JPH0757263A - Optical disk and optical disk device - Google Patents

Abstract

PURPOSE:To realize an optical disk realizing a high-density medium by a conventional stamper technique and securing the compatibility with a conventional device, and an optical disk device capable of reproducing the optical disk. CONSTITUTION:The optical disk is constituted of a reproducing dedicated area 17 by a mark position recording system and a rewritable area by a mark length recording system 16, and recording attribute information showing the information showing the position are recorded on a specified position. Means 32, 35 reading the information of the specified position of the medium and deciding the recording attribute, etc., of a reproducing object area and the means 32, 37, 38, 39 and 40 selecting a mark position reproducing system in the case of the reproducing dedicated area of the mark position recording system, and selecting a mark length reproducing system in the case of the rewritable area of the mark length recording system and reproducing it are provided in the device capable of reproducing the medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having a read-only area and a rewritable area, and an optical disk device having a reproducing function of the optical disk.

[0002]

15 to 17 are views showing a conventional example. In FIGS. 15 to 17, 1 is a stamper, 2 is a medium substrate,
Reference numeral 3 indicates a recording pit (emboss).

§1: Description of optical disc An optical disc (hereinafter, also simply referred to as “medium”) is a disc for recording / reproducing information by irradiating a laser beam or applying a magnetic field as needed. Broadly speaking, "playback-only optical discs",
"Write-once optical disc", "rewritable optical disc"
There are three types. These optical disks are as follows.

In a "reproduction-only optical disc", a transparent resin substrate formed in a disc shape is formed with a reflection film made of a metal thin film (for example, aluminum), and irregularities are formed on the reflection film to record information. It is a thing.

A "write-once optical disc" is a
A recording film made of a material that easily sublimes such as tellurium is formed, and the recording film is irradiated with laser light to form information in the form of holes. In this case, the information can be written only once.

As the "rewritable optical disk", one using a magneto-optical effect (MO) and one using a phase change are known. For example, an MO type disk utilizing the magneto-optical effect is obtained by forming a magnetic film (perpendicular magnetization film) on a substrate, heating the magnetic film by irradiating strong laser light, and applying a magnetic field. Information is recorded.

When the signal is reproduced, the external magnetic field is removed, weak laser light is irradiated, and the angle of the plane of polarization of the reflected light reflected from the medium surface is detected. §2: Description of Conventional Example 1 Conventionally, an optical disk device has been used as a large-capacity storage medium, but there has been no need to increase the capacity, and further high-density recording methods have been proposed. One of them is a magneto-optical disk device described in Japanese Patent Laid-Open No. 4-90168.

In the optical disk (magneto-optical disk) used in this device, the center position of the recording pit is signaled (data).
From the conventional recording method (mark position recording method) corresponding to 1 (state with signal or data), the edges (leading edge, trailing edge) on both sides of the recording pit are associated with 1 of signal (data). A high-density recording method (mark length recording method) is used to double the recording density.

§3: Description of Conventional Example 2 Further, for example, in Japanese Patent Application Laid-Open No. 2-289937, 1
There is described an optical disc in which a reproduction-only area and a rewritable area are provided in a single optical disk, and information which cannot be rewritten is written in the reproduction-only area.

In this optical disc, a reproduction-only area and a rewritable area are provided in one optical disk substrate,
The mark length recording method (high density recording method) is adopted in the reproduction-only area, and the mark position recording method (conventional normal recording method) is adopted in the rewritable area.

§4: Description of read-only area of high-density medium
.. Refer to FIG. 15. FIG. 15 is a diagram for explaining the reproduction-only area of the high-density medium.
Is a stamper, B is a medium substrate, C is an ideal reproduction signal, D is an actual reproduction signal, and E is a binarization pulse. Below, FIG.
A high density medium based on the mark length recording method will be described with reference to FIG.

In general, the read-only area of the medium is manufactured by molding the medium base material 2 with the stamper 1.
Also, a reproduction-only area of the high-density recording medium according to the mark length recording method is manufactured in the same manner.

In this case, information (data) is recorded on the medium base material 2 by forming the recording pits 3 by molding the stamper 1, but variations in shape occur at the edges of the recording material. .

The ideal reproduced signal when reproducing this high density medium is a rectangular wave signal (rectangular wave signal according to the shape of the recording pit 3) as shown in FIG. 15C, but the actual reproduced signal is As shown in FIG. 15D, the rectangular wave signal is not obtained. That is, the reproduced signal waveform is disturbed due to the shape variation of the edge of the recording pit 3.

By the way, when reproducing the medium, it is necessary to convert the signal read from the medium (analog signal of FIG. 15D) into a binarized pulse and demodulate it. Therefore, when the analog signal shown in FIG. 15D is sliced at a predetermined slice level and converted into a binarized pulse, pulses as shown in FIG. 15E (corresponding to “1” and “0” of data) are obtained. can get.

However, if the waveform of the reproduction signal shown in FIG. 15D is disturbed due to the variation of the edge shape, the timing of pulsing is shifted, and erroneous data may be reproduced.

§5: Description during reproduction of medium--see FIGS. 16 and 17 FIG. 16 is an explanatory view during reproduction of a mark position recording medium, and FIG. 17 is an explanatory view during reproduction of a mark length recording medium. Below, Figure 1
6, the mark position recording medium and the mark length recording medium will be described when the medium is reproduced.

In the figure, A is a medium area, B is PR (Pr
eformat: play-only area) / MO (rewritable area)
The switching state, C is the recording density (H / L), D is the capacity of each area, and E is the user capacity (capacity viewed from the user).
In addition, the PR / MO switching state shown in the above B is PR
The side is shown as a high level H and the MO side is shown as a low level L.

In the recording density shown in C, the mark position reproducing system (system in which the center of the pit is reproduced corresponding to 1 of the signal) is low level L and the mark length reproducing system (edges on both sides of the pit). Is reproduced in correspondence with "1" of the signal) as a high level H. When reproducing the medium, first, the header is reproduced, and then the recording field is reproduced.

