JP3917950B2 - Communication terminal device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention displays information such as Braille with a plurality of protrusions that can advance or retract by the driving force of an ultrasonic motor.Mobile terminal deviceAbout.
[0002]
[Prior art]
  2. Description of the Related Art Conventionally, portable information terminal devices such as mobile phones and PHS that can display braille are known. In this portable information terminal device, a permanent magnet is connected to a Braille convex portion as a display member. The permanent magnet is disposed so that an electromagnet formed of an iron core and a coil faces each other, and applies an attractive force or a repulsive force according to the energized state. When the Braille convex portion is in the protruding state, the locking member is fitted into the concave portion of the permanent magnet, and the permanent magnet is locked. When the coil is energized and an attractive force is generated in the permanent magnet, the locking member is released from the recess. When the coil is energized so that a repulsive force is generated in the permanent magnet, the Braille convex portion is pushed up and protrudes from the housing surface, and the locking member is fitted into the concave portion to lock the permanent magnet. In this manner, the Braille protrusions for displaying Braille are projected or retracted.
[0003]
[Patent Document 1]
          JP 2002-156898 A
[Patent Document 2]
          JP 2001-331249 A
[Problems to be solved by the invention]
  However, in the above-described portable information terminal device, since a permanent magnet, an electromagnet including an iron core and a coil, and the like are used, it is not easy to reduce the size and weight. If the size cannot be reduced, the amount of braille data that can be displayed at one time in the area where braille is displayed is reduced, and convenience is lacking. Recently, data broadcasting has been carried out in digital broadcasting, but it is desired to reduce the size of an active Braille display, which is a receiving terminal device for visually impaired people. In order to realize this, a linear actuator (ultrasonic motor) that is small, has high output, and has high controllability is required.
[0004]
  The present invention is provided with a plurality of protrusions that can be advanced or retracted by the driving force of an ultrasonic motor, is small, and can display a large amount of braille data and the like.Mobile terminal deviceThe purpose is to provide.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, the present invention takes the following measures. That is, the mobile terminal device of the present invention includes a communication unit that transmits and receives data, a conversion unit that converts character data received by the communication unit into Braille data, an electrostrictive material formed in a plate shape, and the electrostriction A first electrode provided on one surface of the material, provided on the first electrode;The first electrode has a cross-sectional shape in which the central vertex is supported from two different directions.Protruding structure, and provided on the other surface of the electrostrictive material,vertexA Braille unit having a plurality of protrusions that can be advanced or retracted by the driving force of an ultrasonic motor composed of second electrodes divided at positions facing each other, the Braille unit based on the Braille data AndBy transmitting an elliptical motion to the apex of the protrusion structure, the driving force is transmitted to each protrusion.It is characterized by showing Braille by advancing or retracting each protrusion.
[0006]
  In this way, since the projection of the Braille unit is advanced or retracted using the driving force of the ultrasonic motor, the advance / retreat mechanism of each projection can be miniaturized and a large amount of Braille data can be displayed at once. Become. In addition, since the ultrasonic motor has high controllability, it is possible to accurately represent the braille data. Furthermore, the recent increase in data transfer speed tends to increase the amount of data received per unit time. However, according to the present invention, the display speed of the braille data is increased, so that the braille data is received in real time. It is possible to display. Further, since the ultrasonic motor does not use windings or magnets as a driving source but uses ultrasonic vibration as a driving source, it does not generate magnetism. For this reason, even in a high magnetic field, it operates accurately without being affected by magnetism. Further, since no magnetism is generated, there is no influence on data transmission / reception by wireless communication. Further, since no winding is used, a simple configuration can be adopted, and the weight and cost can be reduced.In addition, each of the divided second electrodes has a phase of 90 deg. When a shifted sine voltage is applied, the electrostrictive material undergoes flexural deformation, and the apex of the protruding structure performs an elliptical motion.
[0007]
  In addition, the present inventionMobile terminal deviceA data storage unit for storing the received character data or the converted braille data, and reading the braille data from the data storage unit for each amount of braille data that the braille unit can display at a time. And a controller for outputting to the unit.
