CN210958708U - Optical bone conduction microphone - Google Patents

Abstract

The utility model provides an optical bone conduction microphone, which comprises a substrate, an annular cavity fixed on the substrate and forming an accommodating space with the substrate, a signal processing device arranged in the accommodating space, a spring leaf with the periphery attached to one end face of the annular cavity far away from the substrate, a quality sheet suspended above the signal processing device and arranged in the accommodating space through the spring leaf, and a shell with the periphery attached to the spring leaf to seal the accommodating space; the signal processing device comprises a microphone chip and an optical distance sensor integrated on the microphone chip, and the microphone chip converts an electric signal in the optical distance sensor into a sound signal. The utility model discloses an optics osteoacusis microphone obtains the change of osteoacusis signal according to the change of light signal to realize the conversion of osteoacusis signal to sound signal, and simple structure, the stable performance has still simplified the encapsulation step, reduce cost.

Description

Optical bone conduction microphone

[ technical field ] A method for producing a semiconductor device

The utility model relates to a transducer especially relates to an optics bone conduction microphone.

[ background of the invention ]

The bone conduction microphone collects and converts sound signals into electric signals by utilizing slight vibration of bones of the head and the neck caused by speaking of a person. Since the microphone collects sound through air conduction unlike a conventional microphone, the microphone can clearly transmit sound in a noisy environment, and thus bone conduction has a significant advantage over air conduction.

However, the existing bone conduction microphone is generally complex in structure and high in packaging cost, and therefore, a new optical bone conduction microphone is needed to be provided, so that the structure and the packaging mode are simplified, and the cost is reduced.

[ Utility model ] content

An object of the utility model is to provide an optics bone conduction microphone to it is complicated to solve current bone conduction microphone structure, problem that the encapsulation cost is high.

The technical scheme of the utility model as follows: 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 of which the periphery is attached to one end face, far away from the substrate, of the annular cavity, a mass piece which is suspended above the signal processing device through the spring piece and is arranged in the accommodating space, and a shell of which the periphery is attached to the spring piece to seal the accommodating space;

the signal processing device comprises a microphone chip and an optical distance sensor integrated on the microphone chip, wherein the microphone chip converts an electric signal in the optical distance sensor into a sound signal;

when the bone conduction signal is transmitted to the optical bone conduction microphone, the mass plate and the signal processing device move relatively, so that an optical signal received by an optical distance sensor in the signal processing device changes, and an electric signal input into the microphone chip by the optical distance sensor is changed.

Further, the annular cavity comprises a first end face fixed on the substrate and a second end face attached to the spring piece.

Further, the shell comprises a top part, a folded ring part and a fixing part, wherein the folded ring part extends outwards from the top part, and the fixing part extends outwards from the folded ring part.

Further, the spring piece comprises a central part, an annular folded ring surrounding the central part, and an outer contour surrounding the annular folded ring;

the outer contour is clamped between the housing and the substrate, and the mass plate is fixed to the central portion.

Furthermore, the annular folding ring is provided with hollow patterns.

Further, the annular folded ring corresponds to the position of the folded ring part.

The beneficial effects of the utility model reside in that: the optical bone conduction microphone comprises a substrate and an annular cavity, wherein the substrate and the annular cavity form an accommodating space, the accommodating space is packaged through a spring piece and a shell, a mass piece is further suspended on the spring piece, a signal processing device is accommodated in the accommodating space, the mass piece and the signal processing device are in up-and-down correspondence, the signal processing device comprises a microphone chip and an optical distance sensor integrated on the microphone chip, when a bone conduction signal is transmitted into the optical bone conduction microphone, relative motion occurs between the mass piece and the signal processing device, an optical signal reflected by the mass piece to the optical distance sensor changes, namely the optical signal received by the optical distance sensor changes, an electric signal input into the microphone chip by the optical distance sensor is changed, and the microphone chip is used for converting the electric signal in the optical distance sensor into a sound signal, the change of the bone conduction signal is obtained according to the change of the optical signal, so that the conversion from the bone conduction signal to the sound signal is realized, the structure is simple, the performance is stable, the packaging step is simplified, and the cost is reduced.

[ description of the drawings ]

Fig. 1 is a schematic perspective view of an optical bone conduction microphone according to an embodiment of the present invention;

fig. 2 is an exploded perspective view of an optical bone conduction microphone according to an embodiment of the present invention;

fig. 3 is a cross-sectional view taken along the line a-a in fig. 1.

[ detailed description ] embodiments

The present invention will be further described with reference to the accompanying drawings and embodiments.

Referring to fig. 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, which are sequentially disposed, and as shown in the three-dimensional structure exploded view of the optical bone conduction microphone 100 shown in fig. 2 and the cross-sectional view shown in fig. 3, it can be seen that the substrate 10 and the annular cavity 20 fixed on the substrate 10 form an accommodating space, the periphery of the housing 40 is attached to the spring plate 30 to seal the accommodating space, thereby completing the packaging of the optical bone conduction microphone 100, in addition, a signal processing device 50 and a mass plate 60 are disposed in the accommodating space, and the mass plate 60 is suspended above the signal processing device 50 through the spring plate 30.

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

The microphone chip is used for converting an electric signal in the optical distance sensor into a sound signal; the mass plate 60 is used to reflect the optical signal.

