JP2008198291A - Optical disk device and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk device capable of reducing current consumption even in a standby state where a laser beam is made to follow the information recording surface of an optical disk, and its control method. <P>SOLUTION: A laser beam is made to follow a land area b1 which is a middle area between the first groove area a1 of an optical disk 1 and a second groove area a2 adjacent to the first groove area a1 during a predetermined period when information is neither recorded nor reproduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus that performs at least one of recording and reproduction of information on an optical disc and a control method thereof.

  A standby state in a conventional optical disc apparatus will be described.

  When an optical disk is loaded in the optical disk device, the optical disk device starts a startup process. In this start-up process, various learnings are performed for rotating the loaded optical disk and optimally recording or reproducing information on the optical disk. For example, in order to optimally form a mark for indicating information on the optical disc or servo learning, which is a learning for tracking control in which the laser beam focused by the objective lens follows the information track on the information recording surface of the rotating optical disc. In addition, there is record learning for learning the power and timing for emitting laser light.

  In a conventional optical disc apparatus, when the learning process is completed and the start-up process is completed, information is recorded from the host device in a servo state in which the laser beam follows the information track on the information recording surface of the optical disc. And waiting for the arrival of commands such as playback. In addition, even when recording or playback in accordance with a command from the host device is completed, information is recorded or played back from the host device in a servo state in which the laser beam follows the information track on the information recording surface of the optical disc. It was in a waiting state waiting for the arrival of commands such as.

Conventionally, in the servo system that is stopped in the standby state, there is one that reduces the power consumption by rotating the spindle motor that consumes a large amount of power at startup at a predetermined speed without stopping (for example, (See Patent Document 1).
Japanese Patent Laid-Open No. 08-203205

  However, the above-described conventional optical disk apparatus has the following problems.

  In other words, when the laser beam is made to follow the information track in the standby state, a high-frequency component is mixed in the tracking error signal and the servo error signal that is the focus error signal, so this mixed high-frequency component is amplified in the actuator that drives the objective lens. Unnecessary drive current was supplied.

  Hereinafter, a tracking error signal among servo error signals will be described as an example with reference to FIG.

  FIG. 14 shows each signal in the conventional optical disc apparatus. 14A shows an RF signal, FIG. 14B shows a tracking error signal, and FIG. 14C shows a tracking drive signal.

  The RF signal shown in FIG. 14A indicates a change in brightness of reflected light from the optical disc. For example, CD-ROMs, DVD-ROMs, etc. have pits as recording marks formed on information tracks, and the level of reflected light changes when the laser beam emitted from the objective lens passes through the pits. And represents the recorded information. The optical disk device reproduces information recorded on the optical disk 1 by decoding the RF signal. Since the tracking error signal shown in FIG. 14B is generated from the reflected light from the optical disk, not a few RF signal components are mixed in the tracking error signal.

  When the information track is caused to follow the information track in the standby state, a high-frequency RF signal component generated by the presence or absence of the mark on the information track is mixed in the tracking error signal. Since the tracking drive signal shown in FIG. 14C is generated by amplifying the tracking error signal, if the RF signal component is mixed in the tracking error signal, the tracking drive signal corresponding to the current for driving the objective lens. The signal is amplified even to the mixed high frequency component, and a driving current unnecessary for driving the objective lens is supplied to the actuator that drives the objective lens.

  Accordingly, the present invention has been made in view of the above problems, and an optical disc apparatus capable of reducing current consumption even in a standby state in which a laser beam follows the information recording surface of an optical disc, and its control. It aims to provide a method.

  The present invention has been made to solve the above-described problems, and is a first information track of an optical disc and a second information track adjacent to the first information track for a predetermined period in which no information is recorded or reproduced. The laser beam is made to follow the intermediate region.

  With the above configuration, the present invention makes it possible to generate unnecessary drive current supplied to the actuator that drives the objective lens by reducing the mixing of high-frequency components into the servo error signal by causing the laser beam to follow the markless portion of the optical disk. Therefore, the current consumption of the optical disk device can be reduced.

  In order to solve the above problem, an optical disc apparatus according to claim 1 generates a tracking error signal based on an objective lens for condensing laser light for recording and reproducing information on the optical disc, and reflected light from the optical disc. A signal processing unit, a servo processing unit that generates a tracking drive signal for driving the objective lens in the tracking direction based on the tracking error signal, and a laser beam that is collected by the objective lens by controlling the servo processing unit is information on the optical disk. A control unit that follows the track, and the control unit includes a first information track on the optical disc and a second information track adjacent to the first information track for a predetermined period in which no information is recorded or reproduced. The laser beam is made to follow the intermediate region.

  According to the present invention, the laser beam is caused to follow an intermediate area between the first information track of the optical disc and the second information track adjacent to the first information track for a predetermined period in which no information is recorded or reproduced. By suppressing the generation of unnecessary drive current supplied to the actuator that drives the objective lens by reducing the mixing of high-frequency components into the servo error signal by causing the laser beam to follow the unmarked portion of the optical disk, The current consumption of the optical disk device can be reduced.

  According to a second aspect of the present invention, in the optical disc apparatus of the first aspect, the control unit reverses the polarity of the tracking error signal for a predetermined period during which no information is recorded or reproduced. The laser beam is caused to follow.

  Therefore, the present invention makes the tracking error signal have a positive / negative polarity by causing the laser beam to follow the intermediate region by reversing the polarity of the tracking error signal for a predetermined period when information is not recorded or reproduced. The radial position where the slope of the tangent line of the tracking error signal waveform is negative and the signal output is zero indicates the center of the intermediate area between the information track and the adjacent information track on the optical disc, and the objective lens is Since it is driven toward the center of the intermediate area, the laser beam can follow the intermediate area between the information tracks with a very simple configuration.

  According to a third aspect of the present invention, there is provided the optical disc apparatus according to the first aspect, wherein the control unit reverses the polarity of the tracking error signal for a predetermined period during which no information is recorded or reproduced. When a new command for recording or reproducing information arrives from a host device connected to the optical disk device during a predetermined period, the polarity of the tracking error signal is reversed again.

  According to the present invention, the host device connected to the optical disc apparatus is made to follow the laser beam in the intermediate area by reversing the polarity of the tracking error signal for a predetermined period during which no information is recorded or reproduced, and during the predetermined period. When a new command for recording or reproducing information is received from, if the polarity of the tracking error signal is inverted again during a predetermined period by inverting the polarity of the tracking error signal again, the waveform of the tracking error signal becomes positive or negative. Since the negative polarity is reversed again, the state returns to the state when information was recorded or reproduced on the optical disc, and the objective lens is driven toward the center of the information track. With simple control of re-inversion, the laser beam is made to follow the information track again, and information is recorded on and reproduced from the optical disc. It can be resumed.

  According to a fourth aspect of the present invention, in the optical disc apparatus of the first aspect, when the control unit is not recording or reproducing information, the control unit drives the objective lens to emit laser light to the information on the optical disc. Stop tracking control to follow along the track, stop tracking the laser beam to the information track, reverse the polarity of the tracking error signal, and then resume tracking control to follow the laser beam to the intermediate area Is something that starts.

  If the polarity of the tracking error signal is reversed during tracking control of the objective lens to the information track, the objective lens is moved toward the intermediate area in order to control the objective lens to follow the intermediate area of the information track. The driving force in the tracking direction works. This force continues to act on the actuator until the laser beam condensed by the objective lens is near the center of the information track until it reaches the center of the intermediate area. For this reason, the objective lens may accelerate more than necessary in the tracking direction with respect to the optical disc, and may continue to move even after passing through the center of the intermediate region and cannot start tracking control to the intermediate region. is there.

  Therefore, the present invention temporarily stops the tracking control for driving the objective lens to follow the information track of the optical disc when the information is not recorded or reproduced, and the laser beam to the information track is temporarily stopped. By stopping tracking and reversing the polarity of the tracking error signal and then resuming tracking control to start tracking the laser beam to the intermediate area, stopping the tracking of the laser beam to the information track Unless an ideal optical disc without the optical disc is mounted on the optical disc apparatus, the possibility that the objective lens continues to follow the center of the information track of the rotating optical disc is extremely low. If the tracking control to the information track is stopped once and the tracking of the laser beam to the information track is stopped, the objective lens is often closer to the intermediate region to some extent than facing the center of the information track, At this timing, the force that drives the objective lens toward the intermediate area in the tracking direction is applied to the actuator, so that the objective lens can be prevented from being accelerated more than necessary, and tracking control to the intermediate area can be stably performed. Can start.

  An optical disk apparatus according to a fifth aspect is the optical disk apparatus according to any one of the first to fourth aspects, wherein the information track is a first information track, and the laser beam follows the first information track. The laser beam is stopped and caused to follow the intermediate region between the first information track and the second information track.

  According to the present invention, the information track is the first information track, the tracking of the laser beam to the first information track is stopped, and the laser beam is placed in an intermediate area between the first information track and the second information track. , The optical disc apparatus knows the position on the optical disc of the first information track that has been followed by the laser beam so far, and in the intermediate area located immediately next to the first information track. By waiting for the laser beam to follow, when a new recording or playback command arrives from the host device, access control to the target information track can be started without re-acquiring position information on the optical disk. Therefore, the recording and reproduction of information on the optical disc can be resumed quickly.

  According to a sixth aspect of the present invention, in the optical disc apparatus according to the first aspect, the control unit follows the laser beam along the information track of the optical disc when information is not recorded or reproduced. The tracking control is temporarily stopped, the tracking of the laser beam to the first information track is stopped, the polarity of the tracking error signal is reversed, and a kick signal that accelerates the objective lens in the tracking direction is output as a tracking drive signal The tracking control is resumed later, and the tracking of the laser beam to the intermediate area between the first information track of the optical disc and the second information track adjacent to the first information track is started.

  According to the present invention, when information is not recorded or reproduced, the tracking control for causing the laser light to follow the information track of the optical disk is temporarily stopped, and the tracking of the laser light to the first information track is stopped. Stops, reverses the polarity of the tracking error signal, outputs a kick signal that accelerates the objective lens in the tracking direction as a tracking drive signal, and then resumes tracking control to start the first information track and the first information track of the optical disc The tracking of the laser beam to the information track is stopped by starting the tracking of the laser beam to the intermediate area with the second information track adjacent to the intermediate track adjacent to the information track that has been tracked so far. Drive the objective lens toward the area and make sure that the objective lens is close to the next intermediate area before tracking control. Since the beginning, in the middle area located next to the information track which has been followed so far, it is possible to reliably follow the objective lens.

  The optical disc apparatus according to claim 7 is the optical disc apparatus according to claim 1, wherein a predetermined time elapses after a predetermined time elapses after the start-up process of the optical disk device is completed. This is a period until the follow-up of the laser beam to the information recording surface of the optical disc stops.

  Immediately after the start processing of the optical disk device is completed, there is a high possibility that a command for recording or reproducing information will come from the host device. For this reason, if the predetermined period for causing the laser beam to follow the intermediate area is started immediately after the start processing of the optical disk device is completed, the start processing of the optical disk device is completed, and the tracking to the information track is stopped to follow the intermediate region. Even if it has just started, it is likely that it will be necessary to immediately follow the information track again.

  Therefore, in the present invention, by setting the predetermined period to a period after a certain time has elapsed after the start processing of the optical disc apparatus is completed, the recording of information from the host device immediately after the start processing of the optical disc apparatus is completed. Even if a playback command arrives, the laser beam follows the information track of the optical disk for a certain period of time after the start-up process of the optical disk device is completed. It is possible to respond quickly to recording and playback commands from the device.

  Further, in the present invention, the predetermined period is set to a period until the tracking of the laser beam to the information recording surface of the optical disk stops after a certain period of time has passed, so that the tracking of the laser beam to the information recording surface of the optical disk is performed. While waiting for a recording or reproduction command from the host device while performing, the laser light is made to follow the intermediate area until the tracking is stopped, so that the current consumption during standby of the optical disk apparatus can be greatly reduced.

