CN110728886A

CN110728886A - Braille learning system, fingertip sensor and forming method thereof

Info

Publication number: CN110728886A
Application number: CN201911046599.1A
Authority: CN
Inventors: 李砚秋; 喻娟
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Display Technology Co Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-01-24
Anticipated expiration: 2039-10-30
Also published as: CN110728886B

Abstract

The application provides a braille learning system, a fingertip sensor and a forming method thereof, wherein the system comprises: fingertip detector and bracelet, the bracelet includes: the device comprises a first communicator, a camera and a converter, wherein the fingertip detector can detect braille and send the detected detection braille to a bracelet, the converter in the bracelet can convert the detection braille to generate identification words, the player plays the identification words, the camera in the bracelet can acquire target words, the converter converts the target words to generate simulation braille and sends the simulation braille to the fingertip detector, the fingertip detector receives the simulation braille sent by the bracelet, and generates braille pulse signals according to the simulation braille and stimulates the fingers of a user to simulate the braille. The Braille learning system is low in price and convenient to carry, can read Braille and words, enlarges the reading range of the blind, brings convenience to the life of the blind, has a touch feedback function, and enables the blind to sense the Braille through the touch feedback function.

Description

Braille learning system, fingertip sensor and forming method thereof

Technical Field

The application relates to the technical field of modern electronic application, in particular to a braille learning system, a fingertip sensor and a forming method of the braille learning system.

Background

In the related art, the implementation mode of the braille reader is mainly the braille reader utilizing the mechanical principle. The braille reader utilizing the mechanical principle is used, the blind person can read by touching the surface of the braille reader, but only one line of content can be displayed at a time, and the braille reader has larger volume, is inconvenient to carry and is expensive.

Disclosure of Invention

The application provides a braille learning system, a fingertip sensor and a forming method thereof, which are used for solving the problems of inconvenient carrying and high price of a braille reader utilizing a mechanical principle in the related technology.

An embodiment of an aspect of the present application provides a braille learning system, including:

the fingertip detector is used for detecting the braille, sending the detected braille to the bracelet, receiving the simulated braille sent by the bracelet, generating a braille pulse signal according to the simulated braille, and stimulating the fingers of a user to simulate the simulated braille;

the bracelet, the bracelet includes:

a first communicator for communicating with said fingertip detector;

the camera is used for acquiring target characters;

the converter is used for converting the detected braille acquired by the fingertip detector to generate recognized characters and converting the target characters to generate the simulated braille;

and the player is used for playing the identification characters or the target characters.

The braille learning system of the embodiment of the application, including fingertip detector and bracelet, wherein, the bracelet includes: the device comprises a first communicator, a camera and a converter, wherein the fingertip detector can detect braille and send the detected detection braille to a bracelet, the converter in the bracelet can convert the detection braille to generate identification words, the player plays the identification words, the camera in the bracelet can acquire target words, the converter converts the target words to generate simulation braille and sends the simulation braille to the fingertip detector, the fingertip detector receives the simulation braille sent by the bracelet, and generates braille pulse signals according to the simulation braille and stimulates the fingers of a user to simulate the braille. Therefore, the Braille learning system is low in price and convenient to carry, can read Braille and words, enlarges the reading range of the blind, brings convenience to the life of the blind, has the tactile feedback function, enables the blind to read and feel the sense of reality of reading through the tactile feedback function when the words are read, and even if a user who does not know the Braille can learn the Braille.

As an embodiment of an aspect, in a possible implementation manner, the fingertip detector includes:

a fingertip sensor;

a second communicator for communicating with the bracelet; and

and the pulse generator is used for generating the Braille pulse signal according to the analog Braille.

As an embodiment of an aspect, in a possible implementation manner, the fingertip sensor includes:

a first electrode and a second electrode which are oppositely arranged;

the pressure structure is arranged between the first electrode and the second electrode, and used for generating a pressure detection signal according to external pressure change, outputting the pressure detection signal through the first electrode and the second electrode, and carrying out deformation according to pulse signals applied by the first electrode and the second electrode so as to simulate Braille.

As an example of one aspect, a possible implementation manner of the pressure structure includes a plurality of pressure layers.

