Close-range ultrasonic sensing device and close-range ultrasonic sensing system using same

Abstract

A short-distance ultrasonic sensing device comprises a microprocessor and an ultrasonic sensing assembly. The microprocessor generates a control signal, and the ultrasonic sensing assembly comprises a booster circuit, an ultrasonic transmitting module, an ultrasonic receiving module and an amplifying circuit. The boost control signal of the boost circuit is a driving signal. The ultrasonic transmitting module receives the driving signal to generate and transmit an ultrasonic signal. The ultrasonic receiving module receives reflection of the ultrasonic signal and converts the reflection into a reflection signal, and the transmitting / receiving angle of the ultrasonic transmitting module and the ultrasonic receiving module is 2-10 degrees. The amplifying circuit receives the reflected signal and amplifies the reflected signal into a sensing signal. The microprocessor generates a sensing result according to the sensing signal. The frequency of the ultrasonic signal and the ultrasonic reflection signal is 500 KHz to 1.2 MHz. And the sensing distance of the ultrasonic sensing assembly is 0.2 to 8 centimeters.

Description

Technical Field

[0001] The present invention relates to the field of circuit board sensing, and in particular to a short-range ultrasonic sensing device and a short-range ultrasonic sensing system using the same. Background Art

[0002] There are many ways to detect objects, such as using light passing / blocking, reflection / absorption, magnetic induction, etc. to achieve confirmation or identification. In optical identification, traditional barcodes (Barcode) and two-dimensional barcodes (QRcode) are mainly through optical scanners using their own light source to illuminate the barcode, and then using photoelectric converters to receive the reflected light and convert the brightness of the reflected light into digital signals.

[0003] However, the use of barcodes is relatively limited in narrow spaces or objects whose materials are highly reflective or highly penetrable.

[0004] In terms of magnetic induction, near field communication, such as radio frequency tags (RFID), can be used for sensing, which has a wider range of applications. However, compared with traditional barcodes, RFID requires the installation of antennas and chips, and the overall cost is more expensive. Summary of the invention

[0005] In order to solve the problems faced by the prior art, a short-range ultrasonic sensing device is provided. The short-range ultrasonic sensing device includes a microprocessor and an ultrasonic sensing assembly. The microprocessor generates a control signal and sends it out, and the ultrasonic sensing assembly includes a boost circuit, an ultrasonic transmitting module, an ultrasonic receiving module, and an amplifier circuit. The boost circuit is electrically connected to the microprocessor, receives the control signal, and boosts the control signal into a driving signal. The ultrasonic transmitting module is electrically connected to the boost circuit, receives the driving signal, generates an ultrasonic signal and sends it out. The emission angle of the ultrasonic transmitting module is 2 to 10 degrees. The ultrasonic receiving module receives the ultrasonic reflection signal generated by the reflection of the ultrasonic signal, converts it into a reflection signal and sends it out, and the receiving angle of the ultrasonic receiving module is 2 to 10 degrees. The amplifier circuit is electrically connected to the ultrasonic receiving module and the microprocessor, receives the reflection signal, amplifies it into a sensing signal, and then transmits it to the microprocessor. The microprocessor generates a sensing result based on the sensing signal. The frequency of the ultrasonic signal and the ultrasonic reflection signal is 500KHz to 1.2MHz. The sensing distance of the ultrasonic sensing assembly is 0.2 to 8 centimeters.

[0006] In some embodiments, the ultrasonic transmitting module, the ultrasonic receiving module, the boosting circuit and the amplifying circuit are packaged into the same chip.

[0007] In some embodiments, the ultrasonic transmitting module and the ultrasonic receiving module include at least a piezoelectric ultrasonic transducer (PMUT).

[0008] Preferably, in some embodiments, the ultrasonic transmitting module and the ultrasonic receiving module respectively include a plurality of piezoelectric ultrasonic sensors, and the piezoelectric ultrasonic sensors are arranged in an array.

[0009] In some embodiments, the frequencies of the ultrasonic signal and the ultrasonic reflection signal are 600 KHz to 800 MHz, the transmitting angle and the receiving angle are 3 to 5 degrees, and the sensing distance of the ultrasonic sensing assembly is 0.3 to 3 centimeters.

