JP2000222750A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device that records and reproduces information on a recording carrier, conducts a safe and stable track jump detection in both real time and non-real time recordings of continuous data and does not degrade the reliability of the data and a real time system. SOLUTION: The device is provided with a first track jump detecting means 110 which detects the fact that the positional deviation between light beams and a track exceeds a prescribed value and has a fast detecting speed, and a second track jump detecting means 111 which has a slow detecting speed and a high detection precision and makes no maldetection. A recording stopping means 104 selects either one of the means 110 or 111 depending on the operating condition of the device, discriminates the fact that the output of the device becomes a prescribed condition and stops a recording operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recording a signal while performing tracking control so that a light beam generated from a light source is converged on a record carrier and is always scanned on a track. The present invention relates to an optical disk device that performs or reproduces data.

[0002]

2. Description of the Related Art Due to favorable materials such as operability, simplicity, mass productivity and quick access of a recording medium, an optical disk apparatus for recording or reproducing a signal on a disk-shaped record carrier has been widely spread.

Conventionally, an invention related to this type of apparatus is disclosed in, for example, Japanese Patent Application Laid-Open No. 59-11546. FIG. 4 shows a configuration of a conventional optical disk device. FIG.
, 401 is a record carrier having a track for recording a signal, 402 is an optical head for irradiating a light beam on the record carrier 401, 403 is a signal recording means for recording a signal on the record carrier 401, and 405 is a record carrier A spindle motor for rotating 401; a spindle motor 4 for 406;
Motor control means for controlling 05 to rotate at a predetermined number of revolutions, 407 means moving means for moving the light beam in the width direction of the track, and 408 a track shift detection for detecting a position shift between the track on the record carrier 401 and the light beam. Means, 409
Is a tracking control means for controlling the light beam to be positioned on the track by driving the moving means 407 in accordance with a signal from the track shift detecting means 408, and 410 is a position shift between the light beam and the track exceeding a predetermined value. A track jump detecting means 404 for detecting that the output of the track jump detecting means 410 has reached a predetermined state and stops the recording operation of the signal recording means 403.

[0004] The operation of the conventional optical disk apparatus thus configured will be described. The record carrier 401 is rotated by a spindle motor 405 controlled to a predetermined rotation speed by a motor control unit 406. Optical head 402
The track on the record carrier 401 is irradiated with a light beam from the optical disc, and the position shift between the track on the record carrier 401 and the light beam is detected by the track shift detecting means 408. Drives the moving means 407 so that the light beam is positioned on the track. Recording of information is performed by signal recording means 4
This is performed by irradiating the output of the optical disc 03 on the track on the record carrier 401 via the optical head 402.

Here, during recording of information on the record carrier 401, if an external vibration or impact is applied to the apparatus, or if the record carrier 401 has a large scratch or the like, the light beam may cause a track jump. In this case, the track jump detection means 410 detects from the output of the track deviation detection means 408 that the positional deviation between the light beam and the track exceeds a predetermined value, and the recording stop means 404 issues a recording stop command to the signal recording means 403. To stop the recording operation of the information on the record carrier to prevent the data destruction of the adjacent track.

[0006]

When a track jump occurs during recording, information recorded on an adjacent track is destroyed. Therefore, the track jump is detected and recording is stopped to prevent the information on the adjacent track from being destroyed. There is a need. However, due to scratches, dirt on the record carrier, noise superimposed on the output signal of the track shift detecting means, and the like, there may be a case where the track jump is erroneously detected without actually causing the track jump. If the data to be recorded does not have real-time properties, such as when copying data stored in a hard disk device to an optical disk device, even if a track jump is erroneously detected, it is sufficient to perform recording again by retry processing. When data to be recorded is continuous and has real-time characteristics, for example, when image data is recorded in real time, if retry of recording is repeated due to erroneous detection of track skipping, recording cannot be performed in time and data recording is interrupted. In that case,
There is a problem that the image is stopped or disturbed on the way, and in the worst case, the recorded data becomes completely unusable.

An object of the present invention is to solve the above-mentioned problems and to provide an optical disk device capable of performing a stable recording operation.

[0008]

An optical disk apparatus according to the present invention comprises: a track shift detecting means for detecting a positional shift between a track on a record carrier having a track for recording a signal and a light beam; First and second track jump detecting means for detecting that the positional deviation exceeds a predetermined value, signal recording means for recording a signal on a record carrier, and first or second track jumping means depending on the operation state of the apparatus. Recording stop means for judging that one of the outputs of the track jump detecting means has reached a predetermined state and stopping the recording operation of the signal recording means, wherein the response of the first track jump detecting means is the second. And the detection accuracy of the second track jump detection means is higher than the detection accuracy of the first track jump detection means. It is obtained by the.

