KR100638287B1 - Motor for driving optical disk - Google Patents

Abstract

Disclosed is a motor for driving an optical disc. According to the optical disk driving motor, since the metal bearing is pressed and fixed to the bush, the length to the disk and the upper end of the metal bearing is reduced. Therefore, a relatively equal load is applied to the upper end and the lower end of the shaft contacting the metal bearing, thereby preventing single wear of the metal bearing supporting the shaft.

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Description

Motor for optical disc drive{MOTOR FOR DRIVING OPTICAL DISK}

1 is a front sectional view showing the configuration of a general optical disc driving motor

Figure 2 is a front sectional view showing the configuration of a motor for driving an optical disc according to the present invention

<Explanation of reference numerals for major parts in drawings>

3: Shaft 5: Metal bearing

6: housing 11: rotor yoke
100: bush 110: recess
120: support 130: support

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The present invention relates to a motor for driving an optical disc, and more particularly, to an optical disc driving motor for reducing the difference in load applied to the upper and lower portions of the shaft to prevent generation of abrasion of a metal bearing in contact with the shaft. will be.

In general, optical discs such as CD, DVD-S, DVD-D, etc. have a diameter of several inches and a thin thickness of 1.2 mm, but their capacity is larger than that of a floppy disk, which is a magnetic recording medium with a capacity within 2 megabytes. It has the ability to store hundreds of megabytes of data, which is hundreds of times larger, and has a reflective surface that reflects light as a data recording layer, and provides information such as sound, text, graphics, etc. that are a combination of pits formed concavely on the reflective surface. As a storage medium to store, the development of an optical disc reproducing device for reading data stored at a very high density without errors and with high speed has been steadily progressed along with the development of a compact disc having such a large capacity.

In this optical disc reproducing apparatus, a motor for driving an optical disc for rotating an optical disc is used, as shown in FIG.

As shown in the front sectional view of FIG. 1, the motor for driving an optical disc is provided with a shaft 3 fixed on the base plate 1, a metal bearing 5 attached to the inside, and a metal bearing 5 The bearing housing (7) supporting the shaft (3), the rotor yoke (11) fixed by a cylindrical bush (Bush) (9) to the shaft (3), and installed inside the rotor yoke (11) It consists of a driving magnet 13 and a turn-table 15 mounted on the upper end of the shaft 3.

At this time, the shaft 3 is mutually coupled by a bush 9 mounted in the inner hole of the rotor yoke 11.

The operation of the optical disk driving motor having such a configuration will be described in detail with reference to FIG. 1 as follows.

When the shaft 3 including the rotor yoke 11 is rotated by the rotational force of the driving magnet 13 and the armature core 19, the turn coupled to the upper end of the shaft 3 by the bush 9 The table 15 is also linked together to rotate the optical disk 17.

Here, when the shaft 3 is rotated, loads of different sizes are applied to the upper portion A1 and the lower portion B1 of the shaft 3, and the loads applied to the upper portion A1 and the lower portion B1 of the shaft 3 are as follows It is calculated by the following equation.

Here, F1 is the load applied to the upper end (A1) of the shaft 3, F2 is the load applied to the lower end (B1) of the shaft 3, L1 is the distance between the optical disk 17 and the upper end of the metal bearing 5 , L2 is the distance between the optical disk 170 and the lower end of the metal bearing 5, m is the optical disk eccentricity, r is the shaft radius, ω is the angular velocity, and G is the gravitational acceleration. ), the load on the upper part (A1) and the lower part (B1) can be seen that F1 is always greater than F2, and the difference between the sizes of F1 and F2 is determined by L1.

However, in the conventional optical disk driving motor, the distance between the bush 9 and the upper end of the metal bearing 5 is inevitably increased because the metal bearing 5 is configured to be accommodated in the bearing housing 7. There is a problem in that a larger amount of load is applied to the upper end of the metal bearing 5 than the lower end of the metal bearing 5, so that the upper end of the metal bearing in contact with the shaft wears relatively quickly compared to the lower end.

The present invention is to solve the above problems, by reducing the distance between the disk and the upper end of the metal bearing supporting the rotation of the shaft, the optical disc drive motor that can prevent the occurrence of single wear in the metal bearing supporting the shaft In providing.

