JPH03214428A - Disk type recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform recording and reproduction using plural channels satisfactorily by providing one address for a pair of tracks used simultaneously. CONSTITUTION:An optical head device is moved in the radius direction of an optical disk, and the optical disk is irradiated with laser beams 5a, 5b, then, the recording and reproduction is performed. At this time, a part on which oblique line is attached is provided in double spiral shape so as to keep a prescribed gap between two guide grooves with the guide grooves detectable with the beams 5a, 5b, and the recording and reproduction of two channels are performed. The guide groove on one side is formed as a DC group, and an address group is formed at the guide groove on the other side. Thereby, the tracks A, B can be formed between the DC groups, and the address group is formed between the tracks A and B. Thereby, tracking utilizing address information can be performed, and the recording and reproduction using the plural channels on a sheet of disk can be performed satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION C. Industrial Application Field The present invention relates to a disk-type recording/reproducing device that is applied to wideband signals such as HDTV.

[Summary of the invention]

The present invention relates to a disk-type recording and reproducing device, and when recording and reproducing using a plurality of tracks at the same time, by providing one address information for one set of the plurality of tracks, it is possible to This allows for better control, etc.

[Prior Art] A device for recording and reproducing color video signals, etc. using a rotating disk type recording medium (optical disk) has been proposed (
(See Japanese Patent Application Laid-Open No. 63-257395, etc.).

[Problem to be solved by the invention]

In such a disk-type recording and reproducing device, it is being considered to record and reproduce high-definition television (IIDTV) signals. In this case, IIOTV
Since the signal becomes broadband, conventional recording and reproducing using only one system (channel) requires increasing the relative speed between the disk and the laser beam, which requires higher laser output and higher speed tracking and focusing servos. There are many obstacles to practical application, such as improvements in technology and precision.

On the other hand, it is conceivable to perform recording and reproduction using a plurality of systems (channels). According to this, the signal for each channel can be a narrow signal, making it possible to record and reproduce at the same relative speed as before. However, conventionally, no device suitable for recording and reproducing information using a plurality of channels on a single disk has been proposed.

This application was made in view of these points, and is intended to enable good recording and reproduction using a plurality of channels on a single disc.

[Means to solve the problem]

The present invention provides a rotating disk type recording medium (optical disk (l
)), and when recording and reproducing multi-channel signals (optical head device (3)) by simultaneously using a plurality of tracks on this recording medium, the plurality of tracks used simultaneously during the recording and reproduction. One address information is provided for one set of tracks (address detection circuit (
13)) This is a disc-type recording and reproducing device characterized by the following.

[Operation] According to this, the lI of multiple trunks used simultaneously
Since one address information is provided for J1, this address information can be used to easily achieve proper tracking, and there is no risk of this address information causing crosstalk to another group. Control, etc. during recording and reproduction can be performed satisfactorily.

〔Example〕

FIG. 1 shows a case where two tracks are used simultaneously to record and reproduce signals of two channels. In this diagram,
(1) is a rotating disk type recording medium, for example, a write-once optical disk, and this optical disk (1) is driven by a spindle motor (2) at a constant angular velocity (CAV) of, for example, 1800 rpm or a constant linear velocity corresponding thereto. (CLV
) is rotationally driven.

Further, (3) is an optical head device, and this head device (3) is moved in the radial direction of the optical disk (1) by a sled motor (4). The second laser beams (5a) (5b) are irradiated onto the optical disc (1) to record and reproduce two-channel signals.

In this case, a preformat as shown in FIG. 2, for example, is provided on the optical disc (1). In other words, the shaded areas in this figure are guide grooves (groups) that have been provided in advance so that they can be detected by the laser beam, and when performing two-channel recording and playback, two guide grooves are required. They are provided in a double spiral shape with a predetermined spacing from each other. In the figure, only a part of the disk (1) is shown enlarged for the sake of explanation, and in this case, the guide grooves are continuous in a spiral pattern, alternating every other guide groove.

Therefore, two recording tracks are formed in a double spiral shape between these guide grooves. Further, one of the guide grooves is formed into a continuous DC group, and the other guide groove is interrupted in a predetermined pattern, and each of the interruptions forms arbitrary address information to form an address group.

As a result, the guide groove has DC groups and address groups alternately formed as shown in the figure, and these D groups.
Two recording tracks A and B are formed between group C, and an address group is formed between these recording tracks A and B.

And an optical disc (1) with guide grooves formed in this way
is irradiated with laser beams (5a) and (5b) from the optical head device (3). That is, the laser beams (5a) and (5b) are emitted from a laser diode (6) that independently generates two laser beams, which will be described later. The light beams are divided into three beams, and a total of six light beams are irradiated onto the optical disk (1) through an objective lens provided in a two-axis device (7).

Furthermore, from among these light beams, for example, A-D shown in the figure
The reflected light of the light beam is detected by a photosensor (8) provided with sensor sections A to D divided into two or four sections, respectively. Of the light beams shown, B and D are 0th order beams, A,
C is ±1st order light generated on the side preceding this 0th order light during recording and reproduction.

