CN107172544B

CN107172544B - Vibrator and electronic device

Info

Publication number: CN107172544B
Application number: CN201710303241.7A
Authority: CN
Inventors: 王洪兴; 郭顺
Original assignee: Ruisheng Technology Nanjing Co Ltd
Current assignee: Ruisheng Technology Nanjing Co Ltd
Priority date: 2017-05-02
Filing date: 2017-05-02
Publication date: 2020-07-07
Anticipated expiration: 2037-05-02
Also published as: CN107172544A

Abstract

The invention relates to the field of vibration and sound production, in particular to a vibrator and an electronic device, wherein the vibrator is arranged in electronic equipment and used for driving the electronic equipment to vibrate and sound; one of the vibrator and the stator comprises magnetic steel, and the other one comprises a coil; the vibrator satisfies the following conditions: the value of BL/R of the vibrator is more than or equal to 0.026 T.m/omega, and the resonant frequency of the vibrator is less than or equal to 1000 Hz; wherein, B is equivalent magnetic induction intensity, L is the length of the coil, and R is the direct current resistance of the coil. The vibrator has a good function of driving the electronic equipment to sound, and can effectively realize the function of a receiver.

Description

Vibrator and electronic device

Technical Field

The invention relates to the field of vibration sounding, in particular to a vibrator and an electronic device.

Background

In most electronic products, the main functions of the vibrator are vibration reminding and vibration feedback, and there is little description about the vibrator driving an electronic device or a housing of the electronic device to implement a sound generating function. Particularly, for a one-dimensional spring oscillator device based on electromagnetic driving, the performance design only considers vibration factors, and completely takes the requirements of vibration reminding and vibration feedback as the reference, and does not consider the application of a hazelnut device in vibration sounding, and how to design the key performance parameters of the device to realize vibration sounding and meet the call requirement through vibration sounding. Therefore, how to improve the sounding effect of the vibrator is a problem to be solved at present.

Disclosure of Invention

The invention aims to provide a vibrator and an electronic device, which can improve the sound production effect of a vibrating device.

In order to solve the technical problem, an embodiment of the present invention provides a vibrator installed in an electronic device and configured to drive the electronic device to vibrate and generate sound, where the vibrator includes a vibrator, a stator, and an elastic member suspending the vibrator; one of the vibrator and the stator comprises magnetic steel, and the other one comprises a coil; the vibrator satisfies the following conditions: the value of BL/R of the vibrator is more than or equal to 0.026 T.m/omega, and the resonant frequency of the vibrator is less than or equal to 1000 Hz; and B is equivalent magnetic induction intensity, L is the length of the coil, and R is the direct current resistance of the coil.

Further, the resonance frequency of the vibrator is 100-300 Hz.

Further, the mass of the oscillator is less than 3 g.

Further, the vibrator is a linear vibrator.

Further, the electronic device comprises a shell and a screen panel installed on the shell; the vibration direction of the vibrator is perpendicular to the housing or the screen panel.

Further, the vibrator comprises a magnetic bowl with a bottom wall and a side wall, and the side wall is arranged around the bottom wall to form an accommodating space; magnetic steel is further fixed in the accommodating space of the magnetic bowl, and magnetic gaps are formed between the magnetic steel and the side walls of the magnetic bowl at intervals;

the stator includes a coil, and the coil is inserted in the magnetic gap.

Further, the oscillator further comprises a mass block with a containing hole, and the magnetic bowl is contained and fixed in the containing hole.

Further, the vibrator comprises a mass block and a coil fixed on the mass block;

the stator comprises a magnetic bowl with a bottom wall and a side wall, and the side wall is arranged around the bottom wall to form an accommodating space; magnetic steel is further fixed in the accommodating space of the magnetic bowl, and magnetic gaps are formed between the magnetic steel and the side walls of the magnetic bowl at intervals; the coil is inserted in the magnetic gap.

The embodiment of the invention also provides an electronic device which comprises a shell, a screen panel arranged on the shell and the vibrator.

Compared with the prior art, the method and the device have the advantages that the parameters of the vibrator meet the following conditions: the value of BL/R is more than or equal to 0.026 T.m/omega, and the resonant frequency of the vibrator is less than or equal to 1000 Hz; the vibrator has the advantages that the vibrator can be driven to generate complete human voice information, and the vibrator can be driven to generate human voice information. The vibrator has a good function of driving the electronic equipment to generate sound, and can effectively realize the function of a receiver.

