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JP2003273965

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DESCRIPTION JP2003273965
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electro-acoustic transducer suitable for use in a portable telephone apparatus and an electrovibration transducer, and in particular, the sensation of a vibrator etc. which doubles as a
magnetic circuit of an electro-acoustic transducer such as a handset. The present invention
relates to an electric vibration conversion means for vibration, an electroacoustic conversion
device, and a portable telephone device.
[0002]
2. Description of the Related Art Conventionally, as a service function of a portable telephone
apparatus, a PB (push button) signal sound and various synthetic sounds are emitted as a ring
tone at the time of calling, or an LCD ( Liquid crystal display devices are used to display various
status modes for displaying messages. In the manner mode, etc., PB signal at the time of an
incoming call is vibrated so as not to bother the surroundings, the casing of the portable
telephone device is vibrated to prevent the emission of music, and a calling vibration mode to
notify an incoming call is widely performed. There is.
[0003]
As a specific configuration for realizing the above-mentioned ringing vibration mode, for
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example, as shown in FIG. 8, the motor 1 is fixed to the inside of a portable telephone device, and
a disk-like weight is attached to the tip of the shaft 2 of the motor 1 3 is fitted. In this case, the
fitting position of the shaft 2 of the motor 1 is fixed at a position eccentric to the disk center O of
the disk-like weight 3.
[0004]
Therefore, by rotating the motor 1 around the shaft 2 at high speed as shown by arrow A, the
eccentric weight 3 rotates at high speed to generate eccentric vibration to vibrate the housing of
the portable telephone device. The vibrator which can do is obtained.
[0005]
In addition, in order to emit PB sound and the like, an electroacoustic conversion means such as a
receiver is provided separately from the above-described vibrator in the portable telephone
device.
[0006]
The electro-acoustic conversion means used in the present invention includes a receiver and a
receiver for converting electric energy such as acoustic signal into sound energy such as voice or
musical instrument, and conversely converts sound energy into electric energy, and includes
electric vibration The conversion means is a conversion means for converting electrical energy
into mechanical energy such as vibration.
[0007]
SUMMARY OF THE INVENTION As described above, the conventional portable telephone
apparatus requires a receiver for emitting a PB sound to notify of an incoming call and a drive
circuit for driving the receiver, and a sensational vibration to notify the incoming call. These two
members occupy a large proportion in the small-sized portable telephone apparatus housing,
since the electric vibration conversion means for generating the electric vibration conversion
means and the drive circuit for driving the electric vibration conversion means are independently
required. There is a problem that manufacturing cost is high and it is difficult to reduce the size
and weight.
[0008]
In addition, there is a problem that a speaker used for a portable telephone apparatus or the like
is small and has a small diaphragm area, so that the efficiency of the bass region is poor, a
sufficient sound pressure level can not be obtained, and the bass region runs short.
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[0009]
Furthermore, since the balance of the weight of the motor constituting the electric vibration
conversion means is made uneven to generate the vibration, the sensational vibration is not
pleasant because it vibrates regardless of the rhythm of the music.
[0010]
The present invention has been made to solve the above-mentioned problems, and the problem
to be solved by the present invention is to reproduce the ringing signal at the time of arrival with
an acoustic signal and to generate a sensational vibration corresponding to the acoustic signal.
To provide a compact, lightweight and inexpensive mobile telephone device, an electroacoustic
transducer, and an electric vibration transducer.
[0011]
In the first aspect of the present invention, an electro-acoustic conversion means such as a
transmitter or a receiver built in a portable telephone apparatus is also used as an electric
vibration conversion means to generate a sensational vibration. The portable telephone device of
[0012]
The portable telephone apparatus according to the second aspect of the present invention is of
an electrodynamic type having at least a magnet in the electroacoustic conversion means, and
the electric vibration conversion means supplies a current to an inductance which crosses in a
leakage flux from the magnet. It is made to generate a sensation vibration.
