JP2013115835A - Vibration motor - Google Patents

Vibration motor Download PDF

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JP2013115835A
JP2013115835A JP2011256762A JP2011256762A JP2013115835A JP 2013115835 A JP2013115835 A JP 2013115835A JP 2011256762 A JP2011256762 A JP 2011256762A JP 2011256762 A JP2011256762 A JP 2011256762A JP 2013115835 A JP2013115835 A JP 2013115835A
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weight
shaft
fixed
cover
vibration motor
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JP5923794B2 (en
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Masahito Nakamura
将人 中村
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NIHON DENSAN SEIMITSU KK
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NIHON DENSAN SEIMITSU KK
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  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a vibration motor that greatly improves holding strength of a weight cover minimizing force operating on a rotary shaft wherever an eccentric weight is when a shock due to a fall of the motor or the like is applied thereto, so as to prevent the weight cover from falling, and to provide an assembly structure of the eccentric weight and weight cover.SOLUTION: An eccentric weight 20 and a weight cover 30 are fixed to a shaft 4. The eccentric weight 20 comprises a fixed part 21 fixed to the shaft 4 and a weight part 22 united with the fixed part 21, and the weight cover 30 comprises a coupling part 32 and a sandwiching parts 31 which are positioned on the opposite sides of the weight part 22 across the shaft 4 and sandwich the eccentric weight 20 therebetween, and a projection part 33 serving as a stopper for a shock applied to the vibration motor. The distance from the center of the shaft 4 to an outermost periphery of the weight part 22 is substantially equal to the distance from the center of the shaft 4 to an outermost periphery of the projection part 33.

Description

本発明は、携帯電話の着信報知等に使用される振動モータに関し、特に振動モータと偏心錘及び錘カバーとの組付け構造に関する。   The present invention relates to a vibration motor used for notification of incoming calls of a mobile phone, and more particularly to an assembly structure of a vibration motor, an eccentric weight, and a weight cover.

振動モータでは、モータ本体より突出した回転シャフトに偏心錘を取り付けることで、モータの回転により回転シャフトと共に偏心錘が回転し振動を得るものであるが、従来の振動モータでは、モータを誤って落下させた際に、偏心錘の位置によっては例えば特開平７−３３６９４１の図２１のように回転シャフトに強い力が働き、回転シャフトが曲がってしまうという不具合があった。   In a vibration motor, an eccentric weight is attached to a rotating shaft protruding from the motor body, and the eccentric weight rotates together with the rotating shaft by the rotation of the motor to obtain vibration. However, in a conventional vibration motor, the motor is accidentally dropped. When doing so, depending on the position of the eccentric weight, for example, as shown in FIG. 21 of Japanese Patent Laid-Open No. 7-336941, there is a problem that a strong force acts on the rotating shaft and the rotating shaft is bent.

そこで、特開平７−３３６９４１のように偏心錘に円板状の曲がり防止体を設け、モータ落下等により衝撃がかかった場合、偏心錘の位置が何処にあっても、曲がり防止体が速やかに外部と接触し、回転シャフトに働く力を最小限に抑えることを可能とした。   Therefore, as in JP-A-7-336941, a disc-shaped bending prevention body is provided on the eccentric weight, and when an impact is applied due to a motor drop or the like, the bending prevention body can be quickly moved regardless of the position of the eccentric weight. It is possible to minimize the force acting on the rotating shaft in contact with the outside.

特開平７−３３６９４１JP-A-7-336941

しかしながら、円板状の曲がり防止体の構造ではその固定強度に不安があり、モータに強い衝撃が加わった際に曲がり防止体が衝撃に耐えられず、曲がり防止体自体が偏心錘から脱落してしまうという不具合があった。   However, the structure of the disk-shaped anti-bending body has anxiety about its fixing strength. When a strong impact is applied to the motor, the anti-bending body cannot withstand the impact, and the anti-bending body itself falls off the eccentric weight. There was a bug that it would end up.