[0010] Here, a short-range ultrasonic sensing system is also provided. The short-range ultrasonic sensing system includes a short-range ultrasonic sensing device, an object to be sensed, a database and a central processing unit. The short-range ultrasonic sensing device includes a microprocessor and an ultrasonic sensing assembly. The microprocessor generates a control signal and sends it out, and the ultrasonic sensing assembly includes a boost circuit, an ultrasonic transmitting module, an ultrasonic receiving module, and an amplifier circuit. The boost circuit is electrically connected to the microprocessor, receives the control signal, and boosts the control signal into a drive signal. The ultrasonic transmitting module is electrically connected to the boost circuit, receives the drive signal, generates an ultrasonic signal and sends it out. The emission angle of the ultrasonic transmitting module is 2 to 10 degrees. The ultrasonic receiving module receives the ultrasonic reflection signal generated by the reflection of the ultrasonic signal and converts it into a reflection signal and sends it out. The receiving angle of the ultrasonic receiving module is 2 to 10 degrees. The amplifier circuit is electrically connected to the ultrasonic receiving module and the microprocessor, receives the reflection signal, amplifies it into a sensing signal, and then transmits it to the microprocessor. The microprocessor generates a sensing result based on the sensing signal. The frequency of the ultrasonic signal and the ultrasonic reflection is 500KHz to 1.2MHz.

[0011] The object to be sensed is provided with a sensing tag, which includes a wave attenuation part and a wave reflection part. When the ultrasonic signal is reflected by the sensing tag, an ultrasonic reflection signal is generated, wherein the sensing distance between the close-range ultrasonic sensing device and the object to be sensed is 0.2 to 8 cm. The central processing unit activates the microprocessor to generate a control signal according to the operation instruction, and accesses the data in the database for comparison according to the sensing result of the close-range ultrasonic sensing device.

[0012] In some embodiments, the ultrasonic transmitting module and the ultrasonic receiving module include at least a piezoelectric ultrasonic transducer (PMUT).

[0013] Preferably, in some embodiments, the ultrasonic transmitting module and the ultrasonic receiving module respectively include a plurality of piezoelectric ultrasonic sensors, and the piezoelectric ultrasonic sensors are arranged in an array.

[0014] In some embodiments, the frequencies of the ultrasonic signal and the ultrasonic reflection signal are 600 KHz to 800 MHz, the transmitting angle and the receiving angle are 3 to 5 degrees, and the sensing distance of the ultrasonic sensing assembly is 0.3 to 3 centimeters.

[0015] In some embodiments, the wave attenuating portion of the sensing portion is a wave attenuating coating, a wave scattering coating, or a wave absorbing material.

[0016] As shown in the aforementioned embodiments, by setting the frequency, transmission angle and receiving angle of the ultrasonic signal and the ultrasonic reflection signal within a specific range, the ultrasonic sensing assembly can have high directivity and be suitable for operation in close proximity, low light, or light-transmitting environments, thereby reducing conditions that are traditionally undetectable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 4 is a block diagram of a short-range ultrasonic sensing device.

[0018] Figure 2 Figure 2 is a block diagram of a close-range ultrasonic sensing system.

[0019] Figure 3 Schematic diagram of a sensing tag.

[0020] Figures 4 to 6 Schematic diagrams of different application embodiments of a close-range ultrasonic sensing system.

[0021] Description of reference numerals:

[0022] 100: close range ultrasonic sensing system;

[0023] 1: Close range ultrasonic sensing device;

[0024] 10: microprocessor;

[0025] 20: Ultrasonic sensor assembly;

[0026] 21: boost circuit;

[0027] 23: Ultrasonic emission module;

[0028] 235: piezoelectric ultrasonic sensor;

[0029] 25: ultrasonic receiving module;

[0030] 255: piezoelectric ultrasonic sensor;

[0031] 27: amplifier circuit;

[0032] 3: Object to be sensed;

[0033] 31: sensing tag;

[0034] 311: wave attenuation part;

[0035] 313: wave reflection part;

[0036] 5: Database;

[0037] 7: CPU;

[0038] A: Operation instructions;

[0039] C: control signal;

[0040] D: driving signal;

[0041] E: actuation signal;

[0042] R: reflected signal;

[0043] Rt: sensing result;

[0044] S: sensing signal;

[0045] Ut: ultrasonic signal;

[0046] Ur: Ultrasonic reflection signal. DETAILED DESCRIPTION

[0047] It should be understood that when a component is referred to as being "disposed" on another component, it may mean that the component is directly located on the other component, or there may be an intermediate component through which the component and the other component are connected. Conversely, when a component is referred to as being "directly disposed on another component" or "directly disposed to another component", it should be understood that it is clearly defined that there are no intermediate components.

