JP2000083347A - Oscillation generator for small radio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oscillation generator for small radio, in which oscillation efficiency can be enhanced by acting the eccentric load of an oscillator efficiently while enhancing productivity of the oscillator and the entire oscillation generator. SOLUTION: The oscillation generator for small radio comprises an oscillator 3, which is coupled integrally with a rotary shaft 2 of a motor where a groove 3B to be fitted with the rotary shaft 2 is made in the oscillator 3 and at least the exposed part of the rotary shaft 2 fitted in groove 3B is caulked to couple the oscillator 3 integrally with the rotary shaft 2. Since the oscillator 3 does not require special parts for caulking, as compared with a case where the oscillator 3 is caulked, oscillation efficiency can be improved by causing the eccentric load of the oscillator 3 to act effectively, and the specific gravity of the oscillator 3 can be high without significantly taking into account the toughness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration generator used for calling a small radio such as a portable telephone.

[0002]

2. Description of the Related Art In recent years, as a kind of a small paging type wireless paging device, a type having a built-in vibration generator in which a vibrator made of a high specific gravity metal is eccentrically coupled to a rotating shaft of a motor has been widely used. It is getting. A small wireless paging device incorporating such a vibration generating device generates vibration by rotating the vibrator instead of generating a ringing sound, so that it is known to others, for example, even when crowded or during a meeting. Can be confirmed without receiving.

Conventionally, as shown in FIG. 26 and FIG. 27, a vibration generator of this kind for a small radio is provided with a vibrator 10 on a rotating shaft 2 of a small motor 1 connected to a signal generation circuit of the small radio. Are integrally combined. The vibrator 10 is made of a metal having a high specific gravity formed by a powder metallurgy method. A boss portion 10B is integrally formed at a center portion of an eccentric load portion 10A having a substantially fan-shaped plane, and the boss portion 10B has a rotating shaft. 2 is formed with a mounting hole 10C into which the hole 2 is inserted. When connecting the rotating shaft 2 and the vibrator 10, the rotating shaft 2 is inserted into the mounting hole 10C and then the boss 10B
Is plastically deformed by caulking from the direction of arrow P1 or P2 in FIG. Due to the plastic deformation of the boss 10B,
The boss 10B and the rotating shaft 2 are in close contact with each other, and the rotating shaft 2 and the vibrator 10 are integrally connected.

[0004]

In the above-described conventional vibration generator, the vibrator 10 itself is caulked and directly connected to the rotating shaft 2, so that the number of parts is reduced by eliminating the need for an adhesive or other connecting parts. Although possible, there were the following problems. In other words, the boss 10B swaged in the direction of the arrow P1 is located above the rotary shaft 2 with respect to the eccentric load 10A located below the rotary shaft 2 in FIG. Boss part 10 on opposite side of 10A
Since the portion B is located, the eccentric action of the eccentric load portion 10A is reduced correspondingly, and the vibration efficiency is deteriorated. Further, since the vibrator 10 which is a powder molded product has brittleness in its material, cracks easily occur when caulked, and the vibrator 10 is manufactured so as to satisfy the required high specific gravity and toughness. It was difficult to set conditions. Further, since the boss portion 10B of the vibrator 10 must be formed in a small cylindrical shape and the mounting hole 10C is formed therein, when the vibrator 10 is formed by pressing the powdery raw material, particularly, the boss portion 10B is formed. There is also a problem that it is difficult to fill the mold portion with the powder raw material, and the yield of the vibrator 10 is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the vibration efficiency by efficiently applying the eccentric load of the vibrator, and to improve the vibration of a small radio device capable of improving the productivity of the vibrator and the whole device. A generator is provided.

[0006]

According to a first aspect of the present invention, there is provided a vibration generator for a small wireless device, wherein a vibrator is integrally connected to a rotating shaft of a motor. Is formed, and at least an exposed portion of the rotating shaft fitted into the groove is swaged to be integrally connected to the rotating shaft.

