JP2000295833A - Alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate an alarm sound with enough sound pressure with simple structure, in the case of installing a vibration plate driven by the magnetic circuit within a casing. SOLUTION: A projection 11e projecting into the vibration space of a vibration plate 8 is made inside the casing consisting of a body case 10 and a cover 11. A magnetic circuit is composed of a coil 7 and a magnet 3, and the first signal generating circuit which generates an alarm signal including the signal components of the resonance frequency of the vibration plate 8 and the second signal generating circuit which outputs an acoustic signal are connected capably of switching to a coil 7. The projection 11e projects into such a level that it reaches the vibration space of the vibration plate 8 at the time of the first signal generating circuit being connected to the coil 7 and that it does not reach the vibration space of the vibration plate 8 at the time of the second signal generating circuit being connected to the coil 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a portable telephone has a built-in sound generator (ringer) for notifying an incoming call by sound and a built-in vibration generator for notifying an incoming call by vibration of the telephone body. It is possible to use both depending on the situation. However, a small device such as a mobile phone does not have sufficient space for incorporating both the sound generator and the vibration generator, and there is a problem that the equipment becomes larger due to the provision of both devices. Therefore, the Applicant has proposed FIG. 11 and FIG.
We have proposed a compact sound and vibration generator that combines the functions of a sound generator and a vibration generator, as shown in
(JP-A-10-14194).

The sound / vibration generator includes two vibration systems in a resin casing (110). The casing (110) includes a lower case (110a) supporting the first vibration system,
An upper case (110b) supporting the second vibration system,
A sound outlet (111) is opened in the center of the upper case (110b). The first vibration system includes a first diaphragm (112) and a permanent magnet (11).
3), the first vibrating body (116) is attached to the inner peripheral side of the first vibrating plate (112) by bonding or the like, and the first vibrating plate (112) is attached. ) Is on the outer side of the lower case (11
0a) is attached by bonding or the like. by this,
The first vibration system can vibrate vertically with respect to the lower case (110a). An upper yoke (114) and a lower yoke (115) are provided above and below the permanent magnet (113), respectively, on the first vibrating body (116), thereby forming a magnetic circuit. Permanent magnet (11
3) is magnetized such that the upper surface is an N pole and the lower surface is an S pole. The upper yoke (114) is formed in a ring shape having a vertical wall on the inner periphery, while the lower yoke (115) is formed in a disk shape having a raised portion in the center. A second vibrating body is provided between the vertical wall of the upper yoke (114) and the central ridge of the lower yoke (115).
A magnetic gap (121) is formed so that (117) can move up and down.

On the other hand, the second vibration system includes a second diaphragm (122).
And a second vibrating body (117) having a coil (118). The second vibrating body (117) is attached to the inner peripheral side of the second vibrating plate (122) by bonding or the like. The outer peripheral side of the diaphragm (122) is attached to the upper case (110b) by bonding or the like. Thereby, the second vibration system can vibrate up and down with respect to the upper case (110b). Coil (118) of second vibrator (117)
Is supported on the back surface of the second diaphragm (122) via a cylindrical bobbin (119), and includes a coil (118) and a bobbin (119).
Is provided movably in the magnetic gap (121) of the first vibrating body (116).

The second vibration system has an audible natural frequency (for example, about 2 kHz), whereas the first vibration system has a lower natural frequency (for example, 100 Hz) than the second vibration system.
Degree). Therefore, a driving circuit (not shown) is connected to the pair of free ends (123) (123) of the coil (118),
By supplying a drive signal having the natural frequency of the second vibration system to (118), the second vibration system resonates and emits sound. On the other hand, by supplying a drive signal having the natural frequency of the first vibration system to the coil (118), the first
The vibration system resonates, and a sensible vibration is emitted.

[0006]

However, in a small alarm device such as the above-mentioned sound / vibration generating device, since a large number of members are arranged in a small casing, dimensions and voltage specifications of each member are limited. As a result, there is a problem that it is difficult to generate a notification sound (ringer sound) having a sufficient sound pressure.

An object of the present invention is to provide an alarm device which can generate an alarm sound with a sufficient sound pressure with a simple configuration.

[0008]

An alarm device according to the present invention comprises:
A vibration plate (8) that is driven by a magnetic circuit and vibrates is installed in the casing, and the vibration of the vibration plate (8) causes
A sound is generated toward the outside of the casing, and a protrusion (11e) projecting into the vibration space of the diaphragm (8) is formed on the inner surface of the casing.