[0013]
According to a first aspect of the present invention, the electroacoustic transducer is used as the
electroacoustic transducer.
[0014]
According to a second aspect of the present invention, the electroacoustic transducer is a
motorized type having a magnetic circuit including at least a magnet, and the vibrating coil
crosses the leakage flux from the magnet of the magnetic circuit, and the electroacoustic
transducer is a vibrating coil. And an elastic holding means for swingably holding the electric
vibration converting means, and supplying an electric current to the vibration coil to vibrate the
electric vibration converting means.
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[0015]
The electro-acoustic transducer according to the third aspect of the present invention comprises
acoustic signals supplied to the vibration coil of the electro-vibration transducer means through
low-pass filtering means or band-pass filtering means for bodily sensation vibration.
[0016]
The electro-acoustic transducer according to the fourth aspect of the present invention
comprises high-pass filtering means for supplying medium to high frequency acoustic signals to
the voice coil of the electro-acoustic transducer means, and low-pass filtering means or bandpass filtering means for acoustic signals. It comprises: low-pass or band-pass filtering means for
supplying to the vibrating coil; selection means for selectively providing an acoustic signal to the
high-pass filtering means and the low-pass or band-pass filtering means; In response to this, it is
configured to switch whether the electro-acoustic conversion means is made to emit sound or the
electro-vibration conversion means is made to physically vibrate via the elastic holding means.
[0017]
The electro-acoustic transducer according to the fifth aspect of the present invention pivotally
connects the electro-acoustic transducer having the vibrating coil to the electro-acoustic
transducer, and supplies an audio signal to the drive coil through the band-pass filter. In the
electro-acoustic transducer in which the electrical vibration converting means is made to
physically vibrate, the resonance frequency of the band pass filtering means and the resonant
frequency of the elastic holding means are combined.
[0018]
The electric vibration converter according to the first aspect of the present invention is
configured by generating a sensational vibration by configuring the electric vibration converter
using a magnetic circuit including a magnet of the electric acoustic converter.
[0019]
According to the portable telephone device, the electroacoustic transducer and the electric
vibration transducer of the present invention, when a voice signal is reproduced by a small
speaker, the bass area has a small diaphragm area, so the conversion efficiency is poor, and Since
it is not possible to lower the lowest resonance frequency of the speaker unit, it is difficult to
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obtain a sufficient sound pressure level.
Therefore, by making the body not only sound pressure but sound as vibration, it is possible to
enjoy music with a wide range of efficient bass range.
When used in a portable telephone device, the function of the vibrator as a functional body
feeling vibration generator as a speaker can be operated by one unit.
[0020]
When voice and vibration are to be generated in one unit, the speaker that generates the voice is
an electrodynamic type having a magnet, and by using the leakage flux of this magnet, wasteful
magnetic energy is effectively converted into vibration energy. can do.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a portable telephone
device, an electroacoustic transducer (hereinafter referred to as a speaker) and an electric
vibration transducer (hereinafter referred to as a vibrator) according to the present invention will
be described in detail with reference to FIGS. Write down.
[0022]
FIG. 1 is a system diagram showing the general configuration of a portable telephone apparatus
showing one embodiment of the present invention, and FIG. 2 is a side sectional view showing
the construction of a speaker and a vibrator used in the portable telephone apparatus.
[0023]
FIG. 1 shows a system diagram of a PHS (personal headphone system) type portable telephone
apparatus (hereinafter referred to as a terminal apparatus) 16. This terminal apparatus 16
mainly comprises an antenna unit 1 and an RF (radio frequency) unit. 2, demodulation unit 3,
modulation unit 4, TDMA / TDD (Time Division Multiple Access / Time Division Deplexer)
processing unit 5, audio codec such as ADPCM (Adaptive Differential PCM) It includes a voice
processing unit 6 including, a speaker 7 constituting a handset, a microphone 8 and a vibrator 9
which doubles as a magnetic circuit of the speaker 7 and gives a sensational vibration upon an
incoming call.
