JP5800046B2 - Character input device - Google Patents

Description

  The present invention relates to a character input device such as an information processing device for inputting characters from a keyboard displayed on a display screen through operation of a touch panel.

  In a character input device provided in an information processing device or the like, a character input method by inputting Roman characters has been widely used. For example, Patent Document 1 shown below includes a touch panel in a display device and a built-in software keyboard function, and when inputting characters by inputting Roman characters, it is effective on the keyboard based on the next character to be input as Roman characters. There has been proposed a character input device capable of preventing the input of invalid characters as Roman characters by determining keys and invalid keys and highlighting valid keys on the display device according to the determination result. ing.

JP-A-5-88804

  The above-described character input device of Patent Document 1 is convenient in that it is possible to prevent the input of invalid characters as Roman characters, but a software keyboard that uses a touch panel and displays a virtual keyboard on a display screen. Unlike an actual keyboard, since the surface is flat, an incorrect input may be performed by inputting a position deviating from the key position to be input.

  The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a character input device that can prevent or suppress erroneous input.

  The character input device according to the invention of claim 1 is provided on a display screen for displaying a keyboard having keys arranged in a predetermined layout, and acquires a coordinate data of a pressed position when an arbitrary position is pressed. A word dictionary that preliminarily stores word information, an adjacent key storage unit that preliminarily stores key information adjacent to each key of the keyboard, and a control unit, the control unit including the touch panel The coordinate / key corresponding means for associating the coordinate data acquired by the key with each key of the keyboard, and the key pressed by the coordinate / key corresponding means every time the coordinate data is acquired by the pressing operation of the touch panel. Identifying and referring to the information stored in the word dictionary, setting information on the first character that is the next key candidate to be input, and By referring to the information stored in the key storage means, the character data setting means for setting the information of the second character that is the key adjacent to the key of the first character, and the coordinate data by the pressing operation of the touch panel. Each time it is acquired, the key pressed by the coordinate / key correspondence means is specified, and the pressed key is the first character and / or the second character set by the character information setting means. A determination means for determining whether or not there is a key, and a determination that the key pressed by the determination means does not correspond to the first character and corresponds to the key of the second character; The key that is located at the shortest distance from the position of the coordinate data acquired by the pressing operation of the touch panel among the keys of the first character that is set to be adjacent to the key of the second character that has been set There characterized in that it comprises a control means deemed to have been pressed instead of the second character key.

  According to a second aspect of the present invention, in the character input device according to the first aspect, the key candidates for the first character set by the character information setting means include a control key such as an execution key in addition to an alphanumeric symbol character key. It is characterized by that.

  According to a third aspect of the present invention, in the character input device according to the first or second aspect, when it is determined that the key pressed by the determining means does not correspond to either the first character key or the second character key. Includes a second control unit that invalidates the coordinate data acquired by the pressing operation of the touch panel.

  According to a fourth aspect of the present invention, in the character input device according to any one of the first to third aspects, the control unit further includes key center position coordinate storage means for previously storing the center position coordinates of the key tops of the keys of the keyboard. The key located at the shortest distance in the control means is determined with reference to the center position coordinates of the key top stored in the key center position coordinate storage means.

  According to the present invention, it is determined that the input is the character key of the second character in which the character key is arranged on the keyboard adjacent to the character key of the first character that is the next alphabetic character to be input. The coordinate data input from the touch panel is converted into character data corresponding to the character key of the first character located at the shortest distance from the pressed position on the keyboard indicated by the coordinate data. Therefore, even if the key input on the virtual keyboard displayed on the display screen by the software keyboard function is pressed slightly away from the key position to be originally input, the key input intended by the user is not performed. It becomes possible to prevent or suppress erroneous input of characters.

