JP2002094631A - Portable communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to achieve the weight reduction and thinning of a portable communication device and to reduce the price by the curtailment of the number of parts, by making the most of a wiring board stored in the casing of a portable communication device such as a portable telephone or the like, as the frame of an electric sound converter such as a speaker or the like. SOLUTION: In a portable communication device, a speaker 20 where a voice coil 26 with a diaphragm 21 is inserted in the gap G within a magnetic circuit is stored in the casing. A lead wire 27 drawn out of the voice coil 26 is connected directly to the electrodes 13 and 14 of the wiring board 10. The periphery of the diaphragm 21 is fixed to the wiring board 10. The magnetic circuit is made of a magnet 24, a pole piece 25, and a yoke 22. The yoke 22 is attached to the wiring board 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a portable communication device such as a portable telephone.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 9-163436, 10-42383, and No. 2931588 disclose a case in which a housing accommodates a wiring board and a speaker (or receiver) attached to the wiring board. Japanese Patent Application Laid-Open No. H11-331337 describes a pager in which a housing accommodates a wiring board and a speaker attached to the wiring board.

FIG. 5 schematically shows the structure of a conventional speaker used in a portable communication device such as a portable telephone or a pager. The speaker shown in FIG. 5 has a form as a unit component. That is, by attaching the metal frame 2 and the pole piece 4 to the different poles of the magnet 1, the frame 2 has a function as the yoke 3, and the gap G in the magnetic circuit formed by these three members is A voice coil 6 provided on a diaphragm 5 made of a diaphragm is inserted. The outer periphery of the diaphragm 5 is fixed to the outer periphery of the frame 2, and the outer periphery of the metal shield cover 7 provided so as to cover the diaphragm 5 is attached to the outer periphery of the frame 2. Fixed.

Conventionally, a speaker as a unit component as described with reference to FIG. 5 has been mounted on a wiring board and housed in the housings of the various portable communication devices described above.

[0005]

However, when a speaker as a unit component is mounted on a wiring board as in a conventional portable communication device, an extra fixing component for fixing the speaker to the wiring board is required. Not only become
Since the frame 2 serving as the yoke 3 is heavy, the weight of the speaker, and hence the weight of the portable communication device, may be heavy, and it may be difficult to reduce the thickness of the portable communication device, and portability may be impaired. was there.

In view of the above situation, the present invention has been made based on the idea that a wiring board housed in a housing of a portable communication device performs the above-described function of the frame. In other words, the present invention is not to mount the speaker as a unit component on the wiring board, but to use the wiring board as one component of the speaker.
It is an object of the present invention to provide a portable communication device that can omit the above-mentioned fixed parts and the frame of the speaker, which are conventionally required.

Another object of the present invention is to provide a portable communication device in which weight and thickness can be easily reduced by omitting fixed parts and a speaker frame.

A further object of the present invention is to reduce the weight and thickness of a portable communication device having an electro-acoustic transducer for transmitting and receiving signals such as a speaker and a microphone, and to reduce the cost by reducing the number of parts.

[0009]

A portable communication device according to the present invention includes the portable telephone and the pager described above, and a voice coil provided on a diaphragm is inserted into a gap in a magnetic circuit. The electroacoustic conversion device is housed in a housing. The electroacoustic transducer includes a dynamic type speaker or microphone.

In the present invention, the end of the lead wire drawn from the voice coil is directly connected to an electrode formed on a wiring board housed in the housing,
An outer peripheral portion of the diaphragm is fixed to the wiring board.
With this configuration, since the outer peripheral portion of the diaphragm is fixed to the wiring board housed in the housing, the wiring board can have a function as a frame of the electroacoustic apparatus, and so on. As a result, the frame 2 described with reference to FIG. 5 can be omitted, so that the portable communication device can be easily reduced in weight and thickness, and its portability can be improved. In addition, since the wiring board is diverted as one component of the electroacoustic transducer, there is no need to mount the electroacoustic transducer as a unit component on the wiring board. As a result, the fixed parts described at the beginning are not required, and the number of required parts is reduced in combination with the fact that the frame can be omitted.

According to the present invention, the magnetic circuit constituting the magnetic circuit comprises a magnet, a pole piece and a yoke attached to the magnet, and the yoke is attached to the wiring board. A configuration can be employed. By doing so, the yoke is made smaller than that described with reference to FIG. 5 and the electroacoustic transducer can be easily reduced in weight and thickness, so that the portable communication device can be easily reduced in thickness and weight. Become.

In the present invention, it is desirable that the yoke is fitted in a hole formed in the wiring board in a fitted state. According to this, the yoke can be attached to the fixed position of the wiring board functioning as a frame with high precision, so that the acoustic characteristics are stabilized accordingly, and at the same time, only the dimension corresponding to the fitting allowance of the yoke to the hole of the wiring board It is easy to achieve the reduction in the thickness of the electroacoustic transducer, which helps to promote the reduction in the thickness of the portable communication device.

In the portable communication device according to the present invention, it is preferable that the portable communication device has a shield cover provided so as to cover the diaphragm, and the shield cover is fixed to the wiring board. According to this, since the wiring board functions as a shield cover supporting member, an extra member for supporting the shield cover becomes unnecessary. When this configuration is employed, a pattern electrode having a shape corresponding to the shape of the outer peripheral portion of the shield cover is formed on the wiring board, and the outer peripheral portion of the shield cover superimposed on and in contact with the pattern electrode is formed. It is desirable to be soldered to the pattern electrode. By doing so, the shielding performance of the shield cover is exhibited well.

