JP2009080933A - Hybrid optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hybrid optical disk achieving smooth and effective reproduction of an HDDVD layer and a DVD layer disposed in a layered direction. <P>SOLUTION: When the hybrid optical disk is loaded, reproduction of the next generation DVD layer is performed prior to the DVD layer (S102 to S104). A jump to the DVD layer is suitably performed according to necessity of the jump to the DVD layer and reproduction of the DVD layer is performed (S105 to S109). The jump to the DVD layer is performed based on command information (jump command) held in the next generation DVD layer. When reproduction of a title designated by the command is completed, return to the HDDVD layer is performed and reproduction is restarted from a position following the reproduction position upon jump (S110 to S112, S102). Thereby, contents of the HDDVD layer and the DVD layer can be reproduced as one stream. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hybrid type optical disc, and is particularly suitable for use in a hybrid type optical disc in which a DVD layer and a next generation DVD layer are arranged.

Next-generation DVD (Digital Versatile) using blue laser light with a wavelength of about 405 nm
Disc) is being standardized. In such standardization, two recording layers, a recording layer corresponding to blue laser light (hereinafter referred to as “HDDVD layer”) and a recording layer corresponding to red laser light (hereinafter referred to as “DVD layer”), are stacked in the stacking direction. Is being considered.

  In such a next-generation DVD (hereinafter referred to as “hybrid type next-generation DVD”), the DVD layer is arranged in front of the laser beam incident side. Further, the same format as the existing DVD is applied to the DVD layer as it is. This DVD layer does not hold information indicating that an HDDVD layer exists further behind. Therefore, when the drawing process is performed on the DVD layer, the disc is handled as if it is a DVD having a single recording layer.

The following Patent Document 1 introduces an optical disc having two recording layers and a drive device thereof.
JP 2003-346348 A

  Usually, the drive device is designed to perform the pull-in process on the first recording layer as viewed from the optical pickup side. At this time, if the lead-in information can be read from the recording layer, the reproducing process is performed on the recording layer. For this reason, when a hybrid next-generation DVD is mounted on this type of drive device, reproduction is performed on the DVD layer on the optical pickup side. However, as described above, the DVD layer does not hold information indicating that the HDDVD layer exists. For this reason, on the drive device side, the same reproduction processing as that performed when a single layer type DVD is loaded is performed. In this case, although there is an HDDVD layer that can provide high-capacity content, the reproduction may be overlooked.

  Accordingly, an object of the present invention is to provide a hybrid optical disc for an optical disc apparatus that can avoid such problems and can smoothly and effectively reproduce the HDDVD layer and the DVD layer.

  In the present invention, when a hybrid type optical disc is loaded, the next-generation DVD layer is reproduced in preference to the DVD layer. Then, depending on whether or not jumping to the DVD layer is necessary, it is possible to appropriately jump to the DVD layer and reproduce the DVD layer.

As described above, the format of the DVD layer must conform to the DVD standard. This is to allow the hybrid type optical disc to be reproduced without any trouble when it is mounted on an existing DVD player. However, the HDDVD layer has no such restriction. Therefore, there remains room for adding a jump command to the DVD layer to the HDDVD layer.

  In one aspect of the present invention, the next-generation DVD layer is reproduced in preference to the DVD layer, and the jump to the DVD layer is performed based on command information held in the next-generation DVD layer. As a result, the DVD layer can be appropriately reproduced while preferentially reproducing the large-capacity next-generation DVD layer.

  The present invention has the following features in each aspect.

  The invention according to claim 1 is a hybrid type optical disc in which a DVD layer and a next-generation DVD layer are arranged, and the next-generation DVD layer has a jump to the DVD layer after reproduction of the next-generation DVD layer is started. It is characterized in that command information for specifying the jump destination is held.

  According to a second aspect of the present invention, in the hybrid optical disk according to the first aspect, command information for setting a flag indicating that the next-generation DVD layer has been reproduced is held in the next-generation DVD layer. And

  In the following embodiment, as a command information holding mode, a mode in which a jump command and a variable setting command are held in a reproduction list is shown. In this case, the jump command instructs the jump to the DVD layer and the jump destination, and the variable setting command sets 1 to the variable i indicating that the next-generation DVD layer (HDDVD layer) has been reproduced.

