JP4369976B2 - Bone conduction speaker holder and bone conduction speaker unit using the same - Google Patents

Description

  The present invention relates to a bone conduction speaker holder, and more particularly to a holder for supporting a bone conduction speaker and incorporating it into a housing of a communication device such as a telephone or a wireless communication device. The present invention relates to a bone conduction speaker holder with improved leakage and a bone conduction speaker unit using the same.

Bone conduction speakers convert audio signals into vibrations and transmit them to the skull, etc., and since they are compact and lightweight and can be used under noise, they have recently been widely used in communication devices such as mobile phones. It is coming.
When the bone conduction speaker is incorporated into the casing of the mobile phone, an elastic material (buffer material) is interposed to ensure isolation from the casing. However, especially in the case of a folding type mobile phone, there is not enough space for incorporating bone conduction speakers, and the thickness is required to be reduced. There is a problem that it cannot be obtained.
In order to solve this problem, the present inventor has proposed a configuration as shown in FIG. 4 (WO2005 / 069586A1). This surrounds and supports the bone conduction speaker 31 by an elastic holder 33 fixed to the inner surface of the housing 32. According to this configuration, since the bone conduction speaker 31 is isolated from the housing 32 by the elastic holder 33, the vibration is hardly transmitted to the housing 32.
In that case, in order to transmit the vibration of the diaphragm 34 of the bone conduction speaker 31 to the skull, a contact member 35 contacting the head is fixed to the diaphragm 34, but the vibration of the diaphragm 34 is efficiently transmitted to the contact member 35. In order to transmit well, the contact member 35 is fixed to the diaphragm 34 in a planar shape in a wide area. As a result, the vibration of the diaphragm 34 is always reliably transmitted to the contact member 35.
In the case of such a configuration, the contact member 35 vibrates and voice vibration (air conduction) occurs when the bone conduction speaker 31 operates even during a non-call, that is, when the contact member 35 is not pressed against the head surface. Sound) is generated, and there is a problem that a certain amount of sound leakage occurs.
WO2005 / 069586A1 JP 2003-348208 A JP 2004-187031 A Japanese Patent No. 2578823

  As described above, in a mobile phone using a conventional bone conduction speaker, the contact member vibrates and generates voice vibration even during non-calling when the contact member is not in contact with the head surface. There was a problem that some sound leakage occurred. The present invention has been made to solve such a problem. The bone conduction speaker holder is capable of preventing the occurrence of sound leakage during non-calling and capable of exhibiting the performance of a bone conduction speaker equivalent to the conventional one during calling. It is another object of the present invention to provide a bone conduction speaker unit using the same.

In order to solve the above problems, the invention according to claim 1 is a holder for installing a bone conduction speaker in a housing of a communication device such as a telephone, wherein the holder is made of an elastic material, and the bone conduction speaker is provided. A container that surrounds and supports the entire container and a movable top surface that covers the upper surface of the container. The movable top surface is an elastic membrane that can contact and vibrate with the diaphragm of the bone conduction speaker. The bone conduction speaker holder is characterized in that it has a protrusion on its inner surface and only the protrusion contacts the diaphragm of the bone conduction speaker when the communication device is not used.
One or a plurality of the protrusions are provided at the center of the inner surface of the movable top surface, and the movable top surface is integrally formed on the upper surface of the container, and the connecting portion with the upper surface of the container is a thin-walled portion. By doing so, sufficient mobility is given. The holder is entirely made of elastic plastic or rubber, and has a peripheral wall on the upper surface of the container for receiving a contact member pressed against the human body.
A bone conduction speaker unit according to an eighth aspect of the present invention for solving the above-mentioned problems is formed by supporting the bone conduction speaker by the holder and fitting the contact member to the peripheral wall.

According to the bone conduction speaker holder and the bone conduction speaker unit using the same according to the present invention, the entire surface of the bone conduction speaker in contact with the diaphragm is an elastic film, and a protrusion is formed at the center of the inner surface. Occasionally, only the protrusions are in point contact with the diaphragm of the bone conduction speaker so that the vibration is not easily transmitted to the contact member, and the generation of voice vibration due to the vibration of the contact member is also suppressed. The occurrence of sound leakage is minimized. During a call, the protrusion is crushed by pressing the contact member against the head or the like, and the inner surface of the movable top surface contacts the diaphragm of the bone conduction speaker so that the vibration of the diaphragm is applied to the contact member. It is transmitted reliably and sufficiently, and there is an effect that the function of the bone conduction speaker can be sufficiently exhibited.
Moreover, since the upper surface part of the bone conduction speaker housed in the holder according to the present invention is sealed in the holder, there is an effect that waterproofness and dustproofness for the bone conduction speaker are ensured.

