JP3431001B2 - Communication equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a mobile phone, PHS.
The present invention relates to portable communication devices such as.

[0002]

2. Description of the Related Art The structure of a receiver of a mobile phone will be described below with reference to FIGS. FIG. 11 is a cross-sectional view of the earpiece, and FIG. 12 is a perspective view showing a cushion member. As shown in FIG. 11, the mobile phone has a case 1, a printed circuit board 2, a speaker (sounding body) 3, and a cushion member (shock protection member) 4. Case 1 is the upper case 1
The printed circuit board 2 is provided in the case 1 together with the speaker 3 and the cushion member 4 by being configured by combining the a and the lower case 1b.

The speaker 3 is arranged between the printed board 2 and the lower case 1b, and has a disk-shaped case 3a and a diaphragm 3.
b and duct 3c. The diaphragm 3b is
The duct 3c is disposed in the disk-shaped case 3a, and is formed so as to project from the upper surface of the disk-shaped case 3a through the through hole 2a of the printed circuit board 2 toward the through hole portion 1c of the upper case 1a. As a result, the sound from the diaphragm 3b of the speaker 3 is output from the through hole 1c of the upper case 1a through the disc-shaped case 3a and the duct 3c.

As shown in FIG. 12, the cushion member 4 is formed in a ring shape and has a lower surface 3d of the disk-shaped case 3a.
It is arranged between the outer peripheral portion of and the lower case 1b. As a result, the cushion member 4 can protect the speaker 3 from an impact.

[0005]

By the way, when the frequency characteristics of the sound output from the through-hole 1c of the upper case 1a in the above-mentioned portable telephone is examined, it is found that the rear side of the speaker 3 is in an open state. In comparison, it was found that the sound quality was deteriorated. When frequency analysis was performed in an experiment, it was found that the output intensity remarkably decreased from 600 Kz to 4 Kz. Then, when the cause of the deterioration of the frequency characteristic was examined, the following was found.

First, the cushion member 4 forms a closed space 4a shown in FIG. 12 together with the lower surface 3d of the disk-shaped case 3a and the lower case 1b. A through hole 3e is formed in the lower surface 3d of the disk-shaped case 3a, and this through hole 3e communicates with the closed space 4a. Therefore, the sound from the diaphragm 3b of the speaker 3 is output from the through hole 3e into the closed space 4a.

Here, in the closed space 4a, even if sound is output from the speaker 3 through the through hole 3e, movement of air is restricted. Therefore, the vibration of the diaphragm 3b of the speaker 3 is limited due to the limitation of the movement of the air, resulting in a situation in which a clear sound cannot be obtained.

In view of the above points, an object of the present invention is to provide a communication device capable of suppressing the sound from the sounding body from being deteriorated by the impact protection member.

[0009]

In order to achieve the above object, the present invention provides a rectangular shape in the invention described in claim 1.
A case (10) formed, a sounding body (40) arranged in the case for outputting sound from the front side of the case, and arranged between the back side portion (10b) of the case and the sounding body. Is
An impact protection member (70) for protecting the sounding body from impact is formed. The shock protection member forms a space (71) between the back side portion of the case and the sounding body, and air moves from the space. The impact protection member having an opening (72)
Is arranged on one side in the longitudinal direction of the case,
The opening of the protective member faces the other side in the longitudinal direction of the case.
There is characterized in that is.

Thus, in the space between the back side of the case and the sounding body, the air can freely move through the opening, so that a clear sound can be obtained from the sounding body.

[0011]

According to the second aspect of the present invention, since the impact protection member is formed in a semicircular shape, the function as the impact protection member can be further exerted.

Incidentally, the reference numerals in the parentheses of the above-mentioned means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention shown in the drawings will be described. 1 and 2 show an embodiment of the present invention. 1 is a perspective view showing a mobile phone, and FIG. 2 is a perspective view showing a cushion member.

As shown in FIG. 1, the mobile phone has a rectangular case 10 and a liquid crystal panel 20. Further, as shown in FIG. 2, the mobile phone has a printed circuit board 30, a speaker (sounding body) 40, a duct cushion member 50, a shield case 60, and a cushion member (shock protection member).
70 is provided. As shown in FIG. 1, the case 10
Is an upper case 10a and a lower case (back side portion) 10
It is configured by combining b.

As shown in FIG. 2, a horizontal bottom wall 11 and an inclined bottom wall 12 are formed on the lower case 10b, and the horizontal bottom wall 11 is located at one end side in the longitudinal direction of the case 10. The inclined bottom wall 12 is formed to be inclined toward the other end side in the longitudinal direction from the position 11a where the dimension from the upper case 10a is larger than the horizontal bottom wall 11 so that the dimension becomes larger. .

Here, a through hole portion 14 is formed in the upper case 10a, and the through hole portion 14 is formed in the horizontal bottom wall 1.
Located opposite to 1. The through hole 14 is the speaker 40.
It plays a role of transmitting the sound (received sound) output from the outside of the case 10. As shown in FIG. 1, the liquid crystal panel 20
Is housed in the case 10 and is located in a substantially rectangular opening 13 of the upper case 10a. The opening 13 is located on the other end side in the longitudinal direction with respect to the through hole 14 of the upper case 10a. To do.

