JPH0954962A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a seeking high-speed by executing a macro seeking after positioning an objective lens at a reference position with respect to an optical head at the time of the macro seeking to facilitate the pulling in of a tracking servo. SOLUTION: A tracking servo(TS) 10 executes the macro seeking by relatively moving the objective lens to an optical head 4 while driving a tracking coil according to the tracking error signal from a signal detecting and shaping circuit 6. When a data readout command is sent from a host, a controller 13 calculates the number of jump tracks from a present address and a target address and when the tracks are >=200tracks, the controller judges the seeking to be the macro seeking. Then, the controller calculates the present position of the objective lens with respect to the optical head 4 from the voltage impressed on the tracking coil to position the objective lens to the reference position via the TS 10 and, thereafter, executes the macro seeking by moving the optical head 4 to the radial direction via a thread servo 11 and a thread motor 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device, and more particularly to a disk device for recording / reproducing information using an optical head.

[0002]

2. Description of the Related Art In an optical reproducing apparatus such as a CD-ROM, when a so-called seek operation is performed in which an optical head is moved to read information at a target position on a medium, two operations are mainly performed. ing. These two operations are the so-called macro seek operation that moves the optical head itself to the target position to perform rough positioning, and the movement of the lens mounted on the optical head that irradiates the medium with laser light for reading information. This is a so-called micro-seek operation for performing highly accurate positioning.

FIG. 5 shows a block diagram of a conventional example. The conventional disc device 21 is arranged so as to face a spindle motor 23 that rotates an optical disc 22, an information recording surface of the optical disc 22, and an optical head 24 that irradiates the optical disc 22 with a laser beam L to read information.
A signal for detecting the focus error signal FE, the tracking error signal TE, and the spindle error signal SE from the signals read by the sled motor 25 for moving 4 in the radial direction of the optical disk 22 and the optical head 24, and for shaping the waveform of the read signal. A detection shaping circuit 26, a signal processing unit 27 that processes the signal detected and shaped by the signal detection and shaping circuit 26 to restore recorded data, and a subcode that detects a subcode from the signal detected and shaped by the signal detection and shaping circuit 26. The focus error signal FE detected by the detection circuit 28 and the signal detection / shaping circuit 26 is supplied, and the focus servo circuit 29 and the signal detection / shaping circuit 26 that control the focusing of the laser light L radiated to the disk according to the focus error signal FE. The tracking error signal TE detected in The tracking error signal TE detected by the tracking servo circuit 30 and the signal detection shaping circuit 26 for performing the tracking servo control of the laser light L applied to the disk according to the tracking error signal TE is supplied, and the optical signal is supplied according to the tracking error signal TE. The spindle error signal SE detected by the sled servo circuit 31 for controlling the position of the head and the signal detection and shaping circuit 26 is supplied, and the spindle motor 23 is controlled so as to keep the rotation of the disk 22 constant according to the spindle error signal SE. A spindle servo circuit 32, a focus servo circuit 29, a tracking servo circuit 30, a thread servo circuit 31, and a controller 33 for controlling the spindle servo circuit 32 based on an instruction from the host side.

FIG. 6 is a block diagram showing an example of a wire supporting type optical head. The optical head 24 includes a base 40, an objective lens 41 that focuses the laser light L on the disc 22, a holder 42 that holds the objective lens 41 in the disc 22 direction, and a radial direction of the disc 22, and a holder 42. Focusing control drive mechanism 43 for moving the disk 22 in the surface direction to perform focusing control, holder 42
By moving the objective lens 41 to the disk 22.
The tracking control drive mechanism 44 is configured to move in the radial direction to perform tracking control. The holder 42 is held on the base 40 via a wire 45 and an elastic material 46 so as to be movable in the directions of arrows A and B. The focusing control drive mechanism 43 includes a focus coil 47 fixed to the holder 42 and a focus coil 47.
Magnet 4 provided on the base 40 so as to be inserted into
8. A focus servo signal is supplied from the focus servo circuit 29 to the focus coil 47. The focus coil 47 generates a magnetic field according to the focus servo signal, and interacts with the magnetic field of the magnet 48 inserted in the focus coil 47 to move the holder 42 in the arrow A direction.

