JP2003296947A - Optical disk apparatus, and method for controlling movement of pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk apparatus provided with a feed mechanism wherein a motor is not early deteriorated for suppressing the increase in the design and manufacturing costs without wasteful power consumption and to provide a method for controlling the movement of a pickup means. <P>SOLUTION: A feed motor 12 moves a pickup 11 of the optical disk apparatus nearly over the entire moving range of the pickup 11, an address information generating circuit 17 detects a position at which a value or a load or a value equivalent thereto detected by a TE (Tracking Error) signal generating circuit 14 is a prescribed value or over, and a load maximum position storage memory 29 stores the detected position information. Then, when the feed motor 12 again moves the pickup 11, the apparatus allows the feed motor 12 to move the pickup 11 at a prescribed driving force at positions other than the position stored in the load maximum position storage memory 19 and at a more than prescribed driving force at the position stored in the load maximum position storage memory 19. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickup movement control technique for an optical disk device.

[0002]

2. Description of the Related Art An optical disc apparatus irradiates a laser beam onto an optical disc while moving an optical pickup in the radial direction of the optical disc when recording information on the optical disc or reading information recorded on the optical disc. Trace data tracks and pregrooves recorded on an optical disc. Then, when recording information, the reflected light is received by the light receiving element to confirm whether the recording is properly performed, and feedback is performed so that the recording is always performed in the optimum state. . Further, when reproducing information, the reflected light is received by the light receiving element and the signal reproduction processing is performed.

A feed mechanism for moving the optical pickup in the radial direction of the optical disc as described above generally has a structure as shown in FIG. Figure 6
It is a block diagram which showed the outline of the feed mechanism of an optical pickup. In the feed mechanism 100 shown in FIG. 6A, an optical pickup 101 is mounted on a pickup unit 104 which is a moving body supported by two shafts 102 and 103 so as to face the recording surface of the optical disc D. There is. Further, the driving force of the feed motor 105 is equal to that of the feed screw 106.
It is configured to be transmitted to the rack and pinion 107 via the so as to move the entire pickup 104 in the radial direction of the optical disc D. A stepping motor or a DC motor is used as the feed motor.

Further, as shown in FIG. 6B, the feed mechanism of the feed motor may be composed of a linear motor. That is, the feed mechanism 110 is
The optical pickup 111 is mounted on a pickup 114 supported by two shafts 112 and 113 so as to face the recording surface of the optical disc D. A drive coil 115 is attached to the pickup 114. Further, the drive coil 115 has a center yoke 1
16 penetrates through, and magnets 117 and 118 are provided facing the center yoke 116. The linear motor 120 includes a drive coil 115, a center yoke 1
16, a magnet 117, a magnet 118, and a side yoke 119. Pickup 1
14 is configured to move in the radial direction of the optical disc D by a driving force generated in the linear motor 120 by passing a current through the driving coil 115.

[0005]

In the feed mechanism 100 shown in FIG. 6 (A), the pickup 104 is in contact with the shafts 102 and 103 supporting the pickup 104 by the bearings 108 and 109. Therefore, when the pickup 104 moves, the shafts 102 and 103 move to the bearing 1
Since it slides with 08 and 109, frictional resistance (load) is generated between them. Further, in the feed mechanism 110 shown in FIG. 6B, when the pickup 114 moves, the shafts 112 and 113 slide with the bearings 121 and 122, so that frictional resistance (load) is generated between them. To do. Further, the frictional resistance generated between the shaft and the bearing shows different values depending on the position of the shaft and the ambient temperature in both the feed mechanism 100 and the feed mechanism 110.
In addition, in the feed mechanism 100, the pickup 104
The driving force for moving the is transmitted from the end on the shaft 102 side. Therefore, the shaft 102 and the shaft 103 have different frictional resistances.

Therefore, the optical disk device provided with the feed mechanism 100 or the feed mechanism 110 is
When the information is recorded or reproduced, the feed motor is designed to be driven by the driving voltage or the driving current which causes no problem in the trace operation even in the portion having the highest load. Therefore, even in a portion having a low load, driving is performed with a drive voltage or a drive current adapted to the portion having the highest load, resulting in a large power consumption of the optical disc device. Further, in a portion where the load is low, an excessive amount of current flows through the feed motor, so that the amount of heat generated is large and the feed motor deteriorates quickly.

The above-mentioned problem can be solved by tightening the specifications for load variations such as frictional resistance in the feed mechanism of the optical disk device to reduce the load variations. However, the finishing accuracy and the assembly accuracy of the shafts and bearings used in the feed mechanism of the optical disk device must be made higher than the current one, and the manufacturing cost of the optical disk device increases. In the case of the structure like the feed mechanism 100, the pickup 1
It is necessary to change the configuration so that the driving force is evenly transmitted to 14, which increases the design cost.

