JP2008092460A - Bone conduction speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that it is difficult to properly use air conduction sound and bone conduction sound since a user gets used to acoustic signals and becomes difficult to distinguish the air conduction sound the bone conduction sound, in a multifunction device in which a bone conduction speaker and an acoustic speaker are integrally constituted. <P>SOLUTION: By using a structure wherein a movable part provided with a magnet is vibrated and the bone conduction sound is transmitted to the user, the bone conduction speaker and a vibration device are integrally constituted. Thus, when using an alarm clock function and an alarm function to be used in emergency or the like, it is made possible to output perceivable signals using sensory vibrations. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bone conduction speaker that transmits bone conduction sound to a user by vibration.

  Currently, a bone conduction speaker has been developed in which a vibrating piece is brought into contact with the periphery of the user's skull and a sound is transmitted to the user using a bone conduction sound generated by the vibration of the vibrating piece. These have the advantage of being able to transmit voice to the user even under noisy conditions, and are widely used.

  The advantage of the bone conduction speaker is caused by the difference in the transmission path between the air conduction sound and the bone conduction sound. In other words, the air conduction sound emitted by a normal speaker transmits sound from the outer ear through the middle ear to the inner ear, whereas the bone conduction sound emitted by the bone conduction speaker directly transmits sound to the inner ear. For this reason, sound transmission using bone-conducted sound is characterized by less interference due to ambient noise than air-conducted sound.

  As such a bone conduction speaker, Japanese Patent Laid-Open No. 58-182398 (hereinafter referred to as Patent Document 1) is disclosed. This is a single device equipped with a transmission / reception function using bone conduction sound and a voice transmission function using air conduction sound. Depending on the application, it is possible to selectively use the bone conduction sound with the contact portion as the transmission path and the air conduction sound with the resonance pipe provided separately as the transmission path.

  Separately, a bone conduction speaker having a diaphragm for sound reproduction and a diaphragm for transmitting bone conduction sound in one device is disclosed as JP-T-2006-501756 (hereinafter referred to as Patent Document 2). It is possible to use air conduction sound and bone conduction sound properly. In addition, the transmission path of the bone conduction sound and the air conduction sound is combined into one, and there is an advantage that two types of sound transmission formats can be used in a single transmission path.

JP 58-182398 A Special table 2006-501756

  However, when the bone conduction speaker described in the patent document is used for a hearing aid or the like, its function is limited to the sound transmission means. For this reason, when transmitting a warning signal or a signal such as a timer, the user gets used to the sense of air conduction sound and bone conduction sound, which makes it difficult to recognize the signal.

  In addition, since the bone conduction speaker described in the above-mentioned patent document uses a structure that uses air conduction sound, there is a problem in that it is difficult to hear surrounding sounds when reproducing the air conduction sound.

In view of the above problems, an object of the present invention is to provide a bone conduction speaker including information transmission means other than audio output.

  In order to solve the above problems, in the invention according to claim 1, a movable part is configured using a magnet magnetized in a vibration direction and a magnet yoke sandwiching the magnet in the vibration direction, and the movable part Is used as a vibrator. For this reason, in the bone conduction speaker of the present invention, transmission of bone conduction sound to the user and transmission of bodily sensation vibration can be performed with a single device.

  By using the transmission format, the signal according to the first aspect of the invention can be transmitted in a form that can be easily recognized by the user by bodily sensation vibration even during reproduction of bone conduction sound. ing. In addition, a magnet yoke made of a magnetic material that sandwiches the magnet in the vibration direction is provided in the magnet, and a coil yoke made of the same magnetic material is provided in the coil, thereby collecting magnetic flux in the yoke and improving magnetic efficiency. Can do.

  According to a second aspect of the present invention, in the bone conduction speaker according to the first aspect, a structure is used in which the amplitude of the magnet is limited by a magnetic gap formed between the magnet yokes. For this reason, it is not necessary to provide a support material such as a suspension used in the conventional bone conduction speaker, and the bone conduction speaker can be operated with high followability with respect to the input signal when the movable part including the magnet is driven. .

  In the invention according to claim 3, a structure in which a magnetic material is laminated on the coil yoke mounted on the bone conduction speaker according to claim 1 or 2 is used. For this reason, compared with the case where a coil yoke having a uniform structure is used, when the bone conduction speaker is driven, eddy current loss generated in the coil yoke can be reduced, and the driving efficiency of the bone conduction speaker can be reduced. It becomes possible to improve.

  Further, by using the invention according to claim 4, it is possible to control the vibration generating function and the reproduction of the bone conduction sound by the input frequency to the coil with respect to the bone conduction speaker according to claims 1 to 3. It becomes possible. In addition, since the bone conduction speaker is controlled by the signal frequency input to the coil, there is an advantage that two kinds of operations can be performed with one system input.

  This advantage is due to the drive structure that uses the magnetic force between the magnet and the coil that is generated when a current is applied to the coil, and the frequency band of the bone conduction sound and the frequency band of the sensible vibration are selective to the coil. By inputting into, it is possible to control two functions: the generation of body vibration and the generation of bone conduction sound. In addition, since the sound is transmitted to the user only by the bone conduction sound, the sound can be transmitted to the user without blocking surrounding sounds.