According to the present invention, in the case of ordinary data recording that does not require real-time processing, track jump is detected at high speed by using the output of the first track jump detecting means having a fast response, and the adjacent track is detected. When the data to be recorded is continuous and real-time (for example, when image data is recorded in real time, etc.), the second detection with high detection accuracy can be performed. By using the output of the track jump detecting means 2, the track jump can be detected without being affected by scratches, dirt on the record carrier, noise superimposed on the signal of the track shift detecting means, and the like. Do not interrupt the data recording due to re-recording in the middle, and do not stop or disturb the image in the middle. It has the effect of enabling a stable recording operation without impairing the real-time data without that.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a track shift detecting means for detecting a position shift between a track on a record carrier having a track for recording a signal and a light beam, First and second track jump detecting means for detecting that the track position deviation exceeds a predetermined value, signal recording means for recording a signal on a record carrier, and first and second track jump detecting means for recording a signal on a record carrier. Alternatively, there is provided a recording stop means for judging that one of the outputs of the second track jump detecting means has reached a predetermined state and stopping the recording operation of the signal recording means. Is faster than the response of the second track jump detecting means, and the detection accuracy of the second track jump detecting means is higher than the detecting accuracy of the first track jump detecting means. In the case of normal data recording that does not require real-time processing, the output of the first track jump detection means, which has a fast response, is used to detect track jumps at high speed and prevent adjacent tracks from being destroyed. The second track jump detection has high detection accuracy even when the data to be recorded is continuous and real-time, for example, when image data is recorded in real time, etc. By using the output of the means, a track jump can be detected without being affected by scratches, dirt on the record carrier, noise superimposed on the signal of the track deviation detecting means, etc., and the recording is performed halfway by re-recording due to erroneous detection. Data recording is not interrupted in time, and stable recording operation is performed without losing the real-time property of recorded data. It has the effect of obtaining.

According to a second aspect of the present invention, in the optical disk device according to the first aspect, the second track jump detecting means sets a detection level for detecting a track shift by the first track jump detecting means. In the case of normal data recording that does not require real-time processing, the output of the first track jump detecting means having a fast response is used to set a track jump. High-speed detection to prevent the destruction of adjacent tracks and perform a reliable and safe recording operation. Also, when the data to be recorded is continuous and real-time, such as when recording image data in real time, etc. Also, by using the output of the second track jump detecting means having high detection accuracy, scratches, stains, Without being affected by noise or the like superimposed on a rack displacement detector signal, etc. can be detected track skipping,
There is an effect that a stable recording operation can be performed without losing data recording in the middle due to re-recording due to erroneous detection and without interrupting data recording, and without deteriorating the real-time property of recorded data.

According to a third aspect of the present invention, in the optical disk device according to the first aspect, there is provided an address detecting means for reading address information indicating a scanning position of a light beam provided on a record carrier, and The track jump detecting means detects a track jump when the output of the track deviation detecting means exceeds a predetermined level, and the address read by the address detecting means by the second track jump detecting means becomes discontinuous. In the case of normal data recording that does not require real-time processing, the output of the first track jump detecting means having a fast response is used to detect a track jump. To prevent destruction of adjacent tracks and perform highly reliable and safe recording operation.
Also, when the data to be recorded is continuous and has real-time characteristics, for example, when recording image data or the like in real time, the output of the second track jump detecting means having high detection accuracy can be used. Track jumps can be detected without being affected by noise or the like superimposed on signals such as dirt and track deviation detection means, and recording is not completed in the middle due to re-recording due to erroneous detection, and data recording is not interrupted. This has the effect that a stable recording operation can be performed without impairing the real-time property of the recorded data.

According to a fourth aspect of the present invention, in the optical disk device according to the first aspect, a track for recording a signal on a record carrier is meandering at a substantially constant period, and the scanning position of the light beam is adjusted. Wobble detecting means for detecting the meandering amount of the track at the first track jump, the first track jump detecting means detecting a track jump when the output of the track deviation detecting means exceeds a predetermined level, and the second track jump The detection means detects a track jump when the output signal of the wobble detection means becomes discontinuous. In the case of ordinary data recording that does not require real-time processing, the first response has a fast response.
By using the output of the track jump detecting means, the track jump can be detected at a high speed and the adjacent track can be prevented from being destroyed, and a highly reliable and safe recording operation can be performed. In such a case, for example, even when image data is recorded in real time, the output of the second track jump detecting means having high detection accuracy is used to superimpose on a signal, such as a flaw, dirt, or track shift detecting means on the record carrier. Track jumps can be detected without being affected by noise, etc., recording cannot be completed in the middle due to re-recording due to erroneous detection, data recording will not be interrupted, and stable recording without impairing the real-time performance of recorded data It has the effect that the operation can be performed.

According to a fifth aspect of the present invention, in the optical disk device according to the first to fourth aspects, the signal is output by either of the first or second track jump detecting means in response to a command from outside the device. It is characterized by switching whether the recording operation of the recording means is stopped or not. In the case of normal data recording that does not require real-time processing, the output of the first track jump detection means having a fast response is used. Track skipping is detected at high speed to prevent adjacent tracks from being destroyed, and a highly reliable and safe recording operation can be performed. When data to be recorded is continuous and has real-time characteristics, for example, image data is recorded in real time In such cases as well, by using the output of the second track jump detecting means having high detection accuracy, scratches, stains, Without being affected by noise or the like superimposed on a rack displacement detector signal, etc. can be detected track skipping,
There is an effect that a stable recording operation can be performed without losing data recording in the middle due to re-recording due to erroneous detection and without interrupting data recording, and without deteriorating the real-time property of recorded data.

