JPH0736224B2 - Optical disc and its drive - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc and a drive device for recording and reproducing data, and more particularly to an optical disc and a drive device capable of additionally recording data on a read-only optical disc.

Conventional technology As an external memory that can store a large amount of data, data is recorded on a disk-shaped plastic substrate in the form of pits with irregularities of the submicron order, and the data is reproduced by irradiating it with a laser beam focused to about 1 μm. Optical discs and drive devices using dedicated optical discs (hereinafter referred to as R / O discs) have been receiving attention.

R / O discs have 1.2 mm thick plastic resin such as polycarbonate with data-modulated pits of sub-micron order unevenness, and a reflective layer such as aluminum is vapor-deposited, after which a protective layer is applied. I did it,
Although it has a diameter of 12 cm and a storage capacity of several hundred megabytes, it cannot record data.

The R / O disk is considered to be used by taking advantage of its large capacity, random access, and easy mass copying, and its low price. For example, it is considered to be used as a disk storing a dictionary or a font pattern of a word processor or a disk storing a program operation manual of a computer.

Problems to be Solved by the Invention However, since the R / O disc as described above is a read-only disc and is manufactured in a dedicated factory, the R / O disc has a dictionary or font pattern supplied by the word processor. Users can register their own font patterns such as Chinese characters as external characters, or add words and phrases to the dictionary to enhance the dictionary according to the user's work. I couldn't patch it to fix the bug inside.

For this reason, a light-sensitive member is formed on the entire surface of the R / O disk as a reflective layer, and a data field identification flag for distinguishing the data read-only area from the data recording area is provided in the sector identifier section for data recording. An optical disk and an optical disk drive have been proposed first. In this optical disc, by using the data field identification flag of the sector identifier part, the read conditions of the read signals of the data read-only area and the data recording area are optimized, and each area is read well. However, since the bit error rate of the optical disk is not good, the sector identifier part may not be read correctly. In particular, when the data field identification flag of the first sector cannot be correctly read at the boundary between the reproduction area and the data recording area, the reproduction signal cannot be optimally read without knowing whether the sector is the reproduction area or the data recording area. There was a point.

In view of the above points, the present invention has an object to provide an optical disk and a drive device that allow a user to record data on an R / O disk and read well the data in the data reproduction exclusive area and the data recording area. .

Means for Solving the Problems According to the present invention, a photosensitive recording member is formed on all tracks, and a plurality of sectors having a sector identifier portion for recording address information and a data field portion for recording data are formed on the tracks. It has a data reproduction exclusive area in which data is recorded in the data field portion in the form of concave and convex pits and a data recording area composed of the data field portion in which data can be recorded, and the data reproduction is performed in the sector identifier portion. An optical disc having a data field identification flag for distinguishing a dedicated area from the data recording area, and having at least one dummy sector having no data signal in the data field portion at the beginning of the data reproduction dedicated area and / or the data recording area. , And detecting a data field identification flag in the optical disc Based on the detected data field identification flag, the control means for controlling the read conditions of the reproduction signal of the optical disk to be respectively optimized in the data reproduction exclusive area and the data recording area, and the sector An optical disk drive device comprising: a data reading unit that reads a data field portion of a sector by detecting a sector identifier portion or a sector identifier portion preceding the sector.

Operation The present invention detects the data field identification flag from the sector identifier portion of the preceding sector and detects the waveform equalization amount and the binarization level of the reproduced signal even when a read error occurs in the sector identifier portion due to the above-described configuration. The reading conditions are controlled to optimize the reading of data in the data read-only area and the data recording area.

