WO2006109365A1

WO2006109365A1 - Eccentric weight, vibrating motor, mobile device, and method of manufacturing eccentric weight

Info

Publication number: WO2006109365A1
Application number: PCT/JP2005/024039
Authority: WO
Inventors: Kenichi Shimodaira; Takaomi Tanaka; Yoshito Hirata; Hidehiko Ichikawa; Akira Shimojima; Hikaru Yoshizawa; Kenichi Kusano
Original assignee: Nanshin Co., Ltd.
Priority date: 2005-04-05
Filing date: 2005-12-28
Publication date: 2006-10-19
Also published as: WO2006109350A1

Abstract

An eccentric weight, a vibrating motor, a mobile device, and a method of manufacturing the eccentric weight. The method of manufacturing the eccentric weight (120) comprises a step for integrating the weights (140) formed of a high-density metal with a weight support body (130). The weight support body comprises a weight holding part (134) for holding the weights (140) and a motor shaft holding part (132) for holding a motor shaft and formed of a metallic elastic body with a density lower than that of the high-density metal forming the weights (140). The eccentric weight is characterized in that the weight holding part (134) comprises weight side projected parts (135) so formed that, when the weights (140) are integrated with the weight support body (130), their amounts of projection to the weight (140) side can be reduced. By this eccentric weight (120), the overall weight of the eccentric weight (120) can be reduced, and an eccentric amount in the eccentric weight (120) can be increased. Also, when the eccentric weight (120) is used for a long period, the lowering of the joining of the weight (140) to the weight support body (130) can be suppressed.

Description

Specification

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

Technical field

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. 17 is a view for explaining the first vibration motor 3000 and the first eccentric weight 3020 among the conventional vibration motors. Fig. 17 (a) is a perspective view of vibration motor 3000, Fig. 17 (b) is a sectional view of eccentric weight 3020 cut by a plane perpendicular to motor shaft 3012, and Fig. 17 (c) is an eccentric weight 3020. FIG. 6 is a cross-sectional view taken along a plane along the motor shaft 3012. In FIGS. 17 (b) and 17 (c), the position of the eccentric weight 3020 in FIG. 17 (a) is changed in the rotational direction.

As shown in FIG. 17, the first vibration motor 3000 is composed of a small cylindrical motor 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 attached to the tip of the motor shaft 3012 by crimping 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. (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, a second eccentric weight as shown in FIG. 18 has been proposed as an eccentric weight used in such a vibration motor. FIG. 18 is a diagram for explaining the second eccentric weight. Fig. 18 (a) is a front view of the eccentric weight, Fig. 18 (b) is a cross-sectional view along the line A-A in Fig. 18 (a), and Fig. 18 (c) is a front view of the component parts. FIG. 18 (d) is a cross-sectional view taken along the line BB in FIG. 18 (c). In FIG. 18 (a) and FIG. 18 (b), a part of the motor body 3110 is also shown! /.

As shown in FIG. 18, the second eccentric weight 3120 includes a motor shaft 3112 of the motor body 3110. A cylindrical weight support 3130 having a motor shaft holding hole 3132 for holding and having a low specific gravity metal force, and a substantially half-pipe weight 3140 having a high specific gravity metal force (see, for example, Patent Document 1) ) O 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 arranged at a position where the center force of the motor shaft holding hole 3132 is also separated. As a result, the eccentric amount of the eccentric weight 3120 increases, and by using such a second eccentric weight 3120, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption.

However, in the second eccentric weight 3120 described above, the weight 3140 is integrally bonded and fixed to a part of the outer surface 3134 of the weight support 3130 via the brazing portion 3150. Therefore, when the vibration motor is used for a long time, there is a problem that the reliability of the connection between the weight 3140 and the weight support 3130 is lowered.

Therefore, in order to solve such a problem, instead of the weight support 3130 described above, a weight holding body having a weight holding portion for holding a weight using the elasticity of a metal plate member is provided. It can be considered that an eccentric weight is used. (For example, see Patent Document 2)

[0008] FIG. 19 is a view for explaining a third eccentric weight 3220 disclosed in Patent Document 2 among such eccentric weights. According to the third eccentric weight 3220, the weight support body 3230 having the weight holding part 3234 for holding the weight 3240 using the elasticity of the metal plate-like member is used as the weight support body. Even when the vibration motor is used for a long period of time, it is possible to suppress a decrease in the reliability of the connection between the weight 3240 and the weight support 3230.

Patent Document 1: Japanese Patent Laid-Open No. 2001-129479

Patent Document 2: Japanese Patent Laid-Open No. 2003-245608

Disclosure of the invention

Problems to be solved by the invention

[0010] While using the weight support 3230 that simply uses the elasticity of the metallic plate-like member as in the third eccentric weight 3220 described above, the weight 3240 and the weight support 3230 are used. It is not always possible to sufficiently suppress the decrease in the reliability of bonding with the.

[0011] Therefore, the present invention has been made to solve such a problem, and is light and small. An eccentric weight that can be used suitably for vibration motors that can obtain the required amount of vibration with low power consumption. Even when such vibration motors are used for a long time, the reliability of the connection between the weight and the weight support body An object of the present invention is to provide an eccentric weight in which deterioration of properties is suppressed. Another object of the present invention is to provide a vibration motor and a portable device having such an excellent eccentric weight.

Means for solving the problem

[0012] (1) The eccentric weight of the present invention has a weight made of a high specific gravity metal key, a weight holding part for holding the weight, and a motor shaft holding part for holding the motor shaft, An eccentric weight manufactured by integrally joining a weight support that is an elastic body force of a metal having a specific gravity lower than that of a high specific gravity metal constituting the weight, wherein the weight holding portion includes the weight and the weight. It has a weight-side protruding portion that reduces the amount of protrusion to the weight side when the support is integrated.

[0013] Therefore, according to the eccentric weight described in (1) above, the eccentric weight includes a weight made of a high specific gravity metal and a weight support made of a low specific gravity metal having a lower specific gravity than the high specific gravity metal constituting the weight. Since the eccentric weight is manufactured by integrating the body and the body, 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.

[0014] Further, according to the eccentric weight described in (1) above, since the weight support is a weight support made of an elastic body, the weight is held by the weight holding portion by the elastic force of the entire weight holding portion. It will be. For this reason, when the vibration motor (and eccentric weight) is used for a long time, the reliability of the connection between the weight and the weight support is suppressed, and long-term reliability is reduced by using such an eccentric weight. A high vibration motor can be configured.

[0015] In addition, according to the eccentric weight described in (1) above, when the weight holding portion is integrated with the weight and the weight support, the weight-side protruding portion that reduces the protruding amount to the weight side is provided. Since the weight holding portion has, the weight is held by the weight holding portion with a stronger elastic force to which the elastic force of the weight side protruding portion is added. For this reason, when the vibration motor (and eccentric weight) is used for a long time, it further suppresses the decrease in the reliability of the connection between the weight and the weight support. Therefore, by using such an eccentric weight, a vibration motor with higher long-term reliability can be configured.

[0016] Further, according to the eccentric weight described in (1) above, since the weight support is a weight support made of an elastic body, the motor shaft is held by the motor shaft holding portion by elastic force. . For this reason, when the vibration motor is used for a long time, it is possible to suppress a decrease in the reliability of the connection between the motor shaft and the weight support, and it is possible to configure the vibration motor with high long-term reliability.

[0017] In the eccentric weight described in (1) above, the size of the inner peripheral portion of the weight holding portion before integrating the weight and the weight support is smaller than the size of the outer peripheral portion of the weight. Is preferable. Thus, by inserting the weight into the weight holding portion in a state where the inner peripheral portion is expanded, the weight is held by the weight holding portion by the elastic force of the entire weight holding portion.

[0018] In the eccentric weight described in (1) above, it is preferable that the inner diameter of the motor shaft holding portion is smaller than the outer diameter of the motor shaft. As a result, when the vibration motor is assembled using the eccentric weight described in (1) above, the motor shaft is inserted into the motor shaft holding portion with the inner diameter expanded once, so that the motor shaft after insertion is elastic. With this, it will be held in the motor shaft holder.

In the eccentric weight of the present invention, “integrating a weight and a weight support” includes all bonding of the weight and the weight support by some method.

(2) In the eccentric weight described in (1) above, the weight support is an elastic body manufactured by subjecting a thin metal member to plastic deformation and then performing a hardening treatment. Preferably, it consists of

[0021] By configuring in this way, the weight support manufactured by performing the hardening process after plastic deformation of the thin metal member into a predetermined shape is used, so that the weight support is the weight and the motor shaft. Can be held firmly by the elastic force, and sufficiently suppresses the decrease in the reliability of bonding between the weight and the weight support when the vibration motor (and eccentric weight) is used for a long time. can do. For this reason, a vibration motor with high long-term reliability can be configured by using such an eccentric weight.

[0022] Further, according to the eccentric weight described in the above (2), the thin metal member is plastically deformed into a predetermined shape. Since the weight support manufactured by performing the curing process after the formation is used, the amount of the material constituting the weight support can be made extremely small while maintaining the required strength. As a result, 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.

(3) The eccentric weight described in the above (2) has a Vickers hardness (Hv of the weight support).

) Is preferably 150 or more.

[0024] With this configuration, the weight support body can hold the weight with a strong elastic force and can hold the motor shaft with a strong elastic force. From this point of view, it is more preferable that the Vickers hardness (Hv) of the weight support is 200 or more.

More preferably, it is 0 or more.

(4) In the eccentric weight described in the above (2) or (3), it is preferable that the weight support is manufactured by plastic deformation starting from the motor shaft holding portion. .

[0026] With this configuration, plastic deformation can be performed starting from a portion having a small radius of curvature. Therefore, a weight support can be easily formed, and an eccentric weight can be produced. It becomes possible to improve productivity.

[0027] (5) In the eccentric weight according to any one of (2) to (4), the motor shaft holding part preferably has a structure in which the thin metal member is wound at least twice. .

[0028] With this configuration, the motor shaft can be more firmly held by the motor shaft holding portion, and the motor by the motor shaft holding portion can be used when the vibration motor is used for a long time. It can suppress that the holding | maintenance force of a axis | shaft falls. For this reason, a vibration motor with high long-term reliability can be configured by using such an eccentric weight.

[0029] (6) In the eccentric weight according to any one of (1) to (5), the weight-side protruding portion has a shape in which a width is narrowed by directing toward a tip portion of the weight-side protruding portion. It is preferable to have it.

[0030] With this configuration, when the weight and the weight support are integrated in the manufacturing process of the eccentric weight, the weight protrudes toward the weight as the weight is inserted into the weight support. It becomes possible to push the part gradually outward. For this reason, the operation of inserting the weight into the weight holding portion is facilitated, and the manufacturing cost for manufacturing the eccentric weight can be reduced.

[0031] (7) In the eccentric weight according to any one of (1) to (6), the motor shaft holding portion may be arranged on the motor shaft side when the motor shaft is inserted into the motor shaft holding portion. It is preferable to have a motor shaft side protrusion that reduces the amount of protrusion.

With this configuration, the motor shaft is held by the motor shaft holding portion with a stronger elastic force to which the elastic force of the motor shaft side protruding portion is added. For this reason, when the vibration motor is used for a long time, it is possible to suppress a decrease in the reliability of the connection between the motor shaft and the weight support, and thus a vibration motor with high long-term reliability can be configured.