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[0024]
The TDMA / TDD processing unit 5 and the voice processing unit 6 are controlled by a
microcomputer (CPU) 12 including a normal RAM (random access memory) 10 and a ROM (read
only memory) 11, and the bus line of the CPU 12 An operation key 13 and a display 14 such as
an LCD (Liquid Crystal Display) are connected, and further, the RF unit 2 is connected to the CPU
12 via the quality management unit 15 to perform quality control of transmission and reception
signals.
[0025]
A side sectional view of a speaker used for the above-mentioned terminal device 16 is shown in
FIG.
In FIG. 2, the terminal device 16 is an electrodynamic type facing the sound emission hole 18
formed in the case 17 which is formed as a folded type, a flip type or the like in addition to a
normal flat rectangular orthodox shape. Speaker 7 is fixed.
Further, the vibrator 9 driven by the leakage flux 21 from the magnet 20 of the speaker 7 is held
swingably with respect to the speaker 7.
[0026]
In FIG. 2, the speaker 7 is of an electrodynamic type, and has a center pole 23 formed by forging
at the center position of a metallic substantially disk-shaped lower yoke 22 and has an inverted
T-shaped cross section. A substantially concentric flat magnet 20 such as a ferrite magnet or a
samarium-cobalt magnet is placed and fixed on a yoke in which the lower yoke 22 and the center
pole 23 are integrated.
[0027]
The magnet 20 has its upper and lower surfaces magnetized, for example, to an S pole and an N
pole.
[0028]
A concentric upper yoke 24 made of the same metal as that of the lower yoke 22 is joined to the
lower side of the flat concentric magnet by an adhesive or the like to form the magnetic circuit
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25 of the speaker 7.
[0029]
In a gap formed between the outer diameter of the center pole 23 and the inner diameter of the
upper yoke 24, a voice coil 26 in which a bobbin 27 is wound is swingably held by a frame 29
via a damper 28.
[0030]
A funnel-shaped metal frame 29 is fixed on the upper yoke 24, and the diaphragm 30 formed of
a funnel-shaped or dome-shaped paper, a synthetic resin film, an aluminum foil, a titanium foil,
etc. By fixing the diameter and the outer periphery of the frame 29 via the edge 31, the acoustic
signal is emitted from the diaphragm 30 of the speaker 7 based on the acoustic signal flowed to
the voice coil 26 in the effective magnetic flux 32 in the gap. Be done.
[0031]
On the other hand, in the present invention, a sensational vibration is generated in the leakage
flux 21 which reaches the upper yoke 24 through the space from the N pole of the magnet 20 of
the magnetic circuit 25 of the electrodynamic speaker 7 through the lower yoke 22. A holder in
which a material such as nonmagnetic material or ABS (acrolytril, butadiene styrene) resin is
formed in a cylindrical shape with a bottom to arrange the vibration coil 33 for the purpose, and
the vibration coil 33 is wound on the upper side of the cylindrical portion 34 is held at the lower
surface center position of the lower yoke 22 via the damper 35.
[0032]
A coiled spring 36 is interposed between the bottom of the holder 34 and the case 17 of the
terminal device 16 so as to transmit the vibration of the vibrating coil 33 to the case 17.
Also, the same effect can be obtained by using a structurally simple leaf spring instead of the
coiled spring 36.
[0033]
The damper 35 for holding the holder 34 at the bottom of the lower yoke 22 is formed in a
substantially disk shape, and the waveform damper 35 is formed concentrically around the outer
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periphery of the disk, and the central portion is joined to the bottom of the lower yoke 21 with
an adhesive or the like. The outer periphery of the damper 35 is joined and held at the lower end
of the inner surface of the cylinder near the bottom of the holder 34 to constitute the vibrator 9.
