JP7363040B2 - Electronic blackboard system and electronic pen - Google Patents

Description

The present invention relates to an electronic whiteboard system and an electronic pen .

Detecting contact between an electronic pen and an image display unit, and inputting characters or figures by hand at the position of contact when the tip of the electronic pen contacts the surface of the image display unit (for example, a glass member on the surface). Electronic whiteboard systems that can do this are known. Electronic pens can generally be operated (handwritten input) by touching the image display, but technology has been proposed that allows the thickness of input lines to be freely changed when performing handwritten input. .

In such an electronic whiteboard system, for example, the pen tip of an electronic pen is provided with a flexible member that is distorted in accordance with stress applied to the pen tip, and a strain sensor that detects the distortion of the flexible member. The pen pressure of the electronic pen is calculated based on the magnitude of the distortion detected by the distortion sensor, and the thickness of the line drawn on the display surface is set.

However, when drawing a thick line, there was a problem in that if the electronic pen was pressed strongly against the display surface, the electronic blackboard would shake.

The present invention has been made in view of the above, and an object of the present invention is to provide an electronic blackboard system and an electronic pen that can change the thickness of input lines without pressing the electronic pen strongly against the display surface. purpose.

In order to solve the above-mentioned problems and achieve the objects, the present invention provides an electronic blackboard that includes an electronic pen and an electronic blackboard that displays drawing information drawn on a display screen of a display device by the electronic pen on the display screen. In the blackboard system, the electronic pen includes a grip that is provided along a pen axis of the electronic pen at a position along each side of a grip whose cross section is an equilateral triangle , and that grips the grip. a pressure detection unit that detects the pressure when the gripping portion is gripped by bending a plurality of flexible members that bend toward the pen shaft side of the electronic pen in accordance with the force ; and a pressure detection unit that detects the pressure detected by the pressure detection unit. a transmitting section that transmits pressure information according to the pressure information to the electronic whiteboard, and the electronic whiteboard includes a contact position detecting section that detects a contact position of the electronic pen on a display screen of the electronic whiteboard, and the transmitting section. a data generation unit that generates drawing information in a form according to the pressure information transmitted from the data generator; and a display control unit that displays the drawing information generated by the data generation unit at a position corresponding to the contact position on the display screen. It is characterized by comprising the following.

According to the present invention, there is no need to forcefully press the display surface when drawing a thick line.

FIG. 1 is a block diagram showing an example of a schematic configuration of an electronic whiteboard system. FIG. 2 is a diagram showing a schematic structure of an electronic pen used in an electronic whiteboard system. FIG. 3 is a hardware block diagram showing an example of the detailed hardware configuration of the electronic pen. FIG. 4 is a diagram showing an example of the structure of a touch panel. FIG. 5 is a hardware block diagram showing an example of a schematic hardware configuration of the electronic whiteboard system. FIG. 6 is a hardware block diagram showing an example of the detailed hardware configuration of the electronic whiteboard. FIG. 7 is a functional block diagram showing an example of the functional configuration of the electronic whiteboard system. FIG. 8 is a diagram illustrating an example of the relationship between the gripping force of the electronic pen and the line thickness to be set. FIG. 9 is a sequence diagram illustrating an example of a processing sequence performed between an electronic pen and an electronic whiteboard. FIG. 10 is a flowchart showing an example of a series of processing steps performed by the electronic whiteboard system of the first embodiment. FIG. 11 is a diagram illustrating an operation for setting an area in which the thickness of a drawn line is to be changed in the electronic whiteboard system of the second embodiment. FIG. 12 is a flowchart illustrating an example of a series of processes performed by the electronic whiteboard system according to the second embodiment. FIG. 13 is a diagram showing an example of a menu for selecting a drawing color of an electronic pen used in the electronic whiteboard system of the third embodiment. FIG. 14 is a diagram illustrating an example of the relationship between the gripping force of the electronic pen and the color density to be set in the third embodiment. FIG. 15 is a diagram showing a schematic structure of an electronic pen used in the electronic whiteboard system of the fourth embodiment.

(First embodiment)
An electronic whiteboard system and an electronic pen according to a first embodiment will be described below with reference to the accompanying drawings. An electronic blackboard system displays drawing information drawn with an electronic pen on a display screen of a display device such as a large screen display.

FIG. 1 is a block diagram showing an example of a schematic configuration of the electronic whiteboard system 38. As shown in FIG. As shown in FIG. 1, the electronic whiteboard system 38 includes an electronic pen 20 and an electronic whiteboard 35. The electronic whiteboard 35 includes a display device 30, a touch panel 31, and a control section 32. The display device 30 is a large screen display, such as an LCD (Liquid Crystal Device). Note that the display device 30 is an example of a display device. The touch panel 31 is installed in a stacked state on the display device 30 and detects the position touched by the pen tip of the electronic pen 20. The control unit 32 controls the overall operation of the electronic whiteboard 35.

When the electronic pen 20 contacts the touch panel 31, the control unit 32 of the electronic whiteboard 35 acquires coordinate information of the touch panel 31. Then, the electronic whiteboard 35 draws drawing information according to the movement trajectory of the electronic pen 20 at a position of the display device 30 corresponding to the position touched by the electronic pen 20.

(Explanation of the general structure of the electronic pen)
Next, the structure of the electronic pen 20 used in the electronic whiteboard system 38 will be explained using FIG. 2. FIG. 2 is a diagram showing a schematic structure of the electronic pen 20 used in the electronic whiteboard system 38.

As shown in FIG. 2(b), the grip part 18 that grips the electronic pen 20 during writing has three sheets extending in the longitudinal direction of the grip part 18, that is, along the pen shaft that is the central axis of the electronic pen 20. A leaf spring 5 is installed. Note that the leaf spring 5 is an example of a flexible member. These three leaf springs 5 are each arranged at a position along each side of an equilateral triangle in a cross section of the grip portion 18 that crosses the pen axis. The leaf spring 5 is supported by the base portion 2 on the nib 1 side of the electronic pen 20 . Furthermore, the leaf spring 5 is supported by the leaf spring support member 3 on the pen tail side of the electronic pen 20 . A ring member 4 is installed on the rear end side of the leaf spring support member 3, and the ring member 4 is movable in the direction along the pen axis. The ring member 4 comes into contact with the leaf spring support member 3 to push and move the leaf spring support member 3 in the direction of the pen tip 1. This leaf spring support member 3 is fixed at a position where the leaf spring 5 is bent in a convex shape toward the outer circumferential side of the grip portion 18 of the electronic pen 20 . When the grip portion 18 is gripped, the leaf spring 5 deflects toward the pen shaft of the electronic pen 20 depending on the gripping force. In addition, in the space between the pen shaft and the leaf spring 5, a sufficient portion 10 for maintaining the strength of the electronic pen 20 is provided at a position that does not inhibit the deflection of the leaf spring 5. Further, a shaft portion 11 is connected to the rear end of the ring member 4 . The shaft portion 11 is provided to improve balance when drawing while holding the electronic pen 20.

