JP2001117709A - Keyboard system for one-hand input - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input system prepared for portable information equipment and enabling a user to easily and quickly input data by his (or her) hand as a keyboard having a large display screen and allowed to be attached to a mouse, as to compact information equipment having a character input function. SOLUTION: Five character input keys are arranged on the side face of a casing, a surface space is secured for a display screen and a mouse position ball, characters are allocated to the combinations of ON/OFF states of five keys at optimum while considering the operation capacity of the five fingers and the using frequency of characters. Thus the one-hand input keyboard signal capable of easily and quickly inputting a document or the like can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an input system used for small information equipment and communication equipment provided with a computer system having a document input function.

[0002]

2. Description of the Related Art Conventionally, document input to electronic information devices has been performed using a keyboard having a key arrangement of a typewriter. However, with the spread of small personal computers and portable information devices, documents have become smaller and lighter. And the keyboard itself has been reduced in area and volume. For example, in a pocket-type personal computer, a keyboard has been downsized as if it were proportional to the external size. Also, various methods based on numeric keys have been devised. A major feature is that one-handed input is possible while reducing the number of keys. For example, in the example of the portable telephone having the character mail function shown in FIG. 5, keys used for character input are arranged in an input key area (31). FIG. 6 shows an example of the input key area (31). 4x3 input key (3
6) are arranged in a matrix. Numbers are individually keyed, but a plurality of alphabetic characters are arranged on one key. According to the invention of U.S. Pat. No. 4,658,417, the same key is pressed several times to obtain a desired alphabet character. In contrast, US Pat.
No. 8 proposes selecting a character by pressing an adjacent pair key combination, and states that a character can be obtained by one input. Also, make the display screen a contact sensor type screen,
There are electronic notebooks and mobile phones that have a function for handwriting input. As a method, there are a method of selecting and inputting characters on the screen with an input pen, a method of processing character information input by handwriting as it is as a drawing screen, and a method of performing character identification by computer from handwriting input. In each case, a dedicated input pen is used. On the other hand, a proposal for further reducing the number of input keys has been disclosed. U.S. Pat. No. 4,360,892 proposes that a total of six keys, two for the thumb and one for the other finger, are arranged on the surface of the housing, and a combination of five keys is used for alphabet input. are doing. Characters are likened symbolically at key positions, and are devised to make it easier to remember combinations visually. U.S. Pat. No. 5,281,966 proposes that five keys are arranged so as to match the position of a finger as shown in FIG. 7, and that five alphabet characters are input by a combination of keys. Vowels in the alphabet are assigned alphabetically from the thumb to the little finger, and a key combination in which the consonants follow each vowel in alphabetical order has been attempted, and is devised so that it is easy to remember. Japanese Patent Application Laid-Open No. 6-274257 also proposes a keyboard composed of five keys. For a key corresponding to the thumb, three shift positions are provided in addition to the home position, and alphabet input is performed in combination with the other four fingers. Suggest to do. In both Japanese Patent Application Laid-Open No. Hei 9-114568 and U.S. Pat. No. 4,791,408 shown in FIG. 8, a plurality of character input keys are provided on a wide surface of the housing and one character input key is provided on the opposite surface, and the housing is sandwiched from above and below. We are devising so that we can input while holding the body. The latter has overwhelmingly less keys than the former, having five keys. One input key has a two-way input pad (42), and there are two types of input states depending on how the key is pressed from the neutral position. Is obtained.

[0003]