In the notification device of the present invention, when the diaphragm (8) is driven by the magnetic circuit, audible sound is generated by the vibration of the diaphragm (8), and the diaphragm (8) is raised by the protrusion of the casing. The impact collides with the portion (11e), and the impact at this time generates a sound with a large sound pressure from the diaphragm (8). or,
The casing also vibrates under the impact force and generates sound. As a result, a notification sound with a larger sound pressure than before is generated.

In a specific configuration, when the magnetic circuit is stopped, the convex portion (11e) of the casing is formed at a height that comes into contact with the stationary diaphragm (8). In the specific configuration,
When the diaphragm (8) is in contact with the convex portion (11e) of the casing, by separating and colliding repeatedly, an alarm sound is generated.

In another specific configuration, when the magnetic circuit is stopped, the convex portion (11e) of the casing is brought into a stationary state with the diaphragm.
It is formed at a height separated by a predetermined distance from (8). In the specific configuration, the diaphragm (8) is provided with the convex portion (1) of the casing.
An alarm sound is generated by repeating collision and separation from the state separated from 1e).

In a more specific configuration, the magnetic circuit includes a coil (7) fixed to a diaphragm (8),
(7) and a magnet (3) to be linked to the lines of magnetic force. The coil (7) has a resonance frequency f1 of the diaphragm (8).
A first signal generation circuit for generating an annunciation signal including a signal component of the above and a second signal generation circuit for outputting an audio signal are switchably connected by a selection means, and the projection (11e) is provided with a coil (7) When the first signal generation circuit is connected to the diaphragm
It reaches the vibration space of (8) and protrudes to a height that does not reach the vibration space of the diaphragm (8) when the second signal generation circuit is connected to the coil (7).

In this specific configuration, by switching the selection means, the first signal generating circuit is connected to the coil (7), whereby a notification signal is supplied to the coil (7), and the diaphragm (8) is turned on. It is driven at the resonance frequency f1. As a result, the diaphragm (8) resonates, generating a large sound (information sound). Further, the diaphragm (8) repeatedly collides with the convex portion (11e) of the casing with a large amplitude due to resonance,
Due to the impact at this time, a sound with a large sound pressure is generated.
On the other hand, by switching the selection means, the second signal generation circuit is connected to the coil (7), whereby an audio signal is supplied to the coil (7) and the diaphragm (8) is driven. As a result, the diaphragm (8) vibrates, and a sound is emitted. At this time, the amplitude of the diaphragm (8) is small, and the diaphragm (8) does not collide with the projection (11e) of the casing. Therefore, no noise is added to the voice.

More specifically, the second signal generation circuit includes a filter for suppressing and outputting a signal component of frequency f1 included in the audio signal. Therefore, the signal component of the frequency f1 included in the audio signal is not greatly amplified by the resonance of the diaphragm (8), and a change in sound quality due to the resonance is prevented.

[0015]

According to the notification device of the present invention, a notification sound having a large sound pressure can be generated by a simple configuration in which only the convex portion (11e) is formed on the casing.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a sound / vibration generating apparatus for a portable telephone will be specifically described with reference to the drawings. As shown in FIG. 8, the mobile phone of the present invention has a small casing (101) having an antenna (100) protruding therefrom.
A display (102), an operation button (103), and a transmission section (104) are provided on the surface of the casing, and a sound / vibration generator (20) of the present invention is provided inside the casing (101). Thus, the receiver section is constituted. Also, inside the casing (101),
The circuit shown in FIG. 9 is provided. The configuration of the circuit will be described later.

As shown in FIG. 1, in a sound / vibration generator (20) of the present invention, a resin-made body case (10) having a cylindrical shape with both ends opened, and an upper opening of the body case (10) are provided. A flat casing is constituted by a disc-shaped resin cover (11) attached to the main body and a disc-shaped metal bottom plate (12) attached to the lower opening of the main body case (10). A sound generating unit (9) having an audible band natural frequency (for example, 2.5 kHz) in the casing and driven by the natural frequency to generate sound;
A natural frequency lower than the natural frequency of (9) (for example, 130
(Hz), and a vibration generating unit (6) driven at the natural frequency to vibrate the casing.
In addition, a holder (10i) is integrally formed at an end of the main body case (10), and the holder (10i) is attached to the sound generating unit.
A pair of relay terminals (13) and (14) to which a drive signal for driving the (9) and / or the vibration generating unit (6) is to be input is attached.