According to a sixth aspect of the present invention, in the optical disk device according to the first to fourth aspects, information is recorded on and reproduced from a plurality of types of record carriers. And switching between which of the first and second track jump detecting means the recording operation of the signal recording means is stopped in accordance with the result of the discrimination by the record carrier discriminating means. Yes, in the case of normal data recording that does not require real-time processing, the output of the first track jump detecting means, which has a fast response, is used to detect a track jump at a high speed and prevent adjacent tracks from being destroyed, thereby improving reliability. When the data to be recorded is continuous and real-time, for example, when recording image data in real time And the like, by using the output of the second track jump detecting means having high detection accuracy, the track jump can be detected without being affected by scratches, dirt on the record carrier, noise superimposed on the signal of the track shift detecting means, and the like. It is possible to perform recording stably without losing data recording in the middle due to re-recording due to erroneous detection and without interrupting data recording, and without deteriorating the real-time property of recorded data.

According to a seventh aspect of the present invention, in the optical disk device according to the first to fourth aspects, a buffer memory for temporarily storing information for recording a signal on a record carrier is provided. In response to the output of the first or second track jump detecting means, the recording operation of the signal recording means is stopped. In this case, the output of the first track jump detecting means having a fast response is used to detect the track jump at a high speed, prevent the adjacent track from being destroyed, and perform a highly reliable and safe recording operation. Even when data is continuous and has real-time characteristics, for example, when image data is recorded in real time, the buffer memory When the capacity is large, the output of the first track jump detecting means having a fast response is used to detect a track jump at a high speed and prevent destruction of an adjacent track to perform a reliable and safe recording operation. If the free space of the memory is small, the second
By using the output of the track jump detection means of
Track jumps can be detected without being affected by scratches, dirt on the record carrier, noise superimposed on the track shift detecting means signal, etc., and recording cannot be completed in the middle due to re-recording due to erroneous detection, and data recording is interrupted. This has the effect that a stable recording operation can be performed without impairing the real-time property of the recorded data without being lost.

An embodiment of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram showing an optical disk apparatus according to Embodiment 1 of the present invention. In FIG. 1, 101 is a record carrier having a track for recording a signal, 102 is an optical head that irradiates a light beam onto the record carrier 101, 103 is a signal recording unit that records a signal on the record carrier 101, and 105 is a signal recording unit. A spindle motor for rotating the record carrier 101; a motor control means 106 for controlling the spindle motor 105 to rotate at a predetermined number of revolutions; a moving means 107 for moving the light beam in the track width direction; Track deviation detecting means for detecting a positional deviation between the track and the light beam,
Reference numeral 09 denotes a tracking control unit that drives the moving unit 107 in accordance with a signal from the track deviation detection unit 108 to control the light beam to be positioned on the track.
Reference numeral 11 denotes a first track jump detecting means and a second track jump detecting means for detecting that the positional deviation between the light beam and the track exceeds a predetermined value, and 112 temporarily stores the recording data and sends it to the signal recording means. A buffer memory for sequentially sending recording data; 113, a storage capacity calculating means for calculating the capacity of the recording data stored in the buffer memory based on the difference between the write address and the read address of the buffer memory 112; A command interface 115 for receiving the data; a record carrier discriminating means 115 for discriminating the type of the record carrier;
The first track jump detecting means 110 and the second track jump detecting means 110
The signal recording means 103 determines that one of the outputs of the track jump detecting means 111 has reached a predetermined state.
Recording stop means for stopping the recording operation. Also 1a
Denotes recording data sent from outside the apparatus, 1b and 1c denote write and read addresses of the buffer memory 112, and 1d denotes an external command from outside the apparatus.

The operation of the thus configured optical disk device according to the first embodiment of the present invention will be described.

The record carrier 101 has a spindle motor 10 controlled at a predetermined rotation speed by a motor control means 106.
Rotate by 5. A track on the record carrier 101 is irradiated with a light beam from the optical head 102,
1 is detected by the track shift detecting means 108, and the track shift detecting means 1
In response to the output of 08, the tracking control means 109 drives the moving means 107 so that the light beam is positioned on the track. The information is recorded while the recording data 1a is temporarily stored in the buffer memory 112 while the signal recording means 1
03 and the record carrier 101 via the optical head 102
This is done by irradiating the upper track. When continuous data is recorded in real time, data must be read from the buffer memory 112 and recorded on the record carrier 101 so that the recording data 1a sent from the outside of the apparatus is not interrupted. Reading of data from buffer memory 112 and record carrier 10
If the recording to 1 is delayed and the buffer memory 112 is full, the recording data 1a cannot be transferred to the buffer memory 112, and the continuous data recording fails.

The capacity of the recording data stored in the buffer memory 112 is calculated by the storage capacity calculating means 113 from the difference between the write address 1b and the read address 1c of the buffer memory 112.

The type of the record carrier 101 is determined by the record carrier determining means 115. The method of discrimination is, for example, whether the record carrier 101 is stored in a cartridge case or remains naked, the difference in the reflectance of the record carrier 101, the difference in the signal amplitude of the track shift detecting means 108, or the difference in the record carrier 101. The type of the record carrier 101 is identified by the identification information or the like recorded in advance on the above.

Now, while recording information on the record carrier 101,
Vibration or shock may be applied to the device from the outside,
If there is a large scratch or the like in 1, the light beam may cause a track jump. In that case, the first track jump detecting means 110 and the second track jump detecting means 111 detect from the output of the track shift detecting means 108 that the positional shift between the light beam and the track exceeds a predetermined value.

