CN116567503A

CN116567503A - Telephone receiver and electronic equipment

Info

Publication number: CN116567503A
Application number: CN202310582621.4A
Authority: CN
Inventors: 孙伟; 闫鑫; 岳德刚
Original assignee: Huaqin Technology Co Ltd
Current assignee: Huaqin Technology Co Ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2023-08-08

Abstract

The invention provides a receiver and electronic equipment, the receiver comprises a shell, a vibrating diaphragm assembly, a magnetic circuit assembly and a piezoelectric sheet, the shell is provided with a hollow cavity, the vibrating diaphragm assembly comprises a vibrating diaphragm and a vibrating body, the vibrating diaphragm divides the hollow cavity into a first cavity and a second cavity, the vibrating body comprises a fixed part and a free part, the end part of the free part is connected with the vibrating diaphragm, the fixed part is fixed on the shell, the magnetic circuit assembly comprises a coil sleeved on the vibrating body and at least one first magnet arranged on either side of the free part, the electromagnetic field generated after the coil is electrified and the fixed magnetic field of the first magnet drive the free part to vibrate so that the free part drives the vibrating diaphragm to vibrate, the piezoelectric sheet is attached to the free part, and the piezoelectric sheet is contracted or stretched after the piezoelectric sheet is electrified so that the end part of the free part generates displacement so that the free part drives the vibrating diaphragm to reciprocate in the vibrating direction of the vibrating diaphragm.

Description

Telephone receiver and electronic equipment

Technical Field

The invention belongs to the technical field of receivers, and particularly relates to a receiver and electronic equipment.

Background

The balanced armature receiver (Balanced Armature Receiver, BAR for short) has the advantages of small volume, light weight, high sensitivity, high transient response and the like, and is widely applied to products such as hearing aids, high-end TWS (time varying signal) earphones and the like.

The frequency response curve of the prior art BAR begins to drop after 9kHz and after 10kHz a number of peaks and valleys of the frequency response rise and fall, affecting the consumer's perception during use.

Disclosure of Invention

The invention aims to provide a telephone receiver and electronic equipment, which are used for solving the problem that the high-frequency response effect of a balanced armature telephone receiver in the prior art is not ideal.

In order to achieve the above purpose, the invention adopts the following technical scheme: the first aspect of the invention provides a receiver, which comprises a shell, a vibrating diaphragm assembly, a magnetic circuit assembly and a piezoelectric sheet;

the shell is provided with a hollow cavity, the vibrating diaphragm assembly comprises a vibrating diaphragm and a vibrating body, the vibrating diaphragm divides the hollow cavity into a first cavity and a second cavity, the vibrating body, the magnetic circuit assembly and the piezoelectric sheet are all positioned in the second cavity, the vibrating body comprises a fixed part and a free part, the end part of the free part is connected with the vibrating diaphragm, and the fixed part is fixed on the shell; the magnetic circuit assembly comprises a coil sleeved on the vibrating body and at least one first magnet arranged on any side of the free part; the electromagnetic field generated after the coil is electrified and the fixed magnetic field of the first magnet drive the free part to vibrate, so that the free part drives the vibrating diaphragm to vibrate; the piezoelectric sheet is attached to the free portion, and contracts or stretches after being electrified, so that the end portion of the free portion is displaced, and the free portion drives the vibrating diaphragm to reciprocate in the vibrating direction of the vibrating diaphragm.

In an embodiment, the vibration body is an armature, the armature is in a U shape, the armature comprises a first flat plate and a second flat plate which are parallel to each other, the fixed part is located on the first flat plate, and the free part is located on the second flat plate.

In an embodiment, the piezoelectric sheet is attached to an upper side of the second plate or the piezoelectric sheet is attached to a lower side of the second plate.

In an embodiment, the piezoelectric sheets include a first piezoelectric sheet and a second piezoelectric sheet, the first piezoelectric sheet is attached to an upper side of the second flat plate, the second piezoelectric sheet is attached to a lower side of the second flat plate, and projections of the first piezoelectric sheet and the second piezoelectric sheet on the second flat plate overlap.

In an embodiment, the piezoelectric device further comprises a circuit board, wherein the circuit board is arranged on the outer side of the hollow cavity and fixed on the shell, a coil wiring pad and a piezoelectric patch wiring pad are arranged on the circuit board, the coil wiring pad is used for being electrically connected with the coil, and the piezoelectric patch wiring pad is used for being electrically connected with the piezoelectric patch.

In one embodiment, the thickness of the piezoelectric sheet is greater than or equal to 0.05mm and less than or equal to 0.30mm.

