JP2002367171A - Optical disk discriminating method and optical disk discriminating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk discriminating method and optical disk discriminating system capable of correctly discriminating an HL disk in addition to a CD, DVD-SL and DVD-DL. SOLUTION: The optical disk is discriminated to be the CD when the frequency of signal peaks during a moving period of a pickup 31 is twice and the intervals of the signal peaks of the first time and the second time are greater than a prescribed value; the optical disk is discriminated to be the DVD-SL when the frequency of the signal peaks is twice and the intervals of the signal peaks of the first time and the second time are smaller than the prescribed value; the optical disk is discriminated to be the HL when the frequency of the same is thrice and the intervals of the signal peaks of the second time and the third time are greater than the prescribed value; and the optical disk is discriminated to be the DVD-DL when the frequency of the signal peaks is twice and the intervals of the signal peaks of the second time and the third time are smaller than the prescribed value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc discriminating method and an optical disc discriminating apparatus.

[0002]

2. Description of the Related Art In general, as a medium for distributing electronic data such as software and image contents, an optical disk called a compact disk (CD), which is a disc having a diameter of 12 cm and has a data capacity of 650 MB, is frequently used. There are various other types of CDs such as a CD having a diameter of 8 cm (data capacity of 128 MB), a card type and a barrel type, etc.
Since it is a disc having the size of cm, a CD will be referred to as this mainstream type in the following description.

A CD has a so-called CD-ROM produced as a mechanical copy of a master disk and a so-called CD-ROM having a recording layer made of a special dye inside the disk, and irradiating the recording layer with a laser beam to write data. CD-R
(Or overwritable CD-RW).

[0004] Furthermore, an optical disk includes a DVD (Digital Versatile Di) having a larger capacity.
sc). This DVD is also a data read-only DVD-ROM and a data writable DVD-RAM.
However, the latter DVD-RAM has a recording layer made of a special dye inside the optical disk, and the above-described CD-R is different in that the recording layer is irradiated with laser light to write data.
(Or overwritable CD-RW).

When data is recorded or reproduced using optical disks of various types, it is necessary to use optical disks of a type suitable for the recording device and the reproducing device. Since both of the external shapes were discs having a size of 12 cm, it was difficult to distinguish them, and an artificial selection error could not be denied.

Therefore, Japanese Patent Laid-Open No. 2000-311427 describes an "optical disc discriminating method and apparatus" that enables the type of CD or DVD to be discriminated mechanically and that avoids an artificial selection error. I have.

FIGS. 11A and 11B are diagrams showing the structure of an optical disc described in the publication, wherein FIG. 11A shows the cross-sectional structure of a CD, and FIGS. CD1, DVD2 and DVD3 have the same disk thickness α (α = 12 m
m), and the recording layer 4 of the CD 1 has a disc surface 5
And the distance from the disk surface 5 to the recording layer 4 is substantially equal to the disk thickness α.
Is equivalent to

On the other hand, the recording layers of DVD2 and DVD3 have a single-layer structure (single layer; hereinafter abbreviated as "SL") and a multi-layer structure (dual layer; abbreviated as "DL"). Hereinafter, “SL” and “DL” are added to DVD2 and DVD3, respectively,
In the case of VD-DL3, the recording layer 7 of the DVD-SL2 is located at approximately the middle (α / 2) in the disk thickness direction, and the distance from the disk surface 8 to the recording layer 7 is almost の of the disk thickness α. DVD-DL
The recording layers 9 and 3 are located almost at the center (α / 2) in the disk thickness direction, and the distance from the disk surface 11 to the recording layers 9 and 10 is almost 1/1 / the disk thickness α.
Equivalent to 2. Note that the recording layers 4 and 7 in FIG.
It should be noted that the thicknesses 9 and 10 and their positions are deformed from actual ones for convenience of illustration. An important point to be read from the drawing is the position of each of the recording layers 4, 7, 9, and 10, as described above.

FIG. 12 shows CD1, DVD-SL2 and D
FIG. 3 is a diagram showing an irradiation state of a laser beam on VD-DL3 and a reflection characteristic diagram of the laser beam. In this figure, an optical disk 12 is a CD1, DVD-SL2 or DVD-DL.
3.

The optical disk 12 is driven to rotate by a motor (not shown), and while irradiating the laser light 14 from the pickup 13 on the disk surface 12a of the optical disk 12, the pickup 13 is moved closer to the optical disk 12 at a constant speed. When the reflected light from the optical disk 12 is received by the pickup 13 and its signal waveform is plotted,
As shown in (b), the type of the optical disk 12 (CD1,
A signal waveform corresponding to DVD-SL2 or DVD-DL3) is obtained.

That is, when the optical disk 12 is the CD 1, the laser beam 14 is focused on the disk surface 5 and the recording layer 4 in FIG. , And signal peaks 15 and 16 appear at two points where P0 is the position of the recording layer 4 and P2 is the position of the recording layer 4.

