JP2003023482A - Receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the receiver, having frequency versus sound pressure characteristics acoustic characteristics which fall within a prescribed frequency mask with a simple structural constitution and without installing a complicated circuit. SOLUTION: A receiver 3 is supported by a holder 5, and is set in an airtight state by the holder 5, a front spacer 6 and a back spacer 7. The receiver communicates with the outside of the holder 5 by a slit 8, formed in the front spacer 6 and a slit 9 formed in the back spacer 7. Consequently, acoustic air vibrations generated at the front and the back of the receiver 3 are mixed in the casing of the receiver through the slits 8 and 9. Since the phases of these acoustic air vibrations are inverted, the vibrations are mutually and offset canceled in the casing. Thus, sound pressure drops at the frequency of the acoustic air vibrations which offset with opposite phases.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a handset, and more particularly to a handset of a mobile phone.

[0002]

2. Description of the Related Art A handset of a mobile phone is a kind of speaker that electro-acoustically converts a voice signal to produce a voice,
It is preferable in terms of hearing that the acoustic characteristics are set as a frequency characteristic mask for obtaining a sound pressure range of 0 dB to 10 dB in a frequency band of 300 Hz to 1 kHz as shown in FIG. However, the current handset's frequency-to-sound pressure characteristic (acoustic characteristic) exceeds the upper limit sound pressure at frequencies near 500 Hz, as shown by the dotted line in FIG. 6, so it should be included in the frequency characteristic mask as it is. I can't. Therefore,
In the conventional handset, as a countermeasure, the input voice signal of the handset is corrected.

On the other hand, the frequency-to-sound pressure characteristic (acoustic characteristic) of the handset of the telephone is measured in the same state as when it is used in direct contact with the ear, but in actual use, it is used in close contact with the ear. Not only in the case, it may be used slightly away from the ear, in which case the low-frequency sensitivity of 60 to 200 Hz will be lower than the measurement state, so the diaphragm that is not likely to be blocked by the user holding the handset body A receiver that corrects low-frequency sensitivity by forming a leak hole that communicates with the space between the housing and the bottom of the housing has been conventionally known (Japanese Utility Model Laid-Open No. 7-25643).

Further, as a speaker device usable as a receiver, an airtight space is formed in a region surrounded by a damper movably supporting a voice coil bobbin and a magnetic circuit, and a magnetic circuit portion having a magnet and a rotor is provided. By providing a flow path that communicates the inside and the outside of the airtight space, the sensitive vibration of the vibration system is limited without increasing the mass of the diaphragm and the voice coil bobbin, and the resonance sharpness Qo at the lowest resonance frequency fo is lowered. There is known a speaker device capable of obtaining a good low frequency characteristic (Japanese Patent Laid-Open No. 11-8898).

[0005]

However, in the conventional handset in which the input voice signal of the handset is corrected by the correction circuit so as to be included in the frequency characteristic mask shown in FIG. 5, the frequency characteristic of the handset is uniform. Since such characteristic changes are not made, there is a problem that the correction circuit requires an advanced and expensive configuration using a digital signal processor (DSP) or the like.

Further, the conventional receiver described in Japanese Utility Model Laid-Open No. 7-25643 improves the low frequency sensitivity of 60 to 200 Hz, and the one described in Japanese Patent Laid-Open No. 11-8898 discloses a minimum resonance frequency fo. The resonance sharpness Qo in Fig. 6 was lowered so that good low frequency characteristics can be obtained. In both cases, 500 Hz shown by the dotted line in Fig. 6 was obtained.
It is not possible to correct the frequency-to-sound pressure characteristic that exceeds the upper limit at the midrange frequency in the vicinity.

The present invention has been made in view of the above points,
An object of the present invention is to provide a receiver having a frequency-to-sound pressure characteristic (acoustic characteristic) that falls within a predetermined frequency mask with a structurally simple configuration without providing a complicated circuit.

[0008]

In order to achieve the above-mentioned object, the present invention provides a receiver inside a hollow housing including a substrate, and pierces acoustic air vibration generated from the receiver in a front case of the housing. A sound receiver that emits sound through the sound hole, leaks acoustic air vibrations from both the front surface and the back surface of the receiver, which is supported in an airtight state by the holder, to the outside of the holder and into the housing. It is characterized by having a structure having means for mixing in the body.

In the present invention, the acoustic air vibration generated from the front surface of the receiver and the acoustic air vibration generated from the rear surface of the receiver are mixed in the housing of the handset by utilizing the fact that their phases are opposite to each other. By doing so, both acoustic air signals can be canceled.

Here, as the above-mentioned means, a structure including first and second spacers having slits respectively provided between the holder and the front case and between the holder and the substrate, the holder and the front case. A spacer provided with a slit and a leak hole formed in the substrate, a spacer having a slit provided between the holder and the substrate, the holder and the front case. Any of the configurations provided with a rib having a slit provided therebetween may be used.

