JPH0266776A - Optical disk recording system - Google Patents

Abstract

PURPOSE:To obtain synchronization between program information send starting timing and write starting timing by providing a means which delays the inputted program information until the arrival of the timing when the writing to a disk is permitted. CONSTITUTION:Serial data formed in a data signal forming circuit are inputted to a buffer memory 50 of a delay circuit 40, the buffer memory 50 is respectively delayed and outputted by delay times DELTAt, 2DELTAt, 3DELTAt,...(n-1).DELTAt, n.DELTAt of the integer value of the prescribed time DELTAt. The respective delay outputs of the buffer memory 50 are inputted to a selector 52, the selector 52 selects any delay data by a delay time control signal sent from a system controller, and outputs them to a recording control means. Thus, by delaying the program information, the recording starting timing can be regulated, it is applied to a normal program information sending means, and the synchronization between the program information send starting timing and the read starting timing can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an optical disc recording system for recording information on a writable optical disc. This allows writing to be performed after waiting for the arrival of the data.

[Conventional technology]

Conventionally, as writable optical discs, there have been D RAW (write once) discs and E D RAW (erasable) discs. A DRAW disk can be written only once, and for example, there are disks in which the metal recording film is burned out by heat generated by laser beam irradiation to form information pits I-. E-DRAW disks are rewritable and include, for example, those that utilize magneto-optical recording and those that utilize phase change between a crystalline state and an amorphous state.

In a writable optical disc recording system, when trying to record program information (music information, etc.) sent from a program information sending means (CD player, tape deck, etc.) onto an optical disc, the program information sending means starts sending out the program information. The timing must be synchronized with the timing at which the optical disc recording system starts recording program information. This is because, for example, if the program information transmission start timing is earlier than the program information recording start timing, problems such as the beginning of the program information being recorded may occur.

Therefore, in order to synchronize the sending start timing and the writing start timing, there have conventionally been systems in which the start-up of the program information sending means is controlled in conjunction with the recording start operation of the optical disk recording system. Another method is to attach an index signal to the beginning of the program information and send it out so that the optical disc recording system reads this and starts the program.

[Problem that the invention attempts to solve]

The method of activating the program information exit means in conjunction with the recording start operation of the optical disc recording system is applicable to program information sending means that does not have a control system for activating the program information exit means in conjunction with the recording start operation of the optical disc recording system. I couldn't.

Further, the method of reading the index signal to start the optical TiSF recording system cannot be applied to program information sending means (for example, a CD player, etc.) that does not provide an index signal.

The present invention solves the problems in the conventional technology and makes it possible to synchronize the program information sending start timing and the program information recording start timing without having to strictly synchronize the program information sending means and the optical disk recording system. The present invention aims to provide an optical disc recording system that can be applied to program information transmitting means that does not have a control system linked to the optical disc recording system and program information transmitting means that does not provide an index signal. .

[Means for solving problems]

The present invention provides an input means for inputting program information sent from a program information sending stage, and input means for inputting program information sent from a program information sending stage, and the input program information until at least a timing when writing to a disk is allowed arrives. a delay means for delaying;
The apparatus includes program information recording control means for controlling writing of the program information output from the delay means onto the disk.

[For production]

According to this invention, the program information sent from the program information sending means is delayed by the delay means at least until a timing when writing to the disk is permitted, and the program information is recorded on the disk by the program information recording control means. Recording starts from a predetermined position. This makes it possible to adjust the recording start timing of the program information by delaying the program information, thereby eliminating the need for strict synchronization between the program information sending means and the optical disk recording system, and eliminating the need for the program information sending means itself. starts in conjunction with the optical disc recording system,
It is no longer necessary to add an index signal to the beginning of program information and send it out, and it can be applied to normal program information sending means.

〔Example〕

The present invention will be explained in detail below. Here, a case will be described in which program information is written in a CD format from the start position of a program area on a CD standard write-once optical disc. Additionally, in this embodiment, the operator first performs a standby operation to move the recording head of the optical disk recording system to the program area start position on the disk, and sets and displays a write standby flag. The optical disk recording system detects the sending of the program information, releases the standby state, and starts recording. In this recording, an index signal generated within the optical disc recording system is first written to indicate the starting position of the program area, and then program information is written. Furthermore, in this embodiment, the delay time by the delay means is defined as the time from when the sending of the program information is detected until the timing when writing of the program information is permitted, and when writing of the program information is permitted. The timing is defined as the timing at which writing of the index signal is completed. Furthermore, if this delay time is longer than the longest delay time of the delay means, writing is stopped.

