JP2007317314A - Optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the vibration of an objective lens caused by disturbance in an optical disk device. <P>SOLUTION: Movement and displacement of one of first and second objective lenses are detected based on the counter electromotive voltage of an actuator. On the basis of the detection result, an actuator for driving the other objective lens is driven so as to reduce the moving speed or movement and displacement of the other objective lens. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical disc apparatus, and more particularly, to an anti-vibration control technique for an objective lens against shock and vibration disturbances.

  In an optical disc apparatus, laser light is collected by an objective lens, irradiated onto the optical disc as a laser spot, and a signal indicating the deviation of the laser spot with respect to a minute groove on the optical disc recording surface is generated from the reflected laser light. Is fed back to drive the actuator to control the objective lens, thereby controlling the laser spot position. For this reason, when a large vibration or impact exceeding the reference level is applied to the optical disc apparatus from the outside, the above control cannot be followed and a serious failure may occur in the operation of the apparatus.

  Conventional methods for suppressing the movement of the objective lens due to external vibration and improving the vibration resistance performance include a method of arranging an acceleration sensor and a method of detecting the moving speed of the objective lens and controlling it to reduce the speed. . For example, in Japanese Patent Application Laid-Open No. 2003-233911 (Patent Document 1), in an optical storage device or an optical device, in order to be able to safely and reliably retract a lens from an object against an apparatus impact, A technique is described in which the impact acceleration is detected, and when the detected impact acceleration reaches a predetermined value, the actuator is driven with a force larger than the allowable value for a predetermined time, and further driven with a force less than the allowable value. In addition, in Japanese Patent Application Laid-Open No. 2001-67680 (Patent Document 2), in order to stably perform the pull-in operation at the start of focus control and tracking control in an optical disc apparatus even when external vibration occurs, Controls to reduce the speed in each direction by directly detecting the focus direction speed and tracking direction speed of the objective lens caused by external vibration. It has been described as the technology that.

JP 2003-233911 A JP 2001-67680 A

  Among the above-described conventional techniques, the technique using an acceleration sensor adds new parts, resulting in high costs. In addition, it is practically difficult to attach the acceleration sensor to the objective lens body because of space and weight. When the acceleration sensor is attached to a part other than the objective lens body, the detected vibration and the objective lens Since it is different from vibration, a detection error occurs. Further, in the technique of detecting the moving speed of the objective lens and controlling it so as to reduce the speed, the moving speed control effect of the objective lens may not be sufficiently obtained depending on the control state of the objective lens. For example, during the servo control operation in which the objective lens position is controlled by the laser spot position on the disk, it is difficult to sufficiently control the moving speed of the objective lens.

In view of the above-described prior art, the problem of the present invention is that the optical disk apparatus does not use an acceleration sensor or the like, and stabilizes the vibration resistance control of the objective lens even during the servo control operation. It is to be able to do it.
An object of the present invention is to solve such problems and to provide an easy-to-use optical disc apparatus that ensures recording quality and reproduction quality even when a disturbance is applied.

  In order to solve the above-described problems, the present invention detects that the optical disk apparatus has been moved and displaced with respect to one of the first and second objective lenses based on the back electromotive force of the actuator, and the like. Based on the result, the actuator that drives the other objective lens is configured to be driven so as to reduce the moving speed or the moving displacement of the other objective lens.

  According to the present invention, in the optical disc apparatus, even when a disturbance is applied, the vibration of the objective lens can be suppressed, so that deterioration in recording quality and reproduction quality can be suppressed. Moreover, since the configuration does not use an acceleration sensor or the like, an increase in manufacturing cost can be suppressed.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an optical disc apparatus as a first embodiment of the present invention.
In FIG. 1, 101 is an optical disk, 102 is a first objective lens, 103 is a first actuator that drives the first objective lens 102 in a focus direction or a tracking direction, and 104 is a first actuator 103. First driving means, 105 is a second objective lens, 106 is a second actuator that drives the second objective lens 105 in the focus direction or tracking direction, and 107 is a second objective lens 105 that is moved by vibration. This is a first detecting means for detecting the displacement, that is, the moving speed or the moving displacement amount due to the vibration of the second objective lens 105.

  In the configuration of FIG. 1, the first actuator 103 and the second actuator 106 can drive the first objective lens 102 and the second objective lens 105 in at least one of the focus direction and the tracking direction, or both, respectively. It is. When the first actuator 103 drives the first objective lens 102 in the focus direction, the second actuator 106 also drives the second objective lens 105 in the focus direction, and the first actuator 103 causes the first objective 103 to move in the focus direction. When driving the lens 102 in the tracking direction, the second actuator 106 also drives the second objective lens 105 in the tracking direction.