[0014]

FIG. 1 shows a rigid wiring board (PCB) 10 housed in a housing (not shown) of a portable telephone as a portable communication device according to the present invention. Is a speaker having the wiring board 10 as one component, 30 is a display mounted on the wiring board 10, 40 is an operation keypad mounted on the wiring board 10, and 80 is a microphone mounted on the wiring board 10. It is.

As shown in detail in FIG.
Is a dynamic type, in which the outer periphery of a circular diaphragm 21 made of a diaphragm is fixed to the surface of the wiring board 10. As a means for fixing the outer peripheral portion of the vibration plate 21 to the surface of the wiring board 10, a means such as sticking with an adhesive can be appropriately employed. A circular hole 12 is formed in the wiring board 10, and a stepped annular portion 23 provided on the outer periphery of a small metal yoke 22 is fitted into the hole 12. In that state, the yoke 22
Are attached to the wiring board 10 by appropriate means such as sticking using an adhesive. Reference numeral 24 denotes a magnet. The yoke 22 and the pole piece 25 are attached to the magnet 24. A magnetic circuit is formed by the magnet 24, the yoke 22, and the pole piece 25. A gap G formed in the magnetic circuit has
The voice coil 26 attached to the diaphragm 21 is inserted. The ends of the lead wires 27 drawn from the voice coil 26 are directly connected to the electrodes 13 and 14 formed on the surface of the wiring board 10 by soldering.

Reference numeral 50 denotes a shield cover which is large enough to cover the diaphragm 21 and has an outer peripheral portion formed with a flanged terminal 51 having a partially circular shape protruding outward. On the other hand, as shown in FIG. 3, a circular ground pattern electrode 15 corresponding to the outer peripheral portion of the shield cover 50, specifically, the shape of the flange-shaped terminal 51 is formed on the surface of the wiring board 10. The flange-shaped terminal 51 is superimposed on the pattern electrode 15. In addition, a required number (two in the illustrated example) of soldering pieces 51a and 15a are provided on the flange-shaped terminal 51 and the pattern electrode 15, and the pieces are soldered together as shown in FIG. 52 fixed.

The wiring board 10 is provided with a sound leakage hole 16 at a position facing the diaphragm 21, and the sound leakage hole 16 is covered with an acoustic correction cloth 60. The shield cover 50 is provided with a sound hole 55.

In the portable telephone provided with the speaker 20 described above, the wiring board 10 functions as a frame of the speaker 20, and a small yoke 22 is attached to the wiring board 10. The combined weight of the wiring board 10 and the yoke 22 is lighter than the frame 2 functioning as the yoke 3 described with reference to FIG. 5, and the yoke 22 that does not need to have the function of the frame is thin. It is also possible to convert. Therefore, the portable communication device of this embodiment is lighter and thinner than the conventional portable communication device, and the portability is improved. Moreover,
Since the wiring board 10 is diverted as one component of the speaker 20, the speaker 20 is fixed to the wiring board 1 by using a fixed component.
There is no need to mount it on a 0. Further, since the shield cover 50 is also fixed to the wiring board 10, the wiring board 10 functions as a shield cover supporting member.

In this embodiment, the present invention is applied to a speaker 20.
Although the example applied to the microphone 80 has been described, the microphone 80
Also forms the same electro-acoustic transducer as the speaker 20, so that the present invention can be applied to the microphone 80.

[0020]

According to the present invention, the wiring board housed in the housing of the portable communication device functions as a frame of an electroacoustic conversion device such as a speaker or a microphone. The frame of the device can be omitted. Therefore, the weight and thickness of the portable communication device can be easily reduced, and the cost can be reduced by reducing the number of components.

[Brief description of the drawings]

FIG. 1 is a plan view showing a wiring board, a speaker, and the like used in a mobile communication device according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a speaker.

FIG. 3 is a plan view showing a pattern electrode and the like.

FIG. 4 is an explanatory view exemplifying means for fixing a shield cover to a wiring board;

FIG. 5 is a longitudinal sectional view of a speaker used in a conventional portable communication device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wiring board 12 Hole part 13, 14 electrode 15 Pattern electrode 20 Speaker (electroacoustic transducer) 21 Diaphragm 22 Yoke 24 Magnet 25 Pole piece 26 Voice coil 27 Lead wire 50 Shield cover G Gap in magnetic circuit

Claims (5)

[Claims] 1. A portable communication device in which an electroacoustic transducer in which a voice coil provided on a diaphragm is inserted into a gap in a magnetic circuit is housed in a housing, wherein a lead wire drawn from the voice coil is provided. Wherein the end of the diaphragm is directly connected to an electrode formed on a wiring board housed in the housing, and the outer periphery of the diaphragm is fixed to the wiring board. apparatus. 2. The magnetic circuit according to claim 1, wherein the magnetic circuit component forming the magnetic circuit comprises a magnet, a pole piece and a yoke attached to the magnet, and the yoke is attached to the wiring board. Mobile communication device as described. 3. The portable communication device according to claim 2, wherein the yoke is fitted in a hole formed in the wiring board in a fitted state. 4. The portable communication device according to claim 1, further comprising a shield cover provided so as to cover said diaphragm, wherein said shield cover is fixed to said wiring board. 5. A pattern electrode having a shape corresponding to the shape of the outer peripheral portion of the shield cover is formed on the wiring board, and the outer peripheral portion of the shield cover superimposed on and in contact with the pattern electrode is formed on the pattern electrode. The mobile communication device according to claim 4, wherein the mobile communication device is soldered.