KR20020049066A - Spindle motor for disk player - Google Patents

Abstract

PURPOSE: A spindle motor for a disk player is provided to differently mold upper and lower diameters of a mounting hole of a center ring, and to coat an adhesive one of the diameters, thereby reducing a pressing force of the center ring pressed to a burning unit of a rotor and increasing adhesive strength fixed by the adhesive. CONSTITUTION: A frame(1) forms a projected holder(2) on a center. A bearing(3) is pressed to an axis ball vertically pierced on a center of the holder. A core(4) wound by a coil is fixed on an external diameter of the holder. The core is opposite to a magnet(7) attached to one side of a rotor(6), to generate an electromagnetic force. The axis ball of the bearing inserts a shaft(5) thereto. The shaft downwardly extends an end of an external side, and is coupled with the rotor on one side. The rotor forms a burning unit(10) projected in an upper direction on a center. An upper end of the shaft is coupled with an internal diameter of the burning unit. A center ring(20) formed with a mounting hole(21) is pressed to an external circumference of the burning unit. One pair of guide grooves(6a) are installed on an edge of the center ring. A chucker(30) is slidingly supported by a spring(31) to internal/external sides of the guide grooves.

Description

Spindle motor for disk player

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spindle motor, and more particularly, to a spindle motor for a disc player that rotates at high speed by seating a disc in a disc player.

In general, optical disks (optical disks) are relatively high-density recording and reproduction, and can be stored semi-permanently compared to magnetic recording tapes and LP in recent years, optical disk players using them are widely used.

Such optical disc players include a laser disk player, a compact disk player and a digital versatile disc. Among these optical disc players, the optical disc player is particularly small and portable. Compact disc players are widely used, but in recent years, DVDs having a larger storage capacity and the same size than compact discs are rapidly spreading.

In such an optical disc player, one of the most important factors is to rotate the disc at high speed without flow, and thus it is important to chuck the disc to rotate the disc at high speed without flow.

1 is a schematic cross-sectional view showing a conventional spindle motor for a disc player.

As shown, the spindle motor for playing the disc D is composed of a motor generating a driving force, a centering 150 and a chucking assembly which are axially supported by the motor and rotated at high speed.

The motor protrudes the holder 101 in a tubular shape at the center of the frame 100, and presses the bearing 110 into the inner diameter of the holder 101. In addition, the outer diameter portion of the holder 101 is fixedly mounted with a core 120 wound around a coil at an outer circumferential end thereof.

Here, the bearing 110 is rotatably inserted into the shaft 130, the shaft 130 is provided with a thrust washer 135 rotatably at the lower end.

On the other hand, the inner diameter of the lower end of the bearing 110 is shielded by the plate 136 is blocked from the outside.

In addition, the rotor 140 is integrally coupled to the upper end of the shaft 130 and rotated, and the rotor 140 has a downwardly open cap shape, and the inner diameter surface of the extended end faces the outer diameter surface of the core 120. The magnet 145 is magnetized.

In the motor having such a configuration, when power from the outside is applied to the core 120, the rotor 140 to which the magnet 145 is attached is rotated by mutual electromagnetic force between the core 120 and the magnet 145. As a result, the shaft 130 coupled with the rotor 140 is supported by the bearing 110 to rotate simultaneously.

Meanwhile, the chucking assembly axially supported by the motor is provided with a center ring 150 having a flange formed on a lower surface thereof.

That is, the center ring 150 is provided with a mounting hole 151 through which the center portion is vertically penetrated, and through the mounting hole 151 on the outer diameter surface of the upper end of the rotor 140, that is, the burning portion 141 (burring). It is fixed by indentation.

At least two or more guide grooves 152 having a predetermined depth are formed at the edge of the center ring 150.

The chucker 160 is slidably coupled to the guide groove 152 of the center ring 150 inwards and outwards. In particular, the chucker 160 has a spring 161 provided on the guide groove 152 of the center ring 150. It is always elastically supported in the outward direction.

In the conventional chucking assembly having such a configuration, when the user presses and supports the disk D toward the center ring 150, the chucker 160, which is elastically supported to the outside by the pressing force of the disk D, is pushed inward. In the inserted state to some extent, the chucker 160 is moved to the outside by the spring 161 to press and support the disk D through the lower end.

However, in the conventional spindle motor for a disc player as described above, since the center ring 150 is formed by an injection process, the degree of molding thereof is not uniform.

