JPH02101678A - Optical disk - Google Patents

Abstract

PURPOSE:To realize fast access and still reproduction as keeping interchangeability with a conventional disk by performing recording with constant linear velocity and angular velocity in first and second areas provided between read-in and read-out areas, respectively. CONSTITUTION:The read-in area 2, a first data area 3, a separation area 4, a second data area 5, and the read-out area are provided sequentially in an optical disk 1. The same signal as that of a conventional CD is recorded on the areas 2-4 with the constant linear velocity, and the signal is recorded on the areas 5 and 6 similarly with the constant angular velocity. TOC, as the arranging information of the data area of the CD and a code representing the existence of the second data area are recorded on the channel Q of the area 2 as retrieval information. Therefore, a player manufactured by assuming such disk interprets the code, and can perform the reproduction of the area 5. Meanwhile, since the area 4 is recorded as the read-out area, a conventional player can perform the reproduction of only the area 3. Since the constant angular velocity is kept at the area 2, search can be performed accurately, and the fast access can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical disc that is continuously recorded or reproduced on a 7-layer disc.

BACKGROUND OF THE INVENTION In recent years, optical discs for recording video and music, such as compact discs and laser discs, have become increasingly popular, and as the quality has improved, demands for more advanced usage have been increasing.

The first conventional example of the above-mentioned optical disc will be described below with reference to the drawings. FIG. 2 is a sectional view of a conventional compact disc.

In Fig. 2, 11 is a cross section of a compact disc, and 12 is a cross section of a compact disc.
1 is a lead-in area, 13 is a data area in which music signals are recorded, and 14 is a lead-out area indicating the end of the disc.

The operation of the compact disc configured as described above will be explained below.

On a compact disc, signals are recorded spirally from the inner circumference to the outer circumference at a constant linear velocity. This linear velocity has 1
．． A range exists from 2 m/sec to 1.4 m/sec. Compact discs have two types of channels, a main channel and a subcode channel, and are time-division multiplexed and recorded. The main channel has 44.11 kHz, 1
Two channels of audio data quantized to 6 bits are recorded together with error detection and correction codes. On the other hand, the subcode channel is further divided into eight channels from P channel to W channel. In the P channel, a flag indicating the interval between songs is recorded, and in the Q channel, search information for searching within the disc is recorded. The Q channel of the data area 13 contains search information that includes the beginning of the data area as 0 minutes, 0 seconds, and 0 frames on the outer periphery (accordingly increasing absolute +1', 'j', and the beginning of a masterpiece as 0 minutes, 0 frames).
Two types of information are recorded: relative time in seconds and O frames. A frame is a unit of 11.9 seconds, and 75 frames correspond to 1 second. In the Q channel of the lead-in area 12, arrangement information of the data area 13 is recorded as search information. This location information is TOC (Table of
The absolute time at the beginning of a famous piece of music recorded in the main channel in the data area 13 is recorded. Using this search information, a compact disc player (hereinafter abbreviated as CD player) can access any location within the compact disc. This access procedure will be explained below using the case of starting a song as an example. First, the CD player first reproduces the lead-in area to obtain TOC information and stores it in its internal memory. As mentioned above, the TOC records the correspondence between song numbers and absolute times. For example, when the third song is to be played, the CD player refers to the TOC stored in memory to know the absolute time of the start of 3 +ll+ [l. To access the target position using this absolute time, a two-stage t(y) search is generally performed.The first stage is to convert this absolute time into position information, move the optical pickup, and perform a rough search. In the second stage 1 (j~, the target position is detected by performing a track kick operation while reading the absolute time. In other words, after performing a rough search mechanically, a detailed search is performed while monitoring the absolute time. conduct.

FIG. 3 shows a second conventional example, in which a second data area 25 and an end position of the second data area are used to record digital data such as still images in addition to music data recorded on a compact disc. A second lead-out area 26 is provided for indicating.

In this example, a code indicating the existence of the second data area is recorded in the sub-food lot channel of the lead-in area 22. Therefore, a player made with this disc in mind can interpret this code and reproduce the second data area 25. However, traditional players
When the lead-out area 24 is detected, the reproduction ends, so the second data area 25 is not reproduced. Since time information is also recorded in the subcode rotary channel in the second data area, it is possible to access any position in the second area as well (for example, Japanese Patent Laid-Open No. 60-119671).

Problems to be Solved by the Invention However, in all of the configurations described above, recording is performed at a constant linear velocity in order to increase the recording density and lengthen the recording/reproducing time of 11.5 degrees. For this reason, we were faced with the following issues.