[0033] (8) In the eccentric weight described in (7) above, it is preferable that the motor shaft side protruding portion has a shape in which the width is narrowed toward the tip of the motor shaft side protruding portion.

With this configuration, when the eccentric weight is attached to the motor shaft during the manufacturing process of the vibration motor, the motor shaft is inserted into the motor shaft holding portion when the motor shaft is inserted into the motor shaft holding portion. As it is inserted, the motor shaft can gradually push the motor shaft side protrusion outward. For this reason, when the vibration motor is used for a long period of time, it is possible to suppress a decrease in the reliability of the connection between the motor shaft and the weight support, and thus it is possible to configure the vibration motor with high long-term reliability. .

[0035] (9) In the eccentric weight according to any one of (1) to (8), the weight has a recess for receiving the weight side protrusion at a portion corresponding to the weight side protrusion. It is preferable that

[0036] With this configuration, it is possible to prevent the weight from being separated from the weight holding portion force by locking the recess formed in the weight and the weight side protruding portion. . 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. A higher vibration motor can be constructed.

[0037] (10) The eccentric weight of the present invention has a weight made of a high specific gravity metal and the weight is retained. A metal plate holding portion and a motor shaft holding portion for holding the motor shaft, and a sheet metal member having a specific gravity lower than that of the high specific gravity metal constituting the weight is plastically deformed into a predetermined shape and then subjected to a hardening process. An eccentric weight manufactured by integrating a weight support made of an elastic body manufactured by the method, wherein the weight support holds the weight when the motor shaft is inserted into the motor shaft holding portion. The portion has a structure that holds the weight with a stronger elastic force.

[0038] For this reason, according to the eccentric weight described in (10) above, the eccentric weight is made of a weight made of a high specific gravity metal and a specific gravity lower than that of a high specific gravity metal constituting the weight! Since the eccentric weight is manufactured by integrally joining the weight support made of metal, 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.

[0039] Furthermore, according to the eccentric weight described in (10) above, since the weight support body is a weight support body made of an elastic body, the weight is held by the weight holding portion by elastic force. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to suppress a decrease in the reliability of the connection between the weight and the weight support.By using such an eccentric weight, long-term reliability can be improved. High vibration motors can be constructed.

[0040] Further, according to the eccentric weight described in the above (10), the weight support manufactured by subjecting the thin metal member to plastic deformation to a predetermined shape and then performing a hardening treatment is used. The weight support body can hold the weight and the motor shaft firmly by elastic force, and when the vibration motor (and eccentric weight) is used for a long time, the reliability of the connection between the weight and the weight support body is improved. It can suppress sufficiently that it falls. For this reason, a vibration motor with high long-term reliability can be configured by using such an eccentric weight.

[0041] Further, according to the eccentric weight described in the above (10), since a thin plate metal member is plastically deformed into a predetermined shape and then subjected to hardening treatment, it is used as a weight support made of an elastic body. Thus, the amount of the material constituting the weight support can be made extremely small while maintaining the required strength. As a result, 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. By virtue of this, it is possible to configure a vibration motor that can obtain the required amount of vibration with lighter and less power consumption.

[0042] Furthermore, according to the eccentric weight described in (10) above, when the weight support is inserted into the motor shaft holding portion, the weight holding portion holds the weight with a stronger elastic force. Since the weight support body has such a structure, the weight is held by the weight holding portion with a stronger elastic force when the motor shaft is inserted into the motor shaft holding portion. For this reason, when the vibration motor (and the eccentric weight) 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, so that such an eccentric weight is used. Thus, a vibration motor with higher long-term reliability can be configured.

[0043] (11) The eccentric weight of the present invention has a weight made of a high specific gravity metal key, a weight holding portion for holding the weight, and a motor shaft holding portion for holding the motor shaft, Manufactured by integrating a thin plate metal member having a specific gravity lower than that of the high specific gravity metal that composes the weight into a predetermined shape and then integrating it with a weight support made of an elastic body. It is an eccentric weight, and the weight support body has a structure in which a space defined by the motor shaft holding portion is reduced when the weight and the weight support body are integrated together.

[0044] For this reason, according to the eccentric weight described in (11) above, the eccentric weight is made of a weight made of a high specific gravity metal and a specific gravity lower than that of the high specific gravity metal constituting the weight! Since the eccentric weight is manufactured by integrally joining the weight support made of metal, 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.

Further, according to the eccentric weight described in (11) above, since the weight support body is a weight support body made of an elastic body, the weight is held by the weight holding portion by elastic force. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to suppress a decrease in the reliability of the connection between the weight and the weight support.By using such an eccentric weight, long-term reliability can be improved. High vibration motors can be constructed.

[0046] According to the eccentric weight described in (11) above, the thin metal member is plastically deformed into a predetermined shape. Since the weight support manufactured by performing the curing process after being formed is used, the weight support can hold the weight and the motor shaft firmly by elastic force, and the vibration motor ( Further, it is possible to sufficiently suppress the decrease in the reliability of the connection between the weight and the weight support when the eccentric weight is used for a long time. For this reason, a vibration motor with high long-term reliability can be configured by using such an eccentric weight.

[0047] Further, according to the eccentric weight described in the above (11), since a thin plate metal member is plastically deformed into a predetermined shape and then subjected to hardening treatment, it is used as a weight support made of an elastic body. Thus, the amount of the material constituting the weight support can be made extremely small while maintaining the required strength. As a result, 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.

[0048] Furthermore, according to the eccentric weight described in (11) above, when the weight support is integrated with the weight and the weight support, the space defined by the motor shaft holding portion is reduced. Since the weight support body has a structure, the motor shaft is held by the motor shaft holding portion with a stronger elastic force when the weight and the weight support body are integrated. 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 motor shaft and the weight support, and thus it is possible to configure a vibration motor with higher long-term reliability. it can.

[0049] (12) In the eccentric weight described in (10) or (11) above, the weight hardness (Hv) of the weight support is preferably 150 or more.

With this configuration, the weight support can hold the weight with a strong elastic force and can hold the motor shaft with a strong elastic force. From this point of view, it is more preferable that the Vickers hardness (Hv) of the weight support is 200 or more.

More preferably, it is 0 or more.

[0051] (13) In the eccentric weight according to any one of (1) to (12), it is preferable that the weight holding portion holds the weight over the entire outer peripheral portion of the weight.

[0052] With this configuration, when the vibration motor (and eccentric weight) is used for a long time Further, it is possible to further sufficiently suppress the decrease in the reliability of bonding between the weight and the weight support. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor with high long-term reliability.

In this case, “the entire outer peripheral portion” refers to the entire outer periphery of the weight in a plane perpendicular to the longitudinal direction of the weight (that is, a plane perpendicular to the motor shaft). Further, in the eccentric weight of the present invention, the weight may be held in the weight holding portion throughout the longitudinal direction of the weight, but is not necessarily held in the weight holding portion throughout the longitudinal direction of the weight. ,.

[0054] (14) In the eccentric weight according to (2), (3), (4), (5), (10), (11) or (12), the weight support is the weight. It is preferable that the notched portion provided between the holding portion and the motor shaft holding portion has a structure in which the thin metal member intersects!

With this configuration, the weight support body can hold the weight and the motor shaft more firmly by the elastic force. In other words, when the weight holding part and the weight are integrated together, the weight pushes the inner peripheral part of the weight holding part outward, and as a result, the inner peripheral part of the motor shaft holding part is narrowed. Works. In addition, when the motor shaft is inserted into the motor shaft holding part, the motor shaft is in a state of pushing the inner peripheral part of the motor shaft holding part outward, so that the inner peripheral part of the weight holding part is restricted. To do. The synergistic effect of these actions makes it possible to hold the weight more firmly on the weight holding part, and it is possible to hold the motor shaft more firmly on the motor shaft holding part. For this reason, when the vibration motor (and eccentric weight) is used for a long time, the reliability of the connection between the weight and the weight support and the decrease in the reliability of the connection between the motor shaft and the weight support are further suppressed. Therefore, by using such an eccentric weight, it is possible to configure a vibration motor with higher long-term reliability.

[0056] Speaking of this viewpoint, it is preferable that the size of the inner peripheral portion of the weight holding portion before the weight and the weight support are integrated is smaller than the size of the outer peripheral portion of the weight. Further, it is preferable that the inner diameter of the motor shaft holding portion is smaller than the outer shape of the motor shaft.

[0057] (15) In the eccentric weight according to any one of (1) to (14), the weight support is a weight that holds the weight from one side or both sides in a direction along the motor shaft. It is preferable to have a holding frame.

By configuring in this way, the weight support can hold the weight from one side or both sides in the direction along the motor shaft. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to further suppress the reduction in the reliability of the connection between the weight and the weight holding portion. Therefore, it is possible to configure a vibration motor with higher long-term reliability.

[0059] (16) In the eccentric weight described in (1) to (15) above, it is preferable that the weight has a weight having a circular cross section in a plane orthogonal to a direction along the motor shaft.

[0060] With this configuration, the weight can be inserted into the weight holding portion from either end side of the weight holding portion, so that it is possible to freely place the weight in the weight holding portion. The degree is increased and workability is improved. In addition, since the weight is a simple columnar shape, it becomes possible to use a sintered body having a round bar force cut short as it is, and it becomes easy to manufacture the weight. For this reason, the manufacturing cost at the time of manufacturing an eccentric weight can be made low.

[0061] (17) In the eccentric weight according to any one of the above (1) to (16), the thin plate metal member has one or more holes for lightening the weight support. Is preferably provided.

[0062] With this configuration, it is possible to further reduce the amount of the material constituting the weight support while maintaining the required strength, and to further increase the amount of eccentricity in the eccentric weight. 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.

[0063] (18) In the eccentric weight according to any one of (1) to (17), the thickness of the thin metal member is preferably in the range of 0.05 mm to 0.5 mm. .

That is, if the thickness of the thin metal member is less than 0.05 mm, the strength required for the weight support may not be obtained, and if the thickness of the thin metal member exceeds 0.5 mm, This is because if the total weight of the weight support is reduced and the eccentric amount of the eccentric weight can be further increased, the effect may not be obtained. From these viewpoints, the thickness of the thin metal member is 0.008mn! More preferably within the range of ~ 0.3mm Good.

[0065] (19) In the eccentric weight according to any one of (1) to (18), a length of the weight holding portion along a longitudinal direction of the weight is shorter than the weight. The part preferably holds the weight at a position eccentric along the longitudinal direction of the weight.

[0066] With this configuration, when the eccentric weight is attached to the motor shaft, the distance between the motor weight holding portion of the eccentric weight and the bearing of the motor body can be reduced, so that the motor shaft It is possible to suppress the deflection of the motor shaft when rotating. As a result, the eccentric weight rotates more stably, and the eccentric vibration characteristics of the vibration motor are improved.

[0067] (20) In the eccentric weight according to any one of the above (1) to (19), the thin plate metal part is made of a metal having quenching hardenability, a metal having age hardenability, and work hardenability. It is preferable to have a metal or shape memory alloy power.

[0068] In this way, by configuring a weight support or a motor shaft support using a quench-hardening metal, an age-hardening metal, a work-hardening metal, or a shape memory alloy, When manufacturing the weight support, the weight support or the motor shaft support can be sufficiently cured, and it is possible to manufacture a highly reliable eccentric weight and vibration motor.

