Vibrating device for transmitting information

Details Vibrating device for transmitting information Vibrating device for transmitting information

2002-10-29

2004-04-13

Mullins, Burton S. (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S080000

Reexamination Certificate

active

06720691

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a vibrating device mounted in a portable device such as a portable telephone and PDA (personal digital assistant), for transmitting information to a wearer.
FIG. 2
is a sectional view showing a conventional vibrating device disclosed in Japanese Patent Laid Open 7-107699.
The vibrating device
53
comprises a first assembly
51
and a second assembly
52
The first assembly
51
comprises a first frame
61
made of resin and having a dish-like shape and a vibrating assembly
66
resiliently supported in the first frame by an annular spring plate
62
. The vibrating assembly
66
comprises a yoke
63
made of magnetic material comprising a center pole
63
a
and a flange
63
b
, an annular permanent magnet
64
secured to the flange
63
b
, and an annular top plate
65
made of magnetic material and secured to the permanent magnet
64
. The underside of the first frame
61
is covered by a protector
67
.
The second assembly
52
comprises a second frame
71
made of resin and secured to the first frame
61
at shoulders
61
a
and
71
a
, and an annular spring plate
72
embedded in the second frame
71
and secured to the top plate
65
for holding the vibrating assembly
66
. A supporting plate
73
is secured to the second frame
71
to close the second frame
71
. An annular driving coil
74
is secured to an annular projection
73
a
formed on the underside of the supporting plate
73
. The coil
74
is inserted in a magnetic gap
66
a
between the center pole
63
a
and the top plate
65
. The coil
74
is connected to a driving circuit through a terminal means
68
.
When a signal current is applied to the driving coil
74
, the vibrating assembly
66
vibrates. The vibration is transmitted to a wearer through the first frame
61
and a case of a portable device in which the vibrating device
53
is mounted.
The conventional vibrating device has disadvantages that the coil
74
breaks by lateral movement of the yoke
63
a
and top plate
65
when receiving external shock.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a vibrating device a vibrating assembly of which is protected from external shock.
According to the present invention, there is provided a vibrating device comprising a frame, a vibrating assembly comprising a yoke having a center pole and a peripheral flange, an annular permanent magnet secured to the flange, and an annular top plate secured to the permanent magnet, supporting means for resiliently supporting the vibrating assembly in the frame, an annular driving coil inserted in a magnetic gap formed between the yoke and the top plate, preventing means for preventing the vibrating assembly from being moved in a radial direction of the vibrating assembly.
The device further comprises a cylindrical center piece secured in the center pole of the yoke.
The preventing means comprises a hole formed in the center piece at an axis, and a central shaft securely mounted in the frame and slidably engaged in the hole of the center piece.
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: 5267111 (1993-11-01), Nishimura et al.
patent: 5424592 (1995-06-01), Bluen et al.
patent: 6365995 (2002-04-01), Fukuda et al.
patent: 6404085 (2002-06-01), Hamaguchi et al.
patent: 6417589 (2002-07-01), Kuyama et al.

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