As an example of one aspect, one possible implementation, the compressive layer includes a PVDF and PZT particle composite structure.

As an example of one aspect, the camera is located at the mouth of the user's hand.

Another embodiment of the present application provides a fingertip sensor, including:

a first electrode and a second electrode which are oppositely arranged;

The fingertip sensor comprises a first electrode and a second electrode which are arranged oppositely, and a pressure structure between the first electrode and the second electrode, wherein the pressure structure can generate pressure detection signals according to external pressure changes and output the pressure detection signals through the first electrode and the second electrode, Braille detection is achieved, pulse signals applied according to the first electrode and the second electrode are deformed to simulate Braille, the touch feedback function is achieved, the Braille can be read by the blind, and the Braille can be learned by a user who does not understand the Braille.

As one possible implementation of another aspect of the present disclosure, the pressure structure includes a plurality of pressure layers.

As one possible implementation of another aspect of the present application, the pressure layer includes a PVDF and PZT particle composite structure.

Another embodiment of the present application provides a method for forming a fingertip sensor, including:

dispersing PVDF and PZT particles in DMF according to a preset proportion, and stirring at a first preset temperature for a first preset time;

after the PVDF is dissolved, the PZT particles are dispersed in the DMF, and the stirring is continued for a second preset time;

dropping deionized water into the solution to precipitate PZT particles dispersed in PVDF, and dissolving DMF in water;

drying at a second preset temperature for a third preset time to obtain the PVDF and PZT particle composite material;

and oppositely arranging a first electrode and a second electrode on the PVDF and PZT particle composite material.

According to the forming method of the fingertip sensor, the PVDF and PZT particle composite material can be obtained by a simple manufacturing process according to the PVDF, PZT particles and DMF, and then the fingertip sensor is obtained according to the PVDF and PZT particle composite material.

As a possible implementation manner of another aspect of this application, after the composite structure of PVDF and PZT particles, the method further includes:

heating the composite material to a third preset temperature, and melting for a fourth preset time;

applying a first preset pressure and heating to a fourth preset temperature to disentangle the tangled molecular chains and form locally ordered chains, wherein the fourth preset temperature is higher than the third preset temperature;

and applying a second preset pressure for a fifth preset time to obtain the layered beta-phase thin plate crystal, wherein the second preset pressure is greater than the first preset pressure.

Additional aspects and advantages of the present application 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 present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application 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 a Braille learning system according to an embodiment of the present application;

FIG. 2 is a wearing schematic diagram of a Braille learning system provided by the embodiment of the application;

FIG. 3 is a schematic diagram illustrating a process of converting Chinese to Braille according to an embodiment of the present disclosure;

fig. 4 is a schematic view illustrating a bracelet wearing provided in an embodiment of the present application;

fig. 5 is a schematic view of a bracelet recognition when reading a medicine bottle specification, according to an embodiment of the present application, a camera may be aligned with the medicine bottle specification;

fig. 6 is a schematic view illustrating bracelet identification when reading a large-surface-area reading material such as books, newspapers and periodicals according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another Braille learning system provided by the embodiment of the present application;

FIG. 8 is a schematic diagram of a Braille reading process according to an embodiment of the present application;

FIG. 9 is a diagram illustrating a text reading process according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of a fingertip sensor provided in an embodiment of the present application;

FIG. 11 is a schematic diagram of a layered fingertip sensor according to an embodiment of the present application;

fig. 12 is a schematic flowchart of a method for forming a fingertip sensor according to an embodiment of the present disclosure;

FIG. 13 is a schematic illustration of a process for forming a PVDF and PZT particle composite as provided in an embodiment of the present application;

FIG. 14 is a schematic illustration of further operation of a PVDF and PZT particle composite provided by an embodiment of the present application;

fig. 15 is a schematic perspective view of a layered β -phase thin plate crystal according to an embodiment of the present application.

Detailed Description

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

The braille learning system, the fingertip sensor, and the forming method thereof of the embodiments of the present application are described below with reference to the drawings.

The embodiment of the application provides a braille learning system aiming at the problems of inconvenience in carrying and high price of a braille reader utilizing a mechanical principle in the related technology.

