JPH11119890A - Electronic device with multiple keys - Google Patents

Abstract

(57) [Summary] [Problem] When a board on which a plurality of keys are arranged is adopted for various electronic devices, when there is an unused key in a current mode selected from the model or a plurality of modes. In addition, the key input is not detected, thereby preventing an error in key recognition. SOLUTION: A first information holding means for storing information about a model of the electronic device or a set mode,
A second information holding means for storing information about keys not used in the model or mode is provided, and when there is a key input, information on the held model or mode and information on unused keys are referred to. If the key is not used, the input is processed as invalid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device used in an electronic device having a plurality of keys, and more particularly, in various electronic devices, an unused key exists depending on a mounted model or a set mode. In this case, the present invention relates to an electronic device having improved reliability by not detecting the key input. In particular, it is useful for water wetness tests.

[0002]

2. Description of the Related Art Generally, in an electronic device having a plurality of key inputs, there are keys that are not used depending on a set mode. Normally, in this type of conventional electronic device, the substrate in the main body is not changed, and only the buttons exposed to the outside are removed, so that the mass production effect of the substrate is prioritized and the cost is reduced. Conventionally, a circuit of a key input unit arranged on a substrate has the following configuration.

FIG. 3 is a diagram showing an example of a circuit configuration of a general key input unit used in electronic equipment. In the figure, K1 to K5 are keys, T1 and T
2 denotes a terminal, E denotes a power supply, R1 to R5 denote resistors, and C denotes a capacitor.

The key input unit has five keys K1 to K5.
Is provided, one end of each of the keys K2 to K5 is
It is connected to each connection point of the resistors R1 to R5 connected in series. For the resistors R1 and R5 at both ends,
The other end of the resistor R1 is connected to one end of the key K1, and the other end of the resistor R5 is connected to the power supply E. The other end of each of the keys K1 to K5 is connected to a terminal T2 serving as a ground potential. A capacitor C for passing an AC component is connected between the terminal T2 and the power supply E. The terminal T1 is provided at a connection point between the resistors R4 and R5 and the key K5. A general key input unit conventionally used has a circuit configuration as shown in FIG.

Each of the keys K1 to K5 of the input section is a key which is turned on / off by, for example, a push button switch. When any one of the keys K1 to K5 is pressed by a user, the key is electrically connected to the terminal T1. A potential is generated between the terminal and the terminal T2. The potential varies depending on the resistors R1 to R5. For example, when the leftmost key K1 is depressed, there are five resistors R1 to R5 connected in series between the power supply E and the terminal T2, so that the resistance value is maximized. The voltage drop due to the switch R5 is minimized. Therefore, in this case, the terminals T1 and T
2 has the highest potential difference.

Conversely, when the rightmost key K5 is depressed, only one resistor R5 is connected between the power supply E and the terminal T2, and the resistance value is the minimum. Therefore, when this key K5 is pressed, the voltage drop by the resistor R5 becomes maximum. The same applies when the other keys K2 to K4 are pressed, and the voltage drop by the resistor R5 has an intermediate value. Here, each of the resistors R1 to R5
Are equal, the potentials generated between the terminals T1 and T2 corresponding to the depression of the keys K1 to K5 are five levels at equal intervals.

[0007]

A conventional general key input unit uses a substrate having a circuit configuration as shown in FIG. When an electronic device with multiple key inputs is configured using such a board, if noise or short-circuiting between the electrodes due to condensation inside the main unit occurs, keys that do not originally exist in the derivative model The state becomes the same as when the button is pressed, and an operation not described in the manual is executed. As a result, the user may be erroneously recognized that a failure has occurred, or depending on the nature of the malfunction, a change in state may not be able to be returned to the original operating state, which may require repair. Occurs. According to the present invention, when such a board is employed in various electronic devices, if there is an unused key in the currently set mode among the model and the plurality of modes, the key input is not detected. It is another object of the present invention to prevent an error in key recognition.

[0008]

According to the first aspect of the present invention, there is provided an electronic apparatus comprising: first information holding means for storing information relating to a model of the electronic apparatus or a set mode; Second information holding means for storing information about keys not used in the set mode, and when there is a key input, information about the model of the first information holding means or the set mode and the second information With reference to the information on the key of the holding means, if the key is not used, the input is processed as invalid. Claim 2
In the electronic device, when there is a key input, a means for detecting a voltage from the key, a conversion means for converting the detected input voltage of the key into information that can be compared with information about the key, and a second information When it is detected from the information on the key of the holding means that the key is not used, means for comparing the key with information from the conversion means and means for judging the validity or invalidity of the key input based on whether or not the two are matched are provided. Claim 3
The electronic device holds information on keys that are not used as a table corresponding to the model of each electronic device or a set mode.

[0009]

According to the present invention, in an electronic device having a key input section having a circuit configuration as shown in FIG. 3, control of the electronic device is performed for a key which does not normally accept an input. The voltage detection range is changed by the internal processing of the microcomputer, and even if an input voltage is generated between the terminal T1 and the terminal T2, a procedure is set so that a predetermined operation is not performed. The feature is that the occurrence of a malfunction is prevented.

FIG. 1 is a functional block diagram showing an example of a configuration of a main part of an electronic device having a plurality of keys according to the present invention, which determines whether key input is valid or invalid. 1, reference numeral 1 denotes a control unit, 2 denotes a model / mode information memory, 3
Indicates an unused key information memory, 4 indicates a register, 5 indicates a key voltage detecting unit, 6 indicates a voltage value binarizing unit, and 7 indicates a comparing unit.