As information devices and portable communication devices have become smaller and lighter and display screens have been enlarged, it has become important to reduce the area of a keyboard for inputting characters. The area of the key for input and the interval between the keys have already been reduced to the limit of operability. Various numeric key-based inputs have been devised, but the number of keys reduced by this system is limited to 12 matrix-based keys of 4 rows and 3 columns. On the other hand, in the method of selecting an input key or a character on a screen with a finger or an input pen, a key or a character arranged in a matrix is visually identified, and then a place is specified.
The process of having to visually follow a finger or input pen to that location slows the input speed. Of course, blind touch input is not possible. Further, in a system in which a display screen is a touch sensor type screen and a handwriting input is possible, a large amount of data memory is required for processing as a drawing screen, and there is a problem that an amount of information is extremely small with respect to a memory capacity. . In addition, in a system having a function of converting characters from handwriting input by automatic image reading processing, in addition to handwriting time,
Since the input speed is limited by the computer reading process,
At the current technology level, there is a problem that the input speed is never high. In addition, there is a problem that reading errors or reading errors occur due to individual typefaces, custom characters, or premature entry, resulting in frequent re-input. further,
When a special input pen is required for inputting, waste of storage space for the pen and incidental work of taking out and storing the pen are involved. On the other hand, if the number of character input keys is 5-6
Individual proposals still have the following problems. In U.S. Pat. No. 4,360,892, 6
Keys are required, and US Pat.
Like the symbols, the key state combinations are arranged based on the alphabet shape and letter order, so the use frequency of the alphabet letters and the ability to move individual fingers are sacrificed, leaving problems in input speed. ing. Further, in both of the inventions, when there is no desk or the like, a hand for supporting the housing is required, so that the invention is not suitable for portable use and cannot be completely one-handed input. On the other hand, JP-A-6-274257 and U.S. Pat.
Although the number is also composed of five keys, both inventions are characterized in that a key for the thumb is provided with a plurality of shift positions. In actual operation, this is equivalent to the presence of two or more keys at the thumb position, the operation load on the thumb is large, and the input speed is limited. Furthermore, since the input keys are provided on the wide surface side, when the display screen is mounted, the display screen is mounted at a position avoiding the key portion, and the size of the display screen depends on the position and size of the key. In any of the above cases, a new proposal is required for a small information device that requires a display screen to be mounted or a large screen because it is devised as an input-only device. Similarly, there has been no effective proposal for a keyboard attached to a mouse input device for operating the position of a pointer on a display screen. The usual keyboard and mouse input device are often used in combination, and the useful area on the desk has been reduced. Further, in the conventional ten-key based input system of a portable telephone, there is a problem that a key input during a call cannot be performed because an input key is provided on a side to be put on the ear. Further, an effective one-handed input system with a high input speed, which simultaneously considers the operability and reflectivity of a human finger and the frequency of use of letters and numbers, has not been devised yet. In view of these drawbacks, the present invention provides a keyboard system that enables easy and fast input speed, and can be attached to a small information device or communication device capable of a large screen or a mouse input device to perform one-handed input. It was invented to provide.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a small-sized information device or communication device, in which main input keys for inputting characters and the like are arranged not on a surface of a display screen but on a side surface thereof. The screen can be enlarged. Also,
In the mouse input device that operates the pointer position on the screen, the input key of the present invention is attached to the side that shares the side of the rotating ball surface and the ridge, so that it is not necessary to use the conventional keyboard together . In addition, the number of character input keys is limited to five, and operability and input speed have been improved to a level that allows one-handed character input and also enables blind touch input. Of the input keys arranged on the side, five keys from the first key to the fifth key are arranged at positions corresponding to each finger in the order of thumb, index finger, middle finger, ring finger, little finger, and Input type is given by the order combination of key on / off state. 31 combinations are possible with five on / off keys, and the present invention is characterized by constructing an appropriate basic combination capable of inputting at a high speed, especially in view of operability and use frequency. A specific combination of five key states was assigned to a function of switching between an alphabet input mode and a numeric input mode, and in each mode, a combination of five key states was assigned an alphabet and a number. Regarding the assignment of key state combinations, the use frequency and the input speed were given the highest priority, and in addition, consideration was given to a combination that was easy to remember. That is, a combination of keys having a high input speed is assigned to frequently used alphabet letters and numbers in consideration of the operation ability of five fingers, thereby optimizing the overall input speed. Further, the speed of character input can be set according to the ability of the operator. Uppercase and lowercase letters are simplified so that they can be converted by pressing them longer than normal input, and the time setting can be set according to the operator's ability. In the case of a key combination that allows scrolling on the screen, make sure that all necessary keys are pressed so that the pressed time is the input time, then turn off any of the pressed keys. The input time is defined as the input time. Further, one specific combination is assigned to a function of converting into a native language, and in the case of Japanese, a character input in Roman characters can be converted into kanji katakana. In the present invention, it is possible to add other input types due to the attributes of the present invention.
