CN202019437U - Enclosed receiver with power linear frequency response character - Google Patents

Abstract

The utility model relates to a communication electroacoustic device, in particular to an enclosed receiver with a power linear frequency response character, which comprises a front cover, a main body, a rear cover, a sound film, a hearing acid coil, a damped system and a wiring board. A sound leaking notch I is arranged on the front cover, a sound leaking notch II is arranged at a position corresponding to the front cover on the main body, and a through hole is arranged on a vibrating diaphragm of the sound film. The damped system formed by sound mixing paper and a damped block is arranged in the rear cover, and a gap is arranged between the damped system and the rear cover. A bayonet corresponding to a locating groove on the main body is arranged on the front cover which is covered on the main body, and the sound leaking notch I arranged on the front cover corresponds to the sound leaking notch II arranged on the main body. The enclosed receiver with the power linear frequency response character has the advantages that nonlinear difference of a sound volume (sound pressure) caused by different power inputs is solved thoroughly due to an ingenious acoustics structural design, and a problem that the sound volume of a low frequency range is unstable when the receiver is used as a sound source terminal and plays under a condition of different power inputs.

Description

A kind of closed receiver with the linear Frequency Response of power

Technical field

The utility model relates to the communication electro-acoustic element, relates in particular to a kind of closed receiver with the linear Frequency Response of power.

Background technology

The situation of the receiver of existing in the market sealing back cavity: having the receiver that seals back cavity with φ 38mm * H:21mm is that introduction is done in representative, and this product vibrating diaphragm material is PET, and thickness is 0.1mm, and AC impedance is 150 ohm; Do test comparison with following four kinds of different capacities: 0.0107mW, 0.42mW, 1.056mW, 2.11mW, be converted into corresponding voltage and be respectively 40mV, 251mV, 398mV, 562mV, test acoustic pressure result unifies to convert dBPa/V(to again to be convenient to compare under same picture frame).Test result is: because the power that the vibrating diaphragm compliance causes is non-linear, cause the pressure frequency response curve envelope scattered error (the most about 3-5dB) to occur at low frequency region (before the 1kHz), see Fig. 1 for details.Like this, behind the different voltages of client's complete machine feed-in, the sound that plays out by terminal part-receiver big or small sound (with medium-high frequency relatively) will occur in low-frequency range, thereby influence call tone quality, to the pursuit of sound day by day perfectly instantly, such defective obviously is to need to improve.

Summary of the invention

The utility model is for overcoming the deficiencies in the prior art part, purpose is to provide a kind of closed receiver with the linear Frequency Response of power, by on receiver protecgulum and main body, increasing acoustic construction unit (Acoustic Leak groove), changed the acoustics load characteristic, utilize the adjustment of acoustic impedance to suppress the nonlinear change of receiver vibrating diaphragm mechanical compliance under the different input electric powers, solved the acoustic pressure nonlinear problem of low-frequency range under the different input electric powers.

The utility model is to achieve the above object by the following technical programs: a kind of closed receiver with the linear Frequency Response of power, comprise protecgulum, main body, bonnet, sound film, hearing aid circle, damping system, terminal block, be provided with sound leakage notch I on the described protecgulum, be provided with sound leakage notch II accordingly, on sound vibration of membrane diaphragm, be provided with through hole in described main body and protecgulum; Be provided with in the bonnet by adjustable sound paper and damping block and constitute damping system, be provided with the gap between damping system and the bonnet; Described main body comprises that T type hollow magnetic conductor I, magnet II, magnetic conductor III, fixed support, magnet II, magnetic conductor III are socketed on the T type hollow magnetic conductor I, fixed support supports T type hollow magnetic conductor I, magnet II, magnetic conductor III, be provided with the gap between T type hollow magnetic conductor I, magnet II, the magnetic conductor III, bonnet and main body close connection of full envelope; The sound film is fixed on the main body, the hearing aid circle is fixed on the protecgulum, and terminal block is bonded in the main body side, protecgulum be provided with main body on the corresponding bayonet socket of location notch, the protecgulum lid is located on the main body, and it is corresponding that sound leakage notch I and the main body that protecgulum is provided with is provided with sound leakage notch II.

As preferably, main body is provided with the lead-in wire groove.

As preferably, described sound film is made up of vibrating diaphragm and voice coil loudspeaker voice coil.

The beneficial effects of the utility model: when acoustic construction design cleverly can thoroughly solve different input electric power, the non-linear difference of volume (acoustic pressure) that produces has solved the problem that low-frequency range volume when receiver is as the source of sound terminal plays under the different input electric powers has big or small sound.Be example with the said goods still, this monomer after the design is at IEC318(B﹠amp; K Type:4153) tests on the airtight artificial ear, import 40mV, 251mV, 398mV, 562mV voltage respectively, from test result as can be seen, in voice frequency range, low-frequency range is substantially linear (coincidence) before 1000Hz, sees down sound pressure frequency response curve figure among Figure 10 for details.