In an embodiment, the magnetic circuit assembly further includes a magnetic ring, the magnetic ring is disposed in the second cavity, the magnetic ring is fixed on the housing, the fixing portion is fixed on an outer ring of the magnetic ring, and the first magnet is fixed on an inner ring of the magnetic ring.

In an embodiment, the magnetic circuit assembly further comprises a second magnet for providing a fixed magnetic field; the second magnet and the first magnet are oppositely arranged and are respectively positioned at two sides of the vibrating body; and the polarities of the opposite ends of the second magnet and the first magnet are opposite, and a vibration gap of the free part is reserved between the second magnet and the first magnet and between the second magnet and the vibration body respectively.

In an embodiment, the coil is sleeved on the free portion of the vibrator, a preset gap is formed between the coil and the free portion, and the periphery of the coil is fixed on the inner wall of the shell.

In an embodiment, the housing includes a first shell having an opening and a second shell having an opening, the opening of the first shell and the opening of the second shell are buckled to form the hollow cavity, the diaphragm is fixed between the opening of the first shell and the opening of the second shell, and the second shell is provided with a slot for the coil and the electrical connection wire of the piezoelectric sheet to pass through.

A second aspect of the invention provides an electronic device comprising a receiver as described above.

The invention provides a telephone receiver which comprises a shell, a vibrating diaphragm assembly, a magnetic circuit assembly and a piezoelectric sheet, wherein the shell is provided with a hollow cavity, the vibrating diaphragm assembly comprises a vibrating diaphragm and a vibrating body, the hollow cavity is divided into a first cavity and a second cavity by the vibrating diaphragm, the vibrating body, the magnetic circuit assembly and the piezoelectric sheet are all positioned in the second cavity, the vibrating body comprises a fixed part and a free part, the end part of the free part is connected with the vibrating diaphragm, the fixed part is fixed on the shell, the magnetic circuit assembly comprises a coil sleeved on the vibrating body and at least one first magnet arranged on any side of the free part, the electromagnetic field generated after the coil is electrified and the fixed magnetic field of the first magnet are used for driving the free part to vibrate, the free part drives the vibrating diaphragm to vibrate, the piezoelectric sheet is attached to the free part to shrink or stretch after the piezoelectric sheet is electrified, the free part generates displacement to drive the vibrating diaphragm to reciprocate in the vibrating direction of the vibrating diaphragm, the first magnet of the telephone receiver has a static fixed magnetic field, the electromagnetic field generated after the coil is electrified is driven to vibrate with the fixed magnetic field of the first magnet, and the free part is driven to vibrate under the action of the vibration of the free part, and the vibration of the vibrating diaphragm is driven to vibrate in the vibrating direction after the free part is excited to vibrate, and the vibration of the vibrating diaphragm is driven to vibrate, and the vibration of the vibration sheet is driven to vibrate is high.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional structure of a receiver according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a receiver at an angle according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of a receiver at another angle according to an embodiment of the present invention;

fig. 4 is a schematic partial structure of a second housing of the receiver according to the embodiment of the present invention;

fig. 5 is a schematic structural view of a piezoelectric sheet attached to a vibrator of a receiver according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a coil connection pad and a piezoelectric patch connection pad according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a vibrator of a receiver to which two piezoelectric sheets are attached according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a coil and a coil connection pad, and a polarity connection structure between a piezoelectric plate and a piezoelectric plate connection pad, in which a piezoelectric plate is attached to a vibrator according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a coil and coil connection pad, and a piezoelectric patch and piezoelectric patch connection pad polarity connection structure of a vibrator attached with two piezoelectric patches according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a coil and a coil connection pad, and a piezoelectric patch connection pad polarity connection structure of a vibrator attached with two piezoelectric patches according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a deformation structure of a vibrator attached with a piezoelectric sheet according to an embodiment of the present invention when the piezoelectric sheet is not energized;

fig. 12 is a schematic diagram of a deformation structure of a vibrator attached with two piezoelectric sheets according to an embodiment of the present invention when the piezoelectric sheets are not energized;

FIG. 13 is a simplified schematic diagram of a receiver with a piezoelectric patch attached thereto according to an embodiment of the present invention;

fig. 14 is a schematic diagram of a simplified simulated structure of a receiver attached with two piezoelectric sheets according to an embodiment of the present invention;

FIG. 15 is a schematic diagram showing the result of the displacement simulation of a diaphragm of a receiver attached with a piezoelectric sheet according to an embodiment of the present invention;

fig. 16 is a schematic diagram showing a result of simulation of displacement of a diaphragm of a receiver attached with two piezoelectric sheets according to an embodiment of the present invention;

FIG. 17 is a diagram showing the comparison of the results of the simulation of the displacement of the vibrating diaphragm of a receiver attached with a piezoelectric sheet and a receiver attached with two piezoelectric sheets according to an embodiment of the present invention;

FIG. 18 is a schematic diagram showing the results of simulation comparison of the displacement of driving diaphragms of different thickness vibrators according to an embodiment of the present invention;

fig. 19 is a schematic diagram showing a comparison result of displacement simulation of piezoelectric sheet driving diaphragms with different thicknesses according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.

