JPH0576098B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical disc that allows additional recording on the user side (hereinafter simply referred to as a write-once optical disc).
The present invention relates to a data recording method.

[Prior Art] In recent years, optical disks (optical disk-shaped recording media) have attracted attention as a medium that can record high-density and large-capacity information. In order to randomly access and play desired recorded data from among the large amount of recorded data recorded on such an optical disk on each player of different manufacturers, the recorded data and the
It is necessary that lead-in data (address data) corresponding to this be recorded in a compatible format. For example, in a playback-only compact disc (hereinafter simply abbreviated as CD) in an optical digital audio disc, the fifth
As shown in the figure, a lead-in area 3 is provided at the innermost circumference of the spiral track 2 formed on the CD 1, and a recording area 4 is provided continuously at the terminal end 3e of this lead-in area 3. Recording data A, B, C, D such as music data is recorded in the recording area 4,
Lead-in data a, b, c, and d such as time information and frame numbers for recording data A, B, C, and D are recorded in the lead-in area 3. Conventional CD1
is for playback only, so the recording data A, B, C, D and the corresponding lead-in data a, b, c, d to be recorded on CD 1 are known in advance at the time of original cutting by the producer, so compatible formats are not available. There were no particular problems with recording with Matsuto.

[Problems to be solved by the invention] However, the above-mentioned CD can be additionally recorded on the user side (i.e., a write-once CD).
When I tried to do this, the following problems arose.

When the user records multiple types of music data on one CD in several parts, for example, on the first day, Beethoven's music is recorded as the first song.
If you add Schubert's music as the second song on the second day, etc., the lead-in data to be recorded in the lead-in area will change each time you add a song on the first day, second day, etc. Because I end up doing it,
Lead-in data can only be written and recorded after all songs have been recorded on the CD. Therefore, when recording lead-in data, it is necessary to detect the end of the recordable range (starting point of the recording data), but there is a problem in that it is difficult to accurately detect.

The present invention was made in view of the above-mentioned problems.
It is an object of the present invention to provide a method for simply and reliably recording recording data and corresponding lead-in data in a compatible format on a write-once optical disc.

[Means for Solving the Problems] The data recording method for a write-once optical disc according to the present invention is such that, at the time of manufacturing, either from the inner circumference to the outer circumference or from the outer circumference to the inner circumference of the optical disk. A spiral track is formed along the track to form a lead-in area, a marker area, a recording area, and a store area, and the tracking guides on both sides of the track in the marker area are designed to prevent the original tracking error during tracking servo. A marker is formed to obtain a marker signal that is distinguishable from the signal, and during additional recording, after recording data in the recording area, lead-in data corresponding to this recording data is recorded in the store area, and the compatible During formatting, the lead-in data in the store area is first transferred and recorded in the memory, and then the lead-in data in this memory is transferred and recorded in the lead-in area while monitoring the tracking error signal, and the tracking error signal is monitored. The present invention is characterized in that transfer recording to the lead-in area is stopped based on the detection of the marker signal in the signal.

[Function] During the manufacture of an optical disc, markers are formed on the tracking guides on both sides of the track in the marker area to obtain a marker signal that can be distinguished from the original tracking error signal during tracking servo. When the record button is pressed to input recording data (for example, music data) from the input circuit, a marker signal based on the marker of the tracking guide in the marker area is detected in the playback mode, and when this marker signal disappears, the recording area Therefore, the recording mode is entered, recording data is recorded in this recording area, and then lead-in data corresponding to this recording data is recorded in the store area. When a compatible format signal is input from the input circuit, the lead-in data in the store area is first transferred and recorded in the memory, then the lead-in data in this memory is transferred and recorded in the lead-in area, and at the same time during this transfer recording, the King error signal is monitored. In this recording mode, when a marker signal is detected in the tracking error signal, it is determined that the lead-in area has ended, and transfer recording to the lead-in area is stopped. In this way, by detecting the marker signal, it is possible to accurately detect the end of the recordable area for lead-in data.

