CN211132018U - Two-dimensional ultrasonic blind guiding stick based on current lattice stimulation - Google Patents
Two-dimensional ultrasonic blind guiding stick based on current lattice stimulation Download PDFInfo
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- CN211132018U CN211132018U CN201920669864.0U CN201920669864U CN211132018U CN 211132018 U CN211132018 U CN 211132018U CN 201920669864 U CN201920669864 U CN 201920669864U CN 211132018 U CN211132018 U CN 211132018U
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Abstract
The utility model discloses a two-dimentional supersound guide cane based on current dot matrix is amazing, including guide cane body and the stimulation electrode dot matrix of setting on the guide cane body, a control circuit includes the singlechip, signal converter, a plurality of ultrasonic ranging module, a plurality of pulse distributor, stimulation current generator includes a plurality of drive circuit, DC-DC boost module, constant current controller, singlechip output passes through signal converter and a plurality of ultrasonic ranging module electric connection, the singlechip output still is connected with a plurality of pulse distributor input, a plurality of drive circuit are connected respectively to a plurality of pulse distributor output, DC-DC boost module output is all connected to a plurality of drive circuit, every drive circuit output is connected stimulation electrode input with the constant current controller output. The utility model discloses the detection scope enlarges, makes the blind person perceive the two-dimensional distribution of barrier in the certain limit, can survey the moving target.
Description
Technical Field
The utility model relates to the technical field of medical equipment, especially, relate to a two-dimensional supersound guide blind stick based on current lattice is amazing.
Background
The blind guiding stick is used for helping the blind person go out to explore obstacles on the ground a little far ahead, is usually a simple stick in the past, and in recent years, an electronic blind guiding stick appears. The electronic blind guiding stick adopts the ultrasonic ranging principle more. The method utilizes the characteristic that the ultrasonic wave can generate a reflected wave when meeting an obstacle and the propagation speed of the ultrasonic wave in the air is basically unchanged. The distance to the obstacle can be calculated by measuring the time from the moment when the ultrasonic wave is transmitted to the moment when the ultrasonic wave meets the obstacle and the reflected wave generated by the obstacle returns to the original transmitting point. Ultrasonic ranging circuits that transmit, receive, and generate the propagation time of the echo of an obstacle have been modular in nature. Most of electronic blind guiding sticks measure the distance of an obstacle by using an ultrasonic ranging module and then prompt in modes of vibration, voice and the like so as to play a role in guiding blind. However, these products can only provide information about roadblocks in a single direction, and the detection field of view is narrow.
The electronic blind guiding stick product also uses a miniature camera to shoot, obtains image characteristics through image analysis software, and then uses voice to describe and remind. The language, however, describes only some characteristic information of the environment and is not intuitive and concrete.
Human sensory organs are visual, auditory, tactile, olfactory, taste, cold and hot, etc., of which the amount of information visually received is the largest. The vision can perceive the two-dimensional outline information of the object, and the light, shade and color information. When vision is impaired, there is no other sensory organ that can completely replace the visual function. Among other sensations, only the tactile sensation and the cold and heat sensation appear two-dimensionally distributed on the human body. Particularly useful is the sense of touch, which is very sensitive and delicate in some parts of the human body. By means of a certain method, the blind can sense two-dimensional information through touch sense, and therefore the two-dimensional information sensing function of vision is partially replaced.
Among various tactile representation methods, the tactile sensation generated by electrical stimulation is widely concerned by researchers due to the characteristics of flexible stimulation, simple implementation device, accurate and controllable pulse parameters and the like. The electric touch sense is a principle of simulating a skin receptor to generate a sensing potential for physical stimulation, a stimulation pulse is applied to the skin receptor through an electrode, and parameters such as amplitude, frequency and the like of the stimulation pulse are changed in the stimulation process, so that a person can generate different stimulation feelings. The electrical stimulation pulses have two types, namely constant voltage pulses and constant current pulses, and the former is simpler. However, the intensity of stimulation to humans is mainly related to the stimulation current, and when a constant voltage type stimulation pulse is used, the stimulation current changes with the change of the contact resistance, and the stimulation intensity changes. When the constant current type stimulation pulse is used, the stimulation current is kept constant within a certain contact resistance range, so that the stimulation intensity can not change along with the contact resistance. However, no two-dimensional ultrasonic blind guiding stick technical scheme based on constant current type stimulation pulses exists at present.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned defects of the prior art, the utility model aims to solve the technical problem that a two-dimensional ultrasonic blind guiding stick based on current dot matrix stimulation is provided, through increasing the scope of ultrasonic detection and through the mode for blind person's skin electrotactile, can obtain the real-time two-dimensional distribution information of barrier in an area to help the blind person to feel the environment better.