[0069] Further, a weight support or a motor shaft support is formed by using a metal having quench hardening property, a metal having age hardening property, a metal having work hardening property, or a shape memory alloy, thereby forming a weight. It becomes possible to give a predetermined elastic force to the support body or the motor shaft support body.

[0070] Examples of the metal having quenching hardenability include martensitic stainless steel. Since martensitic stainless steel is originally a material with high corrosion resistance and resistance to glare, it is not necessary to apply plating to the entire eccentric weight. For this reason, the joint portion between the eccentric weight and the plating film and the plating itself are not cracked, and it is possible to suppress a decrease in the reliability related to holding the motor shaft in the motor shaft holding portion.

[0071] Further, since martensitic stainless steel is more viscous than tungsten, tungsten alloys, and the like, it is brittle and fragile. By holding the weight with martensitic stainless steel, a material constituting the weight is obtained. The problem of being easily broken can also be suppressed. [0072] In addition, since martensitic stainless steel is less expensive than tungsten or tungsten alloys, it is possible to manufacture an eccentric weight by forming a shaft body with such relatively inexpensive martensitic stainless steel. Cost can be reduced.

[0073] Examples of martensitic stainless steels include SUS403, SUS410, SUS416, SUS420, SUS429, SUS431, and SUS440. In this case, the quenching process gives a Vickers hardness (Hv) of about 300-600.

[0074] Examples of age-hardening metals include precipitation hardening stainless steel, beryllium copper alloy, nickel manganese copper alloy, precipitation hardening titanium alloy, and aluminum alloy.

[0075] When the age-hardening metal is a precipitation hardening stainless steel, the same effect as in the case of the martensitic stainless steel described above is obtained, and moreover than in the case of the martensitic stainless steel. If the corrosion resistance is excellent, the effect is obtained. Examples of precipitation hardening stainless steel include SUS630 and SUS631. In this case, a value S of about 300 to 450 is obtained as a Vickers hardness (Hv) by precipitation hardening at 420 ° C. for 2 hours.

[0076] When the age-hardening metal is a beryllium copper alloy, the effects of easy plastic deformation and excellent mechanical strength after precipitation hardening are obtained. An example of the beryllium copper alloy is a beryllium copper alloy containing 0.8% to 4.0% (more preferably 1.5% to 3.5%) of beryllium. In this case, a Vickers hardness (Hv) of about 200 to 350 is obtained by precipitation hardening for 2 hours at 320 ° C to 330 ° C.

[0077] Even when the age-hardening metal is a nickel manganese copper alloy (nickel manganese white), the effect of easy plastic deformation and excellent mechanical strength after precipitation hardening can be obtained. An example of the nickel manganese copper alloy is a nickel manganese copper alloy containing about 20% nickel and about 20% manganese, with the balance being copper. In this case, a Vickers hardness (Hv) of about 420 is obtained by precipitation hardening for 2 hours at 400 ° C.

[0078] Even when the age-hardening metal is a precipitation hardening titanium alloy, the effects of easy plastic deformation and excellent mechanical strength after precipitation hardening can be obtained. Precipitation hardening Since the titanium alloy has a relatively low specific gravity, it is possible to further reduce the total weight of the weight support and further increase the amount of eccentricity in the eccentric weight. For this reason, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter weight and less power consumption. Low specific gravity precipitation-hardening titanium alloys include titanium alloys containing approximately 6% aluminum and approximately 4% vanadium (Ti-6A1-4V) and titanium alloys including approximately 6% aluminum and approximately 2% vanadium (Ti — 6A1— 2V). In this case, a value of about 300 Vickers hardness (Hv) can be obtained by precipitation hardening for 2 hours at 450 ° C.

[0079] When the age-hardening metal is an aluminum alloy, the effects of easy plastic deformation and excellent corrosion resistance and mechanical strength can be obtained. Since the aluminum alloy has a lower specific gravity than other metals, the total weight of the weight support can be further reduced and the amount of eccentricity in the eccentric weight can be further increased. For this reason, it is possible to configure a vibration motor that can obtain a necessary vibration amount with less power consumption and less power. Aluminum alloys include Al-Cu aluminum alloys (duralumin), Al-Mn aluminum alloys, A1-Mg aluminum alloys, A1-Mg-Si aluminum alloys or Al-Zn aluminum alloys. Can be illustrated.

[0080] Various metals including stainless steel can be used as the work-hardening metal.

[0081] In this case, the weight support can have the necessary elasticity by cold rolling at room temperature (for example, 30 to 80% rolling).

[0082] As the shape memory alloy, a nickel titanium alloy or a copper zinc aluminum alloy can be exemplified.

[0083] When the shape memory alloy is a nickel titanium alloy, an effect that the corrosion resistance is superior to that of martensitic stainless steel is obtained. In addition, since the nickel titanium alloy has a relatively low specific gravity, the total weight of the weight support can be further reduced and the amount of eccentricity in the eccentric weight can be further increased. For this reason, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[0084] When the shape memory alloy is a copper zinc aluminum alloy, substantially the same effect as that of the nickel titanium alloy described above can be obtained, and the specific gravity is further lower, so It is possible to further reduce the weight and further increase the amount of eccentricity in the eccentric weight. For this reason, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[0085] (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.

[0086] 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.

In the eccentric weight of the present invention, as the weight, a metal having a specific gravity higher than that of the metal constituting the weight support, such as silver, copper, brass, lead, molybdenum, or nickel, in addition to the above metal. It is also preferable to use. The metal constituting the weight can be appropriately selected from viewpoints such as ease of processing, cost, and corrosion resistance. When a material with a relatively low specific gravity is used, the necessary eccentricity can be obtained by increasing the volume of the weight.

[0088] Further, 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.

(22) A vibration motor according to the present invention includes a motor main body and the eccentric weight according to any one of (1) to (21).

Therefore, according to the vibration motor of the present invention, as described above, the 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. In addition, when this type of vibration motor is used for a long period of time, it is equipped with an excellent eccentric weight that sufficiently suppresses the decrease in the reliability of the connection between the weight and the weight support. In addition, the required amount of vibration can be obtained with power consumption, and the vibration motor is reliable for a long time.

(23) In the vibration motor according to (22), the weight holding portion in which the weight holding portion along the longitudinal direction of the weight is shorter than the weight is used as the eccentric weight. An eccentric weight for holding the weight at an eccentric position along the longitudinal direction of the weight is provided, and the eccentric weight is closer to the motor body in a direction in which the distance between the motor shaft holding portion and the motor body is closer. Preferred to be fixed to ,.

[0092] By configuring in this way, the distance between the motor weight holding portion of the eccentric weight and the bearing of the motor main body is reduced, so that the motor shaft is prevented from being bent when the motor shaft rotates. Can do. As a result, the eccentric weight rotates more stably, and the eccentric vibration characteristics of the vibration motor are improved.

(24) A portable device of the present invention is characterized by including the vibration motor according to (22) or (23).

[0094] For this reason, according to the portable device of the present invention, the required amount of vibration can be obtained with light weight and low power consumption, and since the vibration motor with high reliability for a long time is provided, light weight and low power consumption are required. A large amount of vibration can be obtained, long-term reliability is high, and it becomes a portable device.

(25) An eccentric weight manufacturing method according to the present invention is an eccentric weight manufacturing method for manufacturing an eccentric weight according to claim 1, wherein a process corresponding to the weight side protruding portion is performed. A first step of producing a weight support precursor having substantially the same shape as the weight support by plastically deforming the thin sheet metal member, and by subjecting the weight support precursor to a curing treatment. The method includes a second step of manufacturing the weight support and a third step of integrating the weight and the weight holding portion in the weight support.

[0096] Therefore, according to the method of manufacturing the eccentric weight described in (25) 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. [0097] Further, according to the eccentric weight manufacturing method described in (25) above, since the weight support is manufactured through a step of plastically deforming the thin metal member into a predetermined shape, the thin weight metal member is manufactured. It is possible to manufacture a weight support, which can reduce the total weight of the eccentric weight and further increase the amount of eccentricity in the eccentric weight.

[0098] Further, according to the method of manufacturing the eccentric weight described in (25) above, the thin plate metal member is hardened to form the weight support, so that the weight support includes the weight and the motor shaft. It becomes possible to hold firmly, and when the vibration motor (and eccentric weight) is used for a long time, it is possible to sufficiently suppress the reduction of the holding force of the weight and the motor shaft by the weight support. . Therefore, by using such an eccentric weight, it is possible to configure a vibration motor with high long-term reliability.

[0099] Furthermore, according to the method of manufacturing the eccentric weight described in (25) above, since the weight holding portion having the weight side protruding portion is formed, the weight has the elastic force of the weight side protruding portion. In addition, it is possible to hold the weight holding portion with a stronger elastic force. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to further suppress the reduction in the reliability of the connection between the weight and the weight support, and thus by using such an eccentric weight, In addition, a vibration motor with higher long-term reliability can be configured.

[0100] (26) In the method for producing an eccentric weight according to the above (25), the second step is to perform a Vickers hardness (Hv) by subjecting the weight support precursor to a curing treatment. A method for producing an eccentric weight, characterized in that the weight support is 150 or more.

[0101] By adopting such a method, the weight support can hold the weight with a strong elastic force and can hold the motor shaft with a strong elastic force. From this point of view, the Vickers hardness (Hv) of the weight support is preferably 200 or more, more preferably 250 or more.

[0102] (27) In the method of manufacturing the eccentric weight according to (25) or (26), in the first step, the size of the inner peripheral portion of the weight support portion is equal to the outer peripheral portion of the weight. The thin metal member is plastically deformed so as to be larger than the size, and the eccentric weight is produced by the method of manufacturing the eccentric weight in a state in which the weight is inserted into the weight support and the double side force in the direction along the motor shaft is applied. By pressing and plastically deforming the weight, the weight Preferably, the method further includes a fourth step including a step of fixing the weight holding portion to the weight holding portion.

[0103] By adopting such a method, the size of the inner peripheral portion of the weight support portion becomes larger than the size of the outer peripheral portion of the weight, so that it becomes easy to insert the weight into the weight support body, and the eccentric weight. It becomes possible to improve productivity at the time of manufacturing.

[0104] Further, since the weight and the weight holding portion are fixed by pressing the weight and plastically deforming, the weight is firmly held by the weight holding portion by the elastic force of the weight holding portion. 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.

Brief Description of Drawings

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

FIG. 2 is a view for explaining a method of manufacturing the eccentric weight 120 according to the first embodiment.

FIG. 3 is a view for explaining the vibration motor 100 according to the first embodiment.

FIG. 4 is a view for explaining an eccentric weight 220 according to Embodiment 2.

FIG. 5 is a view for explaining an eccentric weight 320 according to Embodiment 3.

FIG. 6 is a view for explaining an eccentric weight 420 according to Embodiment 4.

FIG. 7 is a view for explaining an eccentric weight 520 according to a fifth embodiment.

FIG. 8 is a view for explaining an eccentric weight 620 according to a sixth embodiment.

FIG. 9 is a perspective view of an eccentric weight 720 according to Embodiment 7.

FIG. 10 is a view for explaining an eccentric weight 820 according to an eighth embodiment.