A sheet-like pressure sensor 7 is wound around the outer peripheral surfaces of the three leaf springs 5, as shown in FIG. 2(c). The outer periphery of the pressure sensor 7 is covered with an elastic member 8 as shown in FIG. 2(a). The pressure sensor 7 outputs an analog voltage according to the magnitude of the pressure applied to the pressure sensor 7. The elastic member 8 is an elastically deformable cover member made of a soft material such as a rubber sheet.

When the user grips the electronic pen 20, the leaf spring 5 is bent in an arc along the outer periphery of the elastic member 8 due to the user's grip, as shown in FIG. 2(c). A flat area and a flat area between adjacent leaf springs 5 are formed. As a result, the cross section of the grip portion 18 of the electronic pen 20 has a substantially triangular shape.

When the leaf spring 5 further presses the arc-shaped area along the outer periphery of the electronic pen 20 toward the pen shaft side, the leaf spring 5 bends toward the pen shaft side, and the feeling of pressing the grip portion 18 is changed to the electronic pen 20. Feedback is provided to the user of the pen 20. At this time, the pressure sensor 7 outputs an analog voltage according to the user's gripping force.

Note that a battery is stored inside the electronic pen 20, and the power is turned on and off using a power switch 9 (FIG. 2(a)) installed on the surface of the grip portion 18.

(Explanation of the hardware configuration of the electronic pen)
Next, the hardware configuration of the electronic pen 20 will be described using FIG. 3. FIG. 3 is a hardware block diagram showing an example of a detailed hardware configuration of the electronic pen 20. As shown in FIG.

A CPU (Central Processing Unit) 21 executes a program stored in a ROM (Read Only Memory) 27. The clock generator 22 is composed of a crystal oscillator and a frequency dividing circuit, and generates a clock that controls the operation timing of the CPU 21.

The UART (Universal Asynchronous Receiver Transmitter) 23 is an interface that exchanges serial data between the CPU 21 and the BLE (Bluetooth (registered trademark) Low Energy) module 24, and is an interface that transmits and receives serial data, such as a FIFO (First In, First Out) or shift register. It consists of The BLE module 24 includes an RF section and a baseband section, and performs wireless communication based on the BLE standard via the antenna 25.

The main memory 26 is composed of a DRAM (Dynamic Random Access Memory) and is used as a work area for the CPU 21. The ROM 27 stores programs necessary for processing operations of the electronic pen 20.

The output of the pressure sensor 7 is input to an A/D (Analog/Digital) converter 28 . Then, the A/D converter 28 outputs a level value (for example, 0 to 15) according to the range of the input analog voltage. For example, when the voltage value input to the A/D converter 28 is in the smallest range, a level value=0 is output. On the other hand, when the voltage value input to the A/D converter 28 is in the largest range, a level value=15 is output. Note that the pressure sensor 7 outputs an analog voltage according to the magnitude of the gripping force (pressure) with which the electronic pen 20 is gripped, for example, the greater the gripping force, the higher the analog voltage. Note that in FIG. 3, illustration of a battery as a power source is omitted.

(Explanation of the schematic configuration of the electronic whiteboard system)
Next, the hardware configuration of the electronic whiteboard 35 will be explained using FIGS. 4 and 5. FIG. 4 is a diagram showing an example of the configuration of the touch panel 31. FIG. 5 is a hardware block diagram showing an example of a schematic hardware configuration of the electronic whiteboard system 38. As shown in FIG.

As shown in FIG. 4, on the touch panel 31, an LED 31a that emits infrared rays and a phototransistor 31b are arranged at opposing positions. Then, the touch panel 31 determines that the touched position is the part where the phototransistor 31b cannot detect the infrared rays emitted from the LED 31a, that is, the part where the infrared rays are blocked.

Note that FIG. 4 shows an example in which 20 LEDs 31a and 15 phototransistors 31b are arranged in the horizontal direction and 15 in the vertical direction. When the touch panel 31 has a size of 40 inches or more, more LEDs 31a and phototransistors 31b are arranged.

Note that the electronic whiteboard 35 may include a touch panel 31 having a configuration different from that in FIG. 4 . For example, two light receiving and emitting devices installed at both upper ends of the display device 30 are made to emit a plurality of infrared rays parallel to the display surface of the display device 30, and the emitted infrared rays are placed around the display device 30. Alternatively, the infrared rays may be reflected by a reflective member and returned along the same optical path as the emitted infrared rays, and the light receiving element may receive the infrared rays. In this case, the touch panel 31 outputs the ID of the infrared rays emitted by the two light receiving and emitting devices blocked by the object to the control unit 32, and the control unit 32 specifies the coordinate position that is the contact position of the object.

In addition, the touch panel 31 is not limited to the infrared cutoff type, but may also be a capacitive type touch panel that identifies the touch position by detecting changes in capacitance, or a touch panel that identifies the touch position by voltage changes between two opposing resistive films. A touch panel that operates using various detection means may be used, such as a resistive film type touch panel or an electromagnetic induction type touch panel that detects electromagnetic induction generated when a touch object contacts the display section and specifies the contact position.

Next, a schematic hardware configuration of the electronic whiteboard system 38 will be described using FIG. 5. As shown in FIG. 5, the electronic whiteboard 35 includes a CPU 40, a ROM 47, a RAM (Random Access Memory) 203, an SSD (Solid State Drive) 204, a network I/F (Interface) 205, and an external device connection interface. /F206.

Among these, the CPU 40 controls the entire operation of the electronic whiteboard 35. The ROM 47 stores programs used to drive the CPU 40, such as the CPU 40 and an IPL (Initial Program Loader). RAM 203 is used as a work area for CPU 40. The SSD 204 stores various data such as programs for the electronic whiteboard 35. Network I/F 205 controls communication with a communication network (not shown). The external device connection I/F 206 is an interface for connecting various external devices. The external devices in this case are, for example, a USB (Universal Serial Bus) memory 230 and external devices (microphone 240, speaker 250, camera 260).