In order to solve the above problems, the present invention suppresses an increase in design cost and manufacturing cost, consumes no unnecessary power, and has an optical disk device provided with a feed mechanism that prevents the motor from deteriorating early. Another object of the present invention is to provide a movement control method for the pickup means.

[0009]

The present invention has the following structure as means for solving the above problems.

(1) Pick-up means for irradiating the optical disk with a light beam facing the recording surface of the optical disk, driving means for moving the pick-up means within a movable range in the radial direction of the optical disk, and the pick-up means. Position detecting means for sequentially detecting the position; storage means for storing position information of the pickup means such that a load at each position when the driving means moves the pickup means is a predetermined magnitude or more; The driving means is controlled so as to move the pickup means with a predetermined driving force at a position other than the position stored by the storage means and with a driving force larger than the predetermined driving force at the position stored by the storage means. And a control means.

In this structure, the position detecting means sequentially detects the position of the pickup means. Further, the storage means stores position information of the pickup means at which the load is equal to or more than a predetermined value. Further, the control means uses a predetermined driving force at a position other than the position stored in the storage means, and a driving force larger than the predetermined driving force at the position stored in the storage means.
The pickup means is moved to the drive means. Therefore, in the optical disk device, when the pickup means is moved, when it comes to a position with a large load, feedforward control is performed to increase the driving force immediately before it, so that it is not necessary to always drive with a large driving force as in the conventional case. Even better, and it becomes possible to reduce power consumption. In addition, it is possible to ease the load variation specifications of the optical disk device.

(2) Pick-up means for irradiating the optical disk with a light beam facing the recording surface of the optical disk, driving means for moving the pick-up means within a movable range in the radial direction of the optical disk, and the pick-up means of the pick-up means. Position detection means for sequentially detecting the position, storage means for storing the magnitude of the load at each position when the drive means moves the pickup means, and the detected position of the pickup means by the position detection means At the same time, the control means for reading the magnitude of the load at the current position of the pickup means from the storage means and controlling the drive means so as to move the pickup means with a driving force according to the magnitude of the load. And are provided.

In this structure, the drive means moves the pickup means within the movable range of the optical disc in the radial direction, and stores the magnitude of the load at each position at that time in the storage means. Further, the position detecting means detects the current position of the pickup means when the pickup means moves, and the control means reads the magnitude of the load at the current position of the pickup means from the storage means and determines the magnitude of the load according to the magnitude of the load. The driving means is controlled so as to move the pickup means by the driving force. Therefore, when moving the pickup means, when the optical disc device moves to a position where the magnitude of the load fluctuates, the optical disc device performs a feedforward control that changes the driving force immediately before that, so that the driving force appropriate for that position is adjusted. Thus, the pickup means can be moved and power consumption can be suppressed. In addition, it is possible to ease the load variation specifications of the optical disk device.

(3) The drive means includes load detection means for detecting the magnitude of the load at each position when the pickup means is moved, and the pickup means, when the optical disc is irradiated with a light beam, The tracking drive signal indicating the tracking state is output, and the load detection means uses the tracking drive signal as a value for detecting the magnitude of the load.

In this structure, the load detecting means uses the tracking drive signal indicating the tracking state output by the pickup means when the optical disc is irradiated with the light beam, as a value representing the magnitude of the load. Therefore, it is not necessary to separately provide a mechanism for detecting the magnitude of the load.

(4) In the above (1), there is provided load detecting means for detecting the magnitude of the load at each position when the driving means moves the pickup means, and the control means comprises the load detecting means. The position detected by the position detecting means when the magnitude of the load detected by is greater than or equal to a predetermined value is stored in the storage means in advance.

In this structure, when the pickup means moves, the control means stores in advance in the storage means the positional information of the pickup means that the magnitude of the load detected by the load detection means becomes a predetermined value or more. For example, at the time of factory shipment, the pickup means is moved in advance over the entire movable range, and the storage means stores the position information of the pickup means at which the magnitude of the load is equal to or larger than a predetermined value. Further, when the operation of the optical disk device is started, the pickup means is moved over the entire movable range, and the storage means stores the position information of the pickup means at which the magnitude of the load is equal to or more than a predetermined value.

(5) In the above (2), the drive means includes a load detection means for detecting the magnitude of the load at each position when the pickup means is moved, and the control means includes the load detection means. And the position detected by the position detecting means when the load is detected are associated with each other and stored in advance in the storage means.