When the optical disk 12 is a DVD-SL2, the disk surface 8 shown in FIG.
Since the laser beam 14 is focused at two points of the recording layer 7 and the recording layer 7, signal peaks 17 and 18 appear at two points where the position of the disk surface 8 is P0 and the position of the recording layer 7 is P1.

Further, the optical disk 12 is a DVD-DL3
In this case, since the laser beam 14 is focused at three places of the disk surface 11 and the recording layers 9 and 10 in FIG.
Signal peaks 19 to 21 appear at three points where the positions of 0 are P1a and P1b.

The technique disclosed in the above publication focuses on the peculiarity of the signal waveform according to the kind of the optical disc, and the gist of the technique is “reflection from the surface of the optical disc (disc surface)”. An optical disc is determined by measuring the time (time difference) between the signal and the reflected signal from the recording surface (recording layer), and determining whether the measured value is “greater or smaller than a predetermined value”. It is.

When this is applied to the signal waveform of FIG. 12B, the time difference T2 between the two signal peaks 17 and 18 of the DVD-SL2 is compared with the time difference T1 between the two signal peaks 15 and 16 of the CD1. Is approximately 1/2 (T2 = T1 /
2), by setting an appropriate threshold value smaller than T1 and larger than T2 in advance, CD1
Can be distinguished from the signal waveform of DVD-SL2. For DVD-DL3, DVD
Although the time difference T2 is equal to that of -SL2, since the number of signal peaks is three, the DVD
-SL2.

[0016]

However, the technique described in the above publication is useful in that three types of optical disks such as CD1, DVD-SL2 and DVD-DL3 can be distinguished. However, another type of optical disk, for example, an optical disk called a hybrid optical disk cannot be determined.

FIG. 13 is a structural diagram of a hybrid optical disk (hereinafter, referred to as “HL disk” or simply “HL”). The HL disk 22 has a first recording layer 23 corresponding to the recording layer 7 of the DVD-SL2 and a second recording layer 24 corresponding to the recording layer 4 of the CD1.
Is located approximately α / 2 from the disk surface 25, and the second recording layer 24 is located approximately α near the jacket printing surface 26. It should be noted that the thicknesses and positions of the recording layers 23 and 24 in FIG. 13 are deformed from actual ones for convenience of illustration. An important point to be read from the drawing is that, as described above, the recording layer 2
3, 24, respectively.

HL disk 22 having such a structure
12A is irradiated with laser light 14 in the same manner as in FIG.
5, signal peaks 27 to 28 appear at three places of the first recording layer 23 and the second recording layer 24. Here, the time difference from the first signal peak 27 to the third signal peak 29 is T1
And the time difference between the first signal peak 27 and the second signal peak 28 is T2.

Therefore, when this HL disk 22 is added to the determination target of the technique described in the above publication, it is erroneously determined to be CD1 due to the time difference T1 from the first signal peak 27 to the third signal peak 29. In addition, the time difference T2 from the first peak 27 to the second peak 28 may cause the DVD-SL2 to be erroneously determined to be a DVD-SL2, resulting in two incorrect determinations. is there.

Therefore, an object of the present invention is to provide an optical disc discriminating method and an optical disc discriminating apparatus which can correctly discriminate an HL disc.

[0021]

According to the present invention, a pickup for irradiating a laser beam onto a disk surface of an optical disk and receiving the reflected light is moved at a constant speed in one direction along the vertical direction of the disk surface. Converting the reflected light received by the pickup into an electric signal, and determining the type of the optical disc based on the time-series appearance of signal peaks included in the electric signal; In the case where the number of appearances of the signal peak is 2 times and the interval between the first and second signal peaks is larger than a predetermined value, the optical disc is determined to be of the first type, while the number of appearances is 2 times and If the interval between the first and second signal peaks is smaller than a predetermined value, the optical disk is determined to be of the second type, and the number of appearances is three and the second and third signals are used. If the gap between the peaks is larger than the predetermined value, the optical disc is determined to be of the third type. On the other hand, if the number of appearances is three and the interval between the second and third signal peaks is smaller than the predetermined value, The optical disk is determined to be the fourth type.

Alternatively, if the number of appearances of the signal peak during the movement period of the pickup is two and the interval between the first and second signal peaks is larger than a predetermined value, the optical disk is determined to be of the first type. On the other hand, if the number of appearances is two and the interval between the first and second signal peaks is smaller than a predetermined value, the optical disc is determined to be of the second type. If the interval between the second and third signal peaks is larger than a predetermined value, the optical disc is determined to be of the third type, while the number of appearances is three and the interval between the second and third signal peaks is predetermined. If the value is smaller than the value, or if the number of appearances is two and the magnitude of the second signal peak is smaller than the predetermined value, the optical disc is determined to be the fourth type.

According to the present invention, the type of the optical disk is changed to the first type, the second type, the third type, or the fourth type according to the number of appearances of the signal peak and the interval between the signal peaks during the movement period of the pickup. Is determined.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A is a schematic system configuration diagram of an optical disk reproducing apparatus or a combined reproducing / recording apparatus to which the present invention is applied. Pickup 31
The optical disk 33 is irradiated with the laser light 32, the reflected light is converted into an electric signal 34 and output to the signal processing unit 35. The signal processing unit 35 performs a waveform shaping process, a noise removal process, a digital conversion process, and the like on the electric signal 34 and
6, and outputs an information signal 37 indicating the signal peak position and the magnitude of the signal peak on the time axis of the electric signal 34, and outputs the information signal 37 to the control unit 38. I do.