As shown in FIG. 2, the printed circuit board 30 is
It is housed in the case 10 and has a through hole 31. The through hole 31 faces the through hole portion 14 of the upper case 10a. The speaker 40 is arranged between the printed circuit board 30 and the lower case 10b. The speaker 40 faces a part of the horizontal bottom wall 11 and the inclined bottom wall 12 (hereinafter, referred to as the facing inclined wall 12a). Speaker 4
0 forms a space 45 with the opposed inclined wall 12a.

The speaker 40 comprises a disc-shaped case 41, a diaphragm 42, and a duct 43. The diaphragm 42 is
It is housed in the disc-shaped case 41 and vibrates in response to an input signal to generate sound. The duct 43 is formed so as to penetrate from the disc-shaped case 41 into the through hole 31 of the printed circuit board 30 and project toward the through hole portion 12 of the upper case 10a. Thereby, the duct 43 plays a role of transmitting the sound generated from the diaphragm 42 to the through hole 12 of the upper case 10a.

Here, a through hole 44 is formed on the lower side (back side) in the figure of the disk-shaped case 41, and the through hole 44 is formed.
Communicates with the void 45 and transmits the sound generated from the diaphragm 42 to the void 45.

The duct cushion member 50 is disposed between the upper case 10a and the printed circuit board 30, and is formed in a tubular shape so as to cover the duct 43. The duct cushion member 50 is formed from the duct 43 to the case 1
It plays the role of preventing the sound from leaking into 0. Note that FIG.
Inside 51 is a dustproof cloth.

The shield case 60 is arranged between the speaker 40 and the printed circuit board 30, and forms a space 61 between itself and the lower case 10b. However, the speaker 40 is attached to the shield case 60 with the double-sided tape 62.

The cushion member 70 includes the lower case 10b.
Is disposed between the horizontal bottom wall 11 and the speaker 40, and supports the speaker 40 and the speaker 4
It serves to protect 0 from shock. Cushion member 7
Reference numeral 0 denotes a sponge, which is fixed to the horizontal bottom wall 11 of the lower case 10b by a double-sided tape.

Specifically, the cushion member 70 is shown in FIG.
As shown in (d), the ring-shaped member is partially provided with a notch (the hatched portion in FIG. 4D is a notched part), and the notched part is the ring-shaped member. Corresponding to 180 ° with respect to the radial center point.
The cushion member 70 is formed in a semi-ring shape having an opening 72.

Here, the cushion member 70 is located between the back side outer peripheral portion 41a of the disk-shaped case 41 of the speaker 40 and the horizontal bottom wall 11 of the lower case 10b. As a result, the cushion member 70 is located on one end side in the longitudinal direction of the case 10, and the opening 72 is arranged toward the other end side in the longitudinal direction as shown in FIG.

However, the cushion member 70 is the speaker 4
0 and the horizontal bottom wall 11 of the lower case 10b form a void 71 shown in FIG.
The disc-shaped case 41 communicates with the through-hole portion 44.

The operation of this embodiment will be described below. The diaphragm 42 of the speaker 40 responds to an electric signal by
When a sound is generated, the sound is transmitted to the outside of the case 10 through the duct 43 and the through hole 12 of the upper case 10a.

Here, the sound from the diaphragm 42 is transmitted from the inside of the disk-shaped case 41 to the void 71 through the through hole 44, and the sound transmitted to this void 71 is passed through the opening 71 of the cushion member 70 to the void. After 45, it is transmitted to the void 61. At the same time, the sound from the diaphragm 42 is transmitted from the inside of the disk-shaped case 41 to the void 45 through the through hole 44, and the sound transmitted to the void 45 is transmitted to the void 61.

As described above, as the cushion member 70, the shape (half ring shape) in which the ring member is provided with the notch is adopted, and the speaker 40 does not form a closed space together with the cushion member 70 and the lower case 10b. Here, the cushion member 70 is arranged at one end side in the longitudinal direction of the case 10, and the opening 72 of the cushion member 70 is
The case 10 is arranged toward the other end side in the longitudinal direction.

As a result, the sound from the through hole 44 of the speaker 40 can be transmitted not only to the void 45 but also to the void 61 by the opening 72 of the cushion member 70. Therefore, the opening 72 of the cushion member 70 serves as an air escape path from the void 71 to the void 45. Therefore, in the cushion member 70 and the spaces 45 and 71, the degree of freedom of air movement can be increased, so that the vibration of the diaphragm 42 of the speaker 40 is not restricted, and no clear sound is produced. Can be obtained.

Below, as the cushion member 70, a ring member in which cut portions having different shapes are formed is employed, the frequency characteristics of sound are measured, and the measurement results are shown in FIGS. 4 (a) to 4 (e). Will be described with reference to FIGS.

In this measurement, as the cushion member 70, a ring member provided with a cutout portion having a width of 2 mm shown in FIG. 4A and a cushion member having a cutout portion having a width of 5 mm shown in FIG. 4B are provided. 4A, a cut portion corresponding to an angle of 90 ° with reference to the radial center point shown in FIG. 4C, a cut portion corresponding to an angle of 180 ° shown in FIG. Angle 270 shown in (e)
The one with a notch corresponding to ° was adopted.