Here, the first track jump detecting means 110 is provided with a track shift detecting means so that the track jump detecting time of the first track jump detecting means 110 is sufficiently short so that information recorded on an adjacent track is not destroyed. A determination level for detecting a track jump is determined from the output of.

The second track jump detecting means 11
The determination level for detecting a track jump from the output of the track shift detecting means 108 is set so that the track jump 1 can be detected without being affected by scratches, dirt on the record carrier, noise superimposed on the signal of the track shift detecting means, or the like. It is set higher than the determination level of the first track jump detection means 110.

The recording stopping means 104 is a storage capacity calculating means 1
13, the output of the command interface 114,
Based on at least one of the outputs of the record carrier discriminating means 115, one of the outputs of the first track jump detecting means 110 and the second track jump detecting means 111 is selected, and it is determined that this is in a predetermined state. Then, a recording stop command for stopping the recording operation of the signal recording unit 103 is issued, and the signal recording unit 103 stops the recording operation of the information on the record carrier 101 to prevent the data destruction of the adjacent track.

Here, the recording stop means 104 is connected to the first track jump detecting means 110 and the second
The output of the track jump detecting means 111 is selected.

When the storage capacity of the buffer memory 112 calculated by the storage capacity calculation means 113 is smaller than a predetermined value, even if the track jump is erroneously detected and the recording operation is performed again, the recording data 1a sent during the recording operation is stored in the buffer memory. Since the data is stored in the storage 112, the data can be recorded on the record carrier 101 without interruption of the recording data 1 a. Therefore,
Even if a track jump is erroneously detected, the recording operation is not interrupted. Therefore, the output of the first track jump detecting means 110 that can more reliably prevent the data destruction of the adjacent track due to the track jump is selected. Conversely, storage capacity calculating means 11
When the storage capacity of the buffer memory 112 calculated in step 3 is larger than a predetermined value, when the recording operation is restarted by erroneously detecting a track jump, the recording data 1a sent during that time exceeds the free capacity of the buffer memory 112. Therefore, data recording is interrupted on the way. Therefore, in this case, if the track jump is erroneously detected, the recording operation itself will fail. Therefore, the output of the second track jump detecting unit 111 having a low erroneous detection frequency is selected.

Alternatively, an instruction is received from the outside of the apparatus via the command interface 114 as to whether the recording data does not need real-time data or is real-time continuous data. Even if a track jump is erroneously detected, the recording may be restarted from the place where the track jump occurred by retry processing. Therefore, the output of the first track jump detecting means 110 which can more reliably prevent the data destruction of the adjacent track due to the track jump can be prevented. In the case of selected and real-time continuous data, if the track jump is erroneously detected, the recording operation itself may end in failure. Therefore, the output of the second track jump detecting means 111 having a low erroneous detection frequency is selected.

Alternatively, in the case of the record carrier 101 which records continuous data such as an image in real time based on the discrimination result of the record carrier discriminating means 115, if a track jump is erroneously detected, the recording operation itself may fail. The output of the second track jump detecting means 111 which has a low frequency of erroneous detection is selected. Otherwise, the output of the first track jump detecting means 110 which can more reliably prevent data destruction of an adjacent track due to a track jump is selected. I do.

The second track jump detecting means 1
When the recording operation is stopped by selecting the output of No. 11, the adjacent track may be slightly destroyed in some cases due to the slow detection speed. However, as is well known, continuous data such as audio and images may be slightly destroyed. If so, the portion destroyed during reproduction can be restored to a level having no practical problem by interpolation processing or the like.

As described above, the output of the first track jump detecting means 110 which responds quickly according to the storage capacity of the buffer memory 112, a command from outside the apparatus, or the type of the record carrier 101, and the scratches and stains on the record carrier In order to select one of the outputs of the second track jump detecting means 111 which is not affected by noise or the like superimposed on the signal of the track shift detecting means, and to stop the recording operation, the normal data which does not need the real-time property is selected. In the case of recording, track skipping is detected at high speed to prevent the destruction of adjacent tracks, and a reliable and safe recording operation can be performed.If the data to be recorded is continuous and has real-time characteristics, for example, image data etc. Even when recording in real time, etc., scratches and dirt on the record carrier, noise superimposed on the signal of the track shift detecting means, etc. Track jumps are detected without being affected, and recording is not completed in the middle due to re-recording due to erroneous detection, and data recording is not interrupted.Images do not stop halfway or images are disturbed. In addition, a stable recording operation can be performed without impairing the real-time property of the recording data.

