WO2018014374A1

WO2018014374A1 - Bone conduction earphone and method of manufacturing same

Info

Publication number: WO2018014374A1
Application number: PCT/CN2016/093032
Authority: WO
Inventors: 邹俊峰
Original assignee: 邹俊峰
Priority date: 2016-07-19
Filing date: 2016-08-03
Publication date: 2018-01-25
Also published as: CN106028201A

Abstract

Disclosed are a bone conduction earphone and a method of manufacturing same. The earphone comprises an earphone casing (10), wherein the casing (10) surrounds a cavity; a frequency divider and a metal speaker are provided in the cavity; an inner wall of the casing (10) is provided with a bone conduction speaker; the frequency divider outputs an audio signal to the bone conduction speaker; and the frequency divider outputs a full-range frequency signal, a high-frequency signal, a mid-frequency signal or a low-frequency signal to the metal speaker. The method of manufacturing the earphone comprises: manufacturing an earphone casing (10), the casing (10) comprising a custom-made outer casing (11), and the custom-made outer casing (11) having an open end; manufacturing a cover plate (20) fixed outside the open end, at least a part of the custom-made outer casing (11) being attached to an ear canal; providing a circuit board (21) on the cover plate (20), a frequency divider being provided on the circuit board (21), and a bone conduction speaker being provided on an inner wall of the custom-made outer casing (11); and providing a metal speaker in the custom-made outer casing (11), the frequency divider and the bone conduction speaker being electrically connected, and the frequency divider being electrically connected to the metal speaker.

Description

Bone conduction earphone and manufacturing method thereof

Technical field

The present invention relates to the field of earphones, and more particularly to a bone conduction earphone that can be inserted into an ear canal of a human body and a method of manufacturing the bone conduction earphone. The present invention is based on a Chinese patent application filed on July 19, 2016, the application number of which is incorporated herein by reference.

Background technique

Headphones are commonly used in people's daily life. Usually, people wear headphones when listening to music to avoid affecting people around them. Most of the existing earphones include a plastic casing, a circuit board is arranged in the casing, an audio output circuit is arranged on the circuit board, and a moving ring speaker or a moving iron speaker is also provided, and the audio output circuit is turned to the moving ring speaker or The moving iron speaker outputs an audio signal to drive the moving ring horn or the moving iron horn to vibrate, thereby making a sound. Since the earphone is worn in the ear, the sound emitted from the earphone directly enters the ear canal, and does not affect the surrounding people.

However, the sound output by the conventional earphone is transmitted through the air, for example, the moving ring horn or the moving iron horn output obtains sound and propagates through the air as a medium to the eardrum, thereby causing the eardrum to vibrate. Since sound waves are attenuated when air travels, and because the ear canal is also connected to the outside world, for example, when people bite or cough, sound will enter the ear canal through the mouth. These sounds will affect the transmission of sound waves, resulting in multiple inner ear receiving. Sound waves, and ultimately affect people to enjoy the music output from the headphones.

To this end, people develop bone conduction headphones, bone conduction earphones have a housing, a bone conduction horn is arranged in the housing, that is, a bone conduction sensor, the audio output circuit outputs an electrical signal to the bone conduction sensor, and the bone conduction sensor is based on the received electrical signal. Vibrate and drive the housing of the earphone to vibrate. Since the housing of the earphone is in contact with the ear canal, that is, it is in contact with the bone around the ear canal, thereby causing the vibration of the bone to transmit sound waves to the inner ear through the vibration of the bone, therefore, the sound quality of the bone conduction earphone is better, satisfying people's high quality. The needs of headphones. In addition, for people with eardrum damage, bone conduction headphones can make up for the shortcomings of traditional headphones.

However, since the bone conduction sensor generally has good response performance to the intermediate frequency signal, that is, the intermediate frequency signal outputs a good bone conduction sensor, which can well drive the vibration of the bone conduction sensor, and can well transmit the intermediate frequency signal, but for the low frequency signal and High-frequency signal, the response performance of the bone conduction sensor is poor, and the vibration effect formed by the low-frequency signal and the high-frequency signal output to the bone conduction sensor is not obvious, resulting in insufficient transmission capability of the bone conduction earphone to the high-frequency signal and the low-frequency signal, which limits the limitation. The development of high quality headphones.