  The optical disc device according to claim 8 is the optical disc device according to claim 1, wherein a predetermined time elapses after a predetermined time elapses after the recording or reproduction of information ends. This is a period until the follow-up of the laser beam to the information recording surface of the optical disc stops.

  Immediately after the recording or reproduction of information is completed, there is a high possibility that a command for recording or reproducing information will come again from the host device. For this reason, if the predetermined period for tracking the laser beam to the intermediate area is started immediately after the recording or reproduction of information is completed, the recording or reproduction of information is terminated, and the tracking of the information track is stopped to follow the intermediate area. Even if it has just started, it is likely that it will be necessary to immediately follow the information track again.

  Therefore, in the present invention, the predetermined period is set to a period after a certain period of time has elapsed after the recording or reproduction of information is completed. Even when a recording or playback command arrives, the laser beam follows the information track of the optical disk and can immediately start recording and playback, so it can respond quickly to recording and playback commands from the host device. can do.

  Further, in the present invention, the predetermined period is set to a period until the tracking of the laser beam to the information recording surface of the optical disk stops after a certain period of time has passed, so that the tracking of the laser beam to the information recording surface of the optical disk is performed. While waiting for a recording or reproduction command from the host device while performing, the laser light is made to follow the intermediate area until the tracking is stopped, so that the current consumption during standby of the optical disk apparatus can be greatly reduced.

  The optical disk apparatus according to claim 9 is the optical disk apparatus according to claim 1, wherein when an optical disk on which groove recording is performed in which information is recorded only in the groove area which is an information track is mounted, the intermediate area is Land area.

  According to the present invention, when an optical disc on which groove recording is performed, in which information is recorded only in the groove area which is an information track, is mounted, the intermediate area is a land area, so that a laser beam is applied to a land area without a recording mark. To prevent the generation of unnecessary drive current supplied to the actuator that drives the objective lens by reducing the mixing of high-frequency components into the servo error signal, so that the optical disk on which groove recording was performed was mounted. Even in this case, the current consumption of the optical disk device can be reduced.

  According to a tenth aspect of the present invention, there is provided a method for controlling an optical disc apparatus, wherein a laser beam for recording and reproducing information is focused on an optical disc, a tracking error signal is generated based on reflected light from the optical disc, and the tracking error signal is Based on this, a tracking drive signal for driving the objective lens in the tracking direction is generated, and the servo processing unit is controlled so that the laser beam condensed by the objective lens follows the information track of the optical disc to record and reproduce information. The laser beam is caused to follow an intermediate area between the first information track of the optical disc and the second information track adjacent to the first information track for a predetermined period.

  According to the present invention, the laser beam is caused to follow an intermediate area between the first information track of the optical disc and the second information track adjacent to the first information track for a predetermined period in which no information is recorded or reproduced. By suppressing the generation of unnecessary drive current supplied to the actuator that drives the objective lens by reducing the mixing of high-frequency components into the servo error signal by causing the laser beam to follow the unmarked portion of the optical disk, The current consumption of the optical disk device can be reduced.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of an optical disc apparatus according to an embodiment of the present invention. In FIG. 1, 1 is an optical disk, 2 is a pickup module, 3 is a spindle motor, 4 is a lens holder, 5 is an objective lens, 6 is an actuator, 7 is a carriage, 8 is an optical pickup, 9 is a feed unit, and 10 is a feed motor. , 11 is an analog signal processing unit, 12 is a servo processing unit, 13 is a motor driving unit, 14 is a controller, 15 is a ROM, and 16 is a RAM. In FIG. 1, 101 is a pickup output signal output from the optical pickup 8 to the analog signal processing unit 11, 102 is a servo error signal output from the analog signal processing unit 11 to the servo processing unit 12, and 103 is a pickup module 2. Is a spindle FG signal output from the controller 14 to the controller 14, 104 is a servo processing signal output from the servo processing unit 12 to the controller 14, 105 is a control signal output from the controller 14 to the servo processing unit 12, and 106 is a servo processing unit 12. Is a pickup module control signal output from the motor drive unit 13 to the motor drive unit 13, and 107 is a pickup module drive signal output from the motor drive unit 13 to the pickup module 2.

  A pickup module 2 that performs at least one of recording and reproduction of information on the optical disc 1 using a light emission pattern of the laser beam collects the laser beam on the information recording surface of the optical disc 1 and a spindle motor 3 that holds and rotates the optical disc 1. An objective lens 5 that illuminates, a lens holder 4 that is movable with respect to the carriage 7, and a feed motor 10 that moves the carriage 7 on which the lens holder 4 is mounted in the radial direction of the optical disc 1. And a feed unit 9 provided with The lens holder 4 and the carriage 7 are provided with a coil and a magnet (not shown), and an actuator 6 is configured to drive the lens holder 4 in the focus direction and the tracking direction by passing a current through the coil. The objective lens 5 is driven via the lens holder 4. The analog signal processing unit 11 generates a servo error signal 102 such as a focus error signal and a tracking error signal based on a pickup output signal 101 that is an output signal from a not-shown split optical sensor inside the optical pickup 8 to generate a servo processing unit 12. Output to. Here, the focus error signal in the servo error signal 102 indicates a deviation in the thickness direction of the optical disc 1 between the light spot and the recording surface on which the information track of the optical disc 1 is located. This is used for focus control for causing 5 to follow the focus direction. Further, the tracking error signal of the servo error signal 102 indicates a deviation in the radial direction of the optical disc 1 between the light spot and the information track of the optical disc 1, and causes the objective lens 5 to follow the information track of the optical disc 1 in the tracking direction. Used for tracking control.

  Based on the servo error signal 102 from the analog signal processing unit 11, the servo processing unit 12 outputs a pickup module control signal 106 including a focus drive signal for driving the objective lens 5 in the focus direction and a tracking drive signal for driving in the tracking direction. Generated and output to the motor drive unit 13. In addition, the servo processing signal 104 that is various signals that have been subjected to calculation processing by the servo processing unit 12 is output to the controller 14. The servo processing unit 12 is a digital signal processing unit that performs digital signal processing.

  The motor drive unit 13, based on the pickup module control signal 106 sent from the servo processing unit 12, a focus drive current signal output to the pickup module 2 to drive the objective lens 5 in the focus direction, and the objective lens 5. To drive the objective lens 5 by generating a pickup module drive signal 107 including a tracking drive current signal output to the pickup module 2 in order to drive in the tracking direction. In other words, the motor drive unit 13 that is a driver IC drives the spindle motor 3, the actuator 6, and the feed motor 10 by passing a current based on the pickup module control signal 106 from the servo processing unit 12. Further, the motor drive unit 13 performs feed control using the low frequency component of the tracking error signal in the servo error signal 102 so that the objective lens 5 maintains a substantially neutral position. The feed unit 9 includes a feed motor 10 and a gear, a screw shaft, and the like (not shown), and the carriage 7 moves as the feed motor 10 rotates.

  The controller 14, which is a control means, receives signals from each unit such as the pickup module 2 and the servo processing unit 12, performs arithmetic processing on these signals, and sends the result (signal) of this arithmetic processing to each unit. Each part is driven and processed to control each part. The controller 14 includes at least an arithmetic processing device such as a CPU and MPU having an arithmetic function, and a storage unit such as a ROM 15 and a RAM 16. The controller 14 is a digital signal processing unit that performs digital signal processing.

  The configuration of the servo processing unit 12 in the optical disc apparatus configured as described above will be described in more detail with reference to FIG.

  FIG. 2 is a detailed block diagram of the servo processing unit in the optical disk apparatus according to the first embodiment. In FIG. 2, 1201 is an inverter, 1202 is a switch, and 1203 is a tracking filter. The inverter 1201, the switch 1202, and the tracking filter 1203 are provided in the servo processing unit 12.

  Each signal shown in FIG. 2 will be described.

  Reference numeral 102a denotes a tracking error signal among the servo error signals 102 output from the analog signal processing unit 11 to the servo processing unit 12 described with reference to FIG.

  A tracking error signal 104a is included in the servo processing signal 104 output from the servo processing unit 12 described with reference to FIG.

  Reference numeral 105a denotes a switching signal among the control signals 105 input to the servo processing unit 12 from the controller 14 described with reference to FIG.

  Reference numeral 106 a denotes a tracking drive signal among the pickup module control signals 106 output from the servo processing unit 12 described with reference to FIG. 1 to the motor drive unit 13.

  Moreover, it demonstrates from a viewpoint of the function of each part in FIG.

  The inverter 1201 inverts the polarity of the tracking error signal 102 a and outputs it to the tracking filter 1203 via the switch 1202.

  The switch 1202 performs circuit switching according to the switching signal 105 a from the controller 14. When the switch 1202 constitutes a circuit that does not include the inverter 1201, the tracking error signal 102a is output as it is to the tracking filter 1203 and the controller 14 as the tracking error signal 104a. On the other hand, when the switch 1202 forms a circuit including the inverter 1201, the tracking error signal 102a whose polarity is inverted by the inverter 1201 is output to the tracking filter 1203 and the controller 14 as the tracking error signal 104a.

  The tracking filter 1203 amplifies the tracking error signal 104a coming from the switch 1202 with a predetermined frequency characteristic to generate a tracking drive signal 106a, and outputs the tracking drive signal 106a to the motor drive unit 13 described with reference to FIG.

  The behavior of the laser beam when the polarity of the tracking error signal 102a is reversed in the optical disk apparatus having the above configuration will be described with reference to FIG.

  FIG. 3 is a diagram for explaining tracking control in the optical disc apparatus according to the first embodiment. 3, the horizontal axis indicates the radial position of the information recording surface of the optical disc 1, FIG. 3 (a) shows a part of the information recording surface of the optical disc 1, and FIGS. 3 (b) and 3 (c) are objectives. The tracking error signal 104a that appears when the lens 5 is moved in the radial direction of the optical disc 1 is shown. FIG. 3B shows the tracking error signal 104a whose polarity is not inverted, and FIG. The tracking error signal 104a in which the polarity is inverted in the inverter 1201 described with reference to FIG.

  On the information recording surface of the optical disc 1, information tracks on which information is recorded and intermediate regions between the information tracks where information is not recorded are alternately configured in the radial direction of the optical disc 1.

  In the following description, when the optical disk apparatus of the present embodiment is mounted with the groove recording type optical disk 1 in which information is recorded only in the groove area of the groove area and land area of the information recording surface of the optical disk 1. Will be described as an example of the embodiment.

  In FIG. 3A, a1 and a2 are groove areas which are information tracks of the optical disk 1 of the groove recording system, and b0 and b1 are land areas which are intermediate areas of the optical disk 1 of the groove recording system. Here, as shown in FIG. 3A, the land area b0, the groove area a1, the land area b1, and the groove area a2 are arranged in this order from the radially inner periphery side to the outer periphery side of the optical disc 1. Yes.

  In FIG. 3A, a11 is a groove area center which is the center of the groove area a1, b01 is a land area center which is the center of the land area b0, and a21 is a groove area which is the center of the groove area a2. B11 is the center of the land area which is the center of the land area b1.

  The objective lens 5 focuses the laser light emitted from the laser light source provided in the pickup module 2 on the information recording surface of the optical disc 1 in which the groove area a1 and the land area b1 exist.

  The objective lens 5 is moved in the radial direction of the optical disc 1 so that the laser beam condensed by the objective lens 5 traverses the groove region a1 and the land region b1 of the optical disc 1 shown in FIG. As a tracking error signal, a signal approximated by a sine waveform is output as shown in FIG.

