CN204350270U - A kind of high sensitive miniature loudspeaker box - Google Patents

Abstract

The utility model is adopted as a kind of high sensitive miniature loudspeaker box, and comprise the casing of a sealing, it is characterized in that, be provided with disc spring film in described casing, the middle part of described disc spring film is provided with loudspeaker, and the circumference of described loudspeaker is provided with the outstanding limit of vibration.The utility model makes sound pressure level get a promotion; The resonance frequency of audio amplifier is significantly reduced, and accepts the resonance frequency of loud speaker, sound signal of resetting better.Because audio amplifier internal loudspeaker is fixed on disk spring, under the certralizing ability of disk spring, the rocking of loud speaker when solving sound box system work well, plays guaranteeing role to speakers low frequencies linear movement.

Description

A kind of high sensitive miniature loudspeaker box

Technical field

The utility model relates to a kind of audio amplifier, particularly relates to a kind of high sensitive miniature loudspeaker box.

Background technology

The sound pressure level of basic fundamental parameter: 1511SPK is: 85dB (0.1w/0.1m); The resonance frequency of 1511SPK: 500+/-20%Hz; The sound pressure level of 1511box is: 86+/-3dB (0.1w/0.1m); The resonance frequency of 1511box: 850+/-15%Hz.

From above-mentioned parameter, an independent 1511SPK is contained in the sound chamber of the about 1CC of volume, forms one and miniaturely closes case; This case acoustic pressure of closing is low, and the resonance frequency of audio amplifier is high, and in sense of hearing, low frequency does not have dynamics, simultaneously because FO is high, and the sound luminance difference of intermediate-frequency section.After vanning, frequency can not be very true in reduction in the sound signal of below 700Hz, shows very inadequate in the loudness of sound and brightness and resolution.The shortcoming root existed is that the effective radiating area of 1511 monomers itself is little, in simultaneously limited space, the oscillation space of vibrating diaphragm is very little, the compliance limiting vibrating diaphragm can not be too large, otherwise can produce the impact sound that diaphragm encounters protecting cover and magnetic circuit, makes whole sound box system disabler; Simultaneously because the bore of Loudspeaker diaphragm is too little, when it vibrates at every turn, the air capacity of promotion is just little, and amount of bass sense, the volume of air promoted with loudspeaker has direct relation, and like this, the congenital defect of this miniature loudspeaker box just result in the shortage of its bass.

Utility model content

The purpose of this utility model is to provide a kind of high sensitive miniature loudspeaker box, solves the shortcoming that prior art exists.

The utility model adopts following technical scheme to realize:

A kind of high sensitive miniature loudspeaker box, comprise the casing of a sealing, it is characterized in that, be provided with disc spring film in described casing, the middle part of described disc spring film is provided with loudspeaker, and the circumference of described loudspeaker is provided with the outstanding limit of vibration.

Further, described disc spring film has the body of a ring-type, and the edge of body is provided with open slot.

Further, described open slot is uniformly distributed.

Further, the quantity of described open slot is even number.

Advantageous Effects of the present utility model is: sound pressure level gets a promotion; The resonance frequency of audio amplifier is significantly reduced, and accepts the resonance frequency of loud speaker, sound signal of resetting better.Because audio amplifier internal loudspeaker is fixed on disk spring, under the certralizing ability of disk spring, the rocking of loud speaker when solving sound box system work well, plays guaranteeing role to speakers low frequencies linear movement.Have with the equal prioritization scheme being with 1511 high sensitivity miniature loudspeaker boxes of shell fragment and passive vibrating diaphragm to design.

Accompanying drawing explanation

Fig. 1 is the structural representation of high sensitive miniature loudspeaker box.

Fig. 2 is the structural representation of disc spring film.

Embodiment

By below to the description of embodiment; to more contribute to public understanding the utility model; but the restriction that the specific embodiment given by applicant can't be considered as technical solutions of the utility model, any definition to parts or technical characteristic change and/or to overall structure do form and immaterial conversion all should be considered as the protection range that the technical solution of the utility model limits.

From acoustic pressure computing formula: SPL=20log (k*Sd), (in formula, k is design factor)

Known, improve the root of this existing picture, be the effective radiating area Sd increasing audio amplifier, in like manner, calculates formula by the resonance frequency of audio amplifier:

$\mathrm{Fc}=\mathrm{Fo}\sqrt{(1+\mathrm{\α})},\mathrm{\α}\frac{\mathrm{Vc}}{\mathrm{Vas}},\mathrm{Vas}=\mathrm{\ρ}*{C_o}^2*C_{\mathrm{ms}}*{\mathrm{Sd}}^2,\mathrm{fo}=1/\left(2\mathrm{\π}\sqrt{\mathrm{Mms}*\mathrm{Cms}}\right)$

Increase the compliance of audio amplifier.When tank-volumes is constant, only has the equivalent volume increasing loud speaker, could realize.After audio amplifier compliance increases, just can improve height and the dynamics sense of sound during audio amplifier work.The sound signal at 300-Fc place is able to real reduction, and strong with low frequency to hearer, intermediate frequency is beautiful, the impression that high frequency stereovision is abundant.