The best mode for carrying out the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of a bone conduction speaker unit using a bone conduction speaker holder according to the present invention, and FIG. 2 is an exploded perspective view thereof.
A bone conduction speaker holder 1 according to the present invention is made of an elastic material such as elastic plastic or rubber, and surrounds and supports the entire bone conduction speaker 2 and a movable top surface 4 that covers the upper surface of the container 3. It consists of. The container 3 corresponds to the shape of the bone conduction speaker 2 housed and supported therein. In the illustrated example, the container 3 has a rectangular parallelepiped shape with rounded corners.
Overhang portions 5 and 6 are formed on the upper end portion and the lower end portion of the inner peripheral surface of the container portion 3, respectively. The movable top surface 4 is integrally formed by extending the upper overhanging portion 5 of the container 3 inward, but by providing the peripheral portion as a thin portion 7, sufficient mobility is imparted. . One or a plurality of protrusions 8 are usually formed at the center of the inner surface of the movable top surface 4. As for this protrusion 8, the front-end | tip part will always be in contact with the diaphragm of the bone conduction speaker 2 in the shape of a dot.
The opening 13 on the bottom surface of the bone conduction speaker holder 1 is used as an insertion port for the bone conduction speaker 2 and serves as an outlet for electrical wiring of the bone conduction speaker 2. The lower overhanging portion 6 serves as a retainer after the bone conduction speaker 2 is loaded. Further, a fixing overhang 9 is formed at the lower end of the outer surface of the container 3. The fixing overhang portion 9 is used to fix a bone conduction speaker unit configured using the bone conduction speaker holder 1 to a receiver 21 or a mobile phone casing 21 or the like. Is appropriately formed.
The peripheral edge of the upper surface of the container 3 is extended upward to form a peripheral wall 11 that is flush with the outer surface of the container 3. A contact member 12 to be pressed against the human body (mainly the head) is closely fitted in the peripheral wall 11, and the contact member 12 is held there. The outer surface of the contact member 12 that comes into contact with the human body is slightly curved, and the inner surface is brought into close contact with the upper surface of the movable top surface 4 (generally adhered) when fitted into the peripheral wall 11. Thus, the vibration of the movable top surface 4 is directly and reliably transmitted to the contact member 12.
The configuration of the bone conduction speaker 2 is not particularly different from that conventionally used. That is, the voice coil 16 is arranged at the center of the yoke 15, the magnets 17 are fixed on both sides thereof, the vibration support plate 19 is placed on the voice coil 16 by the side plates 18 raised from both ends of the yoke 15, and a slight gap is formed on the voice coil 16. Hold and support. A central opening is formed in the vibration support plate 19, and a plate yoke 20 is fixed on the vibration support plate 19 so as to face the central opening, and the protrusion 8 comes into contact with the upper surface of the plate yoke 20. It is also possible to adopt a so-called inner magnet type configuration in which the magnet is disposed inside the voice coil.
The protrusion 8 is lightly in contact with the plate yoke 20 of the bone conduction speaker 2 when the bone conduction speaker 2 is loaded. However, since the protrusion 8 itself is also elastic, the contact member 12 is placed on the head during a call. When pressed against the portion, the protrusion 8 is crushed and the substantially entire surface of the plate yoke 20 of the bone conduction speaker 2 is brought into close contact with the movable top surface 4. When vibration is generated by an audio signal in this state, the vibration is transmitted to the contact member 12 through the movable top surface 4 and bone conduction reception can be performed without any difference from the conventional one.
In addition, since the tip of the protrusion 8 is only lightly touching the plate yoke 20 of the bone conduction speaker 2 during non-calling, even if the plate yoke 20 vibrates, the vibration is difficult to transmit to the contact member 12. The occurrence of unintended sound leakage is minimized.
The bone conduction speaker unit according to the present invention has the above-described configuration, and the bone conduction speaker 2 is characterized in that the vibration surface side is sealed in the bone conduction speaker holder 1 and thus waterproof and dustproof measures are easy.
In order to demonstrate the effectiveness of the present invention, a comparison test was performed between the conventional type bone conduction speaker holder shown in FIG. 4 and the product of the present invention. In this test, sound leakage as an air conduction sound when a sine wave input is applied to each bone conduction speaker is measured. As is apparent from the graph of FIG. 3 showing the results, the product of the present invention has better results than those using the conventional bone conduction speaker holder over the entire vibration frequency band of 500 Hz to 6 kHz. The effectiveness of the present invention was confirmed.
Although the present invention has been described in some detail with respect to its most preferred embodiments, it will be apparent that a wide variety of different embodiments can be constructed without departing from the spirit and scope of the invention, the invention being defined by the appended claims. It is not restricted to the specific embodiment other than limiting in.

  It is a longitudinal cross-sectional view of the bone conduction speaker unit using the bone conduction speaker holder which concerns on this invention.   It is an exploded perspective view of the unit for bone conduction speakers using the bone conduction speaker holder concerning the present invention.   It is a graph which shows the result of the test done in order to demonstrate the sound leak improvement effect at the time of using the bone conduction speaker holder concerning this invention.   It is a longitudinal cross-sectional view of the bone conduction speaker unit using the conventional bone conduction speaker holder.

Claims (8)

  A holder for installing a bone conduction speaker in a housing of a communication device such as a telephone, wherein the holder is made of an elastic material and surrounds and supports the entire bone conduction speaker; and an upper surface of the container The movable top surface is an elastic film that can come into contact with the diaphragm of the bone conduction speaker and vibrate therewith. In use, the bone conduction speaker holder is characterized in that only the protrusion comes into contact with the diaphragm of the bone conduction speaker.   The bone conduction speaker holder according to claim 1, wherein one protrusion is provided.   The bone conduction speaker holder according to claim 1, wherein a plurality of the protrusions are provided.   The bone conduction speaker holder according to any one of claims 1 to 3, wherein the protrusion is provided at a central portion of the inner surface of the movable top surface.   2. The bone conduction speaker holder according to claim 1, wherein the movable top surface is formed integrally with an upper surface of the container, and sufficient mobility is provided by forming a connecting portion with the upper surface of the container as a thin portion. .   The bone conduction speaker holder according to claim 1, wherein the bone conduction speaker holder is entirely made of elastic plastic or rubber.   The bone conduction speaker holder according to claim 1, further comprising a peripheral wall for receiving a contact member pressed against a human body on an upper surface of the container.   A bone conduction speaker unit comprising a bone conduction speaker supported by the holder according to claim 7 and the contact member fitted to the peripheral wall.

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