JP2001167371A - Display circuit for initial sounding prevention time of gas alarm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily confirm the elapse of an initial sounding prevention time up to the stabilization of a gas detecting element. SOLUTION: The initial sounding prevention time T is halved into, for example, former-half T1 and the rest T2 and a pilot lamp is made to illuminate in red for T1 and in green for T2, so that the elapse of the initial sounding prevention time can easily be recognized without using a timer, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit for displaying an initial ringing prevention time of a gas alarm which displays an initial ringing prevention time in two stages by using a two-color light emitting element.

[0002]

2. Description of the Related Art Conventionally, an initial ringing prevention time is displayed by, for example, continuously lighting or continuously blinking a light emitting element. FIG. 4 shows a conventional example of an initial ringing prevention time display circuit of a gas alarm. In the figure, 11 is a commercial power supply, 1
2 is a gas detection circuit, 13 is a display control circuit, 14 is a switch circuit, 15 is a light emitting element, and 16 is a switch. When the light emitting element 15 is continuously lit by this circuit, a signal (output of the display control circuit 13) A supplied to the switch circuit 14 is as shown in FIG. 5, and in the case of continuous blinking, as shown in FIG.
T in FIGS. 5 and 6 indicates an initial ringing prevention time.

[0003]

However, the conventional circuit has the following problems. In other words, in the case of a semiconductor-type gas detection element or the like, the period until this is stabilized, that is, the initial ringing prevention time is from about 60 seconds to 1 for long.
It is up to 80 seconds, and it is difficult to determine the remaining time until the time is up when a gas alarm is installed or the like unless it is checked at any time with a clock or the like. Therefore, an object of the present invention is to make it possible to easily display the remaining time until the initial ringing prevention time elapses without using a clock or the like.

[0004]

In order to solve such a problem, according to the first aspect of the present invention, there is provided a display means for displaying that the initial sounding prevention time of the gas detection means is being provided, and the display means is started from a power-on time. Display control means for dividing the initial ringing prevention time into a first half and a remaining second half, and changing and displaying the display colors of the two-color light emitting elements in the first half and the second half.

According to the first aspect of the invention, the first half and the second half of the initial ringing prevention time can be continuously lit (the second aspect of the invention), or the first half and the second half of the initial ringing prevention time can be continuously blinked. (The invention of claim 3),
Alternatively, a combination of continuous lighting and continuous blinking in the first half and the second half of the initial ringing prevention time can be employed (the invention of claim 4). Alternatively, the first half of the initial ringing prevention time,
The cycle of the continuous blinking can be different from the latter half (the invention of claim 5).

[0006]

FIG. 1 is a block diagram showing an embodiment of the present invention. 1 is a commercial power supply, 2 is a gas detection circuit composed of a gas detection element and a resistor, and its gas detection signal is input to a display control circuit 3. The display control circuit 3 constitutes an initial ringing prevention time display circuit according to the present invention, and is, for example, as shown in FIGS. 2 and 3 from when the power is turned on when the switch 7 is turned on until a predetermined initial ringing prevention time elapses. After the initial ringing prevention time has elapsed, the gas detection output from the gas detection circuit 2 is monitored.
When the gas detection circuit 2 detects gas, it outputs a gas leak detection signal to gas leak alarm means (not shown). The gas leak alarm means issues an alarm by this signal.

Reference numeral 4 denotes a two-color light-emitting element, and a switch element is a switch element. The switch elements 5 and 6 operate according to signals A and B from the display control circuit 3 to drive the two-color light-emitting element 4. , The internal light emitting elements 4a, 4a in response to the signals A, B.
b is caused to emit light. 2 and 3 show time operation characteristic diagrams of the output signals A and B of the display control circuit 3, and show the initial ringing prevention time T.
Here, an example is shown in which the first half is divided into the first half T1 and the second half remaining time T2, but the time distribution may be 2: 1 instead of the equal division.

In the case of FIG. 2, if T = 60 seconds, T1, T
2 is 30 seconds each, and at the time of the continuous signal of T1, the 4a (for example, red) side of the two-color light emitting element 4 is continuously lit,
At the time of the continuous signal of T2, the recognition can be facilitated by setting the 4b (for example, green) side of the two-color light emitting element 4 to a continuous lighting state. FIG. 3 shows an example in which the signals A and B are intermittent signals. For example, at T1, the 4a side blinks, and at T2, the 4b side blinks.

Although not shown, continuous lighting and blinking are combined at, for example, T1 and T2 within the initial ringing prevention time T. For example, continuous lighting (continuous blinking) is performed at T1 and continuous blinking is performed at T2. (Continuous lighting), or the blinking periods may be changed from one another.

[0010]

According to the present invention, the display mode of the two-color light-emitting element (continuous lighting, continuous lighting,
By making the continuous blinking, the combination of the continuous lighting and the continuous blinking, and the blinking cycle) different, the advantage that the elapse of the initial ringing prevention time can be easily confirmed can be obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a waveform chart showing an example of output signals of the display control circuit shown in FIG.

FIG. 3 is a waveform chart showing another example of output signals of the display control circuit shown in FIG.

FIG. 4 is a circuit diagram showing a conventional example.

5 is a waveform chart showing an example of an output signal of the display control circuit shown in FIG.

FIG. 6 is a waveform chart showing another example of output signals of the display control circuit shown in FIG. 4;

[Explanation of symbols]

1. Commercial power supply 2. Gas detection circuit 3. Display control circuit
4 ... two-color light emitting element, 4a, 4b ... internal light emitting element, 5,
6 switch element, 7 switch.

Claims (5)

[Claims] 1. A display means for displaying that the initial sounding prevention time of the gas detection means is in progress, and the initial sounding prevention time started from the time of turning on the power is bisected into a first half and a remaining second half. A display control means for changing the display color of the two-color light-emitting element between the second half and the second half. 2. The initial sound prevention time display circuit for a gas alarm according to claim 1, wherein the first half and the second half of the initial sound prevention time are continuously lit. 3. The circuit according to claim 1, wherein both the first half and the second half of the initial sound prevention time are blinked continuously. 4. The circuit according to claim 1, wherein the first half and the second half of the initial ring prevention time are a combination of continuous lighting and continuous flashing. 5. The circuit for displaying an initial sound prevention time of a gas alarm according to claim 1, wherein the period of continuous blinking is different from each other in the first half and the second half of the initial sound prevention time.