Here, FIG. 5 shows a configuration example of the first detection means 107.
In FIG. 5, 501 is a first resistor, 502 is a second resistor, 503 is a third resistor, 504 is an actuator, 505 is an operating voltage detection means, and 506 is between the actuator 504 and the first resistor 501. A point 507 is a point between the second resistor 502 and the third resistor 503. The actuator 504 is configured by a moving coil, a permanent magnet, or the like, and the driven objective lens is configured to move integrally with the moving coil.
Here, if the resistance value of the actuator 504 is Ra, the resistance value of the first resistor 501 is R1, the resistance value of the second resistor 502 is R2, and the resistance value of the third resistor 503 is R3,
Ra / R1≈R2 / R3 (Expression 1)
It becomes.
When the number 1 is satisfied, the counter electromotive force generated in the actuator 504 can be detected.

When the back electromotive force e is generated, the output voltages of the actuator driver (first driving means) are Vin ₊ and Vin _−, and the potentials at the points 506 and 507 are V1 and V2, respectively.
_{V1 = R1 (Vin + -Vin -} -e) / (R1 + Ra) + Vin - ... ( Equation 2)
_{V2 = R3 (Vin + -Vin -} -e) / (R2 + R3) + Vin - ... ( number 3)
It is expressed. From Equations 1, 2 and 3, the output voltage Vout of the operating voltage detection means 505 is
Vout = V2−V1 = R1 · e / (R1 + Ra) (Equation 4)
By detecting Vout, a value proportional to the back electromotive voltage e can be obtained.

  In FIG. 1, when vibration is applied to the optical disc apparatus, acceleration due to vibration is generated in the first objective lens 102 and the second objective lens 105. At this time, the first detection means 107 detects that the second objective lens 105 has moved and displaced based on the back electromotive voltage of the second actuator. Based on the detection result of the first detection means 107, that is, the output, the first drive means 104 (actuator driver) reduces the movement speed or displacement of the first actuator 103 due to the vibration of the first objective lens 102. That is, the first objective lens 102 is driven so as to suppress vibration. Thereby, the influence of the vibration applied to the optical disc apparatus on the first objective lens 102 is reduced.

  When the first detection means 107 detects that the second objective lens 105 has moved and displaced due to vibration, the first drive means 104 does not always have to drive the first actuator 103, and the second objective A configuration may be adopted in which the lens 105 is driven only when it is detected that the lens 105 has moved in a specific direction at a moving speed or moving displacement that is equal to or greater than a set value. For example, the first actuator 103 may be driven only when the second objective lens 105 moves in a direction approaching the optical disk 101 due to vibration and the moving speed exceeds a range that can be reduced by normal servo control. Good.

  The first objective lens 102 can be driven based on the detection result of the first detection means 107 regardless of the control state of the first objective lens 102. That is, even when the first objective lens 102 generates a laser spot on the optical disk 101, for example, and is servo-controlled by the position error signal of the laser spot, the second objective lens 105 is moved and displaced. The first objective lens 102 is driven by driving the first actuator 103 so as to reduce the moving speed or the moving displacement of the first objective lens 102 based on the detection result. The influence of vibration on the can be reduced. When the vibration of the second objective lens 105 is detected by the first detection means 107, the servo control of the first objective lens 102 is temporarily stopped and the detection result (output) by the first detection means 107 is output. Only control by () may be performed.

It is conceivable that the acceleration generated for the same vibration differs depending on the difference in mass between the first objective lens 102 and the second objective lens 105, the difference in the structure of the actuator, the difference in sensitivity, or the like. When the first driving means 104 drives the first actuator 103 according to the detection result (output), the driving amount for driving the first actuator 103 is set to the second objective lens 102 and the second objective lens 102. It may be determined according to the mass ratio of the objective lens 105 or the mass ratio of the movable part driven by the actuator, the sensitivity, and the like.
The first objective lens 102 and the second objective lens 105 only have to be provided with actuators that can be driven independently, and both objective lenses 102 and 105 may be provided on the same optical head. Alternatively, it may be provided on another optical head.
Further, the structure of the first detection means 107 is not limited to the configuration using the counter electromotive voltage of the second actuator 106. For example, the laser light is condensed on the surface of the optical disc, A configuration may be adopted in which the moving speed or the moving displacement amount due to the vibration of the second objective lens 105 is detected by the positional deviation of the laser spot.