  According to the hybrid type optical disc of the present invention, since the next-generation DVD layer is played back in preference to the DVD layer in the optical disc playback apparatus, there is no fear that the playback of the large-capacity next-generation DVD layer is overlooked. Further, since the jump from the next generation DVD layer to the DVD layer is appropriately performed, the DVD layer is also effectively reproduced and used.

  At this time, by jumping to the DVD layer based on the command information held in the next generation DVD layer, the content recorded in the next generation DVD layer and the content recorded in the DVD layer are linked. Control can be performed smoothly. In addition, the content of the next generation DVD layer and the content of the DVD layer are restored by returning to the HDDVD layer in response to the end of reproduction of information recorded on the DVD layer (information for one title, etc.). It can be played back as a single stream.

  Furthermore, by setting a flag so that it is possible to grasp that the jump is from the HDDVD layer to the DVD layer, it is possible to distinguish between playback of the DVD layer by such jump and playback of only the DVD layer from the beginning. Can do. Thereby, it is possible to easily determine whether or not it is necessary to return to the HDDVD layer, and it is possible to facilitate such return control.

  The effects and significance of the present invention will become more apparent from the following description of embodiments. However, the following embodiment is merely an example, and the meaning of the terminology of the present invention or each constituent element is not limited to the following embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  In this embodiment, there is an optical disc apparatus capable of reproducing compatible next-generation DVD (single layer, HDDVD layer single-sided multi-layer, HDDVD layer / DVD layer single-sided hybrid) and DVD (single layer, DVD layer single-sided multi-layer). Illustrated.

  FIG. 1 shows the structure of a hybrid next-generation DVD.

  In the hybrid next-generation DVD 1, a substrate 11 having an HDDVD layer 12 formed on one side and a substrate 13 having a DVD layer 14 formed on one side are bonded together by an adhesive layer 15 and further printed on the opposite side of the substrate 11 The layer 16 is formed. Laser light is incident from the substrate 13 side. In the recordable type, the HDDVD layer 12 and the DVD layer 14 are formed with spiral tracks. In the reproduction-only type, the pits are arranged in a spiral shape.

  The data format of the DVD layer 14 is the same as the data format of the existing DVD. The lead-in information of the DVD layer 14 does not include information indicating that the HDDVD layer 12 exists. The DVD layer 14 transmits and reflects blue laser light having a wavelength of about 405 nm and red laser light having a wavelength of about 655 nm at a prescribed ratio.

  A data format conforming to the next-generation DVD standard is applied to the HDDVD layer 12. That is, in the hybrid next-generation DVD, lead-in information exists in both the DVD layer 14 and the HDDVD layer 12. The lead-in information of the HDDVD layer 12 does not include information indicating that the DVD layer 14 exists (it may be included in the future). However, the HDDVD layer 12 holds a jump command and a variable setting command as will be described later. The jump command instructs the jump to the DVD layer and the jump destination, and the variable setting command sets 1 to a variable i indicating that the HDDVD layer has been reproduced.

  The HDDVD layer 14 reflects the blue laser light with a prescribed reflectance, but is formed of a material that has a significantly lower reflectance with respect to the red laser light. By setting the reflectivity, it is determined that the hybrid next-generation DVD is loaded as will be described later.

  Note that a multi-layer DVD in which two DVD layers are arranged on one side has a configuration in which the HDDVD layer 12 is replaced with a DVD layer in the configuration of FIG. In this case, lead-in information exists only in the DVD layer closer to the pickup of the two DVD layers. The lead-in information includes information indicating that there are two DVD layers.

  A multi-layer type next-generation DVD in which two HDDVD layers are arranged on one side has a configuration in which the DVD layer 14 is replaced with an HDDVD layer in the configuration of FIG. Also in this case, lead-in information exists only in the HDDVD layer closer to the pickup of the two HDDVD layers. This lead-in information includes information indicating that there are two HDDVD layers.

  FIG. 2A shows an S curve on a focus error signal when a focus search is performed by irradiating a red laser beam to a multi-layer DVD or a next-generation DVD having two DVD layers or HDDVD layers on one side. This is schematically illustrated.

