JP2003264881

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DESCRIPTION JP2003264881
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
mobile phones and other electronic devices for notifying users of information.
[0002]
BACKGROUND OF THE INVENTION In an electronic device such as a mobile phone or pager, it is
necessary to notify a user of an incoming call or the like. At that time, there is known one having
a voice mode in which notification is performed by voice and a vibration mode in which
notification is performed by generating vibration. Here, in the audio mode, an audio signal is
emitted through the audio amplifier and the speaker. In the vibration mode, vibration is applied
to the electronic device main body mainly by the eccentric motor or the like.
[0003]
In recent years, flat-panel speakers have attracted attention as speakers of electronic devices. The
flat speaker vibrates a relatively strong diaphragm by an actuator to emit sound, and has an
advantage that a wide frequency band can be secured even if it is small.
[0004]
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By the way, in the conventional electronic apparatus such as a portable telephone, a speaker for
voice output and an eccentric motor are separately provided. The conventional electronic device
has an unnecessarily large number of parts since both are provided separately despite having
common functions in that they give vibration to the object, which results in a large-sized device
and reliability. Was a problem. The present invention has been made in view of the abovedescribed circumstances, and an object thereof is to provide an electronic device which can be
configured to be small and lightweight, and can ensure high reliability.
[0005]
SUMMARY OF THE INVENTION In order to solve the above problems, according to the present
invention, an audio signal of an audible frequency is generated from a flat speaker and the flat
speaker, and information is notified to the user by the voice signal. And sound notification means
for vibrating the flat speaker at a fundamental frequency lower than the audible frequency and
notifying information to the user by the vibration. Preferably, the electronic apparatus further
comprises operation mode selection means for selecting one of the operation modes of a
vibration mode for operating the vibration notification means or a voice mode for operating the
voice notification means. The electronic device preferably further comprises a lock mechanism
for fixing the predetermined position of the flat speaker in the vibration mode and releasing the
fixation at the predetermined position in the voice mode.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION First, the planar speaker used in the mobile
phone according to the embodiment of the present invention will be described with reference to
FIG. In the conventional cone-type loudspeaker shown in FIG. 5A, sound propagates in a direction
perpendicular to the vibration plane of the cone, so acoustic energy propagates nonlinearly.
Furthermore, interference is likely to occur if the cone is formed unbalanced. Therefore, when a
component such as a coil is added to the cone, the bandwidth of vibration is limited and a change
appears in the reproduced sound.
[0007]
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On the other hand, the configuration and operation principle of the flat loudspeaker shown in
FIGS. 5 (b) and 5 (c) will be described. 13 is a diaphragm and 4 is an actuator for exciting the
diaphragm 13. The actuator 4 is in contact with one end of the diaphragm 13. The actuator is
configured using a coil and a magnet, and converts an electrical signal into mechanical vibration.
In the high frequency region, the generated vibration is reflected at the other end of the
diaphragm 13, and the entire diaphragm 13 is wound and transmitted to the air (FIG. 5 (b)). In
the middle and low frequency region, the diaphragm as a whole vibrates in the normal direction
of the surface, and the vibration is transmitted to the air (FIG. 5C). In both cases, since the plane
of vibration is flat, acoustic energy is emitted linearly on both sides. Therefore, no interference
occurs even when parts are added to the vibrating surface, and no change appears in the sound.
[0008]
2. Configuration of Embodiment Next, an overall view of a mobile phone according to an
embodiment of the present invention is shown in FIG. Moreover, the AA 'cross section figure of
the mobile telephone is shown to Fig.1 (a), and the figure which shows the operation ¦ movement
principle is shown in FIG.1 (b). The following description is given with reference to these figures.
In FIG. 1A, reference numeral 1 denotes a substantially rectangular liquid crystal panel, on which
various displays are performed. Reference numeral 2 denotes a substantially rectangular
transparent diaphragm, which is abutted against the actuator 4 at its end 2a, and covers the
surface of the liquid crystal panel 1 with a gap by the other part 2b. Since the diaphragm 2 is
transparent, it is possible to visually recognize the display of the liquid crystal panel 1 from the
outside.
[0009]
A holding mechanism 30 has a claw shape and is fixed to the case 5. The holding mechanism 30
fixes or releases the diaphragm 2 and the case 5 by sandwiching both side surfaces of the
diaphragm 2 as needed at the boundary between the part 2a of the diaphragm 2 and the other
part 2b. A mode setting switch 11 selects the voice mode or the vibration mode. A control circuit
10 drives the holding mechanism 30 according to the selected mode.
[0010]
The actuator 4 is configured using a magnet, a coil, etc., and constitutes a flat speaker together
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with the diaphragm 2. The actuator 4 has a function of converting an electrical signal into
mechanical vibration. A case 5 of a mobile phone is provided with a pedestal 5 a for fixing the
liquid crystal panel 1 and the actuator 4.
[0011]
3. Operation Principle of Embodiment In order to notify the user of incoming call information
of the mobile phone, as described above, there are the vibration mode and the voice mode, and
both modes are switched by the mode setting switch 11. As the vibration waveform in the
vibration mode, an intermittent vibration waveform shown in FIG. 1C, that is, a waveform in
which square wave vibration is not continuously applied but intermittently applied at constant
intervals is used. Also, the fundamental wave of the intermittent vibration waveform is set to be
less than the audio frequency. A diagram showing the operation principle in the vibration mode
is shown in FIG.