The tracking control drive mechanism 44 comprises a tracking coil 49 fixed to the holder 42 and a magnet 50 provided on the base 40 so as to face the tracking coil 49. The tracking coil 49 is connected to the tracking servo circuit 30, a tracking servo signal is supplied from the tracking servo circuit 30, a magnetic field corresponding to the tracking servo signal is generated, and a magnet 50 provided facing the tracking coil 49 is provided. The holder 42 is moved in the direction of arrow B by interacting with the magnetic field.

The base 40 is connected to the sled motor 25, and is moved in the direction of arrow B by the sled motor 25. The thread motor 25 is
It is connected to the sled servo circuit 31 and is driven according to a sled servo signal supplied from the sled servo circuit 31. Further, the spindle motor 25 is connected to the spindle servo circuit 32, and is controlled so that the disk 22 rotates at a constant linear velocity according to the spindle servo signal supplied from the spindle servo circuit 32.

When performing the seek operation, the subcode on the disk 22 is read and the signals to the sled motor 25 and the tracking coil 49 are controlled according to the read subcode. FIG. 7 shows a flowchart of a conventional seek operation. When the seek operation start instruction is input from the host together with the target address, the controller 33 first reads the current address from the subcode currently read by the optical head 24. (Step S4-1).

Next, the controller 33 determines the target address read at the start of the seek operation and the step S4-1.
The number of tracks to which the laser light L should jump is calculated from the current address read in (step S4-2). Here, the controller 33 executes step S4-2.
It is determined whether the number of tracks to be jumped calculated in step 200 is 200 tracks or more (step S4-3).

If the controller 33 determines in step S4-3 that the number of tracks to jump to is 200 or more, it executes the macro seek operation, and if it determines that the number of tracks is less than 200, Performs a micro seek operation. First, the macro seek operation will be described. In the macro seek operation, the controller 33 first controls the tracking servo circuit 30 to release the tracking servo, activates the sled motor 25, and calculates the wait time according to the number of tracks calculated in step S4-2. , The sled motor 25 is driven for the calculated wait time and stopped (step S
4-5 to S4-8).

After the sled motor 25 is stopped, the released tracking servo is turned on again, and the current address is read from the subcode when the servo is applied.
It is determined whether the address is the target address (steps S4-9 to S).
4-12). If the current address matches the target address in step S4-12, the seek operation is completed, and if they do not match, the process returns to step S4-2 and the seek operation is executed again.

Next, the micro seek operation will be described. In the micro seek operation, the controller 33 first controls the tracking servo circuit 30 to release the tracking servo, and then the tracking servo circuit 30.
The tracking coil 49 is driven to accelerate the objective lens 41 in the target address direction (step S4-1).
3, S4-14).

After accelerating the objective lens 41, the controller 33 recognizes the number of tracks jumped by counting the tracking error signal, and the step S4
The tracking servo circuit 30 is controlled when the number of jump tracks calculated in step 2 is approximated to decelerate the movement of the objective lens 41, and when the movement of the objective lens 41 decreases to a designated speed, the tracking servo circuit 30
To drive the tracking servo (step S4
-15-S4-19).

When the tracking servo is applied, it is judged whether or not the current address is read from the subcode and matches the target address. If the current address matches the target address, it is considered that the seek operation has been completed, and the match must be made. For example, the process returns to step S4-2 and the macro seek operation or the micro seek operation is executed again (steps S4-11, S4-12).

As described above, in the conventional seek operation, if the number of jump tracks is large, the macro seek operation is executed, and if it is small, the micro seek operation is executed, and one seek operation is performed. At times, one macro seek operation and several micro seek operations were usually performed.

