JP3931650B2 - Vibration linear actuator device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to improving the reliability of a vibrating linear actuator.
[0002]
[Prior art]
At present, a vibration calling function is indispensable in a portable information terminal such as a mobile phone, and a vibration linear actuator that vibrates in a direction in which the user can easily experience the vibration direction is desired.
[0003]
FIG. 8 shows the structure of the vibration linear actuator 1 that matches the vibration direction with the user's sense of direction. As shown in FIG. 8, by using an elastic body such as a leaf spring, the vibration linear actuator 1 is driven at a resonance frequency obtained from the mass of the leaf spring, the outer yoke as the mover, and the magnet portion, thereby achieving high efficiency. Drive is realized.
[0004]
[Problems to be solved by the invention]
However, in such a vibration linear actuator using the resonance phenomenon, for example, the mobile phone is dropped, or the speed of the automobile is increased with the mobile phone placed on the dashboard of the automobile. Therefore, a disturbance including a resonance frequency component may be applied to the mobile phone.
[0005]
When a disturbance including a resonance frequency component is applied to the mobile phone, there is no portion that consumes vibration energy in the vibration linear actuator, so the vibration linear actuator continues to vibrate and is driven at the resonance frequency. Since they are the same, the vibration amount becomes large as shown in FIG.
[0006]
When driven by a disturbance in this way, it is difficult to adjust the amount of vibration, which leads to a reduction in the life of the elastic body, and also has a significant problem with respect to impact resistance.
[0007]
[Means for Solving the Problems]
The present invention comprises a mover that reciprocally vibrates, a stator, an elastic body that connects the mover and the stator, and a coil unit that generates an oscillating magnetic field provided in the mover or the stator, The vibration linear actuator device is provided with a vibration damping resistor connected to the coil when no current is generated to generate a vibration magnetic field in the coil, and the vibration linear actuator is not energized. In this case, by connecting the vibration damping resistance unit to the vibration linear actuator, even if a disturbance including a resonance frequency is applied, the amount of vibration can be attenuated by the vibration damping resistor.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The vibration linear actuator device according to the present invention includes a movable element that reciprocally vibrates, a stator, an elastic body that connects the movable element and the stator, and a coil that generates an oscillating magnetic field provided in the movable element or the stator. A vibration linear actuator device, wherein the coil portion and the vibration damping resistance portion are connected when no current is generated to generate a vibration magnetic field in the coil portion. When not energized, by connecting the vibration damping resistance part including the winding resistance to the vibration linear actuator, even if a disturbance including the resonance frequency is applied, the vibration amount is attenuated by the vibration damping resistance part. Is possible. Further, even when the coil is short-circuited, attenuation is possible by the resistance of the coil portion.
[0009]
Further, the vibration linear actuator device of the present invention includes a mover having a permanent magnet, a stator having a coil portion that generates an oscillating magnetic field for the mover, and an elastic body connecting the stator and the mover. And when the current for generating the oscillating magnetic field does not flow through the coil part, a vibration damping resistance part connected to the coil part may be provided.
[0010]
Further, in the vibration linear actuator device of the present invention, when a current for generating a vibration magnetic field is passed through the coil part, the coil part and the vibration damping resistance part are disconnected and a current for generating a vibration magnetic field is generated in the coil part. When not flowing, a vibration damping resistance switching unit that connects the current of the coil unit to the vibration damping resistor may be provided.
[0011]
Furthermore, since the resistance value of the vibration damping resistance portion of the vibration linear actuator device of the present invention is one or more times the resistance value of the coil portion, vibration damping can be performed quickly.
[0012]
The vibration linear actuator of the present invention generates a movable element that reciprocally vibrates, a stator, an elastic body that couples the movable element and the stator, and an oscillating magnetic field provided in the movable element or the stator. A coil case and a cover case attached to the stator and covering the whole of the stator and the mover. The cover case is characterized in that an elastic sheet is provided on a vibration direction extension line of the mover. Even if an external impact is applied to the linear actuator, the mover is protected by the elastic sheet.
