JP2007073189A - Optical disc and optical disc device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that, in an optical disc with a plurality of different standard information layers formed in one disc, long time is required for making access, since a type of one information layer is not recorded in another information layer, and at the time of performing reading/writing by a compatible optical device conforming to the plurality of optical disc standards, the type of the information layer is required to be read out to select a tracking error signal generating method corresponding to the type of the information layer evrey time the accessed information layer is changed. <P>SOLUTION: In an optical disc with a plurality of different standard information layers formed in one disc, a type of one information layer is recorded in another information layer. At the time of performing reading/writing by a compatible optical device conforming to the plurality of optical disc standards, the access time is shortened by selecting a tracking error signal generating method based on information recorded in another information layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical disc in which a plurality of information layers of different optical disc standards are laminated on one disc and an optical disc apparatus for recording or reproducing information on the optical disc.

  In the field of information recording, research on optical disks has been conducted. This optical disc can be recorded and played back in a non-contact manner, can produce inexpensive large-capacity files, and has read-only, write-once, and rewritable media depending on the application. Widely applied to consumer use.

  Increasing the capacity of the above-mentioned various optical discs reduces the size of information written in a track on the disc, shortens the wavelength of the laser beam used as a light source for recording and reproduction, and provides an objective lens with a high numerical aperture Has been achieved by reducing the size of the focused spot on the focal plane.

  For example, in a CD (compact disc), the thickness of the disc substrate serving as a light transmission layer is about 1.2 mm, the laser beam wavelength is about 780 nm, the numerical aperture (NA) of the objective lens is 0.45, and the capacity is 650 MB. However, in a DVD (Digital Versatile Disc), the thickness of the disc substrate serving as a light transmission layer is about 0.6 mm, the laser beam wavelength is about 650 nm, and the NA is 0.6, and the capacity is 4.7 GB. It has become. For example, a DVD is used as a disk having a thickness of 1.2 mm by bonding two disk substrates having a thickness of about 0.6 mm.

  Further, in a high-density BD (Blu-ray Disc), an optical disc in which the thickness of the protective layer of the light transmission layer provided on the optical recording layer is reduced to 0.1 mm, the laser light wavelength is about 405 nm, and the NA is 0.1. By setting it to 85, a capacity increase of 23 GB or more is realized.

  As described above, various optical disk standards such as CD, DVD, and BD have been formulated while increasing the capacity of optical disks. On the other hand, the optical disk recording / reproducing apparatus is generally compatible so that it can record / reproduce optical disks of a plurality of standards.

  For example, in the case of a DVD recording / reproducing apparatus, there is a product that can perform CD recording / reproducing in addition to DVD recording / reproducing, and in the case of a BD recording / reproducing apparatus, BD recording / reproducing, DVD recording / reproducing, and CD recording / reproducing. There are products that can do this. These compatible recording / reproducing apparatuses are highly convenient because they can record / reproduce conventional standard optical discs owned by users, and play an important role in smoothly spreading the new standard.

These discs were compliant with the respective standards, but in order to improve the convenience for the user, optical discs in which information layers of a plurality of different optical disc standards are laminated on one disc have been developed. (For example, see Patent Document 1.)
JP 2004-95005 A

  In the optical disc as described above, it is unclear whether another information layer exists while accessing one information layer, so it is urgently necessary to read or record information in another information layer. In such a case, there is a problem that it takes time to access another designated information layer.

  In addition, in the optical disc as described above, since the type of one information layer is not recorded in another information layer, the information layer being accessed changes when reading and writing with a compatible optical disc apparatus corresponding to a plurality of optical disc standards. Each time the information layer is accessed and the type is read, it is necessary to select a method for generating a tracking error signal in accordance with the type of the information layer, and there is a problem that it takes time to access.

  In order to solve the above-described problems, an object of the present invention is to shorten an access time in an optical disc in which information layers conforming to a plurality of different optical disc standards are multilayered.

