JP2002319134A - Optical disk recording/reproducing device and recording timing control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To offer an optical disk recording/reproducing device, by which the accuracy of the linking position is secured even at the time of recording of a high-hold speed. SOLUTION: The device is provided with a laser control means 105 for controlling the light intensity of a laser beam in accordance with a recording signal, a reproduced signal processing means 106 for detecting a data reproducing signal from a reflected light, and a delay measuring means 108 for measuring the delay time Td between the recorded signal and the data reproducing signal, then the high accuracy of linking position is maintained even at the time of high speed recording by controlling the recording start timing in accordance with the delay time Td.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a CD-R, a CD-R,
The present invention relates to an optical disc recording / reproducing apparatus for recording / reproducing information on a recordable / reproducible optical disc such as RW and DVD.

[0002]

2. Description of the Related Art In recent years, a large-capacity DVD-R (Digital Versatile Disc-Rec) capable of recording a large amount of information as an external storage device of a computer or an information recording medium for video / audio recording.
ordable). This D
The VD-R is a write-once optical disc that can be recorded only once, and new data can be linked-recorded following an already recorded area in which data has already been recorded.

FIG. 7 shows a format of data recorded on a DVD-R. Tracks for recording data are spirally formed on the recording surface of the DVD-R, and data is recorded on the tracks in units of error correction (ECC) blocks. The ECC block 701 is composed of 16 sets of sectors 702.
It is composed of six sets of sync frames. A predetermined synchronization code is arranged at the beginning of each sync frame.

In such a data format,
Linking position 708 is the first sector 7 of the ECC block.
This is 256T after the end of the synchronization code 707 of the first sync frame 706 of FIG. If the recording start position at the linking position 708 shifts during linking recording, the phase at which the synchronization code is recorded changes from the linking position 708 as a boundary. If the area in which the linking recording has been performed with such a shift is continuously reproduced, it is not possible to detect a synchronization code necessary for demodulating data immediately after the linking position 708. As a result, data after the linking position cannot be detected. A playback error occurs. For this reason, high precision is required at the joint between the end point of the already recorded data and the start point of new data to be newly recorded at the time of linking recording.

Conventionally, in response to the above request, the end point of the already recorded data and the start point of the new data to be newly recorded coincide with each other from the detection position of the last synchronization code of the already recorded data. Recording of new data was started at regular intervals. FIG. 8 is a timing chart showing an example of the operation of the conventional recording method. The data reproduction signal 807 obtained when reproducing the recorded data 801 on the optical disk is delayed by a delay time Td from the time when the recorded data 801 is irradiated with the laser beam as a result of passing through the reproduction signal processing means. Therefore, recording is started after (256T−Td) after the last synchronization code 804 in the recorded data is detected from the data reproduction signal 807. In the conventional recording method, a fixed time (256T-256T) is calculated by using a reproduction clock obtained by reproducing recorded data or a recording clock generated based on information recorded in advance on an optical disk. T
The data recording was started in accordance with the recording signal 808 with the time when d) was counted as the linking position 805.

[0006]

However, since the above-mentioned delay time Td changes depending on the operating voltage and temperature of the optical disk recording / reproducing apparatus, if the above-mentioned conventional recording method changes by α as in the delay time 809, the delay time Td becomes smaller. The linking position is shifted by an amount corresponding to the
2). When the recording speed is low, the variation amount α of the signal propagation delay time 809 in the laser control means, the light detection means for the reflected light from the disc, and the reproduction signal processing means is equal to or less than the period of the reproduction clock or the recording clock. Therefore, even in the above-described conventional recording method, the accuracy of the linking position can be maintained at about one clock of the reproduction clock or the recording clock.

[0007] However, with the recent development of applications of consumer equipment from audio to video recording and the demand for high-speed computer peripherals, the recording speed of optical disk recording / reproducing apparatuses has been increasing. As the recording speed increases, the variation amount α of the signal propagation delay time 809 becomes many times larger than the period of the reproduction clock or the recording clock. Therefore, the accuracy of the linking position is reduced by one clock of the reproduction clock or the recording clock. It cannot be kept to the extent. As described above, the conventional recording method has a problem that the accuracy of the linking position deteriorates as the recording speed increases, and an error occurs during reproduction.

In view of the above situation, an object of the present invention is to propose an optical disk recording / reproducing apparatus capable of maintaining the accuracy of the linking position even when the recording speed is high.

