JP4561751B2 - Speaker and portable device using it - Google Patents

Description

  The present invention relates to a speaker and a portable device using the speaker.

For example, in a portable device such as a mobile phone, as is well known, a speaker is built in a main body housing for receiving and receiving a call (for example, Patent Document 1 below).
JP 2000-257758 A

  The speaker used in the conventional example has a configuration including a diaphragm, a voice coil coupled to the diaphragm, and a magnetic circuit in which the voice coil is disposed in the magnetic gap. When this speaker is installed in the main body casing of the portable device, the acoustic characteristics, that is, the sound quality, etc. vary depending on the acoustic space in the main body casing of the portable device.

  In other words, the sound quality of the speaker is greatly affected by the acoustic space provided in the portable device in which it is installed, but the acoustic space differs for each portable device, so even though the same speaker is used. That is, the acoustic characteristics, that is, the sound quality and the like fluctuate. Therefore, the present invention aims to suppress fluctuations in acoustic characteristics, that is, sound quality and the like for each portable device.

In order to achieve this object, the present invention provides a speaker housing, a diaphragm provided in the speaker housing, a voice coil coupled to the diaphragm, and the voice coil disposed in the magnetic gap. A magnetic circuit, and a sound emission port is formed in a speaker housing part in contact with one surface side of the diaphragm, and a vibration load suppressing body is provided in a speaker housing inner part in contact with the other surface side of the diaphragm, The first vent of the air passage is connected to the acoustic downstream side of the vibration load suppressing body viewed from the other surface side of the diaphragm, and the second vent of the air passage is connected to the outside of the speaker housing , The ventilation path is configured by a narrow groove provided on the outer surface side of the speaker housing and a cover that covers the outer surface side of the narrow housing of the narrow groove .

As described above, the present invention includes a speaker casing, a diaphragm provided in the speaker casing, a voice coil coupled to the diaphragm, and a magnetic circuit in which the voice coil is disposed in the magnetic gap. And a sound emission opening is formed in a speaker housing portion in contact with one surface side of the diaphragm, and a vibration load suppressing body is provided in a speaker housing portion in contact with the other surface side of the diaphragm. A first air vent of the air passage is connected to the acoustic downstream side of the vibration load suppressor viewed from the surface side, the second air vent of the air passage is connected to the outside of the speaker housing , and the air passage is connected to the speaker. Since the narrow groove provided on the outer surface side of the housing and the cover that covers the outer surface of the speaker housing of the narrow groove are provided , and the diaphragm is provided in the speaker housing, the portable device in which the speaker is installed The acoustic space provided by Acoustic properties, that is, the sound quality and the like can be prevented from being fluctuated.

  In addition, a sound emission port is formed in the speaker housing portion that is in contact with the one surface side of the diaphragm, and a vibration load suppressing body is provided in the speaker housing portion that is in contact with the other surface side of the diaphragm. Although the plate is installed in the speaker housing, the decrease in sound pressure can be suppressed.

  That is, when the diaphragm is installed in the speaker housing, the diaphragm vibrates when the portion inside the speaker housing that is in contact with the other surface of the diaphragm becomes a small space as a result of downsizing for portable devices. However, if a vibration load suppressor is provided in this part, the vibration load when the diaphragm vibrates can be suppressed, resulting in a decrease in sound pressure. Can also be suppressed.

  Further, a first ventilation port of the ventilation path is connected to the acoustic downstream side of the vibration load suppressing body viewed from the other surface side of the diaphragm, and the second ventilation hole of the ventilation path is connected to the outside of the speaker housing. Therefore, a decrease in sound pressure can also be suppressed from this point.

  In other words, when the diaphragm is installed in the speaker housing, the portion inside the speaker housing that is in contact with the other side of the diaphragm becomes a small space as a result of miniaturization for portable devices. If the air expands or contracts, it immediately increases the vibration load when the diaphragm vibrates, but the air flow path is connected to the downstream side of the vibration load suppressor as viewed from the other side of the diaphragm. If one air vent is connected and the second vent of this air passage is connected to the outside of the speaker housing, if the air in this space expands or contracts due to temperature change, the air flow through the air passage As a result, the fluctuation in atmospheric pressure is suppressed, and as a result, the vibration load when the diaphragm vibrates can be suppressed, and thereby the decrease in sound pressure can also be suppressed.

  FIG. 1 shows one embodiment of the present invention applied to a mobile phone as a mobile device.

  In FIG. 1, reference numerals 1 and 2 are folded in half and a lower main body casing, and an upper main body casing 1 is provided with a liquid crystal display 3.

