JP2877758B2 - Vibration generator for information - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a notification vibration generator incorporated in a portable communication device such as a portable telephone or a pager, or a small device such as a wristwatch or a toy.

[0002]

2. Description of the Related Art A small device such as a portable communication device is provided with a notifying means for notifying an incoming call, a predetermined time, and the like. Most of the notification means is based on a sound such as a bell. However, in recent years, in consideration of surrounding people, in addition to the notification means by sound, a notification means by vibrating the device is built in, and both notification means are used according to the situation, or There is an increasing number of small devices that selectively use the notification means. FIGS. 4 (a) and 4 (b) show conventional sounding devices.
There is a ringer (8) like this. This means that a magnetic circuit portion composed of a permanent magnet (81) and a yoke (82) is
4) Fix inside. Then, the coil (83) is fixed to the yoke (82), and the diaphragm (80) is provided at a position facing the yoke (82). The peripheral edge of the diaphragm (80) is fixed to the case (84), and the upper lid (85) having an opening is fixed to the case (84). When a current is applied to the coil (83), the yoke (82) is turned into an electromagnet, and a magnetic pole is generated at the tip. Due to the magnetic poles generated in the yoke (82) and the magnetic poles of the diaphragm (80), the diaphragm (80) is attracted to the yoke (82) if it has a different polarity, and if it has the same polarity, the yoke (8).
2) I will be repelled. Therefore, by intermittently supplying a current to the coil (83), the diaphragm (80) repeats the above operation, vibrates the air to generate a sound wave, and the sound wave is generated by the upper lid (8).
The light propagates outside through the opening of 5). By setting the frequency of the diaphragm (80) to a frequency in the audible range (about 20 Hz to about 20 kHz), sound notification can be realized. As a conventional vibration generator, a cylindrical DC motor (90) having an eccentric weight (92) provided on a rotating shaft (91) as shown in FIG. 5 is most often used. When the motor (90) is energized, the eccentric weight (92) rotates together with the rotating shaft (91), thereby generating vibration. By transmitting the vibration to the device, the notification by the vibration can be realized.

[0003]

Conventionally, in a device incorporating both a sound notification unit and a vibration notification unit, as described above, a sound generation device for generating a sound and a vibration generation device for generating a vibration are used. One had to deploy each one. Therefore, a wider space is required in the device than when only one notification device is used.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a notification vibration generator having both a sound generation function and a vibration generation function.

[0005]

Means for Solving the Problems To solve the above problems,
The present invention includes a first vibrating body that includes a permanent magnet and is supported by a fixed member by a first spring body, and a coil that is disposed to intersect the magnetic flux of the permanent magnet, and includes a fixed member that is fixed by a second spring body. And a current-carrying unit connected to the coil and supplying a current of a predetermined frequency to the coil. The first vibrator and the first vibrator
One of the first vibration system formed by a spring body and the second vibration system formed by the second vibration body and the second spring body generates a sound wave whose frequency is in an audible range and propagates to the outside. The other vibration system is used as a vibration source that transmits vibration to the fixed member and vibrates the device. Furthermore, the present invention is connected to the energizing section,
The frequency of the current conducting portion is energizing the coil, the first vibration system substantially matches the frequency to the natural frequency f ₀₁ of, or switch to a frequency that substantially coincides with the natural frequency f ₀₂ of the second vibration system A switching circuit can be provided.

[0006]

When the coil is energized by the current supply unit to the notification vibration generating device having the above-described configuration, a current and a magnetic field are transmitted between the first vibrator having the permanent magnet and the second vibrator having the coil. Electromagnetic force acts due to the interaction. Therefore, by applying a current whose current value changes periodically to the coil, forced vibration is generated in the first vibration system and the second vibration system, in which the electromagnetic force is a periodic force. Due to the forced vibration, a vibration system used as a sound source generates a sound wave whose frequency is in an audible range and propagates to the outside, and a vibration system used as a vibration source transmits a vibration to a fixed member to cause a device to operate. Vibrate. In addition, by providing the above-described switching circuit in the notification vibration generating device of the present invention, the current-carrying unit is configured to supply a current having a frequency substantially equal to one of the natural frequencies of the first vibration system and the second vibration system. Is supplied to the coil. At this time,
A resonance phenomenon occurs in the vibration system having the natural frequency, and the amplitude of the vibration system becomes maximum.

