JP3031513B2 - Optical disc, recording method thereof, and optical disc apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus capable of optically recording and reproducing information, and more particularly to an optical disk which is effective for recording image information and the like, a recording method thereof, and an optical disk. Related to the device .

[0002]

2. Description of the Related Art In general, an optical disk apparatus capable of optically recording and reproducing information records information by irradiating a laser beam and physically changing the surface of the optical disk where the laser beam is irradiated. It was carried out, and performs reproduction of information by detecting the change is allowed are <br/> was partially optically.

As an example of this type of optical disk apparatus, for example, a crystalline thin film on the surface of an optical disk, which is a recording medium, is irradiated with laser light to change the crystalline thin film to an amorphous state, and the difference between the reflectivity of the crystalline state and the amorphous state laser light And a magneto-optical recording method that changes the direction of the magnetization of the magnetic thin film and detects the Kerr effect when irradiating a laser beam onto the magnetic thin film is known.

[0004] In an optical disk device based on such a recording principle, an optically detectable guide track is usually provided on a disk in order to record information at a high density, and tracking is performed using the guide track. Control is performed, and signals are recorded along this guide track.

[0005] As a conventional technique using such a guide track, for example, Japanese Patent Application Laid-Open No. 58-102347,
A technique described in JP-A-59-177744 is known.

[0006] In the prior art, the guide track is
Information specific to each track, for example, a track number is inserted, whereby a guide track at an arbitrary address is searched and information is recorded on the track, or information of a predetermined track recorded in advance is recorded. Can be reproduced.

[0007]

According to the above-mentioned prior art, track-specific information (hereinafter, referred to as "track information") necessary for retrieving a recording signal is described.
(Referred to as a track number) is usually formed of uneven pits on a disk substrate. When recording a video information signal, the uneven pits interfere with the video information signal and deteriorate the image quality. Has problems.

In addition, in a write-once CD (CD-WO), in order to eliminate these disturbances, the guide track is slightly vibrated (wobbled) to obtain an AT corresponding to the track number.
An IP (Absolute Time In Pre-groove) signal is formed on the disk substrate. However, this conventional technique has a problem that when the guide track is wobbled, the distance from the adjacent track changes, and when a video information signal is recorded, the image quality is degraded due to crosstalk.

An object of the present invention is to solve the above-mentioned problems of the prior art, prevent duplication of a video information signal and a track number, and do not degrade the quality of a video signal, an optical disc recording method, and an optical disc. It is to provide a device .

[0010]

According to the present invention, the object is to use a disk having guide tracks on which no track numbers are formed, and to record the track numbers simultaneously with the recording of the video information signal. It is achieved by doing.

[0011] The object is to use a disk having track numbers formed of uneven pits on the inner and outer circumferences of the area other than the area for recording the video information signal, and refer to this track number. This is achieved by controlling the recording position of the video information signal.

[0012]

In the area for recording the video information signal of the disc,
Since a track number composed of uneven pits is not recorded, it is possible to eliminate interference with the video information signal due to the uneven pits, and to record a video signal without deterioration. Also, since the track number is recorded simultaneously with the recording of the video information signal, subsequent information retrieval can be easily performed.

Further, by forming a track number composed of uneven pits in an area other than the area where the video information signal is recorded, for example, the inner circumference and the outer circumference of the disk, interference of the pit to the video information signal is prevented. Can be lost,
Moreover, since the recording start position or the recording end position of the disc can be ascertained, recording can be performed while accurately controlling the recording position of the video information signal. Further, since there is no wobbled guide track, it is possible to prevent crosstalk from occurring between tracks.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an optical disk, a recording method and an optical disk device according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view illustrating an optical disk according to a first embodiment of the present invention. In FIG. 1, 1 is the disk inner diameter, 2 is the disk outer diameter, 3 is the area where the guide track is formed, 4 is the unrecorded area, 5 is the area where video information is recorded, and 6 is the area where the track number is recorded.

The optical disk according to the first embodiment of the present invention shown in FIG. 1 has, for example, an Sb-Se film and a Bi film as a recording film.
A write-once type recording film using a two-layer structure with a film is used. In the guide track forming area 3 of the disc, guide tracks on which track numbers are not recorded in advance are formed.

Recording of video information on an unrecorded optical disk as described above is performed along or on a guide track formed in advance in the guide track formation area 3.
Recording is performed by irradiating a recording laser beam with a recording signal that is FM-modulated after adding a track number to video information.

As a result of this recording, as shown in FIG. 1, the video information is recorded in the area 5 where the video information is recorded, and the track number is recorded in the area 6 where the track number is recorded.

As described above, in the optical disk shown in FIG. 1, the track number and the video information signal are simultaneously recorded in the area 3 where the guide track is formed, so that an optical disk containing good video information can be obtained. .

In the area 6 where the above-mentioned track numbers are recorded, a lead-in signal is recorded on the inner periphery thereof, and a lead-out signal is recorded on the outer periphery thereof. Continuous track numbers are recorded in a program area therebetween. Is done.