[0015]

However, in the conventional disk device, after the seek operation is completed, the objective lens is deviated from the center to some extent by the above-described micro seek operation. Here, if the seek operation is performed only once, the objective lens is positioned substantially at the center by the sled servo acting in addition to the tracking servo in the subsequent reproducing operation. However, when the seek operation is continuous, it takes a certain amount of time for the sled servo to work. Therefore, the sled servo is not operated for each seek operation. Therefore, when the seek operation is continuous, the deviation amount from the center of the objective lens may cumulatively increase depending on the seek direction of the micro seek operation. As described above, when the macro seek operation is performed in the seek operation shown in FIG. 7, the tracking servo is released and the seek operation is performed, so that the holder having the objective lens is largely displaced as described above. Since it is elastically held with respect to the base, the holder vibrates freely, and when the tracking servo is turned on to read the current address after the macro seek operation ends, it becomes difficult to pull in the servo, It was preventing the seek operation from speeding up.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a disk device in which the seek operation is speeded up by facilitating the pulling-in of the tracking servo at the end of the seek operation. To do.

[0017]

According to a first aspect of the present invention, an objective lens for converging light on a disc, a carriage for movably holding the objective lens, and the objective lens with respect to the carriage. In a disk device having an objective lens moving means for moving and a carriage moving means for moving the carriage in a radial direction of the disk, a position detecting means for detecting a position of the objective lens with respect to the carriage, and a carriage moving means. When the carriage is moved, before the carriage moving means is driven, with respect to the carriage after the carriage is moved by the carriage moving means according to the position of the objective lens with respect to the carriage detected by the position detecting means. The pair is adjusted so that the position of the objective lens becomes a reference position. Characterized in that it has a control means for controlling the movement of the objective lens by the lens moving means.

According to the first aspect, the position of the objective lens is detected before the carriage is moved, and the objective lens is controlled so as to be stable at the reference position after the carriage is moved according to the deviation of the objective lens from the reference position. Therefore, the position of the objective lens after the movement of the carriage can be stabilized at the reference position, and the position of the objective lens with respect to the carriage after the movement of the carriage can be adjusted even if the objective lens is on the inner peripheral side of the disc.
It can be positioned at the reference position where it can be moved freely even on the outer peripheral side, and the micro seek operation and tracking operation by the objective lens after the carriage movement can be reliably performed.

According to a second aspect, the objective lens moving means is
A driving coil, and by supplying a driving signal to the driving coil, a magnetic field is caused to interact between the objective lens and the carriage, and the objective lens is moved with respect to the carriage, The position detection means is
The position of the objective lens with respect to the carriage is detected according to the voltage generated in the drive coil.

According to the second aspect, the position of the objective lens with respect to the carriage is detected by detecting the voltage generated in the drive coil used in the objective lens moving means for moving the objective lens with respect to the carriage. Therefore, it is not necessary to separately provide a sensor or the like for detecting the position of the objective lens, and the position of the objective lens can be controlled without increasing the weight of the carriage.
It can be realized at low cost.

[0021]

1 is a block diagram of an embodiment of the present invention. The disk device 1 of the present embodiment is arranged so as to face a spindle motor 3 for rotating an optical disk 2, an information recording surface of the optical disk 2, and an optical head 4 for irradiating the optical disk 2 with laser light L to read information. A signal for shaping the read signal while detecting the focus error signal FE, the tracking error signal TE, and the spindle error signal SE from the signals read by the sled motor 5 for moving the optical disc 2 in the radial direction of the optical disc 2 and the optical head 4. A detection shaping circuit 6, a signal processing unit 7 which processes a signal detected and shaped by the signal detection and shaping circuit 6 to restore recorded data, and a subcode which detects a subcode from the signal detected and shaped by the signal detection and shaping circuit 6. The focus error signal FE detected by the detection circuit 8 and the signal detection and shaping circuit 6 is supplied to the focus error signal FE. A focus servo circuit 9 for controlling focusing of laser light applied to the disc according to the signal FE, and a tracking error signal TE detected by the signal detection shaping circuit 6 are supplied, and a laser applied to the disc according to the tracking error signal TE. A tracking servo circuit 10 for performing tracking servo control of light, a tracking error signal TE detected by a signal detection and shaping circuit 6 are supplied, and a sled servo circuit 11 for controlling the position of an optical head according to the tracking error signal TE, signal detection The spindle error signal SE detected by the shaping circuit 6 is supplied, and the spindle servo circuit 1 that controls the spindle motor 3 to keep the rotation of the disk constant according to the spindle error signal SE.
2. A voltage applied to the optical head 4 from the controller 13 that controls the focus servo circuit 9, the tracking servo circuit 10, the thread servo circuit 11, the spindle servo circuit 12, and the tracking servo circuit 10 based on an instruction from the host side is detected. Coil voltage detector 1
4. An analog / digital (A / D) converter 15 which converts the analog voltage detected by the coil applied voltage detector 14 into digital data and supplies the digital data to the controller 13.