  FIG. 2B schematically illustrates an S curve on the focus error signal when a focus search is performed by irradiating the hybrid next-generation DVD with red laser light.

  When a focus search is performed by irradiating a single layer type DVD or a next generation DVD with red laser light, an S curve due to the recording layer appears on the focus error signal. In this case, an S curve due to the substrate surface appears in addition to this S curve, but the peak interval of this S curve is sufficiently smaller than the peak interval PP2 in FIG. By appropriately setting the limit value for this, it is possible to avoid erroneously detecting the S curve as being caused by the recording layer. The disc type can be determined based on the difference between these S curves.

  FIG. 3 shows the configuration of the optical disc apparatus. In the figure, only the blocks related to the reproduction system are shown.

  The optical disc apparatus includes an optical pickup 101, a signal generation circuit 102, a servo circuit 103, a laser drive circuit 104, a demodulation circuit 105, a controller 106, a spindle motor 107, and an AV processing circuit 108.

  The optical pickup 101 is provided with a semiconductor laser that emits blue laser light having a wavelength of about 405 nm and red laser light having a wavelength of about 655 nm. Furthermore, an objective lens for converging these laser beams on the disk, an objective lens actuator for driving the objective lens in the focus direction and the tracking direction, a photodetector for receiving the reflected light from the disk, and emission from the semiconductor laser And an optical system for guiding each reflected laser beam to the objective lens and guiding the reflected light from the disk to the photodetector.

  The signal generation circuit 102 performs arithmetic processing on a signal from a photodetector arranged in the optical pickup 101 to generate various signals such as an RF signal, a focus error signal, and a tracking error signal, and outputs them to a corresponding circuit. .

  The servo circuit 103 generates a focus servo signal and a tracking servo signal based on the signal input from the signal generation circuit 102 and outputs it to the objective lens actuator of the optical pickup 101. A motor servo signal is generated based on the signal input from the signal generation circuit 102 and output to the spindle motor 107.

  The laser drive circuit 104 outputs a drive signal to the semiconductor laser in the optical pickup 101 based on a control signal input from the controller 106. By such control, light emission of the blue laser light and the red laser light is appropriately switched.

  The demodulation circuit 105 demodulates the RF signal input from the signal generation circuit 102 to generate reproduction data, and outputs the reproduction data to the AV processing circuit 108. The demodulation circuit 105 includes a demodulation unit (HDDVD decoder unit) that performs data demodulation according to the next-generation DVD data format and a demodulation unit (DVD decoder unit) that performs data demodulation according to the DVD data format. Which demodulator is used is set based on a control signal from the controller 106. Further, sub-information such as the possibility of demodulation in each demodulator and lead-in information is output from the demodulation circuit 105 to the controller 106.

  The controller 106 stores various data in the built-in memory and controls each unit according to a preset program. A focus error signal is input from the signal generation circuit 102 to the controller 106 during the disc determination process. The controller 106 performs disc discrimination based on this signal. Further, the controller 106 performs jump control between the HDDVD layer and the DVD layer based on command information (described later) input from the demodulation circuit 105.

  The AV processing circuit 108 processes the reproduction data input from the demodulation circuit 105 to acquire video information and audio information. Among these, the video information is output to a display device 200 such as a television in accordance with a control instruction from the controller 106. The audio information is output to a speaker or the like (not shown) according to a control instruction from the controller 106. In addition, information for outputting a predetermined screen or sound is output from the AV processing circuit 108 as appropriate in accordance with a signal from the controller 106.

  FIG. 4 shows a data format of content information recorded on the HDDVD layer 12 and the DVD layer 14 of the hybrid next-generation DVD 1.

  As shown in the figure, the content information is divided into a reproduction list and a unit group. Of these, video / audio data (MPEG data, etc.) is stored in the unit group (unit 1, unit 2,...). The reproduction list stores management information such as link information for linking each unit and various command information.

  A stream of video / audio data is constructed by linking the units in order according to the link information in the reproduction list. When a plurality of titles (program units) are held in the recording layer, the video / audio data stream is classified for each title. When each title is linked, a description to that effect is given in the reproduction list. When the playback is ended with one title, an end command is stored in the playback list.

