KR20080042362A - Pick-up base assembly for disk drive - Google Patents

Abstract

A pickup base assembly for a disk drive is provided to reduce the length of a pickup base by minimizing configuration of transmitting driving force to an optical pickup. A pickup base assembly for a disk drive comprises a pickup base(30), a spindle motor(36), a pickup motor(42), a holder gear(50), a holder bar(52), and an optical pickup(54). The spindle motor installed at the front end of the pickup base rotates a turn table wherein a disk is mounted. The pickup motor mounted on one side of the pickup base provides a driving force. The holder gear rotated on the pickup base is rotated by receiving the driving force of the pickup motor. The holder bar is integrated with the holder gear. The optical pickup, which is placed at the front end of the holder bar, spirally moves between the innermost periphery and the outermost periphery of the disk, records a signal on a disk, and reproduces the recorded signal. The pickup base has a pickup window(31) where the optical pickup is positioned to form the circle track.

Description

Pick-up base assembly for disk drive

1 is a plan view showing the configuration of a pickup base assembly of a disk drive according to the prior art.

Figure 2 is a plan view showing the configuration of a preferred embodiment of the pickup base assembly of the disc drive according to the present invention.

Figure 3 is a side view showing the configuration of an embodiment of the present invention.

4 is an operational state diagram showing that the optical pickup is in a position corresponding to the innermost circumference of the disk in the embodiment of the present invention.

5 is an operational state diagram showing that the optical pickup is in a position corresponding to the outermost circumference of the disk in the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

30: pickup base 31: pickup window

32: connection installation portion 33: installation hole

34: motor mounting plate 36: spindle motor

38: turntable 40: motor seat

42: pickup motor 43: motor shaft

45: worm gear 47: middle gear

48: Helical Gear 49: Spur Gear

50: holder gear 52: holder bar

54: optical pickup 56: objective lens

D: disc

The present invention relates to a disc drive, and more particularly to a pickup base assembly of a disc drive having a configuration for rotating the disc and a configuration for recording and playing back signals on the disc.

1 is a plan view showing a configuration of a pickup base assembly of a disc drive according to the prior art. According to this, the pick-up base 1 is installed on the main base so that the tip is liftable about the rear end thereof. Through the pick-up base 1, the pick-up window 3 is formed long before and after.

The spindle motor 5 is installed at the front end side of the pickup base 1, and the turntable 7 is provided on the rotation shaft of the spindle motor 5. On the turntable 7 a disk is seated. The disk seated on the turntable 7 is rotated integrally with the turntable 7.

Along the edge of the pickup window 3, the main guide shaft 9 is installed long in the front-rear direction of the pickup base 1. The main guide shaft 9 is a portion for movably supporting one end of the optical pickup 10 to be described below. The main guide shaft 9 penetrates through one side of the optical pickup 10.

The additional guide portion 9 'is formed along the other edge of the pickup window 3 in parallel with the main guide shaft 9. The additional guide portion 9 'is formed integrally with the pickup base 1 as a mold. The additional guide portion 9 ′ movably supports the other end of the optical pickup.

The pickup window 3 is provided with an optical pickup 10 supported at both ends by the main guide shaft 9 and the additional guide portion 9 '. The optical pickup 10 has a pickup lens 11 on an upper surface thereof.

Feed guide 15 is installed on one side of the optical pickup (10). The feed guide 15 is a portion that receives the power for the movement of the optical pickup (10). The feed guide 15 is installed to have a predetermined clearance with the surface of the pickup base 1. A rack gear part 16 is formed along one side of the feed guide 15.

The power for the movement of the optical pickup 10 is provided by a sled motor 18. The sled motor 18 is installed on one side of the pickup base 1. Power of the sled motor 18 is transmitted to the feed guide 15 through the gear train 19.

However, the pickup base assembly according to the prior art as described above has the following problems.

First, in the conventional pickup base assembly, there is a problem that the front and rear length of the pickup base 1 is relatively long. This is because the optical pickup 10 is configured to linearly move in the radial direction of the disk seated on the turntable 7. That is, the main guide shaft 9 should be installed long in the front and rear direction of the pickup base 1 for the linear reciprocating motion of the optical pickup 10, and the power for the movement of the optical pickup 10 should be transmitted. The size fisherman 16 should have at least as long as the movement stroke of the optical pickup 10.