The present invention is an optical disc reproducing apparatus capable of reproducing an optical disc having an information layer conforming to the BD and CD standards, the BD and DVD standards, or the CD, DVD and BD standards,
The BD information layer of the optical disc has a management area in which information about CD and DVD information layers is held,
The optical disc playback apparatus has a means for accessing a management area of the BD information layer;
Means for extracting information relating to the CD or DVD information layer from the information in the management area of the BD information layer.

  According to the present invention, an access time can be shortened in an optical disc in which information layers conforming to a plurality of different optical disc standards are multilayered.

Embodiment 1 FIG.
1 to 3 are schematic diagrams showing the state of the optical disc and the optical disc apparatus accessing the information layer of the optical disc according to Embodiment 1 of the present invention, and FIG. 4 is a schematic showing the management area of the information layer L1 of the optical disc in FIG. FIG. FIG. 5 is a schematic diagram showing the data structure of the optical disc including the information field of the management area. FIG. 6 is a conceptual diagram of information fields in the management area. FIG. 7 is a schematic diagram of the information and the focused spot written in the track shape of the information layer L2, and FIG. 8 is a schematic diagram of the information and the focused spot written in the track shape of the information layer L3. FIG. 9 is a flowchart showing a sequence for reading the information of each information layer type. FIG. 10 is a flowchart showing a sequence for reproducing another information layer by using the information of each information layer type.

  Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. In FIG. 1, information layers L 1, L 2, and L 3 of different optical disc standards are provided on an optical disc 1 and are stacked in the thickness direction of the optical disc 1. The information layers L1, L2, and L3 are arranged in this order at positions where the distances from the surface to the information layer are 0.1 mm, 0.6 mm, and 1.2 mm, respectively. The information layers L1, L2, and L3 satisfy the BD, DVD, and CD optical disc standards in this order, the information layer L1 is the highest recording density, and the information layer L3 is the lowest recording density. And Here, the cases of the read-only type, the recordable type, and the read-only type will be described.

  The state of FIG. 1 shows a state in which the information layer L1 is accessed. The light beam 3a emitted from the blue-violet semiconductor laser light source 2a having the shortest wavelength of about 405 nm is converted into parallel light by the collimator lens 4a and is converted by the prism 5a. The light is reflected and focused on the information layer L1 by the objective lens 6 as a focused spot 7a.

  The light beam 3a reflected by the information layer L1 reenters the objective lens 6. Thereafter, the light passes through the prisms 5a, 5b, and 5c, and is irradiated onto the photodetector 9 by the sensor lens 8.

  The photodetector 9 photoelectrically converts the received light beam and outputs it to the signal processing means 10. The signal processing means 10 controls the amount of light emitted from the light source 2a, generates a tracking error signal indicating the relative position error between the focused spot and the information layer track, and sends the information after the signal processing to the video processing means 11. Output. The video processing means 11 performs video processing and outputs.

  The optical disk device 12 includes the light source 2 a to the video processing means 11, and records and reproduces information on the optical disk 1 according to instructions from the host 13. The host 13 is a personal computer (PC) that instructs the optical disc apparatus 12 to record and / or reproduce information. Also, a video / audio reproduction device that decodes information read by the optical disc device 12 and outputs video / audio, and / or a video that encodes externally input video / audio information and instructs the optical disc device 12 to record. An audio recording device may be used.

  The state in FIG. 2 shows a state in which the information layer L1 is accessed. The light beam 3b emitted from the red semiconductor laser light source 2b having a wavelength of about 650 nm is converted into parallel light by the collimator lens 4b, reflected by the prism 5b, and reflected by the objective lens. 6, the light is condensed on the information layer L1 as a condensed spot 7b.

At this time, the light beam 3b passes through the information layer L1. Therefore, the material and structure of the information layer L1 are set in consideration of physical characteristics such as transmittance and reflectance with respect to a light beam having a wavelength of about 650 nm so as not to affect access of the information layer L2.

