KR20010084270A - Optical disk drive having apparatus for moving optical pickup - Google Patents

Abstract

PURPOSE: An optical pickup transporting apparatus is provided to reduce a time period for an optical pickup to seek a track by using a rotary-type voice coil motor high in rotation speed and easy in control. CONSTITUTION: An optical disk drive(10) has a deck(12), an optical disk driver(14) arranged on the deck(12), an optical pickup(16), an optical pickup guide(18) and an optical pickup driver(19). An optical disk(D) is settled on a mount(24) in the deck(12) for rotating the disk(D). The optical pickup(16) reads or writes data in each track. A voice coil motor(50) in the optical pickup driver(19) is driven to move between tracks. When the voice coil motor(50) is applied with current, an arm(52) in the optical pickup driver(19) rotates about a rotary axis(64). A cam follower pin is rotated about the rotary axis(64). A driving force of the cam follower pin is transmitted to an optical pickup base of the optical pickup(16), and the optical pickup(16) is guided by a guide bar(40) of the optical pickup guide(18).

Description

Optical pickup drive and optical disc drive equipped with the transfer device {OPTICAL DISK DRIVE HAVING APPARATUS FOR MOVING OPTICAL PICKUP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc drive for a computer, and more particularly to an optical disc drive having a transfer device equipped with a voice coil motor in transferring an optical pickup for boat racking.

Optical discs (also called optical media) are used to record digital data in computer recording devices, audio devices, and video devices. For example, CD-ROM, CD-WORM, CD-RW, DVD, MODD, etc. are mentioned. These optical discs read data from or write data to the optical disc drive. The optical disc drive is provided with an optical pickup.

The laser pick-up device reads or writes data on a rotating optical medium, and generally fits the track while moving in the radial direction of the optical disc.

Various elements, components, and devices of the optical pickup are installed in the base. The base is mounted on two parallel guide bars. Conventional optical pickup driving apparatus (or optical pickup transfer apparatus) is provided with a rotary screw and a lead screw or rack gear for changing the rotational motion of the motor into a linear motion.

However, such a conventional optical pickup drive device has a low feed speed. Therefore, there is a disadvantage in that the seek speed of the track in which data is recorded is slow. In order to read or record signals of an increasingly high-capacity optical disk, the moving speed of the optical pickup must be increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to provide an optical disc drive equipped with an optical pickup transport apparatus which improves the speed of finding a track.

1 is a perspective view schematically showing an optical disk drive provided with an optical pickup transport apparatus according to an embodiment of the present invention, and schematically showing the transport apparatus well;

2 is an exploded perspective view of the optical disk drive of FIG.

3 is a plan view of the optical disk drive of FIG.

Figure 4 is a bottom view of the transport apparatus of the optical disk drive of Figure 1 seen from below

<Description of the symbols for the main parts of the drawings>

10: optical disc drive 12: deck

14 optical drive device 16 optical pickup

18: optical pickup guide device 19: optical pickup drive device

20: drive motor

The present invention for achieving the above object, in the optical disk drive for reading or writing data from a rotating optical disk,

Optical pickup with a base,

An optical pickup guide device for guiding a linear motion of the optical pickup;

An arm that rotates in a circular arc about an axis of rotation

It is provided with a rotary voice coil motor for driving the arm,

At least one of the base and the end of the arm is provided with a cam, the other is provided with an optical disk drive, characterized in that the cam follower is provided.

Hereinafter, an optical disk drive according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The optical disk drive 10 according to the embodiment of the present invention, as shown in Figures 1 to 3, the deck 12, the optical disk drive device 14, the optical pickup 16, the optical pickup 16, located on the deck A guide device 18 and an optical pickup drive device 19 are provided.

1 to 3, deck 12 typically has a length and a width. The optical disc drive device 14 on one side of the deck 12 is provided with a drive motor 20, a connecting shaft 22, and a disc mounting table 24. Rotation of the drive motor 20 is transmitted to the disk mounting 24 through the connecting shaft 22, the mounting 24 is rotated. The optical disk D is detachably attached to the disk mounting table 24. The disc drive device 14 including the structure of the disc mounting table 24 can use the same thing as a normal optical disc drive.

1 to 3, the optical pickup 16 is usually provided below the optical disc D, and generally reads data recorded in each track while moving in the radial direction, or records data in each track. The optical pickup 16 includes an actuator for supporting a light source, a photo diode, a beam splitter, a collimator lens, an objective lens, and an objective lens and finely adjusting the position. Is provided. In addition, a reflector for bending an optical signal to be perpendicular to the optical disk plane, a flexible PCB for sending an electric signal to a light source and an actuator or receiving an electric signal from a light receiving element and sending it to a circuit is provided. The optical pickup further includes a base 30. In the base 30 of the optical pickup, various electrical components, optical components, and mechanical driving components are installed on the base. The parts of these optical pickups are preferably dense.