Practical Example FIG. 3 shows an optical disk applied in an embodiment of the present invention. FIG. 3 (a) is a plan view of the optical disk and FIG. 3 (b) is AA 'in FIG. 3 (a). FIG. Third
In the figure, 1 is an optical disk, 2 is a center hole for mounting an optical disk on a disk motor, 3 is a data recording area of a plurality of tracks including sectors having a data field portion DF in which no data is recorded, and 4 is data in advance. Area for exclusive use of data reproduction of a plurality of tracks having a sector having a data field portion DF in which is recorded, 5 is a disk base material such as polycarbonate resin, 6 is a track formed on the disk base material, and 6a is a data recording area area , 6b
Is a data read-only area, 7 is a light-sensitive recording member in which a signal is written by laser light, and 8 is a protective layer for protecting the light-sensitive recording member 7. S1, S2, S3, ... Sn are sectors,
ID is a sector identifier section in which address information of the sectors S1, S2, ..., Sn is recorded, and DF is a data field section in which data is recorded.

The optical disc 1 has a sector identifier part ID and a data field part
Groove-shaped track 6 divided into multiple sectors consisting of DF
Is formed on the disk base material 5, and the photosensitive recording member 7 is uniformly vapor-deposited on the entire surface of the optical disk.
The light-sensitive recording member 7 in the data recording area 3 is recorded with a signal in the form of a change in reflectance or a hole formed by irradiation with a recording laser beam having a high intensity. In the data reproduction-only area 4, the photosensitive recording member 7 functions as a reflective film that reflects the reading laser light of weak intensity.

As described above, according to FIG. 3, by forming the same photo-sensitive recording member 7 in the data reproduction exclusive area 4 and the data recording area 3, it is possible to easily manufacture the data reproduction exclusive optical disk having recordable sectors. To Further, it is not necessary to specially provide a buffer section for recording no data on the boundary between the data reproduction exclusive area 4 and the data recording area 3.

FIG. 4 is an explanatory diagram of the data field identification flags F (F ₁ , F ₂ ) of the sector identifier portion ID of the optical disc in the above embodiment.

In FIG. 4, (a) is a sector format of the data reproduction exclusive area 4 in which data is recorded in the data field section DF in the form of concavities and convexities, and (b) is a uniform depth of the data field section DF. The sector format of the data recording area 3 which is a groove-shaped track piece is shown in FIG. 4 (c), which is a specific implementation of the address ADR of the data reproduction exclusive area 4, the data field identification flag F ₁ , and the error detection code CRC. For example, FIG. 4D shows a specific embodiment of the address ADR of the data recording area 3, the data field identification flag F ₂ , and the error detection code CRC.

In the sector identifier portion ID, PR is a preamble for clock reproduction, AM is an address mark indicating the start of address information, ADR is an address, F ₂ is a data field identification flag indicating that the data recording area 3 is present, and F ₁ is A data field identification flag indicating the data reproduction-only area 4, CRC is an error detection code such as a cyclic code, and PO is a post-apple. G1 and G2 are gaps in which information for absorbing rotation fluctuation of the optical disc is not recorded.
In the data field portion DF, SYNC is a clock synchronization signal for clock reproduction, DM is a data mark indicating the beginning of data, DATA is data, and ECC is an error detection / correction code.

The ADR is composed of track address information of 2 bytes, track address (high byte) TA (H), track address (low byte) TA (L), and sector address information SA.

In the embodiment shown in FIG. 4, when the disk drive reads an arbitrary sector identifier portion ID, the data field identification flag F will be F ₁ =, as shown in FIGS. 4 (c) and 4 (d).
1, F ₂ = 0, the optical disk drive knows whether this sector is in the data reproduction exclusive area 4 or the data recording area 3 and, as will be described later, the data reproduction exclusive area 4 and the data recording area 3 Optimum control of the reading condition of the playback signal of.

FIG. 5 is an enlarged sectional view of a track of the optical disc of the above embodiment. 5A shows a partially enlarged view of the sector identifier portion ID, the gap G1, and the data field portion DF of the data reproduction exclusive area 4, and FIG. 5B shows the sector identifier portion ID of the data recording area and the gap G1. FIG. 5 (c) is a waveform diagram of a reproduced signal in the data recording area of FIG. 5 (b).