  The light beam 3b reflected by the information layer L2 reenters the objective lens 6. Thereafter, the light passes through the prisms 5a, 5b, and 5c, and is irradiated onto the photodetector 9 by the sensor lens 8. Since the signal processing means 10 and the video processing means 11 perform the same operation, they are omitted. In FIG. 2, the signal processing means 10 controls the light source 2b.

  The state of FIG. 3 shows a state in which the information layer L1 is accessed. The light beam 3c emitted from the infrared semiconductor laser light source 2c having a wavelength of about 780 nm becomes parallel light by the collimator lens 4c, and is reflected by the prism 5c to be objective. The light is condensed as a condensing spot 7c on the information layer L1 by the lens 6.

  At this time, the light beam 3c passes through the information layers L1 and L2. Therefore, in order not to affect access of the information layer L3, the information layers L1 and L2 are set in materials and structures in consideration of physical characteristics such as transmittance and reflectance with respect to a light beam having a wavelength of about 780 nm.

  The light beam 3b reflected by the information layer L2 reenters the objective lens 6. Thereafter, the light passes through the prisms 5a, 5b, and 5c, and is irradiated onto the photodetector 9 by the sensor lens 8. Since the signal processing means 10 and the video processing means 11 perform the same operation, they are omitted. In FIG. 3, the signal processing means 10 controls the light source 2c.

  4 and 5, the management area 14 provided in the information layer L1 of the optical disc 1 is provided at the innermost peripheral position of the optical disc 1, and a user data area 15 is provided except for the management area 14. The information field 16 in the management area 14 has information indicating the type of each information layer. The information field 16 is read by the optical disk device 12 to obtain information indicating the type of each information layer.

  FIG. 6 is a conceptual diagram of the information field 16. Each area S1, S2, S3 in the information field 16 is a bit representing the type of the information layer L1, L2, L3, respectively. Regions S1, S2, and S3 are each composed of 2 bits, and a total of 6 bits are used. The bit is 01 when the information layer is a read-only type and 10 when the information layer is a recordable type. When there is no information layer, it is represented by 00. Therefore, areas S1, S2, and S3 in the first embodiment are recorded as 01, 10, and 01, respectively.

  FIG. 7 is a diagram showing information written in a track shape in which the information layer is a recordable type and the focused spot 7b. The recordable type has tracks called lands 17 and grooves 18. Information is recorded as a recording mark 19 using a chemical change or a shape change of the material. In the case of a recordable information layer, a known differential push-pull method (DPP method) is used to generate a tracking error signal. This is a method of dividing a luminous flux into three beams and condensing it on an information layer, receiving the reflected light with three two-divided photodetectors, and obtaining a tracking error signal.

  FIG. 8 is a diagram showing information written in a track shape in which the information layer is a read-only type and the focused spot 7c. In the reproduction-only type, information is recorded in a minute hole called a pit 20. In this case, a known differential phase detection method (DPD method) is used to generate the tracking error signal. This is a method in which a light beam is condensed on an information layer, and the reflected light is received and calculated by one quadrant photodetector to obtain a tracking error signal.

  In FIG. 9, when the optical disc 1 is inserted into the optical disc device 12 (ST1), the optical disc device 12 reads the information field 16 in the management area 14 in the information layer L1 on the optical disc 1 (ST2), Information indicating the type of each information layer L1, L2, L3 is obtained, the information is held in the signal processing means 10 (ST3), the process is terminated (ST4), and a standby state is waited for an instruction from the host 13.

  In FIG. 10, in response to a reproduction instruction for the information layer L2 from the host 13 (ST10), the optical disc apparatus 12 reads the type of the information layer L2 held in the signal processing means 10 as described above according to the sequence. (ST11). Since the information layer L2 is not a read-only type (FALSE in ST12) and is a recordable type (TRUE in ST13), the DPP method suitable for the recordable type information layer L2 is selected and at the same time suitable for the information layer L2. The laser power of the wavelength laser is set, a tracking error signal is generated (ST14), and information is reproduced from the information layer L2 (ST15).

