KR100617577B1 - Apparatus and method for preventing key button error of telecommunication terminal - Google Patents

Abstract

The present invention relates to a key malfunction prevention device and method for a mobile communication terminal, comprising: a keypad embedded in a terminal case, a key button formed on an upper surface thereof and exposed through a terminal case, a metal dome switch installed on a lower surface of the keypad; In the key input device of the mobile communication terminal including a printed circuit board disposed on the lower side thereof, the internal and external key button terminals provided on the upper surface thereof, connected to the keyboard scan system by a lead wire, and selectively energized by a metal dome switch. ; At least one sensing sensor installed at an upper surface of the keypad and sensing a temperature characteristic or a current characteristic of a human body; And a sensor control unit connected to the detection sensor and a lead wire and determining the detection result to control the execution of the keyboard scan system, and inputting the input through a key button according to the execution or disregard command of the sensor control unit. By executing or ignoring this, it is to prevent a malfunction when the user does not input a key button.

According to the present invention, it is possible to prevent malfunction of the key button to increase the convenience of use, as well as to suppress the power consumption, unnecessary charging, setting change, etc., accordingly.

Key Button, Malfunction, Interrupt, Temperature, Current, Sensor

Description

Device for preventing malfunction of key of mobile communication terminal and its method {APPARATUS AND METHOD FOR PREVENTING KEY BUTTON ERROR OF TELECOMMUNICATION TERMINAL}

1 is an exemplary main sectional view showing a key input device of a terminal according to the prior art;

2 is an exemplary main sectional view showing a key malfunction prevention device of a mobile communication terminal according to the present invention;

3 is an exemplary flowchart showing a key malfunction prevention method of a mobile communication terminal according to the present invention;

♧ description of the symbols for the main parts of the drawing ♧

100 .... Terminal Case 110 .... Keypad

120 ... keybutton 140 metal dome switch

150 ... printed circuit board 160 ... internal key button terminals

170 .... External key button terminal 180 .... Keyboard scan system

200,210 .... detection sensor 220 .... lead wire

230 .... Sensor control unit

The present invention relates to an apparatus and method for preventing a key malfunction of a mobile communication terminal, which is improved to prevent a terminal from malfunctioning by pressing a key button of a mobile communication terminal by an external force regardless of a user's intention.

In general, a communication device such as a mobile communication terminal is configured with a key input device for inputting information and operating the device, the key input device of the circuit on the printed circuit board in accordance with the trend of lighter, smaller, thinner communication device A structure has been developed in which a metal dome switch for turning on / off a contact is mounted and a keypad is mounted on the metal dome switch.

For example, the conventional key input device applied to the mobile communication terminal, as shown in Figure 1, the keypad 2 is built directly below the terminal case (1), the terminal case (1) in place on the upper surface of the keypad (2) A plurality of key buttons (3) protruded upward through the installation is provided, and a metal dome switch having a semi-elliptic conductivity directly below a portion where the key button (3) is formed among the lower surfaces of the keypad (2). 4) is installed, the printed circuit board 5 is disposed below the metal dome switch 4, the internal and external key buttons that can be energized by the metal dome switch 4 on the printed circuit board 5 The terminals 6 and 7 are installed to be electrically connected to the keyboard scan system 8.

Thus, when the user presses the key button 3, the metal dome switch 4 is deformed and both ends of the inner and outer key button terminals 6 and 7 are energized for switching, and the key button 3 is pressed. When the release is released, the metal dome switch 4, which was elastically deformed, returns to its original position and is switched while releasing the connection state of the internal and external key button terminals 6 and 7.

However, such a method can not prevent the phenomenon in which the key button 3 is pressed by the force of another object not only when the user presses the key button 3 to use the terminal, but also frequently causes a malfunction. Has the drawback.

For example, most terminal users keep their terminals in their pockets or bags, and at this time, the key buttons 3, which are implemented to protrude on the keypad 2 of the terminal, easily interfere with the internal and external interferers. As it is pressed, it causes an unexpected key operation error.

In other words, irrespective of the user's intention, if the button beeps frequently or the mode set by the user is changed, the call key or the shortcut key for the Internet connection are malfunctioned. This leads to the inconvenience of having to pay huge communication fees.

