JPH08279161A - Optical disk and reproducing method - Google Patents

Abstract

PURPOSE: To easily identify both sides of an optical disk with the presence of a label by providing a first read-in area on a first prescribed area of both recording surfaces and providing a second read-in area on a second prescribed area. CONSTITUTION: The optical disk is constituted so that the label is stuck on a label area of its one side surface. Then, both sides are easily judged by the presence of the label or visible information displayed on the label. In such a case, since recording surface information showing whether or not the second read-in area 5 exists on the same recording surfaces are recorded on respective first read-in areas 3a, 3b, a reproducing device reads the first read-in areas 3a, 3b and the second read-in area 5 in conformity with a simple category regardless of both sides of the recording surface of the optical disk to reproduce a program correctly.

Description

Detailed Description of the Invention

[0001]

[0001]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small optical disc in which visible information for the disc surface is displayed on a part of one side of the disc, and information is recorded using both sides of the disc, and a reproducing method thereof.

[0003]

[0002]

[0004]

2. Description of the Related Art Conventionally, a so-called compact disc (hereinafter referred to as a CD) is known as an optical disc for reproducing music. In a CD, pits that carry information bits are arranged in a spiral shape from the inner circumference to the outer circumference of the disc on one side of the disc. In a CD reproducing device, a light beam for reading the pits is relatively arranged in the rotation direction of the disc. The optical disk is scanned at a constant speed so that the optical disk is scanned at a constant linear velocity (CL
The information is optically read by controlling the rotation to V) and irradiating the pit with a beam. Considering that most of the existing music in CD is within 60 minutes and that you can enjoy a series of music without interruption, the music information is recorded on only one side, and the standard recording time is about 1 hour. It is said that. As a result, a single-sided recording disk having an outer diameter A of 120 mm is formed as shown in FIG. On the information recording surface side of the disc, a clamping area 101 for clamping the disc is provided in the vicinity of the center hole of the disc having an inner diameter B of 15 mm, and pits 102 are spirally arranged on the outer peripheral side thereof. 103 is provided. The information recording area has a lead-in area 10 at the innermost circumference.
4 further has a program area 105 in the outer peripheral portion.
However, the lead-out area 106 is formed on the outermost circumference.
Is provided. The lead-in area 104 shows the table of contents of the program of the disc, and the elapsed time in the lead-in area, the number of tracks (songs) in the program area 105, and its absolute address information (Table Of C).
Since contents (hereinafter referred to as TOC)) and the like are recorded, by reading this information prior to the start of the reproduction in the program area 105, it is possible to quickly find the beginning of the music when playing the music and to directly access the music when selecting the music. It can be carried out. Further, the program area 105 is an area for recording music information, and the music number, the elapsed time in the music, the elapsed time from the start of the disc reproduction, etc. are recorded together with the music information. Further, in the lead-out area 106, information indicating that the last song recorded on the disc is finished is recorded. The lead-in area 104, the program area 105, and the lead-out area 106 constitute the information recording area 103 of the disc. The pits that carry these recorded information are read by a light beam (illuminated from above in FIG. 8) emitted through a transparent plastic layer such as polyvinyl chloride or acrylic having excellent heat resistance and moisture resistance. is there.

On the other hand, the non-information recording surface side (the lower side in FIG. 8) of the CD is used as a label surface 107 on which predetermined visible information such as a disc name and a recorded music title is printed.

[0006]

FIG. 9 shows a block diagram of a CD reproducing apparatus.