  Similarly, in response to an instruction to reproduce the information layer L3 from the host 13 (ST10), the type of the information layer L3 held in the signal processing means 10 as described above is read according to the same sequence as in FIG. (ST11). Since the information layer L3 is a reproduction-only type (TRUE of ST12), a DPD method suitable for the reproduction-only information layer L3 is selected, and at the same time, the laser power of a laser having a wavelength suitable for the information layer L3 is set and tracking is performed. An error signal is generated (ST16), and information is reproduced from the information layer L3 (ST17).

In response to a reproduction instruction from the host 13, the type of the information layer L3 held in the signal processing means 10 is neither a reproduction-only type nor a recordable type (when both ST12 and ST13 are FALSE), and the optical disk apparatus If the information is unrecognizable, it returns to the host 13 that the information layer instructed to be reproduced is inaccessible (ST18), ends (ST19), and waits for the next instruction from the host 13.
In FIG. 10, any of steps ST12 and ST13 for determining whether the type of the information layer is the read-only type or the recordable type may be first.
Further, FIG. 10 shows the case where the host 13 issues a reproduction instruction. However, in the case where a recording instruction is issued, the information layer that has been instructed to record is similarly displayed based on the information indicating the type of information layer. On the other hand, the access time can be shortened and an appropriate recording operation can be performed.

In this embodiment, in an optical disc in which information layers conforming to a plurality of different optical disc standards are multilayered, information indicating the type of another information layer is recorded, so that the optical disc apparatus identifies the type of another information layer. It is easy to do and the access time can be shortened.
In addition, by recording this information in the management area of the information layer having the highest recording density, the information layer is expected to be used most frequently, so that the optical disc apparatus can reliably read and hold the information layer.
Further, when information is recorded on or reproduced from such an optical disc, the optical disc apparatus uses a laser power of a laser having a wavelength suitable for the layer to be accessed based on information indicating the type of the information layer in advance. It can be set to an appropriate value, and the access time can be shortened by predetermining the tracking error signal generation method that represents the relative position error in the direction crossing multiple tracks of the information written in a focused spot and track shape. it can.

Embodiment 2. FIG.
In the second embodiment of the present invention, FIGS. 1 to 5 and FIGS. 7 to 10 are the same as the first embodiment of the present invention, and the handling of the area in the management area in FIG. 6 of the first embodiment is different. ing.

  In FIG. 11, the optical disk is composed of a management area 14a located on the inner circumference side and a user data area 15a located on the outer circumference side, and information indicating the presence or absence of another information layer is recorded in the management area 14a. And a type area 22 in which information indicating the type of another information layer is recorded. In FIG. 12, areas T2 and T3 of the display area 21 record information indicating the presence or absence of the information layers L2 and L3 shown in FIG. Although the region T4 is not shown in the optical disc 1, the information layer conforms to other optical disc standards other than BD using a blue-violet semiconductor laser having a wavelength of about 405 nm as a light source, and other standards that will be developed in the future. Indicates the presence or absence of Each of the areas T2, T3, and T4 has a 1-bit information layer, and the display area 21 is configured with a total of 3 bits. Each bit represents 1 and 0 when the information layer is present and when it is absent.

  In FIG. 12, areas U2, U3, U4 of the type area 22 are associated with the information layers represented by the areas T2, T3, T4 of the display area 21, and information indicating the type of each information layer is recorded. It is an area that has been. That is, the areas U2, U3, and U4 represent the types of information layers when the information layers exist in the areas T2, T3, and T4 (bit 1), respectively. Each of the areas U2, U3, and U4 has 2-bit information, and the type area 22 is configured with a total of 6 bits. Each of the two bits is represented by 00 when the information layer is a read-only type, 01 when it is a write-once type, and 10 when it is a rewritable type. The write-once type includes DVD-R, + R, and their two-layer standards that can be additionally written but cannot be rewritten. Further, the rewritable type includes a DVD-RW and + RW double-layer standard and a DVD-RAM. When there is no information layer in any of the areas T2, T3, and T4 (bit 0), 00 corresponding to the reserve (preliminary area) is assigned to the corresponding areas U2, U3, and U4. In this case, the bits appear to be the same as when the information layer is a read-only type. However, if any of the areas T2, T3, and T4 is bit 0, the optical disk apparatus has corresponding areas U2, U3, and U4. Is not read, so there is no particular problem. Alternatively, bits other than the above (for example, 11) may be allocated.

