JP2009099041A - Pen type input device - Google Patents

Pen type input device Download PDF

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JP2009099041A
JP2009099041A JP2007271472A JP2007271472A JP2009099041A JP 2009099041 A JP2009099041 A JP 2009099041A JP 2007271472 A JP2007271472 A JP 2007271472A JP 2007271472 A JP2007271472 A JP 2007271472A JP 2009099041 A JP2009099041 A JP 2009099041A
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input
pen
character
contact
writing plane
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Hiromoto Goto
浩基 後藤
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SMK Corp
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SMK Corp
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<P>PROBLEM TO BE SOLVED: To provide a pen type input device which detects a moving track of a character input in which a pen point is temporarily separated away and can be made compact and lightened in weight. <P>SOLUTION: A three-dimensional acceleration sensor for detecting accelerations in X, Y and Z directions of the pen point is housed in the pen point of a pen-shaped case, a three-dimensional moving track is detected by continuously detecting an acceleration of the pen point for drawing a handwritten character on a writing plane from an input start till an input end, the writing plane is detected from the three-dimensional moving track, and a contact moving track belonging to the writing plane is extracted from the three-dimensional moving track. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、筆記平面に文字を描く入力操作の移動軌跡を検出し、文字認識装置へ出力することによって描いた文字を認識させるペン型入力装置に関する。   The present invention relates to a pen-type input device that recognizes a drawn character by detecting a movement locus of an input operation for drawing the character on a writing plane and outputting the detected locus to a character recognition device.

携帯電子機器へ文字データを入力する入力方法として、タブレットの入力面へ専用ペンを用いて入力しようとする文字を描き、タブレットで検出する入力操作面への入力操作軌跡の特徴から、文字認識装置が、描いた文字を認識し、携帯電子機器へ認識した文字を入力する方法が知られている。しかしながら、この入力方法は、タブレットと専用ペンを携帯電子機器とともに用意する必要があり、持ち運びする携帯機器への文字入力装置として適さないものであった。   As an input method for inputting character data to a portable electronic device, a character recognition device is created by drawing characters to be input using a dedicated pen on the input surface of the tablet and detecting the input operation trajectory on the input operation surface detected by the tablet. However, a method for recognizing a drawn character and inputting the recognized character to a portable electronic device is known. However, this input method needs to prepare a tablet and a dedicated pen together with a portable electronic device, and is not suitable as a character input device for a portable device to be carried.

そこで、タブレットを用いずに、入力操作するペン側で筆記平面に文字を描く移動軌跡を検出し、文字認識装置へ出力するペン型入力装置が提案されている。文字を描く移動軌跡を検出するためには、ペン型入力装置が自らの相対移動量及び移動方向を入力操作中に連続して検出する必要があるが、一筆で描けない文字は、文字入力操作中に、筆記平面からペン先が離れる区間があり、従来、筆記平面上の接触移動軌跡を、紙面に転がり接触するボールの回転方向と回転量で検出する他に、筆記平面からペン先が離れて移動する非接触移動軌跡を、ペン状ケースに内蔵の二次元加速度センサーで検出し、非接触移動軌跡で連続させた接触移動軌跡を文字認識装置へ出力していた（特許文献１）。   Therefore, a pen-type input device has been proposed that detects a movement trajectory of drawing a character on the writing plane on the pen side to be input without using a tablet, and outputs the detected locus to a character recognition device. In order to detect the movement trajectory of drawing a character, the pen-type input device must continuously detect its relative movement amount and direction during the input operation, but for characters that cannot be drawn with a single stroke, the character input operation Inside, there is a section where the pen tip moves away from the writing plane. Conventionally, the pen tip moves away from the writing plane in addition to detecting the contact movement trajectory on the writing plane based on the rotation direction and amount of rotation of the ball that rolls on the paper surface. The non-contact movement locus that moves is detected by a two-dimensional acceleration sensor built in the pen-like case, and the contact movement locus made continuous by the non-contact movement locus is output to the character recognition device (Patent Document 1).

図６は、この従来のペン型入力装置１００の構成を示し、ペン状ケース１０１内に、ペン先から一部が突出するように、ボール１０２が回転自在に収容されている。ボール１０２の回転は、ボール１０２に接触するボール回転センサー１０３により、ペン状ケース１０１の軸方向に直交するＸ、Ｙ方向の回転量に分けて検出され、ペン先のＸ、Ｙ方向の移動軌跡が測定される。また、ボール１０２の基端側（図中右側）に接触状態判別部１０４が備えられ、ボール１０２に加わる押圧力を検出して、ペン型入力装置１００のペン先の筆記平面への接触を検知している。   FIG. 6 shows a configuration of this conventional pen-type input device 100, and a ball 102 is rotatably accommodated in a pen-like case 101 so that a part protrudes from the pen tip. The rotation of the ball 102 is detected by the ball rotation sensor 103 in contact with the ball 102 in the amount of rotation in the X and Y directions orthogonal to the axial direction of the pen-like case 101, and the movement trajectory of the pen tip in the X and Y directions. Is measured. Further, a contact state determination unit 104 is provided on the base end side (right side in the drawing) of the ball 102 to detect the pressing force applied to the ball 102 and detect the contact of the pen tip of the pen type input device 100 with the writing plane. is doing.

接触状態判別部１０４の更に基端側には、Ｘ方向の加速度を検出するＸ方向加速度センサー１０５ａとＹ方向の加速度を検出するＹ方向加速度センサー１０５ｂとからなる二次元加速度センサー１０５がペン状ケース１０１内に収容され、検出するＸ、Ｙ方向の加速度からペン状ケース１０１のＸ、Ｙ方向の移動軌跡を測定している。   A two-dimensional acceleration sensor 105 including an X-direction acceleration sensor 105a for detecting X-direction acceleration and a Y-direction acceleration sensor 105b for detecting Y-direction acceleration is provided on the further proximal side of the contact state determination unit 104. The movement trajectory of the pen-like case 101 in the X and Y directions is measured from the acceleration in the X and Y directions that are housed and detected.

接触状態判別部１０４の出力側に接続するＣＰＵ１０６は、接触状態判別部１０４がペン先が筆記平面に接触を検知している間に、ボール回転センサー１０３が測定したＸ、Ｙ方向の移動軌跡を接触移動軌跡と、筆記平面への接触を検知していない間に、二次元加速度センサー１０５が測定したＸ、Ｙ方向の移動軌跡を非接触移動軌跡とし、ペン先が離れて途切れる接触移動軌跡間のＸＹ平面（筆記平面）上の相対位置を、その間の非接触移動軌跡で連続させて得ている。また、ＣＰＵ１０６は、接触状態判別部１０４が非接触を検知してから所定期間接触を検知しないことから、１文字分の文字入力が終了したとみなし、ＸＹ平面（筆記平面）上の相対位置が特定された複数の接触移動軌跡から１文字分の手書き文字情報を得る。   The CPU 106 connected to the output side of the contact state determination unit 104 indicates the movement trajectory in the X and Y directions measured by the ball rotation sensor 103 while the contact state determination unit 104 detects contact of the pen tip with the writing plane. While the contact movement locus and the contact with the writing plane are not detected, the movement locus in the X and Y directions measured by the two-dimensional acceleration sensor 105 is set as a non-contact movement locus, and the contact movement locus between the contact movement locus where the pen tip is separated and disconnected. The relative positions on the XY plane (writing plane) are continuously obtained by a non-contact movement locus therebetween. Further, since the contact state determination unit 104 does not detect contact for a predetermined period after the contact state determination unit 104 detects non-contact, the CPU 106 considers that character input for one character has been completed, and the relative position on the XY plane (writing plane) is Handwritten character information for one character is obtained from the plurality of identified contact movement trajectories.