  According to the first embodiment, even when a disturbance such as vibration or impact is applied to the optical disc apparatus, it is possible to suppress the vibration of the objective lens during the recording or reproducing operation. Can be prevented. Moreover, since the configuration does not use an acceleration sensor or the like, an increase in manufacturing cost can be suppressed.

FIG. 2 is a configuration diagram of an optical disc apparatus as a second embodiment of the present invention.
In FIG. 2, 201 is an optical disk, 202 is a first objective lens, 203 is a first actuator that drives the first objective lens 202 in a focus direction or a tracking direction, and 204 is a first actuator 202. First driving means, 205 is a second objective lens, 206 is a second actuator that drives the second objective lens 205 in a focus direction or a tracking direction, and 207 is a second objective lens 205 that is driven by vibration. First detection means for detecting the movement displacement, that is, the movement speed or the movement displacement amount due to the vibration of the second objective lens 205, 208 is a second drive means for driving the second actuator 206, and 209 is a first drive means. That one objective lens 202 is moved and displaced by vibration, that is, the first objective lens 20 A second detecting means for detecting the moving speed or the moving displacement amount of the vibration of the.

  In FIG. 2, when vibration is applied to the optical disc apparatus, acceleration due to vibration is generated in the first objective lens 202 and the second objective lens 205. At this time, the first detection means 207 detects that the second objective lens 205 has been displaced by vibration. Based on the output as the detection result of the first detecting means 207, the first driving means 204 causes the first actuator 203 to reduce the moving speed or moving displacement of the first objective lens 202, that is, The first objective lens 202 is driven to suppress vibration. Thereby, the influence of the vibration applied to the optical disc apparatus on the first objective lens 202 is reduced. Further, the second detection means 209 detects that the first objective lens 202 has been moved and displaced by vibration. Based on the output as the detection result of the second detecting means 209, the second driving means 208 causes the second actuator 206 to reduce the moving speed or moving displacement of the second objective lens 205, that is, The second objective lens 205 is driven to suppress vibration. As a result, the influence of vibration applied to the optical disc apparatus on the second objective lens 205 is reduced. Each of the first detection means 207 and the second detection means 209 basically has the same configuration as the first detection means 107 (FIG. 5) in the optical disk apparatus of the first embodiment. To do. That is, in the case of the configuration using the back electromotive force of the actuator, the first detection unit 207 uses the back electromotive voltage generated in the second actuator 206 to determine the moving speed and the moving displacement amount of the second objective lens 205. The second detection means 209 detects the moving speed and the moving displacement amount of the first objective lens 202 using the back electromotive voltage generated in the first actuator 203.

  The first actuator 203 and the second actuator 206 can respectively drive the first objective lens 202 and the second objective lens 205 in at least one of or both the focus direction and the tracking direction. When the first actuator 203 drives the first objective lens 202 in the focus direction, the second actuator 206 also drives the second objective lens 205 in the focus direction, and the first actuator 203 moves to the first objective. When driving the lens 202 in the tracking direction, the second actuator 206 also drives the second objective lens 205 in the tracking direction.

  Based on the detection result (output) of the first detection means 207, when the first drive means 204 drives the first actuator 203, the drive amount for driving the first actuator 203 is determined as the first objective lens. It may be determined according to the mass ratio between 202 and the second objective lens 205, or the mass ratio of the movable parts driven by the actuators 203 and 206, sensitivity, and the like. Similarly, when the second drive unit 208 drives the second actuator 206 based on the detection result (output) of the second detection unit 209, the drive amount for driving the second actuator 206 is set to the second amount. It may be determined according to the mass ratio between the objective lens 205 and the first objective lens 202 or the mass ratio of the movable part driven by the actuators 206 and 203, the sensitivity, and the like.

  The first objective lens 202 and the second objective lens 205 only need to be provided with actuators that can be driven independently, and both objective lenses 202 and 205 may be provided on the same optical head. Alternatively, it may be provided on another optical head.

  According to the second embodiment as well, even when disturbances such as vibration and impact are applied to the optical disc apparatus, it is possible to suppress the vibration of the objective lens during the recording or reproducing operation. Deterioration can be prevented. Moreover, since the configuration does not use an acceleration sensor or the like, an increase in manufacturing cost can be suppressed.