[0008]
  Thus, since the Braille data is read from the data storage unit and output to the Braille unit for each amount of Braille data that can be displayed at one time, the Braille data can be displayed in units of pages. Thereby, the convenience can be improved.
[0009]
  Moreover, the portable terminal device of the present invention includes a communication unit that transmits and receives three-dimensional data including at least uneven information.Further comprisingThe Braille unit displays the three-dimensional data three-dimensionally by advancing or retracting the protrusions based on the three-dimensional data.
[0010]
  In this way, since the driving force of the ultrasonic motor is used to advance or retract each protrusion in the braille unit by the advance amount corresponding to the position, the advance / retreat mechanism of each protrusion is miniaturized and a large amount of data is obtained at once. Can be displayed. The three-dimensional data includes, for example, map data having contour lines, weather map data having isobars, and the like. Since these three-dimensional data are displayed three-dimensionally, the user can recognize the data by touching each protrusion and feeling unevenness. Since this ultrasonic motor has high controllability, it is possible to accurately express three-dimensional data by adjusting the amount of protrusion advancement. Furthermore, the recent increase in data transfer speed tends to increase the amount of data received per unit time. However, according to the present invention, since the display speed of three-dimensional data is increased, three-dimensional data is real-time. Data can be displayed. Further, since the ultrasonic motor does not use windings or magnets as a driving source but uses ultrasonic vibration as a driving source, it does not generate magnetism. For this reason, even in a high magnetic field, it operates accurately without being affected by magnetism. Further, since no magnetism is generated, there is no influence on data transmission / reception by wireless communication. Further, since no winding is used, a simple configuration can be adopted, and the weight and cost can be reduced.
[0011]
  In addition, the present inventionMobile terminal deviceEach of the protrusions is supported by the protrusion structure in the plurality of ultrasonic motors,Applying a sinusoidal voltage whose phase is shifted by 90 degrees to each of the second electrodes and causing the tip of the protrusion structure to move elliptically, the driving force is transmitted to the protrusions to advance the protrusions. Or evacuateIt is characterized by that.
[0012]
  In this way, each protrusionProtrusion structureAre sandwiched by a pair of ultrasonic motors arranged so as to face each other, so that the number of contact points with the projections as the transported object increases, and as a result, the frictional force increases to increase the output and controllability. It becomes possible to make it higher. Also,Each divided second electrode has a phase of 90 deg. By applying a shifted sine voltage, the electrostrictive material is deformed flexibly, and the apex of the protruding structure performs an elliptical motion. Thereby, position holding and control characteristics are improved.
[0013]
  In addition, the present inventionMobile terminal deviceIs characterized in that the protruding structure is made of phosphor bronze.
[0014]
  in this way,Protrusion structureHowever, since it is made of non-magnetic phosphor bronze, it can be operated without being affected by magnetism. That is, since the ultrasonic motor operates without being affected by magnetism, phosphor bronze which is a non-magnetic material is a suitable material in order to maintain this characteristic. This avoids both generating magnetism during operation and being affected by magnetism.
[0015]
  In addition, the present inventionMobile terminal deviceIs characterized by further comprising a display unit for displaying the image data or the character data so as to be visible.
[0016]
  Thus, since the display unit is provided in addition to the Braille unit, it is possible to display image data and character data. The display unit is configured by, for example, a liquid crystal display or an organic EL display. For example, when applied to a mobile phone, a liquid crystal display can be provided on the same side as the operation buttons, and a braille unit can be arranged on the back side. This makes it possible to display image data and character data in addition to Braille data and three-dimensional data.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments when the present invention is applied to a mobile phone will be described below with reference to the drawings. As shown in FIG. 1, the mobile phone 1 is provided with a braille display portion 3 and a plurality of operation buttons 4 in a housing 2 formed of metal, plastic, or the like. This Braille display unit 3 can express Braille data in six areas. Further, a speaker 5 that outputs voice information as a telephone and a microphone 6 that inputs a user's voice are provided. Furthermore, an antenna 7 for transmitting and receiving data wirelessly is provided. In the present embodiment, the braille display unit 3 is provided on the same side as the operation button 4, and a liquid crystal display unit for displaying image data and character data is provided on the back side of the housing 2. To do. However, the liquid crystal display unit may be provided on the same side as the operation button 4 and the braille display unit 3 may be provided on the back side of the housing 2 as in a generally known mobile phone.