  In the present embodiment, the playback list of the HDDVD layer 12 includes a description for linking the titles in order. The playback list of the DVD layer 14 includes an end command for completing the playback process for each title.

  Further, in the present embodiment, a command (1) for setting “1” to the variable i among the variables a to p defined in common in the DVD layer 14 and the HDDVD layer 12 in the playback list of the HDDVD layer 12. Variable setting command) is included. Accordingly, when the reproduction list of the HDDVD layer 12 is reproduced, “1” is set to the variable i. Since such a command is not included in the reproduction list of the DVD layer 14, even if the DVD layer 14 is reproduced after the reproduction of the HDDVD layer 12 is reset, the variable i is not set to “1”. When a transition is made to playback to the DVD layer 14 via playback of the HDDVD layer 12, “1” is set to the variable i.

  Furthermore, in the present embodiment, a command (jump command) for jumping from a predetermined unit on the HDDVD layer 12 to a unit on the DVD layer 14 and playing a predetermined title is included in the playback list of the HDDVD layer 12. Is included. Such a jump command may specify a target title on the DVD layer 14, or may specify a start address (unit number, etc.) of the title.

  In this embodiment, main content such as a movie is recorded on the HDDVD layer 12 in the high definition mode, and auxiliary content related to each scene of the main content is recorded on the DVD layer 14 in the normal mode. Yes. In this case, a jump command for jumping from the unit corresponding to a scene having the main content to the title start position of the auxiliary content related to the scene is included in the reproduction list of the HDDVD layer 12. Thereby, the jump from the HDDVD layer 12 to the DVD layer 14 is executed, and the title of the auxiliary content related to the scene with the main content is reproduced. When the reproduction of the title ends, the reproduction position returns to the position on the HDDVD layer 12 following the position before the jump, and the reproduction of the main content is continued.

  FIG. 5 shows a process flowchart at the time of disc reproduction.

  When a disk is loaded, a disk discrimination process is first performed (S101). Such disc discrimination can be performed using various methods. For example, the information of each recording layer can be actually demodulated while switching between the laser beam and the demodulator, and disc discrimination can be performed based on the possibility of demodulation.

  In the present embodiment, disc discrimination is performed based on the S curve on the focus error signal shown in FIG. That is, after the red laser light is turned on, a focus search for the disc is performed. Then, based on the number of S curves appearing on the focus error signal, it is determined whether it is a single layer type or a multi layer type. In the case of the multi-layer type, the ratio (R = PP2 / PP1) of the peak interval PP1 of the largest S curve and the peak interval PP2 of the next largest S curve is calculated. If the peak ratio R is equal to or greater than the threshold, the disc is determined to be a multi-layer disc in which a plurality of DVD layers or HDDVD layers are arranged. On the other hand, if the peak ratio R is less than the threshold and the peak interval PP2 of the S curve is greater than or equal to the detection limit of the S curve, the hybrid next-generation DVD in which the DVD layer and the HDDVD layer are arranged is determined.

  If it is determined that the disc is a multi-layer disc in which a plurality of DVD layers or HDDVD layers are arranged, the first recording layer as viewed from the optical pickup side is read with red laser light. Then, the read signal is demodulated by the DVD decoder unit of the demodulation circuit 105 to determine whether demodulation is possible. If it can be demodulated, it is determined as a multi-layer disc in which a plurality of DVD layers are arranged. If it cannot be demodulated, it is determined as a multi-layer disc in which a plurality of HDDVD layers are arranged. In this case, it is possible to determine whether or not the first recording layer can be demodulated with blue laser light and to verify that the multi-layer disc has a plurality of HDDVD layers.

  If the single layer type is discriminated from the number of S curves appearing on the focus error signal, the recording layer is read with red laser light. Then, the read signal is demodulated by the DVD decoder unit of the demodulation circuit 105 to determine whether demodulation is possible. If it can be demodulated, it is determined as a single layer disc in which one DVD layer is arranged. If it cannot be demodulated, it is determined as a single layer disc in which one HDDVD layer is arranged. In this case, it is possible to determine whether or not the recording layer can be demodulated with blue laser light, and to verify that the single layer disc has one HDDVD layer.