[0009]

In order to solve the above-mentioned problems, an optical disk recording / reproducing apparatus according to the present invention comprises a laser light source for irradiating a laser beam to an optical disk, and a recording apparatus for generating a recording signal according to information to be recorded. Signal generation means, laser control means for controlling a laser light source in accordance with the recording signal, light detection means for receiving reflected light with respect to the laser beam applied to the optical disk and converting the reflected light into an electric signal, and a reproduction signal from the electric signal. Reproduction signal processing means for extracting the recording signal, delay measurement means for measuring a delay time between the recording signal and the reproduction signal, and recording timing control for controlling a timing at which the recording signal generation means starts outputting the recording signal. Means, the recording timing control means, the recording signal generating means according to the delay time measured by the delay measuring means, And controlling the timing to start outputting the serial recording signals.

The laser control means further comprises a bypass means for inputting a laser drive signal for controlling the laser light source to the reproduction signal processing means, wherein the bypass measurement means measures the delay by the delay measurement means. In the period, the laser drive signal is input to the reproduction signal processing means.

Further, there is further provided a voltage monitoring means for monitoring at least one operating voltage among the laser control means, the light detection means, and the reproduction signal processing means, and the delay measuring means comprises a voltage monitored by the voltage monitoring means. The delay measurement is performed when the value changes.

[0012] Further, there is further provided a temperature monitor for monitoring at least one of the laser control means, the light detection means, and the reproduction signal processing means, and the delay measurement means is provided for monitoring the temperature monitored by the temperature monitor means. The delay measurement is performed when the value changes.

Further, the delay measuring means performs delay measurement in an unrecorded area of the optical disc where no information is recorded.

Further, the laser control means controls the light intensity of the laser beam at a light intensity within a range where no information is recorded on the optical disk during the period when the delay measuring means is performing the delay measurement.

A recording timing control method according to the present invention is a recording timing control method for controlling a timing of starting to record information on an optical disk. The recording timing control method comprises the steps of: The recording timing is controlled based on the delay time between the reflected light and the reproduction signal obtained from the reflected light of the laser beam applied to the optical disk.

Further, it is preferable that an electric signal to be obtained with respect to a reflected light of a laser beam applied to an optical disk with a light intensity corresponding to the recording signal is generated from the recording signal, and a reproduction signal is obtained from the electric signal. Features.

Further, the delay time is measured when the power supply voltage of the optical disk recording / reproducing device changes.

The delay time is measured when the temperature of the optical disk recording / reproducing device changes.

The delay time is measured in an unrecorded area of the optical disc where no information is recorded.

Further, the light intensity of the laser beam changed according to the recording signal during the delay measurement is a light intensity in a range where no information is recorded on the optical disc.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk recording / reproducing apparatus according to the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 101 denotes a recordable optical disk (for example, DVD-R), and information on the optical disk 101 on which information is recorded is recorded in advance as a reference for a recording frequency. Reference numeral 102 denotes a motor for rotating the optical disk 101. 103 is a laser light source (not shown) for generating a laser beam such as a semiconductor laser,
Light converging means (not shown) for converging a laser beam on the recording surface of the optical disc 101; driving means (not shown) for driving the light converging means in the focusing direction and the tracking direction; The optical head includes a light detection unit (not shown) for receiving the reflected light and converting the reflected light into an electric signal.

A recording signal generating means 104 modulates user data 120 to be recorded according to a predetermined modulation method and outputs a recording signal 121. Reference numeral 105 denotes a laser control unit that controls the output of the laser light source in the optical head 103 according to the recording signal 121. Reference numeral 106 denotes a recording reference signal 1 based on the electric signal output from the light detecting means in the optical head 103.
22, a reproduction signal processing means for extracting the data reproduction signal 124; 107 is a recording clock generating means for generating a recording clock 123 from the recording reference signal 122. 10
Reference numeral 8 denotes a delay measuring unit that measures a delay time between the recording signal 121 and the data reproduction signal 124. An address reproducing unit 109 reproduces address information 126 from the data reproduction signal 124. Reference numeral 110 denotes synchronization information detecting means for detecting a synchronization code from the data reproduction signal 124. 11
Reference numeral 1 denotes a recording timing control unit that controls the timing at which the recording signal generation unit 104 starts outputting the recording signal 121. Reference numeral 112 denotes a CPU that controls the entire optical disk recording / reproducing apparatus.

