WO2021134201A1

WO2021134201A1 - Optical bone conduction microphone

Info

Publication number: WO2021134201A1
Application number: PCT/CN2019/129897
Authority: WO
Inventors: 张金宇; 王凯
Original assignee: 瑞声声学科技(深圳)有限公司
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-07-08

Abstract

Provided in the present utility model is an optical bone conduction microphone. The optical bone conduction microphone comprises: a substrate; an annular cavity, which is fixed on the substrate and forms an accommodating space with the substrate; a signal processing device, which is arranged in the accommodating space; a spring piece, with the periphery thereof attached to an end face of the annular cavity that is away from the substrate; a mass piece, which is suspended above the signal processing device by means of the spring piece and is arranged in the accommodating space; and a shell, with the periphery thereof attached to the spring piece so as to seal the accommodating space, wherein the signal processing device comprises a microphone chip and an optical distance sensor, which is integrated on the microphone chip, and the microphone chip converts an electric signal in the optical distance sensor into a sound signal. With regard to the optical bone conduction microphone of the present utility model, a bone conduction signal change is obtained according to an optical signal change, such that the conversion of a bone conduction signal into a sound signal is realized; and the structure is simple, the performance is stable, an encapsulation step is also simplified, and the cost is reduced.

Description

Optical bone conduction microphone

Technical field

The utility model relates to a transducer, in particular to an optical bone conduction microphone.

Background technique

Bone conduction microphones use the slight vibration of the bones of the head and neck caused by a person's speech to collect sound signals and convert them into electrical signals. Because it is different from the traditional microphone that collects sound through air conduction, it can transmit the sound with high clarity even in a very noisy environment. It can be seen that bone conduction has obvious advantages compared with air conduction.

However, current bone conduction microphones usually have complex structures and high packaging costs. Therefore, it is necessary to provide a new optical bone conduction microphone to simplify the structure and packaging methods and reduce costs.

technical problem

The purpose of the utility model is to provide an optical bone conduction microphone to solve the problems of complex structure and high packaging cost of the existing bone conduction microphone.

Technical solutions

The technical solution of the present invention is as follows: an optical bone conduction microphone is provided, comprising a substrate, a ring-shaped cavity fixed on the substrate and forming an accommodation space with the substrate, and a signal processing device placed in the accommodation space , The peripheral edge is attached to the spring sheet on one end surface of the annular cavity away from the substrate, the quality sheet suspended above the signal processing device through the spring sheet and placed in the receiving space, And a shell whose periphery is attached to the spring sheet to seal the containing space;

The signal processing device includes a microphone chip and an optical distance sensor integrated on the microphone chip, and the microphone chip converts the electrical signal in the optical distance sensor into a sound signal;

When the bone conduction signal is transmitted to the optical bone conduction microphone, relative movement occurs between the mass sheet and the signal processing device, so that the optical signal received by the optical distance sensor in the signal processing device changes and changes the signal The optical distance sensor inputs the electrical signal of the microphone chip.

Further, the annular cavity includes a first end surface fixed on the base plate and a second end surface attached to the spring sheet.

Further, the housing includes a top portion, a folding ring portion extending outward from the top portion, and a fixing portion extending outward from the folding ring portion.

Further, the spring leaf includes a central part, an annular folding ring surrounding the central part, and an outer contour surrounding the annular folding ring;

The outer contour is clamped between the housing and the base plate, and the mass sheet is fixed to the central part.

Further, the annular folding ring is provided with a hollow pattern.

Further, the position of the annular folding ring corresponds to the position of the folding ring portion.

Beneficial effect

The beneficial effect of the utility model is that it provides an optical bone conduction microphone, which is composed of a substrate and a ring cavity to form a receiving space, and the receiving space is packaged by a spring sheet and a shell, wherein a quality sheet is also suspended on the spring sheet A signal processing device is housed in the housing space, and the position of the quality sheet and the signal processing device corresponds up and down, and the signal processing device includes a microphone chip and an optical distance sensor integrated on the microphone chip. When the bone conduction signal is transmitted to the optical bone When conducting the microphone, the relative movement between the mass film and the signal processing device occurs, and the light signal reflected by the mass film to the optical distance sensor changes, that is, the change of the light signal received by the optical distance sensor will change the input of the optical distance sensor to the microphone chip The microphone chip is used to convert the electrical signal in the optical distance sensor into a sound signal, and obtain the change of the bone conduction signal according to the change of the optical signal, so as to realize the conversion of the bone conduction signal to the sound signal, and the structure is simple , The performance is stable, the packaging steps are also simplified, and the cost is reduced.