First, the CD standard is shown in Figure 2. The CD has an outer diameter of 120 mm, and the lead-in area starts at a position approximately 46 mm in diameter from the center, and the program area extends from 50 m + n to 116 + nm in diameter, and after the program ends, the lead-in area starts at a position approximately 46 mm in diameter.
A lead-out area having a width of m or more is provided. In the lead-in area, TOC, that is, table of contents information of the disc is recorded. Program information is recorded in the program area. A signal indicating the end of the program is recorded in the lead-out area. As shown in Figure 2, each area contains position information from 1 to rack number (program number such as track number).
, time code (program time), and absolute time are recorded.

CD in the optical disc recording system to which this invention is applied.
FIG. 3 shows an example of the overall configuration of a system for recording and reproducing information on a standard disc in accordance with the CD standard.

The optical disc 1 has a recording surface made of a material that can be recorded by a semiconductor laser and has a relatively high light reflectance.

In addition, an optical disc (CD, CDROM, CD-I, CDV, etc.) whose mechanical dimensions are CD standard to be played by the playback device 3
It is constructed to meet the standard dimensions of

The recording device 2 (optical disk recording system) is one to which the present invention is applied, and includes a program information sending means 6 (CD
The program information sent out from the player, tape deck, etc.) is input from the input terminal 7 (input means), and the program information is input to the playback device 3.
Output at a predetermined transfer speed as a mark length recording method data signal that conforms to the CD standard format to be played back,
The optical disc 1 is driven at a CD standard linear velocity, and the position of the optical disc 1 and the semiconductor laser is controlled by a pre-group formed on the optical disc 1 in advance so as to match the CD standard track pitch. The irradiation state of the semiconductor laser is controlled in accordance with the data signal to break the recording surface of the optical disc 1 to form pits, thereby performing recording on the optical disc 1.

The optical disc 1 recorded by the recording device 2 is played back using a playback device 3 such as a CD, CI)-ROM, CI)-I, or CDV that is compatible with the optical disc 1.

Note that the recording device 2 and the reproducing device 3 can be integrated to form a recording/reproducing device.

Next, a specific example of the system shown in FIG. 3 will be explained.

Here, the conditions for the optical disc 1 are determined as shown in Table 1, for example.

Table 1 FIG. 4 shows an embodiment of an optical disc.

The optical disc 1 is made of polycarbonate 1~ or acrylic (PH
88) etc. on the surface of the transparent disk substrate 10.
, Sn alloys (for example, In-Ge alloys) and T e C
A thin film 12 having a thickness of several 1 Onl'Il is formed from a series alloy or the like, and this is used in a single plate format.

A pre-group (guide groove) 16 is provided on the substrate 10 and the thin film 12.
is formed, and a portion of the thin film 12 on this pre-group 16 is burned out by laser light to open a hole, which becomes a pit 18 for recording information.

The depth of the pre-group 16 is set to 20 to 50 nm. In addition, the pre-group width is 0.3μm to 1.3μm.
m is set.

When recording the pits 18 in the pre-group 16, either the three-beam method or the push-pull method can be used as a tracking error detection method. When recording pits 18 on lands 17, a three-beam method is used.

As mentioned above, the surface thin film 12 of the disk substrate 10 is made of In,
Alloys such as Bi and Sn (for example, In-Ge alloy) and T e
If it is made of a C-based alloy or the like, the reflectance of the mirror (plane) portion can be increased to 59 to 75%, and it can be played back even with existing CD playback devices.

A specific example of the recording device 2 shown in FIG. 3 is shown in FIG.

The diffuser pollo path 26 is connected to the system controller 29.
The disk motor 22 is controlled at a constant linear velocity according to the command from the controller. This constant linear velocity control is performed by calculation control based on the position of the optical head 23.

The focus servo and tracking servo circuit 28 controls the focusing and tracking of the laser beam irradiated from the semiconductor laser in the optical head 23 in response to commands from the system controller 29. Tracking control is performed by detecting a pre-croop formed on the disc 1. The feed servo circuit 27 is
Based on commands from the two system controllers, the feed motor 30 is driven to move the optical head 23 in the radial direction of the disk 1. The position detector 42 detects the state in which the optical head 23 is positioned at the program area start position (a position with a diameter of 50 nm).

