CN105491488A - Loudspeaker unit - Google Patents

Abstract

The invention brings forward a loudspeaker unit. The loudspeaker unit comprises a support, a vibrating body, a vibration apparatus and a control portion, wherein the end of the vibrating body is fixed at the inner side of the support, at least one opening is arranged at a position, which is deviated from the center of the vibrating body, in the vibrating body, the vibration apparatus is assembled on the vibrating body, the control portion is used for processing externally input signals and generating driving signals so as to drive the vibration apparatus, and the control portion comprises a processing portion, a DA converter and an amplifier which are successively connected. The loudspeaker unit related to by the invention can generate many minimal vibration modes and can enable frequency features to become relaxed and natural, thereby enabling output timbre to be good.

Description

A kind of loudspeaker unit

Technical field

The present invention relates to electroacoustic field, particularly relate to one and convert electrical signals to physical vibration thus sonorific loudspeaker unit.

Background technology

Loudspeaker unit refers to the electric wave amplitude first increasing recording voice, is then reached vibrating device and causes vibrating body to vibrate, thus produces the device of the sound wave (also can be called sound) in the range of audibility.In loudspeaker unit of the prior art, permanent magnet and voice coil are frequently used as vibrating device.The loud speaker with this spline structure often needs a large amount of parts, therefore trends towards maximizing and heavinessization.

In recent years, along with the use of the small portable terminals such as mobile phone is more and more universal, the miniaturization of loudspeaker unit and lighting also become the demand of people.Therefore, manufacturer starts to adopt piezoelectric element as vibrating device.But due to the minimizing of vibrating body vibration plane, cause final tonequality not good.Also have in prior art and multiple piezoelectric element to be supported with cantilever beam form and by the loudspeaker unit of vibration end and vibrating body side edge, although by such vibrational power flow, can obtain the frequency characteristic that overall sound pressure level is high, do not have sharp-pointed crest, but the structure being supported for cantilever fashion can cause the increase of production cost.

Summary of the invention

In order to overcome problems of the prior art, the present invention proposes the loudspeaker unit of a kind of miniaturization, high tone quality.

To achieve these goals, the present invention proposes a kind of loudspeaker unit, described loudspeaker unit comprises support, vibrating body, vibrating device and control part, the inner side of described support is fixed in the termination of wherein said vibrating body, at least one opening is provided with in the position of departing from its center in described vibrating body, described vibrating device is assemblied on described vibrating body, described control part is used for processing the signal of outside input and generating drive singal, to drive described vibrating device, described control part comprises the handling part, D/A converter and the amplifier that are connected successively.

Preferably, described vibrating device adopts piezoelectric element, at the docking location of the opening with described vibrating body, described vibrating device is also provided with opening.

Preferably, described vibrating body is that axis is divided into impartial some regions with center, in that region, is respectively provided with opening departing from the position that described vibrating body centre distance do not wait.

The beneficial effect of the program of the present invention is that above-mentioned loudspeaker unit can produce many small vibration modes, frequency characteristic can be made to become mitigation nature, therefore, it is possible to make output acoustical sound.

Accompanying drawing explanation

Fig. 1 (A) shows the plan structure schematic diagram of loudspeaker unit involved in the present invention.

Fig. 1 (B) shows the schematic cross-section of loudspeaker unit involved in the present invention.

Fig. 1 (C) shows the vibration mode figure of loudspeaker unit involved in the present invention.

Fig. 1 (D) shows the frequency characteristic figure of loudspeaker unit involved in the present invention.

Fig. 2 shows the functional block diagram of control part involved in the present invention.

Fig. 3 (A) shows the vibration mode figure of conventional loudspeakers unit.

Fig. 3 (B) shows the frequency characteristic figure of conventional loudspeakers unit.

Fig. 4 shows the schematic diagram of the opening of the vibrating body involved by a kind of embodiment of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.

As shown in Figure 1, loudspeaker unit 1 involved in the present invention comprises support 10, vibrating body 20 and vibrating device 30.Its medium-height trestle 10 is the supporting component supporting described vibrating body 20, and it is made up of the material such as metal, resin, forms the cylindrical shape with certain abundant degree.The inner side of support 10 is fixed wtih the termination of vibrating body 20, therefore vibrating body 20 can be support by support 10 and realize vibration, the shape of support 10 is not limited to cylindrical shape, also can adopt prismatic, can adopt the tubular with bottom surface in addition according to the shape of vibrating body 20 or frequency characteristic.

