HK1061143A - Mobile communication terminal and electro-acoustic transducer used for the same - Google Patents

Description

Portable communication terminal device and electroacoustic transducer used therein

Technical Field

The present invention relates generally to a mobile communication terminal device such as a mobile computer equipped with a mobile phone, a PHS, or a communication modem, and an electroacoustic transducer (hereinafter, referred to as "transducer") used in the mobile communication terminal device.

Background

The cellular phone of fig. 11(a), (b), (c) and fig. 12 will be described as an example of a conventional cellular communication terminal device. Fig. 11(a) is a front view of the mobile phone in use, fig. 11(b) is a side view with a part thereof taken as a cross section, fig. 11(c) is a rear view, and fig. 12 is a side cross-sectional view of an inverter incorporated in the mobile phone.

In fig. 11(a), an operation unit 10a such as a dial key is provided on the front surface of the mobile phone body 10, and a microphone portion (not shown) is also provided in this portion. A display unit 10b having a liquid crystal display and an earphone unit (not shown) are provided in the upper front portion.

In fig. 11(c), an opening 10c is provided in the rear surface, and the sound emitted from the transducer 11 is guided to the outside.

Next, the structure of the inverter 11 will be described with reference to fig. 12.

The outer peripheral portion of the circular diaphragm 1 generating air vibration is supported by an adhesive on the frame 2 provided with the 1 st acoustic hole 2 a. One end of the acoustic coil 3 is fixed to the center of the diaphragm 1, and both ends of the acoustic coil 3 are electrically connected to terminal portions 4 provided below the periphery of the frame 2.

A magnetic circuit including a magnet 5, a top plate 6, and a yoke 7 is provided in a central hole portion of the frame 2, and the voice coil 3 is fitted in a gap between an outer periphery of the top plate 6 and an inner periphery of the yoke 7 of the magnetic circuit.

The protector 8 provided with the 2 nd sound hole 8a protects the diaphragm 1, and the protector 8 and the frame 2 constitute a housing of the transducer.

Therefore, in the above-described mobile phone, only the sound from the 2 nd sound hole 8a of the protector 8 in which the transducer 11 is assembled is radiated to the outside from the opening 10 c. On the other hand, the protector 8 is joined to the inner wall of the mobile phone 10 via a partition, and the transducer 11 is attached to radiate sound from the 1 st sound hole 2a of the frame 2 into the mobile phone 10. Therefore, the sound from the 1 st sound hole 2a and the sound from the 2 nd sound hole 8a of the protector 8 are separated without interference.

In recent years, a portable telephone device has been greatly improved from a conventional telephone function to an information terminal device, and it is desired to improve characteristics such as output sound pressure on the display unit side of an interactive device typified by an increase in the size and color of the display unit side. In recent years, in portable communication terminal devices such as mobile phones, a ratio of sounds generated during screen operations, such as game playback sounds and key confirmation sounds, is high.

In such a situation, when reproduced sound is generated during screen operation, a structure in which an output of the transducer is generated only from the 2 nd sound hole 8a is formed by a conventional transducer or a mounting structure, so that directivity of the mobile communication terminal device to the front side is deteriorated by a diffraction effect, and there is a problem that a sufficient sound quantity and sound quality of the mobile phone to the front side cannot be secured.

Disclosure of Invention

The present invention provides a portable communication terminal device that solves the above problems.

A portable communication terminal device of the present invention uses an inverter having an opening formed in a housing. The opening of the transducer is coupled to a sound tube provided integrally with a casing of the portable communication terminal device or a casing of the transducer. The opening of the sound tube faces an opening provided in the casing of the portable communication terminal device. The portable communication terminal device of the present invention uses a transducer in which a cover and a frame are provided in close contact with the outer periphery of the acoustic diaphragm on the front and rear sides of the acoustic diaphragm, and at least two openings are provided in the cover and the frame. In the transducer according to one embodiment of the present invention, at least two openings or acoustic tubes are provided in either the frame or the cover. In the transducer according to the other embodiment of the present invention, at least one of the two openings and the acoustic tube is provided in the frame, at least the other of the two openings and the acoustic tube is provided in the cover, and the areas of the openings provided in the cover and the frame are substantially equal to each other.

Drawings

Fig. 1(a) is a front view of a portable telephone set body as an embodiment of the portable communication terminal device of the present invention; FIG. 1(b) is a side semi-sectional view; fig. 1(c) is a rear view.

Fig. 2 is a side sectional view of an inverter used in the portable telephone body of fig. 1.

Fig. 3 is an exploded perspective view of the transducer.

