JPS62184630A - Optical disk - Google Patents

Abstract

PURPOSE:To record data in an optical disk used exclusively for reproducing by forming photosensitive recording member in all tracks and providing an exclusive data reproducing area in which data are recorded in form of uneven bits and a data recording area having a data field section that is able to record data. CONSTITUTION:A groovelike track 6 divided into plural sectors consisting of sector identifier sections ID and data field sections DF are formed on the disk base 5 of an optical disk 1, and a photosensitive recording member 7 is vapor deposited uniformly over whole face of the optical disk. Signals are recorded in the photosensitive recording member 7 of a data recording area 3 by irradiation of recording laser light of high intensity in forms of change of reflectance or forming of holes. In case the photosensitive member 7 is a photomagnetic material, the recorded signals are read by inverting magnetic domains and using rotation of plane of polarized wave of reflected light by Faraday effect. The photosensitive recording member 7 acts as a reflecting film that reflects reading laser light of low intensity in an exclusive data reproducing area 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical disc for recording and reproducing data, and more particularly to an optical disc that allows additional data to be recorded on a read-only optical disc.

Conventional technology As an external memory that can store large amounts of data, data is recorded on a disk-shaped plastic base material in the form of submicron-order concave and convex focal points, and the data is reproduced by irradiating it with laser light focused to about 1 μm. Read-only optical discs (hereinafter referred to as R/○ discs) are attracting attention.

The R/○ disc is made of plastic resin such as polycarbonate with a thickness of 1.2 mm and has a submicron disc that is modulated by data.
It is made by forming pits with irregularities of the order of magnitude, depositing a reflective layer such as aluminum, and then coating a protective layer on top.It has a diameter of 127M1 and a storage capacity of several hundred megabytes, but it cannot record data. I can't.

R10 disks are being considered for use by taking advantage of their large capacity, ease of random access and mass duplication, and low cost. For example, it is considered to be used as a disk that stores word processor dictionaries and font patterns, or as a disk that stores computer programs and operating manuals.

Problems to be Solved by the Invention However, since the R10 disk described above is for playback only and is manufactured in a dedicated factory, users cannot use their own unique word processor dictionary or phone pattern supplied with the R10 disk. It is not possible to enrich the dictionary by registering font patterns such as kanji as external characters, or by adding words and phrases to the dictionary according to the user's business.

Additionally, programs are often patched to add functionality or fix bugs in the program.

Patches are generally short programs and frequently involve modifications.

Therefore, when a program is supplied with an R10 disk,
Since users cannot record data on R10 disks, program suppliers cannot supply patch programs to users on inexpensive 70 disks, and users are forced to pay the expense of purchasing new R10 disks for minor modifications. It turns out.

Furthermore, creating a new R10 disk every time a program is modified is a burden on the program supplier and is not practical.

Therefore, since the R10 disk can only handle fixed data, there is a problem in that its use in computers is particularly limited.

In view of these points, the present invention provides an optical disc that allows a user to record data on an R10 disc, prevents the read-only area from being accidentally destroyed by recording data, and allows the user to set whether or not data can be written in the data recording area. The purpose is to supply.

Means for Solving the Problems The present invention provides photosensitive recording in all trunks of an optical disk having a track divided into a plurality of sectors having a sector identifier section for recording address information and a data field section for recording data. The optical disk is formed of a member and has a data reproduction exclusive area in which data is recorded in the form of uneven pits, and a data recording area having a data field part in which data can be arranged.

According to the above-described structure, in the data reproduction exclusive area where the same photosensitive recording member as the data recording area is formed,
Only data is reproduced, and in the data recording area, data can be recorded on the photosensitive recording member in the data recording area.

Embodiment FIG. 1 shows an optical disc in an embodiment of the present invention, FIG. 1(, ) is a plan view of the optical disc, and FIG.
It is a sectional view taken along line A-A/ in Figure (,). In FIG. 1, 1 is an optical disk, 2 is a center hole for mounting the optical disk on a disk motor, 3 is a data recording area of a plurality of tracks consisting of sectors having a data field portion DF where no data is recorded, and 4 is a data recording area of a plurality of tracks. A data playback exclusive area of a plurality of tracks consisting of sectors having data field portions DF on which data is recorded in advance; 5 is a disc base material such as polycarbonate resin; 6 is a track formed in a groove shape on the disc base material; 6a is a track formed in a groove shape on the disc base material; Data recording area, 6b
7 is a data reproduction exclusive area, 7 is a photosensitive recording member into which signals are written with a laser beam, and 8 is a protective layer for protecting the photosensitive recording member 7.

31.32,33. ..., Sn is the sector, ID is the sector S1. S2. . . . , a sector identifier section in which address information of Sn is recorded, and DF is a data field section in which data is recorded.

The optical disc 1 has a groove-like track 6 divided into a plurality of sectors consisting of a sector identifier part ID and a data field part DF, formed on a disc base material 6, and on which a photosensitive recording member 7 is spread over the entire surface of the optical disc. It is uniformly deposited.

