JP3633074B2 - Vibrator for vibration generator of small wireless paging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibrator that is attached to a vibration generator of a small wireless caller.
[0002]
[Prior art]
In recent years, as a kind of paging-type small wireless caller, a type in which a vibration generator in which a vibrator made of a high specific gravity metal is eccentrically fixed is built in a rotating shaft of a motor is becoming widespread.
For devices incorporating such a vibration generator, instead of making a ringing tone, vibration is generated by the vibrator, so that other people can know, for example, in crowds or during meetings. There is an advantage that reception can be confirmed without being performed.
[0003]
2 and 3 show an example of a vibration generating apparatus to which a conventional vibrator of this type is attached.
2 and 3, reference numeral 1 in the drawing denotes a small motor connected to a signal generation circuit of a small wireless device. A rotating plate 2 of the motor 1 has a fan-shaped plate vibration generator. (Hereinafter abbreviated as “vibrator”) 3 is inserted into the mounting hole 4 formed at a substantially central position in the diametrical direction of the sector, which is the eccentric position, and at a point on the outer peripheral portion. It is being fixed to the said rotating shaft 2 by crimping.
Here, the conventional vibrator 3 is, for example, a W—Ni—Cu alloy such as W-3Ni-2Cu (subscript indicates weight%), or W-1.5Ni-1Cu-0.5Fe (same). W-Ni-Cu-Fe alloy and the like, and after a predetermined amount of W powder, Ni powder, Cu powder, Fe powder, etc. are appropriately mixed, the above-mentioned sector plate is obtained by powder metallurgy (dry press molding method). It is made of a so-called high specific gravity metal having a specific gravity of about 17 to 19 g / cm ³ . The vibrator 3 is fixed by being caulked with a load of about 300 kgf at one point on its outer peripheral portion in order to fix the vibrator 3 to the rotating shaft 2 with a desired pulling strength.
[0004]
According to such a vibrator 3, since it is attached to the rotating shaft 2 of the motor 1 only by caulking it, there is an advantage that the structure is simple and the attachment and component management are easy. .
[0005]
[Problems to be solved by the invention]
However, the above-described conventional vibrator 3 has a problem that the shape thereof is complicated, so that it is difficult to manufacture, including the production of a press mold, and the yield is poor.
In addition, the W alloy forming the vibrator 3 has a drawback in that cracks are likely to occur during caulking because of its limited toughness. In particular, in response to the recent demand for downsizing or thinning of the entire vibration generator, when the diameter of the casing of the motor 1 is made smaller and the maximum radius of the vibrator 3 is also made smaller, the vibrator 3 is about 300 kgf. Generation of cracks in the thin-walled caulking portion becomes noticeable, and local stress acts on the rotating shaft 2 during caulking. There was a problem that it was easily deformed.
[0006]
The present invention has been made to effectively solve the problems of the above-described conventional vibrators, can be easily manufactured and can improve the product yield, and especially when the motor is downsized, its rotation A vibrator for a vibration generating device of a small wireless paging machine capable of ensuring sufficient pull-out strength and obtaining a desired vibration without causing cracks or the like in the caulking portion when being fixed to the shaft. Is intended to provide.
[0007]
[Means for Solving the Problems]
Vibration generator oscillator for small radio paging apparatus according to the present invention described in claim 1 is formed in a columnar shape, and a mounting hole rotary shaft is inserted in the motor of the vibration generator at its eccentric position puncture It is characterized by being provided .
[0008]
Here, in the invention described in claim 2, the mounting hole according to claim 1 is located on one outer peripheral side of the axis in the cut surface including the mounting hole and the axis, and the rotating shaft It is characterized in that it is formed so as to be gradually inclined toward the outer peripheral side from the proximal end side to the distal end side.
[0009]
According to the vibrator for the vibration generating device of the small wireless calling device according to the first or second aspect, since the shape is a columnar shape, the manufacturing becomes extremely easy.
In particular, in the invention described in claim 2, the mounting hole is located on one outer peripheral side of the axis, and is gradually inclined toward the outer peripheral side from the proximal end side to the distal end side of the rotating shaft. As a result, the amount of eccentricity is increased and a desired amount of vibration is obtained, and a large thickness is secured at the caulking portion on the base end side of the rotating shaft, so that cracks may occur during caulking. It becomes possible to prevent.
In addition, as a result of tilting the mounting hole, the contact area between the motor rotating shaft and the vibrator after fixing increases, so that the frictional force generated between them increases, and therefore small caulking. Since a large pulling strength can be obtained by the load, it is possible to further prevent the occurrence of cracks during caulking.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a state in which an embodiment of a vibrator for a vibration generating device of a small wireless caller according to the present invention is attached to a rotating shaft 2 of a motor 1. Incidentally, in the figure, reference numeral 5 is a stator magnet disposed in the casing 1a, 6 is a coil assembly, 7 is a commuter, 8 is a brush, and 9 is a lead wire connected to the signal generating circuit of the above small wireless caller. Each is shown.
