KR100859318B1 - Two-stage switch using capacitance sensor and mechanical contactor switch - Google Patents

Abstract

The present invention relates to a two-stage switch in which a capacitive sensor and a mechanical contact switch are combined to input two inputs to a single switch. The contact of the capacitive sensor operates to visualize the function of the mechanical contact switch. The mechanical contact switch operates when audibly informed and pressure is applied. According to the present invention, since the switch can accept two inputs at one point, the same function can be performed with a smaller area and the number of buttons, thereby reducing the size of the keypad. Since the function can be known audibly or visually in advance, there is an advantage in that the key can be conveniently used when a person who has difficulty in vision or when the field of view needs to be fixed and the switch is operated (for example, while driving).

2-stage switch, dome switch, capacitive sensor, mechanical contact switch, time division

Description

Two-stage switch using capacitance sensor and mechanical contactor switch}

1 is a view for explaining a two-stage switch according to the present invention;

2 to 4 illustrate an application example of the two-stage switch of FIG. 1;

5 is a view for explaining a two-stage switch according to the present invention for a dome switch;

6 is a circuit diagram of the timing controller 170 of FIG. 5.

7 is a timing diagram of FIG. 6;

FIG. 8 is a timing diagram according to a contact point of the conductive domed pressure plate 140 of FIG. 5;

FIG. 9 is a timing diagram according to a pressing time of the conductive domed pressure plate 140 of FIG. 5.

<Description of reference numbers for the main parts of the drawings>

10: detection terminal of the capacitive sensor

20: mechanical contact switch

110: case 120: light guide plate

130: switch fixing plate 140: conductive dome type pressure plate

150a, 150b: PCB pattern 160: PCB substrate

170: timing controller 180: capacitive sensor

The present invention relates to a two-stage switch, and more particularly, to a two-stage switch using a capacitive sensor and a mechanical contact type switch together.

Conventional mechanical contact switches or capacitive sensors cannot accept only one input at a single point, and thus cannot be used multifunctionally. If two inputs can be made to a single switch, a keypad capable of performing the same function as a conventional method can be obtained with a small number of buttons. As described below, when a person who has difficulty in sight or a field of vision needs to be fixed and the switch is operated. It will also be very convenient (e.g. while driving).

An object of the present invention is to provide a two-stage switch capable of accepting two inputs at one point.

The two-stage switch according to an embodiment of the present invention for achieving the above technical problem, the capacitive sensor and the mechanical contact switch is characterized in that the two inputs to one switch.

At this time, it is preferable that the capacitive sensor operates by contact to visually or audibly inform the function of the mechanical contact switch, and to operate the mechanical contact switch when pressure is applied.

Two-stage switch according to another embodiment of the present invention for achieving the above technical problem, a PCB substrate; A conductive dome press plate installed on the PCB substrate; A first conductive PCB pattern interposed between the PCB substrate and the conductive domed pressure plate; A second conductive PCB pattern installed on the PCB substrate such that the conductive domed pressure plate is in a floating position; A capacitive sensor connected to the first conductive PCB pattern through a capacitive sensor sensing line; A dome switch output line connected to the first conductive PCB pattern; And a timing controller configured to time-division the dome switch output line and the capacitive sensor sensing line.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited to these examples.

1 is a view for explaining a two-stage switch according to the present invention. Referring to FIG. 1, in the present invention, a sensing terminal 10 of a capacitive sensor is positioned on a conventional mechanical contact type switch 20. Then, two switches can be recognized in one switch, namely, capacitive sensor recognition by contact and mechanical contact type switch recognition by pressure. The capacitive sensor is not shown.

The advantage of the present invention is that since two inputs can be made to one input key as shown in Fig. 2, the same function as the conventional method can be performed with a small area and the number of buttons, thereby reducing the size of the keypad.

And, when the contact is made to the sensing terminal 10 of the capacitive sensor, as shown in Figure 3 if the sound or sound to inform the function of the switch, if you are uncomfortable eyesight, if you need to fix the field of view and operate the switch ( (E.g. car driver), the key operation is convenient. That is, when a contact is made to the capacitive sensor detection terminal 10 of the two-stage switch, the function of the switch is notified by a voice signal or a sound, and the user hears it and applies pressure to the switch to switch the mechanical contact type switch 20. When operated, it is possible to listen to and operate the function of the switch as a sound even in the case of a person with an uncomfortable vision or when the switch should be operated without seeing the switch.

In addition, when contact is made to the capacitive sensor detecting terminal 10, as shown in FIG. 4, if the function of the switch is notified to the LED or other light emitting device, the key operation may be convenient when the switch must be operated in a dark environment.

5 is a view for explaining a two-stage switch according to the present invention for the dome switch. Referring to FIG. 5, conductive PCB patterns 150a and 150b are formed on the PCB substrate 160, and the first PCB pattern 150a is disposed between the contact of the conductive domed press plate 140 and the PCB substrate 160. The second PCB pattern 150b is interposed therebetween and is positioned where the conductive domed pressure plate 140 is excited. The switch fixing plate 130 is covered on the conductive domed pressure plate 140. The light guide plate 120 and the case 110 are installed on the switch fixing plate 130.

The conductive dome type pressing plate 140 serves as a pressing plate of the dome switch and also serves as a sensing terminal of the capacitive sensor 180. That is, when the user contacts the case 110, an electrical signal is inputted to the capacitive sensor 180 through the conductive dome-type press plate 140, the first PCB pattern 150a, and the capacitive sensor detection line H. The capacitive sensor 180 operates.

