JPH0351773A - Electrostatic discharge display apparatus - Google Patents

Abstract

PURPOSE:To easily confirm the discharge of static electricity by a user by displaying that static electricity is discharged by a discharge display means on the basis of the detection signal of a discharge detection means. CONSTITUTION:When a touch button 2 is pushed when a human body is charged in a car, a condenser 8c is charged and, thereafter, discharged voltage is applied to resistors 9b, 9c and comparators 9g, 9h. When static electricity is positive, an H-level signal is outputted when the voltage exceeds the reference potential Vr1 of the comparator 9g and, when static electricity is negative, the comparator 9h outputs an H-level signal. Therefore the input of an OR circuit 9i becomes an H-level in both cases and the output thereof is applied to a differentiation circuit 12 and an RSFF 14. Therefore, the output of an output terminal Q becomes an H-level and 'Static Electricity Charged has been discharged' is displayed by a display lamp 6.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention prevents the shock felt when static electricity charged on the human body is discharged to a conductive part, and in particular can display that the static electricity has been discharged. The present invention relates to an electrostatic discharge display device.

[Conventional technology]

Generally, static electricity is generated by friction between two insulators, and when the two insulators separate, it is discharged to a conductor that is in contact with the insulator.

For example, in a car, static electricity is generated when seats and clothing rub against each other while driving. Then, when the seat and clothing are separated when exiting the vehicle, the human body becomes electrically charged. If you touch an exposed metal part, such as a door or car body, while still charged, you will feel a shock as the static electricity charged in your body is discharged.

Therefore, in order to prevent such shocks, various electrostatic shock prevention devices have been proposed that can discharge the static electricity that is charged on the human body by touching the passenger's hand when exiting the vehicle without feeling a shock. ing.

In addition, in a device where the operation knob is operated with a finger, a conductive film is attached to the display panel of the cabinet, and a conductive film is attached to the display panel of the cabinet, as disclosed in Japanese Utility Model Application Publication No. 61-139600. There is also known an electrostatic damage prevention device that discharges static electricity by connecting a ground point to the operating knob and guiding the static electricity generated on the operating knob to the ground point.

[Problem to be solved by the invention]

All of the conventional devices mentioned above lead to a full discharge of static electricity on the human body in an attempt to eliminate the shock caused by the discharge, but they do not display whether or not the static electricity has actually been discharged. However, there was a problem in that the user was left with a sense of uneasiness because the discharge was still occurring reliably and the user could not confirm what was going to happen next.

This invention was made in order to solve the above-mentioned problems, and it is possible to ensure that the static electricity charged on the human body is discharged to a conductive part, thereby preventing a shock when it is discharged, and also clearly indicating that the static electricity has been discharged. It is an object of the present invention to provide an electrostatic discharge display device that can display images and relieve a user's anxiety.

[Means to solve the problem]

The electrostatic discharge display device according to the present invention includes a discharge means for discharging static electricity, a discharge detection means for detecting that the discharge means has discharged static electricity and outputting a detection signal, and a discharge detection means for detecting static electricity based on the detection signal of the discharge detection means. The device is equipped with a discharge display means for indicating that discharge has occurred.

[Effect]

In this invention, when a charged user touches the discharge means, the static electricity is discharged, the discharge detection means outputs a detection signal, the discharge display means displays that the static electricity has been discharged, and the user This is to confirm that the static electricity has been discharged.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
Both FIG. 1 and FIG. 2 show the embodiment, with FIG. 1 being an electric circuit diagram and FIG. 2 being a perspective view of the external appearance. In the figure, the 7+ body case is fitted into an opening made in the front panel (1s) of the f21H body case il+, which is a main body case attached to the dash board of an automobile (not shown). , number 10
This is a touch button made of a conductive rubber material with a resistance of 1.5 Ω, and is pressed by a passenger with his/her finger (F) when getting out of the car. A cylindrical projection (21) made of an insulating material is provided on the back surface of the touch button (2). (3) and (4)
is a display board that indicates that static electricity has been discharged or that there is no charge.The display board (3) has the words "Not charged," and the display board (4) indicates "No charge." The words "Discharged" are printed on each. +61 and (6) are indicator lights that light up to indicate the discharge state of static electricity, and together with the above-mentioned display boards (31 and (41), constitute a discharge display means. In the example, an iLED (% light diode) is used, and when the indicator light (6) lights up, the indicator board (
3) indicates that there is no charge, and the indicator light (6)
When 1 lights up, the display board (4) indicates that the charged battery has been discharged. (8) Hatouch button (2)
A discharge means that instantly discharges static electricity when a finger (F) touches the (8a) t! It is a normally open switch responsive to a touch button (2), and one contact is connected to a power supply voltage VCC (for example, 5V), and the other contact is connected to a differentiation circuit QOI, which will be described later. (8b) is a movable contact of a spring-biased normally open switch (8m), and when the touch button (2) is pressed, the movable contact (8b) responds to the protrusion (2a) to open the normally open switch. It returns when the switch (8a) is closed and the touch button (21 to finger (F) t Al [1υ is the capacitor (10a)
and a register (10b), and when the normally open switch (8a) is closed and the power supply voltage VCC is supplied, a trigger pulse is given to the timer (Ill).