[0018]
  FIG. 2 is a block diagram showing an electrical configuration of the mobile phone 1 according to the present embodiment. The control unit 20 controls data input and output, program execution, and operation of each component in the mobile phone 1. The control unit 20 exchanges data with each component via the control bus 20a. Then, the control unit 20 converts the character data received by the communication interface 22 into Braille data and stores it in the memory 21. The memory 21 stores programs and data, and outputs the stored programs and data in response to a request from the control unit 20. The communication interface 22 performs wireless communication to transmit and receive data. The input unit 23 includes an operation button 4 and a microphone 6 and receives an input of a signal from the operation button 4 and an input of an audio signal from the microphone 6. The power supply unit 24 includes, for example, a battery and supplies power to each component.
[0019]
  The data input / output interface 25 has a connection terminal at the tip, and inputs and outputs data by being connected to an information terminal device such as a computer. The audio output unit 26 includes a speaker 5 and outputs audio data as an audible sound. The image display unit 27 is configured by a liquid crystal display, for example, and displays image data and character data.
[0020]
  The braille unit 28 includes a plurality of protrusions that can be advanced or retracted by the driving force of the ultrasonic motor, and displays the braille by retracting or retracting each protrusion based on the braille data. Hereinafter, the Braille unit 28 will be described.
[0021]
  The braille unit 28 converts the braille data as an electrical signal into mechanical protrusion displacement, and displays the braille on the braille display unit 3. The braille display unit 3 is composed of six braille display areas 30a. FIG. 3 is a perspective view showing a part of the braille display unit 3. As shown in FIG. 3, the protrusions 30 are arranged in 3 rows × 2 columns at intervals of 1.2 mm on each braille display area 30a, and the diameter of the tip portion of the protrusion 30 is 1.2 mm.
[0022]
  FIG. 4 is a cross-sectional view showing an actuator structure for advancing or retracting each protrusion 30. As shown in FIG. 4, the actuator structure corresponding to each protrusion 30 has a width, thickness and length of about 1 mm. Thereby, the six protrusions 30 can be provided in the Braille display area 30a, and the Braille display portion can be reduced in size. As a result, a portable terminal having a braille display portion can be realized.
[0023]
  The protrusion 30 is integrated with the slider 31, and a configuration in which the protrusion 30 is provided at the tip of the slider 31 is employed. The slider 31 is in contact with the tip of the triangular protrusion structure 33 of the piezoelectric linear actuator 100 and is supported by the opposing triangular protrusion structure 33 of the piezoelectric linear actuator 100. Each triangular projection structure 33 has a function of performing a traveling wave-like elliptical motion by the displacement of the piezoelectric element 32 and moving the slider 31 to advance or retract the projection 30. Each piezoelectric linear actuator 100 has a structure in which a triangular protrusion structure 33 is mounted on a single piezoelectric element 32 whose entire surface is polarized in the thickness direction. As described above, since a plurality of polarization portions are not formed on one piezoelectric element, stress is not partially concentrated and cracks or the like do not occur. As a result, the manufacturing cost can be reduced. Further, since the configuration of the piezoelectric linear actuator 100 is simple, it is easy to reduce the size.
[0024]
  In addition, since the tip portion of the triangular protrusion structure 33 is in contact with the slider 31, the number of contact points with the slider 31 is increased by providing a structure in which a large number of triangular protrusion structures 33 are attached. Can be realized.
