WO2006041045A1

WO2006041045A1 - Eccentric weight, vibration motor, portable apparatus, and method of producing eccentric weight

Info

Publication number: WO2006041045A1
Application number: PCT/JP2005/018666
Authority: WO
Inventors: Kenichi Shimodaira; Takaomi Tanaka; Yoshito Hirata; Hidehiko Ichikawa; Akira Shimojima; Hikaru Yoshizawa; Kenichi Kusano
Original assignee: Nanshin Co., Ltd.
Priority date: 2004-10-08
Filing date: 2005-10-07
Publication date: 2006-04-20
Also published as: WO2006040808A1

Abstract

An eccentric weight (920) has a weight (940) made from high specific weight metal, a weight holding section (934) for holding the weight (940) over its entire outer periphery, a motor shaft holding section (932) for holding a motor shaft, a connection section (936) for connecting the weight holding section (934) and the motor shaft holding section (932), and a weight support body (930) made from metal having lower specific gravity than the high specific gravity metal that forms the weight (940). The connection section (936) has a thin wall region (938) having a thickness (0.5 mm) less than the length (2 mm), measured along the motor shaft, of the motor shaft holding section (932). The total weight of the eccentric weight (920) can be reduced and the quantity of eccentricity in the eccentric weight (920) can be increased. Further, lowering of reliability of the joint between the weight (940) and the shaft body (930) can be suppressed even when the eccentric weight (920) is used for long periods of time.

Description

Eccentric weight, vibration motor, portable device, and manufacturing method of eccentric weight

The present invention relates to an eccentric weight, a vibration motor, a portable device, and a method for manufacturing an eccentric weight. Background art

In mobile phones and PDAs, vibration motors are used to notify incoming calls by vibration. FIG. 25 is a view for explaining a conventional vibration motor 3000 and an eccentric weight 3020. Fig. 25 (a) is a perspective view of vibration motor 3000, Fig. 25 (b) is a cross-sectional view of eccentric weight 3020 cut by a plane perpendicular to the motor axis, and Fig. 25 (c) is eccentric weight 302 0. It is sectional drawing cut | disconnected by the plane along a motor shaft. In FIGS. 25 (b) and 25 (c), the eccentric weight 3020 in FIG. 25 (a) is shown in a different position in the rotational direction.

As shown in FIG. 25, a conventional vibration motor 3000 includes a small cylindrical motor main body 3010 and an eccentric weight 3020 having a substantially fan shape and having a force such as a sintered body of tungsten. The motor shaft 3012 of the motor body 3010 is generally held in the motor shaft holding hole 3022 of the eccentric weight 3020. The eccentric weight 3020 is a caulking stop by deforming the motor shaft holding hole 3022 by applying an external force to the motor shaft holding hole 3022 through which the motor shaft 3012 passes. It is attached (for example, see Patent Document 1).

[0004] By the way, for a mobile phone, a PDA, and the like, there is a demand for a vibration motor that can obtain a necessary amount of vibration with low power consumption and light weight. For this reason, another eccentric weight 3120 as shown in FIG. 26 has been proposed as an eccentric weight used in such a vibration motor. FIG. 26 is a view for explaining another conventional eccentric weight 3120. Fig. 26 (a) is a front view of the eccentric weight 3120, Fig. 26 (b) is an A-A cross-sectional view of Fig. 26 (a), and Fig. 26 (c) is a front view of the component parts. 26 (d) is a cross-sectional view taken along the line BB in FIG. 26 (c). In FIG. 26 (a) and FIG. 26 (b), a part of the motor body 3110 is also shown.

As shown in FIG. 26, another conventional eccentric weight 3120 includes a motor shaft 3 of a motor main body 3110. It consists of a cylindrical weight support 3130 having a motor shaft holding hole 3132 for holding 112 and a low specific gravity metal force, and a substantially semi-pipe weight 3140 also having a high specific gravity metal force (for example, patents) Refer to Reference 1.) For this reason, since the weight 3140 also has a high specific gravity metal force, the center of gravity of the eccentric weight 3120 is disposed at a position separated from the center axis of the motor shaft holding hole 3132. As a result, the eccentric amount of the eccentric weight 3120 increases, and by using such other conventional eccentric weight 3120, a vibration motor that can obtain a required vibration amount with light weight and low power consumption can be configured.

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2001-129479

Disclosure of the invention

Problems to be solved by the invention

However, in the other conventional eccentric weight 3220, the weight 3240 is integrally joined and fixed to a part of the outer surface 3234 of the weight support 3230 via the brazing portion 3250. When the vibration motor (and the eccentric weight) is used for a long time, there is a problem that the reliability of the connection between the weight and the weight support is lowered.

Therefore, the present invention has been made to solve such a problem, and can be suitably used for a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption. An object of the present invention is to provide an eccentric weight and a method of manufacturing the same, in which the reliability of bonding between the weight and the weight support is suppressed even when the vibration motor is used for a long time. Moreover, an object of this invention is to provide the vibration motor and portable apparatus provided with the eccentric weight which was excellent in this way.

Means for solving the problem

[0009] (1) The eccentric weight of the present invention includes a weight having a high specific gravity metal force, a weight holding portion for holding the weight over a half circumference, a motor shaft holding portion for holding the motor shaft, and the weight described above. An eccentric weight having a holding portion and a connecting portion for connecting the motor shaft holding portion, and comprising a weight support made of a metal having a specific gravity lower than that of the high specific gravity metal constituting the weight, wherein the connecting portion is And a thin region having a thickness smaller than the length of the motor shaft holding portion along the motor shaft.

[0010] Therefore, according to the eccentric weight described in the above (1), the eccentric weight is made of a high specific gravity metal. Eccentric weights with a weight and a weight support that is made of a metal that has a lower specific gravity than the high-density metal that constitutes the weight are reduced to reduce the total weight of the eccentric weight and reduce the amount of eccentricity in the eccentric weight. Can be bigger. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

[0011] Further, according to the eccentric weight described in (1) above, since the weight is held by the weight holding portion in the weight support body over a half circumference, the vibration motor (and the eccentric weight) is used for a long time. In addition, it is possible to suppress a decrease in the reliability of bonding between the weight and the weight support. Therefore, by using such an eccentric weight, long-term reliability is high.

V, vibration motor can be configured.

[0012] Further, according to the eccentric weight described in (1) above, the weight holding portion and the motor at the connecting portion having a thin region having a thickness smaller than the length of the motor shaft holding portion along the motor shaft. Since the shaft holding portion is connected, the total weight of the eccentric weight can be reduced and the amount of eccentricity in the eccentric weight can be further increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption.

(2) In the eccentric weight described in (1) above, the thickness of the thin region may have a value of 50% or less of the length of the motor shaft holding portion along the motor shaft. preferable.

[0014] With this configuration, the total weight of the eccentric weight can be reduced, and the amount of eccentricity in the eccentric weight can be further increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with a lighter weight and less power consumption.

[0015] (3) In the eccentric weight described in (1) or (2) above, the weight support is formed from a plate-like member having a thickness substantially equal to the thickness of the thin region by a press drawing method. Preferably it is manufactured.

With this configuration, the thin member is simultaneously formed in the press drawing process, so that the weight support can be easily manufactured as compared with the case of using the cutting method. Further, material waste is reduced as compared with the case of using the cutting method. [0017] (4) The eccentric weight of the present invention includes a weight having a high specific gravity metal force, a weight holding portion for holding the weight over a half circumference, a motor shaft holding portion for holding the motor shaft, and the weight described above. A weight support body having a connection portion for connecting the holding portion and the motor shaft holding portion, and having a structure in which a plurality of thin plate members made of a metal having a specific gravity lower than that of the high specific gravity metal constituting the weight are laminated. Each of the coupling parts has a thin region having a thickness smaller than the length of the motor shaft holding part along the motor shaft.

[0018] Therefore, according to the eccentric weight described in (4) above, the eccentric weight includes a weight made of a high specific gravity metal, and a plurality of low weight metals having a specific gravity lower than that of the high specific gravity metal constituting the weight. Since the eccentric weight includes a weight support body having a structure in which thin plate members are laminated, the total weight of the eccentric weight can be reduced and the amount of eccentricity in the eccentric weight can be increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

[0019] Further, according to the eccentric weight described in (4) above, since the weight is held by the weight holding portion of the weight support body over a half circumference, the vibration motor (and the eccentric weight) is used for a long time. In addition, it is possible to suppress a decrease in the reliability of bonding between the weight and the weight support. Therefore, by using such an eccentric weight, a long-term reliable high-V vibration motor can be configured.

[0020] Further, according to the eccentric weight described in the above (4), since the predetermined thin wall region is provided in the connecting portion of each thin plate member, the total weight of the eccentric weight is further reduced, and the eccentric weight is reduced. The amount of eccentricity can be further increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with a lighter weight and less power consumption.

[0021] (5) In the eccentric weight described in (4) above, the sum of the thicknesses of the thin regions of the plurality of thin plate members is the length of the motor shaft holding portion along the motor shaft. It is preferred that the value is less than 50%.

With this configuration, the total weight of the eccentric weight can be reduced, and the amount of eccentricity in the eccentric weight can be further increased. For this reason, such an eccentric weight is used. Thus, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[0023] (6) In the eccentric weight described in (4) or (5), the thin plate member is formed by pressing a plate member having a thickness substantially equal to the thickness of the thin region by a press drawing method. Preferably it is manufactured.

[0024] With this configuration, the thin member is simultaneously formed in the press drawing process, so that the thin plate member can be easily manufactured as compared with the case of using the cutting method. Further, material waste is reduced as compared with the case of using the cutting method.

(7) In the eccentric weight according to any one of the above (1) to (6), the length of the motor shaft holding portion along the motor shaft is equal to the inner diameter of the motor shaft holding portion. It is preferable to have a value twice or more.

[0026] With this configuration, the motor shaft holding section is configured to hold the motor shaft with a sufficient holding force. For this reason, when a vibration motor is used for a long time, it can suppress that the reliability regarding the holding | maintenance of the motor shaft by a motor shaft holding part falls.

[0027] In the eccentric weight described in any one of the above (1) to (7), the larger the thin region, the lighter the total weight of the eccentric weight and the larger the amount of eccentricity in the eccentric weight. The benefit of being able to On the other hand, if the size of the thin region is made too large, the mechanical strength of the connecting portion is lowered, and there is a disadvantage that the reliability of the eccentric weight is impaired. Therefore, in the eccentric weight described in any one of (1) to (7) above, it is preferable to determine the size of the thin-wall region in the connecting portion by weighing these benefits and disadvantages.

(8) In the eccentric weight according to any of (1) to (7), the length of the thin region along the radial direction of the motor shaft is 0.4 mm or more. preferable.

[0029] With this configuration, the weight can be arranged as much as possible in the outer peripheral portion, so that the amount of eccentricity in the eccentric weight can be further increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with less power consumption.

[0030] (9) In the eccentric weight according to any one of (1) to (8) above, the eccentric weight is perpendicular to the motor shaft. The thickness of the weight holding portion on a flat surface is preferably 0.4 mm or less.

[0031] With this configuration, the weight can be increased as much as possible, and therefore the amount of eccentricity in the eccentric weight can be further increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with less power consumption.

Speaking of this viewpoint, the thickness of the weight holding part in the plane perpendicular to the motor shaft is

More preferably, it is 0.3 mm or less, and further preferably 0.2 mm or less.

[0032] (10) In the eccentric weight according to any one of (1) to (9), a thickness of the motor shaft holding portion on a surface perpendicular to the motor shaft is 0.4 mm or less. It is preferable.

With this configuration, the total weight of the eccentric weight can be further reduced, and the amount of eccentricity in the eccentric weight can be further increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption.

From this viewpoint, the thickness of the motor shaft holding portion in the plane perpendicular to the motor shaft is more preferably 0.3 mm or less, and further preferably 0.2 mm or less.

[0034] (11) In the eccentric weight according to any one of (1) to (10), the connecting portion is formed inside the thin area of the weight support or the thin area of the thin plate member. It is preferable to have struts or struts formed at the ends of the thin area of the weight support or the thin area of the thin plate member.

[0035] With this configuration, the mechanical strength of the weight support can be increased, so that a more reliable vibration motor can be configured. Further, since the mechanical strength of the weight support can be increased, the weight region of the weight support can be further reduced by increasing the thin region of the weight support. For this reason, the total weight of the eccentric weight can be further reduced, and the eccentric amount of the eccentric weight can be further increased. As a result, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with a lighter weight and less power consumption.