The optical head 4 has the same structure as that shown in FIG. 6, and has a base 40, an objective lens 41 for converging the laser light L on the disk 2, and an objective lens 41 close to the surface of the disk 2. , A separation direction (arrow A direction), and a holder 42 that movably holds the disk 2 in the radial direction (arrow B direction), and the holder 42 is moved in the surface direction of the disk 2 (arrow A direction) for focusing control. A focusing control drive mechanism 43 for performing the movement and a tracking control drive mechanism 44 for performing tracking control by moving the holder 42 in the radial direction of the disc 2 (direction of arrow B) by moving the holder 42. Holder 42
Is a wire 45 so that it can move in the directions of arrows A and B.
It is held on the base 40 via the elastic member 46.
The focusing control drive mechanism 43 includes a focus coil 47 fixed to the holder 42, and a magnet 4 provided on the base 40 so as to face the focus coil 47.
8. A focus servo signal is supplied from the focus servo circuit 9 to the focus coil 47. The focus coil 47 generates a magnetic field according to the focus servo signal and interacts with the magnetic field of the magnet 48 provided by being inserted into the focus coil 47 to move the holder 42 in the arrow A direction.

The tracking control drive mechanism 44 comprises a tracking coil 49 fixed to the holder 42 and a magnet 50 provided on the base 40 so as to face the tracking coil 49. The tracking coil 49 is connected to the tracking servo circuit 10, receives a tracking servo signal from the tracking servo circuit 10, generates a magnetic field according to the tracking servo signal, and a magnet 50 provided to face the tracking coil 49. The holder 42 is moved in the direction of arrow B by interacting with the magnetic field.

The base 40 is connected to the sled motor 5 and is moved in the direction of arrow B by the sled motor 5. The sled motor 5 is connected to the sled servo circuit 11 and is driven according to a sled servo signal supplied from the sled servo circuit 11. Further, the spindle motor 3 is connected to the spindle servo circuit 12, and so-called C, so that the disk 2 rotates at a constant linear velocity according to the spindle servo signal supplied from the spindle servo circuit 12.
LV (Constant Linear Velocity) control is performed.

When performing the seek operation, the subcode on the disk 2 is read, and the sled motor 5 and the tracking coil 49 described above are read according to the read subcode.
Was controlling the signal to. 2 to 4 are flowcharts showing the operation of essential parts of one embodiment of the present invention. FIG. 2 is an operation flowchart of actuator sensitivity measurement processing, and FIG.
Is an operation flowchart of the seek processing, and FIG. 4 is an operation flowchart of the lens static vibration jump processing. The actuator sensitivity measurement process is executed, for example, when the disk device 1 is powered on, and the actuator sensitivity obtained by the actuator sensitivity measurement process is stored in the RAM or the like provided inside the controller 13. Controller 13
Performs seek processing operation, which will be described later, using the actuator sensitivity obtained in the actuator sensitivity measurement processing during seek processing. The lens static vibration jump processing is executed as part of the seek processing operation as described later.