ＣＰＵ１０６は、更に１文字分の手書き文字情報からその特徴を抽出して、メモリ１０７に記憶されている多数の文字の特徴データと比較し、主要な特徴が一致している文字を手書きした文字と認識する。このペン型入力装置１００は、携帯電話機を兼ねるものであり、認識した文字の文字列からなる電話番号を電話回路１０８へ出力し、アンテナ１０９を用いて相手先を呼び出す。   The CPU 106 further extracts the feature from the handwritten character information for one character, compares it with the feature data of a large number of characters stored in the memory 107, recognize. This pen-type input device 100 also serves as a mobile phone, outputs a telephone number composed of a recognized character string to the telephone circuit 108, and calls the other party using the antenna 109.

特開２０００−９９２５１号公報（明細書段落００１０乃至００１３、図１）JP 2000-99251 A (paragraphs 0010 to 0013, FIG. 1)

この従来のペン型入力装置１００では、筆記平面に文字を描く接触移動軌跡と、筆記平面からペン先を離して移動させる非接触移動軌跡とを、ボール１０２及びボール回転センサー１０３と、二次元加速度センサー１０５の二種類のセンサーを用いて測定するので、構造が複雑で入力装置全体が大型化し、小型、軽量化が求められるペン型の入力装置の障害となっていた。   In the conventional pen-type input device 100, a contact movement locus for drawing a character on the writing plane, and a non-contact movement locus for moving the pen tip away from the writing plane, the ball 102, the ball rotation sensor 103, and the two-dimensional acceleration. Since measurement is performed using two types of sensors, the sensor 105, the structure is complicated, the entire input device is enlarged, and this is an obstacle to a pen-type input device that is required to be smaller and lighter.

また、接触移動軌跡と非接触移動軌跡とを、接触状態判別部においてペン先のボール１０２に加わる筆圧を検出して識別しているが、１文字分の文字入力を終えた際にも、筆記平面からペン先を離すので、文字入力中にペン先を離す移動と識別できない。そこで、文字入力中に筆記平面からペン先が離れる非接触移動時間より長い時間を超えたときに１文字分の文字入力が終了したものとしている。   Further, the contact movement trajectory and the non-contact movement trajectory are identified by detecting the writing pressure applied to the ball 102 of the pen tip in the contact state determination unit, but when the character input for one character is finished, Since the pen tip is separated from the writing plane, it cannot be distinguished from the movement of releasing the pen tip during character input. Therefore, it is assumed that character input for one character is completed when a time longer than the non-contact movement time during which the pen tip is separated from the writing plane during character input is exceeded.

しかしながら、文字入力中に入力を停止しても、１文字分の文字入力が終了したとみなされる場合があり、誤認識若しくは認識エラーとなる場合があり、また、１文字を入力する毎に、所定時間が経過するまで認識結果が得られないので、文字認識処理時間を短縮させることができないという問題があった。   However, even if input is stopped during character input, it may be considered that character input for one character has been completed, which may result in erroneous recognition or a recognition error, and every time one character is input, Since a recognition result cannot be obtained until a predetermined time has elapsed, there has been a problem that the character recognition processing time cannot be shortened.

また、ペン状ケース１０１のペン先は限られた空間であるにもかかわらず、ペン先の接触移動軌跡やペン先の筆記平面への接触有無を検出するために、ボール１０２、ボール回転センサー１０３、接触状態判別部などを配置しているので、非接触移動軌跡を判別する二次元センサーは、ペン先から離れたペン状ケース１０１の中間に収容している。その結果、ペン先を移動させるためにペン状ケース１０１を傾けただけでもペン先の移動とご認識し、非接触移動軌跡にペン状ケース１０１の傾斜による誤差が含まれ、文字認識率が低下するという問題があった。   In addition, although the pen tip of the pen-like case 101 is a limited space, the ball 102 and the ball rotation sensor 103 are used to detect the contact movement trajectory of the pen tip and the presence / absence of contact of the pen tip with the writing plane. Since the contact state determination unit and the like are arranged, the two-dimensional sensor for determining the non-contact movement locus is accommodated in the middle of the pen-like case 101 away from the pen tip. As a result, even if the pen case 101 is tilted to move the pen tip, it is recognized as the movement of the pen tip, and the error due to the tilt of the pen case 101 is included in the non-contact movement locus, and the character recognition rate decreases. There was a problem to do.

本発明は、このような従来の問題点を考慮してなされたものであり、ペン先が一時的に離れる文字入力の移動軌跡を簡易構造で検出し、小型、軽量化が可能なペン型入力装置を提供することを目的とする。   The present invention has been made in consideration of such conventional problems, and a pen-type input capable of detecting a moving path of a character input in which the pen tip is temporarily separated with a simple structure, which can be reduced in size and weight. An object is to provide an apparatus.

また、１文字入力の終了後に所定時間待機せず、文字入力中のペン先移動と１文字入力の終了とを明確に識別できるペン型入力装置を提供することを目的とする。   It is another object of the present invention to provide a pen-type input device that can clearly identify the movement of the pen tip during character input and the end of one character input without waiting for a predetermined time after the end of one character input.

上述の目的を達成するため、請求項１のペン型入力装置は、ペン状ケースのペン先に収容され、ペン先の互いに直交するＸ、Ｙ、Ｚ方向の加速度（αｘ、αｙ、αｚ）を検出する三次元加速度センサと、ペン状ケースに取り付けられ、筆記平面上に描く手書き文字毎の入力終了時を表す入力終了信号を入力する文字区切りスイッチと、三次元加速度センサで検出する加速度（αｘ、αｙ、αｚ）と、筆記平面上の入力開始位置でペン先を停止させた入力開始時から該ペン先の加速度（αｘ、αｙ、αｚ）を検出するまでの経過時間ｔとから、経過時間ｔにおける入力開始位置からＸ、Ｙ、Ｚ方向の相対移動距離を入力開始時から入力終了時まで連続して求め、手書き文字毎のペン先の三次元移動軌跡を検出する軌跡検出部と、三次元移動軌跡から、筆記平面をペン先が接触しながら移動する接触移動軌跡を抽出する移動軌跡抽出部とを備え、手書き文字毎に、筆記平面上に描いた手書き文字の接触移動軌跡を、文字認識装置へ出力することを特徴とする。   In order to achieve the above-mentioned object, the pen-type input device according to claim 1 is accommodated in the pen tip of the pen-shaped case, and accelerations (αx, αy, αz) in the X, Y, and Z directions of the pen tip that are orthogonal to each other. A three-dimensional acceleration sensor to be detected, a character delimiter switch that is attached to a pen-like case and that inputs an input end signal representing the end of input for each handwritten character drawn on the writing plane, and an acceleration (αx detected by the three-dimensional acceleration sensor , Αy, αz) and the elapsed time t from the start of input when the pen tip is stopped at the input start position on the writing plane until the acceleration (αx, αy, αz) of the pen tip is detected. a trajectory detection unit that continuously obtains relative movement distances in the X, Y, and Z directions from the input start position at t from the start of input to the end of input, and detects a three-dimensional movement trajectory of the pen tip for each handwritten character; From the original trajectory, A movement locus extraction unit that extracts a contact movement locus that moves while the pen tip is in contact with the writing plane, and outputs a contact movement locus of the handwritten character drawn on the writing plane to the character recognition device for each handwritten character. It is characterized by that.