Next, the related operation of each component will be described. The recording signal generation unit 104 configures an ECC block by adding address information and error correction information to user data to be recorded, and then sets a predetermined modulation method (for example, 8-16).
A recording signal 121 modulated by inserting a synchronization code for each sync frame according to the modulation method) is output from the timing when the recording start timing signal 128 becomes High.
The light intensity of the laser beam output from the laser light source of the optical head 103 is controlled by a laser control unit 105. The laser control unit 105 determines that the recording signal 121 is High.
In the section of h, the light intensity is increased so that a recording mark is formed on the optical disc 101, and in the section of Low, the light intensity is decreased so that a recording mark is not formed.

The reflected light of the laser beam radiated and converged from the optical head 103 from the optical disk 101 is received by a light detecting means constituted by a pin photodiode or the like, and is converted into an electric signal (current) corresponding to the amount of received light. . The light detecting means is divided so as to be able to detect each state of a convergence state (focus state) of a laser beam on the optical disk 101 and a track scanning state (tracking state). Each of the detected currents is input to the reproduction signal processing means 109, and is converted into a voltage amplitude signal. The reproduction signal processing means 109 then adds and subtracts each of the voltage signals according to the purpose, so that a focus shift signal for controlling a focus state, a tracking error signal,
Further, a recording reference signal 124 and a reproduction signal are obtained.

The focus shift signal and the tracking error signal obtained here are sent to the focus and tracking drive means of the optical head 103, and are controlled so as to be in an optimum focus and tracking state according to the respective shift amounts. You. Also, the obtained playback signal is
The signal passes through amplifying means for amplifying the signal, noise removing means for removing noise outside the signal band, or waveform equalizing means for correcting the amplitude difference of the signal depending on the frequency, and finally digitized into a digital value by a voltage comparator. The data is output as a data reproduction signal 124. The signal propagation delay time of each signal processing means that passes before the data reproduction signal 126 is extracted from the reflected light from the optical disk 101 is the operating voltage,
When the recording speed is high, the signal propagation delay time is not negligible.

The recording reference signal 122 is sent to the recording clock generating means 107. Recording clock generation means 1
In step 07, the recording reference signal 122 is binarized into a digital value by a voltage comparator, and the binarized recording reference signal is input to a PLL (phase locked loop) that synchronizes the phase with a reference clock. As a result, a recording clock 123 synchronized in phase with the converted recording reference signal is obtained.

The data reproduction signal 124 output from the reproduction signal processing means 106 is input to the delay measuring means 108, the address reproducing means 109, the synchronization information detecting means 110, and the recording timing control means 111. Synchronization information detection means 1
10 detects a synchronization code located at the head of a sync frame from the data reproduction signal 124 by pattern matching, and outputs a synchronization code detection timing signal 127.

The address reproducing means 109 generates a data reproduction signal 124 based on the synchronization code detection timing signal 127.
The address information part 126 is extracted and demodulated to reproduce the address information 126.

The delay measuring means 108 measures a delay time between the recording signal 121 and the data reproduction signal 124. FIG. 5 is a timing chart showing an example of the operation timing of the delay time measurement by the delay measurement means 108. Reference numeral 501 denotes a waveform of the recording signal 121 output by the recording signal generation unit 104. The laser control unit 105 controls the recording signal 501
The light intensity of the laser beam is changed according to. When the light intensity of the laser beam changes according to the recording signal 501, an electric signal obtained by converting the reflected light is output from the light detecting means in the optical head 103. The reproduction signal obtained from the electric signal in the reproduction signal processing unit 106 passes through an amplification unit, a noise removal unit, and a waveform equalization unit, and becomes a pre-binarization signal as shown by a waveform 502. Finally, the pre-binarization signal 5
By binarizing 02, a data reproduction signal 503 is obtained. The delay measuring unit 108 calculates the delay time 504 from the rising edge of the recording signal 501 to the rising edge of the data reproduction signal 503 by using the recording clock generating unit 10.
7 is measured by the recording clock 123 generated.

