TW201906417A - Bone conduction speaker unit - Google Patents

Abstract

To address the problem of providing a bone conduction speaker unit with which it is possible to incorporate a vibration-proof structure inside a speaker unit body in order to improve vibration characteristics, thereby suppressing sound leakage and vibration from the unit as a separate entity. The present invention is configured from: a bone conduction speaker body 1 equipped with a contact 2 brought into contact with an ear or the periphery of the ear when in use; a weight 3 for receiving the bone conduction speaker body 1, the weight 3 being disposed on the underside of the bone conduction speaker body 1; and a spring 4 for supporting the weight 3, the spring 4 being disposed on the inner bottom surface of a case 5; the bone conduction speaker body 1 being loaded inside the case 5 with the contact 2 exposed.

Description

 Bone conduction speaker unit  

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a bone conduction horn unit, and more particularly to a bone conduction horn unit which does not cause a problem of leakage when incorporated into a mobile phone or the like.

The bone conduction horn unit is a communication device that converts a sound signal into vibration and transmits it to a skull or the like. Since it is small, lightweight, and can be used under noise, it has been widely used in communication devices such as mobile phones in recent years.

In the case where the bone conduction horn unit is incorporated into the earpiece of the telephone, the vibration of the horn may cause the outer casing of the earpiece to vibrate, which may cause a sound leakage. Further, the vibration output enters the microphone and is likely to cause howling. In order to prevent such phenomena, it is necessary to isolate the bone conduction horn unit from the earpiece body (housing).

A common bone conduction horn unit is a structure in which a magnetic bone conduction horn is fixed in a small casing (see Fig. 11). This type of bone conduction horn unit is a structure in which the entire housing is vibrated. Therefore, when it is incorporated into the body of the earpiece, if it is not designed to be spaced apart from the unit and the body by a suitable elastic substrate to absorb the vibration of the horn, There is also a disadvantage that the body side also vibrates, which causes an increase in so-called leakage. In addition, the larger the size of the speaker unit, the larger the airway sound (leakage) generated from the speaker unit itself becomes.

A bone conduction horn unit that can prevent the occurrence of a leak during non-calling and which can exhibit the performance of a bone conduction horn which is the same as the conventional technique during a call has been proposed (Patent Document 1) Japanese Patent No. 4369976 (refer to FIG. 12), comprising: a housing made of an elastic material that surrounds and supports the whole of the bone conduction horn; and a movable top surface covering the upper surface of the housing and communicating with the bone The vibrating plate contacts and vibrates together with the vibrating plate; and is formed on the inner surface of the movable top surface with a protruding portion. When the communication device is not in use, only the protruding portion abuts on the plate fixed to the vibrating plate. Yoke.

However, in the case of the configuration of this scheme, in the range of absorbable vibration, although the propagation of vibration in the intermediate frequency domain and the high frequency domain is not problematic, the vibration in the low frequency domain is absorbed by the elastic matrix and attenuated. Therefore, there is a disadvantage that the characteristics of the low frequency domain cannot be sufficiently ensured. In this case, in order to cover the low frequency domain characteristics and strongly press the horn unit against the human body, it becomes impossible to absorb the vibration by the elastic base portion, and the vibration is transmitted to the body side to cause an increase in leakage noise.

Further, a bone conduction horn unit (Patent Document 2: WO2014/083986, see FIG. 13) has been proposed, in which a bone conduction horn system is disposed in a casing via an elastic substrate, and the elastic plate is adhered thereto. A contact body is disposed on the top surface of the elastic yoke and is disposed on the inner surface of the elastic cover body. When the elastic cover body is embedded in the housing, the bottom surface of the contact body and the upper surface of the plate yoke of the bone conduction horn body are maintained. There is a gap, and when a pressing force is applied to the elastic cover when in use, the lower surface of the contact body comes into contact with the elastic plate on the upper surface of the plate yoke.

However, in the case of the bone conduction horn unit, when the pressing force is not applied to the elastic cover body, the lower surface of the contact body and the upper surface of the elastic plate, or the lower surface of the thick wall portion and the upper surface of the plate yoke Since there is always a gap therebetween, it is possible to surely prevent the design of the vibration characteristics from being inadvertently improved by not paying attention to the transmission of the vibration to the elastic cover to cause the occurrence of the sound vibration and the occurrence of the sound leakage. Furthermore, the above Patent Documents 1 and 2 are the applications filed by the applicant of the present application.

