KR101837127B1 - Smart key of electrostatic capacity touch type and control methods - Google Patents

Abstract

A card type smart key of a capacitive touch type and a control method thereof are disclosed. A card-type smart key of a capacitive touch type according to an aspect of the present invention includes a touch circuit pattern formed on a surface of a PCB and recognizing a touch of a user, a cover And a controller for determining whether or not a normal touch is made from a change in an output value of a touch input unit constituted by a sheet and sensors constituting the touch circuit pattern and generating and outputting a function execution command corresponding to the touch position based on the discriminated information, The touch circuit pattern of the PCB is composed of electrodes constituting a self-capacitance sensor and a mutual-capacitance sensor, and the output values of the capacitance sensors and mutual capacitance sensors It is judged from the change whether the touch information recognized by the touch input unit is a normal touch intended by the user or an abnormal touch due to liquid substance contact It will be that the to control the follow-up action with a base.

Description

Technical Field [0001] The present invention relates to a smart key and a control method for a capacitive touch type card,

The present invention relates to a card-type smart key and a control method, and more particularly to a card-type smart key and a control method capable of distinguishing an abnormal touch by a normal user's touch and a liquid substance such as water by a capacitive touch method, And a control method.

Conventional automotive wireless card keys are generally structured mechanically using mechanical switches. The mechanical type card key is configured such that a user's operation force is inputted through a mechanical switch and a function command previously set in the controller corresponding to the corresponding switch to which the user's operation force is inputted is output to the vehicle side in a form of an electric signal in a form of an electric signal, do.

However, since the mechanical card key of the conventional mechanical switch type is difficult to manage the mechanical tolerances of the button switch due to the physical structure of the button switch, it is necessary to solve the waterproof problem, There is no doubt that it will be accompanied. In addition, there is a problem that an unintentional malfunction occurs because the switch is depressed unintentionally.

Accordingly, a card type smart key using a capacitive touch key has been proposed. The capacitive touch key has a mechanical design and its structure is very simple, which is advantageous over the mechanical switch in terms of design and manufacture. There is an advantage that a remote control device with high reliability can be provided because the fear of malfunction due to unwanted outside physical force is extremely low.

However, in the case of a smart key using a known capacitive touch key, problems are continuously being raised due to reactivity to liquid substances such as water. That is, when the smart key falls into the water or a water droplet is formed on the surface of the touch key, it is recognized that the user intends to perform the unintentional operation, or there is a problem in that the touch can not be recognized even if a normal touch is made in that state .

Furthermore, the technique of recognizing a user's intended operation with a touch basically consumes a lot of power. Therefore, the touch method has a disadvantage that the battery consumption is faster than that of the conventional mechanical type switch, and therefore, the maintenance cost required to maintain the battery must be changed at a fast cycle, compared with the mechanical type switch, and inconvenient for maintenance .

Korean Patent Application No. 10-2013-0117576 Korean Patent Application No. 10-2013-0154061

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a card type smart key and a control method of a capacitive touch type which can prevent a malfunction caused by misunderstanding of a normal touch by a user when a liquid material such as water touches the surface of a touch input part .

According to an aspect of the present invention,

A touch input unit formed on the PCB and configured to include a touch circuit pattern that recognizes a user's touch; a cover sheet that covers and protects the touch circuit pattern of the PCB and includes a function identification unit; And

And a control unit for determining whether or not a normal touch is made from a change in an output value of the sensors constituting the touch circuit pattern and generating and outputting a function execution command corresponding to the touch position based on the discriminated information,

In the touch circuit pattern of the PCB, the touch circuit pattern of the PCB is composed of electrodes constituting a self-capacitance sensor and a mutual-capacitance sensor,

The control unit determines whether the touch information recognized by the touch input unit from the output values of the capacitance sensors and the mutual capacitance sensors is an abnormal touch due to the normal touch or the contact of the liquid material intended by the user, And the function execution command corresponding to the touch position is not generated if it is determined as abnormal touch.

The cover sheet may be made of an opaque or translucent nonconductive resin material. The function identification means of the cover sheet may include a printed symbol image to visually provide function information or a pattern image Shaped forming protrusions or engraved molding grooves.