In addition, in the present application, unless explicitly stated and limited otherwise, the terms "connected," "secured," "mounted," and the like are to be construed broadly, and may be, for example, mechanically or electrically; either directly, or indirectly through intermediaries, or in communication with each other, or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms in this application will be understood to those of ordinary skill in the art.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.

The balanced armature receiver has the advantages of small volume, light weight, high sensitivity, high transient response and the like, and is widely applied to products such as hearing aids, high-end TWS (time varying signal) earphones and the like. The inventor finds that the frequency response curve of the balanced armature receiver in the prior art starts to fall after 9kHz and a plurality of frequency response peaks and valleys are fluctuated after 10kHz, and the invention improves the frequency response of the full frequency band of the existing balanced armature receiver, in particular to the high frequency response caused by the driving of a piezoelectric plate.

The receiver and the electronic device provided by the invention are described in detail below with reference to specific embodiments.

Fig. 1 is a schematic cross-sectional structure of a receiver according to an embodiment of the present invention, fig. 2 is a schematic perspective view of the receiver according to an embodiment of the present invention at one angle, fig. 3 is a schematic perspective view of the receiver according to an embodiment of the present invention at another angle, fig. 4 is a schematic partial structure of a second housing of the receiver according to an embodiment of the present invention, and referring to fig. 1-4, a first aspect of the embodiment of the present invention provides a receiver, which includes a housing 1, a diaphragm assembly 2, a magnetic circuit assembly 3, and a piezoelectric sheet 4.

The casing 1 is provided with a hollow cavity, the vibrating diaphragm assembly 2 comprises a vibrating diaphragm 21 and a vibrating body 22, the vibrating diaphragm 21 divides the hollow cavity into a first cavity and a second cavity, the vibrating body 22, the magnetic circuit assembly 3 and the piezoelectric sheet 4 are all positioned in the second cavity, the vibrating body 22 comprises a fixed part 221 and a free part 222, the end part of the free part 222 is connected with the vibrating diaphragm 21, and the fixed part 221 is fixed on the casing 1; the magnetic circuit assembly 3 comprises a coil 31 sleeved on the vibrating body 22 and at least one first magnet 32 arranged on either side of the free part 222; the electromagnetic field generated after the coil 31 is electrified and the fixed magnetic field of the first magnet 32 drive the free portion 222 to vibrate, so that the free portion 222 drives the vibrating diaphragm 21 to vibrate; the piezoelectric sheet 4 is attached to the free portion 222, and the piezoelectric sheet 4 contracts or expands after being electrified, so that the end portion of the free portion 222 generates displacement, and the free portion 222 drives the diaphragm 21 to reciprocate in the vibration direction of the diaphragm 21.

The receiver of the present embodiment may be applied to an earphone core or a hearing aid, and the size of the housing is not particularly limited in the present embodiment. The casing 1 of the embodiment supports and protects the diaphragm assembly 2 and the magnetic circuit assembly 3.

Illustratively, the housing 1 includes a first casing 11 having an opening and a second casing 12 having an opening, the opening of the first casing 11 and the opening of the second casing 12 are fastened to form the hollow cavity, the diaphragm 21 is fixed between the opening of the first casing 11 and the opening of the second casing 12, the second casing 12 has a slot 13, and the slot 13 is used for passing through the coil 31 and the electrical connection wire of the piezoelectric sheet 4. The vibrating diaphragm 21 and the first housing 11 of this embodiment are sealed to form a first cavity, the first cavity is communicated with the outside through a sound emitting channel arranged on the first housing 11, the vibrating diaphragm 21 and the second housing 12 of this embodiment are sealed and fixed to form a second cavity, the vibrating body 22, the magnetic circuit assembly 3 and the piezoelectric sheet 4 are all located in the second cavity, the remaining space in the second cavity which is not occupied by other components has an effect of adjusting the acoustic frequency response characteristic of the receiver itself, and the second housing 12 of this embodiment is provided with a leakage hole 14 to adjust the receiver performance, for example, the leakage hole 14 is used for adjusting the low-frequency response characteristic of the earphone core and balancing the internal and external air pressures of the receiver.