A more specific structure of the sound / vibration generator (20) will be described in detail together with its assembly process. FIG.
Represents the structure of the vibration generating unit (6), and a lower yoke (2) made of pure iron is adhesively fixed to the ring-shaped first diaphragm (1) at a concentric position. Here, a convex portion (2) projecting from the center opening (1a) of the first diaphragm (1) and the back surface of the lower yoke (2) is provided.
By a) and a) being fitted together, accurate positioning is achieved. Next, a disk-shaped magnet (3) monopolarly magnetized in the axial direction is fixed at a concentric position on the bottom surface (2b) of the lower yoke (2). The fixing is performed only by the attractive force of the magnet (3), and the concentric position can be determined by using a jig (not shown). Further, a disc-shaped upper yoke (4) made of pure iron is positioned on the upper surface of the magnet (3) in the same concentric position by using a jig, and is fixed by the attractive force of the magnet (3). You.

Finally, a ring-shaped weight piece (5) made of a material having a large specific gravity, such as tungsten, is fitted on the outer peripheral surface (2c) of the lower yoke (2) and is fixed by bonding. Here, as the adhesive, it is appropriate to use an acrylic anaerobic adhesive that is cured by ultraviolet light and heat in terms of assemblability and heat resistance against heat during reflow. Thus, the vibration generating unit (6) is configured.

The first diaphragm (1) is a leaf spring made of stainless steel having an outer diameter of about 14 mm and a thickness of about 0.12 mm. As shown in FIG. Convex part (2a)
Encircles a central opening (1a) with a diameter of about 8 mm to be fitted, and has three spiral springs (1b) (1c) with a band width of about 3 mm
(1d) is formed. Therefore, as shown in FIG. 4, the outer peripheral portion (1e) where the first diaphragm (1) should be sandwiched between the main body case (10) and the lower yoke (2), the magnet
(3) The upper yoke (4) and the weight piece (5) vibrate in the axial direction as an integrated magnet device.

FIG. 5 shows the structure of the sound generating unit (9), and one end face of a coil (7) wound in a cylindrical shape.
In (7a), the second diaphragm (8) is positioned at a concentric position by a jig (not shown), and is adhesively fixed. Where the coil
A pair of free ends (7b) and (7b) of (7) penetrate through a long hole (8a) formed in the second diaphragm (8), and the tip ends thereof are the second diaphragm (8).
Protruding from the surface (8b) of The second diaphragm (8) has a diameter of 1
A stainless steel leaf spring having a thickness of about 4 mm and a thickness of about 0.04 mm, and an outer peripheral portion (8c) to be sandwiched between the main body case (10) and the cover (11) is a fixed end, Central part (8
d) vibrates in the axial direction.

Next, referring to FIG. 6, a more specific structure of the main body case (10) and the cover (11) and a sound generation unit will be described.
The structure for mounting (9) to the main body case (10) will be described. The main body case (10) is made of a heat-resistant resin, such as PPS, LCP, which withstands the temperature during reflow. Since these resin materials have lower adhesiveness than metal, a curing accelerator is applied to the body case (10) in advance.

On the inner surface of the cover (11), a ring-shaped projection (11e) projecting into the vibration space of the second diaphragm (8) is integrally formed (see FIG. 1). When the operation of the sound generation unit (9) is stopped, the projection (11e) is separated from the stationary diaphragm (8) by a predetermined distance d (for example, several tens of μm) as shown in FIG.

As shown in FIG. 6, the outer peripheral portion (8c) of the second diaphragm (8) is in surface contact with the inner peripheral step (10a) of the main body case (10), and is fixed by bonding. Here, the second diaphragm (8)
The protruding piece (8e) of the second diaphragm (8) is fitted in the notch (10b) of the case to position the second diaphragm (8) in the circumferential direction.
By fitting f) with the inner peripheral surface (10c) of the main body case (10), the second diaphragm (8) is positioned concentrically with the main body case (10). The free ends (7b) and (7b) of the coil (7) are bent toward the notches (10b) of the main body case (10) as shown by the chain lines.

Thereafter, a cover (11) molded of a resin such as PPS or LCP covers the upper surface of the second diaphragm (8) and is fixed to the main body case (10). Where the cover (11)
The protrusion (11a) of the main body case (10) fits with the notch (10b),
The cover (11) is positioned in the circumferential direction, and the outer peripheral surface (1
1b) is fitted into the inner peripheral surface (10c) of the main body case (10) in a light press-fit state, is positioned at a concentric position, and is adhesively fixed. The adhesive can be initially cured within a few minutes by the action of the curing accelerator. The cover (11) has the cross-sectional shape shown in FIG. 1, and the lower peripheral portion (11d) is in surface contact with the upper peripheral portion (8g) of the second diaphragm (8). ) Inner circumference step
(10a), the outer peripheral portion of the second diaphragm (8) is sandwiched.

