JP3204899B2 - Vibration generator for small wireless pager - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator for a small wireless paging apparatus in which a vibrator is fixed to an output shaft of a motor.

[0002]

2. Description of the Related Art In recent years, as a kind of a small paging-type wireless paging apparatus, a type in which a vibration generating device in which a vibrator made of a metal having a high specific gravity is eccentrically fixed to a rotating shaft of a motor is becoming widespread. In a device incorporating such a vibration generating device, vibration is generated by the vibrator instead of generating a ringing sound, so that, for example, even when crowded or during a meeting, it is known to others. There is an advantage that reception can be confirmed without being received.

FIG . 3 and FIG. 4 show an example of a conventional vibration generator of this kind of a small-sized wireless paging device.
3 and 4, reference numeral 1 denotes a small motor connected to a signal generation circuit of a small radio, and a fan-shaped vibrator 3 is provided on a rotating shaft 2 of the motor 1. The rotating shaft 2 is inserted into a mounting hole 4 formed at a substantially central position in the diametrical direction of the sector, which is an eccentric position, and is fixed to the rotating shaft 2 by caulking at one point on the outer peripheral portion. .

Here, the conventional vibrator 3 is, for example, W
W-N such as -3Ni-2Cu (subscripts indicate weight%)
i-Cu alloy, W-1.5Ni-1Cu-0.5Fe
And a predetermined amount of W powder, Ni powder, Cu powder or Fe powder.
After appropriately mixing powders and the like, the powder was formed into the fan-shaped plate by powder metallurgy (dry press molding method), and the specific gravity was 17 to
It is made of a so-called high specific gravity metal of about 19 g / cm3. In order to fix the vibrator 3 to the rotating shaft 2 with a desired pulling strength, about 3
It is crimped and fixed with a load of 00 kgf.

According to such a vibrator 3, since the vibrator 3 is attached to the rotating shaft 2 of the motor 1 only by caulking, it has an advantage that its structure is simple and its attachment and parts management are easy. Is obtained.

[0006]

However, since the conventional vibrator 3 has a complicated shape, it is difficult to manufacture the die including press forming dies, and the yield is low. There was a problem. In addition, since the W alloy forming the vibrator 3 has a limit in toughness, there is a disadvantage that cracks are easily generated at the time of drilling the mounting hole 4 and at the time of caulking. In particular, in response to recent demands for a reduction in the size or thickness of the entire vibration generator, the casing of the motor 1 has been made smaller, and
To reduce the maximum radius of the vibrator 3
When caulking with a load of about 00 kgf, cracks in the thin caulked portion become remarkable, and a local stress acts on the rotating shaft 2 during caulking. 2 was easily deformed.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the conventional vibration generator, and is easy to manufacture and can improve the product yield. Even in such a case, a vibration generator for a small-sized wireless paging device is provided which can secure sufficient pull-out strength without generating a crack or the like at the time of drilling or caulking and can obtain a desired vibration. It is intended to do so.

[0008]

According to a first aspect of the present invention, there is provided a vibration generating apparatus for a small wireless paging apparatus according to the present invention, wherein a vibrator is fixed to a rotating shaft of a motor by caulking. A vibration generator, wherein
A bent portion extending in the radial direction of the rotation axis, and
Forming an insertion portion extending in parallel with the rotation axis;
A cylindrical vibrator is fixed to the portion .

According to the vibration generator of the small paging apparatus according to the claim 1, by fixing the vibrator to the rotation shaft the bent portion extending in a radial direction of the rotation axis is formed, the transducer Since the vibrator is mounted eccentrically from the rotation axis, the vibrator can be formed in a columnar shape, and therefore, the manufacture of the vibrator becomes extremely easy. In addition, since a mounting hole through which the rotating shaft of the motor is inserted can be formed at the center of the vibrator, there is no possibility that a crack will be generated at the time of drilling the mounting hole. Even when caulking and fixing, since a large thickness is secured in the caulked portion, no crack is generated.

Furthermore, as a result of forming the vibrator in a columnar shape,
Even when molding by a dry press molding method, it is possible to uniformly mold the density, so that a relatively long one can be easily manufactured. Therefore,
Since the contact area between the motor rotating shaft and the vibrator after fixing can be increased and the frictional force generated therebetween can be increased, it is possible to obtain a large pull-out strength with a small crimping load after all, Therefore, it is possible to further prevent the occurrence of cracks during swaging.

In particular, a bent portion extending radially from the rotating shaft and an insertion portion extending from the bent portion in parallel with the rotation axis are formed, and the vibrator is fixed to the inserted portion. Even when a vibrator having a large length is used, the radius of rotation at the vibrator tip does not increase, and the whole vibration generator can be reduced in size. Force acts
Nothing.