FIGS. 2 and 3 are plan views illustrating an optical disc according to a second embodiment of the present invention. FIG. 2 shows a state before recording, and FIG. 3 shows a state after recording. FIG. 4 is an enlarged view showing a track number area, and FIG. 5 is a flowchart for explaining a recording method. 2 to 4, 7
Is an area in which a guide track is formed, 8 and 9 are areas in which track numbers composed of concave and convex pits are formed, 10 is an area in which track numbers are recorded, and 11 is an area in which video information is recorded.

The optical disk according to the second embodiment of the present invention shown in FIG. 2 has a guide track formed in advance in an area 7 where a guide track is formed, and an outer periphery other than an area for recording information such as a video information signal. In the track number area 9 and the inner track number area 8, the outer and inner track numbers of the concave and convex pits are formed in advance when the disk substrate is formed. Therefore, by reading the track number, the position of the disk can be detected.

By recording a video information signal or the like on an optical disk on which such a video signal is not recorded, FIG.
As shown in FIG. 5, an area 10 where a track number is recorded and an area 11 where video information is recorded are formed. Also in this case, since the track number and the video information signal are recorded on the guide track, the track number and the video information are associated with each track.

The track number area 8 of this optical disc,
In FIG. 4, which shows 9 and 10 in an enlarged manner, an area 10 where a track number is recorded is an area 1 where a lead-in signal is recorded.
2. Program area 1 in which continuous track numbers are recorded
3 and an area 14 in which a lead-out signal is recorded.

Next, an example of a method for recording information such as a video signal on the optical disk shown in FIG. 2 will be described with reference to a flow chart shown in FIG.

(1) First, the inner track number of the inner track number area 8 is detected, and recording is started from a position of a predetermined track number at which recording is to be started (step 2).
1, 22).

(2) Next, a lead-in signal is recorded, and after recording the lead-in signal on a predetermined track, program recording is performed. In the program recording, a video information signal with a continuous track number is recorded (step 23,
24).

(3) After the recording of the predetermined video information is completed, a lead-out signal is recorded, and when the outer track number in the outer track number area 9 is detected, the recording is immediately terminated.
When recording the lead-in signal and the lead-out signal, dummy video information is recorded at the same time. This is because the video information in this area is not reproduced by the reproduction player (steps 25 to 27).

According to such a recording method, the recording start position and the recording end position can be determined by the track numbers already formed on the optical disk, so that the recording position is accurately controlled to record information. be able to.

The reproduction by the reproduction player of the recorded optical disk shown in FIG. 3 on which the recording is performed by the above-described recording method is performed by detecting the above-described lead-in signal and then reproducing the video information recorded on the track in the program area. The reproduction is performed by detecting the readout signal and immediately stopping the reproduction operation.

In the optical disk according to the second embodiment of the present invention, since a track number composed of uneven pits is not formed in an area where reproducible image information is recorded, interference with image information due to uneven pits is prevented. Without
Good video information can be reproduced. It is preferable that there are no uneven pits in the area where the lead-in signal and the lead-out signal are recorded, but even if the lead-in signal and the lead-out signal area partially have uneven pits, video information can be reproduced. It is not a big obstacle in doing so.

FIG. 6 is a plan view for explaining an optical disk according to a third embodiment of the present invention. The reference numerals in FIG. 6 are the same as those in FIG.

In the optical disk according to the third embodiment of the present invention shown in FIG. 6, a recording track number section 10 to be recorded together with video information is made up of track number sections 8 and 9 previously recorded by pits having irregularities. In this way, the track numbers are not overlapped with each other, so that the track numbers are not overlapped with each other, so that the failure of the lead-in signal and the lead-out signal can be completely prevented.

FIG. 7 is a block diagram showing an embodiment of the optical disk apparatus according to the present invention. In FIG. 7, 31 is an optical disk, 32 is a spindle motor, 33 is a motor servo circuit, 34 is a focus and tracking control circuit,
35 is an optical head, 36 is a high-frequency signal preamplifier, 37 is a track number demodulation circuit, 38 is a recording drive controller, 39 is a laser drive circuit, 40 is a slider motor,
1 is a slider motor servo circuit, 50 is a video image reproducing device, 51 is a track address code generator, and 52 is FM.
The modulator 53 is a recording system controller.

The optical disk device shown in FIG. 7 is suitable for realizing the above-described recording method according to the present invention. The following description assumes that video information is recorded on an unrecorded optical disk as shown in FIG. The configuration of the device will be described.

The unrecorded optical disk 31 is rotated by a spindle motor 32 via a motor servo circuit 33, and the optical disk focus and tracking control circuit 3
4, the laser beam 42 from the optical head 35 is accurately irradiated along the guide track of the optical disk 31. A known push-pull method is used for this tracking control.

Then, the high-frequency signal preamplifier 36 and the track address demodulation circuit 37 detect the track address signal of the uneven pits provided on the optical disk 31. The recording drive controller 38 determines a recording position on the optical disk 31 based on the detected track address signal.

