KR19990038764A - Method and device for recording media - Google Patents

Abstract

The present invention relates to a method and apparatus for driving a recording medium capable of driving a wobbled mountain / bone recording method at a variable speed.

The present invention provides a first step of detecting a wobble signal from a recording medium having tracks of hills and valleys that are wobbled at regular intervals and arranged adjacent to each other, and a second step of detecting a phase error signal by comparing the wobble signal with a reference signal in phase; A third step of integrating the phase error signal to any one of at least two time constants in response to the shift control command; and a fourth step of adjusting the period and phase of the reference signal in response to the integrated phase error signal; And a fifth step of recording information on the recording medium in response to the reference signal.

Description

Method and apparatus for driving record carrier

The present invention relates to a recording medium driving method and apparatus for driving a recording medium having a wobbled hill and valley track structure.

Recently, the demand for large capacity is increasing in the field of optical recording / reproducing or magneto-optical recording / reproducing. Accordingly, in a recording medium such as a DVD-RAM (Digital Versatile Disc-Random Access Memory), a so-called acid / gol recording method for recording information on both land and groove has been proposed. As an example of the recording medium of the mountain / valley recording method, as shown in FIG. 1, a sector defining a recording unit of information is formatted with address information for identifying a sector by the prepit column 10. FIG. And an optical disc having an identification information area (hereinafter referred to as an " ID ") area and a recording area in which user information such as audio and video is recorded. In this optical disc, the prepit row 10 is divided into a first pit row 10A used for the track of the mountain and a second pit row 10B used for the track of the hill, that is, two pit rows. It is formed at the boundary between the tracks (12, 14). These two pit rows 10A, 10B are read by the pick-up not only when the track 12 of the mountain is accessed but also when the track 14 of the goal is driven. Only one of the pit train signals read by the pickup is used by appropriate signal processing, and only the identification information corresponding to the track 12 or 14 of the hill or valley is used. Further, the recording area of the tracks 12 and 14 of the hills or valleys is bent to the same width and depth. This curved shape will be referred to as a "wobble part". The wobble unit 16 is read by the pickup during recording or playback, and the signal detected from the wobble unit 16 by the pickup (hereinafter referred to as the "wobble signal") is used for the rotation control of the optical disc and the recording channel clock control. Is used. The wobble signal is changed to a square wave by zero-crossing and logic for use in rotation control, recording channel clock control, and the like.

A recording medium access device which performs recording channel clock control and rotation control by using the wobble signal has compared the wobble signal by phase comparison and integrates the phase compared signal by an integrator. In addition, the recording medium access device is not only recording / reproducing the recording medium at a normal speed, but also has a trend of adding a search function that allows a user to search information stored on the recording medium at high speed. In this search function, the recording medium is rotated at high speed, and the frequency of the wobble signal is also increased as compared with normal recording / playback. Accordingly, the phase comparison signal of the wobble signal also changes rapidly.

However, since the time constant of the integrator integrating the phase comparison signal with respect to the wobble signal is fixed, the recording medium access device cannot generate the recording channel clock synchronized with the wobble signal during the search function and maintain the rotation speed at a constant speed. It becomes impossible. Therefore, there is a demand for a technique for stably accessing the recording medium even in the search mode in the recording medium access device.

Accordingly, an object of the present invention is to provide a recording medium driving method and apparatus capable of driving a wobbled mountain / bone recording method at a variable speed.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically shows an optical disc having a recording area made of tracks of hills and valleys and an ID area made of prepit rows.

Fig. 2 is a diagram schematically showing a recording medium recording apparatus according to an embodiment of the present invention.

3A and 3B are waveform diagrams of electrical signals output from the pickup in FIG.

FIG. 4 shows details of the edge detector in FIG. 2; FIG.

Fig. 5A is an input / output waveform diagram of each part shown in Fig. 4 when the track of the goal is accessed.

Fig. 5B is an input / output waveform diagram of each part shown in Fig. 4 when the mountain track is restrained.

FIG. 6 shows details of the filter controller in FIG. 2; FIG.

7 is an input / output waveform diagram of each part shown in FIG. 6;

FIG. 8 shows details of the envelope detector in FIG. 2; FIG.

Fig. 9 is an output waveform diagram of each part of the circuit shown in Fig. 8;

FIG. 10 shows details of the control integrator in FIG. 2; FIG.