[0007] The invention described in claim 2 is the first invention.
Is characterized in that the vibrator is integrally coupled to the rotary shaft by caulking a portion near the groove in addition to the rotary shaft. Further, according to a third aspect of the present invention, in the first or the second aspect, the groove of the vibrator is formed to have a size having a range of a central angle of 180 ° or more of the rotation shaft. It is a feature. According to a fourth aspect of the present invention, in the first or second aspect, when the distal end portion of the caulking punch crushes the rotary shaft, the distal end of the punch abuts on the rotary shaft to suppress the warp of the rotary shaft. A suppressing portion is provided on the crimping punch. According to a fifth aspect of the present invention, in the first or second aspect, the vibrator is formed in a column shape having a substantially fan-shaped cross section, and a cutout is formed in a linear side surface of the vibrator. It is characterized by having. Further, according to a sixth aspect of the present invention, in the third aspect, a ratio (W4 / D) of an opening width W4 of the groove of the vibrator to a diameter D of the rotating shaft of the motor is 0.8.
It is characterized in that it is set to be in the range of 3 to 0.98.

According to the vibration generator of the present invention, the exposed portion of the rotating shaft fitted into the groove of the vibrator is swaged to integrally connect the rotating shaft and the vibrator. Eliminating the need to form a special part for caulking the vibrator, improving the vibration efficiency and increasing the specific gravity of the vibrator, reducing the size and weight of the vibrator, Achieve small size, light weight and low cost. In addition, by reducing the caulking load and eliminating the occurrence of cracks in the vibrator, the productivity of the vibration generator is improved, and the shape of the portion of the vibrator connected to the rotating shaft is simplified, so that Improve productivity and yield.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS.
FIG. 3 is a diagram for explaining the first embodiment of the present invention and a modification example thereof. In the vibration generator for a small wireless device according to the present embodiment, a vibrator 3 having a shape as shown in FIGS. 1 and 2 is integrally formed with a rotating shaft 2 of a small motor (motor) 1 in the conventional example described above. It has a combined configuration. The vibrator 3 is made of a metal having a high specific gravity formed by powder metallurgy, has a substantially semi-cylindrical shape centered on the axis O, and the entire fan-shaped portion eccentric from the axis O serves as an eccentric load portion 3A. ing. Reference numeral 3B denotes a groove having a substantially semicircular cross section extending along the axis O, and has an inner diameter into which the rotating shaft 2 made of steel having a circular cross section fits. A side edge 3C of the groove 3B,
3C is swelled downward from the axis O in FIG.
B is formed over a range of 180 ° or more around the axis O. Therefore, the rotating shaft 2 is provided in the groove 3B.
Is included in the range of 180 ° or more.
Outer surface 3C ₁ located on the opposite side of the groove 3B in the side edge portion 3C is formed in a circular arc shape which is recessed to eccentric load portion 3A side. The radius of the arc of the outer surface 3C ₁ is set to, for example, a bulging height and the same dimension of the side edge portion 3C. Outer surface 3C ₁ this arcuate, when the side edge portion 3C is crushed contributes to cracking due to stress concentration on the root side of the side edge portion 3C on the outer surface 3C ₁ is to prevent the occurrence .

When connecting the rotating shaft 2 and the vibrator 3, first, the rotating shaft 2 is fitted into the groove 3B of the vibrator 3 from the direction of the axis O, and the vibrator 3 is connected to the vibrator 3 in FIGS. Positioning is performed by a receiving jig 4 as shown in FIG. The receiving jig 4 is formed with an arc-shaped surface portion 4A that is in surface contact with the arc-shaped outer peripheral surface 3D of the vibrator 3. Reference numeral 4B denotes a stopper for preventing the vibrator 3 from rotating about the axis O.