三次元加速度センサーが文字入力操作中に検出するペン先のＸ、Ｙ、Ｚ方向の加速度から、ペン先の三次元移動軌跡が得られる。軌跡検出部は、文字区切りスイッチの入力で入力開始時から入力終了時までの１文字毎に区切られた三次元移動軌跡を検出する。三次元加速度センサーは、筆記平面上に文字を描く軌跡と同一に移動するペン先に収容されているので、三次元移動軌跡の全体は、筆記平面と平行に形成され、移動軌跡抽出部は、三次元移動軌跡を、筆記平面に属する接触移動軌跡と、筆記平面から離れた非接触移動軌跡に分け、非接触移動軌跡により筆記平面上の相対位置が特定される接触移動軌跡を抽出することができる。移動軌跡抽出部により抽出された筆記平面に属する接触移動軌跡は、手書き文字毎に文字認識装置へ出力される。   A three-dimensional movement trajectory of the pen tip is obtained from accelerations in the X, Y, and Z directions detected by the three-dimensional acceleration sensor during the character input operation. The trajectory detection unit detects a three-dimensional movement trajectory divided for each character from the start of input to the end of input by input of a character separator switch. Since the 3D acceleration sensor is accommodated in the pen tip that moves in the same way as the trajectory for drawing characters on the writing plane, the entire 3D moving trajectory is formed parallel to the writing plane. It is possible to divide the three-dimensional movement locus into a contact movement locus belonging to the writing plane and a non-contact movement locus away from the writing plane, and extract a contact movement locus whose relative position on the writing plane is specified by the non-contact movement locus. it can. The contact movement locus belonging to the writing plane extracted by the movement locus extraction unit is output to the character recognition device for each handwritten character.

請求項２のペン型入力装置は、ペン状ケースの先端に、筆記平面にペン先が接触した際に接触信号を出力する接触センサーが取り付けられ、移動軌跡抽出部は、接触センサーから接触信号が入力されている間の三次元移動軌跡を接触移動軌跡として抽出することを特徴とする。   In the pen-type input device according to claim 2, a contact sensor that outputs a contact signal when the pen tip contacts the writing plane is attached to the tip of the pen-shaped case, and the movement trajectory extraction unit receives the contact signal from the contact sensor. A three-dimensional movement trajectory during input is extracted as a contact movement trajectory.

三次元相対移動軌跡を検出するためにペン先に収容される三次元加速度センサーは、ボールとボール回転センサーのような複雑で大型な機構ではないので、補助的にペン先と筆記平面との接触を検知する接触センサーをペン先に配置することができる。   The 3D accelerometer housed in the pen tip for detecting the 3D relative movement trajectory is not a complicated and large mechanism like the ball and ball rotation sensor. It is possible to arrange a contact sensor for detecting the point on the pen tip.

移動軌跡抽出部は、接触信号の入力有無によって、三次元移動軌跡の接触移動軌跡と非接触移動軌跡を、正確に判別できる。   The movement trajectory extraction unit can accurately determine the contact movement trajectory and the non-contact movement trajectory of the three-dimensional movement trajectory depending on whether or not a contact signal is input.

請求項１の発明によれば、三次元加速度センサーをペン先の先端に配置するので、検出される三次元移動軌跡に、ペン状ケースを傾斜させることによって生じる誤差が最小となり、手書き文字の軌跡を表す接触移動軌跡を正確に検出できる。   According to the first aspect of the present invention, since the three-dimensional acceleration sensor is arranged at the tip of the pen tip, an error caused by inclining the pen-like case to the detected three-dimensional movement locus is minimized, and the locus of handwritten characters is reduced. Can be accurately detected.

また、手書き文字入力中に筆記平面からペン先が離れる非接触移動軌跡を三次元加速度センサーで検出し、手書き文字入力後に筆記平面から離れる文字区切りを、文字区切りスイッチの入力で判別するので、両者を明確に判別できる。   In addition, the non-contact movement trajectory where the pen tip moves away from the writing plane during handwritten character input is detected by a three-dimensional acceleration sensor, and the character separation that leaves the writing plane after handwritten character input is determined by the input of the character separation switch. Can be clearly identified.

また、ペン先の接触移動軌跡を、三次元加速度センサーのみで検出するので、検出構造が単純化され、ペン型入力装置を小型、軽量化することができる。   Further, since the contact movement locus of the pen tip is detected only by the three-dimensional acceleration sensor, the detection structure is simplified, and the pen-type input device can be reduced in size and weight.

請求項２の発明によれば、１文字の入力終了を入力する文字区切りスイッチと別に、接触移動軌跡と非接触移動軌跡を判別する接触センサーを備えるので、入力終了信号と接触信号を明確に判別できる。   According to the invention of claim 2, since the contact sensor for discriminating the contact movement locus and the non-contact movement locus is provided in addition to the character separation switch for inputting the input completion of one character, the input end signal and the contact signal are clearly discriminated. it can.

以下、本発明の一実施の形態に係るペン型入力装置１を、図１と図２を用いて説明する。図１に示すように、ペン型入力装置１は、自らの相対移動軌跡を検出することにより、操作者がペン型入力装置１を用いて筆記平面１０に描いた手書き文字の移動軌跡を検出し、この移動軌跡を図示しない文字認識装置へ出力して、その特徴から手書き文字を文字認識させるものである。従って、ペン型入力装置１は、手に持って筆記平面１０に文字を描く筆記具に似せたペン状ケース２を備え、そのペン先内に、ペン先の相対移動を検出する為の三次元加速度センサー３を収容している。   Hereinafter, a pen-type input device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the pen-type input device 1 detects the movement trajectory of a handwritten character drawn on the writing plane 10 by the operator using the pen-type input device 1 by detecting its own relative movement trajectory. The movement trajectory is output to a character recognition device (not shown), and handwritten characters are recognized from the characteristics. Accordingly, the pen-type input device 1 includes a pen-like case 2 that resembles a writing instrument that draws a character on the writing plane 10 by hand, and the three-dimensional acceleration for detecting the relative movement of the pen tip in the pen tip. The sensor 3 is accommodated.