[Embodiment] FIGS. 1 to 4 show an embodiment of the data recording method according to the present invention.

FIG. 1 shows a block diagram of an apparatus for carrying out the data recording method according to the present invention. In this figure, numeral 10 is for inputting recording data such as audio signals and signals for compatible format from a microphone or line. This is the input circuit. The output side of this input circuit 10 is connected to a CD format encoder 12 via an A-D conversion circuit 11. The CD format encoder 12 is
This is a circuit that adds lead-in data such as time data, frame number data, error correction data, etc. corresponding to the recording data, and the data output from this CD format encoder 12 is connected to the recording data line 1.
Optical head 18 for recording and playback via 7
connected to the recording input side of the The reproduction output side of the optical head 18 is connected to an audio signal output terminal 20 via a reproduction circuit 19 and also to a control circuit 21 . The control circuit 21 includes a memory 2 for recording lead-in data.
2 is provided. 1 is an optical digital audio disk as an example of an optical disk.
A CD (compact disc), the CD 1 is controlled to a predetermined rotational speed by a motor 24 driven by a drive signal from a motor drive circuit 23. 25 controls the movement of the optical head 18 in the radial direction of the CD 1, and also controls the movement of the optical head 18.
This is a servo mechanism that controls the focus, tracking, etc. of the laser beam 26 irradiated from the CD 1 to the CD 1. Reference numeral 27 denotes a marker detection circuit for detecting a marker signal (for example, 40 KHz) from among the tracking error signals sent from the optical head 18 to the servo mechanism 25. The control circuit 21 is
The CPU (Central Processing Unit) is the main body, and the
CD format encoder 12, playback circuit 19,
It is configured to control the motor drive circuit 23 and the servo mechanism 25. Further, based on the compatible format signal input from the input circuit 10 via the A-D conversion circuit 11 and the first signal line (l ₁ ), the read data recorded in the store area 29 of the CD 1 is read. Read out the internal data,
a first transfer recording means for transferring and recording this lead-in data to the memory 22 in the control circuit 21 via the reproduction circuit 19;
The servo mechanism 25 is controlled to move the laser beam 26 from the vicinity of the starting end 4s of the recording area 4 inward to the approximate distance necessary for the lead-in area (for example, 2
~3mm) to start end 3 of lead-in area 3
a servo control means for positioning the CD 1; a rotation control means for forwardly rotating the CD 1 after this positioning; and a rotation control means for forwardly rotating the CD 1;
It is provided with a second transfer recording means for transferring and recording from s to the terminal end 3e.

In addition, in the transfer recording from the store area 29 to the memory 22 in the first transfer recording means,
Even if the lead-in data recorded in the store area 29 has a lot of signal redundancy, the playback circuit 19
The signals are combined into lead-in data with less signal redundancy and then recorded in the memory 22.
Furthermore, in the recording mode during the second transfer recording, the control circuit 21 sends a motor stop signal to the motor drive circuit 23 based on a detection signal inputted from the marker detection circuit 27 via the second signal line (l ₂ ). It is configured to output the information and stop recording on the CD 1.

Next, the operation of FIG. 1 will be explained with reference to FIGS. 2, 3, and 4.

(b) First, when manufacturing CD1 on the manufacturer's side, as shown in Figures 2 and 3,
A lead-in area 3, a marker area 30,
A recording area 4 and a store area 29 are formed, and the tracking guides 6 and 7 on both sides of the track 2 in the marker area 30 are provided with a predetermined cycle.
A marker 33 is formed, which includes a cut portion 31 cut at Tm=1/fm (for example, fm=40 KHz) and a non-cut portion 32. The track length of this marker area 30 is assumed to be a certain period T ₁ (for example, 0.1 seconds).

