JPH05282671A - Optical information recording method and its device - Google Patents

Abstract

PURPOSE:To appropriately record information even in the case of occurring the unevenness of movement or rotation of the optical information recording medium. CONSTITUTION:At the time of starting recording information, the recording object information is stored in a buffer memory 222. At the time of recording, the reflection light is received by an optical pickup 233, thereby wobble signals and ATIP signals recorded on the optical disk 1 is detected. Based on the information included in these signals, the rotational state of the optical disk 1 is detected. The information stored in the buffer memory 222 is successively recorded on the optical disk 1 by synchronizing with clock signals generated from wobble signals. Since the information is recorded by synchronizing with the rotation of the optical disk 1, even though the rotation of the optical disk 1 is unstable, the information is recorded corresponding to it. Thus, the generation of jitters and errors at the time of reproducing information can be reduced, thereby the stability of information reproduction is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvements in an optical information recording method and its apparatus.

[0002]

2. Description of the Related Art Conventionally, in an information recording apparatus for an optical disc, while rotating the optical disc by a spindle motor, the recording layer of the optical disc is altered or deformed by the laser beam, and the reflection direction or reflectance of the laser beam at the time of reproduction is determined. Information is being recorded under different conditions.

[0003]

Therefore, if the linear velocity or the rotation of the spindle motor becomes uneven for some reason during the recording of information, the influence (periodic fluctuation of the signal, etc.) is directly recorded on the medium. It remains and it becomes impossible to reproduce accurate information at the time of reproduction.

That is, when the linear velocity or the rotation of the spindle motor becomes uneven due to some reason such as a disturbance (vibration, mechanical shock) or a defect during the recording of information on the recording medium, this influence (periodic fluctuation of the signal) Etc.) remains in the information recorded on the medium as it is. For this reason, the influence of recording appears as it is in the period of the signal generated when information is reproduced, which leads to an increase in jitter and an increase in errors.

In view of the above problems, an object of the present invention is to provide an optical information recording method and an optical information recording apparatus which can appropriately record information even when the movement or rotation of the optical information recording medium is uneven. It is in.

[0006]

In order to achieve the above object, the present invention provides, in claim 1, a driving means for moving or rotating an optical information recording medium, and the optical information recording medium based on information to be recorded. In the optical information recording method for recording the information to be recorded on the optical information recording medium by using a laser beam irradiating means for irradiating a laser beam on the optical information recording medium, the state of movement or rotation of the optical information recording medium is detected, An optical information recording method for controlling the irradiation of the laser light based on the detection result and the recording target information is proposed.

According to a second aspect of the present invention, in the optical information recording method according to the first aspect, a signal previously recorded on the optical information recording medium is reproduced, and the optical information recording medium is moved based on the reproduced signal. Alternatively, we propose an optical information recording method that detects the state of rotation.

Further, in a third aspect of the present invention, in the optical information recording method according to the second aspect, a wobble signal recorded in a groove or an ATIP (Absolute) is recorded as a signal previously recorded in the optical information recording medium. Time I
We propose an optical information recording method using n Pregroove) signals.

According to a fourth aspect of the present invention, there is provided a light comprising drive means for moving or rotating the optical information recording medium, and laser light irradiating means for irradiating the optical information recording medium with laser light based on information to be recorded. In the information recording device, state detecting means for detecting a state of movement or rotation of the optical information recording medium,
There is proposed an optical information recording apparatus provided with a laser light irradiation control means for controlling the irradiation of the laser light by the laser light irradiation means based on the detection result of the state detection means and the recording target information.

According to a fifth aspect of the present invention, in the optical information recording apparatus according to the fourth aspect, the state detecting means has a signal reproducing means for reproducing a signal previously recorded on the optical information recording medium. An optical information recording device is proposed which detects a moving or rotating state of the optical information recording medium based on a reproduction signal.

Further, according to a sixth aspect, in the optical information recording apparatus according to the fifth aspect, the state detecting means is a wobble (wobb) recorded in a groove of the optical information recording medium.
le) signal or ATIP (Absolute Time In Pregroov
e) An optical information recording apparatus is proposed which reproduces a signal and detects the state of movement or rotation of the optical information recording medium based on the reproduced signal.

[0012]

According to the first aspect of the present invention, when recording information on the optical information recording medium, the optical information recording medium is moved or rotated by the driving means. Further, this state is detected, based on the detection result and the recording target information,
Irradiation of laser light by the laser light irradiation means is controlled, and information is recorded on the optical information recording medium in synchronization with movement or rotation of the optical information recording medium.

According to a second aspect of the present invention, the signal recorded in advance on the optical information recording medium is reproduced, and the moving or rotating state of the optical information recording medium is detected based on the reproduced signal. At the same time, information is recorded on the optical information recording medium in synchronization with the movement or rotation of the optical information recording medium.