[0012]

1 and 2 show an embodiment of a vibration generator for a small-sized radio paging device according to the present invention. In these figures, reference numeral 1 indicates a motor. In this motor 1, a rotating shaft 2 integrated with a coil assembly 5 is rotatably provided via a bearing 6, and a stator magnet 7 is fixed to the inner wall surface of the casing 1a with a small gap from the coil assembly 5. In addition, a lead wire 9 connected to a signal generation circuit of the small-sized wireless paging device is connected to a brush 8 that slides on a terminal of the coil assembly 5. Here, the rotating shaft 2 has a base portion protruding from the motor 1, a bent portion 2 a extending in a radial direction perpendicular to the rotation axis of the rotation shaft 2, and a parallel portion extending from the bent portion 2 a with the rotation axis. The vibrator 10 is fixed to the insertion portion 2b.

The vibrator 10 is formed of a W-Ni-Cu alloy in a columnar shape, and has a mounting hole 11 in the center of which a rotary shaft 2 of the motor 1 is inserted. As shown in the figure, the vibrator 10 is configured such that the rotating shaft 2 of the motor 1 is inserted into the insertion portion 2b, and is caulked at a plurality of portions in the axial direction on the outer peripheral portion. Fixed to.

According to the vibration generator of such a small-sized wireless paging device, the vibrator 10 is connected to the bent portion 2a of the rotating shaft 2.
Since the rotor 10 is fixed to the insertion portion 2b at an eccentric position from the rotation axis, a cylindrical member can be used as the rotor 10, so that the manufacture of the vibrator 10 itself becomes extremely easy. In addition, since the mounting hole 11 through which the rotary shaft 2 is inserted is formed at the center of the vibrator 10, drilling of the mounting hole 11 is easy, and there is no possibility of cracking during processing. In addition, even when the vibrator 10 is crimped and fixed to the rotating shaft 2, cracks do not occur because a large thickness is secured in the crimped portion.

Further, as a result of forming the vibrator 10 in a cylindrical shape, when the vibrator 10 is formed by a dry press forming method,
Since the density can be formed uniformly, it is possible to easily manufacture a product having a relatively long length, thereby increasing the contact area between the rotating shaft 2 of the motor 1 and the vibrator 10 after fixing. As a result, the frictional force generated between them can be increased, so that a large pull-out strength can be finally obtained with a small crimping load, so that the occurrence of cracks at the time of crimping can be further prevented. .

Further, since the insertion portion 2b of the rotating shaft 2 to which the vibrator 10 is fixed is formed parallel to the rotational axis, even when the vibrator 10 having a large length is used, The radius of rotation at the tip of the vibrator 10 does not become large, the size of the entire vibration generator can be reduced, and no force acts on the vibrator 10 in the direction coming out of the rotary shaft 2.

[0017]

As described in the foregoing, according to the vibration generator of the small paging device of the serial <br/> mounting to the claim 1, the rotation shaft the bent portion extending in a radial direction of the rotation axis is formed As a result, the vibrator can be formed in a columnar shape as a result of mounting the vibrator eccentrically from the rotation axis, thereby making it extremely easy to manufacture the vibrator and drilling a mounting hole at the center of the vibrator. Therefore, there is no risk of cracking during the drilling of the mounting hole, and no cracking is caused even at the time of caulking to the rotating shaft due to the large thickness of the caulked portion. Also, when forming the vibrator by a dry press molding method, it is possible to easily manufacture a vibrator having a relatively long length, so that the contact area between the rotating shaft and the vibrator is increased and the vibrator is formed between the vibrators. Since the generated frictional force can be increased, it is possible to obtain a large pull-out strength with a small caulking load after all,
Therefore, it is possible to further prevent the occurrence of cracks during swaging.

In particular, since the vibrator is fixed to the insertion portion extending in parallel with the rotation axis of the rotation shaft, even when a vibrator having a large length is used, the radius of rotation at the tip of the vibrator is small. It is possible to reduce the size of the entire vibration generating device without increasing the size, and to obtain an effect that no force is applied to the vibrator in a direction of coming out of the rotating shaft.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a vibration generating device of a small wireless paging device of the present invention.

FIG. 2 is a left side view of FIG.

FIG. 3 is a vertical view showing a state in which a conventional vibrator is attached to a motor.
It is sectional drawing.

FIG. 4 is a front view showing the shape of the vibrator of FIG . 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Motor rotating shaft 2a Bending part 2b Inserting part 10 Vibrator 11 Mounting hole

Claims (1)

(57) [Claims] 1. A vibration generator for a small-sized wireless paging device in which a vibrator is fixed to a rotating shaft of a motor by caulking, wherein the rotating shaft has a bend extending in a radial direction of a rotating axis.
Part and an insertion extending from the bent part in parallel with the rotation axis.
And a cylindrical vibrator fixed to the insertion portion .