Then, this timer (lli H%) is activated based on the above trigger pulse, and in this embodiment, the i, rJ level signals are transmitted from time t1 (Q, 1 sec) to t2 (4-1 sec).
c) It is set to be output for a period of 4 seconds. (8c) is an electrolytic capacitor whose capacitance is larger than that of the human body; one end is connected to the touch button (2), the other end is grounded, and the finger (F) is connected to the touch button (2). When you touch it, it instantly absorbs static electricity. (8d) is a resistor whose one end is connected to the capacitor (8C), which together with the resistor (8e) described later discharges the static electricity charged in the capacitor (8c). r
t- constitutes. (8e) has one end as a register (
8d) and the other end is grounded.
The t pressure is divided by a register (8d) to lower the level. (9) is a discharge detection means that detects that static electricity is discharged and outputs a detection signal, and is connected to the discharge means (8) via an AC coupling capacitor (91) to remove the DC component. It is connected. (9b) and (9c) tri are intermediate potential setting resistors connected in series between the power supply voltage VCC and ground, respectively. In this embodiment, VCC is divided into 1/2, and the human body This makes it possible to detect both positive and negative static electricity. (9d)-(9e) and (9f) are basic potential setting registers connected in series between the power supply voltage Vcc and the ground, respectively;
2A of Vcc is applied as a comparison potential Vrl to the negative terminal of a comparator (9g), which will be described later, and 1/3 of Vcc is applied as a comparison potential Vr.
2 is given to the positive terminal of a comparator (9b) to be described later, and sets an upper limit value and a lower value for detecting static electricity. (9g) and (9h) are comparators that compare the static electricity discharge voltage and the reference voltage, and positive static electricity is the reference potential Vrx k of the comparator (9g).
When it exceeds the rJ level, the comparator (9g) can no longer output the rJ level. Further, when the negative static electricity falls below the reference X position Vr21 of the comparator (9h), the rJ level is output from the comparator (9h). (9I) is an OR circuit that calculates the logical sum of the comparators (9g) and (9b), and is a comparator (9g).

(9h) When one of the outputs is at rHJ level, “H
'' level is output as a detection signal to a differentiating circuit 0 and an RS flip 70, which will be described later. α is a differentiating circuit consisting of a capacitor (12m) and a resistor (12b), and when an rJ level signal is output from the OR circuit (pulling), a trigger pulse is sent to the timer 031 after a predetermined time “a” (4.1 secC). Then, timer α1
For example, it operates based on the trigger pulse, and in this embodiment, a signal at the ruJ level is transmitted for a time t s (4, 1 sec
) to after t4 (4-5 sec), that is, 0.4
It is set to output for seconds. (14) is R57
It is a 1J round flop, and the rH of the above OR circuit (9I)
It is set by the J level signal and reset by the "H" level signal from timer 03). And the output terminal QK of this RS flip 70 tube α4 is "H"
A buffer that amplifies the level output (IQ is the output terminal Q
K is connected to a buffer aη via an AND circuit n, which will be described later. Q51 is an AND circuit that takes the logical product of the output of the RS flip-flop (141) and the output of the timer (111), and the rHJ level is output from the output terminal Q of the R57 lip (14), While the high level signal is being output for a preset 4 seconds, the "H" level is output.

Also, when the output of the output terminal Q is at the "L" level and the output of the timer (111 is at the "H" level), a signal at the "L" level is output.The indicator lamps (6) and (6) is arranged in the main body case (1), one end of the indicator light (6) is connected to the buffer Q-, the other end is grounded via the resistor (18), and the output terminal of the R37 lip 70 tube α4 is Lights up when raJ level is output from Q.