The magnetic circuit assembly 3 of the present embodiment further includes a magnetic ring 33, the magnetic ring 33 is fixed on the housing 1, the fixing portion 221 is fixed on an outer ring of the magnetic ring 33, and the first magnet 32 is fixed on an inner ring of the magnetic ring 33.

The magnetic circuit assembly 3 of the present embodiment further comprises a second magnet 34 for providing a fixed magnetic field; the second magnet 34 and the first magnet 32 are disposed opposite to each other and are located on both sides of the vibrator 22, respectively; the second magnet 34 and the first magnet 32 face each other with opposite polarities at their ends, and have a vibration gap with the free portion 222 reserved between them and the vibrator 22, respectively. The first magnet 32 and the second magnet 34 are arranged in the embodiment, so that the fixed magnetic field strength in the hollow cavity of the receiver can be enhanced.

Further, the coil 31 is sleeved on the free portion 222 of the vibrator 22, a preset gap is provided between the coil 31 and the free portion 222, and the periphery of the coil 31 is fixed on the inner wall of the housing 1. The preset gap between the coil 31 and the free portion 222 of the present embodiment is larger than the free portion 222 of the vibrator 22. The outer periphery of the coil 31 is fixed to the inner wall of the housing 1, and the coil 31 is firmly fixed.

The vibrating body 22 in this embodiment is an armature, and the armature includes a first flat plate, a second flat plate, and a connecting plate for connecting the first flat plate and the second flat plate, where the first flat plate, the second flat plate, and the connecting plate are in an integrated structure, the fixing portion 221 is located on the first flat plate, and the free portion 222 is located on the second flat plate. The first plate of this embodiment is fixed on the magnetic conductive ring 33, and the connection portion and the second plate are in a suspended state. The second plate end of the embodiment is provided with a drive rod 23 connected to the diaphragm 21. The vibrator 22 of this embodiment is a rectangular sheet formed by bending twice at 90 degrees continuously, and the manufacturing method is simple and quick.

The vibrating diaphragm assembly and the magnetic circuit assembly of the receiver in the above embodiment have the following working principles: when the coil 31 is energized, the coil 31 polarizes the vibrator 22, the free portion 222 of the edge of the polarized vibrator 22 is placed in the static magnetic field formed by the first magnet 32 and the magnetic conductive ring 33, the static magnetic field attracts and repels the polarized vibrator 22, the attraction and repulsion deform the edge of the vibrator 22, and the deformation is transmitted to the diaphragm 21 by the driving rod 23 placed on the edge of the vibrator 22, so that the diaphragm 21 is deformed. The acoustic signal, which typically varies in real time, is input to the coil 31 in the form of an alternating current. The alternating current can change the polarity and the polarization intensity of the vibrating body 22 at different moments, so that the magnetic force of the magnetic field generated by the first magnet 32 on the vibrating body 22 changes at different moments, the alternating magnetic force enables the vibrating body 22 to generate reciprocating vibration, the vibration effect is transmitted to the vibrating diaphragm 21 through the driving rod 23, the vibrating diaphragm 21 generates vibration, the vibrating diaphragm 21 pushes air near the vibrating diaphragm 21 to generate sound waves, and the sound waves are transmitted through the sound-emitting channel.

Fig. 5 is a schematic structural view of a piezoelectric patch attached to a vibrator of a receiver according to an embodiment of the present invention, fig. 6 is a schematic structural view of a coil connection pad and a piezoelectric patch connection pad provided by an embodiment of the present invention, fig. 7 is a schematic structural view of two piezoelectric patches attached to a vibrator of a receiver according to an embodiment of the present invention, fig. 8 is a schematic structural view of a coil connection pad, a piezoelectric patch and a piezoelectric patch connection pad polarity connection structure of a piezoelectric patch attached to a vibrator according to an embodiment of the present invention, fig. 9 is a schematic structural view of a coil connection pad, a piezoelectric patch and a piezoelectric patch connection pad polarity connection structure of a piezoelectric patch attached to a coil, a piezoelectric patch and a piezoelectric patch provided by an embodiment of the present invention, fig. 10 is a schematic structural view of a vibrator attached to a piezoelectric patch provided by an embodiment of the present invention when a piezoelectric patch is not energized, and fig. 12 is a deformed structure of a vibrator attached to a piezoelectric patch provided by an embodiment of the present invention when a piezoelectric patch is not energized.