In this structure, the control means causes the storage means to store in advance the position information and the load information of the pickup means stored in the storage means when the pickup means moves. For example, at the time of factory shipment in advance, the pickup means is moved over the entire movable range, and the load value detected by the load detection means and the position detected by the position detection means at the time of the load are set. It is associated and stored in the storage means. Further, at the start of the operation of the optical disc device, the pickup means is moved over the entire movable range so that the load value detected by the load detection means and the position detected by the position detection means at the time of the load are detected. It is associated and stored in the storage means.

(6) In the above (4), the control means stores the position information stored in the storage means, and the detected values of the load detection means and the position detection means when the pickup means actually moves. It is characterized by updating based on.

In this structure, the position information stored in the storage means, that is, the position information in which the load is equal to or more than a predetermined value, is detected by the load detecting means and the position detecting means when the pickup means actually moves. Will be updated based on. Therefore, even if the optical disc is reproduced many times and the magnitude of the load changes due to a temperature change or the like, it is possible to cope with the change.

(7) In the above (5), the control means detects the magnitude of the load stored in the storage means at each position of the pickup means when the pickup means actually moves. And updating based on the values detected by the means and the position detecting means.

In this structure, the value representing the magnitude of the load at each position of the pickup means stored in the storage means is based on the detection values of the load detection means and the position detection means when the pickup means actually moves. Will be updated. Therefore, even if the optical disc is reproduced many times and the magnitude of the load changes due to a temperature change or the like, it is possible to cope with the change.

(8) The storage means is characterized in that the address information recorded on the optical disk is stored as position information of the pickup means.

In this structure, since the address information recorded on the optical disc is used as the position information of the pickup means, it can be stored in the storage means without a separate mechanism for detecting the position information. The address information can be easily detected without increasing the cost.

(9) The storage means stores the drive signal of the drive means or the output signal of the position information detection means as the position information of the pickup means.

In this structure, since the drive signal of the drive means or the output signal of the position information detection means is used as the position information of the pickup means, the position information of the pickup means can be surely detected.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment] FIG. 1 is a block diagram showing a configuration of an optical disk device according to a first embodiment of the present invention. As shown in FIG. 1, the optical disk device 1 includes a spindle motor 10, a pickup 11 which is a pickup means supported by a shaft 9, a feed motor 12 and a feed motor drive circuit 13 which are drive means, and a tracking which is a load detection means. An error signal generation circuit (hereinafter referred to as a TE signal generation circuit) 14, a control signal generation circuit 15, an actuator drive circuit 16, an address information generation circuit 17 which is position detection means, a current position storage memory 18, and a storage means. Large load position storage memory 1
9, a feed drive signal arithmetic circuit 20 as a control unit, and a system control unit 21. The pickup 11 includes an optical pickup 31 and an actuator 32.
Is equipped with.

The spindle motor 10 is a motor for rotating the optical disc D. Further, an optical disk holding mechanism (not shown) including a turntable for holding (chucking) the optical disk D is provided at the tip of the rotary shaft of the spindle motor 10.

The pickup 11 is supported by the shaft 9,
It is configured so that the entire recording surface can be traced in the radial direction of the optical disk D so as to face the recording surface of the optical disk D. The pickup 11 is a laser diode,
An optical pickup 31 including a lens, a mirror, a light receiving element for returning light (reflected light), and the like, and a tracking servo mechanism for operating the optical pickup 31 even when there is eccentricity or undulation of the optical disc D. The actuator 32 and the focus servo mechanism are provided. Further, at the time of recording and reproducing data, the optical disc D is irradiated with a laser beam (light beam), the return light from the optical disc D is received, and the received light signal is an EFM.
(Eight to Fourteen Modulation) Outputs a modulated RF signal. Further, the pickup 11 outputs a tracking drive signal indicating a tracking state when the optical beam is irradiated onto the optical disc D.

The feed motor 12 is a pickup 11
Is traced in the radial direction of the optical disc D while facing the recording surface of the optical disc D.

The feed motor drive circuit 13 drives the feed motor 12 based on the signal from the feed drive signal calculation circuit 20.

The TE signal generating circuit 14 includes the pickup 1
A tracking error signal (hereinafter referred to as a TE signal) is generated from the tracking drive signal output from 1.

The control signal generation circuit 15 generates a control signal by performing phase compensation on the tracking error signal output from the TE signal generation circuit 14 or increasing the gain.

The actuator drive circuit 16 drives the actuator 32 of the pickup 11 based on the high frequency component of the control signal output from the control signal generation circuit 15.

The address information generating circuit 17 decodes time information (address information) from the EFM-modulated RF signal output from the pickup 11 and sequentially generates current position information of the pickup 11.