1) Access takes time due to the following reason 110.

The amount of movement cannot be calculated accurately to move the optical pickup to the target position. For example, the recording linear velocity of a compact disc is set between 1.2 m/sec and 1.4 m/sec, and absolute time does not directly correspond to physical position depending on the disc. The same can be said for laser discs with constant linear velocity. For this reason, a rough search involving movement of the optical pickup is often performed multiple times.

Even when performing a detailed search using track kicking, recording is performed at a constant linear velocity, so the change in time per track (2) differs greatly between the inner and outer circumferences, making it impossible to calculate the exact number of tracks.

Also, since the rotation speed varies depending on the location, it takes time to adjust the rotation speed accurately.

2) If video signals are recorded on a disk such as a laser disk at a constant linear velocity, still playback is impossible because the vertical synchronization signals are not aligned in the radial direction. To perform still playback, an image memory such as a field memory is required.

In view of the above problems, the present invention provides an optical disc that realizes high-speed access and still playback while maintaining compatibility with conventional discs in which recording is performed at a constant linear velocity.

Means for Solving the Problems In order to solve the above problems, an optical disc of the present invention has a lead-in area, a first data area, a separation area, a second data area, and a lead-out area, and has a lead-in area, a first data area, a separation area, a second data area and a lead-out area. The data area has a constant linear velocity, and part or all of the second data area records signals in a spiral shape at a constant angular velocity.

Effect of the Invention The present invention achieves an optical disc that records at a constant linear velocity and is capable of high-speed access and still playback while maintaining compatibility with conventional discs.

EXAMPLE Hereinafter, an optical disc according to a first example of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the configuration of an optical disc in an embodiment of the present invention, where 1 is an optical disc, 2 is a lead-in area, 3 is a first data area, 4 is a separation area, and 5 is a second data area. , 6 is a lead-out area.

The operation of the optical disc configured as described above will be explained below with reference to FIG.

The optical disc of this embodiment uses an optical disc having the same shape as a compact disc, and the lead-in area 2, first data area 3, and separation area 4 have a constant linear velocity and record the same signals as the compact disc. Also, the same signals as those on the compact disc are recorded in the second data area 5 and lead-out area 6, but at a constant angular velocity.

In the Q channel of the lead-in area 2, a TOC which is the arrangement information of the data area 13 and a code indicating the existence of the second data area are recorded as search information. Therefore, a player made with this disc in mind can interpret this code and reproduce the second data area 5. On the other hand, since the separation area 4 is recorded as a lead-out area, conventional players can only reproduce the first data area. The number of recording revolutions in the second data area 5 and the lead-out area is equal to the number of recording revolutions at the end of the separation area 4. That is, recording is performed at a constant linear velocity from the lead-in area 2 to the separation area 4, and by fixing the number of rotations at the start of recording in the second data area 5, recording is performed at a constant angular velocity.

As described above, according to this embodiment, by recording the second data area at a constant angular velocity, the absolute time directly corresponds to the physical position. Therefore, in the second region, the movement (1) of the optical pickup to the target position can be accurately calculated, and a rough search involving movement of the optical pickup can be performed accurately, resulting in faster access. Also,
Linear speed - even when performing a detailed search for track kicking.
Since the data is recorded at a constant rate, the amount of change in time per track is constant, and the number of tracks can be calculated accurately, leading to faster access.

In the above embodiment, the Q channel of lead-in area 2 has a second
A code indicating the existence of the second data area is recorded, and the CD player interprets this code and plays the second data area, but the code is not recorded and the CD player searches the outer circumference of the disc. Then, the second data area may be detected.

In addition, in the above embodiment, all separated areas 4 record at a constant linear velocity, and the rotational speed of the second data area is set equal to the recording rotational speed at the end of area 4. A number of transition regions may be provided so that the angular velocity of the second data region is equal on all disks.

Next, as a second embodiment of the present invention, an embodiment in which the present invention is applied to a laser disc will be described with reference to FIG.

The configuration of each area within the disk is the same as in the first embodiment. The optical disc of this embodiment uses an optical disc having the same shape as a laser disc, and the lead-in area 2, first data area 3, and separation area 4 have a constant linear velocity and record the same signals as the laser disc. . Also, the same signals as those on the laser disc are recorded in the second data area 5 and the read array i/area 6, but at a constant angular velocity.

