KR20080107649A - A skew adjusting apparatus for disk drive - Google Patents

Abstract

A skew adjusting apparatus of a disk drive is provided to reduce the total number of components of the disk drive by using a skew damper which is elastically deformable and blocks the vibration transfer between the main base and the pickup base. A skew adjusting apparatus of a disk drive comprises an optical pickup base(20) in which an optical pick-up is movably installed on a guide axis, a motor plate(40) which is installed on the lower side of the optical pickup base and in which a spindle motor rotating a turn-table in which a disk is loaded, and a skew damper which is made of elastic material to control the relative distance of the motor plate to the optical pick up base.

Description

Skew adjusting apparatus for disk drive

1 is a plan view showing a spindle motor mounting structure of a disk drive according to the prior art.

Figure 2 is a cross-sectional view showing a spindle motor mounting structure of a disk drive according to the prior art.

Fig. 3 is a perspective view showing the main structure of a disk drive employing a preferred embodiment of the skew adjusting apparatus according to the present invention.

Figure 4 is a plan view showing the configuration of a motor plate constituting an embodiment of the present invention.

5 is a perspective view showing the configuration of a skew damper constituting an embodiment of the present invention.

6 is a cross-sectional view showing the configuration of a skew damper constituting an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

20: optical pickup base 22: optical pickup transfer window

24: Optical pickup 26: Objective lens

28: guide shaft 30: slad motor

40: motor plate 42: vertical portion

44: parallel part 50: spindle motor

52: turntable 60: skew damper

60a: fixed skew damper 60b: radial skew damper

60c: tangential skew damper 61: skew screw

62: skew adjusting unit 64: first fixing groove

66: second fixing groove 70: screw insertion hole

72: screw fixing

The present invention relates to a disk drive, and more particularly, to a skew adjusting apparatus of a disk drive for adjusting the skew so that the light provided in the optical pickup is incident and reflected perpendicularly to the disk.

Optical discs, which are optical data recording media, include digital audio discs and digital video discs, which are commonly referred to as compact discs (CDs). The optical disk is clamped in a state of being seated on a turntable rotated by a spindle motor to reflect the laser beam emitted from the optical pickup moving along the radial direction of the optical disk, so that the reflectance of the beam on which the optical pickup is reflected or the phase of the beam at the time of reflection Or read data through polarization change.

In order to record a signal on the signal recording surface of the disk and reproduce the recorded signal in the optical disk player for reproducing the optical disk, it is preferable that the light irradiated from the optical pickup is incident perpendicularly to the signal recording surface of the disk.

In practice, however, the optical path in the optical pickup is inclined, or the spindle motor portion on which the optical disk is mounted is inclined so that an angle error occurs in which the optical axis of the optical pickup and the recording surface of the optical disk are not perpendicular to each other. This angular error can be spectroscopic in the radial direction of the optical disc and in the connection direction of the track, each of which is called a radial skew, a tangential skew.

Such skew causes optical aberration (a phenomenon in which the direction of the light source is different to the observer moving in a direction perpendicular to the direction of light), resulting in deterioration of the read signal. In particular, tangential skew is characteristic of the read signal. This will have a big impact.

Thus, adjusting the optical pickup and the position of the signal recording surface of the disc is called skew adjustment. Skew adjustment can be divided into two types: adjusting the guide shaft for guiding the optical pickup movement and adjusting the installation state of the spindle motor.

1 and 2 show a conventional configuration capable of adjusting the skew by adjusting the installation height of the spindle motor. As shown in these figures, the optical pickup base 1 is provided with an optical pickup 3 so as to be capable of linear reciprocating motion. The optical pickup base 1 is installed on a main base (not shown).

The optical pickup 3 irradiates light onto the signal recording surface of the disk and detects the reflected light, and records or reproduces the recorded signal on the signal recording surface of the disk.

The optical pickup 3 is guided reciprocally while being guided by the guide shafts 4 and 4 'on the optical pickup base 1. Here, the guide shafts 4 and 4 'are supported by guide shaft holders (not shown), both ends of which are respectively provided on the optical pickup base 1.