First, the actuator sensitivity measuring process will be described. The actuator sensitivity measurement processing is executed together with other startup processing when the disk device 1 is powered on.
When executing the actuator sensitivity measurement processing, as shown in FIG. 2, the controller 13 first instructs the tracking servo circuit 10 to stop the tracking servo operation, and stops the tracking servo operation (step S1-1).

After the tracking servo is stopped in step S1-1, the tracking servo is stopped, that is, the tracking servo circuit 10 to the tracking coil 4 when the objective lens 41 is at the reference position.
The reference voltage Vref applied to 9 is measured by the coil applied voltage detector 14, converted into digital data by the A / D converter 15, and stored in the RAM provided inside the controller 13 (step S1-2). ). When the measurement of the reference voltage Vref is finished, the controller 13 controls the tracking servo circuit 10 to turn on the tracking servo, and measures the voltage V1 during tracking servo (steps S1-3, S1-4, S1−). 5).

Next, the controller 13 controls the tracking servo circuit 10 so that the base 17 is fixed and the objective lens 41 is moved by the tracking coil 49 to execute a micro-jump for 50 tracks. The voltage V2 applied to the coil 49 is measured (steps S1-6 and S1-7). Next, the controller 13 calculates the actuator sensitivity constant Vact (step S1-8).

In step S1-8, the actuator sensitivity constant Vact is the voltage V1 measured in step S1-2.
And the voltage difference (V1-V2) from the voltage V2 measured in step S1-7. The actuator sensitivity constant Vact obtained by the above is the controller 13
It is stored in the RAM provided inside. From the above,
The measurement of the actuator sensitivity ends.

Next, the seek operation will be described. When the controller 13 receives a data read command from the host, the controller 13 moves the laser beam L to a position where the data required by the host is recorded, and executes a seek operation for reading the data. The seek operation is executed by the procedure shown in FIG.

When the seek operation start instruction is input from the host together with the target address in step S2-1, the controller 13 first reads the current address from the subcode currently read by the optical head 4. Next, the controller 13 calculates the target address read at the start of the seek operation, the current address designated by the host in step S2-1, and the number of tracks to which the laser beam L should jump to reach the target address ( Step S
2-2). Here, the controller 13 performs step S2.
It is determined whether or not the number of tracks to be jumped calculated in Step 2-2 is 200 tracks or more (Step S2-3).

If the controller 13 determines in step S2-3 that the number of tracks to jump to is 200 or more, it executes the macro seek operation, and if it determines that the number of tracks is less than 200, Performs a micro seek operation. First, the macro seek operation will be described. In the macro seek operation, the controller 13 first executes a lens static vibration jump process that statically shakes the objective lens 41 at the reference position.

Here, the lens static vibration jump processing will be described. FIG. 4 shows an operation flowchart of the lens static vibration jump processing. In the lens static shake jump process, first,
The voltage Vd currently applied to the tracking coil 49
c is measured (step S3-1). Next, step S
The voltage measured in 3-1 is divided (step S3-2).

By dividing the measured voltage Vdc by the actuator sensitivity constant Vact, it is possible to convert the measured voltage Vdc into a value corresponding to the sensitivity of the actuator (tracking control drive mechanism 44) when the disk device 1 is used. It is possible to perform the lens static vibration jump processing according to the state.

Next, it is determined whether or not the divided value V0 (= Vdc / Vact) calculated in step S3-2 is larger than a preset specified value (step S3-3). When the divided value V0 is larger than the specified value in step S3-3, the displacement of the objective lens 41 from the reference position is extremely large. Therefore, a process of returning the objective lens to the reference position is performed. If the divided value V0 is within the specified value in step S3-3, it can be considered that the objective lens 41 is positioned at the reference position, and the lens static vibration jump process is terminated as it is.