In addition, the rack gear unit 16 that receives the power for the movement of the optical pickup 10 has the last end of the gear train 19 at one end when the optical pickup 10 is closest to the turntable 7. It meshes with the gear, so that the optical pickup 10 should not protrude from the pickup base 1 even when the optical pickup 10 is farthest from the turntable 7, so that the length of the front and rear directions of the pickup base 1 is long. .

As described above, when the length of the front and rear directions of the pickup base 1 becomes long, there is a problem in that a disk drive cannot be applied to a wall-mounted television or an audio system configured to minimize the length of the front and rear directions recently.

In addition, as described above, in order for the optical pickup 10 to linearly move, a gear train 19 including a plurality of gears, a main guide shaft 9 and an additional guide part for guiding the movement of the optical pickup 10 are provided. (9 ') and so on. Therefore, there is also a problem in that the number of parts constituting the pickup base assembly is relatively large.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, and to relatively reduce the length of the front and rear direction of the pickup base.

Another object of the present invention is to minimize the components for driving the optical pickup in the pickup base.

According to a feature of the present invention for achieving the above object, the present invention is a pickup motor, a spindle motor installed on the tip side of the pickup base to rotate the turntable on which the disk is seated, and one side of the pickup base A pick-up motor seated and providing forward and reverse driving force, a holder gear rotatably installed on the pick-up base by rotating by receiving the driving force of the pick-up motor, a holder bar rotated integrally with the holder gear, and the holder It is installed at the tip of the bar and comprises an optical pickup that moves between the innermost and outermost circumferences of the disc while drawing a circular trajectory, records signals on the disc, and reproduces the recorded signals.

The holder bar is adapted to coincide with the holder gear and its center of rotation.

A worm gear is formed on the motor shaft of the pickup motor, and an intermediate gear is installed between the worm gear and the holder gear. The intermediate gear is a helical gear part engaged with the worm gear and a spur gear that is engaged with the holder gear. Fishermen are provided together.

According to another feature of the present invention, the present invention provides a pick-up base, a spindle motor installed on the tip side of the pick-up base to rotate a turntable on which a disc is seated, and mounted on one side of the pick-up base to provide forward and reverse driving force. And a pickup, and an optical pickup for recording a signal on the disk and reproducing the recorded signal while moving between the innermost and outermost circumferences of the disk while drawing a circular locus with the driving force of the pickup motor.

The center of rotation of the optical pickup coincides with the center of rotation of the final gear that transmits the driving force of the pickup motor.

The optical pickup is installed in a holder bar which rotates integrally with the final gear.

The center of rotation of the holder bar coincides with the center of rotation of the final gear.

The pick-up base is provided with a pick-up window in which the optical pickup is positioned and moved to form a circular trajectory.

A motor seating part protrudes from one side of the pickup base, and the pickup motor is seated on the motor seating part.

In the pickup base assembly of the disc drive according to the present invention having such a configuration, the length of the front and rear directions of the pickup base can be relatively reduced, so that the length of the front and rear directions of the disc drive can be minimized, thereby making it possible to slim the product in which the disc drive is adopted. In addition, since the number of parts for driving the optical pickup in the disk drive is minimized, there is an advantage of reducing the manufacturing cost of the disk drive.

Hereinafter, a preferred embodiment of a pickup base assembly of a disc drive according to the present invention will be described in detail with reference to the accompanying drawings.

2 shows a preferred embodiment of a pickup base assembly of a disc drive according to the invention in a plan view, and in FIG. 3 a configuration of the embodiment of the invention is shown in a side view.

As shown in these figures, the pick-up base 30 is in a substantially rectangular plate shape, which is close to a square in the present invention. The material of the pickup base 30 is made of synthetic resin, and is made through injection molding. A pickup window 31 is formed in the pickup base 30. The pickup window 31 is made of the same trajectory as the trajectory of the optical pickup 54 to be described below. That is, in the present invention, the pickup window 31 is formed to have a predetermined radius of curvature.

 Connection installation parts 32 are formed at four corners of the pickup base 30. An installation hole 33 is formed in the connection installation part 32 to be opened to one side, and the installation hole 33 is provided with a dustproof port (not shown). The pickup base 30 is installed on the main base (not shown) via a dustproof opening through the connection installation unit 32.

