JP4572671B2 - Thrust vibration combined vibration motor - Google Patents

Description

  The present invention relates to a motor for generating vibration that can be sensed by humans, and more particularly to a vibration generating motor capable of generating vibration in a thrust direction.

  In a mobile communication terminal, vibration is used to notify only a specific person (user) of an incoming call. In such incoming call notification means, a motor is used as a vibration source.

  Since recent mobile communication terminals are required to be smaller and thinner, the motor as a vibration generation source incorporated therein is required to have a book shape. For this reason, a flat vibration type motor is generally used for a mobile communication terminal as a vibration generation source.

  However, in the conventional flat vibration motor, the vibration is generated in the radial direction (radial direction), and therefore the motor vibrates in a direction parallel to the mounting surface. When the motor vibrates parallel to the mounting surface, the generated vibrations are difficult for humans to detect. Therefore, it is necessary to increase the number of rotations or increase the amount of eccentricity so that humans can easily detect vibrations.

As a motor that generates vibration that is easy for humans to detect, there is a “flat type vibration brushless motor” disclosed in Patent Document 1. By providing a convex portion on the outer periphery of the rotor frame and a groove indicated by a function of Y = a / sin (2nθ) on the inner peripheral portion of the motor case, the convex portion slides along the groove when the rotor rotates. It generates vibration in the thrust direction.
JP-A-5-38093

  However, since the magnetic force acting on the rotor changes with the displacement in the thrust direction, it is difficult for the invention described in Patent Document 1 to be designed and manufactured so that the rotor generates thrust vibration with a desired strength. .

  Moreover, since a groove must be formed on the inner peripheral surface of the motor case, processing is difficult and the manufacturing cost increases. Further, since the motor must be assembled so that the convex portion and the groove are engaged with each other, workability at the time of assembly is low. Furthermore, since the convex portion is moved along the groove, the sliding resistance increases and the amount of heat generation also increases.

  Moreover, when n is an odd number, the direction of vibration is reversed between one end and the other end of the rotor frame, and bending stress repeatedly acts on the motor shaft. For this reason, there exists a possibility that a motor shaft may fracture | rupture by fatigue.

  As described above, the invention described in Patent Document 1 has a problem that it is difficult to design, manufacture, and assemble and has low durability.

  The present invention has been made in view of such problems, and an object thereof is to provide a thrust vibration combined vibration motor that is easy to design, manufacture, and assemble and has high durability.

In order to achieve the above-mentioned object, the present invention includes a substantially annular magnet alternately magnetized in S and N poles, and is opposed to a rotor that rotates about a pivot and a magnet. A thrust vibration combined vibration motor housed in a space between the first case and the second case formed of a magnetic material,
The rotor is installed so as to be movable in the axial direction of the pivot,
The rotor has a first protrusion that is convex toward the second case,
The second case is provided with a thrust vibration combined vibration motor characterized in that the second protrusion is formed so as to repeat the collision and separation with the first protrusion as the rotor rotates. is there.

  In the thrust vibration combined vibration motor configured as described above, it is preferable that two or more first protrusions are formed. It is preferable that two or more second protrusions are formed. Moreover, it is preferable that the rotor is provided with an eccentric weight. The rotor is preferably made of a magnetic material. Moreover, it is preferable that the 1st case and the 2nd case are formed with the same material.

  According to the present invention, it is possible to provide a thrust vibration combined vibration motor that is easy to design, manufacture and assemble and has high durability.

A preferred embodiment of the present invention will be described. FIG. 1 shows a configuration of a thrust vibration combined vibration motor according to the present embodiment. This thrust vibration combined vibration motor has a rotor 2, a shaft 3, a coil 4, and a substrate 5, which are accommodated in an upper case 10 and a lower case 11.
The rotor 2 is composed of a base metal having a convex portion 2c, an eccentric weight 2a, a bearing 2d, and a permanent magnet 2b. The eccentric weight 2a plays the role of generating vibration in the radial direction in the same manner as a conventional vibration motor, in addition to the role of enhancing the vibration in the thrust direction generated by the rotor 2.

The upper case 10 and the lower case 11 are formed of a metal material. The lower case 11 is made of a material that generates an attractive force with the permanent magnet 2b, that is, a magnetic metal. The upper case 10 does not need to be formed of a magnetic metal, but if different materials are used for the upper case 10 and the lower case 11, a battery is formed. Therefore, it is preferable that these are formed of the same material.
The lower case 11 is provided with a convex portion 11 a and a substrate 5 for connecting the shaft 3 and the coil 4 is fixed.