The braille learning system of the embodiment of the application, including fingertip detector and bracelet, wherein, the bracelet includes: the device comprises a first communicator, a camera and a converter, wherein the fingertip detector can detect braille and send the detected detection braille to a bracelet, the converter in the bracelet can convert the detection braille to generate identification words, the player plays the identification words, the camera in the bracelet can acquire target words, the converter converts the target words to generate simulation braille and sends the simulation braille to the fingertip detector, the fingertip detector receives the simulation braille sent by the bracelet, and generates braille pulse signals according to the simulation braille and stimulates the fingers of a user to simulate the braille. The Braille learning system is low in price and convenient to carry, can read Braille and words, enlarges the reading range of the blind, brings convenience to the life of the blind, has the function of tactile feedback, enables the blind to read and feel the sense of reality of reading through the function of tactile feedback when the words are read, and even if a user who does not know the Braille can learn the Braille.

Fig. 1 is a schematic structural diagram of a braille learning system according to an embodiment of the present application.

As shown in fig. 1, the braille learning system 100 includes: a fingertip detector 110 and a bracelet 120.

In this embodiment, the fingertip detector 110 may detect the braille, transmit the detected braille to the bracelet 120, receive the simulated braille of the bracelet 120, generate a braille pulse signal according to the simulated braille, and stimulate the fingers of the user to simulate the simulated braille, thereby implementing the tactile feedback.

The bracelet 120 includes a first communicator 121, a camera 122, a converter 123, and a player 124.

Among them, the first communicator 121 is used for communicating with the fingertip detector 110, such as receiving and detecting braille from the fingertip detector 110, or transmitting analog braille to the fingertip detector 110, etc. The first communicator 121 may be a bluetooth module, a WiFi module, or the like.

The camera 122 is used to obtain target words, for example, when the fingertip detector 110 touches words other than braille, the camera 122 can take pictures, thereby obtaining the target words from the taken pictures.

A converter 123 for converting the detected braille obtained by the fingertip detection 110 to generate recognized letters and converting the target letters to generate analog braille.

The player 124 is used to play the identification text or the target text. For example, when the detection result of the braille is obtained by the fingertip detector 110, the detection result is sent to the bracelet 120, and the bracelet 120 can play corresponding characters through the player 124, or when the braille learning system learns characters, the bracelet 120 can play the learned characters through the player 124.

In a specific use, the fingertip detector 110 may be adhered to any finger, and the bracelet 120 may be worn on the wrist, as shown in fig. 2, where fig. 2 is a wearing schematic diagram of a braille learning system provided in the embodiment of the present application.

The braille learning system of the embodiment of the application can read braille and can also read characters. Specifically, when reading braille, the fingertip detector 110 detects the braille and transmits the detected braille to the bracelet 120, the bracelet 120 receives and detects the braille through the first communicator 121, then the converter 123 converts the detected braille to generate identification words, and then the player 124 plays the identification words, thereby feeding back the detected braille to the user.

When a user touches the text, the braille is not detected by the fingertip detector 110, then the camera 122 is turned on by the bracelet 120, the text is scanned by the camera 122, and according to the scanned picture, for example, the text recognition is performed on the scanned picture, so as to obtain the target text. Then, the converter 123 converts the target letter to generate analog braille, and the bracelet 120 transmits the analog braille to the fingertip detector 110 through the first communicator 121.

After receiving the simulated braille, the fingertip detector 110 can generate braille pulse signals according to the simulated braille, and stimulate the fingers of the user according to the braille pulse signals to simulate the simulated braille, so that the detected characters can be converted into braille and fed back to the fingertip detector, the blind can read and feel the sense of reality of reading, the user who cannot use the braille can also use the braille, and the learning of the braille can be enhanced through the touch feedback function.

Fig. 3 is a schematic diagram of a process of converting chinese into braille according to an embodiment of the present disclosure. As shown in fig. 3, the conversion of kanji to braille is divided into three processes: automatic word segmentation system, Chinese-Pinyin conversion and Chinese-Braille conversion.