曲がり防止体を回転シャフトに固定しても同様の不具合の不安があり、固定強度を強化する為曲がり防止体の厚さを増し、回転シャフトとの固定強度を上げた場合には、今度は振動モータの大型化や、相対的に偏心錘が薄くなり振動量が低下するといった不具合がある。   Even if the anti-bending body is fixed to the rotating shaft, there is anxiety about the same problem, and if the thickness of the anti-bending body is increased to increase the fixing strength and the fixing strength with the rotating shaft is increased, this time vibration will occur. There are problems such as an increase in the size of the motor and a decrease in the vibration amount due to the relatively thin eccentric weight.

さらに、偏心錘から曲がり防止体を一体成形する構成も考えられているが、この場合、曲がり防止体の脱落の不具合は無くなるものの、偏心錘と同じ材料で形成される曲がり防止体が偏心錘のシャフトを挟んだ反対側に位置することになるため、偏心錘の振動量を相殺してしまうという不具合があった。   Furthermore, a configuration in which the anti-bending body is integrally formed from the eccentric weight is also considered, but in this case, the bending prevention body formed of the same material as the eccentric weight is eliminated, although the problem of falling off of the anti-bending body is eliminated. Since it is located on the opposite side across the shaft, there is a problem that the amount of vibration of the eccentric weight is offset.

上記課題を解決する為、本発明に係る振動モータと偏心錘及び錘カバーとの組付け構造は、一方より回転自在のシャフトが突出し、他方には端蓋が固定されたモータ本体と、シャフトに固定される偏心錘及び偏心錘よりも比重の軽い材料で成形された錘カバーからなる振動モータにおいて、偏心錘は、シャフトに固定される固定部及び固定部と一体となっている錘部からなり、錘カバーはシャフトを挟んで錘部の反対側に位置し且つ偏心錘を挟み込んで固定されており、シャフトの中心から錘部及び錘カバー各々の最外周までの距離が実質的に等しいことを特徴とする。   In order to solve the above-mentioned problem, the assembly structure of the vibration motor, the eccentric weight and the weight cover according to the present invention has a rotatable shaft projecting from one side and a motor body with an end lid fixed on the other side, and a shaft. In a vibration motor comprising a fixed eccentric weight and a weight cover formed of a material having a specific gravity lighter than the eccentric weight, the eccentric weight is composed of a fixed portion fixed to the shaft and a weight portion integrated with the fixed portion. The weight cover is located on the opposite side of the weight portion with the shaft in between and is fixed with the eccentric weight in between, and the distance from the center of the shaft to the outermost periphery of each of the weight portion and the weight cover is substantially equal. Features.

このような振動モータと偏心錘及び錘カバーとの組付け構造では、錘カバーが偏心錘を挟み込んで固定されている為、錘カバーの保持強度が格段に向上し、錘カバーの脱落を防止できる。また、錘カバーは偏心錘より比重の軽い別部材で成形されているため、振動量に与える影響も少なくて済む。錘カバーの偏心錘への固定方法は任意で良く、例えば、偏心錘に突起を成形し、錘カバーの突起に対応する位置に穴、若しくは凹部を成形して嵌め込むような構造でも良い。   In such an assembly structure of the vibration motor, the eccentric weight and the weight cover, the weight cover is fixed with the eccentric weight interposed therebetween, so that the holding strength of the weight cover is greatly improved and the weight cover can be prevented from falling off. . Further, since the weight cover is formed of another member having a specific gravity lighter than that of the eccentric weight, the influence on the vibration amount can be reduced. The method of fixing the weight cover to the eccentric weight may be arbitrary. For example, a structure in which a protrusion is formed on the eccentric weight and a hole or a recess is formed and fitted at a position corresponding to the protrusion of the weight cover may be employed.