The control section 38 has functions as movement control means, discriminating means and first to fourth discriminating means described in the gist of the invention. For example, when the optical disc 33 is set, A predetermined process (hereinafter, referred to as "optical disc discrimination process") for discriminating the type of is performed. The optical disc discriminating process includes a first step of outputting a predetermined control signal 40 to the drive unit 39, and the information signal 3
A second step of discriminating the type of the optical disc 33 based on 7 and outputting the discrimination result.

The control signal 40 in the first step is a signal for moving the pickup 31 at a constant speed along the vertical direction of the disk surface of the optical disk 33. The moving direction may be a direction to approach the disk surface or a direction to move away from the disk surface. Hereinafter, for convenience of description, the moving direction is referred to as “approaching direction”.

The pickup 31 moves during the first step.
While moving at a constant speed from the farthest position to the closest position along the vertical direction of the disk surface of the optical disk 33, the laser beam 32 is applied to the optical disk 33 while the reflected light from the optical disk 33 is electrically transmitted. Signal 34
And output. In the second step, while taking in the information signal 37 during the first step, two pieces of information included in the information signal 37, that is, the position of the signal peak on the time axis of the electric signal 34 and the magnitude of the signal peak Is recorded and held, and the type of the optical disk 33 is determined by a predetermined algorithm (details will be described later) based on the recorded and held information at the end of the first step, and the determination result is output.

FIG. 1B is a conceptual functional block diagram of the control unit 38. The pickup movement control unit 38a generates and outputs the control signal 40, that is, a signal for moving the pickup 31 at a constant speed along the vertical direction of the disk surface of the disk 33. The focus number counting unit 38b counts the number of signal peaks on the time axis of the electric signal 34 included in the information signal 37,
The count value is recorded and held. The focus position detector 38c records and holds the signal peak position on the time axis of the electric signal 34 included in the information signal 37. Further, the optical disc discriminating section 38d performs a predetermined algorithm based on the information held by the focus number counting section 38b and the focus position detecting section 38c by using a predetermined algorithm.
And outputs the result of the determination.

Here, the predetermined algorithm will be described. FIG. 2 shows the pickup 3 during the first process.
1 is a moving state diagram of FIG. This figure shows the laser beam 3
2 indicates three positions (a to c) at which focus is achieved. First
Is the surface (disc surface) of the optical disk 33, and this position P0 always appears regardless of the type of the optical disk 33. Further, the second position P1 and the third position P2 correspond to the positions of the recording layers provided inside the optical disk 33, and the structural diagrams of the various optical disks described at the beginning (see FIGS. 11 and 13A). Thus, the second position P1 is DVD-
Appears in the case of SL or DVD-DL or HL, and the third position P2 appears in the case of CD or HL.
However, in the case of DVD-DL, the second position P1
12 and a position P1b of a second position P1b corresponding to the position 2a and a position P1b of a second position substantially the same as the position 2a (FIG. 12)
(B)).

Here, assuming that the thickness of the optical disk 33 is α with reference to the first position P0, the second position P1 (and the positions P1a and P1b of the 2a and 2b) is the disk thickness α.
And the third position P2 is substantially equal to the disk thickness α. Looking at this by a time difference, the time difference between the first position P0 and the second position P1 (or the position P1a of the second a and the position P1b of the second b) is T2, and the first position P0 and the third position P2 are the same. Is T1, and T2 <T1. In terms of the number of focuses (the number of focuses), CD
2 times (P0, P2) for DVD-SL, 2 times (P0, P1) for DVD-SL, and 3 times (P0, P1) for DVD-DL.
0, P1a, P1b) and HL, three times (P0, P2).

The predetermined algorithm according to the present embodiment determines the type of the optical disk 33 based on the above-described signal peak position relationship and signal peak time difference relationship between a CD and a DVD-ROM.
It is determined as SL, DVD-DL or HL.

FIG. 3 is a diagram showing the algorithm, and is a diagram showing a control operation (first step and second step) in the control section 38 in a flowchart. In the figure, first, the pickup 31 is set to an initial position (step S11). The initial position is pickup 3
When moving 1 in a direction to approach the optical disc 33, it refers to the farthest position where the movement is started. Alternatively, when the pickup 31 is moved in a direction away from the optical disk 33, it means the latest position where the movement is started.

When the pickup 31 is set at the initial position, the focus counter is initialized to 0 and the focus table is cleared (step S1).
2) The pickup 31 is moved by a predetermined amount (step S13). The predetermined amount is, for example, a minute amount corresponding to one step angle or several step angles of the motor when the pickup 31 is moved by a stepping motor.

Next, after moving by a predetermined amount, the information signal 37 from the signal processing unit 35 is examined to determine whether or not a signal peak is included. In other words, the laser beam emitted from the pickup 31 Then, it is determined whether or not a large reflected light is observed after focusing (step S14).