Mark position recording medium (medium in which all areas are constructed by the mark position recording system) Description during reproduction ... See FIG. 16 In this reproduction process, a header and a recording field of a reproduction-only area are included. During reproduction of the first sector (left side in the figure), PR / MO selects the H (PR) side, sets the recording density to the low level L, and reproduces the medium.

When reproducing the next one sector (right side in the drawing) including the header and the recording field of the rewritable area, first, the header is reproduced in the same state as the reproduction of the preceding one sector, and then, PR / MO to L
Switching to the (MO) side, the recording field (rewritable area) is reproduced while the density remains L.

In this case, the capacity of each area is as shown in the figure. That is, for the first sector, the header is 52 bytes, and the area for phase synchronization (VFO ₃ , syn) is used.
c) has 15 bytes, and the data field has 639 bytes. The same applies to the next sector.

Subtracting the capacity that cannot be used by the user from each capacity, the user capacity is practically 512 bytes for each sector. : Mark length recording medium (high density medium in which all areas are mark length recording system) Description at the time of reproduction ... See FIG. 17 In this reproducing process, the first 1 sector including the header and the recording field of the reproduction-only area ( At the time of reproducing (left side of the drawing), the PR / MO selects the H (PR) side, sets the recording density to the high level H, and reproduces the medium.

When reproducing the next one sector (right side in the figure) including the header and the recording field of the rewritable area, first, the header is reproduced in the same state as the reproduction of the previous one sector, and then, PR / MO to L
The recording field (rewritable area) is reproduced while switching to the (MO) side and keeping the recording density at H.

In this case, the capacity of each area is as shown. That is, for the first 1 sector, the header is 52 bytes, and the area for phase synchronization (VFO ₃ , sync)
Is 30 bytes and the data field is 1278 bytes. The same applies to the next sector.

Subtracting the capacity that cannot be used by the user from each capacity, the user capacity is substantially 1024 bytes for each sector.

[0027]

SUMMARY OF THE INVENTION The above-mentioned conventional devices have the following problems. : In the read-only area of the medium, information is recorded by forming recording pits by molding the stamper. In this case, in the read-only area of the high-density medium, the edges on both sides of the recording pit correspond to data "1".

However, when the recording pits are formed by molding the stamper, shape variations easily occur at the edges of the recording pits. Therefore, when the reproduction-only area of the high-density medium is reproduced, the waveform of the reproduction signal may be disturbed due to the variation in the edge shape, and erroneous data may be reproduced.

That is, in a high-density medium in which the reproduction-only area has a mark length recording system, data errors are likely to occur during reproduction. A read-only area and a recordable area are provided in one optical disk substrate, a mark length recording method (high-density recording method) is adopted in the read-only area, and a mark position recording method ( An optical disc adopting a conventional normal recording system cannot ensure compatibility with a conventional optical disc (medium of the mark position recording system).

The present invention solves such conventional problems, realizes an optical disk capable of high density recording by a conventional stamper technology, and secures compatibility with a conventional device, and an optical disk of the optical disk. It is an object to realize a reproducible optical disk device.

[0031]

FIG. 1 is a diagram for explaining the principle of the present invention. In FIG. 1, the same parts as those in FIGS. 15 to 17 are designated by the same reference numerals.

Reference numeral 15 is an optical disk (hereinafter also simply referred to as "medium"), 16 is a rewritable area, 17 is a read-only area (read-only area), 19 is an optical disk device, 21 is a controller, 27 is an optical head (hereinafter 28 is a read circuit, 32 is a control unit, 35 is a management table setting memory, 37 is a mark length recording binary circuit, 38 is a mark position recording binary circuit, and 39 and 40 are switching. Indicates a switch.

The present invention has the following constitution to solve the above problems. : Reproduction-only area 17 that only reproduces data and rewritable area 1 in which data can be rewritten by the user
And a read-only area 17
Is a recording area according to a mark position recording method in which the center of the recording pit on the optical disk (medium) is associated with a signal (data), and the rewritable area 16 is located on both sides of the recording pit (recording domain) on the optical disk. An optical disc in which the edges (leading edge, trailing edge) to be formed are recording areas according to a mark length recording method corresponding to signals (data).

An optical disc having a reproduction-only area 17 for only reproducing data and a rewritable area 16 in which data can be rewritten by a user, in which the physical address of a sector in the rewritable area 16 is changed in shape. The optical disc has a header area recorded by the recording area by the mark position recording method.

: In the structure, the reproduction-only area 17,
An optical disc in which recording attribute information indicating the existence of the rewritable area 16 and information (physical address) indicating the position thereof are recorded at a specific position of the optical disc.

Rewritable area 16 according to the mark length recording method in which the edges (leading edge and trailing edge) formed on both sides of the recording pit on the optical disk are made to correspond to signals (data).
And the signal (data) at the center of the recording pit on the optical disc
Read-only area 1 by the mark position recording method corresponding to
7 is an optical disk device capable of reproducing an optical disk 15 in which recording attribute information indicating the existence of a read-only area 17 and a rewritable area 16 and information indicating the position are recorded at a specific position of the optical disk. Means for reading the information at the specific position when the optical disk 15 is inserted, determining whether the area to be reproduced is the rewritable area 16 or the reproduction-only area 17 and the recording method of the area (32) , 35), and the area to be reproduced by the means is a reproduction-only area 1 by the mark position recording method.
If it is determined to be 7, the mark position reproducing method for reproducing the center of the recording pit corresponding to the signal (data) is selected, and the area to be reproduced is the rewritable area 16 by the mark length recording method. If it is determined that there is,
An optical disk device provided with means (32, 37, 38, 39, 40) for reproducing data by selecting a mark length reproduction system in which edges on both sides of a recording pit are reproduced corresponding to signals (data).

In the configuration, an optical disc device in which, in the area to be reproduced, the header area in which the physical address of the sector is recorded by the shape change is reproduced by selecting the mark position reproducing method regardless of the recording method.