Fig. 4(a) is a side sectional view of an inverter in embodiment 2 of the present invention; fig. 4(b) is a perspective view of the inverter according to embodiment 2 of the present invention, as viewed from below.

Fig. 5(a) is a perspective view of a mobile phone device according to embodiment 2 of the present invention; FIG. 5(b) is a rear side perspective view; fig. 5(c) is a front view illustrating a storage state of the mobile phone device.

Fig. 6(a) is a perspective view of an example of expansion of embodiment 2 of the present invention; fig. 6(b) is a rear side perspective view.

FIG. 7(a) is a perspective view of another example of deployment; FIG. 7(b) is a rear side perspective view; fig. 7(c) is a side sectional view of a main portion of another example of deployment.

FIG. 8 is a perspective view of another deployment example;

FIG. 9(a) is a perspective view of another example of deployment; fig. 9(b) is a rear side perspective view.

Fig. 10 is a sound pressure frequency characteristic diagram of the display portion side of the mobile phone device of the developed example of fig. 9.

Fig. 11(a) is a front view of a conventional mobile phone body in a use state; FIG. 11(b) is a side semi-sectional view; fig. 11(c) is a rear view.

Fig. 12 is a side sectional view of a conventional inverter used in a conventional portable telephone set body.

Detailed Description

An embodiment of the present invention will be described below with reference to a mobile phone as an example through the drawings. In the description, the same parts as those in the related art are denoted by the same reference numerals, and the description thereof is omitted.

Embodiment mode 1

Fig. 1(a) is a front view of a mobile phone as an embodiment of a mobile communication terminal device according to the present invention, fig. 1(b) is a side view of the same portion in cross section, fig. 1(c) is a rear view, fig. 2 is a side cross-sectional view of an inverter incorporated in the mobile phone as a main portion, and fig. 3 is an exploded perspective view.

In fig. 1(a) to 3, a 1 st opening 10d is provided on the display portion 10b side of the mobile phone body 12, and a 2 nd opening 10e is provided on the rear surface side of the display portion 10 b.

The transducer 13 built in the mobile phone body 12 is provided with a 2 nd acoustic tube 13b for guiding the sound of the transducer 13 to the 1 st opening 10d and a 1 st acoustic tube 13a for guiding the sound of the transducer 13 to the 2 nd opening 10 e.

In the present embodiment, as shown in fig. 3, the 1 st acoustic tube 13a is integrally molded with the protector (cover) 8b at the time of resin molding of the protector 8b covering the diaphragm, and the 2 nd acoustic tube 13b is integrally molded with the frame 2b at the time of resin molding of the frame 2 b.

Further, although the acoustic tube is not necessarily formed at the same time as the protector 8b or the frame 2b, the simultaneous molding is advantageous in terms of cost. Further, the acoustic tube portion may be molded at the same time when the case of the mobile phone body 12 is molded, and the opening portions may be provided in the 1 st and 2 nd acoustic tube forming portions of the transducer 13.

As shown in fig. 12, in the conventional transducer 11, since the magnetic circuit is attached to the frame 2 side, it is difficult to secure a space for the sound hole 2a on the frame 2 side, and therefore the sound hole 2a on the frame 2 side has a small opening area to suppress vibration of the diaphragm 1 during driving and to an extent that does not interfere with sound emission from the sound hole 8a of the protector 8. In the present embodiment, however, the opening area of the 1 st acoustic tube 13a and the opening area of the 2 nd acoustic tube 13b are made substantially the same, so that the difference in the user's sense of hearing can be suppressed. Further, since there is no restriction condition as in the prior art, the area of the opening of the acoustic pipes 13a and 12b can be increased, and the sound can be efficiently emitted to the outside of the transducer 13, thereby increasing the sound volume.

Further, by arranging the 1 st and 2 nd acoustic tubes 13a and 13b symmetrically about the diaphragm 1, rolling of the diaphragm 1 during driving can be suppressed.

With the inverter 13 configured as described above, the phase difference between the sound radiated from the 1 st aperture 10d and the sound radiated from the 2 nd aperture 10e of the mobile phone body 12 is 180 degrees (reverse phase). That is, the acoustic pipes 13a and 12b are disposed in front and rear of the diaphragm 1, respectively. Therefore, the radiated sound is attenuated and suppressed around the side surface of the mobile phone where the two sounds are diffused and merged.

On the other hand, the amplified sound can be heard efficiently in front of the mobile phone which actually needs the sound.