In order to achieve the above object, the present invention provides a two-dimensional ultrasonic blind guiding stick based on current lattice stimulation, which comprises a blind guiding stick body, a stimulation electrode lattice arranged on the blind guiding stick body, and a control circuit designed in the blind guiding stick body, wherein the control circuit comprises a single chip microcomputer, a signal converter, a plurality of ultrasonic ranging modules, a plurality of pulse distributors, and a stimulation current generator, the stimulation current generator comprises a plurality of driving circuits, a DC-DC boosting module, and a constant current controller, the output end of the single chip microcomputer is electrically connected with the plurality of ultrasonic ranging modules through the signal converter, the output end of the single chip microcomputer is further connected with the input ends of the plurality of pulse distributors, the output ends of the plurality of pulse distributors are respectively connected with the plurality of driving circuits, and the plurality of driving circuits are all connected with the output end of the DC-DC boosting module, and the output end of each driving circuit and the output end of the constant current controller are connected with the input end of the stimulating electrode.
Preferably, the number of the ultrasonic ranging modules is N, the stimulation electrode array has N rows of stimulation electrodes, each row of stimulation electrodes has M stimulation electrodes, and the value of M is determined according to the required distance resolution within the effective detection distance, then M is L/S, where L is the effective detection distance and S is the distance resolution.
Preferably, the signal converter model is CD 4052.
Preferably, the pulse distributor is a decoder model 74HC 138.
Preferably, the stimulation current generator includes a photovoltaic isolator PVI1050N and an N-channel fet CS1N60, an input end of the photovoltaic isolator PVI1050N is connected to an output end of the pulse distributor, an output end of the PVI1050N is connected to a gate and a source of the N-channel fet CS1N60, the gate and the source of the N-channel fet CS1N60 are further connected to a 1M Ω resistor, a drain of the N-channel fet CS1N60 is connected to an output end of the DC-DC boost module, and a source of the CS1N60 is connected to an input end of the stimulation electrode.
Preferably, the constant current controller comprises an operational amplifier and a triode, the in-phase end of the operational amplifier is connected with the adjustable end of a 10K omega adjustable resistor, one end of the adjustable resistor is connected with a 5V direct current power supply through a switch SW, the other end of the adjustable resistor is grounded, the inverting end of the operational amplifier is connected with the emitting electrode of the triode, the output end of the operational amplifier is connected with the base electrode of the triode, and the collector electrode of the triode is connected with the common input end of the stimulating electrode.
Preferably, the stimulation electrode occupies 10-20 cm of area2And the interval between two adjacent stimulating electrodes is about 5-10 mm.
Preferably, the input end of the DC-DC boost module is connected to a 5V DC power supply through a switch SW.
The utility model has the advantages that:
1. the detection range of the electronic blind guiding stick is expanded to one surface by adopting a plurality of ultrasonic waves which are distributed in a two-dimensional way for scanning.
2. Two-dimensional lattice electrical stimulation is applied, so that the blind can sense the two-dimensional distribution of the obstacles in a certain range, and the sensing information of the obstacles is greatly increased.
3. Based on uninterrupted ultrasonic detection and real-time electrical stimulation information for the blind, the movement of the barrier within the range can be sensed, so that the detection can be directed to the moving target.
4. The constant current type stimulating pulse is used, and the stimulating current is kept constant in a certain contact resistance range, so that the stimulating intensity is not changed along with the contact resistance, and the stimulating intensity of the skin of a human is easy to control.
The conception, the specific structure and the technical effects of the present invention will be further explained with reference to the accompanying drawings, so as to fully explain the objects, the features and the effects of the present invention.
Drawings
Fig. 1 is a schematic block diagram of a two-dimensional ultrasonic blind guiding stick based on current lattice stimulation;
fig. 2 is the circuit diagram of the specific implementation scheme of the two-dimensional ultrasonic blind guiding stick based on current lattice stimulation.
Detailed Description
As shown in figure 1, the two-dimensional ultrasonic blind guiding stick based on current lattice stimulation comprises a blind guiding stick body and a stimulation electrode lattice arranged on the blind guiding stick body, and a control circuit designed in the blind guiding stick body, wherein the control circuit comprises a singlechip, a signal converter, a plurality of ultrasonic ranging modules, a plurality of pulse distributors and a stimulation current generator, the stimulation current generator comprises a plurality of driving circuits, a DC-DC boosting module and a constant current controller, the output end of the single chip microcomputer is electrically connected with the plurality of ultrasonic ranging modules through a signal converter, the output end of the single chip microcomputer is also connected with the input ends of the plurality of pulse distributors, the output ends of the pulse distributors are respectively connected with a plurality of driving circuits which are all connected with the output end of the DC-DC boosting module, and the output end of each driving circuit and the output end of the constant current controller are connected with the input end of the stimulating electrode.