[0038]

The operation of the present invention based on the above configuration will be described with reference to FIG. : Operation of optical disc ... See FIG. 1A. The optical disc is configured as described above, and, for example, in the read-only area thereof, information that is difficult to rewrite or information that does not need to be rewritten is recorded. The rewritable area is the area used by the user.

In this case, the reproduction-only area is manufactured by molding the stamper which has been used conventionally, but this area is recorded by the mark position recording method. Therefore, there is no influence of the edge of the recording pit during reproduction, and no error occurs during reproduction.

Further, since the rewritable area is formed by the mark length recording method, high density recording can be performed. Moreover, since this area is not manufactured by stamper molding, no error occurs during reproduction.

In this way, a high density optical disc can be manufactured by using the conventional stamper technique as it is. In addition, the optical disk can be reproduced by a conventional device (at least the reproduction-only area can be reproduced), and compatibility can be ensured.

Operation of Optical Disk Device ... See FIG. 1B When inserting a medium, first, information (control zone and DMA) in a specific area is read from the optical disk (medium) 15. Then, the read data is sent to the controller 21, and the control unit 32 causes the management table setting memory 3
Information to be used at the time of reproduction is stored in 5 to create a management table, and a ready state is set.

When the control unit 32 receives a read command from the host in the ready state, the control unit 32 obtains the physical address of the target sector from the management table of the management table setting memory 35. Then, a seek to the target position is performed.

At this time, the control unit 32 looks at the management table and determines whether the area to be reproduced is a reproduction-only area or a rewritable area. When the area is known, the read circuit 28 starts the read processing (reproduction processing).

At the time of reading, (a) processing for reproducing the header area, (b) processing for switching the changeover switches 39 and 40 for reproducing the recording field following the header area, and (c) recording field (data recording area). ) Is performed.

In the process (a), the mark position recording binarization circuit 38 side of the read circuit 28 is selected (the changeover switch 39 is changed over to the d side and the changeover switch 40 is changed over to the a side) regardless of the medium. , Plays the header area.

Further, in the processing of b, the changeover switch 40 is switched depending on whether the recording field of the medium is the "reproduction-only area" or the "rewritable area" (P
R / MO switching) and switching of the changeover switch 39 (density switching) depending on whether the "rewritable area" is the "mark length recording area" or not.

In the process of C, the recording field is reproduced with the changeover switch being switched in the process of B. As described above, the optical disc of the present invention can be reproduced.

By doing so, an optical disc which realizes a high-density recording medium by the conventional stamper technology and ensures compatibility with the conventional optical disc device, and an optical disc device capable of reproducing the optical disc are realized. be able to.

[0050]

Embodiments of the present invention will be described below with reference to the drawings. 2 to 14 are views showing an embodiment of the present invention. In FIGS. 2 to 14, the same parts as those in FIGS. 1 and 15 to 17 are designated by the same reference numerals.

Further, 11 and 12 are edges, 13 is a clock (CLK), 14 is a signal (data), 20 is a host (host computer), 22 is a control section, 23 is a servo control section, 24 is a light quantity control section, 25 is a spindle control unit,
26 is a spindle motor, 29 is a write circuit, 30 is a magnetic field generation unit, 33 is a serial-parallel conversion / error correction unit, 34 is a decoder, 36 is a data separator, 41 is a photodetector, 42
Is a laser diode (LD), 43 is a beam splitter, and 44 and 45 are lenses.

§1: Description of recording method of optical disk (medium) ... See FIG. 2. FIG. 2 is an explanatory view of the recording method, A is an explanatory view of the mark length recording method, and B is an explanation of the mark position recording method. It is a figure.

In this embodiment, as a recording method of an optical disk (medium), a "mark position recording method" described below is used.
(Conventional normal recording method) and "Mark length recording method"
Each recording area by (high density recording method) is provided. Less than,
Each recording method will be described.

: Description of Mark Length Recording Method ... See FIG. 2A. The mark length recording method is the edge 1 on both sides of the recording pit 3.
This is a high-density recording system in which 1 and 12 (leading edge and trailing edge) correspond to "1" of a signal (data).

In this recording method, the presence or absence of the edges 11 and 12 formed on both sides of the recording pit 3 corresponds to signals "1" and "0", respectively, and is a clock which is a synchronizing signal for information recording. A signal (data) 14 is reproduced in synchronization with 13.

In this medium, the laser light to be emitted has an edge 11 (front edge) which enters the recording pit 3 from the disk surface or an edge 12 (rear edge) which exits from the recording pit 3 to the disk surface of "1". The disk surface having no edge or the plane in the recording pit 3 corresponds to the signal "0".

That is, the edge 1 of the recording pit 3 is located at the irradiation position of the reading laser light corresponding to the clock 13.
By detecting the presence or absence of 1 or 12,
Play the information. Therefore, this recording method can record twice as much information as the mark position recording method.

： Description of mark position recording method ... See FIG. 2B. The mark position recording method is a recording method in which the center position of the recording pit 3 corresponds to “1” of the signal (data) (recording method depending on presence or absence of pits). ).

Therefore, in this mark position recording system, if the recording pit 3 exists, the signal "1" is set at the center position of the pit and the signal "0" is set at the position where the recording pit 3 does not exist. In this recording method, the recording pit 3
The positions of the edges 11 and 12 on both sides of are not used for signal recording.

As described above, in the case of the mark position recording system, information is read by detecting the presence or absence of the recording pit 3 at the position corresponding to the clock 13. §2: Description of the optical disc (medium) of the embodiment ... FIG.
See FIG. 4. FIG. 3 is a block diagram of an optical disk (medium). Also, FIG.
Is an explanatory diagram of a medium, A is a sector of a reproduction-only area, and B is
Is a sector of a rewritable area, and C is a layout explanatory diagram on the medium.