Specifically, pictures scanned by the camera are identified, detected characters are determined by combining a Chinese character font library, and a text to be split is obtained according to the detected characters. And then, performing word segmentation on the text to be segmented by using a word segmentation algorithm to obtain a word segmentation result, wherein the word segmentation result can be obtained by using a word segmentation system and a word segmentation library when the word segmentation algorithm is specifically applied.

Next, the chinese-to-pinyin conversion process follows. In the process, whether the obtained word segmentation is a polyphone or not is judged, if the word segmentation is the polyphone, the polyphone character is judged according to a polyphone character library and a pinyin character string is output, and if the word segmentation is not the polyphone, the pinyin character string is directly output by using a Chinese-pinyin library. And then converting the character string pinyin into pinyin groups and outputting the Chinese pinyin groups.

After the Chinese pinyin group is obtained, the conversion process of Chinese to braille is carried out. In the process, the conversion from the Chinese pinyin to the Braille pinyin is carried out on the pinyin group according to the Chinese pinyin-Braille pinyin library, so that the Braille pinyin is obtained. Then, the braille is generated according to the braille pinyin, and the braille is output and stored. Therefore, the detected Chinese characters are converted into the analog Braille.

Fig. 4 is a bracelet wearing schematic diagram provided by the embodiment of the application. In practical application, in order to improve reading efficiency and accuracy, when wearing the bracelet, the camera on the bracelet can be positioned at the mouth of the hand of the user, as shown in fig. 4, and a player is also shown in fig. 4. Therefore, when the characters are read, the camera is opposite to the characters, and the camera is convenient to collect images. It should be noted that the position of the player in fig. 4 is only an example, and should not be considered as a limitation to the present application.

Fig. 5 is a schematic view of bracelet identification when reading a medicine bottle specification, according to an embodiment of the present application, a camera can be aligned with the medicine bottle specification.

When a reading with a large volume or area needs to be read, the thumb and the index finger of the palm are placed on the reading, and the reading can be used as a tripod, as shown in fig. 6, fig. 6 is a schematic view of bracelet identification when the reading with a large surface area, such as books and periodicals, is provided by the embodiment of the application.

Generally, the blind person can only buy the blind documents after reading the books, and the Braille book books are few, so that the expansion of the knowledge plane of the blind person is greatly limited. In addition, in daily life, specifications of some foods and medicines and the like are not translated into braille, which brings inconvenience to the life of the blind. The Braille learning system of the embodiment of the application can read Braille and words, and enables the blind to perceive the Braille in a tactile feedback mode, so that the reading range of the blind is expanded, and great convenience is brought to life of the blind.

FIG. 7 is a schematic structural diagram of another Braille learning system provided in the embodiment of the present application.

As shown in fig. 7, the braille learning system 100 includes: a fingertip detector 110 and a bracelet 120.

In the present embodiment, the fingertip detector 110 includes: a fingertip sensor 111, a second communicator 112, and a pulse generator 113.

The fingertip sensor 111 can be used to detect braille; the second communicator 112 is used for communicating with the bracelet 120; and a pulse generator 113 for generating a braille pulse signal from the analog braille.

The fingertip sensor can be made of PZT and PVDF composite materials; the second communicator 112 corresponds to the first communicator 121 in the bracelet 120, and the communication between the fingertip detector 110 and the fingertips of the bracelet 120 is realized through the second communicator 112 and the first communicator 121. Wherein the second communicator 112 and the first communicator 121 may be a bluetooth module, a WiFi module, etc.

When the fingertip detector on the finger touches the braille, the fingertip sensor 111 detects the braille and transmits the detected braille to the bracelet 120 through the second communicator 112. The bracelet 120 receives the detected braille through the first communicator 121, converts the braille into recognized letters through the converter 123, and plays the recognized letters through the player 124 to feed back the detected braille to the user.