[0048] Figure 1 FIG. 1 is a block diagram of a short-range ultrasonic sensing device. Figure 1As shown, the short-range ultrasonic sensing device 1 includes a microprocessor 10 and an ultrasonic sensing assembly 20. The microprocessor 10 generates a control signal C and sends it out. The ultrasonic sensing assembly 20 includes a boost circuit 21, an ultrasonic transmitting module 23, an ultrasonic receiving module 25, and an amplifier circuit 27. The boost circuit 21 is electrically connected to the microprocessor 10, receives the control signal C, and boosts the control signal C to a drive signal D. The ultrasonic transmitting module 23 is electrically connected to the boost circuit 21, receives the drive signal D, generates an ultrasonic signal Ut and sends it out. The emission angle of the ultrasonic transmitting module 23 is 2 to 10 degrees. The ultrasonic receiving module 25 receives the ultrasonic reflection signal Ur generated by the reflection of the ultrasonic signal Ut, and converts it into a reflection signal R and sends it out. The receiving angle of the ultrasonic receiving module 25 is 2 to 10 degrees. Here, the ultrasonic reflection signal Ur is mainly converted into an electrical signal. The amplifier circuit 27 is electrically connected to the ultrasonic receiving module 25 and the microprocessor 10, receives the reflection signal R, and amplifies it into a sensing signal S, and then transmits it to the microprocessor 10. The microprocessor 10 generates a sensing result Rt according to the sensing signal S.

[0049] The frequency of the ultrasonic signal Ut and the ultrasonic reflection signal Ur is 500KHz to 1.2MHz. The sensing distance of the ultrasonic sensing assembly 20 is 0.2 to 8cm. Preferably, in some embodiments, the frequency of the ultrasonic signal Ut and the ultrasonic reflection signal Ur is 600KHz to 800MHz, the transmission angle and the receiving angle are 3 to 5 degrees, and the sensing distance of the ultrasonic sensing assembly 20 is 0.3 to 3cm.

[0050] In the prior art, ultrasonic sensing devices are used not only for fingerprint sensing, but also for vehicle distance sensing. However, it is usually considered that the distance between 1 and 5 centimeters is the blind spot of ultrasonic sensing devices. However, by limiting the frequency of ultrasonic waves to 600KHz to 800MHz, and limiting the transmission angle and receiving angle to 3 to 5 degrees, it is possible to effectively perform close-range sensing.

[0051] In some embodiments, the ultrasonic transmitting module 23, the ultrasonic receiving module 25, the boosting circuit 21 and the amplifying circuit 27 are packaged into the same chip. However, this is only an example of miniaturization and is not intended to be limiting. For example, the ultrasonic transmitting module 23 and the boosting circuit 21 may be packaged into a chip, while the ultrasonic receiving module 25 and the amplifying circuit 27 may be packaged into another chip.

[0052] See again Figure 1In some embodiments, the ultrasonic transmitting module 23 and the ultrasonic receiving module 25 may include at least piezoelectric ultrasonic sensors 235 and 255. Although two piezoelectric ultrasonic sensors 235 and 255 are used as examples, and the piezoelectric ultrasonic sensors 235 and 255 are arranged in an array, the actual number or configuration can be adjusted according to the actual needs of the product.

