JP2002208236A - Pickup drive mechanism for disk recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a sliding load during ordinary time in order to withstand the load fluctuation, etc., arising in sliding and driving on the inner and outer peripheries of the disk of a pickup and to suppress idling of a driving screw by the load fluctuation. SOLUTION: The back side of a gear section 1a of a rack spring 1 is provided with control members (5a, 5b, 5c and 5d) to add an auxiliary load to the spring. The control members operate to not to add the auxiliary load to the rack spring in a stationary load sliding state. The control member 5 operate to add the auxiliary load to the rack spring in order the avoid the idling of the driving screw by the floating up from the driving screw of the gear section 1a when the load fluctuation to increase the load occurs (Figure 5). The control members operate to release the addition of the auxiliary load to the rack spring in order to avoid the penetration of the driving screw when the load fluctuation to increase the load increases further.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing apparatus having a function of recording or reproducing a disk medium as a recording medium, and more particularly to a pickup mechanism of the disk recording / reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, digital images have been widely used, and a camera-type optical disk video for recording digital image data as a moving image on a magneto-optical disk recording medium such as an MD or MO. Cameras are emerging. In the case of a camera body video recording a moving image, the recording state is always linear with respect to time on a magnetic recording tape medium such as a VTR (VHS, 8 mm), but is recorded on a magneto-optical disk represented by an MD or MO. Since the image (data) is managed in the management area, no matter where the data is recorded on the disc, the pickup is accessed, accessed and read from that information, so the image (data) is displayed linearly. Is possible, but the recording state of data is not always linear.

[0003] In the case of a disc, when additional recording is to be performed on a disc that has already been fragmented due to partial erasure or the like, a recordable area is accessed from information recorded in a management area and recorded. The structure of the mechanism is, as shown in FIGS. 9, 10 and 11, a pickup 4 for recording and reproducing data at a target position on the disk 3, and a driving means for transferring the pickup 4 to the target position. A seek motor (not shown) serving as a drive source of the drive motor, a drive screw 2 having a reduction ratio set by the seek motor, and being rotated by a drive motor of the seek motor,
Pickup 4 by receiving the driving force due to the rotation of
And a rack spring 1 for sliding the inner and outer circumferences with respect to the optical disc 3.

A rack spring 1 is fixed to a pickup 4 and presses a gear portion against a driving screw 2 by a pressing force of a predetermined load. The drive screw 2 is rotated by the rotation of the seek motor, and the rotational force is converted by the rack spring 1 into a sliding motion of the pickup 4 to the inner and outer circumferences of the disk.
The pickup 4 is driven to a target position to record and reproduce data on the optical disc 3.

[0005]

However, in the magneto-optical disk recording / reproducing apparatus, the pickup 4 is frequently accessed, and when the rack spring 1 is used, the pressing force of the rack spring 1 against the drive screw 2 is predetermined. When the load is larger than the load, the pickup 4 is affected as an overload when the pickup 4 slides on the inner and outer circumferences.

On the other hand, if the pressing force of the rack spring 1 on the drive screw 2 is smaller than a predetermined load, the load when the pickup 4 slides on the inner and outer circumferences can be reduced by reducing the lateral pressure on the drive screw 2. The reaction force received from the drive screw 2 easily exceeds the pressing force of the rack spring 1 in response to a rapid change in posture due to the change of the disk device itself or a load change due to an impact, and the gear portion of the rack spring 1 is disengaged from the drive screw 2. , The idle rotation of the drive screw 2 occurs.

For this reason, with the pressing force of the single rack spring 1 based on the spring constant, the sliding load is reduced by reducing the lateral pressure applied to the driving screw 2 by the pressing force, and the rack spring 1 is reduced by the reaction force caused by the load fluctuation. It is difficult to suppress the occurrence of the phenomenon in which the gear portion comes off and the driving screw 2 runs idle.

Further, if the pressing force of the rack spring 1 against the driving screw 2 is increased in order to suppress the idling phenomenon, the gear portion of the rack spring 1 is normally pressed to the pressing position (substantially the screw of the driving screw). When shifting from the bottom position) to the tooth jump position (thread position of the drive screw) where the idle rotation occurs, the pressing force on the drive screw 2 increases, and a biting phenomenon that prevents the rotation of the drive screw 2 occurs. It has been difficult to prevent the occurrence of the biting phenomenon.

[0009]

In order to solve the above problems, the present invention mainly employs the following configuration.