The size of the slit is set so that the frequency-to-sound pressure characteristic is contained in a desired acoustic mask, and the desired acoustic mask is an acoustic mask in a mobile phone.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a sectional view of an embodiment of a receiver according to the present invention. A receiver according to the embodiment shown in the figure has a receiver 3 arranged in a hollow space between a front case 2 and a printed circuit board 1 on which a predetermined circuit is mounted and wiring is provided. . A sound hole 4 is formed at a position facing the receiver 3 of the front case 2. Further, the receiver 3 is a cylindrical vibrator that converts an audio signal into an electric sound, and the outer peripheral portion thereof is supported by the holder 5. The holder 5 is made of rubber, for example.

The upper end of the holder 5 is fixed to the front case 2 via a front spacer 6, and the lower end of the holder 5 is fixed to the printed board 1 via a rear spacer 7.
The front spacer 6 has a slit 8 and the back spacer 7 has a slit 9. Receiver 3 is holder 5
Originally, the front spacer 6 and the rear spacer 7 provide an airtight state, but in the present embodiment, the slit 8 formed in the front spacer 6 and the slit 9 formed in the rear spacer 7 prevent the outside of the holder 5. It is configured to communicate with.

FIG. 2 shows a top view of the front spacer 6 and the slit 8. The slit 9 formed in the back spacer 7 has the same configuration as that in FIG. 2, but the relative positional relationship between the slit 8 and the slit 9 is not particularly limited. However, the sizes of the slits 8 and 9 are set so that the actual frequency-to-sound pressure characteristic falls within the mask of the acoustic frequency characteristic shown in FIG. As in the conventional case, the sound produced by the receiver 3 is emitted through the sound hole 4 of the front case 2.

Next, the operation of this embodiment will be described. In FIG. 1, the air vibration (acoustic air vibration) of the sound produced by the receiver 3 leaks through the slits 8 and 9 to the receiver and a transmitter (not shown). This acoustic air vibration is generated by the diaphragm inside the receiver 3, but the phase is inverted between the front surface and the back surface of the receiver 3. As a result, the acoustic air vibrations leaking inside the receiver through the slits 8 and 9 inside the receiver are also inverted in phase.

Here, the effect of the frequency characteristic of the acoustic air vibration radiated from the sound hole 4 when the acoustic air vibration whose phase is inverted leaks and is coupled will be considered. Receiver 3
The air vibration output from the front of the
Is output to the handset through. At the same time,
The acoustic air vibration output from the back surface of the receiver 3 is output into the receiver through the slit 9.

As a result, the acoustic air vibrations through the slits 8 and the acoustic air vibrations through the slits 9 are mixed in the housing of the handset, but since these acoustic air vibrations are opposite in phase to each other, they both It is canceled out by being offset in the housing. As a result, the sound pressure decreases at the frequency of the acoustic air vibrations canceled in the opposite phase.

FIG. 3 shows the frequency-to-sound pressure characteristic of the embodiment of the present invention and the frequency-body temperature / pressure characteristic of the conventional handset in comparison. In FIG. 3, the frequency-to-sound pressure characteristic of the embodiment of the present invention shown in FIGS. 1 and 2 is, as shown by the solid line I, compared with the frequency-to-sound pressure characteristic of the conventional handset shown by the dotted line II. By canceling out the acoustic air vibrations of opposite phases by the slits 8 and 9, the sound pressure particularly in the low frequency range and the middle frequency range is lowered, and as a result, the sound pressure can be included in the frequency characteristic mask, which is preferable for hearing. Frequency vs. sound pressure characteristics are obtained.

The above effects of the present embodiment are obtained by a simple mechanical structure provided with the slits 8 and 9 instead of the electric signal processing for the audio signal by the correction circuit, so that the cost of the device is not increased. A structurally compact structure can be obtained, and it is particularly suitable for application to a handset of a mobile phone.

Next, another embodiment of the present invention will be described. FIG. 4 shows a sectional view of another embodiment of the handset according to the present invention. In the figure, the same components as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. In the embodiment shown in FIG. 4, the back spacer 7 of the embodiment shown in FIG. 1 is eliminated, and a printed board 10 provided with a leak hole 11 is used instead of the printed board 1.

In this embodiment, the acoustic air vibration output from the front surface of the receiver 3 is emitted to the outside of the receiver through the sound hole 4 and is output to the inside of the receiver through the slit 8. At the same time, the acoustic air vibration output from the back surface of the receiver 3 is output into the receiver through the leak hole 11. That is, the printed board 10
Is provided in the housing of the handset, but does not form an airtight housing with the front case 2, but the housing of the handset is composed of the front case 2 and a rear case (not shown). There is. The printed board 10 is a relatively small board housed in this housing, and although not shown, there is a gap between the end of the printed board 10 and the inner wall of the receiver housing.