Signals are recorded in the photosensitive recording member 7 in the data recording area 3 in the form of changes in reflectance and hole formation by irradiation with a strong recording laser beam. When the photosensitive recording member 7 is made of a magneto-optical material, the recorded signal is read out by reversing the magnetic domain and rotating the polarized wavefront of the reflected light due to the 7-Alladay effect.

In the data read-only area 4, the photosensitive recording member 7 functions as a reflective film that reflects the weak intensity reading laser beam.

As described above, according to this embodiment, the data reproduction exclusive area 4
By forming the same photosensitive recording member 7 in the data recording area 3 and the data recording area 3, it is possible to easily manufacture a read-only optical disc having recordable sectors.

FIG. 2 shows the data field identification flag F (F, , F2) of the sector identifier section ID of the optical disc in the above embodiment.
) is an explanatory diagram.

In the figure, Figure 2 (,) is the data field section DF.
Data playback exclusive area 4 where data is recorded in the form of unevenness.
FIG. 2(b) shows the sector format of the data recording area 3 in which the data field portion DF is a groove-shaped track piece with a uniform depth. FIG. 2(C) shows the sector format of the data reproduction area 4. A specific example of the address ADH, data field identification flag F1, and error detection code CRC. FIG. 2(d) shows a specific example of the address ADH, data field identification flag F2, and error detection code CRC of the data recording area 3. This is an example.

In the sector identifier part ID, PR is a preamble for clock reproduction, AM is an address mark indicating the start of address information, ADH is an address, F2 is a data field identification flag indicating data recording area 3, and Fl is data A data field identification flag indicates that the area is a read-only area 4, CRC is an error detection code such as a cyclic code, and PO is a postamble. G1
．． G2 is a gap in which no information is recorded to absorb rotational fluctuations of the optical disc.

In the data field section DF, 5YNC is a clock synchronization signal for clock reproduction, DM is a data mark indicating the start of data, DATA is data, and FCC is an error detection and correction code.

ADH consists of 2 bytes of track address information, track address (high byte) TA (H), track address (low byte) TA (L), and sector address information SA.

The operation of the embodiment shown in FIG. 2 will be explained below.

When the optical disk drive device reads an arbitrary sector identifier part ID, the data field identification flag F is F1=j, for example, as shown in FIGS. 2(C) and 2(d).

F2=o is detected, and the optical disk drive device immediately knows whether this sector belongs to the data reproduction exclusive area 4 or the data recording area 3, and starts recording data to the sector of the data reproduction exclusive area 4 as described later. prohibited.

As described above, according to this embodiment, by providing the data field identification flag F in the sector identifier part ID of the optical disc, data can be recorded in the sector of the data reproduction exclusive area 4 in which the photosensitive recording member 7 is formed. Destruction of the data reproduction exclusive area 4 that occurs can be prevented.

FIG. 3 is an enlarged sectional view of the track of the optical disk of the embodiment. FIG. 3(a) shows the sector identifier part ID, gap G1, and data field part D of the data reproduction exclusive area 4.
3) is a partially enlarged view of the sector identifier section ID, gap G1, and data field section DF of the data recording area.

In FIG. 3, the tracks of the data reproduction only area 4 and the data recording area 3 are both formed with a photosensitive recording member 7, and each sector identifier part ID is a concave and convex pit 8 in which sector address information is stored. In addition, data is recorded in the data field section DF of the data reproduction exclusive area 4 using uneven pits 8, similar to the sector identifier section ID.

The data field portion DF of the data recording area 3 is a groove of uniform depth, and data recorded by the user is recorded on the photosensitive recording member 7 as dots 9 such as changes in density, reversal of magnetic domains, or hole formation.

In order to form the same photosensitive recording member 7 in the data reproduction exclusive area 4 and the data recording area 3, as in the past, a reflective layer such as aluminum is provided in the data reproduction exclusive area 4, and a photosensitive recording member 7 is provided in the data recording area 3. Since there is no need to form the recording member 7 separately, there is no need to provide a special buffer section where no data is recorded at the boundary between the data reproduction only area 4 and the data recording area 3.

FIG. 4 is an external view of an embodiment of the optical disc cartridge of the present invention. In FIG. 4, 10 is a cartridge, 11 is a recording/reproducing window shutter for irradiating laser light onto the optical disc 1, and 12 is a disc of R10 (read only) type, Wlo (postscript) type, and W/E (erasure) type. ) disk identifier to identify the type, etc.
Reference numeral 13 denotes a write protect notch that sets whether or not data can be written to the data recording area 3 of the optical disc 1 (permission/prohibition).

FIG. 5 shows a block diagram of an embodiment of a write protect circuit for permitting/prohibiting data writing to an optical disk of the optical disk drive apparatus of the present invention.

14 is a disk identifier detection unit for detecting the disk identifier 12 of the cartridge, and 16 is a write protector.
a write protect notch detection unit 1 that detects the setting of the notch 13 and outputs a write protect detection signal 101;
6 is an address reading unit that reads address information from the sector identifier ID of a sector and outputs a data field identification flag signal 102; 17 is a disk identifier detection unit 1;
Decode the output of 4 and get the R10 disk detection signal 100
18 and 19 are two NAND gates, 21 is an inverter, 20 and 22 are AND gates, 23 is a laser drive circuit, and 24 is a semiconductor laser.