[0036] In the eccentric weight described in any of (1) to (11) above, the weight is the weight of the weight. It is preferable that the weight holding portion of the weight support is held by a portion having a length of at least half of the length along the longitudinal direction. With this configuration, the weight is held on the weight support by tension, and when the vibration motor (and the eccentric weight) is used for a long time, the weight holding force by the weight support is increased. It can suppress that it falls. For this reason, a vibration motor with high long-term reliability can be configured by using such an eccentric weight.

(12) The eccentric weight of the present invention has a weight that also has a high specific gravity metal force, a weight holding portion that holds the weight over a half circumference, and a motor shaft holding portion for holding the motor shaft, An eccentric weight provided with a weight support having a metal force lower in specific gravity than a high specific gravity metal constituting the weight, wherein the weight support is longer than a length of the motor shaft holding portion along the motor shaft. It has a thin region having a small thickness, and the thickness of the motor shaft holding portion along the motor shaft has a value more than twice the inner diameter of the motor shaft holding portion.

(13) The eccentric weight of the present invention has a weight that also has a high specific gravity metal force, a weight holding portion that holds the weight over a half circumference, and a motor shaft holding portion for holding the motor shaft, An eccentric weight having a weight support having a metal strength lower than that of a high specific gravity metal constituting the weight, the weight support having a through hole penetrating in a direction along the motor shaft. The thickness of the motor shaft holding portion along the motor shaft has a value more than twice the inner diameter of the motor shaft holding portion.

[0039] (14) The eccentric weight of the present invention includes a weight having a high specific gravity metal force, a weight holding portion for holding the weight over a half circumference, a motor shaft holding portion for holding a motor shaft, and the weight holding Connecting rod and the motor shaft holding portion, and has a single connecting rod when viewed from the direction along the motor shaft, and has a lower specific gravity than the high specific gravity metal constituting the weight. An eccentric weight including a weight support, wherein the thickness of the motor shaft holding portion along the motor shaft has a value more than twice the inner diameter of the motor shaft holding portion.

[0040] Therefore, according to the eccentric weight described in any one of (12) to (14) above, the eccentric weight has a specific gravity lower than that of the weight having a high specific gravity metal force and the high specific gravity metal constituting the weight. Metal power Therefore, the total weight of the eccentric weight can be reduced and the amount of eccentricity in the eccentric weight can be increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

[0041] Further, according to the eccentric weight described in any of (12) to (14) above, since the weight is held by the weight holding portion in the weight support for more than half a circumference, the vibration motor (and When the eccentric weight is used for a long time, it is possible to prevent the reliability of bonding between the weight and the weight support from being lowered. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor with high long-term reliability.

[0042] According to the eccentric weight described in any of (12) to (14) above, the thickness of the motor shaft holding portion along the motor shaft is more than twice the inner diameter of the motor shaft holding portion. Therefore, the motor shaft holder will hold the motor shaft with sufficient holding force. For this reason, when a vibration motor is used for a long time, it can suppress that the reliability regarding the holding | maintenance of the motor shaft by a motor shaft holding part falls.

[0043] According to the eccentric weight described in any of (12) to (14) above, as a weight support, a weight support having a predetermined thin region, a weight support having a predetermined through hole Or the weight holding part and the motor shaft holding part are equipped with any one of the weight supports that are connected by a predetermined connecting part, so the total weight of the eccentric weight is reduced and the amount of eccentricity in the eccentric weight Can be further increased. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption.

[0044] (15) In the eccentric weight according to any one of (12) to (14), it is preferable that the weight support is formed by a cutting method!

[0045] With this configuration, the eccentric weights described in the above (12) to (14) can be manufactured by a relatively simple method.

In this case, the cutting method is preferably performed using, for example, an end mill.

[0046] (16) In the eccentric weight according to any one of the above (12) to (14), the weight support is preferably manufactured by a metal powder injection molding method. With this configuration, the eccentric weight described in any one of (12) to (14) can be manufactured by a relatively simple method.

In this case, compared with the case where the weight support is manufactured using the cutting method, the thickness of the weight holding part and the motor shaft holding part can be reduced, so that the weight is reduced and the power consumption is reduced. Thus, a vibration motor capable of obtaining a necessary vibration amount can be configured. In addition, material waste is reduced as compared with the case of manufacturing by a cutting method. Furthermore, the degree of freedom in the shape of the weight support and weight in the eccentric weight can be increased.

[0048] In the eccentric weight described in any one of (1) to (16) above, "half or more" means half or more of the entire outer periphery of the weight in a plane perpendicular to the longitudinal direction of the weight. is there. The weight may be held in the weight holding portion over the entire length of the weight, but it is not necessarily required to be held in the weight holding portion over the entire length of the weight.

[0049] (17) In the eccentric weight according to any one of (1) to (16), it is preferable that the weight is held by the weight holding portion over the entire circumference.

[0050] With this configuration, the weight is held by the weight holding portion of the weight support over the entire circumference. For this reason, when the vibration motor is used for a long time, it is possible to further suppress the decrease in the reliability of the connection between the weight and the weight support.

[0051] (18) In the eccentric weight described in (1) to (17) above, it is preferable that the motor shaft holding portion has an opening portion that opens laterally.

[0052] With this configuration, it is possible to hold the motor shaft by applying force to the opening after inserting the motor shaft, and it is easy to attach the eccentric weight to the motor shaft. Become.

[0053] (19) In the eccentric weight according to any one of (1) to (18), the weight support is preferably made of stainless steel.

[0054] In general, a material constituting a weight (for example, tungsten, tungsten alloy, etc.) has a low corrosion resistance and tends to crack. Therefore, the eccentric weight as a whole has a high corrosion resistance and is difficult to crack (for example, nickel. ). However, in such a case, the joint between the eccentric weight and the plating film and the plating film itself can easily crack. As a result, it becomes easy to generate creases due to such cracks. For this reason, there has been a problem that the reliability related to holding the motor shaft in the motor shaft holding portion decreases. On the other hand, stainless steel is originally a material with high corrosion resistance and resistance to cracking, so it is not necessary to apply a plating. For this reason, cracks do not occur at the joint between the eccentric weight and the plating film, and the reliability related to holding the motor shaft in the motor shaft holding portion is reduced.

[0055] In addition, there is a problem that a material constituting the weight (for example, tungsten, tungsten alloy, etc.) is generally fragile and easily broken. On the other hand, since stainless steel is sticky, it is possible to solve the problem that the material constituting the weight is easily broken by holding such a brittle and easily broken weight with stainless steel for more than half a circumference. .

[0056] In addition, since materials (for example, tungsten and tungsten alloys) constituting weights are generally expensive, there is a problem that it is not easy to reduce the manufacturing cost of the eccentric weight. On the other hand, stainless steel is cheaper than tungsten and tungsten alloys, so it is easy to reduce the manufacturing cost of eccentric weight by configuring a weight support with such a relatively inexpensive stainless steel. Can solve the problem.

[0057] As the stainless steel, non-magnetic stainless steel can be preferably used in order to reduce the influence on the motor.

[0058] (20) In the eccentric weight described in (3) or (6) above, the weight support is made of a metal having quench hardening properties, a metal having age hardening properties, or a metal having work hardening properties. Or the shape memory alloy power is also preferred.

[0059] Thus, a weight support is formed by a press drawing method by forming a weight support with a quench-hardening metal, an age-hardening metal, a work-hardening metal, or a shape memory alloy. It is possible to sufficiently harden the weight support when manufacturing the iron, and it is possible to manufacture a highly reliable eccentric weight and vibration motor.

[0060] (21) In the eccentric weight according to any one of (1) to (20), the weight is selected from the group consisting of tungsten, tungsten alloy, osmium, osmium alloy, gold, gold alloy, iridium or iridium alloy. I prefer to be. [0061] With this configuration, tungsten, tungsten alloy, osmium, osmium alloy, gold, gold alloy, iridium or iridium alloy has a very high specific gravity, and therefore the amount of eccentricity in the eccentric weight can be further increased. . Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with less power consumption.

[0062] In the eccentric weight of the present invention, since the weight does not need a function for holding the motor shaft, the weight has a very simple shape (for example, a cross-section such as a circle, an ellipse, or a sector). Can be adopted. For this reason, as a weight, a sintered body sintered in the shape of a weight, or a sintered body with a deformed bar force having the same cross-sectional shape as a weight (for example, a circle, an ellipse, a fan shape, etc.) is cut short. Can be used. In addition, it is possible to use a cut body obtained by cutting a sintered body made of a round bar and cutting it into the same cross-sectional shape as that of the weight. In addition, when the cross-sectional shape of the weight is a circle, a sintered body that also has a round bar force can be used as it is cut short.

[0063] (22) In the eccentric weight according to any one of (1) to (21), the eccentric weight is used by being attached to the motor shaft at a portion where the motor body force protrudes. An eccentric weight characterized by being a weight.

By configuring in this way, it is possible to reduce the rotational diameter of the eccentric weight, and it is possible to configure a vibration motor that can obtain a necessary amount of vibration with less power consumption.

(23) In the eccentric weight according to any one of (1) to (22), the length of the weight support along the longitudinal direction of the weight is the length along the longitudinal direction of the weight. The weight holding part of the weight support shorter than the weight length holds the weight at a position eccentric along the longitudinal direction of the weight.

By configuring in this way, such an eccentric weight is fixed to the motor body so that the distance between the motor shaft holding part and the motor body approaches, thereby constituting a vibration motor. Since it is possible to reduce the distance between the motor weight holding portion of the eccentric weight and the bearing of the motor body, the deflection of the motor shaft can be suppressed when the motor shaft rotates. As a result, the eccentric weight rotates more stably, and the eccentric vibration characteristics of the vibration motor are further improved. (24) A vibration motor according to the present invention includes a motor main body and the eccentric weight according to any one of (1) to (23).

[0068] Therefore, according to the vibration motor described in the above (24), as described above, even when the vibration motor is used for a long time, the reliability of the connection between the weight and the weight support is lowered. Since the eccentric weight has a structure that can be suppressed and can easily increase the amount of eccentricity of the eccentric weight, the vibration motor is excellent in long-term reliability and eccentric vibration characteristics.

(25) A vibration motor of the present invention includes a motor main body and the eccentric weight described in (23) above, and the eccentric weight with respect to the motor main body includes the motor shaft holding portion and the motor. It is characterized by being fixed so that the distance from the main body is closer.

[0070] For this reason, according to the vibration motor described in (25) above, it is possible to suppress a decrease in the reliability of bonding between the weight and the weight support even when the vibration motor is used for a long time. Furthermore, since the eccentric weight has a structure that makes it easy to increase the amount of eccentricity of the eccentric weight, the vibration motor is excellent in long-term reliability and eccentric vibration characteristics.

[0071] Further, according to the vibration motor described in (25) above, since the distance between the motor shaft holding portion of the eccentric weight and the bearing of the motor main body is close, the motor shaft is rotated when the motor shaft rotates. Deflection can be suppressed. As a result, the eccentric weight rotates more stably, and the eccentric vibration characteristics of the vibration motor are further improved.

(26) A portable device of the present invention is characterized by including the vibration motor according to (24) or (25).

Therefore, according to the portable device of the present invention, since the vibration motor having high long-term reliability and eccentric vibration characteristics is provided, the portable device is excellent in long-term reliability and eccentric vibration characteristics.

(27) An eccentric weight manufacturing method of the present invention includes a weight made of a high specific gravity metal, a weight holding portion for holding the weight over a half circumference, a motor shaft holding portion for holding a motor shaft, and A weight supporting portion having a connecting portion for connecting the weight holding portion and the motor shaft holding portion, and having a metal force having a specific gravity lower than that of the high specific gravity metal constituting the weight. An eccentric weight manufacturing method for manufacturing an eccentric weight, which is smaller than the length of the motor shaft holding portion along the motor shaft! Producing a weight support;

And a step of inserting the weight into the weight support.

[0075] For this reason, according to the method of manufacturing the eccentric weight described in (27) above, it is possible to reduce the total weight of the eccentric weight and to manufacture an eccentric weight having a large amount of eccentricity. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

[0076] Further, according to the eccentric weight manufacturing method described in (27), since the weight support is manufactured by the plate member force press drawing method, a thin weight support is manufactured. This makes it possible to reduce the total weight of the eccentric weight and to further increase the amount of eccentricity in the eccentric weight.

[0077] Furthermore, according to the eccentric weight manufacturing method described in (27) above, since the weight support is manufactured from the plate member by the press drawing method, the cutting method is used. It becomes possible to manufacture a weight support easily compared with the above. In addition, material waste is reduced compared to the case of using a cutting method.