錘カバーの偏心錘への固定方法において、錘カバーが偏心錘の両側を挟み込み、当該両側において各々シャフトに固定される構造を採用しても良い。この場合、錘カバーがシャフトの２箇所で固定され、また、偏心錘を挟み込んで偏心錘と一緒に固定される為、脱落強度が一層向上し、もはや錘カバー自体が破損しない限り脱落することは無くなる。また、シャフト固定部分の厚みは最小限で良い為、振動モータの大型化や、相対的に偏心錘が薄くなり振動量が低下するといった不具合は無くなる。   In the method of fixing the weight cover to the eccentric weight, a structure in which the weight cover sandwiches both sides of the eccentric weight and is fixed to the shaft on both sides may be employed. In this case, the weight cover is fixed at two locations on the shaft, and since the eccentric weight is sandwiched and fixed together with the eccentric weight, the dropout strength is further improved, and the weight cover will not fall off unless the weight cover itself is damaged. Disappear. In addition, since the thickness of the shaft fixing portion can be minimized, there are no problems such as an increase in the size of the vibration motor and a relatively thin eccentric weight and a decrease in the vibration amount.

偏心錘はシャフトに固定される固定部を加締めることでシャフトに固定されるが、錘カバーに固定部を露出させる開口部を成形する構造を採用すると、錘カバーを偏心錘及びシャフトに設置してからでも、偏心錘の加締め固定を容易に行なうことが出来る為、取付け作業が容易になると共に、開口部の分だけ錘カバーの重量が減少する為、振動モータの振動量が向上する。この構造は特に、錘カバーが偏心錘の両側を挟み込み、当該両側において各々シャフトに固定される構造に対して有効である。   The eccentric weight is fixed to the shaft by caulking the fixed part fixed to the shaft, but if a structure is formed in the weight cover that exposes the fixed part, the weight cover is installed on the eccentric weight and the shaft. Since the eccentric weight can be easily fixed by caulking, the mounting operation is facilitated, and the weight of the weight cover is reduced by the opening, so that the vibration amount of the vibration motor is improved. This structure is particularly effective for a structure in which the weight cover sandwiches both sides of the eccentric weight and is fixed to the shaft on both sides.

また、錘カバーは、モータに強い力がかかった場合に、どこか一部分でも外部と接触すればシャフトに働く力を最小限に抑えることが可能になることから、錘カバーはシャフトの中心から錘部の最外周までの距離と実質的に等しい距離だけ突出した突出部をシャフトの長さ方向の一部にのみ持つ構造であれば良い。この場合、錘カバーの重量を最小限に抑えることが可能になる為、振動モータの振動量が向上する。なお、突出部はモータ本体付近に成形しても構わないが、モータ本体と反対側の偏心錘の先端部分に設けたほうがより速やかに突出部が外部と接触し、シャフトに働く力を最小限に抑えることが可能になる。   In addition, when a strong force is applied to the motor, the weight cover can minimize the force acting on the shaft if it contacts any part of the outside. Any structure that has a protruding portion that protrudes by a distance substantially equal to the distance to the outermost periphery of the portion only in a part in the length direction of the shaft may be used. In this case, since the weight of the weight cover can be minimized, the vibration amount of the vibration motor is improved. The protrusion may be molded near the motor body, but the protrusion will contact the outside more quickly and minimize the force acting on the shaft if it is provided at the tip of the eccentric weight on the opposite side of the motor body. It becomes possible to suppress to.

本発明の振動モータと偏心錘及び錘カバーとの組付け構造では、振動モータに衝撃が加わった際のシャフトの曲がりを防止する錘カバーの保持強度が格段に向上し、脱落を防止できると共に、比重の軽い別部材で成形されているため、振動量に与える影響も少なくて済む。   In the assembly structure of the vibration motor of the present invention and the eccentric weight and the weight cover, the holding strength of the weight cover for preventing the bending of the shaft when an impact is applied to the vibration motor is remarkably improved, and the falling off can be prevented. Since it is formed of a separate member having a low specific gravity, the influence on the vibration amount can be reduced.

