KR200369857Y1 - Stepping motor for an optical pick-up transfer apparstus - Google Patents

Abstract

Disclosed are a stepping motor for an optical pickup transfer device, particularly a stepping motor having a simple structure and a stable structure. The disclosed stepping motor includes a motor housing in which a stator is coupled to an inner circumferential surface, a lead screw in which a rotor disposed to maintain a proper gap inside the stator is pressed into one end, and attached to an inner side of one side of the motor housing to drive the motor. Preload forming and centering member for maintaining the center of the lead screw and at the same time to form a preload. The preload forming and centering member is provided with a ring body, a hemispherical centering portion disposed at the center of the ring body and accommodating an end portion of the lead screw, and connected to the centering portion and the ring body so that the centering portion is elastically supported in one direction with respect to the ring body. It consists of elastic ribs of several spherical structures. According to this, since the centering and the preload formation of the stepping motor are made by one single member, the structure can be simplified. In addition, since expensive oilless bearings can be eliminated as in the prior art, material cost can be reduced, and since there are no parts to be worn even at high speeds and for long-term use, high reliability can be maintained as it is. It can be used stably in the optical pickup transfer device of the disc drive.

Description

Stepping motor for an optical pick-up transfer apparstus

The present invention relates to a stepping motor used in an optical pickup drive device for an optical disk drive, and more particularly, to an optical pickup drive device that can be used stably in an optical pickup drive device for a high speed optical disc drive because its structure is simple and structurally stable. It relates to a stepping motor.

In the optical disk drive, the optical pickup transfer device serves to transfer the optical pickup in the radial direction of the rotating disk seated on the turntable of the spindle motor.

As shown in FIG. 1, the optical pickup transfer device as described above includes a pair of guide shafts 3 and 3 ′ supporting the optical pickup 1 to be movable on the deck base 2, and the one side guide. A stepping motor 5 having a lead screw 4 arranged in parallel with the shaft 3 and interposed between the lead screw 4 and the optical pickup 1 along the lead screw 4. And a slider 6 for conveying. Here, one end of the slider 6 is provided with a gear portion engaged with the lead screw 4, and the other end is accommodated in the holder portion 1a of the optical pickup 1. Accordingly, the optical pickup 1 is moved along the pair of guide shafts 3 and 3 'with the movement of the slider 6. In the figure, reference numeral 7 is a fixing member, and 8 is a turntable.

As shown in FIGS. 2 and 3, the stepping motor 5 has a stator 12 coupled to an inner circumferential surface of the motor housing 11 and a lead screw having a proper gap inside the stator 12. One end of (4) includes a rotor 13 press-fitted.

The shaft hole 11a of the motor housing 11 is provided with an oilless metal bearing 14 as a centering member for maintaining its center when the lead screw 4 rotates. One end of the lead screw 4 is supported by the leaf spring 15 attached to the motor housing 11 to allow a slight flow in the longitudinal direction, and the other end thereof is fixed by the fixing member 7. It is rotatably supported by the deck base 2.

In this case, the leaf spring 15 forms a preload within a predetermined range in the lead screw 4 so that the lead screw 4 can rotate more smoothly in a structurally stable state. A ball 16 is interposed between the leaf spring 15 and the lead screw 4, and the lead screw 4 is provided with a groove 4a into which the ball 16 is inserted.

The stepping motor as described above is driven by a conventional motor driving principle, wherein the oilless metal bearing 14 and the leaf spring 15 are mechanically unstable elements, for example, which may inevitably occur in manufacturing. By accommodating the assembly error to some extent, the motor can be driven more stably. If the above structure is not adopted, the motor may not be driven smoothly when an error occurs. Therefore, the above-described centering member and preload forming member are necessarily employed in the motor used in the optical pickup drive of the optical disk drive.

However, in the stepping motor of the conventional optical pickup transfer apparatus as described above, since the members for centering the lead screw and forming the preload are separately formed, the number of components is increased, which causes a considerable difficulty in assembly. There was.

In addition, the conventional stepping motor has a problem that the material cost is increased by using an expensive oilless metal bearing as a centering member, and there is a problem of reliability in high speed long-term use due to wear of the oilless metal bearing, which is fatal at high speed. Can cause problems.

The present invention has been made in view of the above, and the object of the present invention is to provide a stepping motor for an optical pickup transfer device that can simplify the structure of the motor and improve cost reduction and assembly by reducing the number of components. have.

Another object of the present invention is to provide a stepping motor that can be stably used in an optical pickup transfer device of a high speed optical disk drive by maintaining high reliability even in high speed rotation and long-term use.

1 is a perspective view showing an optical pickup transfer device of a typical optical disk drive.

Figure 2 is an exploded perspective view showing the structure of a conventional stepping motor.

3 is a cross-sectional view of the assembled state of FIG.

Figure 4 is an exploded perspective view showing a stepping motor for an optical pickup transfer device according to the present invention.

5 is a cross-sectional view of the assembled state of FIG.

6 and 6 are a plan view and a cross-sectional view showing the structure of the preload forming and the centering member that is the main part of the present invention.