The electronic whiteboard 35 also includes a capture device 211, a GPU 212, a display controller 54, a touch panel 31, a touch panel controller 215, an electronic pen controller 216, a short-range communication circuit 219, and an antenna 44 of the short-range communication circuit 219. , a power switch 222 and selection switches 223.

Among these, the capture device 211 causes the display of an external PC (Personal Computer) 270 to display video information as a still image or a moving image. A GPU (Graphics Processing Unit) 212 is a semiconductor chip that specializes in graphics. The display controller 54 controls and manages screen display in order to output the output image from the GPU 212 to the display device 30 or the like. The touch panel 31 detects that the electronic pen 20, the user's hand H, or the like has touched the display device 30. Touch panel controller 215 controls processing of touch panel 31. The operating principle of the touch panel 31 is as described above.

Note that the control unit 32 shown in FIG. 1 includes the CPU 40, the ROM 47, the RAM 203, the SSD 204, the touch panel controller 215, the GPU 212, and the display controller 54 shown in FIG.

The electronic pen controller 216 communicates with the electronic pen 20 to determine whether or not the display device 30 has been touched with the tip of the pen or the end of the pen. Furthermore, the electronic pen controller 216 may determine whether or not a portion of the electronic pen 20 held by the user or other parts of the electronic pen 20 is touched, in addition to the pen tip and pen tail of the electronic pen 20. good.

The near field communication circuit 219 is a communication circuit such as NFC (Near Field Communication) or Bluetooth (registered trademark). The power switch 222 is a switch for switching the power of the electronic blackboard 35 ON/OFF. The selection switches 223 are, for example, a group of switches for adjusting the brightness, shade, etc. of the display of the display device 30.

Further, the electronic whiteboard 35 includes a bus line 210. The bus line 210 is an address bus, a data bus, etc. for electrically connecting each component such as the CPU 40 shown in FIG. 5.

(Explanation of detailed configuration of electronic whiteboard system)
Next, the detailed hardware configuration of the electronic whiteboard 35 will be explained using FIG. 6. FIG. 6 is a hardware block diagram showing an example of a detailed hardware configuration of the electronic whiteboard 35. As shown in FIG. Note that FIG. 6 is a hardware block diagram showing a detailed hardware configuration by extracting only the essential parts of the electronic blackboard 35 from the hardware block diagram of FIG.

The CPU 40 executes and processes programs stored in the ROM 47 and the OS (Operating System) and various programs read out from the hard disk 50 to the main memory 41 . The main memory 41 is an example of the RAM 203 in FIG. 5, is composed of, for example, a DRAM, and is used as a work area for the CPU 40, etc.

The UART 42 is an interface for exchanging serial data between the CPU 40 and the BLE module 43, and is composed of a FIFO, a shift register, and the like. The BLE module 43 includes an RF section and a baseband section, and performs wireless communication in accordance with the BLE standard via the antenna 44. Note that the UART 42 and the BLE module 43 are an example of the short-range communication circuit 219 in FIG. 5.

The clock generator 45 is composed of a crystal oscillator and a frequency dividing circuit, and generates a clock for controlling the operation timing of the CPU 40 and the bus controller 46. Bus controller 46 controls data transfer on CPU bus 62 and X bus 64. Programs for starting up the system when the power is turned on and controlling various devices are written in the ROM 47 in advance. PCI bridge 48 uses cache memory 49 to transfer data between PCI bus 63 and CPU 40 . Note that the CPU bus 62, the X bus 64, and the PCI bus 63 are examples of the bus line 210 in FIG.

Cache memory 49 is composed of DRAM, and is used by PCI bridge 48. Note that the cache memory 49 is an example of the RAM 203 in FIG. The hard disk 50 stores system software, various application programs, a large amount of user data, and the like. The HD controller 51 has, for example, an IDE (Integrated Device Electronics) interface as an interface with the hard disk 50, and performs high-speed data transfer with the hard disk 50. The RS-232C controller 52 executes a data transmission operation based on the RS-232C standard, and inputs the input coordinate data output from the touch panel 31 via the RS-232C I/F 53. The display controller 54 performs D/A (Digital/Analog) conversion of character data, graphic data, etc., and performs control for displaying these data on the display device 30.

The LAN controller 55 executes a communication protocol based on the IEEE802.3 standard, for example, and controls communication with other devices connected to the Ethernet (registered trademark) via the LAN I/F 56. Note that the LAN controller 55 and the LAN I/F 56 are examples of the network I/F 205 in FIG. 5.

The keyboard controller 57 converts serial data input from the keyboard 58 into parallel data. The mouse I/F 59 has a port for a mouse, and is controlled by a mouse driver (control program). An RTC (Real-Time Clock) 61 is a date clock and is backed up by a battery (not shown). Note that in the electronic whiteboard 35, since the touch panel 31 functions as an input device for the control unit 32, there is no need to connect the keyboard 58 and mouse 60 except during maintenance work.

(Explanation of functional configuration of electronic whiteboard system)
Next, the functional configuration of the electronic whiteboard system 38 will be explained using FIGS. 7 and 8. FIG. 7 is a functional block diagram showing an example of the functional configuration of the electronic whiteboard system 38. As shown in FIG. FIG. 8 is a diagram showing an example of the relationship between the gripping force of the electronic pen 20 and the line thickness to be set.

The electronic pen 20 implements each functional unit shown in FIG. 7 inside the CPU 21 by executing a program used to drive the CPU 21. Further, the electronic whiteboard 35 implements each functional unit shown in FIG. 7 inside the CPU 40 by executing a program used to drive the CPU 40.

That is, the electronic pen 20 implements the gripping force detection section 70 and the data transmission section 71 as functional sections inside the CPU 21. The electronic whiteboard 35 also includes a contact position detection section 80, a data reception section 81, a grip force determination section 82, a drawing data generation section 83, a display control section 84, and an operation control section 85 inside the CPU 40. , BLE communication control unit 86 are realized as functional units.

The gripping force detection unit 70 detects the pressure when the electronic pen 20 is gripped. The gripping force detection section 70 is realized by the A/D converter 28 and the pressure sensor 7. Note that the gripping force detection section 70 is an example of a pressure detection section.

The data transmitter 71 transmits various data to the electronic whiteboard 35 using BLE communication. For example, the data transmitter 71 transmits pressure information corresponding to the magnitude of the pressure detected by the gripping force detector 70 to the electronic whiteboard 35 via BLE communication. Note that the data transmitter 71 is an example of a transmitter.

The contact position detection unit 80 detects the contact position of the electronic pen 20 on the display screen of the display device 30. Specifically, the contact position detection unit 80 detects the contact position of the electronic pen 20 with respect to the touch panel 31 stacked on the display device 30.