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

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

FIG. 13 is a view for explaining a method of manufacturing the eccentric weight 1020 according to the tenth embodiment.

FIG. 14 is a view for explaining a vibration motor 1000 according to the tenth embodiment.

FIG. 15 is a view for explaining an eccentric weight 1120 according to the eleventh embodiment.

FIG. 16 is a schematic view for explaining the method of manufacturing the eccentric weight 1120 according to the eleventh embodiment.

FIG. 17 is a diagram shown for explaining the first vibration motor 3000 and the first eccentric weight 3020. is there.

FIG. 18 is a view for explaining a second eccentric weight 3120.

FIG. 19 is a view for explaining a third eccentric weight 3220.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the eccentric weight, vibration motor, portable device, and manufacturing method of the eccentric weight according to the present invention will be described based on the embodiments shown in the drawings.

[Embodiment 1]

FIG. 1 is a view for explaining an eccentric weight 120 according to the first embodiment. Fig. 1 (a) is a view of the weight support 130 of the eccentric weight 120 as viewed from the front, and Fig. 1 (b) is a view of the weight support 130 of the eccentric weight 120 viewed from the side. ) Is a view of the weight support 130 of the eccentric weight 120 from the bottom, and Fig. 1 (d) is a cross-sectional view taken along the line A1-A1 in Fig. 1 (a). FIG. 1 (f) is a perspective view of an eccentric weight 120. FIG.

FIG. 2 is a view for explaining the method of manufacturing the eccentric weight 120 according to the first embodiment. FIG. 2 (a) to FIG. 2 (h) are diagrams showing each step.

As shown in FIGS. 1 and 2, the eccentric weight 120 according to the first embodiment is manufactured by integrally joining two weights 140 having a circular cross section and a weight support 130. Is an eccentric weight. Weight 140 is made of high specific gravity metal. The weight support 130 also has an elastic force of a metal 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 for holding the weight 140 and a motor shaft holding part 132 for holding the motor shaft 112 (see FIG. 3). The weight holding part 134 has a weight side protruding part 135 that reduces a protruding amount force S toward the weight 140 when the weight 140 and the weight support 130 are assembled together. As shown in FIG. 2, the weight support 130 is a weight support manufactured by plastically deforming the thin metal member 130a into a predetermined shape and then performing a hardening process.

[0109] 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. Since the eccentric weight 120 is manufactured by combining with 130, the total weight of the eccentric weight 120 can be reduced and the amount of eccentricity in the eccentric weight 120 can be increased. wear. 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.

[0110] Further, according to the eccentric weight 120 according to the first embodiment, since the weight support 130 is a weight support made of an elastic body, the weight is used when the vibration motor (and the eccentric weight 120) is used for a long time. It can suppress that the reliability of joining of 140 and the weight support body 130 falls. Therefore, by using such an eccentric weight 120, it is possible to configure a vibration motor with high long-term reliability.

[0111] Further, according to the eccentric weight 120 according to the first embodiment, when the weight holding part 134 is integrally formed with the weight 140 and the weight support body 130, the weight amount that protrudes toward the weight 140 side becomes smaller. Since the weight holding portion having the side protrusion 135 is used, the weight 140 is held by the weight holding portion 134 with a stronger elastic force to which the elastic force of the weight side protrusion 135 is applied. For this reason, it is possible to further suppress the decrease in the reliability of the connection between the weight 140 and the weight support 130 when the vibration motor (and the eccentric weight 120) is used for a long time. By using 120, a vibration motor with higher long-term reliability can be configured.

[0112] Further, according to the eccentric weight 120 according to the first embodiment, the weight support 130 is a weight support made of an elastic body, so that the motor shaft 112 (see Fig. 3) is held by the elastic force. Part 1 32 will be held. For this reason, when the vibration motor is used for a long time, it is possible to suppress a decrease in the reliability of joining between the motor shaft 112 and the weight support 130, and it is possible to configure the vibration motor with high long-term reliability.

[0113] In the eccentric weight 120 according to the first embodiment, the size of the inner peripheral portion of the weight holding portion 134 before the weight 140 and the weight support 130 are integrated is larger than the size of the outer peripheral portion of the weight 140. It is small. As a result, the weight 140 is inserted into the weight holding part 134 in a state where the inner peripheral part is expanded, so that the weight 140 is held by the weight holding part 134 by the elastic force of the entire weight holding part 134. Become.

In the eccentric weight 120 according to the first embodiment, it is preferable that the inner diameter of the motor shaft holding portion 132 be smaller than the outer diameter of the motor shaft 112 (see FIG. 3). As a result, when assembling the vibration motor 100 (see Fig. 3 (a)) using the eccentric weight 120, the motor shaft is maintained. By inserting the motor shaft 112 into the holding portion 132, the motor shaft 112 is held by the motor shaft holding portion 132 by an elastic force.

[0115] In the eccentric weight 120 according to the first embodiment, the weight side protrusion 135 has a structure in which the width is narrowed toward the tip of the weight side protrusion 135.

Therefore, according to the eccentric weight 120 according to the first embodiment, when the weight 140 and the weight support 130 are integrated in the manufacturing process of the eccentric weight 120, the weight side protrusion of the weight support 130 protrudes. As the weight 140 is inserted into the wide side force of the portion 135, the weight 140 gradually pushes the weight side protruding portion 135 outward. For this reason, the operation of inserting the weight 140 into the weight holding portion 134 is facilitated, and the manufacturing cost for manufacturing the eccentric weight 120 can be reduced.

Further, in the eccentric weight 120 according to the first embodiment, the motor shaft holding part 132 inserts the motor shaft 112 into the motor shaft holding part 132 as shown in FIGS. 1 (a) and 1 (d). In this case, the motor shaft side protruding portion 133 has a small amount of protrusion to the motor shaft 112 side.

[0118] Therefore, according to the eccentric weight 120 according to the first embodiment, the motor shaft 112 is held by the motor shaft holding portion 132 by a stronger elastic force to which the elastic force of the motor shaft side protruding portion 133 is added. become. For this reason, it is possible to suppress a decrease in the reliability of the joint between the motor shaft 112 and the weight support 130 when the vibration motor is used for a long time. can do.

In the eccentric weight 120 according to the first embodiment, the motor shaft side protruding portion 133 has a shape whose width is narrowed by applying a force toward the tip of the motor shaft side protruding portion 133.

Therefore, according to the eccentric weight 120 according to the first embodiment, when the eccentric weight 120 is attached to the motor shaft in the manufacturing process of the vibration motor, the width of the weight side protruding portion 133 of the motor shaft holding portion 132 is When the motor shaft 112 is inserted from the wide side, the motor shaft 112 gradually pushes the motor shaft side protruding portion 133 outward as the motor shaft 112 is inserted into the motor shaft holding portion. . For this reason, when the vibration motor is used for a long period of time, it is possible to suppress a decrease in the reliability of the connection between the motor shaft and the weight support, and thus it is possible to configure the vibration motor with high long-term reliability. .

[0121] In the eccentric weight 120 according to Embodiment 1, the weight support 130 has two weights 140. In order to hold the two weights 140 so as to surround the outer peripheral force. This part is called a weight holding part 134. In addition, the weight support 130 has a shape that surrounds the motor shaft 112 with an outer peripheral force in order to hold the motor shaft 112. This part is called a motor shaft holding part 132.

[0122] In the eccentric weight 120 according to the first embodiment, the weight 140 is held by the weight holding portion 134 over the entire outer peripheral portion (see FIG. 1 (f).) ₀

[0123] For this reason, it is possible to sufficiently suppress a decrease in the reliability of joining of the weight 140 and the weight support 130 when the vibration motor (and the eccentric weight 120) is used for a long time. Therefore, by using such an eccentric weight 120, a vibration motor with high long-term reliability can be configured.

In this case, the “entire outer peripheral portion” means the entire outer periphery of the weight 140 on a plane perpendicular to the longitudinal direction of the weight 140 (ie, a plane perpendicular to the motor shaft 112). Further, in the eccentric weight of the present invention, the weight 140 may be held in the weight holding portion over the entire longitudinal direction of the weight 140, but as in the case of the eccentric weight 120 according to the first embodiment, it is not always necessary. It is not necessary that the weight 140 is held by the weight holding portion 134 over the entire length of the weight 140 (see FIG. 1 (f);).

In the eccentric weight 120 according to the first embodiment, as shown in FIG. 2, the weight support body 130 is plastically deformed starting from the motor shaft holding portion 132.

[0126] Therefore, as described later, since it is possible to plastically deform from a portion having a small radius of curvature, the weight support 134 can be easily formed, and an eccentric weight is produced. Productivity can be improved.

In the eccentric weight 120 according to the first embodiment, as shown in FIG. 2, the motor shaft holding portion 132 is formed by wrapping a thin metal member twice.

[0128] Therefore, the motor shaft holding part 132 can hold the motor shaft 112 firmly, and when the vibration motor is used for a long time, the holding force of the motor shaft 112 by the motor shaft holding part 132 is reduced. It can suppress that it falls. Therefore, by using such an eccentric weight 120, a vibration motor with high long-term reliability can be configured.

In the eccentric weight 120 according to the first embodiment, the weight support 130 is the weight holding portion 134. And a notch 137a, 137b (see Fig. 2 (a)) provided between the motor shaft holding part 132 and V and a sheet metal member intersect! (See (e).)

[0130] Therefore, the weight support 130 can hold the weight 140 and the motor shaft 112 (see FIG. 3) more firmly by the elastic force. That is, when the weight holding part 134 and the weight 140 are integrated, the weight 140 pushes the inner peripheral part of the weight holding part 134 outward. As a result, the inner peripheral part of the motor shaft holding part 132 is narrowed. Acts like a whole. Further, when the motor shaft is inserted into the motor shaft holding portion 132, the motor shaft 112 is in a state of pushing the inner peripheral portion of the motor shaft holding portion 132 outward. As a result, the inner peripheral portion of the weight holding portion 134 is It works to narrow down. Due to the synergistic effect of these actions, the weight 140 can be held more firmly by the weight holding part 134, and the motor shaft 112 can be held more firmly by the motor shaft holding part 132. For this reason, when a vibration motor (and eccentric weight) is used for a long time, the reliability of the connection between the weight 140 and the weight support 134 and the reliability of the connection between the motor shaft 112 and the weight support 134 are reduced. Since this can be further suppressed, by using such an eccentric weight 120, it is possible to configure a vibration motor with higher long-term reliability.

[0131] In the eccentric weight 120 according to the first embodiment, as described above, the weight support 130 is an elastic body force produced by subjecting the thin metal member 130a to plastic deformation and then performing a hardening process. (See Figure 2).

[0132] For this reason, according to the eccentric weight 120 according to the first embodiment, the weight support body 130 manufactured by performing a hardening process after plastically deforming the thin metal member 130a into a predetermined shape is used. As a result, the weight support body 130 can hold the weight 140 and the motor shaft 112 more firmly by the elastic force, and the weight 140 and weight when the vibration motor (and the eccentric weight) are used for a long time. It can be sufficiently suppressed that the reliability of bonding with the support 130 is lowered. Therefore, by using such an eccentric weight 120, it is possible to configure a vibration motor with high long-term reliability.

