TW201808016A - Bone conduction speaker unit - Google Patents

Abstract

A bone conduction speaker unit is provided with an intention for improving the vibration characteristics by combining an anti-vibration structure into a speaker unit body so as to inhibit sound leakage and vibration from unit elements. The invention is made by combining a bone conduction speaker body 2 into a case 1 via an elastic base 3 and a weight 4, with the elastic base 3 being loaded on an inner bottom of the case 1, the weight 1 being arranged on a back of a yoke 11 of the bone conduction speaker body 2, and on the bone conduction speaker body 2 being provided a contact plate 5 which in use is abutted against an ear or a peripheral part of it.

Description

Bone conduction horn unit

The present invention relates to a bone conduction speaker unit, and more specifically, it relates to a bone conduction speaker unit that does not cause a sound leakage problem when a mobile phone is incorporated.

The bone conduction speaker unit converts sound signals into vibrations and transmits them to the skull and the like. Since they are small and light and can be used in a noisy environment, they have recently been widely used in communication equipment such as mobile phones.

In the case where the bone conduction speaker unit is incorporated into a hand set of a telephone, there is a possibility that the vibration of the horn portion causes the shell of the ear piece to vibrate and cause sound leakage, and the vibration output will go around the microphone and easily cause howling. Howling. To prevent such problems, it is necessary to isolate the bone conduction speaker unit from the earpiece body (housing).

As a method of isolating the bone conduction speaker unit from the earpiece body, there has been proposed a structure in which the bone conduction speaker unit is mounted on the earpiece body via a mounting member made of a vibration-proof material having a H-shaped cross section (Patent Document 1: Japanese Patent (Gazette No. 4276675, refer to FIG. 7). In the case of this configuration, although the vibration transmission between the bone conduction horn unit and the housing of the body can be suppressed, there is a problem that sound leakage occurs because the airway sound generated by the bone conduction horn unit alone cannot be suppressed.

However, the general bone conduction speaker unit is a magnetic bone conduction speaker. A structure used by being fixed in a small housing (see Fig. 8). The bone conduction speaker unit of this type has a structure that vibrates the entire casing. Therefore, when the earpiece body is assembled, if it is not configured to absorb the vibration of the speaker through an appropriate elastic base between the unit and the body, the body side will be It vibrates, and there is a disadvantage that the so-called leakage sound becomes large. In addition, if the size of the speaker unit is larger, the airway sound (leakage) generated from the speaker unit itself becomes larger.

In order to solve such a problem, as a bone conduction speaker unit that prevents the occurrence of sound leakage when not talking, and can exert the same performance as a conventional bone conduction speaker during a call, a structure is proposed which surrounds the bone conduction speaker A container portion made of elastic material that is integrally supported, and a movable top surface that covers the upper surface of the container portion and contacts the vibration plate of the bone conduction horn to vibrate with it, and is formed on the inner surface of the movable top surface When the communication device is not used, only the projection is in contact with the plate yoke portion fixed to the vibration plate (Patent Document 2: Japanese Patent No. 4369976, see FIG. 9).

However, in the case of the constitution of the proposal, in the use in the range of absorbable vibration, although the vibration in the middle frequency range and the high frequency range can be transmitted normally, but the vibration in the low frequency range will be absorbed by the elastic substrate. Attenuation, therefore, has the disadvantage that the characteristics in the low frequency range cannot be sufficiently ensured. In this case, if the horn unit is strongly pushed against the human body in order to compensate for the low-frequency characteristics, the vibration cannot be absorbed by the elastic base portion, and the vibration is transmitted to the body side, resulting in increased leakage.

In addition, a bone conduction horn unit is proposed, which is characterized in that the bone conduction horn system is arranged in the housing via an elastic base, an elastic plate is fixed to the upper surface of the plate yoke portion, and is provided on the inner top surface of the elastic cover. There are contacts, and when the elastic cover is installed on the housing, the lower surface of the contacts and the plate yoke of the bone conduction horn body A gap is maintained between the upper surfaces, and when a pressing force is applied to the elastic cover during use, the lower surface of the contact becomes an abutment state of the elastic plate abutting on the upper surface of the plate yoke portion (Patent Document 3: WO2014 / 083986 (See Figure 10).