When an optical disc is inserted, the optical disc apparatus reads the areas T2, T3, and T4 of the display area 21 in the management area 14a in the information layer L1 on the optical disc, thereby obtaining the information layers L2, L3 and other standards. Information indicating the presence or absence of a compliant information layer is obtained. Next, when the optical disk apparatus indicates the presence of the corresponding information layer among the areas T2, T3, and T4 (bit 1), it reads the areas U2, U3, and U4 of the type area 22 in the management information 14a, Information representing the type of the information layer is obtained, and the information is held in the signal processing means 10. The subsequent operation is the same as the flow shown in FIG.
Note that the optical disc apparatus reads only corresponding information from the areas U2, U3, U4 of the type area 22 only when the information obtained from the areas T2, T3, T4 indicates the presence of the information layer (bit 1). Can be designed to However, the information obtained from the areas T2, T3, and T4 may be designed to read all the areas U2, U3, and U4 of the type area 22 regardless of whether the information layer is present or not.

If there is an information layer corresponding to the region T4 and this information layer conforms to an optical disc standard other than BD using a blue-violet semiconductor laser having a wavelength of about 405 nm as a light source, the shortest wavelength is about 405 nm. A plurality of information layers (two information layers corresponding to the information layer L1 and the region T4) are included, but the display region 21 and the type region 22 are provided at least in the information layer L1. However, it may be provided on both the information layer corresponding to the region T4 as well as the information layer L1.
Further, the area T4 and the area U4 may be left without any special information as a reserve in case a new standard is formulated in the future. In this case, the display area 21 and the type area 22 hold information for the two types of information layers L2 and L3.

  Further, the 2 bits allocated to the area U2 corresponding to the DVD layer may be classified based on the structure type of the information track. In this case, classification can be made based on the periodic structure of the information track such as the wobble frequency. For example, it is 00 for a reproduction-only type such as a DVD-ROM with only prepits and no wobble, 01 for a DVD-R or DVD-RW with wobble, and a wobble frequency with a wobble frequency of DVD-R or DVD. 10 may be assigned for DVD + R or DVD + RW higher than −RW, and 11 may be assigned for a DVD-RAM in which the header is formed on the land / groove single spiral structure with a radial shift and no wobble exists. In the case of the DVD layer, since the periodic structure of the information track uses the same format for each classification, the characteristics of the wobble signal detection circuit (circuit for detecting the frequency of the periodic structure) such as a bandpass filter are accessed to the DVD layer. It is possible to set the speed before starting, and the disk rotation speed can be quickly controlled to the target value, and the access time can be shortened.

In this embodiment, in an optical disc in which information layers conforming to a plurality of different optical disc standards are multilayered, information indicating the presence or absence of another information layer is recorded, so that the optical disc apparatus identifies the presence or absence of another information layer. And the access time can be shortened.
Further, in addition to the display area 21 storing information indicating the presence or absence of another information layer, a type area 22 storing information indicating the type of information layer is provided in the management area of the optical disc. In association with the information in the area 22, the information in the display area 21 and the information in the type area 22 have a hierarchical structure. Therefore, in the future, when another area is provided in the management area 15 or when another type of information layer is added, it is possible to ensure extensibility using a hierarchical structure.

Further, by recording these information in the management area of the information layer having the highest recording density, the information layer is expected to be used most frequently, so that the optical disk apparatus can reliably read and hold the information layer. .
Furthermore, when recording or reproducing information on such an optical disc, the optical disc apparatus sets the laser power of a laser having a wavelength suitable for the layer to be accessed to an appropriate value based on the information as described above. The access time can be shortened by predetermining a tracking error signal generation method that represents the relative position error in the direction crossing a plurality of tracks of information that can be set and written in a track shape.