Fig. 2 is a specific implementation scheme of a two-dimensional ultrasonic blind guiding stick based on current lattice stimulation. Where U1 is a microcontroller. The ultrasonic ranging module has 4 paths.
U1 is a single chip microcomputer, MPSYS in the figure is an abbreviation of microprocessor system, and the general 8-bit single chip microcomputer can be used, such as MCS 51. U2 is a signal adapter, model number CD 4052. U3-U7 are 5 model 74HC138 decoders, which constitute the pulse selection distributor. U8 is a DC-DC boost module, and there are many types of DC-DC module products on the market, and the model is not limited, and the effect is to increase +5V voltage to 50V DC voltage, and provide high voltage electricity for the stimulating electrode, and the DC-DC boost module input end is connected with 5V DC power supply through switch SW.
The constant current controller comprises an operational amplifier U9 and a triode Q1, wherein the in-phase end of the operational amplifier is connected with a 10K omega adjustable resistor adjustable end, one end of the adjustable resistor is connected with a 5V direct current power supply through a switch SW, the other end of the adjustable resistor is grounded, the inverting end of the power operational amplifier is connected with a triode emitter, the output end of the operational amplifier is connected with a triode base, and a triode collector is connected with a common input end of a stimulating electrode.
Q4-Q35 are switch control tubes with 32 stimulation electrodes, U8-U39 are 32 photoelectric isolators which form a stimulation current generator, the type of the photoelectric isolator is preferably PVI1050N, the type of an N-channel field effect tube is preferably CS1N60, the input end of the PVI1050N of the photoelectric isolator is connected with the output end of the pulse distributor, the output end of the PVI1050N is connected with the grid and the source of the N-channel field effect tube CS1N60, the grid and the source of the N-channel field effect tube CS1N60 are also connected with a 1M omega resistor, the drain of the N-channel field effect tube CS1N60 is connected with the output end of the DC-DC boosting module, and the source of the CS1N60 is connected with the input end of the stimulation electrodes.
The microcontroller starts each ultrasonic ranging module in turn through the signal adapter, and receives and calculates the ranging information of the ultrasonic ranging modules. It outputs control code according to the distance measuring information, and selects a certain circuit of stimulating circuit to turn on by pulse selecting distributor with a certain frequency.
Due to the control of the constant current controller, the amplitude of the stimulation current is constant, i.e. does not change with the change of the skin contact resistance. The knob W on the faceplate can adjust the stimulation current amplitude, i.e. adjust the stimulation intensity. The principle is as follows: the input voltage of the constant current controller is UI (namely, the voltage divided and output to the operational amplifier after adjustment of the knob W), the non-inverting terminal voltage of the operational amplifier U9 is Up, the inverting terminal voltage is Un, then Up is UI, Un, when the triode is in saturation conduction, the collector current Ic is approximately equal to the emitter current Ie (the base current is relatively small and can be ignored), so that the current Io on the stimulation electrode satisfies: io Ic Ie Un/R1 UI/R1. Because Io is UI/R1 and R1 is a constant value, the circuit input voltage UI controls the current Io, i.e., Io does not change with the change of the load (human body resistance), thereby realizing voltage control and constant current. Adjustment of knob W then changes the UI size, so that adjustment of knob W can adjust the stimulation intensity.
The ultrasonic wave transmitting and receiving are completed by an ultrasonic ranging module. A plurality of ultrasonic ranging modules are distributed according to a certain interval angle. The separation angle is determined according to the divergence angle (e.g. 15 degrees) of the effective energy of the ultrasonic beam of each module, so that they can effectively cover an angular range without overlapping and carelessly covering (e.g. 4 ultrasonic ranging modules cover 60 degrees).