It is a front view of an information processor concerning one embodiment of the present invention. It is a block diagram which shows the circuit structure of the information processing apparatus shown in FIG. It is explanatory drawing of the adjacent character key table memorize | stored in ROM of the information processing apparatus shown in FIG. It is explanatory drawing of the Roman character kanji dictionary provided in the information processing apparatus shown in FIG. It is a flowchart of the character input process of the information processing apparatus shown in FIG. It is explanatory drawing of the character input process of the information processing apparatus shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings by applying an information processing apparatus 1 including a character input device. FIG. 1 is a front view of an information processing apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 1, the information processing apparatus 1 includes a display unit 3 that includes a liquid crystal display device and displays a virtual keyboard 4 by a software keyboard function on the upper surface of the apparatus body 2. The display unit 3 is provided with a touch panel 8 that is a transparent pressure switch as a character input device on the upper surface of the display screen of the liquid crystal display device.

  The display screen of the display unit 3 includes character / symbol input keys (hereinafter collectively referred to as character keys) such as alphabetic character keys, numeric keys, and symbol keys, conversion keys to Kanji characters, non-conversion keys, and execution. A keyboard area 3a for displaying a virtual keyboard 4 having control keys such as keys and a character editing area 3b for displaying characters input from the keyboard area 3a are provided. The keyboard area 3a displays each key of the keyboard 4 as an image, and by pressing the position of each key of the keyboard 4 displayed on the display screen of the touch panel 8, the coordinate position data of each key is displayed. The display unit 3 and the touch panel 8 constitute a software keyboard.

  FIG. 2 is a block diagram illustrating a circuit configuration of the information processing apparatus 1. As shown in FIG. 2, the information processing apparatus 1 includes a display drive unit 6 that controls image display in the display unit 3 described above, a display memory 7 that stores display data to be displayed on the display screen of the display unit 3, and the above-described display unit 3. A / D converter 9 that converts the coordinate data of the analog electrical signal output from the touch panel 8 to digital signal coordinate data, and the conversion means that converts the coordinate data output from the A / D converter 9 to character data In addition to performing input processing, a CPU (control unit) 10 that controls the entire apparatus, a ROM 11 that stores programs and various data for performing character input processing, etc., and kanji information corresponding to romaji reading The romaji kanji dictionary 12 that stores the characters and the characters and symbols that are displayed on the display screen of the display unit 3 are stored as dots and the characters corresponding to the fonts stored at the time of display are stored. And CG (character generator) 13 for outputting in preparative information, and RAM14 with a working area for the buffer and the process of temporarily storing the data in the character input process and the like, and a.

  The ROM 11 includes a program storage area 11a for storing programs such as a program for performing character input processing in the character input device, a keyboard image storage area 11b for storing image data of the keyboard 4 displayed on the display unit 3, and a touch panel 8. Coordinate / character conversion table storage area 11c for storing coordinate / character conversion table for converting input coordinate data into predetermined character data, and Roman character / kana character correspondence table for converting input characters into Kana characters Romaji-kana character correspondence table storage area 11d, an adjacent character key table storage means for storing an adjacent character key table in which information of character keys arranged adjacent to each character key of the alphabet characters on the keyboard 4 is registered It is displayed on a display screen of a certain adjacent character key table storage area 11e and the display unit 3. A key center position coordinate table storage area 11f for storing a key center position coordinate table for storing the coordinate data of the center position of each key of the keyboard 4.

  The program for performing the character input process stored in the program storage area 11a is a feature of the present invention by operating the control unit 10 in the information processing apparatus 1 having the software keyboard function including the touch panel 8. This enables character input processing for preventing erroneous input or suppressing erroneous input.

  The image data of the keyboard 4 stored in the keyboard image storage area 11b is obtained by arranging necessary keys including alphabetic character keys in a predetermined layout, as shown in FIG. It is displayed in the keyboard area 3a portion of the screen.

  The coordinate / character conversion table stored in the coordinate / character conversion table storage area 11c converts the coordinate data input from the touch panel 8 into character data corresponding to the character key of the keyboard 4 located at the coordinate position. The coordinate data from the touch panel 8 and the keyboard 4 displayed on the display screen are associated with each other.

