JP2000155641A - Keyboard controller and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the erroneous input of a key owing to the simultaneous depression of adjacent keys on a key matrix. SOLUTION: In a keyboard having a key matrix 4 where plural keys are arranged in a matrix form, when the other key is inputted later before the release of a key which is previously inputted, a CPU 1 inspects the position relation of the key which is previously inputted and the key which is inputted later on the key matrix by referring to data of an adjacent key code table. When it is the key arranged in an adjacent position, the input of the key which is inputted later is invalidated, and erroneous input is informed to an input operator by using a warning part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard and a keyboard control method, and more particularly to a keyboard and a keyboard control method most suitable for use in a small notebook computer and a PDA (Personal Digital Assistant).

[0002]

2. Description of the Related Art In recent years, with the miniaturization of electronic parts such as a CPU and the progress of packaging technology, personal computers (PCs) having a small size suitable for carrying have been developed. In addition, portable small-sized information devices called PDAs, which have functions narrowed down to electronic memos, e-mails, schedule management, and the like, have been used. Handwritten character recognition and the like have come to be used as input means of these portable small information devices, but keyboards are still often used due to problems such as input speed and recognition accuracy. However, the size of the housing of a small notebook PC or PDA is limited, so that the keyboard and its keys themselves have to be reduced in size.

As described above, in a conventional small notebook PC or PDA, since the keyboard and its keys themselves are becoming smaller in size, even a user who is skilled in keyboard operation can press a key. Occasionally, an erroneous key input may be caused due to the fact that adjacent keys are simultaneously pressed with the same finger.

In order to prevent erroneous input by simultaneously depressing keys, an erroneous input pattern is stored in advance as described in Japanese Patent Application Laid-Open No. Hei 7-13666, and erroneous input is performed by matching this pattern. In conjunction with the kana-kanji conversion function described in Japanese Patent Application Laid-Open No. Hei 10-319739 to infer an input key that seems to be correct from the input key code, without re-inputting the key. Have been proposed.

[0005]

However, in the conventional system for preventing erroneous input due to simultaneous depression of adjacent keys, an erroneous input pattern is prepared in advance, or a combination with kana-kanji conversion is used. Complex processing such as inference is required. Also, JP-A-2-123
Although the configuration is simple according to the configuration described in Japanese Patent Publication No. 17,
Since the input time difference is determined and simultaneous depression is determined, there is a risk that erroneous determination may occur due to individual differences in key input speed, and frequent incorrect input may cause discomfort to the input user. was there.

An object of the present invention is to solve this problem, and to provide a keyboard and a keyboard control method which can correctly determine simultaneous depression of adjacent keys and prevent erroneous key input.

It is another object of the present invention to provide a keyboard and a keyboard control method which prevent erroneous key input due to simultaneous depression of adjacent keys.

[0008]

In order to attain the object of the present invention, a keyboard control device scans a key matrix in which a plurality of keys are arranged in a matrix and scans the key matrix to determine which key has been operated. Key detecting means for detecting, and when at least one second key is pressed in a state where the first key is pressed by the key detecting means, the pressing operation of the first key and the pressing of the second key are performed. Control means for selectively outputting the key code of the second key based on the positional relationship between the first key and the second key, irrespective of the time difference from the pressing operation. .

When the control means determines that the first key and the second key are adjacent to each other, the control means determines whether the first key and the second key are adjacent to each other.
The output of the key code of the key can be prohibited.

When the apparatus further comprises an adjacent key table for storing data indicating adjacent keys on the key matrix, the control means refers to the adjacent key table and sets the first key and the second key. Is determined whether or not are adjacent. The adjacent key table may store data indicating adjacent keys on the key matrix in the form of a key code.

Further, even when the control means determines that the first key and the second key are adjacent to each other, when the first key is one of a plurality of predetermined special keys, , The key code of the second key can be output. Here, the plurality of special keys are determined in advance based on the functions assigned to each of the plurality of special keys.

When the control means stops outputting the key code of the second key and outputs a warning signal, the keyboard control device further comprises a warning means for issuing a warning in response to the warning signal. It is characterized by doing.