The spindle motor 36 mounted to the motor mounting plate 34 is installed at the tip of the pickup base 30. The motor mounting plate 34 is installed on the bottom surface of the pickup base 30 as shown in FIG. The spindle motor 36 is mounted on the upper surface of the motor mounting plate 34 to be exposed to the upper portion of the pickup base 30.

The turntable 38 is installed on the rotating shaft of the spindle motor 36. The turntable 38 is rotated by the spindle motor 36, the disk (D) is seated on the upper surface. The disk D is seated on the turntable 38 and rotated integrally with the turntable 38 by the spindle motor 36.

One side of the pickup base 30 is provided with a motor seating portion (40). The motor seat 40 is formed integrally with the pickup base 30 and protrudes downwardly and laterally from one end of the pickup base 30.

Pick-up motor 42 is installed on the motor seat 40. The pickup motor 42 is to provide power for driving the optical pickup 54 to be described below. The worm gear 45 is installed on the motor shaft 43 of the pickup motor 42. The worm gear 45 is rotated by the pickup motor 42.

An intermediate gear 47 is rotatably installed on the pickup base 30. The intermediate gear 47 is formed with a helical gear portion 48 engaged with the worm gear 45 around its edge. The intermediate gear 47 is also formed with a spur gear 49 that is relatively smaller in diameter than the helical gear 48. The spur gear portion 49 is engaged with the holder gear 50 to be described below.

The holder gear 50 is rotatably installed in the pickup base 30. The holder gear 50 is meshed with the spur gear portion 49 of the intermediate gear 47. The holder gear 52 is installed on the holder gear 50. The holder bar 52 is fixed to the holder gear 50 so that itself or its extension line passes through the center of rotation of the holder gear 50. Accordingly, the holder bar 52 has its center of rotation coincident with the holder gear 50.

An optical pickup 54 is installed at the tip of the holder bar 52. The optical pickup 54 irradiates light from a light source and uses the light to irradiate a disk, which is a recording medium, to record information or to reproduce the recorded information. Reference numeral 56 is an objective lens for condensing light on the disk.

Since the optical pickup 54 is fixed to the holder bar 52, the holder bar 52 is rotated together by being rotated by the holder gear 50. Thus, the trajectory of the optical pickup 54 is a circular trajectory having a predetermined radius. That is, it is a circular locus having a predetermined radius around the center of rotation of the holder gear 50. The optical pickup 54 actually moves along the circular trajectory formed by the pickup window 31 between the innermost and outermost circumferences of the disk D seated on the turntable 38.

Hereinafter, the operation of the pickup base assembly of the disc drive according to the present invention having the configuration as described above will be described in detail.

The tip of the pickup base 30 is installed so that the tip of the spindle motor 36 is installed on the main base so as to be liftable, and the tip of the pickup base 30 is relatively lowered before the disc D is loaded. When the disk D is loaded, the disk D is seated on the turntable 38 while the tip of the pickup base 30 is raised at the end of the loading operation. The disk D seated on the turntable 38 may be fixed to the turntable 38 by a separate clamp (not shown).

When the disk D is seated on the turntable 38, the spindle motor 36 rotates to allow the turntable 36 and the disk D to rotate together. As the disk D rotates and the optical pickup 54 moves in a circular trajectory along the pickup window 31, light is transmitted through the objective lens 56 at a desired position of the disk D. You can investigate. In this manner, the optical pickup 54 can irradiate the disc D with light to record a signal or to reproduce the recorded signal.

Here, it will be described that the optical pickup 54 moves while drawing a circular trajectory. When the pickup motor 42 mounted on the motor seat 40 is driven, the motor shaft 43 of the pickup motor 42 rotates. When the motor shaft 43 rotates, the worm gear 45 meshes with the helical gear portion 48 of the intermediate gear 47 to rotate the intermediate gear 47.

When the intermediate gear 47 is rotated, the holder gear 50 meshed with the spur gear 49 of the intermediate gear 47 rotates. Rotation of the holder gear 50 produces a rotation of the holder bar 52, and rotation of the holder bar 52 produces a rotation of the optical pickup 54. Therefore, the optical pickup 54 is moved by drawing the circular trajectory in both directions between the outermost and innermost circumferences of the disc D by the forward and reverse rotation of the pickup motor 42.

Here, the optical pickup 54 is shown at a position corresponding to the innermost circumference of the disc, and the optical pickup 54 is shown at a position corresponding to the outermost circumference of the disc. .

