JP2001309007A - Sound transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To narrow an installation space of a portable telephone set handset in the longitudinal direction of the casing and to form a large display of a character picture display element in the casing. SOLUTION: A sound path is formed on the side wall of the housing of a sound transducer used as a receiver or a microphone. The sound transducer is arranged in an erected posture in the casing of the elongated handset. Thus, the sound path of a housing is confronted with the sound hole of a casing side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroacoustic transducer used as a receiver (speaker) or a microphone.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a conventional example of an electro-acoustic transducer A, and FIG. 8 is a view showing the electro-acoustic transducer A of FIG. 7 mounted on a casing 100 of a handset of a mobile communication device. Is shown. The electro-acoustic transducer A of FIG. 7 has a sound path 2 on the front surface of a flat housing 1, and the electro-acoustic transducer A has a circular shape in a front view. Further, inside the flat housing 1, a magnet, a yoke, a pole piece, a diaphragm having a voice coil and the like are housed, and a part of the yoke protrudes to the rear side of the housing 1. Reference numeral 3 denotes a yoke that protrudes to the rear side of the housing 1. This electroacoustic transducer is a dynamic type, and when used as a receiver, sound generated by vibration of the diaphragm goes out of the sound path 2 to the outside of the housing, whereas when used as a microphone, the sound path 2
The diaphragm vibrates together with the voice coil due to the sound that has entered the inside of the housing 1 from above, and the sound is converted into an electric signal.

In the conventional electroacoustic transducer A, the sound path 2 is formed on the front surface of the housing 1 as described above. for that reason,
When the electro-acoustic transducer A is used as a receiver component or a microphone component of a mobile communication device such as a mobile phone, by mounting the electro-acoustic transducer A inside the casing 100 of the handset of the mobile communication device as shown in FIG. The sound passage 2 (see FIG. 7)
The sound hole 112 formed in the thin and long wall portion 110 of FIG. That is, in the case of FIG. 8, the fitting frame portion 113 provided on the inner surface side of the elongated wall portion 110 of the casing 100 formed in a flat and elongated hollow box shape.
Then, the front surface of the housing 1 is set to the wall portion 110 side,
The sound path 2 is made to face the sound hole 112 by fitting. In FIG. 8, reference numeral 114 denotes a wiring board;
Reference numerals 15 and 116 denote terminals made of coil springs for connecting the voice coil and the circuit on the wiring board 114 side.

[0004]

As shown in FIG. 8, the casing 1 of the handset is placed in a posture in which the electro-acoustic transducer A is laid down.
00, a space corresponding to at least the outer diameter of the electroacoustic transducer A or the housing 1 is required as the installation space S1 of the electroacoustic transducer A in the longitudinal direction of the casing 100. On the other hand, the casing 100
In some cases, a relatively large dead space D is formed at the back of the electro-acoustic transducer A attached to the motor.

In recent mobile communication devices, the casing 100 has been reduced in size and weight, while the display surface of a character image display element (such as a liquid crystal display) has been made as large as possible. It has been attempted to equip 110 or the like.

However, when the sound passage 2 is formed on the front surface of the housing 1 as in the conventional electroacoustic transducer A, in order to make the sound passage 2 face the sound hole 112 on the casing 100 side, Since it is absolutely necessary to mount the electro-acoustic transducer A on the casing 100 as described above, the installation space of the display surface of the character image display element is narrowed by the installation space S1 of the electro-acoustic transducer A. There was a situation that would go away. As described above, conventionally, due to the structure of the electro-acoustic transducer A provided in the electro-acoustic transducer A, the display surface of the character image display element provided in the casing of a mobile communication device such as a mobile phone. Was limited.

The present invention has been made in view of the above circumstances, and is provided in a housing without securing a large installation space for the electroacoustic transducer in the longitudinal direction of a casing of a mobile communication device. It is an object of the present invention to provide an electro-acoustic transducer in which a sound path provided can face a sound hole formed in a wall of the casing.

Further, the present invention makes it possible to reduce the installation space of the electroacoustic transducer in the longitudinal direction of the casing of the mobile communication device as much as possible, thereby increasing the display surface of the character image display element. It is an object of the present invention to provide an electro-acoustic transducer that can easily perform the operation.

[0009]

The electroacoustic transducer of the present invention will be described with reference to the drawings. The use of reference numerals in the figures in this section is for the purpose of helping to understand the contents of the invention, and is not intended to limit the contents to the examples in the drawings.