According to another aspect of the present invention, there is provided a keyboard having a key matrix in which a plurality of keys are arranged in a matrix, wherein the key matrix scans the key matrix to detect a key operated by an input operation. Detecting means for detecting whether or not the detected key is a key located at an adjacent position on the key matrix, when the operation of at least two or more keys is detected within the same detection timing period by the key detecting means; There is provided an adjacent key operation detecting means for detecting, and a key operation invalidating means for invalidating the key input operation when the adjacent key operation detecting means detects an input operation of an adjacent key. When a key operator simultaneously presses two keys on the key matrix, the adjacent key operation detecting means detects an input operation of an adjacent key, invalidates the key input, and prevents erroneous input.

According to another aspect of the present invention, there is provided a keyboard having a key matrix in which a plurality of keys are arranged in a matrix, wherein the key matrix scans the key matrix and detects a key operated by an input operation. Detecting means for detecting a key pressed by at least two or more other keys in a state where one key is pressed by the key detecting means, wherein the detected key is located at an adjacent position on the key matrix; Adjacent key operation detecting means for detecting whether or not the key input operation is performed, and key operation invalidating means for invalidating the key input operation when the adjacent key operation detecting means detects an input operation of an adjacent key. Thereby, simultaneous depression can be reliably determined.

Further, it is desirable that the key operation invalidating means validates the key input operation when an adjacent key input operation with a predetermined specific key is detected. This predetermined specific key is at least a control key,
It is desirable to include one key selected from a shift key, an alt key, or a function key. This is because such a specific key is often programmed to have a specific function by simultaneously pressing other keys.

Further, it is preferable that the key operation invalidating means includes a warning means for notifying the input operator that the key input has been invalidated. This is for notifying the input operator of invalid key input and prompting re-input.

The detection of the adjacent key performed by the adjacent key operation detecting means can be realized by providing an adjacent key code storing means in which information of adjacent keys is stored in advance.

In order to achieve the above object, according to the keyboard control method of the present invention, in a key matrix having a plurality of keys arranged in a matrix, after a first key that has been previously input is released, the key is released before the first key is released. When the second key is input from, the positional relationship between the first key and the second key on the key matrix is inspected, and when the keys are arranged at adjacent positions, the input operation is performed later. Invalidates key input.

Here, if at least one of the key operated first and the key operated later is a predetermined special key, the key operated earlier and the key operated later are operated. By validating both inputs of the key, it is possible to cope with a program for performing a specific operation in combination with a special key such as a control key.

Here, the specific key desirably includes at least one key selected from a control key, a shift key, an alt key, and a function key. This is because such specific keys are often programmed to have specific functions by simultaneously pressing other keys.

Further, it is desirable that when the input of the operated key is invalidated, the input operator is notified by voice or light that the key input is invalidated. This is for notifying the input operator of the invalidation of the key input and prompting the input operator to re-input.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A keyboard control device according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the keyboard control device according to the first embodiment of the present invention. In FIG. 1, the keyboard according to the first embodiment of the present invention has a CP
It includes a U1, a warning unit 2, an adjacent key code storage unit 3, and a key matrix 4. The CPU 1 includes a scanning pulse output unit 11,
A control unit 12, an input unit 13, and a data output unit 14 are provided.

The key matrix 4 has a plurality of keys arranged in a matrix. The plurality of keys include numeric keys, alphabet keys, hiragana keys, special keys, and the like. The special key is the shift key “Shift
t ”, control key“ Ctrl ”, Alt key“ Al
t "and a predetermined key such as a function key" Fn ".

The adjacent key code storage unit 3 stores an adjacent key code of each key on the key matrix 4. The warning unit 2 issues a warning by light, sound, or the like in response to the input warning signal.

The control unit 12 has a flag A, a flag B,
It has a register C and a register D (not shown). Control unit 1
2 detects the key press operation using the flag A, the flag B, the register C, and the register D according to a program stored for key press detection.

The control unit 12 operates in accordance with program control.
The scanning pulse output unit 11 is controlled so that a scanning pulse is output to the key matrix 4 as needed to detect the pressing and releasing of the key. As a result, the key matrix 4 is scanned. At this time, the key code of the key operated by the user is input via the input unit 13 as key press information.
It is taken into PU1.

