CN214481243U

CN214481243U - Bone conduction loudspeaker suitable for mobile phone

Info

Publication number: CN214481243U
Application number: CN202120749499.1U
Authority: CN
Inventors: 吴卫; 邬金林; 谢锦阳
Original assignee: Lizhen Technology Kunshan Co ltd
Current assignee: Lizhen Technology Kunshan Co ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-10-22
Anticipated expiration: 2031-04-13

Abstract

The utility model discloses a bone conduction loudspeaker suitable for cell-phone, it includes the shell that is equipped with hollow groove in, the lid closes the shell upper end opening part seals the PCB board of hollow groove, sets up vibration unit and magnetic circuit unit in the hollow groove, vibration unit includes the shell fragment, sets up the voice coil loudspeaker voice coil on the shell fragment, magnetic circuit unit includes the attached U type magnetism bowl that sets up in PCB board lower surface and back-off above the voice coil loudspeaker voice coil periphery, the laminating sets up the magnet at U type magnetism bowl inner wall top, attach the china department piece of magnet lower surface, adsorb the cyclic annular magnetic fluid that sets up in china department piece peripheral surface; an annular space is formed between the U-shaped magnetic bowl and the magnet, and the voice coil extends into the annular space and surrounds the washer sheet and the magnetic liquid. The utility model discloses sensitivity has been improved greatly, and can direct mount use in the cell-phone display screen.

Description

Bone conduction loudspeaker suitable for mobile phone

Technical Field

The utility model belongs to the technical field of the speaker, especially, relate to a bone conduction loudspeaker suitable for cell-phone.

Background

The sound transmission has two modes, one is air conduction, air conduction for short, and the sound is transmitted to the eardrum by utilizing the principle of air vibration and then transmitted to the inner ear nerve through the eardrum. As the bone conduction technology is more widely applied, the technology is also applied to mobile phones. The mobile phone adopting the technology can be used in a noisy environment and is also suitable for deaf and disabled people. However, most of the various bone conduction devices on the market use piezoelectric bone conduction devices, and the device has the greatest defect of narrow bandwidth and low sensitivity.

Therefore, there is a need to provide a new bone conduction speaker suitable for mobile phone to solve the above problems.

Disclosure of Invention

A primary object of the present invention is to provide a bone conduction speaker suitable for mobile phone, which greatly improves the sensitivity, has a wide working frequency, and can be directly installed in the display screen of the mobile phone.

The utility model discloses a following technical scheme realizes above-mentioned purpose: a bone conduction loudspeaker suitable for a mobile phone comprises a shell, a PCB, a vibration unit and a magnetic circuit unit, wherein a hollow groove is formed in the shell, the PCB covers an opening at the upper end of the shell and closes the hollow groove, the vibration unit and the magnetic circuit unit are arranged in the hollow groove, the vibration unit comprises an elastic sheet and a voice coil arranged on the elastic sheet, the magnetic circuit unit comprises a U-shaped magnetic bowl, a magnet, a washer sheet and annular magnetic liquid, the U-shaped magnetic bowl is attached to the lower surface of the PCB and is reversely buckled above the periphery of the voice coil, the magnet is attached to the top of the inner wall of the U-shaped magnetic bowl, the washer sheet is attached to the lower surface of the magnet, and the annular magnetic liquid is adsorbed on the peripheral surface of the washer sheet; an annular space is formed between the U-shaped magnetic bowl and the magnet, and the voice coil extends into the annular space and surrounds the washer sheet and the magnetic liquid.

Furthermore, an annular step supporting surface is arranged in the hollow groove, and the elastic sheet is arranged on the annular step supporting surface.

The support is arranged between the elastic sheet and the PCB and is of an annular structure, and the peripheral edge of the elastic sheet is pressed downwards by the pressing force of the PCB.

Furthermore, the elastic sheet is provided with a pair of first notches which are symmetrically distributed, a pair of second notches which are symmetrically distributed and a pair of third notches which are symmetrically distributed; the pair of first notches are located on the same first circumference; the pair of second notches are located on the same second circumference; the pair of third notches are positioned on the same third circumference; the first circumference, the second circumference and the third circumference are concentrically arranged, and the diameters of the first circumference, the second circumference and the third circumference are different from each other.

Furthermore, the central connecting line of the pair of first notches is vertically intersected with the central connecting line of the pair of second notches, and the intersection point is superposed with the circle center of the elastic sheet; the central connecting line of the pair of second notches is vertically intersected with the central connecting line of the pair of third notches, and the intersection point is superposed with the circle center of the elastic sheet.

Further, the first notch, the second notch and the third notch are all arc structures.

Furthermore, buffering foam is arranged in a space between the lower part of the elastic sheet and the shell.

Furthermore, the elastic sheet and the voice coil are coaxially arranged; the washer piece, the magnet, the magnetic fluid and the voice coil are coaxially arranged.