Description of the drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of an optical bone conduction microphone provided by an embodiment of the present invention;

2 is an exploded view of the three-dimensional structure of the optical bone conduction microphone provided by the embodiment of the utility model;

Fig. 3 is a cross-sectional view in the direction of A-A in Fig. 1.

Embodiments of the present invention

The present utility model will be further explained below in conjunction with the drawings and embodiments.

1 to 3, the embodiment of the present invention first provides a three-dimensional structure of an optical bone conduction microphone 100, which includes a substrate 10, an annular cavity 20, a spring plate 30, and a housing 40 arranged in sequence, and shown in Figure 2 The three-dimensional structure exploded view of the optical bone conduction microphone 100 shown and the cross-sectional view shown in FIG. 3 show that the substrate 10 and the annular cavity 20 fixed on the substrate 10 constitute a receiving space, and the periphery of the housing 40 is attached to the spring sheet The accommodating space 30 is sealed to complete the packaging of the optical bone conduction microphone 100. In addition, the accommodating space is provided with a signal processing device 50 and a mass sheet 60, and the mass sheet 60 is suspended above the signal processing device 50 via a spring sheet 30.

The signal processing device 50 includes a microphone chip and an optical distance sensor integrated on the microphone chip.

The aforementioned microphone chip is used to convert the electrical signal in the optical distance sensor into a sound signal; the quality sheet 60 is used to reflect the light signal.

In a specific application, when the bone conduction signal is transmitted to the optical bone conduction microphone 100, a relative movement occurs between the mass sheet 60 and the signal processing device 50. At this time, due to the change in the distance between the mass sheet 60 and the signal processing device 50 , The optical signal received by the optical distance sensor in the signal processing device 50 also changes, thereby changing the electrical signal input from the optical distance sensor to the microphone chip. Among them, the bone conduction signal is the signal formed by the slight vibration of the bones of the head and neck transmitted to the microphone when the user speaks into the microphone. Therefore, the optical bone conduction microphone provided by the embodiment of the present utility model obtains the change of the bone conduction signal according to the change of the optical signal, thereby realizing the conversion of the bone conduction signal to the sound signal, and has a simple structure, stable performance, and simplified packaging steps. ,lower the cost.

The above-mentioned annular cavity 20 is used to connect with the substrate 10 and the spring plate 30 to form a receiving space. As shown in FIGS. 1 and 3, one end surface of the annular cavity 20 is fixed on the substrate 10, and one end away from the substrate 10 The end surface is in contact with the spring plate 30, wherein the peripheral edge of the spring plate 30 is attached to the end surface of the annular cavity 20 away from the substrate 10.

The example of the present invention also exemplarily shows a detailed structure of the annular cavity 20, which includes a first end surface fixed on the base plate 10 and a second end surface attached to the spring sheet 30.

Wherein, the distance between the first end surface and the second end surface can be regarded as the height of the annular cavity 20, and the above-mentioned signal processing device 50 and the mass plate 60 are both in the containing space, and the mass plate 60 is fixed to the spring plate. 30 is suspended above the signal processing device 50, as shown in FIG. 3, in the embodiment of the present invention, the distance between the contact surface of the mass plate 60 and the spring plate 30 to the contact surface of the signal processing device 50 and the substrate 10 It does not exceed the height of the annular cavity 20, that is, the signal processing device 50 and the mass slice 60 are both in the accommodating space, and the height of the annular cavity 20 is greater than the sum of the height of the signal processing device 50 and the mass slice 60. In addition, the signal processing device 50 and the quality sheet 60 are not attached to each other, and there is a gap between the two for the quality sheet 60 to reflect light signals to the signal processing device 50.

The above-mentioned housing 40 is used to seal the above-mentioned accommodating space. The periphery of the housing 40 is attached to the spring plate 30 to seal the accommodating space formed by the substrate 10 and the annular cavity 20 fixed on the substrate 10.

