Sound wave steering device for digital sounding chip and intelligent glasses

Abstract

The invention provides a sound wave steering device for a digital sound production chip, which is mounted on a substrate of the digital sound production chip and comprises a reflecting part, and the reflecting surface of the reflecting part is opposite to the front surface of a sound production unit array; an intersection line of the reflecting surface and the front surface of the substrate is parallel to one column of the sound production unit array, and the distance from a coordinate point on the reflecting surface to the sound production unit array is monotonically changed along with the distance from the coordinate point to the intersection line; and for any coordinate point on the reflecting surface, a row of straight line segments which pass through the coordinate point and are parallel to the sound production unit array are all positioned on the reflecting surface of the reflecting part. The invention also provides corresponding intelligent glasses. According to the sound wave steering device, the intersecting line is parallel to one column of the sound production unit array, the distance from the reflecting surface to the sound production unit array is monotonically changed, and the straight line segment parallel to one column of the sound production unit array is positioned on the reflecting surface, so that the distortion is as small as possible while sound wave steering is realized.

Description

Technical Field

[0001] The present invention relates to the field of digital sound - generating chips, and in particular to an acoustic wave steering device for a digital sound - generating chip and a smart glasses. Background Art

[0002] Digital sound - generating chips are usually used to emit high - frequency ultrasonic waves carrying low - frequency signals to be played. Such acoustic waves have a certain directivity. In practical engineering applications, due to volume limitations, there are situations where it is necessary to immediately steer the acoustic waves after they are emitted from the chip.

[0003] Traditional speakers play medium and low frequencies, and the wavelengths of the sounds are much larger than the front - cavity structure. Therefore, the distortion after being steered is always very small. However, since digital sound - generating chips essentially play ultra - high - frequency acoustic waves, if a conventional acoustic wave steering device is used, signal distortion is very likely to occur.

[0004] Therefore, it is necessary to provide an acoustic wave steering device for a digital sound - generating chip to steer the acoustic waves with as small distortion as possible. Summary of the Invention

[0005] The purpose of the present invention is to provide an acoustic wave steering device for a digital sound - generating chip and a smart glasses, so as to steer the acoustic waves with as small distortion as possible.

[0006] To achieve the above purpose, the present invention provides an acoustic wave steering device for a digital sound - generating chip, which is installed on the substrate of the digital sound - generating chip. The digital sound - generating chip includes an array of sound - generating units fixed on the substrate. The acoustic wave steering device includes a reflection part, and the reflection surface of the reflection part is arranged opposite to the front surface of the array of sound - generating units; the intersection line of the reflection surface of the reflection part and the front surface of the substrate is parallel to a column of the array of sound - generating units, and the distance from the coordinate point on the reflection surface of the reflection part to the array of sound - generating units changes monotonically with the distance from the coordinate point to the intersection line; and for any coordinate point on the reflection surface of the reflection part, the straight - line segment passing through this coordinate point and parallel to a column of the array of sound - generating units is located on the reflection surface of the reflection part.

[0007] The array of sound - generating units is embedded in the substrate, and the surface difference between the front surface of the array of sound - generating units and the front surface of the substrate is within 20% of the thickness of the array of sound - generating units.

[0008] The front surface of the array of sound - generating units is flush with the front surface of the substrate.

[0009] The array of sound - generating units includes a plurality of pixel sound - generating units, the pixel sound - generating units are arranged in a matrix by rows and columns, and the plurality of pixel sound - generating units in each column of the array of sound - generating units are grouped and driven as a group.

[0010] The reflecting surface of the reflecting part is a completely flat inclined surface, and the phases of the pixel sound generating units in different groups of the sound generating unit array are directly equal to the phases of the pixel sound generating units in different groups of the sound generating unit array when used for normal direction propagation; or the reflecting surface of the reflecting part is a curved surface, and the phases of the pixel sound generating units in different groups of the sound generating unit array are equal to the phases of the pixel sound generating units in different groups of the sound generating unit array when used for normal direction propagation plus the phase compensation amount corresponding to the difference in the sound wave propagation path lengths between different groups of pixel sound generating units.

[0011] The included angle between the reflecting surface of the reflecting part and the front surface of the substrate ranges from 30° to 70°; the length of one row of the sound generating unit array is L0, the projection length of the reflecting surface of the reflecting part on the substrate parallel to one row of the sound generating unit array is L, and L0 < L < 2×L0; the projection of the reflecting surface of the reflecting part on the substrate completely covers the sound generating unit array.

[0012] On both sides of the reflecting part along the direction perpendicular to one column of the sound generating unit array, there are baffles perpendicular to one column of the sound generating unit array, or it is set to be completely open.

[0013] The sound wave steering device further includes a sound guiding part, which is directly connected to the reflecting part and the opening direction is consistent with the propagation direction of the sound wave reflected by the reflecting part.