[0007]

According to the present invention, a vibration generator for notification generates forced vibrations in two vibration systems by one electromagnetic drive component, and one of the vibration systems can provide a sound generating function as a sound source by the vibration. The other vibration system can provide the vibration function of the device as a vibration source. As a result, the notification device can be reduced in size and cost. In addition, a resonance phenomenon can be generated in one vibration system by the switching circuit,
Either sound or vibration of the device can be generated exclusively. Therefore, either the sound generation function or the vibration function of the device can be provided by the switching circuit.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. The energizing section (6) for supplying a current of a predetermined frequency to the coil (40) and the switching circuit (60) for switching the frequency are conventionally known as general circuits. FIGS. 1A and 1B show a notification vibration generating device according to the present embodiment.
And a fixing member (5) for supporting the vibration system. In the present embodiment, the fixing member (5) includes a lower case (50) that supports the first vibration system, and an upper case (51) that supports the second vibration system and is coupled to the lower case (50). Then, two vibration systems are housed in a space formed inside by coupling the lower case (50) and the upper case (51). Upper case (5
At the center of 1), an opening (5
2) is open.

The first vibration system includes a first spring body (1) formed by using an elastic material such as a thin metal plate, rubber, resin or the like so as to be deformable in a direction perpendicular to the surface, and a permanent magnet (30). The first vibrating body
(3), on the inner peripheral side of the first spring body (1),
The first vibrating body (3) is attached by adhesion or the like, and the outer peripheral side of the first spring body (1) is attached to the lower case (50) by adhesion or the like. Thereby, the first vibration system can vibrate up and down with respect to the lower case (50). FIG. 1 shows the first spring body (1).
As shown in (a), the fixing member (5) and the first vibrating body (3)
There is a spiral cut between the parts that are fixed to
You. The first vibrating body (3) including the permanent magnet (30) is provided with a permanent magnet to prevent leakage of a magnetic field to the outside and efficiently generate an electromagnetic force acting by the interaction between a current and a magnetic field.
An upper yoke (31) and a lower yoke (32) are provided above and below (30), respectively, thereby forming a magnetic circuit. permanent magnet
The upper yoke (31) is formed in a ring shape having a vertical wall on the inner periphery, and the lower yoke (32) ) Is formed in a disk shape having a raised portion at the center. A magnetic gap (3) is provided between the vertical wall of the upper yoke (31) and the central ridge of the lower yoke (32) so that a second vibrating body (4) described later can move up and down.
3) is formed.

[0010] On the other hand, the second vibrating system uses a resilient material similar to the first spring body (1), and a second spring body (2) formed to be deformable in a direction perpendicular to the plane, and a coil (40). The second vibrating body comprising
(4), on the inner peripheral side of the second spring body (2),
The second vibrating body (4) is attached by an adhesive or the like, and the outer peripheral side of the second spring body (2) is attached to the upper case (51) by an adhesive or the like. Thereby, the second vibrating body (4) is connected to the upper case (51).
Can vibrate up and down. The second vibrating body (4) includes a coil (40), a bobbin (41) supporting the coil (40), and a vibrating plate (43) for generating a sound wave. The bobbin (41) has a cylindrical shape and is attached to the second spring body (2), and a coil (40) is wound around the outer periphery of the bobbin (41).
A diaphragm (43) is provided on the upper surface of the bobbin (41). The coil (40) and the bobbin (41) are provided movably in the magnetic gap (33) of the first vibrating body (3).

As described above, the lower case (50) and the upper case (51) provided with the respective vibration systems are connected to each other, and the terminal of the coil (40) is connected.
(42) (42), set the current of the predetermined frequency coil (40)
1 (not shown in FIG. 1). At this time, in the first vibrating body (3), the magnetic circuit in the direction indicated by the arrows in FIGS.
0), upper yoke (31), lower yoke (32) and magnetic gap (33)
The magnetic field in the magnetic gap (33) is directed radially inward. Assuming that the direction of the current flowing through the coil (40) is counterclockwise as viewed from above the device, the interaction between the magnetic field and the current that intersects the magnetic field results in FIG.
As shown in (a), a repulsive force acts between the first vibrating body (3) and the second vibrating body (4). Conversely, if the direction of the current flowing through the coil (40) is reversed, an attractive force acts between the first vibrating body (3) and the second vibrating body (4) as shown in FIG. Therefore, the coil (4
By periodically changing the value of the current flowing through (0),
A periodic electromagnetic force is applied as an external force to the first vibrating body (3) and the second vibrating body (4), and the first vibrating system and the coil (40) are operated by one set of the permanent magnet (30) and the coil (40). Forced vibration can be generated in each of the second vibration systems.
Due to this forced vibration, the first vibration system becomes the first vibration body (3).
To the case (50), (51) or the first spring body
Vibration is transmitted to the cases (50) and (51) by the restoring force of (1), and the device is vibrated, so that notification by vibration can be realized. In addition, due to this forced vibration, the second vibration system becomes a second vibration body.
The diaphragm (43) of (4) vibrates air to generate a sound wave, and the sound wave propagates to the outside through the opening (52) of the upper case (51). If the frequency of the sound wave is in the audible range (about 20 Hz to about 20 kHz), notification by sound can be realized.