The operation will be explained below with reference to FIGS. 4 and 6. When the cartridge 10 of the R10 disk is installed in the optical disk drive device, the disk identifier detection section 14 reads the disk identifier 12 of the cartridge 1o, decodes it with the decoder section 17, and outputs the R10 disk detection signal 100. Still, the write protect notch detection section 15 reads the setting of the write protect notch 13 of the cartridge 1o and outputs the write protect detection signal 101. Further, the address reading section 16 reads the address information of the sector identifier ID of the optical disc 1 with a laser beam and outputs the data field identification flag F of the sector identifier ID as a data field identification flag signal 102.

When the data field identification flag signal 1o2 is valid and indicates the data reproduction exclusive area 4, the R10 disc detection signal 100 and the data field identification flag signal 102 are N
AND gate 2o with the output of AND gate 18 low
The output write protect signal 103 is made valid (low).

The write signal 104 is the write protect signal 1030-
Therefore, the laser drive circuit 23 is connected to the AND gate 22.
The input to the semiconductor laser 24 is disabled, and the semiconductor laser 24 never outputs recording power.

When the data field identification flag signal 102 is invalid (low) and indicates data recording area 3, the write protect detection signal 1o1 and the data field identification flag signal 1o
2 is inverted by the inverter 21, and if the write protect detection signal 101 is write-inhibited, the output of the NAND gate 19 is set low, the write protect signal 103 output from the AND gate 20 is enabled (low), and the above-mentioned data is Unlike the read-only area 4, the semiconductor laser 24 does not output recording power.

If the write protect detection signal 101 permits writing, the output of the NAND gate 19 becomes high, invalidating (high) the write protect signal 103 output from the AND gate 2o, and the write data signal 104 becomes the AND gate 2.
2, the laser drive circuit 23 is driven, the intensity of the semiconductor laser 24 is modulated by the recording power output, and the write data signal 104 is recorded in the corresponding sector.

As described above, according to this embodiment, by providing the data field identification flag F in the sector identifier ID portion of the optical disc and by using the disc identifier and write protection notch provided in the cartridge, writing of data in the data reproduction-only area is prevented. In addition to prohibiting writing of data to the data recording area, it is also possible to freely set permission/prohibition of writing data to the data recording area.

As described in detail, according to the present invention, a user can freely record data on an R10 disk, and also write protection can be reliably applied to the read-only area to prevent erroneous recording. Being able to freely set whether or not data can be written in an area has a great practical effect.

[Brief explanation of drawings]

1a and 1b are respectively a plan view and a side sectional view of an optical disc according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the format of an optical disc according to the embodiment, and FIG. An enlarged cross-sectional view, FIG. 4 is an external view of an embodiment of the optical disc cartridge of the present invention, and FIG. 5 is an implementation of a write protect circuit for permitting/prohibiting data writing to the optical disc of the optical disc drive device of the present invention. FIG. 2 is an example block diagram. Fabric base material, 6... Track, 6a...
Data recording area, 6b... Data reproduction exclusive area, 7... Photosensitive recording member, 8... Protective layer, 1o... Cartridge, 11.・・・・・・
・Shutter of recording/reproducing window, 12...Disc identifier, 13...Write protection notch, 14...Disc identifier detection section, 16...
...Write protection notch detection section, 16...
... Address reading section, 17 ... Decoder section, 18゜19 ... 2 manual NAND gate, 20
．． 22... River/AND gate, 21... Inverter, 23... River/Laser drive circuit, 24...
... Semiconductor laser, more... Sector identifier section,
DF...Data field section, PR...River/Frimple, AM...River/Address mark, ADR...
...Address, Fl, F2. F: Cheetah field identification flag, CRC: Error detection code, PQ: Postamble. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure 4

Claims (5)

[Claims] (1) It has a track divided into a plurality of sectors, each having a sector identifier section for recording address information and a data field section for recording data, and a photosensitive recording member is formed on all the tracks to prevent uneven pits. a data recording area having a data playback area in which data is recorded in a shape and a data recording area having a data field portion capable of recording data, and data is recorded by irradiating light onto a photosensitive recording member in a sector of the data recording area. An optical disc characterized by being able to. (2) The optical disc according to claim 1, characterized in that a data field identification flag for distinguishing between a data reproduction-only area and a data recording area is recorded in the sector identifier section. (3) The data field identification flag of the sector identifier section indicates that writing of data to the data field section of the sector is prohibited when the sector is a data reproduction-only area. The optical disc according to scope 2. (4) The optical disc according to claim 1, further comprising information indicating whether or not recording is possible in the data recording area. (5) When the data field identification flag in the sector identifier section indicates that the corresponding sector is a data recording area,
5. The optical disc according to claim 4, wherein data writing to the data field portion of the sector is permitted or prohibited based on information that sets whether or not recording is possible.