CN218121167U - Open type ultrasonic sensor - Google Patents

Abstract

The utility model provides an open ultrasonic sensor, its technical scheme main points are open ultrasonic sensor includes base, piezoelectric vibrator, syntonizer and pin, piezoelectric vibrator and pin install respectively in on the base, just the pin with piezoelectric vibrator electricity is connected, the syntonizer is installed and is kept away from on piezoelectric vibrator one side of base, the outline of syntonizer with form between the piezoelectric vibrator and predetermine the contained angle, just the syntonizer with distribution has the adhesive in piezoelectric vibrator's the connection is in contained angle between them. Through adopting the syntonizer to improve the directive property of sensor, distribute the adhesive moreover between the contained angle of syntonizer and piezoelectric vibrator, can make the control of adhesive tie area in certain extent, improve the uniformity of impedance to improve the uniformity of frequency response, realize the high sound pressure when sensor array uses.

Description

Open type ultrasonic sensor

Technical Field

The utility model relates to an ultrasonic sensor field especially relates to an open ultrasonic sensor.

Background

The directional ultrasonic sound sensor of audio frequency is a device capable of producing high directional audible sound, and the device emits ultrasonic carrier wave with a certain difference frequency signal into the air, when the ultrasonic carrier wave is propagated in the air, two lines of ultrasonic carrier wave signals produce nonlinear interaction, so that the self-demodulation produces low-frequency audible sound, and the low-frequency audible sound is propagated to a listener in a high directional mode. With the continuous progress of society, more and more occasions require ultrasonic sensors with high directivity, and various sensors appear on the market, but the following problems generally exist, so that the products cannot be used in an array mode: 1. the impedance consistency of the existing sensor is poor; 2. the existing product is easy to generate scream and noise during working; 3. within a certain range, the frequency response consistency is poor, so that the sound pressure level of the product is low when the array is used, and the sound emitted by the sound frequency directional equipment is small.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an impedance uniformity is good, the open ultrasonic sensor that the frequency response uniformity is good.

In order to achieve the above object, the present invention provides the following technical solutions:

the utility model provides an open ultrasonic sensor, includes base, piezoelectricity oscillator, syntonizer and pin, piezoelectricity oscillator and pin install respectively in on the base, just the pin with piezoelectricity oscillator electricity is connected, the syntonizer is installed and is kept away from on the piezoelectricity oscillator one side of base, the outline of syntonizer with form the predetermined contained angle between the piezoelectricity oscillator, just the syntonizer with distribution has the adhesive in the contained angle between them is in being connected of piezoelectricity oscillator.

Further setting: the adhesive is uniformly distributed around the resonator and connected between the resonator and the piezoelectric vibrator.

Further setting: the resonator is conical and the outer diameter of the cross section of the resonator is gradually reduced along the direction close to the piezoelectric vibrator.

Further setting: the maximum outer diameter of the resonator is in the range of 6mm to 6.8 mm.

Further setting: the thickness of the resonator is in the range of 0.1mm to 0.14 mm.

Further setting: the outer contour of the resonator and the piezoelectric vibrator form an included angle within the range of 15-22 degrees.

Further setting: the ratio of the maximum outer diameter of the resonator to the diameter of the piezoelectric vibrator is in the range of 0.8 to 0.9.

Further setting: the adhesive is formed by mixing epoxy resin and polyamine resin.

Further setting: the pins are provided with a pair of pins which penetrate through the base, and connecting wires are connected between the pins and the piezoelectric vibrators.

Further setting: the resonator comprises a conical surface side wall and a plane bottom wall, the bottom of the conical surface side wall is connected with the periphery of the plane bottom wall, the conical surface side wall and the plane bottom wall jointly define a horn-shaped opening, and the plane bottom wall is attached to the surface of the piezoelectric vibrator.

Compared with the prior art, the utility model discloses a scheme has following advantage:

the utility model relates to an among the open ultrasonic sensor, through the syntonizer that adopts the coniform face, the ultrasonic wave that makes the sensor produce radiates at the certain limit, improves the directive property of sensor, distributes the bonding agent moreover between syntonizer and piezoelectric vibrator's contained angle, can make bonding agent constraint area control in the certain limit, makes the impedance distribution of sensor in the certain limit, improves the uniformity of impedance to improve the uniformity of frequency response, realize the high acoustic pressure when sensor array uses. In addition, the adhesive improves the bonding force between the resonator and the piezoelectric vibrator, can bear the impact of larger power, and has certain toughness after the adhesive is cured, thereby avoiding screaming at the position of constraint and ensuring that the sound quality of the sensor is better when the sensor is used as a sound production component.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an open ultrasonic sensor according to an embodiment of the present invention.

Reference numerals: 1. a base; 11. a support pillar; 2. a piezoelectric vibrator; 3. a resonator; 31. a conical side wall; 32. a planar bottom wall; 4. a pin; 5. an adhesive; 6. and connecting the wires.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.