Further, according to a third aspect of the present invention, as a signal pre-recorded on the optical information recording medium, a wobble signal recorded in a groove or an ATIP signal.
(Absolute Time In Pregroove) signal is used to detect the movement or rotation state of the optical information recording medium based on the wobble signal or ATIP signal, and is synchronized with the movement or rotation of the optical information recording medium. Then, information is recorded on the optical information recording medium.

According to a fourth aspect of the present invention, the optical information recording medium is moved or rotated by the driving means when the information is recorded on the optical information recording medium. Further, this state is detected by the state detection means, and the laser light irradiation control means controls the irradiation of the laser light by the laser light irradiation means based on the detection result and the information to be recorded, and the movement of the optical information recording medium. Alternatively, information is recorded on the optical information recording medium in synchronization with the rotation.

According to a fifth aspect of the present invention, the signal reproducing means reproduces a signal previously recorded on the optical information recording medium, and the optical information recording medium is moved or rotated based on the reproduced signal. The condition is detected. Further, the laser light irradiation control means controls the irradiation of the laser light by the laser light irradiation means, and information is recorded on the optical information recording medium in synchronization with the movement or rotation of the optical information recording medium.

Further, according to a sixth aspect of the present invention, the state detecting means causes a wobble signal or ATIP (Abs) recorded in the groove of the optical information recording medium.
olute Time In Pregroove) As the signal is played,
The movement or rotation state of the optical information recording medium is detected based on the reproduction signal, and the laser light irradiation control means controls the irradiation of the laser light by the laser light irradiation means based on the detection result and the recording target information. The information is recorded on the optical information recording medium in synchronization with the movement or rotation of the optical information recording medium.

[0018]

1 is a block diagram showing an optical information recording apparatus according to an embodiment of the present invention, which is a Recordabule Compact Disc.
It is a takeover of the system standard. In the figure, 1
Is an optical disc, 2 is an optical information recording device, and a data input unit 2
1, a data conversion unit 22, and a recording unit 23.

The optical disc 1 is made of, for example, a write-once compact disc, and a spiral groove (guide groove) 11 wobbling (swinging) at a predetermined cycle is formed on the information recording surface thereof, as shown in FIG. Then, tracking can be performed using the groove 11. Further, an ATIP code (absolute time information) is recorded in the groove itself, and by detecting this ATIP code, the movement of the optical pickup described later can be performed accurately (Japanese Patent Laid-Open No. 56-105343, Japanese Patent Laid-Open No. 105343). Sho 6
3-87682, JP-A-63-10345).

The data input section 21 includes an analog input interface 211, an analog / digital (hereinafter referred to as A / D) converter 212, and a digital input interface 21.
3 and a changeover switch 214. If the information to be recorded is supplied as an analog signal, this analog signal will be transmitted via the analog input interface 211 to the A
It is input to the / D converter 212 and converted into a digital signal DA1. When the information to be recorded is supplied by a digital signal, this digital signal is input to the digital input interface 213 and input to the changeover switch 214 as the digital signal DA2. The changeover switch 214 selects one of the digital signals DA1 and DA2 according to the supply state of the recording target information and outputs it to the data conversion unit 22.

The data converter 22 is composed of a well-known EFM encoder 221 and a buffer memory 222.
The EFM encoder 221 receives the digital signal DA output from the data input unit 21 from the EFM (Eight to Fourteen M).
odulation) Modulate and output to the buffer memory 222. Further, the buffer memory 222 sequentially stores the digital data output from the EFM encoder 221, and stores the digital data accumulated based on a control signal from a system controller 231 of the recording unit 23, which will be described later, in the recording unit 2.
Output to 3.

The recording unit 23 is a system controller 231.
, A spindle motor 232, an optical pickup 233, a signal processing circuit 234, a synchronizing circuit 235, a recording correction circuit 236, and a tracking control circuit 237. The spindle motor 232 rotates the optical disc 1 at a rotation speed based on a control signal from the system controller 231.
As is well known, the optical pickup 233 is composed of a laser diode, a lens, a mirror, a photodetector, etc., emits a laser beam based on a recording signal output from the recording correction circuit 236, and receives a reflected light from the optical disc 1. Then, the light reception signal PS corresponding to this is output.
Also, the optical pickup 233 is a tracking control circuit 237.
Based on the control signal from the groove 1 of the optical disc 1.
It is configured to be movable so that the irradiation position of the laser beam can be tracked corresponding to 1.