[0053] Figure 2 Figure 1 is a block diagram of a short-range ultrasonic sensing system. Figure 2 As shown, a short-range ultrasonic sensing system 100 is also provided. The short-range ultrasonic sensing system 100 comprises a short-range ultrasonic sensing device 1, an object to be sensed 3, a database 5 and a central processing unit 7. The detailed structure of the short-range ultrasonic sensing device 1 can be referred to Figure 1 The CPU 7 sends an actuation signal E according to the operation instruction A to actuate the microprocessor 10 to generate a control signal C. The object to be sensed 3 is provided with a sensing tag 31, which includes a wave attenuation part 311 and a wave reflection part 313 (see Figure 3 ), when the ultrasonic signal Ut emitted by the ultrasonic transmitting module 23 is reflected by the sensing tag 31, an ultrasonic reflection signal Ur is generated, and the ultrasonic receiving module 25 can form reflection intensities of different blocks in the ultrasonic reflection signal Ur for the wave attenuation part 311 and the wave reflection part 313, and translate the reflection intensity into a digital reflection signal. The central processing unit 7 accesses the data in the database 5 and compares it according to the sensing result Rt of the short-range ultrasonic sensing device 1, and then identifies the object to be sensed 3, or executes a corresponding operation command according to the analysis of the object to be sensed 3. Here, the sensing distance between the short-range ultrasonic sensing device 1 and the object to be sensed 3 is 0.2 to 8 cm.

[0054] Figure 3 Schematic diagram of a sensing tag. Figure 3 A general barcode is used as the sensing tag 31, but this is only an example and not a limitation. In fact, it can also be presented in the form of a QR code. Figure 3 As shown, the barcode-type sensing label 31 is printed with a wave attenuation part 311 and a wave reflection part 313. The purpose of the wave attenuation part 311 is to significantly attenuate the intensity of the ultrasonic reflection signal Ur corresponding to this area. Wave absorbing materials, such as cloth, wool, sponge, or wave attenuation coating, reflective material can be used to reduce the intensity of the ultrasonic signal Ut when it contacts, or reflect it to an angle that exceeds the receivable angle of the ultrasonic receiving module 25. The material of the sensing label 31 can be selected in accordance with the object to be sensed 3.

[0055] Figures 4 to 6Schematic diagrams of different application embodiments of the short-range ultrasonic sensing system. The following will introduce the application of the short-range ultrasonic sensing system 100 in different implementation modes. Figure 4 As shown, the short-range ultrasonic sensing system 100 can be applied to the hotel's door card recharging system. The object to be sensed 3 is a room card. The traditional recharging system is to perform recharging by induction after the room card shields the light. For convenience, many travelers may use their own ID cards and credit cards to maintain recharging after going out. This not only causes energy waste in the hotel, but also many ID cards are lost in practice. In this regard, a sensing tag 31 can be set on the room card, and in the corresponding measurement design, recharging is performed only after the sensing is identified as a room card.

[0056] Figure 5 It can be the sensing of the store. The short-range ultrasonic sensing device 1 can be installed on the sensing pen, and the sensing tag 31 can be installed on the object in the store, such as a plush toy. The sensing tag 31 can have different categories according to the object, and can be used for transparent or light-absorbing objects.

[0057] Figure 6 It can be applied to toys or the catering industry, for example, the rotating plate of conveyor belt sushi. The short-range ultrasonic sensing device 1 can be installed on the bottom of a dynamic toy, and the sensing tag 31 can be transparent. When the short-range ultrasonic sensing device 1 reads the sensing tag 31, it can generate changes in light, color or sound according to the corresponding instructions on the sensing tag 31.

[0058] In summary, by setting the frequency, transmission angle and receiving angle of the ultrasonic signal Ut and the ultrasonic reflection signal Ur within a specific range, the short-range ultrasonic sensing device 1 can have high directivity and is suitable for operation in a short-range, low-light or light-transmitting environment, thereby reducing conditions that are traditionally undetectable.

[0059] Although the technical contents of the present invention have been disclosed as above by the preferred embodiments, they are not used to limit the present invention. Any changes and modifications made by anyone skilled in the art without departing from the spirit of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be based on the scope defined by the attached patent application.

Claims

1. A short-range ultrasonic sensing device, characterized in that: Include: A microprocessor generates and sends control signals; and Ultrasonic sensor assembly, including: A boost circuit, electrically connected to the microprocessor, receives the control signal, and boosts the control signal into a drive signal; An ultrasonic transmitting module, electrically connected to the boost circuit, receives the driving signal, generates an ultrasonic signal and sends it out, wherein the transmitting angle of the ultrasonic transmitting module is 2 to 10 degrees; an ultrasonic receiving module, which receives an ultrasonic reflected signal generated by the ultrasonic signal being reflected and converts it into a reflected signal and sends it out, wherein the receiving angle of the ultrasonic receiving module is 2 to 10 degrees; and an amplifying circuit, electrically connected to the ultrasonic receiving module and the microprocessor, receiving the reflected signal, amplifying the reflected signal into a sensing signal, and then transmitting the amplified signal to the microprocessor, wherein the microprocessor generates a sensing result according to the sensing signal; The frequencies of the ultrasonic signal and the ultrasonic reflection signal are 500 KHz to 1.2 MHz, and the sensing distance of the ultrasonic sensing assembly is 0.2 to 8 centimeters.