Description of Configuration of Optical Disk--See FIG. 3 In this embodiment, the optical disk is configured as shown in FIG. As the optical disc 15, an MO type optical disc (magneto-optical disc) utilizing the magneto-optical effect is used.

As shown in the figure, the optical disk (medium) 15 is provided with a rewritable area 16 and a read-only area (read-only area) 17. The rewritable area 16 is an area based on the mark length recording method (high density recording area), and the read-only area (read-only area) 17 is
The area is based on the mark position recording method.

In this example, the inner circumference side of the optical disk 15 is the reproduction-only area 17 and the outer circumference side is the rewritable area 16. However, the inner circumference side is the rewritable area 16 and the outer circumference side is the reproduction-only area 17. Also good.

: Description of Sectors in Each Area ... See FIGS. 4A and 4B As shown in FIGS. 4A and 4B, a large number of sectors are provided in the reproduction-only area and the rewritable area.
In each sector, a header (recording area for sector mark, ID, etc.) and a recording field (recording area for data) following the header are provided with a gap in between.

The recording method of each recording area is set as shown in the figure. That is, in the sector in the read-only area 17 shown in FIG. 4A, the header and the recording field are used as a recording area (mark position recording area) by the mark position recording method.

In this reproduction-only area, all sectors are manufactured by die molding (embossing) using a stamper. In this case, for example, information that is difficult to rewrite or information that does not need to be rewritten is recorded in this reproduction-only area.

The rewritable area 1 shown in FIG. 4B is also included.
In the sector within 6, the header is a mark position recording system,
The recording field (recording area) is a mark length recording system.

In the sector in the rewritable area 16, the header is a read-only area and is manufactured by die molding (embossing) using a stamper. Then, only the recording field is set as a rewritable area in which the user can freely rewrite data.

That is, in the rewritable area 16, only the recording field of each sector is a high-density rewritable area that can be rewritten by the user. : Description of Layout on Medium ... Refer to FIG. 4C As shown in FIG. 4C, the reproduction-only area 1 is provided on the medium.
7. In addition to the rewritable area 16, a control area (control field) that cannot be used by the user
5 and a DMA (medium defect management area) 6 are provided.

Therefore, in this embodiment, the information indicating the existence of each area and the information on the position thereof are set in the control area 5 in advance. When reproducing the data of each area, the information of the DMA 6 in which the position information, the defect information and the like of each area other than the control area 5 are stored is also read and reproduced. The detailed layout will be described later.

§3: Detailed description of medium layout--see FIG. 5 FIG. 5 is an explanatory diagram (ISO /
IEC regulations). Hereinafter, the layout of the medium will be described in detail with reference to FIG.

As shown in the figure, the ISO (International Organization for Standardization) and IEC (International Electrotechnical Commission) regulations are as follows:
There are regulations for each medium (optical disk). In this regulation, the medium # 1 is defined as a fully rewritable area, and the medium # 2 is defined as a rewritable area and a read-only area (Partially Embossed). Play-only area (Fully Embo
ssed) medium # 3.

In the figure, "Inner Control Zone" indicates an inner control zone (inner control area) and "Buff
"er Track" is a buffer track (buffer track), "D
"MA" is a defect management area (defect information management area), "RewritableZone" is a rewritable area, "R / W" is read / write, and "Outer ControlZon".
e "is the outer control zone (outer control area),
"Embossed Zone" indicates a read-only area, and "Track" indicates a track number (the inner circumference side is a negative number).

According to the above rules, the # 1 medium is provided with a "rewritable zone",
The second medium is a "rewritable zone"
) And a “playback-only area” (Embossed Zone) are provided, and the # 3 medium has a playback-only area (Embossed Zone).
Is provided.

Description of Regulation of Medium # 1 In the regulation of medium # 1, all areas are rewritable areas (fully
Rewritable) is a regulation of the medium. This medium includes
"Inner Control Zone", "Buffer Track", "DMA"
1 to 4 (R / W) ”,“ Rewritable Zone (R / W
W) ”and“ Outer Control Zone ”.

Of these, "Rewritable Zone (R / W)"
Is an area where the user can write and read data. The "Inner Control Zone" and the "Outer Control Zone" are areas for recording control information. The same information is recorded in both areas, and the device reads both areas at the time of reading. To control.

"DMA1 to 4 (R / W)" are areas for managing defect information of the medium, and are areas for recording defect information. : Description of Regulation of Medium # 2 The regulation of the medium # 2 is a regulation of a medium having both a rewritable area and a read-only area (Partially Embossed).

This medium includes "Inner Control Zone",
"Buffer Track", "DMA1-4 (R / W)", "Re
writable Zone (R / W) "," Embossed Zone ",
There is an "Outer Control Zone".

Of these, the "Embossed Zone" is an area in which reproduction-only information is recorded. The other areas are the same as the medium # 1. : Description of the regulation of medium # 3 In the regulation of medium # 3, the entire area is a read-only area (Fully Embo
ssed) is the regulation of the medium. This medium includes "Inner Co
ntrol Zone ”,“ Buffer Track ”,“ DMA1-4 ”,
There are "Embossed Zone" and "Outer Control Zone".
Each of these areas is the same as the medium # 1 and the medium # 2.

In the present embodiment, description of the area used particularly for information management In the present embodiment, among the above areas, “Inner Control Zone
In the control area (control zone) of “e” and “Outer Control Zone”, the presence or absence of the read-only area and the rewritable area, and the information of the existence position thereof, that is, the physical address and the information such as the recording attribute are previously stored. Keep a record.

In the "DMA" area, in order to manage defect information, "logical address" and "physical address" are stored.
Since the information such as the correspondence is recorded, this information is read and used.

§4: Description of Sector Format--See FIG. 6 FIG. 6 is an explanatory diagram of the sector format. As shown in FIG. 5, a sector is composed of a header,
It is composed of a recording field (it should be noted that GAP exists between the two).