When the fingertip detector on the finger touches the character information, the fingertip sensor 111 cannot detect the braille, the camera 122 on the bracelet 120 is turned on to shoot the characters touched by the user, the shot image is identified to obtain target characters, then the converter 123 converts the target characters into analog braille, and the first communicator 121 sends the analog braille to the fingertip detector 110. The fingertip detector 110 receives the analog braille through the second communicator 112, the pulse generator 113 generates a braille pulse signal according to the analog braille, and then the braille pulse signal is transferred to the fingertip sensor 111, so that the user perceives braille according to the stimulation of the braille pulse signal. Meanwhile, the player in the bracelet 120 can also play the acquired target text, so that the detected text information is fed back to the user.

Fig. 8 is a schematic diagram of a braille reading process according to an embodiment of the present application. As shown in fig. 8, a fingertip sensor and bluetooth for detecting braille are integrated in the fingertip detector, and a signal processor, a converter and a player and bluetooth are integrated in the bracelet.

In fig. 8, the fingertip sensor sends the detected braille information to the signal processor through bluetooth, the signal processor can integrate the braille information, and then the braille information is converted into the Chinese characters by the converter and is played by the player in voice. Wherein, the signal processor can be powered by a 5V power supply.

Fig. 9 is a schematic diagram of a text reading process according to an embodiment of the present application. As shown in fig. 9, in the process of reading characters, the used camera, the signal processor and the converter, and the bluetooth are integrated in the bracelet, and the pulse generator, the fingertip sensor, and the bluetooth are integrated in the fingertip detector.

In fig. 9, the camera scans the chinese characters and transmits and stores the chinese character information to the signal processor, the signal processor transmits the collected chinese character information to the converter, the converter converts the detected chinese character information into braille, the detected chinese character information is transmitted to the pulse generator through bluetooth, the pulse generator is transmitted to the fingertip sensor in a pulse signal manner, and the user perceives braille according to the stimulation of the pulse signal. Meanwhile, the converter directly transmits the detected Chinese character information to the player, and the player feeds the detected character information back to the user in a voice mode.

In the embodiment of the application, the fingertip detector is communicated with the bracelet through the second communicator, and the Braille pulse signal is generated by simulating Braille through the pulse generator, so that a user can perceive Braille through detected characters in a touch manner. The Braille learning system is low in price and convenient to carry, can read Braille and words, enlarges the reading range of the blind, brings convenience to the life of the blind, has the tactile feedback function, enables the blind to read and feel the sense of reality of reading through the tactile feedback function when the words are read, and even if a user who does not know the Braille can learn the Braille.

In one embodiment of the present application, the fingertip sensor detects braille or gives tactile feedback to the user through the pressure structure. Specifically, the fingertip sensor includes: the piezoelectric element comprises a first electrode, a second electrode and a pressure structure, wherein the first electrode and the second electrode are oppositely arranged, and the pressure structure is arranged between the first electrode and the second electrode.

The pressure structure is used for generating a pressure detection signal according to external pressure change and outputting the pressure detection signal through the first electrode and the second electrode, and deformation is carried out according to pulse signals applied by the first electrode and the second electrode so as to simulate Braille.

Specifically, when a user touches the braille through the fingertip sensor, the pressure structure of the fingertip sensor generates a pressure detection signal according to the external pressure change when the user touches the braille, and the pressure detection signal is output through the first electrode and the second electrode, so that the detection of the braille is realized.

When reading characters, the fingertip detector receives simulated braille sent by the bracelet, the pulse generator of the fingertip sensor generates braille pulse signals according to the simulated braille, the braille pulse signals are applied to the first electrode and the second electrode of the fingertip sensor, the pressure structure deforms according to the pulse signals applied by the first electrode and the second electrode, the user feels in a tactile sense, the simulated braille is achieved, and therefore when reading the characters, the user can sense the braille through tactile feedback, and even a person who does not know the braille can use the pressure structure.

In order to improve the sensitivity of the fingertip sensor, in one embodiment of the present application, the pressure structure of the fingertip sensor may include a plurality of pressure layers, and the layered structure facilitates stress relief and enables a fast response to external forces. Meanwhile, the pressure structure comprising a plurality of pressure layers can effectively avoid the damage to the whole structure, and the potential accumulation of different layers makes the pressure structure more sensitive to pressure, so that the pressure structure has better stability.

In one embodiment of the present application, the compressive layer comprises a PVDF and PZT particle composite structure.