If it is determined in step S3-3 that the divided value V0 is greater than the specified value, then the voltage Vdc measured in step S3-1 is measured by the actuator sensitivity measurement process shown in FIG. It is determined whether or not the voltage at the reference position is higher than the reference voltage Vref (step S3-4). If the voltage Vdc is larger than the reference voltage Vref in step S3-4, for example, the disk 2
Since it can be considered that the objective lens is displaced in the outer peripheral direction of, the jump direction is set to the inner peripheral side (step S3-5). If the voltage Vdc is smaller than the reference voltage Vref in step S3-4, on the contrary, it can be considered that the objective lens is displaced in the inner peripheral direction of the disk 2, and therefore the jump direction is set to the outer peripheral side (step S3). -6).

When the jump direction is set in steps S3-5 and S3-6, the number of tracks of the static vibration jump is calculated according to the voltage Vdc measured in step S3-1 (step S3-7). ). Next, in the jump direction set in steps S3-5 and S3-6, step S
The micro seek operation for the number V'of jumps set in 3-7 is performed (step S3-8). After the jump operation is completed, a lens static vibration jump execution flag indicating that the lens static vibration jump is executed is set inside the controller 13, and the lens static vibration jump processing is terminated (step S3-9).

From the above, the base 40 in the optical head 4 is
The deviation of the objective lens 41 with respect to
1 can be set as the reference position. Here, returning to FIG. 3, the description will be continued. When the lens static shake jump processing is executed in step S2-4, the lens static shake jump execution flag is set by referring to the lens static shake jump execution flag set in step S3-9 of the lens static shake jump processing. Whether or not to execute is determined (step S2-5).

When it is determined in step S2-5 that the lens static shake jump processing has been executed, the address after the lens static shake jump processing is read (step S2-6).
If the address read in step S2-6 is the target address, the seek operation ends, and if it is different from the target address, the process returns to step S2-2 and continues processing (step S2-7). When the macro seek operation is selected again by the processing of steps S2-2 and S2-3, the position of the objective lens has been returned to the reference position by the last lens static vibration jump processing, and thus step S2-4
Then, the lens shake jump process execution flag is not set, and the macro seek operation is performed. In the macro seek operation, next, the tracking servo circuit 10 is controlled to cancel the tracking servo, the sled motor 5 is activated, and the wait time according to the number of tracks calculated in step S2-2 is calculated and calculated. The sled motor 5 is driven for the wait time and stopped (steps S2-8 to S2-12).

After the sled motor 5 is stopped, the released tracking servo is turned on again, the current address is read from the subcode when the servo is applied, and it is determined whether or not it is the target address (steps S2-13 and S2).
-14, S2-6, S2-7). If the current address matches the target address in step S2-7, the seek operation is completed, and if they do not match, the process returns to step S2-2 and the seek operation is executed again.

Next, the micro seek operation will be described. In the micro seek operation, the controller 13 first controls the tracking servo circuit 10 to release the tracking servo, and then the tracking servo circuit 10
The tracking coil is driven via the axis to accelerate the objective lens in the target address direction (steps S2-15 and S2).
-16).

After accelerating the objective lens, the controller 13 recognizes the number of jumped tracks by counting the tracking error signal, and the step S2-2
The tracking servo circuit is controlled at a position close to the number of jump tracks calculated in step S1, and the movement of the objective lens 41 is decelerated. When the movement of the objective lens 41 decreases to a specified speed, the tracking servo circuit is driven to perform the tracking servo. (Steps S2-17 to S2
-20).

When the tracking servo is applied, it is determined whether or not the current address is read from the subcode and matches the target address. If the current address matches the target address, the seek operation is considered to be complete, and the match must be made. For example, returning to step S2-2, the macro seek operation or the micro seek operation is executed again (steps S2-21, S2-6, S2-7).

As described above, according to this embodiment, when the macro seek operation is performed, the objective lens is moved to the optical head 4.
Since the seek operation of moving the optical head 4 is performed after the optical head 4 is positioned at the upper reference position, the movement control considering the position of the objective lens 41 during the macro seek operation becomes possible.
It is possible to suppress the vibration of the objective lens 41 after the macro seek operation is completed, and it is possible to quickly pull in the tracking servo.

