JPH0383233A - Recording medium and signal regenerating device - Google Patents

Abstract

PURPOSE:To synchronized reproduction signal detecting displacement in the direction of a track width with a main signal and to use existing LSI and the like by previously recording the frame synchronizing signal of a format equal to the frame synchronous format of main information by means of displacement in the direction of the track width. CONSTITUTION:The frame synchronizing signal with the format the same as the frame synchronizing signal on the track and the same as a CD formed, etc. whose inversed intervals are eleven times as much as a clock cycle and continues twice is previously recorded by displacement in the direction of the track width. Thus, a PLL circuit 30, a synchronous reproduction circuit 31, a control circuit 32 in the RF signal system of a signal reproduction device and a PLL circuit 33, a synchronous reproduction circuit 34 and a control circuit 35 in a magneto-optical signal system come to the same constitution, and LSI used for the RF system can be set identical with those in the magneto-optical signal system. Consequently, existed LSI and the like can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording medium and a signal reproducing device, and in particular, the present invention relates to a recording medium and a signal reproducing device, and in particular, the present invention relates to a recording medium and a signal reproducing device, and in particular, a frame synchronization signal recorded by a width direction displacement of a recording track on which main information is recorded is The present invention relates to a recording medium having the same frame synchronization format as the above, and a signal reproducing device for reproducing the recording medium.

[Summary of the invention]

The present invention relates to a recording medium and a signal reproducing device, and in a recording medium in which main information is recorded on a recording track along the track direction, the same format as the frame synchronization format of the main information is set for each frame serving as an information recording unit. A signal reproducing device that provides a recording medium in which a frame synchronization signal of a cloak is recorded in advance by displacement in the track width direction, and that reproduces such a recording medium, the frame synchronization signal recorded by displacement in the track width direction. The present invention provides a signal reproducing device in which a reproducing circuit and a main information frame synchronization signal reproducing circuit have a rotating configuration.

[Conventional technology]

In a recording medium, for example, a magneto-optical disk, guide grooves (groups) are previously provided on the magneto-optical disk in a spiral or concentric form, and the pre-formed groups or lands between adjacent groups are used as recording tracks;
Data is recorded and reproduced on this track using the magneto-optical effect fII. Synchronization (sync) signals, addresses, data, etc. are alternately recorded on these tracks, and data is managed based on the synchronization signals and address information. In other words, a synchronization signal synchronizes frames (segments) in which data is recorded in predetermined units, and address information allows data to be recorded and played back in frames or blocks (selectors). ing. As the format of these synchronization signals and address information, the so-called CD (Compact Detector) format shown in FIG. 4, for example, is used in consideration of compatibility.

Therefore, when using an optical disc on which nothing has been written (in its initial state), first formatting is performed, and the synchronization signal and address information required for recording/playback of the optical disc are transferred in the track direction, such as magneto-optical signals. You need to write it as . Here, the CD format player will be briefly explained.

In FIG. 4, an l block (l sector) serving as an information recording unit consists of 98 frames from the Oth frame to the 97th frame, and one frame consists of 588 bits.

Each frame includes recording areas for a frame synchronization signal, subcode, and data (including parity). That is, at the beginning of one frame, a 24-bit frame synchronization (No. 3) and a 14-bit subcode area are provided, and these are connected via 3-bit connection bits, and the remaining 544 pins have 32 bits. Sample data and parity data of symbols (32 bytes) are modulated and arranged using the so-called EFM (8-14 modulation) method.The frame synchronization signal is generated by two consecutive 11-bit inversion intervals. This is a so-called out-of-rule pattern that is not found in the EFM method.

By the way, in Japanese Patent Application Laid-Open No. 63-87682, the wobbling track for detecting tracking errors is changed to FM using a time code! l! A technique for forming a record using (ATIP) has been disclosed. In this technology, a sine wave carrier signal of, for example, 20.05 kHz is FM-modulated based on a time code signal with a frequency sufficiently lower than that of the carrier wave to form a wobbling track. In addition to obtaining a tracking error signal, this time code is demodulated to obtain a time code as position information.

[Problem to be solved by the invention]

However, in this prior art, for example, a large scale inch-grained LSI for CD format is required for detecting and processing the tracking signal.
Conventionally used LSI and circuits such as circuits cannot be used, and the time information of this wobbling signal is only one piece of information in one block, so the amount of information is small. If used for data storage, 4. Optical bi-quasobu iF: Accurate positioning was not possible.

