JPH04349322A - Reset operation type flashing switch - Google Patents

Abstract

PURPOSE:To prevent touch malfunction of a detection circuit even where a touch detection signal becomes small as in the vicinity of a surface heating carpet, in a discharge lamp lighting circuit which detects a human body touching the electrode of a touch switch and lights the discharge lamp. CONSTITUTION:Under a conductive touch plate A, conductive structures B, C are provided. The touch plate A and the structures B, C are connected to external terminals F and G, H. A flashing switch is fitted with contact (g, h) installed on the external terminals G, H respectively.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a reset operation blinking switch used in the human body touch part of a touch signal detection circuit for lighting a discharge lamp lighting circuit by detecting the state of touch with the human body. It is.

0002

[Prior Art] Conventionally, a touch board used in a touch signal detection circuit for operating a load circuit of a discharge lamp lighting circuit by detecting the state of touch with the human body is used to transmit touch signals from the human body. The electrode plate is made of a long and thin plate-like metal piece. There is a commercial voltage induction method as one of the detection methods of the touch signal detection circuit, and the principle of this method will be explained with reference to the discharge lamp lighting circuit shown in FIG. 4.

[0003] When using a commercial power supply with one line grounded to the earth, such as a general household power supply, and the polarity is as shown in the diagram,
The potential on the circuit grounding line GND when viewed from the earth is shown in Figure 5.
Since the potential is low as shown in the figure, the touch plate A
When the human body M touches, the voltage is transferred via the impedance of the human body M to the positive side of the commercial power supply → the human body M → the touch plate A → the resistor R2 →
Resistor R1 → Circuit grounding wire GND → Rectifier diode D1
→A path is formed on the negative side of the commercial power supply, and a current flows through that path every half cycle of the commercial frequency. The voltage drop VR1 due to the resistance R1 due to this current is the threshold voltage VT of the signal detection IC of the touch signal processing circuit
If it becomes larger than H, the output of the signal detection IC changes from a high value to a low value, and it is detected that the human body M has touched the touch plate A. Then, the blinking signal of this circuit operates the start switch of inverter Y, and that inverter Y
generates a high frequency voltage and lights the lamp L. Note that the capacitor C1 in FIG. 4 is a capacitor for preventing touch signal malfunction due to high frequency noise.

0004

[Problems to be Solved by the Invention] In a conventional discharge lamp lighting circuit having a commercial voltage induction type touch signal detection circuit as described above, when connected to a commercial power supply via an isolation transformer, the power supply section is connected to the ground. As a result, the current path described above is cut off, and the touch signal current no longer flows.Therefore, the lamp in the discharge lamp lighting circuit does not light up because touch cannot be detected. .

[0005] Furthermore, when surface heating is performed by energizing a film heater from a commercial power source without going through an isolation transformer, the touch signal current becomes extremely small in the vicinity of a surface heating carpet and cannot be detected. This may cause the heating carpet to not operate. This phenomenon will be explained with reference to FIG. Since the potential of the human body is equal to the ground voltage under normal conditions, the maximum voltage E is on the high voltage side of 140 volts in the half cycle of the solid line shown in Figure 6 with respect to the circuit grounding line GND. However, the area around the surface heating carpet is covered with a heating element through which commercial current flows, creating a special potential environment where commercial voltage is induced. Therefore, a human body in the same environment will also be charged with a commercial voltage of the same phase, and as shown in Figure 6, the potential of the circuit grounding line GND E as seen from the potential of the human body.
1 becomes less than the maximum voltage of 140 volts. Therefore, the touch signal current of the human body becomes smaller and the voltage drop VR1 also becomes smaller, and the detection IC of the touch signal detection circuit
If VR1<VTH with respect to the threshold voltage VTH, the touch signal current will not be detected, resulting in problems such as a touch inoperable state.

[0006] In view of the above-mentioned problems, the present invention detects the touch of a human body to the touch panel and activates the discharge lamp lighting circuit by detecting touch detection signals such as those around a surface heating carpet. It is an object of the present invention to provide a return operation type blinking switch that detects the signal even in a place where the signal becomes small and prevents a detection circuit from becoming touch inoperable.

[0007]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the return operation type blinking switch according to the present invention comprises an operation pressing part of the switch made of a conductive material and a touch plate electrode that is touched by the human body. This is what I did.

