JP2007090349A - Vibration linear actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a conventional vibration linear actuator that generates vibration in the mounting surface direction of a substrate and has high heat resistance.
A vibration linear actuator according to the present invention is electrically connected to a substrate of a portable information terminal and has a base portion having an electrode on the bottom surface that is electrically connected to a coil portion, and is perpendicular to the substrate. A movable part 4 having a permanent magnet 2 supported via an elastic body 6 so as to be freely vibrated in a direction, and a coil part 2 for generating an oscillating magnetic field with respect to the movable element 4, and the base part 9, and a cover case 7 that covers the base 4 and covers the movable element 4 and the stator 3.
[Selection] Figure 1

Description

  The present invention relates to a vibration linear actuator used for a portable information terminal or the like.

  Currently, the vibration calling function is indispensable in portable information devices such as mobile phones. As portable information devices are made thinner, vibration generators are also desired to be made thinner. Also, from the viewpoint of improving the degree of integration of portable information devices, it is desirable that the vibration generator be surface-mounted on a substrate in the same manner as other electronic components.

Conventionally, a vibration generating device for surface mounting has a stator 21, a coil 22, a rotor 23, a magnet 24, an unbalanced weight 25, an outer shell 26, a shaft 27, a thrust receiver 28, a substrate 29, as shown in FIG. It was a flat cylindrical rotary motor provided with a metal surface 30 and lands (terminals) 31. However, since the rotation direction is parallel to the mounting surface, the vibration direction is also parallel to the mounting surface of the substrate. Therefore, since the direction in which humans can easily feel vibration is the mounting surface direction of the substrate, it is desirable that vibration be generated with respect to the mounting surface direction of the substrate.

  Further, as a device for generating vibration in the mounting surface direction of the substrate, a multi-function vibration actuator having both a vibration function, a speaker function, and a buzzer function as shown in FIG. 14 has been developed. This multi-function vibration actuator includes a yoke 41, a voice coil 42, a magnet 43, a diaphragm 44, a frame 45, and a frame 46. However, since it is used as a sound source, it cannot be covered with the outer shell, or a sound is generated from the diaphragm 44. Therefore, due to the heat resistance problem of the material, it is not suitable for melting and mounting the solder on the substrate.

  Thus, the conventional vibration linear actuator has not been realized that generates vibration in the mounting surface direction of the substrate and has high heat resistance.

  An object of the present invention is to solve such a problem, and to provide a vibration linear actuator that generates vibration in the mounting surface direction of the substrate and has high heat resistance.

  The vibration linear actuator according to the present invention is a vibration linear actuator attached to a substrate of a portable information terminal, and a base portion having an electrode on the bottom surface that is electrically connected to the substrate and electrically connected to a coil portion described later, and the substrate A movable part having a permanent magnet supported via an elastic body so as to freely vibrate in a vertical direction with respect to the movable part, and a coil part for generating an oscillating magnetic field with respect to the movable part. The stator includes a supported stator, and a cover case that covers the base and covers the movable element and the stator.

  The vibration linear actuator of the present invention has high heat resistance, and the vibration linear actuator can be attached to the mounting substrate by reflow processing.

  The vibration linear actuator according to the present invention is a vibration linear actuator attached to a substrate of a portable information terminal, and a base portion having an electrode on a bottom surface that is electrically connected to the substrate and electrically connected to a coil portion described later, A mover having a permanent magnet supported via an elastic body so as to be able to vibrate in a vertical direction with respect to the coil, and a coil part that generates an oscillating magnetic field with respect to the mover. A supported linear stator and a cover case that covers the base and covers the movable element and the stator are provided, and a highly heat-resistant vibration linear actuator can be provided.

  The mover of the vibration linear actuator of the present invention may be supported by an elastic body attached to the stator.

  Further, the mover, the stator and the cover case of the vibration linear actuator of the present invention may be made of a metal substance.

  The vibration linear actuator of the present invention may be mounted as a vibration motor for a portable information terminal.

  Moreover, assembly can be facilitated by attaching the vibration linear actuator of the present invention to the substrate of the portable terminal by reflow processing.

  An embodiment of the present invention will be described with reference to FIGS.