Further, the washer sheet covers the entire lower surface of the magnet.

Furthermore, the lower surface of the shell is reversely buckled and attached to the inner side of the display screen of the mobile phone.

Compared with the prior art, the utility model is suitable for a bone conduction loudspeaker of cell-phone's beneficial effect lies in: by adding the magnetic liquid into the magnetic circuit unit, the medium-high frequency effect and the effective bandwidth of the loudspeaker are improved, and the structural design of the notch on the elastic sheet is combined, so that the amplitude of the elastic sheet is uniform during working, medium-high frequency distortion is reduced, the sensitivity is greatly improved, lower distortion is realized, and the application range is improved; and sound holes do not need to be formed, so that the manufacturing cost of the mobile phone is reduced.

Drawings

Fig. 1 is a schematic diagram of an explosive structure according to an embodiment of the present invention;

fig. 2 is another schematic diagram of an explosive structure according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;

fig. 4 is a schematic view of a state structure of the embodiment of the present invention disposed on a display screen of a mobile phone;

fig. 5 is a schematic structural view of a spring plate in an embodiment of the present invention;

fig. 6 is a graph of effective bandwidth test according to an embodiment of the present invention;

100 bone conduction speaker for mobile phone;

101, a mobile phone display screen;

1, a hollow groove, 11 an annular step supporting surface; 2, a shell; 3, a PCB board; 4 vibration unit, 41 spring plate, 411 first notch, 412 second notch, 413 third notch, 42 voice coil; 5, magnetic circuit unit, 51 magnetic bowl, 52 magnet, 53 washer sheet and 54 annular magnetic liquid; 6, a bracket; 7 buffer foam.

Detailed Description

The first embodiment is as follows:

referring to fig. 1 to 5, the present embodiment is a bone conduction speaker 100 suitable for a mobile phone, which includes a housing 2 having a hollow groove 1 therein, a PCB 3 covering an opening at an upper end of the housing 2 to close the hollow groove 1, a vibration unit 4 disposed in the hollow groove 1, and a magnetic circuit unit 5, wherein the vibration unit 4 includes a spring 41 and a voice coil 42 disposed on the spring 41, and the magnetic circuit unit 5 includes a U-shaped magnetic bowl 51 attached to a lower surface of the PCB 3 and reversely buckled above an outer periphery of the voice coil 42, a magnet 52 attached to a top portion of an inner wall of the U-shaped magnetic bowl 51, a washer 53 attached to a lower surface of the magnet 52, and an annular magnetic liquid 54 adsorbed to an outer peripheral surface of the washer 53.

By arranging the annular magnetic liquid 54, the medium-high frequency extension can be improved, the high-temperature energy generated when the voice coil works is reduced, and the medium-high frequency of the loudspeaker is improved.

The shell 2 is made of soft materials, and can be selected from rubber, silica gel and the like, so that the damping effect is achieved.

The embodiment further comprises a support 6, the support 6 is arranged between the elastic sheet 41 and the PCB 3, the support 6 is of an annular structure, and the peripheral edge of the elastic sheet 41 is pressed downwards by the pressing force of the PCB 3.

An annular step supporting surface 11 is arranged in the hollow groove 1, and the elastic sheet 41 is arranged on the annular step supporting surface 11.

The elastic sheet 41 is provided with a pair of first notches 411, a pair of second notches 412 and a pair of third notches 413 which are symmetrically distributed; the pair of first notches 411 are located on the same circumference; the pair of second notches 412 are located on the same circumference; the pair of third notches 413 are located on the same circumference. The center connecting line of the pair of first notches 411 and the center connecting line of the pair of second notches 412 are perpendicularly intersected, and the intersection point coincides with the center of the elastic sheet 41. The central connecting line of the pair of second notches 412 is vertically intersected with the central connecting line of the pair of third notches 413, and the intersection point is overlapped with the center of the elastic sheet 41. The first notch 411, the second notch 412 and the third notch 413 are all arc structures.

In the prior art, the number of the notches of the elastic sheet is large, the amplitude of the elastic sheet is unstable and easy to deform during work, so that medium-high frequency distortion is caused, the shape of the notch is changed, the ductility of the elastic sheet is increased through the structure and layout design of the first notch 411, the second notch 412 and the third notch 413 on the elastic sheet 41, the amplitude of the elastic sheet is uniform during work, and the medium-high frequency distortion is reduced; the medium-high frequency effect is further improved on the premise of keeping the low frequency, the method is suitable for various users, and the application range is greatly improved.

The lower surface of the elastic sheet 41 is provided with a buffer foam 7. When the vibration unit 4 works, the effects of buffering and stopping can be achieved. The spring plate 41 is disposed coaxially with the voice coil 42. The elastic sheet 41 is a metal vibrating sheet, and the thickness thereof is 0.1 mm.