[0012]
In this mode, the diaphragm 2 and the case 5 are fixed by the holding mechanism 30. As a result,
the vibration from the actuator 4 generated by the electrical signal at a frequency lower than the
audio frequency is transmitted to the portion of the diaphragm 2a. The vibration causes the
portion of the diaphragm 2b to elastically vibrate largely with the holding mechanism 30 as a
fulcrum. Further, the liquid crystal panel 1 and the diaphragm 2 are not in contact with each
other due to the gap between the portion of the diaphragm 2 b and the liquid crystal panel 1.
[0013]
And the vibration by this diaphragm 2b is transmitted to case 5 through the holding mechanism
30, and alert ¦ reported to a human body. On the other hand, since the resonance frequency of
the vibration applied to the whole mobile phone is low, sufficient vibration can be obtained in the
whole mobile phone by adding the intermittent vibration waveform shown in FIG. 1 (c).
[0014]
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When the positional relationship of the holding mechanism 30 with respect to the diaphragm 2
is changed, the resonance point of the diaphragm 2 is changed. The resonance point can also be
changed by providing the weight 12 at the end of the diaphragm 2 opposite to the actuator.
[0015]
On the other hand, in the audio mode, the holding mechanism 30 is released and the diaphragm
2 and the case 5 are separated. As a result, the vibration from the actuator 4 generated by the
electrical signal of the audio frequency is transmitted to the entire surface of the diaphragm 2
and notified as sound.
[0016]
4. Modifications The present invention is not limited to the above-described embodiment, and
various modifications can be made, for example, as follows. (1) In the above embodiment, the
actuator 4 is fixed, the holding mechanism 30 is provided on the actuator side of the diaphragm
2, and the diaphragm 2 is vibrated with this as a fulcrum. On the other hand, it is also possible to
provide a holding mechanism at the other end of the diaphragm 2, fix it to the case 5 via this,
and cause the actuator 4 itself to vibrate largely. A configuration diagram of this case is shown in
FIG.
[0017]
In this modification, in addition to the liquid crystal panel 1, the diaphragm 2, the actuator 4 and
the case 5 described above, a holding mechanism 31 and an elastic body 60 such as a sponge or
rubber are provided. The actuator 4 is held by the case 5 via the elastic body 60. The holding
mechanism 31 is fixed to the case 5 in the same manner as the holding mechanism 30, and
presses the end of the diaphragm 2 as needed to fix or release the diaphragm 2 and the case 5.
[0018]
In this configuration, the holding mechanism 31 fixes the case 5 and the end of the diaphragm 2
so that the vibration of the actuator 4 is transmitted to the case 5 via the holding mechanism 31
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and notified to the human body. Further, when the holding mechanism 31 is released, the
vibration by the actuator 4 is transmitted to the diaphragm 2 and notified as sound.
[0019]
(2) Furthermore, although the said modification fixed the one end of the diaphragm 2 to case 5
using the holding mechanism 31, it is also possible to fix the side of the diaphragm 2 using a
holding mechanism. This configuration is shown in FIG. 3 (a), and an AA 'cross-sectional view for
showing the holding mechanism 32 is shown in FIG. 3 (b). The holding mechanism 32 includes a
holding claw 32a and a fixing tool 32b. The fixture 32 b is fixed to the case 5, and the diaphragm
2 is held by the fixture 32 b using an elastic body 61 such as a sponge, a rubber, or a spring.
[0020]
In the vibration mode, the holding claw 32 a moves along the fixture 32 b and presses the
diaphragm 2 to fix the diaphragm 2 to the case 5. As a result, the vibration by the actuator 4 is
transmitted to the case 5 through the holding mechanism 32 and notified to the human body.
Further, when the holding mechanism 32 is released, the vibration by the actuator 4 is
transmitted to the diaphragm 2 and notified as sound.
[0021]
(3) In the above modification, the actuator 4 is fixed to the case 5 through the elastic body 60.
However, it is also possible to fix a weight to the actuator 4 and fix this weight using a reverse
holding mechanism. . A cross-sectional view of a mobile phone using this reverse holding
mechanism is shown in FIG. In the figure, the reverse holding mechanism 8 is released when the
holding mechanism 33 fixes the case 5 and, conversely, functions to fix the case 5 and the weight
7 when the holding mechanism 33 releases the diaphragm 2. Have. The structure of the holding
mechanism 33 is the same as the structure of the holding mechanism 32.
[0022]
In the vibration mode, the entire side surface of the diaphragm 2 is fixed to the case 5 by the
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holding mechanism 33, and the reverse holding mechanism 8 is released. Thereby, the vibration
generated by the actuator 4 is transmitted to the case 5 through the diaphragm 2 and the
holding mechanism 3 and notified by the human body. The vibration by the actuator 4 is
enhanced by the weight 7.
[0023]
On the other hand, in the voice mode, the holding mechanism 33 is released and the reverse
holding mechanism 8 is fixed. Thereby, the vibration generated by the actuator 4 is transmitted
to the air through the diaphragm 2 and notified as sound.
[0024]
(4) In the above modification, it is assumed that there is no simultaneous use of the vibration
mode and the voice mode, but by switching the vibration mode and the voice mode in a short
cycle, it is possible to perform notification using vibration and voice together .
[0025]
As described above, according to the present invention, the notification of information by an
audio signal and the notification of information by vibration can be realized using a common flat
speaker, so the electronic device can be made smaller and lighter. It is possible to secure high
reliability.
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