[0078] In the method of manufacturing the eccentric weight described in (27), in the process of manufacturing the weight support, a weight support is manufactured by laminating a plurality of thin plate members manufactured by the press drawing method. As you do.

(28) An eccentric weight manufacturing method of the present invention has a weight having a high specific gravity metal force, a weight holding portion for holding the weight, and a motor shaft holding portion for holding a motor shaft. A first step of preparing a weight support made of metal having a specific gravity lower than that of the high specific gravity metal constituting the weight, and in a direction along the motor shaft in a state where the weight is inserted into the weight support. Both-side forces include a second step of fixing the weight and the weight holding portion by pressing the weight and plastically deforming the weight.

[0080] Therefore, according to the method of manufacturing the eccentric weight described in (28) above, it is possible to reduce the total weight of the eccentric weight and to manufacture an eccentric weight having a large amount of eccentricity. wear. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

[0081] Further, according to the method of manufacturing the eccentric weight described in (28) above, the weight is firmly fixed to the weight holding portion because the weight and the weight holding portion are fixed by pressing the weight to cause plastic deformation. Will be held in. For this reason, when a vibration motor is used for a long time, it can further suppress that the reliability of joining of a weight and a weight support body falls.

[0082] In the method for producing an eccentric weight according to (28), the size of the weight in the first step is the same as the outer circumference of the weight when the weight is inserted into the weight support. It is preferable that the average value of the gap with the inner periphery of the weight holding portion is in a range of 5πι to 100 / ζ m.

With this configuration, the weight is firmly held by the weight holding portion, and the productivity when manufacturing the eccentric weight is improved. That is, by setting the average value of the gap between the outer periphery of the weight and the inner periphery of the weight holding portion to 100 m or less, the weight is firmly held by the weight holding portion due to plastic deformation of the weight due to pressing. Even if the weight is plated with nickel to prevent wrinkles, there is no need to increase the amount of plastic deformation and the nickel plating is cracked or peeled off, reducing the weight quality. Can be suppressed. Also, by setting the average value of the gap between the outer periphery of the weight and the inner periphery of the weight holding part to 5 m or less, it becomes easier to insert the weight into the weight support, and the productivity when producing an eccentric weight Can be improved.

Brief Description of Drawings

FIG. 1 is a view for explaining an eccentric weight 120 according to Embodiment 1.

FIG. 2 is a view for explaining the vibration motor 100 according to the first embodiment.

FIG. 3 is a view for explaining an eccentric weight 220 according to Embodiment 2.

FIG. 4 is a view for explaining an eccentric weight 320 according to Embodiment 3.

FIG. 5 is a view for explaining an eccentric weight 420 according to a fourth embodiment.

FIG. 6 is a view for explaining an eccentric weight 520 according to a fifth embodiment.

FIG. 7 is a view for explaining an eccentric weight 620 according to a sixth embodiment.

FIG. 8 is a view for explaining an eccentric weight 720 according to a seventh embodiment. FIG. 9 is a view for explaining an eccentric weight 820 according to an eighth embodiment.

FIG. 10 is a view for explaining an eccentric weight 920 according to the ninth embodiment.

FIG. 11 is a view for explaining a manufacturing method for manufacturing the eccentric weight 920 according to the ninth embodiment.

FIG. 12 is a view for explaining an eccentric weight 1020 according to the tenth embodiment.

FIG. 13 is a view for explaining an eccentric weight 1120 according to an eleventh embodiment.

FIG. 14 is a view for explaining an eccentric weight 1220 according to the twelfth embodiment.

FIG. 15 is a view for explaining an eccentric weight 1320 according to the thirteenth embodiment.

FIG. 16 is a view for explaining an eccentric weight 1420 according to the fourteenth embodiment.

FIG. 17 is a view for explaining an eccentric weight 1520 according to the fifteenth embodiment.

FIG. 18 is a view for explaining an eccentric weight 1620 according to the sixteenth embodiment.

FIG. 19 is a view for explaining an eccentric weight 1720 according to the seventeenth embodiment.

FIG. 20 is a view for explaining a vibration motor 1800 using the eccentric weight 1820 according to the eighteenth embodiment.

FIG. 21 is a schematic diagram for explaining the manufacturing method of the eccentric weight according to Embodiment 19. FIG. 22 is a schematic diagram for explaining the manufacturing method of the eccentric weight according to Embodiment 20. 23] A schematic diagram for explaining the manufacturing method of the eccentric weight according to the embodiment 21. [FIG. 24] A schematic diagram for explaining the manufacturing method of the eccentric weight according to the embodiment 22. [FIG. It is a figure shown in order to demonstrate the conventional vibration motor 3000 and the eccentric weight 3020

FIG. 26 is a view for explaining another conventional eccentric weight 3120.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the eccentric weight, vibration motor, portable device, and manufacturing method of the eccentric weight of the present invention will be described based on the embodiments shown in the drawings. [0086] Embodiments 1 and 2

Embodiments 1 and 2 are mainly embodiments for explaining an eccentric weight according to claim 14.

FIG. 1 is a view for explaining the eccentric weight 120 according to the first embodiment. Fig. 1 (a) is a view of the eccentric weight 120 from the frontal force, Fig. 1 (b) is a cross-sectional view taken along the line A-A in Fig. 1 (a), and Fig. 1 (c) is a diagram of Fig. 1 (a). FIG. 1 (d) is a perspective view of the eccentric weight 120, and FIG. 1 (e) is a perspective view of the eccentric weight 120 as seen from the back side of FIG. 1 (d).

As shown in FIG. 1, the eccentric weight 120 according to the first embodiment includes a weight 140 having a substantially fan-shaped cross section, and a weight support 130. Weight 140 also has high specific gravity metal power. The weight support body 130 also has a metal force having a specific gravity lower than that of the high specific gravity metal constituting the weight 140. The weight support 130 has a weight holding part 134 that holds the weight 140 over the entire circumference and a motor shaft holding part 132 for holding the motor shaft 112 (see FIG. 2). The weight support body 130 has a thin region 138 having a thickness smaller than the length of the motor shaft holding portion 132 along the motor shaft 112. The length of the motor shaft holder 132 along the motor shaft 112 has a value more than twice the inner diameter of the motor shaft holder 132.

Therefore, according to the eccentric weight 120 according to the first embodiment, the eccentric weight includes the weight 140 made of a high specific gravity metal, and the weight support having a lower specific gravity than the high specific gravity metal constituting the weight 140. Thus, the total weight of the eccentric weight 120 can be reduced and the amount of eccentricity of the eccentric weight 120 can be increased. Therefore, by using such an eccentric weight 120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

Further, according to the eccentric weight 120 according to the first embodiment, since the weight 140 is held by the weight holding portion 134 in the weight support 130 over the entire circumference, the vibration motor (and the eccentric weight 120) is provided. When used for a long time, it is possible to suppress a decrease in the reliability of bonding between the weight 140 and the weight support 130. Therefore, by using such an eccentric weight 120, it is possible to configure a vibration motor with high long-term reliability.

[0091] Further, according to the eccentric weight 120 according to the first embodiment, the predetermined weight region 138 is provided on the weight support 130, so that the total weight of the eccentric weight 120 is reduced and the eccentric weight 120 is provided. The amount of eccentricity at 120 can be further increased. For this reason, by using such an eccentric weight 120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption.

Further, according to the eccentric weight 120 according to the first embodiment, the thickness of the motor shaft holding portion 132 along the motor shaft 112 is set to a value more than twice the inner diameter of the motor shaft holding portion 132. The shaft holder 132 holds the motor shaft with a sufficient holding force. For this reason, when the vibration motor (and the eccentric weight 120) is used for a long period of time, it is possible to suppress a decrease in reliability related to the holding of the motor shaft by the motor shaft holding portion.

Note that the weight support 130 is formed with a hole having a shape corresponding to the cross-sectional shape of the weight 140 in order to hold the weight 140. In the eccentric weight 120 according to the first embodiment, the portion around this hole is referred to as a weight holding portion 134. In addition, a hole having a shape corresponding to the cross-sectional shape of the motor shaft 112 is formed in the weight support 130 to hold the motor shaft 112. In the eccentric weight 120 according to the first embodiment, a portion around this hole is referred to as a motor shaft holding portion 132.

In the first embodiment and each of the embodiments described later, “the entire circumference” refers to the entire outer circumference of the weight 140 in a plane perpendicular to the longitudinal direction of the weight 140.

In the eccentric weight 120 according to Embodiment 1, the length of the weight 140 along the direction parallel to the motor axis is 4 mm, as shown in FIGS. 1 (b) and 1 (c). . The length of the weight holder 134 along the direction parallel to the motor shaft is 2 mm, and the length of the motor shaft holder 132 along the direction parallel to the motor shaft is 2 mm.

Therefore, in the eccentric weight 120 according to the first embodiment, the weight 140 is held by the weight holding portion 134 at a portion (2 mm) that is half the length (4 mm) of the weight 140. As a result, the weight 140 is held on the weight support 130 by tension.

In the eccentric weight 120 according to the first embodiment, the thin region 138 has a thickness (0.2 mm) that is 10% of the length of the motor shaft holding portion 132 along the motor shaft. ing. That is, the thin region 138 has a shape in which a portion having a depth of 1.8 mm is deleted by cutting. For this reason, the weight of the weight support 130 can be sufficiently reduced, the total weight of the eccentric weight 120 is further reduced, and the amount of eccentricity in the eccentric weight 120 is further increased. You can make it bigger. For this reason, by using such an eccentric weight 120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and even less power consumption.

In the eccentric weight 120 according to the first embodiment, the thickness of the weight holding portion 134 in the outer peripheral portion that holds the weight 140 from the outer peripheral side of the eccentric weight 120 is 0.25 mm. Therefore, in the eccentric weight 120 according to the first embodiment, the weight 140 can be arranged on the outer peripheral portion as much as possible, and the weight 140 can be made as large as possible. Therefore, the amount of eccentricity in the eccentric weight 120 can be further increased. Can be bigger. Therefore, by using such an eccentric weight 120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with less power consumption.

In the eccentric weight 120 according to the first embodiment, the thickness of the motor shaft holding portion 132 in the direction along the radial direction of the motor shaft 112 is 0.2 mm. For this reason, in the eccentric weight 120 according to the first embodiment, the total weight of the eccentric weight 120 can be further reduced, and the amount of eccentricity in the eccentric weight 120 can be further increased. For this reason, by using such an eccentric weight 120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

In the eccentric weight 120 according to the first embodiment, as shown in FIG. 1, the weight 140 has a substantially fan-shaped cross section, and includes a predetermined first weight including the central axis of the motor shaft holding portion 132. It has a plane-symmetric shape with a plane (indicated by A–A in Fig. 1 (a)) as a plane of symmetry.

[0101] Therefore, in the eccentric weight 120 according to the first embodiment, the weight 140 is inserted into any end portion (see the end portions SI and S2 shown in Fig. 1 (b). The M-law force is also inserted into the weight holding portion 134. As a result, the degree of freedom when placing the weight 140 in the weight holding part 134 is improved and the workability is improved, so that the manufacturing cost for manufacturing the eccentric weight 120 can be reduced. It is out.

[0102] Here, "the central axis of the motor shaft holding part 132" means that the central axis of the motor shaft 112 is located when the motor shaft holding part 132 holds the motor shaft 112 (see Fig. 2). It is the axis that will be.

[0103] In the eccentric weight 120 according to the first embodiment, the weight 140 is a tungsten sintered alloy. Thus, the weight support 130 is made of a molten stainless steel having a specific gravity lower than that of the tungsten alloy.

[0104] For this reason, since the weight support 130 also has a stainless steel power of a molten material having a specific gravity lower than that of the tungsten sintered alloy constituting the weight 140, the weight support 130 is improved in durability and the weight support 130 is improved. And the weight 140 can be integrated more firmly, and the reliability of the connection between the weight 140 and the weight support 1 30 is reduced when the vibration motor (and the eccentric weight 120) is used for a long time. This can be suppressed. Therefore, by using such an eccentric weight 120, it is possible to configure a vibration motor with high long-term reliability.

[0105] Since stainless steel is originally a material with high corrosion resistance and resistance to rust, it is not necessary to apply a plating even if it is used as a weight support. As a result, cracks do not occur at the junction between the weight support 130 and the plating film and at the plating film itself. As a result, the occurrence of cracks due to cracks or the like is eliminated, and the reliability of holding the motor shaft 112 in the motor shaft holding part 132 can be improved.

[0106] In addition, since stainless steel is sticky, a brittle and fragile weight such as a tungsten alloy is held around the entire circumference with sticky stainless steel, which solves the V and U problem when the weight is easily broken. can do.