<Description of Symbols for Main Parts of Drawings>

10: Prepit Row 12: Mountain Track

14: Track 16: Goal of the Goal

18: optical disc 20: pickup

22: limiter 24: control bandpass

26: slicer 28: edge detector

30: first phase comparator 32: control integrator

34: voltage controlled oscillator 36: first divider

38: recording signal processor 40: optical controller

42: oscillator 44: second divider

46: second phase comparator 48: integrator

50: motor drive part 52: spindle motor

54; Filter Controller 56: Envelope Detector

58: OR gate 60, 72: delay

62, 74: EOR gate 70, 92: amplifier

76: AND gate 80: comparator

90: adaptive integrator

In order to achieve the above objects, a recording medium driving method according to the present invention comprises a first step of detecting a wobble signal from a recording medium having wobble and valley tracks that are wobbled and arranged adjacent to each other, and a reference signal of a wobble signal. And a second step of detecting a phase error signal in comparison with a phase, and a third step of driving the recording medium at a driving speed by any one of at least two time constants in response to the phase error signal in response to a shift control command. do.

A method of driving a recording medium according to the present invention comprises a first step of detecting a wobble signal from a recording medium having wobble and valley tracks that are wobbled at regular intervals and arranged adjacent to each other; A second step of detecting the phase error signal, a third step of driving the recording medium at a driving speed by any one of at least two time constants in response to the shift control command, and a response to the integrated phase error signal; And a fourth step of adjusting the period and phase of the reference signal and a fifth step of recording information on the recording medium in response to the reference signal.

The recording medium driving method according to the present invention generates a first step of detecting a wobble signal from a recording medium having tracks of hills and valleys that are wobbled at regular intervals and arranged adjacent to each other, and generates a first reference signal indicating a reference traveling speed of the tracks. And a third step of detecting the phase error signal by comparing the wobble signal with the second reference signal in phase, and integrating the phase error signal into any one of at least two time constants in response to the shift control command. And a fifth step of varying the period and phase of the second reference signal in response to the integrated phase error signal, and a sixth step of detecting the rotation speed error amount by comparing the first and second reference signals. And a seventh step of adjusting the rotational speed of the recording medium in response to the rotational speed error amount.

According to an aspect of the present invention, a recording medium driving apparatus includes wobble signal detection means for detecting a wobble signal from a recording medium having wobble and valley tracks arranged at adjacent intervals, and a phase error signal by comparing the wobble signal with a reference signal in phase. And phase driving means for driving the recording medium at a driving speed of at least two of the time constants in response to the shift control command.

The recording medium driving apparatus according to the present invention includes wobble signal detection means for detecting a wobble signal from a record medium having wobble and valley tracks arranged at adjacent intervals and a wobble signal from the wobble signal detection means. Phase comparing means for detecting a phase error signal by comparing the phases, control integrating means for integrating the phase error signal from the phase comparing means into any one of at least two time constants in response to a shift control command, and control integrating means And oscillation means for varying the reference signal in response to the phase error signal integrated by the signal, and information processing means for processing information recorded on the recording medium in response to the reference signal from the oscillation means.

The recording medium driving apparatus according to the present invention comprises wobble signal detecting means for detecting a wobble signal from a recording medium having wobble and arranged tracks adjacent to each other at regular intervals, and a first reference signal indicating a reference traveling speed of the tracks. One of at least two time constants in response to a shift control command; and a reference running speed generating means, a phase comparing means for detecting a phase error signal by comparing a wobble signal with a second reference signal, and a phase error signal in response to a shift control command. A control integrating means for integrating with a number, an oscillating means for varying the period and phase of the second reference signal in response to the integrated phase error signal, and a rotation for comparing the first and second reference signals to detect the rotational speed error amount Speed error amount detecting means and rotation speed adjusting means for adjusting the rotation speed of the recording medium in response to the rotation speed error amount.

Other objects and advantages of the present invention other than the above object will become apparent from the description of the embodiments of the present invention with reference to the accompanying drawings.

Hereinafter, with reference to Figures 2 to 10 attached to an embodiment of the present invention will be described in detail.