In order for a certain vibration system to function effectively as a sound source, it is desirable to vibrate as large as possible at a frequency of 2 to 3 kHz, which is most sensitive to human hearing. Further, the frequency of a vibration generator conventionally used as a vibration source of a device is about 100 Hz. Therefore, for a vibration system to function effectively as a vibration source,
It is desirable to vibrate as large as possible at the front and rear frequencies. Each of the two vibration systems of this embodiment is a single-degree-of-freedom vibration system, and its natural frequency f ₀ is ignored because the viscosity is very small, and the mass of the spring body is smaller than the mass of the vibration body. Is negligible because it is much smaller, and is represented by f ₀ = (1 / 2π) (k / m) ^1/2 . Here, π is the circular constant, k is the spring coefficient of the spring body, and m is the mass of the vibrating body. Therefore, a desired natural frequency can be obtained by appropriately setting the spring coefficient of the spring body and the mass of the vibration body in each vibration system. Hereinafter, the natural frequency f ₀₁ of the first vibration system is set to 3 kHz,
The natural frequency f ₀₂ of the second vibration system is set to 100 Hz, and the first vibration body
Assuming that the masses of (3) and the second vibrating body (4) are substantially equal, the frequency of the current flowing through the coil (40) and the amplitude of each of the first vibrating body (3) and the second vibrating body (4) are Explain the relationship.

When a periodic external force due to a current and a magnetic field is applied to a vibrating body in a one-degree-of-freedom vibration system, the amplitude G
Ignoring the coil inductance, | G | = (KBL) / ｛r ² (km−ω ² ) ² + K ⁴ B ⁴ L ⁴
ω ² ｝ ^1/2 . Here, K is a proportional constant, B is the magnetic flux density in the magnetic gap (33), L is the effective length of the coil (40), r is the DC resistance of the coil (40), and ω is the current through the coil (40). Is the angular frequency (= 2πf) of the current. FIG. 3 is a graph showing the relationship between the amplitude of the vibrating body and the current frequency at this time. Referring to FIG. 3, the amplitude of the vibrating body is much larger in the first vibrating body than in the second vibrating body (4) in the region where the current frequency is about 100 Hz or less, and the difference is about 59 dB. .
When the current frequency is about 100 Hz, the amplitude of the first vibrating body (3) becomes maximum. When the frequency exceeds about 100 Hz, the amplitude of the first vibrating body (3) decreases exponentially. On the other hand, the amplitude of the second vibrating body (4) increases as the frequency approaches about 3 kHz, becomes maximum when the frequency is about 3 kHz, and the first vibrating body (3)
Larger than. Then, when the frequency exceeds about 3 kHz, the amplitude of the second vibrating body (4), like the first vibrating body (3),
It decreases exponentially.

Accordingly, the frequency of the current that the energizing section (6) energizes the coil (40) is set to the natural frequency f ₀₁ ≒ 100H of the first vibration system.
z, or a switching circuit (60) for switching to the natural frequency f ₀₂ ≒ 3 kHz of the second vibration system is connected to the energizing section (6), and the switching circuit
According to (60), when the frequency of the current supplied to the coil (40) by the current supply unit (6) is set to about 100 Hz, the first vibrating body (3) vibrates more than the second vibrating body (4), and is exclusively used. In addition, the notification by the vibration of the device can be realized. The switching circuit (60) causes the current-carrying section (6) to increase the frequency of the current flowing through the coil (40) by about 3 kHz.
When z is set, the second vibrating body (4) vibrates more than the first vibrating body (3), and it is possible to realize notification mainly by generating sound.

When the first vibrator (3) transmits vibration by colliding with the cases (50) and (51), the first vibrator (3)
In order to prevent the case (3) and the cases (50) and (51) from being damaged by the collision, as shown in FIGS. 1 (a) and (b), the collision part of the first vibrating body (3) is cushioned with rubber or the like. It is desirable to provide a material (7). The cushioning material (7) is a case (50)
It may be arranged at the part where the collision occurs in (51).