FIG. 3 is a configuration diagram of an optical disc apparatus as a third embodiment of the present invention.
In FIG. 3, 301 is an optical disk, 302 is a first objective lens, 303 is a first actuator that drives the first objective lens in a focus direction or a tracking direction, and 304 is a first actuator that drives the first actuator 303. 1 driving means, 305 is a second objective lens, 306 is a second actuator that drives the second objective lens 305 in a focus direction or a tracking direction, and 307 is a displacement of the second objective lens 305 due to vibration. That is, the first detecting means for detecting the moving speed or the moving displacement amount due to the vibration of the second objective lens 305, 308 is the second driving means for driving the second actuator 306, and 309 is the first That the objective lens 302 of the first objective lens 302 is moved and displaced by vibration, that is, the first objective lens 302 is vibrated. Second detecting means for detecting the moving speed or the moving displacement amount of, 310 is a control means for controlling the first driving means 304 and the second driving means 308.

  In FIG. 3, when vibration is applied to the optical disc apparatus, acceleration due to vibration is generated in the first objective lens 302 and the second objective lens 305. At this time, the first detection means 307 detects that the second objective lens 305 is moved and displaced by vibration. Based on the output as the detection result of the first detecting means 307, the first driving means 304 causes the first actuator 303 to reduce the moving speed or moving displacement of the first objective lens 302, that is, The first objective lens 302 is driven to suppress vibration. Thereby, the influence of the vibration applied to the optical disc apparatus on the first objective lens 302 is reduced. Further, the second detection means 309 detects that the first objective lens 302 has been moved and displaced by vibration. Based on the output as the detection result of the second detecting means 309, the second driving means 308 causes the second actuator 306 to reduce the moving speed or moving displacement of the second objective lens 305, that is, The second objective lens 305 is driven to suppress vibration. Thereby, the influence on the second objective lens 305 due to the vibration applied to the optical disc apparatus is reduced. Each of the first detection means 307 and the second detection means 309 basically has the same configuration as the first detection means 107 (FIG. 5) in the optical disk apparatus of the first embodiment. To do. That is, in the case of the configuration using the back electromotive force of the actuator, the first detection unit 307 uses the back electromotive voltage generated in the second actuator 306 to determine the moving speed and the moving displacement amount of the second objective lens 305. The second detecting means 309 detects the moving speed and the moving displacement amount of the first objective lens 302 using the back electromotive voltage generated in the first actuator 303.

  The control unit 310 selects either the detection result (output) of the first detection unit 307 or the detection result (output) of the second detection unit 309, and selects the output of the first detection unit 307. When the output of the selected first detection means 307 is controlled, the first driving means 304 is controlled. When the output of the second detection means 309 is selected, the output of the selected second detection means 309 is selected. Based on this, the second driving means 308 is controlled. The first actuator 303 drives the first objective lens 302 and the second actuator 306 drives the second objective lens 305 according to the selection result by the control means 310.

  The control unit 310 determines the drive amount for driving the first actuator 303 with respect to the vibration detected by the first drive unit 304, the output of the first detection unit 307, and the control state of the first objective lens 302 (see FIG. The amount of drive for driving the second actuator 306 with respect to the vibration detected by the second drive unit 308 is controlled by the second detection unit 309. Control is performed in accordance with the output and the control state (focus control or tracking control state) of the second objective lens 305. For example, when a laser spot is generated on the optical disc 301 by the first objective lens 302 and a recording or reproducing operation is performed by performing servo control, the moving speed or the moving variable generated in the first objective lens 302 by vibration is It is reduced to some extent by servo control. For this reason, in the second detection means 309 that detects the moving speed or the moving displacement amount of the first objective lens 302, the detection sensitivity to vibration becomes dull. In this case, the first detection means 307 detects the movement speed or movement displacement amount of the second objective lens 305 that is not performing servo control, and based on the detection result (output), the first drive means 304 or the second The second driving means 308 drives the corresponding actuator, thereby improving the detection sensitivity to vibration and improving the vibration resistance stability. Conversely, when servo-controlling the second objective lens 305, based on the detection result (output) of the second detection means 309 that detects the moving speed or the moving displacement amount of the first objective lens 302, The first driving unit 304 or the second driving unit 308 drives the corresponding actuator to improve the detection sensitivity for vibration.

  In addition, the control unit 310 includes a calculation unit inside, and the arrangement and vibration of the objective lenses 302 and 305 are detected from the detection result by the first detection unit 307 and the detection result by the second detection unit 309. A driving amount related to the direction and the control state of the objective lenses 302 and 305 may be calculated, and the first driving unit 304 and the second driving unit 308 may be controlled based on the calculation result.