A pickup for recording or reproducing a signal on or from a disc-shaped recording medium, a motor for moving the pickup in the inner and outer peripheral directions of the disc, a drive screw rotating at a predetermined speed ratio in conjunction with the motor, A rack spring fixed to the pickup and having a gear portion that presses the drive screw with an urging force, the pickup driving mechanism of the disc recording and reproducing apparatus comprising: A control member for applying a load is provided, and the control member applies an auxiliary load to a pressing force on the drive screw by the rack spring in a steady load sliding state in a process of sliding the pickup in the inner and outer peripheral directions of the disk. The pickup operates so as not to add the load, and when a load fluctuation occurs in which the load becomes large in the load sliding state of the pickup, the gear is operated. The control member operates to apply an auxiliary load to the pressing force applied to the drive screw by the rack spring in order to prevent the drive screw from idling due to the lifting of the portion from the drive screw. The pickup driving mechanism of the disk recording / reproducing apparatus, wherein the control member operates to cancel the application of the auxiliary load to the pressing force of the rack spring on the driving screw in order to avoid a driving screw biting phenomenon when the driving force increases.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pickup drive mechanism of a disk drive according to an embodiment of the present invention will be described below with reference to the drawings. 1 to 7 show examples of the configuration of a pickup mechanism according to an embodiment of the present invention. As shown in FIGS. 1, 2 and 3, the entire configuration of the pickup drive mechanism of the disk device is as follows: a pickup 4 for recording / reproducing at a predetermined position on the optical disk 3; A seek motor (not shown) serving as a drive source as drive means for transferring the drive screw, the drive screw 2 having a predetermined reduction ratio from the seek motor and rotating by a drive force of the seek motor, A rack spring 1 that slides the pickup 4 in and out of the optical disc 3 by receiving a driving force due to the rotation of the driving screw 2.

The rack spring 1 is fixed to the pickup 4, and a gear 1a at the tip of the rack spring 1 abuts on the driving screw 2 with a predetermined pressing force by the urging force of the rack spring itself. 2 rotates, and the rotational force is converted by a rack spring 1 into a seek (sliding) movement (a horizontal movement on the paper surface in FIG. 2) of the pickup 4 to the inner and outer circumferences of the disk, and the pickup 4 is moved to a predetermined position.
Is driven to record and reproduce data on the optical disk 3.

Further, the pickup driving mechanism according to the embodiment of the present invention has a control member 5 for optimally controlling the pressing force on the rack spring 1. The control member 5 is disposed on the rear side of the gear portion 1a (the one that contacts the drive screw 2) at the tip of the rack spring 1, and
Operates in response to a change in the pressing force of the rack spring 1 due to a change in the load caused in response to various movements of the pickup 4 during the inner and outer sliding.

Referring to the structures shown in FIGS. 4 to 7 in addition to FIGS. 1 to 3, the control member 5 disposed on the pickup 4 includes a pressurizing member holding table 5a, a pressurizing spring member 5b. , A pressurizing member 5c, and an auxiliary spring (auxiliary SPR) 5d. Here, the pressurizing member holding base 5a is cantileverly mounted on the pickup 4 in a cantilever manner, and in a first predetermined load position during normal operation (see FIG. 4).
The distal end of the movable portion of the pressurizing member holding table 5a contacts the pressurizing member 5c with the back surface of the gear portion 1a of the rack spring 1, and is picked up by a height holding portion 4a (part of the pickup) having a predetermined height to which no auxiliary load is applied. 4 abuts.

The pressurizing spring member 5b has a spring structure and functions as an auxiliary pressing force by which the gear portion 1a of the rack spring 1 presses the driving screw 2 by pressing one end of the pressurizing member 5c. Further, the pressurizing member 5c is in contact with the back surface of the gear portion 1a of the rack spring 1 at the first predetermined load position, and has a predetermined height at which the auxiliary load by the pressurizing spring member is not applied. Is held in. Further, the auxiliary SPR 5d includes the pressurizing member holding table 5a and the pressurizing member 5
c, which is inserted between the rack spring side end and the pressurizing member holding base.

The specific operation mode of the present embodiment will be described. In the process of slidingly driving the pickup 4 to the inner and outer circumferences of the disk (left and right on the paper surface in FIG. 2), the first operation in the normal operation shown in FIG. At a predetermined load position, the pressurizing member 5c
Are urged by the pressurizing spring member 5b in the direction of pressing the rear surface of the gear portion of the rack spring 1 and are in contact with the rack spring 1.
The pressurizing member holding table 5a is a height holding portion 4a of the pickup 4.
, The pressurizing member 5c is connected to the rack spring 1
Is held at a position where no auxiliary load is applied to the gear portion 1a. As a result, at the first load position shown in FIG. 4, the reduction of the side pressure applied to the drive screw, that is, the reduction of the sliding load is achieved.