This determination can be made, for example, by using an address signal of 10000 or less for the inner track number area 8 and using an address signal of 20000 to 30000 for the outer track number area 9. .
That is, it is possible to discriminate between the inner and outer circumferences based on the detected address signal, and determine the position on the optical disc of the guide track area 7 for recording the track number and the video signal by not detecting the address signal. be able to.

The recording drive controller 38 controls recording while moving the optical head by the slider motor 41 via the slider motor servo circuit 41.

When recording video information, for example, digital V
A video information signal is supplied from a video image reproducing device 50 composed of a TR or the like, and a track address code generated by a track address code generator 51 is added to the video information signal. The FM modulator 52 FM-modulates the video information signal to which the track address code has been added, and sends it to the recording drive controller 38 as a recording signal. Controller 3
8 modulates the laser beam by the laser drive circuit 39 based on the recording signal, and performs recording on the optical disk 31.

The recording system controller 53 controls the video image reproducing device 50, the track address code generating device 51, and the recording drive controller 38.
That is, when the recording drive controller 38 determines the inner circumference recording position of the optical disk 31, the recording system controller 53 causes the video image reproduction device 50 to supply the video information signal and the track address code generation device 5
1 to generate a lead-in signal.

After recording the predetermined lead-in area, the recording system controller 53
The information video is recorded in the program area while controlling the track address code generating device 51 by the time code signal received from the device and generating the track number. When the program ends, the track address code generating device 51 is controlled by the time code signal. Under the control, a lead-out signal is generated to record the lead-in signal.

Finally, the recording system controller 53
, By recording drive controller 38 to determine the outer circumferential recording position of the optical disc 31, to end the recording operation, thereby completing the recorded optical disc.

The optical disk according to the embodiment of the present invention described above.
Although the apparatus does not mention the rotational speed of the optical disk 31, the present invention is applicable to a disk in a CAV (constant rotational speed) mode and a disk in a CLV (constant linear velocity) mode. can do. Furthermore, the present invention can be applied to both write-once optical disks and rewritable optical disks.

[0045]

As described above, according to the present invention, uneven pits or track numbers due to the ATIP signal are not recorded in the video information recording area. By reproducing a track number composed of uneven pits in areas other than the video information recording area, it is possible to accurately control the recording position of the disc.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an optical disc according to a first embodiment of the present invention.

FIG. 2 is a plan view illustrating a state before recording on an optical disc according to a second embodiment of the present invention.

FIG. 3 is a plan view illustrating a state after recording on an optical disc according to a second embodiment of the present invention.

FIG. 4 is an enlarged view showing a track number area.

FIG. 5 is a flowchart illustrating a recording method.

FIG. 6 is a plan view illustrating an optical disc according to a third embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of an optical disk device according to one embodiment of the present invention.

[Explanation of symbols]

 3, 7 Guide track area 4 Unrecorded area 5, 11 Image information recorded area 6, 10 Track number recorded area 8 Inner track number area 9 Outer track number area 12 Lead-in area 13 Program area 14 Lead-out area 31 Optical disk Reference Signs List 32 spindle motor 33 motor servo circuit 34 focus and tracking control circuit 35 optical head 36 high frequency signal preamplifier 37 track number demodulation circuit 38 recording drive controller 39 laser drive circuit 40 slider motor 41 slider motor servo circuit 50 video image reproducing device 51 track address code Generator 52 FM modulator 53 Recording system controller

Continued on the front page (72) Inventor Masaaki Kurebayashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Media Laboratory (72) Inventor Jin Yanagihara 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Inside the Video Media Research Laboratory (72) Inventor Katsuo Konishi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Video Media Research Laboratory Hitachi, Ltd. (72) Yoshihiko Noro 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Shares (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 7/24 561

Claims (5)

(57) [Claims] An optical disc capable of recording an information signal, comprising: an address signal on the optical disc and a guide track for recording the information signal;
Alternatively, an optical disk characterized in that uneven pits indicating an address signal are formed in inner and outer tracks. 2. An optical disk recording method capable of recording an information signal, wherein an address signal and an information signal are recorded along or on a guide track on which an address signal is not formed on the optical disk. A recording method for an optical disk. 3. A recording method for an optical disc having an uneven pit indicating an address signal on an optical disc and a guide track on which no address signal is formed, wherein: a position along the guide track or at a position on the guide track. And recording the address signal and the information signal at a position different from the position where the concave and convex pits are formed in the circumferential direction of the disk. 4. An optical disc device capable of recording an information signal, comprising: means for rotating an optical disc having a guide track on which no address signal is formed on the optical disc; and means for driving along or on the guide track. An optical disc device comprising: an optical head for recording address information and an information signal. 5. An optical disk device capable of recording an information signal, comprising: means for rotating an optical disk having irregular pits indicating an address signal on the optical disk, and a guide track on which no address signal is formed; An optical head that reads information from an optical disk and records an address signal and an information signal along or on the guide track, and detects an address signal due to the concave and convex pits from the information read by the optical head. An optical disc device comprising: a demodulation unit; and a controller unit that controls a recording position of an address signal and an information signal by the optical head based on the address signal detected by the demodulation unit.