  More precisely, the laser light collected by the objective lens 5 from the groove area center a11 which is the center of the groove area a1 shown in FIG. As shown in FIG. 3B, the tracking error signal 104a when moving from the inner peripheral side in the radial direction of the optical disc 1 to the outer peripheral side in the radial direction up to the central groove region center a21 is the groove region center a11. After outputting zero and gradually becoming smaller and taking the minimum value, this time gradually getting larger and then becoming zero again at the land area center b11 which is the center of the land area b1, and further becoming larger and taking the local maximum value It gradually decreases again and becomes zero again at the adjacent groove region center a21.

  That is, the tangent slope of the waveform of the tracking error signal 104a is negative and the radial position where the output value is zero indicates the groove region center a11. The slope of the tangent line of the tracking error signal 104a is positive and the output value is zero. The radius position that becomes the land area center b11. In the optical disk apparatus that outputs such a tracking error signal 104a, when tracking control for driving the objective lens 5 to follow the laser beam along the groove area a1 of the optical disk 1 is started, The tracking error signal 104a is driven so that the tangential slope of the waveform is negative and the output value is zero toward the radial position.

  As described above, in the optical disk apparatus according to the present embodiment, when the switch 1202 of the servo processing unit 12 described with reference to FIG. 2 is switched to form a circuit including the inverter 1201, the polarity of the tracking error signal 102a is inverted. As shown in FIG. 3C, the polarity of the tracking error signal 104a whose polarity is inverted is inverted between the positive and negative polarities. That is, the radial position where the slope of the tangent of the waveform of the tracking error signal 104a whose polarity is inverted is negative and the output value becomes zero indicates the land area center b11. In tracking control, the objective lens 5 is driven so as to go to a radial position where the slope of the tangent of the waveform of the tracking error signal 104a is negative and the output value becomes zero. Therefore, when the polarity of the tracking error signal 102a is reversed, the objective lens 5 is driven. The lens 5 is driven toward the land area center b11.

  Next, the principle of the optical disk apparatus according to the present embodiment will be described with reference to FIG.

  FIG. 4 is a diagram for explaining the principle of the optical disc apparatus according to the first embodiment. 4, the horizontal axis indicates time, FIGS. 4A and 4E indicate RF signals, FIGS. 4B and 4F indicate tracking error signals 104a, and FIG. 4C and 4G show the tracking drive signal 106a, and FIGS. 4D and 4H show a part of the information recording surface of the optical disc 1. FIG. 4 (a) to 4 (c) show the laser light focused by the objective lens 5 on the information recording surface of the optical disc 1 as schematically shown in FIG. 4 (d). 4 (e) to FIG. 4 (g) follow the land area b1 as schematically shown in FIG. 4 (h). The state is shown. FIG. 4D is a diagram schematically showing the state of tracking of the laser beam, and the temporal relationship between FIG. 4A, FIG. 4B, and FIG. 4C. There is no. FIG. 4 (h) is also a diagram schematically showing the tracking state of the laser beam, and the temporal relationship between FIG. 4 (e), FIG. 4 (f), and FIG. 4 (g). There is no.

  The RF signals shown in FIGS. 4A and 4E indicate changes in brightness of reflected light from the optical disc 1. For example, CD-ROMs, DVD-ROMs, etc. have pits as recording marks formed on information tracks, and the level of reflected light changes when the laser beam emitted from the objective lens passes through the pits. And represents the recorded information. The optical disc apparatus reproduces information recorded on the optical disc 1 by decoding the RF signal when the laser beam is caused to follow the groove area. Since the tracking error signal 104a shown in FIG. 4B and FIG. 4F is generated from the reflected light from the optical disc 1, not a few RF signal components are mixed in the tracking error signal 104a.

  When the laser beam is made to follow the groove area a1, since there is a recording mark in the groove area a1, the brightness of the reflected light changes remarkably depending on the presence or absence of this mark, and the amplitude is large as shown in FIG. An RF signal is output. Since an RF signal component is mixed in the tracking error signal 104a, when the amplitude of the RF signal is large, a tracking error signal 104a having a large amplitude is output as shown in FIG. 4B. Since the tracking drive signal 106a is generated by amplifying the tracking error signal 104a with a predetermined frequency characteristic, when the tracking error signal 104a has a large amplitude, the tracking drive signal 106a corresponding to the current for driving the objective lens 5 is also used. As shown in FIG. 4C, the amplitude is large.

  On the other hand, when the laser beam is made to follow the land region b1, since there is no recording mark in the land region b1, the change in brightness of reflected light is smaller than that in the case where the laser beam is made to follow the groove region a1. As shown in (e), an RF signal having a small amplitude is output. When the amplitude of the RF signal is small, the tracking error signal 104a has a small amplitude as shown in FIG. 4F, and the tracking drive signal 106a is also shown in FIG. 4G. The amplitude becomes small.

  In the optical disk device of the present embodiment, the laser beam is caused to follow the land area b1 during a predetermined period when information is not recorded or reproduced. By making the land area b1 follow the conventional groove area a1, the mixing of the RF component into the tracking error signal 104a is reduced, and the tracking drive signal 106a is less disturbed.

  As described above, the controller 14 which is a control unit in the optical disc apparatus does not record or reproduce information, and the second groove adjacent to the first groove region a1 and the first groove region a1 of the optical disc 1 is a predetermined period. By causing the laser light to follow the land area b1 which is an intermediate area with the area a2, the laser light is caused to follow the markless portion of the optical disk 1 to reduce the mixing of high-frequency components into the tracking error signal 102a. Since the generation of the unnecessary tracking drive signal 106a supplied to the actuator 6 that drives the lens 5 is suppressed, the current consumption of the optical disc apparatus can be reduced.

  Further, as in the optical disk apparatus described in the present embodiment, when the optical disk 1 on which groove recording is performed, in which information is recorded only in the groove area that is an information track, is mounted, an intermediate area between the information track and the information track Is the land area. Generation of unnecessary drive current supplied to the actuator 6 for driving the objective lens 5 is reduced by causing the laser light to follow the land area without the recording mark to reduce the mixing of the high frequency RF signal component into the tracking error signal 102a. Therefore, even when the optical disk 1 on which groove recording has been performed is loaded, the current consumption of the optical disk apparatus can be reduced.

  In the optical disk apparatus according to the present embodiment, as described with reference to FIGS. 2 and 3, the circuit is switched according to the switching signal 105 a from the controller 14 to configure a circuit including the inverter 1201. The polarity of the tracking error signal 102a is inverted by the inverter 1201 so that the laser light follows the land region b1.

  In this way, the waveform of the tracking error signal 104a is positive / negative by causing the laser light to follow the land region b1 by inverting the polarity of the tracking error signal 102a for a predetermined period when information is not recorded or reproduced. The radial position where the polarity is reversed, the slope of the tangent of the waveform of the tracking error signal 104a is negative and the output value of the tracking error signal 104a is zero is an intermediate area between the groove area a1 and the adjacent groove area a2 in the optical disc 1 The land area center b11 at the center of the land area b1 is shown, and the objective lens 5 is driven toward the land area center b11, so that the groove area a1 and the groove area a2 are arranged with a very simple configuration. The laser beam can follow the land area b1.

  Hereinafter, a predetermined period in which information is not recorded or reproduced in the above-described optical disc apparatus will be described with reference to FIGS.

  FIG. 5 is a flowchart after the start-up process of the optical disk apparatus according to the first embodiment is completed. FIG. 5 shows the flow of processing from the end of the startup processing of the optical disc apparatus to the start of recording and reproduction of information on the optical disc 1.

  Here, the startup process of the optical disk apparatus will be described first.

  When the optical disc 1 is loaded in the optical disc apparatus, the optical disc apparatus starts a startup process. In this start-up process, the controller 14 which is a control unit of the optical disc apparatus rotates various types of learning in order to optimally record or reproduce information on the optical disc 1 by rotating the loaded optical disc 1 with the spindle motor 3. I do. For example, servo learning, which is learning of follow-up control in which the laser light focused by the objective lens 5 follows the information track on the information recording surface of the rotating optical disc 1, and marks indicating information on the optical disc 1 are optimized. In order to form it, recording learning is performed to learn the power and timing for emitting laser light. Various learning results are stored in a RAM 16 provided in the controller 14. Hereinafter, the flow of processing of the optical disc apparatus after the startup processing will be described.

  In S101, the controller 14 ends the activation process of the optical disc apparatus. At this time, the laser beam waits for a command such as information recording or reproduction from the host device while following the groove area a1, which is an information track as shown in FIG. 4D, for example.

  Next, in S102, the controller 14 determines whether or not a command for recording or reproducing information has arrived from the host device connected to the optical disc apparatus. If the controller 14 detects a recording or reproduction command, the process proceeds to S103. If no recording or reproduction command is detected, the controller 14 proceeds to S104.

  In S103, when the controller 14 detects a recording or playback command from the host device in S102, the controller 14 moves the objective lens 5 in the tracking direction from the groove area a1 of the optical disc 1 that is following at that time according to the command. A seek operation for moving the laser beam to the target groove area is performed, and recording and reproduction of information on the target groove area are started.

  If the controller 14 does not detect a recording or reproduction command from the host device in S102 in S104, the controller 14 keeps the laser light following the groove area a1 and waits for 5 seconds after the start-up process of the optical disc apparatus is completed. Determine if has passed. If 5 seconds have not elapsed since the start-up process is completed, the process returns to S102, and it is determined again whether a command for recording or reproducing information has arrived. This standby state is continued for 5 seconds. On the other hand, when 5 seconds have elapsed since the start-up process is completed, the process proceeds to S105.

  In S105, the controller 14 reverses the polarity of the tracking error signal 102a when the state where there is no command continues for 5 seconds after the start-up process is completed in S101, so that the laser beam is as shown in FIG. An intermediate area tracking process for tracking the land area b1 on the information recording surface of the optical disc 1 is performed, and the tracking of the laser beam to the land area b1 is started, and the arrival of commands such as information recording and reproduction from the host device stand by.

  As described above, during a predetermined period in which no information is recorded or reproduced, the laser light is caused to follow the land area b1, thereby causing the laser light to follow the mark-free portion of the optical disk 1 and the high frequency to the tracking error signal 102a. Since mixing of components is reduced and generation of unnecessary tracking drive signal 106a is suppressed, current consumption of the optical disc apparatus can be reduced.

  In addition, immediately after the start processing of the optical disc apparatus is completed, there is a high possibility that a command for recording or reproducing information will come from the host device. For this reason, if the predetermined period for causing the laser beam to follow the land area b1 is started immediately after the start processing of the optical disc apparatus is completed, the start processing of the optical disc apparatus is ended, and the tracking to the groove area a1 is stopped and the land area b1 is stopped. Even if the follow-up to has just started, there is a high possibility that a command for recording or reproducing information will come from the host device, and it will be necessary to immediately follow the groove area a1 again.

  Therefore, in the optical disk device according to the present embodiment, the predetermined period is set to a period after a predetermined time has elapsed after the start processing of the optical disk device is completed, so that immediately after the start processing of the optical disk device is completed, Even when a command for recording or reproducing information is received from the host device, the laser beam follows the groove area a1 of the optical disk 1 for a certain period of time after the start-up process of the optical disk apparatus is completed, and recording and reproduction are immediately performed. Since it can be started, it can respond quickly to recording and playback commands from the host device.

  Next, in S106, the controller 14 determines whether a command for recording or reproducing information has arrived from the host device connected to the optical disc apparatus while following the laser beam to the land area b1. to decide. If the controller 14 detects a recording or reproduction command, the process proceeds to S107. If the recording or reproduction command is not detected, the controller 14 proceeds to S109.

  Next, in S107, when the controller 14 detects a recording or reproduction command from the host device in S106, the tracking error is generated in order to start recording or reproducing information on the target groove area of the optical disc 1 according to the command. By reversing the polarity of the signal 102a, an information track follow-up restart process is performed in which the laser light again follows the groove area a1 on the information recording surface of the optical disc 1, and the follow-up of the laser light to the groove area a1 is resumed.