The present invention was created in order to overcome the technical limitations of the prior art as described above, by using the temperature characteristics or current characteristics of the human body to detect the unwanted key button contact to prevent unnecessary operation of the key button convenience of use The main object of the present invention is to provide an apparatus and method for preventing a key malfunction of a mobile communication terminal.

The present invention, in order to achieve the above technical problem, a keypad embedded in the terminal case, a key button formed on the upper surface and exposed through the terminal case, a metal dome switch installed on the lower surface of the keypad and the print disposed on the lower side thereof A key input device of a mobile communication terminal including a circuit board, an internal and an external key button terminal provided on an upper surface thereof and connected to a keyboard scan system by a lead wire and selectively energized by a metal dome switch; At least one sensing sensor installed at an upper surface of the keypad and sensing a temperature characteristic or a current characteristic of a human body; It is characterized in that it provides a key malfunction prevention device of a mobile communication terminal connected by the detection sensor and the lead wire and judging the detection result and including a sensor control unit for controlling the execution of the keyboard scan system.

In addition, in the present invention, when the key button provided on the keypad of the mobile communication terminal is pressed and a key interrupt is generated, the internal and external key button terminals are energized by the deformation of the metal dome switch, and the input signal of the corresponding key button is output to the keyboard. A first step transmitted to the scan system; A second step of detecting a temperature value or a current value from a detection sensor provided on the upper surface of the key button at the same time as the first step, and transmitting the detection signal to the sensor controller; As a result of the determination of the sensor control unit, when the value detected by the detection sensor is a user's operation, transmits a key input signal execution command to the keyboard scan system; A third step of transmitting a key input signal disregarding command to the keyboard scan system when the interference is caused; The keyboard scanning system receiving the execution or disregarding command of the sensor control unit has a technical feature of providing a method for preventing a key malfunction of the mobile communication terminal, comprising the fourth step of executing the command and terminating the corresponding mode. .

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment according to the present invention.

2 is an exemplary main sectional view showing a key malfunction prevention device of a mobile communication terminal according to the present invention, Figure 3 is an exemplary flowchart showing a key malfunction prevention method of a mobile communication terminal according to the present invention.

As shown in FIG. 2, the prevention apparatus according to the present invention detects whether or not the user intentionally operated the key button 120 using a biometric characteristic of the human body, such as a temperature characteristic or a current characteristic. By controlling the operation signal to the scan system 180 to prevent the malfunction of the key button 120.

That is, the prevention device of the present invention is installed at least one, preferably at least two detection sensors (200, 210) spaced from each other on the top surface of the key button 120, the lead wire 220 from the detection sensors (200, 210) Withdrawal is made of a configuration connected to the sensor control unit 230.

Here, the detection sensor (200, 210) may be a temperature sensor, a current sensor, bar, in the case of using one of the temperature sensor may be a method of detecting whether or not close to the set temperature value, when using two May be a method of detecting by using a difference in detection value (temperature) from an adjacent sensor.

For example, since the normal temperature that maintains the human body, that is, the body temperature is approximately 36,5 ° C., a method of sensing a temperature up to ± 0.5 ° C. may be adopted using this as a set value.

Furthermore, in the case of the current sensor, the microcurrent value flowing through the human body is approximately 0.1 to 0.4 mA (although there may be a slight difference depending on a person's body type and age). Through the manipulation of the key button 120 by the human body or it is possible to determine whether the operation by another object.

In this case, the key button 120 is formed in the upper surface of the keypad 110 embedded in the terminal case 100 after having a structure that is exposed to the outside through the terminal case 100, which is the existing The same as, the bottom surface of the keypad 110 is provided with a metal dome switch 140, the printed circuit board 150 is disposed below the metal dome switch 140, the printed circuit board 150 A plurality of internal key button terminals 160 and external key button terminals 170 are formed on the top surface thereof, and these are electrically connected to the keyboard scan system 180 through lead wires (not shown). It is the same.

In this way, when the metal dome switch 140 energizes the internal key button terminal 160 and the external key button terminal 170 by the operation of the key button 120, the input signal by the key button 120 is output as it is. When the keyboard scan system 180 recognizes that the corresponding state of the key button 120 is pressed, that is, a key is input through the corresponding key button 120, signal processing is performed through communication with the control unit. You lose.