The driving force for the movement of the optical pickup 3 is generally provided in a slad motor (not shown), and the driving force of the slad motor is transmitted to the optical pickup 3 through a lead screw (not shown). do.

On the other hand, the spindle motor 5 is provided at the tip of the optical pickup base 1 to provide a driving force for the rotation of the disk. The spindle motor 5 is equipped with a motor plate 6 having a configuration for controlling its driving at the bottom.

A plurality of fixed shafts 7 are caulked on the optical pickup base 1. In this case, a spring 8 is inserted into an outer surface of the fixed shaft 7, and the spring 8 is installed between the lower surface of the optical pickup base 1 and the upper surface of the motor plate 6 so as to provide the motor. The plate 6 is supported in a direction away from the optical pickup base 1.

In addition, a skew screw 7 ′ is installed in the fixed shaft 7 through the motor plate 6, and the skew screw 7 ′ moves the motor plate 6 to the optical pickup base 1. At the same time serves to fix the distance between the upper surface of the motor plate 6 and the lower surface of the optical pickup base (1).

In fact, the skew screw 7 'adjusts the height of the spindle motor 5 so that the light irradiated from the optical pickup is focused on the signal recording surface of the disk and is collected at right angles. On the other hand, adjusting the skew screw 7 'is called skew adjustment. For reference, one of the skew screws 7 'becomes a fixed point and the other two have a function of adjusting radial skew and tangential skew, respectively.

On the upper end of the spindle motor (5) is provided a turntable (9) on which a disk is seated. The turntable 9 is rotated by the spindle motor 5 while the disk is seated to rotate the disk.

In the prior art having such a configuration, in order to install the spindle motor 5 on the optical pickup base 1, a plurality of fixing shafts 7 are installed on the optical pickup base 1 by caulking.

Then, the spring 8 is inserted into the fixed shaft 7, and the spindle motor 5 is seated to fasten the skew screw 7 ′. As such, once the fastening is completed, the skew 7 'is adjusted to adjust the skew to " 0 ".

On the other hand, the skew may be adjusted by lifting at least one side of both ends of the guide shafts 4 and 4 '. In this case, a configuration capable of adjusting end heights of the guide shafts 4 and 4 'is provided on the optical pickup base 1.

However, the above-described skew adjusting apparatus for a disc drive according to the prior art has the following problems.

Conventionally, a plurality of separate fixing shafts 7 are manufactured to install the spindle motor 5 to the optical pick-up base 1, and then fixed by caulking to the optical pick-up base 1 and the fixed for skew adjustment. The springs 8 are fitted to the shafts 7 respectively. Therefore, there is a problem in that the configuration for installing the spindle motor 5 and adjusting the skew becomes complicated, resulting in low productivity and high cost.

In addition, when the amount of skew adjustment is large, there is a problem that the motor plate 6 is deformed or the skew screw 7 'is deformed and broken.

The present invention is to solve the problems of the prior art as described above, an object of the present invention is to provide a structure that minimizes the number of components by simplifying the configuration of the skew adjusting device in the disk drive.

Another object of the present invention is to provide a skew adjusting apparatus for a disk drive that can increase the durability of components even when the amount of skew adjusting is large.

According to a feature of the present invention for achieving the object as described above, the present invention comprises an optical pickup base which is installed to be supported on the guide shaft to be movable; A motor plate installed at a lower portion of the optical pickup base and having a spindle motor for rotating a turntable on which a disk is mounted; At least a portion is positioned between the optical pickup base and the motor plate and comprises a skew damper made of a material capable of elastic deformation to adjust the relative distance of the motor plate to the optical pickup base.

The skew damper is formed by protruding a skew adjusting portion positioned to closely contact the optical pickup base and the motor plate, and a first fixing groove for fixing the motor plate is recessed on an outer surface thereof.

A second fixing groove for fixing the lifting base for lifting the optical pickup base is formed in the first fixing groove by being recessed in the outer surface of the skew damper.

The skew damper is formed with a screw insertion hole penetrating through the skew damper, and the screw insertion hole is provided with a stepped screw fixing portion for mounting the head portion of the skew screw to have an inner circumference equal to or larger than the diameter of the skew screw head portion.