The control unit 12 constantly monitors key press information received by the input unit 13. When the simultaneous pressing of two keys is detected, the adjacent key code storage unit 3 is referenced to determine whether the simultaneously pressed key is an adjacent key. If it is not an adjacent key, the data output unit 14
The key code is output to a main unit such as a personal computer (not shown) connected to this keyboard via the keyboard. When these keys are adjacent keys, if the input key is an adjacent key, the key pressing operation is invalidated, and no new key code is sent to the data output unit 14.

When the keys are adjacent keys, the input is invalidated and the warning unit 2 outputs a warning signal. Thereby, the warning unit 2 issues a warning by light, sound, or the like. The input operator can recognize the erroneous input by this warning, and can correct the key input by releasing the key pressed down later. As a result, the erroneous input rate from the keyboard can be reduced, and the correction time can be reduced.

Here, the method of detecting simultaneous depression of two keys can be determined as simultaneous depression when two keys are pressed within one key scanning timing.
Another key 2 that is different when one key is pressed
When the above keys are pressed, it can be determined that the keys are simultaneously pressed.

Next, the operation of the keyboard control system according to the first embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 2 shows a flowchart of the key detection program stored in the CPU 1.

In the operation of the present invention, a flag A, a flag B, a register C, and a register D are used.

The flag A is set to "1" when a key is first detected, and is reset to "0" when the release of the key is detected. However, if the first key pressed is a predetermined special key such as a shift key "Shift", a control key "Ctrl", an Alt key "Alt", or a function key "Fn", "
0 ".

The flag B is set to "1" when the pressing of a key adjacent to the key is detected while the pressing of a key is detected (A = 1), and the release of the key is detected. Then, it is reset to "0".

The register C stores the key code of the key whose press is first detected, and if the next detected key is not an adjacent key, the key code of that key is overwritten. The register D stores the key code of the key whose press is detected while the flag A is "1".

First, initial settings are made in step S1. The initial values are flag A = 0, flag B = 0, register C = register D = "00H".

The control section 12 controls the scan pulse output section 11 so as to output a scan pulse to the key matrix 4. Further, the input unit 13 is controlled to input the key code of the pressed key (step S2).

In step S3, it is determined whether any key has been operated. That is, it is determined whether any key is pressed or released.
When it is determined in step S3 that any key has been pressed, the control unit 12 refers to the adjacent key code storage unit 3 to determine whether the pressed key is an adjacent key of the already pressed key. Determine whether If it is determined that the pressed key is an adjacent key, the flag B is set to 1. When it is determined that the key is not an adjacent key, the flag B is set to 0.
Remains. Further, a key code corresponding to the pressed key is written into the registers C and D based on the flags A and B.

At step S4, it is determined whether or not the flag B = 1. That is, when the adjacent key is pressed, the control unit 12 outputs a warning signal to the warning unit 2. Thereafter, the control returns to step S2.

If it is determined in step S4 that B = 0, it is determined in step S5 whether the flag A is 1. If the flag A = 0, in step S6,
It is determined whether the pressed key is a special key.

If it is determined that the pressed key is a special key, the key code of the pressed key stored in the register C is output to the main body via the data output unit 14 in step S7. You. Thereafter, the control returns to step S2.

If it is determined in step S6 that the pressed key is not a special key, the flag A is set to 1 in step S8. Subsequently, step S9
Then, the key code of the key pressed this time is set in the register C. Thereafter, step S7 is executed, and the key code is output to the main body.

When it is determined in step S5 that the flag A = 1, that is, when it is determined that another key is already pressed, whether the key pressed in step S10 is a special key is determined. Is determined.

If it is determined in step S10 that the pressed key is a special key, the flag A is reset to 0, and then step S7 is executed. Thereby, the key code of the pressed special key is sent to the main body.

If it is determined in step S10 that the pressed key is not a special key, the key code of the pressed key is set in the register D in step S12.
Thereafter, in step S13, the key code stored in the register C is compared with the key code stored in the register D. At this time, the adjacent key code storage unit 3 is referred to to determine whether the keys corresponding to the key codes stored in the registers C and D are adjacent to each other.