In one embodiment, referring to fig. 5, the piezoelectric sheet 4 is attached to the upper side of the second plate or the piezoelectric sheet 4 is attached to the lower side of the second plate. The piezoelectric sheet 4 is attached to the upper side or the lower side of the free portion of the receiver of the present embodiment, that is, only one piezoelectric sheet 4 of the present embodiment.

In an embodiment, as shown in fig. 7, the piezoelectric sheet 4 is disposed on the upper side of the second plate and the lower side of the second plate, and the projection of the piezoelectric sheet 4 attached to the upper side of the second plate overlaps with the projection of the piezoelectric sheet 4 attached to the lower side of the second plate. The piezoelectric sheets 4 of the present embodiment are two in number, and are attached to the upper side and the lower side of the second flat plate, respectively.

Illustratively, the thickness of the piezoelectric sheet 4 is 0.05mm or more and 0.30mm or less. For example, the piezoelectric sheet 4 has a thickness of 0.05mm,0.1mm,0.15mm,0.2mm,0.25mm.

Referring to fig. 1, 3 and 6, in the above embodiment, the receiver further includes a circuit board 5, the circuit board 5 is disposed on the outer side of the hollow cavity and is fixed on the housing 1, a coil wiring pad 51 and a piezoelectric patch wiring pad 52 are disposed on the circuit board 5, the coil wiring pad 51 is used for electrically connecting with the coil 31, and the piezoelectric patch wiring pad 52 is used for electrically connecting with the piezoelectric patch 4. The circuit board 5 of the present embodiment is fixed to the housing 1,

fig. 6 is a schematic structural diagram of a coil wiring pad and a piezoelectric patch wiring pad provided in an embodiment of the present invention, where four pads are provided, two pads on two sides of the four pads are coil wiring pads 51 for bonding outgoing lines of the coil 31, two pads in the middle are piezoelectric patch wiring pads 52, and the outgoing lines are simply connected from the coil 31 or the piezoelectric patch 4 to the pads.

Referring to fig. 8, when a single piezoelectric sheet 4 is used, that is, the piezoelectric sheet 4 is attached only to the upper side or the lower side of the second flat plate of the vibrator 22, the positive and negative electrodes of the piezoelectric sheet 4 are led out and welded to the positive and negative electrodes of the piezoelectric sheet wiring pad 52, respectively. Referring to fig. 7 and 9, when two piezoelectric plates 4 are used, that is, the piezoelectric plates 4 are attached to the upper side and the lower side of the second flat plate of the vibrator 22 at the same time, the polarities of the outgoing lines of the piezoelectric plates 4 on the upper side of the second flat plate and the outgoing lines of the piezoelectric plates 4 on the lower side of the second flat plate are opposite, for example, the positive electrode and the negative electrode of the piezoelectric plate 4 on the upper side of the second flat plate are welded to the positive electrode and the negative electrode of the piezoelectric plate wiring pad 52 respectively, and at this time, the positive electrode and the negative electrode of the piezoelectric plate 4 on the negative electrode and the positive electrode of the piezoelectric plate wiring pad 52 are welded reversely. Alternatively, as shown in fig. 10, three pairs of bonding pads are disposed on the circuit board 5, one pair is a coil bonding pad 51, and the remaining two pairs are piezoelectric patch bonding pads 52, corresponding to the lead wires of the two piezoelectric patches 4, respectively. In fig. 9, two piezoelectric sheets 4 are powered in parallel, and in fig. 10, two piezoelectric sheets 4 are powered separately.

Description of the operation principle of the piezoelectric sheet 4 in the above embodiment: referring to fig. 1, 5 and 11, when the piezoelectric sheet 4 is one piece, when the piezoelectric sheet 4 is energized, the piezoelectric sheet 4 will generate stretching and shrinking effects in the horizontal direction in fig. 1, the piezoelectric sheet 4 is disposed on the vibrator 22, the stretching and shrinking piezoelectric sheet will drive the vibrator 22 to deform, and the deformed vibrator 22 will cause the edge driving rod 23 of the vibrator 22 to displace. Specifically, when 1 piezoelectric plate is laid on the upper side of the second plate of the vibrator 22, and the piezoelectric plate 4 contracts, the piezoelectric plate 4 drives the second plate of the vibrator 22 to sink downward, and the edge of the second plate of the vibrator 22 is displaced upward; when the piezoelectric sheet 4 stretches, the piezoelectric sheet will drive the second plate of the vibrator 22 to bulge upward and displace the second plate edge of the vibrator 22 downward. When one piezoelectric sheet 4 is laid on the lower side of the second flat plate of the vibrator 22, the contracted piezoelectric sheet 4 will cause the second flat plate edge of the vibrator 22 to bulge upward; the stretched piezoelectric sheet 4 will recess the second flat edge of the vibrator 22 downward, with the effect being opposite to the piezoelectric sheet 4 being laid on the second flat upper side of the vibrator 22. When the piezoelectric sheet 4 is connected with a music signal, the phase and the amplitude of the signal at different moments change in real time. The alternating electric signal causes the piezoelectric sheet 4 to deform by stretching and contracting, and causes the second plate edge of the vibrator 22 to deform by protruding and recessing, and further causes the second plate edge of the vibrator 22 to displace downward and upward. The displacement of the second plate edge of the vibrator 22, which changes in real time, drives the diaphragm 21 to generate vibration displacement through the driving rod 23, and the vibrating diaphragm 21 pushes air near the diaphragm 21 to generate sound waves and radiate outwards.