When N ultrasonic ranging modules are used, the stimulation electrodes are provided with N rows, the arrangement angle of the N rows is consistent with the arrangement interval angle of ultrasonic beams, each row is provided with M stimulation points respectively, the value of M is determined according to the required distance resolution in the effective detection distance, for example, the effective detection distance is L, the distance resolution is required to be S, the M is L/S, the effective detection distance of the general ultrasonic ranging module can be more than 4M, the currents of all the stimulation electrodes form a loop through a common electrode at the top end of the array, and all the stimulation electrodes only occupy 10-20 cm2In the range, the interval between two adjacent electrodes is about 5-10 mm, and the stimulation can be sensed by hands and palms.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. A two-dimensional ultrasonic blind guiding stick based on current lattice stimulation is characterized in that: the blind guiding stick comprises a blind guiding stick body, a stimulation electrode dot matrix arranged on the blind guiding stick body, and a control circuit designed in the blind guiding stick body, wherein the control circuit comprises a single chip microcomputer, a signal converter, a plurality of ultrasonic ranging modules, a plurality of pulse distributors and a stimulation current generator, the stimulation current generator comprises a plurality of driving circuits, a DC-DC boosting module and a constant current controller, the output end of the single chip microcomputer is electrically connected with the plurality of ultrasonic ranging modules through the signal converter, the output end of the single chip microcomputer is further connected with the input ends of the plurality of pulse distributors, the output ends of the plurality of pulse distributors are respectively connected with the plurality of driving circuits, the plurality of driving circuits are connected with the output end of the DC-DC boosting module, and the output end of each driving circuit is connected with the output end of the constant current controller and is connected with the input end.
2. The two-dimensional ultrasonic blind-guiding stick based on current lattice stimulation as claimed in claim 1, wherein the number of the ultrasonic ranging modules is N, the number of the stimulation electrodes in the stimulation electrode array is N, each stimulation electrode in the stimulation electrode array has M stimulation electrodes, and the value of M is L/S according to the required distance resolution within the effective detection distance, where L is the effective detection distance and S is the distance resolution.
3. The two-dimensional ultrasonic blind guiding stick based on current lattice stimulation according to claim 1, characterized in that: the signal converter is of the type CD 4052.
4. The two-dimensional ultrasonic blind guiding stick based on current lattice stimulation according to claim 1, characterized in that: the pulse distributor is a model 74HC138 decoder.
5. The two-dimensional ultrasonic blind guiding stick based on current lattice stimulation according to claim 1, characterized in that: the stimulation current generator comprises a photoelectric isolator PVI1050N and an N-channel field effect transistor CS1N60, wherein the input end of the photoelectric isolator PVI1050N is connected with the output end of the pulse distributor, the output end of the PVI1050N is connected with the grid and the source of the N-channel field effect transistor CS1N60, the grid and the source of the N-channel field effect transistor CS1N60 are further connected with a 1M omega resistor, the drain of the N-channel field effect transistor CS1N60 is connected with the output end of the DC-DC boosting module, and the source of the CS1N60 is connected with the input end of a stimulation electrode.
6. The two-dimensional ultrasonic blind guiding stick based on current lattice stimulation according to claim 1, characterized in that: the constant current controller comprises an operational amplifier and a triode, wherein the in-phase end of the operational amplifier is connected with the adjustable end of a 10K omega adjustable resistor, one end of the adjustable resistor is connected with a 5V direct current power supply through a switch SW, the other end of the adjustable resistor is grounded, the inverting end of the operational amplifier is connected with the emitting electrode of the triode, the output end of the operational amplifier is connected with the base electrode of the triode, and the collecting electrode of the triode is connected with the common input end of a stimulating electrode.
7. The two-dimensional ultrasonic blind guiding stick based on current lattice stimulation according to claim 1, characterized in that: the area occupied by the stimulating electrode is 10-20 cm2And the interval between two adjacent stimulating electrodes is about 5-10 mm.
8. The two-dimensional ultrasonic blind guiding stick based on current lattice stimulation according to claim 1, characterized in that: and the input end of the DC-DC boosting module is connected with a 5V direct-current power supply through a switch SW.
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| CN201920669864.0U CN211132018U (en) | 2019-05-11 | 2019-05-11 | Two-dimensional ultrasonic blind guiding stick based on current lattice stimulation |
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| CN201920669864.0U CN211132018U (en) | 2019-05-11 | 2019-05-11 | Two-dimensional ultrasonic blind guiding stick based on current lattice stimulation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109966126A (en) * | 2019-05-11 | 2019-07-05 | 上海健康医学院 | A kind of two-dimensional ultrasound blind-guiding stick based on the stimulation of electric current dot matrix |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109966126A (en) * | 2019-05-11 | 2019-07-05 | 上海健康医学院 | A kind of two-dimensional ultrasound blind-guiding stick based on the stimulation of electric current dot matrix |
| CN109966126B (en) * | 2019-05-11 | 2024-06-11 | 上海健康医学院 | Two-dimensional ultrasonic guide crutch based on current lattice stimulation |
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Granted publication date: 20200731 |