If the focus is achieved, the focus counter is incremented by one and updated (step S16), and the focus position is recorded in the focus table (step S17). Is determined (step S15).

On the other hand, if not in focus, it is determined whether or not the pickup 31 has reached the movement limit position (step S15). If not, the pickup 31 is moved again by a predetermined amount. After the movement, the presence or absence of focus is determined. If the movement limit has been reached, the pickup 31 is returned to the original position, the first step is completed, and the determination processing of the second step is executed (step S18). Then, the flow ends.

FIG. 4 is a diagram showing the discriminating process in step S18. In this discriminating process, the information (the value of the focus frequency counter and the recorded content of the focus table) obtained in the first step is added to the type of the optical disc 33. (CD, DVD
-SL, DVD-DL, HL) are applied to determine the type (step S18a), and the result of the determination is output (step S18b).

Here, the list 42 in the figure is a list in which judgment criteria are arranged in an easy-to-understand manner. In the list 42, the focusing times of the CD, DVD-SL, DVD-DL, and HL are “2 times”, “2 times”, “3 times”, and “3”, respectively.
Times ”, and the in-focus positions are“ P0, P2 ”and“ P
0, P1 "," P0, P1a, P1b ", and" P0, P1, P2 ". According to the list 42, it can be seen that there is a clear difference between the number of times of focusing and the focusing position depending on the type of the optical disc.

That is, the condition for judging the CD is that the value of the focus counter is "2" and the recorded contents of the focus table are "P0, P2", and the DVD-S
The judgment condition of L is that the value of the focus counter is “2”.
And the recorded contents of the focus table are "P0, P
1 ". The DVD-DL determination condition is as follows:
This is a case where the value of the focus number counter is “3” and the recorded contents of the focus table are “P0, P1a, P1b”, and the HL determination condition is that the value of the focus number counter is “3” and This is a case where the recorded contents of the focus table are “P0, P1, P2”. By applying these determination conditions, CD, DVD-SL, DVD-D
Any of L and HL can be correctly determined.

Therefore, according to the present embodiment, C
D, DVD-SL and DVD-DL can be discriminated, and HL can also be discriminated. Thus, it is possible to provide an optical disc discriminating method and an optical disc discriminating apparatus which have solved the disadvantages of the related art at the beginning. .

Next, as a specific application example of the present invention, an embodiment using an optical disk production system as an example will be described.
FIG. 5 is an overall configuration diagram of an optical disk production system (hereinafter, referred to as a production system). In this example, the production system 43 includes a general-purpose personal computer (hereinafter, referred to as a personal computer) 50 and an optical disk recording device 60.
And a tape reproducing device 80, and the personal computer 5
In response to the instruction from 0, the data of the master tape TAP set in the tape reproducing device 80 is reproduced, and the reproduced data is sent to the optical disk recording device 60 via the personal computer 50, and the optical disk set in the optical disk recording device 60 is transmitted. Record on DSK.

Here, the data recorded on the master tape TAP is for CD, DVD-SL, DVD-DL or HL. In the case of DVD-DL, the PFI (Phys) formed in the header of the master tape TAP is used.
ical Format Information) and the information (DVD-DL)
(Information that specifies that the data is for use). In the case of HL, the MTOC (Table of Contents) formed in the header of the master tape TAP
To the information (information indicating that it is HD data)
Is recorded. By reading the PFI information and the MTOC information of the master tape TAP by the tape reproducing device 80, the data recorded on the master tape TAP can be converted to the DV format.
Whether it is for D-DL or HD can be checked.

On the other hand, the type of the optical disk DSK to be set in the optical disk recording device 60 is the master tape TAP.
However, as described above, optical discs such as CDs, DVD-SLs, DVD-DLs, and HLs are difficult to distinguish from each other in appearance. The optical disk DSK may be set. In this case, since it is known that the optical disk is incompatible due to the occurrence of a writing error or the like after the start of data recording, resources (optical disk) are wasted due to writing failure of the disk, and a smooth optical disk is obtained by performing data recording again. There is an inconvenience that it hinders production.

Therefore, in the production system 43, by applying the technology of the present invention to the optical disk recording device 60 (therefore, the optical disk recording device 60 has a function as an optical disk discriminating device described in the gist of the invention). .), The type of the optical disk DSK set in the optical disk recording device 60 can be grasped in advance by the personal computer 50, and if an incompatible optical disk DSK is set, a necessary warning is given to the operator before data recording. Therefore, it is an object of the present invention to avoid wasting resources and enable smooth optical disc production.

The details will be described below.
Is composed of a display 51, a main body 52, a keyboard 53, a mouse 54 and the like. The optical disk recording device 60 includes a main body 61, an optical disk discharge button 62, an optical disk insertion slot 63, various operation buttons 64, a display section 65, and the like provided on the main body 61. Further, the tape reproducing device 80 includes a main body 81, a tape discharge button 82, a tape insertion slot 83, various operation buttons 84, a display section 85, and the like provided on the main body 81.