また、錘カバーに開口部を成形することで、錘カバーを偏心錘及びシャフトに設置してからでも、偏心錘の加締め固定を容易に行なうことが出来ると共に、開口部の分だけ錘カバーの重量が減少する為、振動モータの振動量が向上する。   In addition, by forming the opening in the weight cover, the eccentric weight can be easily caulked and fixed even after the weight cover is installed on the eccentric weight and the shaft. Since the weight is reduced, the vibration amount of the vibration motor is improved.

さらに、錘カバーに突出部を成形する構造では、錘カバーの重量を最小限に抑えることが可能になり、振動モータの振動量がさらに向上する。   Further, in the structure in which the protrusion is formed on the weight cover, the weight of the weight cover can be minimized, and the vibration amount of the vibration motor is further improved.

（Ａ）は本発明の実施例１に係る振動モータの斜視図で、（Ｂ）は同振動モータの縦断面図である。(A) is a perspective view of the vibration motor according to Embodiment 1 of the present invention, and (B) is a longitudinal sectional view of the vibration motor. 同振動モータの組立斜視図である。It is an assembly perspective view of the vibration motor. 本発明の他の実施例２に係る振動モータの斜視図である。It is a perspective view of the vibration motor which concerns on other Example 2 of this invention. 本発明の他の実施例３に係る振動モータの斜視図である。It is a perspective view of the vibration motor which concerns on other Example 3 of this invention.

次に、本発明の実施形態を添付図面に基いて説明する。   Next, embodiments of the present invention will be described with reference to the accompanying drawings.

図１（Ａ）は本発明の実施例１に係る振動モータの斜視図、（Ｂ）は同振動モータの縦断面図、図２は同振動モータの組立斜視図である。   1A is a perspective view of a vibration motor according to a first embodiment of the present invention, FIG. 1B is a longitudinal sectional view of the vibration motor, and FIG. 2 is an assembly perspective view of the vibration motor.

本発明の振動モータは、モータ本体１０のモータケース１の一方から、軸受２、３により回転自在に保持されたシャフト４が突出しており、モータケース１の他方はモータケース１の開口部を塞ぐように端蓋５が固定されている。６はモータ本体１０を携帯電話の基板等に設置する為の保持枠、７はモータ本体１０に外部電力を供給する為の端子部である。   In the vibration motor of the present invention, a shaft 4 rotatably supported by bearings 2 and 3 protrudes from one motor case 1 of a motor body 10, and the other motor case 1 closes an opening of the motor case 1. Thus, the end lid 5 is fixed. Reference numeral 6 denotes a holding frame for installing the motor body 10 on a substrate of a mobile phone, and 7 denotes a terminal portion for supplying external power to the motor body 10.