Embodiment 3 FIG.
The third embodiment is a mode in which there are at most two types of information layers including the type of the L1 layer in the optical disc 1. 1 to 5 and FIGS. 7 to 11 are the same as those of the second embodiment of the present invention, and the handling of the display area 21 and the type area 22 in FIG. 12 of the second embodiment is different.

In FIG. 13, areas T2, T3, T4 of the display area 21 are the same as those in FIG.
A region V1 of the type region 22 represents the type of another information layer when another information layer exists in addition to the information layer L1. The type area 22 has information of only 2 bits of the area V1. The two bits are represented by 00 when the information layer is a read-only type, 01 when it is a write-once type, and 10 when it is a rewritable type. The write-once type includes DVD-R, + R, and their two-layer standards. The rewritable type includes a DVD-RW and + RW double-layer standard, a DVD-RAM, and the like.
For example, when the information layer L1 is a recordable type consisting of one layer or two layers, the information layers L2 and L3 are both read-only types, and there are no other layers (T2 = 1, T3 = 1, T4 = 0) The region V1 is bit 00. In addition, when the information layer L1 is a reproduction-only type including one layer or two layers, the information layer L2 is a reproduction-only type, and no other layers exist (T2 = 1, T3 = 0, T4 = 0), the region V1 Becomes bit 00.

As described above, in the optical disc 1, when at least one of the areas T2, T3, and T4 of the display area 21 is the bit 1 and there is one kind of information layer indicating the bit 1, or among the areas T2, T3, and T4, When the area of bit 1 is only one layer, the type area 22 can be set to 2 bits, so that there is an effect of saving information bits as compared with the second embodiment. In particular, since only one of the information layers L2 and L3 exists and an optical disk using this layer as a reproduction-only type is expected to meet the needs of the market, the information layer L2 or L3 is an reproduction-only optical disk. In a situation where only the product is manufactured and sold, only 2 bits of the area V1 are sufficient for the type area 22.
As shown in the second embodiment, the region V1 may be classified based on the type of information track structure such as the presence or absence of wobble.

In the present embodiment, the case where the area V1 of the type area 22 is information of only 2 bits has been described, but information of only 1 bit may be used in order to further save information bits. In this case, for example, the reproduction-only type can be represented by 0, and other cases, that is, the write-once type or the rewritable type can be represented by 1. Alternatively, classification may be made based on the type of information track structure, such as 0 when there is no wobble and 1 when there is.
Furthermore, as described above, when the area V1 for storing information representing the information layer is set to 1 bit, the area T4 of the display area 21 in FIG. 13 is reserved and is used as a spare area without any special information. Since the area T4 is originally assigned as 1 bit, 1 bit of the area V1 which is information representing the information layer may be assigned to the area T4. In this way, information bits can be further saved, and the display area 21 and the type area 22 can be arranged adjacent to each other. As a result, the access time of the disk device can be further shortened.
Other effects are the same as those shown in the first and second embodiments.

Embodiment 4 FIG.
The type area 22 of the second and third embodiments can be assigned 00 or 0 as a reserve without assigning any particular information in consideration of future effective use of this bit. Further, as described in the third embodiment, in the situation where only the optical discs whose information layers L2 and L3 are read-only types are manufactured and sold, it is not necessary to assign information indicating the type of the information layer to the type area 22 in particular. Sometimes it is good.
However, in the future, if there is a change in the market such as not only optical discs whose information layers L2 and L3 are read-only types but also various mixed-type optical discs will be manufactured and sold, the bits of the type area 22 are set in the information layer. When it is necessary to use it to express the type, 00 or 0 assigned to the type area 22 is most frequently used in order to ensure compatibility with an optical disc in which the information layers L2 and L3 are read-only types. Assigned to the playback-only type. Even when this bit is used as a bit representing a completely different item, for the same reason, it is necessary to devise such that 00 or 0 assigned to the type area 22 is reserved.
In the case of the present embodiment, the information is only for the display area in which information indicating the presence / absence of another information layer is stored, but for the optical disc apparatus, it is possible to identify the presence / absence of another information layer. Therefore, it contributes to shortening of access time.