[0107] Since stainless steel is less expensive than tungsten alloy and the like, the weight support 130 is made of such a relatively inexpensive stainless steel, thereby reducing the manufacturing cost of the eccentric weight 120. Can do.

[0108] In the eccentric weight 120 according to the first embodiment, the thin region 138 is formed by a cutting method. For this reason, the eccentric weight 120 according to the first embodiment can be manufactured by a relatively simple method. The cutting method is performed using, for example, an end mill.

[0109] In the eccentric weight 120 according to the first embodiment, the weight 140 has a tungsten alloy strength. Since the tungsten alloy has a very high specific gravity, the amount of eccentricity in the eccentric weight 120 can be further increased. For this reason, by using such an eccentric weight 120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with further reduced power consumption.

[0110] In the eccentric weight 120 according to the first embodiment, the weight 140 itself includes the motor shaft 1. Since a function for holding 12 is not required, a very simple shape (bar shape having a substantially fan-shaped cross section) is adopted as the weight shape.

[0111] As a manufacturing method of the weight 140, a manufacturing method in which a tungsten alloy is sintered into a weight shape to obtain the weight 140 can be adopted. However, in the eccentric weight 120 according to the first embodiment, the tungsten alloy is made of The manufacturing method is to make a round bar with a simple shape by sintering and then cut out the round bar to make a weight of 140. By doing so, the amount of the additive (for example, copper) contained in the tandastain alloy can be reduced, so that the specific gravity can be increased and the amount of eccentricity in the eccentric weight 120 can be further increased. become able to.

[0112] The eccentric weight 120 according to Embodiment 1 can be manufactured, for example, by the following method.

[0113] (1) A member having a shape corresponding to the weight support 130 is manufactured by a press working method (however, the thin region 138 and the motor shaft holding portion 132 are not formed).

(2) The weight support body 130 is manufactured by forming the thin region 138 and the motor shaft holding portion 132 on this member by a cutting method.

(3) A tungsten alloy round bar having a cross section larger than that of the weight 140 is prepared.

(4) Next, the outer circumference of the round bar described above is cut to produce a bar having a cross-sectional shape corresponding to the cross-sectional shape of the weight 140.

(5) Next, the above-described bar is cut into a predetermined length to produce a weight 140.

[6] (6) The weight support 140 is held by the weight support 134 by caulking the weight support 130 from the outside with the weight 140 inserted in the weight holding part 134 of the weight support 130.

(7) Thereby, the eccentric weight 120 in which the weight 140 is held by the weight holding portion 134 in the weight support 130 over the entire circumference is manufactured.

[0116] By adopting such a method, the weight 140 is held firmly by the weight holding part 134 in the weight support 130 over the entire circumference, so that the vibration motor (and the eccentric weight 120) is lengthened. It is possible to suppress a decrease in the reliability of bonding between the weight 140 and the weight support 130 when used for a long time. FIG. 2 is a view for explaining the vibration motor 100 according to the first embodiment. Fig. 2 (a) is a perspective view of the vibration motor 100, Fig. 2 (b) is a view of the vibration motor 100 as viewed from the front, and Fig. 2 (c) is a view of the main part of the vibration motor 100 as viewed from the side. It is a figure.

The vibration motor 100 according to the first embodiment is a vibration motor including a motor body 110 and an eccentric weight 120. Further, as described above, the vibration motor 100 according to the first embodiment is an eccentric weight that can be suitably used for a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption. It is equipped with an excellent eccentric weight 120 that suppresses a decrease in the reliability of the connection between the weight and the weight support when the motor is used for a long time. For this reason, the vibration motor 100 according to the first embodiment is a vibration motor having such an excellent eccentric weight 120. Therefore, a required amount of vibration can be obtained with light weight and low power consumption, and long-term reliability can be obtained. High vibration motor.

[0119] For this reason, by using the vibration motor 100 that is light and has low power consumption and has the required amount of vibration and has high reliability for a long time as a vibration motor for portable devices, It can be a highly portable device that is lightweight, has low power consumption, and is reliable for a long time.

FIG. 3 is a view for explaining the eccentric weight 220 according to the second embodiment. Fig. 3 (a) is a view of the eccentric weight 220 also showing the front force, and Fig. 3 (b) is a cross-sectional view taken along line AA in Fig. 3 (a). The eccentric weight 220 according to the second embodiment has basically the same structure as the eccentric weight 120 according to the first embodiment. However, the eccentric weight 220 according to the second embodiment is different from the eccentric weight 120 according to the first embodiment in the structure of the weight support 230 as shown in FIG. In other words, in the eccentric weight 220 according to the second embodiment, the weight support body 230 has the thin regions 238 that open on both sides in the direction along the motor shaft.

[0121] As described above, the eccentric weight 220 according to the second embodiment is different from the eccentric weight 120 according to the first embodiment in the structure of the weight support 230, but the eccentric weight 120 according to the first embodiment is different from the case of the eccentric weight 120 according to the first embodiment. In the same way, the eccentric weight is an eccentric weight 220 having a weight 240 made of a high specific gravity metal and a weight support body 230 having a metal force with a specific gravity lower than that of the high specific gravity metal constituting the weight 240. The total weight of 220 can be reduced and the amount of eccentricity in the eccentric weight 220 can be increased. For this reason, by using such an eccentric weight 220, the weight is reduced. A vibration motor capable of obtaining a necessary vibration amount with low power consumption can be configured.

[0122] Further, according to the eccentric weight 220 according to the second embodiment, the weight 240 is held by the weight holding portion 234 in the weight support 230 over the entire circumference, so that the vibration motor (and the eccentric weight 220) is provided. When used for a long time, it is possible to suppress a decrease in the reliability of bonding between the weight 240 and the weight support 230. Therefore, by using such an eccentric weight 220, it is possible to configure a vibration motor with high long-term reliability.

[0123] Further, according to the eccentric weight 220 according to the second embodiment, the predetermined weight region 238 is provided on the weight support 230, so that the total weight of the eccentric weight is reduced and the eccentric weight in the eccentric weight is also provided. The amount can be further increased. For this reason, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption.

[0124] Further, according to the eccentric weight 220 according to the second embodiment, the thickness of the motor shaft holding portion 232 along the motor shaft is set to a value more than twice the inner diameter of the motor shaft holding portion 232. The part 232 holds the motor shaft with a sufficient holding force. For this reason, when the vibration motor (and the eccentric weight 220) is used for a long time, it is possible to suppress a decrease in reliability related to holding the motor shaft by the motor shaft holding portion.

[Embodiment 3]

The third embodiment is an embodiment mainly for explaining an eccentric weight according to claim 15.

FIG. 4 is a view for explaining the eccentric weight 320 according to the third embodiment. Fig. 4 (a) is a view of the eccentric weight 320 as viewed from the front, and Fig. 4 (b) is a cross-sectional view taken along line AA in Fig. 4 (a).

[0126] The eccentric weight 320 according to the third embodiment basically has the same structure as the eccentric weight 120 according to the first embodiment. However, the eccentric weight 320 according to the third embodiment is different from the eccentric weight 120 according to the first embodiment in the structure of the weight support 330 as shown in FIG. In other words, in the eccentric weight 320 according to the third embodiment, the weight support 330 has a through hole 338 that penetrates in the direction along the motor shaft.

As described above, the eccentric weight 320 according to the third embodiment has the structure of the weight support 330 as an embodiment. Unlike the case of the eccentric weight 120 according to the state 1, the eccentric weight is composed of a weight 340 having a high specific gravity metal force and a weight support body 330 made of a low density metal having a specific gravity lower than that of the high specific gravity metal constituting the weight 340. Since the eccentric weight 320 is provided, as in the case of the eccentric weight 120 according to the first embodiment, the total weight of the eccentric weight 320 can be reduced and the amount of eccentricity in the eccentric weight 320 can be increased. For this reason, by using such an eccentric weight 320, it is possible to configure a vibration motor that can obtain a large vibration amount with light weight and low power consumption.

Further, according to the eccentric weight 320 according to the third embodiment, the weight 340 is held by the weight holding portion 334 in the weight support body 330 over the entire circumference, so that the eccentric weight 120 according to the first embodiment has the Similarly to the case, when the eccentric weight 320 is used for a long time, it is possible to suppress a decrease in the reliability of bonding between the weight 340 and the weight support 330. Therefore, by using such an eccentric weight 320, a vibration motor with high long-term reliability can be configured.

[0129] Further, according to the eccentric weight 320 according to the third embodiment, since the predetermined support hole 338 is provided in the weight support 330, the eccentric weight 320 is the same as the case of the eccentric weight 120 according to the first embodiment. As a result, the eccentric weight of the eccentric weight 320 can be further increased. Therefore, by using such an eccentric weight 320, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption.

[0130] Furthermore, according to the eccentric weight 320 according to the third embodiment, the thickness of the motor shaft holding portion 332 along the motor shaft is set to a value more than twice the inner diameter of the motor shaft holding portion 332. The holding part 332 holds the motor shaft with a sufficient holding force. For this reason, when the vibration motor (and the eccentric weight 320) is used for a long period of time, it is possible to suppress a decrease in reliability related to the motor shaft holding by the motor shaft holding portion.

[Embodiment 4]

Embodiment 4 is an embodiment mainly for explaining an eccentric weight according to claim 16.

FIG. 5 is a view for explaining the eccentric weight 420 according to the fourth embodiment. FIG. 5 (a) is a view of the eccentric weight 420 as viewed from the front, and FIG. 5 (b) is a cross-sectional view taken along line AA in FIG. 5 (a). [0132] The eccentric weight 420 according to the fourth embodiment has basically the same structure as the eccentric weight 120 according to the first embodiment. However, the eccentric weight 420 according to the fourth embodiment is different from the eccentric weight 120 according to the first embodiment in the structure of the weight support 430, as shown in FIG. That is, in the eccentric weight 420 according to the fourth embodiment, the weight support 430 has a predetermined connecting rod 436 that connects the weight holding portion 434 and the motor shaft holding portion 432.

[0133] As described above, the eccentric weight 420 according to the fourth embodiment is different from the eccentric weight 120 according to the first embodiment in the structure of the weight support body 430, but the eccentric weight is divided into components having high specific gravity metal force. Since the eccentric weight 420 is provided with the copper 440 and the weight support body 430 made of a low weight metal having a specific gravity lower than that of the high specific gravity metal constituting the weight 440, the eccentric weight is the same as in the case of the eccentric weight 120 according to the first embodiment. While reducing the total weight of the weight 420, the amount of eccentricity in the eccentric weight 420 can be increased. For this reason, by using such an eccentric weight 420, it is possible to configure a vibration motor that can obtain a large vibration amount with light weight and low power consumption.

In addition, according to the eccentric weight 420 according to the fourth embodiment, the weight 440 is held by the weight holding portion 434 in the weight support body 430 over the entire circumference, so that the eccentric weight according to the first embodiment is used. As in the case of 120, when the eccentric weight 420 is used for a long time, it is possible to suppress a decrease in the reliability of bonding between the weight 440 and the weight support 430. Therefore, by using such an eccentric weight 420, it is possible to configure a vibration motor with high long-term reliability.

Further, according to the eccentric weight 420 according to the fourth embodiment, the weight holding portion 434 and the motor shaft holding portion 432 are connected by a predetermined connecting portion, so that the eccentric weight 120 according to the first embodiment is used. Similarly to the above, the total weight of the eccentric weight 420 can be reduced and the amount of eccentricity in the eccentric weight 420 can be further increased. For this reason, by using such an eccentric weight 420, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and even less power consumption.

[0136] Furthermore, according to the eccentric weight 420 according to the fourth embodiment, the thickness of the motor shaft holding portion 432 along the motor shaft is set to a value more than twice the inner diameter of the motor shaft holding portion 432. The holding portion 432 holds the motor shaft with a sufficient holding force. For this reason, when the vibration motor (and the eccentric weight 420) is used for a long time, the motor shaft holding part will It can suppress that the reliability regarding the holding | maintenance of a data axis falls.

[Embodiments 5 to 7]

Embodiments 5 to 7 are embodiments mainly for explaining an eccentric weight according to claim 14.

FIG. 6 is a view for explaining the eccentric weight 520 according to the fifth embodiment. FIG. 6 (a) is a view of the eccentric weight 520 viewed from the front, and FIG. 6 (b) is a cross-sectional view taken along the line AA in FIG. 6 (a). FIG. 7 is a view for explaining the eccentric weight 620 according to the sixth embodiment. Fig. 7 (a) is a view of the eccentric weight 620 as viewed from the front, and Fig. 7 (b) is a cross-sectional view taken along line A-A in Fig. 7 (a). FIG. 8 is a view for explaining the eccentric weight 720 according to the seventh embodiment.