[0025]
  FIG. 5 is a perspective view showing the overall structure of the piezoelectric linear actuator 100 alone. As shown in FIG. 5, in the piezoelectric linear actuator 100, electrodes 35 are provided on both surfaces of a rectangular plate-shaped single-plate piezoelectric element 32, and a triangular projection structure 33 having a reverse V-shaped cross section on one upper surface thereof. Several are attached. As a result, the contact point between the triangular protrusion structure 33 and the slider 31 in the actuator increases and the contact area increases, so that a frictional force can be gained. As a result, it is possible to realize a small actuator that can stably obtain a high output. The lower electrode to which the triangular protrusion structure 33 is not attached has a structure in which the lower electrode is divided immediately below the apex of each triangle. The piezoelectric element 32 constitutes an electrostrictive material, the electrode 35 to which the triangular protrusion structure 33 is attached constitutes a first electrode, and the electrode 35 to which the triangular protrusion structure 33 is not attached constitutes a second electrode.
[0026]
  In the present embodiment, the triangular protrusion structure 33 is made of non-magnetic phosphor bronze. Thereby, since the triangular protrusion structure 33 is not affected by magnetism, the protrusion 30 can be advanced or retracted without being influenced by magnetism even in a high magnetic field. In particular, when used for a part of a portable terminal, the operation is not affected by the reception of data by wireless communication. In addition, if it is a nonmagnetic material, the same effect can be acquired not only in phosphor bronze.
[0027]
  In the present embodiment, lead zirconate titanate (PZT) is used as the material of the single plate piezoelectric element 32. PZT is a solid solution of ferroelectric PbTiO3 and antiferroelectric PbZrO3, and is usually expressed as Pb (Zr, Ti) O3. The Curie point differs depending on the mixing ratio of both, and is around 320 ° C., but PZT can be used stably because it does not have a transition point at a temperature from room temperature to the Curie point. Further, PZT has good sinterability and is relatively easy to polarize and can be sufficiently polarized. Therefore, it is possible to produce a piezoelectric material having an excellent piezoelectric constant.
[0028]
  It is also possible to control the mechanical Q, dielectric constant, etc. by changing the mixing ratio of PbTiO3 and PbZrO3, adding an additive, or adding a third component.
[0029]
  In addition to PZT, the material of the piezoelectric element 32 is quartz (SiO2), lithium niobate (LiNbO3), barium titanate (BaTiO3), lead titanate (PbTiO3), lead metaniobate (PbNb2O6), polyvinylidene fluoride (PVDF) or the like can also be used.
[0030]
  6A is a top view of the piezoelectric linear actuator 100, FIG. 6B is a side view of the piezoelectric linear actuator 100, FIG. 6C is a bottom view of the piezoelectric linear actuator 100, and FIG. 6D is a right side view of the piezoelectric linear actuator 100. It is. The piezoelectric element 32 is entirely polarized in the thickness direction as shown in FIG. As shown in FIG. 6, electrodes 35 are provided on both sides of a rectangular plate-shaped single-plate piezoelectric element 32, one of which is electrically grounded, and a plurality of triangular protrusion structures 33 are attached to the upper surface thereof. Yes. The lower electrode to which the triangular protrusion structure 33 is not attached has a structure in which the lower electrode is divided immediately below the apex of each triangle, and the divided electrodes have a phase of 90 deg. A shifted sine voltage is applied. As a result, the piezoelectric element 32 is flexibly deformed, and the apex of the triangular protrusion structure 33 performs an elliptical motion. Thereby, position holding and control characteristics are improved.
[0031]
  FIG. 7 is a diagram illustrating the operation principle of the piezoelectric linear actuator 100 according to the present embodiment, and FIG. 8 is a diagram illustrating the operation of the single triangular protrusion structure 33 specified by α in FIG. FIG. 9 is a diagram illustrating the state of the piezoelectric linear actuator 100 over time, with the time being shifted every quarter period. As described above, the phases of the divided lower electrodes are 90 deg. By applying the shifted sine voltage, the piezoelectric element 32 is flexibly deformed. As a result, the tip of the triangular protrusion structure can be elliptically moved, and this elliptical motion is transmitted to the slider through the frictional force between the tip of the triangular protrusion structure and the slider, so that the slider is moved in a certain direction. be able to. As shown in FIG. 9, since the phases of the elliptical motions of the triangular protrusion structures adjacent to each other are shifted, one of the many triangular protrusion structures always comes into contact with the slider, thereby realizing a stable linear operation. it can.
