JP5205746B2 - Handwriting input system - Google Patents

Description

  The present invention can detect at least one ultrasonic oscillation element that transmits an ultrasonic signal for detecting position coordinates, an infrared light emitting element or electromagnetic transmission element that transmits a light emission signal, and a writing state. An electronic pen having a sensor and at least one pen button switch; a receiving element for receiving the light emission signal emitted from the electronic pen during writing and floating writing; and at least two or more receiving the ultrasonic signals In a handwriting input system comprising an ultrasonic receiving element and having a main body capable of detecting position coordinates of the electronic pen in two writing states from a difference in arrival time between the light emission signal and the ultrasonic signal, the light emission signal Handwriting input system with function to obtain on / off information of pen switch and one or more pen button switches from the time interval between On.

  Conventionally, a circuit that transmits infrared or electromagnetic waves and ultrasonic waves, an electronic pen that includes a sensor that can detect that the pen tip is written, a receiving element that receives an infrared signal or electromagnetic wave signal transmitted from the electronic pen, A handwritten handwriting input system having a main body incorporating a plurality of receiving elements for receiving ultrasonic signals has been developed. In this handwriting input system, when writing with an electronic pen, the main body receives ultrasonic signals and infrared rays transmitted from the electronic pen by a plurality of receiving elements, measures the position coordinates of the electronic pen, and determines the position coordinates and the tip of the pen tip. The ON-OFF state is combined and detected as handwriting data. 2. Description of the Related Art There is known a handwriting input system that recognizes written characters and figures as handwritten handwriting data by continuously detecting handwriting data.

  A coordinate detection device using ultrasonic waves and infrared rays has no function other than coordinate detection. Recently, devices with mouse functions and other functions have appeared in the market. However, since complicated means are used to transmit information from the electronic pen, power consumption on the electronic pen side is high, frequent battery replacement, The outer shape was large due to the use of batteries.

Japanese Patent Application Laid-Open No. 2004-310598. Infrared rays are used to transmit pen pressure information and pen information during pen input using ultrasonic waves. The information transmission method is based on a bit string by turning on / off infrared rays. JP, 2004-302761, A Pen point pressure information and pen information are transmitted at the time of pen input by an ultrasonic wave. The information transmission method modulates infrared rays only when the state of the pen changes, and transmits the minimum infrared rays necessary for synchronization otherwise.

  In a coordinate input device using ultrasonic waves, information transmission other than coordinate detection is performed by serial communication using a cable or serial communication using an infrared light emitting element or an electromagnetic oscillation element using radio waves or light. For this reason, the power consumption on the electronic pen side is large, and the external shape has become large due to frequent battery replacement or use of a large battery. In the prior art, light is emitted many times by an infrared light emitting element that mainly transmits the transmission timing of ultrasonic waves, and bit correspondence and code communication are performed. For this reason, how to establish a communication method that is simple, less affected by noise, and consumes less power has been a major issue.

  The object of the present invention is to solve the above-described problems and to add a single light emission signal to a current single light emission signal without providing any special parts, and from that time interval, a pen switch and one or more pens Provided is a handwriting input system having a function capable of obtaining on / off information of a button switch.

The present invention has been made to solve the above-described problem, and includes at least one ultrasonic transmission element that transmits an ultrasonic signal for detecting position coordinates, and an infrared light emitting element that transmits a light emission signal, or An electromagnetic transmission element, a pen switch that is a sensor capable of detecting a writing state, an electronic pen including at least one pen button switch, and the light emission signal emitted from the electronic pen during writing and floating writing A receiving element for receiving and at least two or more ultrasonic receiving elements for receiving the ultrasonic signal, and the writing time of the electronic pen from the difference in arrival time between the emitted light signal and the ultrasonic signal transmitted periodically; and In a handwriting input system having a main body capable of detecting position coordinates at the time of floating writing, there are few times within a regular time interval for obtaining position coordinates of the electronic pen. Both sent more than once in a short time a light emission signal to obtain an on-off information of the pen switches and one or more pen button switches from the time interval between the emission signal, an infrared light-emitting signal at more regular intervals It is proposed that the handwriting input system has a function of obtaining information on the battery state by transmitting the first infrared signal once every two times but not transmitting the first infrared signal.