In addition, the invention provides a device that can basically input a document with five keys, but of course restricts installation of a sixth input key or an input button to perform other special functions. is not. The present invention is an input system for a small electronic device or information communication device having the above configuration.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is an external view of a mobile phone capable of inputting characters according to the present invention. The first key (1) is on the right side (13), the second key (2) to the fifth key (5) is on the left side (14),
They are arranged in order. When you hold the phone with your right hand,
As shown in the figure, the first key (1) is thumb and the second key (2)
, The third key (3) is operated with the middle finger, the fourth key (4) is operated with the ring finger, and the fifth key (5) is operated with the little finger. Since the input keys are arranged on the side surface, the size of the display screen (7) on the front surface is larger than that of the related art. In the present embodiment, the right-hand mobile phone is used, but the left-hand mobile phone has a symmetric key arrangement. FIG. 3 is a block diagram of the entire character input system according to the present embodiment. An input signal is sent from a keyboard to a microprocessor of the computer, and the microprocessor converts the data into characters based on data in a writing memory such as an EPROM, and displays the characters on a display one after another. Each key is basically turned on when pressed and turned off when released, but the computer recognizes the key combination only for the set time (first set time) when there is a pressed key combination This is when it is pressed. When a change occurs in the pressed key combination, the input is reset. Further, when the button is kept pressed for a long time (second set time), it can be obtained as another input signal by arbitrarily setting a timer attached to the key. Thus, for example, lowercase letters and uppercase letters, or punctuation marks and punctuation marks can be obtained by using the same combination of keys and separating them into short press and long press. Since the first set time and the second set time can be set according to the level of the operator, there is a merit that a skilled operator can input more quickly. less than,
The operation with the above five input keys will be described in detail. The on state of each key is expressed as "1", the off state is expressed as "0", and the first to fifth keys are arranged in order from the left side to indicate the on / off state of the input keys. Will be explained. For example, when expressed as “10100”, it indicates that the first key is on, the second key is off, the third key is on, the fourth key is off, and the fifth key is off. The character input of the mobile phone of this embodiment is performed in the text mode. In the text mode, the following four specific on / off combinations other than alphabetic character combinations are applied. Key combination Normal press (long press) 00101: Japanese / English input switch 10101: Return to previous input state 11110 (Japanese mode) Reading mark (punctuation mark) (English mode) Comma (period) 01111 (Japanese mode) Kanji Katakana conversion (English mode) Space 11111: Switching between alphabet / editing & numbers (text / communication switching) Here, the reason that the numeric input is in the same mode as the editing is that the editing mode is copy -Has editing functions such as cut / paste, file saving / extracting, and input of special symbols. Ten numbers are treated as priority special symbols. In other words, of the 31 combinations in the edit & numeric mode, 10 are preferentially allocated to numbers from 0 to 9. Also, move the cursor to left, right,
Up and down scrolling and 5 types of input for confirming input,
This editing mode has priority. In a mobile phone, the communication function is prioritized, so that when the power is turned on, the communication mode appears as a normal mode. Therefore, the document input is performed after the user enters the text mode by pressing the combination of “text / communication switching”. Other types of portable information devices and the like are not necessarily required. For example, a portable computer and the like may use a text input mode in which text can be created in a normal mode. Less than,
The operation functions assigned to the combinations of the on / off states of the five input keys in the text mode of the embodiment of FIG. 1 will be described. The input is performed using the alphabet in both the English mode and the Japanese mode. In arranging the alphabet in the on / off combination of the five keys, the following was considered. B) Grouping One of the objects of the present invention is to provide a method of pressing keys that is easy to remember. In general, whether a character or a combination of on and off, a regular arrangement is easier to remember than a random arrangement. However, as shown below, the alphabets were used in consideration of the frequency of use and the like, so that it was not possible to simply put all the alphabets in alphabetical order. On the other hand, the group of the five keys is also divided into groups where the regularity is clear. B) Human body function One of the objects of the present invention is to achieve simple high-speed input with one hand, but human fingers generally do not respond at the same level. In the experiment, when the finger combination was in an off state, that is, a finger combination in which the middle finger and the little finger pressed the key simultaneously and turned on while releasing the key from the key was included, the input speed was extremely reduced. In the present invention, such a combination is considered so as not to be used as much as possible. That is, even if used, the characters are assigned to the characters "Q", "X" or "Z" which are the least frequently used characters. In addition, when adjacent fingers pressed the key at the same time, the input speed was faster than when using one finger at a time. Furthermore, the movement of the thumb alone did not affect the input speed of other fingers. Based on these results, the group of input key combinations is given a first priority for a small number of ONs, a second priority for the state of the thumb, and a third priority for the combination of adjacent fingers. Then, arrange them in the order of the fingers, and in the order of groups in which input is easy, "10000, 01000, 00100, 0001"