 [Previous Technical Literature]    [Patent Literature]  

Patent Document 1: Japanese Patent No. 4369976

Patent Document 2: WO2014/083986

As described above, in a mobile phone or the like using a conventional bone conduction horn, since the contact body is in close contact with the plate yoke at all times, there is contact even when the contact body does not abut on the side of the head. The body vibrates to produce a sound vibration that causes a problem of leakage. Moreover, although various solutions for solving this problem have been proposed, the case of the bone conduction horn proposed by the prior art is not related to the problem of solving the leakage due to the improvement of the vibration characteristics.

Accordingly, the present invention relates to an improvement in vibration characteristics, and an object of the invention is to provide a bone conduction horn unit which can suppress sound leakage and vibration from a unit body by incorporating an anti-vibration structure into a horn unit body.

The invention of claim 1 for solving the above problems provides a bone conduction horn unit comprising: a bone conduction horn body having a contact body abutting on an ear or a peripheral portion thereof in use; and a weight The bone conduction horn body is disposed on the lower side of the bone conduction horn body, and the elastic body is disposed on the inner bottom surface of the housing to support the weight; wherein the bone conduction horn system exposes the contact body and It is filled in the above casing.

In one embodiment, the elastic system spring or the resin elastic plate.

In one embodiment, the contact body is exposed, and the bone conduction horn body is housed in the inner casing, and the back surface of the inner casing is carried by the weight.

In one embodiment, a ring groove is formed on an inner side surface of the casing, and a flange that is non-contactly moved up and down in the ring groove is formed on a side surface of the inner casing. In this case, the housing may be formed by the housing portion and the housing that is fitted to the housing portion, and a flange that is convex at the upper end of the housing may be formed, and the flange of the inner protrusion and the housing portion may be The space between the upper ones serves as the above-mentioned ring groove.

As described above, according to the present invention, since the bone conduction horn main body is housed in the casing via the weight and the elastic body constituting the vibration braking portion, the low frequency region of the front vibration characteristic can be improved, and the back surface (the casing side) can be suppressed to a large extent. Vibration, thereby having the effect of a bone conduction horn unit that can constitute a problem without leakage.

Further, since the generated vibration is efficiently transmitted to the front side (contact body side), it is effective in transmitting vibration to the human body side by gently abutting the contact body.

1‧‧‧Bone conduction horn body

2‧‧‧Contact body

2a‧‧‧ skirt

3‧‧‧ Heavyweight

4‧‧‧ Spring

4a‧‧‧Flexible board

5‧‧‧Shell

5a‧‧‧立立

6‧‧‧ inner shell

7‧‧‧ Ring groove

8‧‧‧ peripheral flange

9‧‧ ‧ Body Department

10‧‧‧ frame

10a‧‧‧inward flange

11‧‧‧Y yoke

12‧‧‧ center column

13‧‧‧ voice coil

14‧‧‧ magnet

15‧‧‧vibration board

16‧‧‧ side wall

17‧‧‧ plate yoke

17a‧‧‧ Both ends of the long side

18‧‧‧ openings

19‧‧‧Wire

20‧‧‧ body shell

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing an embodiment of a bone conduction horn unit of the present invention.

Fig. 2 is a longitudinal sectional view showing another embodiment of the bone conduction horn unit of the present invention.

Fig. 3 is a vertical cross-sectional view showing the state of use of the bone conduction horn unit shown in Fig. 2.

Fig. 4 is a view showing a configuration example of a spring used in the embodiment shown in Figs. 1 to 3;

Fig. 5 is a longitudinal sectional view showing still another embodiment of the bone conduction horn unit of the present invention.

Fig. 6 is a longitudinal sectional view showing still another embodiment of the bone conduction horn unit of the present invention.

Fig. 7 is a longitudinal sectional view showing still another embodiment of the bone conduction horn unit of the present invention.

Fig. 8 is a longitudinal sectional view showing a modification of the bone conduction horn unit shown in Fig. 5.

Fig. 9 is an exploded perspective view of the bone conduction horn body of the bone conduction horn unit of the present invention.

Fig. 10 is a graph showing the vibration characteristics of the effectiveness of the bone conduction horn unit of the present invention, (A) showing the case of having a weight and an elastic body, (B) showing the case of having only a weight, and (C) showing no. The case of heavy blocks and elastomers.

Fig. 11 is a longitudinal sectional view showing a configuration example of a conventional bone conduction horn unit.

Fig. 12 is a longitudinal sectional view showing another configuration example of a conventional bone conduction horn unit.

Fig. 13 is a longitudinal sectional view showing still another configuration example of a conventional bone conduction horn unit.