The signal processing circuit 234 includes an optical pickup 233.
The received light signal PS output from the
The focus control of the optical pickup 233 is performed based on S, the wobbling period of the groove 11 (hereinafter referred to as a wobble signal) is detected from the light reception signal PS, and the clock signal CK synchronized with the wobble signal is generated to generate the system controller 231. And to the synchronizing circuit 235. That is, when the rotation speed of the optical disc 1 changes and the detection period of the wobble signal changes, the period of the clock signal CK generated correspondingly also changes. Furthermore, the signal processing circuit
234 detects the ATIP code from the received light signal PS,
Absolute time system controller based on TIP code
Output to 231.

The synchronizing circuit 235 receives the EFM-modulated digital data from the buffer memory 222, receives the control signal from the system controller 231, and the signal processing circuit 234.
Based on the clock signal CK from, the input digital data is output at a predetermined timing synchronized with the clock signal CK.

The recording correction circuit 236 inputs the digital data output from the synchronizing circuit 235, responds to the digital data, and based on the control signal from the system controller 231, sets the duty of the voltage and the pulse width to the optimum values. The optical pickup that generates the recording signal set to
Output to 233.

The tracking control circuit 237 moves the position of the optical pickup 233 based on the control signal from the system controller 231, and at the same time, the optical pickup 233.
The irradiation position of the laser light is tracked corresponding to the groove 11 of the optical disc 1 based on the received light signal PS from. Further, when the tracking is lost, a tracking error signal ER is output to immediately notify the system controller 231 of this.

According to the present embodiment having the above-mentioned configuration, when the information to be recorded is input to the data input section 21, the data for a predetermined time is stored in the buffer memory 222 before the information is recorded on the optical disc 1. Accumulated. The system controller 231 drives the spindle motor 232 to rotate the optical disc 1 at a predetermined rotation speed, detects that a predetermined amount of data has been stored in the buffer memory 222, and then stores the previously stored data. Starting from buffer memory 22
Output from 2. In addition, the system controller 231
Starts tracking from the information recording start position via the tracking control circuit 237.

As a result, the data output from the buffer memory 222 is synchronized with the clock signal CK by the synchronizing circuit 235, is output at a predetermined timing, and is converted into a recording signal by the recording correction circuit 236. Based on this recording signal, pulsed laser light is emitted from the optical pickup 233, and information is recorded on the optical disc.

On the other hand, when the rotation of the optical disk 1 (rotation of the spindle motor 232) changes, the cycle of the clock signal CK generated by the signal processing circuit 234 also changes correspondingly, so that the recording correction circuit 236 changes the cycle. The cycle of the output recording signal is changed according to the rotation of the optical disc 1 (rotation of the spindle motor 232). At this time, the data output with respect to the data input is temporally adjusted in the buffer memory 222 under the control of the system controller 231. Further, although the optimum value of the laser output changes with the change of the rotation speed, the linear velocity, etc., under the control of the system controller 231, in the recording correction circuit 236, the laser output is optimally adjusted to the rotation number and the linear velocity of the optical disc 1. The voltage value of the recording signal and the duty of the pulse width are changed so that the value becomes a value. As a result, it is possible to reduce the occurrence of jitters and errors during the reproduction of the information recorded on the optical disc 1, and it is possible to improve the stability of the information reproduction.

1 Mb as the above-mentioned buffer memory 222
When the it DRAM is used, the storage time of the input data is about 0.7 s. In this case, since the time delay with respect to the input data and the fluctuation such as rotation are very short in time, the data storage available time in the buffer memory 222 of about 0.1 s is sufficiently practical.

By the way, in order to manipulate the waveform of the recording signal to obtain a better recording state, it is general to make a correction at the recording time. It is desirable to provide it between the pickup 233 and the synchronizing circuit 235. At this time, the recording correction circuit 236 and the synchronization circuit 235 may be mixed.

Further, as shown in FIG. 3, a buffer memory 222 is provided in front of the EFM encoder 221, and the clock signal generated by the signal processing circuit 234 is controlled by the clock generation circuit of the EFM encoder 221 as an external control (optical disc 1).
Alternatively, a clock signal generated from information (wobble signal) pre-recorded in (1) may be input.

That is, in the configuration shown in FIG. 3, the digital data DA output from the data input unit 21 is input to the buffer memory 222, and the data output from the buffer memory 222 is input via the EFM encoder 221 to the recording correction circuit 236. Entered in. Further, a synchronizing circuit 238 is provided instead of the synchronizing circuit 235, and the synchronizing signal generated from the clock signal CK in the synchronizing circuit 238 is input to the EFM encoder 221.

In this case, since the EFM encoder 221 does not perform EFM modulation and an error correction code such as CIRC is not added, the amount of accumulated data is reduced. There is a data accumulation time of about 4 seconds.

Although the information recording medium is a write-once compact disc in this embodiment, the information recording medium is not limited to this.