Therefore, when the injection molding of the center ring 150, which has severe molding dispersion, is pressed into the burning part 141 of the rotor 140, even if the injection part is cracked in the center ring 150 or the injection amount is large, the center ring 150 is cracked. This will cause problems.

Therefore, the crack generated in the center ring 150 as described above expands the inner diameter of the center ring 150 as a result of which the center ring 150 is easily separated and flows from the burning part 141 of the rotor 140. It also causes the product quality to be greatly degraded, such as being easily separated and damaged by external force or impact force.

The present invention was created in order to solve the above-mentioned conventional problems, and an object of the present invention is to reduce the amount of indentation of the centering to be pressed into the burning part of the rotor while maintaining a firmly coupled state by the adhesive strength The purpose is to provide a spindle motor.

1 is a schematic cross-sectional view showing a conventional spindle motor for a disc player;

2 is a cross-sectional view showing a spindle motor for a disc player according to the present invention;

Figure 3 is a cross-sectional view showing the centering in the spindle motor according to the present invention.

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

1: frame 2: holder

3: bearing 4: core

5: shaft 6: rotor

6a: guide groove 7: magnet

10: burning part 20: centering

21: mounting hole 21a, 21b: upper and lower inner surface

30: chucker 31: spring

Disc: D Glue: b

Spindle motor for a disc player according to the present invention for realizing the above object is a frame in which the core is mounted on the outer diameter of the holder protruding in the tubular shape and the bearing is pressed in the inner diameter portion, the shaft rotatably inserted into the bearing And a rotor having a magnet attached to the core and a mounting hole press-fitted on the outer diameter surface of the burning portion of the rotor. And a spindle motor for a disc player provided with the center ring and having a chucker for fixing the disc,

The mounting hole of the centering ring is formed differently from the upper and lower diameters of the inner diameter surface, one of which is characterized in that the adhesive is applied.

One preferred feature of the present invention is that the mounting hole of the center ring is configured such that the upper inner diameter surface is fixed by indentation with respect to the burning portion of the rotor, and the lower inner diameter surface is fixed by the adhesive.

Another desirable feature of the present invention is that the centering hole is provided so that the upper inner diameter surface is fixed by an adhesive with respect to the burning portion of the rotor, the lower inner diameter surface is fixed by indentation.

Another preferred feature of the present invention, the mounting hole of the center ring is that the adhesive is applied to the inner diameter surface having a large diameter among the upper and lower inner diameter surfaces.

Hereinafter, a spindle motor for a disc player according to the present invention will be described with reference to the accompanying drawings.

2 is a cross-sectional view showing a spindle motor for a disc player according to the present invention, Figure 3 is a cross-sectional view showing the centering in the spindle motor according to the present invention.

As shown therein, the spindle motor for the disc D player is largely composed of a motor for generating rotational force by power supply, a centering 20 for guiding the disc D to an axis center position, and a chucker assembly.

The motor is roughly divided into a fixed member consisting of the frame 1, the bearing 3, and the core 4, and a rotating member consisting of the shaft 5, the rotor 6, and the magnet 7.

The frame 1 is integrally formed with a holder 2 protruding upward in a tubular shape at the center, and the holder 2 is fixed by pressing a bearing 3 into a shaft hole vertically penetrated to the center.

The outer diameter portion of the holder 2 is fixedly mounted with a core 4 wound around a coil to which power is applied to an outer circumferential end, and the core 4 has a magnet attached to one side of the rotor 6 to be described later. By being disposed opposite to (7), a predetermined electromagnetic force is generated by interaction.

On the other hand, the bearing (3) is formed with a shaft hole penetrated in the vertical direction in the center portion, the shaft (5), which is a rotating member, is rotatably inserted into the biaxial hole.

The shaft 5 extends the outer end of the outer side to the upper end and the rotor 6 is attached to the magnet 7 is attached to one side.

At this time, the rotor 6 is formed with a tubular burning portion 10 protruding upward from the center portion, the upper end of the shaft 5 is coupled to the inner diameter surface of the burning portion 10 by press-fitting.

On the other hand, the center ring 20, the mounting hole 21 is formed at the center of the outer peripheral portion of the burning section 10 of the rotor 6 is fixed by press-fitting.

The center ring 20 is provided with a pair of guide grooves 6a at the edge, and the guide grooves 6a are provided while being supported by the spring 31 so that the chucker 30 can slide in and out.