  Although not shown, an operation portion is provided on the surface side of the lower main body housing 2.

  Furthermore, sound emission ports 4 are formed on the left and right sides of the main body housing 2, and speakers 5 are respectively built in the main body housing 2 corresponding to the sound emission ports 4.

  As shown in FIG. 2, the speaker 5 includes a rectangular parallelepiped speaker housing 9 formed by an upper cover 6 whose bottom surface is open, a frame body 7, and a lower cover 8.

  Further, in the speaker housing 9, a rectangular diaphragm 10, a voice coil 11 coupled to an outer periphery of a rectangular parallelepiped frame body 10 a protruding upward of the diaphragm 10, and the voice coil 11 are magnetically coupled. A magnetic circuit 13 disposed in the gap 12 is accommodated.

  Further, the magnetic circuit 13 is provided on the lower side of the diaphragm 10, specifically, the magnet 14 inside the upward projecting rectangular parallelepiped frame 10a, the top plate 15, and the upper side of the diaphragm 10, specifically, the upward projecting rectangular parallelepiped shape. The left and right outer magnets 16 of the frame 10a, the upper cover 6, a metal ring 17, and a top-opening plate-shaped yoke 18 are formed.

  That is, the magnetic flux emitted from the upper surface of the magnet 14 first passes from the top plate 15 to the left and right through the upward projecting rectangular parallelepiped frame 10a of the diaphragm 10, and then from the lower surface of the left and right outer magnets 16 to this magnet 16. After entering, it enters the upper cover 6 from above the magnet 16, then proceeds downward on the outer periphery of the upper cover 6, passes through the metal ring 17, the upper surface opening-shaped yoke 18, and then returns to the lower surface of the magnet 14. It will be.

  At that time, a magnetic driving force is applied to the voice coil 11 in the magnetic gap 12, and as a result, the diaphragm 10 vibrates and a sound is produced.

  Then, this sound is emitted from the upper surface of the diaphragm 10 to the outside of the main body housing 2 from the sound emitting ports 4 provided on the left and right sides of the main body housing 2 via the two left and right sound emitting ports 19 provided on the upper cover 6. The Rukoto.

  That is, in the present embodiment, the diaphragm 10 is provided in the speaker housing 9 to constitute the speaker 5, and therefore, depending on the acoustic space environment in the main body housing 2 of the mobile phone (mobile device) in which the speaker 5 is installed, It is possible to suppress fluctuations in the acoustic characteristics, that is, sound quality and the like.

  In addition, a vibration load suppressing body 20 is provided in a speaker housing inner portion that is in contact with the lower surface (other surface) side of the diaphragm 10, specifically, an upper surface opening constituted by the frame body 7 and the lower cover 8. This vibration load suppressing body 20 is formed by folding a plurality of cloth-like activated carbons, and the surface has numerous fine irregularities peculiar to the active body, and since it is cloth-like, it has air permeability. Have.

  That is, in this embodiment, since the vibration load suppressing body 20 is provided on the lower surface side of the diaphragm 10, the sound pressure is reduced despite the diaphragm 10 being installed in the speaker housing 9. Can be suppressed.

  That is, when the diaphragm 10 is installed in the speaker housing 9, the portion inside the speaker housing 9 that is in contact with the lower (other surface) side of the diaphragm 10 becomes a small space as a result of aiming for miniaturization for portable devices. As a result, the vibration load when the diaphragm 10 vibrates increases.

  Therefore, in this embodiment, since the vibration load suppressing body 20 is provided in the lower portion, there are portions that have not been clarified yet in the lower portion. Due to the influence, as a conclusion, even if the inner part of the speaker housing 9 in contact with the lower (other surface) side of the diaphragm 10 is a small space, the vibration load when the diaphragm 10 vibrates is suppressed from increasing. As a result, a decrease in sound pressure can be suppressed.

  Further, as shown in FIG. 3, on the outer surface of the frame body 7 of the speaker housing 9 on the acoustic downstream side of the vibration load suppressing body 20 viewed from the lower side (other surface) of the diaphragm 10, there is a frame body 7. Since the air flow path 23 is constituted by the narrow groove 21 provided on the outer surface side of this and the cover 22 that covers the outer surface side of the frame body 7 of the speaker housing 9 of the narrow groove 21, it is possible to suppress a decrease in sound pressure. It becomes.