One end of the indicator light (6) is connected to the buffer a, the other end is grounded through the register a, and the above-mentioned AND circuit (O lights up when an "H" level is output from the register a). Next, the operation will be explained. When getting out of the car, the occupant of the car can check whether there is static electricity by pressing the touch button (2) with his finger (F). First,
If the human body is not electrically charged when the touch button (2) is touched with a finger (F), static electricity is not discharged and therefore discharge current is not led to the discharge means (8). ) will not output a detection signal. In this case, since the terminal S of the RS flip-prop 04) is at the "L" level, the output terminal Q 4 is kept at the rLJ level. An inverted output "H" level is outputted from the AND circuit 0Is). In addition, since the normally open switch (8 days) is closed by pressing the touch button (2), the differential circuit alK
The t source voltage VCC is supplied and a trigger pulse is output. Then, the timer αω operates and outputs an “H” level signal for 4.4 seconds, which is applied to the AND circuit vl&(II51. Therefore, the AND circuit α0 has the RS flip 70 knob I and the timer (11). Since the "H" level signal is input, the "H" level output is amplified and then supplied to the indicator light (5).As a result, the indicator light (6) lights up and the display board ( 3) The text "Not charged" is displayed.

Next, when the touch button (2) is touched with the finger (F) - if the human body is charged, this static electricity is led to the large capacity capacitor (8c) and is instantly charged.

After that, the static electricity becomes a discharge path through the resistors (8d) and (8).
e) f: is discharged through f: and the level-down discharge voltage is applied to the discharge detection means (9). Furthermore, the discharge voltage is set in a register (9b) for setting an intermediate potential.

The level is adjusted by (9c) and the comparator (9g
) e (9b) respectively. At this time, when the static electricity is positive, the base potential V of the comparator (9g)
When rl'c exceeds, the comparator (9g) outputs "H".
A level signal is output. On the other hand, when the static electricity is negative and falls below the reference potential Vr2f of the comparator (9h), a signal at the "H" level is output from the comparator (9h). Therefore, the input of the OR circuit (91) becomes rHJ level in either case, and the output of rl(J level is given to the terminal S of the differential circuit (I21 and RS flip 70 tube G4. The output is r
After reaching the aJ level and being amplified, it is given to the indicator light (61).As a result, the indicator light (6) lights up, and the message on the display board (4) says "It was charged but has discharged. " is displayed.

By the way, when an "H" level output is given to the differentiator circuit (12), the predetermined time ts (4-1s @
c) When 4.1 seconds have elapsed since the finger (F) touched the touch button (2), a trigger pulse is output from the timer αj and the "H" level signal is 0.4 seconds.
70 rips of R37 (applied to terminal R of 141).

Therefore, since the R37 lip is reset to 70 fl (+41 fl), the output of the output terminal Q becomes "L" level and the indicator light (6) goes out. In other words, this indicator light (61 continues to light for about 4 to 5 seconds after being lit). Therefore, the characters on the display board (4) can be read sufficiently.
! When the terminal S of the J-tube 70-tube H is at the "H" level, the output of the output terminal is at the rJ level, so the output of the AND circuit (I5) is also kept at the rJ level, and the indicator light (5) never lights up.

As described above, in this embodiment, when the occupant of the car presses the touch button (21) with his finger (F) when getting out of the car,
When the human body is charged with static electricity, it is instantly discharged by the discharge means (8)K, and rHJ of the discharge detection means (9)
The indicator light (6) lights up based on the level output, and the indicator board (
41 characters are displayed. - On the other hand, if the human body is not charged, the indicator light (5) lights up based on the "L" level output of the discharge detection means (9), and the display board (3)
The characters are now displayed. Therefore, even if the occupant is charged when getting off the vehicle, it is discharged by touching the touch button (2), so the problem of the occupant feeling an unpleasant shock when getting off the vehicle is solved. In addition, the display board (3
) and (4), it is possible to immediately know that there is no charge, or that the charge has been discharged, and the user can get off the vehicle with peace of mind without feeling anxious when getting off the vehicle. Furthermore, since the indicator light (6) and +61 d go out after a few seconds, there are excellent effects such as being able to prepare for the next charging check.

In addition, in the above embodiment, the indicator light (6) is used as the discharge means.
Although this is used, it may also be indicated by a sound such as a buzzer.

〔Effect of the invention〕

As described above, according to the present invention, the discharge display means displays that static electricity has been discharged based on the detection signal of the discharge detection means, so that the user cannot confirm that static electricity has been discharged. It has the excellent effect of being able to

[Brief explanation of drawings]

FIG. 1 and FIG. 2 show one embodiment of the present invention.
The figure is an electric circuit diagram, and FIG. 2 is a perspective view of the exterior. In the figure, 12+[touch button, (6) is the indicator light (
(discharge display means), +81 is a discharge means, and (9) is a discharge detection means. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A discharge means for discharging static electricity, a discharge detection means for detecting that the discharge means has discharged static electricity and outputting a detection signal, and a discharge display means for indicating that static electricity has been discharged based on the detection signal of the discharge detection means. Electrostatic discharge display device with.