In addition, since the current bone conduction earphones are all made of universal blanks, the shape of the housing of each bone conduction earphone is the same, so that when the bone conduction earphone is worn, only a part of the bone conduction earphone housing is in contact with the skull, or even Contact, the conduction of vibration is greatly limited, affecting the performance of the bone conduction earphone.

technical problem

In order to solve the above problems, it is a primary object of the present invention to provide a bone conduction earphone that transmits audio with better performance.

Another object of the present invention is to provide a method of manufacturing a high quality bone conduction earphone.

Technical solution

To achieve the above main object, the bone conduction earphone provided by the present invention comprises a earphone housing, the housing encloses a cavity, a frequency divider and a metal horn are arranged in the cavity, and a bone conduction horn is arranged on the inner wall of the housing. The frequency converter outputs an audio signal to the bone conduction speaker, and the frequency divider outputs a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal to the metal speaker.

A preferred solution is that the housing comprises a custom outer casing having an open end, the outer end of which is fixed with a cover plate, at least a part of the custom outer casing is fitted to the ear canal, and the cover plate is provided with a circuit board. The frequency device is disposed on the circuit board, and the bone conduction horn is disposed on the inner wall of the custom housing or on the inner wall of the cover.

A further solution is that the custom housing is made of resin.

A further solution is that the audio signal output by the frequency divider to the bone conduction horn is a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal.

A further solution is that the metal horn is a moving coil horn, and the frequency divider outputs a full frequency signal, an intermediate frequency signal or a low frequency signal to the moving coil horn.

A further solution is that the metal horn is a moving iron horn, and the frequency divider outputs a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal to the moving iron horn.

In a further aspect, the customized outer casing includes a raised portion that fits the ear canal, and the bone guide horn is disposed on the inner wall of the raised portion.

In order to achieve the above other object, a method for manufacturing a bone conduction earphone according to the present invention includes manufacturing an earphone housing, the housing including a custom outer casing having an open end and making a fixed end outside the open end. a cover plate, at least a portion of the custom outer casing is fitted to the ear canal; a circuit board is disposed on the cover plate, the frequency divider is disposed on the circuit board, and the bone conduction horn is disposed on the inner wall of the custom outer casing or the inner wall of the cover plate; A metal horn is arranged in the custom casing, and the frequency divider and the bone conduction horn are electrically connected, so that the frequency divider outputs an audio signal to the bone conduction horn, and electrically connects the frequency divider and the metal horn, so that the frequency divider outputs the full frequency to the metal horn. Signal, high frequency signal, intermediate frequency signal or low frequency signal.

Beneficial effect

The bone conduction earphone provided by the invention not only has a bone guiding horn, but also has a metal horn, such as a moving ring horn or a moving iron horn, and transmits a high frequency signal or a low frequency signal through the moving ring horn and the moving iron horn to make up the bone guiding horn. Insufficient transmission of high-frequency signals and low-frequency signals improves the sound quality of bone conduction headphones.

Moreover, the housing of the bone conduction earphone includes a customized outer casing which is customized according to the shape of the human ear canal, so that the customized outer casing can fit in the ear canal, thereby ensuring a large contact area between the customized outer casing and the bone of the ear canal. The gap between the shell and the ear canal of the bone conduction earphone is reduced, on the one hand, the external sound can be prevented from entering the ear canal through the gap between the earphone housing and the ear canal, and on the other hand, the outer casing of the earphone and the outer ear canal The contact area of the bone is larger, and the transmission effect of the shock wave is better.

In addition, the frequency divider is used to divide the received audio into frequency, and the high frequency signal and the low frequency signal are output to the dynamic horn or the moving iron horn, and the intermediate frequency signal is output to the bone horn, so that the bone frequency horn is used for the intermediate frequency signal. Superior processing power, and the use of dynamic ring speakers and moving iron speakers for high-frequency signals, low-frequency signal processing, greatly improve the sound quality of headphones.

In addition, the use of resin to make the outer casing of the earphone is conducive to the transmission of sound waves, and the sound quality of the bone conduction earphone can be improved due to the better conduction performance of the sound wave in the resin material.

Moreover, the bone conduction earphone is made by the above method, and the contact area of the bone conduction earphone and the bone of the ear canal is improved by a customized outer casing, thereby improving the sound wave transmission performance. Moreover, the bone conduction horn and the metal horn are simultaneously arranged in the bone conduction earphone, and the transmission of the intermediate frequency and the high and low frequency signals is realized by the bone conduction horn and the metal horn, so that the transmission effect of the intermediate frequency and the high and low frequency signals is better, thereby improving the bone conduction earphone. Sound quality.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram of an embodiment of a bone conduction earphone of the present invention.

