CN103985289B - A kind of portable braille reader - Google Patents

Abstract

_A portable braille reader belongs to the field of braille readers and solves the problem that blind people can read electronic books conveniently; ) is equipped with a hardware control system, which is composed of an FPGA main control module (11), a USB communication module (10), a power management module (9), a high-voltage driver module (13) and a Braille dot matrix driver module (14); Press the button, select the required according to the needs, that is, the data information in the USB flash drive can be transmitted to the FPGA main control module (11) through the USB communication module (10), execute the corresponding software, and complete the corresponding functions. The blind can point the display screen (15) through Braille Fast and convenient reading; small size, easy to carry, in line with the operating habits of the blind, easy to use, identify and read for the blind, can reduce the cost of reading for the blind, benefit the equal participation of the blind in society, improve living standards, and have a good public welfare.

Description

A portable braille reader

technical field

The invention belongs to the field of braille reading devices, and relates to a portable braille reader.

Background technique

In the prior art, for the special group of the blind, the opportunities for reading and learning are very limited, and are basically limited to direct reading of periodicals and books published in Braille, and the variety and quantity of Braille publications are very strange. It is far from being able to meet the increasing reading needs of blind readers.

With the development of electronic publishing technology and attention to the improvement of the quality of life of disadvantaged groups, such as Microsoft and Pulse International Data Corporation jointly announced in 2000 that they planned to launch e-books for the blind and visually impaired, and the US government standardization agency also launched A book reader that converts electronic text to Braille; but as far as the disclosed Braille electronic reading devices are concerned, most of them are Braille reading devices based on text and graphic recognition and/or voice broadcasting. A Braille electronic reader for reading electronic books (referring to electronic books in plain text Chinese character file format) stored in a USB flash drive or a removable hard disk on a Braille touch-sensitive screen (hereinafter referred to as a Braille display screen).

Contents of the invention

Technical issues solved:

Provide a portable braille reader, which can overcome the deficiencies in the existing technology and fill the domestic gap; it can selectively read-store-convert the electronic books in the USB flash drive or removable hard disk according to the needs, and then display them in Braille The data is sent to the Braille dot display screen for the blind to read. It is convenient and fast to use and operate, and can meet the increasing reading needs of the blind readers, and the production cost is low, and the reading cost of the blind is low.

The technical solution adopted:

A portable braille reader, with a casing, the casing is provided with an external power socket, external and internal power switches, a power indicator, an air grid, a USB interface, function keys and a braille display screen, and the casing is equipped with a corresponding The hardware control system and the lithium battery are characterized in that: the structure of the hardware control system is composed of seven modules as follows, the power management module processes the DC voltage provided by the external 220V AC voltage adapter or the DC voltage provided by the lithium battery, Provide stable DC Vcc-5V and D3V3B-3.3V power supply for the system; the USB communication module accepts the control signal sent by the FPGA main control module, reads the information in the USB flash drive or active hard disk plugged into the system, and transfers the USB flash drive Or the data information in the active hard disk is transmitted to the FPGA main control module through the USB communication module; the function button module is for the blind to send corresponding control signals to the FPGA main control module through the corresponding function keys, thereby controlling the FPGA main control module to complete the corresponding functions. The function keys include the left page-turning key, the right page-turning key, the OK key, the return directory key and the home page key; the FPGA main control module sends corresponding control signals to the USB communication module according to the received function key signals to control the USB communication module Read the information in the USB flash drive or active hard disk, and after receiving the data information sent by the USB communication module, process the data information through Chinese word segmentation, Chinese character-Braille conversion, and Braille-Braille dot matrix information conversion to obtain Braille dot matrix information , and then send the Braille dot matrix information to the Braille dot matrix driver module in the form of serial data; the high voltage driver module converts the DC 5V power signal provided by the power management module, and then provides a DC 154V high voltage power signal to the Braille dot display screen The braille dot matrix drive module receives the corresponding braille dot matrix information data and corresponding control signals sent by the FPGA main control module, and sends them to the braille dot display screen after photoelectric isolation to control the corresponding braille dots in the braille dot display screen The corresponding bump action in the control mechanism completes the Braille reading function; the Braille dot display screen is composed of 40 square dot display modules, and the DC 154V provided by the high-voltage drive module is used as the power supply, and the Braille dot matrix information sent by the Braille dot matrix drive module is passed through the serial- After conversion, it is sent to each dot display module to drive the bump action.