Embodiment 5. FIG.
FIG. 14 is a diagram showing the configuration of an inspection system that inspects the reproduction operation of the optical disc apparatus 1 that reproduces an optical disc in which a plurality of information layers of different optical disc standards described in Embodiments 1 to 4 are multilayered. The system shown in FIG. 14 includes an optical disc apparatus 100 to be inspected, a computer 200 connected to the optical disc reproducing apparatus, and a monitor 300 for displaying inspection results and the like. The computer 200 includes input means 400 such as a keyboard.

  The memory inside the computer 200 stores an inspection program for inspecting the reproduction operation of the optical disc apparatus 1. The computer 200 executes this inspection program and communicates with the optical disc apparatus 1, thereby The reproduction operation of the optical disc apparatus 1 is inspected. When the optical disc described in the first to fourth embodiments is inserted, the inspection of the optical disc apparatus 1 reads information on other information layers recorded in the management area of the information layer having the highest recording density, and the other information layers This is done by checking whether or not access can be made accurately.

  Hereinafter, a method for inspecting the disk reproducing apparatus in the inspection system according to the present embodiment will be described. Here, a case will be described in which an optical disc in which a BD-ROM layer and a DVD-ROM layer are formed into one disc is used as a test disc for reproduction operation (hereinafter referred to as “test disc”).

  First, a test disc is mounted on the optical disc device 1 to be inspected, and rotated at 1 × speed, and a flag indicating the type of each information layer recorded in the management area of the BD-ROM layer of the test disc is detected. In this case, if the optical disc apparatus 1 operates normally, information indicating that the other information layer is a DVD-ROM layer is detected. When information indicating that the other information layer is a DVD-ROM layer is detected, the computer 200 transmits a command to the optical disc apparatus 1 to access the other information layer. When the optical disc apparatus 1 normally accesses the DVD-ROM layer which is another information layer, the inspection is completed.

FIG. 15 is a flowchart showing details of the inspection process.
The computer 200 transmits a “disc start” command (step S101), and the optical disc apparatus 1 receives the command, rotates the disc, and discriminates (step S102). If the disc cannot be discriminated and the optical disc apparatus 1 outputs an error signal, the computer 200 displays “abnormal” on the monitor 300 as the inspection result (step S115).

When the disk discrimination operation is completed and the data read preparation is completed (step S103), the computer 200 transmits an “acquire management area information” command (step S104).
The optical disc apparatus 1 acquires information on the management area (step S105), and determines whether or not the type of information layer currently being accessed is a BD-ROM layer (step S106). When the flag indicating the BD-ROM layer is not detected from the management area information, the computer 200 displays “abnormal” on the monitor 300 as the inspection result (step S115).

  When the flag indicating the BD-ROM layer is detected from the information in the management area, it is determined from the flag indicating the type of the other information layer whether the other information layer is a DVD-ROM layer (step S107). When the flag indicating that the other information layer indicates the DVD-ROM layer is not detected from the information in the management area, the computer 200 displays “abnormal” on the monitor 300 as the inspection result (step S115). When a flag indicating that the other information layer is a DVD-ROM layer is detected, the computer 200 transmits a “DVD layer access” command (step S108).

In response to a command from the computer 200, the optical disc apparatus 1 performs an access operation to the DVD-ROM layer, and transmits an error signal to the computer 200 if the access operation is not performed normally (step S109). When the error signal is transmitted, the computer 200 displays “abnormal” on the monitor 300 as the inspection result (step S115).
When access to the DVD-ROM layer is completed normally and data read-out preparation is completed (step S110), the computer 200 transmits a “management area information acquisition” command to the optical disc apparatus 1 (step S111).