The recording timing control means 111 stores the address information 12 reproduced by the address reproducing means 109.
6, after detecting the last sector of the recorded area, the linking position is determined from the synchronization code detection timing detected by the synchronization information detection means 110 and the delay time 125 measured by the delay measurement means 108 during the previous recording. , And outputs a recording start timing signal 128 to the recording signal generation means 104. FIG. 6 is a timing chart showing an example of the operation timing of the recording timing control means 111. The recording timing control unit 111 waits until the synchronization code 604 of the first sync frame located immediately before the linking position 605 is detected in the address information 126 of the recorded area 601 and the synchronization code detection timing signal 127. When the synchronization information detection means 110 outputs the detection timing signal 608 of the synchronization code 604 of the first sync frame from the data reproduction signal 607, the count is started by the recording clock 123 from that point. The predetermined linking position is the synchronization code 60
4 and the delay time 606 of the laser control means 105, the optical head 103, and the reproduction signal means 106.
Is the Td obtained by the delay measurement, it can be seen that the recording start timing is the position where (256-Td) is counted from the synchronization code detection timing signal 608. Accordingly, when the count value of the recording clock 123 reaches (256-Td), the recording start timing signal 609 is output to the recording signal generation unit 104. Upon receiving the recording start timing signal 609, the recording signal generation unit 104 outputs the user data 12 as described above.
0 starts to output a recording signal 610 corresponding to
01 from a predetermined linking position 605 on the recording signal 61
New data 602 corresponding to 0 is recorded.

By controlling the recording start timing as described above, even if the signal propagation delay time in the laser control means 105, the optical head 103, and the reproduction signal processing means 106 fluctuates due to an operating voltage or temperature change, the accuracy of the linking position can be improved. Can be kept to less than one clock of the recording clock 123 used for delay measurement and recording timing counting. Further, by using the recording clock in the control of the delay measurement and the recording timing, the same linking position accuracy as in the low speed can be maintained even when the recording speed is increased.

(Embodiment 2) FIG. 2 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to Embodiment 2 of the present invention. In FIG. 2, reference numeral 201 denotes a recordable optical disk (for example, a DVD-R), and information serving as a reference for a recording frequency is previously recorded on a track of the optical disk 201 where information is recorded. Reference numeral 202 denotes a motor for rotating the optical disk 201. Numeral 203 denotes a laser light source (not shown) for generating a laser beam such as a semiconductor laser, a light converging means (not shown) for converging the laser beam on the recording surface of the optical disc 201, and a light source for focusing and tracking. The optical head includes a driving unit (not shown) for driving in the direction, and a light detecting unit (not shown) for receiving the reflected light from the recording surface of the optical disc 201 and converting the reflected light into an electric signal.

A recording signal generating means 204 modulates the user data 220 to be recorded according to a predetermined modulation method and outputs a recording signal 221. 205 is a recording signal 221
Is a laser control unit that controls the output of the laser light source in the optical head 203 according to. 206 is an optical head 203
And a reproduction signal processing unit for extracting the recording reference signal 222 and the data reproduction signal 224 from the electric signal output from the light detection unit. Reference numeral 207 denotes a recording clock generation unit that generates a recording clock 223 from the recording reference signal 222. 2
08 is a delay measuring means for measuring the delay time between the recording signal 221 and the data reproduction signal 224. Reference numeral 209 denotes an address reproducing unit for reproducing the address information 226 from the data reproduction signal 224. 210 is a data reproduction signal 224
Is a synchronization information detecting means for detecting a synchronization code from the. 2
Reference numeral 11 denotes recording timing control means for controlling the timing at which the recording signal generation means 204 starts outputting the recording signal 221. Reference numeral 212 denotes a CPU that controls the entire optical disc recording / reproducing apparatus. Reference numeral 213 denotes a voltage monitoring unit that monitors operating voltages of the optical head 203, the laser control unit 205, and the reproduction signal processing unit 206. 214 is the optical head 20
3 is a temperature monitoring means for monitoring the temperatures of the laser control means 205 and the reproduction signal processing means 206.

Next, the related operation of each component will be described. The operations of the optical head 203, the recording signal generation unit 204, the laser control unit 205, the reproduction signal processing unit 206, the recording clock generation unit 207, the address reproduction unit 209, the synchronization information detection unit 210, and the recording timing control unit 211 are the same as those described above. This is the same as in the first embodiment.

The voltage monitoring means 213 includes the optical head 203
The operating voltage sensors provided in the laser control means 205 and the reproduction signal processing means 206 measure the current operating voltages of the respective parts, and output the measured voltage values. The temperature monitoring unit 214 measures the current temperature of each unit by using a temperature sensor provided in the optical head 203, the laser control unit 205, and the reproduction signal processing unit 206, and outputs the measured temperature.

The delay measuring means 208 measures the voltage value measured by the voltage monitoring means 213 and the temperature measured by the temperature monitoring means 214 before measuring the delay time between the recording signal 221 and the data reproduction signal 224. Check. The confirmed voltage value and temperature are compared with the respective values obtained before, and if there is any change, or if the voltage value and temperature have been confirmed for the first time, delay measurement is performed. The subsequent operation relating to the delay measurement between the recording signal 221 and the data reproduction signal 224 is the same as that of the first embodiment. Further, when there is no change in the voltage value and the temperature, or when the change amount is small even if there is a change, the delay measurement is not performed because the change in the delay time can be determined to be negligibly small.