The input signal to be recorded on the optical disc 1 is input directly to the data signal forming circuit 32 in the case of a digital signal, and is input to the data signal forming circuit 32 via the A/D converter 34 in the case of an analog signal.

The sampling frequency and data pick number of this human data are said to be compatible with CI) data. The data signal forming circuit 32 interleaves the input data, applies an error check code, forms a subcode, performs EFM modulation, and converts the input data into a standard format suitable for a CD and a transfer rate. form and output serial data.

The output data of the data signal forming circuit 32 is input to the recording control means 5 via the delay circuit 40 (delay means) according to the present invention, and is input to the data signal correction circuit 36 via the drive interface 25. The data signal correction circuit 36 corrects the waveform of the data signal according to its pitch 1 to equivalent length and immediately preceding blank equivalent length. That is, by increasing or decreasing the data signal timing, the positional deviation between the data signal timing and the recording pitch I~ and the blank due to the laser photothermal accumulation effect on the recording surface of the optical disc 1 is reduced, and at the same time, the recorded pit width is increased. This is prevented by dividing the data signal timing. Specifically, regarding the increase/decrease in the data signal timing, the irradiation time of the laser beam is shortened when a pit with a short preceding blank length is formed, and the irradiation time of the laser beam is shortened when a pit with a long preceding blank length is formed. The start of light irradiation is brought forward, and the irradiation time of the laser beam is shortened when forming long pips I~. Regarding the division of data signal timing, the pitch from 1 to the width is 0.3 to 0.9.
The number of divisions and the pulse width and pulse intensity of each divided laser beam pulse are determined so that the pulse is formed between micrometers. In addition,
Regarding this data signal correction, patent application No. 62-2870
There is a detailed explanation in the specification of No. 29.

The output data of the data signal correction circuit 36 is the laser generation time 1.
135. The laser generating circuit 35 drives the semiconductor laser in the optical head 23 in response to the data signal to irradiate the recording surface of the optical disc 1 with laser light to perform recording. As a result, the optical disc 1 has a transfer speed and a linear velocity (1.2 to 1.4 m/
The data is recorded in step s).

In addition to the above-mentioned controls, the system controller 29 also performs control to display a recording standby state on the program information sending detection display lamp 44 when recording program information, control to issue an index signal write command to the drive interface 25, and delay control. Controls the delay time of the circuit 40, etc.

Next, a specific example of the delay circuit 40 shown in FIG. 1 is shown in FIG.

The serial data formed by the data signal forming circuit 32 is input to the buffer memory 50 shown in FIG. The buffer memory 50 delays input serial data by delay times Δt, 2Δt, 3Δt, etc., which are integral multiples of a predetermined time Δt.
, (n-1), Δtn, and Δt, and are output with a delay, respectively. Note that Δt can be set to several hundred ms, for example.

In addition, n・Δt is, for example, 8 seconds (for example, ΔtO, 5s,
n=16).

The buffer memory 50 can be configured, for example, by a shift register and have hardware taps at positions corresponding to each delay time to take out each delay output, or can be configured by a RAM and can be roughly addressed by a microcomputer. Various configurations are possible, such as instructing and extracting delayed output.

Each delayed output of the buffer memory 50 is input to a selector 52. The selector 52 selects and outputs one of the delay data in response to a delay time control signal (delay data selection signal) sent from the system controller 29 (FIG. 1). In this embodiment, this selection control selects delayed data whose head position arrives when the timing at which writing to the disk 1 is permitted has arrived. In addition, the timing at which writing to the disk 1 is permitted is such that the optical head 23 is held at the start position of the program area, and the timing is such that the disk motor control, tracking control,
The timing is set as the timing at which writing of the index signal is completed after it is confirmed that the focus control etc. are normal.

Therefore, in this embodiment, the delay time in the delay circuit 40 is defined as at least the time from the detection of the start of sending out the program information to the end of writing the index signal.
For example, the system controller 29 can be configured to measure this time and output a delay time control signal to select the corresponding delay data. Note that when the index signal is not written, the delay time can be defined without considering the writing time of the index signal.