The optical disc apparatus 1 acquires information on the management area (step S112), and determines whether or not the type of the information layer currently being accessed is a DVD-ROM layer (step S113). When the flag indicating the DVD-ROM layer is not detected from the information in the management area, the computer 200 displays “abnormal” on the monitor 300 as the inspection result (step S115).
When the flag indicating the DVD-ROM layer is detected from the information in the management area, the computer 200 displays “no abnormality” on the monitor 300 as the inspection result (step S114), and the inspection is completed.

  According to the inspection method of the optical disk device described above, whether or not the optical disk device can perform a normal reproduction operation when an optical disk having a plurality of information layers conforming to different optical disk standards is inserted. Can be automatically inspected.

3 is a schematic diagram showing a state of an optical disc device accessing the optical disc and the information layer L1 of the optical disc in the first embodiment. 2 is a schematic diagram showing a state of an optical disc apparatus accessing the optical disc and the information layer L2 of the optical disc in the first embodiment. 3 is a schematic diagram showing a state of an optical disc device accessing the optical disc and the information layer L3 of the optical disc in the first embodiment. 6 is a schematic diagram showing a management area of an information layer L1 of the optical disc in the first embodiment. FIG. FIG. 3 is a schematic diagram showing a data structure of an optical disc including a management area information field in the first embodiment. 6 is a conceptual diagram of information fields in a management area in Embodiment 1. FIG. FIG. 3 is a schematic diagram of information written in a track shape of the information layer L2 and a focused spot in the first embodiment. FIG. 3 is a schematic diagram of information written in a track shape of the information layer L3 and a focused spot in the first embodiment. FIG. 3 is a flowchart showing a sequence for reading information of each information layer type in the first embodiment. FIG. 6 is a flowchart showing a sequence for reproducing another information layer using information on the type of each information layer in the first embodiment. 6 is a schematic diagram showing a management area of an information layer L1 of an optical disc in a second embodiment. FIG. FIG. 10 is a conceptual diagram in a management area in the second embodiment. FIG. 11 is a conceptual diagram in a management area in the third embodiment. FIG. 10 is a block diagram illustrating a configuration of an inspection system for an optical disc device according to a fifth embodiment. 10 is a flowchart showing an inspection process in an inspection system for an optical disc device according to a fifth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Optical disk, 2a Blue violet semiconductor laser light source, 2b Red semiconductor laser light source, 2c Infrared semiconductor laser light source, 3a Luminous flux of blue violet semiconductor laser light source, 3b Luminous flux of red semiconductor laser light source, 3c Luminous flux of infrared semiconductor laser light source, 4a 4b, 4c collimating lens, 5a, 5b, 5c prism, 6 objective lens, 7a condensing spot of blue-violet semiconductor laser light source, 7b condensing spot of red semiconductor laser light source, 7c condensing spot of infrared semiconductor laser light source, 8 sensor lens, 9 light detector, 10 signal processing means, 11 video processing means, 12 optical disk device, 13 host, 14, 14a management area, 15, 15a user data area, 16 information field, 17 lands, 18 groove, 19 Record mark, 20 pits, 21 display area, 2 Type region, 100 an optical disk apparatus, 200 computer, 300 monitor

Claims (3)

An optical disc reproducing apparatus capable of reproducing an optical disc having an information layer conforming to a BD and CD standard, a BD and DVD standard, or a CD, DVD and BD standard,
The BD information layer of the optical disc has a management area in which information about CD and DVD information layers is held,
The optical disc playback apparatus has a means for accessing a management area of the BD information layer;
Means for extracting information relating to the CD or DVD information layer from the information in the management area of the BD information layer. The optical disk reproducing apparatus according to claim 1, wherein access to the CD or DVD information layer is performed based on information about the CD or DVD information layer extracted from information in a management area of the BD information layer. Optical disk playback device. 2. The optical disk reproducing apparatus according to claim 1, further comprising a plurality of laser light sources that emit laser beams condensed on each of the CD, DVD, and BD information layers.

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