Fig. 8 (a) is a view of the eccentric weight 720 as seen from the front, and Fig. 8 (b) is a cross-sectional view taken along the line AA in Fig. 8 (a).

[0139] The eccentric weight 520 according to the fifth embodiment basically has the same structure as the eccentric weight 120 according to the first embodiment. However, as shown in FIG. 6, the eccentric weight 520 according to the fifth embodiment has the shape of the weight 540 (and the shape of the weight holding portion 534 in the weight support 530) as shown in FIG. It is different from the case of. That is, in the eccentric weight 520 according to the fifth embodiment, the weight 540 has an oval shape.

[0140] The eccentric weight 620 according to the sixth embodiment has basically the same structure as the eccentric weight 120 according to the first embodiment. However, the eccentric weight 620 according to the sixth embodiment is different from the eccentric weight 120 according to the first embodiment in the shape of the weight support 630 as shown in FIG. That is, in the eccentric weight 620 according to the sixth embodiment, the weight support 630 serves as a weight holding portion instead of the weight holding portion that holds the weight over the entire circumference, over a half circumference with respect to the entire outer circumference of the weight 640. A weight holding portion 634 that holds the weight 640 is provided.

[0141] The eccentric weight 720 according to the seventh embodiment has basically the same structure as the eccentric weight 120 according to the first embodiment. However, the eccentric weight 720 according to the seventh embodiment is different from the eccentric weight 120 according to the first embodiment in the structure of the weight support 730 as shown in FIG. In other words, in the eccentric weight 720 according to the seventh embodiment, the weight support 730 has an opening 7 39 instead of the motor shaft holding portion that holds the motor shaft over the entire circumference as the motor shaft holding portion. A motor shaft holding portion 732 is provided. In this case, the motor shaft is held by the motor shaft After being inserted into the portion 732, the opening is held and held by the weight support 730.

As described above, the eccentric weights 520, 620, and 720 according to the embodiments 5 to 7 are the shape of the weight 540 (and the shape of the weight holding portion 534 in the weight support 530), the weight support 6 30. The shape of the weight support or the structure of the weight support 730 is different from the case of the eccentric weight 120 according to the first embodiment.The eccentric weight is a weight 540, 640, 740 having a high specific gravity metal force, and the weight 540, 640, Since the eccentric weights 520, 620, and 720 have weight support bodies 530, 630, and 730 made of a metal having a specific gravity lower than that of the high specific gravity metal that constitutes 740, the eccentric weight 120 according to the first embodiment and Similarly, the total weight of the eccentric weights 520, 620, 720 can be reduced and the amount of eccentricity in the eccentric weights 520, 620, 720 can be increased. For this reason, by using such eccentric weights 520, 620, and 720, it is possible to configure a vibration motor that is lightweight and can obtain a large amount of vibration with low power consumption.

[0143] In addition, Embodiments 5 to 7 [Such deviations, weights 520, 620, 720 [Kyore ryama, weights 540, 640, 740 are weight holding rods in weight support bodies 530, 630, 730 over the entire circumference] 634, 734, so that when the vibration motor (and the eccentric weights 520, 620, 720) is used for a long time, as in the case of the eccentric weight 120 according to the first embodiment, the weights 540, 64 0, 740 It is possible to suppress a decrease in the reliability of joining between the weight support 530, 630, and 730. Therefore, by using such eccentric weights 520, 620, 720, it is possible to configure a vibration motor with high long-term reliability.

[0144] Further, according to the eccentric weights 520, 620, 720 according to the fifth to seventh embodiments, the predetermined thin regions 538, 638, 738 are provided on the weight support bodies 530, 630, 730. As in the case of the eccentric weight 120 according to the above, the total weight of the eccentric weights 520, 620, 720 can be reduced, and the amount of eccentricity in the eccentric weights 520, 620, 720 can be further increased. For this reason, a vibration motor that can obtain the required vibration amount with a lighter weight and even less power consumption can be configured by using such a deviation, weight 520, 620, 720! .

Furthermore, according to the eccentric weights 520, 620, 720 according to Embodiments 5 to 7, the thicknesses of the motor shaft holding portions 532, 632, 732 along the motor shaft are set to the motor shaft holding portions 532, 632, Since the value is more than twice the inner diameter of 732, the motor shaft holders 532, 632, 732 hold the motor shaft with sufficient holding force. For this reason, vibration motors (and eccentric weights 520, 620, 720) when used for a long period of time, it is possible to suppress a decrease in the reliability of the motor shaft holding portion regarding the holding of the motor shaft.

Note that, in the eccentric weight 620 according to the sixth embodiment, the width L2 of the opening in the weight holding part 634 is set to be narrower than the maximum length L1 parallel to the width direction of the opening in the weight 640. For this reason, the weight 640 is held by the weight holding part 634 for a while.

[Embodiment 8]

Embodiment 8 is an embodiment mainly for explaining an eccentric weight according to claim 18.

FIG. 9 is a view for explaining the eccentric weight 820 according to the eighth embodiment. Fig. 9 (a) is a diagram of the eccentric weight 820 viewed from the front, Fig. 9 (b) is a schematic diagram of the eccentric weight 820 viewed from the front, and Fig. 9 (c) is a diagram of Fig. 9 (a). Fig. 9 (d) is a cross-sectional view along B-B in Fig. 9 (a), Fig. 9 (e) is a perspective view of eccentric weight 820, and Fig. 9 (f) is eccentric. FIG. 10 is a perspective view of the weight 820 as seen from the back side of FIG. 9 (e).

[0148] The eccentric weight 820 according to the eighth embodiment has basically the same structure as the eccentric weight 420 according to the fourth embodiment. However, the eccentric weight 820 according to the eighth embodiment is different from the eccentric weight 420 according to the fourth embodiment in the method of manufacturing the weight support 830. That is, in the eccentric weight 820 according to Embodiment 8, the weight support 830 is manufactured by the metal powder injection molding method. In FIG. 9 (b), the shaded portion is the connecting portion 836.

[0149] As described above, the eccentric weight 820 according to the eighth embodiment is different from the eccentric weight 420 according to the fourth embodiment in the manufacturing method of the weight support 830, but the eccentric weight is made of a high specific gravity metal. In the same way as the eccentric weight 420 according to the fourth embodiment, the eccentric weight 820 is provided with the weight 840 and the weight support 830 made of a metal having a specific gravity lower than that of the high specific gravity metal constituting the weight 840. The total weight of the eccentric weight 820 can be reduced and the amount of eccentricity in the eccentric weight 820 can be increased. For this reason, by using such an eccentric weight 820, it is possible to configure a vibration motor that can obtain a large amount of vibration with light weight and low power consumption.

[0150] Also, according to the eccentric weight 820 according to the eighth embodiment, the weight 840 is supported over the entire circumference. Since the weight holding part 834 in the holding body 830 is held, the weight 840 and the weight when the vibration motor (and the eccentric weight 820) are used for a long time as in the case of the eccentric weight 420 according to the fourth embodiment. It is possible to suppress a decrease in the reliability of bonding with the support 830. Therefore, by using such an eccentric weight 820, a vibration motor with high long-term reliability can be configured.

[0151] Further, according to the eccentric weight 820 according to the eighth embodiment, the thickness of the motor shaft holding portion 832 along the motor shaft is set to a value more than twice the inner diameter of the motor shaft holding portion 832. The part 832 holds the motor shaft with a sufficient holding force. For this reason, when the vibration motor (and the eccentric weight 820) is used for a long period of time, it is possible to suppress a decrease in reliability related to holding the motor shaft by the motor shaft holding portion.

[0152] Further, according to the eccentric weight 820 according to the eighth embodiment, the weight holding portion 834 and the motor shaft holding portion 832 are connected by the predetermined connecting portion 836, so the eccentric weight according to the fourth embodiment 4 20 As in the case of, the total weight of the eccentric weight 820 can be reduced and the amount of eccentricity in the eccentric weight 820 can be further increased. For this reason, by using such an eccentric weight 820, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and even less power consumption.

[0153] Also, according to the eccentric weight 820 according to the eighth embodiment, since the weight support 830 is manufactured by the metal powder injection molding method, the cutting method as in the case of the eccentric weight 420 according to the fourth embodiment. Compared to the case of manufacturing by using a vibration motor, the weight holding part 834 and motor shaft holding part 8 32 can be made thinner, and a vibration motor that can achieve the required amount of vibration with lighter and less power consumption. can do. Therefore, in the eccentric weight 820 according to the eighth embodiment, as shown in FIG. 9 (c), the thickness at the weight holding portion 834 and the motor shaft holding portion 832 is set to 0.15 mm.

Further, according to the eccentric weight 820 according to the eighth embodiment, material waste is reduced as compared with the case of manufacturing by a cutting method.

Furthermore, according to the eccentric weight 820 according to the eighth embodiment, the degree of freedom of the shape of the weight support 830 and the weight 840 in the eccentric weight 820 can be increased.

[Embodiments 9 to 12] Embodiments 9 to 12 are embodiments mainly for explaining a method of manufacturing an eccentric weight according to claim 1 and an eccentric weight according to claim 27.

FIG. 10 is a view for explaining the eccentric weight 920 according to the ninth embodiment. Fig. 10 (a) is a diagram of the eccentric weight 920 viewed from the front, Fig. 10 (b) is a schematic diagram of the eccentric weight 920 viewed from the front, and Fig. 10 (c) is A in Fig. 10 (a). — Cross-sectional view of A, FIG. 10 (d) is a cross-sectional view of B—B of FIG. 10 (a), FIG. 10 (e) is a perspective view of an eccentric weight 920, and FIG. 10 (f) is an eccentric weight. FIG. 11 is a perspective view of 920 as seen from the back side of FIG. 10 (e).

FIG. 11 is a view for explaining a manufacturing method for manufacturing the eccentric weight 920 according to the ninth embodiment. FIG. 11 (a) to FIG. 11 (f) are diagrams showing the main parts in the manufacturing process.

[0156] The eccentric weight 920 according to the ninth embodiment basically has the same structure as the eccentric weights 420 and 820 according to the fourth or eighth embodiment. However, as shown in FIGS. 10 and 11, the eccentric weight 920 according to the ninth embodiment is different from the eccentric weights 420 and 820 according to the fourth or eighth embodiment in the structure and manufacturing method of the connecting portion 936. That is, in the eccentric weight 920 according to the tenth embodiment, the connecting portion 936 (see the shaded portion in FIG. 10 (b)) has a value smaller than the length of the motor shaft holding portion 932 along the motor shaft. It has a thin area with a thickness. The weight support 930 is manufactured by a plate member force press drawing method (see FIG. 11). A column 939 is formed at the end of the thin region 938.

As described above, the eccentric weight 920 according to the ninth embodiment is different from the eccentric weights 420 and 820 according to the fourth or eighth embodiment in the structure of the connecting portion 936 and the manufacturing method of the weight support 930. Since the weight is an eccentric weight 940 having a weight 940 made of a high specific gravity metal and a weight support 930 having a lower specific gravity than that of the high specific gravity metal constituting the weight 940, the eccentric weight 920 according to the first embodiment is used. As with the weight 120, the total weight of the eccentric weight 920 can be reduced and the amount of eccentricity in the eccentric weight 920 can be increased. Therefore, by using such an eccentric weight 920, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

[0158] Also, according to the eccentric weight 920 according to the ninth embodiment, the weight 940 is held by the weight holding portion 934 in the weight support 930 over the entire circumference. As in the case of the eccentric weights 420 and 820, it is possible to suppress a decrease in the reliability of bonding between the weight 940 and the weight support 930 when the vibration motor (and the eccentric weight 920) is used for a long time. . Therefore, by using such an eccentric weight 920, it is possible to configure a vibration motor with high long-term reliability.

[0159] Also, according to the eccentric weight 920 according to the ninth embodiment, the thickness of the motor shaft holding portion 932 along the motor shaft is set to a value more than twice the inner diameter of the motor shaft holding portion 932. The part 932 holds the motor shaft with a sufficient holding force. For this reason, when the vibration motor (and the eccentric weight 920) is used for a long period of time, it is possible to suppress a decrease in reliability related to holding the motor shaft by the motor shaft holding portion.

