JPH0218715A - Optical recording medium and optical recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical recording medium for reading and writing with light and an optical recording/reproducing apparatus using the optical recording medium.

2. Description of the Related Art In recent years, optical recording has been in the spotlight as a high-density recording using a replaceable recording medium.

Hereinafter, an example of a conventional optical recording medium and an optical recording/reproducing apparatus using the optical recording medium will be described with reference to the drawings.

FIG. 6 shows the data structure of one track of a conventional optical recording medium.

Next, FIG. 7 shows the data structure of a sector, where 31 is a sector header, 32 is a servo byte, and 33 is a data area.

FIG. 8 shows the data structure of the sector header, where 34 is a synchronization signal, 35 is a sector address, 36 is a track address, and 37 is a laser recording power setting area.

FIG. 9 shows the data structure of the servo byte, and 38 is a servo focus for tracking the light beam;
39 is an area called a unique distance, and 40 is a mark that determines the unique distance 39.

FIG. 1O is a block diagram of the main parts of a conventional optical recording/reproducing apparatus.

The functions of the optical recording medium configured as described above and the optical recording/reproducing apparatus using the optical recording medium will be explained below. As shown in FIG. 6, each F-rack of the recording medium has 3
It is divided into two minimum information units called sectors.

Each sector consists of 43 minimum recording units (
The servo byte 31 at the beginning of each segment provides servo information to an optical helad (not shown) for signal detection and recording. Further, the sector header 32, which is the first segment in one sector, indicates the position information of the sector, and data is recorded in the data area 33 that follows.

The sector header 32 is further divided as shown in FIG. 8, and the beginning of the sector is detected using the synchronization signal 34, the sector address 35 indicates the position information of the sector, and the track address 3G indicates the existence of the sector. Give trunk information.

After setting the sector position 611 P2, it is necessary to increase the laser power when recording in the data area 33. is monitored and used as a region to determine the laser drive current.

As shown in FIG. 9, the servo bit 32 provides the optical head with a servo signal for trunk tracking using the servo bit 38, and the distance between the servo pit 3B and the mark 40 is as follows in the channel bit string of the data signal. This is an impossible distance and creates a unique distance 39.

The marks 40 of the unique distance 39 are used as synchronization signals on the signal processing side, and the mirror surface between the marks of the unique distance 39 is used to detect a servo signal for tracking the direction of surface vibration. (For example, +30 (International Organization for Standardization) DIS (International Standardization Draft) ISO
/DI39172-2).

Next, a main block diagram of an optical recording/reproducing apparatus using the above-mentioned optical recording medium is shown in FIG. 10, and its operation will be explained below.

The laser 41 is made to emit light and the optical storage medium 42 is illuminated with light.
let Reflected light or transmitted light from the optical storage medium 42 is received by the light receiving means 43 and converted into a signal by the signal detecting means 44.

The signal obtained by the signal detection means 44 is sent to the phase comparison means 45.
Among these signals, the signal from the servo byte 32 is input to the voltage controlled oscillator 46 (VC
The phase of the pulse is compared with the pulse generated by the frequency divider 141.

The voltage of the voltage controlled oscillator 46 is controlled so that the output of the phase comparator 45 is O1, that is, the phases are equal.

The pulse generated by the frequency divider 47 is further frequency-divided by a frequency divider 48 to become a sector synchronization signal synchronized with the sector.

Moreover, when the synchronization signal 34 is detected by the special mark detection means 49 among the signals obtained by the signal detection means 44, the frequency divider 47 and the frequency divider 48 are reset.

Next, sector position information is obtained by the sector recognition means 50 from the sector synchronization signal and the signal obtained by the signal detection means 44, and is notified to the control device 51. The control word 251 gives instructions for reproduction, recording, etc. to the laser control means 52 based on the sector information.

The laser control means 52 adjusts the output of the laser in response to commands from the control device 51, and controls playback, recording, etc.

As mentioned above, in the minimum information unit (sector) of an optical storage medium, an area called a sector head exists separately from the data area, and it is used to obtain sector synchronization signals and sector position information.
It was used as a setting area for laser power. Furthermore, each sector has a plurality of servo parts, which provide servo signals to the optical head, and special marks in the servo parts are also used for synchronization with the signal processing side.

Problems to be Solved by the Invention However, with the above-mentioned recording medium format, a space called a laser power setting area must be provided on the recording medium just for the laser power setting time. On the other hand, this results in wasted time in which no information is obtained, and from the perspective of the medium, there is a problem in that the recording density decreases.