The header (Header) has a sector mark (SM) and a VFO area (VFO) for phase adjustment.
₁ , VFO ₂ , VFO ₃ ), ID area for identification (I
D ₁ , ID ₂ , ID ₃ ) and the like are provided. In addition, ID
Secures reliability by recording ID ₁ , ID ₂ , and ID ₃ three times.

In the recording field, there are clock phase regions (VFO ₃ , syn for phase matching).
c), a data field (Data Field), a postamble area (PA), and a buffer area (BUF) are provided.

Further, in the ID area, a track number (Track No.), an ID number (ID No.), a sector number (Se
ctor No.), CRC code (error correction code), etc. can be set. The number of bytes for each area (the number in the figure indicates the number of bytes) is as shown in the figure.

§5: Description of the configuration of the optical disk device ...
7 and FIG. 8 FIG. 7 is a block diagram of the optical disk device, and FIG. 8 is a partial detailed view of FIG. As shown in FIG. 7, the optical disk device 19 includes a controller 21, a controller 22, and a servo controller 2.
3, a light quantity control unit 24, a spindle control unit 25, a spindle motor 26, a head (optical head) 27, a read circuit 28, a write circuit 29, a magnetic field generation unit 30, and the like are provided.

The optical disk device 19 is connected to a host (host computer) 20 for use. Further, as shown in FIG.
A control unit 32, a serial / parallel conversion / error correction unit 33, and a management table setting memory 35 are provided. The read circuit 28 includes a data separator 36 and a mark length recording / binarization circuit 3.
7, a mark position recording binarization circuit 38, changeover switches 39 and 40, a decoder 34 and the like are provided.

Further, the head 27 includes a photodetector 41, a laser diode (LD) 42, a beam splitter 43,
Lenses 44, 45, etc. are provided. Functions and the like of the above-mentioned respective parts are as follows.

(1): The controller 21 exchanges commands with the host 20, exchanges data, etc. (interface control), and performs various controls in the optical disk device 19 (upper control unit). is there.

(2): The control unit 22 exchanges commands with the controller 21, performs data transfer control, and controls the servo control unit 23, the light amount control unit 24, the spindle control unit 25, and the like. It is a thing.

(3): The servo control section 23 drives and controls the head 27 (seek control, etc.) according to an instruction from the control section 22. (4): The light quantity control unit 24 controls the laser diode (LD) which is a light source in the head 27, and
The light amount of the laser beam applied to the interior is adjusted.

(5): The spindle control section 25 controls the rotation of the spindle motor 26. (6): The spindle motor 26 rotationally drives the optical disk 15 via a spindle mechanism.

(7): The head (optical head) 27 irradiates the optical disc 15 with laser light to read / write data. (8): The read circuit 28 is a circuit that processes a read signal when reading data from the optical disc 15.

(9): The write circuit 29 is a circuit for processing write data when writing data to the optical disc. (10): The magnetic field generation unit 30 generates a magnetic field on the optical disc 15 when writing data on the optical disc 15.

(11): The control section 32 performs the interface control and various controls in the optical disk device 19. Further, in this control, the management table setting memory 35 is managed.

(12): The serial / parallel conversion / error correction section 33 performs error correction processing on the data decoded (demodulated) by the decoder 34 and performs serial / parallel conversion. (13): The decoder 34 decodes (demodulates) the data separated by the data separator 36.

(14): The management table setting memory 35 is
It is a memory for setting the management table and is composed of a RAM. The management table set in the management table setting memory 35 stores information used when the control unit 32 controls the data reproduction.

(15): The data separator 36 converts the input signal (pulse) input via the changeover switch 39 into
It performs a process of separating the data and the clock. (16): The mark length recording binarization circuit 37 is a circuit that binarizes the signal (analog signal) read from the mark length recording area and converts it into a pulse signal.

(17): The mark position recording binarization circuit 38
This is a circuit for binarizing a signal (analog signal) read from the mark position recording area and converting it into a pulse signal. (18): The changeover switches 39 and 40 are switches that perform a changeover according to a changeover signal from the control unit 32.

In this case, the changeover switch 39 is for changing over the recording density.
Reference numeral 9 denotes a switch for switching between a signal from the PR (preformatted area: reproduction only area) and an MO (signal from the rewritable area).

(19): The photodetector 41 detects the laser light (reflected light from the medium) separated by the beam splitter 43. From the photodetector 41, the PR signal and the MO light are detected.
The signal is output.

(20): The laser diode (LD) 42 is
A laser diode (laser light source) provided in the head 27. §6: Operation outline description of optical disk device ... FIGS. 7 and 8
Reference: Overview of overall operation of the device ... See FIG. 7. When an optical disc (medium) is inserted into the optical disc device 19, the control unit is based on information from a sensor (not shown) that detects the insertion of the medium. 22 detects the medium insertion state, and the controller 21 also recognizes the medium insertion.

When reading / writing from / to the medium, the control section 22 causes the servo control section 23, the light quantity control section 24, and the spindle control section 2 according to an instruction from the controller 21.
A control signal is sent to 5 or the like to start control.

Under this control, the spindle control section 25 rotates the spindle motor 26 to control the rotation, and the light quantity control section 24 turns on the laser diode (LD) in the head 27 to instruct the intensity of the laser beam. Control in the street. The servo control unit 23 also controls the drive of the head 27 (positioning control, etc.).

In this case, when the data is reproduced, the signal read via the head 27 is demodulated by the read circuit 28 and sent to the controller 21. Then, the demodulated data is transferred from the controller 21 to the host 20. On the other hand, when writing data, the controller 21 sends the data received from the host 20 to the write circuit 29,
The data processed by the write circuit 29 is sent to the head 27 and written on the medium. In this case, by the control of the control unit 22,
The magnetic field generator 30 is driven to generate a magnetic field from outside the medium.

Outline of Operations of Controller and Read Circuit--See FIG. 8 An outline of processing at the time of data reproduction (at the time of reading) will be described below with reference to FIG. When inserting the medium, the control unit 3
By the control of 2, the information in the specific area (control area 5 and DMA 6 in FIG. 4) is reproduced from the medium.