  1, 2 and 3 show the configuration of the vibration linear actuator. The vibration linear actuator 1 includes a polygonal outer yoke 4, a cylindrical inner yoke 3 positioned inside the outer yoke 4, a coil portion 2 in which a winding is wound around the inner yoke 3, and an outer yoke 4. And a magnet portion 5 disposed on the side facing the inner yoke 3. The inner yoke 3 and the outer yoke 4 are metal substances formed of a green compact. The inner yoke 3 and the outer yoke 4 may be configured by radial lamination of thin steel plates (thin steel plates are laminated around the shaft 8).

  The inner yoke 3 has a shaft 8 at the center, and the shaft 8 projects from the bottom surface of the inner yoke 3. The inner yoke 3 is positioned by the protrusion of the shaft 8 and the recess of the base 9 and fixed on the base 9. A lower support member 6 is sandwiched between the base 9 and the inner yoke 3. The base 9 is made of a resin having a heat-resistant glass transition temperature of 90 degrees or more.

  The support material 6 is a ring-shaped thin spring plate as shown in FIG. The support member 6 is set so as to give a force to move the outer yoke 4 downward when it moves above the balance point.

  The coil portion 2 is electrically coupled to a metallic land 11 extending from the bottom surface of the base 9, and power is supplied from the land 11. The land 11 may be provided not on the bottom surface of the base 9 but on the top surface of the outer lid 7.

  The outer lid 7 covers the inner yoke 3 and the outer yoke 4 and is fixed by caulking with a lid caulking portion 10 provided on the base 9. The outer lid 7 avoids contact with other components inside the vibration 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.

  Such a vibration actuator 1 causes a current supplied from the land 11 to flow to the coil portion 2 to generate a vibration magnetic flux. The outer yoke 4 vibrates according to the oscillating magnetic flux.

  FIG. 3A shows the bottom surface of the base of the vibration actuator, and the land 11 is exposed on the bottom surface of the base 9. FIG. 3B is a perspective view of the vibration actuator.

  The feature of the present invention is that the linear actuator 1 having the above-described configuration is directly attached to the substrate of the mobile terminal, the vibration direction of the vibration actuator 1 is perpendicular to the substrate 12, and the vibration actuator 1 is relative to the substrate 12. It can be attached by reflow processing.

  4A and 4B show a vibration linear actuator attached to the substrate of the mobile phone shown in FIG. The substrate 12 of the cellular phone is a double-sided multilayer substrate on which other electronic components are integrated and mounted, but the display is omitted.

  The land 11 of the vibration actuator 1 is reflow soldered to the land of the substrate 12 of the mobile phone. The substrate 12 of the mobile phone has a motor drive circuit, which controls the coil unit 2 by exciting it through the land 11.

  As described above, the vibration actuator of the present embodiment is separated by the base 9 in which the plurality of lands 11 are arranged on the bottom surface side and they serve as insulating portions. Since the terminal structure is such that it can be soldered if it is placed on the substrate 12 of the mobile phone and heated, it is compatible with the SMT mounting method (Surface Mount Technology) and can be soldered by the reflow method. Here, as shown in FIG. 1, if the lands 11 of the base 9 do not protrude from the bottom surface region to the side surface, the distance between adjacent electronic components can be narrowly mounted with high density. Further, the land 11 can be protruded from the bottom surface so as to engage with the hole of the board 12 of the device, and a strong fixing force can be obtained by soldering the land 11.

  Further, in the vibration linear actuator of the present embodiment, a land 11 that does not participate in electrical connection may be provided on the bottom surface side, and the coupling area between the substrate 12 and the motor may be increased to be firmly coupled. By doing so, it is possible to improve the impact resistance when the mobile phone is dropped.

  In the vibration linear actuator of the present embodiment, the plurality of lands 11 on the bottom surface are arranged on either side with respect to a line passing through the centroid of the bottom surface. Furthermore, it is better to arrange them symmetrically. In many cases, the centroid of the bottom surface substantially coincides with the position of the center of gravity of the vibration linear actuator, but by arranging the terminals symmetrically, the resultant force of the holding force of each terminal can be made coincident with the position of the center of gravity. That is, the impact force can be evenly distributed to each terminal, and the impact resistance when the device is dropped can be maximized. As described above, the technology for firmly supporting the vibration linear actuator by the solder joint structure between the bottom surface of the vibration linear actuator and the substrate of the device is the first point of improving the impact resistance.