In FIG. 9, the disk 201 is the above-mentioned C
D, in this case, it is assumed that the information recording surface is placed face down on the turntable of the spindle motor 202. The recorded information on the disk 201, which is rotated by the spindle motor 202, is read by the optical pickup 203. The pickup 203 includes a laser diode, an objective lens, a focus actuator, a tracking actuator, a photo detector, and the like. The output of the pickup 203 is supplied to the RF amplifier 204 and at the same time is supplied to the focus servo circuit 205 and the tracking servo circuit 206. The focus servo circuit and the tracking servo circuit drive and control the focus actuator and the tracking actuator in the pickup in response to a command from the system controller 212, and the laser light emitted from the laser diode in the pickup is on the recording surface of the disc 201. The information spot is converged to form an information detection spot, and the position of the light spot in the radial direction of the disc 201 is controlled so that the spot is located on the track formed on the recording surface of the disc 201. .

The coil current supplied to the coil for driving the tracking actuator in the pickup 203 is supplied to the slider servo circuit 207. In the slider servo circuit, a current detection signal corresponding to the supplied coil current is generated, subjected to signal processing such as amplification and phase compensation, and then output as a drive signal for the slider motor 208. The slider motor 208 drives the slider 209 which mounts the pickup 203 and is movable in the radial direction of the disk, and controls the tracking actuator in the pickup 203 to be located at the midpoint of the movable range.

On the other hand, the R output from the RF amplifier 204
The F signal is supplied to the decoder 213 and the PLL circuit 211. The PLL circuit 211 generates a clock signal phase-locked with a clock component included in the supplied RF signal,
It is supplied to the spindle servo circuit 210 and the decoder 213. The decoder 213 is a circuit block that decodes an RF signal that has been encoded suitable for recording, such as EFM, into an original digital signal, and includes data such as absolute time information and music information in the decoded digital signal. The auxiliary information is supplied to the system controller 212, and digital data including music information and the like is supplied to a signal processing unit (not shown).

The spindle servo circuit 210 controls the rotation of the disk to a desired rotation speed based on a clock signal phase-synchronized with the reproduction signal supplied from the PLL circuit and a reference clock signal supplied from the X'tal oscillator. To do.

The position detection switch 214 is arranged on the movement line of the pickup in the radial direction, and is closed when the irradiation position of the light beam on the disc enters the lead-in area as the pickup moves. It is configured to output a detection signal. The detection signal of this position detection switch is supplied to the system controller 212.

The system controller 212 is formed by a microcomputer including a processor, ROM, RAM and the like. To the system controller 212, data attached information from the decoder 213, a reproduction command signal from an operation key (not shown), a detection signal from a position detection switch, etc. are input. The processor processes a signal input according to a program stored in advance in the ROM,
The focus servo circuit 205, the tracking servo circuit 206, the slider servo circuit 207, the spindle servo circuit 210, and the like are controlled.

[0013]

With reference to FIG. 10, the process in which the CD is mounted in the reproducing apparatus and the reproduction start command is received until the reproduction of the first tune is started in the above-mentioned structure will be described.

FIG. 10 is an operation flowchart of the system controller 212 for controlling the operation of the reproducing apparatus from the reproduction start command of the CD to the reproduction start of the first music piece.

When the CD reproducing device receives the reproduction start command, the system controller moves the pickup of the reproducing device to the innermost circumference of the information recording area of the CD in step S101. Next, when it is detected that the pickup has moved to a position where the lead-in area can be read by pressing the lead-in area detection switch provided in the reproducing apparatus along with the movement of the pickup in step S102, S103
Then, the focus servo is turned on. Next, the process proceeds to step S104, the rotation of the spindle motor for mounting the CD is started, and the CD is accelerated to a predetermined rotation speed. Next, in step S105, the tracking servo is turned on. After the tracking servo is turned on, the process proceeds to step S106, and the spindle servo is turned on to control the spindle motor at a predetermined rotation speed. In this state, the pickup reads the TOC information in the lead-in area in step S107, and the system controller stores the read TOC information in the memory. Next, in step S108, the pickup is moved in the outer peripheral direction based on the TOC information read in step S107 to search for the absolute address of the first track (track 1).
Start playing the first song.

[0016]

As described above, the lead-in area of the conventional CD is the reference position for starting the reproduction of the CD, and the reproducing apparatus reads the TOC information recorded in the lead-in area and then performs the reproducing operation thereafter. Was there.