In addition, an adhesive may be formed between the PCB and the cover sheet by applying an adhesive to the upper surface of the PCB so that an air gap is not formed between the PCB and the cover sheet.

The control unit may determine that the touch is recognized in two or more touch recognition areas at the same time, and may restrict generation of a function execution command corresponding to the touch recognition area.

The control unit preferably includes a touch control unit having a capacitance determination unit for recognizing the touch position from the output values of the capacitance sensor and the mutual capacitance sensor and comparing the output value of the capacitance sensor and the capacitance sensor to determine the touch state, And a main control unit for generating and outputting a normal function execution command corresponding to the touch position recognized by the touch control unit based on the touch state determination information transmitted from the touch control unit or for restricting the generation of a normal function execution command have.

At this time, when the output values of the capacitance sensor and the mutual capacitance sensor increase at the same time, the capacitance discrimination unit discriminates a normal user's touch and transmits the discrimination information to the main control unit, and when the output value of the capacitance sensor increases When the output of the mutual capacitance sensor is decreased, it is possible to discriminate the abnormal touch caused by the contact of the liquid material and to transmit the discrimination information to the main control unit.

Further, the main control unit may include a low power control unit for performing control to maintain the touch control unit in a sleep mode until external vibration is sensed.

At this time, if the touch is not recognized for a predetermined period of time, the low-power control unit turns off the power supply to the touch control unit to switch the touch input unit to the sleep mode. In the sleep mode, And if it is sensed, control to switch the touch input unit to a touch-enabled enabled state (Wake up mode) by allowing power supply to the touch control unit.

More specifically, the low-power control unit switches to a sleep mode when there is no touch recognition for a predetermined time previously input to the internal timer, and immediately switches to a sleep mode when a predetermined time immediately after the touch recognition in the active state (Wake up mode) State (Sleep mode).

Here, the time determined by the internal timer may preferably be 1 to 3 seconds.

According to another aspect of the present invention as a solution to the problem,

(a) when an external vibration is sensed through the vibration sensor, allowing the touch control unit to supply power to turn the touch input unit into a touch-enabled enabled state (Wake up mode);

(b) determining whether a normal touch is made from a capacitance change of a touch input unit in an active state (Wake up mode);

(c) inhibiting normal function execution if it is determined that the touch is abnormal, generating and outputting a normal function execution command corresponding to the touch position if it is determined that the touch is normal; And

(d) immediately switching the device state to a sleep mode if an additional touch is not recognized for a predetermined time previously entered in the internal timer immediately after an abnormal touch recognition or immediately after recognizing a normal user touch, Type smart key of the smart card.

In the step (b), the output value of the capacitance sensor and the capacitance value of the mutual capacitance sensor may be compared to determine the touch state.

Preferably, when the output values of the capacitive sensor and the mutual capacitance sensor increase simultaneously, the discrimination is made as a normal user's touch. When the output value of the capacitance sensor increases and the output of the mutual capacitance sensor decreases below the reference value, It can be discriminated by abnormal touch due to contact.

In addition, when the output of the capacitance sensor is increased and the output of the mutual capacitance sensor is determined to be an abnormal touch, if the output of the mutual capacitance sensor again rises above the reference value by the user's touch, .

According to the card-type smart key and the control method of the capacitive touch method according to the embodiment of the present invention, when an unusual touch such as water or moisture comes into contact with an unusual touch such as a touch button surface, As shown in Fig. Therefore, it is possible to prevent the malfunction of the device due to the change of the capacitance due to the liquid material.