In a specific application, when the bone conduction signal is transmitted to the optical bone conduction microphone 100, relative motion occurs between the mass plate 60 and the signal processing device 50, and at this time, due to the change of the distance between the mass plate 60 and the signal processing device 50, the optical signal received by the optical distance sensor in the signal processing device 50 also changes, so that the electrical signal input to the microphone chip by the optical distance sensor is changed. The bone conduction signal is a signal formed by the transmission of slight vibration of the head and neck bones to the microphone when a user speaks towards the microphone. Therefore, through the embodiment of the utility model provides an optics bone conduction microphone obtains the change of bone conduction signal according to the change of light signal to realize the conversion of bone conduction signal to sound signal, and simple structure, the stable performance has still simplified the encapsulation step, reduce cost.

As shown in fig. 1 and 3, one end surface of the annular cavity 20 is fixed on the substrate 10, and one end surface away from the substrate 10 is in contact with the spring piece 30, wherein the periphery of the spring piece 30 is attached to one end surface of the annular cavity 20 away from the substrate 10.

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

Wherein, the distance between the first end face and the second end face can be regarded as the height of the annular cavity 20, and the signal processing device 50 and the mass plate 60 are both in the accommodating space, and the mass plate 60 is suspended above the signal processing device 50 by being fixed on the spring piece 30, 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 piece 30 and the contact surface of the signal processing device 50 and the substrate 10 is not more than the height of the annular cavity 20, that is, the signal processing device 50 and the mass plate 60 are both in the accommodating space, and the height of the annular cavity 20 is more than the sum of the heights of the signal processing device 50 and the mass plate 60. The signal processing device 50 and the mass sheet 60 are not bonded to each other, and a gap is provided between the signal processing device 50 and the mass sheet 60, so that the signal processing device 50 receives the light signal reflected by the mass sheet 60.

The housing 40 is used to seal the housing space, and the peripheral edge of the housing 40 is attached to the spring piece 30 to seal the housing space formed by the substrate 10 and the annular cavity 20 fixed to the substrate 10.

A detailed structure of the housing 40 is shown in fig. 1 to 3, and includes a top portion 41, a hinge portion 42 extending outwardly from the top portion 41, and a fixing portion 43 extending outwardly from the hinge portion 42.

Fig. 2 shows an exemplary detail of the spring plate 30, which comprises a central part 31, an annular fold 32 surrounding the central part 31, an outer contour 33 surrounding the annular fold 32; the outer contour 33 is clamped between the housing 40 and the substrate 10. The annular edge 32 is further provided with a hollow pattern, and the annular edge 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 all vibrate, but because the mass plate 60 is fixed on the central portion 31 of the spring plate 30, the mass of the mass plate 60 is large, the annular folded ring 32 of the spring plate 30 cannot drive the central portion 31 to vibrate, so that the vibration amount of the mass plate 60 is very small or does not vibrate, therefore, relative motion occurs between the mass plate 60 and the signal processing device 50, the distance between the mass plate 60 and the signal processing device 50 changes due to the relative motion, and the optical signal received by the signal processing device 50 also changes, so that the electrical signal input to the microphone chip is changed and converted into an audio signal.

Referring to fig. 1 to 3, in the embodiment of the present invention, the annular folded ring 32 of the spring plate 30 further corresponds to the position of the folded ring portion 42 of the housing 40.

To sum up, the embodiment of the present invention provides an optical bone conduction microphone, which comprises a substrate and an annular cavity, and a spring plate and a housing enclosing the accommodating space, wherein a mass plate is further fixed on the spring plate, a signal processing device is accommodated in the accommodating space, the mass plate and the signal processing device are vertically corresponding, and the signal processing device comprises a microphone chip and an optical distance sensor integrated on the microphone chip, when a bone conduction signal is transmitted to the optical bone conduction microphone, a relative motion occurs between the mass plate and the signal processing device, and an optical signal reflected by the mass plate to the optical distance sensor changes, that is, the optical signal received by the optical distance sensor changes, an electrical signal input from the optical distance sensor to the microphone chip is changed, and the microphone chip is used for converting the electrical signal in the optical distance sensor into a sound signal, the change of the bone conduction signal is obtained according to the change of the optical signal, so that the conversion from the bone conduction signal to the sound signal is realized, the structure is simple, the performance is stable, the packaging step is simplified, and the cost is reduced.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims (6)

1. An optical bone conduction microphone is characterized by comprising 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 of which the periphery is attached to one end face, far away from the substrate, of the annular cavity, a mass piece which is suspended above the signal processing device through the spring piece and is arranged in the accommodating space, and a shell of which the periphery is attached to the spring piece to seal the accommodating space;

the signal processing device comprises a microphone chip and an optical distance sensor integrated on the microphone chip, wherein the microphone chip converts an electric signal in the optical distance sensor into a sound signal;

when the bone conduction signal is transmitted to the optical bone conduction microphone, the mass plate and the signal processing device move relatively, so that an optical signal received by an optical distance sensor in the signal processing device changes, and an electric signal input into the microphone chip by the optical distance sensor is changed.

2. The optical bone conduction microphone according to claim 1, wherein the annular cavity includes a first end surface fixed to the substrate and a second end surface attached to the spring plate.

3. The optical bone conduction microphone of claim 1, wherein the housing includes a top portion, a corrugated portion extending outwardly from the top portion, and a fixation portion extending outwardly from the corrugated portion.

4. The optical bone conduction microphone according to claim 3, wherein the spring plate includes a central portion, an annular fold surrounding the central portion, an outer contour surrounding the annular fold;

the outer contour is clamped between the housing and the substrate, and the mass plate is fixed to the central portion.

5. The optical bone conduction microphone according to claim 4, wherein the annular edge is provided with a hollow pattern.

6. The optical bone conduction microphone of claim 5, wherein the annular flexure ring corresponds in position to the flexure ring portion.

Images