In order to realize the above embodiments, the present application also provides a fingertip sensor. Fig. 10 is a schematic structural diagram of a fingertip sensor according to an embodiment of the present application.

As shown in fig. 10, the fingertip sensor includes: a first electrode 210, a second electrode 220, and a pressure structure 230.

The first electrode 210 is disposed opposite to the second electrode 220, and the pressure structure 230 is disposed between the first electrode 210 and the second electrode 220.

The pressure structure 220 is used to generate a pressure detection signal according to the external pressure variation and output through the first and second electrodes, and to deform according to the pulse signal applied by the first and second electrodes to simulate braille.

Specifically, when the user touches the braille through the fingertip sensor, the pressure structure 230 of the fingertip sensor generates a pressure detection signal according to an external pressure change when the user touches, and outputs the pressure detection signal through the first electrode 210 and the second electrode 220, thereby implementing detection of the braille.

When reading characters, the fingertip detector receives the simulated braille transmitted by the bracelet, the pulse generator of the fingertip detector generates braille pulse signals according to the simulated braille, the braille pulse signals are applied to the first electrode 210 and the second electrode 220 of the fingertip sensor, the pressure structure 230 deforms according to the pulse signals applied by the first electrode 210 and the second electrode 220, the user feels in a touch manner, the simulated braille is achieved, and therefore when reading the characters, the user can sense the braille through touch feedback, and even a person who does not understand the braille can use the pressure structure.

In order to improve the sensitivity of the fingertip sensor, in an embodiment of the present application, the pressure structure 230 of the fingertip sensor may include a plurality of pressure layers, as shown in fig. 11, where fig. 11 is a schematic diagram of a fingertip sensor with a layered structure provided in an embodiment of the present application.

In the embodiment of the application, the laminated structure is beneficial to stress release and can quickly respond to external force. Meanwhile, the pressure structure comprising a plurality of pressure layers can effectively avoid the damage to the whole structure, and the potential accumulation of different layers makes the pressure structure more sensitive to pressure, so that the pressure structure has better stability.

In one embodiment of the present application, the pressure layer comprises a PVDF and PZT particle composite structure, as shown in fig. 11.

In order to implement the above embodiments, the present application also provides a method for forming a fingertip sensor. Fig. 12 is a schematic flowchart of a method for forming a fingertip sensor according to an embodiment of the present application.

As shown in fig. 12, the method of forming the fingertip sensor includes:

step 301, dispersing PVDF and PZT particles in DMF at a predetermined ratio, and stirring at a first predetermined temperature for a first predetermined time.

For example, PVDF and PZT particles are dispersed in DMF at a ratio of 1:10, and stirred at 70 ℃ for 3 hours, and further stirred at room temperature for 3 hours.

Step 302, after the PVDF is dissolved, the PZT particles are dispersed in DMF, and stirring is continued for a second preset time.

For example, the second predetermined period is 5 hours, and after the PVDF is dissolved, the PZT particles are dispersed in DMF and stirring is continued for 5 hours.

Step 303, dropping deionized water into the solution to precipitate PZT particles dispersed in PVDF, and dissolving DMF in water.

And 304, drying at a second preset temperature for a third preset time to obtain the PVDF and PZT particle composite material.

For example, the second predetermined temperature is 80 ℃ and the third predetermined time period is 12 hours, and the solution may be dried at 80 ℃ for 12 hours.

Step 305, a first electrode and a second electrode are oppositely arranged on the PVDF and PZT particle composite material.

After obtaining the PVDF and PZT particle composite material, a first electrode and a second electrode may be oppositely disposed on both sides of the composite material, so that the first electrode and the second electrode are disposed between the PVDF and PZT particle composite material structure, thereby obtaining the fingertip sensor.

It should be noted that the first preset temperature, the second preset temperature, the first preset time, the second preset time and the third preset time may be set according to an actual production environment, conditions and the like.

In this example, due to the extremely fast phase separation process, the method allows PZT particles to be uniformly dispersed in PVDF, which tends to cause aggregation of inorganic particles during a relatively long drying process, as compared to conventional solvent casting and drying.