2. The short-range ultrasonic sensing device according to claim 1, wherein: The ultrasonic transmitting module, the ultrasonic receiving module, the boost circuit and the amplifier circuit are packaged into the same chip.

3. The short-range ultrasonic sensing device as claimed in claim 2, characterized in that: The ultrasonic transmitting module and the ultrasonic receiving module include at least a piezoelectric ultrasonic sensor.

4. The short-range ultrasonic sensing device as claimed in claim 3, characterized in that: The ultrasonic transmitting module and the ultrasonic receiving module respectively include a plurality of piezoelectric ultrasonic sensors, and the piezoelectric ultrasonic sensors are arranged in an array.

5. The short-range ultrasonic sensing device as claimed in claim 1, wherein: The frequencies of the ultrasonic signal and the ultrasonic reflection signal are 600 KHz to 800 MHz, the emission angle and the receiving angle are 3 to 5 degrees, and the sensing distance of the ultrasonic sensing assembly is 0.3 to 3 centimeters.

6. A short-range ultrasonic sensing system, characterized in that: Include: A short-range ultrasonic sensing device comprises a microprocessor and an ultrasonic sensing assembly, wherein the microprocessor generates a control signal and sends it out, and the ultrasonic sensing assembly comprises a boost circuit, an ultrasonic transmitting module, an ultrasonic receiving module, and an amplifier circuit, wherein the boost circuit is electrically connected to the microprocessor, receives the control signal, and boosts the control signal into a driving signal; the ultrasonic transmitting module is electrically connected to the boost circuit, receives the driving signal, generates an ultrasonic signal and sends it out, and a transmission angle of the ultrasonic transmitting module is 2 to 10 degrees; the ultrasonic receiving module receives an ultrasonic reflection signal generated by the reflection of the ultrasonic signal and converts it into a reflection signal and sends it out, and the receiving angle of the ultrasonic receiving module is 2 to 10 degrees; the amplifier circuit is electrically connected to the ultrasonic receiving module and the microprocessor, receives the reflection signal, amplifies it into a sensing signal, and then transmits it to the microprocessor, and the microprocessor generates a sensing result according to the sensing signal; wherein the frequency of the ultrasonic signal and the ultrasonic reflection signal is 500KHz to 1.2MHz; The object to be sensed is provided with a sensing tag, the sensing tag comprises a wave attenuation part and a wave reflection part, when the ultrasonic signal is reflected by the sensing tag, the ultrasonic reflection signal is generated, wherein the sensing distance between the close-range ultrasonic sensing device and the object to be sensed is 0.2 to 8 cm; database; as well as The central processing unit activates the microprocessor to generate the control signal according to the operation instruction, and accesses the data in the database for comparison according to the sensing result of the close-range ultrasonic sensing device.

7. The short-range ultrasonic sensing system according to claim 6, wherein: The ultrasonic transmitting module and the ultrasonic receiving module include at least a piezoelectric ultrasonic sensor.

8. The short-range ultrasonic sensing system according to claim 7, wherein: The ultrasonic transmitting module and the ultrasonic receiving module respectively include a plurality of piezoelectric ultrasonic sensors, and the piezoelectric ultrasonic sensors are arranged in an array.

9. The short-range ultrasonic sensing system according to claim 6, wherein: The frequencies of the ultrasonic signal and the ultrasonic reflection signal are 600 KHz to 800 MHz, the emission angle and the receiving angle are 3 to 5 degrees, and the sensing distance of the ultrasonic sensing assembly is 0.3 to 3 centimeters.

10. The short-range ultrasonic sensing system according to claim 6, wherein: The wave attenuating portion of the label is a wave attenuating coating, a wave scattering coating, or a wave absorbing material.

Images