Vibration motor

Details Vibration motor Vibration motor

2002-06-05

2003-07-29

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S089000, C310S091000

Reexamination Certificate

active

06600245

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coin-type vibration motor mounted inside a mobile communication device such as a mobile telephone to be used as call-receiving means, and more particularly to a vibration motor capable of improving the assemblage efficiency of a connector header to maintain a securely fixed position.
2. Description of the Prior Art
In general, one of inevitable functions for a mobile communication terminal is a call-receiving function. The call-receiving function indicates call-receiving most frequently via a melody mode for producing sound and a vibration mode for shaking the terminal. In other words, if a user previously selects a mode necessary for call-receiving, the selected mode operates at the tie of call-receiving to allow the user to detect call-receiving.
In the above call-receiving modes, the vibration mode i s generally used for allowing others to keep from noise in a place crowded with people. In general, the vibration mode drives a small-sized vibration motor to transfer a vibrating force into a housing of the terminal so that terminal may vibrate.
In the meantime, a vibration mode conventionally in use is driven by a vibration motor which is additionally mounted inside the terminal. Examples of the most representative vibration motors include a so-called pan cake-type or coin-type vibration motor which has an external configuration with the diameter relatively larger than the thickness as shown in
FIGS. 1 and 2
.
A vibration motor configured as above is provided at the bottom with a plate-shaped lower housing
100
having a tubular burring section
100
a
which is projected for a certain height in a central section of the lower housing. The tubular burring section
100
a
has a shaft hole in the center so that the lower end of a shaft
140
is fixed through interference insertion. To the upper face of the lower housing
100
is attached a lower board
110
having a printed circuit to which external power can be applied and a terminal section
110
a
projectedly extended beyond an upper housing.
To the upper outer circumference of the lower housing
100
having the lower board
110
attached thereto as above, is provided a ring-shaped magnet
130
which has a vertically perforated space at the center and N and S poles alternatingly magnetized along the circular circumference thereof with the same interval.
In the lower board
110
provided under the perforated central space of the magnet
130
, a pair of brushes
120
are spaced with a predetermined angle from each other, and have one ends respectively connected to input and output terminals of the lower boards
110
and the other ends positioned higher than the upper face of the magnet
130
.
In the meantime, to the outer circumferential end of the lower housing
100
is coupled a cylindrical upper housing
150
for covering the lower housing
100
from the upside. The upper housing
150
is configured to axially support the upper end of a shaft
140
which has the lower end axially supported in the lower housing
100
.
The shaft
140
supported to the lower housing
100
, the lower board
110
, the magnet
130
, the pair of brushes
120
and the upper housing
150
constitute a stator in the vibration motor. A rotor
200
is installed rotatable about the stator, and comprises an upper board
210
, a commutator
220
and wound coils
240
.
The upper board
210
is a printed circuit board supported to the shaft
140
and a bearing b in an eccentrically rotatable fashion. The upper board
210
is integrally provided in a face opposed to the lower housing
100
with the commutator
220
constituted of a number of segments. For electric conduction, the segments contact to the upper ends of the pair of brushes
120
with the lower end connected to the lower board
110
.
The wound coils
240
are attached to the upper face of the upper board
210
where a circuit is not printed. Although two wound coils
240
are provided as shown in
FIG. 2
, one wound coil may be alternatively provided due to a driving mode of the vibration motor. In particular, if at least two wound coils are provided, the coils are spaced from each other with a predetermined angle.
Further, the upper board
210
to which the wound coils
240
are not attached is integrally provided with an insulator
250
for insulation between the wound coils
240
and increase of eccentric load. Through insert injection, the insulator
250
is formed integral with the commutator
220
and the wound coils
240
which are attached to the upper board
210
during manufacture thereof. Between the adjacent pair of wound coils
240
is provided a weight having a high specific gravity for maximizing the amount of eccentricity.
The conventional vibration motor configured as above has a connector header
300
electrically connected to the terminal section
110
a
of the lower board
110
. The connector header
300
has a substantially rectangular configuration with one circular face for closely contacting to the outer circumference of the upper housing
150
.
The connector header
300
is attached to the outer circumference of the upper housing
150
via adhesive t, and constituted of a body
300
a
having an opened configuration at the upper and both sections and a pair of terminals
310
and
320
installed inside the body
300
a
. The terminals
310
and
320
have circularly bent structures so that the upper ends elastically project upward.
The conventional vibration motor configured as above is applied with electric current as the terminals
310
and
320
of the connector header
300
connect to an external system board (not shown). Current is induced into the commutator
220
via the brushes
120
of the lower board connected to the connector header
300
. The commutator
220
transfers current into the wound coils
240
along the printed circuit on the upper board
210
. Then, a magnetic flux generated from the wound coils
240
reacts with a magnetic flux generated from the magnet
130
to produce an electromagnetic force thereby rotating the rotor
200
.
In this case, the rotor
200
is eccentrically supported to the shaft
140
so as to realize an eccentric drive. This causes an eccentric driving force to be transferred to the lower housing
100
and the upper housing
150
via the shaft
140
incurring vibration. This is utilized as silent call means of the mobile communication terminal.
However, in the above vibration motor of the prior art, the connector header
300
has the configuration to be simply fixed to the outside of the upper housing
150
via adhesive t. The connector header
300
may be easily played or detached from the upper housing
150
rather than maintaining a securely fixed position under external impact or dropping. Further, the terminals
310
and
320
which are mounted inside the connector header
300
and outwardly projected at one ends are not provided with any specific support structure. Thus, the terminals
310
and
320
may be easily deformed to cause contact defect under impact.
SUMMARY OF THE INVENTION
Accordingly the present invention has been made to solve the above problems of the prior art and it is an object of the invention to provide a vibration motor, in which a connector header is coupled to an outer face of a housing via welding to maintain a securely fixed position even under external impact or dropping.
It is another object of the invention to provide a vibration motor, in which terminals provided in a connector header can be restored to the initial positions even under external force to enhance the reliability of an article.
According to an aspect of the invention to obtain the above objects, it is provided a vibration motor comprising: a lower housing with a rim portion bent into the shape of a disk to form a flange; an upper housing inserted around the flange of the lower housing and covering an upper portion thereof to form an inner space; a lower board coupled to an upper face of the lower housing, the lower board having one end extended

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