The crimping punch 5 has a front end 5A formed of a horizontal surface portion (suppression portion) 5B and a ridge projecting downward at the center of the horizontal surface portion 5B. The tip portion 5A is formed in the shape of a truncated quadrangular pyramid that has an elongated rectangular cross section and gradually expands upward. As shown in FIGS. 5 and 6, the tip 5A of the crimping punch 5 exposes the rotating shaft 2 located in the groove 3B from the exposed portion, that is, the groove 3B to the upper part in FIGS. The portion of the rotating shaft 2 to be pressed is crushed downward over a predetermined range and caulked. Here, when the distal end portion 5A of the caulking punch 5 crushes a predetermined range of the rotating shaft 2, the other portion of the rotating shaft 2 warps upward due to the reaction, as shown in FIG.
As shown in (1), the horizontal surface portion 5B of the crimping punch 5 is in contact with the upper side of the rotating shaft 2 to prevent the rotating shaft 2 from being pressed. The rotating shaft 2 crimped in this manner is plastically deformed as shown in FIG. 7, and is integrally connected to the vibrator 3 in close contact with the inner surface of the groove 3B.

As described above, the rotating shaft 2 and the vibrator 3 are coupled by directly caulking the exposed portion of the rotating shaft 2 located in the groove portion 3B. There is no need to specially form the part. Therefore, it is not necessary to extend the vibrator 3 to a position above the rotary shaft 2 in FIG. 7, that is, it is not necessary to extend the vibrator 3 on the opposite side of the eccentric load portion 3A, which is required. As compared with the case, the eccentric load of the eccentric load portion 3A acts effectively, and the vibration efficiency is improved. Further, since the rotating shaft 2 made of steel is swaged, no crack occurs when the vibrator 3 which is a powder molded product is swaged, and the swaging load is smaller than that when the vibrator 3 is swaged. .

Further, with respect to the vibrator 3, the specific gravity can be increased by increasing the content of tungsten (W) without considering the toughness so much, and the manufacturing conditions can be easily set. By improving the vibration efficiency and increasing the specific gravity of the vibrator, it is possible to reduce the size and weight of the vibrator 3 and to reduce the size, weight, and cost of the vibration generator and the small wireless device as a whole. Further, since the portion of the vibrator 3 that is connected to the rotating shaft 2 has a simple shape in which a groove 3B that is opened upward in FIG. 7 is formed. In addition, the powder material can be easily filled into the mold, the press moldability is stabilized, and the yield is improved.

Incidentally, as the rotating shaft 2, for example, S
A stainless steel material such as US420 can be used. The vibrator 3 is made of, for example, a W-Ni-based or W-Ni-F
e-based, W-Ni-Cu-based, or W-Mo-Ni-F
It is formed by a powder metallurgy method using a super-polymerized gold material having a specific gravity of about 17 to 19, such as e type. Specific examples include W powder; 89 to 98% by weight and Ni powder;
A mixed powder having a composition of 1.0 to 11% by weight, or a W powder and a Ni powder in the range of the above weight%, Cu;
0.1-6% by weight, Fe powder; 0.1-6% by weight, Mo
Powder; 0.1-6% by weight, and Co powder; 0.1-5
A powder mixture having a composition containing 1% or 2% by weight of a composition is molded into a fan shape at ¹ ton / cm ² to ⁴ ton / cm ² , and the green compact is dew point of 0 ° C. to −60 ° C. Liquid phase sintering in a hydrogen stream or ammonia decomposition gas, and further heating in a temperature range of 700 ° C. to 1430 ° C. ± 30 ° C. in any of vacuum, neutral or reducing atmosphere, at least The heat treatment is performed to rapidly cool to 300 ° C. at a cooling rate of 40 ° C./min or more.

In such a composition of the oscillator 3, W
When the content of (tungsten) exceeds 98% by weight, the malleability is lowered but the specific gravity is increased. When the content is less than 89% by weight, the specific gravity cannot be obtained, which is inconvenient for this type of vibrator. Become. Also, when the content of Ni (nickel) exceeds 11% by weight, a predetermined specific gravity cannot be obtained, and when the content is less than 1.0% by weight, sinterability does not progress. Further, although Co (cobalt) has the same effect as Ni,
If it is less than 5% by weight, the effect of sufficient addition cannot be obtained. On the other hand, if it exceeds 5% by weight, a corresponding effect cannot be obtained, which is uneconomical in production. Although the sintering temperature of the Cu powder and the Fe powder can be lowered by containing them, the specific gravity cannot be obtained at the above-mentioned upper limit or more.