[0017]

[0006]

[0018]

On the other hand, in recent years, it has been attempted to record video information such as movies in a program area on a disc having the same diameter as the music reproducing disc. The video information including the audio information requires a huge amount of information recording capacity, and since the reproduction time is long, it cannot be recorded with the recording capacity of a single-sided disc. Therefore, it has been considered to secure a recording capacity by bonding a single-sided disk and using both sides as recording surfaces.

However, when both sides are used as recording surfaces, there is no area available for labels, which is inconvenient for the disc user to identify the front and back sides of the disc. For this reason, it is possible to record necessary information from the inner circumference of the disc and use the surplus area for the label area. If priority is given to securing the area, the display area becomes large over the entire circumference of the disc, and as a result, it becomes impossible to secure a sufficient recording area for recording information. When the label area is provided on the inner circumference side, for example, a lead-in area exists from the diameter of 46 mm toward the outer circumference and a center hole with an inner diameter of 15 mm exists in the center of the disc. Inside, it is not possible to secure a sufficient area for visual recognition as a label.

[0020]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide visible information for the disc surface on a part of the information recording area on one side of a small-sized optical disc on which information is recorded using both sides. The present invention provides a small-sized optical disc in which a label area sufficient for recording is provided and identification information for identifying the front and back of the disc is recorded, and a reproducing method thereof.

[0021]

[0008]

[0022]

According to the first aspect of the present invention,
A first lead-in area is provided in a first predetermined area on both recording surfaces, and a second lead-in area is provided in a second predetermined area located on the outer peripheral side of the first predetermined area on one of the recording surfaces. It is composed of an optical disc.

According to a second aspect of the present invention, the first lead-in area on one recording surface includes recording surface information indicating that it is a label surface. To be done.

According to a third aspect of the present invention, the first predetermined area and the second predetermined area have a predetermined length in the radial direction of the disk,
The optical disc according to claim 1, wherein the optical discs are arranged apart from each other.

According to a fourth aspect of the present invention, there is provided an optical disc according to the first aspect, wherein a program area is arranged on the outer peripheral side of the second predetermined area.

According to a fifth aspect of the present invention, the first lead-in area is provided in the first predetermined area of both recording surfaces, and
A method of reproducing recorded information recorded on an optical disc having a second lead-in area in a second predetermined area located on the outer peripheral side of a first predetermined area on one side of a recording surface, the method being in accordance with an information reproduction command. The pickup to transfer the pickup to the first predetermined area, the first step of picking up the first lead-in area in the first predetermined area, and the reading operation to the first lead-in area. And a second step of moving the pickup to the second predetermined area when it is detected that the recording surface information indicating the label surface is recorded.

[0027]

[0009]

[0028]

Since the present invention is configured as described above, it is preferable that
According to the invention described above, the second lead-in area is provided in the second predetermined area located on the outer peripheral side of the first predetermined area on one of the recording surfaces of the double-sided recording optical disk.
Since a label area can be provided between the predetermined area and the second predetermined area to display predetermined visible information such as the disc name and the title of the recorded movie, the front and back of the optical disc can be easily displayed depending on the presence or absence of the label. Can be visually identified.

According to the second aspect of the present invention, the first lead-in area of the recording surface provided with the label area is
Since the recording surface information indicating the label surface is included, the playback device can detect that the surface of the optical disc being read is the label surface, so that the pickup can accurately and quickly perform the next operation. Can be migrated.

According to the invention of claim 3, the first
Since the predetermined area and the second predetermined area are spaced apart by a predetermined length in the radial direction of the disc, it is possible to display predetermined visible information such as the disc name and the title of the recorded movie. Enough space can be secured.

According to the invention of claim 4, the second
Since the program area is arranged on the outer peripheral side of the predetermined area, a huge amount of information recording capacity can be secured on both sides of the optical disc.