(Embodiment 2) FIG. 2 is a block diagram showing an optical disk apparatus according to Embodiment 2 of the present invention. 2, reference numeral 201 denotes a record carrier having a track for recording a signal, 202 denotes an optical head that irradiates a light beam onto the record carrier 201, 203 denotes a signal recording unit that records a signal on the record carrier 201, and 205 denotes a signal recording unit. A spindle motor for rotating the record carrier 201; a motor control means 206 for controlling the spindle motor 205 to rotate at a predetermined number of revolutions; a moving means 207 for moving the light beam in the track width direction; Track deviation detecting means for detecting a positional deviation between a track and a light beam;
Reference numeral 9 denotes tracking control means for driving the moving means 207 in accordance with a signal from the track shift detecting means 208 so that the light beam is positioned on the track. Reference numeral 216 denotes a scanning position of the light beam provided on the record carrier 201. Is a first track jump detecting means for detecting that the positional deviation between the light beam and the track exceeds a predetermined value, and 211 is an address detecting means for detecting that the output of the address detecting means 216 is discontinuous. A second track jump detecting means 212 for detecting the presence of the buffer temporarily stores the recording data, and a buffer memory for sequentially transmitting the recording data to the signal recording means 203. A second memory 213 detects the difference between the write address and the read address of the buffer memory 212. Storage capacity calculation for calculating the capacity of recording data stored in the buffer memory 212 Stage, the command interface 214 to receive command instructions from outside the device, record carrier discriminating means for discriminating the type of the record carrier 201 is 215, 2
Reference numeral 04 denotes an output of one of the first track jump detecting means 210 and the second tracking detecting means 211 in a predetermined state based on the output of the storage capacity calculating means 213, the output of the command interface 214, and the output of the record carrier discriminating means 215. This is a recording stop unit for determining that the recording operation has been stopped and stopping the recording operation of the signal recording unit 203. Reference numeral 2a denotes recording data sent from outside the apparatus, 2b and 2c denote write and read addresses of the buffer memory 212, and 2d denotes an external command from outside the apparatus.

The operation of the thus configured optical disk device of the second embodiment will be described.

The record carrier 201 has a spindle motor 20 controlled at a predetermined rotation speed by a motor control means 206.
Rotate by 5. From the optical head 202 to the record carrier 201
The upper track is irradiated with a light beam, and the position shift between the track on the record carrier 201 and the light beam is detected by the track shift detecting means 208.
The tracking control means 209 drives the moving means 207 so that the light beam is positioned on the track in response to the output of the moving means 207.

In recording information, the recording data 2a is sent to the signal recording means 203 sequentially while the recording data 2a is temporarily stored in the buffer memory 212.
This is performed by irradiating the upper track. When continuous data is recorded in real time, data must be read from the buffer memory 212 and recorded on the record carrier 201 so that the recording data 2a sent from the outside of the apparatus is not interrupted. Read data from buffer memory 212 and record carrier 2
When the recording to 01 is delayed and the buffer memory 212 becomes full, the recording data 2a is interrupted, and the recording of the continuous data fails.

The capacity of the recording data stored in the buffer memory 212 is calculated by the storage capacity calculating means 213 from the difference between the write address 2b and the read address 2c of the buffer memory 212.

The type of the record carrier is determined by the record carrier discriminating means 211.
Is determined. The discrimination method is, for example, the record carrier 2
01 is stored in the cartridge case or remains naked, or the difference in the reflectance of the record carrier 201, or the difference in the signal amplitude of the track shift detecting means 208,
Alternatively, the type of the record carrier 201 is identified by identification information or the like recorded in advance on the record carrier 201.

Now, while recording information on the record carrier 201,
Vibration or impact may be applied to the device from the outside,
If there is a large scratch or the like in 1, the light beam may cause a track jump. In that case, the first track jump detecting means 210
When the positional deviation between the light beam and the track exceeds a predetermined value from the output of 8, the track jump is detected. Also the second
Track jump detecting means 211 monitors the address information read by the address detecting means 216, and detects a track jump when the address information becomes discontinuous.

Here, the first track jump detecting means 210 is provided with a track shift detecting means 208 so that the track jump detecting time of the first track jump detecting means is sufficiently short so that information recorded on an adjacent track is not destroyed. A determination level for detecting a track jump is determined from the output of.

The second track jump detecting means 21
No. 1 detects a track jump by monitoring the address read by the address detection means 216,
Generally, the address information is a CRC (Cyclic Redundancy Chec).
Since k) is attached, an incorrect address is not detected. Therefore, track jump can be detected without being affected by scratches, dirt on the record carrier, noise superimposed on the signal of the track shift detecting means, and the like. Note that the address becomes discontinuous when the light beam completely moves on the adjacent track, so that the detection speed is lower than that of the first track jump detecting means 210.

The recording stopping means 204 is a storage capacity calculating means 2
13, the output of the command interface 214,
At least one of the outputs of the record carrier discriminating means 215 selects one of the outputs of the first track jump detecting means 210 and the second tracking detecting means 211,
When this is determined to be in a predetermined state, a recording stop command for stopping the recording operation of the signal recording unit 203 is issued, the signal recording unit 203 stops the recording operation of the information on the record carrier 201, and the data of the adjacent track is recorded. Prevent destruction.

Here, the recording stop means 204 selects the output of the first track jump detecting means 210 and the output of the second track jump detecting means 211, for example, as follows.

When the storage capacity of the buffer memory 212 calculated by the storage capacity calculation means 213 is smaller than a predetermined value, even if a track jump is erroneously detected and the recording operation is performed again, the recording data 2a sent during that time is stored in the buffer memory. Since the data is stored in the storage 212, the data can be recorded on the record carrier 201 without interruption of the recording data 2 a. Therefore,
Even if a track jump is erroneously detected, the recording operation is not interrupted. Therefore, the output of the first track jump detecting means 210 which can more reliably prevent data destruction of an adjacent track due to the track jump is selected. Conversely, the storage capacity calculating means 21
If the storage capacity of the buffer memory 212 calculated in step 3 is larger than a predetermined value, if the track skip is erroneously detected and the recording operation is restarted, the recording data 2a sent during that time exceeds the free capacity of the buffer memory 212. Therefore, data recording is interrupted on the way.