When the mobile phone body 12 is folded and put in a bag or the like and taken away, the operation portion 10a covers the 2 nd acoustic tube 13b, and thus a call or the like is made by sound radiated from the 1 st acoustic tube 13a that is sounded to the back surface side. In this case, the amplified sound with high efficiency can be heard as in the above.

Therefore, according to the mobile terminal device of the present invention, it is possible to radiate an amplified sound in a desired direction and suppress an unnecessary sound emission in a side direction of the mobile phone.

In the above embodiment, the single transducer 13 is used, and the 1 st and 2 nd acoustic tubes 13a and 13b are radiated to the front and back of the mobile phone body 12. As a result, the mobile phone body 12 can be miniaturized.

That is, in the conventional mobile phone, when only the sound is emitted in the front and rear directions of the mobile phone body 10 and the sound emission to the periphery is suppressed, that is, the directivity of the front and rear is improved, it is effective to use different transducers for the sound emission of the front and rear surfaces and to pass the sound signals inputted to the transducers with a phase difference of 180 degrees. However, in this case, two inverters are required, and therefore, the line becomes complicated, and an extra power, that is, a large battery is required. According to the present embodiment, such a problem can be avoided.

The transducer 13 used in the above embodiment has the 1 st acoustic tube 13a provided in the protector 8b constituting one side of the transducer case and the 2 nd acoustic tube 13b provided in the frame 2b constituting the other side of the case, but an opening may be provided by a mounting gap with the mobile phone body 12, and whether or not an acoustic tube is used, only one side acoustic tube, or the like may be appropriately selected and included.

As described above, the portable communication terminal device according to the present embodiment is a portable communication terminal device having a good directivity of radiating sound from the front and rear surfaces, and the front and rear surfaces are respectively radiated with a phase difference of 180 degrees at the peripheral position, and cancel each other out, thereby suppressing the influence of the radiated sound on the periphery.

Embodiment mode 2

Fig. 4(a) is a cross-sectional view of the inverter according to embodiment 2 of the present invention, and fig. 4(b) is a perspective view seen from below.

The following mainly explains the difference from embodiment 1. The 1 st and 2 nd acoustic tubes 32b and 32c are integrally provided in a resin frame 32a formed by insert molding a magnetic circuit. The 1 st acoustic tube 32b and the 2 nd acoustic tube 32c are both disposed below the diaphragm 33. In the transducer of the present embodiment, since the 1 st acoustic tube 32b and the 2 nd acoustic tube 32c are both provided below the diaphragm 3, acoustic waves generated and radiated by the vibration of the diaphragm 33 are in phase. However, the 1 st acoustic tube 32b is downwardly radiated, and the 2 nd acoustic tube 32c is laterally radiated. The acoustic pipes 32b and 32c can radiate sound in directions different by 90 degrees, and the sound waves generated are in phase, so that they do not interfere with each other, and the sound pressure can be increased.

Embodiment 3

Fig. 5(a) and 5(b) are perspective views of a folding-type portable telephone device using the inverter according to embodiment 2, and fig. 5(c) is a front view for explaining a state in which the portable telephone device is stored in a breast pocket. The mobile phone device main body 40 is composed of a display unit 41 for displaying input information or telephone information and an operation unit 42 for inputting a telephone number or the like.

The 1 st opening 43 provided below the display unit 41 is connected to the 1 st sound tube 32b of the transducer described in embodiment 2. The 2 nd opening 44 provided in the lower end surface of the display portion 41 is connected to the 2 nd acoustic tube 32c of the transducer.

The connection relationship between the 1 st and 2 nd sound tubes of the transducer and the 1 st and 2 nd openings of the mobile phone device is the same in the following embodiments and development examples, and the description thereof will be omitted below.

As described above, by providing the 2 nd opening 44 on the end face of the mobile phone device, when stored in a breast pocket or the like as shown in fig. 2(c), a call sound is radiated from the end face, and whether or not reception is easy to confirm.

In the above embodiment, the 2 nd opening 44 is provided in the lower end surface, but an opening may be provided in the side surface. According to the present embodiment, compared to a sound emitting port having a transducer provided on the back surface as in the related art, when stored in a pocket, there is no obstacle to the ear of the owner of the mobile phone, and the user can easily perceive a call sound. In addition, considering the state of being stored in the pocket, the 2 nd opening is provided in the end face of the upper part or the lower part of the cellular phone device in the shape of a rectangular parallelepiped, and is more desirable because there is a state where there is no obstacle between the cellular phone device and the ear of the owner of the cellular phone device.