Further, the objective lens is positioned at the reference position before the macro seek operation, the amount of movement from the reference position is calculated, and the macro seek operation is performed, so that the error from the target position after the macro seek operation is reduced. The number of micro seek operations after the macro seek operation can be reduced, and thus the seek time can be shortened.

Furthermore, since the number of times of micro seek operation can be reduced, the number of times of displacement of the objective lens 41 is also reduced, and therefore, the decrease in sensitivity of the actuator for displacing the objective lens 41 can be suppressed and stable tracking servo, Also, the focus servo operation can be realized for a long time.

Further, the sensitivity of the actuator that drives the objective lens is measured when the power of the disk device 1 is turned on, and the execution of the lens static oscillation jump is determined according to the sensitivity at that time, and the sensitivity of the actuator that drives the objective lens is determined. Stable operation can be realized even with changes.

In the present embodiment, the wire support system is shown as the optical head, but the optical system is not limited to this, and the objective lens may be a shaft slide system in which an elastic body such as rubber or a magnetic force of a magnet is supported. Good.

[0049]

As described above, according to the first aspect of the present invention, the position of the objective lens is detected before the carriage is moved, and the objective lens is moved after the carriage is moved according to the deviation of the objective lens from the reference position. Since the position of the objective lens is stabilized at the reference position, the position of the objective lens after the movement of the carriage can be stabilized at the reference position. It can be positioned at a reference position where it can be moved freely on either side or on the outer peripheral side, and the micro seek operation and tracking operation by the objective lens after carriage movement can be reliably performed.

According to the second aspect, the position of the objective lens with respect to the carriage is detected by detecting the voltage generated in the drive coil used in the objective lens moving means for moving the objective lens with respect to the carriage. Therefore, it is not necessary to separately provide a sensor or the like for detecting the position of the objective lens, and the position of the objective lens can be controlled without increasing the weight of the carriage.
It has features such as low cost implementation.

[Brief description of drawings]

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

FIG. 2 is an operation flowchart of actuator sensitivity measurement processing according to an embodiment of the present invention.

FIG. 3 is an operation flowchart of a seek operation according to an embodiment of the present invention.

FIG. 4 is an operation flowchart of a lens static vibration jump processing operation according to an embodiment of the present invention.

FIG. 5 is a block diagram of a conventional example.

FIG. 6 is a schematic configuration diagram of an optical head.

FIG. 7 is an operation flowchart of a conventional seek operation.

[Explanation of symbols]

 1 Disk Device 2 Optical Disk 3 Spindle Motor 4 Optical Head 5 Thread Motor 6 Signal Detection Shaping Circuit 7 Signal Processing Section 8 Subcode Detection Circuit 9 Focus Servo Circuit 10 Tracking Servo Circuit 11 Thread Servo Circuit 12 Spindle Servo Circuit 13 Controller 14 Coil Applied Voltage Detector 15 A / D converter

Claims (2)

[Claims] 1. An objective lens for converging light on a disk, a carriage for movably holding the objective lens, an objective lens moving means for moving the objective lens with respect to the carriage, and the carriage. In a disk device having a carriage moving means for moving in the radial direction of the disk, a position detecting means for detecting a position of the objective lens with respect to the carriage, and a carriage moving means for moving the carriage by the carriage moving means. Before driving, the position of the objective lens with respect to the carriage after the carriage is moved by the carriage moving unit is set to a reference position according to the position of the objective lens with respect to the carriage detected by the position detecting unit. And the objective lens by the objective lens moving means. Disk apparatus characterized by comprising control means for controlling the movement of the. 2. The objective lens moving means has a drive coil, and by supplying a drive signal to the drive coil, a magnetic field is caused to interact between the objective lens and the carriage to cause the carriage to move with respect to the carriage. 2. The disk device according to claim 1, wherein the objective lens is moved by a means for moving the objective lens, and the position detecting means detects a position of the objective lens with respect to the carriage according to a voltage generated in the drive coil.