Next, when the pickup 4 slides on the inner and outer circumferences of the disk, the attitude of the disk device itself changes rapidly due to a change in the position of the disk device, and a load fluctuates due to an impact. Screw 2
At the same time, the rack spring 1 is lifted from the first predetermined load position, and at the same time, an auxiliary load from the pressurizing spring member 5b is added to the pressurizing member 5c disposed on the rear surface of the rack spring 1, thereby causing the load fluctuation. To prevent the rack spring 1 from lifting up, thereby suppressing the idling phenomenon of the drive screw. That is, at the intermediate position (the position between the first load position and the second load position) shown in FIG.
Thus, it is possible to prevent the gear portion 1a from easily moving to the idling position due to the newly added auxiliary load to the rack spring.

Further, when the rotational force of the driving screw 2 is greater and the force for pushing up the rack spring 1 is further increased, the control is performed in conjunction with the lifting of the gear portion 1a of the rack spring 1 in accordance with the rightward movement of the pressurizing member 5c as shown in the figure. The members 5a and 5b move toward the second predetermined load position.

Subsequently, at the time when the second predetermined load position shown in FIG. 6 is reached, the pressurizing spring member 5b, which has pressed the pressurizing member 5c and applied the auxiliary load, is interlocked with the lifting of the rack spring 1. Pushed up by the pressure member holding table 5a,
It comes off from one end of the pressurizing member 5c. As described above, when the pressurizing member 5c is disengaged from the pressurizing spring member 5b, no auxiliary load is applied to the pressurizing member, and the gear portion 1a of the rack spring 1 is easily disengaged from the gear of the driving screw 2, and the driving screw It has the function of suppressing the occurrence of the biting phenomenon of the gear that prevents the rotation of the gear. That is, when the load variation applied to the pickup becomes extremely large, the idle rotation mode is performed by eliminating the application of the auxiliary load with an emphasis on eliminating the biting phenomenon of the gear.

FIG. 7 shows a state in which the load on the pickup is shifted from a very large state to a reduced state, that is, a state after the pickup reaches the second load position. Is released, and a situation in which the idle rotation suppression state is quickly dealt with again is shown.

Next, FIG. 8 shows that in the first load position in the normal state, when the lateral pressure on the drive screw 2 by the gear portion 1a is smaller than a specified value, or when the lateral pressure is slightly increased. In the case where is desired, means for adjusting the auxiliary load by the control member 5 is shown. According to the specific configuration shown in FIG. 8, at the first predetermined load position, the pressurizing member 5c is urged by the pressurizing spring member 5b in the direction of pressing the gear unit back surface of the rack spring 1,
One end of the pressurizing member holding table 5a contacts the height adjusting member 5f arranged on the pickup 4. Auxiliary spring 5d
The pressurizing member 5c is held on the gear unit back surface of the rack spring 1 by the cooperation of the pressurizing member holding table 5a and the pressurizing member holding table 5a. Here, in the embodiment shown in FIG. 8, the height is changed by rotating the height adjusting member 5f having a screw function (a specific example of the height adjusting mechanism can adopt a well-known common means), thereby providing the interlocking movement. Pressure member holder 5
When one end of “a” approaches or separates from the rack spring 1, the pressurizing member 5 c functions to adjust the auxiliary load of the rack spring 1 on the gear portion 1 a. That is, if the height of the height adjusting member 5f using the screw is reduced toward the driving screw, the auxiliary load by the pressurizing spring member 5b is applied to the pressurizing member 5c.

As described above, the feature of the present invention is that a normal sliding load can be applied to the disk 3 because the pickup 4 can withstand load fluctuations or the like generated when the pickup 4 slides on the inner and outer periphery of the disk. The rack spring is provided with a control member for controlling the pressing force to the rack spring in order to reduce the idling of the drive screw 2 due to the load fluctuation received by the pickup 4.

Further, the control member reduces the pressing force of the rack spring 1 against the driving screw 2 in order to prevent the occurrence of the phenomenon that the gear portion of the rack spring 1 bites into the driving screw 2 (which occurs as an adverse effect due to the suppression of idling). Appropriate control is performed according to the magnitude of the load fluctuation.

[0024]

According to the present invention, the sliding load is reduced by reducing the lateral pressure applied to the driving screw by the pressing force of the rack spring, and the attitude of the pickup is changed rapidly by changing the disk device itself received by the pickup when sliding the inner and outer circumferences of the disk. In addition, the gear portion of the rack spring is lifted due to a load change due to the shock or the impact, and the engagement with the drive screw is disengaged, and the occurrence of a phenomenon in which the drive screw idles can be suppressed.

When the pressing force of the rack spring against the driving screw is increased to suppress the idling phenomenon, the pressing force against the driving screw is increased to cause the screw biting phenomenon, but the biting phenomenon is prevented. Can be.