The data receiving unit 81 receives various data (for example, pressure information) transmitted by the data transmitting unit 71 through BLE communication.

The gripping force determining unit 82 determines the drawing state indicating the thickness of the line based on the pressure information (voltage level) that the data receiving unit 81 receives from the electronic pen 20 . The gripping force determining unit 82 refers to the correspondence table Q1 between gripping force levels (1 to 15) and line thicknesses (T1 to T5) shown in FIG. 8, and determines the line thickness corresponding to the received gripping force level. Set. Specifically, the thickness of the line to be drawn is changed into five levels, for example, depending on the gripping force (pressure) level. Specifically, when the voltage level value indicating the gripping force is 1 to 3, the thickness is T1 (the thinnest), when the voltage level value is 4 to 6, the thickness is T2, and when the voltage level value is 7 to 9, the thickness is T1 (the thinnest). When the voltage level value is 10 to 12, the thickness is T4, and when the voltage level value is 13 to 15, the thickness is T5 (the thickest).

The drawing data generating section 83 generates drawing information in a form according to the pressure information transmitted from the data transmitting section 71. Specifically, the drawing data generation unit 83 generates drawing information in a form according to the determination result of the gripping force determination unit 82. Note that the drawing data generation section 83 is an example of a data generation section.

The display control unit 84 displays the drawing information generated by the drawing data generation unit 83 at a position corresponding to the contact position of the electronic pen 20 on the display device 30.

The operation control unit 85 receives various operations on the electronic whiteboard 35.

The BLE communication control unit 86 executes BLE communication.

(Explanation of the outline of the processing performed by the electronic whiteboard system)
Next, an overview of the processing performed by the electronic whiteboard system 38 will be explained using FIG. FIG. 9 is a sequence diagram showing an example of the sequence of processing performed between the electronic pen 20 and the electronic blackboard 35.

The control unit 32 of the electronic whiteboard 35 periodically transmits a BLE advertisement packet to the electronic pen 20 (sequence S1). Then, when the user turns on the power of the electronic pen 20 using the power switch 9 of the electronic pen 20, the electronic pen 20 starts BLE communication and receives an advertisement packet from the control unit 32 of the electronic whiteboard 35. .

After receiving the advertisement packet, the electronic pen 20 transmits a scan request packet to the control unit 32 of the electronic whiteboard 35 (sequence S2).

Then, the electronic pen 20 receives a scan response packet from the control unit 32 of the electronic whiteboard 35 (sequence S3).

After this sequence S3, the electronic pen 20 becomes the master, the control unit 32 of the electronic whiteboard 35 becomes the slave, and the electronic pen 20 transmits a connection request signal CONNECT_REQ PDU (Protocol Data Unit) to the control unit 32 of the electronic whiteboard 35. and performs BLE connection (sequence S4).

When the user brings the electronic pen 20 into contact with the display device 30 of the electronic blackboard 35, the touch panel 31 (touch position detection unit 80) detects the interruption of light and displays the coordinates of the position touched by the electronic pen 20 on the electronic blackboard 35. output to the control section 32 of. Then, when the user moves the electronic pen 20 while keeping it in contact with the display device 30 of the electronic whiteboard 35 (writing operation), the touch panel 31 outputs the coordinates after the movement to the control unit 32 of the electronic whiteboard 35 .

The control unit 32 (drawing data generation unit 83) of the electronic whiteboard 35 draws a line connecting these coordinates, but before drawing, the control unit 32 (BLE communication control unit 86) of the electronic whiteboard 35 , a grip force acquisition command is included in a BLE LL (Logical Link) DATA PDU and transmitted to the electronic pen 20 (sequence S5).

Upon receiving the gripping force acquisition command, the electronic pen 20 includes the level (voltage level) of the gripping force (pressure) in the BLE LL Data PDU and transmits it to the control unit 32 of the electronic whiteboard 35 (sequence S6).

The control unit 32 (grip force determination unit 82) of the electronic whiteboard 35 refers to the correspondence table between grip force levels and line thicknesses shown in FIG. 8, and sets the line thickness corresponding to the received grip force level. do. Then, the drawing data generation unit 83 generates drawing information by connecting the coordinates with a line of a set thickness. For example, when the gripping force level received by the electronic blackboard 35 is 14, the drawing data generation unit 83 generates drawing information with a thickness T5 (the thickest). The display control unit 84 then displays the generated drawing information on the display device 30. In this way, drawing information whose thickness corresponds to the strength with which the user grips the electronic pen 20 is displayed on the display device 30 of the electronic blackboard 35.

(Explanation of the flow of processing performed by the electronic whiteboard system)
Next, the flow of processing performed by the electronic whiteboard system 38 will be explained using FIG. 10. FIG. 10 is a flowchart showing an example of a series of processing steps performed by the electronic whiteboard system 38 of the first embodiment.

The control unit 32 of the electronic whiteboard 35 transmits a BLE advertisement packet to the electronic pen 20 (step S11).

The data receiving unit 81 determines whether a scan request packet has been received from the electronic pen 20 (step S12). If it is determined that a scan request packet has been received (step S12: Yes), the process advances to step S13. On the other hand, if it is not determined that the scan request packet has been received (step S12: No), the process advances to step S14.

If the determination in step S12 is Yes, the BLE communication control unit 86 transmits a scan response packet to the electronic pen 20 (step S13). After that, the process advances to step S15.

On the other hand, if the determination in step S12 is No, the control unit 32 of the electronic whiteboard 35 determines whether the waiting time for receiving the scan request packet has elapsed for a predetermined period of time (step S14). If it is determined that the predetermined time has elapsed (step S14: Yes), the process returns to step S11. On the other hand, if it is not determined that the predetermined time has elapsed (step S14: No), the process returns to step S12.

Following step S13, the BLE communication control unit 86 determines whether a connection request signal CONNECT_REQ PDU has been received from the electronic pen 20 (step S15). If it is determined that the connection request signal has been received (step S15: Yes), the process advances to step S16. On the other hand, if it is not determined that the connection request signal has been received (step S15: No), step S15 is repeated.

The contact position detection unit 80 determines whether two contact position coordinates of the electronic pen 20 have been input to the touch panel 31 (step S16). If it is determined that two contact position coordinates of the electronic pen 20 have been input (step S16: Yes), the process advances to step S17. On the other hand, if it is not determined that two contact position coordinates of the electronic pen 20 have been input (step S16: No), step S16 is repeated.

If the determination in step S16 is Yes, the BLE communication control unit 86 transmits a grip force acquisition command to the electronic pen 20 (step S17).

