KR100303881B1 - A vibration motor of flat type - Google Patents

Abstract

The present invention relates to a flat vibration motor, in particular, which prevents the shaft from being deformed by an external force applied to the bracket or the case by stepping the outer circumferential surface of the shaft coupled to the bracket and the case. In the vibration motor to connect the bracket with the case by the shaft and the rotor is eccentrically supported rotatably by the bearing on the shaft, the bracket and the case side end of the shaft to form the insertion end by reducing the outer diameter part The bracket and the case are formed such that a hole for forcibly inserting the insertion end of the reduced shaft is inserted into the hole formed in the bracket and the case, with the insertion end having the diameter reduced in the shaft being inserted into the inner peripheral portion of the hole. End is formed It is characterized by the configuration to be coupled to the engaging end portion is extended to the hanging outer diameter bar 50, no matter how severe the impact of the bracket 10, the bracket 10 and the case 70 by the configuration to simply improve the structure Even when applied to the case 70, the internal parts between the bracket 10 and the case 70 can be safely secured by preventing the shaft 50 from being deformed in the axial direction and the bracket 10 and the case 70 from being deformed. Protection so that a stable motor drive can be maintained.

Description

A vibration motor of flat type

The present invention relates to a flat vibration motor to prevent deformation of the shaft in the axial direction, and in particular, the outer circumferential surface of the shaft coupled to the bracket and the case is stepped so that the shaft is not deformed by an external force applied to the bracket or the case. To a flat vibration motor.

In general, a vibration motor used in a pager or a mobile phone is a very small driving member provided as a receiving means.

The vibration motor has a coin type and a rod type according to its shape, and the coin type is also called a flat type. FIG. 1 is a front sectional view showing the structure of a general flat vibration motor. 1) is provided, the lower end of the shaft (1a) is firmly fitted in the center of the bracket (1), and the upper surface of the bracket (1) extending from the central portion and this central portion to one side of the bracket (1) The flexible board | substrate 1b of the fine thickness made to adhere is made to adhere.

In addition, a multi-pole magnet 2 in which N and S poles are alternately magnetized is attached to the outer periphery of the center flexible substrate 1b, and the flexible substrate 1b is attached to the center space through which the magnet 2 penetrates. A pair of brushes (3, brush) attached to the lower end is provided at a predetermined angle.

The bearing 1c is coupled upwardly to the shaft 1a, and the semicircular rotor is eccentrically supported on the outer circumferential surface of the bearing 1c.

The rotor at this time is provided with a winding coil 5 and an injection molded product 6 simultaneously on the hard substrate 4 in which the circular flat plate is cut at a predetermined angle, and in particular, the bottom surface of the hard substrate 4 is supported by the bearing 1c. The commutator 7 including a plurality of segments is formed at an inner end thereof.

On the other hand, the upper case (8) is coupled to the upper end of the shaft (1a) in the form of a cap that is opened downward to block the components provided to the upper portion of the bracket (1) from external interference.

Such a vibrating motor is configured to energize the winding coil 5 by supplying power input from the outside to the winding coil 5 through the flexible substrate 1b, the brush 3, the commutator 7, and the hard substrate 4. The rotor is rotated by the generation of electromagnetic force due to the interaction between the magnets 2, and the rotor is eccentrically driven because the rotor is eccentrically supported by the shaft 1a, and this eccentric driving force is applied to the bracket 1 through the shaft 1a. As it is transmitted to, it vibrates the device.

However, in the above-described structure, both ends of the shaft 1a are forcibly inserted into the bracket 1 and the case 8 so that an external force greater than the pressing force of the shaft 1a is applied to the bracket 1 or the case as shown in FIG. 2. When applied to (8), a part of the shaft 1a, in particular in the bracket 1, comes out through the hole.

The axial movement of the shaft 1a moves the rotor eccentrically supported by the shaft 1a, so that parts which must be spaced apart from each other by a certain distance from each other and come into contact with or collide with each other become inoperable. there is a problem.

The present invention is to compensate for the above problems, the end portion of the shaft and the bracket forcibly inserted into the case is made smaller in diameter while the external pressure in the axial direction acts as a stopper in the stepped portion at each end The main purpose is to prevent the axial movement and deformation of the shaft while doing so.

In addition, the present invention has another object to extend the service life of the shaft while maintaining a stable against the impact of the input pressure of the shaft.