Further, specific examples of dimensions of the rotating shaft 2 and the vibrator 3 are as follows. The diameter D of the rotating shaft 2 is 0.8 mm, the outer diameter R1 of the vibrator 3 is 3.0 mm, the length L1 of the vibrator 3 is 4.6 mm, and the inner diameter R2 of the groove 3B is 0.4 mm.
4 mm, height H1 of side edge 3C is 0.2 mm, side edge 3
The width W1 of the formation region of C and 3C is 2.5 mm. The tip 5A of the crimping punch 5 has a height H2.
Is 0.3 mm, the tip width W2 is 0.2 mm, the base width W3 is 0.27 mm, the length L2 is 2 mm, and the inclination angles θ1 and θ2 of both side portions and both end portions are 40 °.

In the first embodiment, the rotary shaft 2 is fitted into the groove 3B of the vibrator 3 from the direction of the axis O before swaging by the swaging punch 5, but instead of the rotary shaft, 2 may be pushed into the groove 3B from above. According to this method, the working speed can be increased and the working efficiency can be improved. When this method is used, as shown in FIG. 8, the ratio of the opening width W4 of the groove 3B to the diameter D of the rotating shaft 2 (W4 / D) is 0.83 to 0.9.
It is good to set it so that it is in the range of 8. In particular,
The opening width W4 of the groove 3B is set so that the diameter D of the rotating shaft 2 is 1.00.
0.87 ~ 0.97mm, 0.80mm
In the case of (1), it is preferable to set the range of 0.70 to 0.78 mm, and in the case of 0.60 mm, the range is set to 0.50 to 0.58 mm. If it is smaller than this range, the rotating shaft 2 will be grooved 3B.
It is difficult to push the inside of the groove, and if it is large, the adhesion between the rotating shaft 2 and the inner surface of the groove 3B is insufficient, and the bonding strength may be insufficient. Both side edges 31, 31 of the opening are subjected to small rounding and chamfering, respectively.

FIGS. 9 and 10 are views for explaining a modified example of the vibrator 3 in the present embodiment. FIG.
As shown in (a), an arc-shaped arc surface 3E that is recessed toward the eccentric load portion 3A from the opening-side end surface of the groove 3B in the side edge portion 3C toward the arc-shaped outer peripheral surface 3D is formed.
In FIG. 7A, an arc surface bulging outward from the eccentric load portion 3A may be used instead of the arcuate arc surface 3E depressed toward the eccentric load portion 3A. Also, FIG.
As shown in, as in the first embodiment, when crushing the side edges 3C serves to prevent cracking due to stress concentration occurring on the root side of the side edge portion 3C on the outer surface 3C ₁ as such, the outer surface 3C ₁ is formed in a circular arc shape, between the outer surface 3C ₁ and the outer peripheral surface 3D, horizontal 3F located in the lower side in the figure of the axis line O is formed. Further, the one shown in FIG. 3C is formed in a shape in which the side edge 3C extends to a position near the outer peripheral surface 3D. On the other hand, FIG.
As shown in (a), the outer surfaces 3C ₂ of the side edge portion 3C is set to a direction parallel to and the axis O and parallel to the plane towards the bottom side from the opening side of the groove 3B, the outer surfaces 3C ₂ and the outer peripheral Surface 3D
3G is formed between the two, and these joints serve to prevent cracks due to stress concentration at the joints when the side edge 3C is crushed. , Rounded, and formed into a circular arc depressed toward the eccentric load portion 3A side. Also, those shown in (b), the figure (a) in the same manner as the outer surface 3C ₂ is formed, FIG. (B) middle groove portion 3 between the outer surface 3C ₂ and the outer peripheral surface 3D
With the horizontal plane 3H is formed located at the bottom and substantially the same height B, the connecting portion between the outer surface 3C ₂ and the horizontal plane 3H, similar to FIG. (A), crushing the side edges 3C In this case, in order to prevent the occurrence of cracks due to stress concentration at the joint portion, the joint portion is formed in an arc shape depressed toward the eccentric load portion 3A. Further, the one shown in FIG. 3C is formed in a shape in which the side edge portion 3C extends as an inclined surface to the outer peripheral surface 3D.