2 shows a recording medium recording apparatus according to an embodiment of the present invention for recording user information on an optical disc of a mountain / gol recording method. Referring to FIG. 2, the recording medium recording apparatus includes a limiter 22, a control band filter 24, a slicer 26, and an edge detector connected in series with a pick-up 20. FIG. Dtector 28). The pickup 20 irradiates a light beam to the optical / disk recording type 18 as shown in FIG. 1 and converts the amount of reflected light reflected by the optical disk 18 into an electrical signal. The electrical signal generated by the pickup 20 has a waveform as shown in FIGS. 3A and 3B. 3A is an electrical signal generated at the pickup 20 when the light beam is irradiated to the track 12 of the mountain and FIG. 3B is an electrical signal generated at the pickup 20 when the light beam is irradiated to the track 14 of the valley. It is a signal. The electrical signal of FIG. 3A and the electrical signal of FIG. 3B have inverted phases. 3A and 3B, the pit string signal 21 is distributed at the high or low voltage level of the wobble signal 23. FIG. The wobble signal 23 includes an information signal (not shown) of a high frequency component when user information is recorded on the tracks 12 and 14 of the hill or valley. The electric signal is limited by the limiter 22, so that the pit string signal 21 is removed. At this time, the output signal of the limiter 22 may include only the wobble signal 23 or may include an information signal together with the wobble signal. The control band filter 24 detects a wobble signal distributed in a predetermined frequency band by removing an information signal of a high frequency component that may be included in the output signal of the limiter 22. The wobble signal detected by the bandpass filter 24 has an opposite phase depending on which of the mountain track 12 and the valley track 14 is driven. Further, the wobble signal is subjected to level slicing and logic by the slicer 26 to be waveform-shaped in a square wave form. The edge detector 28 detects the rising and falling edges of the waveform-formed wobble signal from the slicer 26 and generates an edge detection pulse in which pulses of a specific logic are located at each of the rising and falling edges of the wobble signal. do. To this end, the edge detector 28 may be configured as shown in FIG. 4, which will be described later with reference to FIG. 4.

The edge detector 28 is cascaded with a first phase comparator 30, a control integrator 32, and a voltage controlled oscillator 34 (hereinafter referred to as " VCO ") 34, in phase with the VCO 34. The first divider 36 is connected between the comparators 30. The first phase comparator 30 compares the phases of the edge detection pulses from the edge detector 28 and the clock signal from the first divider 36 to provide a phase error signal having a voltage level that varies according to the phase difference. Will occur. This phase error signal is integrated by the control integrator 32. The control volume branch 32 performs the integration and hold operation according to the logic value of the integration control signal ICS. In detail, the control integrator 32 integrates the phase error signal from the first phase comparator 30 during the period of the electrical signal enhancement envelope signal, that is, during the period in which the light beam is located in the recording area which is the track of the mountain or valley. The integrated phase error signal is supplied to the VCO 34. On the contrary, during the period of the pit string signal of the electrical signal, that is, during the period in which the light beam is located in the ID area of the prepit row 10, the control integrator 32 holds the phase error signal integrated in the period of the envelope signal. Then, the held phase error signal is supplied to the VCO 34. That is, the control integrator 32 supplies the phase error signal detected in the period of the wobble signal to the VCO 34 even during the period in which the pit string signal is detected instead of the wobble signal. In addition, the control integrator 32 integrates the phase error signal at different speeds in accordance with the logic value of the mode control signal MCS. In detail, the control integrator 320 speeds up the response speed of the integrated phase error signal by quickly integrating the phase error signal when the mode control signal MCS maintains a high logic indicating the search mode. When the MCS) maintains the high logic indicating the normal recording / playback mode, the control integrator 32 maintains the response speed of the integrated phase error signal at the normal speed by integrating the phase error signal at the normal speed. The VCO 34 responding to the integrated phase error signal from (32) adjusts the oscillation period according to the voltage level of the integrated phase error signal to obtain a channel bit clock (SCLK) having the same phase and frequency as the edge detection pulse. This channel bit clock (SCLK) is supplied to the recording signal processor 38 to adjust the recording speed of the user information recorded on the optical disc 18. The channel bit clock SCLK is varied according to the rotational speed of the optical disk 18, thereby maintaining a constant recording density of the optical disk.The recording signal processor 38 requests user information from the optical disk 18. The channel bit sequence is converted into a channel bit sequence in the form of a channel, and the channel bit sequence is transmitted to the optical controller 40 in accordance with the channel bit clock SCLK from the VCO 34. The optical controller 40 is a recording signal processor 38. The user information is recorded on the tracks 12 and 14 of the hills or valleys of the optical disc 18 by interrupting the light source included in the pickup 20 in accordance with the logical value of the channel bit string from the first divider. 36 divides the channel bit clock SCLK from the VCO 34 into a first predetermined constant (for example, 93) and supplies the divided channel bit clock to the first phase comparator 30.

