JP3493593B2 - Vibration actuator for pager - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a portable telephone or the like and is used to notify a call when a signal arrives not only by voice but also by vibration, and is particularly small and lightweight. Can be used in.

[0002]

2. Description of the Related Art A conventional vibration actuator for a pager, which is also called a vibration motor for a pager or a vibration generating actuator, is required to be small and thin, capable of generating vibration with low power consumption, and inexpensive. However, since the purpose is only to generate vibration, it is naturally impossible to make a voice call or make a conversation sound. Therefore, at least two or more device parts are required to generate incoming call information and voice.

Further, the vibration actuator for a pager which is often used consumes a large amount of starting power because it rotates a relatively large mass. Further, since the structure is rotated, the number of parts is increased, and there are problems in reliability and accuracy control. Since a brush for switching current is used because a direct current is used, malfunction may occur during rotation, and there is a limit to miniaturization and flattening.

FIG. 11 shows the most commonly used vibration motor for a pager. The counterweight 48 rotates via a shaft 47 driven by a drive motor 46 composed of a cylindrical coreless rotor,
Whirling vibration is generated. The drive motor 46 is formed of a curved permanent magnet and a cylindrical coreless rotor, and it is necessary to form a plurality of magnetic poles in order to obtain a rotational driving force. There are limits in management and production costs. Furthermore, since the vibration modes are omnidirectional, there is a limit to how effectively the drive current applied to the coreless rotor can be effectively used for propagating vibration energy to the outside.

FIG. 12 is a perspective view showing the inside of another conventional vibration motor 49 for a pager constituted by a flat coreless rotor. The rotating shaft 51 is provided with a coil 50 of a disk-shaped winding having an eccentric center of gravity, and a rotational driving force is generated between the rotating shaft 51 and the thin-plate magnet 52. The drive current is supplied from the brush 53. Unlike the cylindrical type, instead of the counter weight, a winding coil 50 having an eccentric center of gravity is used. Vibration occurs during rotation. It is difficult to make a flat shape with an outer diameter of 20 mm or less and a few mm or less. Since this also adopts an omnidirectional vibration mode, there is a limit in which the drive current can be effectively used for vibration energy.

[0006]

Although a conventional vibration actuator for a pager can generate vibration, it cannot generate a sound, and the efficiency of conversion into external vibration energy is not always good. In addition, the starting power cannot always be reduced, and it is extremely difficult to reduce the external dimensions. There were limits to how low the cost could be made, and there were some that were prone to rotational malfunctions.

An object of the present invention is to obtain a vibration actuator for a pager which can generate vibration and sound and can effectively convert a driving current into vibration energy. It is an object of the present invention to provide a vibration actuator for a pager with few defects.

[0008]

In order to achieve the above object, in a vibration actuator for a pager of the present invention, a vibrating body which vibrates above and below a moving coil type electroacoustic transducer conventionally used for sound generation. To collide with a fixed portion in close proximity to generate vibration outside.

Further, the vibrating and colliding portion is formed in an annular flat portion so as to have the same size as the diameter of the moving coil type coil, and the colliding of the vibrating body is dispersed in the portion having strong structural strength.

Further, a damper having a large compliance that supports the bobbin and is displaced upward and downward and has a large compliance, and an annular flat portion are integrally formed of resin, and a vibrating body is provided therein.

A plate-shaped resin thin and narrow from the annular flat portion,
A plurality of spiral dampers are formed and the other end is fixed with resin.

Further, the above-mentioned damper is provided inside the bobbin, and the other end of the damper is integrally and continuously molded with a cylindrical resin having a step, and the portion is fixed to the hole of the plate above the magnet. Reduce the outer diameter.

A dome-shaped vibrating body is adhered to the annular flat portion so that sound can be generated by vibration due to a driving current having a frequency of several hundred Hz or more.

Elastic members are adhered to the upper and lower fixed portions of the vibrating body with which the annular flat portion collides to reduce the sound level at the time of collision. The material and shape of this elastic material may be made into an annular shape with urethane foam.

Further, in order to effectively propagate the vibration to the case of the mobile communication device, the annular flat portion of the vibrator is directly collided with the case.