The signals detected by the sensor parts A to D of the photosensor (8) are respectively supplied to the focus servo circuit (10) through the focus detection circuit (9), and the servo signals formed here are sent to the two-axis dehysterizer (7). Forcing servo of the laser beams (5a) and (5b) is performed. In addition, the signals detected by the sensor parts Δ to D of the foot sensor (8) are respectively detected by the tire knocking detection circuit (11).
) is supplied to the trunking servo circuit (l2), and the servo signal formed here is supplied to the two-axis dehyss (7) to carry out trunking servo of the laser beams (5a) and (5b). These force-singing servos and trunking servos are disclosed in, for example, Japanese Patent Application Laid-Open No. 61-9
The technique disclosed in Japanese Patent No. 4246 is used.

Therefore, tracking servo or the like is performed such that, for example, the above-mentioned light beams A and C are irradiated onto the guide groove (group), and B and D are irradiated onto the recording trunk between them.

Further, for example, a signal detected by the sensor section C of the photosensor (8) that detects the reflected light of the light beam C is supplied to the address detection circuit (13), and the presence or absence of this detection signal is determined by the discrimination circuit (14). track jump command circuit (l5) when no address is detected for a predetermined time or longer.
), the irradiation position of the laser beams (5a) (5b) is determined by the two-axis dehyss (7)! Control is performed to shift by a track.

As a result, as shown in the figure, tracking servo and the like are performed so that the light beam C is irradiated onto the address group, the light beam A is irradiated onto the DC group, and the light beams B and D are irradiated onto the recording track AB, respectively.

Note that (100) indicates the servo system. Further, the address detected by the address detection circuit (13) is supplied to the control CPU (16), compared with any desired address, and the sled motor (4) is moved to the track of the desired address. ) are controlled. Also, in this control CPU (16), C
It is possible to control the rotation of the spindle motor (2) at the time of L■, and to control the operations of a recording system (200), a reproducing system (400), etc., which will be described later.

Therefore, in this apparatus, control is performed to irradiate the laser beams (5a) (5b) to desired recording tracks, and in this state, for example, as described below, the IID
Recording and reproduction of TV signals is performed.

First, record system (200) Nioiite, (2m (21B)
(21R) are the luminance signals Y and 2 of IIDTV, respectively.
two color difference signals P. ,P. The luminance signal Y from this terminal (21'/) is digitized by the AD converter (22Y) and sent to the time axis expansion circuit (TE
X) (23Y), and the time axis is expanded so that, for example, a 20 MHz bandwidth becomes 12 MHz. In addition, the color difference signals Pg and PR from the terminals (21B) (2++1) are digitized by AD converters (22B) (22R), respectively, and sent to the time axis compression circuit (TCP) (23C).
), and the time axis is compressed so that, for example, the 6MHz bandwidth becomes 12MHz. These time-axis compressed and expanded luminance signal Y and color difference signal P. ,P. is supplied to a signal processing circuit (24) to form a predetermined recording signal.

In other words, input terminals (21Y) (21B) (21R)
For example, as shown in FIGS. 3A to 3C, a luminance signal Y and color difference signals Pa and Pg are supplied, and these signals are respectively time-axis expanded and compressed, and are rearranged in a predetermined manner. Two-channel recording signals as shown in D and E of the figure are formed. Note that even-numbered color difference signals Pl and odd-numbered color difference signals PR are thinned out.

The two-channel recording signals formed by this circuit (24) are converted into analogs by DA converters (25a) and (25b), respectively, and then passed through a 12MHz low-pass filter (26a).
(26b) are supplied to adders (27a) and (27b). Further, (28L) and (28R) are input terminals to which, for example, stereo left and right audio signals are supplied,
Audio signal A from these terminals (28L) (28R)
L,A. are respectively brienphasis circuits (29L)
(29R) through AD converter (30L) (30R)
These digital signals are supplied to a signal processing circuit (3l) and are converted into, for example, an HDT.
For each predetermined period within the vertical planking period of the V signal,
The signals are arbitrarily interleaved, divided into two channels, and extracted. These two-channel digital signals are each supplied to a parity addition circuit (32a) (32b), and a parity code for error correction during playback, which will be described later, is added, and the signals to which these parity codes are added are added. (27a) (27b) and inserted into a predetermined period within the vertical blanking period of the recording signal described above.

The signals from these adders (27a) (27b) are sent to the bias circuits (33a) (33), respectively.
b) is supplied to the FM modulator (34a) (34b), and this FM modulated signal is supplied to the laser diode (34b).
The laser beams (6) are supplied to the drive circuits (35a) (35b) of
5a) (5b) is controlled intermittently.

Recording is performed in this manner.