The present invention has been made in view of the above-mentioned circumstances,
By recording the frame synchronization signal of a widely used predetermined format such as the CD format as a track width direction displacement, L
The purpose is to provide a recording medium and a signal reproducing device that can use SI and circuits as they are.

(Means for Solving Problem ?R) A recording medium according to the present invention is a recording medium in which main information is recorded along two track directions on a recording track, and the main information is recorded for each frame serving as an information recording unit. The frame sync format is the same as the frame sync format of 3.
This is because the numbers are recorded in advance by displacement in the track width direction.

Next, the signal reproducing device according to the present invention is a signal reproducing device for reproducing a recording medium in which a frame synchronization signal having the same format as the frame synchronization format of main information recorded on a recording track is recorded in advance by displacement in the track width direction. A recording medium according to the present invention, wherein the frame synchronization signal reproduction circuit for the main information and the frame synchronization signal reproduction circuit for the signal recorded by the displacement in the track width direction have the same configuration. Accordingly, the frame synchronization signal from the reproduced signal whose displacement in the track width direction is detected is the same as the frame synchronization signal from the reproduced signal of the main signal recorded on the track.

Further, according to the signal reproducing device according to the present invention, frame synchronization of the main signal on the track can be achieved using a reproduced signal that detects a displacement in the track width direction, and an existing LSI or the like can be used.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the entirety of a magneto-optical disk and the main parts of the tracks, which is an embodiment of the recording medium according to the present invention. For example, in a magneto-optical disk 1 having a magneto-optic effect as a recording medium, a pre-group formed in a spiral shape or a concentric shape, or a land portion between groups is used as a recording track trunk 2, and a magneto-optical signal ( MO signal) is recorded as main information. That is, on this track 2, frame synchronization signals, addresses, and data are recorded alternately in the track direction in accordance with a predetermined format, such as the so-called CD (compact disc) format, and this frame synchronization signal is used to perform frame synchronization. Data is recorded and played back in frames (segments) or blocks (sectors) based on address information.

Further, on the track 2, a frame synchronization signal (sync) signal of the same format as the frame synchronization signal on the track, for example, a frame synchronization signal of the CD format, is recorded in advance by displacement in the track width direction. Specifically, as shown in Fig. 1, the channel clock period in the CD format is T, and the so-called FEM (8-
A frame synchronization signal is recorded and formed as a displacement in the track width direction corresponding to a pattern (out-of-pattern) in which an inversion interval that is not found in the IIT (14 modulation) system is continuous twice. Note that, after this frame synchronization signal, secondary information such as address information may be recorded by displacement in the track width direction.

In this way, the same frame synchronization signal as the frame synchronization signal of the main information on the track is sent to the track l! FIG. 2 shows an embodiment of a signal reproducing apparatus for reproducing signals from a magneto-optical disk previously recorded by displacement.

In FIG. 2, the magneto-optical disk 1 is rotationally driven by a spindle motor 21 at a constant linear velocity (CLV) or a constant angular velocity (CAV). A laser beam from a laser beam B22 such as a laser diode is made into parallel light beams by a collimator lens 23, and then passed through a beam splitter 24.
, is irradiated onto the magneto-optical disk 1 via the objective lens 25.

The reflected beam from the magneto-optical disk 1 is separated by a beam splinter 24, and is incident on a polarizing beam splinter 26 via an optical system 37 such as a 1/2 wavelength plate, a converging lens, and a cylindrical lens.

In this polarizing beam splitter 26, the P-polarized light (polarized light parallel to the plane of incidence) tc component and the S-polarized light (polarized light perpendicular to the plane of incidence) component are separated and incident on photodetectors 27 and 28, respectively.

The detector 27 has a light-receiving surface divided into four parts, for example, and detects a tracking error signal and a focus error signal. The information signal recorded by the displacement in the track width direction is obtained as a high frequency component of the tracking error signal.

Further, the output of the detector 27 is the positive (+) of the differential amplifier 29.
) input terminal, and the output of the detector 28 is input to the negative (-) input terminal of a differential amplifier 29, in which the output of the detector 28 is subtracted from the output of the detector 27. As a result, the magneto-optical signal (MO multiplied signal) recorded magneto-optically on the recording track is reproduced.

The RF signal is supplied to a PLi phase-locked loop (PLi) circuit 30, in which a clock synchronized with the RF signal is regenerated.