  The first driving unit 304 and the second driving unit 308 may not have the same driving amount for driving the corresponding actuator. The first driving unit 308 drives the second actuator 306 by making the driving amount smaller than the driving amount by which the first driving unit 304 drives the first actuator 303, so that the first detecting unit 307 It becomes easy to detect the vibration (movement speed, amount of movement displacement) of the second objective lens 305. Further, the drive amount for driving the corresponding actuator by the first drive unit 304 and the second drive unit 308 is changed according to the direction of the moving speed of the second objective lens 305 detected by the first detection unit 307. It may be. For example, when the first detection unit 307 detects the movement speed in the focus direction of the second objective lens 305 due to vibration, the direction of the movement speed is in a direction in which the second objective lens 305 and the optical disc 301 approach each other. In some cases, the sensitivity of the first detection means 307 can be increased even for small vibrations by reducing the drive amount of the second drive means 308 relative to the second actuator 306, and the first objective lens 302. It is easy to avoid contact with the surface of the optical disc 301.

  The first objective lens 302 and the second objective lens 305 only need to be provided with actuators that can be driven independently, and both objective lenses 302 and 305 may be provided on the same optical head. Alternatively, it may be provided on another optical head.

  Also according to the third embodiment, when disturbances such as vibration and impact are applied to the optical disk apparatus, particularly the vibration of the objective lens during the recording or reproducing operation can be suppressed, so that the recording quality and the reproducing quality are deteriorated. Can be prevented. Further, since an acceleration sensor or the like is unnecessary, an increase in manufacturing cost can be suppressed.

FIG. 4 is a diagram showing an example of the configuration of an optical disc apparatus as a fourth embodiment of the present invention.
In FIG. 4, 401 is an optical disk, 402 is a first objective lens, 403 is a first actuator that drives the first objective lens 402 in the focus direction or tracking direction, and 404 is a first actuator 403. First driving means, 405 a second objective lens, 406 a second actuator that drives the second objective lens 405 in the focus direction or tracking direction, and 407 the second objective lens 405 moved by vibration First detecting means 408 for detecting the displacement, that is, the moving speed or the moving displacement amount due to the vibration of the second objective lens 405, is a second driving means for driving the second actuator 406. Both the first drive unit 404 and the second drive unit 408 are driven based on the detection result (output) of the first detection unit 407.

  Each of the first actuator 403 and the second actuator 406 can drive the first objective lens 402 and the second objective lens 405 in at least one of or both the focus direction and the tracking direction. When the first actuator 403 drives the first objective lens 402 in the focus direction, the second actuator 406 also drives the second objective lens 405 in the focus direction, and the first actuator 403 is driven by the first objective lens 403. When driving the lens 402 in the tracking direction, the second actuator 406 also drives the second objective lens 405 in the tracking direction.

  In FIG. 4, when vibration is applied to the optical disc apparatus, acceleration due to vibration is generated in the first objective lens 402 and the second objective lens 405. At this time, the first detection means 407 detects that the second objective lens 405 is moved and displaced by vibration. Based on the output as the detection result of the first detecting means 407, the first driving means 404 causes the first actuator 403 to reduce the moving speed or moving displacement of the first objective lens 402, that is, The first objective lens 402 is driven to suppress vibration, and the second driving means 408 causes the second actuator 406 to reduce the moving speed or the moving displacement of the second objective lens 405. That is, the second objective lens 405 is driven to suppress vibration. Thereby, the influence on the first objective lens 402 and the influence on the second objective lens 405 due to the vibration applied to the optical disc apparatus are reduced. That is, by detecting the vibration of the second objective lens 405 by the first detecting means 407, the influence of the vibration on both the first objective lens 402 and the second objective lens 405 is reduced. is there. It is assumed that the first detection means 407 basically has the same configuration as the first detection means 107 (FIG. 5) in the optical disc apparatus of the first embodiment. That is, in the case of the configuration using the back electromotive force of the actuator, the first detection unit 407 uses the back electromotive voltage generated in the second actuator 406 to determine the moving speed and the moving displacement amount of the second objective lens 405. To detect.