In FIG. 5, the light-sensitive recording member 7 is formed on both the tracks of the data reproduction exclusive area 4 and the data recording area 3, and the sector address information is formed by the pits 8 having irregularities for each sector identifier ID. In addition, the data field portion DF of the data reproduction exclusive area 4 is the sector identifier portion ID.
Data is recorded in the concave and convex pits 8 similarly to.

In the data field portion DF of the data recording area 3, the data recorded by the user is recorded in the light-sensitive member 7 as dots 9 such as density change, magnetic domain inversion or hole formation. As shown in FIG. 5 (c), the reproduction amplitude A1 of the portion 8 of the pid is different from the reproduction amplitude A2 of the portion 9 of the dot. When the groove depth is wavelength / 8 and the phase change recording material is vapor-deposited, the reflectance generally satisfies the relationship of dot part> land part> pit part, and the optical characteristics of the pit part and the dot part are Since they are different, the frequency characteristics of the reproduced signal may also be different. Therefore, as will be described later, the data recording area 3 and the data reproduction exclusive area 4
It is necessary to control the waveform equalization amount and the binarization level with and.

FIG. 1 is a track layout diagram of the optical disk of the present invention.
FIG. 1A shows an embodiment of a track arrangement in which the data reproduction exclusive areas 4a, 4b and the data recording area 3a are divided in sector units. Track 0, sector S0 to track 2, sector S1
Data reproduction signal area 4a up to, track 2, sector S2
To data recording area 3a from track i + 1 to sector S0
And track i + 1, sector S1 to track n, sector
It is composed of a data reproduction exclusive area 4b up to Sn. The dummy sector DS1 of the track 2 and the sector S2 belongs to the data recording area 3a provided at the boundary between the data reproduction exclusive area 4a and the data recording area 3a.

The dummy sector DS2 of the track i + 1 and the sector S1 is provided at the boundary between the data recording area 3a and the data reproduction exclusive area 4b and belongs to the data reproduction exclusive area 4b.

FIG. 1 (b) shows an embodiment of a track arrangement in which the data reproduction exclusive areas 4c, 4d and the data recording area 3b are divided in track units. Data from track 0, sector S0 to track i-1, sector Sn It is composed of a read-only area 4c, a data recording area 3b from track i, sector S0 to track 1-1, and sector Sn, and a data read-only area 4d from track 1, sector S0 to track n, and sector Sn. .

Two dummy sectors DS3a for track i, sectors S0, S1,
The DS 3b is provided at the boundary between the data reproduction exclusive area 4c and the data recording area 3b and belongs to the data recording area 3b. The two dummy sectors DS4a and DS4b of the track 1 and the sectors S0 and S1 are provided on the boundary between the data recording area 3b and the data reproduction exclusive area 4d and belong to the data reproduction exclusive area 4d.

Dummy sectors DS1 and DS3 belonging to data recording areas 3a and 3b
Each of a and DS3b comprises a sector identifier portion ID having a data field identification flag F indicating a data recording area and a data field portion DF in which no data is recorded. Dummy sectors DS2 and DS4 belonging to the data reproduction-only areas 4b and 4d
Each of a and DS4b includes a sector identifier portion ID having a data field identification flag F indicating a data reproduction exclusive area and a data field portion DF in which no data is recorded in advance.

According to FIG. 1, as will be described later, even if the sector cannot be found due to an error in the sector identifier portion ID of the sector in which the data is recorded, the data read-only area 4b or the head of the data recording area 3a, 3b By using the data field identification flag of the sector identifier portion ID of the dummy sector, the reproduction signal can be read from each area under appropriate read conditions.