  In other words, when the diaphragm 10 is installed in the speaker housing 9, the inner portion of the speaker housing 9 that is in contact with the lower (other surface) side of the diaphragm 10 is aimed at downsizing for portable devices as described above. When the space becomes small, when the air in this space expands or contracts due to a temperature change, it immediately increases the vibration load when the diaphragm 10 vibrates.

  Therefore, in the present embodiment, as shown in FIG. 4, the first vent 24 of the vent passage 23 is connected to the acoustic downstream side of the vibration load suppressing body 20 as viewed from the lower side (other side) of the diaphragm 10. The second vent 25 of the vent passage 23 is connected to the outside of the speaker housing 9 through two sound outlets 19 provided on the left and right sides of the upper cover 6. If the air expands or contracts, the air pressure fluctuation is suppressed by ventilation through the ventilation path 23, and as a result, the vibration load when the diaphragm 10 vibrates is suppressed, thereby suppressing the sound. The decrease in pressure can also be suppressed.

  The air passage 23 has a very small diameter as long as simple ventilation is performed. Therefore, the sound from the lower (other surface) side of the diaphragm 10 is provided on the upper cover 6 via the air passage 23. There is virtually no leakage to the two sound outlets 19. Moreover, since the vibration load suppressing body 20 configured by folding a plurality of cloth-like activated carbons is provided in the passage from the lower (other surface) side of the diaphragm 10 to the sound emission opening 19 through the air passage 23, The vibration load suppressing body 20 also serves as a resistance of sound from the lower side (other side) of the diaphragm 10 to the sound emission port 19 via the ventilation path 23, and also from the lower side (other side) of the diaphragm 10. There is substantially no leakage of sound to the sound outlet 19 through the air passage 23.

  Further, the upper opening plate-shaped yoke 18 is provided with an opening 18a for ensuring ventilation from the lower (other surface) side of the diaphragm 10 to the ventilation path 23. The ventilation plate 26 is provided with an opening 26a facing the opening 18a. However, the opening 26a is provided with a mesh with a minute opening so that even if the minute activated carbon material is peeled off from the cloth-like activated carbon, the minute activated carbon material does not reach the magnetic circuit 13 portion on the yoke 18. Yes.

  It is also conceivable that the fine activated carbon material peeled from the cloth-like activated carbon moves in the direction of the sound emission port 19 through the air passage 23. However, as described above, the air passage 23 has a very small diameter because it needs only to be ventilated. Therefore, the possibility that the fine activated carbon material peeled from the cloth-like activated carbon moves in the direction of the sound outlet 19 through the air passage 23 is extremely low.

  Even if the fine activated carbon material peeled from the cloth-like activated carbon may move in the direction of the sound outlet 19 through the air passage 23, the frame of the narrow groove 21 constituting the air passage 23 as described above. 7 The separated activated carbon material is adsorbed here by the cover 22 covering the outer surface side, and the activated carbon material separated from the cloth-like activated carbon also moves toward the sound emission port 19 through the air passage 23 from this point. The possibility is very low.

  That is, in this embodiment, since the cover 22 is composed of a double-sided tape, the portion facing the opening of the narrow groove 21 functions as an adsorption surface, and the fine activated carbon peeled from the cloth-like activated carbon on the adsorption surface. Since the substance is adsorbed, the possibility that the fine activated carbon substance peeled from the cloth-like activated carbon as described above moves in the direction of the sound emission port 19 through the air passage 23 is extremely low.

  A mesh-structured ventilation cover 27 having a minute opening is attached and integrated on the outer surface side of the cover 22 made of double-sided tape, and the ventilation cover 27 covers the sound emission port 19. .

  Also, a double-sided tape 28 is stuck and integrated on the outer surface side of the speaker housing 9 of the ventilation cover 27, and an impact disposed on the outer peripheral portion of the sound outlet 19 of the speaker housing 9 on the outer surface side of the speaker housing 9 of the double-sided tape 28. The buffer body 29 is stuck and integrated.

  The shock buffer 29 attaches the speaker housing 9 to the inner surface of the main body housing 2 in an impact buffering manner, and a sound outlet is provided between the sound outlet 19 and the sound outlet 4 of the main body housing 2. 29a is provided.