When it is determined in step S14 that the keys corresponding to the key codes stored in the registers C and D are adjacent to each other, the flag B is set to 1 in step S15. The operation of outputting the key code of the pressed key to the main body is stopped.
At the same time, a warning signal is output to the warning unit 2. This informs the user that the adjacent key has been pressed. Thereafter, the control returns to step S2.

When it is determined in step S14 that the keys corresponding to the key codes stored in the registers C and D are not adjacent to each other, the key code of the pressed key is stored in the register C in step S17. Is set. Thereafter, the key code of the key pressed in step S18 is output from the register C to the main unit. Thereafter, the control returns to step S2.

If it is determined in step S3 that the key operation is to release the key, step S19 is executed. In step S19, it is determined whether the flag B = 1.

When it is determined in step S19 that the flag B = 0, it is determined in step S20 whether the released key is a key corresponding to the key code stored in the register C.

If it is determined that the key released in step S20 is a key corresponding to the key code stored in the register C, the flag A is reset to 0 in step S21, and the key released in step S22 is reset. The key code is output to the main unit. Thereafter, the control returns to step S2.

If it is determined that the key released in step S20 is not a key corresponding to the key code stored in the register C, step S22 is directly executed.

When it is determined in step S19 that the flag B = 1, the key released in step S23 is
It is determined whether the key is a key corresponding to the key code stored in the register D.

If it is determined in step S23 that the released key is not a key corresponding to the key code stored in the register D, it is determined in step S24 whether the key code of the released key has been output. Is determined. If not, the control returns to step S2. If already output, step S
Step 22 is executed.

If it is determined in step S23 that the released key is the key corresponding to the key code stored in the register D, both flags A and B are reset to 0 in step S25. Then, step S26
Then, the key code of the pressed key is restarted. Further, the warning operation is stopped. Thereafter, the control returns to step S2.

The above operation will be described with a specific example.

In the following description, “Ctrl” is pressed → “f” is pressed → ”
Press "h" → Press "Shift" → Press "k" → Release "f" → Release "k" →
An example will be described in which a key press is detected in the order of “k” pressed → “i” pressed → “z” pressed → “z” released → “h” released → “i” released.

(1) If the pressing of the "Ctrl" key is detected first, a pressing code is output, and the flow returns to step S2 in FIG. 2 to detect the key pressing and release (steps S2 → S3).
→ S4 → S5 → S6 → S7 → S2). The “Ctrl” key is a special key that requires a combination, and is not subject to the adjacent key code check. Therefore, the flag A remains "0".

(2) Next, when the press of the “f” key is detected, the flag A is set to “1”, the key code corresponding to “f” is stored in the register C, and the pressed code is Output (Step S2 → S3 → S4 → S5 → S6 → S8 → S9 → S
7 → S2). Since the "f" key is a key other than the special key, it is subjected to the adjacent key code check.

(3) Next, when the pressing of the "h" key is detected, the key code of "h" is stored in the register D, and the key code of the adjacent key corresponding to the register C value ("f") is stored. Compared to the table. Since "h" is not an adjacent key of "f", the key code of "h" is overwritten in the register C and a press code is output (steps S2 → S3 → S4 → S5 → S10 → S1).
2 → S13 → S14 → S17 → S18 → S2). Since the key code “h” is stored in the register C, the target of the adjacent key code check is switched from “f” to “h”.

(4) Next, when the press of the "Shift" key is detected, the flag A is reset to "0" and a press code is output (step S2 → S3 → S4 → S5 → S10 → S11 → S
7 → S2). Since the pressing of the special key is detected, there is no adjacent key code check target.

(5) Next, when the pressing of the “k” key is detected, the flag A is set to “1”, the key code corresponding to “k” is stored in the register C, and the pressing code is Output (Step S2 → S3 → S4 → S5 → S6 → S8 → S9 → S
7 → S2). This means that the target of the adjacent key code check is "k".

(6) Next, when the release of the "f" key is detected, a release code is output (steps S2 → S3 → S19 →
S20 → S22 → S2). At this time, the target of the adjacent key code check remains the “k” key.

(7) Next, when the release of the “k” key is detected, the flag A is reset to “0” and a release code is output (steps S2 → S3 → S19 → S20 → S21 → S22 → S
2). Since the key to be subjected to the adjacent key code check is released, there is no target for the adjacent key code check.