FIG. 6 is an electrical simplified block diagram of each of the personal computer 50, the optical disk recording device 60, and the tape reproducing device 80. In this figure, the personal computer 50
Connects peripheral resources such as a display 51, a keyboard 53 and a mouse 54 to a CPU 52a of a main body 52, and further connects internal resources such as a RAM 52b, a ROM 52c, a first interface (I / O) 52d and a second interface 52e. It is configured.
Needless to say, this configuration does not accurately represent the actual configuration of the personal computer. For example, the peripheral resources and the internal resources are not actually connected directly to the CPU 52a, but are indirectly connected via an interface for each resource type.

The personal computer 50 having such a configuration can be
A software resource (operating system and application program for controlling the production system 43) stored in the M52c (or an external storage device (not shown)) is loaded into the RAM 52b and executed by the CPU 52a, and a required user interface screen is displayed on the display 51. I do. By operating the keyboard 53 and the mouse 54 while interacting with the screen, the user can control the overall centralized operation of the production system 43 and monitor the operation.

The optical disk recording device 60 includes a pickup 66, a mechanical controller 68, various operation buttons 6
4, display unit 65, CPU 69, RAM 70, ROM 71
And an interface 72. When recording data, the personal computer 5
The data input from 0 is sent from the CPU 69 to the pickup 66, the laser light 67 is modulated by the pickup 66, and the modulated laser light 67 forms a physically deformed portion (so-called pit) on the recording layer of the optical disk DSK. Thus, data is written.

On the other hand, the tape reproducing device 80
6, a mechanical controller 87, various operation buttons 84, a display unit 85, a CPU 88, a RAM 89, a ROM 90, an interface 91, and the like. When data is reproduced, the CPU 8 responds to a reproduction request from the personal computer 50.
8 controls the mechanical controller 87 and the master tape T
The AP is rotated, and the master tape T is rotated by the head 86.
The data read from the AP is output to the personal computer 50 via the interface 91.

The personal computer 50 controls the operations of the optical disk recording device 60 and the tape reproducing device 80. For example, it instructs the tape reproducing device 80 to start reproduction of the master tape TAP, and instructs the optical disk recording device 60 to start recording data on the optical disk DSK. Prior to these instructions, the personal computer 50 sets the optical disk DSK set in the optical disk recording device 60.
Is checked to see if it is of a type suitable for the master tape TAP set in the tape playback device 80, and if not, a message is displayed on the display 51 indicating that the optical disk DSK should be replaced with an appropriate type of optical disk DSK. .

The optical disk recording device 60 determines the type of the optical disk DSK by the CPU 69 (therefore, the CPU 69 determines the movement control means, the determination means, and the first to fourth types described in the gist of the invention). It has a function of outputting the result of the determination to the personal computer 50 via the interface 72, and details thereof are as follows.

First, when the optical disk DSK is set or when the personal computer 50 requests a disk determination, the CPU 69 executes the disk determination program (see FIGS. 3 and 4) stored in the ROM 71 by RA.
Load to M70 and execute. Thereby, the CPU 69
Starts the first step, sets the pickup 66 at the initial position by controlling the mechanical controller 68,
While moving the pickup 66 by a predetermined amount, the reflected light of the laser beam 67 from the optical disk DSK is picked up by the pickup 66.
And records and holds the peak position and the number of peaks of the received light signal.

When the pickup 66 reaches the movement limit position and completes the first step, the second step is executed, and based on the peak position and the number of peaks recorded and held during the execution of the first step, the aforementioned step is performed. (See step S18a in FIG. 4), the type of the optical disc DSK is
It discriminates whether it corresponds to CD, DVD-SL, DVD-DL or HL, and outputs the discrimination result to the personal computer 50.

FIG. 7 is a flowchart showing the operation of the personal computer 50. First, the personal computer 50 requests the tape reproducing device 80 to report the set state of the master tape TAP (step S21). If the response indicates that the master tape TAP is not set, the display 51 displays the master tape TAP. Is displayed (step S22). The user presses an OK assignment key (eg, “Enter” key) on the keyboard 53 when confirming the setting of the master tape TAP, or a cancel assignment key (eg, “E”) on the keyboard 53 when stopping the disc production.
sc ”key). The personal computer 51 identifies the key operation event (step S23). If the key operation event is an OK key, the personal computer 51 sends the master tape TAP to the tape reproducing device 80 again.
Is requested, and if it is the cancel key, the process is terminated.

If the response from the tape reproducing device 80 indicates that the master tape TAP has been set, the personal computer 50 transmits a disk identification request to the optical disk recording device 60 (step S24), and the response is a CD. ,
It is determined which of DVD-SL, DVD-DL and HL is indicated (step S25). If neither type is indicated, a required error message (for example, "Please insert a proper disc") is displayed on the display 51 (step S26), and a key event of the keyboard 43 is determined. (Step S2
7) If the OK key is pressed, a disc discrimination request is transmitted to the optical disc recording device 60 again (step S).
24) If the cancel key is pressed, the process ends.