[0013]
【Example】
FIG. 1 shows the configuration of the vibration linear actuator. The vibration linear actuator 11 includes a polygonal outer yoke 14, a cylindrical inner yoke 13 positioned inside the outer yoke 14, a coil portion 12 having a winding wound around the inner yoke 13, and an outer yoke 14. And a magnet portion 15 disposed on the opposite side of the inner yoke 13. The inner yoke 13 and the outer yoke 14 are metallic substances formed of a green compact. Note that the inner yoke 13 and the outer yoke 14 may be formed by radial lamination of thin steel plates (thin steel plates are laminated around the shaft 18).
[0014]
The inner yoke 13 has a shaft 18 at the center, and the shaft 18 protrudes from the bottom surface of the inner yoke 13. The inner yoke 13 is positioned by the protrusion of the shaft 18 and the recess of the base 19 and fixed on the base 19. A lower leaf spring 16 is sandwiched between the base 19 and the inner yoke 13. The base 19 is made of a resin having a heat-resistant glass transition temperature of 90 degrees or more.
[0015]
The leaf spring 16 is a ring-shaped thin spring plate. When the outer yoke 4 moves below the balance point, the leaf spring 16 gives a force to move the outer yoke 14 upward, and the outer yoke 14 moves above the balance point. The leaf spring 16 is set so as to give a force for moving the outer yoke 14 downward.
[0016]
The coil portion 12 is electrically coupled to a metallic land 25 extending from the bottom surface of the base 19, and power is supplied from the land 25. The land 25 may be provided not on the bottom surface of the base 19 but on the top surface of the outer lid 17.
[0017]
The outer lid 17 covers the inner yoke 13 and the outer yoke 14 and is fixed by caulking at a lid caulking portion 20 provided on the base 19. The outer lid 17 avoids contact with other components inside the vibration linear actuator, protects the inside of the linear actuator during reflow processing, and facilitates handling of the linear actuator. The outer lid is made of metal, but may be made of a heat resistant resin.
[0018]
Such a vibration linear actuator 11 causes a current supplied from the land 25 to flow to the coil portion 12 to generate a vibration magnetic flux. The outer yoke 14 vibrates according to the oscillating magnetic flux. On the bottom surface of the base 19 of the vibration linear actuator 11, the land 25 is exposed on the bottom surface of the base 19.
[0019]
An elastic sheet 24 may be attached to one or both of the top surface 22 of the base 19 and the bottom surface 23 of the outer lid 17 in terms of improving impact resistance when the mobile phone is dropped. The shape of the elastic sheet 24 may not be a disk shape but may be a polygonal shape.
[0020]
The elastic sheet 24 may be made of rubber as long as the impact can be reduced when the outer yoke 14 and the magnet portion 15 collide with the bottom surface 22 of the vibration linear actuator 11 or the bottom surface 23 of the outer lid 7. A sponge may be used. FIG. 1B is a perspective view of the elastic sheet, and the elastic sheet 24 has a disk shape, but may have a polygonal shape.
[0021]
2A and 2B show the vibration linear actuator 11 attached to the substrate of the mobile phone shown in FIG. The mobile phone substrate 42 is a double-sided multilayer substrate on which other electronic components are integrated and mounted, but the display is omitted.
[0022]
The land 25 of the vibration linear actuator 11 is reflow soldered to the land of the substrate 42 of the mobile phone. The substrate 42 of the mobile phone has a motor drive circuit, which controls the coil unit 12 by exciting it through the land 25.
[0023]
The feature of the present invention is that, as shown in FIG. 4, a resistor 32 is attached to the vibration linear actuator 11, and all the vibration energy generated by the vibration linear actuator 11 due to disturbance is consumed by the resistor 32. The resistance value of the resistor 32 is 1Ω or more. The switching element 33 connects the resistor 32 and the vibration linear actuator 11 when the vibration linear actuator 11 is not energized. Further, when the vibration linear actuator 11 is energized, it is closed so that no current flows into the resistor 32.
[0024]
That is, when there is no need to make an incoming call to the user of the mobile phone, that is, when there is no need to energize the vibration linear actuator 11, a resistance including a winding resistance is provided in the vibration linear actuator 11, as shown in FIG. Connect the body 32. Even if a disturbance including a resonance frequency component is applied to the vibration linear actuator 11 by connecting the resistor 32, the vibration energy is consumed by the resistor 32. Therefore, the vibration generated by the disturbance is as shown in FIG. It becomes possible to attenuate.