Then, the control section 32 stores the management information in the management table setting memory 35 based on the reproduced information of the specific area and creates the management table. After that, the control unit 32 uses the management table to control when reproducing the medium.

For example, when the control section 32 receives a read command from the host, it controls each section and reproduces the medium. At this time, the control unit 32
Obtains information from the management table setting memory 35, confirms the presence or absence of the reproduction-only area and the rewritable area of the medium and the position where the area exists, and controls the changeover switches 39 and 40 to perform the reproduction process. To do.

By changing over the changeover switches 39 and 40, the changeover switch 40 selects either one of the two signals (PR / MO) output from the head 27, and the changeover switch 39 selects the mark length recording. The output of either one of the binarization circuit 37 and the mark position recording binarization circuit 38 is selected (recording density is selected).

Then, the output selected by the change-over switch 39 is sent to the data separator 36 to separate the data from the clock, and then the decoder decodes (demodulates).
By doing so, data reproduction processing is performed.

In the above processing, the mark length recording binarization circuit 37 binarizes the edges existing on both sides of the recording pit on the medium based on the reproducing method in which the signal (data) is associated with "1". Then, the mark position recording binarization circuit 38 binarizes the center position of the recording pit based on the reproduction method in which the signal "1" is associated.

Thereafter, the reproduced data is subjected to error correction processing and serial / parallel conversion processing in the serial / parallel conversion / error correction section 33 and transferred to the host. §7: Description of example management table--see FIG. 9 FIG. 9 is a diagram showing an example management table. The management table set in the management table setting memory 35 in the controller 21 has, for example, the configuration shown in FIG.

This management table is "logical address".
In this configuration, items of “Physical address” and “Recording attribute” are paired. According to this management table,
"Logical address", "Physical address", and "Recording attribute"
I know the relation with. Therefore, at the time of reading the medium, it is possible to determine what area of the medium has what kind of recording attribute by looking at this management table.

For example, in the illustrated example, the logical address is "0.
The physical address of the area "0000" is "000100"
It can be seen that this address is a reproduction-only area (Embossed).

Further, in the area having the logical address “01000”, the physical address is “010000”, the address is a rewritable area, and the recording attribute is the mark position recording area. .

Further, in the area of the logical address "06543", the physical address is "070000", this address is a rewritable area, and the recording attribute is the mark length recording area (high density recording area). ).

The management table is created by the control unit 32 when the medium is inserted. These data are stored in the "control area" (control zone) of the medium.
Read and create "DMA".

That is, the physical address (actual position on the medium) and the recording attribute are recorded in advance in the "control area" (control zone) of the medium, and this information is read out. Further, since the relationship between the logical address and the physical address, the defect information of the medium, and the like are recorded in the "DMA", the management table can be created by reading these information.

§8: Description of Processing When Inserting Medium ... See FIG. 10 FIG. 10 is a flowchart of processing when inserting a medium. Hereinafter, the process when the medium is inserted will be described with reference to FIG.
It should be noted that S1 to S7 indicate respective process numbers.

First, when an optical disk (medium) is inserted into the optical disk device 19 while the apparatus power is on, the control section 22 detects this state and the controller 21 also recognizes the insertion of the medium. Then, according to the instruction from the controller 21,
The control unit 22 controls each unit.

By this control, the spindle control section 25 rotates the spindle motor 26 (S1), and the light quantity control section 24 causes the laser diode (LD) 42 in the head 27 to be rotated.
Is turned on (lit) (S2). Subsequently, the servo control unit 23 starts servo control (servo on) (S
3).

In this state, the read circuit 28 reads the control zone from the optical disk (medium) 15 (S4), and then reads the DMA (S5). Then, the read data is sent to the controller 21, and the controller 21
The control unit 32 in the management table setting memory 3
A management table is created in 5 (S6).

When the management table creating process is completed, the device is set to the ready state (S7). §9: Description of processing when receiving read command--see FIG. 11 FIG. 11 is a flowchart of processing when receiving a read command. Hereinafter, the process at the time of receiving the read command following the process of FIG. 10 will be described with reference to FIG. In addition, S11
S15 indicates each processing number.

In the ready state, the controller 2
1 receives a read command from the host 20 (S1
1), the control unit 32 in the controller 21 obtains the physical address of the target sector from the management table setting memory 35 (S12).

Then, under the control of the servo controller 23,
The head 27 is sought (S13). At this time, the control unit 32 looks at the management table setting memory 35 and determines whether it is the reproduction-only area or the rewritable area (S14). When the area is known, the read circuit 28 starts the read process (S15).

§10: Description of Read Processing--See FIG. 12 FIG. 12 is a read processing flowchart. Below, Figure 1
The read processing (medium reproduction processing) following the processing of FIG. 11 will be described based on 2. Note that S21 to S31 indicate respective process numbers.

In the processing of S21 to S31 described below, the reproduction processing is performed for each sector on the medium. These processings are roughly classified into the following three. That is: processing of S21 to S24 for reproducing the header area, processing of S25 to S28 for switching the changeover switches 39 and 40 for reproduction of the recording field following the header area: recording field ( S29 for reproducing the data recording area)
~ S31 processing.

In the processes of S21 to S24, the "mark position recording" side (mark position reproducing system side) is selected and the header area is reproduced regardless of the medium. Further, in the processes of S25 to S28, the changeover switch 40 is switched (PR / MO switching) depending on whether the recording field of the medium is the "reproduction-only area" or the "rewritable area", and the "rewritable area" is set to "rewritable area". Changeover switch 3 depending on "mark length recording area"
This is a process for switching 9 (density switching).

In the processes of S29 to S31, the recording field is reproduced with the changeover switch being switched in the above process. The details will be described below.

When the read process is started, first, the control section 32 sends a signal for switching to the PR (reproduction-only area) side to the changeover switch 40, and switches the changeover switch 40 to the a side. And PR of the head 27
The output of the (reproduction-only area) side is input to the read circuit 28 (S21).