In addition, the recording medium recording apparatus further includes a second divider 44, a second phase comparator 46, an integrator 48, a motor driver 50, and a spindle motor 52, which are connected to the oscillator 42 dependently. It is provided with. The oscillator 42 generates an oscillation signal having a constant frequency. The oscillation signal is divided into a second predetermined number by the second divider 44 and supplied to the second phase comparator 46 as a reference signal. The second phase comparator 46 detects a phase difference between the divided oscillation signal from the second divider 44 and the divided channel bit clock from the first divider 36 and has a voltage corresponding to the phase difference. The two-phase error signal is generated. The second phase error signal is integrated by the integrator 48 and supplied to the motor drive unit 50 as the rotation error signal Cmo. Then, the motor driving unit 50 maintains a constant rotation speed of the optical disc 18 by accelerating and decelerating the rotation speed of the spindle motor 52 according to the voltage level of the rotation error signal Cmo from the integrator 48. .

The control band filter 24 is connected to a filter controller 54 in response to the area discrimination signal RIS. The filter controller 54 detects the frequency of the area discrimination signal RIS and generates a band control signal BCS having a voltage level that varies according to the detected frequency. The band control signal BCS has a lower voltage level as the frequency of the region discrimination signal RIS increases, and a higher voltage level as a frequency of the region discrimination signal RIS decreases. Further, the band control signal BCS is moved by the filtering frequency band of the control band filter 24 so that the wobble signal WS is generated by the control band filter 24 even when the rotational speed of the optical disc 18 is out of the reference speed. To be detected correctly. In order to generate the band control signal BCS, the filter controller 54 may be configured as shown in FIG. 6, which will be described later.

Further, the recording medium recording apparatus includes an inverter INV for inputting the area discrimination signal RIS, an envelope detector 56 for inputting an output signal of the control band filter 24, and an output signal of the envelope detector 56. And an OR gate 58 for inputting an output signal of the inverter INV. The inverter INV inverts the area discrimination signal RIS and supplies the inverted area discrimination signal to the OR gate 58. The envelope detector 56 detects whether the wobble signal WS is present from the control band filter 24, and if the wobble signal WS is present, the high logic and the low detection logic signal of the envelope detection signal have low logic. Will occur. The envelope detection signal EDS has low logic when the ID region of the prepit column is accessed and when the portion of the tracks 12 and 14 of the hill and valley where the wobble signal is removed by the defect is accessed. In order to generate the envelope detection signal, the envelope detector 56 may be configured as shown in FIG. 8, which will be described later. The OR gate 58 OR-operates the inverted area discrimination signal from the inverter INV and the envelope detection signal from the envelope detector 56 to generate an integral control signal. This integral control signal is kept low logic when the ID area of the optical disc 18 is accessed or when the portion of the track of the hill and valley where the wobble signal is removed by the defect is accessed. By this integration control signal, the control integrator 32 integrates the first phase error signal from the phase comparator 30 only when the wobble signal is detected by the control band filter 24. The control integrator 32 also holds the integrated first phase error signal when the wobbled portion of the tracks 12 and 14 of the ID area and the hill and valley is accessed. Accordingly, the VCO 34 can stably generate the recording channel clock even when the ID area is accessed and the track of the hill and the valley without the wobble portion is accessed. As a result, recording of information proceeds stably, and the optical disc 18 is rotated at a constant speed.