According to the fifth aspect of the invention, the pickup is caused to read the first lead-in area in response to the information reproducing command, and the read operation causes the first lead-in area to be the label surface. When it is detected that the recording surface information shown is recorded, the pickup is moved to the second predetermined area. Therefore, if the surface of the optical disk being read is the label surface, the pickup continues to read the second read area. Since it is transferred to the in-area, it can be performed according to a simple category regardless of the front and back of the mounted disk, and the load on the system controller can be reduced.

[0033]

[0010]

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a main sectional view of an optical disc according to an embodiment of the present invention.

In the figure, both sides of the optical disk are information recording surfaces, and the outer diameter C of the disk and the inner diameter D of the center hole have the same size as the conventional CD. Further, a clamping area 1 for holding the optical disk by the reproducing apparatus is provided at the same position as the CD in the radial direction of the disk, and pits 2 are spirally arranged on the outer peripheral side thereof to record information. ing.

A first lead-in area 3a is provided in the same area as the CD lead-in area 104 in the radial direction of the disc on one side of the information recording surface of the disc. Further, a label area 4 having a region of a predetermined width in the disc radial direction is provided on the outer peripheral side thereof. A label is attached to the label area 4 by printing paper or synthetic resin paint, and predetermined visible information such as a disc name and a title of a recorded movie is displayed. In addition, the predetermined area adjacent to the outer periphery of the label area 4 has a second
The lead-in area 5 is provided. Further, a program area 6 is provided in a predetermined area adjacent to the outer periphery of the second lead-in area 5, and the pits are spirally formed continuously with the pits formed in the second lead-in area 5. It is arranged. Further, a lead-out area 7a is provided in a predetermined area adjacent to the outer periphery of the program area 6, and pits formed in the program area 6 are continuously arranged in a spiral shape.

On the other information recording surface side of the disc, a first lead-in area 3b is provided in the same area as the lead-in area 104 of the CD in the radial direction of the disc. Further, a program area 8 is provided in a predetermined area adjacent to the outer periphery of the first lead-in area 3b, and the pits are arranged in a spiral pattern continuously with the pits formed in the first lead-in area 3b. Has been done. Further, a lead-out area 7b is provided in a predetermined area adjacent to the outer periphery of the program area 8, and the pits are continuously arranged in a spiral shape so as to be continuous with the pits formed in the program area 8.

As described above, in the optical disc of the present invention, the pits are spirally arranged on the information recording surface from the inner circumference to the outer circumference of the disc. In the optical disc reproducing apparatus, the light beam for reading the pits is the disc. In the direction of rotation of the disk, while controlling the disk to rotate at a constant linear velocity (CLV) so as to scan at a relatively constant speed in the direction of the pits formed on the disk, the pits are optically irradiated with a light beam. Reading information. For this reason, when the recorded information is reproduced, the rotation speed of the optical disc decreases as the outer diameter of the disc increases, so that the information recording density due to the pit arrangement increases. Therefore, as described above, by providing the program area 6 adjacent to the outer circumference of the second lead-in area 5, a huge recording capacity of information can be secured.

[0039]

Here, on one of the information recording surfaces, the first lead-in area 3a indicates the table of contents of the program of the disc, and information for calculating the reproduction required time and elapsed time in the first lead-in area 3a and Since the information for detecting the presence / absence of the second lead-in area 5, the number of tracks in the program area 6 and the absolute address information (TOC) of the program area 6 are recorded, the reproducing apparatus starts reproduction of the program area 6. By reading these information in advance, it is possible to shift to the next predetermined operation. Further, in the program area 6, audio or video and information for identifying or controlling to reproduce them are recorded, and information is recorded so as to be identified and reproduced on one or a plurality of tracks. Further, in the lead-out area 7a, information indicating that the last track recorded in the program area 6 has ended is recorded.