When it is determined that the fluctuation of the delay time with respect to the delay time obtained in the previous delay measurement is negligibly small by the monitoring processing of the operating voltage and the temperature as described above, the delay measurement processing can be omitted. The processing time required until the start of recording can be reduced.

(Embodiment 3) FIG. 3 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to Embodiment 3 of the present invention. In FIG. 3, reference numeral 301 denotes a recordable optical disk (for example, DVD-R), and information on the optical disk 301 on which information is recorded is recorded in advance as a reference for a recording frequency. Reference numeral 302 denotes a motor for rotating the optical disk 301. 303, a laser light source (not shown) that generates a laser beam such as a semiconductor laser;
Light converging means (not shown) for converging a laser beam on the recording surface of the optical disc 301; driving means (not shown) for driving the light converging means in the focus direction and the tracking direction; The optical head includes a light detection unit (not shown) for receiving the reflected light and converting the reflected light into an electric signal.

Reference numeral 304 denotes a recording signal generating means for modulating the user data 320 to be recorded according to a predetermined modulation method and outputting a recording signal 321. A laser control unit 305 controls the output of the laser light source in the optical head 303 according to the recording signal 321. Reference numeral 306 denotes a recording reference signal 3 based on the electric signal output from the photodetector in the optical head 303.
22, reproduction signal processing means for extracting the data reproduction signal 324; Reference numeral 307 denotes a recording clock generation unit that generates a recording clock 323 from the recording reference signal 322. 30
Reference numeral 8 denotes a delay measuring unit that measures a delay time between the recording signal 321 and the data reproduction signal 324. Reference numeral 309 denotes an address reproducing means for reproducing address information 326 from the data reproduction signal 324. Reference numeral 310 denotes synchronization information detecting means for detecting a synchronization code from the data reproduction signal 324. 31
Reference numeral 1 denotes a recording timing control unit that controls the timing at which the recording signal generation unit 304 starts outputting the recording signal 321. Reference numeral 312 denotes a CPU for controlling the entire optical disk recording / reproducing apparatus.

Next, the related operation of each component will be described. Optical head 303, reproduction signal processing unit 306, recording clock generation unit 307, address reproduction unit 309, synchronization information detection unit 310, and recording timing control unit 31
1 is the same as that of the first embodiment.

The recording signal generation means 304 adds address information and error correction information to user data to be recorded,
A CC signal is formed, and then a recording signal 321 modulated by inserting a synchronization code for each sync frame according to a predetermined modulation method (for example, 8-16 modulation method) is output from the timing when the recording start timing signal 328 becomes High. I do. In a section where the delay measurement signal 329 input from the delay measurement unit 308 is High, a predetermined test pattern (for example, a 14T repetition pattern) is output as the recording signal 321.

The light intensity of the laser beam output from the laser light source of the optical head 303 is controlled by the laser control means 305 according to the recording signal 321 and the delay measurement signal 329. In the section where the delay measurement signal 329 is Low,
In a section where the recording signal 321 is High, the light intensity is increased so that a recording mark is formed on the optical disc 301 (light intensity A), and in a section where the recording signal 321 is Low, the light intensity is decreased so that a recording mark is not formed (light intensity B). In addition, the delay measurement signal 32
9 is High, and the recording signal 321 is High.
In the section of h, the light intensity is increased (light intensity C) in a range where no recording mark is formed on the optical disc 301, and in the section of Low, the light intensity is reduced (light intensity B) so that no recording mark is formed. In the above, the light intensity level is the light intensity B <
Light intensity C <light intensity A.