The base 30 is generally made by die casting and machining of metallic materials. Alternatively, the engineering plastics material may be produced by injection molding. At one end of the base 30, a pair of first guide parts 32 protruding and extending in a direction perpendicular to the moving direction of the optical pickup is installed side by side. Guide holes 34 are formed in the first guide portion 32. The other end of the base 30 is also provided with a second guide portion 36 protruding and extending in a direction perpendicular to the moving direction of the optical pickup. The second guide portion 36 is provided with a guide groove 38 that has burst to one side.

The various components described above are mounted on the optical pickup 16 and the base 30. On the other side, that is, under the base 30, as shown in FIG. 4, the cam groove 31 is provided. The cam groove 31 is formed to extend generally long and vertically in a direction in which the optical pickup 16 moves. The cam groove 31 is preferably formed along a straight line passing through the center of gravity of the optical pickup.

As shown in FIGS. 1 to 3, the optical pickup guide device 18 has two guide bars 40 in parallel. The guide bar 40 is supported by the support 42 of both sides, respectively. Guide holes 34 and guide grooves 38 in the base 30 of the optical pickup 16 are fitted to the respective guide bars 40. The optical pickup 16 is guided by this guide bar 40 and moves in a straight line. The guide bar 40 is preferably inclined at about 45 degrees with respect to the longitudinal direction of the deck, since in such a structure the size of the entire optical disc drive can be minimized.

The optical pickup drive unit 19 includes a rotary voice coil motor 50 and an arm 52 connected thereto. The motor 50 has a lower yoke 54 and an upper yoke 56 fixed to the deck 12. These yokes are arcuate. A plurality of legs 58 are provided between them to fix them. Between the upper and lower yokes 54 and 56, an arc-shaped permanent magnet 60 and an annular coil 62 are sequentially located. The rotary voice coil motor 50 may be the same as that used in a normal HDD.

The annular coil 62 and the arm 52 are combined to be integral. The arm 52 is rotatably installed on the central axis 64 fixed to the deck 12. The arm 52 pivots about the central axis 64. A cam following pin 66 protruding upward is fixed to an end opposite to the end where the coil 62 is provided. This cam driven pin 66 is fitted to a cam groove 31 in the optical pickup base 30, as shown in FIG. Between the dimension of the width | variety of the cam groove 31, and the outer diameter of the cam follower pin 66, a dimension relationship is determined so that a sliding movement is possible. It is preferable to apply a lubricant to this cam groove 31.

1 and 4, the operation of the optical disk drive according to the embodiment of the present invention will be described. The optical disk D is mounted on the mounting table 24 to rotate the disk. The optical pickup 16 reads or records data for each track. On the other hand, when moving the track, the voice coil motor 50 is driven. When a current is applied to the coil coil motor 50, the arm 52 rotates about the rotation shaft 64. At this time, the cam follower pin 66 is also driven to rotate around the rotation shaft 64. The driving force of the cam driven pin 66 is transmitted to the optical pickup base 30, and the optical pickup 16 is moved while being guided by the guide bar 40. At this time, the cam driven pin 66 that moves in an arc moves in the cam groove 31 of the base 30 that moves linearly, and pushes the optical pickup 16.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. Those skilled in the art will appreciate that modifications and variations can be made without departing from the spirit and scope of the present invention and that such modifications and variations also fall within the present invention.

In the above embodiment, the cam groove has been described as being a straight line. Alternatively, the cam groove may be curved. Even a straight line may not be perpendicular to the optical pickup.

In the above embodiment, all parts of the optical pickup are described as being installed on the base. However, in order to minimize the weight of the driving unit during the optical pickup, only some parts are installed on the base 30 and some parts are installed elsewhere. For example, a laser diode, a photo diode unit and a structure therefor are installed outside the driving unit of the optical pickup (for example, on an arm close to the axis of rotation or on the axis of rotation). Only an objective lens, an actuator for supporting and finely adjusting the position of the objective lens and a beam splitter are installed on the base.

In the above embodiment, the cam has been described as the cam follower is installed in the arm to the optical pickup, alternatively, the cam may be installed in the arm to the cam follower.

The use of a rotary voice coil motor with high rotational speed and ease of control reduces the time for optical pickup to track. Therefore, it is possible to read and write data at high speed. The rotational rocking motion of the arm connected to the rotary voice coil motor is converted to the linear drive of the optical pickup so that it can be kept compatible with other optical disk devices. Since the elements driven to convert the rotational rocking motion into a linear motion are in a position close to the center of gravity of the optical pickup, a stable and well-controlled optical pickup conveying motion is ensured.

Claims (1)

An optical disc drive for reading or writing data from a rotating optical disc, Optical pickup with a base, An optical pickup guide device for guiding a linear motion of the optical pickup; An arm that rotates in a circular arc about an axis of rotation It is provided with a rotary voice coil motor for driving the arm, At least one of the base and the end of the arm is provided with a cam, the other is provided with a cam follower.