Description of drawings

Fig. 1 is the pressure frequency response curve chart described in the background technology;

Fig. 2 is the cutaway view of receiver;

Fig. 3 is the enlarged drawing at A place among Fig. 2;

Fig. 4 is the upward view of protecgulum;

Fig. 5 is the B-B cutaway view of Fig. 4;

Fig. 6 is the vertical view of protecgulum;

Fig. 7 is the vertical view of main body;

Fig. 8 is the C-C cutaway view of Fig. 7;

Fig. 9 is the upward view of main body;

Figure 10 is the pressure frequency response curve chart of receiver described in the utility model;

Figure 11 is that resonance frequency is with amplitude change figure;

Figure 12 is the complete simulated line figure of receiver;

Figure 13 is the principle reduced graph of Figure 12.

Embodiment

Embodiment 1: below in conjunction with specific embodiment the utility model is described further, but protection range of the present utility model is not limited in this:

As Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, shown in Figure 9, a kind of closed receiver with the linear Frequency Response of power, comprise protecgulum 3, main body, bonnet 11, sound film, hearing aid circle 6, damping system, terminal block 14, be provided with sound leakage notch I2 on the described protecgulum 3, be provided with sound leakage notch II1 accordingly, on sound vibration of membrane diaphragm 4, be provided with through hole 15 in described main body and protecgulum 3; Be provided with in the bonnet 11 by adjustable sound paper 13 and damping block 12 and constitute damping system, be provided with the gap between damping system and the bonnet 11; Described main body comprises T type hollow magnetic conductor I9, magnet II8, magnetic conductor III7, fixed support 10, magnet II8, magnetic conductor III7 are socketed on the T type hollow magnetic conductor I9, fixed support 10 supports T type hollow magnetic conductor I9, magnet II8, magnetic conductor III7, be provided with the gap between T type hollow magnetic conductor I9, magnet II8, the magnetic conductor III7, bonnet 11 and main body close connection of full envelope; Described sound film is made up of vibrating diaphragm 4 and voice coil loudspeaker voice coil 5, the sound film is fixed on the main body, hearing aid circle 6 is fixed on the protecgulum 3, terminal block 14 is bonded in the main body side, protecgulum 3 be provided with main body on location notch 18 corresponding bayonet sockets 16, protecgulum 3 lids are located on the main body, and it is corresponding that sound leakage notch I2 and the main body that protecgulum 3 is provided with is provided with sound leakage notch II1, and main body is provided with lead-in wire groove 17.

Core technology of the present utility model is: independently proposing increases a sound leakage notch II1 above the lead-in wire groove 17 of main body, as Fig. 2, Fig. 7, shown in Figure 8; Simultaneously increase sound leakage notch I2 in protecgulum 3 corresponding main body sound leakage notch II1 positions, as Fig. 2,, Fig. 4, shown in Figure 5; For the ease of the location, on protecgulum 3 and fixed support 10, open a primary and secondary draw-in groove respectively, location notch 18 and corresponding bayonet socket 16 are as Fig. 4, Fig. 7, shown in Figure 8; Realized the local conducting of vibrating diaphragm chamber, front and back and space outerpace then by the through hole on the vibrating diaphragm 15, as shown in Figure 2; Connect the front and back cavity of vibrating diaphragms by the through hole on the vibrating diaphragm 15, make under voice coil loudspeaker voice coil 5 effects of energising back, to produce vibration, disappointing groove and extraneous conducting that the Pneumatic pipe cleaner that vibration produces is crossed protecgulum and rack body at electromagnetic field.

Like this,, changed the acoustics load characteristic, utilized the adjustment of acoustic impedance to suppress the nonlinear change of receiver vibrating diaphragm mechanical compliance under the different input electric powers by on protecgulum and main body, increasing acoustic construction unit (Acoustic Leak groove).Simultaneously, because the sound leakage slot part makes that with extraneous free field conducting the low frequency leakage of frequency response curve is serious, in order to remedy this low frequency loss, used the compliance vibrating diaphragm of material (PET 0.05mm) preferably instead, realized the lifting to the low-frequency range sound pressure level in the test of IEC318 artificial ear of conventional moving-coil type (the sealing back cavity is arranged) receiver, fully take into account simultaneously the requirement of high band pressure response, finally realized the acoustic pressure nonlinear problem of low-frequency range under the different input electric powers.

The explanation of the utility model principle:

1, vibrational system compliance power under the situation of different input electrical signal sizes is non-linear:

The compliance of vibrational system occurred under the situation of different input electrical signal sizes non-linear: under the lower situation of input voltage, along with the increase of input voltage, displacement resonance peak reach, promptly compliance becomes big; But after voltage was increased to a certain size, compression phenomena had appearred in amplitude, moved behind the formant, and this moment, equivalent compliance diminished, and can judge that thus non-linear that frequency response curve occurs after the different signal of telecommunication size of input is unavoidable, as shown in figure 11.