Beneficial effect:

A portable braille reader, which uses an external USB flash drive or mobile hard disk to store e-books in the general format of plain text Chinese character files, and there is no limit to the size of text files, with extensive content and convenient sources. It uses word segmentation technology for word processing, scientific, Reasonable and standardized, can well realize the expression form of modern Braille; adopt the SOPC technology based on the FPGA main control module, and realize the hardware module in the form of IP soft core inside the programmable chip (EP4CE15 chip in the FPGA main control module) , reducing the size of the system, and processing information quickly; equipped with a full-page Braille dot display screen, which can meet the reading speed requirements of the blind; There is also a lithium power supply that is convenient to use; therefore, the system and the overall device are small in size, easy to carry for the blind, conform to the operating habits of the blind, facilitate the identification and reading of the blind, convenient and fast to use, reduce the reading cost of the blind, and enable the blind to read a large number of books conveniently and quickly. E-books, timely access to knowledge, are beneficial for blind people to participate in society on an equal basis and improve their living standards; at the same time, they have good public welfare, broad market prospects and promotion value.

Description of drawings

Figure 1. Overall assembly structure diagram;

Fig. 2, according to the A direction view shown in Fig. 1;

Fig. 3, the structural block diagram of hardware control system;

The block diagram of Fig. 4, FPGA main control module 11;

Fig. 5, the circuit structural diagram of power management module 9;

The circuit structure diagram of Fig. 6, USB communication module 10;

Fig. 7, the circuit structure diagram of high-voltage driving module 13;

Fig. 8, the circuit structure diagram of Braille dot matrix driving module 14;

Fig. 9, the circuit structural diagram of function button module 12;

Figure 10. Braille bump control mechanism (a) bump retracted state; (b) bump raised state;

Figure 11. Block diagram of the software system.

detailed description

Further explain in detail in conjunction with accompanying drawings;

As shown in Figures 1 to 4:

A portable braille reader, which has a casing 1, and the casing 1 has an external power socket 2-that is, an external power socket J ₁ , an external power switch S ₁ , an internal power switch S ₂ , a DC 5V power indicator light D ₁ , a DC 3.3V power indicator light D ₃ , air grid 8 , USB interface J ₂ , five function keys: left page turning key 3, right page turning key 4, confirmation key 5, back to directory key 6 and home page key 7, braille Point display screen 15, corresponding hardware control system and lithium battery are housed in casing 1.

The structure of the hardware control system is composed of seven modules as follows. The power management module 9 provides stable DC Vcc-5V and D3V3B-3.3V power supply; USB communication module 10 is to accept the control signal that FPGA main control module 11 sends, reads the information in the flash disk or the active hard disk that is inserted on the system, and passes the data information in the flash disk or active hard disk through The USB communication module 10 passes to the FPGA main control module 11; the function key module 12 is that the blind person sends corresponding control signals to the FPGA main control module 11 through the corresponding function keys, and controls the FPGA main control module 11 to complete corresponding functions. Page turning key 3, right page turning key 4, confirmation key 5, return directory key 6 and return home page key 7; FPGA main control module 11 sends corresponding control signal to USB communication module 10 according to the function button signal that receives, controls The USB communication module 10 reads the information in the USB flash drive or the active hard disk, and after receiving the data information sent by the USB communication module 10, the data information is processed through Chinese word segmentation, Chinese character-Braille conversion, and Braille-Braille dot matrix information conversion, etc. Obtain the Braille dot matrix information, and then send the Braille dot matrix information to the Braille dot matrix drive module 14 in the form of serial data; the high voltage drive module 13 converts the DC 5V power signal provided by the power management module 9, and sends it to the Braille dot display screen 15 provides a DC 154V high-voltage power supply signal; the Braille dot matrix drive module 14 receives the corresponding Braille dot matrix information data and corresponding control signals sent by the FPGA main control module 11, and sends them to the Braille dot display screen 15 after photoelectric isolation , control the corresponding bump action in the corresponding Braille bump control mechanism in the Braille dot display screen 15 to complete the Braille reading function; , the Braille dot matrix information sent by the Braille dot matrix drive module 14 is sent to each dot display module after serial-to-parallel conversion to drive the bump action.