[0014] The opening direction of the sound guiding part is parallel to the front surface of the substrate and perpendicular to one column of the sound generating unit array; and / or the sound guiding part includes a part of a tubular structure or an expanding horn.

[0015] On the other hand, the present invention provides a smart glasses, which includes a digital sound generating chip vertically fixed on the frame and a sound wave steering device for the digital sound generating chip as described above. Through the sound wave steering device, the sound propagation direction points to the human ear when the smart glasses are worn.

[0016] The sound wave steering device for the digital sound generating chip of the present invention makes the intersection line of the reflecting surface of the reflecting part and the front surface of the substrate parallel to one column of the sound generating unit array, the distance from the coordinate point on the reflecting surface to the sound generating unit array monotonically changes, and the straight line segment passing through the coordinate point and parallel to one column of the sound generating unit array is located on the reflecting surface of the reflecting part, so as to minimize the distortion while realizing sound wave steering. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a sound wave steering device for a digital sound generating chip according to the first embodiment of the present invention.

[0018] Figure 2 is a schematic structural diagram of a sound wave steering device for a digital sound generating chip according to the second embodiment of the present invention.

[0019] Figure 3 It is a schematic structural diagram of smart glasses according to the third embodiment of the present invention. Detailed implementation manners

[0020] The following further describes the invention in conjunction with specific embodiments. It should be understood that the following embodiments are only used to illustrate the invention and not to limit the scope of the invention.

[0021] First embodiment: Acoustic wave steering device for digital sound generation chip

[0022] Figure 1 It is a schematic structural diagram of an acoustic wave steering device for a digital sound generation chip according to the first embodiment of the present invention.

[0023] As Figure 1 shown, the acoustic wave steering device applicable to the digital sound generation chip is installed on the substrate 11 of the digital sound generation chip 10. Among them, the digital sound generation chip 10 includes a sound generation unit array 12 fixed on the substrate 11 and a driving chip. The sound generation unit array is used to generate high-quality audio signals according to the driving signal, and the driving chip is used to generate and control the driving signal to drive the sound generation unit array of the digital sound generation chip 10 to generate sound.

[0024] The acoustic wave steering device includes a reflection part 20. The reflection surface of the reflection part is arranged opposite to the front surface of the sound generation unit array 12, and is used to reflect the acoustic waves from the digital sound generation chip 10, thereby changing the direction of the acoustic waves; and a sound guiding part 30, which is directly connected to the reflection part 20 and the opening direction is consistent with the propagation direction of the acoustic waves reflected by the reflection part 20, so as to facilitate transmitting the steered acoustic waves to the outside.

[0025] Among them, the substrate 11 is used to carry the sound generation unit array 12 and the acoustic wave steering device, and realizes the function of providing the driving signal through the driving chip. The substrate 11 can be a circuit board.

[0026] In this embodiment, the sound generation unit array 12 is embedded in the substrate 11, and the front surface of the sound generation unit array 12 is flush with the front surface of the substrate 11, so as to maximally avoid the problem of distorted acoustic waves after steering caused by unevenness. In other embodiments, the front surface of the sound generation unit array 12 and the front surface of the substrate 11 may also be uneven (that is, the front surface of the sound generation unit array 12 is higher or lower than the front surface of the substrate 11), and the surface difference between the front surface of the sound generation unit array 12 and the front surface of the substrate 11 is within 20% of the thickness of the sound generation unit array 12.

[0027] In this embodiment, the sound - emitting unit array includes a plurality of pixel sound - emitting units, and the pixel sound - emitting units are generally arranged in a matrix by rows and columns. Each pixel sound - emitting unit can adopt a CMUT (Capacitive Micromachined Ultrasonic Transducer) structure, for example, and is used to connect to a driving chip through a cable to receive a driving signal and emit sound.

[0028] The intersection line of the reflecting surface of the reflecting portion 20 and the front surface of the substrate 11 is parallel to a column of the sound - emitting unit array 12 (the column is perpendicular to Figure 1 the paper surface direction shown), and the distance from a coordinate point on the reflecting surface of the reflecting portion 20 to the sound - emitting unit array 12 monotonically changes with the distance of the coordinate point from the intersection line; and for any coordinate point on the reflecting surface of the reflecting portion 20, the straight - line segment passing through this coordinate point and parallel to a column of the sound - emitting unit array 12 is located on the reflecting surface of the reflecting portion 20. Thus, the multiple pixel sound - emitting units in each column of the sound - emitting unit array have the same sound propagation path. The multiple pixel sound - emitting units in each column of the sound - emitting unit array are grouped and driven as a group to avoid distortion.

