KR100213074B1 - Diskdrive having improved pickup ass'y and the guide - Google Patents

Abstract

Disclosed is a pickup assembly for guiding a pickup assembly installed in a disk drive in a radial direction of a turntable, and a disk drive having an improved guide apparatus thereof. The disc drive includes a turntable fixed to a spindle motor installed in a base frame, a pickup assembly to which an objective lens for irradiating and receiving a laser beam onto a disk rotated and mounted on the turntable is fixed, and the pickup assembly has a radius of the disc. And moving means for moving in the direction and focusing direction, and the guide means for guiding the pickup assembly to be moved in the radial direction of the disk by the moving means. The present invention characterized by such a component is a simple pickup assembly structure, can reduce the weight of the pickup assembly, it is possible to move the pickup assembly quickly and precisely to reduce the information retrieval time.

Description

Disk drive having improved pickup ass'y and the guide}

The present invention relates to a disc drive using a disc as a recording medium, and more particularly, to a pickup assembly for guiding a pickup assembly installed in the disc drive in a radial direction of a turntable, and an improved disc drive thereof.

Generally, a disc drive or disc play includes a laser disc player (LDP) using a laser disc (LD), a compact disc player (CDP) using a compact disc (CD), and a magneto-optical disc drive using a magneto-optical disc (MOD). (MODD) and the like. The disk drive is provided with a pickup assembly and a pickup transport apparatus.

The pickup assembly is used to record or reproduce data by irradiating a light beam onto the disk rotating on the turntable, and the pickup transport apparatus serves to transport the pickup assembly in the radial direction of the disk rotating on the turntable. Since the pickup assembly records or reproduces data by irradiating light beams onto a track of disks sequentially formed in the radial direction, the pickup transport apparatus must move the pickup assembly as quickly and accurately as possible in the radial direction of the disk.

In order to move the pickup assembly quickly and accurately in the radial direction of the disc, the pickup assembly should be light, and the stick-slip generated between the pickup assembly and the pickup guide shaft should be minimized. As is well known, if a stick slip occurs between the pickup assembly and the pickup guide shaft, the pickup assembly does not move precisely.

1 is a perspective view showing a main part of a disk drive in which a pickup assembly and a guide apparatus according to the related art are installed. As shown, the spindle motor 2, the first and second guide shafts 3 and 4, and the pickup drive coil motor 5 are fixed to the base frame 1.

A turntable 7 is installed on the shaft of the spindle motor 2, and a disk (not shown) seated on the turntable 7 is rotated by the spindle motor 2. The first and second guide shafts 3 and 4 are fixed to the base 1 by the bush 8, and the pickup assembly 9 is attached to the first and second guide shafts 3 and 4 of the turntable 7. It is installed to move in the radial direction.

Coils 10 are provided at both ends of the pickup assembly 9, and a yoke 12 having a magnet 11 fixed thereto is installed at the base frame 1 facing the coil 10. Thus, the pickup assembly 9 may be moved in the radial direction of the turntable 7 by the coil 10 and the magnet 11.

As shown in FIG. 2, an actuator 14 provided with a tracking coil 18 and a focusing coil 19 is installed in the pickup assembly 9 to move the objective lens 13 in a focusing direction and a tracking direction. In the body 15 corresponding to the tracking coil 18 and the focusing coil 19, a pickup yoke 17 to which a pickup magnet 16 is fixed is provided.

The tracking coil 18 works together with the pickup magnet 16 to move the objective lens 13 in the tracking direction, and the focusing coil 19 works together with the pickup magnet 16 to focus the objective lens 13 in the focusing direction. Move to.

1 and 2, the movement for tracking the track of the pickup assembly 9 is obtained by two moving means. That is, the fine movement of the pickup assembly (when looking for a track within about 0.5 mm or less) is obtained by the movement of the objective lens 13 moved by the tracking coil 18 and the pickup magnet 16. Movement is obtained by movement of the entire pickup assembly which is moved by the coil 10 and the magnet 11.

Disc drive according to the related art having the pickup assembly and the guide device as described above has the following problems. When the pickup assembly is used to form a track on a disc or to move the pickup assembly for reproducing information from the formed track, the pickup assembly is made by two moving means, which is complicated in structure, heavy in weight, and quick to pick up the pickup assembly. There is a problem that is difficult to move. In addition, when assembling the pickup assembly and the body, it is difficult to assemble because it must be properly assembled in consideration of the relative movement between the parts.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk drive having an improved pickup assembly and a guide device thereof capable of quickly and precisely moving the pickup assembly in the radial direction of the disk.

1 is a perspective view of a main portion of a disk drive having a conventional pickup assembly and a guide device thereof.

FIG. 2 is a perspective view illustrating the inside of the pickup assembly shown in FIG. 1. FIG.

Figure 3 is a perspective view showing the main part of the disk drive improved pickup assembly and its guide device according to the present invention.

Figure 4 is a perspective view showing the main parts of another embodiment according to the present invention.

Figure 5 is a perspective view showing the main parts of another embodiment according to the present invention.