  As described above, when a new information recording / reproducing command arrives from a host device connected to the optical disc apparatus during a predetermined period in which no information is recorded or reproduced, the polarity of the tracking error signal 102a is reversed again. As a result, the waveform of the tracking error signal 104a returns to the state when the positive / negative polarity is reversed again and the information is recorded or reproduced on the optical disc 1, and the objective lens 5 is moved to the groove area center a11. Since it is driven in the direction of the head, it is possible to record and reproduce information on the optical disc 1 by causing the laser light to follow the groove region a1 again by only simple control of re-inverting the polarity of the tracking error signal 102a. It can be in a ready state.

  In S108, the controller 14 tracks the objective lens 5 from the groove area a1 of the optical disc 1 that is following at that time according to the command when the laser beam resumes following the groove area a1 in the information track tracking restart process in S107. A seek operation for moving the laser beam to the target groove area is performed, and recording and reproduction of information on the target groove area is started.

  In S109, if the controller 14 does not detect a recording or playback command from the host device in S106, the controller 14 starts up the optical disk apparatus 5 seconds after the laser beam is allowed to follow the land area b1. The intermediate area following process in S105 is started, and it is determined whether or not 25 seconds have passed. If 25 seconds have not elapsed, the process returns to S106 to determine again whether a command for recording or reproducing information has arrived. On the other hand, this standby state is continued for 25 seconds, and when 25 seconds have elapsed, the process proceeds to S110.

  Next, in S110, the controller 14 starts the intermediate area tracking process in S105 5 seconds after the start process of the optical disk apparatus is completed, and when 25 seconds have passed, that is, the start process of the optical disk apparatus is completed. If no command is continued for 30 seconds, the tracking of the laser beam to the information recording surface of the optical disc 1 is stopped, and the spindle motor 3 is stopped from rotating, and the recording or reproduction of information from the host device is performed. Wait for the command to arrive.

  As described above, the laser beam on the information recording surface of the optical disc 1 after a certain period of time elapses after the start-up process of the optical disc apparatus is completed for a predetermined period in which no information is recorded or reproduced. By setting the period until the optical tracking stops, while the laser beam is tracked on the information recording surface of the optical disc 1 while waiting for a recording or reproduction command from the host device, the tracking is stopped. Since the laser light is made to follow the land area b1 all the time, the current consumption during standby of the optical disk apparatus can be greatly reduced.

  Next, in S111, the controller 14 stops the tracking of the laser beam on the information recording surface, and whether or not a command for recording or reproducing information has arrived from the host device connected to the optical disc apparatus. Judging. When the controller 14 detects a recording or reproduction command, the process proceeds to S112. On the other hand, when a recording or reproduction command is not detected, the controller 14 repeats the process of S111 and waits for a command such as information recording or reproduction. To do.

  In S112, when the controller 14 detects a recording or reproduction command in S111, the controller 14 performs a high-speed startup process of the optical disc apparatus. Since the optical disk apparatus has already performed various learning during the startup process before S101 and has stored the learning result in the RAM 16, it is unnecessary if the spindle motor 3 is rotated and the tracking of the laser beam to the groove area a1 is resumed. It is possible to respond quickly to commands from the host device without performing learning processing or the like.

  In S113, the controller 14 resumes the tracking of the laser beam to the groove area a1 in the high-speed startup process of S112. In accordance with the command, the controller 14 moves the objective lens 5 in the tracking direction from the groove area a1 of the optical disk 1 that is currently tracking. A seek operation for moving the laser beam to the target groove area is performed, and recording and reproduction of information on the target groove area are started.

  As described above, in the optical disk apparatus according to the present embodiment, the laser beam follows the information recording surface of the optical disk 1 after a certain time has elapsed after the start-up process of the optical disk apparatus has been completed. The polarity of the tracking error signal 102a is inverted for a predetermined period during which information is not recorded or reproduced, which is a period until the disk stops, and is adjacent to the first groove area a1 and the first groove area a1 of the optical disc 1. By causing the laser light to follow the land area b1 which is an intermediate area with the second groove area a2, the laser light is caused to follow the mark-free portion of the optical disc 1 to reduce the mixing of high-frequency components into the tracking error signal 102a. This suppresses generation of an unnecessary tracking drive signal 106a supplied to the actuator 6 that drives the objective lens 5. Runode, it is possible to reduce the current consumption of the optical disk apparatus. Further, when a command for recording or reproducing information arrives from a host device connected to the optical disk apparatus during a predetermined period, the polarity of the tracking error signal 102a is reversed again, so that the waveform of the tracking error signal 104a becomes positive or negative. Since the negative polarity is reversed again, the state returns to the state in which information was recorded or reproduced on the optical disc 1, and the objective lens 5 is driven toward the groove region center a11, and therefore the tracking error signal 102a. With the simple control of re-inverting the polarity of the laser beam, it is possible to cause the laser beam to follow the groove area a1 again and to start recording and reproducing information on the optical disc 1.

  A predetermined period during which no information is recorded or reproduced will be described with reference to FIG.

  FIG. 6 is a flowchart after the end of the recording / reproducing process of the optical disc apparatus according to the first embodiment. FIG. 6 shows the flow of processing from the end of the recording / reproducing process of the optical disc apparatus, which is the process of recording and reproducing information to / from the optical disc 1, to the resumption of recording / reproducing information on the optical disc 1. ing.

  Here, the recording / reproducing process of the optical disc apparatus will be described first.

  The optical disc apparatus performs a recording / reproducing process for recording and reproducing a predetermined amount of information at a predetermined address of the optical disc 1 in response to a command from the host device. When the process is completed, the host device again enters a standby state waiting for a command. Hereinafter, a flow of processing of the optical disc apparatus after the recording / reproducing process will be described.

  In S201, the controller 14 ends the recording / reproducing process of the optical disc apparatus. At this time, the laser beam waits for a command such as information recording or reproduction from the host device while following the groove area a1, which is an information track as shown in FIG. 4D, for example.

  Next, in S202, the controller 14 determines whether or not a command for recording or reproducing information has arrived from the host device connected to the optical disc apparatus. When the controller 14 detects a recording or reproduction command, the process proceeds to S203. On the other hand, when the controller 14 does not detect a recording or reproduction command, the process proceeds to S204.

  In S203, when the controller 14 detects a recording or reproduction command from the host device in S202, the controller 14 moves the objective lens 5 in the tracking direction from the groove area a1 of the optical disc 1 that is following at that time according to the command. A seek operation for moving the laser beam to the target groove area is performed, and information recording and reproduction is resumed in the target groove area.

  In S204, if the controller 14 does not detect a recording or reproduction command from the host device in S202, the controller 14 does not detect the recording / reproducing process of the optical disc apparatus while the laser light is made to follow the groove area a1. Determine if seconds have passed. If 5 seconds have not elapsed since the recording / reproducing process has ended, the process returns to S202, and it is determined again whether or not a command for recording or reproducing information has arrived. This standby state is continued for 5 seconds. On the other hand, when 5 seconds have elapsed since the recording / reproducing process is completed, the process proceeds to S205.

  In S205, the controller 14 reverses the polarity of the tracking error signal 102a when the state where there is no command continues for 5 seconds after the recording / reproducing process ends in S201, as shown in FIG. An intermediate area tracking process for tracking the land area b1 on the information recording surface of the optical disc 1 is performed, and the tracking of the laser beam to the land area b1 is started, and the arrival of commands such as information recording and reproduction from the host device stand by.

  As described above, during a predetermined period in which no information is recorded or reproduced, the laser light is caused to follow the land area b1, thereby causing the laser light to follow the mark-free portion of the optical disk 1 and the high frequency to the tracking error signal 102a. Since mixing of components is reduced and generation of unnecessary tracking drive signal 106a is suppressed, current consumption of the optical disc apparatus can be reduced.

  In addition, immediately after the recording / reproducing process of the optical disc apparatus is completed, there is a high possibility that a command for recording or reproducing information is received from the host device. For this reason, if a predetermined period in which the laser beam follows the land area b1 is started immediately after the recording / reproducing process of the optical disk apparatus is completed, the recording / reproducing process of the optical disk apparatus is terminated, and the tracking to the groove area a1 is stopped. Even if the tracking of the area b1 has just been started, there is a high possibility that a command for recording or reproducing information will be received from the host device and it will be necessary to immediately follow the groove area a1 again.

  Therefore, in the optical disc apparatus according to the present embodiment, the predetermined period is set to a period after a certain time has elapsed after the recording / reproducing process of the optical disc apparatus is completed, so that the recording / reproducing process of the optical disc apparatus is completed. In addition, even when a command for recording or reproducing information is received from the host device, the laser beam follows the groove area a1 of the optical disc 1 for a certain time after the recording / reproducing processing of the optical disc apparatus is completed, and recording is immediately performed. Since the playback can be resumed, it is possible to promptly respond to a recording or playback command from the host device.

  Next, in S206, the controller 14 checks whether or not a command for recording or reproducing information has arrived from the host device connected to the optical disk apparatus while following the laser beam land area b1. to decide. If the controller 14 detects a recording or reproduction command, the process proceeds to S207. If the recording or reproduction command is not detected, the controller 14 proceeds to S209.

  Next, in step S207, when the controller 14 detects a recording or reproduction command from the host device in step S206, the controller 14 resumes recording or reproduction of information with respect to the target groove area of the optical disc 1 according to the command. By reversing the polarity of the signal 102a, an information track follow-up restart process is performed in which the laser light again follows the groove area a1 on the information recording surface of the optical disc 1, and the follow-up of the laser light to the groove area a1 is resumed.

  As described above, when a new information recording / reproducing command arrives from a host device connected to the optical disc apparatus during a predetermined period in which no information is recorded or reproduced, the polarity of the tracking error signal 102a is reversed again. As a result, the waveform of the tracking error signal 104a returns to the state when the positive / negative polarity is reversed again and the information is recorded or reproduced on the optical disc 1, and the objective lens 5 is moved to the groove area center a11. Since it is driven in the direction of the head, it is possible to record and reproduce information on the optical disc 1 by causing the laser light to follow the groove region a1 again by only simple control of re-inverting the polarity of the tracking error signal 102a. It can be in a ready state.

  In S208, the controller 14 tracks the objective lens 5 from the groove area a1 of the optical disc 1 that is following at that time according to the command when the laser beam resumes following the groove area a1 in the information track tracking restart process of S207. A seek operation for moving the laser beam to the target groove area is performed, and recording and reproduction of information on the target groove area is resumed.

  In S209, if the controller 14 does not detect a recording or reproduction command from the host device in S206, the recording / reproducing process of the optical disc apparatus is completed for 5 seconds while the laser beam is made to follow the land area b1. Later, the intermediate area tracking process in S205 is started, and it is determined whether or not 25 seconds have passed. If 25 seconds have not elapsed, the process returns to S206 to determine again whether or not a command for recording or reproducing information has arrived. On the other hand, this standby state is continued for 25 seconds, and when 25 seconds have elapsed, the process proceeds to S210.

  Next, in S210, the controller 14 starts the intermediate area tracking process in S205 5 seconds after the recording / reproducing process of the optical disk apparatus is completed, and when 25 seconds have passed, that is, the recording / reproducing process of the optical disk apparatus is completed. If no command continues for 30 seconds, the tracking of the laser beam to the information recording surface of the optical disc 1 is stopped, and the spindle motor 3 is stopped rotating, and information is recorded and reproduced from the host device. Wait for the arrival of commands such as.