  The Romaji-kana character correspondence table storage area 11d stores the Romaji-kana character correspondence table for associating kana characters with information on Romaji reading. From the keyboard 4 displayed in the keyboard area 3a of the display unit 3, When alphabetic characters are sequentially input, the Roman characters are converted into Kana characters by referring to this Roman character-Kana character conversion table. The converted kana characters are displayed in the character editing area 3b of the display unit 3.

  The adjacent character key table stored in the adjacent character key table storage area 11e is for comparing the character key of each alphabetic character on the keyboard 4 with the character key whose key position is adjacent to each character key. As shown in FIG. 3, the adjacent character key table corresponds to the character keys of the alphabet characters “A” to “Z” arranged on the keyboard 4 and is adjacent to the character keys of the alphabet characters. 4 Information on keys arranged on top is stored in advance. For example, as shown in FIGS. 3 and 1, the character keys adjacent to the character key of the alphabet letter “A” are the character keys “S”, “Q”, “W”, and “Z”. .

  The key center position coordinate table storage area 11f stores a key center position coordinate table. The key center position coordinate table is coordinate data indicating the center position of each key of the keyboard 4 displayed in a predetermined layout in the keyboard area 3a with the predetermined position of the keyboard area 3a displayed on the display screen of the display unit 3 as reference coordinates. Consists of.

  As shown in FIG. 4, the Romaji-Kanji dictionary 12 stores in advance information such as Romaji reading, Kanji corresponding to Romaji reading, idioms thereof, Romaji, and Kana character correspondence.

  The RAM 14 includes an input character buffer 14a in which information on input characters is sequentially stored, a text memory 14b in which character information whose input is confirmed is stored, and a press position buffer 14c in which coordinate data of the press position of the touch panel 8 is stored. A work area is secured. Further, after at least one alphabet character is input from the keyboard 4, character information setting means for setting information of an alphabet character to be input next (hereinafter also referred to as input candidate character or first character). The first character setting buffer 14d is secured. In the Roman character input related to the character input method in the information processing apparatus 1, by referring to the Roman character reading information stored in the Roman character kanji dictionary 12, the prediction of the alphabet character to be input next in the alphabet character input process is performed. However, as will be described later, information of input candidate characters to be input next is set in the first character setting buffer 14d.

  The RAM 14 is adjacent to the character key associated with the first character set in the first character setting buffer 14d on the keyboard 4 together with the setting of the first character in the first character setting buffer 14d. A second character setting buffer 14e, which is character information setting means for setting information of the second character as the character of the character key to be set, is secured. Further, the RAM 14 has a work area necessary for temporarily storing other information.

  Then, the control unit 10 determines whether the pressed position on the touch panel 8 corresponds to the character key position of the second character set by the character information setting unit based on the coordinate data input from the touch panel 8. It functions as a judgment means. In addition, when it is determined that the pressing position on the touch panel 8 corresponds to the character key position of the second character as the determination unit, the control unit 10 displays the coordinate data input from the touch panel 8 as a keyboard indicated by the coordinate data. 4 also functions as a control means for converting into character data corresponding to the character key of the first character located at the shortest distance from the pressed position on the top.

  Furthermore, the control unit 10 also determines that a key other than the first character key and the second character key has been input based on the coordinate data input from the touch panel 8 as a determination unit. And the control part 10 functions also as a 2nd control means which invalidates the input corresponding to pressing operation on the touch panel 8 based on the judgment.

  Regarding the information processing apparatus 1 configured as described above, a character input process of the character input apparatus will be described. FIG. 5 is a flowchart showing the flow of character input processing. Hereinafter, a character input process performed by the control unit 10 will be described with reference to FIG.

  First, when the information processing apparatus 1 is turned on, the control unit 10 initializes the RAM 14, and an input character buffer 14a, a text memory 14b, a pressed position buffer 14c, and a first character setting buffer provided in the RAM 14. Initial processing for clearing the contents of each buffer of 14d and second character setting buffer 14e is performed. Further, the control unit 10 reads out the image data of the keyboard 4 stored in the keyboard image storage area 11b of the ROM 11, and displays the virtual keyboard 4 in the keyboard area 3a of the display screen of the display unit 3 (step S100). .