The current position storage memory 18 stores and updates the current position information of the pickup 11 output from the address information generation circuit 17.

The large load position storage memory 19 stores the position information of the pickup 11 when the low frequency component of the tracking control signal exceeds a certain threshold value.

The feed drive signal operation circuit 20 controls the feed motor drive circuit 13 based on the low frequency component of the control signal output from the control signal generation circuit 15, and outputs the current position storage memory 18. Current position information of pickup 11 and memory 1 for storing large load position
The position information of No. 9 is compared, and the feed drive signal according to the result is output.

The control section 21 controls each section of the optical disc. In addition, the pickup 11, the TE signal generation circuit 14,
A control signal generation circuit 15, an actuator drive circuit 16,
The feed drive signal calculation circuit 20, the feed motor drive circuit 13, and the feed motor 12 form a tracking servo mechanism, and the position of the pickup 11 is feedback-controlled.

In the optical disk device 1 having the above-mentioned structure, the position where the value representing the magnitude of the load when the feed motor 12 moves within the possible range of the pickup 11 is a predetermined value or more is stored as the large load position. It is stored in the memory 19 in advance. The following control is performed at the time of retrace when the actual writing is performed on the optical disc D. That is, when tracing a position other than the position stored in the large load position storage memory 19, the pickup 11 is moved by applying the first driving force (predetermined driving force) to the feed motor 12. The first driving force may not be able to move the pickup 11 smoothly if the load is equal to or greater than a predetermined magnitude, but may move the pickup 11 smoothly if the load is less than that. You can Further, when the position stored in the large load position storage memory 19 is traced again, a second driving force (a driving force equal to or larger than a predetermined driving force) is applied to the feed motor 12. The second driving force can smoothly move the pickup 11 even if the load is a predetermined value or more. In the optical disc device 1, the position stored in the large load position storage memory 19 is monitored, and the driving force is set to the first driving force or the second driving force as described above, and the feedforward control is performed. To do. The feedforward control is a control that applies the second driving force to the feed motor 12 at the same time as or immediately before the position (the position where the load is large) stored in the large load position storage memory 19 is reached. By this control, when the load reaches a place larger than a predetermined value, the feed motor 12 is not delayed.
On the other hand, a sufficient driving force (second driving force) is applied, and the driving force of the feed motor 12 can be reduced in other places where the load is smaller than a predetermined value. Therefore, by changing the driving force of the feed motor 12 according to the magnitude of the load, the pickup 11 can be moved in the entire movable range without rattling, and unnecessary power consumption can be suppressed.

In the optical disc device 1, as a value corresponding to the load value when the pickup 11 is moved,
Use the tracking error signal. The tracking error signal becomes a large signal in proportion to its value when the load during the movement of the pickup 11 is large. Therefore, this value can be used as a value corresponding to the value of the load when the pickup 11 is moved.

When the optical disk device 1 is used, when the feed motor 12 is moved within the movable range of the pickup 11, the magnitude of the load is a predetermined value (threshold value).
It is advisable to obtain the above positions through experiments, for example, at the time of factory shipment. Further, when recording / reproducing data to / from the optical disc (at the time of starting the operation), the pickup 10 is moved to obtain data regarding the magnitude of the load.
It may be obtained before the recording / reproducing operation.

In addition, when using the optical disk device 1, it is advisable to adjust the feedforward control timing in accordance with the responsiveness of the pickup 11 and the feed motor 12. The timing at this time is such that when the load reaches a position where the load is equal to or greater than a predetermined position, the pickup 11
It is the timing to apply the second driving force to the feed motor 12 so that the feed motor 12 moves smoothly without rattling.

In the optical disc device 1, the address information recorded on the optical disc D is used as the position information of the pickup 11. That is, as is well known, C
For reproduction type optical disks such as D-DA and CD-ROM,
Address information (time information) is recorded in the data. Further, in recording type optical disks such as CD-R and CD-RW, address information (time information) is ATIP (Absolub).
te Time In Pregroove) Information is recorded. Therefore, the position of the pickup 11 can be easily detected by using the address information as the position information of the pickup 11. The total recording time of the optical disc differs depending on the type of the disc. Therefore, when the address information of the optical disc is used as the position information of the pickup 11, when the optical disc D is set in the optical disc device 11, the load value of the pickup 11 is detected while reading the address information of the optical disc D. good.