The electroacoustic transducer according to the present invention has a housing 16
Is divided into an outer space E1 and an inner space E2 by a diaphragm 14, and the housing 16 is provided with a sound passage 19 communicating the outer space E1 and the outside of the housing 16. This type of electro-acoustic transducer is of the dynamic type,
Used as a receiver or microphone. And
When used as a receiver, the sound path 19 serves as a sound output path for emitting sound generated by the vibration of the diaphragm 14 to the outside of the housing 16, and when used as a microphone, the sound path 19 converts the sound It serves as a passage for sound to be introduced inside.

In the present invention, the casing 16 has a side wall 18 surrounding the periphery of the diaphragm 14 and the side wall 1
8 is provided with the sound passage 19. According to this electroacoustic transducer, when used as a receiver, sound generated by the vibration of the diaphragm 14 is emitted to the side of the housing 16 through the sound passage 19 in the side wall of the housing 16, and
When used as a microphone, sound
Is introduced into the housing 16 through the sound passage 19 of the side wall portion 18 of FIG.

When the electro-acoustic transducer according to the present invention is mounted on a casing 100 of a device such as a mobile communication device, the sound passage 19 is provided so as to face a sound hole 112 formed in the casing 100 of the device. is necessary. Therefore, the sound passage 19 forms an opening that is provided to face the sound hole 112 formed in the casing 100 of the device to which the electroacoustic transducer is mounted.

The above devices include mobile communication devices such as mobile phones. In addition, the casing of such a mobile communication device includes a casing of a handset of the mobile communication device.

When the casing is a casing of a handset of a mobile communication device, the casing 100 is
It is formed in an elongated hollow box shape having an elongated wall portion 110 and an end wall portion 130 connected to a longitudinal end portion of the wall portion, and the sound hole 112 is formed at a longitudinal end portion of the wall portion 110. It may be formed. Such a casing 100
In contrast, the housing 16 is provided at a longitudinal end portion in the casing 100, and the side wall portion 18 of the housing 16 is provided.
Are arranged facing the wall 110 of the casing. Therefore, the electro-acoustic transducer A is provided in the elongated casing 10.
As a result, the space for the electroacoustic transducer in the longitudinal direction of the casing 100 is required to have a space corresponding to the thickness dimension of the electroacoustic transducer. It just becomes. Therefore,
Compared with the related art, the installation space for the electro-acoustic transducer in the longitudinal direction of the casing is reduced, and accordingly, the installation space for the display surface of the character image display element is increased.

In the present invention, the end wall portion 13 of the casing is provided.
Even if the housing 16 is provided at a longitudinal end in the casing 100 such that the diaphragm 14 is in a posture along with the diaphragm 14 with respect to the end wall 130 of the casing, The housing 16 may be provided at a longitudinal end in the casing 100 so that the attitude of the housing 14 is inclined. Among them, the former allows the installation space of the electroacoustic transducer A in the longitudinal direction of the casing 100 to be narrower than the latter. The latter is
The installation space for the electroacoustic transducer in the thickness direction of the casing 100 can be made smaller than the former.

FIG. 9 shows Japanese Patent Application No. 11-33082.
1 shows the use state of the electro-acoustic transducer A proposed by No. The electro-acoustic transducer A is laid down inside a casing 100 of a mobile phone handset, and a sound path 2 provided on a front surface of the housing 1 faces a sound hole 112 of the casing 100. . Further, the electro-acoustic transducer A has a leak hole 5 opening toward the side thereof.
The casing 100 has an opening 6 facing the leak hole 5, but the leak hole 5 is provided to improve the bass characteristics of the electro-acoustic transducer A. Therefore, it exerts an effect different from that of the sound passage. Further, it differs from the sound path of the electroacoustic transducer of the present invention also in that the leak hole A communicates with the space inside the diaphragm 7.

FIG. 10 shows a use state of the electroacoustic transducer A described in Japanese Patent No. 2568401.
Also in this electroacoustic transducer A, in addition to the sound path 2 provided on the front surface of the housing, a leak hole 5 opening toward the side of the housing is provided. This is provided to improve the bass characteristics of the acoustic transducer A, and has an effect different from that of the sound path.

[0018]

FIG. 1 is a perspective view schematically showing an electro-acoustic transducer A according to an embodiment of the present invention, and FIG. 2 is a schematic view showing the internal structure of the electro-acoustic transducer A of FIG. Cross section,
FIG. 3 is a cross-sectional view schematically showing a state where the electroacoustic transducer A of FIG. 1 is attached to a casing 100 of a handset of a mobile communication device.