In addition, there is a special mark in each servo bite to obtain a servo synchronization signal, and for this purpose,
Many areas in the media were used.

In view of the above problems, the present invention provides an excellent optical recording medium that eliminates dead space on the medium and an optical recording/reproducing apparatus using the optical recording medium.

Means for Solving the Problems In order to solve the above problems, the optical recording medium of the present invention forms marks different from the data channel bits in the laser power setting area.

Further, an optical recording/reproducing apparatus using the optical storage medium is configured to reset the sector synchronization means in the laser power setting area except during recording, and to prohibit the reset operation during recording.

Operation The optical recording medium of the present invention uses the special mark written in the laser power setting area to reset the sector synchronization, and also removes the special mark from the servo byte to perform optical recording. This means that the waste area on the medium has been eliminated.

Further, the optical recording apparatus of the present invention allows stable use of the above-mentioned excellent optical recording medium regardless of whether it is being reproduced or recorded.

EXAMPLE Hereinafter, an optical recording medium according to an embodiment of the present invention and an optical recording/reproducing apparatus using the optical recording medium will be described with reference to the drawings.

FIG. 1 shows the data structure of one track of a recording medium in an embodiment of the present invention.

FIG. 2 shows the data structure of the minimum information unit (sector) of a recording medium, where ■ is a sector address, 2 is a servo byte, 3 is a laser power setting area, and 4 is a data area.

Further, FIG. 3 shows the laser power setting area 4, where 5a and 5b are marks and 6 is a unique distance.

Figure 4 shows the data structure of the servo byte.
7 is a synchronization mark, 8 is a sample bit, 9 is a track address, and 10 is a mirror surface portion.

FIG. 5 is a block diagram of the main parts of the optical recording/reproducing apparatus of the present invention.

The functions of the optical recording medium configured as above and the optical recording/reproducing apparatus using the optical recording medium will be explained.

In FIG. 1, each trunk is divided into 22 minimum information units called sectors.

Each sector consists of 78 minimum recording units (as shown in Figure 2).
The servo byte 2 at the beginning of each segment provides servo information to an optical head (not shown) for signal detection and recording. Also, ■ sector 1~
Sector address 1 in the second segment indicates sector position information, and data is recorded in the subsequent data area 4.

After confirming the sector position using sector address 1, it is necessary to increase the laser power when recording data in data area 4. To set the power, monitor the laser power and adjust the laser drive current. Laser power setting area 3 is used as the area for determining.

In the laser power setting area 3, as shown in FIG.
Marks 5a and 5b are carved, and the distance between these two marks is a distance that cannot exist in a channel pit row of a data signal, forming a unique distance 6.

By recognizing this unique distance 6 on the signal processing side, it is possible to know that the sector starts from the third segment from the perspective of the segment that includes this unique distance 6, and also because of the mark 6. , sector synchronization can be reset on the signal processing side.

Next, in the servo bite 2, as shown in FIG. 4, the synchronization mark 7 is used to synchronize with the signal processing side, and the sample pit 8 is used as a servo signal for track following of the optical head. Also, since the unique distance 6 has been taken into the laser power setting area 3, it is no longer necessary during the servo bite, and instead, the track address 9 is written in the servo bite 2, and the track address 9 is written in the servo bite 2. Used for position fil during movement. Behind the track address 9, there is a mirror surface section 10, which is used to detect a signal for following the direction of surface vibration.

Next, the main block diagram of an optical recording/reproducing apparatus using the above-mentioned optical storage medium is shown in FIG. 10, and its operation will be explained below.

The laser 11 is caused to emit light, and the optical storage medium 12 is irradiated with light. Reflected light or transmitted light from the optical storage medium 12 is received by the light receiving means 13 and converted into a signal by the signal detecting means 14.

The signal obtained by the signal detection means 14 is sent to the phase comparison means 15.
Among these signals, the signal due to the synchronization mark 7 in the servo byte 2 is converted into a pulse generated by a voltage controlled oscillator 16 (called a VCO) and divided by a frequency divider 17 by the phase comparison means 15. The phase is compared with Phase comparison means 15
The voltage of the voltage controlled oscillator 16 is controlled so that the outputs of the oscillator 16 have the same phase.

The pulse generated by the frequency divider 17 is further frequency-divided by the frequency divider 1B to become a sector synchronization signal synchronized with the sector.