That is, the PR side signal from the head 27 is input to the mark length recording binarization circuit 37 and the mark position recording binarization circuit 38. In addition, the control unit 32
Sends a recording density switching signal to the switching switch 39 to switch the switching switch 39 to the d side (S
22). By this switching, the mark position recording binarization circuit 38 side is selected.

In this state, the medium is reproduced and the reproduction of the sector mark (SM) is waited (S23). When the sector mark is reproduced, the control unit 32 controls to reproduce the medium ID (S24).

When the ID of the medium is reproduced, the recording area following it is reproduced. At this time,
The control unit 32 includes a management table setting memory 35.
It is determined whether the recording area to be reproduced next is a "reproduction-only area" or a "rewritable area" by referring to the management table set in step S25.

As a result, in the case of the "rewritable area", the read circuit is switched to the MO (rewritable area) side (S26). In this case, the control unit 32 sends a changeover signal to the MO side to the changeover switch 40, and switches the changeover switch 40 to the b side.

Further, the control unit 32 refers to the management table set in the management table setting memory 35, and determines whether or not the "rewritable area" is the mark length recording system (S27).

As a result, in the case of the mark length recording system,
The control unit 32 is
A density switching signal is sent, and the switch 39 is switched to d.
To the side (S28).

Then, the recording field of the medium is reproduced under the control of the control section 32 (S2
9). After that, the serial-parallel conversion / error correction unit 33 causes the E
CC processing is performed (S30), and data is transferred to the host (S31).

When it is determined in the process (S25) that it is the "reproduction-only area" and when it is determined in the process (S27) that it is the mark position recording method instead of the mark length recording method, The recording field is reproduced as it is without switching the changeover switches 39 and 40 (S29), and the ECC process is performed (S30). After that, the serial-parallel conversion / error correction unit 33 performs ECC processing (S30) and transfers the data to the host (S3).
1). With the above processing, the reproduction processing from the medium is completed.

§11: Description of high-density medium and reproduction signal thereof ... See FIG. 13. FIG. 13 is an explanatory diagram of a high-density medium and reproduction signal thereof. In FIG. 13, A is a stamper, B is a medium substrate, and C
Is an ideal reproduction waveform, D is an actual reproduction signal, and E is a binarization pulse. Further, the left side of the figure shows a reproduction-only area, and the right side shows a rewritable area.

This medium is an example in which the optical disk (medium) of this embodiment shown in FIG. 3 is reproduced, the reproduction-only area is a recording area by the mark position recording system, and the rewritable area is a mark. This is a recording (high-density recording) area by the long recording method.

Information is recorded in the reproduction-only area (on the left side of the drawing) by forming the recording pit (emboss) 3 on the medium base material 2 by molding the stamper 1. In this case, information is recorded by the mark position recording method in which the center of the recording pit 3 corresponds to "1" of the signal (data). Therefore, when this play-only area is played,
At the center position of the recording pit 3, the signal (data) "1" is reproduced.

In the rewritable area (right side of the figure),
Recording pits (or recording domains) 3 are formed by applying a magnetic field and irradiating a laser beam instead of recording by the stamper. In this case, information is recorded by the mark length recording method in which the edges on both sides of the recording pit 3 correspond to "1" of the signal (data). Therefore, when this rewritable area is reproduced, "1" of the signal (data) is reproduced at the positions of the edges on both sides of the recording pit 3.

§12: Description of Medium Playback of FIG. 3 ... See FIG. 14 FIG. 14 is an explanatory diagram of the medium playback of FIG. Below, Figure 1
Based on FIG. 4, description will be made on reproduction of the medium (the medium of the embodiment shown in FIG. 3) by the above processing.

In FIG. 14, A is the medium area and B is the PR.
(Preformat: reproduction only area) / MO (rewritable area) switching state, C is recording density switching state (H /
L) and D are capacities of the respective areas, and E is a user capacity (capacity viewed from the user).

In the PR / MO switching state shown in B, the PR side is set to the high level H (indicating that the changeover switch 40 of FIG. 8 is switched to the a side), and the MO side is set to the low level L (FIG. 8). Showing the changeover of the changeover switch 40 to the side b)).

In the recording density switching state shown in C, the mark position recording system side is set to the low level L (L: low recording density, indicating that the changeover switch 39 is switched to the d side), mark length recording. The system side has a high level H (H:
High recording density is shown, and the changeover switch 39 is shown to be switched to the c side).

The example of FIG. 14 is an example in which the optical disk (medium) shown in FIG. 3 is reproduced by the optical disk device of the above-mentioned embodiment. When reproducing the medium, first, the header is reproduced, and then the recording field is reproduced.

In this reproducing process, when reproducing the first 1 sector (left side in the figure) including the header and the recording field of the reproduction-only area, PR / MO is set to H (P
The R side) is selected, the density is switched to the L side, and the medium is reproduced.

When reproducing the next one sector (right side in the figure) including the header and the recording field of the rewritable area, first, the header is reproduced in the same state as the reproduction of the previous one sector, and thereafter, PR / MO to L
Recording field (rewritable area) by switching to (MO side) and switching the recording density to H side
Play.

In this case, the capacity of each area is as shown in the figure. That is, for the first sector, the header is 52 bytes, and the area for phase synchronization (VFO ₃ , syn) is used.
c) has 15 bytes, and the data field has 639 bytes.

For the next one sector, the header is 52 bytes, and the recording field is high-density (double) recording, so the phase synchronization area (VF) is used.
O _3, sync) is 30 bytes, data field 1
It is 278 bytes.

Subtracting the capacity that cannot be used by the user from the respective capacities, the user capacity is practically 512 bytes for the first sector and 1024 bytes for the second sector.

[0153]

As described above, the present invention has the following effects. : A high density recording medium can be manufactured by using the conventional stamper technology as it is. Further, it is possible to make the medium satisfy the compatibility with the conventional device.

