JPH09147361A - Optical disk recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record a signal in order to form an optical recording trace of always steady size by controlling a level of a driving pulse from a driving pulse source based on a detected phase difference. SOLUTION: A recording track on an optical disk 11 rotating at a fixed linear velocity is irradiated with a recording light beam. A part close to the recording light beam irradiating part of a recording track but separated by a prescribed distance from this irradiating part is irradiated with a reproducing light beam. A return light beam of the reproducing light beam from the optical disk 11 is detected by a photodetector of an optical head 13. A data pulse having a time width corresponding to a value of an input data (a) is generated by a generating source 5. Then, an edge of a detected pulse from the photodetector is phase-compared with an edge of the data pulse from a delay means 15 by a phase comparator means 16. The level of the driving pulse from the pulse source is controlled based on a detecting phase difference, so as to make the detecting phase difference from the comparator meand 16 a prescribed value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording device.

[0002]

2. Description of the Related Art In an optical disk recording apparatus, even if data is recorded by irradiating an optical disk with a light beam of the same intensity, the optical disk may be affected by a difference in ambient temperature, a difference in optical sensitivity of the optical disk, or the like. The size of the optical recording traces such as pits formed on the recording track, especially the length in the track direction changes, and when the change is large, an error occurs during reproduction.

Therefore, conventionally, it is possible to record a test signal on an optical disk in advance, reproduce it, and select an optimum intensity of a light beam to be irradiated on the optical disk based on observation of a waveform of the test data. Has been done.

[0004]

However, the work of recording and reproducing the test signal on the optical disk is complicated and wastes time. In the case of an optical disc that cannot be overwritten, it is necessary to erase the test signal, which further complicates the work and wastes unnecessary time.

In view of the above point, the present invention does not require complicated work, and there is no fear of wasting time, and if the data values are the same, the optical recording trace of a constant size is always present. An optical disc recording apparatus capable of recording a signal so as to form an optical disc is proposed.

[0006]

According to the present invention, there is provided a recording light source for generating a recording light beam for irradiating a recording track of an optical disk which is rotated at a constant linear velocity, and a recording light beam irradiating section for the recording track. An optical head provided with a reproducing light source that emits a reproducing light beam that irradiates a portion that is close to, and that is separated from the irradiation unit by a predetermined distance, and a photodetector that detects a reflected light beam from the optical disc of the reproducing light beam. , A data pulse source for generating a data pulse having a time width corresponding to the value of the input data, and an optical recording trace having a length corresponding to the value of the input data on the recording track based on the data pulse A drive pulse generator that generates a drive pulse and supplies it to the recording light source, a delay unit that delays the data pulse for a time obtained by dividing a predetermined distance by the linear velocity, and a photodetector Based on the detected phase difference, the phase comparison means for comparing the edge of the detection pulse with the edge of the data pulse from the delay means and the detected phase difference from the phase comparison means from the drive pulse source. The optical disk recording apparatus is characterized in that the level of the drive pulse of (1) is controlled.

According to the present invention, the recording light beam from the recording light source of the optical head irradiates the recording track of the optical disk which is rotated at a constant linear velocity. The reproducing light beam from the reproducing light source of the optical head irradiates a portion of the recording track which is close to the recording light beam irradiation portion and is separated from the irradiation portion by a predetermined distance. The photodetector of the optical head detects the returning light beam of the reproducing light beam from the optical disk. The data pulse generation source generates a data pulse having a time width according to the value of input data. The drive pulse generation source forms an optical recording trace of a length corresponding to the input data value on the recording track based on the data pulse of the time width corresponding to the input data value generated by the data pulse generation source. Drive pulse is generated. The phase comparison means phase compares the edge of the detection pulse from the photodetector with the edge of the data pulse from the delay means.
So that the detected phase difference from the phase comparison means becomes a predetermined value,
The level of the drive pulse from the drive pulse source is controlled based on the detected phase difference.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. First, FIG. 1 showing an embodiment.
This will be described with reference to FIG. Reference numeral 11 denotes an optical disk which can be additionally written or rewritten, and is rotated at a constant linear velocity by a motor 12 including a servo circuit. Reference numeral 13 denotes an optical head, which generates a reproducing light beam that irradiates a recording light source that generates a recording light beam and a portion of the recording track that is close to the recording light beam irradiation portion and is separated from the irradiation portion by a predetermined distance. A light source for reproduction and a photodetector for detecting a reflected light beam of the reproduction light beam from the optical disk are provided.

The structure of the optical head 13 is shown in FIG.
This will be described with reference to FIG. A divergent light beam from a laser diode 30 as a light source (laser light source) enters a collimator lens 31 and is converted into a parallel light beam. The parallel light beam from the collimator lens 31 enters the diffraction grating 32 and is split into a main light beam (0th order diffracted light beam) indicated by a solid line and both side beams (± 1st order diffracted light beam) indicated by broken lines on both sides thereof. It The ratio of the light amounts of the main and both side light beams is 8: 1. The main and both side light beams from the diffraction grating 32, after passing through the polarization beam splitter 33, have a λ / 4 plate (where λ is the wavelength of the laser light beam from the laser diode 30, here 780 nm). ) 34 and enters a mirror (total reflection mirror) 35. The reflected light beam from the mirror 35 is at a 90 ° angle to the incident light beam, and
The light travels in a direction perpendicular to the optical disc 11, is focused by an objective lens (numerical aperture NA is, for example, 0.50) 36, and is focused on the optical disc 11.