An annular space is formed between the U-shaped magnetic bowl 51 and the magnet 52, and the voice coil 42 extends into the annular space and surrounds the washer 53 and the magnetic liquid 54. Washer pieces 53 cover the entire lower surface of magnet 52 and mainly serve a magnetic conductive function. Magnetic lines of force generated by the magnet 52 diffract to form an irregular and uneven magnetic field in the annular space, and the magnetic lines of force can be regularly and evenly distributed around the periphery of the magnet 52 after being subjected to magnetic conduction action by the washer 53 to form an even magnetic field, so that the effects of improving the sensitivity of the horn and reducing distortion are achieved.

The washer 53, the magnet 52, the magnetic fluid 54, and the voice coil 42 are coaxially disposed. The voice coil 42 is electrically connected to the PCB board 3.

The upper surface of the PCB board 3 is flush with the upper surface of the housing 2.

Bone conduction loudspeaker 100 level sets up inboard at cell-phone display screen 101, specifically, the laminating setting is inboard at cell-phone display screen 101 behind the lower surface back-off of shell 2. When the vibration unit 4 is used, the whole body is parallel to the human body, so that the sensitivity of vibration receiving can be further improved, and the receiving efficiency is improved.

Bone conduction loudspeaker 100 receives user's speech information and passes through cheek vibration and then transmits to cell-phone display screen 1 to bone conduction loudspeaker 100, and the cell-phone display screen need not to open into the sound hole, reduces the high cost of formation because of cell-phone display screen glass trompil causes by a wide margin.

In this embodiment, in order to verify the validity of the present solution, the effective bandwidth is measured, and the measurement result is shown in fig. 6, and as can be seen from fig. 6, the effective bandwidth of the actually measured curve in the present solution is 100Hz to 10000 Hz.

The embodiment is suitable for the bone conduction loudspeaker 100 of the mobile phone, greatly improves the sensitivity, improves the effective bandwidth and the medium and high audio frequency, and improves the application range; and sound holes do not need to be formed, so that the manufacturing cost of the mobile phone is reduced.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. The utility model provides a bone conduction loudspeaker suitable for cell-phone which characterized in that: the vibration unit comprises an elastic sheet and a voice coil arranged on the elastic sheet, the magnetic circuit unit comprises a U-shaped magnetic bowl which is attached to the lower surface of the PCB and is buckled upside down above the periphery of the voice coil, a magnet which is attached to the top of the inner wall of the U-shaped magnetic bowl, a washer sheet which is attached to the lower surface of the magnet, and annular magnetic liquid which is adsorbed on the peripheral surface of the washer sheet; an annular space is formed between the U-shaped magnetic bowl and the magnet, and the voice coil extends into the annular space and surrounds the washer sheet and the magnetic liquid.

2. The bone conduction speaker adapted for use in a handset of claim 1, wherein: an annular step supporting surface is arranged in the hollow groove, and the elastic sheet is arranged on the annular step supporting surface.

3. The bone conduction speaker adapted for use in a handset of claim 2, wherein: the support is arranged between the elastic sheet and the PCB and is of an annular structure, and the peripheral edge of the elastic sheet is pressed downwards by the pressing force of the PCB.

4. The bone conduction speaker adapted for use in a handset of claim 1, wherein: the elastic sheet is provided with a pair of first notches which are symmetrically distributed, a pair of second notches which are symmetrically distributed and a pair of third notches which are symmetrically distributed; the pair of first notches are located on the same first circumference; the pair of second notches are located on the same second circumference; the pair of third notches are positioned on the same third circumference; the first circumference, the second circumference and the third circumference are concentrically arranged, and the diameters of the first circumference, the second circumference and the third circumference are different from each other.

5. The bone conduction speaker adapted for use in a handset of claim 4, wherein: the central connecting line of the pair of first notches is vertically intersected with the central connecting line of the pair of second notches, and the intersection point is superposed with the circle center of the elastic sheet; the central connecting line of the pair of second notches is vertically intersected with the central connecting line of the pair of third notches, and the intersection point is superposed with the circle center of the elastic sheet.

6. The bone conduction speaker adapted for use in a handset of claim 4, wherein: the first notch, the second notch and the third notch are all arc structures.

7. The bone conduction speaker adapted for use in a handset of claim 1, wherein: and a buffer foam is arranged in the space between the lower part of the elastic sheet and the shell.

8. The bone conduction speaker adapted for use in a handset of claim 1, wherein: the elastic sheet and the voice coil are coaxially arranged; the washer piece, the magnet, the magnetic fluid and the voice coil are coaxially arranged.

9. The bone conduction speaker adapted for use in a handset of claim 1, wherein: the washer sheet covers the entire lower surface of the magnet.

10. The bone conduction speaker adapted for use in a handset of claim 1, wherein: the lower surface back-off laminating setting of shell is inboard at the cell-phone display screen.