  Next, based on the output of the A / D converter 9, the control unit 10 determines whether there is a key input by a pressing operation on the touch panel 8 (step S110). When determining that there is a key input while waiting until the key input is received, the control unit 10 takes in the coordinate data output from the A / D converter 9 and stores it in the pressing position buffer 14c of the RAM 14 (step S120). It is determined whether or not the acquired coordinate data is a character key of alphabet characters (step S130).

  When the control unit 10 determines that the acquired coordinate data is a character key of alphabet characters (YES in step S130), the control unit 10 determines whether character information is already stored in the input character buffer 14a of the RAM 14 ( Step S140). If it is the first input of the first character, the RAM 14 is initialized by the process of step S100, and character information is not stored in the input character buffer 14a, and the process proceeds to the process of step S150.

  Then, the control unit 10 refers to the coordinate / character conversion table stored in the coordinate / character conversion table storage area 11c of the ROM 11 and converts the coordinate data stored in the pressing position buffer 14c into character data in step S120. Conversion is performed (step S150). Further, the control unit 10 stores the converted character data in the input character buffer 14a of the RAM 14 (step S160), and controls the display drive unit 6 to control the input character in the character editing area 3b of the display unit 3. It is displayed (step S170).

  Next, the control unit 10 uses the head matching method based on the character information stored in the input character buffer 14a of the RAM 14, and the idiom corresponding to the Romaji reading stored in the Romaji-Kanji dictionary 12 shown in FIG. The input candidate character (first character) to be input next to the alphabet character stored in the input character buffer 14a of the RAM 14 is searched (step S180). An alphabet character is extracted, and information on the extracted first character (usually a plurality of characters) to be the next input candidate character is set in the first character setting buffer 14d of the RAM 14 (step S190). Further, the control unit 10 shows the keys in which the alphabetical character keys set in the first character setting buffer 14d as the first character in step S190 and the key arrangement on the keyboard 4 are adjacent to each other are shown in FIG. The adjacent character key table stored in the adjacent character key table storage area 11e of the ROM 11 is extracted with reference to the second character setting buffer 14e of the RAM 14 as the second character. Step S200) returns to Step S110 and waits until the next key input.

  The control unit 10 finishes character input by the first key input, and in the second and subsequent key inputs, through the processing of step S120 and step S130, in the process, the coordinate data of the latest pressed position on the touch panel 8 is obtained. The data is taken in and stored in the pressing position buffer 14c of the RAM 14. That is, when coordinate data is already stored, the control unit 10 overwrites the previous coordinate data and stores new coordinate data.

  When the control unit 10 determines that the captured coordinate data is an alphabetic character key (YES in step S130), whether or not the character information already keyed in the input character buffer 14a of the RAM 14 is stored. Is determined (step S140). The control unit 10 determines that the character information previously stored is stored in the input character buffer 14a of the RAM 14 because the previously input character information is already stored in the input character buffer 14a for the second and subsequent key inputs. (YES in step S140), the process proceeds to the next step S210.

  In step S210, the control unit 10 refers to the coordinate / character conversion table stored in the ROM 11 and loads it in step S120, thereby representing the key position of the keyboard 4 represented by the coordinate data stored in the pressing position buffer 14c of the RAM 14. It is determined whether or not the first character is the first character set in the first character setting buffer 14d including the key indicating the character to be input.

  The control unit 10 determines that the character at the key position of the keyboard 4 represented by the coordinate data stored in the pressed position buffer 14c is the first character set in the first character setting buffer 14d of the RAM 13 ( With reference to the coordinate / character conversion table stored in the ROM 11, the coordinate data stored in the pressing position buffer 14c of the RAM 14 is converted into the corresponding character data (step S220). The character data thus stored is stored in the input character buffer 14a of the RAM 14 (step S230), and the input character is displayed in the character editing area 3b of the display unit 3 (step S240).