High sensitive miniature loudspeaker box as depicted in figs. 1 and 2, comprise the casing 1 of a sealing, be provided with disc spring film 3 in casing 1, disc spring film 3 is fixed on bracket 2, the middle part of disc spring film 3 is provided with loudspeaker 4, and the circumference of loudspeaker 4 is provided with the outstanding limit 5 of vibration.Disc spring film 3 has the body of a ring-type, and in the present embodiment, the edge of body is provided with open slot 6.Open slot 6 is uniformly distributed, and the quantity of open slot 6 is even number.The disc spring film 3 of the present embodiment is positioned by bracket 2 in the middle of combinationally using, and the processing depth controlling open slot 6 can control the height of loudspeaker 4, can be adjusted the bearing capacity of product by the type selecting of the width size adjustment engagement brackets 2 of open slot 6.Not only easy for installation, use safety firmly but also well solves the orientation problem of the disc spring film of small space.

Passive vibrating diaphragm and 1511SPK are mounted in the casing of sealing, when loudspeaker work is sounded, the motion of Loudspeaker diaphragm, the air in casing can be caused to be compressed and expand, under the effect of air pressure change, passive vibrating diaphragm produces vibration, promotes the air outside casing, so just can sound.Because passive vibrating diaphragm can design at the front portion of audio amplifier or rear portion, like this, its vibration area often can do larger.Like this, the volume promoting air also increases thereupon, and this just improves the amount sense of bass greatly, and meanwhile, the bore of passive vibrating diaphragm increases, and can also reduce its resonance product frequency, make audio amplifier when sounding, obtain better bass submerged depth.Like this, rely on larger passive vibrating diaphragm, 1511 miniature loudspeaker boxes enough obtain good bass effect.

The sound pressure level of parameter: 1511box after optimizing:

86+20log(20.5*16.5)/(13.5*9.5)＝96.4dB(0.1W/0.1M)

The resonance frequency of 1511box: $\mathrm{Fc}=\mathrm{Fo}*\sqrt{1+{\mathrm{\α}}_2}=500*\sqrt{1+0.1437}=535\mathrm{Hz}$

Test the data drawn to show from above, 1511 high sensitivity miniature loudspeaker boxes of band shell fragment and passive vibrating diaphragm are designed with following good electric sound characteristics:

Sound pressure level gets a promotion;

The resonance frequency of audio amplifier is significantly reduced, and accepts the resonance frequency of loud speaker 1511, sound signal of resetting better;

Because audio amplifier internal loudspeaker is fixed on disk spring, under the certralizing ability of disk spring, the rocking of loud speaker when solving sound box system work well, plays guaranteeing role to speakers low frequencies linear movement;

Have with the equal prioritization scheme being with 1511 high sensitivity miniature loudspeaker boxes of shell fragment and passive vibrating diaphragm to design:

1, when passive vibrating diaphragm is arranged on the back side of loud speaker, the same effect optimized also is had;

2, disc spring film can hang with the vibrating diaphragm that intensity is high limit and general energy centring disk substitute.

1511 high sensitivity miniature loudspeaker boxes of shell fragment and passive vibrating diaphragm design, the shape of passive vibrating diaphragm is crucial, because be arranged between loud speaker and casing, form the parts having support strength can do again sounding vibrating diaphragm, secondly, the centralized positioning effect of disk spring is indispensable, otherwise during sound box system work, loud speaker can produce and rocks, and makes low-frequency distortion become large.Shape-vibrating diaphragm that passive vibrating diaphragm combines with operation principle hangs limit, is the emphasis of the design.Effect is the acoustic pressure promoting micro-shape audio amplifier, reduces the common frequency of micro-shape audio amplifier, the sound signal of better playback low-frequency range.

Certainly; the utility model can also have other various embodiments; when not deviating from the utility model spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the utility model, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the utility model.

Claims (4)

1. a high sensitive miniature loudspeaker box, comprise the casing of a sealing, it is characterized in that, be provided with disc spring film in described casing, the middle part of described disc spring film is provided with loudspeaker, and the circumference of described loudspeaker is provided with the outstanding limit of vibration.

2. high sensitive miniature loudspeaker box according to claim 1, is characterized in that, described disc spring film has the body of a ring-type, and the edge of body is provided with open slot.

3. high sensitive miniature loudspeaker box according to claim 2, is characterized in that, described open slot is uniformly distributed.

4. high sensitive miniature loudspeaker box according to claim 2, is characterized in that, the quantity of described open slot is even number.