Further, on the other information recording surface, the first lead-in area 3b indicates the table of contents of the program of the disc, and the information for calculating the reproduction required time and the elapsed time in the first lead-in area 3b and Since the number of tracks in the program area 8 and the absolute address information (TOC) thereof are recorded, the reproducing apparatus reads these pieces of information before starting the reproduction of the program area 8.
It is possible to shift to the next predetermined operation. In the program area 8, as in the case of the program area 6, audio or video and information for identifying or controlling to reproduce them are recorded, and the programs are divided so as to be identified and reproduced in one or a plurality of tracks. Has been done.
Further, in the lead-out area 7b, information indicating that the last track recorded in the program area 8 has been recorded is recorded.

[0041]

FIG. 2 shows a block diagram of a reproducing apparatus for reproducing the optical disc having the above-mentioned structure. 2 is different from FIG. 9 in that a position detection switch 16 is provided.

Similar to the position detection switch 214, the position detection switch 16 is on the movement line of the pickup in the radial direction of the disc, and the irradiation position of the light beam on the disc along with the movement of the pickup is the second lead-in area. When it exists in 3b, it is closed to generate a detection signal. This detection signal is supplied to the system controller.

[0043]

The process from the time when the optical disk of the present invention having the above-mentioned structure is mounted at the disk mounting position of the reproducing apparatus and the reproduction start command is received until the reproduction of the first program (track 1) is started will be described with reference to FIG. .

FIG. 3 is an operation flowchart of the system controller for controlling the operation of the reproducing apparatus from the reproduction start command of the optical disc to the reproduction start of the first program (track 1) in the present invention.

When the system controller receives the reproduction start command, the pickup is moved to the innermost circumference of the optical disk in step S1. Next, in step S2, the pickup is moved to a position where the first lead-in area can be read by pressing the first lead-in area detection switch provided in the reproducing apparatus along with the movement of the pickup. Is detected,
In step S3, the focus servo is turned on.
Next, in step S4, the spindle motor for mounting the optical disk is started to accelerate the optical disk to a predetermined rotation speed. Next, in step S5, the tracking servo is turned on. After the tracking servo is turned on, the process proceeds to step S6, and the spindle servo is turned on to control the spindle motor at a predetermined rotation speed. Next, in step S7, the pickup reads the information recorded in the first lead-in area, and the system controller stores the read information content in the memory. Here, since the information recorded in the first lead-in area includes information for detecting the presence or absence of the second lead-in area, the system controller determines in step S8 whether or not the second lead-in area is present. To detect. Here, when the pickup reads the information recorded in the first lead-in area on the side where the label area is not provided on both information recording surfaces of the optical disc, the system controller does not have the second lead-in area. Then, the process proceeds to step S9, the pickup is moved in the outer peripheral direction, the absolute address of the track 1 is searched, and the reproduction of the track 1 is started.

When the pickup reads the information recorded in the first lead-in area on the side where the label area is provided on both information recording surfaces of the optical disc, the system controller sets the second lead-in area. When it is determined that there is an error, the process proceeds to step S10. In step S10, the system controller focuses
The servos of the tracking and spindle are turned off to stop reading, and the process proceeds to step S11 to move the pickup to the second lead-in area. Next, in step S12, the second lead-in area detection switch provided in the reproducing apparatus is pressed along with the movement of the pickup to move the pickup to a position where the second lead-in area can be read. If detected, the process proceeds to step S13 and the focus servo is turned on again. When the focus servo is turned on, the process proceeds to step S14, the spindle motor is restarted, and the optical disc is accelerated to a predetermined rotation speed. Next, in step S15, the tracking servo is turned on again. After the tracking servo is turned on, the process proceeds to step S16, and the spindle servo is turned on to control the spindle motor at a predetermined rotation speed. Next, in step S17, the pickup reads the information recorded in the second lead-in area, and the system controller stores the information content in the memory. Next, in step S18, the pickup is moved in the outer peripheral direction to search the absolute address of track 1 and start reproduction of track 1.