000001 "group," 01100,0011 "
0,00011 "group," 11000,1010
0, 10010, 10001 "group," 1110
0, 10110, 10011 "group," 0111
17 combinations divided into 5 groups of 0,00111 "groups were selected. C) Frequency of use By arranging simple and easy key combinations for frequently used characters, the input speed was increased. However, on the other hand, it is also necessary to make the combination easy for the user to remember.In the present invention, the alphabetical order is considered based on the frequency of use of English and Japanese,
Character groups are sorted in order of frequency of use. In the case of Japanese, most of the consonants and vowels form one word in pairs, and vowels are used more than 50% of the time, so they are vowels. "
A, I, U, E, and O "groups were grouped specifically in ascending order, and the others were selected in alphabetical order from the alphabet with the highest frequency of use. The most frequently used group was" R, S, and T "groups;hereinafter," K, L, M, and N "groups;
The combination of the group of "B, C, D" and the group of "G, H" follows. 17 divided into these five groups
I chose the letters. As described above, 17 characters divided into 5 groups are arranged in the order described above in 17 combinations divided into 5 groups. Other characters are arranged in vacant combinations so as to be easy to remember, with emphasis on the relevance to the already arranged alphabets as much as possible. In the present embodiment, the other nine characters “F, J, P, Q, V,
W, X, Y, Z ”are the remaining combinations“ 0101 ”
1,01001,01010,01101,1101
0, 11001, 11101, 10111, 1101
1 ". In the present invention, the input in the Japanese mode is input in Roman characters. At the time of input, the input alphabet characters are displayed on the display screen. As you type, the Hiragana reading of the Roman alphabet is automatically converted and displayed one by one.In the middle of this, pressing the key combination of "Kanji Katakana conversion" will display the flat Kanji and Katakana that are input. Appears on the screen. While pressing the key combination of the scroll function, the desired kanji can be selected and input can be confirmed. 2 key combinations for "Kanji Katakana Conversion"
If you press the key several times in succession, the input will be confirmed as hiragana. The key combination of the scroll function used in the present embodiment is as follows: 11110: move cursor upward, 01111: move cursor downward, 11100: move cursor left, 00111: move cursor right, 01110: move cursor It is possible to input by confirming selection and on / off order combination of. The handling of the combination of input signals used for scrolling is pre-programmed and differs from normal character input. In other words, the input key which has been pressed last among the keys of the target combination has been pressed after the arbitrarily determined time (first set time) has elapsed while the input key is in the ON state. The time until one of the keys is turned off is treated as the key input time, during which time the scroll function operates. It is also possible to increase the scroll speed in units of time during scrolling on a program. Considering the above-mentioned operability so that numbers can be input at high speed to key combinations in the edit mode, emphasis is placed on combinations with a small number of ons and combinations of pairs. It was arranged as follows. 10000: 1, 01000: 2, 00100: 3, 000010: 4, 00001: 5, 11000: 6, 01100: 7, 00110: 8, 00011: 9, 10001: 0 Since other special functions are actually required, Although it has more functions, a list of the functions described above is as follows. The alphabet in parentheses indicates an input when the key is pressed and held. Key state Alphabet input (in case of long press) Edit / numerical mode 10000: a (A) 1 11100: b (B) Move cursor to left 10110: c (C) 10011: d (D) 00010: e (E) 4 01011: f (F) 01110: g (G) Confirm selection at cursor position 00111: h (H) Move cursor rightward 01000: i (I) 20 01001: j (J) 11000: k (K) 6 10100 : L (L) 10010: m (M) 10001: n (N) 000001: o (O) 5 01010: p (P) 01101: q (Q) 01100: r (R) 7 00110: s (S) 8 00001: t (T) 9 00100: u (U) 3 11010: v (V) 11001: w (W) 11101: x (X) 10 111: y (Y) 11011: z (Z) 00101: Switching between Japanese input / English input 10101: Return to the previous input state 11110: Move cursor upward (Japanese mode) Reading point (punctuation mark) (English Mode) Comma (period) 01111: Move cursor downward (Japanese mode) Kanji Katakana conversion (English mode) Space 11111: Switch alphabet / editing & numbers (text / communication mode switching) Call mode in this embodiment The outline of the input in is described below. Normally, the user directly inputs a number, makes a call for a call, and then disconnects. Then, the operation is performed as follows: 10000: 1, 01000: 2, 00100: 3, 000010: 4, 00001: 5, 11000: 6, 01100: 7, 00110: 8, 00011: 9, 10001: 0, 11100: outgoing, 00111: disconnect, 11111: text / communication mode switching. Also, if the phone number is already stored in the mobile phone, you can scroll through the phone number list on the screen to search, determine the target number, and make a call. It is also possible to input with. 11110: Move cursor upward, 01111: Move cursor downward, 11100: Move cursor left, 00111: Move cursor right, 01110: Select and confirm by cursor position Other useful in call mode There are functions such as "Register" and "E-mail creation", which are appropriately allocated to the remaining input key combinations. In the present invention, basically, 31 combinations of lower ranks can be created under a certain combination, and 31 combinations of lower ranks can be created for a certain combination. That is, the number of combinations can be made infinitely exponentially by overlapping the generations of combinations, so that all required functions can be taken in. FIG. 4 shows an embodiment of the present invention in which character input keys are arranged on the side of the mouse input device of the present invention. Mouse housing (21)
Is held with the right hand, the thumb is the first key on the upper left side (26), and the index finger to the little finger are the second key on the upper right side (25).
The key is arranged at a position between the key (2) and the fifth key (5). The input mode is composed of only the text mode, but the key input method is as described above. The rotation position ball (22) is attached to the lower surface (24) of the mouse housing (21), but may be attached to the upper surface and operated with a finger or palm. In addition, the gist of the present invention is not impaired even if a mechanism that propagates a signal using infrared rays or radio waves is used instead of the cable (23).

