CN201234334Y

CN201234334Y - Earphone

Info

Publication number: CN201234334Y
Application number: CNU2008201155495U
Authority: CN
Inventors: 董丽娜
Original assignee: Beijing Magoriental Material Technical Co Ltd
Current assignee: Beijing Magoriental Material Technical Co Ltd
Priority date: 2008-07-21
Filing date: 2008-07-21
Publication date: 2009-05-06
Anticipated expiration: 2018-07-21

Abstract

An earphone comprises a casing, a vibration excitation unit, a vibration output element and an audio input terminal. The vibration excitation unit, the vibration output element and the audio input terminal are fixed inside the casing, and the audio input terminal is electronically connected with the vibration excitation unit so as to provide an audio current signal to the vibration excitation unit; and the vibration excitation unit comprises a magnetic system and a vibration element, wherein one end of the vibration element is fixedly connected with the vibration output element which directly transmits a vibration signal to a human tissue. The earphone is a direct action type earphone so as to be ear-free; and has the advantages of high fidelity, reasonable structure, and convenient manufacturing.

Description

Earphone

Technical field

The utility model relates to a kind of earphone.

Background technology

Common earphone is classified by the transducing mode moving-coil type, moving-iron type, moving-magnetic type and electrostatic etc., by wearing mode classification ear type, ear suspension type and wear-type etc. are arranged, can be divided into style of opening, semi-open type and enclosed type earphone according to the degree of opening of sound to external world.Its basic principle all is the vibrating diaphragm vibration that the exciting unit that is in magnetic field or the electric field is driven be attached thereto, thereby forms sound wave and import in people's the ear in air, vibration ear-drum and make the people listen sound.The earphone that this class causes the eardrum sounding by sound wave needs earphone placed earhole or overlay on the earhole to answer sound effectively, will form certain " sound insulation " so to external world.Consequent problem is, listens earphone when people think the limit, when chatting such as limit and friend, will be restricted.Even use opening earphone, although can hear external sound, sound answers effect and answering effect and all can be affected earphone to external world.

Thereby, need a kind ofly can " liberate " earphone that ears can obtain good tonequality again.

The utility model content

The purpose of this utility model provides a kind of earphone, the audio frequency vibration signal that this earphone produces need not to form sound wave and imports in people's the ear again in air, and can be designed to the form that can contact and the audio frequency vibration signal directly can be imported into auditory nerve, thereby answered by vibrating output element with near the human body the auricle.

The purpose of this utility model is to realize by the earphone of following structure.

A kind of earphone, it comprises shell, vibrational excitation unit, vibration output element and audio frequency input lead, described vibrational excitation unit, vibration output element and audio frequency input lead are fixed in the described shell, and described audio frequency input lead is electrically connected so that the tone currents signal to be provided to it with described vibrational excitation unit.Described vibrational excitation unit comprises magnetic circuit system and vibrating elements, wherein, and described vibrating elements one end and described fixed connection of vibration output element that directly vibration signal is passed to tissue.When behind described vibrational excitation unit input tone currents signal, described vibrating elements produces the audio frequency vibration signal under the acting in conjunction of described magnetic circuit system and described current signal, described audio frequency vibration signal pass to the fixed described vibration output element that is connected of described vibrating elements, thereby described vibration output element is attached near the auricle human body, can transmit described audio frequency vibration signal to auditory nerve, can hear sound thus.

On the one hand, the described vibrating elements in the described vibrational excitation unit can be a coil.Be passed into tone currents signal described coil afterwards and in the magnetic field that produces by described magnetic circuit system, produce the audio frequency vibration signal because of the effect that is subjected to Lorentz force.

Preferably, described magnetic circuit system comprises yoke and permanent magnet.

Preferably, described coil is by the spiral hollow cylinder that is entwined of copper enamelled wire.

Preferably, described yoke is the hollow cylindrical with bottom, and described permanent magnet is cylindrical; Columniform described permanent magnet is located in the described yoke, and places the bottom of described yoke with an end vertical type, and the other end stretches in the described coil.

Preferably, the magnetic gap in the described magnetic circuit system is 0.5-1.5mm.

Preferably, the quality of described coil is 0.5-1.5g.

Preferably, described permanent magnet is the Nd-Fe-B permanent magnet of the above trade mark of N35.

On the other hand, the described vibrating elements in the described vibrational excitation unit can be the magnetostrictor of being made by magnetostrictive material.

Preferably, described magnetic circuit system comprises permanent magnet and excitation coil, and described excitation coil is by the spiral hollow cylinder that is entwined of copper enamelled wire; Described excitation coil is fixed in the center of described permanent magnet with an end, and the other end is a free end; Described magnetostrictor passes the center of described excitation coil, and the relative other end of the end with described vibration output element connection of described magnetostrictor is contacted with described permanent magnet.When the tone currents signal that is provided by the audio frequency input lead passes through excitation coil, the magnetic field that excitation coil can change, magnetostrictor is under the excitation of this variation magnetic field, because of himself length flexible will produce and the vibration signal of tone currents signal same frequency.