Therefore, in this case, if a track jump is erroneously detected, the recording operation itself will fail.
The output of the second track jump detecting means 211 having a low erroneous detection frequency is selected.

Alternatively, a command is received from the outside of the apparatus via the command interface 214 as to whether the recording data does not require real-time data or is real-time continuous data. Even if a track jump is erroneously detected, the recording may be resumed by the retry process from the place where the track jump occurred, so that the output of the first track jump detecting means 210 can more reliably prevent the data destruction of the adjacent track due to the track jump. In the case of real-time continuous data, if the track jump is erroneously detected, the recording operation itself may end in failure.
Select the output of

Alternatively, in the case of the record carrier 201 which records continuous data such as an image in real time according to the discrimination result of the record carrier discriminating means 215, the erroneous detection of a track jump may cause the recording operation itself to fail. The output of the second track jump detecting means 211 which has a low frequency of erroneous detection is selected, and otherwise, the output of the first track jump detecting means 210 which can more reliably prevent data destruction of an adjacent track due to a track jump is selected. I do.

As described in the first embodiment, when the output of the second track jump detecting means 211 is selected and the recording operation is stopped, the detection speed is slow. Although the data may be destroyed, if the data is continuous data such as audio and video, if the data is slightly destroyed, the portion destroyed during reproduction can be restored to a level having no practical problem by interpolation processing or the like.

As described above, depending on the storage capacity of the buffer memory 212, a command from the outside of the apparatus, or the type of the record carrier 201, the output of the first track jump detecting means 210 which responds quickly and the scratches and stains on the record carrier Since any one of the outputs of the second track jump detecting means 211 which is not affected by noise or the like superimposed on the signal of the track deviation detecting means is selected and the recording operation is stopped, the normal data recording which does not need the real-time property is performed. In the case of, track jump is detected at high speed and the adjacent track is prevented from being destroyed, and reliable and safe recording operation can be performed. In the case of recording on a recording medium, the noise and the like superimposed on the signal, Track jumps are detected without being affected, and recording is not completed in the middle due to re-recording due to erroneous detection, data recording is not interrupted, and images are not stopped or images are disturbed. In addition, a stable recording operation can be performed without impairing the real-time property of the recording data.

(Embodiment 3) FIG. 3 is a configuration diagram of an optical disk apparatus according to Embodiment 3 of the present invention. In FIG. 3, reference numeral 301 denotes a record carrier on which a track for recording a signal is meandering at a substantially constant cycle, and 302 denotes a record carrier.
1, an optical head for irradiating a light beam, 303 a signal recording means for recording a signal on the record carrier 301, 305 a spindle motor for rotating the record carrier 301, and 306 so that the spindle motor 305 rotates at a predetermined number of revolutions. Motor control means for controlling; 307, a moving means for moving the light beam in the track width direction; 308, a track shift detecting means for detecting a positional shift between the track and the light beam on the record carrier 301; Tracking control means for driving the moving means 307 in accordance with the signal of (3) so that the light beam is positioned on the track;
16 is a wobble detecting means for detecting the amount of track meandering at the scanning position of the light beam, 310 is a first track jump detecting means for detecting that the positional deviation between the light beam and the track exceeds a predetermined value, 311 is Wobble detecting means 31
6, a second track jump detecting means for measuring an output cycle and detecting a track jump based on a change in the cycle.
Numeral 312 temporarily stores the recording data,
A buffer memory 313 for sequentially sending print data to the memory 3, a storage capacity calculator 313 for calculating the capacity of print data stored in the buffer memory 312 based on a difference between a write address and a read address of the buffer memory 312, A command interface 315 for receiving a command instruction is a record carrier discriminating means for discriminating the type of the record carrier 301, and 304 is a first command based on an output of the storage capacity calculating means 313, an output of the command interface 314, and an output of the record carrier discriminating means 315. Track jump detecting means 310 and second tracking detecting means 311
Is a recording stop means for judging that one of the outputs has reached a predetermined state and stopping the recording operation of the signal recording means 303. 3a is recording data sent from outside the device,
3b and 3c are write and read addresses of the buffer memory 312, respectively, and 3d is an external command from outside the device.

The operation of the thus configured optical disc device according to the third embodiment of the present invention will be described below.

The record carrier 301 holds the spindle motor 30 controlled at a predetermined rotation speed by the motor control means 306.
Rotate by 5. The track of the record carrier 301 is meandering at a substantially constant frequency which is FM-modulated in order to embed address information. For example, a CD-R or a DVD-R
W, DVD-RAM, DVD-R, DVD-RW disk and the like. The optical head 302 irradiates the track on the record carrier 301 with a light beam, and the positional displacement between the track on the record carrier 301 and the light beam is detected by the track displacement detecting means 30.
8, the tracking control means 309 drives the moving means 307 so that the light beam is positioned on the track in response to the output of the track shift detecting means 308.