The structure of FPGA main control module 11 is, the core of described FPGA main control module 11 is the EP4CE15 chip of Altera Company, uses IP soft core to build with NIOSII microprocessor 16, GPIO first port 17 by SOPC technology in EP4CE15 chip , GPIO second port 18, on-chip memory 19, IATG-UART communication interface 20 and EPCS controller 21 system core Kernei and phase-locked loop module 22 that form; EPCS serial memory 23 is the configuration chip of FPGA main control module 11, Mainly store the system program, and complete the data communication with the EP4CE15 chip in the FPGA main control module 11 through the EPCS controller 21. After power-on, the system automatically loads the configuration data stored in the EPCS serial memory 23 to the FPGA main control module 11 In the EP4CE15 chip in the EP4CE15 chip; GPIO first port 17 accepts the button information that function key module 12 sends, and GPIO second port 18 carries out information exchange with USB communication module 10, accepts the data information that USB communication module 10 sends, simultaneously communicates to USB Module 10 sends control information; On-chip memory 19 stores the temporary data in the program running process; Clock module 24 provides the clock signal of 25MHz for the system, provides a clock signal of 100MHz to NIOSII microprocessor 16 after phase-locked loop 22; NIOSII Microprocessor 16 executes the system program, realizes the reading of files on the USB flash drive or the active hard disk, Chinese word segmentation, conversion of Chinese characters to Braille and the output of Braille dot matrix information. The debugging interface 25 is used for system debugging and system program downloading to EPCS in the serial memory 23.

As shown in Figure 5, the circuit structure of the power management module 9 is that the 220V AC external power supply is converted into DC 5V by the adapter and then connected through the external power supply socket J ₁ - that is, the external power supply socket 2, and a diode is installed behind the external power supply socket J ₁ D ₂ , for short-circuit protection, the internal power supply of the DC 5V lithium battery is connected through the internal power interface P ₁ , the external power supply and the internal power supply are respectively connected in parallel through the external power switch S ₁ and the internal power switch S ₂ , and the self-recovery fuse F ₂ and After filtering, it is output as a DC V _CC -5V; one V _CC -5V is directly output to the high-voltage drive module 13, and an LED light is used as a power indicator D ₁ , and another - V _CC -5V is passed through a self-recovery fuse F ₁ Finally, it is converted to DC D3V3B-3.3V by the LM1117S-3.3 chip, and output to the FPGA main control module 11 and other corresponding modules, and an LED light is used as the power indicator D ₃ .

As shown in Fig. 6, the circuit structure of USB communication module 10 is, with direct current D3V3B-3.3V as power supply, adopts the CH376 communication chip of eight-bit bus mode, has twelve wires with the EP4CE15 chip of FPGA main control module 11 The eight data lines USB_DB0-USB_DB7 are used to send the data information read by the CH376 communication chip to the FPGA main control module 11, and the four control lines USB_WR, USB_RD, USB_AO and USB_INT are used to transmit the data information generated and sent by the FPGA main control module 11. The control signal is used to control the work of the CH376 communication chip; the data information in the USB flash drive or the active hard disk is input to the CH376 communication chip through the data lines D- and D+ of the USB interface J ₂ , and the CH376 communication chip sends the message in the FPGA main control module 11 Under the control of the control signal, the reading of the data in the USB flash drive or the active hard disk is completed, and the data is sent to the FPGA main control module ₁₁ through eight data lines USB_DB0 _{- USB_DB7} ; The clock circuit provides the necessary clock signal for the CH376 communication chip.