Referring to fig. 1, 7 and 12, when the number of piezoelectric sheets 4 is two, the piezoelectric sheets 4 are respectively attached to the upper and lower sides of the second plate of the vibrator 22, and the two piezoelectric sheets 4 are respectively deformed by respectively energizing the two piezoelectric sheets 4, so that the stretching effects of the two piezoelectric sheets 4 at the same time are opposite, for example, when the piezoelectric sheet 4 on the upper side of the second plate of the vibrator 22 stretches, the piezoelectric sheet 4 on the lower side of the second plate of the vibrator 22 contracts, at this time the second plate of the vibrator 22 protrudes upward, and the second plate of the vibrator 22 moves downward near the edge of the driving rod 23. The piezoelectric sheets 4 are laid on both the upper and lower sides of the second flat plate of the vibrator 22, and the deformation displacement amount of the vibrator 22 is increased by attaching the piezoelectric sheets 4 on both sides of the second flat plate of the vibrator 22 as compared with the case where the piezoelectric sheets 4 are laid on only one side of the second flat plate of the vibrator 22.

In this embodiment, the coil 31 and the piezoelectric sheet 4 are respectively powered by independent power amplification, and the relative phase adjustment of the independent power amplification signals is needed to ensure that the deformation direction of the vibration body 22 driven by the coil 31 is consistent with the deformation direction of the vibration body 22 driven by the piezoelectric sheet 4, so that the amplitude effects of the two driving modes can be overlapped. The phase of the input coil 31 and the direction in which the coil 31 drives the vibrating body 22 to deform are determined by the winding direction and magnetizing direction of the coil 31, and in a preferred case, when current flows from the positive electrode of the coil wiring pad 51 at a certain moment, the vibrating body 22 pushes the vibrating diaphragm 21 upwards to deform upwards; the phase of the input piezoelectric plate 4 is related to the polarization direction of the piezoelectric plate 4, and a preferable power supply condition of the piezoelectric plate 4 is that the two piezoelectric plates 4 are in an anti-phase parallel structure, when current flows from the negative electrode of the piezoelectric plate wiring pad 52 at a certain moment, the piezoelectric plate 4 positioned on the upper side contracts, the piezoelectric plate 4 positioned on the lower side stretches, and the vibrating body 22 pushes the vibrating diaphragm 21 upwards to deform. The independent power amplifier needs to flow current from the positive electrode of the coil wiring pad 51 at a certain time and at the same time from the negative electrode of the piezoelectric patch wiring pad 52. The design of different products is different, the phase of the current flowing into the coil wiring pad 51 and the piezoelectric patch wiring pad 52 at a certain moment is possibly the same or different according to the design, and the beneficial effect of amplitude superposition can be ensured as long as the coil 31 drives the vibration body 22 and the piezoelectric patch 4 drives the deformation direction generated by the vibration body 22 to be the same.