FIG. 11 is a view for explaining another modification of the vibrator 3 in the present embodiment. FIG. 3A shows a cutout groove having a substantially semicircular cross section along an axis O on an outer surface 3I, 3I between a side edge 3C of an eccentric load portion 3A and an arc-shaped outer peripheral surface 3D. (Notches) 3J and 3J are formed, and as shown in FIG. 3B, cutout grooves (notches) 3K and 3K having a triangular cross section are formed on the outer surfaces 3I and 3I along the axis O. c) shows the outer surface 3I, 3I with the axis O
Are formed in the shape of cutout grooves (notches) 3L, 3L each having a rectangular cross section along the line. Thus, the eccentric load portion 3A
If the notched grooves 3J, 3K, 3L are formed at positions near the axis O, the center of the eccentric load will be further away from the axis O, so that the eccentric load is effectively applied while reducing the weight of the vibrator 3. And the vibration efficiency can be improved.

FIGS. 12 to 15 are views for explaining still another modification of the vibrator 3 in the present embodiment. Both end faces 3M of the vibrator 3 shown in FIG. 12 and FIG.
3M is formed with a fitting recess 3N into which the bearing of the small motor is fitted. 14 and FIG.
Fitting recesses 3Q, 3Q into which the bearings of the small motor are fitted are formed on both end faces 3P, 3P of the vibrator 3 shown in FIG. According to such a vibrator 3, when the small motor 1 and the vibrator 3 are integrated, the dimension in the direction of the axis O can be reduced. The fitting recesses 3N, 3Q
May be provided only on one end face 3M, 3P.

FIG. 16 is a view for explaining a modification of the groove 3B of the vibrator 3 in this embodiment. In the case of FIG. 7A, the side edge of the groove having a rectangular cross section is narrowed inward, and in the case of FIG. 7B, the side edge of the groove having a substantially pentagonal cross section is narrowed inward. And in the case of FIG.
The groove is shaped like a letter, and in the case of FIG. The rotating shaft 2 can be crimped and connected to any of these grooves 3B.

(Second Embodiment) FIGS. 17 to 21 are views for explaining a second embodiment of the present invention and its modifications. In the case of the present embodiment, as shown in FIG. 17, the rotating shaft 2 and the vibrator 3 in the above-described first embodiment are caulked together, so that the rotating shaft 2
And the vibrator 3 are integrally connected. That is, as shown in FIG. 18, the crimping punch 5 has
Two end portions 5D and 5D crossing the horizontal surface portion (suppression portion) 5C and the groove portion 3B are formed, and these end portions 5D and 5D form the rotating shaft 2 as shown in FIGS. And two side edges 3C, 3C of the groove 3B.
Are caulked at the same time. The hatched portion in FIG. 19 is a caulked portion. In this manner, by caulking the side edge 3C as a portion near the groove 3B together with the rotating shaft 2, the rotating shaft 2 and the vibrator 3 are more securely coupled together with plastic deformation. become. When the tip 5D of the caulking punch 5 crushes a predetermined range of the rotating shaft 2, the other part of the rotating shaft 2 warps upward due to the reaction. Are in contact with the upper surface of the rotating shaft 2 to prevent the rotating shaft 2 from being pressed.

FIGS. 20 and 21 are explanatory views of a modified example of the present embodiment. As shown in FIG. 20, a crimping punch 5 having one tip 5C is used to move the rotary shaft 2 at one location. And two places of the side edges 3C and 3C of the groove 3B are simultaneously caulked. The hatched portion in FIG. 21 is a caulked portion. Even by such crimping, the rotating shaft 2 and the vibrator 3 can be securely connected.

(Third Embodiment) FIGS. 22 and 23
FIG. 7 is a diagram for explaining a third embodiment of the present invention. In the case of the present embodiment, the crimping punch 5 has, at the tip thereof, two horizontal end portions 5F and 5F each composed of a horizontal surface portion (suppression portion) 5E and a ridge projecting downward from the horizontal surface portion 5E. Are formed side by side along the axis O. And, by the tip portions 5F, 5F of this caulking punch 5,
Both upper side portions of the rotating shaft 2 exposed from the inside of the groove 3B are crushed downward and crimped. Here, when the distal ends 5F, 5F of the caulking punch 5 crush the predetermined range of the rotary shaft 2, the other part of the rotary shaft 2 warps upward due to the reaction thereof. The horizontal surface portion 5E of the caulking punch 5 positioned between the rotating shaft 2 and the rotating shaft 2
It is prevented by holding down. The rotating shaft 2 crimped in this manner is tightly attached to the inner surface of the groove 3B and is integrally connected to the vibrator 3.