4 shows details of the edge detector 28 in FIG. In FIG. 4, the edge detector 28 has a first delay unit 60 and a first exclusive ora gate (1) which commonly input the waveform-shaped wobble signal WS from the slicer 26 in FIG. Exclusive OR Gate: hereinafter referred to as "EOX gate". The first delay unit 60 delays the wobble signal WS by a predetermined time and supplies the delayed wobble signal DWS to the EOX gate 62. The first EOX gate 62 changes the output logic value depending on whether the logic value of the wobble signal WS from the slicer 26 and the delayed wobble signal DWS from the first delay unit 60 are the same or not. Let's do it. In detail, the first EOX gate 62 generates a logic value of “1” when the logic values of both input signals are reversed when the logic values of both input signals are the same. By this operation, the edge detection pulse EDP having a width corresponding to the delay amount of the first delay unit 60 is generated at each edge of the wobble signal WS in the first EOX gate 62. The edge detection pulse EDP has twice the frequency of the wobble signal WS. Accordingly, the edge detection pulse EDP always has the same phase even if the phase of the wobble signal WS is inverted, i.e., either of the peak and valley tracks are accessed. This fact is clearly illustrated by Figs. 5A and 5B. Fig. 5A shows the waveforms of the wobble signal WS _G , the delayed wobble signal DWS _G and the edge detection pulse EDP when the track 14 of the goal is accessed, and Fig. 5B shows that the peak track 12 is accessed. In this case, waveforms of the wobble signal WS _L , the delayed wobble signal DWS _L and the edge detection pulse EDP are shown. 5A and 5B, even though the two wobble signals WS _G and WS _L have phases opposite to each other, it can be seen that the edge detection pulses EDP have the same phase. Accordingly, by using the edge detection pulse (EDP) having the same phase regardless of mountain / goal tracks in the aforementioned channel bit clock (SCLK) generation and disc rotation control, stable control is performed regardless of which mountain / goal is accessed. can do.

FIG. 6 shows an embodiment of the filter controller 54 shown in FIG. 2 in detail. In Fig. 6, the filter controller 54 detects the length of every recording area in the area discrimination signal and generates a band control signal having a voltage level corresponding to the length of the recording area. To this end, the filter controller 54 is connected in parallel between the first resistor R1 connected between the supply voltage source VCC and the first node 73 and between the first node 73 and the base voltage source GND. A first control switch SW1 and a first capacitor C1 are provided. The first capacitor C1 charges the supply voltage VCC from the input line 73. The first resistor R1 determines the rate at which the voltage is charged in the first capacitor C1. It appears on the voltage signal first node 73 charged in the first capacitor C1. The first control switch SW1 discharges the voltage charged in the first capacitor C1 by connecting the first node 73 to the ground voltage source GND when it is turned on. That is, the first control switch SW1 has a function of periodically initializing the first capacitor C1. The longer the period during which the first control switch SW1 is turned off, that is, the longer the period during which the recording area is accessed, the higher the voltage signal V73 is generated in the first node 73.

In addition, the filter controller 54 includes the second control switch SW2 and the second resistor R2 connected in series between the first node 73 and the second node 75, the second node 75 and the base. A second capacitor C2 connected between the voltage source GND and an amplifier 70 connected between the second node 75 and the output line 77 are further provided. When the second control switch SW2 is turned on, the second control switch SW2 transmits the voltage signal V73 on the first node 73 to the second node 75 via the second resistor R2. The second resistor R2 and the second capacitor C2 filter the voltage signal V73 on the first node 73 which is input via the second control switch SW2 and the second resistor R2. Hold. In detail, when the second control switch SW2 is turned on, the second capacitor C2 is connected from the first node 73 to the second control switch SW2, the second resistor R2, and the second node. The high frequency component is removed by accumulating the voltage signal V73 input via 75). In addition, the second capacitor C2 supplies the accumulated voltage to the amplifier 70 via the second node 75 in the period when the second control switch SW2 is turned off. The amplifier 70 amplifies the voltage signal V75 on the second node 75 and supplies the amplified voltage signal to the control band filter 24 shown in FIG. 2 as the band control signal BCS. Then, the control band filter 24 sets the center frequency of the filtering frequency band higher as the voltage level of the band control signal BCS is lower and detects only the electrical signal of the set filtering frequency band. As a result, the control bandpass filter 24 can detect the wobble signal even if the frequency of the wobble signal changes, that is, even if the rotational speed of the optical disc 18 changes.

