Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2002-10-29
2004-03-02
Lam, Thanh (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S015000, C310S023000, C310S027000
Reexamination Certificate
active
06700251
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a vibrating device having an axially driven movable member, and more particularly to a vibrating device mounted in a portable telephone for signaling a user by vibration of the movable member.
In recent years, there is popularized various portable instruments such as portable telephone, PDA (Personal Digital Assistant), wearable computing instruments and so forth. In these instruments, vibrating devices are mounted for informing signals, by vibration without producing sounds.
FIG. 6
is a perspective view showing a conventional vibration device disclosed in Japanese Patent Laid Open 7-107699. A direct current motor
131
has a rotating shaft
136
supported by a bearing
133
. There is formed an annular groove
135
on which an eccentric weight
134
is secured by a fixer
140
.
In such a motor, since a commutator and a brush assembly are provided, or manufacturing cost increases. It takes a time before the rotating speed approaches 7000~8000 rpm. Therefore, the device is improper to a device which vibrates in accordance with a music signal. Furthermore, arcs generated between the commutator and brushes cause the quality and the life of the motor to reduce.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a vibrating device which may be manufactured at a low cost and has a high performance.
According to the present invention, there is provided a vibrating device comprising an axially elongated frame, a hollow yoke having an axially elongated shape and an opening at an end thereof, and axially movably provided in the frame, a cylindrical permanent magnet securely provided in the yoke, a coil bobbin cantilevered in the frame and having an end portion inserted in the yoke from the opening and in a space between the yoke and the permanent magnet, a driving coil mounted on the coil bobbin, at least one coil spring provided for resiliently holding the yoke in the frame.
The yoke has a hollow cylindrical form, and the yoke has a cup shape.
At least one weight is secured to a bottom of the yoke.
A plurality of guide projections are provided on an inside wall of the frame for movably supporting the yoke.
A pole piece made of magnetic material is secured to an end of the permanent magnet.
The device further comprises a plurality of axial grooves in each of which the guide projection is axially movably engaged.
These and other objects and features of the present invention will become more apparent from the following detailed description with reference to the accompanying drawings.
REFERENCES:
patent: 5903076 (1999-05-01), Suyama
patent: 6268671 (2001-07-01), Furuki
patent: 6404085 (2002-06-01), Hamaguchi et al.
patent: 6486579 (2002-11-01), Furuya et al.
patent: 2001/0030474 (2001-10-01), Sakai et al.
patent: 2002/0089247 (2002-07-01), Ibata et al.
Aihara Kenshi
Kobayashi Takashi
Miura Naoki
Miyamoto Kazumi
Nikaido Akira
LandOfFree
Vibrating device for axially vibrating a movable member does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vibrating device for axially vibrating a movable member, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vibrating device for axially vibrating a movable member will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3244609