FIG. 2 is a block diagram of a data reading circuit for reproducing data from the optical disk of the optical disk drive of the present invention. In FIG. 2, 10 is a reproduction signal 100.
, A data equalization binarization unit for binarizing an analog signal and a waveform equalization unit for compensating the deterioration of the frequency characteristics of the signal, and a data demodulation unit 11 for digitally demodulating the output of the data equalization binarization unit 10.
Reference numeral 12 is a data field identification flag signal 102, and a level control portion for generating a level control signal 103 for controlling the waveform equalization amount and the binarization level of the data equalization / binarization portion 10, and 13 is address information from the sector identifier portion ID. And an address reading unit that reads the data field identification flag F, 14 is an address comparing unit that detects a match between the target address signal 104 and the read address signal 101, and outputs an address match signal 105, and 15 is the data demodulation of the target sector. Data demodulation enable signal 106 for generating target demodulation address signal 104 and detecting address coincidence signal 105 and activating data demodulation section 11
Is a control CPU that outputs

The operation of the optical disk drive shown in FIG. 2 will be described below.

When the optical disk is loaded in the optical disk drive, the address reading section 13 reproduces the sector identifier section ID of the optical disk with laser light, reads the address information of the sector identifier section ID and the data field identification flag, and outputs the address signal.
101 and a data field identification flag signal 102 are output.

The waveform equalization amount and the binarization level of the address reading unit 13 are set to the level of the data reproduction exclusive area 4.

The data field identification flag signal 102 is the level control unit 1
By changing the level control signal 103 of 2, the reproduction signal
The waveform equalization amount and the binarization level that minimize the bit error rate of the read data signal 107 when 100 is demodulated by the data demodulation unit 11 are set in the data equalization binarization unit 10. For example, taking a binary level as an example, when the data field identification flag signal 102 indicates a data reproduction-only area, the level control signal 103 is the amplitude A1 of the reproduction signal of the sector identifier portion ID in FIG. 5 (c). Data equalization 2 with 1/2 binarization level
When the data field identification flag signal 102 established in the quantizing unit 10 indicates the data recording area, the level control signal 1
03 sets the binarization level of 1/2 of the amplitude A2 of the reproduced signal of the data field section DF of FIG. 5 (c) to the data equalization binarization section 10.

The control CPU 15 outputs the target address signal 104 to the address comparison unit 14, and the address comparison unit 14 outputs the address match signal 105 when the read address signal 101 matches the target address signal 104.
Is output. When the control CPU 15 detects the address coincidence signal 105, it outputs the data demodulation enable signal 106 to the data demodulation unit 11 to activate the data demodulation operation. The data demodulation unit 11 outputs a read data signal 107 by digitally demodulating the reproduction signal binarized by the data equalization binarization unit 10.

If the address match signal 105 is not detected, the control CPU15
Outputs a target address signal 104 having an address value of (target address value-1) to the address comparison unit 14, and the address comparison unit 14 outputs an address match signal 105 when the read address signal 101 matches the new target address signal 104. To do.
The data field identification flag signal 102 read from the sector corresponding to the target address signal 104 having the address value (target address value-1) is the data equalization binarization unit 1.
The level control signal 103 that provides 0 for optimum reading is supplied. Next, the control CPU 15 detects the address coincidence signal 105, waits for a time corresponding to one sector, and then outputs the data demodulation enable signal 106 to the data demodulation section 11 to activate the data demodulation operation of the target sector. Dummy sector of FIG. 1 (a)
DS1 and DS2 correspond to the above case.

Furthermore, even if (target address value-1), the sector identifier part ID
If an error occurs, the two dummy sectors DS3a, DS3b or DS4a, DS4b shown in FIG. 1 (b) are used to set the address value (target address value-1) and the address value (target address value-2). By using the target address signal 104, the optimum binarization level and waveform equalization amount can be set with high reliability, and the reliability of data reading can be improved. When an address value of (target address value-2) is set in the target address signal 104, the control CPU 15 detects the address match signal 105, waits for a time corresponding to two sectors, and then outputs the data demodulation enable signal 106 to the data demodulation unit 11. To read the target sector.