When the user touches the touch button even in the state where the liquid material is applied on the touch recognition area of the touch input unit, it can be determined that the touch is normally input to the touch recognition area without recognizing the adjacent touch recognition area. The adhesive layer is formed by the adhesive agent, so that stable touch sensitivity and waterproof function can be exhibited

In addition, if the touch is not recognized for a predetermined time immediately after the recognition of the touch, the touch sensor is automatically switched to the sleep mode, thereby extending the life of the battery. Thus, inconvenience associated with periodic battery replacement And the maintenance cost can be greatly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram schematically showing the entire configuration of a smart card of a capacitive touch type according to the present invention; FIG.
2 is a block diagram showing a preferred embodiment of the control unit of FIG.
3 is a schematic sectional view of a touch assembly formed by combining a cover sheet and a PCB constituting a touch input unit.
4 is a view showing a preferred example of a touch circuit pattern formed on a PCB for user touch recognition;
5 is a conceptual diagram for explaining a principle for discriminating a normal / abnormal touch from a capacitance change of a capacitance sensor and a mutual capacitance sensor;
Figure 6 illustrates a preferred control mode for power saving mode implementation;
7 is a control logic applied to a card-type smart key of a capacitive touch type according to the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

It is to be understood that the terms "comprises", "having", and the like in the specification are intended to specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Also, the terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms " part, "" unit," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software .

In the following description with reference to the accompanying drawings, the same reference numerals are given to the same constituent elements, and a duplicate description thereof will be omitted. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a block diagram schematically showing the overall configuration of a card-type smart key of a capacitive touch type according to the present invention, and FIG. 2 is a block diagram showing a preferred embodiment of the control unit of FIG. FIG. 3 is a schematic cross-sectional view of a touch assembly including a combination of a cover sheet and a PCB constituting a touch input unit, and FIG. 4 is a diagram illustrating a preferred example of a touch circuit pattern formed on a PCB for user touch recognition.

Referring first to FIG. 1, a card type smart key of a capacitive touch type according to an exemplary embodiment of the present invention is roughly composed of a capacitive touch input unit 10 and a control unit 20. The touch input unit 10 includes a touch circuit pattern 12 for recognizing a user's touch and the control unit 20 recognizes the touch from the capacitance change of the touch input unit 10 and outputs a function execution command corresponding to the touch position Output.

The touch input unit 10 includes a touch circuit pattern 12. The touch circuit pattern 12 may be formed in a predetermined pattern on the PCB 28 through etching. The touch circuit pattern 12 of the PCB 28 is covered and protected by a cover sheet 14 coupled to an upper portion of a lower case (not shown) on which the PCB 28 is mounted. The function identification means 140 is provided so as to be recognized by an intuition or touch.

The cover sheet 14 may be an opaque or translucent nonconductive resin material. The function identification means 140 of the cover sheet 14 may be a printed symbol image so as to intuitively recognize the function of each button. Of course, it may be a protrusion formed in a different pattern for each region or an indentation-shaped groove so that the user can directly recognize the function of the button by touching the button position with the touch of the user.

3, the PCB 28 and the cover sheet 14 on which the touch circuit pattern 12 is formed can be closely and tightly coupled with each other through a bonding agent without any gap. The adhesive layer 30 may be formed between the PCB 28 and the cover sheet 14 by an adhesive agent so that an air gap is not formed between the PCB 28 and the cover sheet 14. [ Accordingly, the touch sensitivity can be stably maintained and the waterproof function for preventing the water from penetrating to the PCB 28 can be exercised.

The touch circuit pattern 12 of the PCB 28 includes a plurality of electrodes 120, as illustrated in FIGS. The plurality of electrodes 120 may be specifically an electrode constituting a self-capacitance sensor 122 and an electrode constituting a mutual-capacitance sensor 124. The electrodes constituting the capacitance sensor 122 and the mutual capacitance sensor 124 may be configured to form two layers on the PCB as shown in FIG. 3 (a).

In this case, as shown in FIG. 4 (a), the electrodes constituting the capacitance sensor 122 may be provided in the form of a plurality of (preferably four) individual electrodes independent of each other on the surface (upper surface) side of the PCB 28 And the electrodes constituting the mutual capacitance sensor 124 can be arranged at a size enough to accommodate the electrodes constituting the capacitance sensor 122 below the electrodes constituting the capacitance sensor 122.

