JPH1127921A - Vibration actuator for pager - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure assembly accuracy easily and to improve reliability, for example, against vibration by fixing the part of the center hole of a vibrator vibrating vertically of moving coil consisting of a magnetic circuit being made entirely of, for example, a permanent magnet, a coil, and a damper by a support post that is made of a non-magnetic material. SOLUTION: A moving coil electroacoustic converter for generating voice is used, a damper 7 for achieving displacement relatively softly in vertical directions for supporting the center position and the vertical positions of a vibrator 1, and a part 9 with a center hole being integrally formed with the damper 7 is supported at a part 19 with the large diameter of the support post. A magnetic circuit has a plate 6 made of a magnetic body with a center hole at one magnetic pole of a permanent magnet 4 which is magnetized in a thickness direction with the center hole, and the other electrode poles also has a yoke 5 made of a magnetic body with the center hole before being fixed by a non-magnetic body post 16 through all center holes. This configuration achieves improved reliability, even if a large shock is repeated from the outside.

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 make a call when a signal is received. The present invention is used for notifying not only voice but also vibration. In particular, it can be used for the purpose of reducing the size and weight.

[0002]

2. Description of the Related Art FIG. 8 shows a conventional example on which the present invention is based. This is disclosed in Japanese Patent Application Nos. 8-31919 and 8-24026.
1, 8-240262, 8-270790, 8-324
997, 8-324998, the annular flat portion 44 to which the coil 39 is adhered is flexibly supported by the damper 43, and is adhered and fixed at the center of the magnetic circuit by the damper support portion 47. The bonding area is small, and the permanent magnet 40, yoke 41 and plate 42 of the magnetic circuit are fixed by bonding with a jig so that the centers are aligned. Therefore, it takes time and labor to assemble the magnetic circuit and the vibrating body, and there is a problem in reliability with respect to a large impact because the bonding and fixing are performed in a small area.

[0003]

SUMMARY OF THE INVENTION According to the present invention, there is provided a vibration actuator for a pager which can generate both sound and vibration by using the structure of an electroacoustic transducer having a driving coil, and it takes time and effort to assemble and secure accuracy. It is a configuration that requires no manual operation and has high reliability against strong external impacts and the like.

[0004]

In order to achieve the above object, a moving coil type vibrating body, which is conventionally used as an electro-acoustic transducer, vibrates up and down, collides with a collision portion fixed in close proximity, In a vibrating actuator for a pager that generates vibrations outside, a magnetic circuit including a permanent magnet and a vibrating body including a coil and a damper are entirely fixed at a central hole with a support column made of a non-magnetic material.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a vibration actuator for a pager according to the present invention. A part of the housing of the mobile phone is provided on the back side of the collision cover 2 corresponding to a part to be put on the ear. In FIG. 1, a moving coil type electro-acoustic transducer that generates sound is used. In order to support the center position of the vibrating body 1 and the upper and lower positions, a damper 7 that can be relatively softly displaced in the vertical direction is used. To support.

In the magnetic circuit, a magnetic plate 6 also having a central hole is provided on one magnetic pole of a permanent magnet 4 magnetized in the thickness direction having a central hole, and is formed on the other magnetic pole. A yoke 5 made of a magnetic material having a central hole is provided, and all the central holes are passed through and fixed to the support column 16. The vibrating body 1 is also fixed to the support column 16 via the damper 7. The support column 16 may be formed of metal, and the upper end 18 and the lower end 20 may be crushed by pressure to firmly fix the whole. At this time, if the upper end 18 is crushed via the metal ring 17, the portion 9 having the central hole is not broken and is fixed stably. With this configuration, reliability is maintained even when a large external impact is repeated.