Further, when the optical disk D is reproduced a plurality of times by using the repeat function of the optical disk device 1 or the like, or when verifying or the like is performed after data recording, the following is preferable. That is, it is preferable to detect a place where the magnitude of the load when moving the pickup 11 is equal to or greater than a preset threshold value and update the stored content of the large load position storage memory 19. By doing so, it is possible to deal with the case where the magnitude of the load for moving the pickup 11 of the optical disk device changes due to changes in the ambient temperature, etc. The value of the load for each position when the pickup 11 is moved or the value corresponding thereto may be updated only when the value changes.

Next, the operation of the optical disc apparatus according to the first embodiment of the present invention will be described using a flow chart. FIG. 2 is a flow chart for explaining an example of the operation of the optical disc device according to the first embodiment of the present invention.

First, the user sets an optical disc in the optical disc device 1 in order to reproduce or record data on the optical disc D. Feed drive signal calculation circuit 2
When the optical disc D is set in the optical disc device 1, the position information of 0 is read from the memory 19 for storing a large load position, where the magnitude of the load is equal to or more than a preset predetermined value (s1). Subsequently, the system control unit 21 starts reproducing or recording data on the optical disc D. At this time,
The RF signal output from the optical pickup 11 is decoded into time information (address information) by the address information generation circuit 17, and the pickup 11 is stored in the current position storage memory 18.
Are sequentially stored and updated as the current position (detected position) information of (s2).

The tracking drive signal output from the pickup 11 is output to the feed drive signal calculation circuit 20 via the TE signal generation circuit 14 and the control signal generation circuit 15. Then, the feed drive signal calculation circuit 20 calculates an appropriate position of the pickup 10 and outputs a signal. The feed motor drive circuit 13 controls the feed motor 12 based on this signal to move the pickup 10 to an appropriate position. In this way, feedback control is always performed by the servo mechanism while the optical disk device 1 is reproducing or recording data.

When data reproduction or recording is started on the optical disc D, the feed drive signal arithmetic circuit 20
Pickup 1 stored in the current position storage memory 18
It is confirmed / determined whether or not the current position information of 1 corresponds to the position information read from the large load position storage memory 19 (s3). When the information on the current position of the pickup 11 does not correspond to the position information stored in the large load position storage memory 19, a drive signal is output to the feed motor drive circuit 13 so that the feed motor 12 has a predetermined drive force (normally). The driving force of the pickup 11) moves the pickup 11 (s4). On the other hand, when the current position of the pickup 11 corresponds to the position information stored in the memory 17, the feed drive signal calculation circuit 20 outputs a signal to the feed motor drive circuit 13 so that the feed motor 12 has a predetermined drive force. The pickup 11 is moved with a larger driving force than that (s5).

At this time, the feed drive signal arithmetic circuit 20
Detects a control signal generated from the TE signal output from the pickup 11 and updates the information of the position where the load magnitude is larger than the threshold value based on the control signal (s
6). That is, the control signal generated from the TE signal output from the pickup 11 determines whether the driving force for moving the pickup 11 in s4 or s5 is appropriate. For example, when the pickup 11 is driven with a driving force larger than a predetermined driving force and the TE signal value is larger than the threshold value, it can be understood that there is no problem even if the pickup 11 is driven with a normal driving force. Therefore, the information on the magnitude of the load at this position is updated, and when the pickup 11 moves again on this position, the pickup 11 is moved by the normal driving force.

Subsequently, the system control unit 21 determines whether or not the data reproducing or recording process is completed (s).
7). If the data reproduction or recording process is not completed, s
The processing from 3 to s7 is repeated. On the other hand, when the data reproduction or recording process is completed, the feed drive signal arithmetic circuit 20 stores the position information in which the magnitude of the held / updated load is equal to or larger than a predetermined value set in advance, as a memory for storing a large load position. It is stored in 19 (s8). Then, all the processes are finished.

Further, instead of s1 in the above flow chart, as shown in FIG. 3, when recording / reproducing data to / from the optical disk, the pickup 10 is moved to first set the load. You may ask for data. Figure 3
6 is a flowchart for explaining an example of a process of detecting load data in the optical disc device according to the first embodiment of the present invention. First, when the optical disc D is set in the optical disc device 1, the system control unit 21 causes the optical pickup 31 of the pickup 11 to irradiate the set optical disc D with laser light. At the same time, a drive signal is output from the feed motor drive circuit 13 to the feed motor 12 to control the pickup 11 to move within the movable range of the pickup 11 (s11).

The feed motor 12 moves the pickup 11 with a normal driving force over the entire movable range. Further, the pickup 11 receives the reflected light from the optical disc D and outputs a received light signal (s12). The address information generation circuit 17 detects the address information of the optical disc D,
The current position information of the pickup 11 is sequentially output to the current position storage memory 18. The address information generation circuit 17 also stores and updates the current position (detected position) information of the pickup 11 in the current position storage memory 18.