[0133] Therefore, according to the eccentric weight 120 according to the first embodiment, the amount of the material constituting the weight support 130 can be made extremely small while maintaining the required strength. This reduces the total weight of the eccentric weight 120 and reduces the amount of eccentricity in the eccentric weight 120. It can be made even larger. For this reason, by using such an eccentric weight 120, it is possible to configure a vibration motor that can obtain a necessary amount of vibration with lighter and less power consumption.

[0134] In the eccentric weight 120 according to the first embodiment, the Vickers hardness (HV) of the weight support 130 is 150 or more.

With this configuration, the weight support 130 can hold the weight 140 with a strong elastic force and can hold the motor shaft 112 with a strong elastic force. Speaking also from this viewpoint, the Vickers hardness (Hv) of the weight support 130 is preferably 200 or more, more preferably 250 or more.

[0136] In the eccentric weight 120 according to the first embodiment, the thickness of the thin metal member 130a is 0.1 mm. Therefore, while maintaining the strength required for the weight support 130, the total weight of the weight support 130 can be reduced and the amount of eccentricity in the eccentric weight 120 can be further increased.

In the eccentric weight 120 according to the first embodiment, as shown in FIG. 1 (d), the length along the motor shaft 112 in the weight 140 (along the longitudinal direction of the weight 140) is 4 mm. is there. Further, the length along the motor shaft 112 in the weight holder 134 of the weight support 130 is also 4 mm, and the length along the motor shaft 112 in the motor shaft holder 132 of the weight support 130 is also 4 mm.

Therefore, in the eccentric weight 120 according to the first embodiment, the weight 140 is held by the weight holding portion 134 in the weight support 130 in all the lengths (4 mm) along the length direction of the weight 140. ing. As a result, the weight 140 is firmly held on the weight support 130.

In the eccentric weight 120 according to the first embodiment, as shown in FIG. 1, the weight 140 has a circular cross section. For this reason, the weight 140 can be inserted into the weight holding part 134 from either end (refer to the end SI and S2 shown in Fig. 1 (b). The degree of freedom is improved when placing 140. Also, the weight 140 is a simple cylindrical shape, so a sintered body made of a round bar must be cut as it is. And easy to manufacture the weight 140 Become. For this reason, the manufacturing cost at the time of manufacturing the eccentric weight 120 can be made low.

[0140] In the eccentric weight 120 according to the first embodiment, the weight 140 is made of a tungsten sintered alloy, and the weight support 130 is made of martensitic stainless steel having a specific gravity lower than that of the tungsten alloy.

[0141] For this reason, since the weight support 130 is also a martensitic stainless steel after the elastic hardening treatment, the durability of the weight support 130 is improved, and the weight support 130 and the weight 140 are In addition, the reliability of bonding between the weight 140 and the weight support 130 is further reduced when the vibration motor (and the eccentric weight 120) is used for a long time. Can be suppressed. Therefore, by using such an eccentric weight 120, a vibration motor with high long-term reliability can be configured.

[0142] Further, since martensitic stainless steel is a material having relatively high corrosion resistance and resistance to cracking, even if it is used as a weight support, it is not necessary to apply a plating. As a result, the joint between the weight support 130 and the plating film and the plating film itself are not cracked, and no cracks are generated due to cracks. It can suppress that the reliability regarding the holding | maintenance of the motor shaft 112 falls.

[0143] In addition, martensitic stainless steels are more viscous than tungsten alloys, so brittle and fragile weights 140 such as tungsten alloys are retained throughout the circumference with viscous martensitic stainless steels. By doing so, the weight can be easily broken!

[0144] Further, since martensitic stainless steel is cheaper than tungsten alloys and the like, the weight support 130 is made of such relatively inexpensive martensitic stainless steel, so that the eccentric weight 120 of It becomes easy to lower the manufacturing cost.

[0145] 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. [0146] In the eccentric weight 120 according to the first embodiment, the weight 140 itself does not need a function for holding the motor shaft 112. Therefore, the weight is extremely simple (cylindrical shape). Is adopted.

[0147] As a manufacturing method of the weight 140, a manufacturing method in which a tungsten alloy is sintered in the shape of a weight to obtain the weight 140 can be adopted. However, in the eccentric weight 120 according to the first embodiment, a tungsten alloy is used. A round bar with a simple shape is made by sintering, and the round bar is cut into short pieces to produce a weight of 140. By doing so, the amount of the additive (for example, copper) contained in the tandasten 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.

[0148] The eccentric weight 120 according to Embodiment 1 can be manufactured, for example, by the following method.

[0149] (1) First step

A sheet metal member 130a with martensitic stainless steel strength is prepared (Fig. 2 (a)). In this thin metal member 130a, a portion 135a that becomes the weight side protruding portion 135, a portion 133a that becomes the motor shaft side protruding portion 133, and notches 137a and 137b are already formed. In FIG. 2 (a), the lines indicated by reference numerals X1 to X6 are virtual lines that serve as a reference during processing.

[0150] Next, the portion from one end E1 of the thin metal member 130a to the symbol XI is rounded with a plastic cage so that the motor shaft holding portion 132 of the weight support body becomes the starting point of plastic deformation. Thus, a portion corresponding to the motor shaft holding portion 132 is formed (FIG. 2 (b)).

[0151] Next, in the thin metal member 130a, the part from the code X2 to the code X3, the part from the code X3 to X4, and the part from the code X4 force to the code X5 are also deformed, and further in the notches 137a and 137b The thin metal member 130a is deformed by plastic deformation so as to intersect, and a portion corresponding to the weight holding portion 134 is formed (FIGS. 2 (c) to 2 (e)).

[0152] Next, a portion of the thin metal member 130a extending from the symbol X6 to the other end E2 is rounded by plastic working so that the thin metal member is wound in a doubled state. A weight support precursor 130b having approximately the same shape as the weight support 130 is formed (FIG. 2 (f)). [0153] (2) Second step

A weight support 130 having a Vickers hardness (Hv) of 150 or more is manufactured by subjecting a weight support precursor 130b having substantially the same shape as the weight support 130 to hardening treatment by quenching calorie (FIG. 2). (g)).

[0154] (3) Third step

A tungsten alloy round bar having the same cross-sectional shape as that of the weight 140 is prepared. Next, the above-described round bar is cut into a predetermined length to manufacture the weight 140.

[0155] Next, the weight 140 is inserted into the weight holding part 134 in a state where the inner peripheral part is expanded. At this time, the weight 140 gradually pushes the weight side protruding portion 135 outward as the weight 140 is inserted into the weight holding portion 134. Thereafter, after the weight 140 is completely inserted into the weight holding portion 134, the state in which the inner peripheral portion is expanded is released. Then, the weight 140 is held in the weight holding portion 134 by the elastic force of the weight side protrusion 135 and the elastic force of the entire weight support 134.

As a result, the eccentric weight 120 in which the weight 140 is strongly held by the weight holding portion 134 by the elastic force is manufactured (FIG. 2 (h)).

FIG. 3 is a view for explaining the vibration motor 100 according to the first embodiment. 3 (a) is a perspective view of the vibration motor 100 according to the first embodiment, FIG. 3 (b) is a view of the vibration motor 100 according to the first embodiment as viewed from the front, and FIG. FIG. 3 is a view of a part of the vibration motor 100 according to the first embodiment as viewed from the side.

[0158] The vibration motor 100 according to the first embodiment is a vibration motor including a motor body 110 and an eccentric weight 120, as shown in FIG. 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, as described above. 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 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, so that a necessary vibration amount can be obtained with light weight and low power consumption, and high reliability for a long time. It becomes a vibration motor.

[0159] For this reason, the necessary amount of vibration can be obtained with such light weight and low power consumption, and long-time transmission is achieved. By using the highly reliable vibration motor 100 with high reliability as the vibration motor of a portable device, the portable device can be a highly reliable portable device that is lightweight, low power consumption and long-term reliability.

[Embodiments 2 to 3]

FIG. 4 is a view for explaining the eccentric weight 220 according to the second embodiment. Fig. 4 (a) is a view of the weight support 230 of the eccentric weight 220 as viewed from the front, Fig. 4 (b) is a view of the weight 240 of the eccentric weight 220 from the front, and Fig. 4 (c) It is the figure which looked at the eccentric weight 220 from the front.

[0161] The eccentric weight 220 according to the second embodiment is different from the eccentric weight 120 according to the first embodiment in the number and the cross-sectional shape of the weight (and accordingly, the cross-sectional shape of the weight support). That is, as shown in FIG. 4, the eccentric weight 220 according to the second embodiment includes one weight 240 having a substantially fan-shaped cross-sectional shape (and one weight 240 having a substantially fan-shaped cross-sectional shape accordingly). It has a weight support 230) having a cross-sectional shape to hold. The weight holding part 234 in the weight support body 230 has two weight side protrusions 235 and 235.

FIG. 5 is a view for explaining the eccentric weight 320 according to the third embodiment. Fig. 5 (a) is a view of the weight support 330 of the eccentric weight 320 as seen from the front, Fig. 5 (b) is a view of the weight 340 of the eccentric weight 320 from the front, and Fig. 5 (c) It is the figure which looked at the eccentric weight 320 from the front.

[0163] Similarly to the eccentric weight 220 according to the second embodiment, the eccentric weight 320 according to the third embodiment also has the same number of weights and cross-sectional shape (and the corresponding cross-sectional shape of the weight support body) as the first embodiment. This is different from the case of the eccentric weight 120. That is, as shown in FIG. 5, the eccentric weight 320 according to the third embodiment includes one weight 340 having a substantially fan-shaped cross-sectional shape (and one weight having a substantially fan-shaped cross-sectional shape accordingly). A weight support 330) having a cross-sectional shape to hold 340; However, unlike the case of the eccentric weight 220 according to the second embodiment, the weight holding part 334 in the weight support 330 has four weight side protruding parts 335, 335, 335, 335.

[0164] As described above, the eccentric weights 220 and 320 according to the second or third embodiment include the number of weights and the cross-sectional shape. Although the shape (and thus the cross-sectional shape of the weight support) is different from that of the eccentric weight 120 according to the first embodiment, the eccentric weight is divided into a weight made of a high specific gravity metal and a high specific weight metal constituting the weight. Since the eccentric weights 220 and 320 are manufactured by integrating the weight support made of a metal having a lower specific gravity, the total of the eccentric weights 220 and 320 is the same as the case of the eccentric weight 120 according to the first embodiment. The weight can be reduced and the amount of eccentricity of the eccentric weights 220 and 320 can be increased. Therefore, by using such eccentric weights 220 and 320, it is possible to configure a vibration motor that can obtain a large amount of vibration with light weight and low power consumption.

[0165] Further, according to the eccentric weights 220 and 320 according to the second or third embodiment, the weight support body is the weight support body 230 or 330 having an elastic force, so that it is the same as the case of the eccentric weight 120 according to the first embodiment. Further, the weights 240 and 340 are held by the weight holding portions 234 and 334 by the elastic force of the entire weight holding portions 234 and 334. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, the reliability of the connection between the weight 240, 340 and the weight support 230, 330 is suppressed, and such an eccentric weight 220, By using 320, a long-term reliable high V vibration motor can be constructed.