[0006]

According to the present invention, several characters can be input and various functions can be operated by inputting five keys. Therefore, the size and weight of a small information device or communication device which cannot be obtained in the past can be further reduced. And a large display screen can be realized.
In addition, since alphabets and numbers are arranged in a combination of one character on and off with emphasis on frequency of use and movement of fingers, it is possible to input easily and quickly with one hand, You can do other work with one free hand. In addition, when attached to a mouse input device, a conventional keyboard is not required for character input, and a large free space on the desk can be obtained.

[Brief description of the drawings]

FIG. 1 is an external view of a mobile phone using an input system of the present invention.

FIG. 2 is a use state diagram of a mobile phone using the input system of the present invention.

FIG. 3 is a signal block diagram to the computer of the input system of the present invention.

FIG. 4 is an external view of a mouse device using the input system of the present invention as viewed from a bottom direction.

FIG. 5 is an external view of a conventional mobile phone.

FIG. 6 is a diagram of a conventional character input numeric keyboard.

FIG. 7 is a layout diagram of a one-hand input keyboard of US Pat. No. 5,281,966.

FIG. 8 is an external view of a one-hand input keyboard of US Pat. No. 4,791,408.

[Explanation of symbols]

 1: 1st key 2: 2nd key 3: 3rd key 4: 4th key 5: 5th key 6: power switch 7: display screen 8: antenna 9: microphone 10: speaker 11: housing 12: top surface 13 : Right side 14: Left side 21: Mouse housing 22: Rotating position ball 23: Cable 24: Lower side 25: Upper right side 26: Upper left side 31: Input key area 32: Talk button 33: Disconnect button 34: Scroll key area 35 : Special function key area 36: Input key 41: Insertion port for combining display screens 42: Two-way input pad

Claims (13)