The delay measuring means 308 measures a delay time between the recording signal 321 and the data reproduction signal 324. In the recorded area, the reflected light from the optical disc 301 is affected by the recorded data. Therefore, an accurate delay time cannot be obtained by simply comparing the rising edge of the recording signal 321 with the rising edge of the data reproduction signal 324. In order to facilitate the delay measurement, the delay measurement is performed in an unrecorded area where no information is recorded. When performing delay measurement, the delay measurement unit 308 outputs a delay measurement signal 329 to the recording signal generation unit 304 and the laser control unit 305. FIG. 5 is a timing chart showing an example of the operation timing of the delay time measurement by the delay measurement unit 308. Reference numeral 501 denotes a waveform of the recording signal 321 output by the recording signal generation unit 304 in a section where the delay measurement signal 329 is High. The laser control means 305 changes the light intensity of the laser beam according to the recording signal 501 to a range where the recording mark is not formed on the optical disc 301 (light intensity B or light intensity C).
To change. The light intensity of the laser beam is the recording signal 501
, An electric signal obtained by converting the reflected light is output from the light detecting means in the optical head 303. The reproduced signal obtained from the electric signal in the reproduced signal processing unit 306 passes through an amplification unit, a noise removal unit, and a waveform equalization unit, and becomes a pre-binarization signal as shown by a waveform 502.
Finally, the data reproduction signal 503 is obtained by binarizing the pre-binarization signal 502. Delay measuring means 308
Measures the delay time 504 from the rising edge of the recording signal 501 to the rising edge of the data reproduction signal 503 using the recording clock 323 generated by the recording clock generating means 307.

By the above-described delay measurement processing, the laser control means 305 and the optical head 30 are not actually recorded.
3 and the signal propagation delay time of the reproduction signal processing means 306 can be measured, so that the information recording capacity of the optical disk is not consumed.

(Embodiment 4) FIG. 4 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to Embodiment 4 of the present invention. In FIG. 4, reference numeral 401 denotes a recordable optical disk (for example, DVD-R), and information on the optical disk 401 on which information is recorded is recorded in advance as a reference for a recording frequency. Reference numeral 402 denotes a motor for rotating the optical disk 401. 403 is a laser light source (not shown) for generating a laser beam such as a semiconductor laser,
A light converging means (not shown) for converging a laser beam on the recording surface of the optical disc 401; a driving means (not shown) for driving the light converging means in the focus direction and the tracking direction; The optical head includes a light detection unit (not shown) for receiving the reflected light and converting the reflected light into an electric signal.

Reference numeral 404 denotes a recording signal generating means for modulating the user data 420 to be recorded according to a predetermined modulation method and outputting a recording signal 421. Reference numeral 405 denotes a laser control unit that controls the output of the laser light source in the optical head 403 according to the recording signal 421. Reference numeral 406 denotes a recording reference signal 4 based on the electric signal output from the light detecting means in the optical head 403.
22, a reproduction signal processing means for extracting the data reproduction signal 424; Reference numeral 407 denotes a recording clock generation unit that generates a recording clock 423 from the recording reference signal 422. 40
Reference numeral 8 denotes a delay measuring unit that measures a delay time between the recording signal 421 and the data reproduction signal 424. Reference numeral 409 denotes an address reproduction unit that reproduces address information 426 from the data reproduction signal 424. Reference numeral 410 denotes synchronization information detecting means for detecting a synchronization code from the data reproduction signal 424. 41
Reference numeral 1 denotes a recording timing control unit that controls the timing at which the recording signal generation unit 404 starts outputting the recording signal 421. A CPU 412 controls the entire optical disc recording / reproducing apparatus. Reference numeral 413 denotes a bypass unit that bypasses the laser drive signal output from the laser control unit 405 to the reproduction signal processing unit 406.

Next, the related operation of each component will be described. The operations of the optical head 403, the laser control unit 405, the reproduction signal processing unit 406, the recording clock generation unit 407, the address reproduction unit 409, the synchronization information detection unit 410, and the recording timing control unit 411 are the same as those in the first embodiment. is there.

The recording signal generating means 404 adds address information and error correction information to user data to be recorded,
A CC signal is formed, and then a recording signal 421 modulated by inserting a synchronization code for each sync frame according to a predetermined modulation method (for example, 8-16 modulation method) is output from the timing when the recording start timing signal 428 becomes High. I do. In a section where the delay measurement signal 429 input from the delay measurement unit 408 is High, a predetermined test pattern (for example, a 14T repetition pattern) is output as the recording signal 421.

The bypass means 413 is connected to the delay measuring means 40
In a section in which the delay measurement signal 429 input from the optical head 8 is Low, the laser drive signal from the laser control unit 405 is input to the optical head 403, and the electric signal from the light detection unit of the optical head 403 is reproduced signal processing unit Input to 406. In a section where the delay measurement signal 429 is High, a laser drive signal for controlling the light intensity at the time of reproduction is input to the optical head 403, and the laser control unit 405 outputs the laser signal instead of the electric signal from the light detection unit. The drive signal is input to the reproduction signal processing means 406.