[0025]
Thus, by connecting the resistor 32 to the vibration linear actuator 11 and attenuating vibration due to disturbance, the leaf spring 16 can have a long life, and the shock resistance of the vibration linear actuator 11 can be improved. It becomes possible.
[0026]
In the state where the vibration linear actuator 11 is not energized, as shown in FIG. 4, the vibration energy generated by the disturbance is completely consumed by the resistor 32 to attenuate the vibration amount of the vibration linear actuator 11. Instead, as shown in FIG. 6, by connecting a battery 34 instead of the resistor 32, vibration energy generated by a disturbance can be taken into the battery and charged.
[0027]
Further, as shown in FIG. 7, when the vibration linear actuator 11 is not energized, a resistor 32 including a winding resistance and a battery 34 are connected to the vibration linear actuator 11 and generated due to a disturbance including a resonance frequency component. It is also possible to attenuate the vibration amount.
[0028]
In this embodiment, a movable element with a permanent magnet is used as the vibration linear actuator. However, even if the movable element is a voice coil type, the same effect can be obtained.
[0029]
Further, such a vibration linear actuator device having a vibration linear actuator and a damping resistance unit is not limited to a vibration motor of a mobile phone, but is used for a compressor of an automobile in which the vibration of the automobile itself, the vibration of the engine, etc. cause disturbance. The same effect can be obtained. In addition, when an earthquake is considered as a disturbance factor, it is possible to obtain the same effect by providing a damping resistance portion in a compressor, particularly a refrigerator, an air conditioner, or the like.
[0030]
【The invention's effect】
In the present invention, when the vibration linear actuator is not energized, it is possible to improve the reliability of the vibration linear actuator against a disturbance including a resonance frequency component by connecting a damping resistor to the vibration linear actuator.
[Brief description of the drawings]
FIG. 1A is a sectional view showing a vibration linear actuator of this embodiment. FIG. 1B is a perspective view of an elastic sheet for preventing a collision of the vibration linear actuator. FIG. Fig. 3 is a side view of the mobile phone. Fig. 4 is a circuit diagram of a vibration linear actuator and a resistor according to the present embodiment. Fig. 5 is an attenuation of amplitude due to disturbance in the present embodiment. FIG. 6 is a circuit diagram of another embodiment. FIG. 7 is a circuit diagram of another embodiment. FIG. 8 is a cross-sectional view of a conventional vibration linear actuator. Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 11 Vibrating linear actuator 12 Coil part 13 Inner yoke 14 Outer yoke 15 Magnet part 16 Leaf spring 17 Outer lid 32 Resistor 34 Battery

Claims (10)

  A movable part that reciprocally vibrates, a stator, an elastic body that connects the movable part and the stator, and a coil part that generates an oscillating magnetic field provided in the movable part or the stator; An oscillating linear actuator device characterized in that the coil portion and the vibration damping resistance portion are connected when no current for generating an oscillating magnetic field is passed.   A movable part that reciprocally vibrates, a stator, an elastic body that connects the movable part and the stator, and a coil part that generates an oscillating magnetic field provided in the movable part or the stator; An oscillating linear actuator device characterized in that the coil portion is short-circuited when a current for generating an oscillating magnetic field is not passed.   The vibration linear actuator includes a mover having a permanent magnet, a stator having a coil portion that generates a vibrating magnetic field with respect to the mover, and an elastic body connecting the stator and the mover. Or the vibration linear actuator apparatus of Claim 2. When a current for generating an oscillating magnetic field is applied to the coil part, the coil part is not connected to the vibration damping resistance part, and when a current for generating an oscillating magnetic field is not supplied to the coil part, the coil part is connected to the vibration damping resistance part. The vibration linear actuator device according to claim 1, further comprising a vibration damping resistance switching unit connected to the vibration linear resistance device.   The vibration linear actuator device according to claim 1, wherein the resistance value of the vibration damping resistance portion is one or more times the resistance value of the coil portion.   An information portable terminal comprising the vibration linear actuator device according to claim 1, the vibration linear actuator device according to claim 2, or the vibration linear actuator according to claim 5.   A vibration linear actuator device according to claim 1, a vibration linear actuator device according to claim 2, or a compressor having the vibration linear actuator according to claim 5. A refrigerator comprising the compressor according to claim 7 . An air conditioner comprising the compressor according to claim 7 . An automobile comprising the compressor according to claim 7 .

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