Finally, a second delay unit 72, a second EOX gate 74, and an AND gate 76 are further provided to commonly input the region discrimination signal RIS from the input line 71. The area discrimination signal RIS is low in a period in which high logic is drawn in the period in which the ID area having the pit train 10 is accessed as shown in Fig. 7, and the recording area in the tracks 12 and 14 of the hill and valley is accessed. Maintain logic The second delay unit 72 delays the region discrimination signal RIS for a predetermined period and supplies the delayed region discrimination signal DRIS to the first control switch SW1 and the second EOX gate 74. The first control switch SW1 is turned on during the period in which the delayed region discrimination signal DRIS maintains high logic to discharge the voltage signal V73 charged in the first capacitor C1 toward the base voltage. As the first control switch SW1 is switched by the delayed area discrimination signal DRIS, the voltage signal V73 shown in FIG. 7 appears on the first node 73. The second EOX gate 74 compares the logic value of the area discrimination signal RIS from the control line 73 and the delayed area discrimination signal DRIS from the second delay unit 72 to determine the area discrimination signal RIS. Detect rising and falling edges. The second EOX gate 74 generates edge pulses having a width corresponding to a delay time at the rising and falling edges of the region discrimination signal RIS. The AND gate 76 detects rising edge pulses by performing an AND operation on the edge pulses and the area discrimination signal RIS from the second EOX gate 74, and applies the detected rising edge pulses as a switching control signal SWC. 2 is supplied to the control switch SW2. The second control switch SW2 responds to the switching control signal SWC from the AND gate 76 only during the period corresponding to the delay time of the second delay unit 72 from the start of the ID region. The voltage signal V73 on the 73 is transmitted to the second node 75. As a result, the second capacitor C2 inputs the voltage signal V73 on the first node 73 during the period corresponding to the delay time of the second delay unit 72 from the start of the ID area to start the next ID area. Will be maintained until that point. The integrated signal V75 as shown in FIG. 7 is displayed on the second node 75 by the second capacitor C2.

FIG. 8 shows an embodiment of the envelope detector 56 in FIG. 2 in detail. In FIG. 8, the envelope detector 56 has first and second diodes D1 and D2 which commonly input the wobble signal WS as shown in FIG. 9 from the input line 81. In FIG. The first diode D1 and the second diode D2 half-wave rectify the wobble signal WS. The wobble signal half-wave rectified by the first diode D1 is supplied to the third node 83, and the wobble signal half-wave rectified by the second diode D2 is supplied to the fourth node 85.

In addition, the envelope detector 56 is connected in series between the third node 83 and the ground voltage source GND, and includes a third resistor R3 and a third capacitor C3, a fourth node 85, and a comparator 80. Fourth resistor (R4) connected between inverting terminal (-) of (), fourth capacitor (C4) and fifth resistor connected in parallel between inverting terminal (-) and ground voltage source (GND) of comparator 80 (R5) is further provided. The third resistor R3 and the third capacitor C3 constituting the first RC integrator integrate the wobble signal half-wave rectified by the first diode D1 and integrate the signal (hereinafter, referred to as “first integrated signal FIS”). Is supplied to the non-inverting terminal (+) of the comparator 80. The fourth and fifth resistor lamps R4 and R5 and the fourth capacitor C4 also constitute a second RC integrator, and divide and integrate the wobble signal half-wave rectified by the second diode D2. The signal (hereinafter referred to as "second integral signal SIS") is supplied to the inverting terminal (-) of the comparator 80. In order for the first integrated signal FIS to respond to the wobble signal WS much faster than the second integrated signal SIS, the time constant R3 × C3 of the first RC integrator is C4 (R4 / It is set much smaller than (R4 + R5))). The time constant C4 (R4 / (R4 + R5)) of the second RC integrator is set to be substantially equal to the period value of the wobble signal so that the second integrated signal SIS hardly changes. Accordingly, the first integrated signal FIS drops rapidly as shown in FIG. 9 when the wobble signal WS is temporarily absent due to a defect on the optical disk 18. On the other hand, the second integrated signal SIS has a constant voltage even if the wobble signal WS is temporarily absent.

As a result, the second integrated signal SIS has a higher voltage level than the first integrated signal FIS when the wobble signal WS is temporarily absent. Then, the comparator 80 generates the envelope detection signal EDS as shown in FIG. 9 by comparing the first and second integrated signals FIS and SIS. The envelope detection signal EDS is supplied to the control integrator 32 via the OR gate 58 of FIG. 2 so that the control integrator 32 causes the wobble signal WS at the tracks 12 and 14 of the hill and valley due to a defect. Is performed in a period in which no) is detected. As a result, the recording channel clock SCLK is generated stably, and the rotational speed error signal is accurately detected.

