JPH03296923A - Optical disk - Google Patents

Abstract

PURPOSE:To eliminate high-speed switching between controlling modes for writing and reading of an optical disk drive unit by providing a non-defined gap area before the address part formed at the top of each sector, so that the optical disk drive unit can switch controlling of writing and reading during this gap area. CONSTITUTION:The recording area in the track of each sector in an optical disk contains the address area 7 where the sector address and track address are preliminarily written and a servo bite area 6a where information to start the servo mechanism of the disk drive unit is written. Also, there are provided a data area 5 where a user can record data, a servo bite area 6b1 same as the servo bite area above mentioned, a gap area 8 corresponding to the traveling time of the beam as long as several musec, and a servo bite 6b2. In this gap area 8, the optical disk drive unit can switch controlling of writing and reading. Since this nondefined are 8 is provided, high-speed switching between controlling of writing and reading is not required for the optical disk drive unit.

Description

[Detailed description of the invention] Industrial applications The present invention relates to optical discs.

BACKGROUND ART FIG. 2 shows a conventional optical disc, on which concentric or spiral tracks are formed as recording areas, and each trunk is divided into a plurality of sectors in the radial direction of the optical disc. There is.

The recording area of the track for each sector includes an address section 7 in which sector addresses and track addresses are written in advance, a servo byte section 6a in which information for starting the servo of the optical disk drive device is written in advance, and a servo byte section 6a in which data is written by the user. The servo byte section 6b is composed of a data section 5 which can be used as a servo byte section 6b, and a servo byte section 6b.

When an optical disk drive device drives an optical disk having the above configuration, after writing data in the data section 5, a beam is emitted from the last servo byte section 6b of the sector to the address section 7.
When moving from the servo byte section 6a to the data section 5, the writing control shifts to the reading control, and when moving from the servo byte section 6a to the data section 5, the reading control shifts to the writing control.

Problems to be Solved by the Invention However, in the above-mentioned conventional optical disk, since the distance between the servo bite section 6b and the address section 7 is very small (for example, the beam travel time is several hundred nanoseconds), the optical disk drive device has to control writing and reading. There is a problem in that control must be switched at high speed.

In particular, the high-frequency superimposition circuit used in optical disk drives to reduce noise in read signals requires a time of several jSeC to rise, and the optical disk drive uses this high-frequency superposition circuit when transitioning from write control to read control. There is a problem that a circuit cannot be used.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide an optical disc that does not require an optical disc drive to switch between write control and read control at high speed.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an undefined gap section in front of the address section formed at the beginning of each sector, and the optical disk drive performs writing between this gear section. It is designed to switch between control and read control.

Operation Since the present invention provides an undefined gap portion with the above configuration, there is no need for the optical disk drive to switch between write control and read control at high speed.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing an embodiment of an optical disc according to the present invention, and the same constituent members as those shown in FIG. 2 are given the same reference numerals.

In FIG. 1, concentric or spiral tracks serving as recording areas are formed on this optical disc, and each track is divided into a plurality of sectors in the radial direction of the optical disc.

The recording area of the track for each sector includes an address section 7 in which sector addresses and track addresses are written in advance, a servo byte section 6a in which information for starting the servo of the optical disk drive device is written in advance, and a servo byte section 6a in which data is written by the user. a data section 5 that can be used, a similar servo bite section 6bl, a gear section 8 corresponding to the beam travel time of approximately several μsec, and a similar servo bite section 6b2.
It is composed in this order.

When the optical disk according to the above configuration is driven by an optical disk drive device, when the beam moves from the servo bite section 6bl to the gap section 8 after writing data in the data section 5, the write control shifts to the read control, and When moving from the servo byte section 6a to the data section 5, the read control shifts to the write control.

Therefore, according to the above embodiment, the optical disk drive device can start up the high frequency superimposition circuit when moving from this servo bite section 6b1 to the gap section 8, and therefore, the information read signal of the subsequent address section 7 can be activated. Noise can be reduced.

As described in detail, the present invention provides an undefined gap section before the address section formed at the beginning of each sector, and the optical disk drive device switches between write control and read control between this gap section. This eliminates the need for the optical disk drive to switch between write control and read control at high speed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of an optical disc according to the present invention, and FIG. 2 is an explanatory diagram showing a conventional optical disc. 5. Data section, 5a, 5bl, 6b2 Servo byte section, 7. Address section, 8. Gap section.

Claims (1)

[Claims] An optical disc characterized in that an undefined gap part is provided before an address part formed at the beginning of each sector, and write control and read control of an optical disc drive are switched between this gap part.