(Fourth Embodiment) FIGS. 24 and 25
FIG. 9 is a diagram for explaining a fourth embodiment of the present invention. In the case of this embodiment, the tip 5 of the crimping punch 5
By F and 5F, both upper side surfaces of the rotating shaft 2 exposed from the inside of the groove 3B and both side edges 3C and 3C of the groove 3B are simultaneously crushed, and the rotating shaft 2 and the vibrator 3 are caulked together. As a result, the rotating shaft 2 and the vibrator 3 are integrally connected. Here, when the rotating shaft 2 is warped when being crushed by the caulking punch 5, the horizontal surface portion 5E of the caulking punch 5 located between the distal end portions 5F and 5F rotates similarly to the third embodiment. It is prevented by contacting the upper side of the shaft 2 and pressing the rotating shaft 2. Thus, the groove 3 is formed together with the upper side portions of the rotating shaft 2.
By caulking the side edge portion 3C as a portion in the vicinity of B, the rotating shaft 2 and the vibrator 3 are more securely joined together with plastic deformation.

[0026]

As described above, according to any one of the first to sixth aspects of the present invention, the exposed portion of the rotary shaft fitted into the groove of the vibrator is swaged to secure the rotary shaft and the vibrator. Because it is integrated, there is no need to form a special part for caulking the vibrator as compared with caulking the vibrator, so the eccentric load of the vibrator works effectively and vibration efficiency In addition, the specific gravity of the vibrator can be increased without considering the toughness so much. As a result, the vibrator can be reduced in size and weight, and as a result, the vibration generator and the overall size of the small radio can be reduced. Small size, light weight and low cost can be realized. In addition, compared with the case where the vibrator is crimped, the crimping load of the rotating shaft can be reduced, and the crack of the vibrator does not occur, so that the productivity of the vibration generator can be improved. Furthermore, since the connecting portion of the vibrator with the rotating shaft has a simple shape with a groove,
It is also possible to improve the productivity and yield of the vibrator.

According to the second aspect of the present invention, by caulking a portion of the vibrator in the vicinity of the groove together with the rotating shaft, plastic deformation of the rotating shaft and the vibrator can be performed more firmly. Can be combined. Further, according to the third aspect of the invention, the central angle of the rotating shaft is 180 °.
By forming the groove portion of the vibrator so that the above range is included, an effect is obtained in which the rotating shaft can be more securely restrained in the groove portion of the vibrator and the coupling strength thereof can be further increased. According to the fourth aspect of the present invention, the warp of the rotating shaft at the time of caulking can be suppressed by the suppressing portion. According to the fifth aspect of the present invention, the vibrator is formed in a column shape having a substantially fan-shaped cross section, and the notch is formed in the linear side surface of the vibrator, so that the center of the eccentric load is from the axis. Since the distance is further increased, the eccentric load can be effectively applied while reducing the weight of the vibrator, and the vibration efficiency can be improved. Further, according to the invention of claim 6, the opening width W4 of the groove of the vibrator is provided.
And the ratio (W4 / D) to the diameter D of the rotating shaft of the motor is 0.1.
Since the setting is made to be in the range of 83 to 0.98, it is possible to set the rotating shaft by pushing the rotating shaft into the groove when caulking the rotating shaft and the vibrator, thereby improving productivity. Can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a vibrator according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing a state before starting a caulking operation of the rotating shaft in the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a state before a crimping operation of the rotating shaft according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state in which the rotating shaft is being caulked in the first embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a state during a caulking operation of the rotating shaft according to the first embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view of a coupling portion between the rotating shaft and the vibrator according to the first embodiment of the present invention.