The optical disk drive motor of the present invention for achieving the above object is a base plate, a housing installed on the base plate, a shaft installed at a lower end side and rotatably installed on a portion of the base plate located inside the housing , Armature core fixed to the outer surface of the housing, bush coupled to the upper end side of the shaft exposed to the upper side of the housing, turntable and rotor yoke coupled to the bush, coupled to the rotor yoke and the armature core In the driving motor for an optical disc comprising an opposing drive magnet, a metal bearing for supporting the rotation of the shaft,
In the bush, a recess portion and a support portion extending downward from the recess portion are formed,
The metal bearing is press-fit fixed to the recess and the support,
The upper circumferential side and the central circumferential side of the shaft exposed to the upper side of the housing are supported by being in contact with the metal bearing,
The base plate is formed with a support hole through which the lower end of the shaft is press-fitted.

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Hereinafter, the configuration and operation of the optical disk driving motor according to the present invention will be described in detail with reference to FIG. 2. In FIG. 2, the same reference numerals as those in FIG. 1 are given to the same parts as the motor for driving the optical disc shown in FIG. 1, and description thereof is omitted.

2 is a front sectional view showing the configuration of a motor for driving an optical disc according to the present invention.

As shown in FIG. 2, the base plate 1 is provided with a housing 6 standing upright, and a lower end of the shaft 3 is press-fit fixed to the base plate 1 portion located inside the housing 6 The support hole 130 is formed.
And, the portion of the shaft 3 exposed to the upper side of the housing 6, that is, the central and side outer peripheral surfaces of the shaft 3 are supported by being in contact with the metal bearing 5, the metal bearing 5 is It is pressed into the bush 100 and fixed. That is, a recess 110 in which the metal bearing 5 is press-fit-fixed is formed at the center of the lower surface of the bush 100, and the recess 110 is formed so that the metal bearing 5 is firmly fixed to the recess 110. ), the support part 120 is extended.
The armature core 19 is fixed to the outer surface of the housing 6, and the turntable 15 and the rotor yoke 11 are fixed to the bush 100. In addition, a driving magnet 13 facing the armature core 19 is fixed to the inner surface of the rotor yoke 11.

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Hereinafter, the operation of the optical disk driving motor according to the present invention will be described in detail with reference to FIG. 2.

First, looking at the insertion process of the metal bearing 5, the metal bearing 5 is press-fit fixed to the recess 110 of the bush 100, and the shaft 3 is provided to the support hole 130 of the base plate 1 The press-fit is fixed.

In this state, the shaft 3 and the metal bearing 5 are coupled so that the shaft 3 is in contact with the metal bearing 5.

The rotor yoke by the rotational force of the driving magnet 13 and the armature core 19 while the metal bearing 5 is press-fit fixed to the bush 100 and the shaft 3 is fixed to the base plate 1. When the bush 100 including (11) rotates, the turn-table 15 coupled by the bush 9 is also interlocked to rotate the optical disk 17.

At this time, when the bush 100 is rotated, the metal bearing 5 press-fitted thereto rotates the outer periphery of the shaft 3 around the shaft 3.

Here, when the shaft 3 is rotated, loads of different sizes are applied to the upper portion A2 and the central portion B2 of the shaft 3 in contact with the metal bearing 5, and the upper portion A2 of the shaft 3 The load applied to the central portion B2 is determined by Equation 1 above. In the present invention, the length of the optical disc 17 and the upper end (A1) of the metal bearing (5) by pressing and fixing the metal bearing (5) to the bush (100), that is, L1 is formed very short, the upper end of the shaft (3) ( A2) and the central portion (B2) have a similar load.

Therefore, a similar size load is applied to the upper and lower parts of the metal bearing 5 contacting the upper part A2 and the central part B2 of the shaft 3.

As described above, according to the motor for driving an optical disc according to the present invention, since the metal bearing is pressed and fixed to the bush, the distance between the disc and the upper end of the metal bearing is shortened. Therefore, a relatively equal load is applied to the upper end and the center of the shaft in contact with the metal bearing, thereby preventing single wear of the metal bearing supporting the shaft.

Claims (1)

A base plate, a housing installed on the base plate, a shaft having a lower end side rotatably installed on the base plate portion located inside the housing, an armature core fixed to an outer surface of the housing, exposed to an upper side of the housing Light including a bush coupled to the upper end side of the shaft, a turntable and a rotor yoke coupled to the bush, a driving magnet coupled to the rotor yoke to face the armature core, and a metal bearing supporting rotation of the shaft In the disc drive motor, In the bush, a recess portion and a support portion extending downward from the recess portion are formed, The metal bearing is press-fit fixed to the recess and the support, The upper circumferential side and the central circumferential side of the shaft exposed to the upper side of the housing are supported by being in contact with the metal bearing, The base plate is a motor for driving an optical disc, characterized in that a support hole for press-fitting the lower end of the shaft is formed.

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