三次元加速度センサー３は、ペン状ケース２の軸方向をＺ方向として、ペン先の互いに直交するＸ、Ｙ、Ｚ方向の加速度をそれぞれ検出する３個の加速度センサー３ｘ、３ｙ、３ｚで構成されている。加速度センサー３ｘ、３ｙ、３ｚは、加速度による変形に応じた電圧を発生する圧電基板を用いた圧電型の他、静電容量型やピエゾ抵抗型など、加速度に応じて直線性のある出力信号が得られれば、任意のセンサーを用いることができる。   The three-dimensional acceleration sensor 3 includes three acceleration sensors 3x, 3y, and 3z that detect accelerations in the X, Y, and Z directions perpendicular to each other with the pen tip case 2 as the Z direction. ing. Each of the acceleration sensors 3x, 3y, and 3z outputs a linear output signal according to acceleration, such as a capacitance type or a piezoresistive type, in addition to a piezoelectric type that uses a piezoelectric substrate that generates a voltage corresponding to deformation due to acceleration. If obtained, any sensor can be used.

ペン型入力装置１を筆記平面１０に対して傾けてペン先を筆記平面１０上で移動させると、ペン先の移動方向の加速度αは、Ｘ、Ｙ、Ｚ方向の加速度成分αｘ、αｙ、αｚに分けて、加速度センサー３ｘ、３ｙ、３ｚで検出される（図２参照）。   When the pen-type input device 1 is tilted with respect to the writing plane 10 and the pen tip is moved on the writing plane 10, the acceleration α in the movement direction of the pen tip becomes an acceleration component αx, αy, αz in the X, Y, and Z directions. The acceleration sensors 3x, 3y, and 3z are detected separately (see FIG. 2).

三次元センサー３の出力側には、ローパスフィルター、信号増幅回路、Ａ／Ｄコンバータなどから構成されるサンプリング部４が接続し、加速度センサー３ｘ、３ｙ、３ｚが検出する加速度αｘ、αｙ、αｚを表す信号を増幅し、後段のマイコン回路５が処理可能なデジタル信号に変換して出力する。   A sampling unit 4 composed of a low-pass filter, a signal amplification circuit, an A / D converter, and the like is connected to the output side of the three-dimensional sensor 3, and accelerations αx, αy, αz detected by the acceleration sensors 3x, 3y, 3z are detected. The signal to be expressed is amplified, converted into a digital signal that can be processed by the microcomputer circuit 5 in the subsequent stage, and output.

マイコン回路５は、加速度センサー３ｘ、３ｙ、３ｚがそれぞれペン先を移動期間中に連続して検出する加速度αｘ、αｙ、αｚから、ペン先の三次元移動軌跡を検出する軌跡抽出部と、三次元移動軌跡から筆記平面１０にペン型入力装置１のペン先が接触しながら移動する接触移動軌跡を抽出する移動軌跡抽出部とを兼ねている。   The microcomputer circuit 5 includes a trajectory extraction unit that detects a three-dimensional movement trajectory of the pen tip from accelerations αx, αy, and αz that the acceleration sensors 3x, 3y, and 3z continuously detect the pen tip during the movement period, and a tertiary It also serves as a movement locus extraction unit that extracts a contact movement locus that moves while the pen tip of the pen-type input device 1 is in contact with the writing plane 10 from the original movement locus.

マイコン５による三次元移動軌跡の検出は、１文字を筆記平面１０に描く入力開始時から入力終了時まで連続してペン先の加速度αｘ、αｙ、αｚを連続して求める。入力開始時からｔ時間経過した際に加速度センサー３ｘ、３ｙ、３ｚが検出した加速度αｘ、αｙ、αｚを時間ｔについて２度積分した値は、微小時間前の位置からのＸ、Ｙ、Ｚ方向の相対移動距離を表す。筆記平面上の所定の入力開始位置（原点）でペン先を一定時間停止させた状態を入力開始時とすると、入力開始時のペン先の位置は、原点（０，０，０）で、Ｘ、Ｙ、Ｚ方向の移動速度が０となる初期条件が得られる。この初期条件と、入力開始時から連続して検出する加速度αｘ、αｙ、αｚを用いて、検出した加速度αｘ、αｙ、αｚを経過時間ｔで２度積分し、微小時間前の位置からのＸ、Ｙ、Ｚ方向の相対移動距離を、入力開始時から経過時間ｔまで求めれば、経過時間ｔにおける入力開始位置（原点）に対する相対位置が得られ、マイコン５は、これを１文字を入力する入力開始時から入力終了時まで算出して三次元移動軌跡を検出する。   The detection of the three-dimensional movement locus by the microcomputer 5 continuously obtains the pen tip accelerations αx, αy, αz continuously from the start of input to the end of input of drawing one character on the writing plane 10. The values obtained by integrating the accelerations αx, αy, αz detected by the acceleration sensors 3x, 3y, 3z with respect to time t when t time elapses from the start of input are X, Y, Z directions from the position a minute before. The relative movement distance of. If the state where the pen tip is stopped at a predetermined input start position (origin) on the writing plane for a certain period of time is the start of input, the pen tip position at the start of input is the origin (0, 0, 0) and X An initial condition in which the moving speed in the Y, Z and Z directions is zero is obtained. Using this initial condition and the accelerations αx, αy, αz that are continuously detected from the start of input, the detected accelerations αx, αy, αz are integrated twice at the elapsed time t, and X If the relative movement distance in the Y, Z directions is obtained from the input start to the elapsed time t, the relative position with respect to the input start position (origin) at the elapsed time t can be obtained, and the microcomputer 5 inputs one character. A three-dimensional movement trajectory is detected by calculating from the start of input to the end of input.

マイコン５には、この１文字の区切りを表す入力終了時を検知するために、文字区切りスイッチ６が接続されている。文字区切りスイッチ６は、操作者が入力操作しやすいように、操作摘みがペン状ケース２の中間に露出して取り付けられ、１文字分の文字入力を終えて、操作者が文字区切りスイッチ６を入力操作すると、入力終了時を表す入力終了信号がマイコン５に出力される。   A character delimiter switch 6 is connected to the microcomputer 5 in order to detect the end of input representing the delimiter of one character. The character separation switch 6 is attached so that the operation knob is exposed in the middle of the pen-shaped case 2 so that the operator can easily perform an input operation. After the character input for one character is completed, the operator presses the character separation switch 6. When an input operation is performed, an input end signal indicating the end of input is output to the microcomputer 5.

操作者による筆記平面１０へ文字を描く際には、ペン先が筆記平面１０に沿って移動するので、軌跡抽出部が検出する三次元移動軌跡は、概ね筆記平面１０である一平面に沿って形成され、移動軌跡抽出部は、入力開始位置（原点）が筆記平面１０に属する平面であって、平面に属する三次元移動軌跡が最も長くなる仮想平面を筆記平面１０とし、仮想平面に属する三次元移動軌跡を接触移動軌跡と、仮想平面から一側に離れた三次元移動軌跡を非接触移動軌跡とする。   When the operator draws a character on the writing plane 10, the pen tip moves along the writing plane 10, so that the three-dimensional movement locus detected by the locus extraction unit is substantially along one plane that is the writing plane 10. The movement trajectory extraction unit formed is a plane whose input start position (origin) belongs to the writing plane 10 and has the longest three-dimensional movement trajectory belonging to the plane as the writing plane 10, and a tertiary belonging to the virtual plane. The original movement trajectory is a contact movement trajectory, and the three-dimensional movement trajectory that is one side away from the virtual plane is a non-contact movement trajectory.