The recording of information is sequentially sent to the signal recording means 303 while the recording data 2 a is temporarily stored in the buffer memory 312, and is recorded via the optical head 302.
This is performed by irradiating the upper track. When continuous data is recorded in real time, data must be read from the buffer memory 312 and recorded on the record carrier 301 so that the recording data 2a sent from the outside of the apparatus is not interrupted. Read data from buffer memory 312 and record carrier 3
When recording to 01 is delayed and the buffer memory 312 becomes full, the recording data 2a is interrupted, and continuous data recording fails.

The capacity of the recording data stored in the buffer memory 312 is calculated by the storage capacity calculating means 313 from the difference between the write address 2b and the read address 2c of the buffer memory 312.

The type of the record carrier 301 is determined by the record carrier determining means 311. The method of discrimination is, for example, whether the record carrier 301 is stored in the cartridge case or remains naked, the difference in the reflectance of the record carrier 301, the difference in the signal amplitude of the track shift detecting means 308, or the difference in the record carrier 301. The type of the record carrier 301 is identified on the basis of the identification information or the like recorded in advance.

Now, while recording information on the record carrier 301,
Vibration or shock may be applied to the device from outside, or the record carrier 30
If there is a large scratch or the like in 1, the light beam may cause a track jump. In that case, the first track jump detecting means 310
When the positional deviation between the light beam and the track exceeds a predetermined value from the output of 8, the track jump is detected. Also the second
The track jump detecting means 311 detects the wobble amount in which the track on the record carrier 301 is meandering at a substantially constant cycle by the wobble detecting means 316.
The output signal of No. 6 is binarized, its cycle is measured, and a track jump is detected when the cycle is out of a predetermined range.

Here, the track jump detection time of the first track jump detection means 310 is set to be sufficiently short so that the information recorded on the adjacent track is not destroyed.
The first track jump detection means 310 determines a determination level for detecting a track jump from the output of the track deviation detection means 308.

The second track jump detecting means 31
Reference numeral 1 indicates that the track meandering amount detected by the wobble detecting unit 316 is binarized and the track is detected using the period information. Even if there is noise or the like, since the signal cycle does not change only by the output amplitude of the wobble detecting means 316, track jump can be detected without erroneous detection. Since the output of the wobble detecting means 316 becomes discontinuous and the period changes when the light beam completely moves on the adjacent track, the detection speed is lower than that of the first track jump detecting means 310.

The recording stop means 304 is the storage capacity calculating means 3
13, the output of the command interface 314,
One of the outputs of the first track jump detecting means 310 and the second tracking detecting means 311 is selected by at least one of the outputs of the record carrier discriminating means 315,
When this is determined to be in a predetermined state, a recording stop command for stopping the recording operation of the signal recording unit 303 is issued, and the signal recording unit 303 stops the recording operation of the information on the record carrier 301, and the data of the adjacent track is recorded. Prevent destruction.

Here, the recording stopping means 304 selects the output of the first track jump detecting means 310 and the output of the second track jump detecting means 311 as follows, for example.

When the storage capacity of the buffer memory 312 calculated by the storage capacity calculation means 313 is smaller than a predetermined value, even if a track jump is erroneously detected and the recording operation is restarted, the recording data 3a sent during that time is stored in the buffer memory. Since the data is stored in the record carrier 312, the data can be recorded on the record carrier 301 without interruption of the record data 3a. Therefore,
Even if a track jump is erroneously detected, the recording operation is not interrupted. Therefore, the output of the first track jump detecting means 310 that can more reliably prevent data destruction of an adjacent track due to the track jump is selected. Conversely, the storage capacity calculating means 31
When the storage capacity of the buffer memory 312 calculated in step 3 is larger than a predetermined value, when the recording operation is restarted by erroneously detecting a track skip, the recording data 3a sent during that time exceeds the free capacity of the buffer memory 312. Therefore, data recording is interrupted on the way. Therefore, in this case, if the track jump is erroneously detected, the recording operation itself will fail. Therefore, the output of the second track jump detecting means 311 having a low erroneous detection frequency is selected.

Alternatively, an instruction is received from the outside of the apparatus via the command interface 314 as to whether the recording data does not need real-time data or is real-time continuous data. Even if a track jump is erroneously detected, the recording may be resumed by a retry process from the place where the track jump occurred, so that the output of the first track jump detecting means 310 can more reliably prevent data destruction of an adjacent track due to the track jump. And in the case of real-time continuous data, if the track jump is erroneously detected, the recording operation itself may end in failure.
Select the output of Alternatively, the record carrier discriminating means 315
According to the determination result, in the case of the record carrier 301 which records continuous data such as images in real time, if the track jump is erroneously detected, the recording operation itself may end in failure. The output of the jump detecting means 311 is selected, and if not, the output of the first track jump detecting means 310 which can more reliably prevent data destruction of an adjacent track due to a track jump is selected.

In the above embodiment, the track jump is detected by the second track jump detecting means 311 by measuring the period of the output signal of the wobble detecting means 316. Track jump may be detected by detecting that the phase of the track changes.

The second track jump detecting means 3
When the recording operation is stopped by selecting the output of No. 11, the adjacent track may be slightly destroyed in some cases because the detection speed is low. The broken portion can be restored to a level having no practical problem by interpolation processing or the like.