  If the determination result in S101 is not a hybrid next-generation DVD, playback is performed in the disc mode corresponding to the determination result (S120).

  When the determination result in S101 is the hybrid next-generation DVD, the lighting laser is switched to the blue laser (S102), and reproduction is performed on the HDDVD layer 12 at the back as viewed from the optical pickup side (S103, S104). During such reproduction, the lead-in information of the HDDVD layer 12 and the above-described reproduction list are read. Then, the data of each unit is sequentially reproduced according to the reproduction list.

  When the reproduction list is read in this way, the above-described variable setting command stored in the reproduction list is executed. As a result, “1” is set to the variable i described above. Note that the initial value (for example, “0”) of the variable i is set when the disc is loaded or when playback of the disc is started.

  Thereafter, the playback of the HDDVD layer 12 is continued until the playback target unit reaches the unit specified by the jump command in the playback list (S105). When the reproduction position reaches the unit specified by the jump command (S105: Y), the reproduction position (unit number) is stored (S106), and then the lighting laser is switched to the red laser (S107). Thereafter, a jump command is executed to jump to the DVD layer 14 (S108).

  When executing the jump command, first, the lead-in information and the reproduction list of the DVD layer 14 are read. The read list includes the end command described above.

  When the reproduction list is read, the start unit of the title designated by the jump command is accessed, and the title is reproduced (S109). This reproduction is executed up to the final unit of the title unless an interrupt command is input from the user (S110). When the reproduction of the last unit of the title is finished, an end command is executed, and the reproduction of the DVD layer 14 is finished. Even when an interrupt command is input from the user on the way, the reproduction of the DVD layer 14 is ended.

  Thus, when the reproduction of the DVD layer 14 is completed, the above variable i is referred to. The variable i is used for determining whether to jump to the HDDVD layer 12. That is, if the variable i is set to “1”, it is determined that a jump to the HDDVD layer 12 is performed. If the variable i is not set to “1”, the jump to the HDDVD layer 12 is not performed and the reproduction process is ended.

  In this processing flow, since the variable i is set to “1” in S104, it is determined that a jump to the HDDVD layer 12 is performed. Note that if the reproduction of the DVD layer 14 is not due to a jump from the HDDVD layer 12, the variable i is not set to "1". In this case, the reproduction process is terminated according to the completion of reproduction of the title.

  If it is determined that a jump to the HDDVD layer 12 is to be performed, the final playback position (unit number) of the HDDVD layer stored in S106 is referred to, and the playback position (unit number) following this position is referred to. Is set as the target position after the jump (S112). Then, after the lighting laser is switched to the blue laser (S102), the jump to the HDDVD layer 12 is executed, and the target position set in S112 is accessed (S103).

  Accordingly, the reproduction of the main content (HDDVD layer) is started again from the position that continues when jumping to the DVD layer 14. This reproduction is continued until the reproduction position reaches the unit specified by the next jump command (S105). When the playback position reaches the unit specified by the jump command (S105: Y), the playback laser (unit number) is stored (S106) as described above, and then the lighting laser is switched to the red laser. (S107) A jump command is executed. Thereby, a jump to the DVD layer 14 is performed, and the title specified by the jump command is played (S108, 109). Thereafter, the same processing is repeated until the reproduction of the HDDVD layer 12 is completed.

  In the above example, the determination as to whether the loaded disc is a hybrid next-generation DVD is performed using the red laser beam. However, this determination is performed using the blue laser beam. Also good. In this way, it is not necessary to switch the lighting laser when shifting from the disc determination to the processing for the disc, and the processing of S102 can be omitted.

  In addition, when determining whether it is a hybrid next generation DVD using a blue laser beam, the following process flows can be applied, for example.

  First, a focus search is performed with blue laser light, and the number of recording layers is determined from the number of S curves obtained at that time. If there are a plurality of recording layers, the first recording layer and the next recording layer as viewed from the optical pickup side are read with blue laser light. Then, each read signal is demodulated by the HDDVD decoder section of the demodulation circuit 105 to determine whether demodulation is possible. At this time, if the demodulation for both recording layers is NG, it is determined that the DVD is a multi-layer type DVD having two DVD layers. If both recording layers are demodulated, it is determined that the next-generation DVD is a multi-layer type in which two HDDVD layers are arranged. If the demodulation for the first recording layer is NG and the demodulation for the next recording layer is OK, the hybrid next-generation DVD in which a plurality of HDDVD layers and DVD layers are arranged is determined.