[0032]
  In this way, since the projection of the Braille unit is advanced or retracted using the driving force of the ultrasonic motor, the advance / retreat mechanism of each projection can be miniaturized and a large amount of Braille data can be displayed at once. Become. In addition, since the ultrasonic motor has high controllability, it is possible to accurately represent the braille data. Further, since the ultrasonic motor does not use windings or magnets as a driving source but uses ultrasonic vibration as a driving source, it does not generate magnetism. For this reason, even in a high magnetic field, it operates accurately without being affected by magnetism. Further, since no magnetism is generated, there is no influence on data transmission / reception by wireless communication. Further, since no winding is used, a simple configuration can be adopted, and the weight and cost can be reduced.
[0033]
  Next, the operation of the mobile phone 1 according to the present embodiment configured as described above will be described with reference to the flowchart shown in FIG. First, the cellular phone 1 determines in the control unit 20 whether or not the communication interface 22 has received data (step S1). Here, the data includes image data and character data that can be downloaded from the Internet, character data obtained by receiving an e-mail, and the like. In step S1, if data is not received, this determination is repeated. If data is received, the data is stored in the memory 21 (step S2). Next, it is determined whether to output braille data (step S3). If no braille data is output, the process ends. Here, it may be set in advance to output Braille data by the operation of the operation button 4 by the user, or the Braille data may be automatically output.
[0034]
  In step S3, when outputting Braille data, the control part 20 reads the data received from the memory 21, and converts it into Braille data (step S4). The process of converting the received data into Braille data can be performed by an existing application. Next, the control unit 20 converts the converted braille data into address data and outputs it to the braille unit 28 (step S5). The braille unit 28 displays the braille based on the address data input from the control unit 20 (step S6). For example, as shown in FIG. 11, it is assumed that the Braille display unit 3 in the Braille unit 28 can express Braille data in six areas A to F. Then, “Aiueo” is displayed in the order of A to F. Further, in the Braille unit 28, each protrusion is retracted in the standby state, and the protrusion to which the “ON” signal is input is advanced. When the “OFF” signal is input to the advanced protrusion, the protrusion is retracted.
[0035]
  When converting the braille data into address data, the control unit 20 outputs an “ON” signal to be input to the braille unit 28 as address data in matrix representation. For example, when braille data corresponding to “A” is expressed in the area A, an “ON” signal is output to (A, 1, 1). When the braille data corresponding to “I” is expressed in the area B, (B, 1, 1) (B,2, “1” outputs an “ON” signal. Similarly, when braille data corresponding to “U” is expressed in the area C, an “ON” signal is output to (C, 1, 1) (C, 1, 2). When the braille data corresponding to “e” is expressed in the area D, an “ON” signal is output to (D, 1, 1) (D, 2, 1) (D, 1, 2). When the braille data corresponding to “O” is expressed in the area E, an “ON” signal is output to (E, 2,1) (E, 1,2). Finally, when the braille data corresponding to “A” is expressed in the area F, an “ON” signal is output to (F, 1, 1). The protrusion to which the “ON” signal is input advances, and the other protrusions are kept retracted. As a result, it is possible to represent the braille data in the braille unit 28.
[0036]
  In step S6, when the braille data is displayed, it is determined whether or not to change the page (step S7). That is, the control unit 20 outputs data that can be displayed in the six areas A to F as one page. For example, when the user operates a button for turning or returning a page, the page can be changed. If the page is not changed, the display of the braille data in step S6 is maintained. If the page is changed, the process proceeds to step S4. In step S4, the received data is read from the memory 21 and converted into Braille data each time. However, the received data is converted into Braille data at the received stage, and the converted Braille data is stored in the memory 21. You may make it read as needed.