The data receiving unit 81 determines whether the grip force level has been received from the electronic pen 20 (step S18). If it is determined that the gripping force level has been received (step S18: Yes), the process advances to step S19. On the other hand, if it is not determined that the gripping force level has been received (step S18: No), step S18 is repeated.

If the determination in step S18 is Yes, the drawing data generation unit 83 generates drawing information having a thickness corresponding to the gripping force level. Then, the display control unit 84 draws (displays) the generated drawing information on the display device 30 (step S19). Thereafter, the electronic whiteboard system 38 ends the process of FIG. Note that, in reality, input of drawing information is performed intermittently, so the process of FIG. 10 is repeatedly performed until the operation control unit 85 detects an operation by the user instructing the end of the drawing operation.

As explained above, according to the electronic whiteboard system 38 of the first embodiment, when the gripping force detection section 70 (pressure detection section) of the electronic pen 20 is gripped when the gripping section 18 of the electronic pen 20 is gripped during writing, Detects the gripping force (pressure) of the Then, the data transmitting section 71 (transmitting section) transmits a voltage level (pressure information) corresponding to the magnitude of the pressure detected by the gripping force detecting section 70 to the electronic blackboard 35. The contact position detection unit 80 of the electronic whiteboard 35 detects the contact position of the electronic pen 20 on the display screen of the display device 30 of the electronic whiteboard 35 . Then, the drawing data generation section 83 (data generation section) generates drawing information in a form according to the pressure information transmitted from the data transmission section 71. The display control unit 84 displays the drawing information generated by the drawing data generation unit 83 at a position corresponding to the contact position of the electronic pen 20 on the display screen of the display device 30. Therefore, since drawing information is generated in a form that corresponds to the gripping force of the electronic pen 20, it is possible to change the thickness of a drawn line, for example, without strongly pressing the electronic pen 20 against the display screen.

Further, according to the electronic whiteboard system 38 of the first embodiment, the drawing data generation section 83 (data generation section) adjusts the thickness of the line according to the pressure information transmitted from the data transmission section 71 (transmission section). Generate drawing information. Therefore, the thickness of the line to be drawn can be easily set depending on the force with which the electronic pen 20 is gripped.

Further, according to the electronic whiteboard system 38 of the first embodiment, the gripping force detection section 70 (pressure detection section) uses a plurality of leaf springs 5 (flexible members) installed extending in the longitudinal direction of the gripping section 18. Be prepared. When the grip portion 18 is gripped, the leaf spring 5 is bent toward the pen shaft of the electronic pen 20 according to the grip force. Therefore, when the grip portion 18 of the electronic pen 20 is gripped, the leaf spring 5 is bent, thereby producing a reaction force corresponding to the gripping force. Therefore, the feeling of pressing the grip portion 18 against the pen shaft side can be fed back to the user.

Further, according to the electronic whiteboard system 38 of the first embodiment, the leaf springs 5 (flexible members) are provided at positions along each side of the grip portion 18 whose cross section is an equilateral triangle. Therefore, since the leaf spring 5 can be pressed with each of the three fingers that grip the electronic pen 20 during writing, the gripping force can be transmitted to the electronic pen 20 in a natural manner.

Further, according to the electronic whiteboard system 38 of the first embodiment, the gripping force detection section 70 (pressure detection section) includes a sheet-like pressure sensor 7 that covers the outer periphery of the plurality of leaf springs 5 (flexible members). Therefore, the gripping force (pressure) of the electronic pen 20 can be detected regardless of the gripping position of the gripping part 18.

Further, according to the electronic whiteboard system 38 of the first embodiment, the gripping force detection section 70 (pressure detection section) includes the elastic member 8 that covers the outer periphery of the pressure sensor 7 . Therefore, when the electronic pen 20 is gripped, it is possible to prevent the shape of the grip portion 18 from changing due to the bending of the leaf spring 5, thereby preventing the electronic pen 20 from becoming difficult to grip.

Further, according to the electronic whiteboard system 38 of the first embodiment, when the grip part 18 of the electronic pen 20 is gripped, the elastic member 8 has a plurality of leaf springs 5 (flexible members) attached to the outer periphery of the grip part 18. A circular arc region formed by deforming into a circular arc shape and a plane region connecting between the plurality of leaf springs 5 are formed. Therefore, the gripping force can be detected in both the arc region where the fingers supporting the electronic pen 20 are attached and the flat region formed between the different leaf springs 5 and serving as the grip guiding plane.

(Second embodiment)
Next, an electronic whiteboard system 38a according to a second embodiment will be described. If the user wants to keep the thickness of the drawn line the same over a certain period of time, it is necessary to keep the force with which the electronic pen 20 is held constant during that period. However, it may be difficult to maintain a constant gripping force over a certain period of time. The electronic blackboard system 38a of the second embodiment has a function of drawing lines with a default thickness while writing with the electronic pen 20, and changing the thickness of the written lines all at once after writing is completed. Be prepared. Since the electronic whiteboard system 38a has substantially the same hardware configuration and functional configuration as the electronic whiteboard system 38 described above, common components will be described using the same reference numerals.

When the user brings the electronic pen 20 into contact with the display device 30 of the electronic whiteboard 35, the touch panel 31 laminated on the surface of the display device 30 detects the interruption of light and electronically records the coordinates of the position touched by the electronic pen 20. It is output to the control section 32 of the blackboard 35. When the user moves the electronic pen 20 while keeping it in contact with the display device 30 of the electronic whiteboard 35 (writing operation), the touch panel 31 outputs the coordinates after the movement to the control unit 32 of the electronic whiteboard 35 . The control unit 32 of the electronic whiteboard 35 draws a line of default thickness (for example, thickness T1) between these coordinates. Note that the control unit 32 does not transmit the gripping force acquisition command at this point.

After the user finishes the writing operation with the electronic pen 20, the user selects a line thickness change button displayed on the display device 30. Then, the operation control unit 85 detects that the line thickness change button has been operated. At this time, the control unit 32 of the electronic whiteboard 35 transitions the state of the electronic whiteboard system 38a to a change mode (line thickness change mode) for changing the thickness of the drawn line. When in this change mode, the user brings the electronic pen 20 into contact with the display device 30. Then, by dragging the electronic pen 20 while keeping it in contact, an area is set on the display device 30 in which the thickness of the drawn line is to be changed. Specifically, a rectangular area surrounding the drawn line is set. This process is performed by the action of the operation control section 85.