As shown in Figure 7, the circuit structure of the high-voltage drive module 13 is that the DC _VCC -5V power supply is introduced through the power interface J3, and the DC 5V is raised to DC 12V through the MAX1771 chip and its standard configuration circuit, and then through the _TL494C chip And its standard preparation circuit converts it into a 12V square wave AC signal, and then boosts it to _a 154V AC signal through the transformer T1, and then rectifies and filters it through diodes D6, D7 and capacitor _C25 to become a _154V DC signal, and passes through the power interface _{J 4} output to the Braille point display screen 15 as power supply.

As shown in Figure 8, the circuit structure of the Braille dot matrix drive module 14 is, with DC D3V3B-3.3V and _VCC -5V as the power supply, the high-voltage control enable signal N5, control signal LE, clock The control signal CLK and the dot matrix signal DataOut are sent to the Braille dot display screen 15 through the interface _P3 after being photoelectrically isolated by the TLP521-8 chip.

As shown in Figure 9, the circuit structure of the function button module 12 is as follows: DC D3V3B-3.3V is used as the power supply, each function button is active at low level, and the five function buttons S3 _- S7 correspond to the left page turning key ₃ , Right page turning key 4, confirmation key 5, return directory key 6 and return home page key 7, and send information input to the GPIO first port 17 of FPGA master control module 11 respectively through interface J ₅ , thereby control FPGA master control module 11 to complete corresponding function.

As shown in Figures 1 and 10, the Braille dot display screen 15 is composed of 40 square dot display modules, each "square" is composed of six protruding and retractable bumps, and each Chinese character must have at least three " Square "braille to represent, and the braille bump control mechanism not only affects the normal expression of braille, and can affect the size of the braille display screen 15, and how much it contains braille.

In the present application, the structure of the Braille bump control mechanism in the various point display modules in the Braille point display screen 15 is, as shown in Figure 10 (a), the bump retraction state, (b) shows the bump protrusion state, with a rectangular parallelepiped shell 26, with a central guide hole 27 on its top plate, in the inner cavity of the shell 26, a "⊥" type top piece 28 matching the shell 26 and the central guide hole 27 is installed on the upper part, and the top piece 28 The supporting plate 29 is vertically installed with the ejector rod 30 which is matched with the central guide hole 27 and acts as a bump. Between the supporting plate 29 and the top plate of the shell 26, there is a supporting spring 34 which is enclosed within the ejector rod 30; Between the bottom of the supporting plate 29 of the top member 28 and the bottom plate of the shell 26, an ellipsoidal and elastic resin balloon 31 is fitted in a matching manner; On the wall, a double-membrane piezoelectric ceramic sheet 32 with the same specification and performance and next to the resin balloon 31 is respectively installed. The corresponding tail ends of the double-film piezoelectric ceramic sheet 32 pass through the insulating packaging layer on the bottom surface of the shell 26. After 35, the electrode 33 is externally drawn, and the electrode 33 is directly welded on the circuit board of the control circuit, or directly plugged into a corresponding slot on the circuit board of the control circuit.

Under the action of high-voltage electrical signals, as in the present application, the two double-membrane piezoelectric ceramic sheets 32 of DC 154V output by the high-voltage drive module 13 are deformed in a relative arc shape, thereby pressing the resin balloon 31 symmetrically along the short axis, and Make the resin balloon 31 elongate according to the long axis direction, thereby pushing up the supporting plate 29 upwards, and then compress the spring 34, and make the ejector rod 30 rise according to the central guide hole 27 and be exposed outside the top plate of the casing 25, forming a protrusion. When the low-voltage electric signal is received, the double-membrane piezoelectric ceramic sheet 32 returns to a flat state, thereby releasing the extrusion of the resin balloon 31, and the resin balloon 31 returns to its original state, and at the same time releases and lifts up the supporting plate 29 force, then under the action of the spring 34, the supporting plate 29 and the push rod 30 automatically return to the original position, that is, the convex point is formed to retract.

The Braille bump control mechanism is simple in structure, easy to manufacture, low in cost, strong in integrity, small in size, reliable in operation, fast in action, and strong in replaceability, which is beneficial for blind people to read quickly. setting, and two double-membrane piezoelectric ceramics work together, so the speed is fast and the space occupied is small. It is convenient to assemble multiple "square" display modules to form a multi-line or full-page braille display screen, which is convenient for blind readers. The ejector pin 30 that acts as a bump can also be called a bump.