As shown in fig. 1, the utility model provides an open ultrasonic sensor has higher impedance uniformity and frequency response uniformity to can be used for audio frequency directional system, it includes base 1, piezoelectric vibrator 2, syntonizer 3 and pin 4, piezoelectric vibrator 2 and pin 4 install respectively in on the base 1, just pin 4 with piezoelectric vibrator 2 electricity is connected, syntonizer 3 is installed and is kept away from on piezoelectric vibrator 2 one side of base 1, syntonizer 3's outline with it predetermines the contained angle to form between the piezoelectric vibrator 2, just syntonizer 3 with distribution has adhesive 5 in piezoelectric vibrator 2's the connection is in contained angle between them.

By adopting the conical resonator 3, ultrasonic waves generated by the sensor are radiated in a certain range, the directivity of the sensor is improved, and the adhesive 5 is distributed between the resonator 3 and the piezoelectric vibrator 2, so that the bound area of the adhesive 5 can be controlled in a certain range, the impedance of the sensor is distributed in a certain range, the consistency of the impedance is improved, the consistency of frequency response is improved, and high sound pressure is realized when the sensor array is used; the uniformity of the phase of the sensor can be realized while the uniformity of the impedance is improved. In addition, the adhesive 5 improves the adhesion force between the resonator 3 and the piezoelectric vibrator 2, can bear the impact of larger power, and has certain toughness after the adhesive 5 is cured, thereby avoiding scream at a constraint position and ensuring better tone quality when the sensor is used as a sounding component.

In the present embodiment, the resonator 3 has a conical shape and the outer diameter of the cross section thereof gradually decreases in the direction toward the piezoelectric vibrator 2. Specifically, the resonator 3 includes a conical surface side wall 31 and a planar bottom wall 32, the bottom of the conical surface side wall 31 is connected to the periphery of the planar bottom wall 32, the conical surface side wall 31 and the planar bottom wall 32 jointly define a horn-shaped opening, and the planar bottom wall 32 is attached to the surface of the piezoelectric vibrator 2.

By designing the resonator 3 into a conical surface-shaped structure, the resonator 3 is provided with a horn-shaped opening, after the piezoelectric vibrator 2 vibrates to generate ultrasonic waves, the ultrasonic waves are transmitted outwards through the resonator 3, and the horn-shaped opening of the resonator 3 can enable the ultrasonic waves to radiate within a certain included angle range, control the pointing angle of the sensor to be 40-60 degrees (-6 dB), and improve the directivity of the sensor. In addition, the resonator 3 is attached to the piezoelectric vibrator 2 through the plane bottom wall 32, so that the resonator 3 and the piezoelectric vibrator 2 are conveniently adhered to each other, the structural stability is higher after the two are adhered to each other, and the stability of the electrical performance of the sensor is improved.

In the present embodiment, the adhesive 5 is uniformly distributed around the resonator 3 and connected between the resonator 3 and the piezoelectric vibrator 2. In other embodiments, the adhesive 5 may be distributed in a dot pattern at intervals along the circumferential direction of the resonator 3.

Through surrounding 3 periphery evenly distributed in syntonizers 3 in the bottom outside with adhesive 5, adhesive 5 bonds 3 with syntonizers with piezoelectric vibrator 2 fixedly, has improved syntonizer 3 and piezoelectric vibrator 2's reliability of being connected, and syntonizer 3 takes place the pine with piezoelectric vibrator 2 is difficult to take place to take off the deformation to further improve the tone quality stability when the sensor is as the sound producing component.

In this embodiment, the pins 4 are provided with a pair of pins 4, the pins 4 penetrate through the base 1, the connection lines 6 are connected between the pins 4 and the piezoelectric vibrator 2, specifically, the two pins 4 are respectively connected with the positive electrode and the negative electrode of the piezoelectric vibrator 2 through the connection lines 6, and the two pins 4 are used for being connected with an external power supply. The piezoelectric vibrator 2 is powered through the pin 4 and the connecting wire 6, so that the piezoelectric vibrator 2 vibrates to generate ultrasonic waves, and self-demodulation is carried out under the action of the resonator 3 to generate low-frequency audible sound.

In this embodiment, one side of the base 1 close to the piezoelectric vibrator 2 protrudes to form a supporting column 11, the piezoelectric vibrator 2 is installed on the supporting column 11, and the distance between the connection positions of the piezoelectric vibrator 2 and the pin 4 on the base 1 is increased through the supporting column 11, so that the influence on the pin 4 when the piezoelectric vibrator 2 vibrates is reduced.