  In the present invention, in performing the position table measurement period of one electronic pen, two infrared light emission signals are sent from the electronic pen, and the pen switch and one or more pen button switches are determined from the time interval between the light emission signals. On / off information can be obtained.

  Since the light emission signal is increased only once, no additional parts are required, and the increase in power consumption of the electronic pen can be suppressed.

  The present invention is applied to a coordinate detection apparatus using ultrasonic waves and infrared rays. Usually, the ultrasonic signal attenuates exponentially as the distance from the electronic pen to the ultrasonic receiver increases. Detection of a position map using ultrasonic waves is usually 50 pps every 20 msec. On the other hand, since the ultrasonic velocity is 330 m / sec, for example, in the case of a coordinate detection device using 0.4 m square ultrasonic waves, the maximum detection distance between the ultrasonic receiver and the electronic pen is 0.4 m × 1.41. = 0.57 m, and the time is 0.57 m ÷ 330 m / sec = 1.8 msec. The remaining 90% or more time is not used for coordinate detection using ultrasonic waves. During this unused time, the infrared sensor receives the second infrared signal, measures the time interval between the first and second, and the pen switch, pen button switch 1 and pen button switch corresponding to the signal table in FIG. Get information on 2 on / off and insufficient battery.

  Hereinafter, the present invention will be described in more detail with reference to examples. 1 to 9 are schematic representations of simple configurations so that the device drawings are not complicated. The present invention is not limited to the following examples, and includes various modifications within the technical scope of the present invention. Moreover, in each Example, the same referential mark was attached | subjected about the same structure.

  FIG. 1 shows a block diagram of the handwriting input system of the present invention. The electronic pen 4 has a pen switch 7, a pen button switch 1, and a pen button switch 2, and when any one is pressed, infrared rays 6 are transmitted from the electronic pen 4 and received by the main body 1. Simultaneously, the ultrasonic wave 5 is transmitted from the electronic pen 4 and received by the main body 1 after a time proportional to the distance. Thereafter, after the time of information 1 to information 9 corresponding to the on / off state of the pen switch 7, the pen button switch 1, and the pen button switch 2 has elapsed, infrared rays 6 are transmitted again from the electronic pen 4 and received by the main body 1. Such information is communicated to a personal computer 3 connected via the USB cable 2.

  FIG. 2 shows a configuration diagram of the electronic pen of the present invention. The electronic pen 4 has a pen switch 7 for sensing a writing state at the tip, and the electronic pen 4 has a pen button switch 1 and a pen button switch 2 on the side. The electronic pen 4 is supplied with electric power from the battery 10 and is controlled by the circuit unit 11. Infrared light is emitted from the infrared LED 12, and ultrasonic waves are output from the ultrasonic oscillator 13.

  FIG. 3 is a block diagram of the electronic pen according to the present invention. The pen switch 4 is used for detection during writing of the electronic pen, and the pen button switch 1 and the pen button switch 2 are used for detection during floating writing in the mouse mode. The pen button switch 2 is used for the left button in the mouse mode. The switch information is individually communicated to the microcomputer. The correspondence between the mouse modes is communicated to the personal computer 3 as switch on / off information so that either method is acceptable. The battery supplies power to other blocks via a microcomputer. The battery is provided at reference numeral 10 in the electronic pen configuration diagram of FIG.

  The battery voltage is monitored by a battery voltage detection circuit, and an alarm is given to the microcomputer when the voltage falls below a specified voltage. The infrared LED light emitting circuit causes the infrared LED 12 to emit light in response to an instruction from the microcomputer. The ultrasonic transmission circuit vibrates the ultrasonic oscillation element 13 according to an instruction from the microcomputer and outputs an ultrasonic wave.

If one or more of the pen switch 7, the pen button switch 1, and the pen button switch 2 are on, the electronic pen 4 selects the information 1 to information 7 in the signal table shown in FIG. Emits light according to the light emission signal 1 timing diagram.
FIG. 4 shows a configuration diagram of the main body of the present invention. The main body 1 has one infrared sensor 15 and two ultrasonic receiving elements 15, and is connected to the personal computer 3 by the USB cable 2.