シャフト４には偏心錘２０及び錘カバー３０が固定されており、偏心錘２０は例えば密度が０．０１７５ｇ／ｍｍ３のタングステン材料等で成形されており、シャフト４に固定される固定部２１と、固定部２１と一体となっている錘部２２からなり、錘カバー３０は、シャフト４を挟んで錘部２２の反対側に位置し、例えば密度が０．００１ｇ／ｍｍ３の樹脂材等で成形されており、偏心錘２０を挟み込む挟み込み部３１及び連結部３２と、振動モータに衝撃が加わった際の当て止めとなる突出部３３からなっている。
シャフト４の中心から錘部２２の最外周までの距離と、同じくシャフト４の中心から突出部３３の最外周までの距離は実質的に等しくなっており、振動モータに衝撃が加わった際には、錘部２２又は突出部３３のいずれかが速やかに外部と接触し、シャフト４に働く力を最小限に抑えることが可能となる。
錘カバー３０は、挟み込み部３１にて偏心錘２０の固定部２１の両側を挟み込み、シャフト４を貫通させることで、偏心錘２０と一緒に固定されている。錘カバー３０がシャフト４の２箇所で固定され、また、中に偏心錘２０を挟み込んで一緒に固定している為、錘カバー３０自体が破損でもしない限り、錘カバー３０が脱落することは無い。また、間に偏心錘２０を挟み込んだ固定の為、錘カバー３０そのものはシャフト４との固定強度を確保する必要は無く、その為、挟み込み部分３１の厚みは最小限で良い。 An eccentric weight 20 and a weight cover 30 are fixed to the shaft 4. The eccentric weight 20 is formed of, for example, a tungsten material having a density of 0.0175 g / mm 3 , and a fixed portion 21 fixed to the shaft 4. The weight cover 30 is integrated with the fixed portion 21, and the weight cover 30 is located on the opposite side of the weight portion 22 with the shaft 4 interposed therebetween. For example, a resin material having a density of 0.001 g / mm 3 is used. It is formed of a sandwiching portion 31 and a connecting portion 32 that sandwich the eccentric weight 20, and a projecting portion 33 that serves as a stopper when an impact is applied to the vibration motor.
The distance from the center of the shaft 4 to the outermost periphery of the weight portion 22 and the distance from the center of the shaft 4 to the outermost periphery of the protruding portion 33 are substantially equal, and when an impact is applied to the vibration motor Any one of the weight portion 22 and the protruding portion 33 can quickly come into contact with the outside, and the force acting on the shaft 4 can be minimized.
The weight cover 30 is fixed together with the eccentric weight 20 by sandwiching both sides of the fixed portion 21 of the eccentric weight 20 at the sandwiching portion 31 and penetrating the shaft 4. Since the weight cover 30 is fixed at two locations on the shaft 4 and the eccentric weight 20 is sandwiched and fixed together, the weight cover 30 will not fall off unless the weight cover 30 itself is damaged. . Further, since the eccentric weight 20 is sandwiched and fixed, the weight cover 30 itself does not need to secure the fixing strength with the shaft 4, and therefore the thickness of the sandwiched portion 31 can be minimized.

錘カバー３０には、開口部３４が成形されており、この開口部３４からは偏心錘２０の固定部２１が露出している。その為、錘カバー３０を偏心錘２０及びシャフト４に設置してからでも、固定部２１を加締めることで偏心錘２０をシャフト４に固定することができ、取付け作業が容易になる。また、併せて、開口部３４を形成した分だけ錘カバー３０の重量が減少する為、振動モータの振動量が向上する。   An opening 34 is formed in the weight cover 30, and the fixed part 21 of the eccentric weight 20 is exposed from the opening 34. Therefore, even after the weight cover 30 is installed on the eccentric weight 20 and the shaft 4, the eccentric weight 20 can be fixed to the shaft 4 by caulking the fixing portion 21, and the attachment work becomes easy. In addition, since the weight of the weight cover 30 is reduced by the amount of the opening 34 formed, the vibration amount of the vibration motor is improved.

図３は本発明の実施例２に係る振動モータの斜視図である。なお、実施例１と同構造の部分には同じ符号を使用し、その説明は省略する。   FIG. 3 is a perspective view of the vibration motor according to the second embodiment of the present invention. In addition, the same code | symbol is used for the part of the same structure as Example 1, and the description is abbreviate | omitted.

本実施例が実施例１と異なる部分は、錘カバー３０’であり、錘カバー３０’の突出部３３’がモータ本体１０付近には無く、モータ本体１０と反対側の錘カバー３０’の先端部分にのみ成形されている。   This embodiment is different from the first embodiment in the weight cover 30 ′. The protrusion 33 ′ of the weight cover 30 ′ is not near the motor main body 10, and the tip of the weight cover 30 ′ on the opposite side of the motor main body 10. Molded only on the part.

錘カバー３０’は、モータに強い力がかかった場合に、どこか一部分でも外部と接触すればシャフト４に働く力を最小限に抑えることが可能になることから、本実施例のような突出部３３’においても本発明の目的は達成できる。加えて、本実施例では錘カバー３０’の重量を最小限に抑えることが可能になる為、振動モータの振動量が向上する。   Since the weight cover 30 ′ can minimize the force acting on the shaft 4 if a strong force is applied to the motor, if any part of the weight cover 30 ′ comes into contact with the outside, it is possible to minimize the force as in this embodiment. The object of the present invention can also be achieved in the portion 33 ′. In addition, since the weight of the weight cover 30 ′ can be minimized in this embodiment, the vibration amount of the vibration motor is improved.