The response from the optical disk recording device 60 is C
D, DVD-SL, DVD-DL, or HL, the personal computer 50
0 is output as a data type request (step S2).
8) Then, the response is compared with the above response from the optical disk recording device 60 (step S29). Then, a response from the tape reproducing device 80 (that is, the master tape T
The type of data recorded in the AP) and the response from the optical disk recording device 60 (ie, the type of the optical disk DSK)
If a match is determined, a predetermined match message (for example, "Compare OK") is displayed on the display 51.
Is displayed (step S30) to end the processing, or
If a mismatch is determined, a predetermined mismatch message (eg, “Compare NG”) is displayed on the display 51.
Is displayed (step S31), and the process ends.

FIG. 8 is a flowchart showing the operation of the tape reproducing device 80. Tape playback device 8 after starting operation
0 is in a command waiting state from the personal computer 50 (or various operation buttons 84) (step S61), and until a command input is detected (“YES” in step S62),
I keep that waiting state.

When an arbitrary command is detected, the tape reproducing device 80 determines the type of the command (step S63), and performs an operation according to the type of the command. For example, if the command type is "Check Tape", the setting state of the master tape TAP is checked, the result is returned to the command source (for example, the personal computer 50) (step S64), and the process is terminated. Alternatively, if the command type is "Eject Tape", the setting state of the master tape TAP is checked, and if the master tape TAP is set, the master tape TAP is ejected (step S65) and the process ends.

Alternatively, if the command type is “Read Ta”
In the case of "pe", first, "TapeExist" is checked (step S66), and if the result is "NO", the command source is notified of the absence of the tape (step S67), and the process is terminated. If the result is "YES", the tape is rewinded (step S68).
To read the PFI of the tape header portion (step S69), check whether or not the DL information (“0x01”) has been written in the PFI (step S70). If the DL information has been written, the tape type = “ DL ”is returned to the command request source (step S71), and the process ends.

On the other hand, if the DL information has not been written in the PFI, the MTOC of the tape is read next (step S72), and the SL information (“0x0
0 ") is written (step S7).
3) If the SL information is written, the tape type = “S
"L" is returned to the command request source (step S74), and the process is terminated. If the SL information is not written, the tape type = "HL" is returned to the command request source (step S7).
5) End the process.

FIG. 9 is a flowchart showing the operation of the optical disk recording device 60. After the operation starts, the optical disk recording device 60 operates the personal computer 50 (or the various operation buttons 6).
Waiting for command from 4) (step S4)
1) Until a command input is detected ("YES" in step S42), the waiting state is kept.

When an arbitrary command is detected, the optical disk recording device 60 determines the type of the command (step S43), and performs an operation according to the type of the command. For example, if the command type is "tray open", the disc insertion slot 63 is opened and the disc tray is ejected (step S44), and the process is terminated. Alternatively, if the command type is "tray close", the disc tray is pulled in and the disc insertion slot 63 is closed (step S45), and the process ends.

Alternatively, when the command type is “Check”, first, an effective optical disk DS
It is checked whether or not K is set (step S4).
6) If not set or an invalid disk is set, a message indicating that (for example, “no disk” or “invalid disk”) is sent to the command source (for example, personal computer 50). (Step S47), and the process ends.

When a valid disk is set on the disk tray, the first and second steps described above are executed to measure and record the number of signal peaks of reflected light from the optical disk DSK and the time interval between peaks. If the number of peaks is three, the disk type = "HL" is returned to the command source (the personal computer 50) (step S49), and the process is terminated. The time difference between the first signal peak and the second signal peak is compared with a predetermined value (Tth) (step S50). If the time difference is larger than the predetermined value, the disc type = “CD” is determined by the command source ( (Step S)
51) End the process.

Alternatively, if the time difference is not larger than the predetermined value, the magnitude of the second signal peak is compared with a predetermined value (Rth) (step S52), and the magnitude of the second signal peak is determined. Is larger than the predetermined value, the disk type = “SL” is returned to the command source (the personal computer 50) (step S53), and the processing is terminated. If the magnitude of the second signal peak is not larger than the predetermined value, , The disk type = “DL” is returned to the command source (the personal computer 50) (step S54), and the process is terminated.

Here, in this flowchart,
When the number of signal peaks is three, the optical disc discrimination result is set to “HL”, and when the number of signal peaks is two,
The interval between the first and second signal peaks is a predetermined value (Tt).
h) and when the magnitude of the second signal peak is greater than a predetermined value (Rth), the optical disc discrimination result is set to “SL”, and when the number of signal peaks is two, When the interval between the second and the second signal peaks is smaller than a predetermined value (Tth) and the magnitude of the second signal peak is smaller than a predetermined value (Rth), the optical disc discrimination result is set to “DL”. .

This determination algorithm (〜) is different from that of the above-described embodiment (algorithm based on the list 42 in FIG. 4), for the following reason.
Indeed, as shown in FIG.
Although the number of signal peaks of L is three times, the second and third signal peak positions of HL are clearly far apart, whereas the second and third signal peak positions of DVD-DL are different. Are almost at the same position, the number of signal peaks of the DVD-DL may be counted only twice depending on the movement accuracy of the pickup and the signal detection accuracy.