  As described above, a predetermined period of time during which no information is recorded or reproduced is recorded on the information recording surface of the optical disc 1 after a certain period of time has elapsed after the recording / reproducing process of the optical disc apparatus is completed. By setting the period until the tracking of the laser beam is stopped, the tracking is stopped while waiting for a recording or reproduction command from the host device while tracking the laser beam on the information recording surface of the optical disc 1. Since the laser beam is made to follow the land area b1 until the current consumption of the optical disk apparatus during standby is significantly reduced.

  Next, in S211, the controller 14 stops the tracking of the laser light on the information recording surface, and whether or not a command for recording or reproducing information has arrived from the host device connected to the optical disc apparatus. Judging. If the controller 14 detects a recording or reproduction command, the process proceeds to step S212. If the recording or reproduction command is not detected, the controller 14 repeats the process of S211 and waits for a command such as information recording or reproduction. To do.

  In S212, when the controller 14 detects a recording or reproduction command in S211, the controller 14 performs high-speed recording / reproducing processing of the optical disc apparatus. Since the optical disk apparatus has already performed various learning during the recording / reproducing process before S201 and stores the learning result in the RAM 16, it is not necessary if the spindle motor 3 is rotated and the tracking of the laser beam to the groove area a1 is resumed. It is possible to quickly respond to commands from the host device without performing any learning process.

  In S213, when the controller 14 resumes following the groove area a1 in the high-speed recording / reproducing process in S212, the controller 14 moves the objective lens 5 in the tracking direction from the groove area a1 of the optical disk 1 that is following at that time according to the command. To the target groove area and perform a seek operation or the like to resume recording and reproduction of information on the target groove area.

  As described above, in the optical disk apparatus according to the present embodiment, after a certain period of time has elapsed after the recording / reproducing process of the optical disk apparatus has been completed, a certain period of time has elapsed, and the laser light applied to the information recording surface of the optical disk 1 The polarity of the tracking error signal 102a is reversed for a predetermined period in which information is not recorded or reproduced until the tracking stops, and is adjacent to the first groove area a1 and the first groove area a1 of the optical disc 1. By causing the laser light to follow the land area b1 which is an intermediate area with the second groove area a2 to be performed, the laser light is caused to follow the unmarked portion of the optical disc 1 to mix high frequency components into the tracking error signal 102a. By reducing the generation of an unnecessary tracking drive signal 106a supplied to the actuator 6 that drives the objective lens 5, Since win, it is possible to reduce the current consumption of the optical disk apparatus. Further, when a command for recording or reproducing information arrives from a host device connected to the optical disk apparatus during a predetermined period, the polarity of the tracking error signal 102a is reversed again, so that the waveform of the tracking error signal 104a becomes positive or negative. Since the negative polarity is reversed again, the state returns to the state in which information was recorded or reproduced on the optical disc 1, and the objective lens 5 is driven toward the groove region center a11, and therefore the tracking error signal 102a. With the simple control of re-inverting the polarity of the laser beam, the laser beam can be made to follow the groove area a1 again, and information recording and reproduction on the optical disc 1 can be resumed.

  Next, the intermediate area following process in S105 of FIG. 5 and S205 of FIG. 6 will be described with reference to FIG.

  FIG. 7 is a timing chart of the intermediate area tracking process of the optical disk apparatus according to the first embodiment. In FIG. 7, the horizontal axis indicates time, FIG. 7 (a) indicates the tracking error signal 104a, FIG. 7 (b) indicates the tracking drive signal 106a, FIG. 7 (c) indicates the switching signal 105a, 7 (d) shows the behavior of the laser beam. Since the laser light is collected by the objective lens 5, the behavior of the laser light corresponds to the behavior of the objective lens 5.

  Until the time t101, the optical disc apparatus of the present embodiment is not recording or reproducing information with respect to the optical disc 1, and the laser beam enters the groove area a1 of the optical disc 1 as shown in FIG. Tracking control to be followed is performed. As shown in FIG. 7C, the output of the switching signal 105a for switching the switch 1202 described with reference to FIG. 2 is a Low output.

  At time t101, as shown in FIG. 7B, the tracking control for making the output of the tracking drive signal 106a zero and tracking the laser light along the groove area a1 of the optical disc 1 is stopped once. The laser beam tracking to the groove area a1 is stopped.

  From time t101 to time t102, as shown in FIG. 7D, the objective lens 5 is stationary with respect to the actuator 6 after the tracking control is stopped. The lens 5 is shifted in the tracking direction from the state relatively facing the groove area center a11, and in the example shown in FIG. 7D, the lens 5 is moved to the first groove area a1 and the first groove area a1 to some extent. It becomes a state approaching the land region b1 which is an intermediate region between the adjacent second groove region a2. Accordingly, as shown in FIG. 7A, the output value of the tracking error signal 104a moves away from zero.

  At time t102, as shown in FIG. 7B, output of the kick signal to the tracking drive signal 106a is started. When the kick signal is output, the objective lens 5 is accelerated toward the land area b1 in the tracking direction.

  From time t102 to time t103, as shown in FIG. 7B, until the output of the kick signal is stopped, as shown by the behavior of the laser light in FIG. Accelerate in the tracking direction. After stopping the output of the kick signal, the objective lens 5 moves in the tracking direction at a substantially constant speed. Accordingly, as shown in FIG. 7A, the output value of the tracking error signal 104a is further away from zero, approaches the threshold A, and exceeds the threshold A. When the controller 14 detects that the output value of the tracking error signal 104a exceeds the threshold A, the controller 14 next switches the output of the switching signal 105a at time t103, and the threshold of the tracking error signal 104a is opposite to that of A. To B with

  At time t103, as shown in FIG. 7C, the output of the switching signal 105a is set to High output, and the switch 1202 described with reference to FIG. The polarity of the error signal 102a is switched. When the polarity of the tracking error signal 102a is switched, as shown in FIG. 7A, the output value of the tracking error signal 104a input to the controller 14 is inverted, and the positive and negative polarities of the waveform are reversed. .

  From time t103 to time t104, the objective lens 5 further moves in the tracking direction as represented by the behavior of the laser light in FIG. When the center of the laser beam shifts from the first groove area a1 to the land area b1 which is an intermediate area between the first groove area a1 and the second groove area a2 adjacent to the first groove area a1, As shown in FIG. 7A, the output value of the tracking error signal 104a approaches zero.

  At time t104, as shown in FIG. 7B, output of a brake signal to the tracking drive signal 106a is started. When a brake signal having a polarity opposite to that of the kick signal is output, the movement of the objective lens 5 in the tracking direction is decelerated.

  From time t104 to time t105, as shown in FIG. 7B, until the output of the brake signal is stopped, as shown by the behavior of the laser light in FIG. Movement in the tracking direction is decelerated. After stopping the output of the brake signal, the objective lens 5 moves at a substantially constant speed in the tracking direction and approaches the land region center b11. Accordingly, as shown in FIG. 7A, the output value of the tracking error signal 104a further approaches zero and approaches the threshold value B.

  At time t105, when the output value of the tracking error signal 104a exceeds the threshold B and approaches zero, the controller 14 resumes tracking control of the objective lens 5 assuming that the center of the laser light has approached the land area center b11. Since the polarity of the tracking error signal 102a is switched at time t103, the laser beam starts to follow the land region b1, as shown in FIG. 7 (d).

  As described above, in the optical disk apparatus according to the present embodiment, the controller 14 drives the objective lens 5 to track the laser light along the groove area a1 of the optical disk when information is not recorded or reproduced. The control is temporarily stopped to stop the tracking of the laser beam to the groove area a1, and after reversing the polarity of the tracking error signal 102a, the tracking control is resumed to start the tracking of the laser beam to the land area b1.

  If the polarity of the tracking error signal 102a is reversed while the tracking control to the groove area a1 of the objective lens 5 is performed, the objective lens 5 is controlled by the actuator 6 in order to control the objective lens 5 to follow the land area b1. A force for driving in the tracking direction toward the land region b1 works. This force continues to act on the actuator 6 until the laser light condensed by the objective lens 5 reaches the land region center b11 from the state near the groove region center a11. Therefore, there is a possibility that the objective lens 5 is accelerated more than necessary in the tracking direction, cannot be decelerated even after passing through the land area center b11, and continues to move, and tracking control to the land area b1 cannot be started. .

  When the tracking control to the groove area a1 is stopped, the possibility that the objective lens 5 continues to follow the groove area center a11 of the rotating optical disk 1 is very low unless the ideal optical disk 1 having no eccentricity is mounted on the optical disk apparatus. Become.

  Therefore, if the tracking control to the groove area a1 is temporarily stopped and the tracking of the laser beam to the groove area a1 is stopped, the objective lens 5 is somewhat land area b0 or land rather than facing the groove area center a11. Since the force that drives the objective lens 5 in the tracking direction toward the land region b1 is applied to the actuator 6 at this timing, the object lens 5 is accelerated more than necessary. Therefore, tracking control to the land area b1 can be started stably.

  Further, as shown in FIG. 7B, the controller 14 drives the objective lens 5 to follow the laser beam along the groove area a1 of the optical disc 1 when information is not recorded or reproduced. The tracking control to be stopped is temporarily stopped, the tracking of the laser beam to the first groove region a1 is stopped, the polarity of the tracking error signal 102a is reversed, and the kick signal for accelerating the objective lens 5 in the tracking direction is a tracking drive signal. Tracking control is resumed after output as 106a, and the laser light is applied to the land area b1 which is an intermediate area between the first groove area a1 of the optical disc 1 and the second groove area a2 adjacent to the first groove area a1. Start following.

  As a result, the optical disk apparatus of the present embodiment stops the tracking of the laser beam to the groove area a1, and drives the objective lens 5 toward the land area b1 adjacent to the groove area a1 that has been tracked so far. Then, since the tracking control is started after the objective lens 5 is surely brought close to the adjacent land area b1, the objective lens 5 is placed in the land area b1 located immediately next to the groove area a1 that has been followed so far. It can be made to follow reliably.

  Hereinafter, control when performing the above-described intermediate region tracking processing will be described with reference to FIG.

  FIG. 8 is a flowchart of the intermediate area tracking process of the optical disc apparatus according to the first embodiment.

  In S301, the controller 14 starts the intermediate area following process. At this time, the laser light follows the groove area a1 of the optical disc 1 as shown in FIG. 7D, for example.

  First, in S302, the controller 14 stops the tracking control of the objective lens 5, and stops the tracking of the laser light to the groove area a1. When the tracking control is stopped, the objective lens 5 is generally shifted from the state facing the groove region center a11 in the tracking direction and is brought close to the land region b0 or the land region b1 to some extent.

  Next, in S303, the controller 14 outputs a kick signal to the tracking drive signal 106a. When the kick signal is output, the objective lens 5 is accelerated in the tracking direction. When the objective lens 5 moves in the tracking direction and moves away from the groove area center a11, the output value of the tracking error signal 104a moves away from zero and approaches the threshold value A.

  Next, in S304, the controller 14 determines whether or not the output value of the tracking error signal 104a being measured exceeds the threshold value A. If the output value does not exceed the threshold value A, the process of S304 is repeated, and the output value is the threshold value A. Wait until it exceeds. On the other hand, if the output value of the tracking error signal 104a exceeds the threshold A, the process proceeds to S305.

  In S <b> 305, when the output value of the tracking error signal 104 a exceeds the threshold A in S <b> 304, the controller 14 changes the threshold of the tracking error signal 104 a to a threshold B having an opposite sign to the threshold A.

  Further, in S306, when the output value of the tracking error signal 104a exceeds the threshold A in S304, the controller 14 configures a servo circuit including the inverter 1201 by switching the switch 1202 described with reference to FIG. The polarity of the tracking error signal 102a is switched.

  Next, in S307, the controller 14 outputs a brake signal to the tracking drive signal 106a. When the brake signal is output, the objective lens 5 moving in the tracking direction is decelerated. When the objective lens 5 moves in the tracking direction from the groove area center a11 and approaches the land area center b11, the output value of the tracking error signal 104a approaches the threshold value B toward zero.