  Next, the control unit 10 uses the head matching method based on the character information stored in the input character buffer 14a of the RAM 14, and the idioms, romaji, and kana characters corresponding to the romaji reading stored in the romaji kanji dictionary 12. A search for information such as correspondence is performed (step S250), the first character to be input next to the alphabetic character stored in the input character buffer 14a of the RAM 14 is extracted, and the extracted first character is extracted. The information is stored in the first character setting buffer 14d of the RAM 14, and the setting of the first character is updated (step S260). Further, the control unit 10 refers to the adjacent character key table stored in the ROM 11 for the first character key whose setting has been updated in step S260 and the second character whose key arrangement on the keyboard 4 is adjacent. The extracted character information is stored in the second character setting buffer 14e of the RAM 14, and the setting of the second character is updated (step S270). Then, it returns to step S110 and waits for the next key input.

  Further, the controller 10 determines that the character at the key position of the keyboard 4 represented by the coordinate data stored in the pressing position buffer 14c of the RAM 14 is not the first character set in the first character setting buffer 14d of the RAM 14. (NO in step S210), the control unit 10 next sets the second character setting buffer 14e in the RAM 14 in which the character at the key position of the keyboard 4 represented by the coordinate data is set. It is determined whether or not the character is a character (step S280).

  Here, the controller 10 determines that the character at the key position of the keyboard 4 represented by the coordinate data stored in the pressing position buffer 14c of the RAM 14 is the second character set in the second character setting buffer 14e of the RAM 14. If it is determined that there is (YES in step S280), the control unit 10 designates the key related to the first character adjacent to the key of the keyboard 4 related to the second character indicated by the coordinate data as the ROM 11 shown in FIG. Is selected based on the information stored in the adjacent character key table and the information stored in the first character setting buffer 14d of the RAM 14 (step S290).

  That is, the control unit 10 determines that the coordinate position on the keyboard 4 indicated by the coordinate data stored in the pressing position buffer 14c of the RAM 14 is the character key position of the second character stored in the second character setting buffer 14e of the RAM 14. In order to select a character key relating to the first character arranged on the keyboard 4 adjacent to the character key, the adjacent character key table stored in the ROM 11 and the first character setting of the RAM 14 are selected. Selection is made based on information stored in the buffer 14d.

  When the control unit 10 selects the character key of the first character adjacent to the character key of the second character in this case in step S290, the control unit 10 then coordinates by the coordinate data stored in the pressing position buffer 14c of the RAM 14. Calculation of the distance between the pressed position on the touch panel 8 indicating the position (in this case, a certain position on the character key of the second character) and the character keys related to the plurality of first characters selected in step S290 (Step S300).

  In calculating the distance in step S300, the control unit 10 sets the position of the character key based on the coordinates of the center position of the key top of the character key of the plurality of first characters. Then, the control unit 10 refers to the character key positions of a plurality of first characters from the key center position coordinate table stored in the key center position coordinate table storage area 11f of the ROM 11. The control unit 10 compares the calculation result of step S300, and determines the character key that is the shortest distance from the pressed position on the touch panel 8 and the character keys of the plurality of first characters as input candidate characters (step S310). The control unit 10 converts the character data of the character key related to the second character key-inputted into character data of the first character at the determined shortest distance (step S320).

  Here, a calculation process of distances from the character keys related to the plurality of first characters adjacent to the character key related to the second character will be described with reference to the drawings. FIG. 6 is an explanatory diagram of the calculation processing of distances from the character keys related to a plurality of first characters adjacent to the character key related to the pressed second character shown in step S300. The relationship between the pressed position of the touch panel 8 and the three letter keys “A”, “E”, and “S” of the alphabet letters is shown. The letter keys “A” and “E” are the first letters. , “S” is the second character. P is a pressing position, OA represents the center position of the character key “A”, OE represents the center position of the character key “E”, and the distance between the point P and the point OA is a, and between the point P and the point OE. The distance is b, and b is shorter than a. In this case, the first character to be input next is “A” or “E”, and when the second character “S” is key-input, the pressed position P is the character key “E”. Since the distance between the two is shorter, the input to the character key “S” is processed as the input of the character key “E”.