[Claims] 1. A computer having a word processor function is built in or connected to a housing to which a plurality of character input keypads are attached by a cable or wireless communication, and sends a status signal of the keypad to the computer.
In a system for inputting alphabets, numerals, and other commands, at least five characters for inputting characters when a surface in contact with a top surface or a bottom surface having the largest area of the housing as a ridge is a side surface. An input key is arranged on the side surface, and when the housing is held with one hand, the first key to the fifth key are located at positions corresponding to each finger in the order of thumb, index finger, middle finger, ring finger, and little finger. The five keys from the first key to the fifth key are normally in an off state, but when pressed with a finger, an on state signal is sent to the computer, and the five keys are arranged. A one-handed keyboard system characterized in that alphabets, numbers or commands can be input by a combination of the on / off states of the keys. 2. The first key according to claim 1, wherein the upper surface or the lower surface is a pseudo-rectangle having a rounded corner or a pseudo-polygon. A one-hand input keyboard system, wherein the four keys from a key to the fifth key are not arranged on the same side. 3. The one-hand input keyboard system according to claim 1, wherein a display screen is provided on the upper surface. 4. The one-hand input keyboard system according to claim 1, wherein a rotation position ball mechanism for a mouse is provided on the lower surface or the upper surface. 5. The combination of on / off states of the first key to the fifth key according to claim 1,
One specific combination is assigned to a command input for switching between an alphabet input mode and a numeric input mode. In the alphabet input mode, at least alphabetic characters are assigned to combinations other than the specific one combination. , And in a number input mode, at least a number from 0 to 9 is allocated to a combination excluding the specific one combination. 6. The combination according to claim 1, wherein the combination of on / off states of the first key to the fifth key is
One specific combination is assigned to a command input for switching between a Japanese input mode and an English input mode, and in the Japanese input mode, a combination excluding the above-mentioned specific combination is used in combination with the alphabet. A total of 29 combinations of input of 26 characters, input of a command for performing "kanji and katakana conversion", input of a "punctuation mark", and input of a command for performing "return to the previous state" are arranged. In addition, in the English input mode, the combinations other than the above-mentioned one specific combination include the input of 26 letters of the alphabet, the input of "space", the input of "comma symbol", and the input of "previous state". At least 2 commands
A one-handed input keyboard system comprising nine combinations. 7. The method according to claim 1, wherein the third key and the fifth key are pressed by a finger, and the fourth key is not pressed by a finger. When arranging combinations of up to 5 keys as alphabetic characters, the alphabetic characters are “Q” and “
A one-hand input keyboard system, which is either X "or the letter" Z ". 8. The method according to claim 1, wherein, among the 31 combinations of the on / off state from the first key to the fifth key, a combination with a small on state is given first priority, and the first key is turned on.・ The off state is given the second priority, and the first state is given
Combinations in which keys other than the keys are on next to each other are grouped as the third priority, and character groups that are divided into groups having higher priorities in consideration of the use frequency and alphabetical order are used as the priority groups. A one-handed input keyboard system in which characters are assigned to key combinations among combinations of groups by allocating the groups in ascending order. 9. The method according to claim 1, wherein the time when the input key is off is expressed as “0”, and the time when the input key is on is expressed as “1”. When the on / off state is represented by sequentially arranging up to five keys from the left side, the order of the group of combinations that can be easily and easily input is “10000, 01000, 00100, 0001”
000001 "group," 01100,0011 "
0,00011 "group," 11000,1010
0, 10010, 10001 "group," 1110
0, 10110, 10011 "group," 0111
Seventeen combinations divided into five groups of 0,00111 "groups are selected, and the most frequently used alphabet groups" A, I, U, E, O "set in the order of usage frequency are assigned to each group. Group of ”
R, S, T "groups," K, L, M, N "groups," B, C, D "groups, and" G, H "groups. A one-hand input keyboard system, wherein characters are arranged in respective combinations in the order of description. 10. The method according to claim 1, wherein the time when the input key is off is expressed as “0”, and the time when the input key is on is expressed as “1”. 5
When the keys are arranged in order from the left side to indicate the on / off state, the numbers are 1: 10000, 2: 01000, 3: 00100, 4000010, 500001, 6: 11000, 7: 01100, 8: A one-hand input keyboard system for inputting in an on / off order combination of 0110, 9: 00011, 0: 10001. 11. The input key according to claim 1, wherein when one or more of the input keys from the first key to the fifth key are pressed and key-input is performed in a desired combination, the input key pressed last is another key. When the arbitrarily determined first set time has elapsed in a state where the key is already turned on together with the key that has already been pressed, key input can be performed in the above-described combination, A one-hand input keyboard system characterized in that it can be treated as another input signal when a predetermined second set time has elapsed. 12. The method according to claim 1, wherein one or more of the first to fifth keys are pressed to obtain input states from the first key to the fifth key assigned to a target alphabetic character. When the first set time arbitrarily determined has elapsed in a state where the most recently pressed input key has been turned on together with other already pressed keys, the target alphabetic character is displayed. Can be input, and if the second set time arbitrarily determined elapses as it is, an alphabet in which uppercase and lowercase characters are interchanged is obtained while being the target alphabetic character. One-handed keyboard system. 13. The method according to claim 1, wherein when one or more of the input keys of the first key to the fifth key are pressed to input a key, the input key pressed last is turned on and the other input keys are turned on. From the time when an arbitrarily determined time elapses with the key turned on together with the already pressed key to the time when any of the above-mentioned key or keys is turned off. A one-handed keyboard system characterized in that it is treated as key input time.