In this case, the algorithm of the above embodiment (the algorithm based on the list 42 in FIG. 4) cannot be applied. This is because P1a and P1b in the same list 42 become one and the same determination condition as that of DVD-SL is obtained.

Therefore, in this embodiment, in order to cope with such a disadvantage in terms of accuracy (P1a and P1b become one), the difference (SL) between the reflection signal levels of DVD-SL and DVD-DL is considered. > DL), the DVD-S
L and DVD-DL can be identified.

As described above, in this embodiment, FIG.
As shown in the rough time chart at 0, (1)
The personal computer 50 inquires the tape reproducing device 80 about whether or not the master tape TAP is mounted. (2) If the response is NG, an appropriate message prompting the user to mount the master tape TAP is displayed on the display 5 of the personal computer 50.
(3) When the response is OK, (4) the personal computer 50 issues a disc discrimination request to the optical disc recording device 60.

In response to the request, the optical disk recording device 60 first determines (5) the presence or absence of a disk, and (6) responds to the personal computer 50 if there is no disk,
If there is a disk, (7) the determination algorithm of the embodiment (algorithm based on the list 42 in FIG. 4) or the determination algorithm of this embodiment (〜)
Is applied to determine the type of the optical disk DSK set in the optical disk recording device 60, and (8) the determination result is returned to the personal computer 50.

The personal computer 50 temporarily stores the discrimination result of the optical disk, (9) issues a data type request to the tape reproducing device 80, and (10) receives the tape type from the tape reproducing device 80. Matching / mismatching between the temporarily stored optical disc determination result and the tape type is determined. (12) If they match, for example, “Comp
are OK "on the display 51, or
(13) If they do not match, for example, "Compare
"NG" is displayed on the display 51.

Therefore, according to the present embodiment, prior to producing an optical disk (writing data to the optical disk DSK), it is determined whether or not the optical disk DSK suitable for the type of data recorded on the master tape TAP is set in the optical disk recording device 60. Can be checked in advance,
Use of an incompatible optical disk DSK can be avoided, and waste of resources and waste of production time can be eliminated.

In the above description, the specification or examples of various details and examples of numerical values, character strings, and other symbols are merely reference for clarifying the idea of the present invention, and all or one of them is referred to. It is obvious that the concept of the present invention is not limited by the parts. In addition, well-known techniques, well-known procedures, well-known architectures, and well-known circuit configurations (known matters) will not be described in detail, but this is also for the sake of simplicity.
It is not intended to exclude all or some of these well-known items. Such well-known matters can be known to those skilled in the art at the time of filing the present invention, and therefore are naturally included in the above description.

[0075]

According to the present invention, according to the number of appearances of signal peaks and the interval between signal peaks during the movement period of the pickup, the type of the optical disk is the first type, the second type.
, The third type, or the fourth type. Thus, for example, if the first type is C
D, the second type is DVD-SL, the third type is HL, and the fourth type is DVD-DL, so that in addition to CD, DVD-SL and DVD-DL, HL It is possible to provide an optical disk determination method and an optical disk determination device capable of correctly determining a disk.

When the number of appearances of the signal peak is two and the magnitude of the second signal peak is smaller than a predetermined value, the optical disc is determined to be of the fourth type, whereby the DV is determined.
Even if the signal reflected from the D-DL recording layer (multi-layer) is counted as one time, the D-DL having a single recording layer
VD-SL, and as above, C
D, DVD-SL and DVD-DL,
It is possible to provide an optical disk determination method and an optical disk determination device that can correctly determine an HL disk.

[Brief description of the drawings]

FIG. 1 is a schematic system configuration diagram of an optical disc reproducing apparatus or a combined reproducing / recording apparatus to which the present invention is applied, and a conceptual functional block diagram of a control unit 38.

FIG. 2 is a diagram illustrating a movement state of a pickup 31 during a first process period.

FIG. 3 is a flowchart showing a control operation (first step and second step) in a control unit 38;

FIG. 4 is a diagram showing a determination process in step S18 of FIG.

FIG. 5 is an overall configuration diagram of an optical disc production system.

FIG. 6 is an electrical simplified block diagram of a personal computer 50, an optical disk recording device 60, and a tape reproducing device 80;

FIG. 7 is a flowchart showing an operation of the personal computer 50.

FIG. 8 is a flowchart showing the operation of the tape reproducing device 80.

FIG. 9 is a flowchart showing an operation of the optical disc recording device 60.

FIG. 10 is a diagram showing a rough time chart of the present embodiment.

FIG. 11 is a structural diagram of an optical disc described in the official gazette.

FIG. 12: CD1, DVD-SL2 and DVD-DL3
FIG. 3 is a diagram showing an irradiation state of laser light to the laser beam and a reflection characteristic diagram of the laser light.

FIG. 13 is a structural diagram of a hybrid optical disk (HL disk).