[0029] That is to say, the straight line formed by each group of pixel sound - emitting units needs to be perpendicular to Figure 1 the paper surface direction (i.e., perpendicular to the normal of the cross - section shown in Figure 1 to be parallel to a column of the sound - emitting unit array 12), otherwise, there will be a serious distortion phenomenon.

[0030] In this embodiment, the reflecting surface of the reflecting portion 20 is a completely flat inclined surface. Therefore, the phases of different groups of pixel sound - emitting units of the sound - emitting unit array are directly equal to the phases of different groups of pixel sound - emitting units when the sound - emitting unit array is used for normal - direction propagation, which can avoid distortion between different groups of pixel sound - emitting units.

[0031] In this embodiment, the included angle range between the reflecting surface of the reflecting portion 20 and the front surface of the substrate 11 is 30° - 70°. The length of a row of the sound - emitting unit array 12 is L0, and the projection length L of the reflecting surface of the reflecting portion 20 on the substrate 11 parallel to a row of the sound - emitting unit array 12 needs to satisfy L0 < L < 2×L0. The projection of the reflecting surface of the reflecting portion 20 on the substrate 11 completely covers the sound - emitting unit array 12.

[0032] In other embodiments, the reflecting surface of the reflecting portion 20 may be a curved surface, and the curved surface also satisfies that the distance from the coordinate points thereon to the sound generating element array 12 monotonically changes with the distance from the coordinate points to the intersecting line. Therefore, the phases of the pixel sound generating elements in different groups of the sound generating element array are equal to the phases of the pixel sound generating elements in different groups when the sound generating element array is used for normal direction propagation plus the phase compensation amount corresponding to the difference in the sound wave propagation path lengths between the pixel sound generating elements in different groups. Thus, the difference in the sound wave propagation paths between the pixel sound generating elements in different groups caused by the curved reflecting surface is compensated by the phase compensation amounts of the pixel sound generating elements in different groups of the sound generating element array, and the desired sound generating effect is obtained.

[0033] In this embodiment, baffles perpendicular to a column of the sound generating element array 12 are provided on both sides of the reflecting portion 20 in the direction perpendicular to a column of the sound generating element array 12 (i.e., in the direction perpendicular to Figure 1 the paper surface). In other embodiments, both sides of the reflecting portion 20 may be set to be completely open.

[0034] In this embodiment, the opening direction of the sound guiding portion 30 is parallel to the front surface of the substrate 11 and perpendicular to a column of the sound generating element array.

[0035] In Figure 1 the first embodiment shown, the opening direction of the sound guiding portion 30 is horizontally to the right. The sound guiding portion 30 is a part of a tubular structure (the other part is blocked by the substrate 11 and thus omitted). In this embodiment, the sound guiding portion 30 may be a part of a rectangular straight tube, a circular straight tube, etc., to increase a certain sound pressure level.

[0036] Second Embodiment: Sound Wave Steering Device for Digital Sound Generating Chip

[0037] In Figure 2 the second embodiment shown, the rest of the structure is the same as that of the sound wave steering device for the digital sound generating chip in the first embodiment of the present invention, except that the sound guiding portion 30 uses a part of an expanding horn to increase the sound pressure level.

[0038] As Figure 2 shown, in this embodiment, the reflecting surface of the reflecting portion 20 is a completely flat inclined surface. The included angle α between the reflecting surface of the reflecting portion 20 and the front surface of the substrate 11 ranges from 30° to 70°. The length of a row of the sound generating element array 12 is L0, and the projected length L of the reflecting surface of the reflecting portion 20 on the substrate 11 parallel to a row of the sound generating element array 12 needs to satisfy L0 < L < 2×L0. The projection of the reflecting surface of the reflecting portion 20 on the substrate 11 completely covers the sound generating element array 12.

[0039] In addition, in some examples with lower requirements for the sound pressure level, the sound guiding portion 30 may also be omitted.

[0040] Third Embodiment: Smart Glasses

[0041] A typical application of the acoustic wave steering device for a digital sound - generating chip is smart glasses. As Figure 3 shown, according to the third embodiment of the present invention, the smart glasses include a digital sound - generating chip vertically fixed on the frame and the above - mentioned acoustic wave steering device 100 for the digital sound - generating chip. Through the acoustic wave steering device, the sound propagation direction points to the human ear when the smart glasses are worn. In this embodiment, one row of the sound - generating unit array of the digital sound - generating chip is horizontal, and the opening direction of the sound guiding part of the acoustic wave steering device is downward, so that the sound wave is turned downward and enters the human ear.

[0042] Thus, the setting position of the digital sound - generating chip is such that when the smart glasses are worn on the human ear, the digital sound - generating chip is located above the front of the human ear. Thus, through the acoustic wave steering device for the digital sound - generating chip, the sound propagation direction is turned downward so that the sound propagation direction points to the human ear.