FIG. 8 is a transverse cross-sectional view for explaining a case where the rotating shaft is pushed into the groove of the vibrator from above.

FIGS. 9 (a), (b) and (c) show the first embodiment of the present invention.
FIG. 21 is a plan view for explaining a different modification of the vibrator in the embodiment.

FIGS. 10 (a), (b) and (c) are plan views for explaining different modified examples of the vibrator according to the first embodiment of the present invention.

FIGS. 11 (a), (b) and (c) are plan views for explaining another modified example of the vibrator according to the first embodiment of the present invention.

FIG. 12 is a plan view for explaining still another modified example of the vibrator according to the first embodiment of the present invention.

FIG. 13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a plan view for explaining still another modified example of the vibrator according to the first embodiment of the present invention.

FIG. 15 is a sectional view taken along the line XV-XV in FIG. 14;

FIG. 16 (a), (b), (c), and (d)
FIG. 9 is a cross-sectional view of a main part for describing a different modification of the vibrator according to the first embodiment of the present invention.

FIG. 17 is a perspective view of a combined body of a rotating shaft and a vibrator according to a second embodiment of the present invention.

FIG. 18 is a side view for explaining a caulking operation of a rotating shaft according to the second embodiment of the present invention.

FIG. 19 is a plan view showing a combined body of a rotating shaft and a vibrator according to a second embodiment of the present invention.

FIG. 20 is a side view for explaining a caulking operation of a rotating shaft as a modification of the second embodiment of the present invention.

FIG. 21 is a plan view showing a combined body of a rotating shaft and a vibrator as a modification of the second embodiment of the present invention.

FIG. 22 is a cross-sectional view showing a state where a rotating shaft is being caulked in a third embodiment of the present invention.

FIG. 23 is a longitudinal sectional view showing a state during a caulking operation of the rotating shaft according to the third embodiment of the present invention.

FIG. 24 is a cross-sectional view showing a state in which a rotating shaft is being caulked in a fourth embodiment of the present invention.

FIG. 25 is a longitudinal sectional view showing a state during a caulking operation of a rotating shaft in a fourth embodiment of the present invention.

FIG. 26 is a partially cutaway side view of a main part of a conventional vibration generator.

FIG. 27 is a view as viewed from the direction of the arrow F in FIG. 26;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small motor (motor) 2 Rotating shaft 3 Oscillator 3A Eccentric load part 3B Groove part 3C Side edge (near part) 3J, 3K, 3L Notch groove (notch) 4 Receiving jig 5 Caulking punch 5A, 5D, 5F Tip Part 5B, 5C, 5E Horizontal plane part (suppression part) W4 Opening width of groove part D Diameter of rotating shaft

Claims (6)

[Claims] 1. A vibration generator for a small wireless device, wherein a vibrator is integrally connected to a rotating shaft of a motor, wherein the vibrator is formed with a groove in which the rotating shaft fits, and at least in the groove. A vibration generator for a small wireless device, characterized in that the exposed portion of the rotating shaft fitted into the shaft is swaged to be integrally connected to the rotating shaft. 2. The vibrator according to claim 1, wherein the vibrator is integrally connected to the rotating shaft by caulking a portion near the groove in addition to the rotating shaft. Vibration generator for small wireless devices. 3. The small-sized device according to claim 1, wherein the groove portion of the vibrator is formed to have a size including a range of a central angle of 180 ° or more of the rotation shaft. Vibration generator for radio equipment. 4. A crimping punch is provided with a suppressor for suppressing a warp of the rotating shaft by contacting the rotating shaft when a tip end portion of the swaging punch crushes the rotating shaft. The vibration generator for a small wireless device according to claim 1 or 2. 5. The compact device according to claim 1, wherein the vibrator is formed in a column shape having a substantially fan-shaped cross section, and a cutout is formed in a linear side surface of the vibrator. Vibration generator for radio equipment. 6. An opening width W4 of the groove of the vibrator is:
4. The small wireless device according to claim 3, wherein a ratio (W4 / D) of the motor to the diameter D of the rotating shaft is set to be in a range of 0.83 to 0.98. 5. Vibration generator.