突出部３３’はモータ本体１０付近にのみ成形しても良いが、モータ本体１０と反対側の錘カバー３０’の先端部分に成形するほうが、より速やかに突出部３３’が外部と接触し、シャフト４に働く力を最小限に抑えることが可能になる。   The protrusion 33 ′ may be molded only in the vicinity of the motor body 10, but the protrusion 33 ′ comes into contact with the outside more quickly when the protrusion 33 ′ is formed at the tip of the weight cover 30 ′ opposite to the motor body 10. The force acting on the shaft 4 can be minimized.

図４は本発明の実施例３に係る振動モータの斜視図である。なお、実施例１及び実施例２と同構造の部分には同じ符号を使用し、その説明は省略する。   FIG. 4 is a perspective view of a vibration motor according to Embodiment 3 of the present invention. In addition, the same code | symbol is used for the part of the same structure as Example 1 and Example 2, and the description is abbreviate | omitted.

本実施例では、実施例１の振動モータ構造に加え、シャフト４が端蓋５より他方向にも突出し、シャフト４の両端にそれぞれ、偏心錘２０、４０及び錘カバー３０、５０が固定されている。端蓋５より他方向に突出したシャフト４に固定された偏心錘４０及び錘カバー５０も実施例１と同じく、偏心錘４０は例えば密度が０．０１７５ｇ／ｍｍ３のタングステン材料等で成形されており、シャフト４に固定される固定部４１と、固定部４１と一体となっている錘部４２からなり、錘カバー５０は、シャフト４を挟んで錘部４２の反対側に位置し、例えば密度が０．００１ｇ／ｍｍ３の樹脂材等で成形されており、偏心錘４０を挟み込む挟み込み部（図示せず）及び連結部５２と、振動モータに衝撃が加わった際の当て止めとなる突出部５３からなっている。
シャフト４の中心から錘部４２の最外周までの距離と、同じくシャフト４の中心から突出部５３の最外周までの距離は実質的に等しくなっており、振動モータに衝撃が加わった際には、錘部４２又は突出部５３のいずれかが速やかに外部と接触し、シャフト４に働く力を最小限に抑えることが可能となる。
錘カバー５０は、挟み込み部（図示せず）にて偏心錘４０の固定部４１の両側を挟み込み、シャフト４を貫通させることで、偏心錘４０と一緒に固定されている。錘カバー５０がシャフト４の２箇所で固定され、また、中に偏心錘４０を挟み込んで一緒に固定している為、錘カバー５０自体が破損でもしない限り、錘カバー５０が脱落することは無い。また、間に偏心錘４０を挟み込んだ固定の為、錘カバー５０そのものはシャフト４との固定強度を確保する必要は無く、その為、挟み込み部分（図示せず）の厚みは最小限で良い。 In the present embodiment, in addition to the vibration motor structure of the first embodiment, the shaft 4 protrudes in the other direction from the end cover 5, and eccentric weights 20 and 40 and weight covers 30 and 50 are fixed to both ends of the shaft 4, respectively. Yes. Similarly to the first embodiment, the eccentric weight 40 and the weight cover 50 fixed to the shaft 4 protruding in the other direction from the end lid 5 are formed of, for example, a tungsten material having a density of 0.0175 g / mm 3. And a weight part 42 integrated with the fixing part 41. The weight cover 50 is located on the opposite side of the weight part 42 with the shaft 4 interposed therebetween. Is formed of a resin material or the like of 0.001 g / mm 3, a sandwiching portion (not shown) that sandwiches the eccentric weight 40 and the connecting portion 52, and a projecting portion that serves as a stopper when an impact is applied to the vibration motor 53.
The distance from the center of the shaft 4 to the outermost periphery of the weight portion 42 and the distance from the center of the shaft 4 to the outermost periphery of the protruding portion 53 are substantially equal, and when an impact is applied to the vibration motor Any one of the weight part 42 and the protruding part 53 quickly comes into contact with the outside, and the force acting on the shaft 4 can be minimized.
The weight cover 50 is fixed together with the eccentric weight 40 by sandwiching both sides of the fixing portion 41 of the eccentric weight 40 with a pinching portion (not shown) and penetrating the shaft 4. Since the weight cover 50 is fixed at two locations on the shaft 4 and the eccentric weight 40 is sandwiched and fixed together, the weight cover 50 will not fall off unless the weight cover 50 itself is damaged. . Further, since the eccentric weight 40 is sandwiched and fixed, the weight cover 50 itself does not need to secure the fixing strength with the shaft 4, and therefore the thickness of the sandwiched portion (not shown) can be minimized.