[0166] Also, according to the eccentric weights 220 and 320 according to the second or third embodiment, when the weight holding part is integrated with the weight and the weight support, the weight-side protrusion becomes smaller when the weight and the weight support are reduced. Since the weight holding portions 234 and 334 having the portions 2 35 and 335 are used, the weights 240 and 340 are added with the elastic force of the weight side protruding portions 235 and 335 as in the case of the eccentric weight 120 according to the first embodiment. The weight holding parts 234 and 334 are held by a strong elastic force. For this reason, when the vibration motor (and the eccentric weights 220 and 320) is used for a long time, it is possible to further suppress the deterioration of the reliability of the connection between the weights 240 and 340 and the weight support bodies 230 and 330. By using such eccentric weights 220 and 320, it is possible to configure a vibration motor with higher long-term reliability.

[Embodiments 4 to 5]

FIG. 6 is a view for explaining the eccentric weight 420 according to the fourth embodiment. Fig. 6 (a) is a view of the weight support 430 of the eccentric weight 420, and Fig. 6 (b) is a cross-sectional view taken along line 2-2A2 in Fig. 6 (a), and Fig. 6 (c) is a diagram. Fig. 6 (b) is an A3-A3 cross-sectional view, and Fig. 6 (d) is a diagram. FIG. 6 (b) is a cross-sectional view taken along line A4-A4, and FIG. 6 (e) is a view of the eccentric weight 420 as viewed from the front.

[0168] The eccentric weight 420 according to the fourth embodiment has a structure that is very similar to the eccentric weight 120 according to the first embodiment, but the structure of the weight side protrusion 435 is the same as that of the eccentric weight 120 according to the first embodiment. It is different from the case. That is, the weight side protruding portion 435 of the eccentric weight 420 according to the fourth embodiment has a rib force having a rectangular planar shape as shown in FIG. 6 (b). In the weight side protrusion 435, two opposite sides of the four sides of the rectangle are connected to the body of the weight holder 434, and the other two sides are separated from the weight holder 434! RU

FIG. 7 is a view for explaining an eccentric weight 520 according to the fifth embodiment. Fig. 7 (a) is a view of the weight support 530 of the eccentric weight 520, also showing the front force, Fig. 7 (b) is a cross-sectional view of Fig. 7 (a) VIII-A5, and Fig. 7 (c) FIG. 7D is a perspective view of the eccentric weight 520, and FIG. 7D is a perspective view of the eccentric weight 520. FIG.

[0170] Similarly to the eccentric weight 420 according to the fourth embodiment, the eccentric weight 520 according to the fifth embodiment has a structure similar to that of the eccentric weight 120 according to the first embodiment, but the weight side protruding. The structure of the part is different from that of the eccentric weight 120 according to the first embodiment. That is, the weight side protrusion 535 of the eccentric weight 520 according to the fifth embodiment also has a rib force with a rectangular planar shape as shown in FIG. 7 (b). In the weight side protruding portion 535, two opposite sides of the four sides of the rectangle are connected to the body of the weight holding portion 534, and the other two sides are separated from the weight holding portion 534. Speak.

[0171] As described above, the eccentric weights 420 and 520 according to the fourth or fifth embodiment are different from the case of the eccentric weight 120 according to the first embodiment in that the structure of the weight side protrusion is as shown in FIGS. Although different, eccentric weights 420, 520 manufactured by integrating a weight made of a high specific gravity metal with a weight support made of a metal having a specific gravity lower than that of the high specific gravity metal constituting the weight. Therefore, as in the case of the eccentric weight 120 according to the first embodiment, the total weight of the eccentric weights 420 and 520 can be reduced and the amount of eccentricity in the eccentric weights 420 and 520 can be increased. For this reason, by using such eccentric weights 420 and 520, it is possible to configure a vibration motor that is lightweight and can obtain a large amount of vibration with low power consumption.

[0172] Further, according to the eccentric weights 420 and 520 according to the fourth or fifth embodiment, the weight support body is the weight support body 430 or 530 having an elastic body force, so that the eccentric weight 120 according to the first embodiment and Similarly, the weights 440 and 540 are held by the weight holding portions 434 and 534 by the elastic force of the entire weight holding portions 434 and 534. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, the reliability of the connection between the weights 440, 540 and the weight support bodies 430, 530 is suppressed, and such an eccentric weight 420, By using 520, a long-term reliable high V vibration motor can be constructed.

[0173] Also, according to the eccentric weights 420 and 520 according to the embodiment 4 or 5, when the weight holding portion is integrated with the weight and the weight support body, the weight-side protrusion becomes smaller when the weight is protruded toward the weight side. Since the weight holding portions 434 and 534 having the portions 4 35 and 535 are used, the weights 440 and 540 are added with the elastic force of the weight side protruding portions 435 and 535 as in the case of the eccentric weight 120 according to the first embodiment. The weight holding parts 434 and 534 are held by a strong elastic force. For this reason, it is possible to further suppress the decrease in the reliability of the connection between the weights 440, 540 and the weight support bodies 430, 530 when the vibration motor (and the eccentric weight) is used for a long time. By using the eccentric weights 420 and 520, a vibration motor with higher long-term reliability can be configured.

[0174] In the eccentric weight 520 according to the fifth embodiment, the weight support 530 has both weights in the direction along the motor shaft as shown in FIGS. 7 (b) and 7 (d). It has a weight holding frame 536 for holding.

[0175] Therefore, according to the eccentric weight 520 according to the fifth embodiment, the weight support 530 can hold the weight 540 from both sides in the direction along the motor shaft. (And eccentric weight 520) can be further suppressed from lowering the reliability of the connection between the weight 540 and the weight support 530 when used for a long time, by using such an eccentric weight 520, A vibration motor with higher long-term reliability can be configured.

[Embodiment 6]

FIG. 8 is a view for explaining the eccentric weight 620 according to the sixth embodiment. 8A is a perspective view of the weight support 630 and the weight 640 of the eccentric weight 620, and FIG. 8B is a perspective view of the eccentric weight 620. FIG.

[0177] The eccentric weight 620 according to the sixth embodiment is similar in structure to the eccentric weight 120 according to the first embodiment. However, the shape of the weight 640 is different from that of the eccentric weight 120 according to the first embodiment. That is, in the eccentric weight 620 according to the sixth embodiment, the weight 640 has a recess 645 that receives the weight side protrusion 635 in the portion corresponding to the weight side protrusion 635 as shown in FIG. It has been.

[0178] Thus, the eccentric weight 620 according to the sixth embodiment is different from the eccentric weight 120 according to the first embodiment as shown in FIG. Weights made of heavy metals and lower specific gravity than the high specific gravity metals that make up weights! Since the eccentric weight 620 is manufactured by integrating the weight support made of the metal, the total weight of the eccentric weight 620 is reduced and the eccentric weight 620 is reduced as in the case of the eccentric weight 120 according to the first embodiment. The amount of eccentricity at the weight 620 can be increased. Therefore, by using such an eccentric weight 620, it is possible to configure a vibration motor that can obtain a large amount of vibration with light weight and low power consumption.

[0179] Also, according to the eccentric weight 620 according to the sixth embodiment, the weight support is the weight support 630 made of an elastic body, so that the weight 640 is the weight as in the case of the eccentric weight 120 according to the first embodiment. The weight holding part 634 is held by the elastic force of the holding part 634 as a whole. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to suppress a decrease in the reliability of the connection between the weight 640 and the weight support 630. By using such an eccentric weight 620, A vibration motor with high long-term reliability can be configured.

[0180] In addition, according to the eccentric weight 620 according to the sixth embodiment, the weight holding portion has the weight side protruding portion 635 that reduces the amount of protrusion to the weight side when the weight and the weight support are integrated. Since the weight holding portion 634 is used, the weight 640 is held by the weight holding portion 634 with a stronger elastic force to which the elastic force of the weight side protruding portion 635 is applied, as in the case of the eccentric weight 120 according to the first embodiment. Will be. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to further prevent the reliability of the connection between the weight 640 and the weight support body 630 from being lowered. By using it, a vibration motor with higher long-term reliability can be configured.

[0181] Furthermore, according to the eccentric weight 620 according to the sixth embodiment, the weight 640 is removed from the weight holding portion 634 by locking the recess 645 formed in the weight 640 and the weight side protruding portion 635. It is possible to suppress the separation. For this reason, since it is possible to further suppress the decrease in the reliability of the connection between the weight 640 and the weight support 630 when the vibration motor is used for a long time, by using such an eccentric weight 620, A vibration motor with higher long-term reliability can be constructed.

[Embodiment 7]

FIG. 9 is a perspective view of an eccentric weight 720 according to the seventh embodiment.

[0183] The eccentric weight 720 according to the seventh embodiment has a structure very similar to the eccentric weight 120 according to the first embodiment, but is implemented in that a weight support body provided with a predetermined opening is used. This is different from the case of the eccentric weight 120 according to Form 1. In the eccentric weight 720 according to the seventh embodiment, as shown in FIG. 9, the weight support 730 is manufactured using a thin metal member provided with a predetermined opening.

[0184] For this reason, according to the eccentric weight 720 according to the seventh embodiment, the amount of the material constituting the weight support 730 can be further reduced while maintaining the required strength. As a result, the total weight of the eccentric weight 720 can be further reduced, and the amount of eccentricity in the eccentric weight 720 can be further increased. Therefore, by using such an eccentric weight 720, it is possible to configure a vibration motor that can obtain a necessary vibration amount with lighter and less power consumption.

[Embodiment 8]

FIG. 10 is a view for explaining the eccentric weight 820 according to the eighth embodiment. FIG. 10 (a) is a view of the eccentric weight 820 viewed from the front, and FIG. 10 (b) is a view of the eccentric weight 820 coupled to the motor shaft 812 viewed from the front.

[0186] The eccentric weight 820 according to the eighth embodiment is different from the eccentric weight 120 according to the first embodiment, and does not have a weight side protrusion for holding the weight with a strong elastic force. Instead, the weight support 830 in the eighth embodiment has a structure that allows the weight holding portion 832 to hold the weight 840 with a stronger elastic force when the motor shaft 812 is inserted into the motor shaft holding portion 832. is doing.

That is, in the eccentric weight 820 according to the eighth embodiment, a slight gap is formed between the weight holding portion 834 and the weight 840 before the motor shaft 812 is inserted (FIG. 10 ( a ) Refer to the part of code C. ) After the motor shaft 812 is inserted, the motor shaft 812 pushes and spreads the motor shaft holding portion 832, whereby the motor shaft holding portion 832 and the weight holding portion 834 are elastically deformed, and the weight holding portion 834 and the weight 840 There is no gap formed between them (see Fig. 10 (b);). For this reason, the weight holding portion 832 holds the weight 840 with a stronger elastic force.

[0188] For this reason, according to the eccentric weight 820 according to the eighth embodiment, it is possible to further suppress a decrease in the reliability of joining between the weight 840 and the weight support 830 when the vibration motor is used for a long time. Therefore, by using such an eccentric weight 820, it is possible to configure a vibration motor with higher long-term reliability.

[0189] In the eccentric weight 820 according to the eighth embodiment, the weight support 830 is made of an elastic body manufactured by plastically deforming a thin metal member into a predetermined shape and then performing a hardening process.