2 is a structural exploded view of an embodiment of a bone conduction earphone of the present invention.

3 is a structural view of a custom case in the embodiment of the bone conduction earphone of the present invention.

4 is a structural view of another perspective view of a custom housing in the embodiment of the bone conduction earphone of the present invention.

Figure 5 is a structural view of a cover plate in the embodiment of the bone conduction earphone of the present invention.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Embodiments of the invention

Referring to Fig. 1, the bone conduction earphone of the present embodiment includes a housing 10 including a custom housing 11 and a cover plate 20, the custom housing 11 being customized according to the shape of the human ear canal, so that the outer wall of the customized housing 11 can be fitted On the inner wall of the bone of the ear canal, the gap between the custom outer casing 11 and the inner wall of the ear canal is reduced to prevent external sound from entering the ear canal through the gap between the custom outer casing 11 and the inner wall of the ear canal.

Referring to Figure 2, the custom housing 11 has an open end 13 at one end and a flat peripheral edge 14 on the peripheral wall of the open end 13. The peripheral edge 14 is of an irregular shape and the cover 20 is secured to the peripheral edge 14 to provide a housing A cavity is formed in 10, that is, the custom casing 11 is an inner hollow casing. A device including a frequency divider, a bone conduction horn, a moving coil horn or a moving iron horn is disposed in the cavity. The cover plate 20 can be fixed to the open end 13 of the custom casing 11 by gluing or welding. Of course, the custom casing 11 and the cover plate 20 can also be fixed by snapping or the like, for example, at the open end 13 A fastening member is disposed on the cover plate 20, and a card slot corresponding to the fastening component is disposed on the cover plate 20, and is fastened in the card slot by the fastening component to achieve the fixing between the customized outer casing 11 and the cover plate 20.

In order to ensure that the cavity in the housing 10 is completely sealed, the area of the cover 20 needs to be slightly larger than the cross-sectional area of the open end 13 of the custom housing 11, and in the projection direction of the cover 20, the open end 13 is in the cover 20 The projection is entirely within the projection of the cover 20. The periphery of the cover 20 away from the side of the custom casing 11 is chamfered to prevent the outer edge of the cover 20 from being too sharp, which is also advantageous for the aesthetics of the bone conduction earphone.

Referring to Figures 3 and 4, the custom housing 11 is a housing that is designed and manufactured according to the shape of the ear canal of the user. Preferably, the custom housing 11 is a resin housing, which is custom made using agar to make a blank, and then according to the shape of the blank. A custom casing 11 is made of resin. Of course, you can also use a 3D printer to print a custom case of resin. The custom housing 11 has a raised portion 12 that projects into the ear canal. The raised portion 12 is generally cylindrical and extends from the body portion of the custom housing 11 into the ear canal. The bone guide horn is disposed on the inner wall of the raised portion 12. . In this way, when the bone conduction horn vibrates, the convex portion 12 of the custom casing 11 is vibrated, thereby causing the bone vibration to realize signal transmission.

Referring to FIG. 5, a circuit board 21 is disposed on an inner wall of the cover plate 20. A frequency divider is disposed on the circuit board 21, and the frequency divider receives an externally input audio signal. For example, the bone conduction earphone is connected to a signal line, and the signal line can receive, for example, An audio signal output by an electronic device such as a headphone, and an audio signal is input to the frequency divider. Alternatively, a wireless receiving device such as a Bluetooth module is disposed on the circuit board 21, and the frequency divider receives the audio signal through the Bluetooth module.

A metal horn is arranged in the cavity, for example, a moving ring horn or a moving iron horn is provided. Of course, a moving ring horn and a moving iron horn can also be provided at the same time. For example, a dynamic horn is provided in the cavity, and the frequency divider outputs an intermediate frequency signal to the bone conduction horn, for example, a signal having a frequency of 500 Hz to 8000 Hz, and the frequency divider also outputs a high frequency signal and a low frequency to the dynamic horn. The signal, for example, a signal having a frequency above 5000 Hz or a signal having a frequency below 1000 Hz. Of course, the above frequencies are only exemplified frequencies. In practical applications, the range of each frequency band can be adjusted according to the application occasion and the frequency of the audio signal.

In this way, the intermediate frequency signal is output through the bone conduction horn, and the bone conduction horn receives the intermediate frequency signal and then vibrates under the driving of the intermediate frequency signal, and drives the custom casing 11 to vibrate, thereby transmitting the acoustic wave signal to the bone of the ear canal, and the person passes through the bone. Vibration to obtain an audio signal. And, the high frequency signal and the low frequency signal are output through the moving coil speaker. Preferably, one or more through holes for outputting a signal are provided on the wall of the custom housing 11, and the high frequency signal and the low frequency signal are output through the through holes. In the ear canal, a shock signal is formed on the eardrum.

Since the high-frequency signal, the low-frequency signal and the intermediate frequency signal are respectively transmitted by different horns, the signals of different frequencies are ensured to obtain an optimal output mode, such as air transmission or transmission through the periosteum, and the transmission quality of the signals of different frequencies is ensured, and the earphone is improved. Quality.

Of course, the metal horn provided in the cavity is not necessarily a moving ring horn, but also a moving iron horn. The frequency dividing can also output a high frequency signal and a low frequency signal to the moving iron horn, and the vibration output signal of the moving iron horn is also passed through the air. Propagation creates a shock on the eardrum.

Moreover, the frequency divider does not necessarily output only the intermediate frequency signal to the bone conduction horn, but also outputs the full frequency signal, that is, regardless of the frequency of the audio signal, the received audio signal is output to the bone conduction horn, the bone conduction horn Although it has good conductivity to the IF signal, it can also output high frequency signals as well as low frequency signals.

In addition, the frequency divider can also output high frequency signals or low frequency signals only to the moving coil speaker or the moving iron speaker, that is, the high frequency signal and the low frequency signal are not simultaneously output to the moving coil speaker or the moving iron speaker, but the two are output. one of the.

In addition, the bone conduction horn is not necessarily disposed on the inner wall of the custom casing 11, but may be disposed on the inner wall of the cover plate 20, and only the bone conduction horn is disposed on the inner wall of the casing 10, and the vibration wave can be transmitted to the periosteum. Just fine.

When manufacturing the bone conduction earphone, the custom outer casing 11 is first manufactured. The customized outer casing 11 is customized according to the shape of the ear canal of the user. For example, according to the shape of the ear canal of the user, the blank is made of agar, and then the customized outer casing 11 is made using the blank. Preferably, the custom outer casing 11 is made of resin. Since the resin has good conductivity to sound waves, the use of a resin to manufacture the custom case 11 can improve the sound quality of the bone conduction earphone.

The custom case 11 is made with a raised portion 12 that projects into the ear canal, so that the corresponding part also needs to be made when making the blank. Moreover, at least one through hole is provided on the side of the custom casing 11 near the ear canal, so that the sound emitted by the moving ring horn or the moving iron horn is transmitted through the through hole into the ear canal.

After the custom casing 11 is manufactured, the cover plate 20 is manufactured. The cover plate 20 can be made of plastic or metal material, and the shape of the cover plate 20 needs to be the same as the shape of the open end 13 of the custom casing 11, and the area is slightly larger than the open end 13 The area, therefore, after the custom casing 11 has been manufactured, the outer contour of the cover 20 is designed according to the shape of the open end 13 of the custom casing 11, and the cover 20 is manufactured.

After the cover 20 is manufactured, a circuit board 21 is disposed on a side of the cover 20 adjacent to the custom housing 11. The circuit board 21 may be a pre-designed circuit board, and a frequency divider may be preset on the circuit board 21, and the frequency divider may be The signal line is connected, or a wireless receiving module such as a Bluetooth module is provided on the circuit board 21.

Next, a bone guiding horn is arranged on the inner wall of the convex portion 12 of the custom casing 11, and a moving ring horn or a moving iron horn is placed in the cavity, and the bone guiding horn and the moving ring horn and the moving iron horn are electrically connected to the frequency dividing. Device. Finally, the cover 20 is fixed to the open end 13 of the custom casing 11, such as by glue bonding or by welding or the like to the cover 20 to the custom casing 11, thereby forming the casing 10 into a cavity, bone The guide horn and the moving ring horn and the moving iron horn are fixed in the cavity.

In addition, if the bone conduction horn is disposed on the inner wall of the cover 20, when the bone conduction earphone is manufactured, after the custom outer casing 11 is manufactured, it is not necessary to fix the bone conduction horn on the inner wall of the custom outer casing 11, but the bone conduction is The horn is disposed on the inner wall of the cover plate 20.

It can be seen that the bone conduction earphone of the invention not only has a bone conduction horn, but also has a moving iron horn or a moving ring horn, and the intermediate frequency signal output by the frequency divider is transmitted to the bone conduction horn, and drives the bone conduction horn to vibrate, and the bone conduction horn The vibration causes the vibration of the custom casing 11 to drive the periosteal vibration, and the audio signal obtained by the user is more clear. In addition, for high-frequency and low-frequency signals, it is transmitted through a moving coil speaker or a moving iron horn to ensure the transmission quality of the high-frequency signal and the low-frequency signal, and improve the sound quality of the bone conduction earphone.

Since the housing 10 has a customized outer casing 11, the customized outer casing 11 can be attached to the bone of the ear canal, and the outer wall of the customized outer casing 11 is in close contact with the bone, and the sound wave can be better transmitted to the inner ear, which greatly enhances the bone conduction earphone. quality.

Of course, in actual application, the present invention has more changes. For example, the custom casing is not made of resin, but is made of other materials such as plastic, nylon or metal materials; or the cover plate uses heat dissipation. The aluminum substrate or the like is preferably made, and such a change can also achieve the object of the present invention.

Industrial applicability

The bone conduction earphone of the invention can receive the audio signal output by the electronic device through the signal line, and thus can be used as an accessory of an electronic device such as a mobile phone or an MP3 player, and can also be used as a wireless bluetooth earphone or the like. In addition, the bone conduction earphone can also be used as a functional earphone such as a hearing aid earphone to meet the demand for high quality earphones.

Claims

A bone conduction earphone characterized by:

a headphone housing, the housing enclosing a cavity, the cavity is provided with a frequency divider and a metal horn, the inner wall of the housing is provided with a bone conduction horn, and the frequency divider is directed to the bone guide The horn outputs an audio signal, and the frequency divider outputs a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal to the metal horn.
The bone conduction earphone of claim 1 wherein:

The housing includes a custom outer casing having an open end, the open end is externally fixed with a cover, at least a portion of the custom outer casing is fitted to the ear canal, and the cover is provided with a circuit board, the frequency divider is disposed on the circuit board, and the bone conduction horn is disposed on an inner wall of the custom housing or an inner wall of the cover.
The bone conduction earphone according to claim 2, wherein:

The custom outer casing is made of resin.
The bone conduction earphone according to any one of claims 1 to 3, characterized in that:

The audio signal output by the frequency divider to the bone conduction horn is a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal.
The bone conduction earphone according to any one of claims 1 to 4, characterized in that:

The metal horn is a moving coil horn, and the frequency divider outputs a full frequency signal, an intermediate frequency signal or a low frequency signal to the moving coil horn.
The bone conduction earphone according to any one of claims 1 to 4, characterized in that:

The metal horn is a moving iron horn, and the frequency divider outputs a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal to the moving iron horn.
A bone conduction earphone according to any one of claims 2 to 6, wherein:

The custom housing includes a raised portion that conforms to the ear canal, the bone guiding horn being disposed on an inner wall of the raised portion.
A method of manufacturing a bone conduction earphone, characterized in that:

Making a headphone housing, the housing comprising a custom housing having an open end and a cover plate secured to the open end, at least a portion of the custom housing being attached to the ear canal Combined

Providing a circuit board on the cover plate, disposing a frequency divider on the circuit board, and disposing a bone conduction horn on an inner wall of the custom outer casing or on the cover plate;

Providing a metal horn in the custom casing, electrically connecting the frequency divider and the bone conduction horn, causing the frequency divider to output an audio signal to the bone conduction horn, and electrically connecting the frequency divider and the The metal horn is configured to cause the frequency divider to output a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal to the metal horn.
The method of manufacturing a bone conduction earphone according to claim 8, wherein:

The custom outer casing is made of resin.
A method of manufacturing a bone conduction earphone according to claim 8 or 9, wherein:

The audio signal output by the frequency divider to the bone conduction horn is a full frequency signal, a high frequency signal, an intermediate frequency signal or a low frequency signal.