Therefore, the values detected through the detection sensors 200 and 210 are transmitted to the sensor controller 230, and the sensor controller 230 determines this to output a signal according to the operation of the key button 120 as an output signal. By determining whether it is not, it is possible to simply control the malfunction of the key button 120.

Hereinafter, the prevention method of the present invention will be described with reference to FIG. 3.

First, when the user presses the key button 120 while carrying the mobile communication terminal, a key interrupt is generated (S10 and S11).

That is, regardless of whether the key button 120 is pressed for the user's use or the pressing action is made by the interference, once the key button 120 is pressed, the elastic deformation of the metal dome switch 140 is naturally made. As a result, contact between the internal key button terminal 160 and the external key button terminal 170 occurs to maintain the energized state.

At the same time, the detection signal by the detection sensors 200 and 210 installed on the upper surface of the key button 120 is sent to the sensor control unit 230 through the lead wire 220 (S12).

As a result, the input signal through the corresponding key interrupt by the pressing action of the key button 120 is maintained as the output signal to the keyboard scan system 180 through the output line, but the control signal through the sensor controller 230 The execution is suspended until the reception of.

When it is detected that the user's manipulation is performed by the sensor 200, 210, for example, the temperature sensor or the current sensor through the S12 process, the sensor controller 230 transmits a control signal for executing a key input, and receives the keyboard scan system ( 180 executes the input signal through the pressing of the key button 120 as an output signal to perform a corresponding command (S13, S14).

On the other hand, if it is determined that the detection value detected through the detection sensors (200, 210) is the operation of the interferer, not the user's operation, the sensor controller 230 transmits a control signal for stopping key input to the keyboard scan system 180 In response, the keyboard scan system 180 that receives this ignores the output signal through the pressing of the key button 120 (S23 and S24).

Therefore, the moment when the user presses the key button 120, the key button 120 is pressed by detecting the temperature value distributed on the user's finger or a minute current flowing through the user through the detection sensors 200 and 210 installed on the surface thereof. It is possible to prevent the malfunction of the pressing of the key button 120 by the interferer by determining in advance whether or not by the interference.

As described in detail above, the present invention by installing a sensor on the key button to determine whether the user is pressed by the operation in advance to prevent the malfunction of the key button to increase the convenience of use, as well as the power consumption, unnecessary There is an enormous effect that can restrain billing, setting changes, etc.

Claims (4)

A keypad embedded in the terminal case, a key button formed on the upper surface of the terminal case and exposed through the terminal case, a metal dome switch installed on the lower surface of the keypad, and a printed circuit board disposed on the lower side thereof, provided on the upper surface of the keyboard by a lead wire A key input device of a mobile communication terminal connected to a scan system and including an internal and external key button terminal selectively energized by a metal dome switch; At least one sensing sensor installed at an upper surface of the keypad and sensing a temperature characteristic or a current characteristic of a human body; And a sensor control unit connected to the detection sensor and the lead wire and determining the detection result to control the execution of the keyboard scanning system. The method according to claim 1, The detection sensor is a key sensor for preventing malfunction of the mobile communication terminal, characterized in that the temperature sensor for detecting this by setting the temperature of 36.5 ± 0.5 ℃. The method according to claim 1, The detection sensor is a key malfunction prevention device of a mobile communication terminal, characterized in that the current sensor for detecting a small current of 0.1 ~ 0.4㎃. A first step in which a key interrupt is generated by pressing a key button of the terminal and the metal dome switch is deformed and an input signal of the corresponding key button is transmitted to the keyboard scan system through energization of internal and external key button terminals; A second step of detecting a temperature value or a current value from a detection sensor provided on the upper surface of the key button at the same time as the first step, and transmitting the detection signal to the sensor controller; As a result of the determination of the sensor controller, when the detected value of the sensor is a user operation, transmits a key input signal execution command to the keyboard scan system; A third step of transmitting a key input signal disregarding command to the keyboard scan system in the case of the interferer; And a keyboard scanning system receiving the execution or disregarding command of the sensor controller comprises a fourth step of terminating the corresponding mode after executing the command.

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