Vibrating body 20 can adopt sheet-like element, is sounded by vibration.It to be made up with the flexible material of appropriateness of metal, resin etc. and rounded.Metal material can adopt the alloy of phosphor bronze, stainless steel, magnesium, aluminium, titanium, beryllium or these materials.Resin material can adopt mephenesin Carbamate system, polypropylene-based, polyethylene-based, polystyrene, polyamide-based etc.Circular open 20a is provided with, the home position of vibrating body 20 described in the position deviation that this circular open 20a is arranged in vibrating body 20.

Vibrating device 30 is the devices triggering vibrating body 20 vibration.In the present embodiment, it is the piezoelectric element of power that described vibrating device 30 adopts voltage transition.Piezoelectric element can be made up of potteries such as lead zirconate titanates (PZT).The diameter of vibrating device 30 is less than the diameter of vibrating body 20, and in circular plate type, its one side is docked with vibrating body 20, is assemblied on vibrating body 20.Also be provided with opening 30a in vibrating device 30, this opening 30a is larger a little than the circular open 20a in vibrating body 20, and is connected with circular open 20a, forms an open slot.

Because loudspeaker unit 1 changes electric signal into physical vibration thus sonorific device, therefore loudspeaker unit 1 also comprises control part 40, and the drive singal that loudspeaker unit 1 is sent by this control part 40 operates.Control part 40 first processes input signal (being digital signal) herein, then generates drive singal, drive singal is sent to vibrating device 30 afterwards again, carry out control loudspeaker unit 1 thus and produce sound.In the present embodiment, control part 40 can adopt microcomputer to realize its function.

Fig. 2 shows the functional block diagram of control part 40 involved in the present invention.Control part 40 is made up of handling part 42, D/A converter 44 and amplifier 46.Wherein handling part 42 is for receiving input signal and processing this signal, input signal is herein digital signal, and the process that described handling part 42 carries out comprises: the Δ Σ modulation, Modulation and Amplitude Modulation (AM modulation), frequency modulation(FM) (FM modulation) etc. of repairing tonequality, the compression minimum and maximum difference of volume (strong and weak method), correction quantization noise.Input signal is after treatment sent to D/A converter 44, and D/A converter 44 changes the signal received from handling part 42 (digital signal) into analog signal.Analog signal afterwards after conversion is sent to amplifier 46.The signal received from D/A converter 44 (analog signal) is increased amplitude by amplifier 46.And the signal after amplification is sent to vibrating device 30 as drive singal.Vibrating device 30 receives drive singal from control part 40 and is driven, and then applies vibration to vibrating body 20.

Be described with regard to the vibration mode of vibrating body 20 and frequency characteristic below.In order to contrast, Fig. 3 (A) and Fig. 3 (B) respectively illustrates vibration mode figure and the frequency characteristic figure of conventional loudspeakers unit.So-called conventional loudspeakers unit, does not arrange circular open 20a in its vibrating body 20.In the present embodiment, what the vibration mode in Fig. 3 (A) showed is the vibration mode about normal line L that Fig. 1 (A) embodies.Because vibrating body 20 is at least being fixed on the end head of support 10 with node, so vibration mode possesses the half-wavelength m1 equal with the datum line L correlation magnitude of vibrating body 20, for the 2 overtones band m2 of m1,3 overtones band m3 ... be occur resonance when the odd multiple number of frequency of m1, when even-multiple frequency, antiresonance occur.Fig. 3 (A) shows m1, and in the frequency characteristic that m2, m3, Fig. 3 (B) show, m1, m3 present the maximum resonance of sound press, and m2 presents the minimum antiresonance of sound press.Therefore, do not arrange the difference of vibrating body 20 along with frequency of circular open 20a, its sound press can significantly change, and therefore causes tonequality inferior.