2, the complete simulated line principle of receiver described in the utility model, as shown in figure 12:

The equivalent acoustic element of protecgulum leakage grooves correspondence is the acoustic resistance Ra8 harmony mass M a8 in the diagram, and the equivalent acoustic element of the punching correspondence on the vibrating diaphragm is the acoustic resistance Ra7 harmony mass M a7 in the diagram, is to follow the coupling cavity (artificial ear) of back in parallel from intuitively seeing.These several acoustic elements have changed acoustics load (impedance).

Complete electromechanical-acoustic analogy analogous diagram is understood not too easily, can convert the mechanics schematic diagram of simplification to, and as shown in figure 13, Zam represents that complicated acoustics load transfer is the mechanics load impedance.If do not consider the acoustics load, then only remaining three primary element: mechanical resistance Rm, mechanical compliance Cm, quality Lm.Total mechanical impedance just is made of jointly these three elements and Zam.Facts have proved that LF-response mainly is by compliance control, just understand than being easier to according to this figure that " inductance " Lm (quality) is inoperative substantially during low frequency, that play a major role is exactly " electric capacity " Cm (mechanical compliance); " inductance " just worked during medium-high frequency, and this moment " electric capacity " is inoperative substantially, is the quality control district this moment.When LC resonance, Frequency point is by LC control, and the height of resonance peak is by " resistance " Rm (mechanical resistance) control, and be exactly resistive controlled area this moment.

Because mechanical compliance Cm meeting emergent power is non-linear, promptly Cm is not a constant, so it is inconsistent to cause pressure response can occur when low frequency.Change the harmful effect that brings in order to suppress this Cm, just by changing acoustics load Zam, change total mechanical impedance, two kinds of effects: the one, the control frequency scope of the resistive controlled area of change, seeing in conjunction with receiver described in the utility model, mainly is to increase the characteristic that the Acoustic Leak groove changes acoustic impedance; The 2nd, the frequency original position (also having compensated the leakage loss of low frequency simultaneously) of change compliance controlled area, receiver described in the utility model shows as vibrating diaphragm and changes PET0.05mm into by original PET0.1mm.The change method of acoustics load in fact can be various, and this test example only is a kind of, but more convenient enforcement and do not increase man-hour and cost.

Every receiver that has sealing back cavity cavity is used this technology and all can be improved to the power nonlinear problem of frequency response curve low-frequency range, certainly may bring the acoustic pressure loss of low-frequency range thus, total but can regulate and control and compensate by system's mechanical compliance (or acoustic compliance), be exactly the most effective direct way adopts the bigger vibrating diaphragm of relative compliance.In the same way, different acoustics loading conditions leaks coupling cavity, non-sealing back cavity, non-sealing ante-chamber as height, can improve LF-response by comprehensive adjustment acoustic construction and compliance, damping.Not only the frequency response of receiver can be with this principle and method adjustment, and all kinds of earphones can adopt this principle design equally.

Above described be specific embodiment of the utility model and the know-why used; if comply with the change that conception of the present utility model is done; when the function that it produced does not exceed spiritual that specification and accompanying drawing contain yet, must belong to protection range of the present utility model.

Claims (3)

1. closed receiver with the linear Frequency Response of power, comprise protecgulum (3), main body, bonnet (11), sound film, hearing aid circle (6), damping system, terminal block (14), it is characterized in that being provided with sound leakage notch I(2 on the described protecgulum (3)), be provided with sound leakage notch II(1 accordingly at described main body (10) and protecgulum (3)), on sound vibration of membrane diaphragm (4), be provided with through hole (15); Be provided with in the bonnet (11) by adjustable sound paper (13) and damping block (12) and constitute damping system, damping system and bonnet are provided with the gap between (11); Described main body comprises T type hollow magnetic conductor I(9), magnet II(8), magnetic conductor III(7), fixed support (10), magnet II(8), magnetic conductor III(7) be socketed in T type hollow magnetic conductor I(9) on, fixed support (10) support T type hollow magnetic conductor I(9), magnetic conductor III(7 magnet II(8)), T type hollow magnetic conductor I(9), be provided with the gap, bonnet (11) and main body close connection of full envelope magnetic conductor III(7 magnet II(8)); The sound film is fixed on the main body, hearing aid circle (6) is fixed on the protecgulum (3), terminal block (14) is bonded in the main body side, protecgulum (3) be provided with main body on the corresponding bayonet socket of location notch (18) (16), protecgulum (3) lid is located on the main body sound leakage notch I(2 that protecgulum (3) is provided with) be provided with sound leakage notch II(1 with main body) corresponding.

2. a kind of closed receiver with the linear Frequency Response of power according to claim 1 is characterized in that main body is provided with lead-in wire groove (17).

3. a kind of closed receiver with the linear Frequency Response of power according to claim 1 is characterized in that described sound film is made up of vibrating diaphragm (4) and voice coil loudspeaker voice coil (5).

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