  After the process of step S320, the process proceeds to the process (step 230) similar to the above-described first character key input, and then returns to step S110 through steps S240 to S270 and waits for the next key input.

  In step S280, the control unit 10 determines that the character at the key position of the keyboard 4 represented by the coordinate data stored in the pressed position buffer 14c of the RAM 14 is set in the second character setting buffer 14e of the RAM 14. When it is determined that the character is not the character (NO in step S280), the control unit 10 displays an error message indicating that the input is invalid as the second control means on the display unit 3 (step S330), and step S110. Return to and wait for the next key input.

  In addition, when determining in step S130 that the input is not an alphabet character key (NO in step S130), the control unit 10 determines whether or not it is an input of a conversion key to kanji (step S340). When the control unit 10 determines that the conversion key has been input (YES in step S340), the control unit 10 refers to the dictionary information stored in the Romaji-kanji dictionary 12 shown in FIG. 4 and stores it in the input character buffer 14a of the RAM 14. The roman character reading character string is converted into the corresponding kanji character, and the kanji character whose conversion is confirmed is stored in the text memory 14b of the RAM 14 and displayed on the display unit 3 (step S350), and then the process returns to step S110 to return to the next key. Wait for input.

  Furthermore, the control unit 10 does not determine that the alphabet character key is input in the determination process in step S130 (NO in step S130), and further does not determine that the conversion key is input in the determination process in step S340 (in step S340). NO), it is determined whether or not a non-conversion key is input (step S360). If the control unit 10 determines that the non-conversion key has been input (YES in step S360), the control unit 10 converts the Roman character reading character string stored in the input character buffer 14a of the RAM 14 into a character string of kana characters and confirms it. When the character is stored in the text memory 14b of the RAM 14 and displayed on the display unit 3 (step S370), the process returns to step S110 and waits until the next key input. If the control unit 10 determines in step S360 that the non-conversion key is not input (NO in step S360), the control unit 10 invalidates the key input and immediately returns to step S110.

  According to the character input device of the information processing apparatus 1 of the present embodiment, in a character input device that sequentially inputs alphabetic characters by Roman input, adjacent to the character key of the first character that is the next alphabetic character to be input. When the input of the character key of the second character in which the character key is arranged on the keyboard 4 is determined, the coordinate data input from the touch panel 8 is most determined from the pressed position on the keyboard 4 indicated by the coordinate data. Since the character data corresponding to the character key of the first character located at a short distance is converted, the key input on the virtual keyboard 4 displayed on the display screen by the software keyboard function is originally input. Even if the key position is slightly deviated from the key position, it is possible to input the key intended by the user, and It is possible to prevent a force, or to suppress it.

  Further, the present invention is not limited to the above embodiment, and can be freely changed and improved without departing from the gist of the invention. Hereinafter, the invention described in the scope of claims of the present application will be appended.

[Appendix 1]
A touch panel that is provided on a display screen that displays a keyboard in which keys are arranged in a predetermined layout, and acquires coordinate data of the pressed position when an arbitrary position is pressed;
A word dictionary for storing word information in advance;
Adjacent key storage means for storing in advance information on keys adjacent to the respective keys of the keyboard;
A control unit,
The controller is
Coordinate / key correspondence means for associating the coordinate data acquired by the touch panel with each key of the keyboard;
Each time coordinate data is acquired by a pressing operation on the touch panel, a key pressed by the coordinate / key correspondence unit is specified, and the next key candidate input by referring to the information stored in the word dictionary The first character information is set, and the second character information that is the key adjacent to the first character key is set with reference to the information stored in the adjacent key storage means. Character information setting means;
Each time coordinate data is acquired by pressing the touch panel, a key pressed by the coordinate / key correspondence unit is specified, and the pressed character is set by the character information setting unit. And / or determination means for determining whether the character is the second character;
When it is determined that the key pressed by the determination means does not correspond to the first character and corresponds to the key of the second character, the key of the second character determined to be applicable is adjacent. Then, the key located in the shortest distance from the position of the coordinate data acquired by the pressing operation of the touch panel among the set of the keys of the first character is pressed instead of the key of the second character. Control means to be regarded as having been
A character input device characterized by that.