The positional relationship between the components of the sound / vibration generator (20) is as shown in FIG.
Since it is located in a magnetic gap (magnetic field) formed between the inner peripheral surface (2d) of the lower yoke (2) and the outer peripheral surface of the upper yoke (4), by supplying an alternating current to the coil (7), An alternating electromagnetic force in the axial direction is generated. Here, by passing an alternating current having a frequency corresponding to the natural frequency (about 130 Hz) of the vibration generating unit (6), the vibration generating unit (6) vibrates in the axial direction, vibrates the casing, and receives an incoming call. Notify. or,
When an alternating current having a frequency corresponding to the natural frequency (approximately 2.5 kHz) of the sound generating unit (9) flows, the sound generating unit (9) vibrates in the axial direction, and the sound emission port of the cover (11).
A sound is emitted from (11c) to notify an incoming call.

The circuit shown in FIG. 9 is connected to the sound / vibration generator (20). In the circuit, the analog audio signal input from the microphone for transmission (108) is converted into a digital audio signal by the audio processing circuit (111), and then processed by the signal processing circuit (112). After being subjected to frequency conversion and modulation by the circuit (113), the signal is transmitted from the antenna (100) at a predetermined transmission output. On the other hand, the signal received by the antenna (100) is subjected to frequency conversion and demodulation by the radio circuit (113), and a digital audio signal is extracted by the signal processing circuit (112). After being converted into an analog audio signal by the audio signal processing circuit (111), the signal is passed through the filter circuit (114) and the three terminals a, b,
The voltage is applied to the terminal a of the switch means 115 having c.
The filter circuit (114) is composed of a low-pass filter, and cuts a frequency component near the resonance frequency f1 of the second diaphragm (8).

The signal processing circuit (112) is connected to an incoming call detection circuit (116) for detecting a call to the own station, and an incoming call detection signal is supplied to a control circuit (120). Operation buttons (10
According to 3), a call setting means (117) for setting whether notification at the time of an incoming call is made by sound or by vibration is configured, and the setting signal is supplied to the control circuit (120). Switch means
The first signal generating means (118) is connected to the terminal b of (115),
A second signal generating means (119) is connected to the terminal c,
The control circuit (120) switches the switch means (115) to the terminal b or the terminal c when an incoming call is detected.

The first signal generated by the first signal generating means (118) is a rectangular wave having a frequency of 130 Hz, and is set to a frequency equal to the natural frequency of the vibration generating unit (6). Therefore, the vibration generating unit (6) can be resonated by switching the switch means (115) to the terminal "b" and supplying the signal to the sound / vibration generator (20) via the first signal.

On the other hand, the second signal generated by the second signal generating means (119) includes a 2.5 kHz signal at a constant period. Accordingly, by switching the switch means (115) to the terminal c and supplying the second signal to the sound / vibration generating device (20), the sound generating unit (9) can resonate and generate a ringer sound. I can do it. Here, since the voltage of the second signal is sufficiently high at about 3 V, the second diaphragm (8) includes:
As shown by the broken line in FIG. 7, a large amplitude is generated due to resonance, and as shown by the broken line in FIG. 7, the second diaphragm (8 ') is covered by the cover (1).
The collision will be repeated for the convex portion (11e) of 1). Due to the impact at this time, loud sound is generated from the second diaphragm (8), and vibration is also generated in the cover (11), so that sound is generated. As a result, an incoming notification sound having a large sound pressure is obtained.

The control circuit (120) switches the switch means (115) to the terminal a in response to the off-hook operation, and converts the audio signal supplied from the audio processing circuit (111) into the filter (114) and the switch means (115). ), Sound and vibration generator (20)
Supply to Thereby, the sound generation unit (9) vibrates, and the sound generation unit (9) becomes a receiving speaker,
Voice (received sound) will be emitted. Here, the audio signal supplied from the audio processing circuit (111) has an amplitude of 100
It has a frequency band of about 300 Hz to 3 kHz at about mV and includes the resonance frequency of the sound generating unit (9).
Since the signal component having the frequency of z is suppressed, no resonance due to the vibration component occurs in the second diaphragm (8). Accordingly, there is no change in the sound quality of the received sound.

Since the amplitude of the voice signal is as low as about 100 mV, the amplitude of the second diaphragm (8) at this time is sufficiently smaller than the amplitude at the time of the notification of the incoming call, as shown by a chain line in FIG. The second diaphragm (8 ") does not collide with the projection (11e) of the cover (11), so that no noise is generated by the collision.