(8) Next, when the press of the "k" key is detected, "k" is subjected to the adjacent key code check as in (5) (steps S2 → S3 → S4 → S5 → S6). → S8 → S9 → S
7 → S2).

(9) Next, when the pressing of the “i” key is detected, the key code of “i” is stored in the register D, and the adjacent key code storage unit 3 is referred to, and the value of the register C is read.
The adjacent key code corresponding to ("k") is examined. "i" is "
Since it is the adjacent key of "k", the flag B is set to "1" and the output of the key press code is stopped, and the user is warned by light, sound, or the like that the adjacent keys are simultaneously pressed.
(Step S2 → S3 → S4 → S5 → S10 → S12 → S13 → S14 → S15 →
S16 → S2). The output of the key press code is stopped, and the warning to the user is continued until the "i" key is released.

(10) Next, when the pressing of the "z" key is detected, no pressing code is output, and the process returns to step S2.
(Step S2 → S3 → S4 → S2). This is because the output of the key press code has been stopped.

(11) Next, when the release of the "z" key is detected, the release code is not output, and the process returns to step S2 (S
2 → S3 → S19 → S23 → S24 → S2). In (10), the release code is not output because the press code of the “z” key is not output.

(12) Next, when the release of the "h" key is detected, a release code is output, and the process returns to step S2 (S2).
→ S3 → S19 → S23 → S24 → S22 → S2). Press code of "h" is
Since the output of the press code is output before the stop state, the release code is also output.

(13) Next, when the release of the "i" key is detected, since the register D value is the key code of "i", the flag B and the flag A are reset to "0" and the key is reset. The output of the press code is restarted. Also, the warning to the user is stopped. Then, return to step S2 (S2 → S3 → S19 →
S23 → S25 → S26 → S2). In this case, the release code is not output as in (11).

As described above, according to the keyboard and the control method of the embodiment of the present invention, the key press detection operation is stopped when the simultaneous press limited to the adjacent keys is detected, and a warning is issued to the user. . Thus, the erroneous input occurrence rate in the keyboard input operation can be reduced, and the erroneous input correction time can be shortened.

Next, a keyboard control device according to a second embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 3 shows an example in which the present invention is applied to a general-purpose calculator, and includes a CPU 5, a warning unit 6, and a key matrix 7.
The CPU 5 has a scanning pulse output unit 51, a control unit 52, an input unit 53, and a data output unit 54. The difference from the keyboard control device shown in FIG. 1 is that the control unit 52 stores both a program for detecting a key press and an adjacent key code table, which is a small number of keys in a general-purpose calculator. This is because the memory capacity is not so required to store the adjacent key information.

FIG. 4 shows a flowchart of the key detection program stored in the control unit 52 in the CPU 5.

In the operation according to the second embodiment of the present invention, a flag A, a flag B, a register C, and a register D are used.

The flag A is set to "1" when a key is first detected, and is reset to "0" when the release of the key is detected. However, if the first key pressed is a predetermined special key such as a shift key "Shift", a control key "Ctrl", an Alt key "Alt", or a function key "Fn", "
0 ".

The flag B is set to "1" when the pressing of a key adjacent to the key is detected in a state where the pressing of a key is detected (A = 1), and the release of the key is detected. Then, it is reset to "0".

The register C stores the key code of the key whose press is detected first, and if the next detected key is not an adjacent key, the key code of that key is overwritten. The register D stores the key code of the key whose press is detected while the flag A is "1".

First, initial settings are made in step S27.
The initial values are flag A = 0, flag B = 0, register C = register D = "00H".

In step S28, the control section 52 controls the scan pulse output section 51 so as to output a scan pulse to the key matrix 4. Also, the input unit 53 is controlled so as to input the key code of the pressed key.

In step S29, it is determined whether any key has been operated. That is, it is determined whether any key is pressed or released. When it is determined in step S29 that any key has been pressed, the control unit 52 refers to the adjacent key code table to determine whether the pressed key is an adjacent key of the already pressed key. judge. If it is determined that the pressed key is an adjacent key, the flag B is set to 1. When it is determined that the key is not an adjacent key, the flag B remains at 0. Further, a key code corresponding to the pressed key is written into the registers C and D based on the flags A and B.