When a larger force, that is, a pressure is applied after the contact of the conductive domed pressure plate 140, the conductive domed pressure plate 140 is in contact with the second PCB pattern 150b, thereby making the dome switch output line G and the dome switch input line ( K) is connected to each other to operate the dome switch.

Since the conductive dome type pressing plate 140 is used as a sensing terminal of the capacitive sensor 180, the dome switch output line G and the capacitive sensor sensing line H should be used by time division. In this time division, the dome switch output line (G) and the capacitive sensor detection line (H) have their respective signals when enabled, and high impedance when disabled. Should be

6 is a circuit diagram of the timing controller 170 of FIG. 5. Referring to FIG. 6, the capacitive sensor output line I outputs low when a contact is made to the conductive domed pressure plate 140, and the dome switch output line G is connected to the conductive dome type pressure plate 140. When pressed, the second PCB pattern 150b and the first PCB pattern 150a are connected to each other to output a low.

7 is a time diagram of FIG. 6. In this case, when the LF is high, the capacitive sensor operates in correspondence to the section Y, and when the LF is low, the dome switch operates as the section Z.

When LF is high (capacitive sensor operating section), the capacitive sensor enable line (J) becomes high (high), so that the detection signal from the dome switch output line (G) and the capacitive sensor detection line (H) Occurs. At this time, since LF is high, FF is input to the clock of U2B by the AND gate of U3B so that the output of the capacitive sensor output line I passes through the U2B capacitive sensor final output line M. The first terminal of the AND gate of U3A is input low and no clock is input to the U2A side to maintain the previous output value (output L of Z section).

When LF is low, the capacitive sensor enable line J becomes low to detect the signal at the dome switch output line G and the sensing line H of the capacitive sensor. Does not occur. At this time, high is input to the base of Q1 TR and Q1 is turned on, so a pull-up is applied to VCC, and high is input to D of U2A. That is, when the second PCB pattern 150b and the first PCB pattern 150a are pressed by pressing the conductive dome type press plate 140, the dome switch input line K and the dome switch output line G are connected to each other, and thus, low to D of U2A. When (GND) is input and the conductive domed pressure plate 140 is not pressed, high is input to D of the U2A. At this time, U2B does not receive a clock, and maintains the previous output value (output M of the Y section), and only the clock of U2A is input, so that the output of the dome switch output line G becomes the switch final output line ( L) is output.

As described above, if the LF is repetitively high and low, the dome switch and the capacitive sensor are repeatedly operated to share the conductive dome type pressing plate 140. It is preferable to set the operation period shorter than the contact period of a person, and the duty can be arbitrarily set.

8 is a timing diagram according to a contact point of the conductive domed pressure plate 140. Referring to FIG. 8, when the contact point of the conductive domed pressure plate 140 is the capacitance sensor operation section, that is, the Y section, the capacitance sensor output line I becomes low at the contact point, and the capacitance After the sensor output line I becomes low, when the clock of U2B is the next high edge, the capacitive sensor final output line M becomes low.

When the contact point of the conductive dome type pressure plate 140 is the dome switch operation section, that is, the Z section, the output of the capacitive sensor output line I is generated in the next capacitive sensor operation section, and the capacitive sensor final output line ( M) shows that the capacitive sensor final output line M becomes low when the clock of the U2B is high edge after the capacitance sensor output line I is low.

9 is a timing diagram according to a pressing time point of the conductive domed pressure plate 140. Referring to FIG. 9, the contact should be made before the conductive domed pressure plate 140 is pressed, so the capacitive sensor output line I and the capacitive sensor final output line M are low.

If the pressing point of the conductive domed pressure plate 140 is the operating section of the capacitive sensor, that is, the Y section, the clock of U2A of the next switch operating section is at the high edge of the dome switch final output line (L). This becomes low. In addition, when the conductive dome type pressing plate 140 is pressed, the dome switch input line (GND, K), the dome switch output line (G), and the capacitance sensing line (H) is connected to the output of the capacitance sensor detection line (H) is low ( low).

When the pressing point of the conductive dome type pressing plate 140 is the dome switch operation section, that is, the Z section, the clock of U2A becomes the next high edge after the dome switch output line G becomes low. At the high edge, the dome switch final output line M becomes low.

As described above, according to the present invention, since the switch can accept two inputs at one point, it is possible to perform the same function as the conventional method with a small area and the number of buttons, thereby reducing the size of the keypad. Since the function of the switch can be known audibly or visually in advance, it is convenient to operate the key in people who have difficulty in vision or when fixing the field of vision and operating the switch (for example, while driving). There is this.

Claims (4)

delete delete Board; A conductive domed pressure plate installed on the substrate; A first conductive pattern interposed between the substrate and the contact of the conductive domed pressure plate; A second conductive pattern disposed on the substrate such that the conductive dome-type pressing plate is in a floating position; A capacitive sensor connected to the first conductive pattern through a capacitive sensor sensing line; A dome switch output line connected to the first conductive pattern; And And a timing controller for time-dividing the dome switch output line and the capacitive sensor sensing line. When a contact of a human body or the like occurs on the conductive dome type pressing plate, the capacitive switch by the capacitive sensor is operated, and the conductive And a mechanical contact switch is operated when a pressure is applied to the dome-type press plate and the conductive dome-type press plate is in contact with the second conductive pattern. 4. A two-stage switch according to claim 3, wherein said capacitive switch visually or audibly informs the function of said mechanical contact switch.

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