[0047]

As described above, since the optical disc in FIG. 1 is constructed such that a label is attached to the label area 4 on one side thereof, the front and back of the disc can be easily determined by the presence or absence of the label or the visible information displayed on the label. Can be judged. The first lead-in area 3
a and 3b are respectively arranged on the same radius on both sides of the disk, and the first lead-in areas 3a and 3b respectively indicate whether or not there is a second lead-in area 5 on the same recording surface. Since the information is recorded, the reproducing apparatus uses the first lead-in areas 3a and 3b and the second lead-in area according to a simple category regardless of whether the recording surface of the optical disk mounted on the reproducing apparatus is front or back. 5 can be read and the program can be reproduced accurately.
Further, since the label area 4 is provided with a predetermined length in the radial direction, predetermined visible information such as a disc name and a recorded movie is sufficiently displayed on the label and can be easily read. On the side of the information recording surface having the label area 4 of the disc, the label area 4 is provided on the inner side of the disc and the program area 6 is provided on the outer side of the disc, so that the information recording density in the program area 6 becomes large. It is possible to secure a recording capacity for a huge amount of information.

[0048]

Another embodiment of the present invention will be described below with reference to FIG. 4. The same parts as those of the embodiment of the present invention described above with reference to FIG. 1 are designated by the same reference numerals. There is.

FIG. 4 is a principal plan view of the labeled information recording surface side of an optical disc according to another embodiment of the present invention. In the figure, the outer diameter C of the disc and the inner diameter D of the center hole have the same size as the conventional CD. Further, 3a is a first lead-in area, 5 is a second lead-in area, 6 is a program area, and 7a is a lead-out area, which are provided in the same area as shown in FIG. 1 in the radial direction of the disc. Has been. Reference numeral 9 is a bridge track, which is composed of an array of pits in which predetermined information is recorded, and each pit row formed in a spiral shape in the first lead-in area 3a and the second lead-in area 5 is information. It is provided so as to be continuously connected and arranged on the recording surface. Therefore, the pits arranged in the first lead-in area 3a and the second lead-in area 5, the bridge track 9, the program area 6, and the lead-out area 7a are 1 from the inner circumference to the outer circumference on the information recording surface of the disc. Make up a spiral track of a book. On the information recording surface of the disc, guide tracks (not shown), which will be described later, are formed on both sides of the bridge track 9 on the both sides of the bridge track 9 and are arranged in a plurality of pits substantially parallel to the bridge track 9. It is provided. Again 1
0 is a label area, which is the first lead-in area 3a
And a second lead-in area 5 and includes a predetermined area other than the area where the bridge track 9 and the guide track are recorded. Label area 1
A label is affixed to 0 by printing paper or synthetic resin paint, and predetermined visible information such as the disc name and the title of the recorded movie can be displayed. Although not shown, the back side of the optical disc has the same configuration as the recording face of the information recording face of the optical disc in FIG. 1 which does not have the label area 4.

[0050]

FIG. 5 is an enlarged view of portion E in FIG.
In FIG. 5, reference numeral 11 denotes an array of pits formed in a spiral shape in the first lead-in area 3a, and the pits of the bridge track 9 and the connection points 12 (black points) are arranged continuously. Are connected as. Reference numeral 13 is a guide track, which is composed of a plurality of tracks provided on both sides of the bridge track 9 substantially in parallel at a predetermined interval.

[0051]

FIG. 6 is an enlarged view of portion F in FIG. In FIG. 6, reference numeral 15 denotes an array of pits formed in a spiral shape in the second lead-in area 5, and the guide track 13 gathers together with the bridge track 9 at the end to form one track. 14 (black dots) are connected so as to be continuous with the pit array 15.

[0052]

Next, the process from when the optical disc in FIG. 4 is mounted at the disc mounting position of the reproducing device and the reproduction start command is received until the reproduction of the first program (track 1) is started will be described with reference to FIG.