That is, as shown in FIG. 3A, in the case of the embodiment in which the electrode 120 for detecting the capacitance change is disposed so as to form two layers on and below the PCB, as shown in FIG. 4A, (The self sensing position in the drawing) and the peripheral portion thereof may be the sensing position (the mutual sensing position in the drawing) for detecting mutual capacitance change.

The electrodes constituting the capacitance sensor 122 and the mutual capacitance sensor 124 may also be configured as a single layer on the same plane of the PCB as shown in FIG. 3 (b). In this case, as shown in FIG. 4B, the electrodes constituting the capacitance sensor 122 may be provided in the form of a plurality of (preferably four) individual electrodes which are independent from each other, May be disposed at the rim of each of the capacitance sensors 122.

Of course, the pattern, arrangement and shape of the electrodes constituting the magnetic sensor 122 and the electrodes constituting the mutual capacitance sensor 124 may be changed as much as possible depending on the size, arrangement or arrangement of the function identification means 140 Therefore, the present invention is not limited to the shapes illustrated in Figs. 3 and 4.

The controller 20 recognizes the touch from the output value change of the sensors constituting the touch circuit pattern 12 and discriminates whether or not the touch is normal. And generates RF / LF signals for transmitting and receiving information according to the touch position, preferably, the RF / LF signals for transmitting and receiving information, and wirelessly transmitting the signals to the vehicle side through the wireless transceiver 50, Feedback is given to the results.

The controller 20 determines whether the touch information recognized by the touch input unit 10 from a change in the output values of the capacitance sensors 122 and the mutual capacitance sensors 124 is a normal touch It is determined whether the touch is an abnormal touch due to the contact of the liquid substance such as the perceived product. If the abnormal touch is detected, the generation of the function execution command corresponding to the touch position is restricted.

The control unit 20 preferably includes a touch control unit 22 provided with a capacitance determination unit 23. [ And a main control unit 24 for controlling the overall function of the device. The capacitance determination unit 23 determines the touch state by comparing the output values of the capacitance sensor 122 and the mutual capacitance sensor 124 (determines whether the touch is normal or abnormal), and the main control unit 24 recognizes The function execution command is generated.

The physical quantity (capacitance change value) input from the touch circuit pattern 12 due to the change in capacitance at the time of touch detection is converted into a digital value in the form of a voltage through an AD converter (Analog Digital Converter) 21, 22, and when it is determined that the touch is an abnormal touch, the main control unit 24 executes control for restricting the generation of a subsequent operation, preferably a normal function execution command.

The touch control unit 22 recognizes the position of the output of the capacitance sensor 122 and the capacitance sensor 124 when the touch is input through the touch input unit 10 and recognizes the touch position, To the main control unit (24). Then, the main control unit 24 outputs the corresponding function execution command from the touch position information sent from the touch control unit 22. [ At this time, the function execution command may be recorded in advance as a voltage-type signal to the control unit corresponding to each touch position.

The capacitance determination unit 23 compares the output values of the capacitance sensor 122 and the capacitance sensor 124 when detecting the capacitance change, and determines whether the touch is normal or abnormal based on the comparison result. Preferably, when the signals of the capacitance sensor 122 and the capacitance sensor 124 are outputted in the same direction, it is determined as a normal user's touch. If the directions of the two output values are different from each other, do.

More specifically, when the output values of the capacitance sensor 122 and the mutual capacitance sensor 124 increase simultaneously according to the touch recognition, the discrimination information is discriminated as a normal user's touch and the corresponding discrimination information is transmitted to the main control unit 24, When the output of the capacitance sensor 124 decreases, the output value of the capacitance sensor 122 increases. In this case, the output of the capacitance sensor 124 is determined as an abnormal touch due to the contact of the liquid material such as water and the corresponding determination information is transmitted to the main controller 24.

 The normal / abnormal touch discrimination principle performed by the capacitance discrimination unit will be described with reference to FIG.

5 is a conceptual diagram for explaining the principle of discriminating a normal / abnormal touch from a capacitance change of a capacitance sensor and a mutual capacitance sensor.