[0008]

[Embodiment] A case where the return operation type blinking switch according to the present invention is used in an actual discharge lamp lighting circuit will be explained with reference to FIG. Even if the human body M touches the metal touch plate A, the touch signal current is small and the touch signal cannot be detected even in special environments (for example, around a surface heating carpet, a place where the power source is isolated from the ground, etc.). , regardless of its location, if the touch signal input section is raised to the power supply voltage Vcc of the touch signal detection IC via the resistor R2, in other words, if the values of the resistors R1 and R2 are appropriately selected, the touch signal Voltage VR1>IC threshold voltage VT
A current of H2 will flow, and a touch signal will be detected. That is, the switch SW in the circuit diagram of FIG. 3 may be turned on momentarily.

The structure of the reset operation type blinking switch according to the present invention will be explained with reference to FIGS. 1 and 2. A is a conductive touch plate, which is electrically connected to a terminal F by a lead wire via similarly conductive structures B and C installed at the bottom of the touch plate A. Also, like the terminal F, the terminals G and H are externally fixed to the E, and the respective contacts g and h are arranged in close proximity to each other at the tips of the terminals G and H. Terminal F is connected to point a (touch plate A) in FIG. 3, terminal G is connected to point b in FIG. 3, and terminal H is connected to point B in FIG.
are connected to point c, respectively.

[0010] Regarding the operating state, in normal use, when the human body M touches the touch plate A, the touch signal flow is as follows: commercial power supply positive side → earth → human body M → touch plate A →
Structure B, C and lead wire → terminal F → lead wire → point a →
A current flows through the path of resistor R2 → resistor R1 → diode D1 → commercial power supply on the negative side, and a touch signal detection operation is performed.

[0011] In special environments where the touch signal current is small and touch signal detection is impossible, such as when a human body M touches the touch plate A in a place such as around a surface heating carpet, the touch plate A is When pressed once, as shown in FIGS. 1 and 2, the insulator D fixed to the lower surface of the conductive structure C presses the tip of the terminal H.
The H contacts g and h are momentarily in contact. That is, in FIG. 3, since the contacts b and c are momentarily brought into contact, a current momentarily flows into the circuit GND by the control power supply Vcc of the touch signal processing circuit X, and a signal voltage VR1 is generated. This signal voltage VR1 is applied to the signal detection IC of the touch signal processing circuit
Since the threshold voltage VTH is set higher than the threshold voltage VTH, the output of this signal detection IC changes from a high state to a low state, and the same operation as the touch signal detection operation can be obtained.

Although a push switch is used in the above embodiment, the operation part thereof is made of a conductive material and used as a touch plate, which is connected to point a in FIG. The terminals may be connected to points b and c in FIG.

[0013]

Effects of the Invention As described above, the return operation type blinking switch according to the present invention allows the lower part of the conductive touch plate serving as the switch operation part to be connected to the lower part of the conductive touch plate through the conductive structure attached to the lower part. It is electrically connected to an external terminal fixed to the outer shell, and the tips of the other two external terminals fixed to the outer shell have their respective contacts disposed close to each other and facing each other. The switch operation unit itself, which operates on and off when pressed or released, is a touch board that operates when touched by the human body, and even in environments where touch detection is impossible, it always maintains a constant level regardless of the size of the touch detection signal. This has the effect that a signal voltage can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional front view of a reset operation type flashing switch according to the present invention in a contact open state.

FIG. 2 is a cross-sectional front view of the reset-operated flashing switch according to the present invention in a contact closed state.

FIG. 3 is a circuit diagram of a discharge lamp lighting circuit using the return operation type blinking switch according to the present invention.

FIG. 4 is a circuit diagram of a discharge lamp lighting circuit that blinks in response to a touch signal.

FIG. 5 is a waveform diagram of a discharge lamp lighting circuit when operated by commercial power supply.

FIG. 6 is a waveform diagram illustrating a phenomenon in which the touch signal current becomes extremely small and undetectable, causing the discharge lamp lighting circuit to become inoperable.

[Explanation of symbols]

A Touch board B Structure C Structure D　Insulator E Outside writing F External terminal G External terminal H External terminal G Contact h Contact

Claims (1)

[Claims] 1. A lower part of a conductive touch plate serving as a switch operation part is electrically connected to an external terminal fixed to the outside via a conductive structure attached to the lower part, and A return operation blinking switch characterized in that the other two external terminals fixed to the outer shell have contacts disposed close to each other so as to face each other at the tips of the other two external terminals.