The pickup 11 outputs a tracking signal, and this signal is input to the TE signal generation circuit 14. When this signal is input, the control signal generation circuit 15 performs phase compensation and gain adjustment, and outputs the signal to the feed drive signal calculation circuit 20. The feed drive signal calculation circuit 20 includes a preset threshold value, a control signal (feed drive signal) output from the control signal generation circuit 15,
To compare. Then, the position information when the feed drive signal becomes equal to or higher than the threshold value is read from the current position storage memory 18 and stored in the large load position storage memory 19 (s1).
3). This process is performed over the entire movable range of the pickup 11 (s14), and when the load data of the entire movable range of the pickup 11 is acquired, the system control unit 21 ends the process.

When carrying out the steps shown in FIG.
It is not necessary to perform step s8 of the flowchart shown in FIG.

In the above description, the position where the load magnitude when moving the pickup 11 of the optical disc apparatus 1 is a predetermined value or more is stored in the large load position storage memory 19 in advance. In the device 1, the position information over the entire movable range when the pickup 11 is moved and the magnitude of the load at that position are associated and stored in the memory, and the pickup force is adjusted by the driving force according to the magnitude of the load. 11 may be moved. In this case, as shown in FIG.
Instead of, the load-position storage memory 23 may be provided.

The load-position storage memory 23 is a memory for storing the load magnitude when moving the pickup 11 and the position information in association with each other. The load-position storage memory 23 can store, together with position information over the entire movable range when the pickup 11 is moved, the magnitude of the load at that position in association with each other.

The optical disc apparatus 1 having such a configuration stores the information stored in the load-position storage memory 23 and the current position information of the pickup 11 when recording or reproducing data on the optical disc D. In comparison, the feed motor 12 is controlled so as to move the pickup 11 with a driving force according to the current position of the pickup 11. As a result, it becomes possible to move the pickup 11 with a driving force according to the magnitude of the load at the current position of the pickup 11, and it is possible to further suppress power consumption as compared with the first embodiment.

Next, the operation of the optical disc apparatus 1 having the load-position storage memory 23 will be described with reference to a flow chart. FIG. 4 is a flowchart for explaining another example of the operation of the optical disc device according to the first embodiment of the present invention.

First, the user sets an optical disc in the optical disc device 1 in order to reproduce or record data on the optical disc D. Feed drive signal calculation circuit 2
0 indicates that when the optical disc D is set in the optical disc device 1, the pickup 1 is read from the load-position storage memory 23.
Information about the magnitude of the load corresponding to the detected position when 1 is moved is read (s21). Subsequently, the system control unit 21 starts reproducing or recording data on the optical disc D. At this time, the RF signal output from the optical pickup 11 is decoded into time information (address information) by the address information generation circuit 17, and sequentially stored / updated in the current position storage memory 18 as the current position information of the pickup 11. (S22).

The tracking signal output from the pickup 11 is fed through the TE signal generation circuit 14 and the control signal generation circuit 15 to the feed drive signal operation circuit 20.
Is output to. Then, the feed drive signal arithmetic circuit 20
Calculates the appropriate position of the pickup 10 and outputs a signal. The feed motor drive circuit 13 controls the feed motor 12 based on this signal to pick up the pickup 1
1 moves to the proper position. Thus, the feedback control is always performed by the servo mechanism while the optical disk device 1 is reproducing or recording data.

When data reproduction or recording is started on the optical disc D, the feed drive signal arithmetic circuit 20
Pickup 1 stored in the current position storage memory 18
The current position information of No. 1 and the position information stored in the load-position storage memory 23 are compared and confirmed (s23).
Then, a drive signal is output to the feed motor drive circuit 13, and the feed motor 12 moves the pickup 11 with a drive force according to the information on the current position of the pickup 11 (s24).

At this time, the feed drive signal arithmetic circuit 20
Detects a control signal generated from the TE signal output from the pickup 11 and updates the information on the magnitude and position of the load based on this control signal (s25). That is,
Based on the control signal generated from the TE signal output from the pickup 11, it is determined whether the driving force for moving the pickup 11 in s24 is appropriate. For example, when the pickup 11 is driven with a predetermined driving force and the TE signal value is larger than the threshold value, it is better to drive with a driving force larger than the normal driving force. Therefore, the load information at this position is updated, and when the pickup 11 moves again on this position, the pickup 11 is moved with a driving force larger than the normal driving force.