  Next, in S308, the controller 14 determines whether or not the output value of the tracking error signal 104a being measured exceeds the threshold B and approaches zero, and repeats the processing in S308 and outputs the output as long as the threshold B is not exceeded. Wait until the value exceeds threshold B and approaches zero. On the other hand, if the output value of the tracking error signal 104a exceeds the threshold B and approaches zero, the process proceeds to S309.

  Next, in S309, the controller 14 starts tracking control of the objective lens 5 when the output value of the tracking error signal 104a exceeds the threshold value B and approaches zero in S308. Since the polarity of the tracking error signal 102a is switched in S306, the laser light starts to follow the land area b1 as described with reference to FIG.

  When the tracking control to the groove area a1 is stopped, the possibility that the objective lens 5 continues to follow the groove area center a11 of the rotating optical disk 1 is very low unless the ideal optical disk 1 having no eccentricity is mounted on the optical disk apparatus. Become. Therefore, if the tracking control to the groove area a1 is temporarily stopped and the tracking of the laser beam to the groove area a1 is stopped, the objective lens 5 is somewhat land area b0 or land rather than facing the groove area center a11. Since the force that drives the objective lens 5 in the tracking direction toward the land region b1 is applied to the actuator 6 at this timing, the object lens 5 is accelerated more than necessary. Therefore, tracking control to the land area b1 can be started stably.

  Further, the controller 14 temporarily stops the tracking control for driving the objective lens 5 and tracking the laser beam along the groove area a1 of the optical disc 1 when information is not recorded or reproduced. The tracking of the laser beam to the groove area a1 is stopped, the polarity of the tracking error signal 102a is reversed, and the kick control signal for accelerating the objective lens 5 in the tracking direction is output as the tracking drive signal 106a, and the tracking control is resumed. The laser beam starts to follow the land area b1 which is an intermediate area between the first groove area a1 of the optical disc 1 and the second groove area a2 adjacent to the first groove area a1. As a result, the optical disk apparatus of the present embodiment stops the tracking of the laser beam to the groove area a1, and drives the objective lens 5 toward the land area b1 adjacent to the groove area a1 that has been tracked so far. Then, since the tracking control is started after the objective lens 5 is surely brought close to the adjacent land area b1, the objective lens 5 is placed in the land area b1 located immediately next to the groove area a1 that has been followed so far. It can be made to follow reliably.

  In S310, the controller 14 ends the intermediate region tracking process when the laser beam starts following the land region b1 in S309.

  As described above, in the optical disk apparatus according to the present embodiment, when information is not recorded or reproduced, the tracking control is temporarily stopped to stop the tracking of the laser beam to the groove area a1, and the tracking error signal 102a. And the tracking control is resumed after the kick signal is output to the tracking drive signal 106a, and the tracking of the laser beam to the land region b1 located immediately next to the groove region a1 that has been followed up to then is performed. Start.

  Next, the information track following resumption processing in S107 of FIG. 5 and S207 of FIG. 6 will be described with reference to FIG.

  FIG. 9 is a timing chart of the information track following resumption process of the optical disc apparatus according to the first embodiment. 9, the horizontal axis indicates time, FIG. 9A shows the tracking error signal 104a, FIG. 9B shows the tracking drive signal 106a, FIG. 9C shows the switching signal 105a, 9 (d) shows the behavior of the laser beam. Since the laser light is collected by the objective lens 5, the behavior of the laser light corresponds to the behavior of the objective lens 5.

  Until the time t201, the optical disc apparatus of the present embodiment is not recording or reproducing information on the optical disc 1, and the laser beam is incident on the land area b1 of the optical disc 1 as shown in FIG. Tracking control to be followed is performed. Further, as shown in FIG. 9C, the output of the switching signal 105a for switching the switch 1202 described with reference to FIG. 2 is a high output.

  At time t201, as shown in FIG. 9B, the tracking control for making the output of the tracking drive signal 106a zero and tracking the laser light along the land area b1 of the optical disc 1 is temporarily stopped and The laser beam tracking to the land area b1 is stopped.

  From time t201 to time t202, as shown in FIG. 9D, after the tracking control is stopped, the objective lens 5 is stationary with respect to the actuator 6, so that the objective lens is affected by the influence of the eccentricity of the information track of the optical disc 1. The lens 5 is displaced in the tracking direction from the state relatively facing the land area center b11, and in the example shown in FIG. 9D, the lens 5 is somewhat moved to the first land area b1 and the first land area b1. The state approaches the groove area a1, which is an information track between the adjacent second land area b0. Accordingly, as shown in FIG. 9A, the output value of the tracking error signal 104a moves away from zero.

  At time t202, as shown in FIG. 9B, output of the kick signal to the tracking drive signal 106a is started. When the kick signal is output, the objective lens 5 is accelerated toward the groove area a1 in the tracking direction.

  From time t202 to time t203, as shown in FIG. 9B, until the output of the kick signal is stopped, as shown by the behavior of the laser light in FIG. Accelerate in the tracking direction. After stopping the output of the kick signal, the objective lens 5 moves in the tracking direction at a substantially constant speed. Accordingly, as shown in FIG. 9A, the output value of the tracking error signal 104a is further away from zero, approaches the threshold value -A, and exceeds the threshold value -A. When the controller 14 detects that the output value of the tracking error signal 104a exceeds the threshold value -A, the controller 14 switches the output of the switching signal 105a at time t203 and sets the threshold value of the tracking error signal 104a to -A. Change to -B with reverse sign.

  At time t203, as shown in FIG. 9C, the output of the switching signal 105a is set to Low output, and the switch 1202 described with reference to FIG. 2 is switched to configure a servo circuit that does not include the inverter 1201. The polarity of the tracking error signal 102a is switched. When the polarity of the tracking error signal 102a is switched, as shown in FIG. 9A, the output value of the tracking error signal 104a input to the controller 14 is inverted, and the positive and negative polarities of the waveform are reversed. To return to the original state.

  From time t203 to time t204, the objective lens 5 further moves in the tracking direction as represented by the behavior of the laser light in FIG. When the center of the laser beam moves from the first land area b1 to the groove area a1 which is an information track between the first land area b1 and the second land area b0 adjacent to the first land area b1. Thereafter, as shown in FIG. 9A, the output value of the tracking error signal 104a approaches zero.

  At time t204, as shown in FIG. 9B, output of a brake signal to the tracking drive signal 106a is started. When a brake signal having a polarity opposite to that of the kick signal is output, the movement of the objective lens 5 in the tracking direction is decelerated.

  From time t204 to time t205, as shown in FIG. 9B, until the brake signal output is stopped, as shown by the behavior of the laser light in FIG. Movement in the tracking direction is decelerated. After stopping the output of the brake signal, the objective lens 5 moves at a substantially constant speed in the tracking direction and approaches the groove region center a11. As a result, as shown in FIG. 9A, the output value of the tracking error signal 104a further approaches zero and approaches the threshold −B.

  At time t205, when the output value of the tracking error signal 104a exceeds the threshold value −B and approaches zero, the tracking control of the objective lens 5 is resumed assuming that the center of the laser light has approached the groove area center a11. Since the polarity of the tracking error signal 102a is switched at time t203, the laser light starts to follow the groove area a1, as shown in FIG. 9D.

  As described above, in the optical disk apparatus according to the present embodiment, the controller 14 drives the objective lens 5 to track the laser light along the land area b1 of the optical disk when information is not recorded or reproduced. The control is temporarily stopped, the tracking of the laser beam to the land region b1 is stopped, the polarity of the tracking error signal 102a is reversed, and then the tracking control is resumed to start the tracking of the laser beam to the groove region a1.

  If the polarity of the tracking error signal 102a is reversed while tracking control of the objective lens 5 to the land area b1 is performed, the actuator 6 is controlled by the actuator 6 in order to control the objective lens 5 to follow the groove area a1. Is driven in the tracking direction toward the groove region a1. This force continues to act on the actuator 6 until the laser light condensed by the objective lens 5 reaches the groove region center a11 from the state near the land region center b11. For this reason, the objective lens 5 is accelerated more than necessary in the tracking direction with respect to the optical disc 1, and continues to move without decelerating even after passing through the groove area center a11, and tracking control to the groove area a1 can be started. It may not be possible.

  When the tracking control to the land area b1 is stopped, the possibility that the objective lens 5 continues to follow the land area center b11 of the rotating optical disk 1 is very low unless the ideal optical disk 1 having no eccentricity is mounted on the optical disk apparatus. Become.

  Therefore, once the tracking control to the land area b1 is stopped and the tracking of the laser beam to the land area b1 is stopped, the objective lens 5 is somewhat to the groove area a1 or groove rather than facing the land area center b11. Since the force that drives the objective lens 5 in the tracking direction toward the groove region a1 is exerted on the actuator 6 at this timing, the object lens 5 is accelerated more than necessary. Therefore, tracking control to the groove area a1 can be started stably.

  Further, as shown in FIG. 9B, the controller 14 drives the objective lens 5 to follow the laser beam along the land area b1 of the optical disk 1 when information is not recorded or reproduced. The tracking control to be stopped is temporarily stopped, the tracking of the laser beam to the first land area b1 is stopped, the polarity of the tracking error signal 102a is reversed, and the kick signal for accelerating the objective lens 5 in the tracking direction is used as the tracking drive signal. Tracking control is resumed after output as 106a, and laser is applied to the groove area a1, which is an information track between the first land area b1 of the optical disc 1 and the second land area b0 adjacent to the first land area b1. Start following the light.

  As a result, the optical disk apparatus of the present embodiment stops following the laser beam to the land area b1, and drives the objective lens 5 toward the groove area a1 adjacent to the land area b1 that has been followed so far. Then, since the tracking control is started after the objective lens 5 is surely brought close to the adjacent groove area a1, the objective lens 5 is placed in the groove area a1 located immediately next to the land area b1 that has been followed so far. It can be made to follow reliably.

  Hereinafter, control when performing the above-described information track follow-up restart process will be described with reference to FIG.

  FIG. 10 is a flowchart of the information track following resumption process of the optical disc apparatus according to the first embodiment.

  In S401, the controller 14 starts an information track following resumption process. At this time, the laser light follows the land area b1 of the optical disc 1 as shown in FIG. 9D, for example.

  First, in S402, the controller 14 stops the tracking control of the objective lens 5, and stops the tracking of the laser light to the land area b1. When the tracking control is stopped, the objective lens 5 is generally shifted from the state facing the land region center b11 in the tracking direction and is brought close to the groove region a1 or the groove region a2 to some extent.

  Next, in S403, the controller 14 outputs a kick signal to the tracking drive signal 106a. When the kick signal is output, the objective lens 5 is accelerated in the tracking direction. When the objective lens 5 moves in the tracking direction and moves away from the land area center b11, the output value of the tracking error signal 104a moves away from zero and approaches the threshold −A.

  Next, in S404, the controller 14 determines whether or not the output value of the tracking error signal 104a being measured exceeds the threshold value -A, and repeats the processing of S404 as long as the output value does not exceed the threshold value -A. Wait until threshold-A is exceeded. On the other hand, if the output value of the tracking error signal 104a exceeds the threshold value -A, the process proceeds to S405.

  In S405, when the output value of the tracking error signal 104a exceeds the threshold value -A in S404, the controller 14 changes the threshold value of the tracking error signal 104a to a threshold value -B having an opposite sign to the threshold value -A.

  Further, in S406, when the output value of the tracking error signal 104a exceeds the threshold value -A in S404, the controller 14 switches the switch 1202 described with reference to FIG. 2 by the switching signal 105a to constitute a servo circuit that does not include the inverter 1201. The polarity of the tracking error signal 102a is switched.