  FIG. 5 shows a main body block diagram of the present invention. The infrared light emission signal transmitted from the electronic pen is received by the infrared sensor, and the signal is amplified and filtered by the infrared reception circuit, converted into a pulse signal, and sent to the infrared signal analysis circuit. The infrared signal analysis circuit sends the signal to the two ultrasonic distance measurement circuits and the microcomputer.

  The ultrasonic signal transmitted from the electronic pen 4 propagates in the air at about 330 m / sec, is received by the two ultrasonic receiving elements 15 with a time delay corresponding to the distance, and the received ultrasonic signal is 2 The sine waveform is amplified and filtered by two ultrasonic receiving circuits and sent to two ultrasonic distance measuring circuits. This is shown in the ultrasonic signal timing diagram of FIG.

  The two ultrasonic distance measurement circuits start measuring time with the signal from the infrared signal analysis circuit, complete the time measurement with the signal from the two ultrasonic reception circuits, and calculate the two ultrasonic arrival times to the micro. Send to computer. Up to this point, the process is completed in a maximum of 1.8 msec. Thereafter, the microcomputer calculates the coordinate information of the electronic pen 4 from the flight time of the two ultrasonic waves. During the calculation of the coordinate information of the electronic pen 4, the second infrared light emission signal transmitted from the electronic pen 4 is received by the infrared sensor 14, and the signal is amplified and filtered by the infrared receiving circuit to become a pulse signal and become an infrared signal. Send to analysis circuit.

The infrared signal analysis circuit sends the signal to the microcomputer, and the microcomputer measures the time interval between the first signal and the second signal from the infrared signal analysis circuit, and the infrared light emission signal 1 timing table shown in FIG. Corresponding information 1 to information 8 is selected from the signal table, the pen switch, the pen button switch 1 and the pen button switch 2 are turned on and off from the signal table shown in FIG. F. To the personal computer 3. Also, the battery inadequate information starts from when at least one of the three types of switches of the electronic pen 4 is turned on by selecting the corresponding information 9 from the infrared light emission signal 1 timing table shown in FIG. The information is sent to the main body using the fact that there are two or more states that are completed when all the switches are turned off. Normally, the first infrared emission signal is sent every 20 msec, but the battery inadequate information is sent by not sending the first infrared emission signal once every two times. In that case, the infrared signal analysis circuit behaves as if an infrared light emission signal is sent in a pseudo manner once every two times, and measures two ultrasonic arrival times.

  In the infrared light emission signal 2 timing diagram shown in FIG. 9, the infrared light emission signal 1 timing diagram shown in FIG. 8 corresponds to one infrared light emission signal by responding to the infrared light emission signal two times or more. Even if ambient light noise is input to 14, malfunction can be prevented.

The handwritten handwriting input system block diagram of a present Example. The pen block diagram of a present Example. The pen block diagram of a present Example. The main body block diagram of a present Example. The main body block diagram of a present Example. The signal table of a present Example. FIG. 3 is an infrared light emission signal 1 timing diagram of the present embodiment. The ultrasonic signal timing diagram of a present Example. The infrared light emission signal 2 timing diagram of a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 USB cable 3 Personal computer 4 Electronic pen 5 Ultrasonic wave 6 Infrared 7 Pen switch 8 Pen button switch 1
9 Pen button switch 2
10 Battery 11 Circuit 12 Infrared LED
13 Ultrasonic Oscillator 14 Infrared Sensor 15 Ultrasonic Receiver

Claims (1)

It is a sensor that can detect at least one ultrasonic transmission element that transmits an ultrasonic signal for detecting position coordinates, an infrared light emitting element or electromagnetic transmission element that transmits a light emission signal, and a writing state. An electronic pen having a pen switch and one or more pen button switches, a receiving element for receiving the light emission signal emitted from the electronic pen during writing and floating writing, and at least two or more for receiving the ultrasonic signal A body capable of detecting position coordinates at the time of writing and floating writing of the electronic pen from a difference in arrival time between the light emission signal and the ultrasonic signal transmitted periodically. In a handwriting input system, the light emission signal is transmitted at least twice in a short time within a regular time interval for obtaining the position coordinates of the electronic pen. On / off information of the pen switch and one or more pen button switches is obtained from the time interval between signals, and an infrared emission signal is sent at regular time intervals. A handwriting input system characterized by having a function to obtain battery status information by not transmitting.

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