The model / mode information memory 2 stores information on the model of the electronic device or the set mode. This information can store information on the model and mode when the model is adopted in advance when the key input unit shown in FIG. 3 is designed, and can also be stored at the time of mounting. . The unused key information memory 3
Information on keys not used in the model or mode is stored in correspondence with the previous model or the set mode.
As the information on this key, for example, the voltage value of the unused key is stored as binary information for each model or mode. The key voltage detection unit 5 detects the voltage generated between the terminals T1 and T2 in FIG. 3 and causes the voltage value binarization unit 6 to generate key voltage information.

When there is a key input, the control section 1 refers to the model / mode information memory 2 and reads out information on the model or the set mode. Then, based on the information on the model or the set mode, information (binary information) on the unused key corresponding to the model or the set mode is read from the unused key information memory 3 and the voltage value of the unused key is read. Is stored in the register 4. If the model or the set mode is
When there are a plurality of unused keys, information on the voltage values of all these unused keys is output to the register 4.

The comparing section 7 compares the key voltage information output from the voltage value binarizing section 6 with the information on the voltage value (binary information) of the unused key held in the register 4, and compares the two. Is matched, the key input is processed as invalid. When there are a plurality of unused keys, it goes without saying that this comparison process is performed sequentially. As described above, even if the electronic device of the present invention includes a plurality of key input units, key inputs that should not be operated in the model or the set mode are ignored by the control of the control unit 1. Therefore, even if there is an unused key, an error in key recognition can be reliably prevented. The above operation is shown in a flowchart.

FIG. 2 is a flowchart showing a flow of main processing at the time of key input for an electronic device having a plurality of keys according to the present invention.

In step S1, the presence or absence of a key input is determined by referring to FIG.
Is monitored by the control unit 1 (control microcomputer). When a key input is detected, the key voltage detecting unit 5 detects the input voltage and binarizes the voltage by a voltage value binarizing unit 6 in step S2. In step S3, the control unit 1
With reference to the model / mode information memory 2,
The binarized information of the unused key is read from the unused key information memory 3 (for example, a table) according to the mode information, and is output to the register 4. In step S4, the voltage value binarization unit 6
Is compared with the binary information of the input voltage of the key output from the register 4 and the binary information of the unused key held in the register 4.

In step S5, it is determined whether or not both match. If they match, in step S6, the key input is invalidated, and the process returns to step S1. If they do not match (when the corresponding model or the set mode has a key that operates at the currently input voltage), it is determined in step S7 that a key input has been made, and Perform the following processing. When there are a plurality of unused keys, the determination in step S5 is performed for all key information. As described above, when there is no key input, if the currently set model or mode is not set, nothing is operated, the next voltage change is waited, and the key corresponding to the currently input voltage is If the setting is such that a predetermined operation is started, the predetermined operation is started and executed, and then the state is again shifted to the key voltage change waiting state.

[0017]

According to the first aspect of the present invention, the information on the model or the set mode and the information on the unused key are held, and when there is a key input, the information is referred to. When the key is not used, the input is invalidated. Therefore, in an electronic device having a plurality of key inputs, even if there is a key that is not used depending on a derivative model or a set mode as in the related art, it is possible to reliably prevent a key recognition error from occurring. And contribute to cost reduction by the mass production effect of the substrate.

According to a second aspect of the present invention, in the electronic apparatus of the first aspect, when a key is input, a voltage from the key is detected, and the detected input voltage of the key can be compared with information on the key. Means for converting key input information into information that can be compared with information on unused keys, and means for determining validity / invalidity of key input based on coincidence / mismatch between the two. ing. Therefore, it is possible to specifically configure an electronic device that can obtain the effect of the first aspect.

According to a third aspect of the present invention, in the electronic apparatus of the first aspect, key non-use information is held in a table provided in advance corresponding to a model of each electronic device or a set mode. Therefore, in addition to the effect of the electronic device according to claim 2, it is possible to quickly determine whether key input is valid or invalid.

[Brief description of the drawings]

FIG. 1 is a functional block diagram illustrating an example of a configuration of a main part of an electronic device having a plurality of keys according to the present invention, which determines whether key input is valid or invalid.

FIG. 2 is a flowchart showing a main processing flow at the time of key input for an electronic device having a plurality of keys according to the present invention.

FIG. 3 is a diagram illustrating an example of a circuit configuration of a general key input unit used in an electronic device.

[Explanation of symbols]

1 ... Control unit, 2 ... Model / mode information memory, 3 ...
Unused key information memory, 4 register, 5 key voltage detection unit, 6 voltage value binarization unit, 7 comparison unit

Claims (3)

[Claims] 1. An electronic device having a plurality of keys, a first information holding means for storing information about a model of the electronic device or a set mode, and a model or a set of the plurality of keys corresponding to the model. A second information holding means for storing information about keys not used in the mode, and when there is a key input, information about the model of the first information holding means or the set mode and second information holding An electronic device, wherein information on a key of a means is referred to, and when the key is not used, the input is invalidated. 2. A detecting means for detecting a voltage from the key when there is a key input, a converting means for converting the detected input voltage of the key into information which can be compared with information on the key, A comparison means for comparing with the information from the conversion means when it is detected that the key is not used by the information on the key of the second information holding means; The electronic device according to claim 1, further comprising: a determination unit that performs the determination. 3. The electronic device according to claim 2, wherein the second information holding unit is a table provided in advance corresponding to a model of each electronic device or a set mode.