As described above, according to the present embodiment, when detecting the data field identification flag of the sector identifier section of the optical disc, dummy sectors are provided in the first sector of the data reproduction exclusive area and the data recording area, and the dummy sector is used. By executing the error recovery processing of the identifier, the data field identification flags of the sectors in the entire area are detected with high reliability, and the data is read to correct the difference in the reproduced signal amplitude and the difference in the frequency characteristic of the data field part. By controlling the reading conditions, it is possible to provide an optical disc and a drive device that can read data from an R / O disc having a data recordable area with high reliability.

EFFECTS OF THE INVENTION As described above, according to the present invention, there is provided an optical disk drive device in which a user can freely record data on an R / O disk and at the same time, read data from the data reproduction exclusive area and the data recording area satisfactorily. The practical effect of the provision is great.

[Brief description of drawings]

FIG. 1 is a track layout diagram of an optical disk of the present invention, FIG. 2 is a block diagram of an embodiment of a data reading circuit for reproducing data of an optical disk of an optical disk drive device of the present invention, and FIGS. FIG. 4 is a plan view and a side view of an embodiment of an optical disc applied to the present invention, FIG. 4 is a format explanatory view of the optical disc in the same embodiment, and FIG. 5 is an enlarged sectional view of tracks of the optical disc of the same embodiment. 1 ... Optical disc, 2 ... Center hole, 3, 3a, 3b ... Data recording area, 4, 4a, 4b, 4c, 4d ... Data reproduction dedicated area,
5 ... Disk base material, 6 ... Track, 6a ... Data recording area, 6b ... Data reproduction only area, 7 ... Photosensitive recording member, 8 ... Protective layer, 10 ... Data equalization binary Akabe, 11
...... Data demodulation unit, 12 ...... Level control unit, 13 ...... Address reading unit, 14 ...... Address comparison unit, 15 ...... Control CP
U, ID …… Sector identifier part, DF …… Data field part, PR …… Preample, AM …… Address mark, ADR
...... _{addresses, F 1, F 2, F} ...... data field identification flag, CRC ...... error detection code, PO ...... postamble, DS1, DS2, DS3a, DS3b , DS4a, DS4b ...... dummy sector.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yuzuru Kuroki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Yuji Takagi, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A light-sensitive recording member is formed on all tracks, and a plurality of sectors having a sector identifier portion for recording address information and a data field portion for recording data are formed on the tracks, and uneven pits are formed. A data read-only area in which data is recorded in the data field section and a data record area including the data recordable data field section, and the sector read-only area is provided with the data read-only area and the data record area. And a data field identification flag for distinguishing between the data reproduction area and the data recording area, and / or at least one dummy sector in which no data is recorded in the data field portion at the beginning of the data recording area. optical disk. 2. The optical disk according to claim 1, wherein the dummy sector is provided in track units. 3. A light-sensitive recording member is formed on all tracks, and a plurality of sectors having a sector identifier portion for recording address information and a data field portion for recording data are formed on the tracks, and uneven pits are formed. A data read-only area in which data is recorded in the data field section and a data record area including the data recordable data field section, and the sector read-only area is provided with the data read-only area and the data record area. Data is recorded on an optical disc having a data field identification flag for distinguishing between and, and having at least one dummy sector at the beginning of the data reproduction exclusive area and / or the data recording area in which data is not recorded in the data field section. Check the data field identification flag in the optical disk drive for playback. And a control means for controlling the read condition of the reproduction signal to be optimum in the data reproduction exclusive area and the data recording area based on the detected data field identification flag, and the target sector or the target sector. Data read means for reading the data field portion of the target sector by detecting the sector identifier portion of the sector preceding the sector, and the control means can correctly read the sector ahead of the sector when the data field identification flag of the sector cannot be read correctly. An optical disk drive device, wherein a read condition of a reproduction signal is optimally controlled by a data field identification flag of an identifier section. 4. The optical disk drive apparatus according to claim 3, wherein the control means optimally controls the read condition of the reproduction signal by the data field identification flag of the sector identifier section of the dummy sector.