Next, a safety mechanism against an impact force when the sound / vibration generator (20) is dropped will be described. As shown in FIG. 3, since the first diaphragm (1) has a spiral spring structure for generating a large amplitude, it cannot be said that the first diaphragm (1) has sufficient strength against an impact force. Therefore, in this embodiment, stoppers are provided on the upper and lower sides of the vibration generating unit (6) to restrict the displacement of the vibration generating unit (6), thereby ensuring the safety of the components.

That is, as shown in FIG. 1, an upper stopper (10h) for projecting an upper limit of the displacement of the vibration generating unit (6) is provided on the inner peripheral surface of the main body case (10). Therefore,
When the vibration generating unit (6) is excessively displaced upward due to the impact force, during the displacement, the outer peripheral step (5a) of the weight piece (5) hits the upper stopper (10h). Contact and further displacement is prevented. Therefore, not only the first diaphragm (1) itself is not damaged by excessive displacement, but also the upper yoke (4), the lower yoke (2) or the weight piece (5) is
Direct collision with the diaphragm (8) is prevented, and damage to the second diaphragm (8) is also prevented. Furthermore, the end face of the coil (7)
Since the collision between (7c) and the bottom surface (2b) of the lower yoke (2) is prevented, the coil (7) is not damaged.

In addition, a lower stopper (12f) having a slight step is protruded from the center of the bottom surface of the bottom plate (12). When the vibration generating unit (6) is excessively displaced downward, the projection (2a) of the lower yoke (2) comes into contact with the lower stopper (12f) during the displacement, and further displacement occurs. Will be blocked. Therefore, the first diaphragm (1) is not damaged by excessive displacement.

The configuration of each part of the present invention is not limited to the above embodiment, and various modifications can be made within the technical scope described in the claims. For example, as shown in FIG. 10, a convex portion (10j) with which the second diaphragm (8) collides when an incoming call is notified may be provided on the upper stopper (10h) of the main body case (10).
When the sound / vibration generating device (20) is not used as a receiving speaker, the projections (11e) and (10j) may be formed at a height that comes into contact with the stationary second diaphragm (8). It is possible.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sound / vibration generator according to the present invention.

FIG. 2 is an exploded perspective view of a vibration generating unit provided in the sound / vibration generating device.

FIG. 3 is a perspective view of a first diaphragm.

FIG. 4 is a perspective view of a vibration generating unit.

FIG. 5 is an exploded perspective view of the sound generation unit.

FIG. 6 is an exploded perspective view of a cover, a sound generation unit, and a main body case.

FIG. 7 is an enlarged sectional view showing a main part of the sound / vibration generator according to the present invention.

FIG. 8 is a perspective view of a mobile phone to which the present invention is to be applied.

FIG. 9 is a block diagram illustrating a circuit configuration of a mobile phone.

FIG. 10 is a sectional view showing another configuration example of the sound / vibration generator according to the present invention.

FIG. 11 is a sectional view of a conventional sound / vibration generator.

FIG. 12 is an exploded perspective view of the sound / vibration generator.

[Explanation of symbols]

 (20) Sound / vibration generator (10) Body case (11) Cover (11e) Convex part (12) Bottom plate (6) Vibration generating unit (1) First diaphragm (2) Lower yoke (3) Magnet (4) ) Upper yoke (5) Weight piece (9) Sound generation unit (7) Coil (8) Second diaphragm

Claims (5)

[Claims] 1. A notifying device in which a vibration plate (8) that is driven by a magnetic circuit and vibrates is installed in a casing, and the vibration of the vibration plate (8) generates sound toward the outside of the casing. The inner surface of the casing has a diaphragm
(8) A notifying device characterized in that a projection (11e) projecting into the vibration space is formed. 2. The alarm device according to claim 1, wherein the projection (11e) of the casing has a height that comes into contact with the diaphragm (8) when the casing is not driven. 3. The alarm device according to claim 1, wherein the projection (11e) of the casing has a height that is separated from the diaphragm (8) when not driven by a predetermined distance. 4. The magnetic circuit comprises: a coil (7) fixed to a diaphragm (8); and a magnet (3) for linking lines of magnetic force to the coil (7). A first signal generation circuit for generating a notification signal including a signal component having a resonance frequency f1 of the diaphragm (8), and a second signal generation circuit for outputting an audio signal.
The signal generating circuit is switchably connected to the signal generating circuit by the selection means, and the protrusion (11e) reaches the vibration space of the diaphragm (8) when the first signal generating circuit is connected to the coil (7), and The notification device according to claim 3, wherein the notification device has a height that does not reach the vibration space of the diaphragm (8) when the second signal generation circuit is connected to the coil (7). 5. The notification device according to claim 4, wherein the second signal generation circuit includes a filter that suppresses and outputs a signal component of frequency f1 included in the audio signal.