(b) Next, suppose that the user presses the record button to record Beethoven's music data A as the recording data of the first song on the first day in data recording on the CD 1. Then, first, the servo mechanism 25 and the motor drive circuit 23 are controlled by the control signal from the control circuit 21, and the laser beam 26 of the optical head 18 comes to the area inside the marker area 30 (for example, the lead-in area), and the CD 1 is moved. It rotates forward and enters playback mode. In the tracking servo in this reproduction mode, after the marker detection circuit 27 detects a marker signal in the tracking error signal, when the detection signal disappears, the recording area becomes a recording area where nothing has been recorded yet, so the recording mode becomes.

(c) In this recording mode, the music data A input from the input circuit 10 and the lead-in data a corresponding to the music data A added by the CD format encoder 12 are transferred to the optical head via the recording data line 17. As shown in FIG.
Recording area 4 of spiral track 2 of CD 1,
Data is recorded in a store area 29 provided at the outermost periphery of the track 2 from the inner periphery of the track 2 toward the outer periphery.

(d) Then, on the second, third, and fourth days, music data B, C, and D for the second, third, and fourth songs, respectively.
are additionally recorded, these music data B, C, and D and the corresponding lead-in data b, c, and d will be recorded in substantially the same manner as in (b) and (c) above.
As shown in FIG. 2, additional recording is made in the recording area 4 and the store area 29, respectively. At this point, nothing is recorded in the lead-in area 3.

(e) When the recording of music data A, B, C, and D and the corresponding lead-in data a, b, c, and d is completed on CD1, write a compatible file to make this CD1 playable on each manufacturer's player. Format. That is, when a compatible format signal is input to the control circuit 21 via the first signal line (l ₁ ) by pressing the formatting button of the input circuit 10, the first transfer recording means of the control circuit 21 inputs the signal for compatible formatting. ,first,
Lead-in data a, b, c, and d recorded in the store area 29 of the CD 1 are reproduced by the optical head 18 and transferred and recorded in the memory 22 via the reproduction circuit 19.

(f) Next, the servomechanism control means of the control circuit 21 moves the laser beam 26 of the optical head 18 inward from the vicinity of the starting end 4s of the recording area 4 by an approximate distance (for example, 2.5 mm) to reach the starting end of the lead-in area 3. Position the section 3s.

(g) Then, by the rotation control means of the control circuit 21
The CD 1 is rotated in the forward direction, and during this forward rotation, the second transfer recording means of the control circuit 21 causes the memory 2 to
Lead-in data No. 2 is transferred and recorded from the start end 3s of the lead-in area 3 toward the end end 3e.

(h) During this transfer recording (recording mode), when the laser beam 26 passes the end 3e of the lead-in area 3 and reaches the marker area 30, the tracking error signal during tracking servo is Error signal (0~5K
Hz) on which a marker signal (for example, 40KHz) is superimposed. That is, as shown in FIG. 4a, even if there is no original tracking error, if the spot (L ₁ ) hits the notch 31 of one of the tracking guides 6 and 7, tracking will not occur. The error signal swings to the + side. Notch 31 in the other 7 of the tracking guides 6 and 7
When the spot (L ₂ ) is hitting, the tracking error signal swings to the negative side. Therefore, the original tracking error signal Se is
Assuming that the period is Ts (=1/fs, for example, fs = 5KHz) as shown by the dotted line in Figure b, the tracking error signal S sent from the optical head 18 to the servo mechanism 25 is shown by the solid line in Figure b. , the signal Se has a period Tm (=1/fm, for example fm=
40KHz) marker signal is superimposed on the signal. Therefore, the marker signal with the period Tm is separated and detected by the marker detection circuit 27, which is composed of an HPF (high pass filter) or BPF (band pass filter), or the like. Therefore, it becomes easy and reliable to detect whether or not there is a marker signal in the tracking error signal.

(li) When the detection signal detected by the marker detection circuit 27 is input to the control circuit 21, the control circuit 21 determines that the lead-in area 3 has ended and outputs a stop signal to the motor drive circuit 23 to start the CD1. Stop rotation and finish recording to CD1.