The description of the above embodiments is for the purpose of illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing the scope thereof. or,
The configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims. For example, in the present embodiment, the shape of each member is circular, and the second vibrating body (4) is located above the first vibrating body (3).
The first vibrating body (3) and the second vibrating body are provided by the magnetic field of the permanent magnet (30) and the current flowing through the coil (40).
The shape and position of each member can be arbitrarily selected as long as (4) is arranged so that the electromagnetic force acts in a vibrable direction. Similarly, the first vibration system may be provided with a diaphragm for generating a sound wave to provide a sound source, and the second vibration system may be provided as a vibration source for transmitting vibration to equipment via the cases (50) and (51). it can. In addition,
It is desirable that the positions of the openings (52) formed in the cases (50) and (51) be near the sound source. Also, as long as the vibration or sound of the device can be sensed by the user, the mass or the spring coefficient of each vibration system can be set arbitrarily. Also, the energizing section
The current generated by (6) is preferably an AC waveform in which the direction of the current changes periodically as shown in FIGS. 2 (a) and 2 (b). However, to forcibly vibrate an object, it is sufficient to apply an external force that periodically changes to the object,
Therefore, as long as the frequency is constant, the current flowing through the coil (40) does not need to have an average current value of zero during one cycle as in the case of an AC waveform.
Any periodically changing waveform such as a sine wave and a triangular wave can be used. Further, in this embodiment, each vibration system is a case (5
0) Although housed in (51), it can also be deployed directly to equipment. That is, the fixing member (5) can be arbitrarily selected as long as it is a member fixed to the device itself or the device.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a notification vibration generating device according to an embodiment, wherein FIG. 1A is an exploded view and FIG. 1B is a vertical end view.

FIGS. 2A and 2B are enlarged views of a main part of FIG. 1B showing an operation in the present embodiment, in which FIG. 2A shows a case where a current flows in one direction of a coil, and FIG. Show when

FIG. 3 is a graph showing an amplitude characteristic of a vibrating body with respect to a frequency of a current flowing through a coil in the embodiment.

4A and 4B are diagrams showing a conventional sound generating device, wherein FIG. 4A is an exploded view and FIG. 4B is a vertical end view.

FIG. 5 is a perspective view showing a conventional vibration generator.

[Explanation of symbols]

 (1) First spring body (2) Second spring body (3) First vibrating body (4) Second vibrating body (5) Fixed member (6) Current-carrying part (30) Permanent magnet (40) Coil

Claims (6)

(57) [Claims] 1. A first vibrating body (3) including a permanent magnet (30) ,
The first spring supported on the fixing member (5) by the first spring body (1)
A second vibrating body (4) including a vibration system and a coil (40) arranged so as to intersect the magnetic flux of the permanent magnet (30) is supported by a fixed member (5) by a second spring body (2). The second vibration system
The comprises the first vibration system, device by transmitting vibration to the fixing member (5)
The second vibration system is used as a vibration source for vibrating
Generates sound waves with frequencies in the audible range and propagates them to the outside
A vibration generator for notification, wherein the vibration generator is used as a sound source . 2. A predetermined predetermined condition which is connected to the coil (40).
It has an energizing part (6) for energizing a frequency current to the coil (40).
The current-carrying part (6) has a frequency of a current flowing through the coil (40).
The substantially matching frequency to the natural frequency f ₀₁ of the first vibration system,
And, notifying vibration generator according to claim 1, switching circuit for switching the frequency substantially coincides with the natural frequency f ₀₂ of the second vibration system is deployed. 3. A first vibrator (3) is characterized in that transmitting vibration to the fixing member (5) by collision, informing the vibration generator according to claim 1 or claim 2. 4. The first vibrating body (3) or the fixing member (5)
The vibration generating device for notification according to claim 3, characterized in that a cushioning material (7) is provided at a portion that collides during vibration. 5. The first vibration system and the second vibration system are open on the upper surface.
Claim: It is accommodated in a fixing member (5) having a mouth (52).
The vibration generating device for notification according to any one of claims 1 to 4.
Place. 6. The first spring body (1) includes a fixing member (5) and a first spring body (1).
Spiral cut between the part fixed to the vibrator (3)
The method according to any one of claims 1 to 5, wherein
Vibration generator for notification.