[0160] Further, according to the eccentric weight 920 according to the ninth embodiment, since the weight holding portion 934 and the motor shaft holding portion 932 are connected by the predetermined connecting portion 936, the eccentric weight according to the fourth or eighth embodiment. As in the case of 420 and 820, the total weight of the eccentric weight 920 can be reduced and the amount of eccentricity in the eccentric weight 920 can be further increased. Therefore, by using such an eccentric weight 920, it is possible to configure a vibration motor that can obtain a necessary vibration amount with a lighter weight and less power consumption.

[0161] Also, according to the eccentric weight 920 according to the ninth embodiment, the connecting portion 936 having a thin region having a thickness smaller than the length of the motor shaft holding portion 932 along the motor shaft is used as the connecting portion. Therefore, the total weight of the eccentric weight 920 can be further reduced and the amount of eccentricity in the eccentric weight 920 can be further increased as compared with the case of the eccentric weights 420 and 820 according to the fourth or eighth embodiment. For this reason, by using such an eccentric weight 920, it is possible to construct a vibration motor that can obtain a required vibration amount with lighter and less power consumption.

[0162] In the eccentric weight 920 according to the ninth embodiment, the weight support 930 is manufactured from a plate-like member having a thickness substantially equal to the thickness of the thin-walled region by the press drawing method.

[0163] Therefore, according to the eccentric weight 920 according to the ninth embodiment, since the thin-walled material is simultaneously formed in the press drawing process, the weight support is easily manufactured as compared with the case of using the cutting method. It becomes possible to do. In addition, there is less waste of material compared to using the cutting method. [0164] In the eccentric weight 920 according to the ninth embodiment, as shown in Fig. 10 (c), the thickness of the thin region is a value of 50% or less of the length of the motor shaft holding portion 932 along the motor shaft. have

Therefore, according to the eccentric weight 920 according to the ninth embodiment, the total weight of the eccentric weight 920 can be further reduced, and the amount of eccentricity in the eccentric weight 920 can be further increased. Therefore, by using such an eccentric weight 920, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

In the eccentric weight 920 according to Embodiment 9, as shown in FIG. 10 (c), the length of the thin region 936 along the radial direction of the motor shaft 1712 is 0.4 mm.

[0167] Therefore, in the eccentric weight 920 according to the ninth embodiment, the weight 940 can be arranged on the outer peripheral portion as much as possible. For this reason, the amount of eccentricity in the eccentric weight 920 can be further increased. Therefore, by using such an eccentric weight 920, it is possible to configure a vibration motor that can obtain a necessary vibration amount with much less power consumption.

In the eccentric weight 920 according to the ninth embodiment, as shown in FIG. 10 (c), the thickness of the weight holding portion 934 in the outer peripheral portion that holds the weight 940 from the outer peripheral side of the eccentric weight 920 is: 0.15mm.

[0169] Therefore, in the eccentric weight 920 according to the ninth embodiment, the weight 940 can be arranged on the outer peripheral portion as much as possible, and the weight 940 can be made as large as possible. Therefore, the amount of eccentricity in the eccentric weight 920 can be further increased. be able to. Therefore, by using such an eccentric weight 920, it is possible to configure a vibration motor that can obtain a necessary vibration amount with less power consumption.

In the eccentric weight 920 according to the ninth embodiment, as shown in FIG. 10 (c), the thickness of the motor shaft holding portion 932 is 0.15 mm.

Therefore, in the eccentric weight 920 according to the ninth embodiment, the total weight of the eccentric weight 920 can be further reduced, and the amount of eccentricity in the eccentric weight 920 can be further increased. Therefore, by using such an eccentric weight 920, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[0172] In the eccentric weight 920 according to Embodiment 9, the weight 940 is a tungsten sintered alloy. The weight support 930 is made of martensitic stainless steel as a metal having quenching hardenability.

[0173] Therefore, according to the eccentric weight 920 according to the ninth embodiment, the weight support 930 can be cured when the weight support is manufactured by the press drawing method, and the eccentricity is highly reliable. Weights and vibration motors can be manufactured.

[0174] In the eccentric weight 920 according to the ninth embodiment, the weight support 930 has the structure shown in Figs. 11 (a) to 11.

As shown in (f), it is manufactured by a press drawing method.

[0175] (1) Work placement

First, as a work W that is a martensitic stainless steel with a thickness of 0.5 mm at a predetermined position between the die plate 962 in the die for press drawing and the punch plate 972 in the punch die. A plate-shaped member is arranged (see FIG. 11 (a);).

[0176] (2) Press drawing

Next, the punching die (and punch 974) is lowered toward the workpiece W, and pressure is applied to the part corresponding to the hole of the motor shaft holding part 932 and the part corresponding to the hole of the weight holding part 934. I will go. At this time, the portion constituting the motor shaft holding portion 932 and the portion constituting the weight holding portion 934 cause plastic deformation and extend downward in the drawing (FIG. 11 (b) to FIG. 11). See Figure 11 (d);). This press drawing can be performed by performing a single press, or by performing multiple presses while exchanging the die mold 960 and the punch mold 970.

[0177] (3) Removal of unnecessary parts

Next, remove the workpiece W from the press stop device 950, is removed by cutting the unnecessary parts min in weight support (see FIG. 11 (e) and FIG. 11 (f).) ₀ in this case, unnecessary portions Cut along the broken lines LI, L2, and L3 in Fig. 11 (e), and cut multiple times along the horizontal and vertical directions of the drawing. Thereby, the weight support body 930 is manufactured. In addition, you may cut an unnecessary part along the up-down direction of drawing using a press force grinder.

[0178] By inserting the weight 940 into the weight support 930 thus manufactured, the eccentric weight 920 according to Embodiment 9 can be manufactured.

[0179] FIG. 12 is a view for explaining the eccentric weight 1020 according to the tenth embodiment. Figure 1 2 (a) is a view of the eccentric weight 1020 as viewed from the front, and FIG. 12 (b) is a cross-sectional view taken along the line AA in FIG. 12 (a).

[0180] An eccentric weight 1020 according to the tenth embodiment has basically the same structure as the eccentric weight 920 according to the ninth embodiment. However, the eccentric weight 1020 according to the tenth embodiment is different from the eccentric weight 920 according to the ninth embodiment in the structure of the weight support 1030 as shown in FIG. That is, in the eccentric weight 1020 according to the tenth embodiment, as shown in FIG. 12 (b), the rib 1039 is formed inside the thin region 1038 of the weight support 1030.

[0181] For this reason, in the eccentric weight 1020 according to the tenth embodiment, the mechanical strength of the weight support 1030 can be increased, so that a more reliable vibration motor can be configured. In addition, since the mechanical strength of the weight support 1030 can be increased, the weight region 1038 of the weight support 1030 can be enlarged to further reduce the weight of the weight support 1030. For this reason, the total weight of the eccentric weight 1020 can be further reduced, and the amount of eccentricity of the eccentric weight 1020 can be further increased. As a result, by using such an eccentric weight 1020, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and even less power consumption.

[0182] The eccentric weight 1020 according to the tenth embodiment has the same configuration as the eccentric weight 920 according to the ninth embodiment except for the above, and therefore the eccentric weight 920 according to the ninth embodiment is provided. It has the effect to do as it is.

FIG. 13 is a view for explaining the eccentric weight 1120 according to the eleventh embodiment. Figure 1

3 (a) is a view of the eccentric weight 1120 as viewed from the front, and FIG. 13 (b) is a cross-sectional view taken along the line AA in FIG. 13 (a).

[0184] The eccentric weight 1120 according to the eleventh embodiment basically has the same structure as the eccentric weight 920 according to the ninth embodiment. However, the eccentric weight 1120 according to the eleventh embodiment is different from the eccentric weight 920 according to the ninth embodiment in the structure of the weight support 1130 as shown in FIG. That is, in the eccentric weight 1120 according to the eleventh embodiment, a hole 1139 that penetrates in the direction along the motor shaft is formed in the thin region 1138 of the weight support 1130.

[0185] Therefore, in the eccentric weight 1120 according to the eleventh embodiment, the weight of the weight support 1130 can be further reduced. For this reason, the total weight of the eccentric weight 1120 is further increased. The eccentric amount of the eccentric weight 1120 can be further increased. Therefore, by using such an eccentric weight 1120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[0186] The eccentric weight 1120 according to Embodiment 11 has the same configuration as that of the eccentric weight 920 according to Embodiment 9 in other points, and therefore the eccentric weight 920 according to Embodiment 9 is provided. It has the effect to do as it is.

[Embodiments 12 to 15]

Embodiments 12 to 15 are embodiments mainly for explaining an eccentric weight according to claim 4.

FIG. 14 is a view for explaining the eccentric weight 1220 according to the twelfth embodiment. Figure 1

4 (a) is a view of the eccentric weight 1220 as viewed from the front, and FIG. 14 (b) is a cross-sectional view taken along the line AA in FIG. 14 (a).

FIG. 15 is a view for explaining the eccentric weight 1320 according to the thirteenth embodiment. Figure 1

5 (a) is a view of the eccentric weight 1320 as seen from the front, and FIG. 15 (b) is a cross-sectional view taken along the line AA in FIG. 15 (a).

FIG. 16 is a view for explaining the eccentric weight 1420 according to the fourteenth embodiment. Figure 1

6 (a) is a view of the eccentric weight 1420 as seen from the front, and FIG. 16 (b) is a cross-sectional view taken along the line AA in FIG. 16 (a).

FIG. 17 is a view for explaining the eccentric weight 1520 according to the fifteenth embodiment. Fig. 17 (a) is a view of the eccentric weight 1520 as seen from the front, and Fig. 17 (b) is a cross-sectional view taken along the line AA in Fig. 17 (a).

[0188] Deviations according to Embodiments 12 to 15, weights 1220, 1320, 1420, 1520ί, and weights having a structure in which a plurality of thin plate members are laminated as weight support members as shown in FIGS. 14 to 17 This is different from the case of the eccentric weights 920, 1020, 1120 according to Embodiment 9 to L1: in that a support body is used.

[0189] As described above, the embodiment according to the embodiments 12 to 15 uses the weight support body having a structure in which a plurality of thin plate members are laminated, including the weights 1220, 1320, 1420, and 1520ί. 9 to 11 Eccentric weights according to 1 920, 1020, 1120 Because it has an eccentric weight comprising a weight made of heavy metal and a weight support that has a structure in which a plurality of thin plate members made of metal are laminated, which has a lower specific gravity than the high specific gravity metal that composes the weight

As in the case of the eccentric weights 920, 1020, and 1120 according to the ninth to eleventh embodiments, the total weight of the eccentric weight can be reduced and the amount of eccentricity in the eccentric weight can be increased. For this reason, a vibration motor capable of obtaining a necessary vibration amount with light weight and low power consumption can be configured by using such a deviation and weights 1220, 1320, 1420, and 1520.

[0190] Further, Embodiments 12 to 15 [this deviation, weights 1220, 1320, 1420, 1520 [koyore ryoko, because the weight is held by each weight holding portion in the weight support over a half circumference, Embodiments 9 to 9: As with the eccentric weights 920, 1020, and 1120 related to L1, the reliability of the connection between the weight and the weight support decreases when the vibration motor (and the eccentric weight) is used for a long time. Can be suppressed. Therefore, by using such eccentric weights 1220, 1320, 1420, 1520, a vibration motor with high long-term reliability can be configured.

[0191] In addition, Embodiments 12 to 15 [this eccentricity, weight 1220, 1320, 1420, 1520 [koyore ryoko, because a predetermined thin area is provided in the connecting portion of each thin plate member, the total weight of the eccentric weights] Can be further reduced, and the amount of eccentricity in the eccentric weight can be further increased. For this reason, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[0192] In addition, Embodiments 12 to 15 [Such deviations, weights 1220, 1320, 1420, 1520 [Correspondingly, the sum of the thicknesses of the thin regions in the plurality of thin plate members is the sum of The value is 50% or less of the length of the motor shaft holding portion along the shaft.

[0193] For this reason, Embodiments 12 to 15 [this eccentricity, weights 1220, 1320, 1420, 1520 [koyore], the total weight of the eccentric weight can be reduced, and the amount of eccentricity in the eccentric weight can be further increased. it can. For this reason, by using such an eccentric weight, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption.

[0194] Also, Embodiments 12 to 15 [Such deviations, weights 1220, 1320, 1420, 1520 [Correction, thin plate member is a plate member force press having a thickness substantially equal to the thickness of the thin region] Because it is manufactured by the drawing method, thin-walled members are formed at the same time in the press drawing process. Therefore, the thin plate member can be easily manufactured as compared with the case of using the cutting method. In addition, material waste is reduced compared to the case of using a cutting method.