  Next, in S407, the controller 14 outputs a brake signal to the tracking drive signal 106a. When the brake signal is output, the objective lens 5 moving in the tracking direction is decelerated. When the objective lens 5 moves in the tracking direction from the land area center b11 and approaches the groove area center a11, the output value of the tracking error signal 104a approaches the threshold −B toward zero.

  Next, in S408, the controller 14 determines whether or not the output value of the tracking error signal 104a being measured exceeds the threshold −B and approaches zero, and repeats the processing of S408 as long as the threshold −B is not exceeded. , And wait until the output value exceeds the threshold −B and approaches zero. On the other hand, if the output value of the tracking error signal 104a exceeds the threshold value −B and approaches zero, the process proceeds to S409.

  Next, in S409, the controller 14 starts tracking control of the objective lens 5 when the output value of the tracking error signal 104a exceeds the threshold value −B and approaches zero in S408. Since the polarity of the tracking error signal 102a is switched in S406, the laser beam starts to follow the groove area a1.

  When the tracking control to the land area b1 is stopped, the possibility that the objective lens 5 continues to follow the land area center b11 of the rotating optical disk 1 is very low unless the ideal optical disk 1 having no eccentricity is mounted on the optical disk apparatus. Become. Therefore, once the tracking control to the land area b1 is stopped and the tracking of the laser beam to the land area b1 is stopped, the objective lens 5 is somewhat to the groove area a1 or groove rather than facing the land area center b11. Since the force that drives the objective lens 5 in the tracking direction toward the groove region a1 is exerted on the actuator 6 at this timing, the object lens 5 is accelerated more than necessary. Therefore, tracking control to the groove area a1 can be started stably.

  Further, the controller 14 temporarily stops the tracking control for driving the objective lens 5 to follow the laser beam along the land area b1 of the optical disc 1 when information is not recorded or reproduced. The tracking of the laser beam to the land region b1 is stopped, the polarity of the tracking error signal 102a is reversed, and the kick control signal for accelerating the objective lens 5 in the tracking direction is output as the tracking drive signal 106a. The laser beam starts to follow the groove area a1 which is an information track between the first land area b1 of the optical disc 1 and the second land area b0 adjacent to the first land area b1. As a result, the optical disk apparatus of the present embodiment stops following the laser beam to the land area b1, and drives the objective lens 5 toward the groove area a1 adjacent to the land area b1 that has been followed so far. Then, since the tracking control is started after the objective lens 5 is surely brought close to the adjacent groove area a1, the objective lens 5 is placed in the groove area a1 located immediately next to the land area b1 that has been followed so far. It can be made to follow reliably.

  In S410, the controller 14 ends the information track tracking resumption process when the laser beam starts tracking the groove area a1 in S409.

  As described above, in the optical disc apparatus of the present embodiment, when information is not recorded or reproduced, the tracking control is temporarily stopped to stop the tracking of the laser beam to the land region b1, and the tracking error signal 102a. And the tracking control is resumed after the kick signal is output to the tracking drive signal 106a, and the tracking of the laser beam to the groove area a1 located immediately adjacent to the land area b1 that has been followed up to that point is performed. Start.

  Next, an example using the processing of the present invention will be described with reference to FIGS.

  FIG. 11 is a timing chart showing an example of processing using the present invention in the optical disc apparatus.

  In FIG. 11, the horizontal axis indicates time, and FIGS. 11A and 11B show the laser light focused by the objective lens 5 in the processing using the present invention during the startup process of the optical disc apparatus. Starts following the land area, which is the intermediate area, from the groove area that was originally following when recording and reproducing information to and from the optical disc 1, and again according to the command from the host device. Shows a procedure for returning to a recordable / reproducible state in which information can be recorded and reproduced.

  In the processing using the present invention, the laser beam is caused to follow the land area for a predetermined period during which no information is recorded or reproduced. Thereby, the current consumption of the optical disk apparatus can be reduced. Further, using the intermediate area tracking process described with reference to FIGS. 7 and 8, it is located immediately next to the groove area that was originally tracked during the start-up process of the optical disk apparatus and the recording and reproduction of information on the optical disk 1. The laser beam is caused to follow the land area for a predetermined period. As a result, it is possible to quickly start recording and reproducing information on the optical disc 1.

  Here, the groove area a1 as described with reference to FIG. 7 where the laser beam originally followed at the time of start-up processing of the optical disk apparatus and at the time of recording and reproducing information on the optical disk 1 is defined as the groove area X, which is located immediately next to it. The land area b1 described with reference to FIG. 7 is defined as a land area X ′. Further, an arbitrary land area that is not immediately adjacent to the groove area X is defined as a land area Y ′, and a groove area positioned immediately adjacent to the land area Y ′ is defined as a groove area Y.

  In the example shown in FIG. 11A, the laser light is made to follow an arbitrary land area Y ′ by the tracking process to an arbitrary intermediate area.

  The controller 14 obtains an address indicating the position on the optical disc 1 from the following groove area X at the time of starting processing of the optical disc device or recording or reproducing information on the optical disc 1, and which laser beam is on the optical disc 1. It knows if it is following the position. However, since an address cannot be acquired from the land area of the optical disc 1, the controller 14 does not know which position on the optical disc 1 the laser beam follows when starting to follow an arbitrary land area Y ′.

  At this time, for example, when a command “can record information in the groove area X” comes from the host device, the controller 14 first performs the information track tracking resumption process as described with reference to FIGS. The laser beam condensed by the objective lens 5 is moved to the groove area Y immediately adjacent to the land area Y ′. Time T1 is required from the arrival of the command to the end of the information track follow-up restart process.

  Since the controller 14 can acquire an address from the groove area of the optical disc 1, after moving to the groove area Y, the controller 14 acquires the address of the groove area Y. This makes it possible to grasp the position on the optical disc 1 that the laser beam follows. Acquisition of the address from the optical disc 1 requires time T2.

  When the address of the groove area Y is acquired, the controller 14 calculates the number of seeks representing the amount of movement to the target groove area X. Time T3 is required to calculate the number of seeks.

  Finally, the controller 14 performs a seek operation, which is the movement of the laser beam, based on the calculation result, starts tracking the laser beam to the target groove region X on which information is to be recorded, and receives information on the groove region X. Start recording. A seek operation from the groove area Y to the groove area X requires time T4.

  That is, when the laser light is made to follow the arbitrary land area Y ′ by the tracking process to an arbitrary intermediate area, the tracking of the laser light to the target groove area X is started after the command arrives. , A total time T1 + T2 + T3 + T4 is required.

  On the other hand, in the example shown in FIG. 11B, the laser light is made to follow the land area X ′ immediately adjacent to the groove area X by the intermediate area following process described with reference to FIGS.

  The controller 14 obtains an address indicating the position on the optical disc 1 from the following groove area X at the time of starting processing of the optical disc device or recording or reproducing information on the optical disc 1, and which laser beam is on the optical disc 1. It knows if it is following the position. When the laser beam is tracked to the land area X ′ immediately adjacent to the groove area X by the intermediate area tracking process described with reference to FIGS. 7 and 8, the controller 14 determines the address of the groove area X that has been tracked. Is stored in the RAM 16. As a result, even when the tracking of the land area X ′ where the address cannot be acquired is started, the state where the position of the groove area X located immediately adjacent to the optical disk 1 is grasped is maintained.

  At this time, for example, when a command “can record information in the groove area X” comes from the host device, the controller 14 first performs the information track tracking resumption process as described with reference to FIGS. The laser beam condensed by the objective lens 5 is moved to the groove area X immediately adjacent to the land area X ′. A time T1 'is required from the arrival of the command to the end of the information track tracking resumption process.

  Here, since the controller 14 has already stored the address of the groove area X in the RAM 16 during the intermediate area following process, the controller 14 stores the address without acquiring the address from the groove area X of the optical disc 1 again. The position on the optical disc 1 that the laser beam follows can be grasped only by reading the address from the RAM 16. The time required to read the address stored in the RAM 16 is negligible. That is, the address acquisition process shown in FIG. 11A can be omitted, and the time corresponding to T2 can be shortened.

  In addition, since the target groove area where information is to be recorded here is the groove area X that was originally followed by the laser beam, the controller 14 substantially performs the groove immediately after the above-described information track tracking restart process. Recording of information in the area X can be started.

  That is, when the laser beam is made to follow the land region X ′ immediately adjacent to the groove region X by the intermediate region tracking process described with reference to FIGS. 7 and 8, the target groove region X is received after the command arrives. The time required to start the tracking of the laser beam to is only the time T1 ′.

  Here, the time required from the arrival of the command shown in FIG. 11A to the end of the information track tracking restart process and the time required from the arrival of the command shown in FIG. 11B to the end of the information track tracking restart process are shown. If we consider that the times are only about the same, then T1≈T1 ′. For this reason, as shown in FIG. 11B, when the intermediate region tracking process described with reference to FIGS. 7 and 8 is performed, the laser light is made to follow the land region X ′ immediately adjacent to the groove region X. In this case, as shown in FIG. 11A, it is possible to obtain the address from the optical disc 1 as compared with the case where the tracking process to an arbitrary intermediate area is performed to cause the laser beam to follow an arbitrary land area Y ′. Since the tracking of the laser beam to the groove area X can be started earlier by the calculation of the number of seeks and the sum T2 + T3 + T4 of the time required for the seek operation, information recording and reproduction on the optical disc 1 can be started earlier. .

  If the intermediate region tracking process described with reference to FIGS. 7 and 8 is performed and the laser light is made to follow the land region X ′ immediately adjacent to the groove region X, the groove region X that originally followed Even when recording or reproduction is started in a different arbitrary groove area in accordance with a command from the host device, address acquisition processing can be omitted, and information recording and reproduction on the optical disc 1 can be started earlier. it can. This will be described below with reference to FIG.

  FIG. 12 is a timing chart showing an example of processing using the present invention in the optical disc apparatus.

  In FIG. 12, the horizontal axis indicates time, and FIGS. 12A and 12B show the laser light focused by the objective lens 5 in the process using the present invention during the startup process of the optical disk apparatus. Start from the groove area that was originally followed when recording or reproducing information to or from the optical disc 1 to the land area that is the intermediate area, and the groove area X that was originally followed in response to a command from the host device. The procedure of moving to an arbitrary groove area different from the above and returning to a recordable / reproducible state in which information can be recorded and reproduced is shown.

  Here, the groove area a1 as described with reference to FIG. 7 where the laser beam originally followed at the time of start-up processing of the optical disk apparatus and at the time of recording and reproducing information on the optical disk 1 is defined as the groove area X, which is located immediately next to it. The land area b1 described with reference to FIG. 7 is defined as a land area X ′. Further, an arbitrary land area that is not immediately adjacent to the groove area X is defined as a land area Y ′, and a groove area positioned immediately adjacent to the land area Y ′ is defined as a groove area Y. Further, another arbitrary groove area that is neither the groove area X nor the groove area Y is defined as a groove area Z.

  In the example shown in FIG. 12A, the laser beam is made to follow an arbitrary land area Y ′ by the tracking process to an arbitrary intermediate area.

  The controller 14 obtains an address indicating the position on the optical disc 1 from the following groove area X at the time of starting processing of the optical disc device or recording or reproducing information on the optical disc 1, and which laser beam is on the optical disc 1. It knows if it is following the position. However, since an address cannot be acquired from the land area of the optical disc 1, the controller 14 does not know which position on the optical disc 1 the laser beam follows when starting to follow an arbitrary land area Y ′.

  At this time, for example, when a command “can reproduce the information in the groove area Z” comes from the host device, the controller 14 first performs the information track tracking resumption process as described with reference to FIGS. The laser beam condensed by the objective lens 5 is moved to the groove area Y immediately adjacent to the land area Y ′. Time T5 is required from the arrival of the command to the end of the information track tracking resumption process.