Since the separate area 4 is recorded as a lead-out area, a conventional player can reproduce only the first data area. The second data area 5, the lead-out area, is recorded at an angular velocity at which 2n (n=1.2, --) field video signals are arranged in one rotation. For example, when recording an NTSC video signal with n=2, approximately 900 r I
) is recorded in m.

If the rotational speeds of the separation area 4 and the second data area 5 are different, a region for changing the rotational speed is provided within the separation area 4.

As described above, according to this embodiment, by recording the second data area at a constant angular velocity, it is possible to speed up access within the second data area. 2o([1:
1.2,・◆) Field memo g +! by recording the field video signal. Still playback is now possible in KL.

In both the first and second embodiments described above, the entire second data area was recorded at a constant angular velocity; however, in the second data area, areas that require high-speed access or still playback are It is also possible to record only the area with a constant angular velocity.

Next, as a third embodiment of the present invention, CDV (Con
pac t di s c v i d e
o) An example in which the present invention is applied to a disk will be described.

The configuration of each area within the disk is the same as in the first embodiment. The optical disc of this embodiment uses an optical disc with the same shape as a CDV disc, and the lead-in area 2 and first data area 3 record signals similar to those of the CDV disc, that is, signals similar to those of the compact disc. . Separation area 4 is further divided into a lead-out audio area and a lead-in video area. Since the lead-out audio area is recorded in the same way as the lead-out area of a compact disc, a CD player can play only the first data area. Also, the lead-in video area has a pause similar to the lead-in area of a laser disc. At the boundary between the lead-out audio area and the lead-in video area, a transition area is provided because the rotational speed changes greatly. The second data area starts at 78mm diameter and goes up to 116mm diameter.
mn] can be provided. In the NTSC system, if the second data area 5 is recorded at a linear velocity of 11 m/s, for example, the recording speed will be approximately 1800 rI at a diameter of 118 mm.
)m. The rotational speed of this portion is set to 1800 rpm, and a video signal is recorded at a constant angular velocity. In this case, since the change in rotational speed is very small, the area for the rotational speed transition may be very small.

As described above, according to this embodiment, by recording part of the second data area at a constant angular velocity, still playback on a CD V disc is realized without using a field memory.

When the present invention is applied to an optical disc on which video signals can be recorded, such as a laser disc or a CI/V disc, by recording the same video in consecutive 2n fields, it is possible to produce still images without blur when performing still playback. can be played.

-J In all of the three embodiments in which the two were connected, some kind of signal was recorded in all of the separated regions, but it is also possible to provide a no-signal region in a part of the separated regions.

Effects of the Invention As shown in FIG. a part recorded at a constant angular velocity by recording a signal in a spiral manner at a constant linear velocity in the first data area and a part or whole of the second data area at a constant angular velocity; Absolutely 11 in
．． The space between 7 and 7 directly corresponds to the physical location. Therefore, the second
In this region, the amount of movement of the optical pickup to the target position can be calculated accurately, and a rough search involving movement of the optical pickup can be performed accurately, resulting in faster access. Also, even when performing a detailed search using a track kick, the track speed is recorded at a constant linear velocity.
Since the change in time per book is constant, the number of tracks can be calculated accurately, leading to faster access.

This is particularly effective in cases where high-speed access is required, such as in CI-ROM (compact disk read-only-6 memory) which records structured digital data instead of digital audio signals. In this case the first
By recording digital audio in the first data area and recording digital data in the CD-ROM format in the second area, the second data area can be accessed while maintaining compatibility with conventional compact discs. This has the effect of increasing speed.

In addition, in discs that record video signals such as laser discs and CDV discs, the video signal of 2n (n = 1.2, -.) fields is recorded in one rotation in the area recorded at a constant angular velocity. In addition to this effect, it also has the effect of allowing still playback while maintaining compatibility with conventional discs.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an optical disc according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of a conventional compact disc. 1.21... Optical disc, 2, 12, 22... Lead-in area, 3.23...
1st data area, 4... Separation area, 5.25... Second data area, 6, 14... Lead-out area, 11... Compact disc, 13... Data area, 24 ...First lead-out area, 26... Second lead-out area. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (3)

[Claims] (1) It has a lead-in area, a first data area, a separation area, a second data area, and a lead-out area in order, wherein the first data area has a constant linear velocity and at least one of the second data areas An optical disc in which a portion of the disc records signals in a spiral manner at a constant angular velocity. (2) The optical disc according to claim 1, wherein in the area recorded at a constant angular velocity, 2n (n=1, 2, . . . ) field video signals are recorded in one rotation. (3) The optical disc according to claim 2, wherein the same video signal is recorded in consecutive 2n fields.