5, when the user touches the touch input unit 10 with a finger, the output value (self capacitance value) of the capacitance sensor 122 and the capacitance value of the mutual capacitance sensor 124 are determined by the general driving principle of the capacitance sensor. The output value (mutual capacitance value) is output in a direction increasing from the initial setting reference value. Therefore, if both of the values are increased, it can be set to recognize as a normal touch by the user's intention.

On the other hand, when a liquid substance such as water is contacted, the self capacitance value increases in a direction higher than the setting reference value, while the mutual capacitance value decreases in a direction lower than the setting reference value. This is because there is a difference between the case where the liquid material is touched and the case where the touch is made by the person. If the two output values are different from each other, this can be regarded as an unintended abnormal touch.

When the user touches the two output values in different directions due to the contact of the liquid material, the value of the self capacitance value of the capacitance sensor 122 and the output value of the mutual capacitance sensor 124 Value) is output in a direction increasing from the initial setting reference value, so that in this case, it is also recognized as a normal intended touch of the user.

That is, the electrostatic capacity determination unit 23 according to the present invention is configured to determine the electrostatic capacity of the electrostatic capacitance sensor 122 based on the combination of the self capacitance value of the capacitance sensor 122 and the mutual capacitance value of the capacitance sensor 124, It is possible to distinguish the normal touch or the unintended abnormal touch which is intended for the touch operation or the normal touch operation in the unintended abnormal touch state.

As a matter of course, there may be a case where it is difficult to output a function execution command corresponding to the touch position, for example, when a touch is simultaneously recognized in two or more touch recognition areas. Therefore, when two or more touch recognition areas are simultaneously touched, it is possible to determine that the operation is wrong or unintentional operation so that the function execution command corresponding to the corresponding touch recognition area is not outputted.

Referring back to Figs. 1 and 2, the main control unit 24 applied to the embodiment of the present invention includes a low-power control unit 25. Fig. The low power control unit 25 controls the power of the smart key according to the embodiment of the present invention. More specifically, the main function is to maintain the device in a sleep mode until external vibration is detected, thereby minimizing power consumption and extending the life of a battery (not shown).

Preferably, when the touch is not recognized for a predetermined time previously input to the device during operation in a touch recognition standby state (scan mode) capable of recognizing the touch, the low power control unit 25 supplies power to the touch control unit 22 May be performed. As a result, the touch input unit 10 is switched to the sleep mode, so that the device can be operated in the power saving mode in the low power state.

The low power control unit 25 can be set to allow power supply to the touch control unit 22 only when external vibration is detected through the vibration sensor 70 built in the device in the sleep mode. That is, the touch input unit 10 can be set to switch to a wake up mode in which only the external vibration is detected. At this time, the vibration sensor may include any known type such as an acceleration sensor or a gyro sensor.

6 is a diagram illustrating a preferred control scheme for power saving mode implementation.

6, the low-power control unit 25 switches the device to the sleep mode if there is no touch recognition during the predetermined time t entered in advance in the internal timer 40, The device may be set to immediately switch back to the sleep mode to minimize power consumption when the predetermined time t elapses immediately after the touch recognition in the sleep mode.

The time determined by the internal timer 40 may preferably be 1 to 3 seconds. However, the present invention is not limited to this, and may include a control algorithm for changing the predetermined time t according to the remaining amount of the battery. For example, if the remaining battery level falls below 20%, the predetermined time t may be shortened to within 1 second in the conventional 2 seconds.

Hereinafter, overall control including touch recognition and normal / abnormal touch discrimination performed by the card type smart key of the capacitive touch type according to the present invention will be described in connection with the operation of the present invention.

FIG. 7 is a control logic applied to control the card-type smart key of the capacitive touch method according to the present invention. When the touch input unit 10 detects an external vibration, it switches to a wake up mode Will be described as an example.

Referring to FIG. 7 and FIG. 2 together with FIG. 2, when the vibration sensor senses external vibration, the low power control unit 25 allows power supply to the touch control unit 22, (Wake up mode) ( S10 ). In this state (Wake up mode), a change in self capacitance and mutual capacitance is detected simultaneously with the external touch input (S20).