1 is a side cross-sectional view showing the overall structure of a general flat vibration motor,

FIG. 2 is a side cross-sectional view showing a deformation state when an impact is applied to the vibration motor of FIG. 1;

Figure 3 is a side cross-sectional view showing the structure of a vibration motor according to the present invention,

Figure 4 is an exploded perspective view showing the main structure according to the present invention.

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

10: bracket 50: shaft

51: insertion end 52: locking end

70: case

In order to achieve the above object, the present invention provides a vibration motor in which a rotor is eccentrically supported by a shaft while connecting a bracket and a case having a magnet by a shaft, the shaft being rotatable by a bearing,

The bracket and the case side end of the shaft form an insertion end by partially reducing the outer diameter, and the insertion end of the shaft and the diameter of the shaft is reduced by forming a hole for forcibly inserting the insertion end of the reduced shaft in the bracket and the case. While the force is inserted into the hole formed in the bracket and the case is characterized in that the inner end portion of the hole is coupled so that the engaging end portion is extended to the outer diameter from which the insertion end begins to form.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 illustrates a vibration motor according to the present invention, and a bracket 10 is provided at a bottom thereof, and a flexible substrate 20 and a magnet 30 are attached to an upper portion of the bracket 10 and a flexible substrate 20. ) Is attached to the lower end of the brush 40 so that the upper end is curved upward. The lower end of the shaft 50 is forcibly inserted into the center of the bracket 10, and the rotor 60 is eccentrically supported by the bearing 61 so as to be rotatable by the bearing 61. In addition, the upper end of the shaft 50 is fitted with a cap-shaped case 70 for covering the upper portion of the bracket 10 and the parts supported on the shaft 50 at the same time.

The structure of the vibration motor as described above is almost the same as before, only the present invention is to improve the coupling structure between the shaft 50 and the bracket 10 and the case 70 connected by the shaft 50, respectively. .

In other words, as shown in FIG. 4, the outer diameters of the upper and lower ends of the shaft 50 are further reduced to form the insertion end 51, and the bracket 10 and the shaft 50 of the case 70 are coupled to each other. Holes 11 and 71 are formed in portions at a diameter similar to the reduced outer diameter of the shaft 50 so that both insertion ends 51 of the shaft 50 can be forcibly fitted.

At this time, the stepped locking end portion 52 of which the outer diameter of the shaft 50 is reduced in size is caught in the periphery of the holes 11 and 71 of the bracket 10 and the case 70, and eventually the shafts 11 and 17 have a shaft. Only the insertion end 51 of 50 serves as a stopper for insertion.

Reference numeral 53 in the figure is a supporter for reducing the friction force when the bearing 61 rotates.

When the bracket 10 and the case 70 are connected by the shaft 50 in such a configuration, even if a strong external force acts on the bracket 10 or the case 70, one side of the shaft falls outwardly as before. This prevents the rotor from touching the inside of the bracket or case.

That is, when both ends of the shaft 50 are inserted into the holes 10 and 71 of the bracket 10 and the case 70 so that the outer diameter is reduced in shape, the uninserted diameter is expanded. The locking end 52 is caught on the periphery of the brackets 10 and the holes 11 and 71 of the case 70, thereby preventing further movement in the axial direction, and thus the bracket 10 or the case 70. Even if an external force greater than the pressing force of the shaft 50 is applied to the shaft 50, the shaft 50 can no longer move in the axial direction, thereby stably protecting the rotor 60 at all times.

Therefore, even when the device is inadvertently dropped and an impact is applied to the device, no matter how severe external force is applied to the bracket 10 or the case 70, the shaft 50 is completely deformed in the axial direction, and the vibration is always stable. To do this.

Therefore, the present invention provides a simple structure to improve the coupling structure of the shaft 50, the bracket 10, and the case 70, even if severe impact is applied to the bracket 10 and the case 70. By preventing the deformation in the axial direction and the deformation of the bracket 10 and the case 70 to protect the internal components between the bracket 10 and the case 70 to maintain a stable motor drive.

This, in turn, increases the endurance of the motor while prolonging its service life, thereby providing a very useful effect of greatly improving product reliability.

Claims (1)

In a vibrating motor in which a rotor having a magnet is eccentrically supported by a shaft while a bracket and a case having a magnet are connected by a shaft, the bracket and the case side end of the shaft are partially reduced in diameter so that the insertion end is reduced. And a hole for forcibly inserting the insertion end of the reduced shaft into the bracket and the case so that the insertion end of the reduced diameter of the shaft is forcibly inserted into the hole formed in the bracket and the case. Flat vibrating motor for engaging the engaging end is extended to the outer diameter that the insertion end begins to form.