As described above, according to the storage capacity of the buffer memory 312, a command from the outside of the apparatus, or the output of the first track jump detecting means 310, which responds quickly depending on the type of the record carrier 301, ,
Since the recording operation is stopped by selecting one of the outputs of the second track jump detecting means 311 which is not affected by the noise or the like superimposed on the signal of the stain, the track shift detecting means 308 or the like, the real-time property is not required. In the case of normal data recording, track skipping is detected at high speed to prevent destruction of an adjacent track and a highly reliable and safe recording operation can be performed. Even when image data is recorded in real time, track jumps are detected without being affected by scratches, dirt on the record carrier 301, noise superimposed on the signal of the track deviation detecting means, etc., and recording is repeated due to erroneous detection. As a result, the data recording is not interrupted due to the recording being delayed, and the image stops Stable recording operation can be performed without impairing the real-time recording data without that such be.

[0066]

As described above, according to the present invention, in the case of ordinary data recording that does not require real-time processing, the output of the first track jump detecting means having a high response speed is used to speed up the track jump. Detects and prevents the destruction of adjacent tracks, performs a safe recording operation, and has a high detection accuracy even when the data to be recorded is continuous and real-time, for example, when image data is recorded in real time. By using the output of the track jump detecting means 2, the track jump can be detected without being affected by scratches, dirt on the record carrier, noise superimposed on the signal of the track shift detecting means, etc., and the recording is retried due to erroneous detection. As a result, the data cannot be recorded in time and the data recording is not interrupted. It is possible to obtain an excellent effect of enabling a stable recording operation without that such.

[Brief description of the drawings]

FIG. 1 is a block diagram of an optical disk device according to a first embodiment of the present invention;

FIG. 2 is a block diagram of the optical disc device according to the second embodiment;

FIG. 3 is a block diagram of the optical disc device according to the second embodiment;

FIG. 4 is a block diagram of a conventional optical disk device.

[Explanation of symbols]

1a, 2a, 3a Recorded data 1b, 2b, 3b Write address 1c, 2c, 3c Read address 1d, 2d, 3d External command 101, 201, 301 Record carrier 102, 202, 302 Optical head 103, 203, 303 Signal recording means 104, 204, 304 Recording stop means 105, 205, 305 Spindle motor 106, 206, 306 Motor control means 107, 207, 307 Moving means 108, 208, 308 Track shift detecting means 109, 209, 309 Tracking control means 110, 210 , 310 first track jump detecting means 111, 211, 311 second track jump detecting means 112, 212, 312 buffer memory 113, 213, 313 storage capacity calculating means 114, 214, 314 command Centers face 115,215,315 record carrier determination unit 216 address detecting means 316 wobble detecting means

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroyuki Yamaguchi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5D118 AA13 BA01 BF02 BF03 CA13 CC12 CD03 CD07 CD15

Claims (7)

[Claims] 1. A track shift detecting means for detecting a positional shift between a track on a record carrier having a track for recording a signal and a light beam, and detecting that the positional shift between the light beam and the track exceeds a predetermined value. First and second track jump detecting means for detecting, a signal recording means for recording a signal on a record carrier, and an output of either the first or second track jump detecting means depending on the operation state of the apparatus. Recording stop means for determining that a predetermined state has been reached and stopping the recording operation of the signal recording means, wherein the response of the first track jump detection means is faster than the response of the second track jump detection means, An optical disc device characterized in that the detection accuracy of the second track jump detection means is higher than the detection accuracy of the first track jump detection means. 2. The apparatus according to claim 1, wherein the detection level at which the second track jump detecting means detects a track shift is set higher than the detection level at which the first track jump detecting means detects a track shift. Optical disk device. 3. An apparatus according to claim 1, further comprising: address detection means for reading address information indicating a scanning position of the light beam provided on the record carrier, wherein the first track jump detection means has an output of the track deviation detection means exceeding a predetermined level. 2. The optical disk apparatus according to claim 1, wherein a track jump is detected by the detecting means, and the track jump is detected when the address read by the second track jump detecting means becomes discontinuous. 4. A wobble detecting means for detecting a track meandering amount at a scanning position of a light beam, wherein a track for recording a signal on a record carrier meanders at a substantially constant cycle. The track jump detecting means detects the track jump when the output of the track deviation detecting means exceeds a predetermined level, and the second track jump detecting means detects the track jump by the discontinuity of the output signal of the wobble detecting means. 2. The optical disk device according to claim 1, wherein the optical disk device detects an error. 5. A recording apparatus according to claim 1, wherein a command from the outside of the apparatus switches between the output of the first and second track jump detecting means to stop the recording operation of the signal recording means. Optical disk device. 6. An optical disc apparatus for recording and reproducing information on and from a plurality of record carriers, comprising: record carrier discriminating means for discriminating the type of record carrier; 5. A method according to claim 1, wherein the output of said track jump detecting means is adapted to stop the recording operation of said signal recording means.
An optical disk device as described in the above. 7. A buffer memory for temporarily storing information for recording a signal on a record carrier, wherein the output of either the first or second track jump detecting means is used in accordance with the storage state of the buffer memory. The recording operation is stopped or switched.
5. The optical disk device according to 4.