However, in the case of the bone conduction horn unit, when the pressing force is not applied to the elastic cover when it is not in use, it is because the surface between the lower surface of the contact plate and the upper surface of the elastic plate, or the surface below the thick portion and A gap is maintained between the upper surfaces of the plate yoke at any time. Therefore, although it is possible to reliably prevent the occurrence of sound vibration or sound leakage caused by the transmission of unexpected vibration to the elastic cover, it is not an attempt to improve the vibration characteristics. By. In addition, the aforementioned patent documents 1 to 3 are all applicants filed by the applicants of this case.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4276675

[Patent Document 2] Japanese Patent No. 4369976

[Patent Document 3] WO2014 / 083986

As mentioned above, in a mobile phone or the like using a conventional bone conduction speaker, since the contact piece is in close contact with the plate yoke at any time, even when the contact piece is not in contact with the side of the head, the phone is still in a state of not talking. There is a problem that the contact member vibrates to generate sound vibration and cause sound leakage. In addition, although various solutions have been proposed to solve this problem, in the case of bone conduction speakers proposed in the past, it is not intended to solve the problem of sound leakage by improving vibration characteristics.

The subject of the present invention is to provide a bone conduction speaker unit, which The figure improves the vibration characteristics. By incorporating the anti-vibration structure into the speaker unit body, it is possible to suppress the sound leakage and vibration from the unit unit.

In order to solve the aforementioned problems, the first invention is a bone conduction horn unit, which is a bone conduction horn body assembled into a casing through an elastic base and a weight body. The elastic base is filled on the inner bottom surface of the casing, and the weight is The system is arranged on the back of the yoke portion of the bone conduction horn body, and a contact plate is provided on the bone conduction horn body to be abutted against the ear or its peripheral portion during use.

In one embodiment, the weight of the weight body is set to about twice the weight of the bone conduction speaker unit, and the weight system is formed to have a smaller diameter than the inner diameter of the casing.

In one embodiment, the contact plate is fixed to the plate yoke of the vibration plate of the bone conduction horn body, and in another embodiment, the contact plate is connected to the plate yoke of the vibration plate of the bone conduction horn body. The parts are fixed to the upper surface of the housing with a gap between the parts.

According to the present invention, as described above, since the bone conduction speaker system is equipped in the housing via the weight portion and the elastic base constituting the vibration braking portion, the low frequency range of the front vibration characteristics can be improved and the backward direction (case side ) Vibration, which has the effect of obtaining a bone conduction speaker unit without sound leakage problems. In addition, since the generated vibration is efficiently transmitted to the front (contact portion side), there is an effect that the vibration can be transmitted to the human body by simply contacting the contact portion.

1‧‧‧shell

2‧‧‧Bone conduction speaker body

3‧‧‧ flexible base

4‧‧‧ weight body

5‧‧‧ contact plate (contact portion)

5a‧‧‧Edge

9‧‧‧Body housing (body)

11‧‧‧Yoke

12‧‧‧ center pillar

13‧‧‧voice coil

14‧‧‧ Magnet

15‧‧‧Vibration plate

16‧‧‧ sidewall

17‧‧‧ plate yoke

17a‧‧‧ both ends in the length direction

18‧‧‧ opening

19‧‧‧Wire

FIG. 1 is a longitudinal sectional view of an embodiment of a bone conduction speaker unit according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state of use of the bone conduction horn unit shown in FIG. 1. FIG.

FIG. 3 is a longitudinal sectional view of another embodiment of the bone conduction speaker unit according to the present invention.

FIG. 4 is a longitudinal sectional view of still another embodiment of the bone conduction speaker unit of the present invention.

5 is an exploded perspective view of a bone conduction horn body of a bone conduction horn unit of the present invention.

FIG. 6 is a graph showing the vibration characteristics of the effectiveness of the bone conduction speaker unit of the present invention.