As shown in Figure 11, the composition of software system is, the file input module 41 can realize the catalog management of the electronic book file in USB flash disk or active hard disk, the reading of file;

Since blind people read and comprehend by touching, in order to make some phrases that are closely combined in meaning be linked together for blind people to understand, it is necessary to perform word segmentation on Braille when converting Chinese characters to Braille. The word segmentation module 42 can divide and match the Chinese characters of input based on the word segmentation method of the dictionary, and add a space between each group of matched words;

The main function of Chinese character-phonetic conversion module 36 is to be read into the Chinese character internal code in the on-chip memory 19 successively and extract, then Chinese character is converted into corresponding phonetic text successively according to the Chinese character-phonetic conversion table that has done in advance;

Pinyin-Braille dot matrix conversion module 37 is to split the Chinese phonetic alphabet into initial consonants and final consonants, because in the Braille coding table, initial consonants and final consonants are separated, need to search respectively for the job, then set up two-dimensional array to store initial consonants and final consonants respectively Check the table, and then perform the conversion. After the conversion, separate the initials and finals with separators, and finally store the converted results in the buffer;

The data output module 38 sends the dot matrix data stored in the buffer, that is, the on-chip memory 19, to the Braille dot display screen 15 sequentially according to the size of one page of data, and displays Braille in different convex dot forms for reading.

The main control module 39 of the system can control the input of the system according to the difference of the function key signal 40 input by the function key.

The usage process of a portable braille reader:

1. Insert the USB flash drive or movable hard disk with text files (the suffixes are TXT) into the USB interface J2 _;

2. Turn on the external power switch S ₁ or the internal power switch S ₂ , the power indicator lights D ₁ and D ₃ are all on, the power is normal, and the system is initialized. At this time, the first file (e-book) will appear on the Braille display screen 15 ) file name (book title);

3. Press the left and right page turning keys 3 and 4, and the titles of electronic books stored in the USB flash drive or the removable hard disk will appear on the braille display screen 15 in turn. After selecting the book to be read, press the confirmation key 5;

4. The Braille dot matrix information of the first page of the selected book appears on the Braille dot display screen 15, which can be read by touching with both hands. After reading the information on this page, press the right page turning key 4 to proceed to the next page. Page reading, if you want to go back to read the information on the previous page, you can press the left page turning key 3;

5. If you want to go back to the first page of the book for rereading, press the return home button 7, and then the braille information on the first page of the book will be redisplayed on the braille display screen 15;

6. If you want to return to the catalog and reselect the electronic book, press the return catalog key 6, then the name of the first electronic book will be displayed again on the Braille display screen 15, and you can start from the new book by operating as described in "3" above. Choose the book you want to read; use it repeatedly like this;

7. Turn off the external power switch S ₁ or the internal power switch S ₂ after use, and remove the USB flash drive or movable hard disk.

Claims (9)