As shown in FIG. 2, the electroacoustic transducer A is of a dynamic type, and includes a magnet 11 and a pole piece 12.
The yoke 13, the diaphragm 14, and the voice coil 15 provided on the diaphragm 14 are housed in a housing 16. In the electro-acoustic transducer A, the housing 16 includes the housing 1 connected to the yoke 13 and the outer wall 13 a of the yoke 13.
7. As shown in FIG. 1, the housing 17 is rectangular when viewed from the front. Therefore, the housing 16 is also rectangular when viewed from the front. Also, as shown in FIG. 1 and FIG.
Is provided with a side wall 18 formed by an outer wall 13a of the yoke 13 and an outer wall 17a of the housing 17, and the side wall 18 surrounds the periphery of the diaphragm 14 (see FIG. 2).

As can be seen in FIG. 2, this electroacoustic transducer A
In the figure, the internal space of the housing 16 is separated from the outer space E1 and the inner space E2 by the vibration plate 14. The sound passage 19 formed at one location of the side wall portion 18 connects the outside space E1 to the outside of the housing 16. 1 and 2, the sound passage 19 is formed in the outer wall 17a of the housing 17, but this point is not limited to the case in which the sound path 19 is formed in the outer wall 13a of the yoke 13. It may be formed so as to straddle both the outer side wall 17a and the outer side wall 13a of the yoke 13.

In the electroacoustic transducer A described above,
The sound passage 19 is an opening provided to face a sound hole opened in a casing of a device to which the electroacoustic transducer A is attached. This will be described in detail below with examples.

A casing 100 shown in FIG. 3 is a casing of a handset of a portable telephone as an example of a mobile communication device. The casing 100 includes two opposing elongated walls 110 and 120 and the walls 110 and 120.
120 is formed in an elongated hollow box shape having an end wall portion 130 connected to an end portion in the longitudinal direction L. Such a casing 100 has a casing body 10 as shown in FIG.
It can be formed by attaching the cover 100b to the cover 0a. A sound hole 112 is formed at one end of the wall portion 110 on one side of the casing 100 in the longitudinal direction L.

As shown in FIG. 3, the electro-acoustic transducer A described with reference to FIGS. 1 and 2 is provided at a longitudinal end in the casing 100 in a standing posture. Then, the side wall 1 of the housing 16
8 is arranged to face the wall 110 of the casing 100, and a sound passage 19 (see FIG. 1 or 2) formed only at one location of the side wall 18 of the casing 16 is provided on the casing 100 side. The sound hole 112 is provided facing the sound hole 112.

The vinegar 3 is provided with an electroacoustic transducer A in a casing 1
The specific structure for attaching to the 00 is illustrated.
In this mounting structure, the outer edge of the housing 16 is fitted into fitting frames 141 and 142 provided integrally on the inner surfaces of the two walls 110 and 120, respectively. Further, a wiring board 150 is provided in a gap between the electro-acoustic transducer A and the end wall 130 of the casing 100, and the terminals 21 and 22 formed of a coil spring on the electro-acoustic transducer A side are connected to the wiring board 150. It is in elastic contact with the circuit. Note that the terminals 21 and 22 exert an action of electrically connecting the voice coil 15 of the electroacoustic transducer A and the circuit of the wiring board 150.

In the case of a portable telephone, the wall 110 of the casing 100 in which the sound hole 112 is formed is arranged beside the user's face during communication. When the sound hole 112 is a sound hole on the transmitting side, sound is introduced into the outer space E1 (see FIG. 2) of the housing 16 through the sound hole 112 and the sound passage 19, and If 112 is the receiving side sound hole,
The sound passes through the sound passage 19 and the sound hole 112, and
It is released outside 00.

In the example shown in FIG.
Diaphragm 14 of electro-acoustic transducer A with respect to end wall 130 of
The housing 16 is provided at a longitudinal end in the casing 100 such that the postures are substantially parallel.

According to the embodiment described above, as shown in FIG. 3, a space corresponding to the thickness of the electroacoustic transducer is required as the installation space S of the electroacoustic transducer A in the longitudinal direction L of the casing 100. It just becomes. Therefore, the installation space of the electro-acoustic transducer A in the longitudinal direction of the casing 100 is narrower than the case where the conventional electro-acoustic transducer A described with reference to FIG. 8 is used. Therefore, when the display surface of the character image display element is installed on the wall 110 of the casing 100, it is possible to secure a large installation space for the display surface.