Therefore, according to the eccentric weight 820 according to the eighth embodiment, the weight support body 830 can hold the weight and the motor shaft 812 more firmly by the elastic force, and the vibration motor ( Further, it is possible to sufficiently suppress the decrease in the reliability of the connection between the weight 840 and the weight support 830 when the eccentric weight is used for a long time. Therefore, by using such an eccentric weight 820, a vibration motor with high long-term reliability can be configured.

[0191] Also, according to the eccentric weight 820 according to the eighth embodiment, the amount of the material constituting the weight support 830 can be made extremely small while maintaining the required strength. As a result, 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 less power consumption.

[0192] In the eccentric weight 820 according to the eighth embodiment, the Vickers hardness (Hv) of the weight support 830 is 150 or more.

[0193] With this configuration, the weight support 830 can hold the weight 840 with a strong elastic force and can hold the motor shaft 812 with a strong elastic force. Speaking of this viewpoint, the Vickers hardness (Hv) of the weight support 830 is 200 or more. More preferably, the power is 250 or more.

[Embodiment 9]

FIG. 11 is a view for explaining the eccentric weight 920 according to the ninth embodiment. FIG. 11 (a) is a view of the weight support body 930 of the eccentric weight 920 viewed from the front, and FIG. 11 (b) is a view of the eccentric weight 920 viewed from the front. FIG. 11 (c) is a front view of the eccentric weight 920 coupled to the motor shaft 912. FIG.

[0195] As with the eccentric weight 820 according to the eighth embodiment, the eccentric weight 920 according to the ninth embodiment does not have a weight side protrusion for holding the weight with a stronger elastic force. However, unlike the case of the eccentric weight 820 according to the eighth embodiment, the weight support 930 in the ninth embodiment has a space defined by the motor shaft holding portion 932 when the weight 940 is inserted into the weight holding portion 934. The structure is small.

[0196] In the eccentric weight 920 according to Embodiment 9, the area of the space defined by the motor shaft holding portion 932 is approximately the same as the cross-sectional area of the motor shaft 912 before the weight 940 is inserted. (Refer to Fig. 11 (a).) After the weight 940 is inserted, the weight 940 spreads the weight holding portion 934, whereby the motor shaft holding portion 932 is elastically deformed and the motor shaft holding portion 932 is defined. The space to perform becomes smaller (see Fig. 11 (b);). For this reason, when the motor shaft 912 is inserted into the motor shaft holding portion 932, the motor shaft holding portion 932 holds the motor shaft 912 with a stronger elastic force (see FIG. 11 (c);). Further, in this case, when the motor shaft 912 is inserted into the motor shaft holding portion 932, the weight holding portion 934 is elastically deformed and tends to be further reduced, so that the weight holding portion 934 applies the weight 940 with a stronger elastic force. Hold it.

Therefore, according to the eccentric weight 920 according to the ninth embodiment, when the vibration motor is used for a long time, the reliability of the connection between the weight 940 and the weight support 930 is reduced, or the motor shaft 912 Since it can further suppress that the reliability of joining with the weight support body 930 falls, a vibration motor with higher long-term reliability can be comprised.

[0198] In the eccentric weight 920 according to the ninth embodiment, the weight support 930 is made of an elastic body that is manufactured by plastically deforming a thin metal member into a predetermined shape and then performing a hardening process. [0199] Further, in the eccentric weight 920 according to the ninth embodiment, the weight support 930 manufactured by performing a hardening process after plastically deforming a thin metal member into a predetermined shape is used. The body 930 can hold the weight 940 and the motor shaft 912 more firmly by elastic force, and when the vibration motor (and eccentric weight) is used for a long time, the weight 940 and the weight support 930 It is possible to sufficiently suppress the decrease in bonding reliability. Therefore, by using such an eccentric weight 920, a long-term reliable high-V vibration motor can be configured.

[0200] For this reason, according to the eccentric weight 920 according to the ninth embodiment, the amount of the material constituting the weight support 930 can be made extremely small while maintaining the required strength. Thereby, 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.

[0201] In the eccentric weight 920 according to Embodiment 9, the Vickers hardness (Hv) of the weight support 930 is 150 or more.

With this configuration, the weight support 930 can hold the weight 940 with a strong elastic force and can hold the motor shaft 912 with a strong elastic force. Speaking also from this viewpoint, the Vickers hardness (Hv) of the weight support 930 is 200 or more, more preferably 250 or more.

[Embodiment 10]

FIG. 12 is a view for explaining the eccentric weight 1020 according to the tenth embodiment. Fig. 1 2 (a) is a view of the weight support 1030 of the eccentric weight 1020 as seen from the frontal force, and Fig. 12 (b) is a view of the weight support 1030 of the eccentric weight 1020 as seen from the side force. c) is a view of the weight support 1030 of the eccentric weight 1020 as seen from the bottom, and Fig. 12 (d) is a cross-sectional view of Fig. 12 (&) 8-6-8, and Fig. 12 (e) FIG. 12 is a perspective view of a weight support 1030 in an eccentric weight 1020, and FIG. 12 (f) is a perspective view of an eccentric weight 1020.

FIG. 13 is a view for explaining the method of manufacturing the eccentric weight 1020 according to the tenth embodiment. FIG. 13 (a) to FIG. 13 (i) are diagrams showing each step. FIG. 14 is a view for explaining the vibration motor 1000 according to the tenth embodiment. FIG. 14 (a) is a perspective view of the vibration motor 1000 according to the tenth embodiment, FIG. 14 (b) is a view of the vibration motor 1000 according to the tenth embodiment as viewed from the front, and FIG. FIG. 10 is a view of a part of a vibration motor 1000 according to a tenth embodiment as viewed from the side.

[0205] As with the eccentric weight 820 according to the eighth embodiment, the eccentric weight 1020 according to the tenth embodiment has the weight holding section 1034 when the motor shaft 1012 (see FIG. 14) is inserted into the motor shaft holding section 1032. Furthermore, it has a structure that holds the weight 1040 with a strong elastic force.

That is, in the eccentric weight 1020 according to the tenth embodiment, when the motor shaft 1012 is inserted, the motor shaft 1012 pushes the motor shaft holding portion 1032 apart, so that the weight holding portion 1034 has a stronger elastic force. The weight 1040 will be held.

Therefore, according to the eccentric weight 1020 according to the tenth embodiment, the weight 1040 and the weight support when the vibration motor 1000 is used for a long time as in the case of the eccentric weight 820 according to the eighth embodiment. Since it can further suppress that the reliability of joining with 1030 falls, by using such an eccentric weight, a vibration motor with higher long-term reliability can be constituted.

In the eccentric weight 1020 according to the tenth embodiment, as shown in FIGS. 12 to 14, the weight support 1030 has a weight holding frame 1036 that holds the weight 1040 on one side in the direction along the motor shaft 1012. have. By inserting the weight 1040 into the weight holding part 1034 from the other side of the weight support 1030 (the side where the weight holding frame 1036 in FIG. 12 (e) is not formed), the weight 1040 is made elastic by the weight holding part 1034. The force and weight holding frame 1036 holds the weight holding portion 1034.

Therefore, according to the eccentric weight 1020 according to the tenth embodiment, the weight support 1030 can hold the weight 1040 even in one side force in the direction along the motor shaft 1012 as shown in FIG. This makes it possible to further suppress the decrease in the reliability of the connection between the weight 1040 and the weight support 1030 when the vibration motor (and the eccentric weight 1020) is used for a long time. By using an eccentric weight 1020, a vibration motor can be constructed with higher long-term reliability.

[0210] The eccentric weight 1020 according to Embodiment 10 is related to Embodiment 1 as shown in FIG. As in the case of the eccentric weight 120, the sheet metal member 1030a can be manufactured by plastically deforming it into a predetermined shape and then performing a hardening process.

[Embodiment 11]

FIG. 15 is a view for explaining the eccentric weight 1120 according to the eleventh embodiment. Fig. 15 (a) is a view of the weight support 1130 of the eccentric weight 1120 as viewed from the front, and Fig. 15 (b) is a view of the weight support 1130 of the eccentric weight 1120 also showing the side force. FIG. 15C is a perspective view of the eccentric weight 1120, and FIG. 15D is a view of a part of the vibration motor 1100 according to the eleventh embodiment as viewed from the side.

FIG. 16 is a schematic view for explaining the method for manufacturing the eccentric weight according to the eleventh embodiment. Fig. 16 (a), Fig. 16 (b), Fig. 16 (d) and Fig. 16 (f) are front views of the eccentric weight 1 120 in each manufacturing process, and Fig. 16 (c), Fig. 16 (e) and Fig. 16 FIG. 16 (g) is an AA cross-sectional view of the eccentric weight 1120 in each manufacturing process.

[0213] The eccentric weight 1120 according to the eleventh embodiment has a structure similar to the eccentric weight 120 according to the first embodiment, but the length of the weight holding portion 1130 along the longitudinal direction of the weight 1140 is actual. This is different from the case of the eccentric weight 120 according to the first embodiment. That is, in the eccentric weight 1120 according to the eleventh embodiment, as shown in FIGS. 15 (c) and 15 (d), the length of the weight holding portion 1130 along the longitudinal direction of the weight 1140 is set. Compared to the case of the eccentric weight 120 according to the first embodiment, the length is about 50%.

[0214] Thus, in the eccentric weight 1120 according to the eleventh embodiment, the length of the weight holding portion along the longitudinal direction of the weight is different from that of the eccentric weight 120 according to the first embodiment. In this respect, since the configuration is the same as that of the eccentric weight 120 according to the first embodiment, the effect of the eccentric weight 120 according to the first embodiment is obtained as it is.

[0215] Further, according to the eccentric weight 1120 according to the eleventh embodiment, the length of the weight holding portion 1130 along the longitudinal direction of the weight 1140 is approximately 50% of the length of the eccentric weight 120 according to the first embodiment. Therefore, the total weight of the eccentric weight 1120 can be further reduced and the amount of eccentricity in the eccentric weight 1120 can be further increased. Therefore, according to the eccentric weight 1120 according to the eleventh embodiment, it is possible to configure a vibration motor that can obtain a necessary vibration amount with light weight and low power consumption. As shown in FIG. 15 (d), the vibration motor 1100 according to the eleventh embodiment includes a weight holding portion 1134 in which the weight holding portion 1134 along the longitudinal direction of the weight 1140 is shorter than the weight 1140. An eccentric weight 1120 that holds the weight 1140 at an eccentric position along the longitudinal direction of the weight 1140 is provided. The eccentric weight 1120 is fixed to the motor main body 1110 in a direction in which the distance between the motor shaft holding portion 1132 and the motor main body 1110 approaches.

Therefore, according to the vibration motor 1100 according to the eleventh embodiment, the distance between the motor shaft holding portion 1132 of the eccentric weight 1120 and the bearing 1114 of the motor main body 1110 is reduced, so that the motor shaft 1112 is rotated. It is possible to suppress the deflection of the motor shaft 1112. As a result, the eccentric weight 1120 rotates more stably, and the eccentric vibration characteristics of the vibration motor 1100 are improved.

[0218] The manufacturing method of the eccentric weight according to Embodiment 11 is the same as the manufacturing method of the eccentric weight 120 according to Embodiment 1 described above, and the first step has the following contents, and the fourth process shown below. In addition.

[0219] Step 1

The thin metal member is plastically deformed so that the inner peripheral part of the weight support part 134 is larger than the outer peripheral part of the weight 140.