1. a kind of portable braille reader, there is external power socket, outer, interior power switch, power supply to refer to casing, on casing Show the aobvious screen of lamp, air grid, USB interface, function button and braille point, casing is built with corresponding hardware system and lithium Battery, it is characterised in that：The structure of hardware system constitutes as follows by seven modules, and power management module is will be external After the DC voltage that the DC voltage or lithium battery that 220V alternating voltage adapters are provided are provided is through treatment, provide a system to steady Fixed direct current Vcc-5V and D3V3B-3.3V power supply；Usb communication module is to receive the control signal that FPGA main control modules are sent, and is read The information in the flash disk or disk cartridge in the system of being plugged on is taken, and the data message in flash disk or disk cartridge is passed through into USB Communication module is transmitted to FPGA main control modules；Function button module is that blind person is sent out by corresponding function button to FPGA main control modules Corresponding control signal is sent, so as to control FPGA main control modules to complete corresponding function, function button includes that left page turning key, the right side are turned over Page key, determination key, Returning catalogue key and the key that returns to the homepage；FPGA main control modules according to the function button signal for receiving, to USB Communication module sends corresponding control signal, and control usb communication module reads the information in flash disk or disk cartridge, is receiving After the data message that usb communication module sends, by data message by Chinese character participle, the conversion of Chinese character-braille and braille-blind After the treatment such as literary lattice information conversion, braille lattice information is obtained, then braille lattice information is sent to serial data form Braille lattice driver module；High drive module is after the direct current 5V power supply signals for providing power management module are changed, to blind The aobvious screen of text point provides a high voltage power supply signal of direct current 154V；Braille lattice driver module is then to receive FPGA main control modules hair The corresponding braille lattice information data sent and corresponding control signal, are sent to the aobvious screen of braille point, control after Phototube Coupling The corresponding salient point action that braille point shows in screen in corresponding braille salient point controlling organization completes Braille reading function；The aobvious screen of braille point Be made up of the aobvious module of 40 side's points, the direct current 154V provided with high drive module as power supply, what braille lattice driver module sent Braille lattice information is sent in each aobvious module of point after being changed in the lump through string, drives salient point action.

2. a kind of portable braille reader according to claim 1, it is characterised in that：The knot of FPGA main control modules (11) Structure is that the core of the FPGA main control modules (11) is the EP4CE15 chips of altera corp, is existed by SOPC technologies Constructed with NIOSII microprocessors (16), GPIO first ports (17), the ends of GPIO second using the soft cores of IP in EP4CE15 chips The system core Kernei of mouth (18), on-chip memory (19), IATG-UART communication interfaces (20) and EPCS controllers (21) composition And phase-locked loop module (22)；EPCS serial storagies (23) are the configuration chips of FPGA main control modules (11), main storage system System program, and complete to be communicated with the middle EP4CE15 chip datas of FPGA main control modules (11) by EPCS controllers (21), upper electricity Afterwards, the configuration data that system will be stored in EPCS serial storagies (23) automatically is loaded into FPGA main control modules (11) In EP4CE15 chips；GPIO first ports (17) receive the key information of function button module (12) transmission, GPIO second ports (18) information interchange is carried out with usb communication module (10), receives the data message that usb communication module (10) sends, while to Usb communication module (10) sends control information；Ephemeral data in on-chip memory (19) storage program running；Clock mould Block (24) provides 25MH for system_ZClock signal, provide one through backward NIOSII microprocessors (16) of phaselocked loop (22) 100MH_ZClock signal；NIOSII microprocessors (16) executive system routine, realizes to the file of flash disk or disk cartridge Reading, Chinese character participle, the conversion of Chinese character-braille and the output of braille lattice information, debugging interface (25) for system debug and During system program downloaded into EPCS serial storagies (23).

3. a kind of portable braille reader according to claim 1 and 2, it is characterised in that：Usb communication module (10) Circuit structure is, with direct current D3V3B-3.3V as power supply, using the CH376 communication chips of eight BITBUS network patterns, with FPGA master controls Have 12 lines between the EP4CE15 chips of module (11) to be connected, wherein eight data lines USB_DB0-USB_DB7 are used to incite somebody to action The data message that CH376 communication chips read is sent to FPGA main control modules (11), four control line USB_WR, USB_RD, USB_AO and USB_INT are to transmit the control signal that FPGA main control modules (11) is produced and sent, for controlling CH376 communication cores The work of piece；Data message in flash disk or disk cartridge passes through USB interface J₂Data wire D-, D+ input to CH376 communication Chip, CH376 communication chips complete hard to flash disk or activity under the control of the control signal that FPGA main control modules (11) send The reading of the data in disk, and send the data to FPGA main control modules (11) by eight data lines USB_DB0-USB_DB7； Electric capacity C₁₀、C₁₁And 12MH_ZCrystal oscillator Y₁Clock signal necessary to the clock circuit offer CH376 communication chips of composition；