FIG. 4 is a sectional view of an electroacoustic transducer A according to another embodiment. In the electro-acoustic transducer A shown in the figure, the shape of the housing 17 is different from that described in FIG. That is, in the housing 17 of the electroacoustic transducer A shown in FIG. 4, a part of the outer wall 17a in the circumferential direction is tall, and the sound passage 19 is formed in the tall wall 17b. Other configurations are the same as those described with reference to FIG. 2, and therefore, the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

Although not shown, the electro-acoustic transducer A of FIG. 4 is provided with the sound path 19 opposed to a sound hole formed in a casing of a handset of a mobile communication device. In this case, the side wall portion 18 of the casing 16 is disposed so as to face the wall portion of the casing, and the longitudinal end portion in the casing is arranged such that the diaphragm 14 is inclined with respect to the end wall portion of the casing. Deployed to. In addition, the casing of the mobile phone as described in FIG. 3 can be adopted as the casing.

Since the thickness T of the electro-acoustic transducer A described in FIG. 4 is larger than that described in FIGS. 1 to 3, the electro-acoustic transducer A is used as a receiver component of a portable telephone or When used as a microphone component, the installation space of the electro-acoustic transducer A in the longitudinal direction of the casing is wider than that described in FIG. 3, but the height dimension H of the electro-acoustic transducer A is shown in FIG. Since the height is smaller than the height H1 of the electroacoustic transducer A, there is an advantage that the installation space of the electroacoustic transducer in the thickness direction of the casing can be reduced.

FIG. 5 is a front view of an electroacoustic transducer A according to still another embodiment, and FIG. 6 is a view taken in the direction of arrow VI in FIG. The electroacoustic transducer shown in the figure has a horseshoe-like outer shape when viewed from the front, and a protrusion 31 protruding laterally from the center of the horseshoe-shaped arc, that is, the outer wall 18 of the housing 16.
The sound passage 19 is formed in the protrusion 31. This electroacoustic transducer A can be used in the same manner as the electroacoustic transducer described with reference to FIGS. FIG.
In FIG. 6, the same reference numerals are given to the same or corresponding portions as those described in FIGS.

[0032]

As described above, according to the present invention, even if the installation space for the electroacoustic transducer in the longitudinal direction of the casing of the mobile communication device is not so large, it can be provided in the housing. The sound path can be made to face a sound hole formed in the wall of the casing.
Therefore, the installation space for the electro-acoustic transducer in the longitudinal direction of the casing of the mobile communication device can be reduced as much as possible, whereby the display surface of the character image display element can be easily enlarged. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an electroacoustic transducer according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing an internal structure of the electro-acoustic transducer of FIG.

FIG. 3 is a cross-sectional view schematically showing a state where the electroacoustic transducer of FIG. 1 is attached to a casing of a handset of a mobile communication device.

FIG. 4 is a cross-sectional view of an electroacoustic transducer according to another embodiment.

FIG. 5 is a front view of an electroacoustic transducer according to still another embodiment.

FIG. 6 is a view taken in the direction of arrow VI in FIG. 5;

FIG. 7 is a schematic perspective view of a conventional electroacoustic transducer.

FIG. 8 is a cross-sectional view schematically showing a state in which a conventional electroacoustic transducer is attached to a casing of a handset of a mobile communication device.

FIG. 9 is a cross-sectional view illustrating a use state of a comparative example.

FIG. 10 is a cross-sectional view showing a usage state of another comparative example.

[Explanation of symbols]

 Reference Signs List 14 diaphragm 16 housing 18 side wall 19 sound passage 100 casing 110, 120 elongated wall 112 sound hole 130 end wall E1 outer space E2 inner space

Claims (6)

[Claims] 1. An electroacoustic transducer in which an inner space of a housing is partitioned into an outer space and an inner space by a diaphragm, and a sound passage communicating the outer space and the outside of the housing is provided in the housing. 2. The electroacoustic transducer according to claim 1, wherein the casing has a side wall surrounding the periphery of the diaphragm, and the sound path is provided in the side wall. 2. The electro-acoustic transducer according to claim 1, wherein the sound path is an opening arranged to face a sound hole formed in a casing of a device to which the electro-acoustic transducer is mounted. 3. The electro-acoustic transducer according to claim 2, wherein the device is a mobile communication device, and the casing is a casing of a handset of the mobile communication device. 4. The casing is formed in an elongated hollow box shape having an elongated wall portion and an end wall portion connected to a longitudinal end of the wall portion, and the sound hole is formed in the wall portion. The casing is provided at a longitudinal end in the casing, and the side wall of the casing is arranged to face a wall of the casing. Item 3. An electroacoustic transducer according to Item 3. 5. The electroacoustic according to claim 4, wherein the housing is provided at a longitudinal end portion in the casing such that the diaphragm is oriented along an end wall of the casing. converter. 6. The electroacoustic according to claim 4, wherein the casing is provided at a longitudinal end in the casing such that the diaphragm is inclined with respect to an end wall of the casing. converter.