The screw fixing portion is formed to be relatively closer to the first fixing groove than the extension line of the second fixing groove.

The skew damper includes a fixed skew damper for fixing a motor plate, a radial skew damper capable of skew adjustment in a transport direction of the optical pickup, and a tangential skew for skew adjustment in a direction orthogonal to the transport direction of the optical pickup. It is configured to include a damper.

The motor plate may include a vertical portion provided orthogonal to a conveying direction of the optical pickup and a parallel portion provided parallel to the conveying direction of the optical pickup, orthogonal to each other, and the fixed skew damper may be located far from the spindle motor. It is provided at one end of the parallel portion, and the radial skew damper and the tangential skew damper are provided at positions perpendicular to each other about the spindle motor in the vertical portion.

The radial skew damper is positioned on a line extending from the fixed skew damper in the transfer direction of the optical pickup.

According to the skew adjusting device of the disk drive according to the present invention having such a configuration, it is possible to reduce the total number of parts of the disk drive by using a skew damper which is capable of elastic deformation and blocks vibration transmission between the pickup base and the main base side. In addition, there is an advantage that the number of assembling process is reduced according to the reduction of parts, and even if the amount of skew adjustment is large, sagging of the motor plate can be prevented, and the skew screw is not easily deformed or broken by suppressing vibration transmission from the outside. There is this.

Hereinafter, a preferred embodiment of a skew adjusting apparatus for a disk drive according to the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

Fig. 3 is a perspective view of the main part of a disk drive employing a preferred embodiment of the skew adjusting device according to the present invention. Fig. 4 is a plan view of the motor plate constituting the embodiment of the present invention. 5 and 6 show a perspective view and a cross-sectional view of a skew damper constituting an embodiment of the present invention.

As shown in these figures, the optical pick-up base 20 is installed so that its tip is elevated by the lifting base 21 (see Fig. 6) provided in the main base (not shown). This is to prevent the optical pickup base 20 from interfering with the disc tray (not shown) during loading and unloading of the disc.

The optical pickup base 20 includes a fixed skew hole 20a, a radial skew hole 20b and a tangential skew hole 20c such that the skew damper 60 to be described below is fixed by the skew screw 61. Is formed. The female screw portion is formed in the fixed skew hole 20a, the radial skew hole 20b and the tangential skew hole 20c to fasten the screw 61s of the skew screw 61 to be described below.

The optical pickup base 20 is formed so that the optical pickup transfer window 22 having a predetermined length and width is opened up and down. The optical pickup transfer window 22 is a portion to which the optical pickup 24 to be described below is moved.

The optical pickup base 20 is movably installed in the optical pickup base 20, and the optical pickup 24 is provided with an objective lens 26 for condensing light on the signal recording surface of the disc. The optical pickup 24 records and reproduces a signal by irradiating light onto a disk and sensing reflected light.

A guide shaft holder (not shown) installed in the optical pickup base 20 supports the guide shaft 28. The guide shaft 28 supports both ends of the optical pickup 24, and the optical pickup 24 irradiates light onto the disk while performing a linear reciprocating motion in the optical pickup transfer window 22. The guide shaft 28 is installed side by side in the direction from the front end of the optical pickup base 20 toward the rear end.

The optical pickup 24 is moved by the driving of the slad motor 30 provided on one side of the optical pickup base 20. The slad motor 30 is a power source for rotating the lead screw (not shown), the gear provided in the optical pickup 24 is engaged with the lead screw.

Referring to FIG. 4, a plate-shaped motor plate 40 is installed on the bottom surface of the front end of the optical pickup base 20. The motor plate 40 is configured in a substantially 'b' shape when viewed in plan view. That is, the motor plate 40 has a vertical portion 42 and a parallel portion 44 are formed perpendicular to each other. In the center of the vertical portion 42 is mounted a spindle motor 50 to be described below.

The vertical portion 42 is a portion formed to extend in a direction orthogonal to the moving direction of the optical pickup 24, and the parallel portion 44 is formed to extend in parallel to the moving direction of the optical pickup 24. It is a part. Through holes 46a, 46b, and 46c are formed at the front ends of the vertical portion 42 and the parallel portion 44, and the portions to which they are connected.