The delay measuring means 408 measures a delay time between the recording signal 421 and the data reproduction signal 424. When the delay measurement is performed, the delay measurement unit 408 outputs a delay measurement signal 429 to the recording signal generation unit 404 and the bypass unit 413. FIG. 5 is a timing chart showing an example of the operation timing of the delay time measurement by the delay measuring means 408. 501 indicates that the delay measurement signal 429 is High.
7 shows the waveform of the recording signal 421 output by the recording signal generating means 404 in the section of FIG. Laser control means 405
Outputs a laser drive signal that changes the light intensity of the laser beam according to the recording signal 501. The laser drive signal is supplied to the reproduction signal processing unit 406 by the bypass unit 413.
Bypassed to In the reproduction signal processing unit 406, the reproduction signal obtained from the laser drive signal passes through an amplification unit, a noise removal unit, and a waveform equalization unit, and the waveform 5
02 before the binarization. Finally, by binarizing the pre-binarization signal 502, the data reproduction signal 5
03 is obtained. The delay measuring means 408 outputs the recording signal 50
The delay time 504 from the rising edge of 1 to the rising edge of the data reproduction signal 503 is measured by the recording clock 423 generated by the recording clock generation means 407.

By the above-described delay measurement processing, the signal propagation delay time of the laser control means 405 and the reproduction signal processing means 406 occupying most of the delay time can be measured without actually recording the information. It is not necessary to spend recording capacity.

In the above-described embodiment, the delay measurement and the counting up to the linking position are counted by the recording clock. However, the present invention is not limited to this, and the delay generation and the counting from the data reproduction signal to the reference clock having a higher frequency than the data recording frequency are performed. The same effect can be obtained by counting using the reproduced clock. In the above-described embodiment, the linking position is controlled using the measured delay time. However, the present invention is not limited to this. In order to optimally control the light intensity of the laser beam, the output electric signal of the light detecting means and the reproduction signal processing are controlled. Also in the control of the sampling timing for sampling the voltage value of the reproduction signal in the means, the accuracy of the sampling timing can be maintained by using the measured delay time.

In the above embodiment, the DVD
Although the recording start timing control for -R has been described,
The present invention is not limited to DVD-Rs, but includes CD-Rs, CD-RWs,
The same effect can be obtained in recordable optical disks such as VD-RW and DVD-RAM.

[0055]

As described above, according to the optical disk recording / reproducing apparatus of the present invention, the recording start timing is controlled in accordance with the signal propagation delay time in the laser control means, the optical head, and the reproduction signal processing means, so that high-speed recording is achieved. Even when the signal propagation delay time changes due to a change in operating voltage or temperature during recording, the accuracy of the linking position can be maintained.

The time required for the optical disk recording / reproducing apparatus of the present invention to start recording can be reduced by providing a voltage monitoring means and a temperature monitoring means and measuring the delay time only when the voltage value or the temperature changes. can do.

Further, by performing the delay measurement in the unrecorded area, the reproduction signal is not affected by the recorded data, so that the delay time between the recording signal and the reproduction signal can be easily measured.

During the delay measurement, the delay time can be measured without consuming the information recording capacity of the optical disk by changing the light intensity of the laser beam within a range where no recording mark is formed on the optical disk. .

By providing a bypass means for inputting the laser drive signal to the reproduction signal processing means, the delay time can be measured without consuming the information recording capacity of the optical disk.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disc recording / reproducing apparatus according to a first embodiment of the present invention;

FIG. 2 is a block diagram showing a configuration of an optical disk recording / reproducing apparatus according to a second embodiment of the present invention;

FIG. 3 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to a third embodiment of the present invention;

FIG. 4 is a block diagram showing a configuration of an optical disc recording / reproducing apparatus according to a fourth embodiment of the present invention;

FIG. 5 is a timing chart showing delay times of a recording signal and a data reproduction signal.

FIG. 6 is a timing chart showing control of recording start timing.

FIG. 7 is a diagram schematically illustrating a data format of a DVD-R.

FIG. 8 is a timing chart showing a conventional linking method.