At step S30, it is determined whether or not flag B = 1. That is, when the adjacent key is pressed, the control unit 52 outputs a warning signal to the warning unit 6.
Thereafter, the control returns to step S28.

If it is determined in step S30 that B = 0, it is determined in step S31 whether the flag A is 1. If the flag A = 0, the flag A is 1
Is set to Subsequently, in step S9, the key code of the currently pressed key is set in the register C. Thereafter, in step S7, the key code of the pressed key stored in the register C is output to the main body via the data output unit 14. Thereafter, the control returns to step S28.

When it is determined in step S31 that the flag A = 1, the key code of the pressed key is set in the register D in step S35. Thereafter, in step S36, the key code stored in the register C is compared with the key code stored in the register D. At this time, by referring to the adjacent key code table, it is determined whether the keys corresponding to the key codes stored in the registers C and D are adjacent to each other.

When it is determined in step S37 that the keys corresponding to the key codes stored in the registers C and D are adjacent keys, the flag B is set to 1 in step S38, and the process proceeds to step S39. The operation of outputting the key code of the pressed key to the main body is stopped.
At the same time, a warning signal is output to the warning unit 6. This informs the user that the adjacent key has been pressed. Thereafter, the control returns to step S28.

If it is determined in step S37 that the keys corresponding to the key codes stored in the registers C and D are not adjacent keys, the key code of the key pressed in step S40 is stored in the register C. Is set. Thereafter, the key code of the key pressed in step S41 is output from the register C to the main unit. Thereafter, the control returns to step S28.

If it is determined in step S29 that the key operation is to release the key, step S42 is executed. In step S42, it is determined whether the flag B = 1.

When it is determined in step S42 that the flag B = 0, it is determined in step S43 whether the released key is a key corresponding to the key code stored in the register C.

If it is determined that the key released in step S43 is a key corresponding to the key code stored in register C, flag A is reset to 0 in step S44, and the key released in step S45 is reset. The key code is output to the main unit. Thereafter, the control proceeds to step S28.
Return to

If it is determined that the key released in step S43 is not a key corresponding to the key code stored in register C, step S45 is directly executed.

If it is determined in step S42 that the flag B = 1, it is determined in step S46 whether the released key is a key corresponding to the key code stored in the register D.

If it is determined in step S46 that the released key is not a key corresponding to the key code stored in the register D, it is determined in step S47 whether the key code of the released key has been output. Is determined. If not, the control returns to step S28. If it has already been output, step S45 is executed.

If it is determined in step S46 that the released key is a key corresponding to the key code stored in the register D, both flags A and B are reset to 0 in step S48. Thereafter, in step 49, the key code of the pressed key is restarted. Further, the warning operation is stopped. Thereafter, the control returns to step S28.

As described above, the key operation detecting operation is basically the same as the flow shown in FIG. 2, but a process for identifying whether the pressed key is a key having a combination (FIG. 2). Steps S6 and S10) are omitted. This is because, in the application of the present invention to a general-purpose calculator, special keys for inputting by combining two or more keys, such as a control key, such as a personal computer, are mostly used except for high-grade calculators. Because there is no. Therefore, in the present embodiment, whether the key whose press is detected is simply an adjacent key is identified based on the adjacent key code table stored in the control unit 52. If the adjacent key, the key press output is stopped. In addition, the operation only warns the user with light, sound, or the like.

As described above, the present invention is also effectively applied to a general-purpose calculator having no BackSpace key or Del key in a personal computer keyboard.

As described above, in the keyboard control method of the present invention, it is detected that one key is pressed and the next key is pressed, and it is determined that the keys are simultaneously pressed. In addition, simultaneous depression of keys can be detected more reliably than the method of judging the simultaneous depression of keys by determining the time difference between consecutive key inputs, and there is no danger that the key input operator will feel uncomfortable due to erroneous determination. .

[0097]

As described above, according to the present invention, simultaneous depression of adjacent keys on a key matrix can be correctly determined, and a keyboard and a keyboard control that prevent erroneous key input due to simultaneous depression of adjacent keys can be determined. A method can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a keyboard according to an embodiment of the present invention.

FIG. 2 is a flowchart of a key detection program stored in a control unit 52 in FIG.