[0037]
  Note that the present invention is not limited to the above-described method of converting Braille data into address data and outputting the address data to the Braille unit, and any method of expressing Braille based on received data can be applied.
[0038]
  In this embodiment, braille display has been described. For example, the display unit can be adjusted by adjusting the amount of protrusion of three-dimensional data such as map data having contour lines and weather map data having isobars. Can also be displayed. In that case, the protrusion amount of the protrusion and the address data in the matrix representation are expressed in the same manner as described above in the three-dimensional data format (X, Y, Z), and the protrusion at the position (X, Y) is the amount of protrusion of Z Only to advance. As a result, not only braille but also three-dimensional data such as map data having contour lines and weather map data having isobars is displayed three-dimensionally, so that the user can feel unevenness by touching each protrusion. Can recognize data. Since this ultrasonic motor has high controllability, it is possible to accurately express three-dimensional data by adjusting the amount of protrusion advancement. Furthermore, the recent increase in data transfer speed tends to increase the amount of data received per unit time. However, according to the present invention, since the display speed of three-dimensional data is increased, three-dimensional data is real-time. Data can be displayed. Further, since the ultrasonic motor does not use windings or magnets as a driving source but uses ultrasonic vibration as a driving source, it does not generate magnetism. For this reason, even in a high magnetic field, it operates accurately without being affected by magnetism. Further, since no magnetism is generated, there is no influence on data transmission / reception by wireless communication. Further, since no winding is used, a simple configuration can be adopted, and the weight and cost can be reduced.
[0039]
【The invention's effect】
  As described above, according to the present invention, since the projections in the braille unit are advanced or retracted using the driving force of the ultrasonic motor, the advance / retreat mechanism of each projection is reduced in size, and a large amount of braille data is obtained at one time. Can be displayed. In addition, since the ultrasonic motor has high controllability, it is possible to accurately represent the braille data. Furthermore, the recent increase in data transfer speed tends to increase the amount of data received per unit time. However, according to the present invention, the display speed of the braille data is increased, so that the braille data is received in real time. It is possible to display. Further, since the ultrasonic motor does not use windings or magnets as a driving source but uses ultrasonic vibration as a driving source, it does not generate magnetism. For this reason, even in a high magnetic field, it operates accurately without being affected by magnetism. Further, since no magnetism is generated, there is no influence on data transmission / reception by wireless communication. Further, since no winding is used, a simple configuration can be adopted, and the weight and cost can be reduced.In addition, each of the divided second electrodes has a phase of 90 deg. When a shifted sine voltage is applied, the electrostrictive material undergoes flexural deformation, and the apex of the protruding structure performs an elliptical motion.
[0040]
  In addition, since the Braille data is read from the data storage unit and output to the Braille unit for each amount of Braille data that can be displayed at one time, the Braille data can be displayed in units of pages. Thereby, the convenience can be improved.
[0041]
  In addition, three-dimensional data can be expressed. The three-dimensional data includes, for example, map data having contour lines, weather map data having isobars, and the like. Since these three-dimensional data are displayed three-dimensionally, the user can recognize the data by touching each protrusion and feeling unevenness. Since this ultrasonic motor has high controllability, it is possible to accurately represent three-dimensional data. Furthermore, the recent increase in data transfer speed tends to increase the amount of data received per unit time. However, according to the present invention, since the display speed of three-dimensional data is increased, three-dimensional data is real-time. Data can be displayed.
[0042]
  In addition, each protrusionProtrusion structureAre sandwiched by a pair of ultrasonic motors arranged so as to face each other, so that the number of contact points with the projections as the transported object increases, and as a result, the frictional force increases to increase the output and controllability. It becomes possible to make it higher. Also,Each divided second electrode has a phase of 90 deg. By applying a shifted sine voltage, the electrostrictive material is deformed flexibly, and the apex of the protruding structure performs an elliptical motion. Thereby, position holding and control characteristics are improved.
[0043]
  Also,Protrusion structureHowever, since it is made of non-magnetic phosphor bronze, it can be operated without being affected by magnetism. Phosphor bronze is a suitable material because it has a feature that an ultrasonic motor has no magnetic action.