三次元移動軌跡を接触移動軌跡を抽出する他の方法としては、例えば、入力開始位置（原点）に属し、三次元移動軌跡に接する仮想平面を筆記平面１０とし、検出誤差を含めて仮想平面に接近する三次元移動軌跡を接触移動軌跡と、仮想平面から一定距離以上隔てた三次元移動軌跡を非接触移動軌跡としてもよい。   As another method of extracting the contact movement locus from the three-dimensional movement locus, for example, the virtual plane that belongs to the input start position (origin) and is in contact with the three-dimensional movement locus is the writing plane 10, and the detection plane includes the detection plane. The approaching three-dimensional movement locus may be the contact movement locus, and the three-dimensional movement locus separated from the virtual plane by a certain distance or more may be the non-contact movement locus.

マイコン５が抽出した１文字分の接触移動軌跡は、無線通信回路６から図示しない文字認識装置へ送信される。この接触移動軌跡は、筆記平面１０に描いた１文字分の文字形態を表すので、文字認識装置では、接触移動軌跡を１文字分の文字情報として正規化し、その特徴を予め記憶している多数の文字の特徴と比較し、特徴が近似している文字を、ペン型入力装置１により手書きした文字と認識する。   The contact movement locus for one character extracted by the microcomputer 5 is transmitted from the wireless communication circuit 6 to a character recognition device (not shown). Since this contact movement locus represents a character form for one character drawn on the writing plane 10, the character recognition device normalizes the contact movement locus as character information for one character and stores its features in advance. Compared with the character feature of the character, the character whose feature is approximated is recognized as a handwritten character by the pen-type input device 1.

尚、このペン型入力装置１は、手書きが容易なペン型として、文字認識装置とケーブルで接続しないので、三次元加速度センサー３、マイコン５、無線通信回路７等の駆動電源となるバッテリー８を、ペン状ケース２内に内蔵している。   Since the pen-type input device 1 is a pen-type that is easy to write by hand and is not connected to the character recognition device by a cable, a battery 8 serving as a driving power source for the three-dimensional acceleration sensor 3, the microcomputer 5, the wireless communication circuit 7 and the like is provided. , Built in the pen-like case 2.

この第１実施の形態に係るペン型入力装置１によれば、三次元加速度センサー３を、手書き文字を描くペン先に収容しているので、検出する三次元移動軌跡にペン状ケース２を傾けることにより生じる誤差が最小となり、筆記平面１０とペン先との接触を検知せずに、接触移動軌跡を抽出できる。また、文字区切りスイッチ６の入力操作により、手書き文字毎の入力終了時を表す入力終了信号を出力するので、筆記平面１０からペン先が離れる経過時間から入力終了を判別する必要がなく、文字認識処理時間が短縮される。   According to the pen-type input device 1 according to the first embodiment, since the three-dimensional acceleration sensor 3 is accommodated in the pen tip for drawing handwritten characters, the pen-shaped case 2 is tilted to the three-dimensional movement locus to be detected. The error caused by this is minimized, and the contact movement trajectory can be extracted without detecting the contact between the writing plane 10 and the pen tip. Further, since an input end signal indicating the end of input for each handwritten character is output by the input operation of the character separation switch 6, there is no need to determine the end of input from the elapsed time when the pen tip moves away from the writing plane 10, and character recognition Processing time is reduced.

第１実施の形態では、三次元加速度センサー３が検出する三次元移動軌跡のみから筆記平面１０に沿った接触移動軌跡を抽出するので、三次元移動軌跡に誤差が生じると正確に接触移動軌跡と非接触移動軌跡を判別できない。第２実施の形態に係るペン型入力装置は、この問題を上述と同一構成のペン型入力装置１を用いて解決するものであり、三次元移動軌跡に多少の誤差を含んでいても、正確に接触移動軌跡を抽出できる。   In the first embodiment, the contact movement trajectory along the writing plane 10 is extracted only from the three-dimensional movement trajectory detected by the three-dimensional acceleration sensor 3. Therefore, if an error occurs in the three-dimensional movement trajectory, the contact movement trajectory is accurately determined. The non-contact movement trajectory cannot be determined. The pen-type input device according to the second embodiment solves this problem by using the pen-type input device 1 having the same configuration as described above, and even if the three-dimensional movement trajectory includes some errors, it is accurate. The contact movement trajectory can be extracted.

以下、この第２実施の形態を、図１乃至図４で説明する。第２実施の形態に係るペン型入力装置１によりペン先の三次元移動軌跡を検出する方法は、第１実施の形態と同一であるので省略する。この実施の形態では、ペン先を筆記平面１０上に描く接触移動軌跡と、筆記平面１０からペン先が離れる非接触移動軌跡とを、文字区切りスイッチ６の入力で判別する。すなわち、操作者は、ペン先を筆記平面１０上に接触させて文字を描いている間に連続して文字区切りスイッチ６を入力し、文字区切りスイッチ６から接触移動時間中であることを示す接触移動信号をマイコン回路５へ出力するものである。   Hereinafter, the second embodiment will be described with reference to FIGS. The method for detecting the three-dimensional movement trajectory of the pen tip by the pen-type input device 1 according to the second embodiment is the same as that in the first embodiment, and is therefore omitted. In this embodiment, a contact movement trajectory in which the pen tip is drawn on the writing plane 10 and a non-contact movement trajectory in which the pen tip is separated from the writing plane 10 are discriminated by input of the character separation switch 6. That is, the operator inputs the character separation switch 6 continuously while drawing the character by bringing the pen tip into contact with the writing plane 10, and the contact indicating that the contact movement time is in progress from the character separation switch 6. The movement signal is output to the microcomputer circuit 5.

以下、この第２実施の形態に係るペン型入力装置１により接触移動軌跡を抽出する方法を、筆記平面１０へ平仮名「に」の文字を手書きする場合を示す図３、図４で詳述する。手書き文字入力を開始する入力開始時ｔ０では、第１実施の形態と同様に、筆記平面１０上の入力開始位置（原点）でペン先を一定時間停止させ、入力開始時のペン先の位置（イの開始位置）を原点（０，０，０）、Ｘ、Ｙ、Ｚ方向の移動速度を０とする初期条件に設定する。   Hereinafter, a method of extracting the contact movement locus by the pen-type input device 1 according to the second embodiment will be described in detail with reference to FIGS. 3 and 4 showing the case where the character “Ni” is handwritten on the writing plane 10. . At the input start time t0 when the handwritten character input is started, the pen tip is stopped for a certain period of time at the input start position (origin) on the writing plane 10 as in the first embodiment, and the pen tip position ( (I) (start position) is set to the initial condition in which the origin (0, 0, 0) and the moving speed in the X, Y, and Z directions are set to zero.

この入力開始時ｔ０に文字区切りスイッチ６を入力し、文字区切りスイッチ６の入力を継続させた状態で、筆記平面１０に図中「イ」の部分を描くようにペン先を接触移動させる。入力開始時ｔ０から微小時間Δｔ後に加速度センサー３ｘ、３ｙ、３ｚが検出した加速度αｘ、αｙ、αｚを時間ｔについて２度積分した値は、入力開始時ｔ０の初期条件から、原点（０，０，０）からのＸ、Ｙ、Ｚ方向の相対移動距離、つまり入力開始位置を原点とするＸＹＺ座標系で表される位置を表す。   At the input start time t0, the character separation switch 6 is input, and the input of the character separation switch 6 is continued, and the pen tip is moved in contact with the writing plane 10 so as to draw a portion “a” in the drawing. A value obtained by integrating the accelerations αx, αy, αz detected by the acceleration sensors 3x, 3y, 3z twice with respect to the time t after the minute time Δt from the input start time t0 is the origin (0, 0) from the initial condition at the input start time t0. , 0) represents the relative movement distance in the X, Y, and Z directions, that is, the position represented by the XYZ coordinate system with the input start position as the origin.