Next, in the synchronization reproducing circuit 31, frame synchronization is performed from the synchronization signal and clock in the track width direction recording signal.
Block synchronization is pulled. That is, as shown in FIG. 1, for example, a frame synchronization signal pattern that does not exist in the EFM method is detected, frame synchronization is brought in, and block synchronization is also brought in. Based on these synchronization signals, the control circuit 32 performs constant linear velocity control of the spindle motor 21 and control for seeking (moving) the optical pink amplifier to a target address.

On the other hand, the MO multiplied signal is supplied to the PLL circuit 33 and the signal detection circuit 36. In this PLL circuit 33, a clock synchronized with the MO multiplied signal is regenerated, similar to the RF regeneration described above. Next, in the synchronization reproduction circuit 34, frame and block synchronization is established.

Further, in the control circuit 33, constant linear velocity control of the spindle motor 21 and optical pink-up seek control are performed. In addition, in the signal detection circuit 36, main information (data) recorded on the track along the track direction
is played.

By the way, as mentioned above, by making the format of the frame synchronization (3 flashes) recorded by displacement in the track width direction the same as the format 7 of the frame synchronization signal 9 of the main information, the PLL circuit 30 of the RF multiplied signal , synchronous playback circuit 3
The L control circuit 32 is connected to the MO multiplied signal P i, ! , circuit 30
, the synchronous reproduction circuit 31, and the control circuit 32, and the LSI and circuit used for the RF multiplied signal can be made the same as the conventional LSI and circuit used for the MO multiplied signal. That is, by making the format of the frame synchronization signal recorded by displacement in the track width direction the same as the format of the frame synchronization signal of the CD format, for example, LSI developed for the CD format and widely used can be used as is. can be used.

In addition, by using frame synchronization signals and address information recorded by displacement in the track width direction, P L It is possible to include synchronization 1 of L, constant linear velocity rotation control of the spindle motor 21 in the control circuit 32, subcode decoding, seeking, etc.

In this way, media such as optical disks, on which information such as frame synchronization signals and addresses are pre-recorded by the widthwise displacement of the recording track itself, are mass-produced through a pressing process using a master disk or stand bar after manufacturing the disk. is possible.

Note that the present invention is not limited to the above embodiment, and as shown in FIG. 3, a switch 39 may be provided and the synchronization signal reproduction system may be integrated into one circuit. In this case, when using the switch 39 as an RF multiplied signal, the selection terminal 3 of the switch 39
9a to the non-selection terminal 39b to obtain an MO multiplied signal, the selection terminal 39a of the switch 39 is connected to the non-selection terminal 39b.
b. Since the other configurations and operations are the same as those of the embodiment shown in FIG. 2 described above, corresponding parts will be given the same reference numerals and explanations will be omitted.

(Effects of the Invention) As is clear from the above description, according to the recording medium according to the present invention, the format of the frame synchronization signal recorded by the displacement in the track width direction is changed to the format of the main information recorded on the recording track. By making the formant the same as that of the frame synchronization signal, the synchronization signal reproducing system of the main information and the track width direction displacement recorded information can have the same configuration.

Also, the main information recorded along the track direction has not yet been written on the track (formatting).
Even if the optical disc is not compatible with the existing 1. , S! A signal reproducing device using this can perform PLL synchronization pull-in, spindle motor rotation control, subcode decoding, seeking, etc.

[Brief explanation of drawings]

FIG. 1 shows the configuration of essential parts of an optical disk and a track, which are one embodiment of a recording medium according to the present invention.
FIG. 2 is a block circuit diagram of a first embodiment of the signal reproducing device according to the present invention, and FIG. 3 is a block circuit diagram of a second embodiment of the signal reproducing device according to the present invention. FIG. 4 is a diagram showing the CD format. 1...Magneto-optical disk 2...Track 30.33...PLL circuit 31.34...Synchronized playback circuit

Claims (2)

[Claims] (1) In a recording medium in which main information is recorded along the track direction on a recording track, a frame synchronization signal of the same format as the frame synchronization format of the main information is generated for each frame serving as an information recording unit due to displacement in the track width direction. A recording medium characterized in that a record is formed in advance. (2) A signal reproducing device for reproducing a recording medium in which a frame synchronization signal having the same format as the frame synchronization format of main information recorded on a recording track is recorded in advance by displacement in the track width direction, the main information being recorded on a recording track. A reproducing apparatus characterized in that a frame synchronous signal reproducing circuit for the above-described frame synchronous signal reproducing circuit and a frame synchronous signal reproducing circuit for the signal recorded by the displacement in the track width direction have the same configuration.