When the unique distance 6 is detected by the special mark detection means 19 among the signals obtained by the signal detection means 14, the frequency divider 17 and the frequency divider 18 are reset.

From the sector synchronization signal and the signal obtained by the signal detection means 14, the sector recognition means 20 obtains sector position information, and the control device ll! 21 will be informed.

The control device 21 gives instructions for reproduction, recording, etc. to the laser control means 22 based on the sector information.

The laser control means 22 adjusts the output of the laser and controls reproduction, recording, etc. according to commands from the control device 21.

Furthermore, during recording, the laser control means 22 is in the process of adjusting the laser power necessary for recording in the laser power setting area, so the signal obtained during that time becomes unstable. Therefore, the reset operation upon detection of unique distance 6 is prohibited during recording.

Effects of the Invention As described above, the optical storage medium of the present invention recognizes the beginning of the minimum information unit (sector) by providing a special mark in the laser power setting area, and also resets sector synchronization on the signal processing side. Therefore, the laser power setting area can be effectively used, and there is no need to set aside a special area for obtaining a reset signal for sector synchronization.

Furthermore, special marks for synchronization can be eliminated from the servo byte, which has the effect of reducing the length of the servo byte, or allowing other information such as track addresses to be included in the servo byte. .

Furthermore, the optical recording and reproducing apparatus of the present invention can use the optical storage medium described above, and has the advantage that it is stable during both reproduction and recording by inhibiting sector synchronization during recording.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1, FIG. 2, FIG. 3, FIG. 4, and FIG. 5 are diagrams relating to an embodiment of the present invention.
+- rack data structure diagram, Figure 2 is a sector data structure diagram, Figure 3 is a detailed diagram of the laser power setting area, Figure 4 is a servo byte data structure diagram, and Figure 5 is an optical recording/reproducing device data structure diagram. Figures 6, 7, and 8 are block diagrams of the main parts. 9 and 10 are diagrams related to the conventional example. FIG. 6 is a data structure diagram of one track of an optical recording medium, FIG. 7 is a sector data structure diagram, and FIG. 8 is a sector header data diagram. Structure diagram, Figure 9 is a detailed diagram of the servo bite, Figure 10
The figure is a block diagram of the main parts of the optical recording/reproducing device. l... Sector address, 2... Servo byte, 3... Laser power setting area, 4...
...Data area, 5a, 5b...Mark,
6...Unique Distance, 7...
・Synchronization mark, 8...Sample pit, 9...
...Track address, 10...Mirror part,
11... Laser, 12... Optical storage medium, 13... Light receiving means, 14... Signal detection means, 15... Phase comparison Means, 16...
...Voltage controlled oscillator (VCO), 17... Frequency divider, 18... Frequency divider, 19... Special mark detection means, 20... Sector recognition means, 21
...Control device, 22...Laser control means, 31...Sector header, 32...
Servo byte, 33... Data area, 34...
... Synchronization signal, 35 ... Sector address, 36 ... Track address, 37 ...
...Laser power setting area, 3 days...Servo pit, 39...Unique distance, 40
...Mark, 41...Laser, 42.
... Optical storage medium, 43 ... Light receiving means, 4
4... Signal detection means, 45... Phase comparison means, 46... Voltage controlled oscillator (VCO),
47... Frequency divider, 48... Frequency divider, 4
9... Special mark detection means, 50...
Sector recognition means, 51...Control device, 52...
...Laser control means. Name of agent Patent attorney Shigetaka Awano 1 person 7- Synchronization 7-ri 8- Punpu A/B, To figure figure 6-: L two-gue, 5 stance figure figure figure J

Claims (2)

[Claims] (1) Divided into multiple sectors, each sector includes an address area containing address information for that sector, and a recording power setting area located after this address area for setting the laser power to the recording power. , an optical recording medium having a data area located after the recording power setting area and for recording data to be recorded, and in the recording power setting area, a special pattern that exists only in this area is recorded. An optical recording medium characterized by: (2) An optical recording and reproducing apparatus using the optical recording medium according to claim (1), in which during reproduction, a laser is emitted at a low output that does not affect the optical recording medium, and during recording,
a laser control means that sets the output of the laser to a high recording power in a recording power setting section after reading the address of the sector to be recorded at the low output; and a synchronization signal synchronized with the sector by frequency dividing the clock. In addition to obtaining
An optical recording and reproducing apparatus, comprising sector synchronization means for detecting a special mark and resetting the phase of the frequency division, and prohibiting the sector synchronization means from performing the reset operation during recording.