マイコン５は、入力開始時ｔ０から以後、後述する入力終了時ｔ６まで、ペン先が筆記平面１０に接触しているか否かにかかわらず、連続して加速度センサー３ｘ、３ｙ、３ｚが検出する加速度αｘ、αｙ、αｚを時間ｔについて２度積分し、直前の位置に対するＸ、Ｙ、Ｚ方向の相対移動距離から三次元移動軌跡を得る。   The microcomputer 5 continuously detects accelerations detected by the acceleration sensors 3x, 3y, and 3z regardless of whether the pen tip is in contact with the writing plane 10 from the input start time t0 to the input end time t6 described later. αx, αy, and αz are integrated twice with respect to time t, and a three-dimensional movement locus is obtained from the relative movement distances in the X, Y, and Z directions with respect to the immediately preceding position.

筆記平面１０に図中「イ」の部分を描いた後に、文字区切りスイッチ６の入力操作を解除し、「ハ」の部分を描き始める位置まで、ペン先を筆記平面１０から離して「ロ」の部分を移動させる。「ハ」の部分を描く間には、再び文字区切りスイッチ６を連続入力操作し、同様にして、「に」の文字を描くように、「ニ」、「ホ」とペン先を移動させ、ペン先を筆記平面１０へ接触させている区間「イ」、「ハ」、「ホ」のみ、図４に示すように、文字区切りスイッチ６を連続入力操作する。   After drawing the part “a” in the drawing on the writing plane 10, cancel the input operation of the character separator switch 6, and move the pen tip away from the writing plane 10 until the position where the “c” part begins to be drawn. Move the part. While drawing “C”, the character separation switch 6 is continuously input again, and in the same manner, “ni”, “e”, and the pen tip are moved so as to draw “I”. As shown in FIG. 4, the character separation switch 6 is continuously input only in the sections “I”, “C”, and “E” where the pen tip is in contact with the writing plane 10.

「に」の文字の手書き入力操作を終えた後、ペン先を筆記平面１０から離した（「ヘ」の部分）入力終了時ｔ６に、文字区切りスイッチ６を入力操作し、入力終了時を表す入力終了信号をマイコン回路５へ出力する。   After completing the handwriting input operation for the character “ni”, the pen tip is moved away from the writing plane 10 (part “f”). At the end of input t6, the character separation switch 6 is input to indicate the end of input. An input end signal is output to the microcomputer circuit 5.

これにより、移動軌跡抽出部であるマイコン５は、入力開始時から入力終了時までの三次元移動軌跡（イ乃至ヘ）のうち、文字区切りスイッチ６から接触移動信号が入力されている三次元移動軌跡（イ、ハ、ホ）を接触移動軌跡と、接触移動信号が入力されていない三次元移動軌跡（ロ、ニ、ヘ）を非接触移動軌跡として、手書き文字「に」を構成する接触移動軌跡を抽出する。   Thereby, the microcomputer 5 which is the movement locus extraction unit, among the three-dimensional movement locus (A to F) from the input start time to the input end time, the three-dimensional movement to which the contact movement signal is input from the character separation switch 6. The contact movement that constitutes the handwritten character “ni” with the trajectory (I, C, H) as the contact movement trajectory and the three-dimensional movement trajectory (B, D, F) without the contact movement signal input as the non-contact movement trajectory. Extract the trajectory.

マイコン５は、抽出した手書き文字「に」を構成する接触移動軌跡（イ、ハ、ホ）の手書き文字情報を無線通信回路６から文字認識装置へ送信し、文字認識装置は、接触移動軌跡（イ、ハ、ホ）の特徴から描かれた文字を「に」と認識する。   The microcomputer 5 transmits the handwritten character information of the contact movement locus (i, ha, ho) constituting the extracted handwritten character “ni” from the wireless communication circuit 6 to the character recognition device. The character drawn from the characteristics of (i, ha, ho) is recognized as “ni”.

本実施の形態では、少なくともペン先を筆記平面１０へ接触させるｔ２、ｔ４の時点で、ペン先の移動速度を０として、ｔ２、ｔ４の時点での移動速度を時間ｔで積分して求める相対移動距離を補正できるので、三次元移動軌跡をより現実のペン先の移動軌跡に近似させることができる。   In this embodiment, at least at times t2 and t4 when the pen tip is brought into contact with the writing plane 10, the moving speed of the pen tip is set to 0, and the moving speed at time t2 and t4 is integrated by time t. Since the movement distance can be corrected, the three-dimensional movement locus can be approximated to the actual movement locus of the pen tip.

また、本実施の形態では、文字区切りスイッチ６が、入力終了時を表す入力終了信号と、接触移動時間中であることを示す接触移動信号を出力することとなるが、両者は、文字区切りスイッチ６が入力される直前に加速度センサー３ｚが検出した加速度αｚを時間ｔについて積分したＺ方向の速度が正であるか負であるかによって判別する。   In the present embodiment, the character separation switch 6 outputs an input end signal indicating the end of input and a contact movement signal indicating that the contact movement time is in progress. Judgment is made according to whether the speed in the Z direction obtained by integrating the acceleration αz detected by the acceleration sensor 3z immediately before 6 is integrated with respect to time t is positive or negative.

１文字の入力終了後の文字区切りスイッチ６の入力は、筆記平面からペン先を離す＋Ｚ方向の移動の後の入力操作であり、文字区切りスイッチ６から入力信号を受けた直前（ｔ５とｔ６の間の例えば、０．５秒前）に検出したＺ方向の加速度αｚを時間ｔで積分したＺ方向の速度は、筆記紙面１０の鉛直方向に対するペン型入力装置１の傾斜を無視すれば、筆記平面１０から離れる方向の速度であり、正の値となる。一方、文字入力中にペン先が筆記平面１０から一時的に離れ移動した後、筆記平面への文字入力を開始する際（ｔ２、ｔ４の時点）の文字区切りスイッチ６の入力は、筆記平面１０へペン先を接近させた後の入力操作であり、直前に三次元加速度センサーが検出した加速度αｚを時間ｔで積分したＺ方向の速度は、筆記平面１０に向かう方向の負の値となる。従って、マイコン５は、文字区切りスイッチ６が入力される直前に検出したＺ方向の加速度αｚを積分して得られるＺ方向の速度の符号が、正であれば入力終了信号と、負であれば接触移動信号と判別する。   The input of the character delimiter switch 6 after the input of one character is an input operation after moving the pen tip away from the writing plane in the + Z direction, immediately before receiving the input signal from the character delimiter switch 6 (at t5 and t6). The speed in the Z direction obtained by integrating the acceleration αz in the Z direction detected at a time t, for example, 0.5 seconds before) is written if the inclination of the pen-type input device 1 with respect to the vertical direction of the writing paper surface 10 is ignored. The speed in a direction away from the plane 10 is a positive value. On the other hand, after the pen tip is temporarily moved away from the writing plane 10 during character input, the character separator switch 6 is input when the character input to the writing plane is started (at time t2 and t4). The speed in the Z direction obtained by integrating the acceleration αz detected by the three-dimensional acceleration sensor immediately before with the time t is a negative value in the direction toward the writing plane 10. Accordingly, if the sign of the Z-direction speed αz obtained by integrating the Z-direction acceleration αz detected immediately before the character separator switch 6 is input is positive, the microcomputer 5 indicates an input end signal. The contact movement signal is determined.