The circuit structure of high drive module (13) is that direct current Vcc-5V power supplys are through power interface J₃Introduce, by MAX1771 cores Direct current 5V is raised to direct current 12V by piece and its standard configuration circuit, afterwards, then is turned by TL494C chips and its standard preparation circuit 12V square wave AC signals are changed to, 154V AC signals are boosted to by transformer T1 again afterwards, then pass through diode D₆、D₇And Electric capacity C₂₅Rectifying and wave-filtering turns into 154V direct current signals, and by power interface J₄Export and make power supply to the aobvious screen (15) of braille point；

The circuit structure of braille lattice driver module (14) is, with direct current D3V3B-3.3V and Vcc-5V as power supply, FPGA master controls The high voltage control that module (11) sends enables signal N₅, control signal LE, clock control signal CLK and dot matrix signal DataOut, After isolating through TLP521-8 chip photos, through interface P₃It is sent to the aobvious screen (15) of braille point；

The circuit structure of function button module (12) is, with direct current D3V3B-3.3V as power supply, each function button Low level effective, Five function button S₃~S₇Correspond respectively to left page turning key (3), right page turning key (4), determination key (5), Returning catalogue key (6) and Return to the homepage key (7), and passes through interface J respectively₅Send information input to the GPIO first ports of FPGA main control modules (11) (17), so as to control FPGA main control modules (11) to complete corresponding function.

4. a kind of portable braille reader according to claim 1 and 2, it is characterised in that：Power management module (9) Circuit structure is that 220V is exchanged after external power changes into direct current 5V through adapter through external power socket J₁- i.e. external power socket (2) connects Enter, external power socket J₁Diode D is housed afterwards₂, short-circuit protection is carried out, direct current 5V lithium batteries interior power is through interior power interface P₁ Access, outward, interior power respectively pass through dispatch from foreign news agency source switch S₁S is switched with interior power₂It is connected in parallel, through self- recoverage protective tube F₂And After filtering, exported as direct current Vcc-5V；Vcc-5V is directly output to high drive module (13) all the way, and has LED to make electricity Source indicator lamp D₁, separately have all the way Vcc-5V through self- recoverage protective tube F₁Afterwards, direct current D3V3B- is switched to by LM1117S-3.3 chips 3.3V, exports to FPGA main control modules (11) and other corresponding modules, and has LED to make power supply indicator D₂。

5. a kind of portable braille reader according to claim 3, it is characterised in that：The electricity of power management module (9) Line structure is that 220V is exchanged after external power changes into direct current 5V through adapter through external power socket J₁- i.e. external power socket (2) connects Enter, external power socket J₁Diode D is housed afterwards₂, short-circuit protection is carried out, direct current 5V lithium batteries interior power is through interior power interface P₁ Access, outward, interior power respectively pass through dispatch from foreign news agency source switch S₁S is switched with interior power₂It is connected in parallel, through self- recoverage protective tube F₂And After filtering, exported as direct current Vcc-5V；Vcc-5V is directly output to high drive module (13) all the way, and has LED to make electricity Source indicator lamp D₁, separately have all the way Vcc-5V through self- recoverage protective tube F₁Afterwards, direct current D3V3B- is switched to by LM1117S-3.3 chips 3.3V, exports to FPGA main control modules (11) and other corresponding modules, and has LED to make power supply indicator D₂。

6. a kind of portable braille reader according to claim 1 and 2, it is characterised in that：In the aobvious screen (15) of braille point The aobvious module of each side's point in the structure of braille salient point controlling organization be that the shell (26) with cuboid-type has on its top board There is central guide bore (27), in the inner chamber of shell (26), top is equipped with " ⊥ " type supporting with shell (26) and central guide bore (27) Head part (28) is vertical on the supporting plate (29) of head part (28) to be fixed with supporting with central guide bore (27) and play the push rod of salient point (30), between the top board of supporting plate (29) and shell (26), be enclosed within push rod (30) with sleeve spring (34)；Adjacent head part (28) below supporting plate (29) and the base plate of shell (26) between, auxiliary type is in spheroid shape equipped with one and has resilient tree Fat sacculus (31)；It is close on two side walls relative with the inner chamber of shell (26), it is respectively the same simultaneously equipped with a block specifications performance And it is close to double film type piezoelectric potsherds (32) of resin sacculus (31), the corresponding tail end warp of double film type piezoelectric potsherds (32) After the insulating sealed layer (35) of the bottom surface of shell (26), external extraction electrode (33), electrode (33) is directly welded at control electricity On the circuit board on road, or directly it is plugged in the associated socket on the circuit board of control circuit.