  FIG. 6 is a diagram schematically showing a reproduction operation when a jump command is set for each title end.

In this case, playback is started from title 1 of the HDDVD layer. When this playback ends,
The jump command is executed and the title 1 of the DVD layer is reproduced. Thereafter, when the reproduction of the title 1 of the DVD layer is finished, the variable i is referred to and jumped to the start position of the title 2 of the HDDVD layer. Then, the title 2 of the HDDVD layer is reproduced. If an interrupt command is input from the user during the playback of the DVD layer title, a jump to the HDDVD layer is performed and the next title of the HDDVD layer is played back. Thereafter, the jump between the HDDVD layer and the DVD layer is repeated in the same manner, and the titles of the respective layers are sequentially reproduced.

  As described above, according to the present embodiment, since the HDDVD layer 12 is reproduced in preference to the DVD layer 14, the HDDVD layer 12 can be reliably reproduced. Also, by appropriately including a jump command in the playback list of the HDDVD layer 12, playback using the DVD layer 14 can be realized effectively. At this time, the playback position is returned to the position following the position before the jump of the next-generation DVD layer 12 in accordance with the playback of the DVD layer 14 for one title. The situation where the DVD layer 14 is continuously reproduced does not occur. According to the present embodiment, it is possible to realize stream reproduction in which the contents of the HDDVD layer 12 and the DVD layer 14 are linked.

  In addition, this invention is not limited to the said embodiment, A various change is possible for others.

  For example, in the above embodiment, the jump from the HDDVD layer to the DVD layer is executed at the timing when the playback position reaches the unit position specified by the jump command. In addition, a jump from the HDDVD layer to the DVD layer can be executed in response to a jump command input from the user. In this case, for example, when a jump command is input, a jump command associated with the title being reproduced is executed. Also, the playback unit at the time of jump command input is stored, and the return to the HDDVD layer is the unit position following this playback unit. In this way, auxiliary content for each title of the main content can be arbitrarily called and reproduced.

  Instead of using the jump command, a jump from the HDDVD layer to the DVD layer can be performed in accordance with a jump command arbitrarily input from the user. In this case, a means for designating a jump destination in the DVD layer is required separately. As this means, for example, a method of presenting the title menu of the DVD layer to the user in response to a jump command can be used. That is, the jump to the DVD layer is executed with the start position (start unit) of the title selected and instructed by the user in the presented title menu as the jump destination.

  In addition, in the above description, the DVD layer is restored based on the completion of reproduction of the DVD layer and the setting state of the variable i. However, a method for describing a condition program for returning to the HDDVD layer in the HDDVD layer, Also, a method of returning to the HDDVD layer when a set time has elapsed since the reproduction of the DVD layer can be used.

  The embodiments of the present invention can be appropriately modified in various ways within the scope of the technical idea shown in the claims.

The figure which shows the structure of the hybrid type next generation DVD which concerns on embodiment The figure explaining S curve of the focus error signal concerning an embodiment The figure which shows the structure of the optical disk apparatus which concerns on embodiment The figure which shows the data format of the content information which concerns on embodiment Process flowchart at the time of disc playback according to the embodiment The figure which shows typically the disc reproduction operation | movement which concerns on embodiment

Explanation of symbols

101 Optical Pickup 102 Signal Generation Circuit 103 Servo Circuit 104 Laser Drive Circuit 105 Demodulation Circuit 106 Controller

Claims (2)

In the hybrid type optical disc in which the DVD layer and the next generation DVD layer are arranged,
A hybrid type optical disc, wherein the next-generation DVD layer retains command information for specifying a jump to the DVD layer and a jump destination after the reproduction of the next-generation DVD layer is started. The hybrid optical disk according to claim 1, wherein
A hybrid type optical disc, wherein command information for setting a flag indicating that the next generation DVD layer has been reproduced is held in the next generation DVD layer.

Images