Further, in order to increase the vibration of the case of the mobile communication device, the vibration actuator for the pager is not directly adhered and fixed, but is supported or adhered and fixed at a plurality of points by a nail-shaped member via an elastic material. .

In order to facilitate the assembling without disturbing the vibration of the vibrating body, slit-like notches are formed at two places of the yoke of the magnetic circuit so that the lead-out electrode wire from the coil can pass through.

As another embodiment, a plurality of spiral thin plate-shaped resin dampers are formed outside the annular flat portion,
Fix the other end with resin. Further, the vibrating body made of a dome-shaped resin is provided inside the annular flat portion, and the whole is integrally formed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on examples with reference to the drawings. FIG. 1 shows an embodiment of a vibration actuator for a pager according to the present invention, which uses the driving principle of a moving coil type electroacoustic transducer for generating a sound. The vibrating body 1 is bonded to the annular flat portion 8, and the damper 7 is formed by integrally molding the annular flat portion 8, the bobbin 9 and the resin.

The damper 7 supports the central positions of the vibrating body 1 and the bobbin 9, and is configured to be softly displaced in the vertical direction, and is supported by the damper supporting portion 10. The damper support portion 10 has a cylindrical structure having a step, and is fixed to the hole 13 at the center of the plate 6.

A cylindrical coil 3 having a thin conductor wire wound a plurality of times is formed on the outer circumference of the bobbin 9. Having a bobbin 9,
By being integrally formed with the annular flat portion 8 with resin, structural strength can be increased.

In the magnetic circuit, a disc-shaped magnetic plate 6 having a hole 13 in the center is bonded to one magnetic pole of a columnar permanent magnet 4 magnetized in the thickness direction, and the other magnetic pole is molded. It is configured by bonding the processed yoke 5 of the magnetic plate. An annular gap, in which the coil 3 and the bobbin 9 move up and down, is formed between the yoke 5 and the plate 6 to provide a space with a high magnetic flux density.

The vibrating body 1 is supported by a damper 7 at a position slightly apart from the collision cover 2, and when driven at a relatively low frequency, the vibrating body 1 collides with the collision cover 2 because the displacement of the vibrating body 1 becomes large. . The annular flat portion 8 that collides with the collision cover 2 is structurally strong and collides on average. The vibration generated by the collision propagates to the outside. A hole 13 is provided at the center of the magnetic circuit in order to prevent the back pressure of air from increasing when the vibrating body 1 and the damper 7 vibrate at a low frequency. The cross sectional structure is shown in FIG.

When the incoming signal is notified by vibration, it is driven at a low frequency of several hundreds hertz or less to transmit the collision vibration between the annular flat portion 8 and the collision cover 2 to the outside. At this time, the vibration direction is only the vertical direction, and the vibration energy can be efficiently extracted to the outside.

In order to increase the amplitude of vibration at a low frequency and not reduce the driving force, the damper 7 needs to have a structure having a large vertical compliance.

FIG. 9 shows a vibration actuator for a pager using a damper 36 having a conventional structure. Vibrating body 35,
The damper 36 that supports the bobbin 38 and the coil 39 is fixed by a support base 37. The conventional damper 36 is formed in a wavy shape and is impregnated with a phenolic resin or the like to have a relatively large compliance with respect to minute vibrations, so that the center position can be determined.

Even if the oscillator 35 and the bobbin 38 are driven by the current flowing through the coil 39 so as to largely change, the damper 36
Is not large for large displacements, so
The speed at the time of collision with the elastic members 44 and 45 may not be high or may not occur, so that large vibration cannot be obtained.

The conventional damper 36 has a limit in compliance because when the damper 36 moves up and down, the tension in the circumferential direction of the damper 36 becomes large and a large reaction occurs when it moves up and down.

FIG. 3 is a perspective view of the structure excluding the vibrating body 1 of FIG. 1, in which the damper 7 is continuously spiraled inward from the annular flat portion 8 into a plurality of thin thin plates. Formed and coupled to the damper support 10.