Next, a specific example of the write operation according to the embodiment described above will be explained with reference to FIG. When the operator performs a recording start operation on the recording device 2, a recording start command is given to the system controller 29. As a result, a write request signal (FIG. 6(a)) is raised in the system controllers 1 to O-rough 9, and a check is made to see if the disk 1 is present and ready for recording. When ready] 6 Write request l- signal falls. If you are not ready, make the necessary unit price. When the write rift varnish 1~ signal falls (write request state), the feed motor 23 is driven to move the optical head 23 to the starting position of the program area with a diameter of 5
0mm position).

Further, the disk motor 22 is also activated. When the position detector 42 detects that the optical head 23 has moved to the start position of the program area, the write standby flag falls, the foot motor 23 stops, and the indicator lamp 44 lights up to indicate the write standby state. I am informed of something (
Note that the display may be performed by sound. ). The operator sees this display and starts the program information sending means 6 (see (C)
)). When the program information sending means 6 is activated, it starts sending out the program information after a delay time due to mechanical delay or the like has elapsed ((d)).

Note that the program information sending means 6 can continuously send out a series of information (information including inter-musical parts) to be recorded in the entire program area shown in FIG.

After detecting the start of sending out program information, the system controller 29 checks whether the optical head 23 is securely held at a position of 50 mm in diameter, whether the focus is correct, whether the 1 to 0.00000 kink is normal, and whether the disk rotation is within the specified line. Check whether the speed is in the correct state, etc., and if all of these are normal, immediately lower the write enable signal ((C)) and output the index write command ((F)) for a predetermined period of time. During this time, an index message is written to the disk 1 via the drive interface 25. If any abnormality occurs, wait until the index becomes normal, output an index write command for a predetermined period of time, and write in the same manner. The system controller 1-roller 29 measures the time 'F1 until the optical head 23 is held at a position with a diameter of 5Qmm.

The sum T''+T2 of this time 'F and the index signal writing time T2 is defined as the delay time in the delay circuit 40, and the corresponding delay time control signal is output. (Note that this delay time 'V+72 is The index signal write time T1 is finely adjusted so that it becomes an integral multiple of the unit delay time Δt in the delay circuit 40.) As a result, the delay circuit 4
0 selectively outputs the corresponding delay signal ((g)), and program information can be written from the beginning of the program area. Note that the delay time is
If the delay time is longer than the longest delay time n·Δt, the writing is aborted and restarted from the beginning.

[Example of change]

In the above embodiment, the case where writing is performed from the start position of the program area has been described, but the present invention can also be applied to writing from the middle of the program area.

Further, although the above embodiment describes the case where writing is performed on an optical disc of the CD standard, the present invention can also be applied to optical discs of other standards.

Furthermore, although the embodiment described above does not show the case where the present invention is applied to a write-once optical disc, it can also be applied to an erasable optical disc.

〔Effect of the invention〕

As described above, according to the present invention, the recording start timing of the program information can be adjusted by delaying the program information, so that strict synchronization between the program information sending means and the optical disc recording system can be achieved. This eliminates the need for the program information sending means itself to be activated in conjunction with the optical disk recording system, eliminates the need to attach an index signal to the beginning of the program information and send it out, and can be applied to a normal program information sending means.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and shows a specific example of the recording device 2 shown in FIG. 3. As shown in FIG. FIG. 2 is a diagram showing the state of each area division of a CD standard disc and the P and Q channel subcode data recorded in each area. FIG. 3 is a block diagram showing an example of the overall configuration of a system for recording and reproducing information on a disc to which the present invention is applied. FIG. 4 is a diagram illustrating an example of the structure of the writable disk 1 of FIG. 3. FIG. 5 is a block diagram showing a specific example of the delay circuit 4o of FIG. 1. FIG. 6 is a time chart showing an example of the operation of the embodiment of FIG. 1. 1... recordable optical disc, 2... recording device (optical disc recording system), 5... recording control means ( program information recording control means), 6: program information sending means, 7: input terminal (input means), 4o: delay circuit (delay means).

Claims (1)

[Claims] Input means for inputting program information sent from the program information sending means; and delay means for delaying the input program information at least until a timing when writing to the disk is permitted has arrived. and program information recording control means for controlling writing of program information output from the delay means onto a disk.