Subsequently, the system control unit 21 determines whether or not the data reproducing or recording process is completed (s2).
6). Then, the processing from s23 to s26 is repeated until the data reproducing or recording processing is completed. Also,
When the data reproduction or recording process is completed, the feed drive signal calculation circuit 20 stores the information on the magnitude and position of the held / updated load in the load-position storage memory 23 (s27). Then, all the processes are completed.

[Second Embodiment] Next, an optical disk device according to a second embodiment of the present invention will be described. Figure 5
FIG. 6 is a block diagram of an optical disc device according to a second embodiment of the present invention. As shown in FIG. 5, the optical disc device 2 is
This is a configuration in which the address information generating circuit 17 of the optical disk device 1 shown in FIG. 1 is replaced with an encoder 22 which is a position information detecting means. Therefore, the same parts as those of the optical disk device 1 are designated by the same reference numerals and detailed description thereof will be omitted.

The encoder 22 is a sensor that converts the position information and the angle information of the feed motor 12 into an electric digital amount, and is used to detect the position information of the pickup 11. When a stepping motor or a DC motor is used as the feed motor, it is preferable to use a rotary encoder that converts angle information into an electric digital amount. When a linear motor is used as the feed motor, a linear encoder that converts linear position information into an electric digital amount may be used.

In the optical disc device 2, the position of the pickup 11 is detected by using the encoder 22. By doing so, the optical disc D can be used like the optical disc device 1.
It is possible to detect the magnitude of the load at the current position of the pickup 11 without setting. In addition,
When a stepping motor is used as the feed motor 12, the feed motor (stepping motor) 1 is fed from the feed motor drive circuit 13 without using the encoder 22.
The current position of the pickup 11 may be detected by counting the number of pulses output to 2. As a result, the configuration of the optical disc device 2 can be simplified.

The optical disk device 2 having the above-mentioned configuration is
The position information of the pickup 11 is detected from the position information and the angle information of the feed motor 12 output from the encoder 22. Further, similarly to the optical disc device 1, the optical disc device 2 has a load value when the feed motor 12 moves the possible range of the pickup 11, and the load value is a predetermined value (threshold value).
The above positions are stored in the large load position storage memory 19. Then, when tracing a position other than the position stored in the large load position storage memory 19, the pickup 11 is picked up by the feed motor 12 with a normal driving force that allows the pickup 11 to move smoothly even if the load value is less than a predetermined value. To move.

Further, when the position stored in the large load position storing memory 19 is traced again, a driving force larger than the normal driving force with which the pickup 11 can smoothly move even if the load value is equal to or greater than a predetermined value. Then, the pickup 11 is moved to the feed motor 12. As a result, when the load value is smaller than the threshold value, the feed motor 1
The driving force of 2 can be reduced. Therefore, by changing the driving force of the feed motor 12 according to the magnitude of the load, it is possible to suppress unnecessary power consumption.

The operation of the optical disk device according to the second embodiment of the present invention is the same as that of the first embodiment, and will be omitted.
Further, in the optical disc device 2, similarly to the optical disc device 1, a load-position storage memory 23 may be provided instead of the large load position storage memory 19. At this time, the same effect as that of the optical disk device 1 can be obtained.

[0072]

The present invention has the following effects.

(1) In the optical disk device, when the pickup means is moved, when it comes to a position with a large load, feed-forward control is performed to increase the driving force immediately before it, so that the conventional driving force is always large. It is not necessary to drive it, and power consumption can be suppressed. Also,
It is possible to ease the load variation specifications of the optical disk device.

(2) Since the optical disk device performs feed forward control for changing the driving force immediately before the position where the magnitude of the load fluctuates when the pickup means is moved, the optical disc device responds to the position. The pickup means can be moved with an appropriate driving force, and power consumption can be suppressed. In addition, it is possible to ease the load variation specification of the optical disk device.

(3) Since the load detecting means uses the tracking drive signal indicating the tracking state output by the pickup means when the optical beam is irradiated onto the optical disc, as a value representing the magnitude of the load, the load detecting means It is not necessary to provide a mechanism for detecting the size of the.

(4) Since the position information in which the load is equal to or greater than the predetermined value is updated based on the detection values of the load detection means and the position detection means when the pickup means is actually moved, the optical disk is repeatedly read. Even if the size of the load changes due to a temperature change or the like by reproducing, it is possible to cope with the change.

(5) The value representing the magnitude of the load at each position of the pickup means stored in the storage means is based on the detection values of the load detection means and the position detection means when the pickup means actually moves, Since the load information is updated, even if the load value changes due to a temperature change or the like by repeatedly playing the optical disc, the change can be dealt with.

(6) Since the address information recorded on the optical disc is used as the position information of the pickup means, it is possible to store the address information in the storage means without providing a mechanism for detecting the position information separately. The address information can be easily detected without updating.