錘カバー５０には、開口部５４が成形されており、この開口部５４からは偏心錘４０の固定部４１が露出している。その為、錘カバー５０を偏心錘４０及びシャフト４に設置してからでも、固定部４１を加締めることで偏心錘４０をシャフト４に固定することができ、取付け作業が容易になる。また、併せて、開口部５４を形成した分だけ錘カバー５０の重量が減少する為、振動モータの振動量が向上する。
また、本実施例においても実施例２と同じく、突出部５３、３３をモータ本体１０付近には成形せず、モータ本体１０と反対側の錘カバー５０の先端部分にのみ成形することも可能である。 An opening 54 is formed in the weight cover 50, and the fixed portion 41 of the eccentric weight 40 is exposed from the opening 54. Therefore, even after the weight cover 50 is installed on the eccentric weight 40 and the shaft 4, the eccentric weight 40 can be fixed to the shaft 4 by caulking the fixing portion 41, and the mounting operation becomes easy. In addition, the weight of the weight cover 50 is reduced by the amount of the opening 54 formed, so that the vibration amount of the vibration motor is improved.
Also in this embodiment, similarly to the second embodiment, the protrusions 53 and 33 can be formed only at the tip portion of the weight cover 50 on the opposite side of the motor body 10 without being formed near the motor body 10. is there.

なお、本発明は上記各実施例に限定されるものではなく、本発明の目的を損なわない範囲で適宜構造の変更が可能である。   In addition, this invention is not limited to said each Example, A structure can be changed suitably in the range which does not impair the objective of this invention.

１…モータケース
２、３…軸受
４…シャフト
５…端蓋
６…保持枠
７…端子部
１０…モータ本体
２０、４０…偏心錘
２１、４１…固定部
２２、４２…錘部
３０、３０’、５０…錘カバー
３１…挟み込み部
３２、５２…連結部
３３、３３’、５３…突出部
３４、５４…開口部 DESCRIPTION OF SYMBOLS 1 ... Motor case 2, 3 ... Bearing 4 ... Shaft 5 ... End lid 6 ... Holding frame 7 ... Terminal part 10 ... Motor main body 20, 40 ... Eccentric weight 21, 41 ... Fixed part 22, 42 ... Weight part 30, 30 ' , 50... Weight cover 31 .. sandwiching portions 32 and 52... Connecting portions 33 and 33 ′ and 53.

Claims (8)