[Explanation of symbols]

DSK ... optical disk, 31 ... pickup, 32 ...
... Laser light, 33 ... Optical disk, 38 ... Control unit (movement control means, discriminating means, first to fourth discriminating means), 60 ...
... optical disk recording device (optical disk discriminating device), 66 ...
... Pickup, 67 ... Laser light, 69 ... CPU
(Movement control means, determination means, first to fourth determination means).

Claims (6)

[Claims] 1. A method for irradiating a laser beam onto a disk surface of an optical disk and receiving the reflected light thereof while moving the pickup at a constant speed in one direction along a vertical direction of the disk surface, while reflecting the light received by the pickup. An optical disc discriminating method for converting light into an electric signal and discriminating the type of the optical disc based on a time-series appearance state of a signal peak included in the electric signal, wherein the number of appearances of the signal peak during the movement period of the pickup Is two times and the interval between the first and second signal peaks is greater than a predetermined value, the optical disc is determined to be of the first type, while the number of appearances is two and the first and second times. If the interval between signal peaks is smaller than a predetermined value, the optical disc is determined to be of the second type, and the number of appearances is three and the second and third signal peaks are performed. In the case where the interval of the laser beam is larger than the predetermined value, the optical disc is determined to be of the third type. On the other hand, when the number of appearances is three and the interval between the second and third signal peaks is smaller than the predetermined value, An optical disc discriminating method, wherein the discriminating method is a fourth type. 2. A method of irradiating a laser beam onto a disk surface of an optical disk to receive a reflected light thereof while moving the pickup at a constant speed in one direction along a vertical direction of the disk surface while reflecting the light received by the pickup. An optical disc discriminating method for converting light into an electric signal and discriminating the type of the optical disc based on a time-series appearance state of a signal peak included in the electric signal, wherein the number of appearances of the signal peak during the movement period of the pickup Is two times and the interval between the first and second signal peaks is greater than a predetermined value, the optical disc is determined to be of the first type, while the number of appearances is two and the first and second times. If the interval between signal peaks is smaller than a predetermined value, the optical disc is determined to be of the second type, and the number of appearances is three and the second and third signal peaks are performed. If the distance between the marks is greater than a predetermined value, the optical disc is determined to be of the third type, while the number of appearances is three and the distance between the second and third signal peaks is smaller than a predetermined value, or An optical disc discriminating method, wherein if the number of appearances is two and the magnitude of the second signal peak is smaller than a predetermined value, the optical disc is discriminated as a fourth type. 3. The first type is a CD, and the second type is a CD.
3. The optical disk according to claim 1, wherein the type is DVD-SL, the third type is HL, and the fourth type is DVD-DL. Judgment method. 4. A pickup for irradiating a laser beam onto a disc surface of the optical disc and receiving a reflected light thereof; a movement control means for moving the pickup in one direction at a constant speed along a vertical direction of the disc surface; An optical disc discriminating apparatus comprising: a discriminating unit that converts reflected light received by the pickup into an electric signal and discriminates the type of the optical disc based on a time-series appearance state of signal peaks included in the electric signal; The determining means determines that the optical disk is of the first type when the number of appearances of the signal peak during the movement period of the pickup is two and the interval between the first and second signal peaks is larger than a predetermined value. An optical disc when the number of appearances is two and the interval between the first and second signal peaks is smaller than a predetermined value; 2
A second discriminating means for discriminating the type of the optical disc; and when the number of appearances is three times and the interval between the second and third signal peaks is larger than a predetermined value, the third discrimination means is used.
A third discriminating means for discriminating the type of the optical disc; and when the number of appearances is three and the interval between the second and third signal peaks is smaller than a predetermined value, the optical disc is discarded.
An optical disc discriminating apparatus, comprising: fourth discriminating means for discriminating the type of the optical disc. 5. A pickup for irradiating a laser beam on a disk surface of an optical disk and receiving a reflected light thereof, a movement control means for moving the pickup in one direction at a constant speed along a vertical direction of the disk surface, An optical disc discriminating apparatus comprising: a discriminating unit that converts reflected light received by the pickup into an electric signal and discriminates the type of the optical disc based on a time-series appearance state of signal peaks included in the electric signal; The determining means determines that the optical disk is of the first type when the number of appearances of the signal peak during the movement period of the pickup is two and the interval between the first and second signal peaks is larger than a predetermined value. An optical disc when the number of appearances is two and the interval between the first and second signal peaks is smaller than a predetermined value; 2
A second discriminating means for discriminating the type of the optical disc; and, if the number of appearances is three times and the interval between the second and third signal peaks is larger than a predetermined value, the third discrimination means.
A third discriminating means for discriminating the type of the signal, the number of occurrences being three and the interval between the second and third signal peaks being smaller than a predetermined value, or the number of occurrences being two and the second If the magnitude of the signal peak is smaller than the predetermined value, the optical disc is determined to be of the fourth type.
An optical disc discriminating apparatus, comprising: discriminating means. 6. The first type is a CD, and the second type is a CD.
6. The optical disk according to claim 4, wherein the type is DVD-SL, the third type is HL, and the fourth type is DVD-DL. Discriminator.