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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vibratory buzzer which conveys information of a call by occurrence of vibration instead of calling
by the sound of a portable pager (pager). SUMMARY OF THE INVENTION The present invention
uses a spring as a vibration buzzer of a pager and a permanent magnet as a vibrating weight and
an additional mass, and the magnet is vibrated in a linear reciprocating motion by a current
supplied to a coil, thereby achieving compactness and low cost. And a low power consumption
vibration buzzer. 2. Description of the Related Art As shown in FIG. 2, conventionally, a vibrating
buzzer used for a pager applies a load of eccentric center of gravity 18 to a rotating shaft of a
motor 17 and generates vibration by rotation of the motor. [Problems to be Solved by the
Invention] In the prior art, the use of a rotating motor as a power is costly, and the weight of the
center of gravity is shaken to cause severe wear on the hairs and brushes of the motor and a
short life. There was a point. [Means for Solving the Problems] In order to solve the problems of
the prior art, the present invention uses a permanent magnet and an additional mass as a spring
and an oscillating weight instead of a motor, and generates a magnet by a current flowing
through a coil. It was configured to be linearly oscillated back and forth along the shaft.
[Function] The life of the bearing can be improved since the oscillating weight oscillates only
along the shaft, and the cost can be reduced because the spring, permanent magnet and coil are
used. Embodiments of the present invention will be described below with reference to the
drawings. The appearance of the vibration buzzer according to the present invention is nearly
cylindrical, and FIG. 1 is a cross-sectional view in which the central portion is vertically divided.
In the figure, the vibration buzzer 30 has an oscillating weight 31 and oil-impregnated bearings
7. Magnet 8. Additional mass 15. The impact member 16 is supported by a vibrating weight 31
and a spring 2 in a floating state, and the magnet 8 is configured to be in a fixed position when
stopped. The shaft 12 is driven into the center of the case pig 3, and the oil-impregnated bearing
7 can slide on the shaft 12. The spring retainer 4 holds the spring 2 by groove or insert molding,
and holds the shaft 12 at the center. The drive coil 5 and the detection coil 6 are disposed
outside the magnet 8 with a minute gap, and although only one terminal is shown on the coil
bobbin 14, the coil terminals 5a, 5b 6a, 6b are planted, and the electronic component 10 is
constructed. And the power supply line 11 is connected to the mounted circuit board 9, and the
case pig 13 holds and protects the circuit board. In addition, the case 1 accommodates all these
parts and has a substantially cylindrical shape. Next, the operation will be described with
reference to the circuit diagram of FIG.
When power is supplied from the power supply line 11, an electric current flows through the
drive coil 5 and the magnet 8 integral with the oil-impregnated bearing 7 is moved by the
magnetic field generated by the drive coil 5 while receiving the resistance of the spring 2.
However, as the resistance of the spring 2 increases, the moving speed decreases, so the
induction voltage of the coil decreases, the current of the amplification transistor 19 decreases,
and the current of the drive coil 6 decreases, and the driving force decreases. The resistance is
added and the speed is rapidly reduced, and the induced voltage of the coil becomes almost zero,
so the transistor 19 is cut off and the current does not flow in the drive coil 5. Therefore, the
vibrating weight including the spring 2 and the magnet 8 freely vibrates and reaches the
maximum movement point in the reverse direction, and then moves in the forward direction
again by the energy of the spring 2, and again to the drive coil 5 by the induced voltage by the
detection coil 6. The current flows and the force acts on the magnet. The above explanation is
about DC operation about the electromagnetic action by the magnet 8 and the two coils 5 and 6,
but in detail, efficient linear operation is performed by setting the operating point and time
constant by the capacitor 21 and the resistor 22 As in the circuit shown in FIG. 4, the ground
terminal of the detection coil 6 can be selected to have an appropriate polarity. In any case, by
the action of the coils 5, 6 and the magnet 8, the vibrating weight 31 connects the vibration in
the direction parallel to the shaft 12 as shown by arrows a and a ', and this vibration is
transmitted to the outside through the case. It will be done. Since this vibration frequency is
mainly determined by the spring constant of the spring 2 and the mass of the vibrating weight,
the vibration frequency can be set arbitrarily by adjusting the mass of the additional mass 15.
Further, in the present invention, the size is adjusted to such a condition that the impact member
16 and the projection 3 'provided on a part of the case pig 3 collide in the process before
reaching the maximum amplitude of the vibration weight. Large vibrations can be transmitted to
the outside. As described above, according to the present invention, since the vibration weight
oscillates back and forth along the shaft, the life of the bearing is improved, and since the morph
is not used, the brush whose life is affected becomes unnecessary and is further wound around a
bobbin. The use of a coil makes it easy to manufacture the coil and has the effect of significantly
reducing the cost.
Brief description of the drawings
1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is an external view
of a motor type vibration unit applied to a conventional pager, and FIG. 3 is a circuit diagram of
the embodiment of the present invention. FIG. 6 is another circuit diagram of an embodiment of
the present invention.
■ · · · Case cover 2 · · · Spring 3.13 · · · Case pig 3 ・ ・ ・ · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · 4 · · · Detection coil terminal 8 · · · Magnet 10 · · · electronic components 12 · · ·
shaft 15 · · · additional mass 17 · · · motor 19 · · · transistor 20, 21 · · · capacitor 30 · · · vibration
buzzer 6 · · · · · · · · · · · · · · · · · · · · · · · · · detection coil · oil-impregnated bearing · circuit board ·
power supply line · coil Pobin · impact member · eccentricity weight 22 · · · resistance 31 · · · ·
Vibration excitation weight or more Applicant Seiko Electric Parts Co., Ltd. Attorney Attorney
Hayashi Takayuki