Compared with prior art, the utlity model has following characteristics:

(1) acoustic signals is not to import in the ear by air dielectric, but imports auditory nerve into by solid dielectric.

(2) the fidelity height of sound wave.Frequency range is between 50Hz-12500Hz; The slope of frequency response curve is no more than per 0 octave 9dB; The difference of unit, left and right sides average sound pressure level in same octave bandwidth is no more than 2dB in 250Hz-800Hz; In the 100Hz-5000Hz scope, when sound pressure level was 100db, harmonic distortion generally was no more than 1%, was no more than 3% at most.

(3) good environmental adaptability.

The utility model can obtain to use widely, for example is used for sound-producing device that PC, MP3 and mobile communication use etc.

Earphone of the present utility model is a Direct Action Type, and it need not use duct and can hear sound, has liberated ears, and has had high-fidelity characteristic, rational in infrastructure, easily manufactured.

Description of drawings

Fig. 1 is the structural representation of earphone of the present utility model;

Fig. 2 is the detailed cutaway view that the vibrational excitation unit of an embodiment in Fig. 1 earphone is shown; And

Fig. 3 is the detailed cutaway view that the vibrational excitation unit of another embodiment in Fig. 1 earphone is shown.

Embodiment

Below with reference to accompanying drawings, in conjunction with specific embodiments, describe the utility model in detail.

As shown in Figure 1, earphone has shell 1, vibrational excitation unit 2 and vibration delivery 3 (a kind of vibration output element) and audio frequency input lead 4.Wherein, vibrational excitation unit 2, vibration delivery 3 and audio frequency input lead 4 are fixed in the shell 1, and audio frequency input lead 4 is electrically connected with vibrational excitation unit 2 so that the tone currents signal to be provided to it.Vibrational excitation unit 2 among Fig. 1 can be realized by the structure of Fig. 2 or Fig. 3.Vibrational excitation unit 2 comprises magnetic circuit system and vibration delivery 3, wherein, and vibrating elements one end and 3 fixed connections of described vibration delivery that vibration signal are directly passed to tissue.When behind vibrational excitation unit 2 input tone currents signals, vibrating elements produces the audio frequency vibration signal under the acting in conjunction of magnetic circuit system and current signal, this audio frequency vibration signal pass to the fixed vibration delivery 3 that is connected of vibrating elements, just can transmit described audio frequency vibration signal and will vibrate when delivery 3 is attached near the auricle human body, can hear sound thus to auditory nerve.

Fig. 2 shows the vibrational excitation unit 2 of an embodiment.Vibrating elements in this vibrational excitation unit 2 is a coil 23.Vibrational excitation unit 2 also comprises yoke 21 and permanent magnet 22.Wherein, yoke 21 is for having the hollow cylindrical of bottom, and permanent magnet 22 is cylindrical; The internal diameter of yoke 21 is slightly larger than the diameter of permanent magnet 22, makes cylindrical permanent magnet 22 be suitable for placing with an end vertical type bottom centre of yoke 21.Coil 23 can be for by the spiral hollow cylinder that is entwined of suitable fine wire well known in the art, and wherein fine wire can be copper free wire or copper-in-aluminum enameled wire etc.The internal diameter of coil 23 is slightly larger than the diameter of permanent magnet 22, make and be suitable for the end of permanent magnet 22 from coil 23 stretched into the coil, the other end of coil 23 directly with vibrate 3 fixed connections of delivery, for example can vibration can be directly passed to vibration delivery 3 when vibrating by bonding mode with convenient coil 23.Wherein the relative other end in order to stretch into permanent magnet 22 of the end with being fixed in vibration delivery 3 of coil 23 is a free end.When the tone currents signal that is provided by audio frequency input lead 4 passed through coil 23, hot-wire coil 23 can be subjected to the effect of Lorentz force in by yoke 21 and permanent magnet 22 formed magnetic circuits, thereby vibrates.This vibration is directly exported to tissue by vibration delivery 3.In use, will vibrate delivery and be attached near the human body of auricle, directly import auditory nerve into, can hear sound thus by the muscle or the skeletal tissue of human body.

In the concrete Application Design of present embodiment, need to consider to use the high permanent magnetic material of magnetic energy, as far as possible little magnetic gap, and as far as possible little oscillating mass are to obtain desirable acoustic efficiency.For example, can select the Nd-Fe-B permanent magnet of the above trade mark of N35 for use, magnetic gap is controlled in the 0.5-1.5mm, and the quality control of vibrator coil is in 0.5-1.5g.