The form for carrying out the invention will be described based on the drawings. 1 is a longitudinal cross-sectional view showing an embodiment of a bone conduction horn unit of the present invention. As shown in the figure, the bone conduction horn unit of the present invention is composed of the following members: a bone conduction horn body 1 which is abutted in use. a contact body 2 at the ear or a peripheral portion thereof; a weight 3 disposed on a lower side of the bone conduction horn body 1 to carry the bone conduction horn body 1; and an elastic body disposed on the inner bottom surface of the housing 5 to support The weight 3; wherein the bone conduction horn body 1 exposes the contact body 2 in a flying state and is filled in the casing.

A spring 4 (see Figs. 1 to 4) such as a coil spring or a leaf spring made of an elastic resin or a metal, or an elastic plate 4a made of resin (see Figs. 5 to 8). First, a case where the spring 4 is used as an elastic body will be described with reference to Figs. 1 to 4 . The casing 5 is usually made of a hard resin, and the bottom surface of the spring 4 is fixed to the inner bottom surface thereof. The diameters of the bone conduction horn body 1, the weight 3, and the spring 4 are set to be smaller than the inner diameter of the casing 5 so as not to contact the inner side surface of the casing 5 when the bone conduction horn body 1 is driven.

In the embodiment shown in FIG. 2, the bone conduction horn main body 1 is housed in the inner casing 6 in a state in which the contact body 2 is suspended from the upper surface of the inner casing 6. In this case, the weight 3 is adhered to the back surface of the inner casing 6.

In the case of the present embodiment, the annular groove 7 is formed on the inner side surface of the casing 5, and the outer peripheral flange 8 is formed on the outer surface of the inner casing 6, which is driven by the bone conduction horn body 1 The contact groove 7 moves up and down in a non-contact manner. As the case 5 in this case, as shown in FIG. 2, the container body 9 and the frame body 10 fitted to the container body 9 can be used. In this case, the inner convex flange 10a is formed at the upper end of the casing 10, and the space between the inner convex flange 10a and the upper surface of the volume portion 9 becomes the annular groove 7.

Fig. 3 shows a state in which the bone conduction horn unit of the present embodiment is incorporated in the main body casing 20 of a mobile phone or the like. In the case of the present embodiment, even if the main body flange 8 does not come out of the ring groove 7 even when the body is dropped, the outer peripheral flange 8 can prevent the bone conduction horn body 1 from flying out and being damaged.

For example, as shown in FIG. 9, the bone conduction horn main body 1 is provided with a voice coil 13 so as to surround the column 12 provided in the central portion of the yoke 11, and a pair of rod-shaped magnets are fixed to both sides of the voice coil 13 14, 14 and the vibrating plate 15 is disposed so as to cover the voice coil 13 and the magnets 14, 14. The vibrating plate 15 is fixed to the upper surface of the side wall 16 which is erected on both ends of the yoke 11 by bolt locking. At this time, a gap is maintained between the vibrating plate 15 and the upper surface of the voice coil 13.

The opening 18 corresponding to the plate yoke 17 is formed by the vibrating plate 15, and both end portions 17a of the plate yoke 17 extending beyond the opening 18 are fixed to the edge of the opening 18 to close the opening 18. The plate yoke 17 is provided in such a manner. In this manner, the plate yoke 17 is configured to vibrate in accordance with the vibration of the diaphragm 15 . Further, in the above-described configuration, the magnets 14 and 14 are disposed on the outer side of the voice coil 13 as a so-called outer magnetic type, and conversely, the so-called inner magnetic body in which the magnet is disposed inside the voice coil (the magnet also serves as the center pillar) may be used. The composition of the type. The wire 19 extending from the voice coil 13 is pulled out from the opening provided in the side wall of the casing 5.

In the case of the bone conduction horn unit of the present invention, the bone conduction horn main body 1 is disposed via the weight 3 disposed on the back surface of the yoke 11 (see FIG. 1) or the back surface of the inner casing 6 (see FIG. 3). On the spring 4, and supported by the spring 4. The heavier the weight of the weight 3, the greater the vibration braking effect, but it is usually set to about twice the weight of the bone conduction horn body 1. The contact body 2 for transmitting vibration to the human body is placed on the vibration plate 15 of the bone conduction horn body 1 via the plate yoke 17.

In the example shown in Figs. 5 to 7, the elastic plate 4a is used as the elastic body instead of the spring 4, and the other constitutions and the use of the spring 4 are substantially unchanged. Further, although not shown in Figs. 5 to 7, it is a matter of course that the inner casing 6 shown in Figs. 2 and 3 can be employed.