In these drawings, the vibrator 10 is formed in a cylindrical shape by a W—Ni—Cu alloy, and an attachment hole 11 into which the rotating shaft 2 of the motor 1 is inserted is formed at an eccentric position thereof. .
[0011]
Here, the mounting hole 11 is formed so as to be positioned closer to one outer periphery 10 a side than the axis O in the cut surface 12 including the mounting hole 11 and the axis O. Further, the mounting hole 11 has an end portion 11a on the proximal end side of the rotating shaft 2 positioned near the axis O, and an end portion 11b on the other end side of the rotating shaft 2 on the outer peripheral 10a side of the vibrator 10. It is perforated so that it may incline to the outer peripheral side gradually from the said edge part 11a toward the edge part 11b so that it may be located in this.
As shown in FIG. 1, the vibrator 10 having the above configuration is configured such that the rotating shaft 2 of the motor 1 is inserted into the mounting hole 11 and crimped at a plurality of locations in the axial direction on the outer peripheral portion. It is fixed to the rotating shaft and used as a vibration generator.
[0012]
According to the vibrator 10 as described above, since its shape is cylindrical, it is very easy to manufacture.
In addition, the mounting hole 11 is drilled so as to be positioned closer to the outer periphery 10a than the axis O, and gradually from the proximal end 11a to the distal end 11b of the rotating shaft 2. Since the hole is inclined at the outer peripheral side, a large amount of eccentricity can be secured, so that a desired amount of vibration can be obtained, and a large thickness is applied to the crimped portion on the base end side of the rotating shaft 2. Since it can be ensured, it is possible to reliably prevent cracks from being generated during drilling of the mounting hole 11 or during caulking.
[0013]
Moreover, since the mounting hole 11 is inclined and drilled, the contact area between the rotating shaft 2 of the motor 1 and the vibrator 10 after fixing increases, so that the frictional force generated between them increases. Therefore, since a large pulling strength can be obtained with a small caulking load, the occurrence of cracks during caulking can be further prevented from this viewpoint.
[0014]
【Example】
Next, an experiment for comparing the amount of vibration generated between the vibrator 10 according to the present invention shown in FIG. 1 and the conventional vibrator 3 shown in FIGS. 2 and 3 was performed.
First, as a vibrator 10 according to the present invention, a vibrator having a cylindrical shape with an outer diameter of 3 mm and a length of 5 mm and having a specific gravity of 12 g / cm ³ made of W—Ni—Cu was prepared. Here, in the vibrator 10, an end portion 11a on the proximal end side of the rotating shaft 2 is separated from the axis O by 0.5 mm, and an end portion 11b on the distal end side of the rotating shaft 2 is 1.0 mm from the axis O. A mounting hole 11 having a diameter of 0.8φ was formed.
Moreover, as the conventional fan-shaped vibrator 3 shown in FIG. 3, the maximum radius from the axis of the mounting hole 4 to the outer periphery is 3.4 mm, the length is 4.6 mm, and the material is W-Ni. A vibrator having a specific gravity of 18 g / cm ^{3 made} of Cu was prepared.
Next, these vibrators were attached to a single 1.5v drive motor, and acceleration was measured with a vibrometer to compare the performance of both vibrators.
As a result, the vibrator according to the present invention has a maximum of 10.1 G, whereas the conventional vibrator has a maximum of 8.8 G. Therefore, the vibrator according to the present invention has a specific gravity of the related art. It has been found that a larger amount of vibration can be obtained even though it is smaller than the above.
[0015]
【The invention's effect】
As described above, according to the vibrator for the vibration generating device of the small wireless paging device according to the first or second aspect, since the shape is cylindrical, the manufacturing becomes extremely easy. According to the invention described in 2, the eccentric amount is increased to obtain a desired vibration amount, and further, a large thickness is secured in the caulking portion on the proximal end side of the rotating shaft, and the motor is rotated after being fixed. Since the frictional force generated between the shaft and the vibrator becomes large, it is possible to obtain a large pulling strength with a small caulking load, and therefore, it is possible to prevent the occurrence of cracks during caulking. can get.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which an embodiment of a vibrator for a vibration generating device of a small wireless caller according to the present invention is attached to a motor.
FIG. 2 is a longitudinal sectional view showing a state where a conventional vibrator is attached to a motor.
FIG. 3 is a front view showing the shape of the vibrator of FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motor 2 Motor rotating shaft 10 Vibrator 10a Outer periphery 11 Mounting hole O Axis

Claims (2)

A vibrator for a vibration generating device of a small wireless caller that is eccentrically fixed to a rotating shaft of a motor by caulking,
A vibrator for a vibration generating device of a small wireless paging machine, characterized in that the vibrator is formed in a cylindrical shape, and an attachment hole into which the rotating shaft of the motor is inserted is formed at an eccentric position thereof. The mounting hole is located on one outer peripheral side of the axis on the cut surface including the mounting hole and the axis, and is gradually inclined toward the outer peripheral side from the motor side to the tip side of the rotating shaft. The vibrator for a vibration generating device of a small wireless paging device according to claim 1, wherein the vibrator is provided.

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