  Here, for convenience, one of the pair of cases is the upper case 10 and the other is the lower case 11, but the thrust vibration combined vibration motor according to the present embodiment is mounted so that the upper case 10 is necessarily positioned vertically upward. There is no need to do this, and it can be mounted in any orientation.

  The substrate 5 is arranged so as to be drawn out from between the upper case 10 and the lower case 11 which are assembled and engaged. The substrate 5 receives power from the terminal 5 a and generates a magnetic field in the coil 4, thereby causing attraction and repulsion to the permanent magnet 2 b provided in the rotor 2. Thereby, the rotor 2 performs rotational movement on the same operation principle as a general motor.

  Note that the rotor 2 is attracted to the lower case 11 side by the magnetic force between the permanent magnets 2b in a state where power is not supplied.

When power is supplied to the motor, the convex portion 2 c is displaced so as to draw a circumference around the shaft 3 as the rotor 2 rotates. As shown in FIG. 2, when the convex portion 2 c rides on the convex portion 11 a of the lower case 11, the rotor 2 is displaced in the thrust direction (a direction away from the lower case 11).
When the rotor 2 further rotates and the convex part 2c passes through the convex part 11a of the lower case 11, the rotor 2 is attracted to the lower case 11 side by the magnetic force of the permanent magnet 2b, and the thrust direction (the direction approaching the lower case 11). ).
If there is one each of the convex part 2c and the convex part 11a, the rotor 2 repeats reciprocating motion in the thrust direction with one rotation as a cycle.

In the thrust vibration combined vibration motor according to the present embodiment, it is the convex portions 2 c and 11 a provided in the rotor 2 and the lower case 11 that generate vibration in the thrust direction. For this reason, precise processing is not required, and the manufacturing cost of parts can be reduced.
Further, as with the conventional radial vibration motor, the rotor 2 can be simply assembled to the shaft 3 and can be easily assembled.
Furthermore, since the rotor 2 moves in parallel along the shaft 3 when displaced in the thrust direction, no bending stress acts on the shaft 3.

  Furthermore, since the convex part 2c and the convex part 11a collide when generating the vibration in the thrust direction, the vibration in the thrust direction can be generated more strongly than the invention described in Patent Document 1.

  Thus, the thrust vibration combined vibration motor according to this embodiment is easy to design, manufacture and assemble, has high durability, and can easily obtain vibration in the thrust direction stronger than the conventional vibration motor.

In addition, the said embodiment is an example of suitable implementation of this invention, and this invention is not limited to this.
For example, the attachment position of the metal weight is not limited to the illustrated position, and can be changed as appropriate.
As described above, the present invention can be variously modified.

It is a figure which shows the structure of the thrust vibration combined vibration motor concerning suitable embodiment of this invention. It is a figure which shows the structure of the thrust vibration combined vibration motor concerning suitable embodiment of this invention.

Explanation of symbols

2 Rotor 2a Metal weight 2b Permanent magnet 2c, 11a Convex part 2d Bearing 3 Shaft 4 Coil 5 Substrate 5a Terminal 10 Upper case 11 Lower case

Claims (6)

A substantially annular magnet magnetized alternately in S and N poles, having a rotor that rotates about a pivot axis, and a coil that is arranged to face the magnet at an interval; A thrust vibration combined vibration motor housed in a space between a rotor and the coil between a first case and a second case formed of a magnetic material,
The rotor is installed movably in the axial direction of the pivot,
The rotor has a first protrusion that is convex toward the second case,
A thrust vibration combined vibration motor, wherein a second protrusion is formed on the second case so as to repeatedly collide with and separate from the first protrusion as the rotor rotates.   The thrust vibration combined vibration motor according to claim 1, wherein two or more of the first protrusions are formed.   The thrust vibration combined vibration motor according to claim 1, wherein two or more of the second protrusions are formed.   The thrust vibration combined vibration motor according to any one of claims 1 to 3, wherein an eccentric weight is provided on the rotor.   The thrust vibration combined vibration motor according to any one of claims 1 to 4, wherein the rotor is formed of a magnetic material.   The thrust vibration combined vibration motor according to any one of claims 1 to 5, wherein the first case and the second case are made of the same material.

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