A process of determining whether or not a normal touch is made is performed from the capacitance change detected by the capacitance determination unit 23 of the touch control unit 22 (S30). Preferably, when the output values of the capacitance sensor 122 and the capacitance sensor 124 increase simultaneously, the capacitance value of the capacitive sensor 122 is determined as a normal user's touch, the output value of the capacitance sensor 122 increases, Is judged to be an abnormal touch due to the contact of the liquid material.

If it is determined in step S30 that the touch input to the touch input unit 10 is an abnormal touch, for example, touch by liquid material contact, as a result of the normal touch determination by the capacitance determination unit 23, normal function execution is prohibited, If it is determined that the touch is detected, the corresponding touch is recognized and a normal function execution command corresponding to the touch position is generated and output (S40).

On the other hand, if an additional touch is not recognized immediately after the abnormal touch recognition or immediately after the recognition of the normal user touch during the predetermined time (t) inputted in the internal timer 40 in advance, control is performed to switch the device state to the sleep mode immediately (S50). When an additional touch is input, the process returns to step S20 described above, and the capacitance change detection and normal touch determination (S30) and the subsequent control (S40) are repeated.

On the other hand, although not included in the control logic of FIG. 7, in a state in which an abnormal touch is determined by the contact of the liquid material (the output value of the capacitance sensor 122 increases and the output of the capacitance sensor 124 decreases) When the output of the mutual capacitance sensor 124 rises above the reference value again by the touch of the user, the control logic may be configured to recognize it as a normal user touch and execute the subsequent control (function execution command output).

In addition, when the touch input through the touch input unit 10 is continued for a predetermined time or more, a function of forcibly entering a sleep mode may be added to reduce power consumption due to the touch search. This can be implemented by configuring the control logic to count the time from when the capacitance change is detected to automatically go to the sleep mode when the preset time is exceeded.

According to the above-described card-type smart key of the capacitive touch method according to the embodiment of the present invention, when an unusual touch such as water or moisture comes into contact with an unusual touch such as a touch button surface of a user, It has a function that can be distinguished. Therefore, it is possible to prevent the malfunction of the device due to the change of the capacitance due to the liquid material.

When the user touches the touch button even in the state where the liquid material is applied on the touch recognition area of the touch input unit, it can be determined that the touch is normally input to the touch recognition area without recognizing the adjacent touch recognition area. The adhesive layer is formed by the adhesive agent, so that stable touch sensitivity and waterproof function can be exhibited

In addition, if the touch is not recognized for a predetermined time immediately after the recognition of the touch, the touch sensor is automatically switched to the sleep mode, thereby extending the life of the battery. Thus, inconvenience associated with periodic battery replacement And the maintenance cost can be greatly reduced.

In the foregoing detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

10: touch input section 12: touch circuit pattern
14: cover sheet 20:
21: AD converter 22: Touch control unit
23: electrostatic capacity discrimination unit 24: main control unit
25: low power control unit 28: PCB
30: adhesive layer 40: timer
50: wireless transceiver 120: electrode
122: magnetic capacity sensor 124: mutual capacity sensor
140: Function identification means

Claims (13)