Since the spiral-shaped damper 7 can be made long, it can respond to a large amount of displacement in the vertical direction and can be soft, and since it has a width of 1 mm or more, it has a large rigidity in the width direction and is supported by a plurality of dampers 7. The deviation from the center of the annular flat portion 8 or the bobbin 9 can be made small.

If the damper 7 is formed inside the annular flat portion 8 as shown in FIG. 1, it is difficult to integrally form the damper 7 and the vibrating body 1. Therefore, it is necessary to form the vibrating body 1 as a separate component such as a dome shape, and to bond it to the annular flat portion 8.

In order to significantly reduce the collision noise generated when solid objects collide with each other, the annular elastic member 11 is attached to the fixed collision cover 2 on which the annular flat portion collides and the plate 6 portion. Bond 12 together. When urethane foam is used as the elastic material, the collision noise becomes very small. In order to reduce the thickness to about half of 1 mm, it may be formed by thermoforming.

In order to effectively propagate the vibration due to the collision to the outside, as shown in the sectional view of FIG. 4, the annular flat portion 8 is caused to directly collide with the case 16 of the mobile communication device through the elastic member 11. It is valid.

Further, in order to increase the vibration of the case 16, it is preferable that the entire vibration actuator for the pager is not adhered to the case 16 but the yoke 14 is supported by the claw 17 directly connected to the case 16 via the elastic spacer 15. Nail 1
It will be stable if the yoke 14 is adhered at the portion 7.

Considering the difficulty of the mold and the fact that the case 16 is inadvertently provided with holes, the resin part with the claws 17 is formed on the case 16 by integrally molding the claws 17 on the case 16. You may make it the structure fitted in.

Further, the elastic spacer 15 sandwiched between the yoke 14 and the case 16 may be the same as the elastic material 11 for continuously reducing the collision noise at the time of collision.

The sectional view of FIG. 5 also shows a method of effectively extracting energy at the time of collision as vibration. A large vibration can be obtained by shifting the position of the collision between the annular flat portion 8 and the adhesive portion 21.

In order to prevent the lead-out electrode wire 19 from the coil 3 from disturbing the vibration of the bobbin 9, the yoke 18
Slit-shaped yoke cutout portions 20 are provided at two locations in the opposite direction of the side surface portion of the above, up to near the bottom of the yoke 18, and the extraction electrode wire 19 is taken out. If the lead-out electrode wire 19 is left under the bobbin for a half circumference until it comes out to the notch 20 of the yoke, it is possible to flexibly cope with the vibration of the bobbin.

FIG. 6 shows another embodiment of the present invention.
This is a vibration actuator for a pager when the damper 27 is provided outside the annular flat portion 28. Damper 27
Is externally connected and fixed to the damper support portion 29.

An annular flat portion 28, a bobbin 30, and a vibrating body 22 are provided inside the damper 27, and a damper support portion 29 is provided outside.
However, all can be formed by integral molding of resin. This is an advantage different from the case of FIG. As a disadvantage, the outer diameter may be large, and if the emphasis is placed on reducing the outer diameter, there is a limit to how long the spiral damper 27 can be made.

FIG. 8 is a perspective view without the collision cover 33 of FIG. 6. As a result of adding the width of the damper 27, the slit 34, and the damper support portion 29 to the size of the outer diameter, the book of FIG. It is understood that the outer diameter is inevitably larger than in the previous embodiment of the invention. However, as described above, there is a great advantage that all the vibrating portions except the coil 23 can be formed by resin integral molding.

[0042]

Since the present invention is constructed as described above, it has the following effects.

The vibrating body is soft in the vertical direction and easy to move,
Since most of the driving force can be directly converted into kinetic energy, the energy at collision is large. Moreover, the vibration energy can be effectively extracted by moving only in the vertical direction and colliding with a resin or metal plate that is relatively thin and is not likely to be made, and can effectively propagate the vibration energy. Moreover, since the starting power is relatively small, the power consumption can be reduced.

Although the collision energy is large, the collision noise can be reduced. The reason is that an elastic material is provided in the collision portion, but the effect of using urethane foam is particularly large. Although a conventional vibration motor for a pager generates a sliding sound including a relatively high frequency component and becomes louder as the vibration level is increased, in the present invention, the high frequency component is small and the sound level is not always proportional to the vibration level. It does not become large and can be suppressed.