一方より回転自在のシャフトが突出し、他方には端蓋が固定されたモータ本体と、前記シャフトに固定される偏心錘及び前記偏心錘よりも比重の軽い材料で成形された錘カバーからなる振動モータにおいて、
前記偏心錘は、前記シャフトに固定される固定部及び前記固定部と一体となっている錘部からなり、前記錘カバーは前記シャフトを挟んで前記錘部の反対側に位置し且つ前記偏心錘を挟み込んで固定されており、前記シャフトの中心から前記錘部及び前記錘カバー各々の最外周までの距離が実質的に等しいことを特徴とする振動モータ。 A vibration motor comprising a motor body with a rotatable shaft projecting from one end and an end lid fixed to the other, an eccentric weight fixed to the shaft, and a weight cover formed of a material having a lighter specific gravity than the eccentric weight. In
The eccentric weight includes a fixed portion fixed to the shaft and a weight portion integrated with the fixed portion, and the weight cover is located on the opposite side of the weight portion across the shaft, and the eccentric weight The vibration motor is characterized in that the distance from the center of the shaft to the outermost periphery of each of the weight portion and the weight cover is substantially equal. 請求項１に記載の振動モータにおいて、前記錘カバーは前記偏心錘の両側を挟み込み、当該両側において各々前記シャフトに固定されることを特徴とする振動モータ。   2. The vibration motor according to claim 1, wherein the weight cover sandwiches both sides of the eccentric weight and is fixed to the shaft on each of the two sides. 請求項１又は請求項２に記載の振動モータにおいて、前記錘カバーは前記固定部を露出させる開口部を有することを特徴とする振動モータ。   The vibration motor according to claim 1, wherein the weight cover has an opening for exposing the fixing portion. 請求項1乃至請求項３に記載の振動モータにおいて、前記錘カバーは前記シャフトの中心から前記錘部の最外周までの距離と実質的に等しい距離だけ突出した突出部を前記シャフトの長さ方向の一部にのみ持つことを特徴とする振動モータ。   4. The vibration motor according to claim 1, wherein the weight cover has a protruding portion that protrudes by a distance substantially equal to a distance from a center of the shaft to an outermost periphery of the weight portion in a length direction of the shaft. A vibration motor characterized by having only a part of the motor. 一方より回転自在のシャフトが突出し、他方には端蓋が固定されたモータ本体と、前記シャフトは前記端蓋より他方向にも突出し、前記シャフトの両端各々に固定される偏心錘と、当該偏心錘の少なくとも一つと一緒に前記シャフトに固定される前記偏心錘よりも比重の軽い材料で成形された錘カバーからなる振動モータにおいて、
前記偏心錘は、前記シャフトに固定される固定部及び前記固定部と一体となっている錘部からなり、前記錘カバーは前記シャフトを挟んで前記錘部の反対側に位置し且つ前記偏心錘を挟み込んで固定されており、前記シャフトの中心から前記錘部及び前記錘カバー各々の最外周までの距離が実質的に等しいことを特徴とする振動モータ。 A motor body with a rotatable shaft protruding from one side and an end lid fixed to the other, an eccentric weight fixed to both ends of the shaft, the shaft protruding in the other direction from the end cover, and the eccentricity In a vibration motor comprising a weight cover formed of a material having a lighter specific gravity than the eccentric weight fixed to the shaft together with at least one of the weights,
The eccentric weight includes a fixed portion fixed to the shaft and a weight portion integrated with the fixed portion, and the weight cover is located on the opposite side of the weight portion across the shaft, and the eccentric weight The vibration motor is characterized in that the distance from the center of the shaft to the outermost periphery of each of the weight portion and the weight cover is substantially equal. 請求項５に記載の振動モータにおいて、前記錘カバーは前記偏心錘の両側を挟み込み、当該両側において各々前記シャフトに固定されることを特徴とする振動モータ。   6. The vibration motor according to claim 5, wherein the weight cover sandwiches both sides of the eccentric weight and is fixed to the shaft on each of the both sides. 請求項５又は請求項６に記載の振動モータにおいて、前記錘カバーは前記固定部を露出させる開口部を有することを特徴とする振動モータ。   The vibration motor according to claim 5, wherein the weight cover has an opening for exposing the fixing portion. 請求項５乃至請求項７に記載の振動モータにおいて、前記錘カバーは前記シャフトの中心から前記錘部の最外周までの距離と実質的に等しい距離だけ突出した突出部を前記シャフトの長さ方向の一部にのみ持つことを特徴とする振動モータ。   8. The vibration motor according to claim 5, wherein the weight cover has a protruding portion that protrudes by a distance substantially equal to a distance from a center of the shaft to an outermost periphery of the weight portion in a length direction of the shaft. A vibration motor characterized by having only a part of the motor.
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