6 is a perspective view showing another example of a rotating means that can be employed in the embodiments shown in FIGS. 3, 4, and 5.

Explanation of symbols for the main parts of the drawings

1 ... base frame 2 ... spindle motor

7.turntable 100 ... pickup assembly

101.Object Land 102.

110 Pickup driven coil motor 111 York

112.Magnet 113.Tracking coil

114 ... Focusing coil 131 ... First guide shaft

132 2nd guide shaft 133 Bush

134 Moving Vehicle 140 Driving Motor

142 ... belt 150 ... elastomer

The disk drive with improved pickup assembly and guide device according to the present invention comprises: a turntable fixed to a spindle motor mounted to a base frame, and an object lens for irradiating and receiving a laser beam onto a disk mounted and rotated on the turntable. A pickup assembly, moving means for moving the pickup assembly in a radial direction and a focusing direction of the disc, and guide means for guiding the pickup assembly to be moved in the radial direction of the disc by the moving means. It is done.

The moving means may include a focusing coil and a tracking coil fixed to the pickup assembly, and a yoke having a magnet installed to correspond to the focusing coil and the tracking coil.

The guide means includes two guide shafts installed up and down in the radial direction of the disk, a bush for fixing each end of the guide shaft to the base frame, and a movable body installed on the guide shaft and moved along the guide shaft. And an elastic body having one end fixed to the movable body and the other end fixed to the pickup assembly to support the pickup assembly to move in a focusing direction.

In addition, the movable body of the present invention is preferably moved in the radial direction of the disk between the magnet and the tracking coil.

In addition, the present invention preferably further comprises a rotating means for rotating the two guide shafts.

The guide means of the present invention includes two guide shafts installed through the long holes formed in the pickup assembly in the radial direction of the disk, and a bush for rotatably fixing each end of the guide shaft to the base frame. It is desirable to.

The present invention characterized by such a component is a simple pickup assembly structure, can reduce the weight of the pickup assembly, it is possible to move the pickup assembly quickly and precisely to reduce the information retrieval time.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the disk drive improved pickup assembly and its guide device according to the present invention.

Figure 3 is a perspective view showing the main part of the disk drive improved pickup assembly and its guide device according to the present invention. As shown, the base frame 1 includes a spindle motor 2, first and second guide shafts 131 and 132, a yoke 111 of the pickup driving coil motor 110, and a guide shaft rotating means. Is installed.

The first and second guide shafts 131 and 132 are fixed to the base frame 1 by the bush 133 so as to be rotatable, and the movable bodies 134 are attached to the first and second guide shafts 131 and 132. Guided by the two guide shafts (131, 132) is installed to move in the radial direction of the turntable (7). In the present invention, the first and second guide shafts 131 and 132 are preferably installed side by side in the vertical direction.

The pickup driving coil motor 110 includes a focusing coil 114 and a tracking coil 113 fixed to both sides of the pickup assembly 100, and a magnet installed in the base frame 1 so as to face the coils 114 and 113. 112 includes a fixed yoke 111. Therefore, the pickup assembly 100 may be moved in the tracking direction and the focusing direction by the coils 114 and 113 and the magnet 112.

One end of the elastic body 150 is fixed to the movable body 134, and the other end of the elastic body 150 is fixed to the pickup assembly 100. Therefore, the pickup assembly 100 may be safely moved by the support of the elastic body 150 in the tracking direction and the focusing direction.

Since the objective lens 101 is fixed to the pickup assembly 100 used in the present invention, the entire pickup assembly 100 is moved in the tracking direction and the focusing direction by the pickup driving coil motor 110. Such pick-up assembly 100 according to the present invention has no relative movement between the parts installed therein, there is no failure, it is convenient to assemble.

As shown in FIG. 3, the rotation means may include a driving motor 140 in which a pulley is installed, a pulley installed in the first and second guide shafts 131 and 132, and a belt 142 connecting the pulleys. have.

The rotating means including such a component rotates the first and second guide shafts 131 and 132 with the driving force of the driving motor 140 so that the pickup assembly 100 is turned by the pickup driving coil motor 110. Minimizes the stick slip that occurs between the moving body 134 and the first and second guide shafts (131, 132) when moved in the radial direction. Therefore, the pickup assembly 100 moved by the pickup driving coil motor 110 can be moved in the radial direction (tracking direction) of the turntable 7 quickly and accurately.

On the other hand, when operating in a horizontal state, the pickup assembly 100 is in a floating state in the air, the friction force acting on the guide shafts (131, 132) is generated only by the weight of the movable body 134 and the elastic deformation of the elastic body (150). Therefore, the stick slip phenomenon is greatly reduced as compared with the related art even when the guide shafts 131 and 132 are not rotated, and more precise control is possible.

As shown in FIG. 3, the movable body 134 may be installed outside the yoke 111. However, as shown in FIG. 4, the movable body 134 may be installed in a space in which the focusing coil 114 is disposed. As shown in FIG. 3, the pickup assembly may be installed closer to the center of the pickup assembly.