A plurality of spiral dampers 7 are formed inside the vibrating annular flat portion 8, and the other end is fixed to the support column 16 at the center of the magnetic circuit to reduce the overall diameter, thereby reducing the overall diameter. When the portion 8, the damper 7, and the portion 9 having the center hole are integrally formed of resin, the structure which is soft in the vertical direction and hard in the center direction and supports the magnetic circuit can be accurately and easily formed. When having a bobbin 21 around which the coil 3 is wound,
This may also be integrally formed. Further, an annular resin molding material 12 having a plurality of claw-shaped protrusions 13 outside the outer periphery of the yoke 5 of the magnetic circuit is adhered to the collision cover 2, and the claw-shaped protrusions 13 support a rubber bottom 15 supporting the bottom of the yoke 5. Then, the magnetic circuit can be flexibly moved up and down by applying a continuous support rubber 14.

Since the plate 6 of the magnetic circuit is formed low near the center hole, the supporting column 16 for supporting the damper 7 is provided.
The large-diameter portion 19 can be provided at a position lower than the height of the plate 6, and the overall thickness can be reduced. In addition, the magnetic flux is guided to the gap formed with the yoke 5 without saturating the magnetic flux generated from the permanent magnet 4, and the weight can be reduced.

An annular gap having a large magnetic flux density is formed between the opposed yoke 5 and the plate 6 so that the coil 3 can move up and down. An elastic material 10 is provided on the fixed collision cover 2 against which the annular flat portion 8 of the vibrating body 1 to which the coil 3 is adhered collides to reduce the impact at the time of collision and suppress the generation of collision sound. In this case, the annular resin molding 12 having the claw-shaped projections 13 may be bonded to the collision cover 2, and the annular flat portion 8 may be bonded via the elastic material 10. in this case,
Instead of interposing the elastic member 10 therebetween, the annular flat portion 8 may be bonded with a sheet-like adhesive layer or an adhesive having some elasticity.

FIG. 2 shows that the magnetic circuit of the embodiment shown in FIG. 1 is displaced downward, the driving force of the coil 3 and the reaction from the magnetic circuit are applied to the coil 3, and the annular flat portion 8, the elastic material 10,
The collision force is applied to the collision cover 2 through the annular resin molding material 12.
The state given to is shown. When the frequency is as low as several tens of hertz, the collision cover 2 vibrates with a relatively large displacement amount, and generates vibration outside. On the other hand, when the frequency is as high as several hundred hertz to 3 kilohertz, the collision cover 2 vibrates with a small displacement and generates sound to the outside.

When a drive current is applied to the coil 3, FIG.
2, the vibrating body 1 in FIG. 2 is preferably set to an alternating current mainly on the polarity side which becomes the driving force in the direction of collision opposite to the permanent magnet 4. The reason for selecting the square wave 35 is to increase the level of vibration and sound. However, at the time of collision at the time of vibrating at a low frequency, unnecessary sound including a large amount of high frequency components is generated. Therefore, when the square wave 35 of the driving alternating current having one polarity is changed to 36 or 37 in which the slope of the rise and fall of the square wave is reduced, unnecessary sound can be suppressed.

FIG. 1 is a sectional view of an embodiment of the present invention. As shown in FIG. 1, the collision cover 2 does not have a plurality of holes on the vibrating body 1, and the vibrating body 1 does not directly generate sound. Since the collision cover 2 is vibrated by the reaction force of the magnetic circuit to generate sound, unlike the vibrating body 38 having a dome-shaped portion as shown in the conventional example of FIG. Not.

The actuator used in the present invention is shown in a partially cutaway perspective view in FIG. The plurality of spiral dampers 7 are provided inside the annular flat portion 8 to which the coil 3 is adhered and fixed, and the outer diameter of the yoke 5 of the magnetic circuit can be made small while the diameter of the permanent magnet 4 is relatively large. .

FIG. 6 is a perspective view of the vibration actuator for a pager according to the present invention as viewed from below, and shows a state in which the yoke 5 is fixed at the lower end 20 of the support column. The electrode wires 31 and 32 drawn from the coil are preferably connected to terminals 33 and 34.

FIG. 3 is a sectional view showing another embodiment of the vibration actuator for a pager according to the present invention. The support column 22 is formed of metal, and supports the portion 9 having a central hole integrated with the damper 7 by a large-diameter support portion 25 through the support column 22. In this configuration, the magnetic circuit and the vibrating body are fixed by suppressing the large-diameter portion 23 and deforming the lower end 24.