  Further, the vibration linear actuator of the present embodiment is surrounded by the outer shell over substantially the whole. Therefore, since the inside can be protected from hot air and infrared rays for melting the solder in the reflow process, the internal motor structure can be prevented from being destroyed by heating, and the heat resistance is improved, making it suitable for the reflow soldering method. . Since the bottom surface is a printed circuit board, heat resistance and heat insulation are good and light. In addition, the outer shell makes the shape easy to handle, so it can be mounted on the board of the equipment with high efficiency and dust can be prevented from entering, so the motor can be prevented from being locked by dust and the reliability of the vibration linear actuator can be prevented. Can maintain sex.

  Further, as shown in FIG. 4, the vibration linear actuator 1 moves in the direction perpendicular to the substrate 12 of the portable information device, and is characterized by a large amount of vibration in the user's sensation direction.

  As for the shapes of the inner yoke 3 and the outer yoke 4, the outer yoke 4 is formed into a polygonal shape from the viewpoint that the thrust is proportional to the mass of the movable portion and the magnet portion 5 and the coil portion 2 are attached. However, as shown in FIGS. 6 and 7, the outer yoke 4 may have a cylindrical shape. The shape of the inner yoke 3 may also be a polygonal shape.

  Further, as shown in FIG. 8, the support material 6 may be only one of the upper and lower sides of the inner yoke 3 and the outer yoke 4.

  Further, as shown in FIG. 9, the support member 6 may be a coil spring, and one end of the support member 6 may be fixed to the outer shell 7 and the other end may be fixed to the outer yoke 4.

  As shown in FIG. 10, the outer yoke 4 may be a fixed portion, and the inner yoke 3 may be a movable portion.

  In addition, as shown in FIG. 11, when a coil spring or the like is used as a support material, there is a possibility that a side force in a direction perpendicular to the vibration direction may become a problem, so a pin is used to hold a gap between the movable part and the fixed part. 14 may be raised and the pin 14 may be oscillated along the inner yoke 3. A sliding cylinder 15 is provided inside the inner yoke 3, and the pin 14 is located in the cylinder of the sliding cylinder 15.

  In the vibration linear actuator, since eddy current flows in a direction perpendicular to the vibration direction, as shown in FIG. 12, in order to reduce eddy current, the inner yoke 3 and the outer yoke 4 are moved to the vibration direction. Alternatively, a treatment for partially increasing the resistance value by laser irradiation or the like may be performed.

Sectional view of the vibration linear actuator of the present invention Top view of the linear actuator with the lid removed (A) Bottom view of the vibration linear actuator (b) Perspective view (A) Top view of substrate of vibration linear actuator (b) Side view The figure which shows the mobile telephone carrying the vibration linear actuator of this invention (A) Cross-sectional view of a linear actuator having a cylindrical outer yoke (b) Top view of the linear actuator with the lid removed (A) Bottom view of the linear actuator (b) Perspective view of the linear actuator (A) Cross-sectional view of a linear actuator with a support member provided only below (b) Top view of a linear actuator with the lid removed Sectional view of a linear actuator that fixes one end of the support material to the cover case and the other end to the outer yoke Sectional view of linear actuator with outer yoke as fixed part and inner yoke as movable part Sectional view of a linear actuator where the movable part vibrates along the support pin Diagram showing inner yoke irradiated with laser A diagram showing a conventional rotary vibration motor A diagram showing a conventional vibration actuator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Linear actuator 2 Coil part 3 Inner yoke 4 Outer yoke 5 Magnet part

Claims (6)

In a vibration linear actuator attached to the substrate of a portable information terminal,
A base portion having an electrode on the bottom surface that is electrically connected to the substrate and electrically connected to the coil portion described later;
A mover having a permanent magnet supported via an elastic body so as to freely vibrate in a direction perpendicular to the substrate;
While having a coil part which generates an oscillating magnetic field with respect to this mover, a stator supported by the base part,
A vibration linear actuator comprising a cover case that covers the base and covers the mover and the stator.    2. The vibration linear actuator according to claim 1, wherein the electrode is formed of a metal land, and the base portion is attached to a substrate of a portable information terminal by reflow soldering the metal land.    The vibration linear actuator according to claim 2, wherein a plurality of the metal lands are arranged on the bottom surface of the base portion.    The vibration linear actuator according to claim 2, wherein the metal land and the metal land not involved in electrical connection are arranged on the bottom surface of the base portion.    The vibration linear actuator according to claim 1, wherein the mover, the stator, and the cover case are made of a metal material.   A portable information terminal in which the vibration linear actuator according to claim 2 is attached to a substrate by reflow soldering.

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