The spindle motor 50 is installed at the center of the vertical portion 42 of the motor plate 40. The turntable 52 is provided at the upper end of the spindle motor 50. The turntable 52 is rotated by the spindle motor 50, the disk is mounted on the upper surface. When the spindle motor 50 is driven, the turntable 52 rotates with the seated disk.

Meanwhile, the through holes 46a, 46b, and 46c formed in the motor plate 40 have skew made of an elastic material to mount the motor plate 40 to the optical pickup base 20 and to adjust the skew. Dampers 60 are provided respectively. The skew damper 60 is formed so that the cross section has a predetermined height in a circular shape. The skew damper 60 is fixed to the optical pickup base 20 by a skew screw 61. A screw portion 61s is provided at the front end of the skew screw 61, and a head portion 61h is provided at the rear end of the skew screw 61 so as to transmit a force.

The skew damper 60 is formed to protrude a skew adjusting unit 62 positioned to closely contact the optical pickup base 20 and the motor plate 40. When the skew screw 61 is applied by the rotation, the skew damper 60 receives a compressive force in a direction perpendicular to the motor plate 40 to change the height H of the skew adjusting unit 62. . As the height H of the skew adjusting unit 62 changes, the relative distance between the optical pickup base 20 and the motor plate 40 is adjusted to perform skew adjustment. A plurality of fixing grooves 64 and 66 are formed around the outer periphery of the skew damper 60 in the lower portion of the skew adjusting unit 62.

The fixing grooves 64 and 66 have a first fixing groove 64 to which the motor plate 40 is fixed and a second lifting base 21 to move the optical pickup base 20 up and down. It consists of a fixing groove (66). However, since the lifting base 21 does not need to be fixed to the fixed skew damper 60a to be described below, the second fixing groove 66 may not be formed.

The skew damper 60 has a fixed skew damper 60a provided at one end of the parallel portion 44 and a lady provided at a position symmetrical with respect to the spindle motor 50 at the vertical portion 42. It consists of the ear skew damper 60b and the tangential skew damper 60c.

The fixed skew damper 60a is provided through the through hole 46a formed in the parallel portion 44 of the motor plate 40. The fixed skew damper 60a is fastened to the fixed skew hole 20a formed in the optical pickup base 20 by the skew screw 61. That is, the fixed skew damper 60a is provided at one end of the parallel portion 44 corresponding to a side relatively far from the spindle motor 50.

The radial skew damper 60b is provided through the through hole 46b formed in the parallel portion 44 adjacent to the vertical portion 42 of the motor plate 40. The radial skew damper 60b is fastened to the radial skew hole 20b formed in the optical pickup base 20 by the skew screw 61. That is, the radial skew damper 60b is provided at a position spaced apart from the spindle motor 50 by a predetermined distance. The radial skew damper 60b is preferably positioned on a line extending from the fixed skew damper 60a in the transfer direction of the optical pickup 24 for accurate skew adjustment.

The tangential skew damper 60c is provided through the through hole 46c formed at one end of the vertical portion 42. The tangential skew damper 60c is fastened to the tangential skew hole 20c formed in the optical pickup base 20 by the skew screw 61. That is, the tangential skew damper 60c is formed at a position symmetrical with the radial skew damper 60b with respect to the spindle motor 50.

A screw insertion hole 70 is formed in the skew damper 60 to penetrate the upper and lower ends of the skew damper 60. The screw insertion hole 70 extends downward from the tip of the skew damper 60 to have the same inner circumference, and a screw fixing part 72 is formed along the circumference of the screw insertion hole 70.