(7) Since the drive signal of the driving means or the output signal of the position information detecting means is used as the position information of the pickup means, the position information of the pickup means can be surely detected.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a flow chart for explaining an example of the operation of the optical disc device according to the first embodiment of the present invention.

FIG. 3 is a flowchart for explaining an example of a process of detecting load data in the optical disc device according to the first embodiment of the present invention.

FIG. 4 is a flowchart for explaining an example of another operation of the optical disc device according to the first embodiment of the present invention.

FIG. 5 is a block diagram of an optical disc device according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram showing an outline of a feed mechanism of an optical pickup.

[Explanation of symbols]

1, 2: optical disk device 9, 102, 103, 112, 113: axis 11: Pickup 12, 105: Feed motor 13: Feed motor drive circuit 17: Address information generation circuit 18: Memory for storing current position 19: Memory for storing large load position 20: Feed drive signal arithmetic circuit 23: Load-position storage memory

Claims (11)

[Claims] 1. A pickup means for irradiating a light beam to the optical disc, facing a recording surface of the optical disc, a driving means for moving the pickup means within a movable range of the optical disc in a radial direction, and a position of the pickup means. Position detection means for sequentially detecting the position of the pickup means, and a storage means for storing position information of the pickup means such that a load at each position when the drive means moves the pickup means is a predetermined magnitude or more, With a predetermined driving force other than the position stored by the means,
An optical disk device comprising: a control unit that controls the driving unit to move the pickup unit with a driving force larger than the predetermined driving force at a position stored by the storage unit. . 2. A pickup means for irradiating the optical disk with a light beam facing the recording surface of the optical disc, a drive means for moving the pickup means within a movable range of the optical disc in the radial direction, and a position of the pickup means. Position detection means for sequentially detecting the load, storage means for storing the magnitude of the load at each position when the drive means moves the pickup means, and the position detection means for sequentially detecting the position of the pickup means. At the same time, a control means for reading the magnitude of the load at the detection position of the pickup means from the storage means and controlling the drive means so as to move the pickup means with a driving force corresponding to the magnitude of the load. An optical disk device comprising: 3. A load detecting means for detecting the magnitude of the load at each position when the driving means moves the pickup means, wherein the pickup means performs tracking when the optical beam is irradiated onto the optical disc. The optical disc device according to claim 1 or 2, wherein the load detection means outputs the tracking drive signal indicating the state, and the load detection means uses the tracking drive signal as a value for detecting the magnitude of the load. 4. The load detection means for detecting the magnitude of the load at each position when the drive means moves the pickup means, and the control means has the magnitude of the load detected by the load detection means. 2. The optical disk device according to claim 1, wherein the position detected by the position detecting unit when the value of is greater than or equal to a predetermined value is stored in the storage unit in advance. 5. The load detection means detects the magnitude of the load at each position when the drive means moves the pickup means, and the control means has a magnitude of the load detected by the load detection means. 3. The optical disk device according to claim 2, wherein the position detected by the position detecting unit under the load is associated with the position, and is stored in the storage unit in advance. 6. The control means updates the position information stored in the storage means based on detection values of the load detection means and the position detection means when the pickup means actually moves. The optical disk device according to claim 4, which is characterized in that. 7. The control means controls the load magnitude stored in the storage means at each position of the pickup means to be one of the load detection means and the position detection means when the pickup means actually moves. The optical disk device according to claim 5, wherein the update is performed based on the detected value. 8. The optical disc apparatus according to claim 1, wherein the storage unit stores address information recorded on the optical disc as position information of the pickup unit. 9. The storage device according to claim 1, wherein the storage device stores the drive signal of the drive device or the output signal of the position information detection device as the position information of the pickup device. Optical disk device. 10. A position at which a pickup means for irradiating a light beam is made to face a recording surface of an optical disk to move substantially the entire movable range thereof, and the magnitude of the load detected during the movement becomes a predetermined value or more. Is detected, and the detected position information is stored in advance, and when the pickup means is moved, a predetermined driving force is applied at a position other than the stored position, and at the stored position, the predetermined driving force is applied. Also, the pickup movement control method is characterized in that the pickup means is controlled to move with a large driving force. 11. A pickup means for irradiating a light beam is opposed to a recording surface of an optical disk to move substantially the entire movable range thereof, and the magnitude of the load detected during the movement is stored for each detected position. Incidentally, when the pickup means is moved, the position of the pickup means is sequentially detected, and the magnitude of the load at the detection position of the pickup means is read from the stored information to determine the magnitude of the load. A pickup movement control method, characterized in that the pickup means is controlled to move by a driving force according to the above.