尚、入力終了信号と接触移動信号の判別は、マイコン５が文字区切りスイッチ６から入力信号を入力した時の三次元移動軌跡のＺ方向の位置が、原点「０」の近傍である場合に接触移動信号と、筆記平面１０から離れたと推定される正の位置である場合に入力終了信号と判別してもよい。また、マイコン５が文字区切りスイッチ６から入力信号を入力した後の三次元移動軌跡が所定時間同一面に属する場合に接触移動信号と判別することもできる。   The input end signal and the contact movement signal are discriminated when the position in the Z direction of the three-dimensional movement locus when the microcomputer 5 inputs the input signal from the character separation switch 6 is in the vicinity of the origin “0”. If the movement signal is a positive position estimated to be away from the writing plane 10, it may be determined as an input end signal. Further, when the three-dimensional movement trajectory after the microcomputer 5 inputs the input signal from the character separation switch 6 belongs to the same plane for a predetermined time, it can be determined as the contact movement signal.

上述の第２実施の形態では、ペン型入力装置１を筆記紙面１０に対して傾斜させると、その軸方向となるＺ方向が必ずしも筆記紙面１０の鉛直方向と一致しないで、文字区切りスイッチ６が入力される直前のＺ方向の速度の符号若しくはＺ方向の位置から、入力終了信号と接触移動信号とを正確に判別できない場合がある。そこで、第３実施の形態では、１文字の入力終了後の文字区切りスイッチ６の入力は、筆記平面１０から最後にペン先を離すｔ５の後、図４に示すように、文字入力中の非接触移動時間△Ｔ（図４参照）より充分に長い終了操作時間Ｔが経過した後の入力終了時ｔ６に操作するものとする。   In the second embodiment described above, when the pen-type input device 1 is tilted with respect to the writing paper surface 10, the Z direction that is the axial direction does not necessarily coincide with the vertical direction of the writing paper surface 10, and the character separation switch 6 is There are cases where the input end signal and the contact movement signal cannot be accurately determined from the sign of the velocity in the Z direction immediately before being input or the position in the Z direction. Therefore, in the third embodiment, after the input of one character is completed, the character separation switch 6 is input after t5 when the pen tip is finally released from the writing plane 10, as shown in FIG. It is assumed that the operation is performed at the input end t6 after the end operation time T sufficiently longer than the contact movement time ΔT (see FIG. 4) has elapsed.

これにより、第２実施の形態で判別した入力終了信号であっても、終了操作時間Ｔが経過していない場合には入力終了信号と判別しないので、接触移動信号を入力終了信号と誤って判別することがなくなる。   Thus, even if the input end signal determined in the second embodiment is not determined as the input end signal when the end operation time T has not elapsed, the contact movement signal is erroneously determined as the input end signal. There is no longer to do.

図５は、三次元移動軌跡から、接触移動軌跡と非接触移動軌跡を確実に判別する第４の実施の形態に係るペン型入力装置２０を示す。このペン型入力装置２０は、ペン先にペン先と筆記平面１０との接触を検知する接触センサー２１が取り付けられている他は、第１実施の形態に係るペン型入力装置１と同一構成であるので、同一番号を付して共通する構成の説明は省略する。   FIG. 5 shows a pen-type input device 20 according to a fourth embodiment that reliably discriminates a contact movement locus and a non-contact movement locus from a three-dimensional movement locus. The pen-type input device 20 has the same configuration as the pen-type input device 1 according to the first embodiment, except that a contact sensor 21 that detects contact between the pen tip and the writing plane 10 is attached to the pen tip. Therefore, the same number is assigned and the description of the common configuration is omitted.

ペン型入力装置２０のペン先には、ペン型入力装置２０の相対移動を検出するボールやボールの回転を検出する機構が収容されず、配置スペースを占有しない圧電基板などからなる加速度センサー３のみを収容するので、補助的にペン先と筆記平面との接触を検知する接触センサー２１を配置することができる。   The pen tip of the pen-type input device 20 does not contain a ball for detecting the relative movement of the pen-type input device 20 or a mechanism for detecting the rotation of the ball, and only the acceleration sensor 3 made of a piezoelectric substrate or the like that does not occupy an arrangement space. Therefore, a contact sensor 21 that detects contact between the pen tip and the writing plane can be arranged in an auxiliary manner.

接触センサー２１の出力は、マイコン５に接続し、ペン先が筆記平面１０に接触している間、連続して接触信号を出力する。これにより、ペン型入力装置２０では、文字区切りスイッチ６によって手書き文字入力中に、接触移動信号を入力することなく、移動軌跡抽出部であるマイコン５は、接触センサー２１から接触信号が入力されている三次元移動軌跡を接触移動軌跡と、接触信号が入力されていない三次元移動軌跡を非接触移動軌跡として、確実に接触移動軌跡のみを抽出することができる。   The output of the contact sensor 21 is connected to the microcomputer 5 and continuously outputs a contact signal while the pen tip is in contact with the writing plane 10. Thereby, in the pen-type input device 20, the microcomputer 5 serving as the movement trajectory extraction unit receives the contact signal from the contact sensor 21 without inputting the contact movement signal while inputting the handwritten character by the character separation switch 6. Only the contact movement trajectory can be reliably extracted with the three-dimensional movement trajectory as a contact movement trajectory and the three-dimensional movement trajectory without a contact signal as a non-contact movement trajectory.

また、文字区切りスイッチ６からは、入力終了信号のみが入力されるので、第２、第３実施の形態のように、接触移動信号と判別する必要がなく、１文字の手書き文字の入力終了時を確実に軌跡抽出部へ伝達できる。   Further, since only the input end signal is input from the character separation switch 6, it is not necessary to discriminate it from the contact movement signal as in the second and third embodiments, and at the end of inputting one handwritten character. Can be reliably transmitted to the trajectory extraction unit.

尚、１文字を入力する際の接触移動軌跡で挟まれる非接触移動軌跡の長さは、１文字の文字入力終了後に次の文字の文字入力を行うためにペン先を非接触で移動させる非接触移動軌跡より一般に短いので、非接触移動軌跡が所定長さに設定するしきい値を超えた場合に、１文字の手書き文字の入力終了と判別することもできる。   Note that the length of the non-contact movement trajectory sandwiched between the contact movement trajectories when inputting one character is the non-contact movement of the pen tip in order to perform the character input of the next character after the input of one character is completed. Since it is generally shorter than the contact movement trajectory, it can also be determined that the input of one handwritten character has ended when the non-contact movement trajectory exceeds a threshold value set to a predetermined length.