Fig. 1 (C) and Fig. 1 (D) respectively illustrates vibration mode figure and the frequency characteristic figure of loudspeaker unit 1 involved in the present invention.Because vibrating body 20 is at least being fixed on the end head of support 10 with node, so vibration mode has the half-wavelength m1 equal with the normal line L correlation magnitude of vibrating body 20, resonance, antiresonance in even-multiple frequency in the frequency of m1 odd-multiple, identical with Fig. 3 above.Because vibrating body 20 involved in the present invention has circular open 20a, therefore the end head of vibrating body 20 at least in the termination and circular open 20a of being fixed on support is with node, thus there is half-wavelength m1a, and resonate when m1a odd multiple number of frequency, there is antiresonance when even-multiple frequency.Same, because another end head at least in the termination and circular open 20a of being fixed on support of vibrating body 20 is with node, thus there is half-wavelength m1b, and resonate when m1a odd multiple number of frequency, the antiresonance when even-multiple frequency.Fig. 1 (C) shows m1, m2, m1a, m2a, m1b, m2b.As seen from the figure outside vibration mode m1, m2, also can produce small vibration mode m1a, m2a, m1b, m2b, thus in the frequency characteristic figure shown in Fig. 1 (D), the change of respective frequencies, the small variations that sound press there occurs, make overall frequency characteristic possess the natural variation characteristic of mitigation, therefore make the tonequality of loudspeaker unit excellent.For vibration mode, in fact be not limited to shown in Fig. 1 (C) only in the diametric(al) of vibrating body 20 through circular open 20a, all can there is vibration mode at any direction of the vibrating body 20 through circular open 20a, its frequency characteristic can be infered thus than the nature of mitigation more in Fig. 1 (D).

Circular open 20a is preferably disposed on the home position place departing from vibrating body 20.As described above, arrange circular open 20a in the position of departing from vibrating body 20 center, can produce the vibration mode of different frequency respectively on the right side of vibrating body 20 and left part, therefore frequency characteristic can produce and change minutely, makes the overall mitigation nature become.In addition, circular open 20a is not limited to one, also mostly can arrange, can produce more small vibration mode thus, frequency characteristic be become and more relaxes nature.

Fig. 4 shows the schematic diagram of the opening of the vibrating body involved by a kind of embodiment of the present invention.Overlook described vibrating body 20, it is separated several region at circumferencial direction by equalization.In the present embodiment, 301,302,303 3 regions of division are shown.In these regions depart from vibrating body 20 centre distance not wait position be respectively provided with opening 20a1,20a2,20a3, its split shed 20a1 distance vibrating body 20 center farthest, opening 20a3 distance vibrating body 20 center nearest.Thus, can produce multiple basic vibration mode, frequency characteristic also can become more soft slow.

Although the vibrating body 20 in the present embodiment is made into circle, be not limited to circle in a practical situation, also can use the arbitrary shape such as rectangle, ellipse.And circular open 20a also can make arbitrary shape, size and quantity according to the frequency characteristic wanting to obtain.Vibrating device 30 also can use the element consisted of the permanent magnet of vibrating body applying vibration and coil electromagnetic force.

Loudspeaker unit involved in the present invention has the advantage of miniaturization, high tone quality, is particularly suitable in smart mobile phone, notebook computer, panel computer, PDA(Personal Digital Assistant), game central control board, digital camera etc., particularly Miniature Terminal.

Claims (3)

1. a loudspeaker unit, it is characterized in that: described loudspeaker unit comprises support, vibrating body, vibrating device and control part, the inner side of described support is fixed in the termination of wherein said vibrating body, at least one opening is provided with in the position of departing from its center in described vibrating body, described vibrating device is assemblied on described vibrating body, described control part is used for processing the signal of outside input and generating drive singal, to drive described vibrating device, described control part comprises the handling part, D/A converter and the amplifier that are connected successively.

2. loudspeaker unit according to claim 1, is characterized in that: described vibrating device adopts piezoelectric element, at the docking location of the opening with described vibrating body, described vibrating device is also provided with opening.

3. loudspeaker unit according to claim 1, is characterized in that: described vibrating body is that axis is divided into impartial some regions with center, in that region, is respectively provided with opening departing from the position that described vibrating body centre distance do not wait.