[0034]
The effective magnetic flux in the case of emitting an acoustic signal 37 such as a PB signal or a
synthesized voice or synthesized sound in the memory as the speaker 7 by the vibrator 9 also
used as the speaker 7 of the above configuration is relatively inefficient and the magnet 20 has
The remaining magnetic flux is about 40% of the total magnetic flux, and the remaining 60% is
the leaked magnetic flux 21 which shorts the magnet 20. Therefore, a magnetomotive force
capable of sufficiently driving the vibrating coil 33 can be obtained by the leaked magnetic flux
21.
In this case, since the leakage flux 21 in which the vibrating coil 33 is disposed is distributed
widely on the outside of the magnet 20 compared to the effective flux 32 in the gap, a large (turn
number, diameter, etc.) coil is generated in this magnetic field Although it is necessary to wind
the coil, if the shape of the vibrating coil is flattened, sufficient driving force can be obtained.
[0035]
Further, in a speaker or the like for obtaining a predetermined sound pressure in general, there is
a restriction on the impedance (generally 8 Ω) of the voice coil 26 and a mass restriction such as
raising the mass of the diaphragm to emit low tones. In the vibrating coil used for the vibrator 9,
there is no limitation described above, and even if the number of turns of the vibrating coil 33 is
increased even with a minute current, sufficient vibration can be obtained (Driving force = flux
density × coil length).
[0036]
Circuit configurations for driving the above-described speaker 7 and vibrator 9 will be described
with reference to FIGS. 3 to 7.
[0037]
FIG. 3 is a system diagram of an embodiment of the present invention, FIG. 4 is a system diagram
of another embodiment of the present invention, FIG. 5 is a system diagram of another
embodiment of the present invention (I), and FIG. FIG. 7 is a system diagram (II) of still another
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embodiment of the present invention, and FIG. 7 is an equivalent circuit for explaining a
resonance frequency.
[0038]
In FIG. 1, an acoustic signal 37 such as PB sound at the time of an incoming call or
conversational sound is supplied to the voice coil 26 of the speaker 7 through a driving amplifier
circuit (AMP) 38 for driving the speaker 7.
[0039]
Further, the acoustic signal supplied to the AMP 38 is branched and supplied to the low pass
filtering circuit (LPF) 39, and only the low band signal component is allowed to pass to drive the
vibrating coil 33 constituting the vibrator 9 to drive the amplifying circuit 40. Supplied to
[0040]
FIG. 5 shows the case where the LPF 39 of FIG. 3 is changed to a band pass filtering circuit (BPF)
43, and FIG. 6 shows a drive coil 33 with the BPF 43 'in which the resonance frequency of the
vibrator 9 is matched with the resonance frequency of the BPF 43 shown in FIG. 4 shows a case
in which the mid-high range is driven by the speaker 7 via the switching switch 42 and the high
pass filtering circuit (HPF) 41 and the vibrating coil 33 via the switching switch 42 and the LPF
39. Shows a configuration in the case of switching control of the case of driving the low band of.
[0041]
The operation will be described below in each of the above-described system diagrams.
First, when the contact piece a of the changeover switch 42 is manually switched to the fixed
contact c side in FIG. 3 and FIG. 4, the LPF 39 filters the low band signal in the acoustic signal 37
and the vibrating coil 33 of the vibrator 9 via the AMP 40. The low frequency signal crosses the
leakage magnetic flux 21 to generate a driving force F which vertically swings the holder 34 as
shown in FIG.
Assuming that B is a magnetic flux density of the leaked magnetic flux 32, I is a current flowing
through the vibrating coil 33, and L is an inductance length of the vibrating coil 33, a driving
force represented by F = BLI is obtained.
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[0042]
In this case, since the vibration coil 33 is integral with the holder 34 and the holder 34 is held at
the center of the lower yoke 22 by the damper 35, contact with the outer peripheral portion of
the magnet 20 does not occur Absent.