As described above, it is possible to reduce the shaft loss in the driving screw portion caused by the pressing force of the rack spring in a steady state, and to improve the resistance to the load fluctuation applied to the pickup.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a pickup driving mechanism according to an embodiment of the present invention.

FIG. 2 is a top view illustrating an overall configuration of a pickup driving mechanism according to the embodiment of the present invention.

FIG. 3 is a side view showing an overall configuration of a pickup driving mechanism according to the embodiment of the present invention.

FIG. 4 illustrates a first example of the pickup driving mechanism according to the embodiment.
FIG. 5 is an operation sectional view at a predetermined load position.

FIG. 5 illustrates a first example of the pickup driving mechanism according to the embodiment.
FIG. 8 is an operation cross-sectional view at an intermediate position during a transition from a predetermined load position to a second predetermined load position.

FIG. 6 illustrates a second example of the pickup driving mechanism according to the embodiment.
FIG. 7 is an operation sectional view when a predetermined load position is reached.

FIG. 7 illustrates a second example of the pickup driving mechanism according to the embodiment.
FIG. 7 is an operation sectional view after reaching a predetermined load position.

FIG. 8 is an operation sectional view of a pickup driving mechanism with a control member height adjusting mechanism in a first predetermined load position according to the embodiment of the present invention.

FIG. 9 is a perspective view showing a conventional pickup drive mechanism.

FIG. 10 is a top view showing a conventional pickup driving mechanism.

FIG. 11 is a side view showing a conventional pickup driving mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rack spring 1a Gear part (hatched part) of rack spring 2 Drive screw 3 Recording / reproducing disk 4 Pickup unit 4a Height holding part 5 Control member 5a Pressurizing member holding stand 5b Pressurizing spring member 5c Pressurizing member 5d Auxiliary spring (auxiliary SPR) ) 5f Height adjustment member 6 Main shaft

Claims (3)

[Claims] 1. A pickup for recording or reproducing a signal on or from a disk-shaped recording medium, a motor for moving the pickup in the inner and outer peripheral directions of the disk, and a drive screw rotating at a predetermined speed ratio in conjunction with the motor. And a rack spring fixed to the pickup and having a gear portion for pressing the drive screw with an urging force, the pickup driving mechanism of the disc recording / reproducing apparatus comprising: a rear side of the gear portion of the rack spring. A control member for applying an auxiliary load to the drive screw in a steady load sliding state in a process of sliding the pickup in the inner and outer peripheral directions of the disk. Operates so as not to apply a load, and when a load change occurs in which the load becomes large in the load sliding state of the pickup, the The control member operates to apply an auxiliary load to the pressing force applied to the drive screw by the rack spring in order to avoid the drive screw idling due to the lifting of the gear portion from the drive screw. The disk recording / reproducing apparatus according to claim 1, wherein, when further increased, the control member operates so as to cancel the addition of the auxiliary load to the pressing force of the rack spring on the driving screw, in order to avoid the driving screw biting phenomenon. The pickup drive mechanism of the device. 2. The pickup driving mechanism for a disk recording / reproducing apparatus according to claim 1, wherein the control member is used in the steady load sliding state instead of an operation in which no auxiliary load is added in the steady load sliding state. A pickup driving mechanism for a disk recording / reproducing device, wherein the pickup driving mechanism is adjusted to apply a predetermined auxiliary load. 3. A pickup for recording or reproducing a signal on or from a disk-shaped recording medium, a motor for moving the pickup in the inner and outer peripheral directions of the disk, and a drive screw rotating at a predetermined speed ratio in conjunction with the motor. And a rack spring fixed to the pickup and having a gear portion for pressing the drive screw with an urging force, the pickup driving mechanism of the disc recording / reproducing apparatus comprising: a rear side of the gear portion of the rack spring. A control member that applies an auxiliary load to the rack member, the control member includes a pressurizing member that is in contact with the rear side of the rack spring, a pressurizing member holding table that holds the pressurizing member, and an auxiliary load to the pressurizing member. And a pressurizing spring member to be applied. In the steady load sliding state in the process of sliding the pickup in the inner and outer peripheral directions of the disc, the pressurizing spring member Without applying an auxiliary load via the pressurizing member, when a load change in which the load becomes large in the load sliding state of the pickup occurs, the movement of the pressurizing member accompanying the lifting of the gear portion occurs. An auxiliary load is added by the elastic force of the pressurizing spring member based on the preload spring member, and when the load fluctuation of the large load further increases, the counterforce of the preload spring member based on the movement of the preload member holding table accompanying the lifting of the gear portion. A pickup driving mechanism for a disk recording / reproducing apparatus, wherein an additional load due to an elastic force of a preload spring member is released by movement in a biasing direction.