Drawings

Fig. 1 is a typical frequency response graph of a driving force externally output from a vibrator according to a preferred embodiment of the present invention;

FIG. 2 is a comparison chart of sound production effects according to a preferred embodiment of the present invention;

FIG. 3 is a graph comparing the frequency response of an exemplary output driving force of a vibrator according to a preferred embodiment of the present invention;

FIG. 4 is a schematic view of a vibrator according to a first embodiment of the present invention;

fig. 5 is a schematic view of a vibrator according to a second embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

The present invention relates to a vibrator. Fig. 4-5 show a schematic of the vibrator of the present invention. Referring to fig. 4-5, the vibrator of the present invention is preferably an electromagnetically driven one-dimensional linear vibrator, which is mounted in an electronic device (not shown), and is used for driving the electronic device to vibrate and generate sound with good sound generation effect. In the present embodiment, the vibrator is preferably a linear type vibration motor.

In the present embodiment, as shown in fig. 4 to 5, the vibrator includes a vibrator, a stator, and an elastic member 6 suspending the vibrator; wherein, one of the vibrator and the stator comprises a magnetic steel 4, the other comprises a coil 1, and the vibration direction of the vibrator is along the vertical direction (in this embodiment, the direction perpendicular to the screen panel or the shell of the electronic device). In order for the vibrator to produce a good sound-emitting effect, the vibrator needs to satisfy the following conditions:

the value of BL/R of the vibrator is more than or equal to 0.026 T.m/omega, and the resonant frequency of the vibrator is less than or equal to 1000 Hz. Wherein, B is the equivalent magnetic induction, L is the length of the coil 1, and R is the dc resistance of the coil 1.

In particular, for audio applications, a wide frequency band response is particularly important, for example, the main frequency range of the sound of a normal person speaking is 300-. Therefore, for the vibrator, the vibrator needs to provide a sufficiently large driving force to the electronic apparatus, and the frequency band is sufficiently wide. Fig. 1 is a typical frequency response curve of a driving force externally output from a vibrator. As shown in fig. 1, the portion of the output driving force within the circle covers a wide frequency band, particularly, a mid-high frequency band. In this segment, the magnitude of the driving force is positively correlated with the electromagnetic force F. The electromagnetic forces F and BL are positively correlated, and the electromagnetic forces F and R are negatively correlated. Therefore, when a certain external input voltage is applied, a sufficient driving force, that is, a sufficiently large value of BL/R is required to obtain a good sound emission effect.

Referring to FIG. 2, the abscissa of the graph is the frequency/Hz of the vibrator, the ordinate is the sound pressure level SPL/dB, and in the range of 300Hz and 3400Hz of the vibrator, curve A represents the sound effect diagram of the ordinary receiver, and curve B represents the sound effect diagram when the BL/R value is 0.026. Through experimental research, when the value of BL/R is less than 0.026 T.m/omega, the sound pressure level SPL of the electronic equipment driven by the vibrator to produce sound is far less than that of a common receiver, and when the value of BL/R is 0.026, as can be seen from the figure, the difference between the SPL and the common receiver is reduced to about 6dB, and at the moment, the sound production effect of the electronic equipment driven by the vibrator approaches to that of the common receiver. Therefore, it is easy to find that if the vibrator is to obtain a good generation effect, i.e., to transmit complete vocal information, the value of BL/R is required to be 0.026t.m/Ω or more.

Further, the selection of the resonant frequency of the vibrator is also important. The resonant frequency cannot be too high, and if the resonant frequency is too high, the driving force of the low frequency will be insufficient, which will greatly affect the effect of the vibration sounding at the low frequency. As shown in fig. 3, the resonant frequency of the vibrator corresponding to curve D is approximately 1180Hz, which has a better response at and around the resonant frequency and can provide a stronger driving force to the outside, but its response at low frequencies is significantly weaker, as shown in the area marked by the dashed line in curve C. Therefore, in order to achieve the response of the driving force at low frequencies, it is preferable that the resonant frequency reference curve C of the vibrator is in the range of about 100-300 Hz. Further, the mass of the vibrator is preferably less than 3 g.

In addition, the above mentioned electronic device includes a housing and a screen panel mounted on the housing, the vibration direction of the vibrator is perpendicular to the housing or the panel, the specific situation is determined by the actual component to be driven by the vibrator, and when the component to be driven is the housing, the vibration direction of the vibrator is perpendicular to the housing; when the member to be driven is a screen panel, the vibration direction of the vibrator is perpendicular to the screen panel.

Fig. 4 shows an embodiment of the vibrator of the present invention. In the embodiment shown in fig. 4, the transducer comprises a magnetic bowl having a bottom wall 2 and a side wall 3. Wherein, the bottom wall 2 is connected with the elastic element 6, and the side wall 3 is arranged around the bottom wall 2, and the side wall 3 and the bottom wall 2 form a containing space. Still be fixed with magnet steel 4 in the accommodation space of magnetism bowl, magnet steel 4 is the permanent magnetism alloy that has the super hardness, generally sets up the central point at the magnetism bowl and puts, and magnet steel 4's peripheral diameter is less than the internal diameter of magnetism bowl to separate with the lateral wall 3 of magnetism bowl, magnet steel 4 and the interval of the lateral wall 3 of magnetism bowl have formed the magnetic gap.