Fig. 13 is a simplified structure diagram of a receiver with a piezoelectric plate attached thereto according to an embodiment of the present invention, fig. 14 is a simplified structure diagram of a receiver with two piezoelectric plates attached thereto according to an embodiment of the present invention, please refer to fig. 13 and 14, wherein the U-shaped vibrator 21 is simplified to be a straight line type, one side of the straight line type vibrator 21 is fixed, the other side is suspended, and the components such as a housing are removed, so that only the diaphragm 21, the coil 31, the first magnet 32 and the driving rod 13 are reserved, wherein one piezoelectric plate is attached to the vibrator 22 in fig. 13, and two piezoelectric plates are attached to the vibrator 22 in fig. 14. Fig. 15 is a schematic diagram of a simulation result of the displacement of the vibrating diaphragm of the receiver attached with one piezoelectric sheet according to the embodiment of the present invention, and fig. 16 is a schematic diagram of a simulation result of the displacement of the vibrating diaphragm of the receiver attached with two piezoelectric sheets according to the embodiment of the present invention, wherein the size of the vibrator 22 is 6mm by 1.5mm by 0.15mm, the young modulus of the vibrator 22 is 115e9Pa, the density is 7800kg/m 3, and the poisson ratio is 0.3. The electromagnetic force evaluated by simulation was 1e-3N in the vicinity of the driving lever 23. In the simulation evaluation process, the piezoelectric plate 4 selected in this embodiment is PZT-4, the size is 2mm 1.5mm 0.1mm, and the polarization voltage is 50Vrms. Wherein Fmag: representing the electromagnetic drive only case, fpzt: representing the driving condition of the piezoelectric sheet, fag+Fpzt: represents the case of electromagnetic driving and piezoelectric sheet driving simultaneously, zdp: representing the displacement of the area near the drive rod. By comparing the displacement responses of different frequency bands, the acoustic energy output of the receiver at the different frequency bands is predicted, the acoustic sensitivity is related to the displacement of the diaphragm 21, and the displacement of the diaphragm 21 is related to the displacement of the vibrator 22 in the area near the driving rod 23. Based on the simulation results obtained by the simulation modeling parameters, the receiver is larger in displacement within 5kHz when a piezoelectric sheet 4 is attached to the vibrator 22, and the displacement is reduced when the frequency is larger than 5 kHz; when only one piezoelectric sheet 4 is driven, the displacement output is higher at the frequency band higher than 10 kHz. The receiver attached with a piezoelectric sheet 4 can obtain a high displacement output in a frequency band higher than 10 kHz.

When two piezoelectric sheets 4 are attached to the vibrator 22, the conventional balanced armature receiver is larger in displacement within 5kHz, and when the frequency is larger than 5kHz and the displacement is reduced, the receiver can obtain higher displacement output in a frequency band higher than 10 kHz.

Fig. 17 is a schematic diagram showing the result of simulation of the displacement of the vibrating diaphragm of the receiver attached with one piezoelectric sheet and the receiver attached with two piezoelectric sheets according to the embodiment of the present invention, and referring to fig. 17, the displacement driven by the integrated balanced armature of two piezoelectric sheets 4 is slightly higher than the displacement driven by the integrated balanced armature of one piezoelectric sheet 4 in the full frequency band.

Fig. 18 is a schematic diagram showing simulation results of displacement comparison of driving diaphragms driven by driving bodies with different thicknesses according to an embodiment of the present invention, and fig. 18 is a simulation diagram showing displacement of the diaphragms 21 when the thicknesses of the diaphragms 22 are respectively changed to 0.05mm,0.1mm,0.15mm,0.2mm, and 0.25mm under the condition of one piezoelectric driving, wherein the thinner the thickness of the diaphragms 22 is, the higher the sensitivity response is, and the peak value in the displacement characteristic moves toward low frequency as shown in fig. 18.

Fig. 19 is a schematic diagram showing a comparison result of displacement simulation of piezoelectric sheet driving diaphragms with different thicknesses according to an embodiment of the present invention. Fig. 19 is a graph showing the displacement simulation of the diaphragm 21 when the thickness of the piezoelectric plate 4 is 0.05mm,0.1mm,0.15mm,0.2mm, and 0.25mm, respectively, while keeping other parameters unchanged, and it is apparent from fig. 19 that the thinner the piezoelectric plate 4 is, the higher the sensitivity response is, and the peak value in the displacement characteristic remains substantially unchanged.

The telephone receiver comprises a shell, a vibrating diaphragm assembly, a magnetic circuit assembly and a piezoelectric sheet, wherein the shell is provided with a hollow cavity, the vibrating diaphragm assembly comprises a vibrating diaphragm and a vibrating body, the hollow cavity is divided into a first cavity and a second cavity by the vibrating diaphragm, the vibrating body, the magnetic circuit assembly and the piezoelectric sheet are all positioned in the second cavity, the vibrating body comprises a fixed part and a free part, the end part of the free part is connected with the vibrating diaphragm, the fixed part is fixed on the shell, the magnetic circuit assembly comprises a coil sleeved on the vibrating body and at least one first magnet arranged on any side of the free part, the electromagnetic field generated after the coil is electrified and the fixed magnetic field of the first magnet are used for driving the free part to vibrate, the piezoelectric sheet is attached to the free part, the piezoelectric sheet contracts or stretches after the piezoelectric sheet is electrified, the end part of the free part generates displacement to enable the vibrating diaphragm to drive the vibrating diaphragm to reciprocate in the vibrating direction, the electromagnetic field generated after the coil is electrified and the fixed magnetic field of the first magnet are connected with the vibrating diaphragm, the free part is driven to vibrate, and meanwhile the free part is driven to drive the vibrating diaphragm to vibrate under the action of the fixed magnetic field of the first magnet, and the piezoelectric sheet is arranged on the free part after the piezoelectric sheet is electrified to vibrate, and the vibrating diaphragm is driven to vibrate in the vibrating direction to vibrate, and the vibrating part is driven to vibrate freely.