The screw fixing portion 72 of the second fixing groove 66 so that a force is not transmitted to the second fixing groove 66 to which the motor plate 40 is fixed by the head portion 61h during skew adjustment. It is formed stepped on the extension line. The screw fixing part 72 may be formed closer to the first fixing groove 64 than the extension line of the second fixing groove 66 depending on the design condition or material. This is to cause the skew adjustment to occur only between the optical pickup base 20 and the motor plate 40 by causing elastic deformation only in the skew adjusting unit 62. That is, as the screw fixing portion 72 is formed closer to the first fixing groove 64, the elastic force applied to the periphery of the second fixing groove 66 decreases, so that the position change of the elevating base 21 is increased. Does not happen. The diameter of the screw fixing part 72 is formed to be equal to or larger than the diameter of the head portion 61h.

The screw insertion hole 70 is inserted into the screw insertion hole 70 so that the skew adjustment is possible through the skew damper 60, and the head portion 61h of the skew screw 61 is the screw fixing part 72. It will settle on. The screw portion 61s of the skew screw 61 penetrating the screw insertion hole 70 of the skew damper 60 is a fixed skew hole 20a and a radial skew hole 20b formed in the optical pickup base 20. And a tangential skew hole 20c to fix the skew damper 60.

Hereinafter, the operation of the skew adjusting apparatus for the disk drive according to the present invention having the above configuration will be described in detail.

First, the assembly process of the skew adjusting device will be described. The spindle motor 50 is installed on the motor plate 40, and the skew damper 60 is inserted into the motor plate 40. Since the skew damper 60 is made of a material capable of elastic deformation, the skew adjusting part 62 causes deformation and is inserted into the through holes 46a, 46b, and 46c formed in the motor plate 40. In this case, the motor plate 40 is fixed to the first fixing groove 64 of the skew damper 60.

The skew damper 60 is mounted on the optical pickup base 20 in a state where the skew screw 61 is inserted into the skew damper 60 fixed to the motor plate 40. After the skew damper 60 is mounted to the optical pick-up base 20, the skew damper 60 includes a second skew damper 60 b and a second skew groove 66 formed in the radial skew damper 60 c. The lifting base 21 is mounted and fixed by the skew screw 61.

In order to record or play a signal on the disc in the disc drive, the disc is placed on the disc tray. When the disc tray is inserted into the disc drive, the tip of the optical pickup base 20 is raised to seat the disc on the turntable 52. The spindle motor 50 rotates the turntable 52 in which the disk is seated so that the disk is rotated. The optical pickup 24 irradiates light onto the signal recording surface of the disk while linearly reciprocating in the radial direction of the disk along the guide shaft 28. In this way, light can be irradiated to a specific position of the disk by the rotation of the disk and the radial movement of the optical pickup 24.

The light irradiated from the objective lens 26 of the optical pickup 24 should be vertically incident on the signal recording surface of the disk, which requires a skew adjustment. In this embodiment, skew adjustment is performed so that the signal recording surface of the disk and the lens surface of the optical pickup 24 are parallel to each other by adjusting the installation state of the disk side, more precisely, the spindle motor 50.

For the adjustment of the skew by the skew adjusting device, for example, when the skew screw 61 is tightened, the screw portion 61s of the skew screw 61 and the radial skew hole 20b of the optical pickup base 20 are provided. Alternatively, the skew screw 61 is elevated by the screw action of the tangential skew hole 20c or the like. Accordingly, the motor plate 40 is pressed by the head 61h, the height H of the skew adjusting unit 62 is changed, and the position of the spindle motor 50 is adjusted to adjust the skew. .

In more detail the adjustment of the skew through the present embodiment, the parallel portion 44 or the vertical portion 42 of the motor plate 40 is raised and lowered relative to the fixed skew damper 60a. When the skew damper 60 is loosened or tightened with respect to the optical pickup base 20, the head portion 61h of the skew screw 61 exerts pressure on the screw fixing part 72 of the skew damper 60. .

The height H of the skew adjusting part 62 changes due to the pressure applied to the screw fixing part 72. As the height H of the skew adjusting unit 62 changes, the relative position of the optical pickup base 20 and the motor plate 40 changes.

As such, as the relative position of the optical pick-up base 20 and the motor plate 40 is changed, the inclination of the spindle motor 50 installed in the motor plate 40 is changed to cause skew adjustment.

This skew adjustment is a radial skew adjustment in which the height adjustment is performed in a direction parallel to the moving direction of the optical pickup 24 and a tangential skew adjustment in which the height adjustment is performed in a direction orthogonal to the moving direction of the optical pickup 24. Can be applied separately in detail.