FIG. 7 is a flowchart of the system controller for controlling the reproducing operation of the reproducing apparatus from the reproduction start command of the optical disk in FIG. 4 to the reproduction start of the first program (track 1). Since steps S1 to S7 in the flowchart of FIG. 7 are the same steps as steps S1 to S7 in the flowchart of FIG. 3 described above, step S1 is used here.
The steps after 7 will be described.

The pickup of the optical disk reproducing apparatus is
In step S7 in FIG. 7, the information recorded in the first lead-in area of the optical disc is read, and the microcomputer of the reproducing device stores the information content. Here, since the information recorded in the first lead-in area includes information for detecting the presence or absence of the second lead-in area,
The reproducing apparatus detects the presence or absence of the second lead-in area in step S19. Here, when the pickup reads the information recorded in the first lead-in area on the side where the label area is not provided on both information recording surfaces of the optical disc (when there is no second lead-in area), the system The controller determines that there is no second lead-in area, moves to step S20, moves the pickup in the outer peripheral direction, searches the absolute address of track 1, and starts reproduction of track 1. When the pickup reads the information recorded in the first lead-in area on the side where the label area is provided on both information recording surfaces of the optical disc, the system controller has the second lead-in area. When the pickup is jumped to the final track where the pits in the first lead-in area are recorded, the final track is traced.

Here, on the side where the label area is provided on both information recording surfaces of the optical disc, the bridge track 9 is continuously connected to the array 11 of pits recorded in the first lead-in area, Furthermore, since the array 15 of pits recorded in the second lead-in area 5 is continuously connected to the end of the bridge track 9, the pickup traces the last track of the first lead-in area. It will be guided to the second lead-in area via the bridge track 9.

Next, when it is detected in step S22 that the pickup has moved to the second lead-in area by the second lead-in area detection switch provided in the reproducing apparatus, the process proceeds to step S23 and the second lead-in area is detected. The information recorded in the area is read, and the system controller stores the information content in the memory. Next, in step S20, the pickup is moved in the outer peripheral direction to search the absolute address of the track 1, and the reproduction of the track 1 is started.

[0057]

As described above, the optical disk in FIG. 4 has the label area 10 on the information recording surface side,
The arrangement of the pits recorded in the first lead-in area 3a and the second lead-in area 5 is the bridge track 9
The playback device can move the pickup to the second lead-in area 5 without turning off the focus servo, tracking servo, and spindle servo. Can be played quickly.

[0058]

Although the embodiment of the present invention shows an example in which tracks are not formed in the area of the label area 4 by a pit arrangement or the like, the area of the label area 4 is continuous with the first lead-in area 3a. Alternatively, a track may be formed by a pit arrangement or the like, and this track may be configured to be continuous with the track formed in the second lead-in area 5. The information recorded in the first lead-in area 3a may be the same as the information recorded in the second lead-in area 5.

[0059]

[0021]

[0060]

Since the present invention is constructed as described above,
According to the first aspect of the present invention, the second lead-in area is provided in the second predetermined area located on the outer peripheral side of the first predetermined area on one of the recording surfaces of the double-sided recording optical disk. A label area can be provided between the area and the second predetermined area to display predetermined visual information such as the disc name and the title of the recorded movie. Can be identified.

According to the invention of claim 2, the first lead-in area of the recording surface provided with the label area is
Since the recording surface information indicating the label surface is included, the playback device can detect that the surface of the optical disc being read is the label surface, so that the pickup can accurately and quickly perform the next operation. You can do it later.

According to the invention of claim 3, the first
Since the predetermined area and the second predetermined area are spaced apart by a predetermined length in the radial direction of the disc, it is possible to display predetermined visible information such as the disc name and the title of the recorded movie. Enough space can be secured.

According to the invention of claim 4, the second aspect is provided.
Since the program area is arranged on the outer peripheral side of the predetermined area, a huge amount of information recording capacity can be secured on both sides of the optical disc.