The driving amounts for driving the corresponding actuators 403 and 406 by the first driving unit 404 and the second driving unit 408 may not be the same. For example, when the driving amount that the second driving unit 408 drives the second actuator 406 is smaller than the driving amount that the first driving unit 404 drives the first actuator 403, the first detection is performed. The means 407 can easily detect the vibration (movement speed, movement displacement amount) of the second objective lens 305. Further, the driving amount by which the first driving unit 404 and the second driving unit 408 drive the corresponding actuators 403 and 406 according to the direction of the moving speed of the second objective lens 405 detected by the first detecting unit 407. May be changed. For example, when the first detection unit 407 detects the moving speed in the focus direction due to the vibration of the second objective lens 405, the direction of the moving speed is in a direction in which the second objective lens 405 and the optical disc 401 approach each other. In some cases, by reducing the driving amount of the second driving unit 408 with respect to the second actuator 406, the sensitivity of the first detecting unit 407 can be increased even for small vibrations, and the first objective lens It is possible to easily avoid contact of the optical disk 401 with the surface 402.
The first objective lens 402 and the second objective lens 405 may be provided with actuators that can be driven independently, and both objective lenses 402 and 405 may be provided on the same optical head. Alternatively, it may be provided on another optical head.

  Also with the optical disk apparatus of the fourth embodiment, the vibration of the objective lens during recording or reproducing operation can be suppressed, so that the stability of the apparatus against disturbance can be improved, and the recording quality and reproduction quality are deteriorated. Can be prevented. Further, an increase in manufacturing cost can be suppressed.

  The above-described effects in the above-described embodiments are particularly remarkable when the optical disc apparatus is a portable device such as a notebook personal computer, a portable audio player, a portable video device, or an optical disc video camera.

1 is a configuration example diagram of an optical disc apparatus as a first embodiment of the present invention. FIG. It is a block diagram of an optical disc apparatus as a second embodiment of the present invention. It is a structural example figure of the optical disk apparatus as a 3rd Example of this invention. It is a structural example figure of the optical disk apparatus as a 4th Example of this invention. It is a structural example figure of the detection means which detects that the objective lens moved and displaced.

Explanation of symbols

101, 201, 301, 401 ... optical disc,
102, 202, 302, 402 ... first objective lens,
103, 203, 303, 403 ... first actuator,
104, 204, 304, 404 ... first driving means,
105, 205, 305, 405 ... second objective lens,
106, 206, 306, 406 ... second actuator,
107, 207, 307, 407 ... first detection means,
208, 308, 408 ... second driving means,
209, 309 ... second detection means,
310 ... control means,
501: First resistance,
502 ... second resistance,
503 ... a third resistor,
504 ... Actuator,
505: Operating voltage detection means.

Claims (7)

An optical disc apparatus that records or reproduces information by irradiating an optical disc with laser light through an objective lens,
First and second objective lenses;
A first actuator for driving the first objective lens in a focus direction or a tracking direction;
First driving means for driving the first actuator;
A second actuator for driving the second objective lens in a focus direction or a tracking direction;
First detection means for detecting that the second objective lens has moved and displaced;
And the first driving means drives the first actuator so as to reduce the moving speed or the moving displacement of the first objective lens based on the output of the first detecting means. An optical disc apparatus characterized by the above. The optical disc apparatus according to claim 1,
Second driving means for driving the second actuator;
Second detection means for detecting that the first objective lens has moved and displaced;
And the second driving means drives the second actuator to reduce the moving speed or the moving displacement of the second objective lens based on the output of the second detecting means. An optical disc apparatus characterized by the above. The optical disc device according to claim 2,
When either the output of the first detection means or the output of the second detection means is selected and the output of the first detection means is selected, the first drive means is controlled based on the selected output. And when the output of the second detection means is selected, the control means for controlling the second drive means based on the selected output,
An optical disc apparatus characterized in that the first actuator drives the first objective lens or the second actuator drives the second objective lens according to a selection result by the control means. The optical disc apparatus according to claim 1,
Second driving means for driving the second actuator, wherein the first driving means drives the first actuator based on the output of the first detection means, and the second driving means An optical disc apparatus configured to drive the second actuator. The optical disc apparatus according to any one of claims 1 to 4,
The optical disc apparatus according to claim 1, wherein the first detection means is configured to detect that the second objective lens has moved and displaced by detecting a counter electromotive voltage generated in the second actuator. An optical disc apparatus according to any one of claims 2 to 4,
The optical disc apparatus, wherein the second detection means is configured to detect that the first objective lens has moved and displaced by detecting a counter electromotive voltage generated in the first actuator. The optical disc device according to claim 1, wherein
An optical disc apparatus characterized in that a driving amount by which the first driving means drives the first actuator is determined in accordance with an output of the first detecting means.

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