FIG. 11 is a diagram illustrating an operation for setting an area in which the thickness of a drawn line is to be changed in the electronic whiteboard system 38a of the second embodiment. FIG. 11A is a diagram showing an example in which a region in which the line thickness is to be changed is set after drawing information is drawn with a default thickness. FIG. 11(a) is an example in which a region is set with point P as the upper left corner and point Q as the lower right corner.

The user first brings the electronic pen 20 into contact with the upper left corner of the area where the thickness of the drawn line is to be changed. At this time, the contact position detection unit 80 detects the coordinate value of the contact. Then, the display control unit draws a point P at the position of the detected coordinate values.

Then, the user moves (drags) the electronic pen 20 toward the lower right while keeping it in contact with the display device 30. Then, when the electronic pen is released from the display device 30, the display control unit 84 draws a rectangular area such that point Q, which is the last contact point of the electronic pen 20, is at the lower right corner. (At this time, the display control unit 84 continues to draw a rectangular area with the point P as the upper left and the contact position of the electronic pen 20 being dragged as the lower right. In other words, the rectangular area gradually Then, when the user releases the electronic pen 20 from the display device 30, the rectangular area being drawn at that time is set as the target area for changing the thickness of the drawn line.

When the area in which the line thickness is to be changed is determined, the control unit 32 of the electronic whiteboard 35 includes a grip force acquisition command in the BLE LL Data PDU and transmits it to the electronic pen 20. Upon receiving this command, the electronic pen 20 includes the gripping force level (voltage level) in the BLE LL Data PDU and transmits it to the control unit 32 of the electronic whiteboard 35 . The control unit 32 of the electronic whiteboard 35 repeatedly transmits the grip force acquisition command at predetermined time intervals until the electronic pen 20 next contacts the display device 30.

After specifying the area in which the line thickness is to be changed, the user changes the strength with which he or she grips the electronic pen 20. At the timing when the electronic pen 20 receives the grip force acquisition command from the control unit 32 of the electronic whiteboard 35, the electronic pen 20 transmits the grip force level (voltage level) at that time to the control unit 32 of the electronic whiteboard 35. The control unit 32 of the electronic whiteboard 35 redraws the line inside the rectangular area with a thickness according to this gripping force level. When the thickness of the line reaches a desired thickness, the user touches the display device 30 with the electronic pen 20. When the control unit 32 of the electronic blackboard 35 detects this touch, it stops transmitting the grip strength acquisition command and erases the boundary line of the rectangular area displayed as the area where the line thickness is to be changed (FIG. 11(b)). In this way, the user can change the thickness of the drawn lines all at once after writing to some extent.

Next, the flow of processing performed by the electronic whiteboard system 38a will be explained using FIG. 12. FIG. 12 is a flowchart showing an example of a series of processing steps performed by the electronic whiteboard system 38a of the second embodiment.

The contact position detection unit 80 determines whether two contact position coordinates of the electronic pen 20 have been input to the touch panel 31 (step S21). If it is determined that two contact position coordinates of the electronic pen 20 have been input (step S21: Yes), the process advances to step S22. On the other hand, if it is not determined that two contact position coordinates of the electronic pen 20 have been input (step S21: No), step S21 is repeated.

If the determination in step S21 is Yes, the drawing data generation unit 83 generates drawing information using lines of default thickness. Then, the display control unit 84 draws (displays) the generated drawing information on the display device 30 (step S22).

The operation control unit 85 determines whether an instruction to change the line thickness has been given (step S23). If it is determined that an operation to change the line thickness has been performed (step S23: Yes), the process advances to step S24. On the other hand, if it is not determined that an operation to change the line thickness has been performed (step S23: No), step S23 is repeated.

If it is determined Yes in step S23, the contact position detection unit 80 determines whether the electronic pen 20 has contacted the display screen of the display device 30 (step S24). If it is determined that the electronic pen 20 has made contact (step S24: Yes), the process advances to step S25. On the other hand, if it is not determined that the electronic pen 20 has made contact (step S24: No), step S24 is repeated.

If the determination is Yes in step S24, the contact position detection unit 80 determines whether the electronic pen 20 has moved while being in contact with the display screen of the display device 30 (step S25). If it is determined that the electronic pen 20 has moved while being in contact with the display screen of the display device 30 (step S25: Yes), the process advances to step S26. On the other hand, if it is not determined that the electronic pen 20 has moved while in contact with the display screen of the display device 30 (step S25: No), step S25 is repeated.

The display control unit 84 displays a rectangle whose upper left corner is the position first touched by the electronic pen 20 on the display screen of the display device 30 (step S26). Note that the lower right corner of the rectangle at this time is the position where it is determined in step S25 that the electronic pen 20 has moved while being in contact with the display screen of the display device 30.

The contact position detection unit 80 determines whether the electronic pen 20 has moved away from the display screen of the display device 30 (step S27). If it is determined that the electronic pen 20 has moved away from the display screen of the display device 30 (step S27: Yes), the process proceeds to step S28. On the other hand, if it is not determined that the electronic pen 20 has left the display screen of the display device 30 (step S27: No), the process returns to step S25.

If the determination in step S27 is Yes, the BLE communication control unit 86 transmits a grip force acquisition command to the electronic pen 20 (step S28).

The data receiving unit 81 determines whether the grip force level has been received from the electronic pen 20 (step S29). If it is determined that the gripping force level has been received (step S29: Yes), the process advances to step S30. On the other hand, if it is not determined that the gripping force level has been received (step S29: No), step S29 is repeated.

If the determination in step S29 is Yes, the drawing data generation unit 83 generates drawing information in which the thickness of the line within the area surrounded by the rectangle is changed. Then, the display control unit 84 redraws the generated drawing information on the display device 30 (step S30).

The contact position detection unit 80 determines whether the electronic pen 20 has contacted the display screen of the display device 30 (step S31). If it is determined that the electronic pen 20 has made contact (step S31: Yes), the process advances to step S32. On the other hand, if it is not determined that the electronic pen 20 has made contact (step S31: No), the process advances to step S33.

If the determination is Yes in step S31, the display control unit 84 erases the boundary line of the rectangular area displayed on the display screen of the display device 30 (step S32). After that, the electronic whiteboard system 38a ends the process of FIG. 12.

On the other hand, if the determination in step S31 is No, the control unit 32 of the electronic whiteboard 35 determines whether a predetermined time has elapsed (step S33). If it is determined that the predetermined time has elapsed (step S33: Yes), the process returns to step S28. On the other hand, if it is not determined that the predetermined time has elapsed (step S33: No), step S33 is repeated.