According to the fifth aspect of the invention, the pickup is caused to read the first lead-in area in response to the information reproducing command, and the read operation causes the first lead-in area to be the label surface. When it is detected that the recording surface information shown is recorded, the pickup is moved to the second predetermined area. Therefore, if the surface of the optical disk being read is the label surface, the pickup continues to read the second read area. Since the disc is transferred to the in-area, the read operation can be performed according to a simple category regardless of the front and back of the mounted disc, and the load on the system controller can be reduced.

[Brief description of drawings]

FIG. 1 is a main cross-sectional view of an optical disc according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of an optical disk reproducing apparatus according to the present invention.

FIG. 3 is a flowchart of the operation of the optical disc reproducing apparatus according to the present invention.

FIG. 4 is a principal plan view of a labeled information recording surface side of an optical disc according to another embodiment of the present invention.

5 is an enlarged view of an E portion in FIG.

FIG. 6 is an enlarged view of an F portion in FIG.

FIG. 7 is a flowchart of the operation of the optical disc reproducing apparatus in FIG.

FIG. 8 is a main sectional view of a conventional compact disc.

FIG. 9 is a block diagram of a conventional compact disc reproducing apparatus.

FIG. 10 is a flowchart of the operation of a conventional compact disc reproducing apparatus.

[Explanation of symbols]

 1 ... Clamping area 2 ... Pit 3a ... First lead-in area 3b ... First lead-in area 4 ...・ ・ ・ ・ Label area 5 ・ ・ ・ ・ ・ ・ ・ ・ Second lead-in area 6 ・ ・ ・ ・ ・ ・ ・ Program area 7a ・ ・ ・ ・ ・ ・ Lead-out area 7b ・ ・ ・ ・ ・ ・ Lead-out area 8 ... Program area 9 ... Bridge track 10 ... Label area 11 ... Pit arrangement 12 ... Connection point 13 ...・ ・ ・ ・ ・ Guide track 14 ・ ・ ・ ・ ・ Connection points 15 ・ ・ ・ ・ ・ Pit arrangement 16 ・ ・ ・ ・ Position detection switch 101 ・ ・ ・ ・ ・ Clamping area 102 ・ ・ ・・ Pit 103 ・ ・ ・ Information recording area 104 ・ ・ ・ ・Lead-in area 105-Program area 106-Lead-out area 107-Label surface 201-Disk 202-Spindle motor 203-Pickup 204: RF amplifier 205: Focus servo circuit 206: Tracking servo circuit 207: Slider servo circuit 208: Slider motor 209: Slider 210-Spindle servo circuit 211-PLL circuit 212-System controller 213-Decoder 214-Position detection switch

Claims (5)

[Claims] 1. A first lead-in area is provided in a first predetermined area of both recording surfaces, and a first predetermined area is provided in a second predetermined area located on the outer peripheral side of the first predetermined area on one of the recording surfaces. An optical disc having a second lead-in area. 2. The optical disc according to claim 1, wherein the first lead-in area on the one recording surface includes recording surface information indicating a label surface. 3. The optical disk according to claim 1, wherein the first predetermined area and the second predetermined area are arranged so as to be separated by a predetermined length in a radial direction of the disk. 4. The optical disc according to claim 1, further comprising a program area on the outer peripheral side of the second predetermined area. 5. A first lead-in area is provided in a first predetermined area of both recording surfaces, and a first predetermined area is provided in a second predetermined area located on the outer peripheral side of the first predetermined area on one of the recording surfaces. A method of reproducing recorded information recorded on an optical disc having a second lead-in area, comprising: transferring a pickup to the first predetermined area in response to an information reproduction command; A first step of reading the recorded information of the first lead-in area in a predetermined area of the recording medium, and recording surface information indicating a label surface is recorded in the first lead-in area by the reading operation. A second step of moving the pickup to the second predetermined area when it is detected that the recorded information is reproduced.