[0195] In addition, the lengths of the motor shaft holding portion along the motor shaft are the inner diameters of the motor shaft holding portions. Embodiments 12 to 15 [Such deviations, weights 1220, 1320, 1420, 1520 It is more than twice the value.

For this reason, Embodiments 12 to 15 [Such deviations, weights 1220, 1320, 1420, 1520 [Correction], the motor shaft holding part holds the motor shaft with a sufficient holding force. For this reason, when a vibration motor is used for a long time, it can suppress that the reliability regarding the holding | maintenance of the motor shaft by a motor shaft holding part falls.

[Embodiments 16 to 17]

Embodiments 16 to 17 are mainly embodiments for explaining an eccentric weight according to claim 1.

FIG. 18 is a view for explaining the eccentric weight 1620 according to the sixteenth embodiment. Fig. 18 (a) is a view of the eccentric weight 1620 as seen from the front, and Fig. 18 (b) is a cross-sectional view taken along the line A-A in Fig. 18 (a).

[0198] The eccentric weight 1620 according to the sixteenth embodiment has basically the same structure as the eccentric weight 920 according to the ninth embodiment. However, the eccentric weight 1620 according to the sixteenth embodiment is different from the eccentric weight 920 according to the ninth embodiment in the structure of the weight support 1630 as shown in FIG. That is, in the eccentric weight 1620 according to the sixteenth embodiment, the thin wall region 1638 extends to both ends in the circumferential direction of the connecting portion 1636 of the weight support 1630. In other words, no struts are formed at the end of the thin region 1638.

[0199] For this reason, according to the eccentric weight 1620 according to the sixteenth embodiment, the weight of the connecting portion 1636 can be further reduced. As a result, the total weight of the eccentric weight 1620 can be further reduced, and the eccentric amount of the eccentric weight 1620 can be further increased. As a result, by using such an eccentric weight 1620, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[0200] The eccentric weight 1620 according to Embodiment 16 has the same configuration as that of the eccentric weight 920 according to Embodiment 9 in other respects, and therefore the eccentric weight 920 according to Embodiment 9 is provided. It has the effect to do as it is.

[0201] FIG. 19 is a view for explaining an eccentric weight 1720 according to the seventeenth embodiment. Fig. 19 (a) is a view of the eccentric weight 1720 as viewed from the front, and Fig. 19 (b) is a cross-sectional view taken along line AA in Fig. 19 (a).

[0202] The eccentric weight 1720 according to the seventeenth embodiment has basically the same structure as the eccentric weight 1620 according to the sixteenth embodiment. However, the eccentric weight 1720 according to the seventeenth embodiment is different from the eccentric weight 1620 according to the sixteenth embodiment in the structure of the weight support 1730 as shown in FIG. That is, in the eccentric weight 1720 according to the seventeenth embodiment, the connecting portion 1736 that connects the weight holding portion 1734 and the motor shaft holding portion 1732 is a single connecting rod when viewed from the direction along the motor shaft 1712. It has a shape like this.

[0203] For this reason, according to the eccentric weight 1720 according to the seventeenth embodiment, the connecting portion 1736 has a shape that forms a single connecting rod when viewed from the direction along the motor shaft 1 712. Therefore, the eccentric weight 172 0 As a result, the eccentric weight of the eccentric weight 1720 can be further increased. For this reason, by using such an eccentric weight 1720, a vibration motor that is lighter and has a smaller amount of vibration required for power consumption than that of the eccentric weight 1620 according to Embodiment 16 can be configured. be able to.

[0204] The eccentric weight 1720 according to the seventeenth embodiment has the same configuration as the eccentric weight 1620 according to the sixteenth embodiment in other points, and therefore, the eccentric weight 162 according to the sixteenth embodiment 162. It has the effect that 0 has.

[Embodiment 18]

Embodiment 18 is an embodiment for mainly explaining the eccentric weight according to claim 23 and the vibration motor according to claim 25.

FIG. 20 is a view for explaining a vibration motor 1800 including the eccentric weight 1820 according to the eighteenth embodiment. FIG. 20 (a) is a diagram showing a vibration motor 900 including the eccentric weight 920 according to the ninth embodiment, and FIG. 20 (b) is a diagram illustrating a vibration motor 1800 including the eccentric weight 1820 according to the eighteenth embodiment. It is.

As shown in FIG. 20 (b), the eccentric weight 1820 according to the eighteenth embodiment includes a weight 1840 in which the weight support 1830 along the longitudinal direction of the weight 940 extends along the longitudinal direction of the weight 1840. of The weight support 1834 of the weight support 1830 shorter than the length holds the weight 1840 in an eccentric position along the length of the weight 1840.

Therefore, according to the eccentric weight 1820 according to the eighteenth embodiment, as shown in FIG. 20 (b), the eccentric weight 1820 is connected to the motor body 1810 with respect to the motor shaft holding portion 1832 and the motor body 18. By configuring the vibration motor so that the distance to 10 is closer, the distance between the motor shaft holder 1832 of the eccentric weight 1820 and the bearing 1814 of the motor body 1810 can be reduced. When the shaft 1812 rotates, the deflection of the motor shaft 1812 can be suppressed. As a result, the eccentric weight 1820 rotates more stably, and the eccentric vibration characteristics of the vibration motor 1800 are further improved.

[Embodiments 19 to 22]

Embodiments 19 to 22 are embodiments for mainly explaining an eccentric weight manufacturing method according to claim 28.

FIG. 21 is a schematic diagram for explaining the method for manufacturing the eccentric weight according to the nineteenth embodiment. Fig. 21 (a), Fig. 21 (b), Fig. 21 (d) and Fig. 21 (f) are front views of the eccentric weight 1 920 in each manufacturing process, and Fig. 21 (c), Fig. 21 (e) and Fig. 21 FIG. 21 (g) is an AA cross-sectional view of the eccentric weight 1920 in each manufacturing process.

[0210] The method for manufacturing the eccentric weight according to Embodiment 19 will be described below in the order of steps.

[0211] (1) First step

First, a high-density metal power comprised weight 1940, prepared a weight support 1930 formed of a metal lower specific gravity than the high specific gravity metal (FIG. 21 (a) see.) ₀

[0212] (2) Second step

First, a weight 1940 is inserted into the weight support 1930 (see FIG. 21 (a);). Next, with the weight 1940 inserted into the weight support 1930, the weight 1940 is pressed from both sides in the direction along the motor shaft (see FIGS. 21 (d) and 21 (e);). At this time, the weight 1940 is plastically deformed so that its dimension increases in a direction perpendicular to the pressing direction. Thereby, the weight 1940 and the weight holding portion 1934 are fixed (see FIG. 21 (f) and FIG. 21 (g);). Before and after the second process, comparing the dimensions of the weight 1940 in the plane perpendicular to the motor shaft, the dimension of the weight 1940 before the second process is L3 (see Fig. 21 (c)), and the weight after the second process is 1940 dimensions Is L4 (see Fig. 21 (g)), L3 and L4 have a relationship of L3 and L4.

[0213] Through these steps, the eccentric weight 1920 can be manufactured.

[0214] The weight 1940 prepared in the first step is the gap between the outer periphery of the weight 1940 and the inner periphery of the weight holding portion 1934 when the weight 1940 is inserted into the weight holding portion 1934 of the weight support 1930. Is set to a size that falls within the range of 5 m ~: LOO / zm (see Fig. 21 (b) and Fig. 21 (c)).

[0215] Therefore, according to the manufacturing method of the eccentric weight according to the nineteenth embodiment, the weight 1940 and the weight holding portion 1934 are fixed by pressing the weight 1940 and plastically deforming. 1934 is firmly held. For this reason, when the vibration motor is used for a long time, it is possible to further suppress a decrease in the reliability of joining of the weight 1940 and the weight support 1934.

[0216] Also, according to the eccentric weight manufacturing method according to Embodiment 19, when the weight 1940 is inserted into the weight holding portion 1934 of the weight support 1930, the outer periphery of the weight 1940 and the weight holding portion 1934 By setting the average value of the gap to the circumference within the range of 5 μm to 100 μm, the weight 1940 is firmly held by the weight holding portion 1934, and the eccentric weight 1920 is manufactured. Productivity.

That is, by setting the average value of the gap between the outer circumference of the weight 1940 and the inner circumference of the weight holding portion 1934 to 100 μm or less, the weight 1240 is firmly attached to the weight holding portion 1934 due to plastic deformation of the weight 1940 due to pressing. Will be held in. Even if the weight 1940 is nickel-plated to prevent wrinkles, there is no need to increase the amount of plastic deformation. Can be prevented from decreasing. Also, by setting the average value of the gap between the outer circumference of the weight 1940 and the inner circumference of the weight holding part 1934 to 5 m or less, it becomes easy to insert the weight 1940 into the weight support 1930, and the eccentric weight 1920 is manufactured. It is possible to improve the productivity when doing so.

FIG. 22 is a schematic diagram for explaining the method for manufacturing the eccentric weight according to the twentieth embodiment. FIG. 22 (a) is a perspective view of the eccentric weight 2020, and FIG. 22 (b) is a cross-sectional view of the eccentric weight 2020 in the second step. [0219] The manufacturing method of the eccentric weight according to the twentieth embodiment includes basically the same steps as the manufacturing method of the eccentric weight according to the nineteenth embodiment. However, as shown in FIG. 22 (a), the manufacturing method of the eccentric weight according to the embodiment 20 differs from the manufacturing method of the eccentric weight according to the embodiment 19 in the structure of the weight support prepared in the first step. . That is, in the eccentric weight manufacturing method according to the twentieth embodiment, the weight support 2030 having no thin region is prepared in the first step.

[0220] Thus, the eccentric weight manufacturing method according to Embodiment 20 is different from the eccentric weight manufacturing method according to Embodiment 19 in the structure of the weight support prepared in the first step, but the weight support In the state where the weight 2040 is inserted into the body 2030, the second step of fixing the weight 2040 and the weight holding portion 2034 by pressing the weight 2040 and plastically deforming the weight 2040 also in the direction along the motor shaft is performed. Therefore, the weight 2040 is firmly held by the weight holding portion 2034. For this reason, when the vibration motor is used for a long time, it is possible to further suppress a decrease in the reliability of bonding between the weight 2040 and the weight support 2030.

[0221] The eccentric weight manufacturing method according to Embodiment 20 includes the same steps as the eccentric weight manufacturing method according to Embodiment 19 in the other respects. It has the effect which the manufacturing method of copper has as it is.

FIG. 23 is a schematic view for explaining the method for manufacturing the eccentric weight according to the twenty-first embodiment. FIG. 23 (a) is a perspective view of the eccentric weight 2120, and FIG. 23 (b) is a cross-sectional view of the eccentric weight 2120 in the second step.

[0223] The manufacturing method of the eccentric weight according to Embodiment 21 includes basically the same steps as the manufacturing method of the eccentric weight according to Embodiment 19. However, the eccentric weight manufacturing method according to Embodiment 21 is different from the eccentric weight manufacturing method according to Embodiment 19 in the structure of the weight support prepared in the first step, as shown in FIG. 23 (a). . That is, in the eccentric weight manufacturing method according to Embodiment 21, as shown in FIG. 23, in the first step, a weight support 2130 having a structure in which a plurality of thin plate members 2 131 are stacked is prepared. Yes.

Thus, the eccentric weight manufacturing method according to Embodiment 21 differs from the eccentric weight manufacturing method according to Embodiment 19 in the structure of the weight support prepared in the first step. The second step of fixing the weight 2140 and the weight holding part 2134 by pressing the weight 2140 and plastically deforming the weight 2140 by pressing the weight 2140 with the weight 2140 inserted into the support 2130. Therefore, the weight 2140 is firmly held by the weight holding portion 2134. For this reason, when the vibration motor is used for a long time, it is possible to further suppress a decrease in the reliability of joining between the weight 2140 and the weight support 2130.

[0225] Since the manufacturing method of the eccentric weight according to Embodiment 21 includes the same steps as the manufacturing method of the eccentric weight according to Embodiment 19 in other points, the eccentric weight according to Embodiment 19 is included. It has the effect which the manufacturing method of copper has as it is.

FIG. 24 is a schematic diagram for explaining the method for manufacturing the eccentric weight according to the twenty-second embodiment. FIG. 24A is a perspective view of the eccentric weight 2220, and FIG. 24B is a cross-sectional view of the eccentric weight 2220 in the second step.