As described above, the bone conduction speaker of the present invention has the problem that it is difficult to distinguish between the transmission means in the bone conduction speaker having two types of output forms of conventional bone conduction sound and air conduction sound. This is solved by using two types of output forms, bone conduction sound.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a side sectional view of a bone conduction speaker used in this embodiment, and FIG. 2 is a sectional perspective view of the bone conduction speaker. In the bone conduction speaker of the present embodiment, the movable portion is constituted by the bearing 12, the weight 10 fitted to the outer periphery of the bearing 12, the magnet 9 fixed to the outer periphery of the weight 10, and the two magnet yokes 8 fixed to the top and bottom of the magnet. A was configured.

  Further, the two coils 6a and 6b wound around the vibration direction of the movable part A, the two coil yokes 5 disposed between the two coils 6a and 6b, and the two coils 6a and 6b are electrically connected. The terminal 4 that allows connection and signal input from the outside of the bone conduction speaker, the terminal fixing portion 7 that is disposed on the outer periphery of the coils 6a and 6b and fixes the terminal 4 to the bone conduction speaker body, and the terminal fixing portion 7 are accommodated. The fixing part B is constituted by the case 2 and the cover 3 to be performed.

  In addition, the shaft 11 provided so as to penetrate the bearing 12 provided in the movable part A penetrates and is fixed to the center of the case 2 and the cover 3. By using such a structure, the vibration direction of the movable part A is limited, and stable bone conduction sound and bodily sensation vibration can be provided to the user via the contact pad 1 attached to the fixed part B. It was.

  The bone conduction speaker 13 according to the present embodiment is used in contact with a relatively thin portion on the temporal bone, unlike the conventional bone conduction speaker, which is worn by closing the ear canal described above. A structure for transmitting the sound reproduction and the occurrence of the body vibration to the user may be used.

  By using the structure, the bone conduction speaker according to the present embodiment can provide the above-described sound reproduction function by the bone conduction sound and the notification function by the body vibration by a single device. For this reason, by switching the frequency or amplitude of the signals input to the coils 6a and 6b, it is possible to clearly recognize an alarm signal or the like by the output using body vibration even during the reproduction of the bone conduction sound. It becomes.

  Further, regarding the control method, a configuration in which the operation of the device is selected depending on the frequency of the input signal may be used. By using this configuration, the device can be easily controlled.

  In addition to the above advantages, the bone conduction speaker described in the present embodiment uses a configuration in which the magnet 9 provided in the movable portion A is formed in an annular shape and the weight 10 is added to the inner ring portion of the magnet 9, so The user was able to easily perceive when generating the error. Further, the weight 10 may be omitted. In this case, sufficient bodily sensation vibration can be obtained by adjusting the input frequency or the like even if the movable part A is light.

  In the present embodiment, two coil yokes 5 made of a magnetic material may be provided between the two coils 6a-6b provided on the outer periphery of the movable part A. In this case, the movable part A is supported by the magnetic force acting between the coil yoke 5 and the magnet 9 provided in the movable part A when not driven, and there is no support material such as a suspension even when there is no input to the coils 6a and 6b. Thus, the movable part A is held, and the eddy current during driving can be reduced as compared with the case where the coil yoke 5 is provided with a single structure.

  Furthermore, when the structure described above is used, the bone conduction speaker described in the present embodiment can be driven in a state where the acceleration at the time of vibration is always high without being disturbed by the support material when the movable part A is vibrated. In addition, by providing the coils 6a and 6b in the fixed portion B, it is possible to reduce the disconnection of the coil lead wire that is the signal input portion and extend the driving life of the entire bone conduction speaker.

  In this embodiment, the magnetic flux of the magnet 9 is concentrated on the end of the magnet yoke 8, and the magnetic flux generated by the coils 6 a and 6 b to which signals of the same frequency are input is concentrated on the coil yoke 5. A magnetic force works between the end of the magnet yoke 8 and the movable part A is driven. For this reason, the amplitude of the movable part A is limited by the magnetic gap formed by the two magnet yokes 8 fixed above and below the magnet 9, and the movable part A can be used without colliding with the inner walls of the case 2 and the cover 3 during driving. We were able to.

  As described above, by using the bone conduction speaker described in the present embodiment, it has become possible to obtain a bone conduction speaker including two types of information transmission means of bone conduction sound and body vibration in this embodiment. .

Side sectional view in an embodiment of the present invention Sectional perspective view in the Example of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Contact pad 2 Case 3 Cover 4 Terminal 5 Coil yoke 6a, 6b coil 7 Terminal fixing | fixed part 8 Magnet yoke 9 Magnet 10 Weight 11 Shaft 12 Bearing 13 Bone conduction speaker A Movable part B Fixed part

Claims (4)

A bone conduction speaker for transmitting bone conduction sound to a user,
A magnet magnetized in the vibration direction;
A magnet yoke made of a magnetic material sandwiching the magnet in the vibration direction;
A coil disposed on the side of the magnet and a coil yoke made of a magnetic material;
A bone conduction speaker that generates body vibration and reproduces bone conduction sound by vibration of the magnet.
The bone conduction speaker according to claim 1,
A bone conduction speaker that limits the amplitude due to vibration of the magnet by a magnetic gap formed between the magnet yokes.
The bone conduction speaker according to claim 1 or 2,
A bone conduction speaker in which the coil yoke is formed of laminated magnetic materials.
The bone conduction speaker according to claims 1 to 3,
A bone conduction speaker that controls the generation of body vibration and the reproduction of bone conduction sound by changing the frequency of a signal input to the coil.

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