As described above, the present invention includes a speaker casing, a diaphragm provided in the speaker casing, a voice coil coupled to the diaphragm, and a magnetic circuit in which the voice coil is disposed in the magnetic gap. And a sound emission opening is formed in a speaker housing portion in contact with one surface side of the diaphragm, and a vibration load suppressing body is provided in a speaker housing portion in contact with the other surface side of the diaphragm. the first vent gas passage connected to the acoustic downstream side of the vibrating load suppressor viewed from the side, a second vent in the vent passage is connected to the speaker housing outer, the air passage includes a speaker Since the narrow groove provided on the outer surface side of the housing and the cover that covers the outer surface of the speaker housing of the narrow groove are provided , and the diaphragm is provided in the speaker housing, the portable device in which the speaker is installed The acoustic space provided by Acoustic properties, that is, the sound quality and the like can be prevented from being fluctuated.

  In addition, a sound emission port is formed in the speaker housing portion that is in contact with one surface side of the diaphragm, and a vibration load suppressing body is provided in the speaker housing portion that is in contact with the other surface side of the diaphragm. Although the plate is installed in the speaker housing, a decrease in sound pressure can be suppressed.

  Therefore, high sound quality can be provided in various portable devices.

The perspective view which applied one Embodiment of this invention to the mobile telephone The disassembled perspective view of the speaker of one Embodiment of this invention The partially broken perspective view of the speaker of one Embodiment of this invention Partially cutaway sectional view of an embodiment of the present invention applied to a mobile phone

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body housing | casing 2 Main body housing | casing 4 Sound emission port 5 Speaker 9 Speaker housing | casing 10 Diaphragm 11 Voice coil 12 Magnetic gap 13 Magnetic circuit 19 Sound emission port 20 Vibration load suppression body 21 Narrow groove 22 Cover 23 Air flow path 24 1st 25 vents for the second

Claims (11)

A speaker housing; a diaphragm provided in the speaker housing; a voice coil coupled to the diaphragm; and a magnetic circuit disposed in the magnetic gap of the voice coil; A sound emission opening is formed in the speaker housing part in contact with the one surface side, and a vibration load suppressing body is provided in the speaker housing inner part in contact with the other surface side of the diaphragm so that the vibration load viewed from the other surface side of the diaphragm connecting the first vent gas passage on the acoustic downstream of the repressor, the second vent port of the vent passage is connected to the speaker housing outer, the air passage is provided in the speaker housing outer surface A speaker constituted by a narrow groove and a cover covering the outer surface side of the speaker housing of the narrow groove . The speaker according to claim 1, wherein the voice coil and the magnetic circuit are housed in an inner portion of the speaker housing that is in contact with one surface side of the diaphragm. The speaker according to claim 1, wherein the vibration load suppressor is made of activated carbon. The speaker according to claim 3, wherein the vibration load suppressor is made of cloth-like activated carbon. The speaker according to claim 1, wherein a ventilation cover is provided at a sound emission port of the speaker housing, and a second ventilation port of the ventilation path is connected to an inner surface side of the ventilation cover. The speaker according to claim 1 , wherein the cover constituting the air passage has an adhesive surface. The speaker according to claim 6 , wherein the cover constituting the ventilation path is constituted by a double-sided tape, and a ventilation cover is adhered and integrated to the outer surface side of the double-sided tape. A portable device in which the speaker according to any one of claims 1 to 7 is mounted in a main body casing. The portable device according to claim 8 which is connected with the sound emission opening of the speaker enclosure, the sound emission opening of the main housing. The shock absorbing member is mounted on the sound output port peripheral portion of the speaker housing outer, and sound emitting port of the speaker enclosure to the impact cushion, to claim 9 having an opening connecting the sound emitting port of the main housing The portable device described. A main body housing having a sound emission opening; and a speaker mounted in the main body housing. The speaker is coupled to the speaker housing, a diaphragm provided in the speaker housing, and the diaphragm. The voice coil and a magnetic circuit disposed in the magnetic gap, and a sound emission port is formed in a speaker housing portion in contact with one surface side of the diaphragm. A vibration load suppressing body is provided in the speaker housing in contact with the surface side, and the first air vent of the air passage is connected to the acoustic downstream side of the vibration load suppressing body viewed from the other surface side of the diaphragm, and this air passage The second air vent is connected to the outside of the speaker housing, and the air passage is constituted by a narrow groove provided on the outer surface side of the speaker housing and a cover covering the outer surface side of the speaker housing of the narrow groove. The cover that forms the ventilation path is the first double-sided tape. A ventilation cover that covers the sound outlet of the speaker housing is attached and integrated on the outer surface of the speaker housing of the first double-sided tape, and the second outer surface of the speaker housing is attached to the outer surface of the speaker housing. A portable device in which an impact buffer disposed on the outer periphery of the sound outlet outside the speaker housing is pasted and integrated on the outer surface of the speaker housing of the second double-sided tape.

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