion is PEP area as shown in FIG. 141 is recorded. The recording form in the PEP area 141 is the same as that shown in FIG. 3 except that the recording pits Pt are formed on the wobbled groove track GT or land track LT.

  As described above, in the recording disk according to the present invention, the identification information indicating the polarity of the push-pull read signal is recorded in advance on the BCA capable of reading information in the tracking servo open state.

  Therefore, in the recorded information reproducing apparatus adopting tracking control by the push-pull method, the identification information is read from the recording disk in the tracking servo open state, and the polarity of the push-pull read signal is set according to the identification information. Therefore, it is possible to quickly start the information reproduction operation without performing trial reading.

It is a figure which shows the arrangement | sequence of each photodetector 20a-20d mounted in the pick-up. It is a figure which shows schematic structure of the recording disc by this invention. It is a figure which shows a part of surface form of the recording layer of the recording disc by this invention. It is a figure which shows a concave recording pit and a convex recording pit, respectively. It is a figure which shows schematic structure of an original recording device. 4 is a diagram showing a format of one track in a PEP area 4. FIG. It is a figure which shows the waveform of the phase encoding signal corresponded to data 1 bit length. It is a figure which shows the structure of the reproducing | regenerating apparatus by this invention. It is a figure which shows the unevenness | corrugation identification information acquisition subroutine implemented by the controller 100 of the reproducing | regenerating apparatus shown in FIG. It is a figure which shows the push pull reading signal polarity setting subroutine implemented by the controller 100 of the reproducing | regenerating apparatus shown in FIG. It is a top view which shows the general area | region division of the writable recording disc marketed for general use. It is a figure which shows a part of surface form of the recording disc shown by FIG. It is a figure which shows an example of the case where information data is recorded on the land track | truck LT, and the case where it records on a groove track | truck, respectively. It is a top view which shows the outline area | region division of the writable recording disc for authoring. It is a figure which shows a part of surface form of the recording disc shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electron beam irradiation apparatus 15 Master 80 Recording disk 81 Pickup 84 Push pull read signal generation circuit 88 Polarity inversion circuit 90 Tracking servo circuit
25,100 Controller 101 Unevenness identification information register

Claims (4)

A recording disk having at least one recording layer,
An information data area in which information data is recorded or information data is recorded in advance;
A lead-in area in which disc identification information is recorded;
A recording disk comprising: a BCA (burst cutting area) in which polarity identification information indicating a polarity of a push-pull read signal obtained from the recording layer is recorded.   2. The recording disk according to claim 1, wherein a wobbled track based on the disk identification information is formed in the lead-in area. A plurality of BCA units are arranged on each track in the BCA,
A predetermined gap region is provided between the BCA units adjacent to each other,
2. The recording disk according to claim 1, wherein an error detection code is recorded at a terminal portion of each BCA unit. An information data area having at least one recording layer in which information data is recorded in advance, a lead-in area in which disc identification information is recorded, and a polarity indicating the polarity of a push-pull read signal obtained from the recording layer BCA (burst cutting area) in which identification information is recorded, and a recorded information reproducing device that reproduces recorded information based on a read signal read from a recording disk,
Polarity identification information reproducing means for reproducing the polarity identification information recorded in the BCA based on the read signal;
Push-pull read signal generating means for generating a push-pull read signal based on the read signal corresponding to reading of the lead-in area and the polarity identification information;
Disc identification information reproducing means for reproducing the disc identification information recorded in the lead-in area based on the push-pull read signal;
An information data reproducing device for reproducing the information data recorded in the information data area from the read signal by a reproducing process based on the disc identification information.

Images