FIG. 3 is a block diagram showing a configuration of a keyboard according to another embodiment of the present invention.

FIG. 4 is a flowchart of a key detection program stored in a control unit 52 in FIG.

[Explanation of symbols]

 1, 5: CPU 2: Warning part 3: Adjacent key code storage part 4: Key matrix 11: Scan pulse output part 12: Control 13: Input part 14: Data output part 51: Scan pulse output part 52: Control part 53: input unit 54: data output unit

Claims (17)

[Claims] A key matrix in which a plurality of keys are arranged in a matrix; key detection means for scanning the key matrix to detect an operated key; and a first key pressed by the key detection means. When at least one second key is pressed in a state in which the first key is pressed and the second key is pressed, regardless of the time difference between the pressing operation of the first key and the pressing operation of the second key. Control means for selectively outputting a key code of the second key based on a positional relationship. 2. The keyboard control device according to claim 1, wherein said control means determines a key code of said second key when determining that said first key and said second key are adjacent to each other. A keyboard control device for prohibiting output. 3. The keyboard control device according to claim 2, further comprising an adjacent key table for storing data indicating adjacent keys on said key matrix, wherein said control means stores said adjacent key table in said key matrix. A keyboard control device for determining whether or not the first key and the second key are adjacent to each other with reference to the reference. 4. The keyboard control device according to claim 3, wherein said adjacent key table stores data indicating adjacent keys on said key matrix in the form of a key code. Keyboard control unit. 5. The keyboard control device according to claim 2, wherein the control means determines the first key in advance even when the control means determines that the first key and the second key are adjacent to each other. The keyboard control device outputs the key code of the second key when it is one of the plurality of special keys. 6. The keyboard control device according to claim 5, wherein the plurality of special keys are predetermined based on a function assigned to each of the plurality of special keys. 7. The keyboard control device according to claim 1, wherein said control means outputs a warning signal when output of a key code of said second key is stopped. The keyboard control device further comprises a warning unit that issues a warning in response to the warning signal. 8. A key matrix in which a plurality of keys are arranged in a matrix, key detecting means for scanning the key matrix and detecting a key operated, and operation of at least two keys by the key detecting means. Is detected within the same detection timing period, adjacent key operation detecting means for detecting whether the detected key is a key at an adjacent position on the key matrix, and the adjacent key operation detecting means A key operation invalidating means for invalidating a key input operation when an input operation of an adjacent key is detected. 9. A keyboard having a key matrix in which a plurality of keys are arranged in a matrix, key detecting means for scanning the key matrix and detecting a key operated, and one key in the key detecting means. Adjacent key operation detection for detecting whether or not the detected key is a key located at an adjacent position on the key matrix when a depression of at least two other keys is detected in a state where is pressed. And a key operation invalidating means for invalidating a key input operation when the adjacent key operation detecting means detects an input operation of an adjacent key. 10. The keyboard control device according to claim 9, wherein said key operation invalidating means validates the key input operation when an adjacent key input operation with a predetermined specific key is detected. A keyboard control device characterized by: 11. The keyboard control device according to claim 10, wherein the predetermined specific key includes at least one key selected from a control key, a shift key, an alt key, and a function key. Keyboard control device. 12. The keyboard control device according to claim 8, wherein said key operation invalidating means includes a warning means for notifying an input operator that key input has been invalidated. Keyboard control unit. 13. The keyboard control device according to claim 1, wherein said adjacent key operation detecting means includes an adjacent key code storing means for storing information of adjacent keys in advance. Control device. 14. When the second key is operated after the first key is released before the first key is released among the plurality of keys arranged in a matrix, the first key and the second key are operated. A keyboard control method comprising: examining a positional relationship between two keys on a key matrix; and invalidating an input operation of a second key when the keys are arranged at adjacent positions. 15. An apparatus according to claim 14, wherein when at least one of said first key and said second key is a predetermined special key, the input operation of both said first key and said second key is performed. A keyboard control method characterized by being effective. 16. A keyboard control method according to claim 15, wherein said predetermined special key is at least a control key, a shift key, an alt key or a function key. 17. The keyboard control method according to claim 15, wherein when the input of the operated key is invalidated, the input operator is notified that the key input is invalidated.