Fig. 7 is a longitudinal sectional view showing a configuration example of a conventional bone conduction speaker unit.

FIG. 8 is a longitudinal sectional view showing another example of the structure of the conventional bone conduction speaker unit.

FIG. 9 is a longitudinal sectional view showing another example of the structure of the conventional bone conduction speaker unit.

Fig. 10 is a longitudinal sectional view showing another example of the structure of the conventional bone conduction speaker unit.

The form for implementing this invention is demonstrated based on accompanying drawing. FIG. 1 is a longitudinal sectional view of a bone conduction horn unit according to the present invention. As shown in the figure, the bone conduction horn unit of the present invention is obtained by combining a bone conduction horn body 2 into a casing 1 through an elastic base 3 and a weight body 4 By.

The casing 1 is generally a container made of hard resin, and an elastic base 3 is provided on an inner bottom surface thereof. Although the bone conduction speaker unit of the present invention is often manufactured as an independent product, it may be formed integrally with the body case 9 of the transceiver (see FIG. 2). Elastic base 3 is made of foam materials such as urethane foam, acrylic foam, etc., or low hardness silicone rubber, urethane rubber, etc. Made of rubber material In general, the entire inner bottom surface of the casing 1 is filled without a gap.

As shown in FIG. 5, for example, the bone conduction horn body 2 is provided with a voice coil 13 so as to surround the middle pillar 12 provided in the central portion of the yoke portion 11, and a pair of rod-shaped ones are fixedly connected to both sides of the voice coil 13. The magnets 14 and 14 are provided with a vibration plate 15 so as to cover the voice coil 13 and the magnets 14 and 14. Both ends of the vibration plate 15 are fixed by being screwed to the upper surface of the side wall 16 which is erected on both ends of the yoke portion 11. At this time, a gap is maintained between the vibration plate 15 and the upper surface of the voice coil 13.

An opening 18 corresponding to the plate yoke portion 17 is formed in the vibration plate 15, and both ends 17 a in the longitudinal direction of the plate yoke portion 17 extending beyond the opening 18 are fixed to the edge portion of the opening 18 to make the plate The yoke portion 17 is arranged so as to block the opening 18. In this way, the plate yoke portion 17 will vibrate in accordance with the vibration of the vibration plate 15. In addition, although the above-mentioned configuration is a so-called outer magnetic type in which the magnets 14 and 14 are arranged outside the voice coil 13, the magnets can also be arranged inside the voice coil (the magnet also serves as the center pillar). , The so-called internal magnetic type. The wire 19 extending from the voice coil 13 is pulled out from an opening provided on the side wall of the casing 1.

In the case of the bone conduction horn unit of the present invention, the bone conduction horn body 2 is provided on the elastic base 3 via a weight body 4 fixed to the back surface of the yoke portion 11. The heavier the weight 4 is, the larger the vibration braking effect is, but it is known that a sufficient effect can usually be obtained by the weight of the bone conduction horn body 2 approximately twice. In addition, there is a need to make the diameter of the weight body 4 smaller than the inner diameter of the casing 1 so that the bone conduction horn body 2 does not contact the inner side surface of the casing 1 when the bone conduction horn body 2 is driven.

A contact plate 5 is disposed on the vibration plate 15 of the bone conduction horn body 2 to transmit vibration to the human body. The contact plate 5 of the example shown in FIGS. 1 to 3 is fixed to the plate yoke portion 17 of the vibration plate 15 of the bone conduction horn body 2 and is held as A state floating from the upper surface of the casing 1. The contact plate 5 in the example shown in FIG. 3 has a structure in which a peripheral edge portion 5a with a groove is formed on the periphery, and a peripheral wall formed on the upper surface of the housing 1 is received in the groove in a non-contact manner.