Explanation of symbols on the main parts of the drawings

1; optical pickup 2; deck base

3,3 '; guide shaft 4; lead screw

11; motor housing 12; stator

13; rotor 16; ball

20; preload and centering member 21; ring body

22; centering portion 23; elastic rib

The stepping motor of the optical pickup transfer apparatus according to the present invention for achieving the above object, the motor housing is coupled to the stator on the inner peripheral surface, and the rotor is arranged to maintain a suitable gap in the inside of the stator is press-fitted in one end And a preload forming and centering member attached to an inner side of one side of the motor housing to maintain a center of the lead screw while driving the motor and to form a preload.

The preload forming and centering member is provided with a ring body, a hemispherical centering portion disposed at the center of the ring body and accommodating an end portion of the lead screw, and connected to the centering portion and the ring body so that the centering portion is elastically supported in one direction with respect to the ring body. It consists of elastic ribs of several spherical structures.

In addition, a ball may be interposed between the lead screw and the centering part of the preloading and centering member.

According to this, since the centering and the preload formation of the stepping motor are made by one single member, the number of components thereof can be reduced as compared with the conventional one, and therefore the structure can be simplified.

In addition, since expensive oilless bearings can be eliminated as in the prior art, material cost can be reduced, and since there are no parts to be worn even at high speeds and for long-term use, high reliability can be maintained as it is. It can be used stably in the optical pickup transfer device of the disc drive.

The above objects and other advantages of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings.

4 is an exploded perspective view showing a stepping motor for an optical pickup transfer device according to the present invention, FIG. 5 is a cross-sectional view of the assembled state of FIG. 4, and FIGS. 6A and 6B illustrate a preload forming and centering member that is a main part of the present invention. A plan view and a cross-sectional view of the structure of FIG. For reference, in describing the embodiments of the present invention, the same reference numerals refer to the same parts as those in the prior art.

As shown, the stepping motor of the optical pickup transfer device according to the present invention includes a motor housing 11, a lead screw 4, and a preload forming and centering member 20.

The stator 12 is coupled to the inner circumferential surface of the motor housing 11, and the shaft hole 11a is formed at one side thereof.

One side of the lead screw 4 is rotatably accommodated in the motor housing 11 through the shaft hole 11a of the motor housing 11. One end of the lead screw 4 is coupled to the rotor 13 which is coaxially arranged while maintaining a proper gap with the stator 12.

The preload forming and centering member 20 is attached inside one side of the motor housing 11 and supports an end portion of the lead screw 4 accommodated in the motor housing 11. Specifically, the preload forming and centering member 20 includes an outermost ring body 21, a hemispherical centering unit 22 disposed in the center of the ring body 21, the centering unit 22, and the ring body. It is provided to connect 21 and consists of several elastic ribs of the spigot structure which elastically supports the centering part 22 with respect to the ring body 21 in one direction.

An end of the lead screw 4 is accommodated in the centering portion 22. Therefore, the center of the lead screw 4 can be accurately maintained. In addition, the elastic rib 23 elastically supports the centering portion 22 in which the lead screw 4 is accommodated in one direction so that the lead screw 4 can rotate with a certain amount of play. That is, to form a preload.

Meanwhile, a ball 16 may be interposed between the end portion of the lead screw 4 and the centering portion 22 of the preloading and centering member 20, and for this purpose, a groove ( 4a) is formed

As described above, the stepping motor according to the present invention is fixed and installed on one side of the deck base 2 by a bracket. At this time, the lead screw 4 is arranged in parallel with one side guide shaft 3 at an appropriate interval, and the end is supported on the deck base 2 rotatably by the fixing member (7).

The lead screw 4 of the stepping motor installed as described above is rotated by the driving of the motor, and the rotational force of the lead screw 4 is transmitted to the optical pickup 1 through the slider 6, whereby the optical pickup ( 1) is conveyed along the guide shafts 3 and 3 '. At this time, the lead screw 4 is rotated while maintaining its center accurately by the preload forming and centering member 20 according to the present invention installed to support the end, and in the front and rear direction within a certain error range It will be able to rotate stably while moving slightly.

As described above, according to the present invention, since the centering and the preload formation of the stepping motor are made by one single member, the number of components thereof can be reduced as compared with the conventional one, and therefore the structure can be simplified.

In addition, since expensive oilless bearings can be eliminated as in the prior art, material cost can be reduced, and since there are no parts to be worn even at high speeds and for long-term use, high reliability can be maintained as it is. It can be used stably in the optical pickup transfer device of the disc drive.

In the above has been shown and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the embodiment described above, it is common in the field to which the subject innovation belongs without departing from the gist of the subject innovation claimed in the claims below. Of course, any person skilled in the art can make various modifications, and such modifications fall within the scope of the claims.

Claims (3)

A motor housing having a stator coupled to an inner circumferential surface thereof; A lead screw press-fitted to one end of the rotor, the rotor being disposed to maintain an appropriate gap in the stator; And And a preload forming and centering member attached to an inner side of the motor housing to maintain a center of the lead screw when the motor is driven and to form a preload. 2. The preload forming and centering member according to claim 1, wherein the preload forming and centering member is provided with a ring body, a hemispherical centering portion disposed at the center of the ring body and accommodating an end portion of the lead screw, and the centering portion and the ring body being connected to each other. Stepping motor for an optical pickup transfer device, characterized in that made of elastic ribs of several spiral structures to support elastically in one direction. 3. The stepping motor of claim 2, wherein a groove is formed at an end of the lead screw, and a ball is interposed between the groove and the centering portion of the preloading and centering member.