[0043] In other embodiments, when the digital sound - generating chip is set at other positions, the opening direction of the sound guiding part is not necessarily downward, as long as the sound propagation direction points to the human ear when the smart glasses are worn through the acoustic wave steering device 100 of the present invention.

[0044] The acoustic wave steering device for the digital sound - generating chip of the present invention makes the intersection line of the reflection surface of the reflection part and the front surface of the substrate parallel to one row of the sound - generating unit array, the distance from the coordinate point on the reflection surface to the sound - generating unit array changes monotonically, and the straight - line segment passing through the coordinate point and parallel to one row of the sound - generating unit array is located on the reflection surface of the reflection part, so as to minimize distortion while realizing acoustic wave steering.

[0045] The above - mentioned are only the preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various changes can be made to the above - mentioned embodiments of the present invention. All simple, equivalent changes and modifications made according to the claims and the content of the specification of the present invention application fall within the scope of the claims of the present invention patent. What is not described in detail in the present invention is conventional technical content.

Claims

1. An acoustic wave steering device for a digital sound - generating chip, characterized in that, It is installed on the substrate of the digital sound - generating chip. The digital sound - generating chip includes an array of sound - generating units fixed on the substrate. The acoustic wave steering device includes a reflection part, and the reflecting surface of the reflection part is arranged opposite to the front surface of the array of sound - generating units. The intersection line of the reflecting surface and the front surface of the substrate is parallel to a column of the array of sound - generating units. The distance from a coordinate point on the reflecting surface to the array of sound - generating units monotonically changes with the distance of the coordinate point to the intersection line. And for any coordinate point on the reflecting surface, the straight - line segment passing through this coordinate point and parallel to a column of the array of sound - generating units is located on the reflecting surface of the reflection part.

2. The acoustic wave steering device for a digital sound generation chip according to claim 1, wherein, The array of sound - generating units is embedded in the substrate, and the surface difference between the front surface of the array of sound - generating units and the front surface of the substrate is within 20% of the thickness of the array of sound - generating units.

3. The acoustic wave steering device for a digital sound generation chip according to claim 2, wherein, The front surface of the array of sound - generating units is flush with the front surface of the substrate.

4. The acoustic wave steering device for a digital sound generation chip according to claim 1, characterized in that, The array of sound - generating units includes a plurality of pixel - based sound - generating units. The pixel - based sound - generating units are arranged in a matrix by rows and columns, and a plurality of pixel - based sound - generating units in each column of the array of sound - generating units are grouped and driven as a group.

5. The acoustic wave steering device for a digital sound generation chip according to claim 4, wherein, The reflecting surface of the reflection part is a completely flat inclined surface, and the phases of different groups of pixel - based sound - generating units of the array of sound - generating units are directly equal to the phases of different groups of pixel - based sound - generating units when the sound is propagating in the normal direction of the array of sound - generating units; or The reflecting surface of the reflection part is a curved surface, and the phases of different groups of pixel - based sound - generating units of the array of sound - generating units are equal to the phases of different groups of pixel - based sound - generating units when the sound is propagating in the normal direction of the array of sound - generating units plus the phase compensation amount corresponding to the difference in the acoustic wave propagation path lengths between different groups of pixel - based sound - generating units.

6. The acoustic wave steering device for a digital sound generating chip according to claim 1, characterized in that, The included angle between the reflecting surface of the reflection part and the front surface of the substrate ranges from 30° to 70°; The length of a row of the array of sound - generating units is L0, and the projection length of the reflecting surface of the reflection part on the substrate parallel to a row of the array of sound - generating units is L, and L0 < L < 2×L0; The projection of the reflecting surface of the reflection part on the substrate completely covers the array of sound - generating units.

7. The acoustic wave steering device for a digital sound generation chip according to claim 1, characterized in that, On both sides of the reflection part along the direction perpendicular to a column of the array of sound - generating units, there are baffles perpendicular to a column of the array of sound - generating units, or it is set to be completely open.

8. The acoustic wave steering device for a digital sound generation chip according to claim 1, characterized in that The acoustic wave steering device further includes a sound - guiding part, which is directly connected to the reflection part and the opening direction is consistent with the propagation direction of the acoustic wave reflected by the reflection part.

9. The acoustic wave steering device for a digital sound generation chip according to claim 8, wherein The opening direction of the sound - guiding part is parallel to the front surface of the substrate and perpendicular to a column of the array of sound - generating units; and / or The sound - guiding part includes a part of a tubular structure or an expanding horn.

10. An intelligent glasses, characterized in that, The smart glasses include a digital sound - generating chip vertically fixed on the frame and the acoustic wave steering device for the digital sound - generating chip according to any one of claims 1 - 9. Through the acoustic wave steering device, the sound propagation direction points to the human ear when the smart glasses are worn.

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