In addition, although the contact plate 5 of the example shown in FIG. 4 has an edge portion 5a at the periphery, in this case, the edge portion 5a is fixed to the upper surface of the housing 1, and the contact plate 5 and bone conduction A slight gap is maintained between the plate yoke 17 of the vibration plate 15 of the horn body 2. The gap interval is set such that when a certain amount of force is applied to the contact plate 5, that is, when the contact plate 5 is pressed into the inside as the contact plate 5 is pressed against the side of the head, etc., The inner top surface of the contact plate 5 can certainly abut against the plate yoke portion 17 of the vibration plate 15.

As described above, the bone conduction horn body 2 of the bone conduction horn unit of the present invention is characterized in that it is provided on the elastic base 3 via a weight body 4 fixed to the back surface of the yoke portion 11 and the vibration braking portion The system is composed of a weight body 4 and an elastic base 3. With the configuration as described above, a braking effect of 10 dB or more can be obtained compared to a case where the configuration is supported only by the elastic base 3.

In addition, it can be clearly seen from the vibration characteristic graph shown in FIG. 6 that the vibration characteristics in the low-frequency region may be improved. Fig. 6 shows the bone conduction speaker units A, A 'of the present invention, the bone conduction speaker units B, B' having only an elastic base and no weight body, and the bone conduction speaker units C, C 'without the vibration-proof mechanism. Graphs of front characteristics (A, B, C) and back characteristics = vibration characteristics (A ', B', C ') of the body mounting side. Here, the lower vibration level on the back means that the level of leakage sound is smaller when assembled into the body, and the lower vibration means that the airway sound generated is smaller.

It can be clearly seen from the graph of FIG. 6 that the bone conduction horn unit of the present invention can improve the characteristics of frontal vibration compared with a bone conduction horn unit without a vibration prevention mechanism. In the low frequency range of nature, the vibration toward the back surface (case side) is greatly suppressed. The same effect can be achieved for a bone conduction horn unit having only an elastic base and no weight body.

When the bone conduction horn unit is actually used, although the contact portion 5 is pressed against the periphery of the ear canal outside the human body, in the case of the bone conduction horn unit of the present invention, the weight body 4 is attached to the bone. The vibration generated from the rear side of the conductive horn body 2 can be efficiently transmitted to the front (the side of the contact portion 5). Therefore, the vibration can be transmitted to the human body by pressing it gently.

In the case of the bone conduction speaker unit of the present invention, when the contact plate 5 has not been pressed without a pressing force, the braking effect of vibration can be obtained by the multiplication of the weight body 4 and the elastic base 3, so it can be used. Prevent unexpected leakage. Furthermore, since the braking effect of vibration is obtained by combining the weight body 4 and the elastic base 3, as in the embodiment shown in FIG. 2, even if the housing 1 and the body 9 are integrated, it can still be obtained. The same effect.

Since the bone conduction speaker unit of the present invention has the aforementioned structure, and can be used as an independent unit with less sound leakage, it can be used directly in the body 9 of the mobile phone by any installation method, etc. It is very convenient to use, so it has great industrial applicability.

1‧‧‧shell

2‧‧‧Bone conduction speaker body

3‧‧‧ flexible base

4‧‧‧ weight body

5‧‧‧ contact plate (contact portion)

11‧‧‧Yoke

15‧‧‧Vibration plate

17‧‧‧ plate yoke

Claims (5)

A bone conduction horn unit is formed by combining a bone conduction horn body into a housing via an elastic base and a weight body. The elastic base is filled on the inner bottom surface of the housing, and the weight system is arranged on the yoke of the bone conduction horn body. The back surface of the body is provided with a contact plate which is abutted against the ear or its peripheral portion when in use on the bone conduction horn body. For example, the bone conduction horn unit of claim 1, wherein the weight of the weight body is set to about twice the weight of the bone conduction horn unit. The bone conduction speaker unit according to claim 1 or 2, wherein the weight system is formed to have a smaller diameter than the inner diameter of the casing. The bone conduction horn unit according to claim 1, wherein the contact plate is fixed to a plate yoke of a vibration plate of the bone conduction horn body. The bone conduction horn unit according to claim 1, wherein the contact plate is fixed to the upper surface of the housing with a gap between the contact plate and a plate yoke of the vibration plate of the bone conduction horn body.