As described above, according to the electronic whiteboard system 38a of the second embodiment, the operation control unit 85 receives an instruction to change the thickness of the drawn line and changes the thickness of the line within the specified area. Change the settings all at once. Therefore, after drawing a line with the electronic pen 20, the thickness of the drawn line can be changed all at once. There is no need to keep holding the electronic pen 20.

(Third embodiment)
Next, an electronic whiteboard system 38b according to a third embodiment will be described. The electronic blackboard system 38b has a function of changing the color density of a line depending on the force with which the user grips the electronic pen 20 when the user writes on the electronic blackboard 35 using the electronic pen 20.

The operation until the electronic pen 20 and the control unit 32 of the electronic whiteboard 35 are connected by BLE is the same as in the first embodiment.

A menu for selecting the drawing color of the electronic pen 20 is displayed on the display device 30 of the electronic blackboard 35. FIG. 13 is an example of a menu screen displayed on the display device 30 when selecting one of black (gray) Ca, red Cb, blue Cc, and green Cd as the drawing color of the electronic pen 20. The user selects one color from this menu screen to set the drawing color of the electronic pen 20.

Thereafter, when the user brings the electronic pen 20 into contact with the display device 30 of the electronic blackboard 35, the contact position detection unit 80 detects the interruption of light and detects the coordinates of the position touched by the electronic pen 20 on the electronic blackboard 35. It is output to the control section 32. When the user moves the electronic pen 20 while keeping it in contact with the display device 30 of the electronic whiteboard 35 (writing operation), the touch panel 31 outputs the coordinates after the movement to the control unit 32 of the electronic whiteboard 35 . The drawing data generation unit 83 draws a line between these coordinates, but before drawing, the BLE communication control unit 86 includes a grip force acquisition command in the BLE LL Data PDU and transmits it to the electronic pen 20. . Upon receiving this command, the electronic pen 20 includes the level (voltage level) of the gripping force (pressure) in the BLE LL Data PDU and transmits it to the control unit 32 of the electronic blackboard 35 .

The gripping force determining unit 82 refers to the correspondence table Q2 between gripping force levels (1 to 15) and color depths (D1 to D5) shown in FIG. Set the color intensity corresponding to the power level. Then, the drawing data generation unit 83 generates drawing information in which a line of the set color density is drawn between the coordinates. Then, the display control unit 84 displays the generated drawing information on the display device 30. For example, if the received gripping force level is "14", a line of darkness D5 (the darkest) is drawn in the previously set color. Note that the color displayed when selecting the drawing color of the electronic pen 20 (displayed color in FIG. 13) has a density D3. In this way, a line drawn with a color density corresponding to the strength with which the user grips the electronic pen 20 is displayed on the display device 30 of the electronic blackboard 35.

As described above, according to the electronic whiteboard system 38b of the third embodiment, the drawing data generation section 83 (data generation section) generates a color according to the pressure information transmitted from the data transmission section 71 (transmission section). Generates density drawing information. Therefore, the color density of the line to be drawn can be easily set by the force with which the electronic pen 20 is gripped.

(Fourth embodiment)
Next, a fourth embodiment will be described using FIG. 15. FIG. 15 is a diagram showing a schematic structure of an electronic pen 20a used in the electronic whiteboard system 38 of the fourth embodiment.

The electronic pen 20a has the same internal structure as the electronic pen 20 (FIG. 2) described in the first embodiment. A plate-shaped assist member 90 is installed on the outer peripheral surface of the elastic member 8. The assist member 90 is engaged with the elastic member 8 at a fulcrum 91 on the nib 1 side of the electronic pen 20a. The pen tail side of the assist member 90 opposite to the fulcrum 91 is spaced apart from the surface of the elastic member 8. That is, the assist member 90 exhibits a cantilevered state with the pen tip 1 side serving as a fulcrum and the pen tail side serving as a point of effort. Furthermore, the assist member 90 has a protrusion 92 in the intermediate portion that protrudes toward the gripping portion side, that is, toward the elastic member 8 side. Note that the assist member 90 is an example of an operation assist section.

When the user grips the electronic pen 20a and pushes the end of the assist member 90 on the pen tail side with a finger F, the protrusion 92 pushes the elastic member 8 toward the pen shaft. That is, when the end of the assist member 90 on the pen butt side is pushed in, the protrusion 92 acts as a point of action. The pushed-in protrusion 92 presses the elastic member 8 and the pressure sensor 7 in the direction of the pen axis.

In the electronic pen 20a, by pressing down the end of the assist member 90 on the pen tail side, pressure can be generated to push the elastic member 8 and the pressure sensor 7 with a small force based on the lever principle. That is, according to the electronic pen 20a, it is possible to forcefully press the elastic member 8 and the pressure sensor 7 even with a light force, and even a user with weak force can draw a line of a desired thickness. Become.

Note that even if the assist member 90 has a fulcrum 91 on the pen tail side and a force point on the pen nib 1 side, the same effect as described above can be obtained.

As described above, according to the electronic whiteboard system 38 of the fourth embodiment, the electronic pen 20a includes the assist member 90 (operation assist section). The assist member 90 has one end fixed to the grip of the electronic pen 20a, the other end spaced apart from the grip, and has a protrusion 92 protruding toward the grip in the middle. . The gripping force detection unit 70 (pressure detection unit) detects the pressure with which the protrusion 92 presses the grip when the other end of the assist member 90 is pressed down. Therefore, the user can strongly push the elastic member 8 and pressure sensor 7 with a light force, and can easily set the desired line thickness.

Although the embodiments of the present invention have been described above, the embodiments described above are presented as examples and are not intended to limit the scope of the present invention. This novel embodiment can be implemented in various other forms. Furthermore, various omissions, substitutions, and changes can be made without departing from the gist of the invention. Further, this embodiment is included within the scope and gist of the invention, and is also included within the scope of the invention described in the claims and its equivalents.

For example, the program described in the embodiment may be stored in advance in the ROM 27 of the electronic pen 20 and the ROM 47 of the electronic blackboard 35, or may be provided as an installable or executable file on a CD-ROM. , a flexible disk (FD), a CD-R, a DVD (Digital Versatile Disc), or the like may be configured to be recorded and provided on a computer-readable recording medium. That is, for example, a USB I/F may be installed in the electronic pen 20 and the electronic whiteboard 35, and the program may be read from a recording medium via the USB I/F. Furthermore, the electronic pen 20 may be provided with a network connection function, and the program may be provided by downloading the program from a computer connected to a network such as the Internet using the network connection function. Similarly, the program may be provided by being downloaded from a computer connected to a network such as the Internet via the LAN I/F 56 of the electronic whiteboard 35. Further, the program may be configured to be provided or distributed via a network such as the Internet.

