Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-12-27
2001-08-14
Ponomarenko, Nicholas (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S081000, C361S807000, C361S816000
Reexamination Certificate
active
06274955
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Technical Field of the Invention
The present invention relates to a vibration motor which is used in a portable electronic equipment such as a portable telephone, a pocket bell or the like, and which silently informs a user of incoming etc. by vibration, and relates to a portable electronic equipment having the vibration motor.
2. Description of the Related Art
JP-A-10-248203 discloses one of conventional vibration motors used as silent information sources in miniature radio communication equipment, in which a cored-type brushless vibration motor is disclosed.
FIG. 6
is a sectional view of a main portion of the cored-type brushless vibration motor.
In
FIG. 6
, a bearing holder portion
102
is provided at the center of a bracket
101
forming the bottom of the vibration motor. This bearing holder portion
102
has a catch portion
103
and an erected portion
104
formed by cutting and erecting a part of the bracket
101
.
A sintered oilloss bearing
105
is attached to the inside of this bearing holder portion
102
through a cover plate
106
, and a stator core
109
having an armature coil
110
wound on a plurality of salient poles
107
is attached to the outside.
A rotor
110
has a magnet holder
111
and a cylindrical magnet
113
fixed to the magnet holder
111
and having a plurality of field poles disposed in a blade portion
112
of the stator core
109
through a radial gap. Further, the rotating body
110
is fitted by pressing a shaft
115
into a burring hole
114
disposed at the rotation center of the magnet
113
. In addition, one end of the shaft
115
is rotatably supported by the sintered oilloss bearing
105
, and the other end is rotatably supported through a similar sintered oilless bearing by a case
116
having another function as a cover.
In addition, a power supply method is to connect a terminal of the coil to one side of a flexible printed board so as to drive the motor.
However, in the above-mentioned conventional art, a usual vibration motor is extracted by an automatic sucking machine, automatically arranged on a board and subjected to assembling in a normal automatic assembling/wiring process in the case where the vibration motor is supplied by a parts maker in the packaged form of a pallet, a reel or the like. In that case, first, the vibration motor cannot be extracted by the automatic sucking machine if the vibration motor has a shape similar to that as mentioned above. That is, the automatic sucking machine sucks the ceiling of a part pneumatically. However, the aforementioned vibration motor is not even in the ceiling of the vibration motor because a sintered oilless bearing for rotatably supporting a shaft lies at the center of a cover. Therefore, even if the ceiling is sucked pneumatically by the automatic sucking machine, the air leaks from a gap between the shaft and the bearing so that sucking of the ceiling cannot be performed.
Further, since the vibration motor in the conventional art is not designed to suit a reflow soldering, special parts are required for assembling the vibration motor into a miniature radio communication equipment and holding the vibration motor therein, and the work for making the above operation demands expert employees, so that the number of labor-hour and the cost are increased. It is therefore necessary to make the vibration motor at least suitable for the reflow soldering so that the vibration motor can be applied to an automatic assembling process for mass production.
In the reflow soldering method, after parts to be mounted are arranged on a printed board, the parts and the board are passed through a reflow furnace so as to be connected with each other by solder. This solder is obtained in a way such that creamy solder is passed through an atmosphere at a high temperature to be fused and then the fused solder is solidified after being cooled. Here, it is necessary to pay attention to the case where solder balls scattering in the reflow furnace adhere to a coil or a magnet in the middle of the reflow soldering. In that case, it is necessary to give enough consideration to such a trouble that such an adhering solder ball blocks starting when the vibration motor starts, or such a solder ball rubs on the coil, the magnet or the like so as to generate irregular noise, etc.
In addition, even if the vibration motor is mounted on the printed board, it is necessary to perform accurate or proper positioning of the vibration motor. It is therefore necessary to take a dimensional measurement of the mounted position of the vibration motor. There are a large number of problems like the above matters when the reflow soldering is performed.
That is, in order to perform the reflow soldering perfectly so as to automate a wiring/assembling process, there has been a problem that automation must be fulfilled in all the steps of the following items 1 to 4 while the quality have to be also guaranteed.
1. To extract supplied parts by means of an automatic sucking machine or the like.
2. To arrange the extracted parts onto a printed board automatically.
3. To take measures against solder balls in a reflow furnace.
4. To inspect the positions of the parts after the parts are mounted.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a vibration motor holding apparatus in which a configuration of a vibration generating means is realized with guaranteed quality by all the steps of extracting supplied parts, automatically arranging the parts onto a printed board, taking measures against solder balls in a reflow furnace, and identifying/inspecting the positions of the parts after the parts are mounted, in order to perform reflow soldering upon the vibration generating means together with other electronic parts on the same printed board in a lump without using any special parts such as elastic or inelastic holding members or the like.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a vibration motor holding apparatus comprising: a rotating body having a rotary member provided on an external surface of a base, and a cover for covering the rotary member; and a board on which the rotating body is mounted; wherein a position identifying mark is provided on the board in order to mount the rotating body in a predetermined position on the board, the position identifying mark being exposed or bared in the outside of an outline of the rotating body when the rotating body is mounted in the predetermined position on the board.
With this configuration, in the case where a motor such as a cored-type brushless motor, a coreless brushless motor, a brush-type motor, or the like, is used as a vibration motor to function as a rotating body, when the rotating body of any type of such motors is mounted on a printed board, automatic arrangement of the rotating body on the printed board can be made easily by automatically sucking the ceiling of the cover of the rotating body. It can be confirmed from above that the identification mark provided outside the rotating body attachment position on the board is hidden by the rotating body if the position of the rotating body mounted on the board is abnormal, while the mark is exposed or bared in the outside of the rotating body when the position is normal. It is therefore possible to easily identify, judge and inspect whether terminals on the base on the rotating body side are surely connected to corresponding main-body lands on the board or not, whether the terminals are short-circuited with other lands or not, whether the rotating body does not abut against other parts or not, and so on.
According to a second aspect of the present invention, there is provided a vibration motor holding apparatus comprising a vibration motor having a base in which terminals are formed on a back surface or a side surface of the base, a stator in which a coil is wound around a stator core, a magnet disposed in opposition to the stator, and a cover provided to cover the stator and tho magnet, the stator and the m
Hirai Koutarou
Satoh Noriyoshi
Dinh Le Dang
Matsushita Electric - Industrial Co., Ltd.
Pearne & Gordon LLP
Ponomarenko Nicholas
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