The length of the elastic body 150 may be arbitrarily changed in consideration of the movement characteristics of the pickup assembly 100 and the installation position of the movable body 134. For example, since the movable body 134 shown in FIG. 4 is positioned between the focusing coil 114 and the magnet 111, the elastic body 150 does not secure its length when the elastic body 150 is installed linearly. (150) was bent and installed to secure its length.

Figure 5 is a perspective view showing the main parts of another embodiment according to the present invention. Referring to FIG. 5, a long hole 102 is formed in the pickup assembly 100, and first and second guide shafts 131 and 132 are inserted into the long hole 102. The long hole 102 is for excluding the interference of the guide shafts 131 'and 132' when the pickup assembly 100 is moved in the focusing direction by the pickup driving coil motor 110, and is moved in the tracking direction. This is to ensure proper guidance. As such, when the first and second guide shafts 131 ′ and 132 ′ are directly installed in the pickup assembly 100, the above-mentioned elastic body does not need to be installed.

The rotating means is not necessarily limited to the configuration shown in FIG. 3, and a rotating means having the configuration as shown in FIG. 6 may be employed.

The rotating means shown in FIG. 6 includes a drive motor 140 'provided with a pulley 140a, worm wheels 131a and 132a installed on the first and second guide shafts 131 and 132, and worm wheels 131a and 132a, respectively. Worm 135b and 135c coupled to each other are installed, and a worm shaft 135 rotatably installed on the base frame 1, a pulley 135a fixed to the worm shaft 135, and the pulleys 135a and 140a. It is configured to include a belt (142 ') for connecting. Even when using such a rotation means, when the drive motor 140 'is operated, a pair of fixed to the worm shaft 135 and its worm shaft 135 through the belt 142' and pulleys (135a, 140a) The first and second guide shafts 131 and 132 may be rotated by the worms 135b and 135c and the worm wheels 131a and 132a engaged with the respective worms 135b and 135c.

As described above, as the objective lens installed in the pickup assembly is fixedly installed, there are advantages as follows.

First, there is no failure because there is no relative movement between the components installed inside the pickup assembly, it is convenient to install the pickup assembly.

Second, since the pickup assembly has a simple structure, the overall weight can be reduced and it is easy to miniaturize.

Third, since only the pickup driving coil motor is operated, the control circuit is simple, and the pickup assembly can be accurately and quickly moved in the focusing and tracking directions.

Claims (11)

A turntable fixed to the spindle motor installed in the base frame, A pickup assembly to which an objective lens for irradiating and receiving a laser beam onto a disk rotated and mounted on the turntable is fixed; Moving means for moving the pickup assembly in a radial direction and a focusing direction of the disc; And a guide means for guiding the pickup assembly to be moved in the radial direction of the disk by the moving means. The method of claim 1, The moving means includes a focusing coil and a tracking coil fixed to the pickup assembly, and a yoke fixed to a magnet installed to correspond to the focusing coil and the tracking coil. Disk Drive. The method according to claim 1 or 2, The guide means includes two guide shafts installed up and down in the radial direction of the disk, a bush for fixing each end of the guide shaft to the base frame, a movable body installed on the guide shaft and moved along the guide shaft; And an elastic body having one end fixed to the movable body and the other end fixed to the pickup assembly to support the pickup assembly to be moved in a focusing direction or a radial direction. The method of claim 3, And the movable body is moved in the radial direction of the disk between the magnet and the tracking coil. The method of claim 3, And a bush for rotatably fixing each end of the guide shaft to the base frame, and a rotating means for rotating the guide shaft, wherein the pickup assembly and the guide device are improved. The method of claim 5, The rotating means is a disk drive with improved pickup assembly and its guide device, characterized in that each having a pulley installed on the guide shaft, a motor provided with the pulley, and a belt connecting the pulleys. The method of claim 5, The rotating means includes a drive motor having a pulley installed, a worm wheel installed on the first and second guide shafts, a worm screwed to the worm wheel and rotatably installed on the base frame, and fixed to the worm shaft. And a pulley and a belt connecting the pulleys, wherein the pickup assembly and the guide device are improved. The method according to claim 1 or 2, And the guide means includes two guide shafts installed through the long holes formed in the pickup assembly in the radial direction of the disk, and a bush for fixing each end of the guide shaft to the base frame. Disk drive with improved guidance. The method of claim 8, And a rotation means for rotating and rotating the two guide shafts, wherein the pickup assembly and the guide device are improved. The method of claim 9, The rotating means is a disk drive with improved pickup assembly and its guide device, characterized in that each having a pulley installed on the guide shaft, a motor provided with the pulley, and a belt connecting the pulleys. The method of claim 10, The rotating means includes a drive motor having a pulley installed, a worm wheel installed on the first and second guide shafts, a worm screwed to the worm wheel and rotatably installed on the base frame, and fixed to the worm shaft. And a pulley and a belt connecting the pulleys, wherein the pickup assembly and the guide device are improved.