However, the ring member has an inner diameter of φ1.
1mm, external dimensions φ15mm, thickness 1mm. In addition, in FIGS. 4A to 4E, the hatched portion is a cut portion.

5 to 10, the vertical axis represents output intensity and the horizontal axis represents frequency. FIG. 5 shows frequency characteristics when the ring member shown in FIG. 4 (a) is adopted, and FIG. Four
Frequency characteristics when the ring member shown in (b) is adopted,
FIG. 7 is a frequency characteristic when the ring member shown in FIG. 4C is adopted, FIG. 8 is a frequency characteristic when the ring member shown in FIG. 4D is adopted, and FIG. 10) shows frequency characteristics when the ring member shown in FIG. 10 is adopted, and FIG. 10 shows frequency characteristics when the back side of the speaker 40 is opened.

According to such frequency analysis, as shown in FIGS.
The frequency characteristic shown in FIG. 7 is 600 Hz to when compared with the case where the back side of the speaker 40 is opened (see FIG. 10).
It was found that although the output intensity was reduced at 4 KHz, the frequency characteristics shown in FIGS. 8 and 9 were equivalent to those when the back side of the speaker 40 was opened (see FIG. 10).

Therefore, in obtaining a clear sound from the speaker 40, the cushion member 70 has an inner diameter of φ1.
A ring-shaped member having a size of 1 mm, an outer diameter of φ15 mm, and a thickness of 1 mm is preferably provided with a notch corresponding to an angle of 180 ° or more.

Unlike the above experiment, the cushion member 70 has an inner diameter of 11 mm and an outer diameter of 15 m.
As a result of investigating the frequency characteristics by using a ring-shaped member having a thickness of 0.5 mm and a thickness of 0.5 mm, it was found that a member provided with a notch corresponding to an angle of 270 ° or more was preferable.

By the way, a drop test (falling distance: 1 m, with respect to a mobile phone employing the cushion member 70 shown in FIG.
1.5 m), no damage or failure occurred in the mobile phone. Therefore, if the semi-ring cushion member 70 shown in FIG. 8 is adopted, the quality of the sound from the speaker 40 can be improved while playing the role of the cushion member 70 as an impact protection member.

In the above embodiment, an example in which the cushion member 70 is applied to a mobile phone has been described, but the present invention is not limited to this, and the cushion member 70 can be carried such as a PHS, a cordless phone, a small radio device or a small information terminal. It may be applied to various communication devices.

Further, in carrying out the present invention, not only a speaker which produces a received sound, but also a sounding body applied to a communication device can be applied to a ringing tone generating section which produces a ringing tone.

Further, in the above-described embodiment, an example in which the cushion member 70 has a semi-ring shape shown in FIG. 4D has been described. However, the cushion member 70 is not limited to this, and the cushion member 70 has a lower side. Case 10b and speaker 4
It is sufficient not to form a closed space with 0.

For example, as the cushion member 70, a plurality (or one) of columnar sponge members are prepared, and the columnar sponge members are provided in the through holes of the speaker 40 between the speaker 40 and the lower case 10b. You may make it arrange | position so that the part 44 may be avoided.

[Brief description of drawings]

FIG. 1 is a perspective view showing a mobile phone according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

FIG. 3 is a perspective view showing a cushion member shown in FIG.

4A to 4E are top views showing cushion members having different shapes.

5 is a diagram showing frequency characteristics of sound when the cushion member shown in FIG. 4 (a) is adopted.

6 is a diagram showing frequency characteristics of sound when the cushion member shown in FIG. 4 (b) is adopted.

FIG. 7 is a diagram showing frequency characteristics of sound when the cushion member shown in FIG. 4 (c) is adopted.

8 is a diagram showing frequency characteristics of sound when the cushion member shown in FIG. 4 (d) is adopted.

9 is a diagram showing frequency characteristics of sound when the cushion member shown in FIG. 4 (e) is adopted.

FIG. 10 is a diagram showing frequency characteristics of sound in a speaker alone.

FIG. 11 is a cross-sectional view of an earpiece of a mobile phone according to a conventional technique.

12 is a perspective view showing the cushion member shown in FIG. 11. FIG.

[Explanation of symbols]

10 ... Case, 40 ... Speaker, 70 ... Cushion member.

Claims (2)

(57) [Claims] 1. A case (10) formed in a rectangular shape, a sounding body (40) arranged in the case for outputting sound from a front side of the case, and a rear side portion (10b) of the case. ) And the sounding body, and a shock protection member (70) for protecting the sounding body from a shock, the shock protection member is provided between the back side portion of the case and the sounding body. It forms an empty space (71) and has an opening (72) through which air moves from the empty space, and the impact protection member is arranged on one side in the longitudinal direction of the case.
The impact protection member opening is
A communication device characterized by facing the other side in the hand direction . 2. The communication device according to claim 1 , wherein the impact protection member is formed in a semicircular shape.