In the embodiment, the maximum outer diameter of the resonator 3 is in a range of 6mm to 6.8mm, that is, the outer diameter of the top of the resonator 3 is 6mm to 6.8mm, the thickness of the resonator 3 is in a range of 0.1mm to 0.14mm, the ratio of the maximum outer diameter of the resonator 3 to the diameter of the piezoelectric vibrator 2 is controlled in a range of 0.8 to 0.9, and the included angle between the outer wheel profile of the resonator 3 and the piezoelectric vibrator 2 is in a range of 15 ° to 22 °, that is, the included angle between the conical side wall 31 of the resonator 3 and the side surface of the piezoelectric vibrator 2 close to the resonator 3 is 15 ° to 22 °.

By adopting the resonator 3 with the size and controlling the included angle between the outer contour of the resonator 3 and the piezoelectric vibrator 2 to be a preset value, the pointing angle of the sensor is reduced to 40-60 degrees (-6 dB), the directivity of the sensor is improved, and by adopting the resonator 3 with the size, when the sensor is applied to an audio frequency directional system and distributed in an array manner, the interference between adjacent sensors is small, the space occupied by the array distribution of the sensor can be reduced, and the overall size of the audio frequency directional system is favorably reduced.

Further, the adhesive 5 is formed by mixing an epoxy resin and a polyamine resin. Preferably, the adhesive 5 is formed by mixing two or more high-temperature-resistant epoxy resins and polyamine resins, the viscosity of each component is 10000-20000mPa.s (cP), the hardness of the cured adhesive is 70-140 shoreA through a reasonable process, and the cured adhesive is hard and tough.

By using the adhesive 5, the resonator 3 and the piezoelectric vibrator 2 are bonded with good adhesion, and can withstand a large power impact. And secondly, the adhesive 5 has good toughness after being cured, so that screaming at a constraint position is avoided, and the sound quality of the sensor is better when the sensor is used as a sounding component. Moreover, the adhesive 5 can reduce the yield deformation of the material under continuous pressure, reduce the change range of the resonant frequency of the sensor and improve the frequency response consistency of the sensor.

To sum up, the utility model discloses a scheme has following advantage:

the utility model relates to an among the open ultrasonic sensor, through adopting coniform syntonizer 3, the ultrasonic wave that makes the sensor produce radiates at the certain limit, improves the directive property of sensor, and distribution adhesive 5 between syntonizer 3 and piezoelectric vibrator 2's contained angle moreover can make 5 constraint area control of adhesive in the certain limit, makes the impedance distribution of sensor in the certain limit, improves the uniformity of impedance to improve the uniformity of frequency response, realize the high acoustic pressure when sensor array uses. In addition, the adhesive 5 improves the adhesion force between the resonator 3 and the piezoelectric vibrator 2, can bear the impact of larger power, and has certain toughness after the adhesive 5 is cured, thereby avoiding scream at a constraint position and ensuring better tone quality when the sensor is used as a sounding component.

The foregoing is only a part of the embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. An open ultrasonic sensor, characterized by: including base, piezoelectricity oscillator, syntonizer and pin, piezoelectricity oscillator and pin install respectively in on the base, just the pin with piezoelectricity oscillator electricity is connected, the syntonizer is installed and is kept away from on the piezoelectricity oscillator one side of base, the outline of syntonizer with form between the piezoelectricity oscillator and predetermine the contained angle, just the syntonizer with distribution has the adhesive in the contained angle that the connection of piezoelectricity oscillator is in both.

2. The open ultrasonic sensor of claim 1, wherein: the adhesive is uniformly distributed around the resonator and connected between the resonator and the piezoelectric vibrator.

3. The open ultrasonic sensor of claim 1, wherein: the resonator is conical and the outer diameter of the cross section of the resonator is gradually reduced along the direction close to the piezoelectric vibrator.

4. The open ultrasonic sensor of claim 3, wherein: the maximum outer diameter of the resonator is in the range of 6mm to 6.8 mm.

5. The open ultrasonic sensor of claim 3, wherein: the thickness of the resonator is in the range of 0.1mm to 0.14 mm.

6. The open ultrasonic sensor of claim 3, wherein: the outer contour of the resonator and the piezoelectric vibrator form an included angle within the range of 15-22 degrees.

7. The open ultrasonic sensor of claim 1, wherein: the ratio of the maximum outer diameter of the resonator to the diameter of the piezoelectric vibrator is in the range of 0.8 to 0.9.

8. The open ultrasonic sensor of claim 1, wherein: the adhesive is formed by mixing epoxy resin and polyamine resin.

9. The open ultrasonic sensor according to claim 1, wherein: the pin is provided with a pair of pins, the pins penetrate through the base, and a connecting wire is connected between the pins and the piezoelectric vibrator.

10. The open ultrasonic sensor according to claim 1, wherein: the resonator comprises a conical surface side wall and a plane bottom wall, the bottom of the conical surface side wall is connected with the periphery of the plane bottom wall, the conical surface side wall and the plane bottom wall jointly define a horn-shaped opening, and the plane bottom wall is attached to the surface of the piezoelectric vibrator.

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