FIGS. 1 to 3 show a detailed structure of the housing 40, which includes a top 41, a folding ring portion 42 extending outward from the top 41, and a fixing portion 43 extending outward from the folding ring 42.

Figure 2 exemplarily shows a detailed structure of the spring plate 30, which includes a central portion 31, an annular folding ring 32 surrounding the central portion 31, and an outer contour 33 surrounding the annular fold ring 32; the outer contour 33 is clamped in Between the housing 40 and the substrate 10. Wherein, the annular folding ring 32 is also provided with a hollow pattern, and the annular folding ring 32 elastically connects the central portion 31 and the outer contour 33.

When the bone conduction signal is transmitted to the optical bone conduction microphone 100, the substrate 10, the signal processing device 50, the annular cavity 20, the housing 40 and the outer contour 33 of the spring plate 30 will all vibrate, but due to the central part of the spring plate 30 A mass plate 60 is fixed on 31, and the mass of the mass plate 60 is very large. The annular folded ring 32 of the spring plate 30 cannot drive the central part 31 to vibrate, resulting in the mass plate 60 having very little or no vibration. Therefore, the mass plate 60 and the signal The relative movement between the processing devices 50 occurs, the distance between the mass sheet 60 and the signal processing device 50 changes due to the relative movement, and the optical signal received by the signal processing device 50 also changes, thereby changing the electrical signal input to the microphone chip. Converted into a sound signal.

With reference to FIGS. 1 to 3, in the embodiment of the present invention, the annular folding ring 32 of the spring plate 30 also corresponds to the position of the folding ring portion 42 of the housing 40.

To sum up, the embodiment of the present invention provides an optical bone conduction microphone, which is composed of a substrate and a ring cavity to form a receiving space, and the receiving space is packaged by a spring sheet and a shell, wherein the spring sheet is also fixed with a mass The accommodating space contains a signal processing device, and the position of the quality chip and the signal processing device correspond up and down, and the signal processing device includes a microphone chip and an optical distance sensor integrated on the microphone chip. When the bone conduction signal is transmitted to the optical In the bone conduction microphone, relative movement occurs between the mass film and the signal processing device, and the light signal reflected by the mass film to the optical distance sensor changes, that is, the change of the light signal received by the optical distance sensor will change the input of the optical distance sensor to the microphone The electrical signal of the chip, and the microphone chip is used to convert the electrical signal in the optical distance sensor into a sound signal, and obtain the change of the bone conduction signal according to the change of the optical signal, thereby realizing the conversion of the bone conduction signal to the sound signal, and the structure Simple, stable performance, simplifies the packaging steps, and reduces costs.

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to The scope of protection of the utility model.

Claims

An optical bone conduction microphone, characterized in that it comprises a substrate, a ring-shaped cavity fixed on the substrate and forming an accommodation space with the substrate, a signal processing device placed in the accommodation space, and a peripheral edge attached to the The spring sheet on one end surface of the annular cavity away from the substrate, the quality sheet suspended above the signal processing device through the spring sheet and placed in the accommodation space, and the peripheral edge attached to A shell on the spring sheet to seal the receiving space;

The signal processing device includes a microphone chip and an optical distance sensor integrated on the microphone chip, and the microphone chip converts the electrical signal in the optical distance sensor into a sound signal;

When the bone conduction signal is transmitted to the optical bone conduction microphone, relative movement occurs between the mass sheet and the signal processing device, so that the optical signal received by the optical distance sensor in the signal processing device changes and changes the signal The optical distance sensor inputs the electrical signal of the microphone chip.
The optical bone conduction microphone according to claim 1, wherein the annular cavity comprises a first end surface fixed on the substrate and a second end surface attached to the spring sheet.
The optical bone conduction microphone according to claim 1, wherein the housing comprises a top, a folding ring part extending outward from the top, and a fixing part extending outward from the folding ring part.
The optical bone conduction microphone according to claim 3, wherein the spring sheet comprises a central part, an annular folding ring surrounding the central part, and an outer contour surrounding the annular folding ring;

The outer contour is clamped between the housing and the base plate, and the mass sheet is fixed to the central part.
The optical bone conduction microphone according to claim 4, wherein a hollow pattern is provided on the annular folding ring.
The optical bone conduction microphone according to claim 5, wherein the position of the annular folding ring corresponds to the position of the folding ring portion.