[Appendix 2]
The character input device according to appendix 1, wherein the first character key candidates set by the character information setting means include a control key such as an execution key in addition to an alphanumeric character key.

[Appendix 3]
When it is determined that the key pressed by the determination means does not correspond to either the first character key or the second character key, the coordinate data acquired by the pressing operation of the touch panel is invalidated. The character input device according to appendix 1 or 2, further comprising: a second control unit configured to perform the control.

[Appendix 4]
The control unit further includes key center position coordinate storage means for preliminarily storing a key top center position coordinate of each key of the keyboard, and the key top center position stored in the key center position coordinate storage means The character input device according to any one of appendices 1 to 3, wherein a key located at the shortest distance in the control means is determined with reference to coordinates.

1 Information processing device 2 Device body
3 Display section
3a Keyboard area 3b Character editing area
4 Keyboard 6 Display driver
7 Display memory
8 Touch panel 9 A / D converter
10 CPU (control unit) 11 ROM
11a Program storage area 11b Keyboard image storage area
11c Coordinate / character conversion table storage area
11d Romaji-kana character correspondence table storage area
11e Adjacent character key table storage area 11f Key center position coordinate table storage area
12 Romaji Kanji Dictionary 13 CG
14 RAM 14a Input character buffer
14b Text memory 14c Press position buffer
14d First character setting buffer 14e Second character setting buffer

Claims (4)

A touch panel that is provided on a display screen that displays a keyboard in which keys are arranged in a predetermined layout, and acquires coordinate data of the pressed position when an arbitrary position is pressed;
A word dictionary for storing word information in advance;
Adjacent key storage means for storing in advance information on keys adjacent to the respective keys of the keyboard;
A control unit,
The controller is
Coordinate / key correspondence means for associating the coordinate data acquired by the touch panel with each key of the keyboard;
Each time coordinate data is acquired by a pressing operation on the touch panel, a key pressed by the coordinate / key correspondence unit is specified, and the next key candidate input by referring to the information stored in the word dictionary The first character information is set, and the second character information that is the key adjacent to the first character key is set with reference to the information stored in the adjacent key storage means. Character information setting means;
Each time coordinate data is acquired by pressing the touch panel, a key pressed by the coordinate / key correspondence unit is specified, and the pressed character is set by the character information setting unit. And / or determination means for determining whether the character is the second character;
When it is determined that the key pressed by the determination means does not correspond to the first character and corresponds to the key of the second character, the key of the second character determined to be applicable is adjacent. Then, the key located in the shortest distance from the position of the coordinate data acquired by the pressing operation of the touch panel among the set of the keys of the first character is pressed instead of the key of the second character. Control means to be regarded as having been
A character input device characterized by that.   2. The character input device according to claim 1, wherein the first character key candidate set by the character information setting unit includes a control key such as an execution key in addition to an alphanumeric symbol character key. .   When it is determined that the key pressed by the determination means does not correspond to either the first character key or the second character key, the coordinate data acquired by the pressing operation of the touch panel is invalidated. The character input device according to claim 1, further comprising a second control unit configured to perform the control.   The control unit further includes key center position coordinate storage means for preliminarily storing a key top center position coordinate of each key of the keyboard, and the key top center position stored in the key center position coordinate storage means 4. The character input device according to claim 1, wherein a key located at a shortest distance in the control unit is determined with reference to coordinates. 5.

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