A touch circuit pattern 12 formed on the surface of the PCB 28 and recognizing the user's touch; a cover sheet (not shown) covering the touch circuit pattern 12 of the PCB 28 and having function identification means 140 14; And
And a control unit (20) for discriminating whether or not a normal touch is made from a change in output value of the sensors constituting the touch circuit pattern (12), and for generating and outputting a function execution command corresponding to the touch position on the basis of the discriminated information ,
The touch circuit pattern 12 of the PCB 28 is composed of the electrodes 120 constituting a self-capacitance sensor 122 and a mutual-capacitance sensor 124,
The control unit 20 determines whether the touch information recognized by the touch input unit 10 from a change in the output values of the capacitance sensors 122 and the mutual capacitance sensors 124 is a normal touch intended by the user If it is determined that the touch is an abnormal touch and an erroneous touch due to the contact of the liquid material is detected or if a touch is recognized in two or more touch recognition areas at the same time, it is determined that the operation is an erroneous operation or an unintended operation, Wherein the card-type smart key of the electrostatic capacity touch type is not generated.
The method according to claim 1,
The cover sheet 14 is made of an opaque or translucent nonconductive resin material,
The function identification means 140 of the cover sheet 14 is one of embossed molding projections or engraved molding grooves formed in patterns different from one another for each touch region so as to feel a printed symbol image or hand feeling to visually provide function information ,
An adhesive is applied between the PCB 28 and the cover sheet 14 so that an air gap is not formed between the PCB 28 and the cover sheet 14 to form an adhesive layer 30 between the PCB 28 and the cover sheet 14. [ Wherein the card-type smart key is a capacitive touch type smart card.
delete The method according to claim 1,
The control unit (20)
The touch position is recognized from the output values of the magnetic capacity sensor 122 and the mutual capacitance sensor 124 and at the same time the output values of the capacitance sensor 122 and the mutual capacitance sensor 124 are compared to determine the touch state A touch control unit (22) having a part (23);
Generates and outputs a normal function execution command corresponding to the touch position recognized by the touch control unit 22 based on the touch state determination information transmitted from the touch control unit 22 or restricts generation of a normal function execution command And a main control unit (24).
5. The method of claim 4,
The capacitance determination unit (23)
When the output values of the capacitance sensor 122 and the mutual capacitance sensor 124 are increased at the same time, it is determined that the touch is a normal user's touch and the corresponding discrimination information is transmitted to the main control unit 24,
When the output value of the magnetic capacity sensor 122 is increased and the output of the mutual capacitance sensor 124 is decreased, it is determined that the touch is abnormal due to the contact of the liquid material and the corresponding determination information is transmitted to the main control unit 24 A capacitive touch card type smart key.
5. The method of claim 4,
The main control unit (24)
And a low power control unit (25) for performing control to maintain the touch control unit (22) in a sleep mode until external vibration is detected.
The method according to claim 6,
The low power control unit (25)
If the touch is not recognized for a predetermined time, the power supply to the touch control unit 22 is interrupted to switch the touch input unit 10 to the sleep mode,
When the external vibration is detected through the vibration sensor in the sleep mode, the power supply to the touch control unit 22 is allowed and the touch input unit 10 is switched to a wake up mode in which the touch input is possible Smart smart card with capacitive touch.
8. The method of claim 7,
The low power control unit (25)
If there is no touch recognition for a predetermined period of time previously input to the internal timer 40, it is switched to a sleep mode,
When the predetermined time elapses immediately after the touch recognition in the active state (Wake up mode), the sleep mode is immediately switched to the sleep mode.
9. The method of claim 8,
Wherein the time determined by the internal timer (40) is 1 to 3 seconds.
(a) when an external vibration is sensed through the vibration sensor, allowing the touch control unit to supply power to turn the touch input unit into a touch-enabled enabled state (Wake up mode);
(b) determining whether a normal touch is made from a capacitance change of a touch input unit in an active state (Wake up mode);
(c) inhibiting normal function execution if it is determined that the touch is abnormal, generating and outputting a normal function execution command corresponding to the touch position if it is determined that the touch is normal; And
(d) immediately switching the device state to a sleep mode if an additional touch is not recognized for a predetermined time previously entered in the internal timer immediately after the abnormal touch recognition or immediately after recognizing the normal user touch, Wherein the smart card is a smart card.
11. The method of claim 10,
The method of claim 1, wherein the step (b) comprises comparing the output values of the capacitive sensor and the capacitive sensor to determine a touch state.
12. The method of claim 11,
When the output values of the capacitance sensor and the mutual capacitance sensor are increased simultaneously,
Wherein the output value of the magnetic capacity sensor is increased and the output of the mutual capacitance sensor is decreased to be less than the reference value, the discrimination is made as an abnormal touch due to the contact of the liquid material.
13. The method of claim 12,
When the output of the capacitance sensor is increased and the output of the capacitance sensor is determined to be an abnormal touch, when the output of the mutual capacitance sensor again rises above the reference value by the user's touch, the capacitance recognized by the touch of the normal user A method of controlling a card type smart key of a touch type.

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