In the present embodiment, since the mobile phone device is stored in a folded state, the 1 st opening 43 provided on the surface of the display portion 41 is closed when a call sound is generated. Therefore, the sound pressure of the 2 nd opening 44 rises, and the call sound of the user of the mobile phone is more strongly notified. In addition, when the mobile phone is used, the 2 nd opening 44 can be closed by the end face of the operation portion 42 by opening the folded portion. This improves the sound pressure output from the 1 st opening 43 in use.

Further, according to the arrangement of the openings shown in fig. 5(a), since sound is radiated from the 1 st opening 43 on the display unit 41 side, the information displayed on the display unit 41 and the sound amplification from the opening 43 are information from the same direction, and thus the sound can be heard without discomfort.

In addition, since the calling sound and the sound amplification are radiated from one transducer, the space occupied by the transducer in the mobile phone device is reduced, which contributes to the miniaturization of the device.

Fig. 6(a) to 9(b) are developed examples of the present embodiment, and in any usage state, the 1 st openings 45, 47, 49, 51 that emit sound upward and the 2 nd openings 46, 48, 50, 52 that emit sound from any one of the upper, lower, and side surfaces when stored are provided. With this arrangement, the call sound can be easily detected when stored, and the radiated sound from the 1 st opening can be heard without unnatural sensation as a sound transmitted from the operation unit or the display unit to the user when used.

Further, with the use of the transducer described in embodiment 2, the 1 st sound tube 2b is connected to the 1 st opening, the 2 nd sound tube 2c is connected to the 2 nd opening, and sound is emitted in two directions by one transducer, which contributes to downsizing of the mobile phone device.

In fig. 6(a) and (b), in the folding cellular phone device, the 1 st opening 45 is provided in the upper part of the operation unit 42, the 2 nd opening 46 is provided in the upper end face of the operation unit 42, and when the device is stored in a folded state, the 1 st opening 45 is closed by the operation unit 42, and the sound pressure of the call sound from the 2 nd opening 46 is increased. In use, the 2 nd opening 46 is closed by the lower end face of the display unit 12, and the output sound pressure of the radiated sound from the 1 st opening 45 can be increased.

In fig. 7(a) and (b), a 1 st opening 47 is provided in an upper surface of the display portion 41, and a 2 nd opening 48 is provided in an upper side surface of the display portion 41. When stored, the 1 st opening 47 is closed by the operation portion 42, and the output sound pressure of the call sound from the 2 nd opening 47 is increased.

In addition, since the sound radiated in use is in phase, the output from the 2 nd aperture 18 goes around to the display unit 41 side, and the same effect as that of increasing the output sound pressure from the 1 st aperture 47 can be obtained substantially.

In addition, although fig. 7(a) and (b) are foldable cellular phones, as shown in fig. 7(c), the 1 st opening 47 may be provided on the upper surface of the display portion of an unfolded cellular phone device, and the 2 nd opening 48 may be provided on the upper side surface or the upper end surface. According to this configuration, when a call is made at the time of storage, sound is radiated from the display unit surface side by one transducer, and the size of the mobile phone device is reduced. Similarly to the development examples of fig. 7(a) and (b), the output sound pressure can be increased by making the output from the 1 st opening and the output from the 2 nd opening in the same phase. In addition, in the unfolded type mobile phone device, the same effect can be obtained by providing the 1 st opening on the lower upper surface of the operation portion and the 2 nd opening on the lower side surface or the lower end surface.

In fig. 8, a 1 st opening 49 is provided in a lower portion of the operation portion 42 of the mobile phone device, and a 2 nd opening 50 is provided in a lower end face of the operation portion 42. When stored, the display 41 closes the 1 st opening 49, and the sound pressure of the call sound from the 2 nd opening 50 is increased. In addition, when in use, the output from the 2 nd opening 50 also goes around to the display portion 41 side, and substantially the same effect as that of increasing the output sound pressure of the radiated sound from the 1 st opening 49 can be obtained.

In fig. 9(a) and (b), a 1 st opening 51 is provided in an upper surface of the operation portion 42, and a 2 nd opening 52 is provided in an upper side surface of the operation portion 42. When stored, the display unit 41 closes the 1 st opening 51, and the output sound pressure of the call sound from the 2 nd opening 52 is increased.

In addition, since the sound radiated in use is in phase, the output from the 2 nd opening 52 also goes around to the operation portion 12 side, and the same effect as that of increasing the output sound pressure from the 1 st sound emitting port 21 can be obtained substantially.

Fig. 10 is a sound pressure/frequency characteristic diagram of the display unit 41, and a curve X is a curve of the mobile phone device shown in fig. 5(a) when it is used. The 2 nd opening 44 is in a state of being closed by an end surface of the operation portion 42. Curve Y is a curve of the mobile phone device of fig. 7(a), and curve Z is a curve of the conventional mobile phone device.