FIG. 4 is a sectional view of another embodiment of the vibration actuator for a pager according to the present invention. The support column 26 has a large diameter portion in the middle, supports the portion 9 having a central hole integrated with the vibrating body, suppresses the yoke 5 by the large diameter portion 30 at the lower end, and further fixes the yoke 5. The ring 29 fits into the upper end 28 of the support column 26,
If necessary, the magnetic circuit and the vibrating body are fixed and supported by bonding.

[0018]

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

In the vibration actuator for a pager of the present invention, a permanent magnet, a yoke and a plate, which constitute a magnetic circuit, and a vibrating body can be entirely fixed by a support pillar with a central hole having substantially the same diameter. Therefore, the trouble of centering in the assembling process can be omitted, and the fixing can be performed at the same time. Further, as shown in the embodiment, since the bonding step can be omitted, it can be completed in a short time.

[0020] Since it is mechanically fixed, even if a large impact is repeatedly applied from the outside, the probability of destruction is small and high reliability can be achieved. In addition, even when fixed by bonding, the bonding area can be relatively large,
Similarly, the reliability can be relatively high.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vibration actuator for a pager of the present invention.

FIG. 2 is a sectional view showing an operation state of FIG. 1;

FIG. 3 is a sectional view of another embodiment of the present invention.

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

FIG. 5 is a partial cross-sectional perspective view of an actuator used in the present invention.

FIG. 6 is a perspective view of the embodiment of FIG. 1 or FIG. 3 as viewed from below.

FIG. 7 is a diagram showing an example of a waveform of a driving current used in the present invention.

FIG. 8 is a cross-sectional view of a conventional vibration actuator for a pager on the premise of the present invention.

[Explanation of symbols]

 1, 38 Vibration body 2, 39 Impact cover 3, 40 Coil 4, 41 Permanent magnet 5, 42 Yoke 6, 43 Plate 7, 44 Damper 8, 45 Toroidal flat part 9 Part having central hole 10 Elastic material 11, 46 Yoke top 12 Annular resin molding 13 Claw-shaped projections 14, 47 Support rubber 15 Rubber bottom 16, 22, 26 Support pillar 17, 29 Ring 18, 23, 28 Upper end 19, 25, 27 Large diameter portion 20, 24, 30 Lower end 21 Bobbin 31, 32 Electrode wire 33, 34 Terminal 35 Square wave

Claims (7)

[Claims] A magnetic circuit comprising a permanent magnet and a coil;
In an electroacoustic transducer composed of a vibrating body that can move up and down,
A part that moves integrally with the vibrating body by inputting a low-frequency electric signal to the coil, when generating vibration to the outside by colliding with a fixed collision part, a part of a central hole of a magnetic circuit including the permanent magnet A vibrating actuator for a pager, wherein a portion of a center hole of the vibrating body having the coil is fixed by a non-magnetic support column. 2. The pager according to claim 1, wherein a portion of the vibrating body having an annular flat portion supporting the coil, a spiral damper portion, and the central hole is integrally formed of resin. For vibration actuator. 3. A bobbin for supporting said coil of said vibrating body, wherein a portion having an annular flat portion, a spiral damper portion and said central hole is formed by integral molding of resin. Vibration actuator for pagers. 4. The vibration actuator for a pager according to claim 1, wherein a magnetic plate having a structure in which a central hole portion is lowered is used on the permanent magnet of the magnetic circuit. 5. The vibration actuator for a pager according to claim 1, wherein a large diameter portion is provided in the middle of the support column, and upper and lower ends of the support column are deformed and fixed. 6. A large diameter portion through which the support column is passed is provided independently, and an upper end of the support column has a large diameter and a lower end is deformed and fixed. 2. A vibration actuator for a pager according to claim 1. 7. A large diameter portion through which said support column is passed is provided independently, a lower end of said support column is made to have a large diameter, and a fixing ring is fitted and fixed to an upper end thereof. Item 6. A vibration actuator for a pager according to Item 1.