Such a configuration is almost the same as that of the spindle motor for a disc player. However, the present invention has the most prominent feature to increase the fixation, that is, the adhesive strength by the adhesive (b) while reducing the indentation amount of the center ring 20.

3 shows a centering 20 in a spindle motor for a disc player according to the present invention. As shown in FIG. 3, the centering 20 has a diameter of upper and lower inner diameter surfaces 21a and 21b of the mounting hole 21. Molded differently, one of them is made of a structure in which the adhesive (b) is applied.

That is, the mounting hole 21 of the center ring 20 is formed so that the upper inner diameter surface 21a can be fixed by indentation with respect to the outer diameter of the burning portion 10 of the rotor 6, and the lower inner diameter surface 21b. ) Is made larger than the upper inner diameter surface 21a to form a space for applying the adhesive (b).

Therefore, when the center ring 20 is fixed to the outer diameter surface of the burning portion 10 of the rotor 6 by a press-fitting process, the lower inner diameter surface 21b of the mounting hole 21 has a diameter that the burning portion 10 has. As it is larger than the outer diameter surface 21a of the mounting hole 21, the insert is easily inserted.

At this time, an adhesive (b) is applied to the lower inner diameter surface 21b having a larger diameter than the upper inner diameter surface 21a to be bonded to the burning part 10 by adhesion.

On the other hand, the center ring 20 as described above may be molded by changing the diameter of the upper and lower inner diameter surface (21b) of the mounting hole (21).

That is, the mounting hole 21 of the center ring 20 is formed so that the lower inner diameter surface 21b can be fixed by indentation with respect to the outer diameter of the burning part 10 of the rotor 6, and the upper inner diameter surface 21a. ) Is made larger than the lower inner diameter surface 21b to form a space for applying the adhesive (b).

therefore. When the center ring 20 is fixed to the outer diameter surface of the burning portion 10 of the rotor 6 by a press-fitting process, the lower inner diameter surface 21b of the mounting hole 21 is proportional to the diameter of the burning portion 10 or Or it is molded so small that it is forcibly fitted by press-fitting, and the upper inner diameter surface 21a is easily inserted because it is larger than the outer diameter of the burning portion 10.

In this case, an adhesive (b) is applied to the upper inner diameter surface 21a having a diameter larger than that of the lower inner diameter surface 21b, thereby being bonded to the burning part 10 by adhesion.

Therefore, the amount of indentation of the center ring 20 assembled by the indentation process to the burning part 10 of the rotor 6 in the spindle motor for a disc player formed as described above is significantly reduced compared to the past, Since the adhesive strength is increased, it is possible to provide a firm bonding force by the adhesive (b) while minimizing cracking and breakage of the centering 20 generated during the indentation.

The spindle motor for a disc player according to the present invention constructed and operated as described above reduces the indentation amount of the center ring pressed into the burning part of the rotor and at the same time increases the adhesive strength fixed by the adhesive, thereby reducing the indentation amount of the centering. There is an advantage that can be prevented in advance in the breakage and cracking during the assembly process.

Therefore, the generation of defective products in the press-fitting process of the centering can be greatly suppressed, and the quality of the product can be improved.

Claims (4)

The core is mounted on the outer diameter of the tubularly protruding holder and the frame is press-fitted to the inner diameter, the shaft rotatably inserted into the bearing, and the burning portion to which the upper end of the shaft is fitted are protruded into a cap shape. A disc player having a rotor having a magnet for interacting with the core on a downwardly extending inner diameter surface, a centering formed with a mounting hole press-fitted into the outer diameter surface of the burning part of the rotor, and a chucker provided at the centering to fix the disk. In the spindle motor for The mounting hole of the center ring is formed in the upper and lower diameters of the inner diameter is different from each other, one of the spindle motor for the disc player, characterized in that the adhesive is applied, The method of claim 1, wherein the mounting hole of the center ring Spindle motor for a disc player, characterized in that the upper inner diameter is fixed to the burning portion of the rotor by pressing, the lower inner diameter is fixed by an adhesive, According to claim 1, wherein the center ring is mounted hole Spindle motor for a disc player, characterized in that the upper inner diameter surface is fixed by the adhesive with respect to the burning portion of the rotor, the lower inner diameter surface is fixed by pressing According to claim 1, wherein the mounting hole of the center ring Spindle motor for a disc player, characterized in that the adhesive is applied to the inner diameter of the upper, lower inner diameter of the large diameter surface.