A second aspect of an embodiment of the invention provides an electronic device comprising a receiver as described above. For example: the receiver comprises a shell, a vibrating diaphragm assembly, a magnetic circuit assembly and a piezoelectric sheet;

The electronic device of the embodiment can be a hearing aid or a TWS earphone and other products, the receiver can improve the amplitude of medium and high frequency response, the frequency response characteristics of the hearing aid or the TWS earphone and other products in the medium and high frequency can be greatly improved, and the feeling of consumers in the use process can be improved.

The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. A receiver, characterized in that:

comprises a shell, a vibrating diaphragm assembly, a magnetic circuit assembly and a piezoelectric sheet;

2. The receiver according to claim 1, wherein: the vibrating body is an armature, the armature is U-shaped, the armature comprises a first flat plate and a second flat plate which are parallel to each other, the fixed part is positioned on the first flat plate, and the free part is positioned on the second flat plate.

3. A receiver as claimed in claim 2, characterized in that: the piezoelectric sheet is attached to the upper side of the second flat plate or the piezoelectric sheet is attached to the lower side of the second flat plate.

4. A receiver as claimed in claim 2, characterized in that: the upper side of the second flat plate and the lower side of the second flat plate are respectively provided with the piezoelectric sheets, and the piezoelectric sheets attached to the upper side of the second flat plate are overlapped with the projections of the piezoelectric sheets attached to the lower side of the second flat plate.

5. The receiver as claimed in claim 4, wherein: the piezoelectric sheet attached to the upper side of the second flat plate and the piezoelectric sheet attached to the lower side of the second flat plate are connected in reverse parallel in polarity to supply power, or the piezoelectric sheet attached to the upper side of the second flat plate and the piezoelectric sheet attached to the lower side of the second flat plate are independently powered.

6. A receiver as claimed in any one of claims 1 to 5, characterized in that: the piezoelectric ceramic capacitor also comprises a circuit board, wherein the circuit board is arranged on the outer side of the hollow cavity and fixed on the shell, a coil wiring pad and a piezoelectric patch wiring pad are arranged on the circuit board, the coil wiring pad is used for being electrically connected with the coil, and the piezoelectric patch wiring pad is used for being electrically connected with the piezoelectric patch.

7. The receiver as claimed in claim 6, wherein: the thickness of the piezoelectric sheet is more than or equal to 0.05mm and less than or equal to 0.30mm.

8. The receiver as claimed in claim 6, wherein: the magnetic circuit assembly further comprises a magnetic ring, the magnetic ring is arranged in the second cavity, the magnetic ring is fixed on the shell, the fixing part is fixed on the outer ring of the magnetic ring, and the first magnet is fixed on the inner ring of the magnetic ring.

9. The receiver as claimed in claim 6, wherein: the magnetic circuit assembly further comprises a second magnet for providing a fixed magnetic field; the second magnet and the first magnet are oppositely arranged and are respectively positioned at two sides of the vibrating body; and the polarities of the opposite ends of the second magnet and the first magnet are opposite, and a vibration gap of the free part is reserved between the second magnet and the first magnet and between the second magnet and the vibration body respectively.

10. The receiver as claimed in claim 6, wherein: the coil is sleeved on the free part of the vibrator, a preset gap is reserved between the coil and the free part, and the periphery of the coil is fixed on the inner wall of the shell.

11. The receiver as claimed in claim 6, wherein: the shell comprises a first shell with an opening and a second shell with an opening, the opening of the first shell and the opening of the second shell are buckled to form the hollow cavity, the vibrating diaphragm is fixed between the opening of the first shell and the opening of the second shell, a slot is formed in the second shell, and the slot is used for the coil and the electric connecting wire of the piezoelectric sheet to pass through.

12. An electronic device, characterized in that: comprising a receiver as claimed in any one of claims 1-11.