7. a kind of portable braille reader according to claim 3, it is characterised in that：It is each in the aobvious screen (15) of braille point The structure of the braille salient point controlling organization in side's aobvious module of point is, the shell (26) with cuboid-type, in having on its top board Centre guide hole (27), in the inner chamber of shell (26), top is equipped with " ⊥ " type head part supporting with shell (26) and central guide bore (27) (28) it is, vertical on the supporting plate (29) of head part (28) to be fixed with supporting with central guide bore (27) and play the push rod of salient point (30), between the top board of supporting plate (29) and shell (26), be enclosed within push rod (30) with sleeve spring (34)；Adjacent head part (28) below supporting plate (29) and the base plate of shell (26) between, auxiliary type is in spheroid shape equipped with one and has resilient tree Fat sacculus (31)；It is close on two side walls relative with the inner chamber of shell (26), it is respectively the same simultaneously equipped with a block specifications performance And it is close to double film type piezoelectric potsherds (32) of resin sacculus (31), the corresponding tail end warp of double film type piezoelectric potsherds (32) After the insulating sealed layer (35) of the bottom surface of shell (26), external extraction electrode (33), electrode (33) is directly welded at control electricity On the circuit board on road, or directly it is plugged in the associated socket on the circuit board of control circuit.

8. a kind of portable braille reader according to claim 4, it is characterised in that：It is each in the aobvious screen (15) of braille point The structure of the braille salient point controlling organization in side's aobvious module of point is, the shell (26) with cuboid-type, in having on its top board Centre guide hole (27), in the inner chamber of shell (26), top is equipped with " ⊥ " type head part supporting with shell (26) and central guide bore (27) (28) it is, vertical on the supporting plate (29) of head part (28) to be fixed with supporting with central guide bore (27) and play the push rod of salient point (30), between the top board of supporting plate (29) and shell (26), be enclosed within push rod (30) with sleeve spring (34)；Adjacent head part (28) below supporting plate (29) and the base plate of shell (26) between, auxiliary type is in spheroid shape equipped with one and has resilient tree Fat sacculus (31)；It is close on two side walls relative with the inner chamber of shell (26), it is respectively the same simultaneously equipped with a block specifications performance And it is close to double film type piezoelectric potsherds (32) of resin sacculus (31), the corresponding tail end warp of double film type piezoelectric potsherds (32) After the insulating sealed layer (35) of the bottom surface of shell (26), external extraction electrode (33), electrode (33) is directly welded at control electricity On the circuit board on road, or directly it is plugged in the associated socket on the circuit board of control circuit.

9. a kind of portable braille reader according to claim 5, it is characterised in that：It is each in the aobvious screen (15) of braille point The structure of the braille salient point controlling organization in side's aobvious module of point is, the shell (26) with cuboid-type, in having on its top board Centre guide hole (27), in the inner chamber of shell (26), top is equipped with " ⊥ " type head part supporting with shell (26) and central guide bore (27) (28) it is, vertical on the supporting plate (29) of head part (28) to be fixed with supporting with central guide bore (27) and play the push rod of salient point (30), between the top board of supporting plate (29) and shell (26), be enclosed within push rod (30) with sleeve spring (34)；Adjacent head part (28) below supporting plate (29) and the base plate of shell (26) between, auxiliary type is in spheroid shape equipped with one and has resilient tree Fat sacculus (31)；It is close on two side walls relative with the inner chamber of shell (26), it is respectively the same simultaneously equipped with a block specifications performance And it is close to double film type piezoelectric potsherds (32) of resin sacculus (31), the corresponding tail end warp of double film type piezoelectric potsherds (32) After the insulating sealed layer (35) of the bottom surface of shell (26), external extraction electrode (33), electrode (33) is directly welded at control electricity On the circuit board on road, or directly it is plugged in the associated socket on the circuit board of control circuit.