Fig. 3 shows the vibrational excitation unit 2 of another embodiment.Vibrating elements in this vibrational excitation unit 2 is the magnetostrictor of being made by magnetostrictive material 27.Vibrational excitation unit 2 also comprises permanent magnet 25 and excitation coil 26.Wherein, permanent magnet 25 is thin cylinder, and magnetostrictor 27 is a cylinder.Identical with the embodiment of Fig. 2, an end of magnetostrictor 27 directly is connected with vibration delivery 3.Equally, excitation coil 26 can be for by the spiral hollow cylinder that is entwined of suitable fine wire well known in the art, and wherein fine wire can be copper free wire or copper-in-aluminum enameled wire etc.Excitation coil 26 internal diameters are slightly less than the diameter of permanent magnet 22, be suitable for being fixed in an end center of the circular surface of described permanent magnet, and its other end are a free end; Its internal diameter is slightly larger than the diameter of magnetostrictor 27, is suitable for making magnetostrictor 27 to pass from its center, and the relative other end of the end with described vibration output element connection of described magnetostrictor is contacted with the circular surface of permanent magnet 25.Permanent magnet 25 plays the effect of tail quality and compressive pre-stress mechanism simultaneously; Magnetostrictive material can be the metal magnetostrictive material, can be the intermetallic compound magnetostrictive material, also can be the composite materials with Magnetostrictive Properties.When the tone currents signal that is provided by audio frequency input lead 4 passes through excitation coil 26, the magnetic field that excitation coil 26 can change, by the magnetostrictor 27 after the polarization of permanent magnet 25 and compressive pre-stress under the excitation of this variation magnetic field, because of himself length flexible produces and the vibration of tone currents signal same frequency.This vibration is directly exported to tissue by vibration delivery 3.In use, will vibrate delivery and be attached near the human body of auricle, can directly import auditory nerve into, can hear sound thus by the muscle or the skeletal tissue of human body.

By above explanation as can be seen, although the excitation coil in the present embodiment 26 can be identical with coil 23 materials and form in embodiment illustrated in fig. 2, act on difference fully owing to its set-up mode is different.After coil 23 energisings, because of stressed making in magnetic field vibrated himself, and the magnetic field that changes after excitation coil 26 energisings vibrates the magnetostrictor that is placed in one.

In the Application Design of present embodiment, need:

(1) high performance magnetostrictive material promptly have high magnetostriction coefficient and low saturation magnetization field;

(2) prestress need be applied, otherwise the frequency multiplication phenomenon of audio frequency can be occurred.The size of prestress is wanted suitably;

(3) to select suitable bias magnetic field.

When implementing, can select the rare earth ultra-magnetostriction material of TbDyFe base is the transducing sensing unit, applies the prestress of 5-15MPa, selects the bias magnetic field of 20-35kA/m, to obtain desirable audio.

It will be understood by those skilled in the art that the needs that directly vibrate to human body output in order to satisfy, employed vibration delivery 3 should be rigid material in the utility model, for example similar suitable material such as iron, alloy, plastics.In addition, in order to increase the comfort that it contacts with human body, can correspondingly coat one deck flexible membrane in the appearance of rigid material.

Those skilled in the art should understand, the structure of directly transmitting vibration to human body by the vibration output element of the present utility model is applicable to the earphone of introducing any known type, make it to transform as direct dynamic structure, for example be applicable to the earphone of various transducing modes, should there be various structure vibrational excitation unit wherein mutually.So the utility model is not limited to specific embodiment.

Claims

1, a kind of earphone, it comprises shell, vibrational excitation unit, vibration output element and audio frequency input lead, described vibrational excitation unit, vibration output element and audio frequency input lead are fixed in the described shell, and described audio frequency input lead is electrically connected with described vibrational excitation unit to provide the tone currents signal to described vibrational excitation unit; Described vibrational excitation unit comprises magnetic circuit system and vibrating elements, it is characterized in that: described vibrating elements one end and described fixed connection of vibration output element that vibration signal is directly passed to tissue.

2, earphone according to claim 1 is characterized in that: described vibrating elements is a coil.

3, earphone according to claim 2 is characterized in that: described magnetic circuit system comprises yoke and permanent magnet.

4, earphone according to claim 2 is characterized in that: described coil is by the spiral hollow cylinder that is entwined of copper enamelled wire.

5, earphone according to claim 4 is characterized in that: described yoke is the hollow cylindrical with bottom, and described permanent magnet is cylindrical; Columniform described permanent magnet is located in the described yoke, and places the bottom of described yoke with an end vertical type, and the other end stretches in the described coil.

6, earphone according to claim 5 is characterized in that: the magnetic gap in the described magnetic circuit system is 0.5-1.5mm.

7, require each described earphone among the 2-6 according to aforesaid right, it is characterized in that: the quality of described coil is 0.5-1.5g.

8, earphone according to claim 7 is characterized in that: described permanent magnet is the Nd-Fe-B permanent magnet of the above trade mark of N35.

9, earphone according to claim 1 is characterized in that: the magnetostrictor of described vibrating elements for being made by magnetostrictive material.

10, earphone according to claim 9 is characterized in that: described magnetic circuit system comprises permanent magnet and excitation coil, and described excitation coil is by the spiral hollow cylinder that is entwined of copper enamelled wire; Described excitation coil is fixed in the center of described permanent magnet with an end, and the other end is a free end; Described magnetostrictor passes the center of described excitation coil, and the relative other end of the end with being connected to described vibration output element of described magnetostrictor is contacted with described permanent magnet.