Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-01-24
2004-06-01
Nguyen, Tran (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S156120, C310S156390
Reexamination Certificate
active
06744163
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a vibration type brushless motor utilized for a vibration generating source of a pager and a portable telephone for which demand is rapidly increasing.
2. Description of the Related Art
FIG. 23
is an exploded view of a vibration type motor of the prior art.
FIG. 24
is a cross sectional view of another vibration type motor of the prior art.
FIG. 25
is a perspective view of a rotor utilized for a vibration type motor of the prior art.
FIG. 26
is a perspective view of another type of rotor utilized for a vibration type motor of the prior art.
The Japanese Patent Application Laid-open Publication No. 7-20063/1995 discloses the vibration type motor shown in FIG.
23
. As shown in
FIG. 23
, an unbalance-weight
9
is inserted into a shaft P
3
. By the rotation of the shaft P
3
mounted with the unbalance-weight
9
, vibration is generated.
The Japanese Patent Application Laid-open Publications No. 9-93862/1997 and No. 2000-262969 disclose a vibration type motor shown in FIG.
24
. As shown in
FIG. 24
, an unbalance-weight
9
is mounted on an outer circumference area of a rotor
8
. Vibration is generated by rotating the rotor
8
mounted with the unbalance-weight
9
. Further, the Japanese Patent Application Laid-open Publication No. 11-341769/1999 also discloses the similar construction to the vibration type motor shown in FIG.
24
.
The Japanese Patent Application Laid-open Publications No. 2-17853/1990 and No. 9-294352/1997 disclose a rotor
8
shown in
FIGS. 25 and 26
respectively. In
FIG. 25
, a part of a flat coil
10
is removed from the rotor
8
. In
FIG. 26
, a weight
11
is provided on the rotor
8
instead of a flat coil having been removed. In either case, the rotor
8
generates vibration due to unbalanced rotation of the rotor
8
.
Furthermore, the Japanese Patent Application Laid-open Publication No. 2-17853/1990 discloses that vibration caused by unbalanced rotation of a rotor is generated by reducing a number of windings or coil shape of one coil out of three air-core coils. Moreover, the Japanese Patent Application Laid-open Publication No. 9-93862/1997 discloses that vibration is generated by a rotation of rotor of which center of gravity is shifted eccentrically by attaching a deformed metal member having high specific gravity on an outer circumference area of a coreless rotor formed integrally with air-core coils by resin.
As mentioned above, each vibration type motor disclosed by the Japanese Patent Application Laid-open Publication Nos. 7-20063/1995, 9-93862/1997 and 2000-262969 is on the basis of the construction of mounting the unbalance weigh on the shaft. Consequently, a total cost of the vibration type motor increases by the unbalance weigh in addition to the basic part cost of the motor itself. Further, manpower for mounting the unbalance-weight on the shaft also increases. Furthermore, it is hard to miniaturize a motor having such the construction because an extra space for rotating the unbalance-weight is necessary for the motor externally or internally.
In the case of each vibration type motor disclosed by the Japanese Patent Application Laid-open Publication Nos. 2-17853/1990 and 9-294352/1997, its construction is composed of a movable flat coil. However, higher effect of vibration can not be obtained.
In the case of the vibration type motor disclosed by the Japanese Patent Application Laid-open Publication No. 2-17853/1990, mass of the air-core coil itself is too small to obtain enough vibration. In the case of the vibration type motor disclosed by the Japanese Patent Application Laid-open Publication No. 9-93862/1997, there also existed a problem such that the deformed member formed by a metal having high specific gravity is essential.
SUMMARY OF THE INVENTION
Accordingly, in consideration of the above-mentioned problems of the prior art, an object of the present invention is to provide a vibration type motor, which can improve vibration effect without increasing cost or manpower for assembling.
In order to achieve the above object, the present invention provides, according to a first aspect thereof, a vibration type brushless motor in a structure of brushless motor having an outer rotor type core comprising: a rotor yoke; a shaft of which one end is held by a bearing member so as to rotate freely and another end is fixed to a center of rotation of the rotor yoke; a magnet in an arc; and a ring core arranged around the shaft, the rotor yoke having a side section being formed in a shape of which a part is cut off radially to the outer circumference direction from the center of rotation of the rotor yoke fixed with the other end of the shaft, wherein the ring magnet is fixed to the side section of the rotor yoke with facing the ring core, the vibration type brushless motor is further characterized in that vibration is generated by unbalanced vibration of the rotor yoke.
According to a second aspect of the present invention, there provided a vibration type brushless motor in a structure of brushless motor having an outer rotor type core comprising: a rotor yoke; a shaft of which one end is held by a bearing member so as to rotate freely and another end is fixed to a center of rotation of the rotor yoke; a magnet in an arc; and a ring core arranged around the shaft, the rotor yoke having a ceiling section formed in a disc shape with centering the center of rotation of the rotor yoke fixed with the other end of the shaft and a side section connecting with an outer circumference edge of the ceiling section, wherein a part of the side section is cut off in a circular arc, and wherein the ring magnet is fixed to the side section of the rotor yoke with facing the ring core, the vibration type brushless motor is further characterized in that vibration is generated by unbalanced vibration of the rotor yoke.
According to a third aspect of the present invention, there provided a vibration type brushless motor in a structure of brushless motor having an outer rotor type core comprising: a rotor yoke; a shaft of which one end is held by a bearing member so as to rotate freely and another end is fixed to a center of rotation of the rotor yoke; a magnet in an arc; and a ring core arranged around the shaft, the rotor yoke having a ceiling section formed in a disc shape with centering the center of rotation of the rotor yoke fixed with the other end of the shaft and a side section connecting with an outer circumference edge of the ceiling section, wherein a part of the ceiling section is cut off radially to an outer circumference direction from the center of rotation of the rotor yoke, and wherein the ring magnet is fixed to the side section of the rotor yoke with facing the ring core, the vibration type brushless motor is further characterized in that vibration is generated by unbalanced vibration of the rotor yoke.
According to a fourth aspect of the present invention, there provided a vibration type brushless motor in a structure of an axial gap type brushless motor comprising: a rotor composed of a rotor yoke having a ceiling section, a magnet fixed to the rotor yoke and a shaft of which one end of the shaft is fixed to a center of rotation of the rotor yoke and another end of the shaft is held by a bearing member so as to rotate freely; and a plurality of air-core coils arranged in a ring around the bearing member, the magnet in one shape out of a circular arc of which a part is cut off radially to an outer circumference direction from the center of rotation of the rotor yoke and a disc of which a part is cut off a part of the magnet, wherein the ring magnet is arranged to face the plurality of air-core coils, the vibration type brushless motor is further characterized in that vibration is generated by unbalanced vibration of the rotor.
According to a fifth aspect of the present invention, there provided a vibration type brushless motor in a structure of an axial gap type brushless motor comprising: a rotor composed of a rotor yoke having a ceiling section, a magn
Iwai Hiroshi
Kajiwara Hidetoshi
Connolly Bove & Lodge & Hutz LLP
Nguyen Tran
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