In this embodiment, the stator includes a coil 1, and the coil 1 is inserted into the magnetic gap, when the direction of the current in the coil 1 changes, the magnetic field generated by the coil 1 changes, and at this time, the coil 1 and the magnetic steel 4 attract or repel each other, so that the vibrator vibrates.

In addition, the vibrator further comprises a mass block 5 with a containing hole, the containing hole is preferably arranged on the central axis of the mass block 5, the inner diameter of the containing hole is approximately the same as the outer diameter of the magnetic bowl, the magnetic bowl is contained and fixed in the containing hole, and the mass of the vibrator can be adjusted by using the mass block 5 with different weights.

In the present embodiment, the elastic member may be a spring 6.

Fig. 5 shows a second embodiment of the vibrator of the present invention. In the embodiment shown in fig. 5, the vibrator comprises a mass 25 and a coil 21 fixed to the mass 25, wherein the mass 25 is connected to a spring 26.

The stator is including the magnetism bowl that has diapire 22 and lateral wall 23, wherein, lateral wall 23 sets up around diapire 22, lateral wall 23 forms an accommodation space with diapire 22, it should explain that, still be fixed with magnet steel 24 in the accommodation space of magnetism bowl, magnet steel 24 is the permanent magnetism alloy that has the super hardness, generally sets up the central point at the magnetism bowl, and magnet steel 24's peripheral diameter is less than the internal diameter of magnetism bowl to magnet steel 24 separates with the lateral wall 23 of magnetism bowl, makes magnet steel 24 and the interval of the lateral wall 23 of magnetism bowl form the magnetic gap.

The coil 21 is inserted into the magnetic gap, and when the direction of the current in the coil 21 changes, the magnetic field generated by the energized coil 21 changes, so that the coil 21 and the magnetic steel 24 attract or repel each other, and the vibrator vibrates.

The present invention also relates to an electronic device, which may be a mobile phone or a tablet computer, and the embodiment is not particularly limited thereto, and it should be noted that the electronic device includes a housing and a screen panel mounted on the housing, and in addition, the electronic device further includes the vibrator. Wherein, the vibration direction of the vibrator is perpendicular to the shell or the screen panel of the electronic device. It is worth mentioning that the vibrator can drive the shell or the screen to vibrate, so that a good sound production effect is generated, and the function of the receiver can be effectively realized by the vibrator. In summary, since the value of BL/R of the vibrator is greater than or equal to 0.026t.m/Ω, and the resonant frequency of the vibrator is less than or equal to 1000Hz, the output frequency band of the vibrator is relatively wide, and thus the electronic device can be driven to generate relatively complete human voice information. The vibrator has a good function of driving the electronic equipment to generate sound, and can effectively realize the function of a receiver.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A vibrator is arranged in an electronic device and used for driving the electronic device to vibrate and sound, and comprises a vibrator, a stator and an elastic piece for suspending the vibrator; one of the vibrator and the stator comprises magnetic steel, the other one of the vibrator and the stator comprises a coil, and the elastic part falls onto the magnetic steel along the vibration direction of the vibrator towards the orthographic projection of the magnetic steel; characterized in that the vibrator satisfies the following conditions:

the value of BL/R of the vibrator is more than or equal to 0.026 T.m/omega, and the resonant frequency of the vibrator is less than or equal to 1000 Hz;

and B is equivalent magnetic induction intensity, L is the length of the coil, and R is the direct current resistance of the coil.

2. The vibrator according to claim 1, wherein the vibrator has a resonant frequency of 100-300 Hz.

3. The vibrator according to claim 1, wherein the mass of the vibrator is less than 3 g.

4. The vibrator according to claim 1, wherein the vibrator is a linear vibrator.

5. The vibrator according to claim 1, wherein the electronic device comprises a housing and a screen panel mounted on the housing; the vibration direction of the vibrator is perpendicular to the housing or the screen panel.

6. The vibrator according to claim 1, wherein the vibrator includes a magnetic bowl having a bottom wall and a side wall, and the side wall is disposed around the bottom wall to form an accommodation space; magnetic steel is further fixed in the accommodating space of the magnetic bowl, and magnetic gaps are formed between the magnetic steel and the side walls of the magnetic bowl at intervals;

the stator includes a coil, and the coil is inserted in the magnetic gap.

7. The vibrator according to claim 6, wherein the vibrator further comprises a mass having a receiving hole, and the magnetic bowl is received and fixed in the receiving hole.

8. The vibrator according to claim 1, wherein the vibrator includes a mass and a coil fixed to the mass;

9. An electronic device comprising a housing and a screen panel mounted on the housing, further comprising a vibrator according to any one of claims 1 to 8.