In the present embodiment, the rotation state of the optical disc 1 is detected by using the wobble signal recorded in advance on the optical disc 1, but the present invention is not limited to this.
Almost the same effect can be obtained by using other detecting means such as a sensor for detecting the rotation speed of the spindle motor 232.

[0037]

As described above, according to claim 1 of the present invention, since information is recorded on the optical information recording medium in synchronization with the movement or rotation of the optical information recording medium, the optical information recording is performed. Even when the movement or rotation of the medium fluctuates,
Since information is recorded corresponding to this, it is possible to reduce the occurrence of jitters and errors during information reproduction, and improve the stability of information reproduction.

According to a second aspect, in addition to the above effects, a signal recorded in advance on the optical information recording medium is reproduced, and the optical information recording medium is moved or moved based on the reproduced signal. Since the rotation state is detected, the error in detecting the movement or rotation state of the optical information recording medium can be reduced, and the stability of information reproduction can be further improved.

Further, according to claim 3, in addition to the above effects, a wobble signal or ATIP (Absolute Time I) which is pre-recorded on the optical information recording medium.
n Pregroove) signal is reproduced, and the moving or rotating state of the optical information recording medium is detected based on the wobble signal or ATIP signal, so that the moving or rotating state of the optical information recording medium is accurately detected. Therefore, the stability of information reproduction can be further improved.

According to the fourth aspect, since information is recorded on the optical information recording medium in synchronization with the movement or rotation of the optical information recording medium, the movement or rotation of the optical information recording medium fluctuates. Even in such a case, since information is recorded corresponding to this, it is possible to reduce the occurrence of jitters and errors during reproduction of information, and improve the stability of information reproduction.

According to claim 5, in addition to the above effect, a signal recorded in advance on the optical information recording medium is reproduced by the signal reproducing means, and the optical information recording medium is reproduced based on the reproduced signal. Since the moving or rotating state of the optical information recording medium is detected, the error in detecting the moving or rotating state of the optical information recording medium can be reduced, and the stability of information reproduction can be further improved.

Further, according to claim 6, in addition to the above effects, a wobble signal or ATIP (Absolute Time I) recorded in advance on the optical information recording medium.
n Pregroove) signal is reproduced, and the moving or rotating state of the optical information recording medium is detected based on the wobble signal or ATIP signal, so that the moving or rotating state of the optical information recording medium is accurately detected. It is possible to achieve this, and it is possible to achieve a very excellent effect that the stability of information reproduction can be further improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an optical information recording device in an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an optical disc according to an embodiment.

FIG. 3 is a configuration diagram showing an optical information recording device in another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 11 ... Groove, 2 ... Optical information recording device, 21 ... Data input part, 211 ... Analog input interface, 212 ... A / D converter, 223 ... Digital input interface, 214 ... Changeover switch, 22 ... Data conversion Section, 221 ... EFM encoder, 222 ... buffer memory, 23 ... recording section, 231 ... system controller, 232
... Spindle motor, 233 ... Optical pickup, 234 ... Signal processing circuit, 235 ... Synchronization circuit, 236 ... Recording correction circuit, 23
7… Tracking control circuit.

Claims (6)

[Claims] 1. An optical information recording medium, comprising: a driving unit for moving or rotating the optical information recording medium; and a laser beam irradiating unit for irradiating the optical information recording medium with a laser beam based on information to be recorded. In the optical information recording method for recording the recording target information, the state of movement or rotation of the optical information recording medium is detected, and the irradiation of the laser beam is controlled based on the detection result and the recording target information. An optical information recording method characterized by: 2. A signal recorded in advance on the optical information recording medium is reproduced, and a moving or rotating state of the optical information recording medium is detected based on the reproduced signal. Optical information recording method described. 3. A wobble (wo w) recorded in a groove as a signal pre-recorded on the optical information recording medium.
bble) signal or ATIP (Absolute Time In Pregro
3. The optical information recording method according to claim 2, wherein an ove) signal is used. 4. An optical information recording apparatus comprising: a driving means for moving or rotating the optical information recording medium, and a laser light irradiating means for irradiating the optical information recording medium with a laser beam based on information to be recorded. State detection means for detecting the state of movement or rotation of the optical information recording medium, and laser light for controlling laser light irradiation by the laser light irradiation means based on the detection result of the state detection means and recording target information. An optical information recording device comprising: an irradiation control unit. 5. The state detecting means has a signal reproducing means for reproducing a signal recorded in advance on the optical information recording medium, and the state of movement or rotation of the optical information recording medium based on the reproduced signal. Is detected.
The optical information recording device described. 6. The state detecting means reproduces a wobble signal or an ATIP (Absolute Time In Pregroove) signal recorded in a groove of the optical information recording medium, and the optical information is reproduced based on the reproduced signal. 6. The optical information recording device according to claim 5, wherein a state of movement or rotation of the recording medium is detected.