The contact body 2 shown in FIG. 6 has a structure in which a skirt portion 2a having a groove is formed in a peripheral portion of the lower surface thereof, and a structure in which the vertical wall 5a formed on the upper surface of the casing 5 is housed in a non-contact manner in the groove.

Further, the contact body 2 of the example shown in FIG. 7 is provided with the skirt portion 2a at the periphery, but in this case, the skirt portion 2a is fixed to the upper surface of the casing 5, and the contact body 2 and the bone conduction horn body 1 are A slight gap is maintained between the plate yokes 17 of the vibrating plate 15. This gap is set such that when a certain amount of force is applied to the contact body 2, that is, when the contact body 2 is pressed against the side surface of the head or the like, and the contact body 2 is pressed inside, the contact body 2 can be surely placed inside the contact body 2 The top surface abuts against the spacing of the plate yokes 17 of the vibrating plate 15.

The form of the contact body 2 shown in Figs. 6 and 7 can also be employed in the embodiment shown in Figs.

As described above, the bone conduction horn main body 1 in the bone conduction horn unit of the present invention is provided on the elastic body of the spring 4 or the like via the weight 3 disposed on the back side of the yoke 11, and is composed of the weight 3 and the spring 4 and the like constitute a feature of the vibration braking portion. With such a configuration, the front vibration characteristics and the back surface vibration characteristics can be simultaneously improved as compared with the case where the structure is supported only by the elastic substrate.

Fig. 10 is a graph showing the vibration characteristics of the bone conduction horn unit of the embodiment shown in Fig. 1, and the graph shows the case of the bone conduction horn unit of the present invention (Fig. 10(A), weight + elastomer) The playback range of the low frequency band on the front side is expanded, and the characteristics of the low frequency domain are improved. Observing the back surface vibration characteristics, since the output level of the low frequency band is further lowered as compared with the case of no weight 3 (Fig. 10(B)), it can be confirmed that the leakage sound of the low frequency band is further improved. Further, in the case of only the elastic body shown in FIG. 10(B), although the back surface vibration output is largely lowered, the front side vibration characteristics are deteriorated, and the resonance frequency in the low frequency band is increased, and FIG. 10(C) is also shown. In the case of no weight and elastomer, it is understood that the back surface vibration output is large and the leakage sound is large.

In the case where the bone conduction horn unit is actually used, although the contact body 2 is pressed to the periphery of the ear canal of the human body for use, in the case of the bone conduction horn unit of the present invention, the weight 3 is attached to the bone conduction horn body. On the rear side of the first side, the generated vibration can be efficiently transmitted to the front (on the side of the contact body 2), so that the vibration can be transmitted to the human body side by gently pressing.

In the case of the bone conduction horn unit of the present invention, when the pressure is not applied to the contact body 2, the vibration of the vibration can be obtained by the synergistic multiplication of the elastic body such as the weight 3 and the spring 4 Therefore, it can prevent unintentional leakage. Further, the braking effect of the vibration can be obtained by combining the weight 3, the spring 4, and the like. Therefore, even if the casing 5 is formed as a part of the body casing 20 of a mobile phone or the like as shown in FIG. The same effect can be obtained.

The bone conduction horn unit of the present invention is configured as described above and is completed as a separate unit with few leakage sounds. Therefore, it can be directly incorporated into the body casing of the mobile phone by any mounting method, and is very convenient and industrial. The availability is great.

Claims (5)

 A bone conduction horn unit is composed of a bone conduction horn body having a contact body abutting on an ear or a peripheral portion thereof in use, and a weight disposed on a lower side of the bone conduction horn body to carry the above a bone conduction horn body; and an elastic body disposed on the inner bottom surface of the housing to support the weight; wherein the bone conduction horn system exposes the contact body and fills the housing.    The bone conduction horn unit of claim 1, wherein the elastic system spring or the resin elastic plate.    The bone conduction horn unit according to claim 1 or 2, wherein the contact body is exposed to house the bone conduction horn body in the inner casing, and the back surface of the inner casing is carried by the weight.    The bone conduction horn unit of claim 3, wherein a ring groove is formed on an inner side surface of the casing, and a peripheral flange that is non-contactly moved up and down in the ring groove is formed on a side surface of the inner casing.    The bone conduction horn unit of claim 4, wherein the housing is formed by a housing portion and a frame that is fitted to the housing portion, and a convex flange is formed on an upper end of the frame body, and the convex portion is convex. The space between the edge and the upper surface of the above-described volume portion becomes the above-mentioned ring groove.