JPS647436Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a self-holding indicator lamp in which the lamp itself has a self-holding function.

Conventionally, incandescent lamps and LEDs (light emitting diodes) have been used as indicator lamps, but since the human eye is relied on to confirm whether the indicator lamps are lit, it is easy to overlook short-term lighting. In some cases, it may not be possible to check the displayed items, and when used for alarm display, etc., it may be difficult to detect the occurrence of a malfunction.

Therefore, in order to be able to judge which items are lit, recorders are sometimes inserted, but only a few items can be viewed at once, and inserting a recorder is time-consuming and causes additional problems. Because there was no regularity in the frequency, it took a lot of time to manage the recorders, and it ended up taking a lot of time to discover the failure, which caused great anxiety to the supervisor.

For this reason, some indicator lamps are equipped with a self-holding function, but these are of a type in which a self-holding circuit is built into the socket to which the indicator lamp is attached.

However, if a self-holding circuit is built in in advance so that all display devices have a self-holding function, the disadvantage is that the space becomes large, and this also leads to an increase in failures and an increase in costs.

The purpose of the present invention is to provide a self-holding indicator lamp that solves the above-mentioned problems by providing the indicator lamp itself with a self-holding function, and furthermore, allows the operation display and the self-holding display to be displayed separately. It is.

Examples of the present invention will be described below. 1st
The figure shows the display circuit of one embodiment. 1 is an external earth (+ ground) terminal (first terminal), 2 is a -21V power terminal (second terminal), and 3 is an alarm ground terminal. This is the air terminal (third terminal). A bridge circuit 4 (composed of diodes D1 to D4) is provided between the power supply terminal 2 and the alarm earth terminal 3 to protect the internal circuit in the event that the terminals 2 and 3 are connected incorrectly. It is connected. 4a is a positive terminal of the bridge circuit 4, and 4b is a negative terminal.

Between the external earth terminal 1 and the negative terminal 4b,
A thyristor S forming a self-holding circuit, a current limiting resistor R1, and a blue light emitting diode L1 for self-holding display are connected in series. Further, a current limiting resistor R2 and a reverse current blocking diode D5 are connected in series between the gate of the thyristor S and the positive terminal 4a. Furthermore, a current limiting resistor R3 and a red light emitting diode L2 for displaying an alarm are connected in series between the positive terminal 4a and the negative terminal 4b. The resistor R4 is used to protect the thyristor gate withstand voltage, and the capacitor C is used to prevent malfunction due to noise.

FIG. 2 shows the external appearance of the self-holding indicator lamp A having the circuit configuration described above. Like a normal indicator lamp, it has a guide 5 made of an insulating material at the tip for insertion into the socket side, and has a guide 5 on both sides. Power terminal 2 on the side
and a ground air terminal 3 for alarm are provided, and light emitting diodes L1 and L2 are respectively installed on the opposite side from the guide 5. The above-described circuit is integrally embedded in the interior 6 by resin molding. 7 is a clip constituting the external earth terminal 1;
The clip 1 is drawn out from the interior 6 by a lead line 8.

In the above, the external earth terminal 1 is connected to the earth (+ground) by the clip 7, a voltage of, for example, -21V is applied to the power supply terminal 2, and the alarm earth terminal 3 is an alarm contact that closes when an alarm occurs. (not shown)
connected to the earth via.

When no alarm is generated, the alarm ground air terminal 3 is open to the ground air, and a potential difference of -21V is generated between the external ground air terminal 1 and the power supply terminal 2. However, since the thyristor S is open, the light emitting diode L1 is turned off, and the light emitting diode L2 is also turned off.

When an alarm occurs, the alarm contact (not shown) closes, so a positive potential is applied to the alarm ground terminal 3, and the current flows from there to the diode D4 → the resistor R3.
→ Light emitting diode L2 → Diode D2 → Power terminal 2, and the light emitting diode L2 lights up in red to indicate that an alarm has occurred. Further, the current passing through the diode D4 flows into the gate of the thyristor S through the resistor R2 and the diode D5, and the thyristor S is triggered and turned on. For this reason, external earth terminal 1→thyristor S→
Due to the current flowing from the resistor R1 to the light emitting diode L1, the light emitting diode L1 lights up in blue.
Indicates that it is in a self-holding state.

Then, when the alarm stops generating, the alarm contact opens, so the alarm terminal 3 becomes open, and the light emitting diode L2 stops emitting red light. However, the other light emitting diode L1 continues to light up in blue and continues to display that an alarm was issued in the past.

In addition, the light emitting diode L for this self-holding display
To stop lighting 1, remove clip 7 from the ground.

Further, the bridge circuit 4 is not necessarily necessary, and if it is not used, the power supply terminal 2 is connected to the common connection point of the light emitting diodes L1 and L2,
Further, the alarm ground terminal 3 is connected to the common connection point of the resistors R2 and R3.

As described above, according to the present invention, since the self-holding circuit is built into the indicator lamp, the indicator lamp itself has a self-holding function, and unlike the conventional one, the self-holding circuit is installed on the socket side. There is no need to configure a system or insert a recorder, and instantaneous failure items whose occurrence time is not determined can be easily discovered, making it possible to quickly respond to and eliminate failures of unknown cause. In addition, in addition to the self-holding display, alarms and other operation displays are also used, so when both displays are displayed, it is important to confirm that the alarms and other operations are still ongoing. I can do it. Furthermore, the self-holding indicator lamp of this invention is highly reliable and has a long life due to its non-contact type.
Furthermore, it can be constructed with low power consumption.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a self-holding indicator lamp according to an embodiment of the present invention, and FIG. 2 is a diagram showing the appearance of the self-holding indicator lamp. 1...External earth terminal, 2...Power terminal, 3...
Alarm earth terminal, 4... Bridge circuit, 4a...
Positive terminal, 4b...minus terminal, 5...guide, 6...inside, 7...clip, 8...lead wire.

Claims (1)

[Scope of utility model registration request] A thyristor and a self-holding display LED are connected in series between the first terminal and the second terminal, and the second
An LED for operation indication is placed between the terminal and the third terminal.
and the third terminal is connected to the gate of the thyristor, the first and second terminals are used as power supply terminals, the third terminal is used as an operation signal input terminal, and the thyristor and each of the LEDs are connected. A self-holding indicator lamp characterized by being constructed by integrally recessing.