[0044]
  In addition to the braille unit, a display unit is provided, so that image data and character data can be displayed. This display part is comprised by a liquid crystal display, an organic EL display, etc., for example. For example, when applied to a mobile phone, a liquid crystal display can be provided on the same side as the operation buttons, and a braille unit can be arranged on the back side. This makes it possible to display image data and character data in addition to Braille data and three-dimensional data.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a mobile phone according to an embodiment of the present invention.
FIG. 2 is a block diagram showing an electrical configuration of the mobile phone according to the present embodiment
FIG. 3 is a perspective view showing a part of a Braille display unit.
FIG. 4 is a sectional view showing an actuator structure.
FIG. 5 is a perspective view showing the overall structure of a single piezoelectric linear actuator.
FIG. 6A is a top view of the piezoelectric linear actuator.
(B) Side view of piezoelectric linear actuator
(C) Bottom view of piezoelectric linear actuator
(D) Right side view of the piezoelectric linear actuator
FIG. 7 is a diagram showing the operating principle of a piezoelectric linear actuator.
FIG. 8 is a diagram showing the operation of a single triangular protrusion structure
FIG. 9 is a diagram showing the state of the piezoelectric linear actuator every quarter cycle.
FIG. 10 is a flowchart showing the operation of the mobile phone according to the present embodiment.
FIG. 11 is a diagram showing a display example of braille data and a corresponding braille display unit;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Mobile phone, 2 ... Housing | casing, 3 ... Braille display part, 4 ... Operation button, 5 ... Speaker, 6 ... Microphone, 7 ... Antenna, 20a ... Control bus, 20 ... Control part, 21 ... Memory, 22 ... Communication Interface, 23 ... Input unit, 24 ... Power supply unit, 25 ... Data input / output interface, 26 ... Audio output unit, 27 ... Image display unit, 28 ... Braille unit, 30a ... Braille display area, 30 ... Protrusion, 30a ... Braille Display area 31 ... Slider 32 ... Piezoelectric element 33 ... Triangular protrusion structure 35 ... Electrode 100 ... Piezo linear actuator

Claims (6)

A communication unit for transmitting and receiving data;
A conversion unit that converts the character data received by the communication unit into Braille data;
An electrostrictive material formed in a plate shape, a first electrode provided on one surface of the electrostrictive material, provided on the first electrode, and from two different directions depending on the first electrode A superstructure composed of a projecting structure having a cross-sectional shape in which the apex is supported , and a second electrode provided on the other surface of the electrostrictive material and divided at a position facing the apex of the projecting structure A braille unit having a plurality of protrusions that can be advanced or retracted by the driving force of a sonic motor,
The Braille unit expresses Braille based on the Braille data by transmitting the driving force to each projection by causing the vertex of the projection structure to perform an elliptical motion, and moving each projection forward or backward. A portable terminal device. A data storage unit for storing the received character data or the converted braille data;
The mobile terminal according to claim 1, further comprising: a control unit that reads Braille data from the data storage unit and outputs the Braille data to the Braille unit for each amount of Braille data that the Braille unit can display at one time. apparatus. A communication unit that transmits and receives three-dimensional data including at least uneven information ;
The mobile terminal according to claim 1 or 2 , wherein the braille unit displays the three-dimensional data in a three-dimensional manner by advancing or retracting the protrusions based on the three-dimensional data. apparatus. Each of the protrusions is supported by the protrusion structure in the plurality of ultrasonic motors,
A sine voltage whose phase is shifted by 90 degrees is applied to each of the second electrodes, and an elliptical motion is applied to the tip of the protrusion structure, thereby transmitting a driving force to the protrusions to advance the protrusions. 4. The mobile terminal device according to claim 1, wherein the mobile terminal device is retracted.   The portable terminal device according to claim 4, wherein the protruding structure is made of phosphor bronze.   The mobile terminal device according to claim 1, further comprising a display unit that displays image data or character data so as to be visible.

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