FIG. 10 shows in detail the control integrator 32 as in FIG. In FIG. 10, the control integrator 32 includes a third control switch SW3, a fourth control switch SW4, an adaptive integrator 90, and an amplifier 92 connected in series with the input line 91. The third control switch SW3 switches the phase error signal to be transmitted from the input line 91 to the fourth control switch SW4 in response to the integral control signal ICS from the first control line 93. In detail, the third control switch SW3 is turned on only when the integral control signal ICS maintains high logic, that is, when the wobble signal is detected from the optical disk 18, so that the phase error signal is switched to the fourth control switch. To be supplied to (SW4). The fourth control switch SW4 sends a phase error signal from the third control switch SW3 to either of the fifth node 97 and the sixth node 99 in response to the second mode control signal MCS. send. In detail, the fourth control switch SW4 sends the phase error signal from the third control switch SW3 to the fifth node 97 when the mode control signal MCS maintains the high logic indicating the search mode. When the mode control signal MCS has a low logic indicating the normal recording / reproducing mode, the phase error signal from the third control switch SW3 is transmitted to the sixth node 99. The adaptive integrator 90 responds to the phase error signal at different speeds according to the switching state of the fourth control switch SW4. That is, the adaptive integrator 90 integrates the phase error signal at a high speed when the phase error signal is input to the fifth node 97 and normal speed when the phase error signal is input to the sixth node 97. The phase error signal is integrated. The integration operation of the adaptive integrator 90 is to be performed only during the period in which the third control switch SW3 is turned on, that is, during the period in which the wobble signal is detected from the optical disk. On the other hand, in the period in which the third control switch SW3 is turned off (that is, in a period in which no wobble signal is detected from the optical disk), the adaptive integrator 90 integrates in the period in which the third control switch SW3 is turned on. Maintain the voltage signal. To this end, the adaptive integrator 90 includes a sixth resistor R6 connected between the fifth and seventh nodes 97 and 100, and a seventh connected between the sixth and seventh nodes 99 and 101. And a fifth capacitor C5 connected between the resistor R7 and the seventh node 101 and the ground voltage source GND. The fifth capacitor C5 forms an integrator having a time constant of " R6 × C5 " together with the sixth resistor R6 when the fourth control switch SW4 is connected to the fifth node 97. When the fourth control switch SW4 is connected to the sixth node 99, the fourth control switch SW4 has a time constant having a time constant of "R7 x C5" together with the seventh resistor R7. The sixth resistor R6 includes the seventh resistor R to increase the charge / discharge speed of the fifth capacitor C5 when the phase error signal is supplied to the fifth node 97 than when the phase error signal is supplied to the sixth node 99. It has a smaller resistance value than R7). The adaptive integrator 90 configured as described above operates as shown in Table 1 according to the switching states of the third and fourth control switches SW3 and SW4.

TABLE 1

The amplifier 92 supplies the phase error signal integrated by the adaptive integrator 90 from the seventh node 101 to the VCO 34 in FIG. 2 via the output line 103.

As described above, the recording medium recording apparatus according to the present invention can accurately detect the wobble signal by detecting the frequency band of 4 from the area discrimination signal and changing the filtering frequency band of the bandpass filter to the detected frequency band. Accordingly, in the present invention, the wobble signal can be accurately detected even if the rotational speed of the disc deviates from the reference speed, so that the recording operation and the control of the rotational speed are stably performed.

In addition, in the present invention, by detecting the presence or absence of the wobble signal by the envelope detector, the recording channel clock and the rotation speed error are detected using the wobble signal previously detected during the period in which the wobble signal is not read due to the defect. As a result, in the present invention, the recording operation and the rotational speed control are stably performed even if the wobble signal is not temporarily detected by the defect of the optical disc.

Furthermore, in the recording medium recording apparatus according to the present invention, the wobble signal is stably detected from the wobble signal of the track of the mountain and the valley without the mountain / valley discrimination information, so that the rotation speed of the optical disc can be accurately detected. Accordingly, the recording medium recording apparatus according to the present invention can stably maintain the rotational speed of the optical disc even if the tracks of the accessible hills and valleys are frequently changed.

As described above, the recording medium recording apparatus of FIG. 2 has been described as an embodiment of the present invention, but a person skilled in the art knows that the present invention can be applied to a recording medium reproducing apparatus and a recording medium reproducing and reproducing apparatus. Could be.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (17)