[0220] Fourth step

First, the weight 1140 is inserted into the weight support 1130 (FIGS. 16 (a), 16 (b) and 16 (c).

)reference. ).

Next, with the weight 1140 inserted into the weight support 1130, both side forces in the direction along the motor shaft also press the weight 1140 (see FIG. 16 (d) and FIG. 16 (e);). At this time, the weight 1140 is plastically deformed so that the dimension increases in a direction perpendicular to the pressing direction. As a result, the weight 1140 and the weight holding portion 1134 are fixed (see FIG. 16 (f) and FIG. 16 (g)).

Before and after the 4th process, comparing the dimensions of the weight 1140 in the A-A cross section, the dimension of the weight 1140 before the 4th process is L1 (see Fig. 16 (c)) and the weight 1140 after the 4th process is When the dimension is L2 (see Fig. 16 (g)), L1 and L2 have the relationship of LKL2.

[0221] According to the manufacturing method of the eccentric weight 1120 according to the eleventh embodiment, in the weight support portion 1134, Since the sheet metal member is plastically deformed so that the size of the inner peripheral portion is larger than the size of the outer peripheral portion of the weight 1140, it is easy to insert the weight 1140 into the weight support 1130 in the third step. Productivity when manufacturing the eccentric weight 1120 can be improved.

[0222] Also, according to the manufacturing method of the eccentric weight 1120 according to the eleventh embodiment, the weight 1140 and the weight holding portion 1134 are fixed by pressing the weight 1140 and plastically deforming, so the weight 1140 holds the weight. Part 1134 is firmly held. 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 1140 and the weight support 1130.

[0223] Although the eccentric weight, vibration motor, and portable device of the present invention have been described based on the above embodiments, the present invention is not limited to the above embodiments and does not depart from the gist thereof. The present invention can be implemented in various modes within the scope, and for example, the following modifications are possible.

(1) In the eccentric weights 120 to 1120 of the above embodiments, the force using tungsten alloy as the weight is not limited to this. For example, tungsten, osmium, osmium alloy, gold, gold alloy, iridium, iridium alloy, and other metals having higher specific gravity than the weight support can be used. In addition to the above metal, a metal having a specific gravity higher than that of the metal constituting the weight support, such as silver, copper, brass, lead, molybdenum or nickel, can also be used.

(2) In the eccentric weights 120 to 1120 of each of the above embodiments, the force using martensitic stainless steel as the thin metal member is not limited to this. For example, a metal having quenching hardenability other than martensitic stainless steel can be used. Moreover, the metal which has age-hardening property can also be used. In this case, precipitation hardening stainless steel, beryllium copper alloy, nickel manganese copper alloy, precipitation hardening titanium alloy or aluminum alloy can also be used as the age-hardening metal. In addition, work-hardening metals, shape memory alloys and other metals can be used.

[0226] (3) In the eccentric weights 120 to 2020 of each of the above embodiments, the weight is a round bar. Although a cut body or a round bar cut out from the sintered body and machined into the same cross-sectional shape as the weight is used, 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 having the same cross-sectional shape as a weight (for example, a circle, an ellipse, a fan shape, etc.) is shortened. A cut one can be used.

(4) Although the eccentric weights 720 to 920 of the embodiments 7 to 9 do not have the motor shaft side protruding portion and the weight side protruding portion, these eccentric weights 720 to 920 also implement the above described The motor shaft side protruding portion 133 and the weight side protruding portion 135 as in the eccentric weight 120 of the first embodiment may be provided.

[0228] (5) In the eccentric weights 120 to 1120 of each of the above embodiments, the weights 140 to 1140 are held by the elastic force of the weight holding parts 134 to 1134, but the present invention is limited to this. It ’s not something. It is also preferable to apply an adhesive to the joint surface between the weight and the weight holding part to adhere the weight and the weight holding part. As a result, in addition to the elastic force of the weight holding part, the weight and the weight holding part are joined by the adhesive force of the adhesive, so that the weight support body can hold the weight more firmly and vibrate. When the motor (and the eccentric weight) is used for a long time, it is possible to further sufficiently suppress the decrease in the reliability of the connection between the weight and the weight support. Therefore, by using such an eccentric weight, a vibration motor with high long-term reliability can be obtained.

[0229] (6) In the eccentric weights 120 to 1120 of each of the above embodiments, the motor shaft is held by the elastic force of the motor shaft holding portions 132 to 1132, but the present invention is not limited to this. Well then! It is also preferable to apply an adhesive to the joint surface between the motor shaft holding portion and the motor shaft to bond the motor shaft holding portion and the motor shaft. As a result, in addition to the elastic force of the motor shaft holding portion, the motor shaft holding portion and the motor shaft are joined by the adhesive force of the adhesive, so that the weight support body can hold the motor shaft more firmly. Thus, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to further sufficiently suppress the reduction in the reliability of the connection between the motor shaft and the weight support. For this reason, a vibration motor with high long-term reliability can be obtained by using such an eccentric weight.

(7) In the eccentric weight 620 according to the sixth embodiment, the weight 640 includes the weight side protrusion 635. A recess 645 for receiving the weight side protrusion 635 is formed in the corresponding part, but the present invention is not limited to this. It is also preferable to apply an adhesive to the joint surface between the weight and the weight holding part to bond the weight and the weight holding part using a weight having a groove formed on the joint surface between the weight and the weight holding part in the weight. . As a result, an adhesive pool in which the adhesive accumulates in a groove formed in the weight is formed, and the weight support and weight are firmly bonded.In addition to the elastic force of the weight holding part, the adhesive strength of the adhesive As a result, the weight holding portion and the weight are firmly bonded to each other. For this reason, when the vibration motor (and the eccentric weight) is used for a long time, it is possible to further sufficiently suppress the decrease in the reliability of the connection between the motor shaft and the weight support, and such an eccentric weight is used. As a result, a vibration motor with high long-term reliability can be obtained.

(8) The vibration motor of the present invention can be suitably used for portable devices such as mobile phones and PDAs, and can also be suitably used for game machine remote controls, pachinko operating units, electric toothbrushes, and the like. .

Claims

The scope of the claims

[1] High specific gravity metal weight,

A weight support made of an elastic body having a weight holding portion for holding the weight and a motor shaft holding portion for holding the motor shaft, and having a specific gravity lower than that of the high specific gravity metal constituting the weight; Is an eccentric weight manufactured by integrating

The eccentric weight is characterized in that the weight holding portion has a weight side protruding portion that reduces a protruding amount force S toward the weight side when the weight and the weight support are integrated.

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

The eccentric weight is characterized in that the weight support is made of an elastic body manufactured by plastically deforming a thin metal member into a predetermined shape and then performing a hardening process.

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

An eccentric weight, wherein the weight support has a Vickers hardness (Hv) of 150 or more.

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

The eccentric weight is characterized in that the weight support is manufactured by plastic deformation starting from the motor shaft holding portion as V.

[5] In the eccentric weight according to any one of claims 2 to 4, the eccentric weight!

The eccentric weight is characterized in that the motor shaft holding portion has a structure in which the thin metal member is wound at least twice.

[6] In the eccentric weight according to any one of claims 1 to 5,

The eccentric weight is characterized in that the weight side protruding portion has a shape that becomes narrower in width toward the tip of the weight side protruding portion.

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

The eccentric weight, wherein the motor shaft holding portion has a motor shaft side protruding portion that reduces the amount of protrusion to the motor shaft side when the motor shaft is inserted into the motor shaft holding portion.

[8] In the eccentric weight according to claim 7,

The motor shaft side protrusion is narrower toward the tip of the motor shaft side protrusion. An eccentric weight characterized by having a shape.

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

The eccentric weight is characterized in that the weight has a recess for receiving the weight side protrusion at a portion corresponding to the weight side protrusion.

A high specific gravity metal power weight,

It has a weight holding part for holding the weight and a motor shaft holding part for holding the motor shaft, and has a specific gravity lower than that of the high specific gravity metal constituting the weight. An eccentric weight manufactured by integrating a weight support made of an elastic body manufactured by applying a curing treatment after

The eccentric weight is characterized in that the weight support has a structure in which the weight holding part holds the weight with a stronger elastic force when the motor shaft is inserted into the motor shaft holding part.

A high specific gravity metal power weight,

The eccentric weight according to claim 10 or 11, wherein the weight support has a structure such that a space defined by the motor shaft holding portion is reduced when the weight and the weight support are integrated. To the eccentric weights listed,

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

The eccentric weight is characterized in that the weight holding portion holds the weight over the entire outer peripheral portion of the weight.

In the eccentric weight according to claim 2, 3, 4, 5, 10, 11 or 12,

The weight support is a notch provided between the weight holding portion and the motor shaft holding portion. The eccentric weight is characterized in that the thin metal member intersects at the groove portion.

[15] The eccentric weight according to any one of claims 1 to 14,

The eccentric weight is characterized in that the weight support body has a weight holding frame for holding the weight from one side or both sides in a direction along the motor shaft.

[16] In the eccentric weight according to claims 1 to 15,

An eccentric weight having a weight whose cross section in a plane perpendicular to the direction along the motor shaft is circular as the weight.

[17] In the eccentric weight according to any one of claims 1 to 16,

An eccentric weight, wherein the thin metal member is provided with one or more holes for reducing the weight of the weight support.

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

An eccentric weight, wherein the thickness of the thin metal member is in the range of 0.05 mm to 0.5 mm.

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

The length of the weight holding part along the longitudinal direction of the weight is shorter than the weight. The weight holding part holds the weight at an eccentric position along the longitudinal direction of the weight. Eccentric weight.

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

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

[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] A vibration motor comprising a motor body and the eccentric weight according to any one of claims 1 to 21.

[23] The vibration motor according to claim 22,

As the eccentric weight, the length of the weight holding portion along the longitudinal direction of the weight is the front. The weight holding portion shorter than the weight includes an eccentric weight that holds the weight in an eccentric position along the longitudinal direction of the weight,

The eccentric weight is fixed to the motor main body in a direction in which the distance between the motor shaft holding portion and the motor body approaches.

[24] A portable device comprising the vibration motor according to claim 22 or 23.

[25] An eccentric weight manufacturing method for manufacturing the eccentric weight according to claim 1, wherein the weight is obtained by plastically deforming a thin metal member subjected to processing corresponding to the weight side protruding portion. A first step of producing a weight support precursor having substantially the same shape as the support;

A second step of producing the weight support by subjecting the weight support precursor to a curing treatment;

And a third step of integrating the weight and the weight holding portion in the weight support. The method for producing an eccentric weight, comprising:

[26] The method for producing an eccentric weight according to claim 25,

The method for producing an eccentric weight, wherein the second step uses the weight support having a Vickers hardness (Hv) of 150 or more by subjecting the weight support precursor to a curing treatment.

[27] The method for producing an eccentric weight according to claim 25 or 26,

In the first step, the sheet metal member is plastically deformed so that the size of the inner peripheral portion of the weight support portion is larger than the size of the outer peripheral portion of the weight,

The eccentric weight is manufactured by pressing the weight from both sides in the direction along the motor shaft and plastically deforming the weight with the weight inserted into the weight support. A method for producing an eccentric weight, further comprising a fourth step including a step of fixing the weight holding portion to the weight holding portion.