Now, referring to FIG. 3, the optical disc 1
The beam spots of the main and both side light beams on 1 will be described. In FIG. 3, GR is a groove in which concentric recording tracks are formed (its width is, for example,
0.8 μm) and L indicates a land between the grooves B (its width is, for example, 0.8 μm). A recording track may be formed on the land L. The optical head 13 performs tracking control and focusing control so that the focused beam spots C, D1 and D2 of the main and both side light beams on the optical disk 11 are located on the circular center line of the groove GR. In FIG. 3, H indicates the rotation direction of the optical disk 11. G indicates the distance between the beam spots C, D1 and D2 on the optical disk 11, which is, for example, 20 μm. Here, the main light beam (light beam of the beam spot C) is a recording light beam, and one side light beam (light beam of the beam spot D2) is a reproducing light beam. When the recording light beam records data on the groove GR of the optical disk 11 so as to form an optical recording trace, the reproducing light beam irradiates the groove GR so as to reproduce the optical recording trace.

The reproducing light beam may be emitted from a light source other than the laser diode 30 which is the light source of the recording light beam.

Returning to FIG. 2, the optical disc 1 will be described.
The reflected and divergent light beam from 1 is an objective lens (condenser lens)
Incident on the mirror 36, converted into a parallel light beam, and reflected by the mirror 35.
Incident on, and its optical path is deflected by 90 °, then λ
The light beam passes through the / 4 plate 34, enters the deflecting beam splitter 33, is reflected by the reflecting surface thereof, and its optical path is deflected by 90 °, and proceeds in a direction perpendicular to the light receiving surface of the photodetector 38. The parallel main and both side light beams from the polarization beam splitter 33 are made incident on a multi-lens (condensing lens) 37 and are condensed, and a photodetector (for example, pin).
Each is focused on the light receiving surface of the diode 38.

Now, with reference to FIG. 4, the beam spots of the main and both side light beams focused on the photodetector 38 and its photodetecting surface will be described. The photodetector 38 is divided into four photodetector portions BA, BB, BC and BD in which a beam spot C'of the main light beam is formed, and beam spots D1 ', D2' of both side light beams are formed. The photo detectors BE, BF; B divided into two parts, respectively.
It is composed of G and BH. The beam spots C ′ and D of the main and both side light beams on the photodetector 38 are
The arrangement of 1'and D2 'is such that the beam spots C, D1 and D2 on the optical disk 11 of FIG. Photodetectors BA, BB, B
The light detection signals from C and BD are S (BA) and S, respectively.
(BB), S (BC), S (BD), S (B
The focus error signal is obtained by A) + S (BC)-{S (BB) + S (BD). S (BA) + S (B
The tracking error signal is obtained by D)-{S (BB) + S (BC)} and is supplied to the focus actuator and the tracking actuator (both not shown) in the optical head 13.

Of the two side light beams, the side light beam forming the beam spot D2 'on the photodetection portions BH and BG is used as the reproduction light beam, and the light detection portions BG and BG are detected.
The sum of the BH light detection outputs S (BG) and S (BH) is the reproduction output. In this case, the photodetection outputs from the photodetectors BE and BF of the beam spot D1 'of the other side light beam are not used here.

As shown in FIG. 5, the beam spot C of the main light beam is located on the circular center line of the groove GR, but the beam spots D1 and D2 of the both side light beams on the optical disk 11 are the main light beams. The circular center line of the groove B in which the beam is located may be deviated in the opposite direction from each other by the same length at ¼ or less of the track pitch. In this case as well, the side beam of the beam spot D2 remains the reproducing beam, but the tracking error can be detected by the differential push-pull method. In this case, in the photodetector 38, the tracking error signal is [{S (BA) + S (BD)}
-{S (BB) + S (BC)}-k [{S (BF) -S
(BE)} + {S (BH) -S (BG)}. However, k is a constant of 0 <k <1.

Returning to FIG. 1, the description will be continued. Input terminal 1
Input data a such as video and audio from the interface circuit 2 is supplied to the interface circuit 2, and an output b thereof is supplied to the modulator 3, and based on the clock signal c from the clock generator 4, the RLL (1, 7) Edge modulation is performed. Incidentally, R
LL is run length limited (run length limit
ed), and (1,7) means that the number of 0s between 1 and 1 is 1 to 7.

The output d of the modulator 3 and the clock signal c from the clock generator 4 are supplied to the pulse train generator 5, and the output e from the pulse train generator 5 is supplied to the changeover switch 9 as a changeover signal. It The time width of the input signal to the pulse train generator 5 is 2T each.
The signal waveforms of (the number of 0s between 1 and 1 is 1) to 8T (the number of 0s between 1 and 1 is 81) are shown in FIGS. Incidentally, T represents the cycle of the clock signal from the clock generator 4. 6A to 6G show waveforms of the output signal e of the pulse train circuit 5 corresponding to FIGS. 6A to 6G.
(G). The waveform of the output signal e in FIGS. 6A to 6G is initially a pulse having a time width of 1.5T, and thereafter, 0 to 6 pulses having a time width of 0.5T are respectively times 0.
It has a continuous waveform with a gap of 5T.

Reference numerals 7 and 8 respectively denote low and high level controllers for alternately switching the laser light intensity of the laser diode 30 (FIG. 2) of the optical head 13 to the intensity of the recording and reproducing laser light. It is a thing. The low and high laser light control signals g and h are switched by the changeover switch 9, and the switching output i is supplied to the drive circuit 10, and the waveform e from the drive circuit 10 shown in FIGS.
A pulse train current whose current is switched between high and low levels is supplied to the laser diode 30 (see FIG. 2) of the optical head 13 so that the intensity of the laser light is alternately changed to the recording and reproducing laser. The intensity of light is switched to the input signal to the pulse train generator 5 (FIG. 6).
Optical recording traces having a length in the recording track direction substantially equal to the length obtained by multiplying the time width of (A) to (G) by the linear velocity of the optical disc 11 are the bottom surfaces of the grooves B (see FIG. 3) of the optical disc 11. The data is recorded as if

Then, one side light beam (about 1/8 of the intensity of the main light beam) irradiated on the optical disk 11 is used.
The reflected light beam (having an intensity of 1) is detected by the photodetectors BG and BH of the photodetector 38, and its detection signal k is supplied to the phase comparator 16 through the high-pass filter 15 for removing servo data. The output signal d of the modulator 3 is supplied to the delay device 14, and the distance (for example, 20 μm) between the main light beam and the side light beam between the irradiation portions on the optical disk 11 is set to a linear velocity (for example, 5 m / sec).
) And the delayed signal m is supplied to the phase comparator 16.

The phase comparator 16 sends the modulated signal d from the modulator 3 to the phase comparator 16 in the low level period (no signal period) of the modulated signal d {FIG. 7A}. The output pulse signal d of the modulator 3 is generated only during the high level period of the gate signal v {FIG. 7 (C)} obtained by phase inversion by the built-in phase inverter (may be built in the modulator 3). Delay modulated signal m delayed by the delay device 14 of FIG.
(See (D)) and detection pulse signals (reproduction signals) n, n ′, n ″ from the high pass filter 15 (FIG. 7 (E),
(F) or (G)}, the phases of the respective rising and falling edges are compared as shown by the solid line (thin line). Therefore, phase comparison (shown by a broken line) of both edges in the low level period of the gate signal v is not performed.
The no-signal period is uniquely determined according to the time width 2T to 8T of the modulated signal d based on the edge modulation of RLL (1,7). The reproduced signal n {FIG. 7 (E)} corresponds to the case where the phase of the edge matches the phase of the edge of the delayed modulated signal m. The reproduced signal n ′ {FIG. 7 (F)} is the case where the phase of the edge is behind the phase of the edge of the delayed modulated signal m. The reproduction signal n ″ {FIG. 7 (G)} is
This is the case where the phase of the edge leads the phase of the edge of the delayed modulated signal m.

When the recording track is irradiated with the recording laser light beam by the optical head 13 according to the irradiation pattern u (corresponding to the output e of the pulse train generator 5) in FIG. 7B, the reproducing diffraction laser is used. The light beam also has a similar irradiation pattern, and detection pulse signals (reproduction signals) n, n ′, n ″ of the high-pass filter 15 {FIG. 7 (E),
(F), (G)} are also affected by this irradiation pattern u, but the low-level period (no signal period) of the modulated signal d from the modulator 3 (FIG. 7A) (gate signal v Only in the high level period), the delayed modulated signal m from the delay device 14 (FIG. 7).
(D)} and the detection pulse signals (reproduction signals) n, n ′, and n ″ from the high-pass filter 15 are solid lines (thin lines).
As shown in FIG. 6, by comparing the phases of the rising and falling edges, it is possible to reliably detect the intensity of the recording laser light beam.

Then, the comparison output o of the phase comparator 16 is supplied to the selector 17. The selector 17 has a low level period (no signal period) of the modulated signal d from the modulator 3 (FIG. 7 (A)), that is, the modulated signal d is a phase inverter (built in the selector 17 ( (Although it may be built in the modulator 3), the absolute value of the phase difference, which is the comparison output o from the phase comparator 16, is changed only during the high level period of the gate signal {FIG. 7C} obtained by phase inversion. When it is determined that it is T / 3 or less, the phase difference p is supplied to the integrator 18, and when it is determined that it exceeds T / 3, the phase difference is not supplied to the integrator 18.

The integrator 18 has a phase difference p from the selector 17.
And the phase difference with respect to the rising edge of the delayed modulated signal m,
Classifying into a phase difference with respect to the falling edge, a function of integrating for a predetermined time, and a function of calculating the difference between the respective integrated values,
It has a function of averaging the difference by the total number of phase differences between rising edges and falling edges of the delayed modulated signal m. Therefore, here, the finally obtained average value is output as the integrated output q, and the integrated output q is supplied to the high level controller 8 to control the high level. From the integrated output q, how much the length in the recording track direction of the optical recording trace formed on the recording track of the optical disk 11 is longer than the predetermined length corresponding to the pulse width 2T to 8T of the modulated signal d, Shortness is detected. The length in the recording track direction of the optical recording trace formed on the recording track of the optical disk 11 is the modulated signal d.
If the pulse length is longer than a predetermined length corresponding to the pulse width 2T to 8T, the high level is lowered according to the difference, and if it is shorter than the predetermined length, the high level is raised according to the difference to reach the predetermined length. Thus, the high level controller 8 is controlled.

In this way, the optical disc 1 in which the optical recording traces corresponding to the input data are formed in the groove GR
When data is reproduced from 1, the laser diode 30 generates a light beam having a weak light intensity while the changeover switch 9 is fixedly switched to the low level controller 7 side.
Through the optical system of the optical head 13 having the configuration shown in FIG. 2, the focusing reproduction light beam is irradiated from the objective lens 36 to the groove B of the optical disk 11, and the reflected light beam, that is, the main and both side light beams, Through the optical system of the optical head 13 of FIG. 2, the focused light beam is applied to the photodetector 38 to obtain the reproduction data, the focus error signal and the tracking error signal from the photodetectors BA, BB, BC and BD, It is supplied to the focusing actuator and the tracking actuator of the optical head 13. When the beam spots D1 and D2 of the light beams on both sides deviate from the beam spot C of the main light beam by ¼ or less of the track pitch as shown in FIG.
A differential push-pull tracking error signal may be obtained from the photodetection outputs from E, BF, BG, and BH.

Then, the photodetectors BA and B of the photodetector 38.
A signal l, which is the sum of the detection outputs from B, BC, and BD, is supplied to a high-pass filter 19 for removing servo data, and its output r demodulator 20 for demodulating the edge modulation of RLL (1,7). Is supplied to the interface 21, and the output t is output from the output terminal 22 as reproduction data such as audio and video.

In the embodiment of FIG. 1, the integrated output q from the integrator 18 is supplied to the high level controller 8 to control the higher intensity of the laser light beam from the laser diode 30. The timings of the leading edge and the trailing edge of the pulse signal e from the pulse train generator 5 may be controlled. An embodiment in that case will be described with reference to FIG. In addition, in FIG. 8, portions corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

In the embodiment shown in FIG. 8, an edge shifter 6 is provided at the next stage of the pulse train generator 5, and the pulse train e from the pulse train generator 5 is transferred to the edge shifter 6.
And based on the integrated output q from the integrator 18,
It controls the timing of the leading edge and the trailing edge of the pulse train e.

The integrator 18 classifies the phase difference p from the selector 17 into a phase difference with respect to a rising edge and a phase difference with respect to a falling edge of the delayed modulated signal m, as in the above-described embodiment, It has a function of integrating for a predetermined time, a function of calculating the difference between the respective integrated values, and a function of averaging the difference with the total number of the phase differences for the rising and the falling of the delayed modulated signal m. doing. Therefore, here, the finally obtained average value is output as the integrated output q, and this integrated output q is output by the edge shifter 6
Pulse train e, which is the output of the pulse train generator 5 (shown in FIG. 9A to FIG.
The phases of the leading edge and the trailing edge of (g)} are controlled. From the integrated output q, how long the length in the recording track direction of the optical recording trace formed on the recording track of the optical disk 11 is longer than the predetermined length corresponding to the pulse width 2T to 8T of the modulated signal d, Shortness is detected.

When the length in the recording track direction of the optical recording trace formed on the recording track of the optical disk 11 is longer than the predetermined length corresponding to the pulse width 2T to 8T of the modulated signal d, it depends on the difference. The phase of the leading and trailing edges is controlled so that the time width of the first and last pulses of the pulse train is shortened, and when it is shorter than a predetermined length, the first and last pulses of the pulse train are adjusted according to the difference. The phase of the leading edge and the trailing edge is controlled so as to increase the time width of, and the edge shifter 6 is controlled so as to have a predetermined length. Then, the output f of the edge shifter 6 is supplied to the changeover switch 9 to control the changeover. Other configurations and operations of the circuit of FIG. 8 are similar to those of FIG.
Is the same as

In the above embodiment, the reproducing light beam uses the same light source as the recording light beam, that is, the recording light beam from the recording light source is incident on the diffraction grating to obtain a diffracted light beam. Is used as the reproducing light beam, the structure of the optical head is simplified. However, a reproducing light source (laser light source) (laser diode) independent of the recording light source may be provided to obtain the reproducing light beam.

[0031]

According to the first aspect of the present invention described above, a recording light source for generating a recording light beam for irradiating a recording track of an optical disk rotated at a constant linear velocity and a recording light beam for the recording track. The light source for reproduction and the light beam for reproduction for irradiating a portion which is close to the irradiation portion of the recording medium and is separated from the irradiation portion by a predetermined distance to generate a reproduction light beam for reproducing the optical recording trace by the recording light beam. Optical head equipped with a photodetector that detects the reflected light beam from the optical disc, a data pulse generation source that generates a data pulse of a time width according to the value of input data, and a recording track based on the data pulse. It is obtained by dividing the specified distance by the linear velocity and the drive pulse generation source that supplies the recording light source with a drive pulse that generates an optical recording trace with a length corresponding to the value of the input data. The delay means delays the data pulse by the time, the phase comparison means compares the edge of the detection pulse from the photodetector with the edge of the data pulse from the delay means, and the detected phase difference from the phase comparison means is a predetermined value. As described above, the level of the drive pulse from the drive pulse source is controlled based on the detected phase difference, so recording, reproduction, and erasing of the test signal are unnecessary, and no complicated work is required. It is possible to obtain an optical disk recording apparatus capable of recording a signal so as to always form an optical recording trace having a constant size, without waste of time and if the data value is the same.

According to the second aspect of the present invention described above, the recording light source for generating the recording light beam for irradiating the recording track of the optical disk rotated at a constant linear velocity, and the irradiation of the recording light beam for the recording track. Of a reproducing light source and a reproducing light beam that emits a reproducing light beam for reproducing an optical recording trace by the recording light beam by irradiating a portion that is close to the recording unit and is separated from the irradiation unit by a predetermined distance. An optical head equipped with a photodetector that detects the reflected light beam from the disk, a data pulse generation source that generates a data pulse with a time width according to the value of the input data, and input data to the recording track based on the data pulse. Drive pulse generation source that generates a drive pulse for forming an optical recording trace of a length corresponding to the value of Edge control means for supplying a recording light source with a drive pulse with variable iming, delay means for delaying a data pulse by a time obtained by dividing a predetermined distance by a linear velocity, and detection pulse of a photodetector. Based on the detected phase difference, the timing of the edge of the drive pulse from the edge control means is adjusted so that the detected phase difference from the phase comparison means has a predetermined value. Since it is controlled, there is no need for complicated work, there is no fear of wasting time, and if the data values are the same, it is possible to always form a signal such that an optical recording trace of a constant size is formed. It is possible to obtain an optical disc recording device capable of recording the data.

According to the third aspect of the present invention described above, in the optical disc recording apparatus of the first aspect of the present invention, the recording light beam and the reproducing light beam are applied to the center of the recording track in the width direction. Therefore, it is possible to obtain an optical disc recording device that can obtain the same effects as the effects of the first aspect of the present invention.

According to the fourth aspect of the present invention described above, in the optical disc recording apparatus of the second aspect of the present invention, the recording light beam and the reproducing light beam are applied to the center of the recording track in the width direction. Therefore, it is possible to obtain an optical disc recording device that can obtain the same effects as the effects of the second invention.

According to the fifth aspect of the present invention described above, in the optical disc recording apparatus of the first aspect of the present invention, the recording light beam is applied to the center of the recording track in the width direction, and the reproducing light beam is emitted. A pair of reproducing light beams are arranged in front of and behind the recording light beam, and at a position deviated from the center of the recording track in the width direction by an equal amount in the opposite direction by ¼ or less of the track pitch. Therefore, the same effect as the effect of the first aspect of the present invention can be obtained, and the return light beam from the optical disc of the recording light beam and the pair of reproduction light beams is detected by the optical detection. Since the differential push-pull type tracking error signal can be obtained, it is possible to obtain an optical disk recording device that enables stable tracking servo.

According to the sixth aspect of the present invention described above, in the optical disc recording apparatus of the second aspect of the present invention, the recording light beam is applied to the center of the recording track in the width direction, and the reproducing light beam is emitted. And irradiate the recording light beam to the center of the recording track in the width direction, and provide a pair of reproduction light beams to be arranged before and after the recording light beam, and from the center of the recording track in the width direction. Since the pair of reproducing light beams are irradiated at the positions displaced by equal amount in the opposite direction by ¼ or less of the track pitch, the same effect as the effect of the second invention can be obtained. In addition to this, it is possible to obtain the tracking error signal of the differential push-pull method and obtain the optical disk recording device that enables stable tracking servo.

According to the seventh aspect of the present invention described above, in the optical disc recording apparatus of the first aspect of the present invention, the average value of the integrated values of the detected phase differences obtained by the phase comparison within the predetermined period by the phase comparison means is Since the level of the drive pulse from the drive pulse source is controlled based on the average value of the integrated values of the detected phase differences so that the predetermined value is obtained, the same effect as the effect of the first aspect of the present invention can be obtained. Moreover, when noise is mixed in the detected phase difference, it is possible to obtain an optical disk recording apparatus capable of eliminating the influence of the noise.

According to the eighth aspect of the present invention described above, in the optical disc recording apparatus of the second aspect of the present invention, the average value of the integrated values of the detected phase differences obtained by the phase comparison within the predetermined period by the phase comparison means is Since the timing of the edge of the drive pulse from the edge control means is controlled based on the average value of the integrated values of the detected phase differences so that the predetermined value is achieved, the same effect as the effect of the second aspect of the present invention. It is possible to obtain an optical disc recording apparatus capable of eliminating the influence of noise when the detected phase difference contains noise.

According to the ninth aspect of the present invention described above, in the optical disc recording apparatus of the first aspect of the present invention, when the detected phase difference obtained by the phase comparison by the phase comparison means is outside the predetermined range, the detected phase difference is detected. Since the control of the level of the drive pulse from the drive pulse source based on
It is possible to obtain an optical disk recording apparatus capable of obtaining the same effects as those of the present invention and capable of eliminating the influence of the defect when the optical disk has a defect.

According to the tenth aspect of the present invention described above, in the optical disk recording apparatus of the second aspect of the present invention, when the detected phase difference obtained by the phase comparison by the phase comparison means is outside the predetermined range, the detected phase difference is detected. Since the control of the timing of the edge of the drive pulse by the edge control means based on the above is stopped, the same effect as the second aspect of the present invention can be obtained, and when the optical disc has a defect, the defect can be obtained. It is possible to obtain an optical disk recording device that can eliminate the influence of the above.

According to the eleventh aspect of the present invention described above, in the optical disc recording apparatus of the seventh aspect of the present invention, when the detected phase difference obtained by the phase comparison by the phase comparison means is outside the predetermined range, it is out of the predetermined range. Since the detected phase difference of is excluded from the calculation of the average value of the integrated value of the detected phase difference, the same effect as the effect of the seventh aspect of the present invention can be obtained, and when the optical disc has a defect, It is possible to obtain an optical disk recording device capable of eliminating the influence.

According to the twelfth aspect of the present invention described above, in the optical disc recording apparatus of the eighth aspect of the present invention, when the detected phase difference obtained by the phase comparison by the phase comparison means is outside the predetermined range, it is out of the predetermined range. Since the detected phase difference of is excluded from the calculation of the average value of the integrated value of the detected phase difference, the same effect as the effect of the eighth aspect of the present invention can be obtained, and when the optical disc has a defect, It is possible to obtain an optical disk recording device capable of eliminating the influence.

According to the thirteenth aspect of the present invention described above, in the optical disc recording apparatus of the first aspect of the present invention, the drive pulse generation source is a pulse train type that generates a data pulse of a time width corresponding to the value of the input data. Since the intensity of the light beam from the recording light source is changed alternately into high and low by converting into the drive pulse and the pulse train type drive pulse, the same effect as the effect of the first present invention can be obtained. Thus, it is possible to obtain an optical disc recording device capable of forming a high quality optical recording trace on a recording track.

According to the fourteenth aspect of the present invention described above, in the optical disc recording apparatus of the second aspect of the present invention, the drive pulse generation source is a pulse train type that generates a data pulse having a time width corresponding to the value of the input data. Since the intensity of the light beam from the recording light source is alternately changed to high or low by converting into the drive pulse and the pulse train type drive pulse, the same effect as the effect of the second invention is obtained. Thus, it is possible to obtain an optical disc recording device capable of forming a high quality optical recording trace on a recording track.

According to the fifteenth invention described above, the fourteenth aspect
In the optical disc recording apparatus of the present invention, the period of time during which the intensity of the light beam of the drive pulse from the edge control means is increased based on the detected phase difference so that the detected phase difference from the phase comparison means becomes a predetermined value. Since the edge timing of the drive pulse is controlled by the edge control means so that the time width changes, it is possible to obtain an optical disk recording apparatus that can obtain the same effects as those of the fourteenth invention. .

According to the sixteenth invention described above, the thirteenth invention
In the optical disc recording apparatus according to the present invention, the reproduction light beam is obtained from the same light source as the recording light beam, and the photodetector by the phase comparison means is used within the non-signal period between the adjacent data pulses. Since the phase comparison is performed between the edge of the detection pulse from and the edge of the data pulse from the delay unit, the same effect as the effect of the thirteenth aspect of the present invention can be obtained, and the time corresponding to the value of the input data can be obtained. Since the width data pulse is a pulse train type drive pulse, the detection pulse from the photodetector is also affected by the pulse train type drive pulse, but the phase is changed in the non-signal period between adjacent data pulses. By performing a phase comparison between the edge of the detection pulse from the photodetector by the comparison means and the edge of the data pulse from the delay means, the optical disc It is possible to obtain an optical disk recording device capable of surely performing phase comparison between the edge of a detection pulse based on the edge of an optical recording trace formed on the recording track of the above and the edge of the data pulse from the delay means. it can.

According to the seventeenth invention described above, the fourteenth aspect
In the optical disc recording apparatus according to the present invention, the reproduction light beam is obtained from the same light source as the recording light beam, and the photodetector by the phase comparison means is used within the non-signal period between the adjacent data pulses. Since the phase comparison between the edge of the detection pulse from and the edge of the data pulse from the delay means is performed, the same effect as the effect of the fourteenth aspect of the present invention can be obtained, and the time corresponding to the value of the input data can be obtained. Since the width data pulse is a pulse train type drive pulse, the detection pulse from the photodetector is also affected by the pulse train type drive pulse, but the phase is changed in the non-signal period between adjacent data pulses. By performing a phase comparison between the edge of the detection pulse from the photodetector by the comparison means and the edge of the data pulse from the delay means, the optical disc It is possible to obtain an optical disk recording device capable of surely performing phase comparison between the edge of a detection pulse based on the edge of an optical recording trace formed on the recording track of the above and the edge of the data pulse from the delay means. it can.

According to the eighteenth invention described above, the fifteenth invention
In the optical disc recording apparatus according to the present invention, the reproduction light beam is obtained from the same light source as the recording light beam, and the photodetector by the phase comparison means is used within the non-signal period between the adjacent data pulses. Since the phase comparison between the edge of the detection pulse from and the edge of the data pulse from the delay means is performed, the same effect as the effect of the fifteenth aspect of the present invention can be obtained, and the time corresponding to the value of the input data can be obtained. Since the width data pulse is a pulse train type drive pulse, the detection pulse from the photodetector is also affected by the pulse train type drive pulse, but the phase is changed in the non-signal period between adjacent data pulses. By performing a phase comparison between the edge of the detection pulse from the photodetector by the comparison means and the edge of the data pulse from the delay means, the optical disc It is possible to obtain an optical disk recording device capable of surely performing phase comparison between the edge of a detection pulse based on the edge of an optical recording trace formed on the recording track of the above and the edge of the data pulse from the delay means. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an arrangement diagram showing a configuration example of an optical head of the embodiment.

FIG. 3 is a diagram showing an optical disc and a beam spot of the embodiment.

FIG. 4 is a diagram showing a photodetector of the embodiment.

FIG. 5 is a diagram showing an optical disc and a beam spot of the embodiment.

FIG. 6 is a waveform diagram showing waveforms of input and output pulse signals of the pulse train circuit of the embodiment.

FIG. 7 is a timing chart provided for explaining the operation of the embodiment.

FIG. 8 is a block diagram showing another embodiment of the present invention.

FIG. 9 is a waveform diagram showing waveforms of input and output pulse signals of the pulse train circuit according to the embodiment.

[Explanation of symbols]

 1 Input Terminal 2 Interface 3 Modulator 4 Clock Generator 5 Pulse Train Generator 6 Edge Shifter 7 Low Level Controller 8 High Level Controller 9 Changeover Switch 10 Drive Circuit 11 Optical Disk 12 Motor 13 Optical Head 14 Delay Device 15 High Pass Filter 16 Phase comparator 17 Selector 18 Integrator 19 High-pass filter 20 Demodulator 21 Interface 22 Output terminal

Claims (18)