The above process of forming a composite of PVDF and PZT particles is illustrated below. Fig. 13 is a schematic diagram of a process for forming a PVDF and PZT particle composite according to an embodiment of the present disclosure.

As shown in fig. 13, step 1: PVDF and PZT particles are respectively dispersed in DMF in a ratio of 1: 10; step 2: stirring at 70 deg.C for 3h, and stirring at room temperature for 3h, such as 26 deg.C; and step 3: after the PVDF is dissolved, PZT particles are dispersed in DMF; and 4, step 4: continuously stirring for 5 hours; and 5: on the basis, deionized water is dripped into the solution; step 6: precipitation of PZT particles dispersed in PVDF, DMF dissolved in water; and 7: drying the composite material film at 80 ℃ for 12h to complete the preparation of the composite material film; and 8: and (3) cutting the PVDF and PZT particle composite material.

Further, in order to improve the piezoelectric performance of the composite material, in an embodiment of the present application, after obtaining the PVDF and PZT particle composite material structure, the composite material may be heated to a third preset temperature, melted for a fourth preset time, then applied with the first preset pressure, and heated to the fourth preset temperature, so as to disentangle the tangled molecular chains and form locally ordered chains, and then applied with the second preset pressure for a fifth preset time, so as to obtain the layered β -phase thin plate crystal.

The fourth preset temperature is higher than the third preset temperature, and the second preset pressure is higher than the first preset pressure.

For example, the third preset temperature is 200 ℃, the fourth preset time is 10 minutes, the first preset pressure is 150Mpa, the fourth preset temperature is 260 ℃, the second preset pressure is 400Mpa, and the fifth preset time is 10 minutes. FIG. 14 is a schematic illustration of further operations provided in embodiments of the present application for a PVDF and PZT particle composite.

As shown in fig. 14, the composite material was heated to 200 ℃, melted for 10 minutes, and then applied with 150MPa pressure, raising the temperature to 260 ℃, the entangled molecular chains would unravel and form partially ordered chains. And then, further increasing the pressure to 400Mpa for 10 minutes, converting the conformation of the polyvinylidene fluoride chain by using ultrahigh pressure to obtain a fully-inverted conformation beta-phase lamellar crystal, implanting inorganic particles into the lamellar crystal to enhance piezoelectricity, and forming a layered beta-phase thin plate crystal.

As can be seen from fig. 14, the PDVF chains in the composite material obtained from fig. 13 are disordered, and after melting for 10 minutes at 200 ℃, and applying a pressure of 150MPa, PZT particles and PDVF chains are locally ordered, and after applying 400MPa for 10 minutes, a thin layer is obtained. The three-dimensional structure of the layered β -phase thin plate crystal is shown in fig. 15, and fig. 15 is a schematic view of the three-dimensional structure of the layered β -phase thin plate crystal provided in the embodiment of the present application.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. The braille learning system is characterized by comprising a fingertip detector and a bracelet:

the bracelet, the bracelet includes:

a first communicator for communicating with said fingertip detector;

the camera is used for acquiring target characters;

2. A braille learning system according to claim 1, characterized in that the fingertip detector comprises:

a fingertip sensor;

a second communicator for communicating with the bracelet; and

3. A braille learning system according to claim 2, characterized in that the fingertip sensor comprises:

a first electrode and a second electrode which are oppositely arranged;

4. A braille learning system according to claim 3, characterized in that the pressure structure comprises a plurality of pressure layers.

5. A braille learning system according to claim 4, characterized in that the pressure layer comprises a PVDF and PZT particle composite structure.

6. A braille learning system according to claim 1, characterized in that the camera is located at the mouth of the hand of the user.

7. A fingertip sensor, comprising:

a first electrode and a second electrode which are oppositely arranged;

8. The fingertip sensor of claim 7, wherein the pressure structure includes a plurality of pressure layers.

9. A braille learning system according to claim 8, characterized in that the pressure layer comprises a PVDF and PZT particle composite structure.

10. A method of forming a fingertip sensor, comprising:

11. The method of forming a fingertip sensor of claim 10, wherein after obtaining the PVDF and PZT particle composite material structure, further comprising: