JP3346073B2 - Disk recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk storage medium capable of recording information at a high density, and more particularly to a sector format of an optical disk for recording information in an orderly manner.

[0002]

2. Description of the Related Art The sector format of a 5.25 "optical disk is specified in a standard ISO 10089 defined by the International Standards Organization (ISO). According to this standard, format A (continuous servo tracking system) is used. The gap section 22 located between the address section 20 and the data section 21 has an ODF (O
ffset Detection flag) 23, G
ap24, FLAG25, ALPC (Auto Las
er Power Control) 26.

[0003]

The conventional format uses an ALPC2 for controlling the power level of the laser.
6 is located at the rear edge of the gap portion 22. for that reason,
The time required for adjusting the laser power cannot be secured between the ALPC 26 and the data section, and there is a problem that recording cannot be performed immediately from the leading edge of the data section.

An object of the present invention is to provide a disk storage medium capable of securing a time required for adjusting laser power.

[0005]

In order to achieve the above-mentioned object, in the present invention, ALPC is written on a sector format as FL.
Place before AG.

[0006]

The FL section is provided between the data section for recording on the sector format and the ALPC6 for adjusting the laser power.
By arranging the AG 8, a response time of power control can be secured, and data can be recorded from the leading edge of the power-adjusted data section.

[0007]

An embodiment of the present invention will be described below. FIG.
Is a sector format of the optical disc according to one embodiment of the present invention. The gap section 3 located between the address section 1 and the data section 2 has an ODF (Offset Detect).
Tion Flag) 4, Gap 5, ALPC (Out
o Laser Power Control) 6, G
ap7, FLAG8, and Gap9. In this embodiment, each byte time (B) is 1B, 2
B, 5B, 4B, 5B, and 1B.

The ODF 4 is a mark for detecting a track offset in tracking error detection using a push-pull method, and has a mirror surface portion without a guide groove. Therefore, the ODF 4 can detect a track offset component due to the inclination of the disk or the like.

The ALPC 6 is a test section for controlling the laser power level, emits a reference light pulse, detects a change in laser power from the level of the reflected light of the light pulse, and keeps the recording power level constant. keep.

The operation of the ALPC will be described with reference to FIG. An optical disk device for recording and reproducing an optical disk 12 having a sector format shown in FIG. 1 according to an embodiment of the present invention includes an optical head 10 and an automatic power control circuit 1.
1. It is composed of a disc 12. Light emitted from the semiconductor laser 13 mounted on the optical head 10 is
It is narrowed down as a minute spot of about 1 micron on the recording film surface on the disk 12 through the prism 15 and the aperture lens 16. Light emitted from the semiconductor laser 13 is reflected by the prism 15 and enters the photodetector 17. The photodetector 17 is a front monitor for automatic power control, and its output is input to the automatic power control circuit 11. The reflected light from the optical disk 12 is guided to a detection optical system and is used for reading information, detecting control signals for automatic focus control and tracking control, but these are not directly related to the present invention. Here, illustration is omitted.

FIG. 4 is a block diagram of the automatic power control circuit 11. The output of the photodetector 17 is the reproduction power control circuit 4
1 is input to the recording power control circuit 42, and the power is stabilized in each circuit. The recording power control circuit 42 emits an adjustment pulse for controlling the recording power via the recording pulse (WRPLS) signal line at the timing of the ALPC on the format, and samples the light component detected by the photodetector 17. And the recording current, that is, the recording power, is controlled such that the value becomes a value specified by the higher-order microprogram.

By doing so, a ZCAV (Zone Cons), which is a recording method having different recording densities on the inner and outer circumferences, is provided.
This is also effective for a system in which the recording power differs depending on the recording position, as in the case of a tangent angular velocity. Since the control time in the recording power control circuit 42 is finite in consideration of the responsiveness of the photodetector 17 and the circuit, the ALPC is set at a timing position in the data portion for recording data, in consideration of the delay time.

The FLAG 8 is a flag indicating that the sector is a recorded sector in order to prevent data abnormalities due to erroneous recording such as overwriting in a write-once optical disk or the like. Record. For example, in the case of the 2-7 modulation code, a repetition pattern of “100100” is used.
In the case of a -7 modulation code, the repetition pattern is "1010". Gap5, Gap7, and Gap9 are unrecorded portions provided for timing adjustment.

[0014]

According to the present invention, the response time of power control is ensured by positioning the position of the ALPC 6 for performing laser power adjustment before the FLAG 8 with respect to the data portion to be recorded on the sector format. After the power adjustment, data recording can be started.

[Brief description of the drawings]

FIG. 1 is a sector format of an optical disc according to an embodiment of the present invention.

FIG. 2 shows a sector format of a conventional optical disc.

FIG. 3 is a block diagram of an optical disc apparatus that performs recording and reproduction of an optical disc according to an embodiment of the present invention.

FIG. 4 is a block diagram of an automatic power control circuit of the optical disk device of FIG. 3;

[Explanation of symbols]

1, 20 ... address part 2, 21 ... data part 3, 22 ... gap part 4, 23 ... OD
F 5, 7, 9, 24 ... Gap 6, 26 ... AL
PC 8, 25: FLAG 11: Automatic power control circuit

Claims (1)

(57) [Claims] 1. An address section, a flag section, and an ALPC section.
And a data storage section,
A disk storage medium having a sector format in which a flag section is arranged between an LPC section and a data section.