また、１文字の手書き文字の入力終了後に、ペン型入力装置１を例えば２度上下に振るなど、通常の手書き文字入力操作と異なる操作を行い、この操作によるペン先の加速度変化から１文字の手書き文字の入力終了と判別することもできる。   Further, after the input of one handwritten character is completed, an operation different from the normal handwritten character input operation, such as shaking the pen-type input device 1 twice, is performed. It can also be determined that the input of handwritten characters has ended.

上述の各実施の形態では、抽出した接触移動軌跡を、無線通信回路６により無線信号で文字認識装置へ送信しているが、ペン型入力装置１、２０を文字認識装置にケーブルで接続し、ケーブルを介して出力してもよい。   In each of the embodiments described above, the extracted contact movement trajectory is transmitted to the character recognition device by a wireless signal by the wireless communication circuit 6, but the pen-type input devices 1 and 20 are connected to the character recognition device with a cable, You may output via a cable.

また、文字認識装置は、ペン型入力装置１、２０のペン型ケース２内に内蔵するものであってもよい。   The character recognition device may be incorporated in the pen-type case 2 of the pen-type input devices 1 and 20.

本発明は、手書き文字を認識する文字認識装置へ、手書きした文字の軌跡を出力するペン型入力装置に適している。   The present invention is suitable for a pen-type input device that outputs a locus of handwritten characters to a character recognition device that recognizes handwritten characters.

本発明の一実施の形態に係るペン型入力装置１の説明図である。It is explanatory drawing of the pen-type input device 1 which concerns on one embodiment of this invention. ペン型入力装置１を筆記平面１０に対して傾けて移動させる状態を示す説明図である。It is explanatory drawing which shows the state which inclines and moves the pen-type input device 1 with respect to the writing plane. 平仮名「に」を手書きするペン先の軌跡を示す平面図である。It is a top view which shows the locus | trajectory of the nib which handwrites hiragana "ni". 文字区切りスイッチ６とペン先の移動軌跡を比較するタイムチャートである。It is a time chart which compares the character separation switch 6 and the movement locus | trajectory of a pen point. 他の実施の形態に係るペン型入力装置２０の説明図である。 図である。It is explanatory drawing of the pen-type input device 20 which concerns on other embodiment. FIG. 従来のペン型入力装置１００の説明図である。It is explanatory drawing of the conventional pen-type input device.

符号の説明Explanation of symbols

１、２０ ペン型入力装置
３ 三次元加速度センサー
５ マイコン回路（軌跡検出部、移動軌跡抽出部）
６ 文字区切りスイッチ
１０ 筆記平面
２１ 接触センサー
ΔＴ 非接触移動時間
Ｔ 終了操作時間 1, 20 Pen-type input device 3 Three-dimensional acceleration sensor 5 Microcomputer circuit (trajectory detection unit, movement trajectory extraction unit)
6 Character separation switch 10 Writing plane 21 Contact sensor ΔT Non-contact movement time T End operation time

Claims (2)

ペン状ケースのペン先に収容され、ペン先の互いに直交するＸ、Ｙ、Ｚ方向の加速度（αｘ、αｙ、αｚ）を検出する三次元加速度センサと、
前記ペン状ケースに取り付けられ、筆記平面上に描く手書き文字毎の入力終了時を表す入力終了信号を入力する文字区切りスイッチと、
前記三次元加速度センサで検出する加速度（αｘ、αｙ、αｚ）と、筆記平面上の入力開始位置でペン先を停止させた入力開始時から該ペン先の加速度（αｘ、αｙ、αｚ）を検出するまでの経過時間ｔとから、経過時間ｔにおける入力開始位置からＸ、Ｙ、Ｚ方向の相対移動距離を入力開始時から入力終了時まで連続して求め、手書き文字毎のペン先の三次元移動軌跡を検出する軌跡検出部と、
前記三次元移動軌跡から、筆記平面をペン先が接触しながら移動する接触移動軌跡を抽出する移動軌跡抽出部とを備え、
手書き文字毎に、筆記平面上に描いた手書き文字の接触移動軌跡を、文字認識装置へ出力することを特徴とするペン型入力装置。 A three-dimensional acceleration sensor that is housed in the pen tip of the pen-like case and detects accelerations (αx, αy, αz) in the X, Y, and Z directions orthogonal to each other;
A character delimiter switch that is attached to the pen-like case and that inputs an input end signal that represents the end of input for each handwritten character drawn on the writing plane;
The acceleration (αx, αy, αz) detected by the three-dimensional acceleration sensor and the acceleration (αx, αy, αz) of the pen tip are detected from the start of input when the pen tip is stopped at the input start position on the writing plane. The relative movement distance in the X, Y, and Z directions from the input start position at the elapsed time t is continuously obtained from the input start time to the input end from the input start position at the elapsed time t. A trajectory detection unit for detecting a movement trajectory;
From the three-dimensional movement locus, a movement locus extraction unit that extracts a contact movement locus that moves while the pen tip is in contact with the writing plane, and
A pen-type input device that outputs, for each handwritten character, a contact movement trajectory of a handwritten character drawn on a writing plane to a character recognition device. ペン状ケースの先端に、筆記平面にペン先が接触した際に接触信号を出力する接触センサーが取り付けられ、
移動軌跡抽出部は、接触センサーから前記接触信号が入力されている間の三次元移動軌跡を接触移動軌跡として抽出することを特徴とする請求項１に記載のペン型入力装置。 A contact sensor that outputs a contact signal when the pen tip touches the writing plane is attached to the tip of the pen-shaped case.
The pen-type input device according to claim 1, wherein the movement trajectory extraction unit extracts a three-dimensional movement trajectory while the contact signal is input from the contact sensor as a contact movement trajectory.
JP2007271472A 2007-10-18 2007-10-18 Pen type input device Pending JP2009099041A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8538156B2 (en) 2010-07-26 2013-09-17 Casio Computer Co., Ltd. Character recognition device and recording medium
KR101311506B1 (en) 2013-02-27 2013-09-25 (주)판도라테크 Pen input apparatus and operation method thereof
CN111538417A (en) * 2020-04-17 2020-08-14 京东方科技集团股份有限公司 Control method for character input, touch pen, display device, system and medium
KR20210059222A (en) * 2019-11-15 2021-05-25 한국생산기술연구원 3d pen for real-time acquisition of 3d cad data and its 3d cad data acquisition method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8538156B2 (en) 2010-07-26 2013-09-17 Casio Computer Co., Ltd. Character recognition device and recording medium
US8571321B2 (en) 2010-07-26 2013-10-29 Casio Computer Co., Ltd. Character recognition device and recording medium
KR101311506B1 (en) 2013-02-27 2013-09-25 (주)판도라테크 Pen input apparatus and operation method thereof
KR20210059222A (en) * 2019-11-15 2021-05-25 한국생산기술연구원 3d pen for real-time acquisition of 3d cad data and its 3d cad data acquisition method
KR102291671B1 (en) * 2019-11-15 2021-08-23 한국생산기술연구원 3d pen for real-time acquisition of 3d cad data and its 3d cad data acquisition method
CN111538417A (en) * 2020-04-17 2020-08-14 京东方科技集团股份有限公司 Control method for character input, touch pen, display device, system and medium

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