A first step of detecting a wobble signal from a recording medium having wobble and constant tracks of hills and valleys arranged at regular intervals; A second step of detecting a phase error signal in phase comparison with a reference signal of the wobble signal; And driving the recording medium at a driving speed by any one of at least two time constants in response to the phase error signal in response to a shift control command. The method of claim 1, And the wobble portion on which the wobble is formed is intermittently formed. A first step of detecting a wobble signal from a recording medium having wobble and constant tracks of hills and valleys arranged at regular intervals; A second step of detecting a phase error signal in phase comparison with a reference signal of the wobble signal; A third step of driving the recording medium at a driving speed by any one of at least two time constants in response to the phase error signal in response to a shift control command; Adjusting a period and a phase of the reference signal in response to an integrated phase error signal; And a fifth step of recording information on the recording medium in response to the reference signal. The method of claim 3, Selectively filtering the wobble signal from the recording medium into another frequency band in the first step; Level slicing the wobble signal to shape a square wave; And detecting an edge at which a logic value is changed in the square wave signal. The method of claim 3, The first step may include delaying the wobble signal by a predetermined delay time; And generating an edge detection signal having a width corresponding to a delayed amount of the delayed wobble signal for each edge of which the logic value of the wobble signal changes. The method of claim 3, And in the third step, the time constant is varied according to the shift control command for maintaining a specific logic in a search mode and a normal recording / reproducing mode. The method of claim 3, And the phase error signal integrated in the third step is held if the wobbling signal is not detected. A first step of detecting a wobble signal from a recording medium having wobble and constant tracks of hills and valleys arranged at regular intervals; A second step of generating a first reference signal representing a reference traveling speed of the tracks; A third step of detecting a phase error signal by comparing the wobble signal with a second reference signal in phase; Integrating the phase error signal to any one of at least two time constants in response to a shift control command; A fifth step of varying a period and a phase of the second reference signal in response to an integrated phase error signal; A sixth step of detecting a rotation speed error amount by comparing the first and second reference signals; And a seventh step of adjusting the rotation speed of the recording medium in response to the rotation speed error amount. Wobble signal detection means for detecting a wobble signal from a recording medium having wobble and a track of a hill and a valley arranged adjacent to each other at regular intervals; Phase comparison means for detecting a phase error signal by comparing the wobble signal with a phase signal; And driving means for driving said recording medium at least two or more in response to said phase error signal in response to a shift control command at a driving speed of any one of time constants. The method of claim 9, And the recording medium has a track structure in which the wobble portion on which the wobble is formed is formed intermittently. Wobble signal detection means for detecting a wobble signal from a recording medium having wobble and a track of a hill and a valley arranged adjacent to each other at regular intervals; Phase comparison means for detecting a phase error signal by comparing the wobble signal from the wobble signal detection means with a reference signal; Control integrating means for integrating a phase error signal from said phase comparing means to any one of at least two time constants in response to a shift control command; Oscillating means for varying the reference signal in response to a phase error signal integrated by the control integrating means; And information processing means for processing information recorded on the recording medium in response to the reference signal from the oscillation means. The method of claim 11, The wobble signal detecting means includes filtering means for selectively filtering the wobble signal from the recording medium into another frequency band; Slicing means connected to the filtering means for level slicing the wobble signal to be shaped into a square wave shape; And edge detecting means connected to said slicing means for detecting an edge of which the logic value changes in the spherical plate-shaped signal. The method of claim 11, The wobble signal detecting means includes delay means for delaying the wobble signal by a predetermined delay time; And an edge detection signal generation means connected to the slicing means and the delay means for generating an edge detection signal having a width corresponding to the delayed amount of the delayed wobble signal for each edge of which the logic value of the wobble signal changes. A recording medium drive device. The method of claim 11, And the wobble signal detecting means comprises filtering control means connected to the filtering means to move the frequency band for filtering in response to the wobble signal. The method of claim 11, And said control integrating means varies said time constant in accordance with said shift control command for maintaining a particular logic in a search mode and a normal recording / reproducing mode. The method according to claim 11 or 14, The integrating means includes first switching means for switching a signal path in accordance with the presence or absence of the wobble signal; And a time constant variable means connected to said first switching means for varying a time constant in accordance with said search mode and a normal recording / reproducing mode. Wobble signal detection means for detecting a wobble signal from a recording medium having wobble and a track of a hill and a valley arranged adjacent to each other at regular intervals; Reference driving speed generating means for generating a first reference signal representing a reference driving speed of the tracks; Phase comparing means for detecting a phase error signal by comparing the wobble signal with a second reference signal; Control integrating means for integrating the phase error signal to any one of at least two time constants in response to a shift control command; Oscillating means for varying the period and phase of the second reference signal in response to an integrated phase error signal; A rotation speed error amount detecting means for comparing the first and second reference signals to detect a rotation speed error amount; And a rotation speed adjusting means for adjusting the rotation speed of the recording medium in response to the rotation speed error amount.