As can be seen from fig. 10, the sound pressure output was high even though the side sound emission port was closed in use since the opening was provided on the display unit side, and it was confirmed that the output from the side sound emission port was better than before.

As described above, by forming a plurality of acoustic tubes provided in the frame and using a transducer provided with a plurality of acoustic tubes provided on the same side as the diaphragm, the output sound pressure of the mobile phone device can be increased and the device can be miniaturized.

In the above description of embodiments 1 to 3, the case where the number of acoustic tubes and the number of openings are two has been described as an example. However, the number of openings of the acoustic tube and the terminal device may be 3 or more in accordance with other required characteristics than the acoustic characteristics, and for example, the simultaneous radiation of sound to the operation surface and both side surfaces may be realized.

In the above description, although an electrodynamic transducer is described as an example, it is easy to determine that the transducer of the present invention is not limited to an electrodynamic transducer, and a piezoelectric transducer may be applied. As the piezoelectric transducer, there are transducers that generate sound by directly driving a piezoelectric ceramic or a piezoelectric film by an electric signal and that generate sound by combining the piezoelectric ceramic and a vibrating plate. In the present invention, it is preferable to use a type in which a piezoelectric film is used in the vibration plate or a piezoelectric ceramic is combined with the vibration plate.

The case of using such a piezoelectric type transducer is advantageous for reducing the power consumption of the portable communication terminal apparatus.

Industrial applicability

As described above, the portable communication terminal device and the electroacoustic transducer used therein according to the present invention can radiate a large sound pressure output, although they are small and have low power consumption. In addition, when the device is used, natural sound with the display part harmonious with the direction is emitted, and the industrial utilization value is high.

Claims (17)

1. A portable communication terminal device has an electroacoustic transducer having at least two openings or acoustic pipes formed therein, the openings of the electroacoustic transducer or the openings of the acoustic pipes being opposed to at least two openings provided in a casing of the portable communication terminal device.

2. The portable communication terminal device according to claim 1, wherein: the at least two openings or acoustic pipes are formed on the diaphragm side of the electroacoustic transducer.

3. The portable communication terminal device according to claim 1, wherein: at least one of the at least two openings and the acoustic tube is formed on one side of a diaphragm of the electroacoustic transducer, and at least another one is formed on the other side of the diaphragm.

4. The portable communication terminal device according to claim 1, wherein: an acoustic pipe formed integrally with the casing of the portable communication terminal device is coupled to an opening of the electroacoustic transducer.

5. The portable communication terminal device according to claim 1, wherein: at least one of the openings is formed on the same face as a display device of the portable communication terminal device.

6. The portable communication terminal device according to claim 1, wherein: at least one of the openings is opened to an outer surface in a state where the portable communication terminal device is folded.

7. The portable communication terminal device according to claim 6, wherein: the opening formed in the outer surface is closed when the portable communication terminal device is used.

8. The portable communication terminal device according to claim 6, wherein: an opening formed in the outer surface is formed on a back surface or a side surface of the case surface on which the display device is disposed.

9. The portable communication terminal device according to claim 1, wherein: the opening portion of the sound tube is combined with an opening provided in the casing.

10. The portable communication terminal device according to claim 1, wherein: the electroacoustic transducer may be either an electrodynamic electroacoustic transducer or a piezoelectric electroacoustic transducer.

11. An electro-acoustic transducer comprising: framing; a vibration plate whose outer periphery is fitted on the frame; a cover joined to the entire periphery of the frame and facing a reverse surface of the frame of the vibration plate; and at least two openings provided in at least one of the frame and the cover.

12. The electro-acoustic transducer of claim 10, wherein: the sound tube is coupled to the opening.

13. The electro-acoustic transducer of claim 11 or 12, wherein: the opening or the sound tube is provided on one of the frame and the cover.

14. The electro-acoustic transducer of claim 11 or 12, wherein: at least one of the at least two opening portions or the sound tubes is provided in the frame, and at least another one of the at least two opening portions or the sound tubes is provided in the cover.

15. The electro-acoustic transducer of claim 11, wherein: a magnetic circuit having a magnetic gap and mounted on the frame; and a sound ring inserted into the magnetic gap, the vibration plate being joined to the sound ring.

16. The electro-acoustic transducer of claim 11, wherein: the piezoelectric porcelain is also combined on the vibration plate.

17. The electro-acoustic transducer of claim 11, wherein: the vibration plate is a piezoelectric porcelain or a piezoelectric film.