[Explanation of symbols]

101, 201, 301, 401 Optical disks 102, 202, 302, 402 Motors 103, 203, 303, 403 Optical heads 104, 204, 304, 404 Recording signal generating means 105, 205, 305, 405 Laser control means 106, 206, 306, 406 reproduction signal processing means 107, 207, 307, 407 recording clock generation means 108, 208, 308, 408 delay measurement means 109, 209, 309, 409 address reproduction means 110, 210, 310, 410 synchronization information detection means 111 , 211, 311, 411 Recording timing control means 112, 212, 312, 412 CPU 213 Voltage monitoring means 214 Temperature monitoring means 413 Bypass means 120, 220, 320, 420 User data 121, 221 and 321 421 Recording signal 122,222,322,422 Recording reference signal 123,223,323,423 Recording clock 124,224,324,424 Data reproduction signal 125,225,325,425 Delay time 126,226,326,426 Address information 127, 227, 327, 427 Synchronous code detection timing signal 128, 228, 328, 428 Recording start timing signal 329, 429 Delay measurement signal 501, 610, 808, 811 Waveform of recording signal 502 Waveform of reproduction signal before binarization 503 , 607, 807, 810 Data reproduction signal waveform 504, 606, 806, 809 Delay time 601, 801 Recorded data 602, 802 Newly recorded data 603, 705, 706, 803 Sync frame 604, 707, 804 Sync code 605, 708, 805 Linking position 608 Waveform of sync code detection timing signal 609 Waveform of recording start timing signal 701 ECC block 702, 703, 704 Sector 812 Shift amount

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toyoharu Gurushima 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 5D044 BC05 CC04 EF02 5D090 AA01 BB03 DD03 EE15 FF33 FF34 JJ07

Claims (12)

[Claims] A laser light source for irradiating a laser beam to an optical disc; a recording signal generating means for generating a recording signal according to information to be recorded; a laser control means for controlling the laser light source according to the recording signal; Light detection means for receiving reflected light of a laser beam applied to an optical disc and converting the reflected light into an electric signal; reproduction signal processing means for extracting a reproduction signal from the electric signal; and a delay between the recording signal and the reproduction signal A delay measuring unit that measures time, and a recording timing control unit that controls a timing at which the recording signal generating unit starts outputting the recording signal, wherein the recording timing control unit is measured by the delay measuring unit. An optical disc recording device for controlling a timing at which the recording signal generating means starts outputting the recording signal in accordance with a delay time; Raw devices. 2. The apparatus according to claim 1, wherein said laser control means further comprises a bypass means for inputting a laser drive signal for controlling said laser light source to said reproduction signal processing means, wherein said delay measurement means performs delay measurement. During the period,
2. The optical disk recording / reproducing apparatus according to claim 1, wherein the laser drive signal is input to the reproduction signal processing means. 3. A voltage monitoring means for monitoring at least one operating voltage among a laser control means, a light detection means, and a reproduction signal processing means, wherein the delay measuring means comprises a voltage monitored by the voltage monitoring means. 3. The optical disk recording / reproducing apparatus according to claim 1, wherein delay measurement is performed when the value changes. 4. A temperature monitoring means for monitoring at least one of the laser control means, the light detection means, and the reproduction signal processing means, wherein the delay measuring means has a temperature monitored by the temperature monitoring means. 3. The optical disk recording / reproducing apparatus according to claim 1, wherein delay measurement is performed when the value changes. 5. An optical disk recording / reproducing apparatus according to claim 1, wherein said delay measuring means measures the delay in an unrecorded area on the optical disk where no information is recorded. 6. The apparatus according to claim 1, wherein said laser control means controls the light intensity of the laser beam at a light intensity within a range in which no information is recorded on the optical disk during a period when the delay measuring means is performing the delay measurement. 2. The optical disk recording / reproducing apparatus according to 1. 7. A recording timing control method for controlling a timing of starting to record information on an optical disk, comprising: a recording signal generated from information to be recorded; and a light intensity corresponding to the recording signal. A recording timing control method, comprising: controlling a recording start timing based on a delay time between a reproduction signal obtained from reflected light of a laser beam and a reproduction signal. 8. An electric signal to be obtained from reflected light of a laser beam applied to an optical disk at a light intensity according to the recording signal, from the recording signal, and a reproduction signal being obtained from the electric signal. The recording timing control method according to claim 7, wherein: 9. The recording timing control method according to claim 7, wherein the delay time is measured when a power supply voltage of the optical disk recording / reproducing apparatus changes. 10. The recording timing control method according to claim 7, wherein the delay time is measured when the temperature of the optical disk recording / reproducing device changes. 11. The recording timing control method according to claim 7, wherein the delay time is measured in an unrecorded area on the optical disc where no information is recorded. 12. The recording timing according to claim 7, wherein the light intensity of the laser beam changed according to the recording signal during the delay measurement is a light intensity in a range where information is not recorded on the optical disk. Control method.