[Claims] 1. A recording light source for generating a recording light beam for irradiating a recording track of an optical disc which is rotated at a constant linear velocity, and a irradiating portion for irradiating the recording light beam on the recording track, which is close to an irradiating portion of the recording light beam. From a portion of the optical disc for reproducing light source for generating a reproduction light beam for reproducing an optical recording trace by the recording light beam by irradiating a portion separated by a predetermined distance from the optical disc. An optical head including a photodetector for detecting a reflected light beam, a data pulse generation source for generating a data pulse having a time width corresponding to a value of input data, and the input data to the recording track based on the data pulse. A drive pulse generation source for generating a drive pulse for forming an optical recording trace having a length corresponding to the value of and supplying the drive pulse to the recording light source, and the predetermined distance. Delay means for delaying the data pulse by a time obtained by dividing by the linear velocity, and phase comparison means for comparing the edge of the detection pulse from the photodetector with the edge of the data pulse from the delay means. An optical disk recording characterized in that the level of the drive pulse from the drive pulse source is controlled based on the detected phase difference so that the detected phase difference from the phase comparison means becomes a predetermined value. apparatus. 2. A recording light source for generating a recording light beam for irradiating a recording track of an optical disk rotated at a constant linear velocity, and a irradiating portion for irradiating the recording light beam on the recording track, the irradiation portion being close to the recording light beam irradiating portion. From a portion of the optical disc for reproducing light source for generating a reproduction light beam for reproducing an optical recording trace by the recording light beam by irradiating a portion separated by a predetermined distance from the optical disc. An optical head including a photodetector for detecting a reflected light beam, a data pulse generation source for generating a data pulse having a time width corresponding to a value of input data, and the input data to the recording track based on the data pulse. Drive pulse generation source for generating a drive pulse for forming an optical recording trace having a length corresponding to the value of, and the edge timing of the drive pulse is variable. And an edge control means for supplying the recording light source with a drive pulse having a variable edge timing, and a delay means for delaying the data pulse by a time obtained by dividing the predetermined distance by the linear velocity. A phase comparison means for phase-comparing the edge of the detection pulse from the photodetector with the edge of the data pulse from the delay end stage; and the detection so that the detection phase difference from the phase comparison means has a predetermined value. An optical disk recording apparatus characterized in that the timing of the edge of the drive pulse from the edge control means is controlled based on the phase difference. 3. The optical disk recording apparatus according to claim 1, wherein the recording light beam and the reproduction light beam are irradiated to the center of the recording track in the width direction. Disk recording device. 4. The optical disc recording apparatus according to claim 2, wherein the recording light beam and the reproduction light beam are applied to the center of the recording track in the width direction. Disk recording device. 5. The optical disc recording apparatus according to claim 1, wherein the recording light beam is applied to the center of the recording track in the width direction, and a pair of the reproduction light beams are provided, It is arranged in front of and behind the recording light beam, and is displaced from the center of the recording track in the width direction by an amount equal to or less than 1/4 of the track pitch in the opposite direction.
An optical disk recording apparatus, wherein the pair of reproducing light beams are irradiated. 6. The optical disc recording apparatus according to claim 2, wherein the recording light beam is applied to the center of the recording track in the width direction, and a pair of the reproduction light beams are provided. It is arranged in front of and behind the recording light beam, and is displaced from the center of the recording track in the width direction by an amount equal to or less than 1/4 of the track pitch in the opposite direction.
An optical disk recording device characterized in that the pair of reproducing light beams are irradiated. 7. The optical disc recording apparatus according to claim 1, wherein the average value of the integrated values of the detected phase differences obtained by the phase comparison by the phase comparison means within a predetermined period becomes a predetermined value. An optical disk recording apparatus, wherein the level of a drive pulse from the drive pulse source is controlled based on an average value of integrated values of detected phase differences. 8. The optical disk recording apparatus according to claim 2, wherein the average value of the integrated values of the detected phase differences obtained by the phase comparison within the predetermined period by the phase comparison means becomes a predetermined value. An optical disk recording apparatus, wherein the edge timing of a drive pulse from the edge control means is controlled based on an average value of integrated values of detected phase differences. 9. The optical disc recording apparatus according to claim 1, wherein when the detected phase difference obtained by the phase comparison by the phase comparison means is outside a predetermined range, the drive pulse source based on the detected phase difference is used. An optical disk recording device, characterized in that the control of the level of the driving pulse is stopped. 10. The optical disc recording apparatus according to claim 2, wherein when the detected phase difference obtained by the phase comparison by the phase comparison means is out of a predetermined range, the edge control means based on the detected phase difference is used. An optical disk recording apparatus, characterized in that the control of the timing of the edge of the driving pulse is stopped. 11. The optical disc recording apparatus according to claim 7, wherein when the detected phase difference obtained by the phase comparison by the phase comparison means is outside a predetermined range, the detected phase difference outside the predetermined range is An optical disk recording apparatus, which is excluded from calculation of an average value of integrated values of detected phase differences. 12. The optical disc recording apparatus according to claim 8, wherein when the detected phase difference obtained by the phase comparison by the phase comparison means is outside a predetermined range, the detected phase difference outside the predetermined range is An optical disk recording apparatus, which is excluded from calculation of an average value of integrated values of detected phase differences. 13. The optical disc recording device according to claim 1, wherein the drive pulse generation source converts a data pulse having a time width corresponding to a value of the input data into a pulse train type drive pulse, An optical disk recording apparatus, wherein the intensity of a light beam from the recording light source is alternately changed to high or low by a pulse train type drive pulse. 14. The optical disk recording device according to claim 2, wherein the drive pulse generation source converts a data pulse having a time width corresponding to a value of the input data into a pulse train type drive pulse, An optical disk recording apparatus, wherein the intensity of a light beam from the recording light source is alternately changed to high or low by a pulse train type drive pulse. 15. The optical disk recording apparatus according to claim 14, wherein a drive pulse from the edge control means is based on the detected phase difference so that the detected phase difference from the phase comparison means becomes a predetermined value. 2. The optical disc recording apparatus, wherein the edge timing of the drive pulse is controlled by the edge control means so that the time width of the period in which the intensity of the light beam is increased changes. 16. The optical disc recording apparatus according to claim 13, wherein the reproducing light beam is obtained from the same light source as the recording light beam, and a non-signal period between the adjacent data pulses. In the optical disc recording apparatus, the phase comparison is performed between the edge of the detection pulse from the photodetector by the phase comparison means and the edge of the data pulse from the delay means. 17. The optical disc recording apparatus according to claim 14, wherein the reproducing light beam is obtained from the same light source as the recording light beam, and a non-signal period between adjacent data pulses is set. In the optical disc recording apparatus, the phase comparison is performed between the edge of the detection pulse from the photodetector by the phase comparison means and the edge of the data pulse from the delay means. 18. The optical disc recording apparatus according to claim 15, wherein the reproduction light beam is obtained from the same light source as the recording light beam, and a non-signal period between the adjacent data pulses. In the optical disc recording apparatus, the phase comparison is performed between the edge of the detection pulse from the photodetector by the phase comparison means and the edge of the data pulse from the delay means.