[0227] The manufacturing method of the eccentric weight according to the twenty-second embodiment includes basically the same steps as the manufacturing method of the eccentric weight according to the nineteenth embodiment. However, the eccentric weight manufacturing method according to Embodiment 22 is different from the eccentric weight manufacturing method according to Embodiment 19 in the structure of the weight support prepared in the first step, as shown in FIG. . That is, as shown in FIG. 24, in the eccentric weight manufacturing method according to Embodiment 22, in the first step, a plurality of thin plate members 2231 are stacked, and the weight holding portion 2234 extends from the motor shaft holding portion 2232. A weight support 2230 having an arm portion for holding the weight 2240 by elastic force and having a structure in which the motor shaft holding portion 2232 has a notch is prepared.

[0228] Thus, the eccentric weight manufacturing method according to Embodiment 22 is different from the eccentric weight manufacturing method according to Embodiment 19 in the structure of the weight support prepared in the first step. With the weight 2240 inserted into the body 2230, the second step of fixing the weight 2240 and the weight holding part 2234 by pressing the weight 2240 and also plastically deforming the weight 2240 by pressing the weight 2240 in the direction along the motor shaft. Accordingly, the weight 2240 is firmly held by the weight holding portion 2234. For this reason, when the vibration motor is used for a long time, it is possible to further suppress a decrease in the reliability of joining between the weight 2240 and the weight support 2230. [0229] Since the eccentric weight manufacturing method according to Embodiment 22 includes the same steps as the eccentric weight manufacturing method according to Embodiment 19 in other respects, the eccentric weight according to Embodiment 19 is included. It has the effect which the manufacturing method of copper has as it is.

[0230] While the eccentric weight, vibration motor, portable device, and manufacturing method of the eccentric weight of the present invention have been described based on the above embodiments, the present invention is not limited to the above embodiments. Without departing from the spirit of the present invention, the present invention can be carried out in various modes within the scope, and the following modifications are possible, for example.

(1) In the eccentric weights 120 to 2220 of the above embodiments, the force using tungsten alloy as the weight is not limited to this. For example, a metal having a specific gravity higher than that of tungsten, osmium, osmium alloy, gold, gold alloy, iridium, iridium alloy, and other weight supports can be used.

[0232] (2) In the eccentric weights 120 to 2220 of each of the above embodiments, as a weight support, a member manufactured by a forging method, a member manufactured by a metal powder injection molding method, a press drawing The force using what was manufactured by the forming method The present invention is not limited to this. For example, a product manufactured by a forging method, a product manufactured by a burring method, or a product manufactured by a forging method can be used.

[0233] (3) In the eccentric weight 920 according to Embodiment 9, the weight support 930 is a force using martensitic stainless steel as a metal having quench hardening properties. The present invention is limited to this. is not. For example, a quench-hardening metal other than martensitic stainless steel, an age-hardening metal, a work-hardening metal, a shape memory alloy, and other metals can be used.

[0234] (4) In the eccentric weights 120 to 2220 of each of the above embodiments, a sintered body made of a round bar is cut as a weight, and the cut body processed into the same cross-sectional shape as the weight is cut short. However, the present invention is not limited to this. For example, as a weight, a sintered body sintered in the shape of a weight, or a sintered body with a deformed bar force that has the same cross-sectional shape as a weight (for example, a circle, an ellipse, a fan shape, etc.) is cut short. Can be used. In addition, when the cross-sectional shape of the weight is a circle, for example, a sintered body having a round bar force can be used as it is cut short. [0235] (5) The manufacturing method of the eccentric weight according to the first embodiment includes the step of crimping the weight support 130 in a state where the weight 140 is inserted into the weight holding hole 134 of the weight support 130. Although it is a manufacturing method, this invention is not limited to this. For example, the manufacturing method may include a step of press-fitting the weight 140 into the weight holding hole 134 in the weight support body 130 with a tight margin, and the temperature of the weight support body 130 is higher than the temperature of the weight 140 Thus, the manufacturing method may include a step of inserting the weight 140 into the weight holding hole 134 in the weight support 130. Moreover, the manufacturing method including the process of joining the weight 140 and the weight support body 130 by brazing, adhesion | attachment, or welding may be sufficient. Further, the manufacturing method may include a step of inserting the material of the weight support 130 into the mold in a state where a part or all of the weight 140 is placed in a predetermined mold. Moreover, the manufacturing method which used the above-mentioned process together may be sufficient. For example, a manufacturing method including a step of bonding after crimping, a manufacturing method including a step of bonding after brazing, a manufacturing method including a step of spot welding after crimping, and brazing after spot welding A manufacturing method including a process is also possible.

(6) When the eccentric weight of the present invention is fixed to the motor main body, the motor shaft in the motor main body is joined to the motor shaft holding portion of the eccentric weight of the present invention. For this, a joining method similar to the joining method of the weight and the weight support as shown in (5) above can be adopted.

[0237] (7) The joining position in the longitudinal direction of the weight holding portion with respect to the weight in the eccentric weight of the present invention and the joining position in the longitudinal direction of the eccentric weight and the motor shaft in the vibration motor of the present invention are as described in the above embodiment 18. It is not limited to the positional relationship shown in FIG. Therefore, the positional relationship shown in the embodiment 18 can be commonly applied to all the embodiments described above.

(8) The vibration motor of the present invention can also be suitably used for a remote control of a power game machine, a pachinko operation unit, an electric toothbrush and the like suitably used for portable devices such as mobile phones and PDAs.

Claims

The scope of the claims

[1] High specific gravity metal weight,

A weight holding portion for holding the weight over a half circumference; a motor shaft holding portion for holding the motor shaft; and a connecting portion for connecting the weight holding portion and the motor shaft holding portion to constitute the weight. An eccentric weight equipped with a weight support body having a lower specific gravity and higher metal strength than a high specific gravity metal,

The eccentric weight is characterized in that the connecting portion has a thin region having a thickness smaller than the length of the motor shaft holding portion along the motor shaft.

[2] In the eccentric weight according to claim 1,

An eccentric weight, wherein the thickness of the thin region has a value of 50% or less of the length of the motor shaft holding portion along the motor shaft.

[3] In the eccentric weight according to claim 1 or 2,

The eccentric weight is characterized in that the weight support is manufactured by a press drawing method from a plate-like member having a thickness substantially equal to the thickness of the thin region.

[4] High specific gravity metal strength

A weight holding portion for holding the weight over a half circumference; a motor shaft holding portion for holding the motor shaft; and a connecting portion for connecting the weight holding portion and the motor shaft holding portion to constitute the weight. An eccentric weight comprising a weight support body having a structure in which a plurality of thin plate members made of metal are laminated, each having a specific gravity lower than that of a high specific gravity metal, wherein each of the connecting portions is arranged along the motor shaft. An eccentric weight characterized by having a thin wall region having a thickness smaller than the length of the motor shaft holding portion.

[5] The eccentric weight according to claim 4,

An eccentric weight characterized in that the total thickness of each thin region in the plurality of thin plate members is a value of 50% or less of the length of the motor shaft holding portion along the motor shaft.

[6] In the eccentric weight according to claim 4 or 5,

The eccentric weight is characterized in that the thin plate member is also manufactured by a press drawing method in which a plate-shaped member cap having a thickness substantially equal to the thickness of the thin region is also provided.

[7] In the eccentric weight according to any one of claims 1 to 6,

The length of the motor shaft holding portion along the motor shaft has a value more than twice the inner diameter of the motor shaft holding portion.

[8] In the eccentric weight according to any one of claims 1 to 7,

An eccentric weight, wherein a length of the thin region along a radial direction of the motor shaft is 0.4 mm or more.

[9] In the eccentric weight according to any one of claims 1 to 8,

An eccentric weight, wherein a thickness of the weight holding portion on a surface perpendicular to the motor shaft is 0.4 mm or less.

[10] In the eccentric weight according to any one of claims 1 to 9,

An eccentric weight, wherein a thickness of the motor shaft holding portion in a plane perpendicular to the motor shaft is 0.4 mm or less.

[11] In the eccentric weight according to any one of claims 1 to 12,

The connecting portion is a rib formed inside the thin area of the weight support or the thin area of the thin plate member, or a support column formed at the end of the thin area of the weight support or the thin area of the thin plate member. The eccentric weight characterized by having.

[12] In the eccentric weight according to claim 3 or 6,

The eccentric weight is characterized in that the weight support is made of a quench-hardening metal, an age-hardening metal, a work-hardening metal, or a shape memory alloy.

[13] High specific gravity metal weight,

A weight holding portion for holding the weight over a half circumference and a motor shaft holding portion for holding the motor shaft, and a weight support body having a lower specific gravity than a high specific gravity metal constituting the weight. An eccentric weight,

The weight support has a thin region having a thickness smaller than the length of the motor shaft holding portion along the motor shaft,

The eccentric weight, wherein the thickness of the motor shaft holding portion along the motor shaft has a value more than twice the inner diameter of the motor shaft holding portion.

[14] Weight with high specific gravity metal power, A weight holding portion for holding the weight over a half circumference and a motor shaft holding portion for holding the motor shaft, and a weight support body having a lower specific gravity than a high specific gravity metal constituting the weight. An eccentric weight,

The weight support body has a through-hole penetrating in a direction along the motor shaft, and the thickness of the motor shaft holding portion along the motor shaft is at least twice the inner diameter of the motor shaft holding portion. An eccentric weight characterized by having a value.

[15] A high specific gravity metal weight,

A weight holding part for holding the weight over a half circumference, a motor shaft holding part for holding the motor shaft, and a connecting rod for connecting the weight holding part and the motor shaft holding part, along the motor shaft An eccentric weight having a connecting rod as viewed from the direction and comprising a weight support made of a metal having a specific gravity lower than that of the high specific gravity metal constituting the weight,

[16] In the eccentric weight according to any one of claims 13 to 15,

An eccentric weight, wherein the weight support is formed by a cutting method.

[17] In the eccentric weight according to any one of claims 13 to 15,

The eccentric weight is characterized in that the weight support is manufactured by a metal powder injection molding method.

[18] In the eccentric weight according to any one of claims 1 to 17,

The eccentric weight is characterized in that the weight is held in the weight holding portion over the entire circumference.

[19] In the eccentric weight according to any one of claims 1 to 18,

The eccentric weight, wherein the motor shaft holding part has an opening part that opens laterally.

[20] In the eccentric weight according to any one of claims 1 to 19,

The eccentric weight is characterized in that the weight support is made of stainless steel.

[21] In the eccentric weight according to any one of claims 1 to 20,

The eccentric weight is characterized in that the weight is tungsten, tungsten alloy, osmium, osmium alloy, gold, gold alloy, iridium or iridium alloy force.

[22] In the eccentric weight according to any one of claims 1 to 21,

The eccentric weight is an eccentric weight used by being attached to the motor shaft at a portion where the motor body force protrudes.

[23] In the eccentric weight according to any one of claims 1 to 22,

The length of the weight support along the longitudinal direction of the weight is shorter than the length of the weight along the longitudinal direction of the weight. The weight holding portion of the weight support supports the weight in the longitudinal direction of the weight. An eccentric weight characterized by being held at an eccentric position along the axis.

[24] A vibration motor comprising a motor main body and the eccentric weight according to any one of claims 1 to 23.

[25] A motor main body and the eccentric weight according to claim 23,

The vibration motor according to claim 1, wherein the eccentric weight is fixed in a direction in which a distance between the motor shaft holding portion and the motor body approaches the motor body.

26. A portable device comprising the vibration motor according to claim 24 or 25.

[27] A high specific gravity metal weight,

A weight holding portion for holding the weight over a half circumference; a motor shaft holding portion for holding the motor shaft; and a connecting portion for connecting the weight holding portion and the motor shaft holding portion to constitute the weight. An eccentric weight manufacturing method for manufacturing an eccentric weight having a weight support body having a specific gravity lower than that of a high specific gravity metal and having a metallic force,

Producing a weight support by a press drawing method from a plate-like member having a thickness smaller than the length of the motor shaft holding portion along the motor shaft;

And a step of inserting the weight into the weight support.

[28] A high specific gravity metal comprising a weight comprising a high specific gravity metal cover and having a weight holding portion for holding the weight and a motor shaft holding portion for holding the motor shaft, and constituting the weight A first step of preparing a weight support having a lower specific gravity and a metal force; With the weight inserted into the weight support, both side forces in the direction along the motor shaft press the weight to plastically deform the weight, thereby fixing the weight and the weight holding portion. And a second step of producing an eccentric weight.

The method for producing an eccentric weight according to claim 28,

The size of the weight in the first step is such that the average value of the gap between the outer periphery of the weight and the inner periphery of the weight holding portion is 5 μm to 100 when the weight is inserted into the weight support. A method for producing an eccentric weight, wherein the size is within a range of / zm.