On the other hand, during playback, the laser diode (6
) The laser beams (5a) (5b) generated by the laser beams (5a) and (5b) are adjusted to a predetermined level. Then, the signals detected by the sensor parts B and D of the photosensor (8) are transmitted to the reproduction system (400).
) are supplied to equalizer circuits (42a) (42b) through amplifiers (41a) (4lb), and the equalized signals are supplied to FM demodulators (43a) (4lb), respectively.
43b).

The signals demodulated by the demodulators (43a) and (43b) are supplied to AD converters (45a and 45b) through de-emphasis circuits (44a and 44b), respectively.
The digitized signal is transferred to the TBC circuit (46a) (4
In step 6b), the time axis is corrected. This time-base corrected signal is supplied to a signal processing circuit (47), where the rearrangement is performed in the opposite manner to that of the recording system processing circuit (24) described above. The monthly luminance signal Y in this rearranged signal is supplied to the time axis compression circuit (TCP) (48Y) and compressed so that the bandwidth of 12M7 becomes 20 MHz, and the DA
It is converted into analog by the converter (49Y) and sent to the output terminal (50Y).
) is taken out. Also, the color difference signal P in the rearranged signals. ,P. Tomoma is the time axis expansion circuit (TEX) (48
C) The width of the 12 MHz band is 6 MHz.
The signals expanded to z and thinned out during recording are interpolated, converted into analogs by DA converters (49B) (49R), and taken out to output terminals (50B) (50R).

Furthermore, the signals from the de-emphasis circuits (44a) (44b) are supplied to the data separation circuits (51a) (5lb), and the digital signals inserted in a predetermined period within the vertical blanking period in the recording system are separated. These separated digital signals are sent to TBC circuits (52a) and (5), respectively.
2b), the time axis is corrected, and the error correction circuit (53a)
) (53b), error correction is performed using the above-mentioned parity code. This error-corrected digital signal is supplied to a signal processing circuit (54), where it undergoes deinterleap, etc., which is the opposite of the recording system processing circuit (31) described above, and left and right data are separated and extracted.

These separated digital signals are each sent to a DA converter (
55L) (55R) and output terminal (57) through the de-emphasis circuit (56L) (56R).
L) (57R).

In this way, for example, by simultaneously using two recording tracks on the disk, recording and reproduction of wideband signals such as HDTV signals can be performed satisfactorily.

In this recording and reproduction, according to the above-mentioned apparatus, one piece of address information is provided for one set of a plurality of tracks that are used at the same time. In addition to being able to realize tracking, there is no risk of crosstalk of this address information to another group, and control during recording and reproduction can be performed satisfactorily.

In particular, when address groups are provided between recording tracks as in the above embodiment, for example, CLV
Even in the case where the address position is shifted, the possibility that this address information will cause interference to the recorded signals of the adjacent set can be extremely reduced.

In the above-mentioned apparatus, the structure of the address information is, for example, as shown in FIG. In other words, address information is provided from the tip (left end) side to a preamplifier of a predetermined length, followed by a mark indicating that it is address information, 0/E indicating odd and even fields of the video signal, and address information is repeatedly provided twice. l/2 indicating its rank, and 16
A four-digit address and two systems of parity codes P and Q are provided, and the portion below this mark is repeated.

Also, as shown in the figure, each of these pieces of information has, for example, a brianpulle and an address mark of 8 bits each.
0/E, 1/2 are 2 bits each, address is 4×
4 bins 1., P, and Q are each 4 bits, and each bit "0゛ is O→1."l" is l→0.
In response to this change, the actual recorded data has twice the number of bits. This brings the total number of recording bits to 16.
0 bit, and this address data is, for example, 12MI.
When recorded in Iz, the length corresponds to approximately one horizontal period of HDTV.

Therefore, by providing this address information, for example, in the section corresponding to the vertical synchronization signal of the recording signal, it is possible to detect the address information very well.

[Effects of the Invention] According to the present invention, since one address information is provided for IIJI of a plurality of tracks used simultaneously, proper tracking can be easily achieved using this address information. In addition, there is no risk of crosstalk of this address information to another group, and it has become possible to perform control during recording and reproduction, etc. in a good manner.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an example of a disk-type recording/reproducing apparatus according to the present invention, FIG. 2 is a block diagram of a preformant on an optical disk, FIG. 3 is a waveform diagram for explaining recording signals, and FIG. It is a diagram showing the structure of address information. (+1 is an optical disk, (2) is a spindle motor, (3
) is an optical head device, (4) is a thread moder, (5a
) (5b) is a laser beam, (6) is a laser diode, (7) is a two-axis device, (8) is a photosensor, (l3) is an address detection circuit, (l6) is a control CP
U, (100) is the servo system, (200) is the recording system, (4
00) is a reproduction system. Figure 4

Claims (1)

[Claims] When a rotating disk type recording medium is used and a plurality of tracks on the recording medium are simultaneously used to record and reproduce multi-channel signals, the recording medium is used simultaneously during the recording and reproduction. A disk type recording/reproducing device characterized in that one address information is provided for one set of the plurality of tracks.