5 Leaf spring (flexible member)
7 Pressure sensor 8 Elastic member 18 Grip portion 20 Electronic pen 30 Display device (display device)
31 Touch panel 35 Electronic whiteboard 38, 38a, 38b Electronic whiteboard system 70 Gripping force detection unit (pressure detection unit)
71 Data transmission section (transmission section)
80 Contact position detection section 81 Data reception section 82 Grip force judgment section 83 Drawing data generation section (data generation section)
84 Display control section 85 Operation control section 90 Assist member (operation assist section)

JP2006-092410A

Claims (8)

An electronic blackboard system comprising an electronic pen and an electronic blackboard that displays drawing information drawn on a display screen of a display device by the electronic pen on the display screen,
The electronic pen is
It is provided along the pen shaft of the electronic pen at a position along each side of a grip portion whose cross section is an equilateral triangle, and the grip portion is provided on the pen shaft side of the electronic pen according to the gripping force for gripping the grip portion. a pressure detection unit that detects the pressure when the gripping portion is gripped by the flexure of the plurality of flexure members that are flexed;
a transmitter that transmits pressure information corresponding to the magnitude of the pressure detected by the pressure detector to the electronic whiteboard,
The electronic blackboard is
a contact position detection unit that detects a contact position of the electronic pen on a display screen of the electronic blackboard;
a data generation unit that generates drawing information in a form according to the pressure information transmitted from the transmission unit;
a display control unit that displays the drawing information generated by the data generation unit at a position corresponding to the contact position on the display screen;
Electronic blackboard system. An electronic blackboard system comprising an electronic pen and an electronic blackboard that displays drawing information drawn on a display screen of a display device by the electronic pen on the display screen,
The electronic pen is
A plurality of flexible members are provided along a pen shaft of the electronic pen in a grip portion of the electronic pen, and are bent toward the pen shaft side of the electronic pen in response to a grip force for gripping the grip portion; A sheet-like pressure sensor that covers the outer periphery of a flexible member; and an elastic member that covers the outer periphery of the pressure sensor, and when the grip portion is gripped, the plurality of flexible members formed by the elastic member The pressure when the gripping part is gripped is detected by the pressure sensor in a circular arc region deformed into an arc shape along the outer periphery of the gripping part and a flat region connecting between the plurality of flexible members. a detection section;
a transmitter that transmits pressure information corresponding to the magnitude of the pressure detected by the pressure detector to the electronic whiteboard,
The electronic blackboard is
a contact position detection unit that detects a contact position of the electronic pen on a display screen of the electronic blackboard;
a data generation unit that generates drawing information in a form according to the pressure information transmitted from the transmission unit;
a display control unit that displays the drawing information generated by the data generation unit at a position corresponding to the contact position on the display screen;
Electronic blackboard system. An electronic blackboard system comprising an electronic pen and an electronic blackboard that displays drawing information drawn on a display screen of a display device by the electronic pen on the display screen,
The electronic pen is
an operation assisting part having one end fixed to the grip of the electronic pen, the other end being spaced apart from the grip, and having a protrusion protruding toward the grip in an intermediate part; ,
Pressure that detects the pressure with which the protrusion presses the grip when the grip of the electronic pen is gripped during writing and the other end of the operation assisting part is pressed down in a direction toward the grip. a detection section;
a transmitter that transmits pressure information corresponding to the magnitude of the pressure detected by the pressure detector to the electronic whiteboard,
The electronic blackboard is
a contact position detection unit that detects a contact position of the electronic pen on a display screen of the electronic blackboard;
a data generation unit that generates drawing information in a form according to the pressure information transmitted from the transmission unit;
a display control unit that displays the drawing information generated by the data generation unit at a position corresponding to the contact position on the display screen;
Electronic blackboard system. The pressure detection section is
A sensor is installed to extend in the longitudinal direction of the grip part to detect the pressure when the grip part of the electronic pen is gripped during writing, and when the grip part is gripped, the pressure of the electronic pen is adjusted according to the grip force. a plurality of flexure members provided along each side of the grip portion having an equilateral triangular cross section that flex toward the pen shaft; and a sheet-like pressure sensor that covers the outer periphery of the plurality of flexure members; an elastic member that covers the outer periphery of the pressure sensor, and when the grip part is gripped, the elastic member deforms into an arc shape along the outer periphery of the grip part, so that when the grip part is gripped, the elastic member deforms in an arc shape along the outer periphery of the grip part forming a circular arc region and a plane region connecting between the plurality of flexible members;
The electronic whiteboard system according to claim 1. One end side is fixed to the grip part of the electronic pen, and the other end side is installed with a distance from the grip part, and an operation assist part having a protrusion protruding toward the grip part side is provided in the middle part. In further preparation,
The pressure detection unit detects the pressure with which the protrusion presses the grip when the other end of the operation assist unit is pressed down in a direction toward the grip.
The electronic whiteboard system according to claim 1 or claim 2. A plurality of flexures are provided along each side of a grip having an equilateral triangular cross section along the own pen shaft , and are bent toward the own pen shaft in accordance with the gripping force of the grip. a pressure detection unit that detects the pressure when the gripping unit is gripped by the bending of the member ;
a transmitter that transmits pressure information to an electronic blackboard according to the magnitude of the pressure detected by the pressure detector;
electronic pen. a plurality of flexible members that are provided along the pen shaft of the user's own gripping portion and are bent toward the pen shaft in response to a gripping force for gripping the gripper; and a sheet that covers the outer periphery of the plurality of flexible members. and an elastic member that covers the outer periphery of the pressure sensor, and when the grip part is gripped, the plurality of flexible members formed by the elastic member extend along the outer periphery of the grip part. a pressure detection unit that detects, with the pressure sensor, a pressure when the gripping portion is gripped in a circular arc region deformed into an arc shape and a flat region connecting between the plurality of flexible members;
a transmitter that transmits pressure information to an electronic blackboard according to the magnitude of the pressure detected by the pressure detector;
electronic pen. an operation assisting section having one end fixed to the grip, the other end spaced apart from the grip, and having a protrusion protruding toward the grip at an intermediate portion;
a pressure detection unit that detects the pressure with which the protrusion presses the grip when the grip is gripped during writing and the other end of the operation assist unit is pressed down in a direction toward the grip; ,
a transmitter that transmits pressure information to an electronic blackboard according to the magnitude of the pressure detected by the pressure detector;
electronic pen.

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