The low recording density of the read-only area in the optical disk of the present invention may be seen as a drawback, but if judged from the purpose of this area of producing a large amount of duplicated data, the conventional apparatus is used. It is a fatal defect that can not be reproduced with.

Therefore, it is of great significance to set the read-only area as the mark position recording area (current standard). : In the conventional high-density medium, the read-only area formed by the stamper is also composed of the mark length recording area. Therefore, due to the variation in the edge of the recording pit, a read error is likely to occur depending on the reproducing technique.

However, in the present invention, since the read-only area formed by the stamper is the mark position recording area, there is no influence of the edge of the recording pit, and the above read error does not occur.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram of a recording method according to an embodiment.

FIG. 3 is a configuration diagram of an optical disc in an example.

FIG. 4 is an explanatory diagram of a medium in an example.

FIG. 5 is an explanatory diagram (ISO / IEC standard) of rules regarding a medium layout in the embodiment.

FIG. 6 is an explanatory diagram of a sector format according to the embodiment.

FIG. 7 is a configuration diagram of an optical disc device in an embodiment.

FIG. 8 is a partial detailed view of FIG. 7.

FIG. 9 is an example of a management table in the embodiment.

FIG. 10 is a processing flowchart when a medium is inserted in the embodiment.

FIG. 11 is a processing flowchart when a read command is received in the embodiment.

FIG. 12 is a flowchart of a read process in the embodiment.

FIG. 13 is an explanatory diagram of a high-density medium and a reproduction signal thereof in the example.

FIG. 14 is an explanatory diagram when reproducing the medium of FIG. 3.

FIG. 15 is an explanatory diagram of a reproduction-only area of a conventional high-density medium.

FIG. 16 is an explanatory diagram when reproducing a conventional mark position recording medium.

FIG. 17 is an explanatory diagram when reproducing a conventional mark length recording medium.

[Explanation of Codes] 15 Optical Disk 16 Rewritable Area 17 Reproduction Only Area (Read Only Area) 19 Optical Disk Device 21 Controller 27 Optical Head 28 Read Circuit 32 Control Section 35 Management Table Setting Memory 37 Mark Length Recording Binarization Circuit 38 Mark Position recording binarization circuit 39, 40 selector switch

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[Procedure amendment]

[Submission date] January 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 5

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction content]

An optical disc having a rewritable area 16 in which data can be rewritten by a user,
In the rewritable area 16, a header area in which a physical address of a sector is recorded by a shape change is an optical disk formed by a recording area by a mark position recording method.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

: Formed on both sides of the recording pit on the optical disc
The generated edges (leading edge, trailing edge) are paired with the signal (data).
Rewritable area 16 by the adapted mark length recording method
Of the rewritable area.
The mark area is recorded in the header area, which is recorded by changing the shape
The optical disc that can reproduce the optical disc 15 recorded by the
In the disk device, the area to be played is marked
When it is determined that the header area is based on the recording method
Re-corresponds the center of the recording pit to the signal (data).
Try to play by selecting the playback method of the mark position
The area is a rewritable area 16 by the mark length recording method.
If it is determined that the edges on both sides of the recording pit
Mark length reproduction method that reproduces in accordance with the signal (data)
An optical disc device provided with means for selecting a formula and reproducing data .

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0068

[Correction method] Change

[Correction content]

[0068] Also in the sector of the rewritable area 16, the the header is a reproduction-only area, is manufactured by molding by the stamper (embossing). Then, only the recording field is set as a rewritable area in which the user can freely rewrite data.

Claims (5)

[Claims] 1. An optical disk having a reproduction-only area (17) for only reproducing data and a rewritable area (16) in which data can be rewritten by a user, wherein the reproduction-only area (17) is an optical disk. The center of the recording pit on the (medium) is composed of the recording area by the mark position recording method corresponding to the signal (data), and the rewritable area (16) is formed on both sides of the recording pit (recording domain) on the optical disc. Edge (leading edge,
An optical disc having a trailing edge formed by a recording area according to a mark length recording method corresponding to a signal (data). 2. An optical disk having a reproduction-only area (17) for only reproducing data and a rewritable area (16) in which data can be rewritten by a user, wherein the rewritable area (16) is An optical disc of a mark length recording method, wherein a header area in which a physical address of a sector is recorded by a shape change is a recording area of a mark position recording method. 3. The optical disk according to claim 1, wherein the reproduction-only area (17) and the rewritable area (16)
The optical disc is characterized in that the recording attribute information indicating the existence of the optical disc and the information (physical address) indicating the position are recorded at a specific position of the optical disc. 4. A rewritable area (1) by a mark length recording method in which edges (leading edge, trailing edge) formed on both sides of a recording pit on an optical disc are made to correspond to signals (data).
6) and a reproduction-only area (1) by the mark position recording method in which the center of the recording pit on the optical disc is made to correspond to the signal (data).
7), and a read-only area (17) and a rewritable area (16)
Of the recording attribute information indicating the existence of the
An optical disk device capable of reproducing an optical disk (15) recorded at a specific position of an optical disk, wherein when the optical disk (15) is inserted, information of the specific position is read and a rewritable area (16 ) Or a reproduction-only area (17), and means (32, 35) for judging the recording method of the area, and the area to be reproduced by the means (32, 35) is mark position recording. When it is determined that the area is the reproduction-only area (17) according to the method, the mark position reproduction method for reproducing the center of the recording pit in correspondence with the signal (data) is selected, and the area to be reproduced is the mark length recording area. When it is determined that the area is a rewritable area (16) according to the method, a mark length reproduction method for reproducing the edges on both sides of the recording pit in correspondence with the signal (data) is selected. To, an optical disk apparatus characterized in that a means (32,37,38,39,40) for reproducing data. 5. The optical disc apparatus according to claim 4, wherein a header area in which a physical address of a sector is recorded by a shape change in the area to be reproduced has a mark position reproducing method regardless of a recording method. An optical disk device characterized by selecting and reproducing.