As a result, the acoustic air vibration generated from the back surface of the receiver 3 is output to the inside of the receiver housing through the leak hole 11, and further passes through the gap between the end portion of the printed board 10 and the inner wall of the receiver housing, The acoustic air vibrations from the front surface of the receiver 3 through the slits 8 are mixed with each other in the housing of the receiver, and the both are canceled and canceled out in the housing. As a result, the sound pressure decreases at the frequency of the acoustic air vibrations canceled in the opposite phase. Therefore, also in the present embodiment, similarly to the embodiment shown in FIG. 1, it is possible to obtain the frequency-sound pressure characteristic which is included in the frequency characteristic mask and which is preferable for hearing.

The present invention is not limited to the above-described embodiment, and the present invention has means for leaking acoustic air vibrations from both the front surface and the back surface of the receiver 3 and mixing them in the housing. It is only necessary to do so, for example, the holder 5
Instead of the spacer 6 attached to the front surface of the device, a rib equivalent to the spacer 6 may be formed on the front case, and the rib may be provided with a slit that allows acoustic air vibration to leak into the housing of the handset.

[0024]

As described above, according to the present invention,
By utilizing the fact that the acoustic air vibrations generated from the front of the receiver and the acoustic air vibrations generated from the back of the receiver have opposite phases, they are mixed in the housing of the handset, and both acoustic air signals Therefore, it is possible to set the frequency characteristic versus the sound pressure characteristic within the acoustic mask which is audibly preferable due to the inexpensive structure without using a complicated correction circuit that processes electric signals.

Further, according to the present invention, since the desired characteristics can be obtained with a simple structure, the size can be reduced,
In particular, it is suitable for application to a handset of a mobile phone.

Further, according to the present invention, when the present invention is applied to a handset of a portable telephone which can obtain a frequency-to-sound pressure characteristic exceeding that of an acoustic mask in a mid-range frequency, a desired size can be set by setting a slit size. It is possible to obtain frequency versus sound pressure characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a top view of a main part of FIG.

FIG. 3 is a diagram showing a comparison between the present invention and a conventional frequency-sound pressure characteristic.

FIG. 4 is a sectional view of another embodiment of the present invention.

FIG. 5 is a diagram showing a frequency characteristic mask which is preferable for hearing.

FIG. 6 is a frequency vs. sound pressure characteristic diagram of an example of a conventional handset.

[Explanation of symbols]

1, 10 printed circuit board 2 front case 3 receiver 4 sound holes 5 holder 6 Front spacer 7 Rear spacer 8, 9 slits 11 leak hole

Claims (6)

[Claims] 1. A receiver in which a receiver is provided in a hollow inside of a housing including a substrate, and acoustic air vibration generated from the receiver is emitted through a sound hole formed in a front case of the housing, the receiver being airtight. A structure in which acoustic air vibrations from both the front surface and the rear surface of the receiver supported by the holder in a state are leaked to the outside of the holder and into the housing, and are mixed in the housing. Handset characterized by having done. 2. A handset in which a receiver is provided inside a hollow of a housing including a substrate, and acoustic air vibration generated from the receiver is emitted through a sound hole formed in a front case of the housing. A holder that supports the periphery of the receiver in the housing, and first and second spacers having slits respectively provided between the holder and the front case and between the holder and the substrate. The acoustic air vibrations generated from the front and back of the receiver,
And a structure in which the second spacer is leaked into the housing through the slits to be mixed with the second spacer. 3. A receiver in which a receiver is provided inside a hollow of a housing including a substrate, and acoustic air vibration generated from the receiver is emitted through a sound hole formed in a front case of the housing, A front surface of the receiver, which includes a holder that supports the periphery of the receiver in the housing, a spacer having a slit provided between the holder and the front case, and a leak hole formed in the substrate. And acoustic air vibration generated from the back,
A receiver having a structure in which the spacers and the leak holes of the substrate are passed through to leak into the housing and mix. 4. A handset in which a receiver is provided inside a hollow housing including a substrate, and acoustic air vibrations generated from the receiver are emitted through a sound hole formed in a front case of the housing. A holder supporting the periphery of the receiver in the housing, a spacer having a slit provided between the holder and the substrate, and provided between the holder and the front case,
A rib having a slit, and acoustic air vibrations generated from the front surface and the back surface of the receiver are leaked into the housing through the slit of the rib and the slit of the spacer, respectively, and mixed. A handset characterized by that. 5. The handset according to claim 2, wherein a size of the slit is set so that a frequency-sound pressure characteristic is included in a desired acoustic mask. 6. The handset according to claim 5, wherein the desired acoustic mask is an acoustic mask in a mobile phone.