For reference, the optical pickup 54 is configured to move while drawing a circular trajectory by a predetermined angle (about 60 degrees) by the rotation of the holder gear 50, and the holder gear 50 is picked up by the pickup base 30. Power is transmitted through the worm gear 45 and the intermediate gear 47 driven by the pickup motor 42 in a state rotatably installed in the).

Therefore, since the optical pickup 54 is moved only by the rotation of the holder bar 52 in the movement between the innermost and outermost circumference of the disk D, the optical pickup 54 is configured for the movement of the optical pickup 54. This space is minimized.

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

For example, the holder bar 52 does not have to be installed between the optical pickup 54 and the holder gear 50, but the center of rotation of the holder gear 50 and the optical pickup 54. If the center of rotation can match, one side of the optical pickup 54 to the holder gear 50 to transfer the driving force of the holder gear 50 directly to the optical pickup 54 without having the holder bar 52 in the middle. It may be installed.

In the pickup base assembly of the disc drive according to the present invention as described in detail above, the following effects can be obtained.

First, in the present invention, the optical pickup is moved while drawing a circular trajectory by a holder gear rotatably installed on the pickup base. Therefore, since the space occupied by the configuration for transmitting power for the movement of the optical pickup to the optical pickup is minimized, it is possible to minimize the size of the pickup base, particularly the length before and after. Thus, if the front and rear length of the pickup base is shortened, there is an effect that the front and rear length of the product in which the disk drive is used can be shortened.

In the present invention, a holder bar rotated by a holder gear is used to move the optical pickup while drawing a circular trajectory. Therefore, in the present invention, since the optical pickup is supported and moved to one holder bar, the configuration for guiding the movement of the optical pickup is simplified. Of course, the number of gears used in the process of transferring the driving force of the pickup motor to the optical pickup can be relatively reduced. Therefore, in the present invention, since the number of parts for driving the optical pickup is minimized, the manufacturing cost of the disk drive can be reduced.

Claims (11)

With pickup base, A spindle motor installed at the front end side of the pickup base to rotate a turntable on which a disk is seated; A pickup motor seated on one side of the pickup base to provide forward and reverse driving force; A holder gear rotatably installed on the pickup base by rotating by receiving the driving force of the pickup motor; A holder bar which is integrally rotated with the holder gear, An optical pickup installed at the tip of the holder bar to move between the innermost and outermost circumferences of the disk, drawing a circular trajectory, recording a signal on the disk, and reproducing the recorded signal. Base assembly. The pickup base assembly of claim 1, wherein the pickup base includes a pickup window to which the optical pickup is positioned and moved so as to form a circular trajectory. The pickup base assembly of claim 2, wherein a motor seating part protrudes from one side of the pickup base, and the pickup motor is seated on the motor seating part. 4. The pickup base assembly of claim 1, wherein the holder bar is made to coincide with the holder gear and its center of rotation. The worm gear of claim 4, wherein a worm gear is formed on a motor shaft of the pickup motor, and an intermediate gear is installed between the worm gear and the holder gear, and the helical gear part meshed with the worm gear is formed on the intermediate gear. A pickup base assembly of a disc drive, characterized in that a spur gear portion engaged with the holder gear is provided together. With pickup base, A spindle motor installed at the front end side of the pickup base to rotate a turntable on which a disk is seated; A pickup motor seated on one side of the pickup base to provide forward and reverse driving force; Pick-up base assembly of the disc drive comprising an optical pickup to move between the inner and outer circumference of the disc while drawing the circular locus with the driving force of the pickup motor to record a signal on the disc and to reproduce the recorded signal . 7. The pickup base assembly of claim 6, wherein the center of rotation of the optical pickup coincides with the center of rotation of the final gear transmitting the driving force of the pickup motor. 8. The pickup base assembly of claim 7, wherein the optical pickup is installed in a holder bar which rotates integrally with the final gear. The pickup base assembly of claim 8, wherein the center of rotation of the holder bar and the center of rotation of the final gear coincide. 10. The pickup base assembly of claim 9, wherein the pickup base includes a pickup window in which the optical pickup is positioned and moved to form a circular trajectory. The pickup base assembly of claim 10, wherein a motor seating part protrudes from one side of the pickup base, and the pickup motor is seated on the motor seating part.

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