  Since the controller 14 can acquire an address from the groove area of the optical disc 1, after moving to the groove area Y, the controller 14 acquires the address of the groove area Y. This makes it possible to grasp the position on the optical disc 1 that the laser beam follows. Acquisition of the address from the optical disc 1 requires time T6.

  When the address of the groove area Y is acquired, the controller 14 calculates the number of seeks representing the amount of movement to the target groove area Z. Time T7 is required to calculate the number of seeks.

  Finally, the controller 14 performs a seek operation, which is the movement of the laser beam, based on the calculation result, starts tracking the laser beam to the target groove region Z where information is to be reproduced, and updates the information in the groove region Z. Start playback. A seek operation from the groove area Y to the groove area Z requires time T8.

  That is, when the laser light is made to follow the arbitrary land area Y ′ by the tracking process to an arbitrary intermediate area, the tracking of the laser light to the target groove area Z is started after the command arrives. , A total of T5 + T6 + T7 + T8 is required.

  On the other hand, in the example shown in FIG. 12B, the laser light is made to follow the land area X ′ immediately adjacent to the groove area X by the intermediate area following process described with reference to FIGS.

  The controller 14 obtains an address indicating the position on the optical disc 1 from the following groove area X at the time of starting processing of the optical disc device or recording or reproducing information on the optical disc 1, and which laser beam is on the optical disc 1. It knows if it is following the position. When the laser beam is tracked to the land area X ′ immediately adjacent to the groove area X by the intermediate area tracking process described with reference to FIGS. 7 and 8, the controller 14 determines the address of the groove area X that has been tracked. Is stored in the RAM 16. As a result, even when the tracking of the land area X ′ where the address cannot be acquired is started, the state where the position of the groove area X located immediately adjacent to the optical disk 1 is grasped is maintained.

  At this time, for example, when a command “can reproduce the information in the groove area Z” comes from the host device, the controller 14 first performs the information track tracking resumption process as described with reference to FIGS. The laser beam condensed by the objective lens 5 is moved to the groove area X immediately adjacent to the land area X ′. A time T5 'is required from the arrival of the command to the end of the information track following resumption process.

  Here, since the controller 14 has already stored the address of the groove area X in the RAM 16 during the intermediate area tracking process, the controller 14 stores the address without acquiring the address from the groove area X of the optical disc 1 again. The position on the optical disc 1 that the laser beam follows can be grasped only by reading the address from the RAM 16. The time required to read the address stored in the RAM 16 is negligible. That is, the address acquisition process shown in FIG. 12A can be omitted, and the time corresponding to T6 can be shortened.

  When the address of the groove area X is read from the RAM 16, the controller 14 calculates the number of seeks representing the amount of movement to the target groove area Z. Time T7 'is required for calculating the number of seeks.

  Finally, the controller 14 performs a seek operation, which is the movement of the laser beam, based on the calculation result, starts tracking the laser beam to the target groove region Z where information is to be reproduced, and updates the information in the groove region Z. Start playback. The seek operation from the groove area X to the groove area Z requires time T8 '.

  That is, when the laser beam is caused to follow the land area X ′ immediately adjacent to the groove area X by the intermediate area following process described with reference to FIGS. 7 and 8, the target groove area Z is received after the command arrives. The total time required to start the tracking of the laser beam to is T5 ′ + T7 ′ + T8 ′.

  Here, considering the relationship between the time required for each processing of FIG. 12A and FIG. 12B as T5≈T5 ′, T7≈T7 ′, and T8≈T8 ′, FIG. As shown in FIG. 12, the intermediate region tracking process described with reference to FIGS. 7 and 8 is performed to cause the laser light to follow the land region X ′ immediately adjacent to the groove region X as shown in FIG. As shown in FIG. 9), the time T6 required to obtain the address from the optical disk 1 is earlier than the case where the tracking process to an arbitrary intermediate area is performed to cause the laser beam to follow an arbitrary land area Y ′. Since the tracking of the laser beam to the groove area Z can be started, information recording and reproduction with respect to the optical disc 1 can be started earlier.

  In FIG. 12B, when a command arrives from the host device, the information track tracking restart process is performed to move the laser beam to the groove area X immediately adjacent to the land area X ′, and then the number of seeks is calculated. The seek operation from the groove area X to the groove area Z was performed. However, since the controller 14 keeps track of the address of the immediately adjacent groove area X when the command arrives, the target area is considered in consideration of following the land area X ′ immediately adjacent to the groove area X. The number of seeks up to the groove area Z can be calculated. Simultaneously with the calculation of the number of seeks, if the polarity of the tracking error signal 102a is reversed, the tracking of the laser beam to the groove region Z can be started without performing the information track tracking resumption process over time T5 ′. It can be implemented similarly.

  As described above with reference to FIGS. 11 and 12, in the optical disc apparatus according to the present embodiment, the tracking of the laser beam to the first groove area X is stopped, and the first groove area X and the second groove area X are stopped. By causing the laser light to follow the land area X ′, which is an intermediate area with the groove area, the optical disc apparatus can grasp the position on the optical disc 1 of the first groove area X that has been followed by the laser light. If the laser beam follows the land area X ′, which is an intermediate area located immediately next to the first groove area X, and stands by, a new recording or reproduction command is received from the host device. Since access control to the target groove area can be started without re-acquisition of position information on the optical disc 1, information recording and reproduction on the optical disc 1 can be resumed quickly. .

  In the optical disk apparatus according to the present embodiment, as shown in FIG. 2, tracking drive is performed in the subsequent stage of the circuit of the inverter 1201 for inverting the polarity of the tracking error signal 102a and the switch 1202 for switching the circuit. Although the tracking filter 1203 for generating the signal 106 a is provided, the position of the inverter 1201 may be before or after the tracking filter 1203 as long as it can be combined with the switch 1202 controlled by the controller 14 in the circuit. For example, as shown in the detailed block diagram of the servo processing unit in the optical disk apparatus according to the first embodiment in FIG. 13, the configuration in which the inverter 1201 and the switch 1202 are provided after the tracking filter 1203 in the circuit is also similarly implemented. Is possible.

  As described above, according to the optical disc apparatus of the present embodiment, the first information track and the second information track adjacent to the first information track on the optical disc for a predetermined period during which no information is recorded or reproduced. By supplying the laser beam to the intermediate area with the information track, the laser beam is made to follow the unmarked part of the optical disk to reduce the mixing of high-frequency components into the servo error signal, thereby supplying the actuator that drives the objective lens. Since the generation of unnecessary drive current is suppressed, the current consumption of the optical disc apparatus can be reduced.

  The optical disk apparatus and the control method thereof according to the present invention can be applied to applications such as an optical disk apparatus that requires a reduction in current consumption even in a standby state in which laser light follows the information recording surface of the optical disk. .

1 is a block diagram of an optical disc apparatus according to an embodiment of the present invention. Detailed block diagram of a servo processing unit in the optical disc apparatus of the first embodiment The figure explaining the tracking control in the optical disk apparatus of Embodiment 1. Explanatory drawing of the principle of the optical disc apparatus of Embodiment 1 Flowchart after the start-up process of the optical disc apparatus of Embodiment 1 is completed Flowchart after the end of the recording / playback process of the optical disc apparatus of the first embodiment Timing chart of intermediate area follow-up process of optical disc apparatus of Embodiment 1 Flowchart of intermediate area tracking process of optical disc apparatus of Embodiment 1 Timing chart of information track follow-up resumption process of optical disc apparatus of Embodiment 1 Flowchart of information track follow-up resuming process of optical disc apparatus of Embodiment 1 Timing chart showing an example of processing using the present invention in an optical disc apparatus Timing chart showing an example of processing using the present invention in an optical disc apparatus Detailed block diagram of a servo processing unit in the optical disc apparatus of the first embodiment The figure which shows each signal in the conventional optical disk apparatus

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Pickup module 3 Spindle motor 4 Lens holder 5 Objective lens 6 Actuator 7 Carriage 8 Optical pick-up 9 Feed part 10 Feed motor 11 Analog signal processing part 12 Servo processing part 13 Motor drive part 14 Controller 15 ROM
16 RAM
101 Pickup output signal 102 Servo error signal 102a Tracking error signal 103 Spindle FG signal 104 Servo processing signal 104a Tracking error signal 105 Control signal 105a Switching signal 106 Pickup module control signal 106a Tracking drive signal 107 Pickup module drive signal 1201 Inverter 1202 Switch 1203 Tracking Filter a1 Groove area a11 Groove area center a2 Groove area a21 Groove area center b0 Land area b01 Land area center b1 Land area b11 Land area center

Claims (10)

An objective lens for condensing a laser beam for recording and reproducing information on an optical disc;
A signal processing unit that generates a tracking error signal based on reflected light from the optical disc;
A servo processing unit that generates a tracking drive signal for driving the objective lens in a tracking direction based on the tracking error signal;
A control unit that controls the servo processing unit to cause the laser light focused by the objective lens to follow the information track of the optical disc, and
The controller is
The laser beam is caused to follow an intermediate area between a first information track of the optical disc and a second information track adjacent to the first information track for a predetermined period when the information is not recorded or reproduced. An optical disk device. The controller is
2. The optical disc apparatus according to claim 1, wherein the laser beam is caused to follow the intermediate area by reversing the polarity of the tracking error signal for a predetermined period when the information is not recorded or reproduced. The controller is
The laser beam follows the intermediate area by reversing the polarity of the tracking error signal for a predetermined period when the information is not recorded or reproduced.
2. The polarity of the tracking error signal is reversed again when a new information recording or reproduction command arrives from a host device connected to the optical disk device during the predetermined period. Optical disk device. The controller is
When the information is not recorded or reproduced, tracking control for driving the objective lens to cause the laser light to follow the information track of the optical disc is temporarily stopped, and the laser light to the information track is temporarily stopped. 2. The optical disk apparatus according to claim 1, wherein the tracking of the laser beam is stopped and the tracking control is resumed after inverting the polarity of the tracking error signal to start the tracking of the laser beam to the intermediate region. The information track is the first information track, stops following the laser beam to the first information track, and the laser is placed in an intermediate area between the first information track and the second information track. 5. The optical disk device according to claim 1, wherein the optical disk device is caused to follow light. The controller is
When the information is not recorded or reproduced, the tracking control for causing the laser beam to follow the information track of the optical disc is temporarily stopped to stop the tracking of the laser beam to the first information track. And reversing the polarity of the tracking error signal and outputting a kick signal for accelerating the objective lens in the tracking direction as the tracking drive signal, and then resuming the tracking control to resume the first information track of the optical disc and the first information track. 2. The optical disc apparatus according to claim 1, wherein the laser beam starts to follow an intermediate area with a second information track adjacent to one information track. The predetermined period is
After a certain period of time has elapsed after the start-up process of the optical disk device is completed,
2. The optical disk apparatus according to claim 1, wherein the optical disk apparatus further includes a period until a follow-up of the laser beam to the information recording surface of the optical disk stops after a predetermined time has elapsed. The predetermined period is
After a certain amount of time has elapsed after the recording or playback of the information has been completed,
2. The optical disk apparatus according to claim 1, wherein the optical disk apparatus further includes a period until a follow-up of the laser beam to the information recording surface of the optical disk stops after a predetermined time has elapsed. 2. The optical disk apparatus according to claim 1, wherein when an optical disk on which groove recording is performed, in which information is recorded only in the groove area which is the information track, is mounted, the intermediate area is a land area. Condensing the laser beam to record and reproduce information on the optical disc,
A tracking error signal is generated based on the reflected light from the optical disc,
Generate a tracking drive signal for driving the objective lens in the tracking direction based on the tracking error signal,
Control the servo processing unit to cause the laser beam condensed by the objective lens to follow the information track of the optical disc,
The laser beam is caused to follow an intermediate area between a first information track of the optical disc and a second information track adjacent to the first information track for a predetermined period when the information is not recorded or reproduced. A method for controlling an optical disk apparatus.

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