In the above embodiment, the markers formed on the tracking guides on both sides of the track in the marker area of the CD are formed at a constant period during manufacturing by the manufacturer.
Although a marker signal with a constant period Tm is formed in a tracking error signal during tracking servo by forming a notch part of Tm and a non-notch part, the present invention is not limited to this. Any marker signal that can be distinguished from the original tracking error signal during king servo may be obtained. For example, it may be a marker that provides a marker signal with a sweep waveform whose period changes.

In the above embodiment, in the case of a compatible format in which the innermost circumference of the CD track is the lead-in area, the innermost circumference and the outermost circumference are used as the lead-in area and the store area, respectively. In the case of a compatible format in which the lead-in area is the innermost periphery and the outermost periphery, the store area and the lead-in area may be used, respectively.

In the embodiment described above, a plurality of pieces of recorded data (music data) are recorded on a CD in multiple batches, but the present invention is not limited to this. It can also be used when recording only data) and converting it into a compatible format.

In the above embodiment, a method for recording predetermined data on a CD in an optical digital audio disc was explained, but the present invention is not limited to this, and can also be applied to a method for recording predetermined data on an optical video disc. can do.

[Effects of the Invention] As described above, in the data recording method for a write-once optical disc according to the present invention, one of the innermost circumference and the outermost circumference of the spiral track of the optical disk is used as a lead-in area, and the other is used as a storage area. When recording data, the lead-in data corresponding to the recorded data is first recorded in the store area, and when a predetermined amount of data has been recorded and a compatible format is performed, it is recorded in the store area. Since the read-in lead-in data is transferred and recorded in the original lead-in area, the compatible format of the optical disc becomes simple and reliable. Moreover, during manufacturing, markers are placed on the tracking guides on both sides of the track in the marker area provided between the lead-in area and the recording area to obtain a marker signal that can be distinguished from the original tracking error signal during tracking servo. The tracking servo signal is monitored when lead-in data is transferred to the lead-in area, and when a marker signal component is detected in this tracking error signal, the rotation of the optical disk is stopped and recording is completed. So,
The end of the recordable range of the lead-in area can be reliably detected, and unnecessary signals are not recorded in the recording area.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the data recording method for a write-once optical disc according to the present invention. FIG. 1 is a block diagram of an apparatus for carrying out the method of the present invention, and FIG. A plan view of a compatible formatted compact disc (CD), Fig. 3 is a sectional view taken along the line P-P in Fig. 2, and Fig. 4 shows tracking error signals for the markers of the tracking guides on both sides of the track in the marker area. FIG. 5 is a plan view showing a compatible format state of a conventional playback-only compact disc (CD) produced by original cutting. 1... Compact disc (CD) (optical disc), 2... Track, 3... Lead-in area,
4... Recording area, 6, 7... Tracking guide, 10... Input circuit, 12... CD format encoder, 17... Recording data line, 1
8...Optical head, 19...Reproduction circuit, 21...
control circuit, 22...memory, 26...laser light,
27... Marker detection circuit, 29... Store area, 30... Marker area, 33... Marker.

Claims (1)

[Claims] 1. At the time of manufacturing, a lead-in area, a marker area,
In order to form a spiral track that forms a recording area and a store area, and to obtain a marker signal that can be distinguished from an original tracking error signal during tracking servo on the tracking guides on both sides of the track in the marker area. After recording data in the recording area at the time of additional recording, lead-in data corresponding to this recording data is recorded in the store area, and at the time of compatible formatting, first the data in the store area is recorded. Transferring and recording lead-in data to a memory, then monitoring a tracking error signal while transferring and recording the lead-in data of this memory to the lead-in area, and based on the detection of the marker signal in the tracking error signal. 1. A data recording method for a write-once optical disc, characterized in that transfer recording to the lead-in area is stopped.