When the radial skew damper 60b is loosened or tightened with respect to the optical pickup base 20, the motor plate 40 is far from the optical pickup base 20 by the elastic force of the radial skew damper 60b. As you lose or get closer, the radial skew is adjusted.

On the other hand, adjusting the tangential skew is to loosen or tighten the tangential skew damper 60c with respect to the optical pick-up base 20, so that the motor plate 40 is based on the fixed skew damper 60a. By moving closer to or farther away).

The distance and angle between the optical pick-up base 20 and the motor plate 40 are adjusted by adjusting the radial skew and the tangential skew based on the fixed skew damper 60a. Therefore, by adjusting the height of the motor plate 40 on which the spindle motor 50 is mounted as described above, the light irradiated from the optical pickup 24 supported by the guide shaft 28 is transmitted to the turntable 52. The skew adjustment is completed by adjusting it so as to be perpendicular to the signal recording surface of the seated disk. When the skew adjustment is performed in this manner, the light of the optical pickup 24 is incident perpendicularly to the signal recording surface of the disc, so that the recording or reproduction of the signal can be accurately performed.

The rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications and adaptations within the scope of the claims. It is self-evident.

As described above, according to the skew adjusting apparatus of the disk drive according to the present invention, the following effects can be expected.

First, the skew adjusting device of the disc drive according to the present invention is capable of elastic deformation and using a skew damper to block the vibration transmission between the pick-up base and the main base side, so that the total number of parts of the disc drive can be reduced, and the number of parts is reduced. As a result, the number of assembly processes is reduced.

In addition, since the motor plate is coupled to the skew damper capable of elastic deformation, the present invention can prevent the motor plate from sagging even when the skew adjustment amount is large, and the skew screw can be easily deformed or broken by suppressing vibration transmission from the outside. It does not work.

Claims (8)

An optical pickup base to which the optical pickup is movably supported by the guide shaft; A motor plate installed at a lower portion of the optical pickup base and having a spindle motor for rotating a turntable on which a disk is mounted; And a skew damper formed of a material that is elastically deformed so that at least a portion thereof is positioned between the optical pickup base and the motor plate so as to adjust a relative distance of the motor plate with respect to the optical pickup base. Skew adjuster. The skew damper of claim 1, wherein the skew damper is formed to protrude from a skew adjusting part positioned to closely contact between the optical pickup base and the motor plate, and a first fixing groove for fixing the motor plate is recessed on an outer surface thereof. Disk drive skew adjusting device. The skew adjusting apparatus of claim 2, wherein the first fixing groove is formed with a second fixing groove for fixing the lifting base for lifting the optical pick-up base into the outer surface of the skew damper. According to claim 3, wherein the skew damper is a screw insertion hole is formed through the skew damper, the screw insertion hole is provided with a screw fixing to which the head portion of the screw screw is mounted so as to have an inner circumference equal to or larger than the diameter of the screw screw head portion; Skew adjusting device of the disk drive, characterized in that formed stepped. The skew adjusting apparatus of claim 4, wherein the screw fixing part is formed to be relatively closer to the first fixing groove than the extension line of the second fixing groove. The skew damper according to any one of claims 1 to 5, A fixed skew damper for fixing the motor plate, A radial skew damper capable of adjusting the skew in the transport direction of the optical pickup; And a tangential skew damper capable of skew adjustment in a direction orthogonal to the transfer direction of the optical pickup. The method of claim 6, wherein the motor plate, A vertical portion provided at right angles to the transfer direction of the optical pickup; Parallel portions provided to be parallel to the transfer direction of the optical pickup are formed orthogonal to each other, The fixed skew damper is provided at one end of the parallel part that is far from the spindle motor, and the radial skew damper and the tangential skew damper are provided at positions perpendicular to each other about the spindle motor at the vertical part. Disk drive skew adjusting device. 8. The apparatus of claim 7, wherein the radial skew damper is positioned on a line extending from the fixed skew damper in the transport direction of the optical pickup.

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