Furthermore, since the damper, bobbin, and annular flat portion can be integrally molded with resin or the like to form a continuous structure, and the structural strength can be increased, the cost can be reduced, and accuracy and reliability can be secured. Cheap.

Further, in the case of the present invention in which the damper is arranged inside, the outer diameter can be reduced despite the large diameter of the driving coil and the large driving force. Also, the thickness is 6m
It is highly possible that the thickness is about m and the thickness is acceptable when the functions of generating vibration and sound are combined.

Further, the assembling work and the accuracy control are simplified, and since there is no rotating portion as in the past, there is no brush or bearing portion, and the total number of parts can be reduced. Further, there is no drawback that the rotation does not start depending on the position of the electrical contact.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a vibration actuator for a pager of the present invention.

2 is a cross-sectional view of the embodiment of FIG.

FIG. 3 is a partially cutaway perspective view when the vibrating body of FIG. 1 is removed.

FIG. 4 is a sectional view of another embodiment of the present invention.

FIG. 5 is a sectional view of another embodiment of the present invention.

FIG. 6 is a partially cutaway perspective view of another embodiment of the present invention.

7 is a cross-sectional view of the embodiment of FIG.

8 is a partially cutaway perspective view when the collision cover of FIG. 6 is removed.

FIG. 9 is a partially cutaway perspective view when a conventional damper is used.

FIG. 10 is a sectional view of the embodiment of FIG.

FIG. 11 is a perspective view of a conventional cylindrical vibration motor for a pager.

FIG. 12 is a perspective view of the inside of a conventional flat type vibration motor for a pager.

[Explanation of symbols]

1, 22, 35 vibrating body 2, 33, 43 Collision cover 3, 23, 39 coils 4, 24, 40 magnets 5, 14, 18, 25, 42 Yoke 6, 26, 41 plates 7, 27, 36 damper 8, 28 annular flat part 9, 30, 38 bobbins 10, 29 Damper support 11, 12, 31, 32, 44, 45 Elastic material 13 holes 15 Elastic spacer 16 cases 17 nails 19 Lead-out electrode wire 20 York cutout 21 Adhesive part 34 slits 37 Support

Claims (8)

(57) [Claims] 1. A magnetic circuit is formed by a permanent magnet and a coil,
In an electroacoustic transducer composed of a vertically movable oscillator,
A bobbin around which the coil is wound, an annular flat portion orthogonal to the upper portion of the bobbin, and a spiral extension from the annular flat portion.
The other ends of multiple thin and narrow plate-shaped resins
A vibration for a pager, characterized in that the fixed damper and the resin are integrally molded, and a vibration is generated outside by colliding the fixed portion of the annular flat portion with a low-frequency electric signal input. Actuator. 2. The vibration actuator for a pager according to claim 1, wherein a damper is formed inside the annular flat portion, and a dome-shaped vibrating body is bonded to the annular flat portion. 3. A vibration actuator for a pager according to claim 2, wherein a damper support portion, which is formed integrally with the damper by continuous resin molding, is fitted and fixed in a central hole of the plate. 4. A vibration actuator for a pager according to claim 1, wherein the damper is formed outside the annular flat portion and the dome-shaped vibrating body is continuously formed inside the annular flat portion by integral molding of resin. 5. An elastic material is adhered in an annular shape to a fixed portion which collides with the annular flat portion , and urethane foam is used as the material thereof.
The vibration actuator for pager described in. 6. The vibration actuator for a pager according to claim 1 , wherein a resin case of the mobile communication device is directly used for a fixed portion on the opposite side of the magnet from the vibrating body, which collides with the magnet. . 7. The vibration actuator for a pager according to claim 6, wherein the vibration actuator is supported by a plurality of resin claws via an elastic material. 8. The vibration actuator for a pager according to claim 1, wherein the yoke of the magnetic circuit is provided with two slit-shaped notches to allow the extraction electrode from the coil to pass therethrough.