[0043]
The vibration due to the up and down rocking can be transmitted to the case 17 of the terminal
device 16 through the spring 36 to allow the holder of the terminal device 16 to experience the
vibration.
[0044]
In the configuration of FIG. 3, since the acoustic signal 37 is supplied to the voice coil 26 of the
speaker 7 via the AMP 38, a predetermined acoustic signal 37 is emitted from the diaphragm 30
of the speaker 7 together with low frequency vibration.
[0045]
In the case of FIG. 4, according to the operation of switching the contact piece a of the
changeover switch 42 to the fixed contact b side, only the speaker 7 is emitted in the path of HPF
41 → AMP 38 → voice coil 26 or the fixed contact of the contact a According to the switching
operation to the c side, it is possible to select whether only the vibrator is vibrated in the path of
LPF 39 → AMP 40 → vibrating coil 33, and the switch 42 is automatically operated by the
operation of the operation key 13 and the CPU 12 (see FIG. 1) It is also possible to make it
switch.
[0046]
In the case of FIG. 5, the vibration coil 33 of the vibrator 9 is driven via the BPF 43.
In this case, in the BPF 43, the resonance frequency of the BPF 43 is selected as the vibration of
the frequency at which the owner of the terminal device is most easily experienced.
[0047]
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In the case of FIG. 6, the combined mass MC + MH of the vibrating coil 33 and holder 34
constituting the vibrator 9 shown in FIG. 2 causes a resonance due to the combined compliance
of the damper 35 and the spring 36, and this resonance frequency is most easily felt. To match
the frequency of
[0048]
FIGS. 7A and 7B show equivalent circuits of the resonance frequency f0 of the vibrating coil of
the vibrator 9. FIG.
Here, MH is the equivalent mass of the holder 34, MC is the equivalent mass of the vibrating coil
33, C1 is the compliance of the damper 35, C2 is the compliance of the spring 36 and these
equivalent masses MH and MC with respect to the driving force F and the compliance C1 and C2
is connected in series.
[0049]
Now, if compliances C1 and C2 are replaced with stiffness, then C1 = 1 / K1 C2 = 1 / K2 (1) Now,
MH + MC = M, K1 << K2 and Fig. 7 (A) corresponds to Fig. 7 (B) Is replaced by the equivalent
circuit of
Therefore, the resonant frequency f0 of the vibrating coil 33 is determined by the stiffness of the
spring 36 and the mass of the vibrating coil 33 and the holder 34, so that the resonant frequency
f0 can be adjusted to an arbitrary resonant frequency value most easily felt.
[0050]
Further, the amplitude A of the vibrating coil 33 is A = F / ZM (3) where ZM is a mechanical
impedance, ZM = ωM−1 / ωC, F = B2 · L · IB2 is a magnetic flux density, and L is a vibrating
coil A length of 33, L is a current.
It is determined by
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In the case of the speaker 7, the amplitude A of the vibration of the bass is several millimeters,
but in the case of the vibrating coil 33, the amplitude A may be 1/10 or less and the required
power can be reduced.
[0051]
In the above description, the case where the speaker 7 and the vibrator 9 are built in the mobile
telephone device 16 has been described, but the speaker and the vibrator of the present
invention are portable radio cassettes or PDAs (Personal Digital Assistants) and mobile
information It is obvious that the tool may be incorporated in the case of the electronic organizer.
[0052]
According to the present invention, when an acoustic signal is supplied to a speaker, a low
frequency band signal or a frequency signal of maximum sensation is extracted to drive a
vibrating coil of a vibrator separately from an acoustic signal for driving the speaker, Since the
vibrator is vibrated with the low frequency component or the band component of the same signal
as the sound signal for driving the speaker, the speaker and vibrator can be driven by one driving
source, and the rhythm matching the music can be comfortably felt. It is possible to obtain a
small, light and inexpensive portable telephone device and speaker and vibrator.
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